CN107643419B - High-speed air cannon projectile launching speed capturing instrument and method thereof - Google Patents
High-speed air cannon projectile launching speed capturing instrument and method thereof Download PDFInfo
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- CN107643419B CN107643419B CN201711020710.0A CN201711020710A CN107643419B CN 107643419 B CN107643419 B CN 107643419B CN 201711020710 A CN201711020710 A CN 201711020710A CN 107643419 B CN107643419 B CN 107643419B
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Abstract
The invention discloses a high-speed air cannon projectile firing speed catching instrument, which comprises a projectile catching pipe, a catching pipe front bracket, a catching pipe rear bracket, a front hydraulic lifting column, a rear hydraulic lifting column, a front seat and a rear seat, wherein the front seat is connected with the front seat; the upper ends of the front support of the catching tube and the rear support of the catching tube are respectively connected with the lower wall of the catching tube in a front-rear hinged manner through a first hinge piece and a second hinge piece; the lower ends of the front support and the rear support of the capturing tube are respectively and fixedly connected with the upper ends of the front hydraulic lifting column and the rear hydraulic lifting column which are vertically arranged; the front hydraulic lifting column and the rear hydraulic lifting column are respectively arranged on the front seat and the rear seat; the invention has simple structure, adopts the gesture-adjustable projectile capturing tube, can be correspondingly adjusted at any time according to the change of the firing angle of the gun tube, and ensures that the projectile catcher can adapt to various firing angles of the air gun.
Description
Technical Field
The invention belongs to the field of speed measurement, and particularly relates to a high-speed air cannon projectile launching speed capturing instrument and a method thereof.
Background
At present, air cannon experiments are commonly adopted at home and abroad to simulate the processes of launching, movement, collision and the like of high-speed equipment. The accurate measurement of the speed of the air cannon before collision of the high-speed projectile is the guarantee of experimental repeatability and acquisition of relevant parameters and stability performance analysis after collision, and is directly related to the reliability of experimental results.
In the prior art, a contact target is widely adopted, and a contact target scheme is adopted, and the method is characterized in that a truly existing target surface is required to be fixed on a trajectory, a signal is generated when a projectile passes through the target surface, and an oscilloscope is used for recording jump time and calculating speed. The scheme has simple principle and structure, but has the defects of measurement accuracy and measurement range.
Disclosure of Invention
The invention aims to: in order to overcome the defects in the prior art, the invention provides a high-speed air cannon projectile launching speed capturing instrument and a method thereof.
The technical scheme is as follows: in order to achieve the above purpose, the invention provides a high-speed air cannon projectile firing speed catching instrument, which comprises a projectile catching pipe, a catching pipe front bracket, a catching pipe rear bracket, a front hydraulic lifting column, a rear hydraulic lifting column, a front seat and a rear seat;
the upper ends of the front support of the catching tube and the rear support of the catching tube are respectively connected with the lower wall of the catching tube in a front-rear hinged manner through a first hinge piece and a second hinge piece; the lower ends of the front support and the rear support of the capturing tube are respectively and fixedly connected with the upper ends of the front hydraulic lifting column and the rear hydraulic lifting column which are vertically arranged; the front hydraulic lifting column and the rear hydraulic lifting column are respectively arranged on the front seat and the rear seat.
Further, the device also comprises a front sliding block, a rear sliding block, a front screw rod, a rear screw rod, a first guide post, a front supporting seat, a rear supporting seat, a front screw rod motor, a rear screw rod motor, a base and a second guide post;
the lower ends of the front seat and the rear seat are respectively fixedly connected with the front sliding block and the rear sliding block; the front support seat and the rear support seat are respectively and symmetrically arranged on two sides of the table top of the base, the front screw motor and the rear screw motor are respectively arranged on the table top of the front support seat and the table top of the rear support seat, and the front screw motor and the rear screw motor are respectively in driving connection with the front screw and the rear screw, wherein the front screw and the rear screw are positioned between the front screw motor and the rear screw motor and are coaxially arranged; the front screw rod and the rear screw rod are respectively in threaded connection with threaded through holes on the front sliding block and the rear sliding block; the first guide posts which are transversely and fixedly arranged simultaneously movably penetrate into guide holes on the front sliding block and the rear sliding block; the front screw rod and the rear screw rod can respectively drive the front sliding block and the rear sliding block to move along the first guide post.
One end of the second guide post is coaxially and fixedly connected with the tail end of the rear screw rod; the tail end of the front screw rod is coaxially provided with a guide hole; the other end of the second guide post can be movably inserted into the guide hole on the front screw rod.
Further, the device also comprises an air cannon launching tube; the air cannon launching tube can launch air cannon shots; the projectile capturing tube is positioned at the transmitting port of the air cannon transmitting tube; the bullet catching tube can be adjusted to have the same axis with the trajectory of the air cannon launching tube.
Further, the upper wall of the speed measuring trajectory of the projectile capturing tube is provided with two detection holes at intervals along the axial direction, the detection parts in the detection holes comprise an ultraviolet light emission head and a visible optical fiber probe target, a partition plate is arranged between the ultraviolet light emission head and the visible optical fiber probe target, and the emission direction of the ultraviolet light emission head is inclined towards the side of the visible optical fiber probe target.
Further, the projectile speed measuring unit comprises an ultraviolet excitation module, an ultraviolet light guide fiber, a host, a front optical cable and a rear optical cable; the host comprises a photoelectric conversion unit; visible optical fibers are arranged in the front optical cable and the rear optical cable;
the ultraviolet light leading-out end of the ultraviolet light excitation module is connected with the ultraviolet light leading-in end of the ultraviolet light guide fiber; the ultraviolet light leading-out end of the ultraviolet light guide fiber is connected with the ultraviolet light leading-in end of the ultraviolet light emitting head;
the visible light output end of the visible optical fiber probe target is connected with the visible light input end of the visible optical fiber; the visible light output end of the visible light guide fiber is connected with the visible light capturing end of the photoelectric conversion unit in the host.
Further, the host also comprises a data processing unit, wherein the data processing unit comprises a timer, a microprocessor and a memory; the data processing unit takes a microprocessor as a center, the timer and the memory are respectively connected with the signal transmission of the microprocessor, and the signal input end of the microprocessor is connected with the signal output end of each photoelectric conversion unit.
Further, the host also comprises a display and a control key, wherein the signal input end of the display is connected with the signal output end of the microprocessor; the control key is arranged below the display.
Further, the air cannon ball comprises an air cannon ball, a circle of fluorescent dye groove is arranged in the middle of the ball body of the air cannon ball, the air cannon ball further comprises an O-shaped elastic fluorescent dye belt, ultraviolet fluorescent dye can be adhered to the elastic fluorescent dye belt, the elastic fluorescent dye belt is tightly sleeved in the fluorescent dye groove, and the outer diameter of the elastic fluorescent dye belt in the sleeved state is smaller than the diameter of the main body of the air cannon ball.
Further, a method of a high-speed air cannon projectile firing speed catcher is characterized in that:
the method comprises the following specific steps:
step 1: determining the relative distance between the two detection holes along the axis direction of the velocity measuring trajectory, and simultaneously and continuously introducing ultraviolet light to the two ultraviolet light guide fibers by the two ultraviolet light excitation modules, so that the two ultraviolet light emitting heads respectively and continuously introduce ultraviolet light into the two detection holes;
step 2: the air cannon pellets launched from the air cannon pellet launcher enter the trajectory of the pellet catch tube and move at high speed along the trajectory;
step 3: when the elastic fluorescent dye band on the air cannon ball passes through the first detection hole, ultraviolet light led out by the ultraviolet light emitting head in the first detection hole is captured by the elastic fluorescent dye band, then the elastic fluorescent dye band generates fluorescent reaction, the elastic fluorescent dye band instantly releases visible light, the visible light generated by the elastic fluorescent dye band is captured by the visible optical fiber probe target in the first detection hole, the captured visible light is transmitted to the photoelectric conversion unit in the host through the visible optical fiber in the rear optical cable, the photoelectric conversion unit transmits an electric signal to the pulse generator, and then the pulse generator starts the signal to the timer;
step 4: when the elastic fluorescent dye band on the air cannon ball passes through the second detection hole, ultraviolet light led out by the ultraviolet light emitting head in the second detection hole is captured by the elastic fluorescent dye band, then the elastic fluorescent dye band generates fluorescent reaction, the elastic fluorescent dye band instantaneously releases visible light again, the visible light generated by the elastic fluorescent dye band is captured by the visible optical fiber probe target in the second detection hole, the captured visible light is transmitted to the photoelectric conversion unit in the host through the visible optical fiber in the front optical cable, the photoelectric conversion unit transmits an electric signal to the pulse generator, and then the pulse generator gives a signal to the timer;
step 5: the time meter transmits the time difference data to the microprocessor, the microprocessor divides the relative distance between the two detection holes along the axis direction of the velocity measurement trajectory by the time difference between the first detection hole and the second detection hole in the way of the elastic fluorescent dye band in turn to calculate the average velocity of the air cannon projectile, and finally the microprocessor transmits the obtained data to the display and the memory.
The beneficial effects are that: the invention has simple structure, adopts the gesture-adjustable projectile capturing tube, can be correspondingly adjusted at any time according to the change of the firing angle of the projectile tube, ensures that the projectile catcher can adapt to various firing angles of an air cannon, adopts the mode of capturing fluorescent response signals by adopting an optical fiber probe target to be superior to the common light target type speed measuring mode in stability and accuracy, and further can greatly shorten the distance between two detection holes due to the fact that the width of an elastic fluorescent dye belt can be controlled in theory, improves the accuracy of instantaneous speed measurement, overcomes the defects of a contact type measuring method in measuring range and accuracy, and is higher than a coil target scheme in anti-interference performance and stability. The following are synthesized: the device and the method have the advantages of simple structure, non-contact, high sensitivity, strong anti-interference performance, high measuring range and the like.
Drawings
FIG. 1 is a first schematic view of the overall structure of the present invention;
FIG. 2 is a second schematic diagram of the overall structure of the present invention;
FIG. 3 is a schematic view of a first partial structure of the projectile trapping tube;
FIG. 4 is a schematic view of a second partial structure of the projectile trapping tube;
FIG. 5 is a schematic view of a third partial structure of the projectile trapping tube;
FIG. 6 is a schematic view of the internal structure of the projectile trapping tube;
FIG. 7 is a schematic view of the structure of the detecting unit in the detecting hole;
FIG. 8 is a schematic diagram of the structure of an air cannon projectile.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 and 2, a high-speed air cannon projectile firing rate capturing apparatus is characterized in that: comprises a projectile capturing tube 2, a capturing tube front bracket 227, a capturing tube rear bracket 225, a front hydraulic lifting column 201, a rear hydraulic lifting column 226, a front seat 202 and a rear seat 223; the projectile capturing tube 2 is provided with a projectile velocity measuring unit 231, and the upper ends of the capturing tube front bracket 227 and the capturing tube rear bracket 225 are respectively connected to the lower wall of the projectile capturing tube 2 in a front-back hinged manner through a first hinge 228 and a second hinge 229; the lower ends of the capturing tube front bracket 227 and the capturing tube rear bracket 225 are respectively and fixedly connected with the upper ends of the front hydraulic lifting column 201 and the rear hydraulic lifting column 226 which are vertically arranged; the front hydraulic lifting column 201 and the rear hydraulic lifting column 226 are respectively arranged on the front seat 202 and the rear seat 223; the device also comprises a front sliding block 226, a rear sliding block 220, a front screw rod 205, a rear screw rod 221, a first guide pillar 209, a front supporting seat 203, a rear supporting seat 222, a front screw rod motor 204, a rear screw rod motor 224, a base 208 and a second guide pillar 207; the lower ends of the front seat 202 and the rear seat 223 are respectively fixedly connected with the front sliding block 226 and the rear sliding block 220; the front support seat 203 and the rear support seat 222 are respectively and symmetrically arranged at two sides of the table top of the base 208, the front screw motor 204 and the rear screw motor 224 are respectively arranged at the table top of the front support seat 203 and the rear support seat 222, the front screw motor 204 and the rear screw motor 224 are respectively in driving connection with the front screw 205 and the rear screw 221, wherein the front screw 205 and the rear screw 221 are positioned between the front screw motor 204 and the rear screw motor 224 and are coaxially arranged; the front screw rod 205 and the rear screw rod 221 are respectively in threaded connection with threaded through holes on the front slider 226 and the rear slider 220; the first guide post 209, which is fixedly arranged transversely, is movably inserted into the guide holes on the front slider 226 and the rear slider 220 at the same time; the front screw rod 205 and the rear screw rod 221 can respectively drive the front sliding block 226 and the rear sliding block 220 to displace along the first guide pillar 209; the two lead screw motors are matched with the two lifting rods, so that the posture of the shot catching tube is adjusted, the shot catching tube can be correspondingly adjusted at any time according to the change of the firing angle of the gun tube, and the shot catcher is ensured to be suitable for various firing angles of the air gun.
One end of the second guide post 207 is coaxially and fixedly connected with the tail end of the rear screw rod 221; the tail end of the front screw rod 205 is coaxially provided with a guide hole; the other end of the second guide post 207 is movably inserted into a guide hole on the front screw 205. Also comprises an air cannon launching tube 11; the air cannon launching tube 11 can launch air cannon shots; the projectile capturing tube 2 is positioned at the transmitting port of the air cannon transmitting tube 11; the bullet catching tube 2 can be adjusted to the position that the bullet catching tube 2 and the trajectory of the air cannon launching tube 11 are coaxial, in the embodiment, the diameter of the trajectory of the air cannon launching tube 11 is smaller than that of the bullet catching tube 2, and the second guide pillar 207 ensures that no deviation occurs in the adjusting process, so that the adjusting precision is improved.
As shown in fig. 3 to 8, the upper wall of the velocity measuring trajectory 62 of the projectile capturing tube 2 is provided with two detection holes 43 at intervals along the axial direction, the detection component 63 in each detection hole 43 comprises an ultraviolet light emitting head 58 and a visible optical fiber probe target 60, and a partition plate 105 is arranged between the ultraviolet light emitting head 58 and the visible optical fiber probe target 60, wherein the emitting direction of the ultraviolet light emitting head 58 is inclined towards the side of the visible optical fiber probe target 60, and when an air projectile just passes through, the ultraviolet light emitted by the ultraviolet light emitting head 58 is projected to the fluorescent dye opposite to the visible optical fiber probe target 60, so that the visible light generated after the fluorescent reaction of the fluorescent dye is sufficiently captured by the visible optical fiber probe target 60, and the leakage is prevented.
The projectile velocity measurement unit 231 comprises an ultraviolet excitation module 54, an ultraviolet light guide fiber 55, a host machine 5, a front optical cable 3 and a rear optical cable 4; the host 5 comprises a photoelectric conversion unit; the front optical cable 3 and the rear optical cable 4 are internally provided with visible optical fibers 59; the ultraviolet light leading-out end of the ultraviolet light excitation module 54 is connected with the ultraviolet light leading-in end 56 of the ultraviolet light guide fiber 55; the ultraviolet light leading-out end 57 of the ultraviolet light guide fiber 55 is connected with the ultraviolet light leading-in end of the ultraviolet light emitting head 58; in this embodiment, the uv light guide fiber 59 is a quartz fiber, and the quartz fiber has a wide transmission wavelength range (from near uv to near ir, and from 0.3 to 2.1 um), so that the quartz fiber is suitable for transmitting uv wavelength signals, and has the advantages of large numerical aperture, large fiber core diameter, high mechanical strength, good bending property, and easy coupling with a light source;
the visible light output end of the visible optical fiber probe target 60 is connected with the visible light input end of the visible optical fiber 59; the visible light output end of the visible light guide fiber 59 is connected with the visible light capturing end of the photoelectric conversion unit in the host 5; the host 5 also comprises a data processing unit, wherein the data processing unit comprises a timer, a microprocessor and a memory; the data processing unit takes a microprocessor as a center, the timer and the memory are respectively connected with the signal transmission of the microprocessor, and the signal input end of the microprocessor is connected with the signal output end of each photoelectric conversion unit.
The host 5 also comprises a display 6 and a control key 7, wherein the signal input end of the display 6 is connected with the signal output end of the microprocessor; the control keys 7 are arranged below the display 6.
The device comprises an air cannon ball, a ring of fluorescent dye groove 32 is arranged in the middle of the bullet body of the air cannon ball, and an O-shaped elastic fluorescent dye belt 31 is further arranged, wherein the elastic fluorescent dye belt 31 can be adhered with ultraviolet fluorescent dye, when a certain normal-temperature substance is irradiated by incident light with a certain wavelength (usually ultraviolet wave band), the light energy is absorbed, the air cannon ball enters an excited state, and immediately de-excites and emits emergent light with a wavelength longer than that of the incident light (usually the wavelength is in a visible wave band); when a part of the fluorescent material stops incident light, the light emission phenomenon disappears immediately, and the emitted light having such a property is called fluorescence.
The elastic fluorescent dye belt 31 is tightly sleeved in the fluorescent dye groove 32, and the outer diameter of the elastic fluorescent dye belt 31 in the sleeved state is smaller than the diameter of the air cannon ball main body; the elastic fluorescent dye band 31 can be effectively prevented from contacting the inner wall of the trajectory, the phenomenon that the elastic fluorescent dye band is worn when the elastic fluorescent dye band does not reach the fluorescent reaction point is avoided, and meanwhile, the interference of visible light side leakage generated by the fluorescent reaction on detection can be prevented; because the width of the elastic fluorescent dye band 31 can be controlled very narrow, the distance between the two detection holes 43 can be greatly shortened, and the accuracy of instantaneous speed measurement can be improved.
As shown in fig. 1 to 8, a method for capturing the firing speed of high-speed air cannon pellets comprises the following specific steps:
step 1: determining the relative distance between the two detection holes 43 along the axis direction of the velocity measurement trajectory 62, and continuously introducing ultraviolet light to the two ultraviolet light guide fibers 55 by the two ultraviolet light excitation modules 54 at the same time, so that the two ultraviolet light emitting heads 58 continuously introduce ultraviolet light into the two detection holes 43 respectively;
step 2: the air cannon pellets ejected from the air cannon pellet ejection cylinder 11 enter the trajectory of the pellet catch pipe 2 and move at a high speed along the trajectory;
step 3: when the elastic fluorescent dye belt 31 on the air cannon ball passes through the first detection hole 43, the ultraviolet light guided by the ultraviolet light emitting head 58 in the first detection hole 43 is captured by the elastic fluorescent dye belt 31, then the elastic fluorescent dye belt 31 generates fluorescent reaction, the elastic fluorescent dye belt 31 instantly releases visible light, the visible light generated by the elastic fluorescent dye belt 31 is captured by the visible optical fiber probe target 60 in the first detection hole 43, the captured visible light is transmitted to the photoelectric conversion unit in the host 5 through the visible optical fiber 59 in the rear optical cable 4, the photoelectric conversion unit transmits an electric signal to the pulse generator, and then the pulse generator starts the signal to the timer;
step 4: when the elastic fluorescent dye belt 31 on the air cannon projectile passes through the second detection hole 43, the ultraviolet light guided by the ultraviolet light emitting head 58 in the second detection hole 43 is captured by the elastic fluorescent dye belt 31, then the elastic fluorescent dye belt 31 generates fluorescent reaction, the elastic fluorescent dye belt 31 instantaneously releases visible light again, the visible light generated by the elastic fluorescent dye belt 31 is captured by the visible optical fiber probe target 60 in the second detection hole 43, the captured visible light is transmitted to the photoelectric conversion unit in the host 5 through the visible optical fiber 59 in the front optical cable 3, the photoelectric conversion unit transmits an electric signal to the pulse generator, and then the pulse generator gives a signal to the timer;
step 5: the time meter transmits the time difference data to the microprocessor, the microprocessor divides the relative distance between the two detection holes 43 along the axis direction of the velocity measurement trajectory 62 by the time difference between the first detection hole 43 and the second detection hole 43 in turn by the elastic fluorescent dye band 31 to calculate the average velocity of the air cannon projectile, and finally the microprocessor transmits the obtained data to the display 6 and the memory.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (5)
1. The utility model provides a high-speed air cannon pellet's firing rate catches appearance which characterized in that: comprises a projectile catching tube (2), a catching tube front bracket (227), a catching tube rear bracket (225), a front hydraulic lifting column (201), a rear hydraulic lifting column (226), a front seat (202) and a rear seat (223);
the projectile capturing tube (2) is provided with a projectile velocity measuring unit (231), and the upper ends of the front capturing tube bracket (227) and the rear capturing tube bracket (225) are respectively connected to the lower wall of the projectile capturing tube (2) in a front-back hinged manner through a first hinge (228) and a second hinge (229); the lower ends of the front capturing pipe bracket (227) and the rear capturing pipe bracket (225) are respectively and fixedly connected with the upper ends of the front hydraulic lifting column (201) and the rear hydraulic lifting column (226) which are vertically arranged; the front hydraulic lifting column (201) and the rear hydraulic lifting column (226) are respectively arranged on the front seat (202) and the rear seat (223);
the air cannon also comprises an air cannon launching tube (11); the air cannon launching tube (11) can launch air cannon shots; the projectile capturing tube (2) is positioned at the transmitting port of the air cannon transmitting tube (11); the posture of the projectile capturing tube (2) can be adjusted until the projectile capturing tube (2) is coaxial with the trajectory of the air cannon launching tube (11);
the upper wall of a speed measuring trajectory (62) of the projectile capturing tube (2) is provided with two detection holes (43) at intervals along the axial direction, a detection part (63) in each detection hole (43) comprises an ultraviolet light emission head (58) and a visible optical fiber probe target (60), a partition plate (105) is arranged between the ultraviolet light emission head (58) and the visible optical fiber probe target (60), and the emission direction of the ultraviolet light emission head (58) is inclined towards the side of the visible optical fiber probe target (60);
the projectile speed measuring unit (231) comprises an ultraviolet excitation module (54), an ultraviolet light guide fiber (55), a host (5), a front optical cable (3) and a rear optical cable (4); the host (5) comprises a photoelectric conversion unit; the front optical cable (3) and the rear optical cable (4) are internally provided with visible optical fibers (59);
the ultraviolet light leading-out end of the ultraviolet light excitation module (54) is connected with the ultraviolet light leading-in end (56) of the ultraviolet light guide fiber (55); the ultraviolet light leading-out end (57) of the ultraviolet light guide fiber (55) is connected with the ultraviolet light leading-in end of the ultraviolet light emitting head (58);
the visible light leading-out end of the visible optical fiber probe target (60) is connected with the visible light leading-in end of the visible optical fiber (59); the visible light output end of the visible light guide fiber (59) is connected with the visible light capturing end of the photoelectric conversion unit in the host (5);
the air cannon ball is characterized in that a circle of fluorescent dye groove (32) is arranged in the middle of the bullet body of the air cannon ball, the air cannon ball also comprises an O-shaped elastic fluorescent dye belt (31), ultraviolet fluorescent dye can be adhered to the elastic fluorescent dye belt (31), the elastic fluorescent dye belt (31) is tightly sleeved in the fluorescent dye groove (32), and the outer diameter of the elastic fluorescent dye belt (31) in the sleeved state is smaller than the diameter of the air cannon ball body.
2. A high velocity air cannon projectile firing rate capturing apparatus as claimed in claim 1 wherein: further comprises: a front slider (206), a rear slider (220), a front screw (205), a rear screw (221), a first guide post (209), a front support seat (203), a rear support seat (222), a front screw motor (204), a rear screw motor (224), a base (208) and a second guide post (207);
the lower ends of the front seat (202) and the rear seat (223) are respectively fixedly connected with the front sliding block (206) and the rear sliding block (220); the front support seat (203) and the rear support seat (222) are respectively and symmetrically arranged on two sides of the table top of the base (208), the front screw motor (204) and the rear screw motor (224) are respectively arranged on the table top of the front support seat (203) and the rear support seat (222), the front screw motor (204) and the rear screw motor (224) are respectively in driving connection with the front screw (205) and the rear screw (221), and the front screw (205) and the rear screw (221) are positioned between the front screw motor (204) and the rear screw motor (224) and are coaxially arranged; the front screw rod (205) and the rear screw rod (221) are respectively in threaded connection with threaded through holes on the front sliding block (206) and the rear sliding block (220); the first guide post (209) which is transversely and fixedly arranged is movably penetrated into guide holes on the front sliding block (206) and the rear sliding block (220) at the same time; the front screw rod (205) and the rear screw rod (221) can respectively drive the front sliding block (206) and the rear sliding block (220) to displace along the first guide pillar (209);
one end of the second guide post (207) is coaxially and fixedly connected with the tail end of the rear screw rod (221); the tail end of the front screw rod (205) is coaxially provided with a guide hole; the other end of the second guide post (207) can be movably inserted into a guide hole on the front screw rod (205).
3. A high velocity air cannon projectile firing rate capturing apparatus as claimed in claim 2 wherein: the host (5) also comprises a data processing unit, wherein the data processing unit comprises a timer, a microprocessor and a memory; the data processing unit takes a microprocessor as a center, the timer and the memory are respectively connected with the signal transmission of the microprocessor, and the signal input end of the microprocessor is connected with the signal output end of each photoelectric conversion unit.
4. A high velocity air cannon projectile firing rate capturing apparatus in accordance with claim 3 wherein: the host (5) also comprises a display (6) and control keys (7), and the signal input end of the display (6) is connected with the signal output end of the microprocessor; the control key (7) is arranged below the display (6).
5. The method of operating a high velocity air cannon projectile firing rate capturing apparatus of claim 4 wherein:
the method comprises the following specific steps:
step 1: determining the relative distance between the two detection holes (43) along the axial direction of the velocity measuring trajectory (62), and simultaneously and continuously introducing ultraviolet light into the two ultraviolet light guide fibers (55) by the two ultraviolet light excitation modules (54), so that the two ultraviolet light emitting heads (58) respectively and continuously introduce ultraviolet light into the two detection holes (43);
step 2: the air cannon pellets launched from the air cannon launching tube (11) enter the trajectory of the pellet capturing tube (2) and move at high speed along the trajectory;
step 3: when the elastic fluorescent dye belt (31) on the air cannon ball passes through the first detection hole (43), ultraviolet light led out by the ultraviolet light emitting head (58) in the first detection hole (43) is captured by the elastic fluorescent dye belt (31), then the elastic fluorescent dye belt (31) generates fluorescent reaction, the elastic fluorescent dye belt (31) instantly releases visible light, the visible light generated by the elastic fluorescent dye belt (31) is captured by the visible optical fiber probe target (60) in the first detection hole (43), the captured visible light is transmitted to the photoelectric conversion unit in the host (5) through the visible optical fiber (59) in the rear optical cable (4), the photoelectric conversion unit transmits an electric signal to the pulse generator, and then the pulse generator starts the signal to the timer;
step 4: when the elastic fluorescent dye belt (31) on the air cannon ball passes through the second detection hole (43), ultraviolet light led out by the ultraviolet light emitting head (58) in the second detection hole (43) is captured by the elastic fluorescent dye belt (31), then the elastic fluorescent dye belt (31) generates fluorescence reaction, the elastic fluorescent dye belt (31) instantly releases visible light again, the visible light generated by the elastic fluorescent dye belt (31) is captured by the visible optical fiber probe target (60) in the second detection hole (43), the captured visible light is transmitted to the photoelectric conversion unit in the host (5) through the visible optical fiber (59) in the front optical cable (3), the photoelectric conversion unit transmits an electric signal to the pulse generator, and then the pulse generator gives a timer end signal;
step 5: the time meter transmits the time difference data to the microprocessor, the microprocessor divides the relative distance between the two detection holes (43) along the axis direction of the velocity measuring trajectory (62) by the time difference between the first detection hole (43) and the second detection hole (43) in sequence by the elastic fluorescent dye band (31), and finally the microprocessor transmits the obtained data to the display (6) and the memory.
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