CN112201493A - Emergency brake-separating tripping device - Google Patents

Abstract

The invention provides an emergency brake-separating tripping device, and belongs to the technical field of power equipment. It has been solved and has been difficult to the problem of guaranteeing to advance apart from the precision when current separating brake device installs. This urgent separating brake trip gear, including the casing and fix absorption magnet and the driving motor on the casing, driving motor has the propulsion axle that can axial displacement and stretch out casing one side, and the outer end of propulsion axle is provided with the trip head, the trip head with be provided with the elastic component between the propulsion axle, the trip head can remove to the direction of keeping away from the propulsion axle under the spring action of elastic component, and works as the trip head can compress when receiving axial effort the elastic component and with the propulsion axle removes in opposite directions. This urgent separating brake trip gear has simple to operate's advantage.

Description

Emergency brake-separating tripping device

Technical Field

The invention belongs to the technical field of power equipment, relates to an emergency brake-separating tripping device, and particularly relates to an emergency brake-separating tripping device for a switch circuit breaker.

Background

The high-voltage switch cabinet on-off circuit breaker usually adopts a remote operation mode, namely, the remote operation is carried out in a main control room through a microcomputer. However, when the breaker fails and cannot be opened by remote operation, the operation and maintenance personnel have to perform operation in a manner of opening the breaker in a close range. During this operation, once the circuit breaker is mechanically jammed, the personal safety of the operating personnel operating nearby may be endangered.

Therefore, people design a portable mechanical and electric brake separating device of a high-voltage switch cabinet, and apply for Chinese patents, the application numbers of which are as follows: 201921739965.7, respectively; the bulletin number is: CN 210429582U; the opening device comprises a cross rod motor combination, a knob magnet base, a remote control receiver, a storage battery and a remote controller, wherein the unit combinations are used for carrying out emergency opening on the switch cabinet breaker. The knob magnet base is sleeved with two sets of longitudinal fixing rods, the transverse rod motor combination adopts transverse fixing rods, the longitudinal fixing rods and the transverse fixing rods are connected through a steering connecting piece in the transverse rod motor combination, and therefore the motor in the transverse rod motor combination can move front and back and left and right.

When the remote control switch cabinet is used, the two knob magnets are adsorbed on a panel of the switch cabinet, the position of the motor is adjusted along the transverse fixing rod and the longitudinal fixing rod, so that the tail end of the motor propelling shaft is opposite to and keeps a proper distance with the breaker opening button, then the motor propelling shaft is controlled to advance or retreat outdoors through the remote controller to realize the on-site opening operation of the breaker outdoors by field workers, and the safety is high.

However, when the position of the propelling rod of the propelling motor is adjusted to ensure that the propelling rod is opposite to the position of the opening button of the circuit breaker and a proper distance is kept between the propelling rod and the opening button of the circuit breaker, the propelling rod is completely visual and part of the visual line is blocked by the propelling motor during position adjustment, so that the propelling rod cannot be quickly adjusted to the proper position and distance in an emergency, the condition that the propelling rod cannot propel the circuit breaker effectively due to insufficient propelling distance is easy to occur, or the condition that the propelling rod is too large to cause the whole opening device to fall off and break from a panel of the switch cabinet is easy to occur.

In view of the above situation, it is an easy-to-think conventional technical means for those skilled in the art to add a distance measuring structure to the opening device instead of manual visual observation, so that when the opening device is attached to the cabinet surface of the switch cabinet, the distance measuring structure can detect and give a specific numerical value of the advancing distance, thereby improving the accuracy in position adjustment. However, in the actual operation process, the operation difficulty of manually adjusting the distance between the outer end of the motor propulsion shaft and the opening button to be accurate enough is large under the influence of various factors such as the surface flatness of the switch cabinet, manual installation and adjustment errors, distance measurement structure errors and the like.

Disclosure of Invention

The invention aims to provide an emergency brake-separating tripping device aiming at the problems in the prior art, and solves the problem that the precision of a propelling distance is difficult to ensure when the conventional brake-separating device is installed.

The purpose of the invention can be realized by the following technical scheme:

urgent separating brake trip gear, including the casing and fix absorption magnet and the driving motor on the casing, driving motor has the propulsion axle that can axial displacement and stretch out casing one side, its characterized in that, the outer end of propulsion axle is provided with the trip head, the trip head with be provided with the elastic component between the propulsion axle, the trip head can remove to the direction of keeping away from the propulsion axle under the spring action of elastic component, and works as can compress when the trip head receives axial force the elastic component and with the propulsion axle removes in opposite directions.

When the emergency brake-separating tripping device is used, an operator adsorbs the whole shell on a cabinet door of a switch cabinet through an adsorption magnet, the position of a tripping head is opposite to that of a brake-separating button, then a driving motor is started to drive a propelling shaft to axially extend, the tripping head is outwards ejected out along with the propelling shaft under the action of the elasticity of an elastic piece, and when the outer end of the tripping head moves to the brake-separating button, the brake-separating button is pressed under the action of the elasticity of the elastic piece to realize brake separation; when the pushing shaft still continues to be pushed outwards after the opening button is pressed, the tripping head abuts against the opening button and is blocked by the opening button to compress the elastic piece.

In the working process, the axial length of the whole propelling shaft for pressing the brake separating button is lengthened by arranging the jumping head at the outer end of the propelling shaft, so that the situation that the brake separating button cannot be pressed due to insufficient propelling distance of the propelling shaft is avoided; meanwhile, when the axial push-out distance of the push shaft is too large, the jump head can compress the spring to shrink, so that the situation that the whole shell is pushed away from the switch cabinet is avoided, the requirement on the installation precision of the shell is greatly reduced, and the installation is more convenient.

In foretell emergency brake-separating tripping device, the confession on the casing one side that the propulsion shaft outer end stretches out is the absorption side, still be connected with controller and distance detector on the casing, the distance detector deviates the extended position of propulsion shaft and can detect casing absorption side one side obstacle with the distance between the casing, the controller can the obstacle with control when the distance between the casing increases to the setting value driving motor withdrawal the propulsion shaft. In the scheme, the obstacle is a cabinet door of the switch cabinet, when the shell is adsorbed at a proper position on the cabinet door of the switch cabinet, the adsorption side is opposite to the cabinet door of the switch cabinet, the switch cabinet at the outer end of the propulsion shaft is not blocked and the outer end of the propulsion shaft can extend into the switch cabinet to trigger the opening button, other positions of the adsorption side deviating from the outer end of the propulsion shaft are opposite to the cabinet door of the switch cabinet, the distance between the other positions and the distance is basically kept constant, the distance detector is used for detecting the distance between the adsorption side and the cabinet door of the switch cabinet, when the distance is small and large and reaches a set value, the situation that the shell is separated from the cabinet door due to excessive propulsion of the propulsion shaft is judged, at the moment, the controller receives a signal sent by the distance detector, controls the driving motor to stop pushing out the propulsion shaft and drive the propulsion shaft to reversely retract, the shell is prevented from falling off from the switch, the distance precision requirement between the propulsion shaft and the opening button is further reduced when the shell is installed. Here, the set value may be set according to an interval between a space when the housing is mounted on the cabinet door of the switch cabinet and a space when the housing drops in an actual test.

In the emergency brake-separating tripping device, the casing is further connected with a sound detector capable of detecting the size of the environmental sound, and the controller can control the driving motor to retract into the propulsion shaft when the environmental sound is larger than a set value. Switch cabinet separating brake button is pressed, can send a sound when realizing the separating brake and beat the sound, detects the separating brake state and by the withdrawal of controller timely control propulsion axle after the separating brake is accomplished through the sound detector, avoids the propulsion axle to impel excessively, cooperates the use of above-mentioned distance detector, carries out duplicate protection to the condition that the propulsion axle impeld excessively, effectively avoids leading to the condition that whole casing drops because of the installation distance is too tight.

In the emergency brake-separating tripping device, the distance detector comprises a long rod-shaped ejector rod, a switch connected with the controller and an elastic sheet connected to the switch, the inner end of the ejector rod can abut against the elastic sheet, the elastic sheet can enable the outer end of the ejector rod to extend out of the adsorption side of the shell under the action of self elasticity, and the switch can send a backspacing signal to the controller when the ejector rod is ejected outwards by the elastic sheet to a set distance. When the shell is adsorbed on the door of the switch cabinet, the switch cabinet door blocks the ejector rod to extend outwards, the inner end of the ejector rod acts on the elastic sheet to enable the elastic sheet to bend inwards, when the propelling distance of the propelling shaft is too large, the shell is gradually far away from the door of the switch cabinet, the elastic sheet recovers under the action of self elasticity and pops outwards, the ejector rod is ejected outwards under the elasticity of the elastic sheet, the elastic sheet is far away from the switch, the switch sends a backspacing signal to the controller, and the driving motor drives the propelling shaft to backspace. The mechanical distance detector is less influenced by external environmental factors, and the detection result is more reliable.

In the emergency brake-separating tripping device, the ejector rod comprises a rod body and an adjusting sleeve in threaded connection with the outer side of the outer end of the rod body, and the adjusting sleeve is made of an insulating material. The adjusting sleeve made of the insulating material can not only ensure the use safety, but also adjust the overall axial length of the ejector rod by rotating the adjusting sleeve, so that the distance detection of the ejector rod in the same tripping device can be suitable for more different switch cabinet use requirements, and the application range is wide.

As another case, in the emergency brake-separating tripping device, the distance detector includes an infrared distance measuring sensor.

In foretell emergency brake separating trip device, beat the trip head and be the tubbiness and open one pot head and establish the outside of propulsion axle outer end, the outside threaded connection of propulsion axle outer end has and is annular go-between, the inner wall of beating trip head open end one end has convex spacing portion, the elastic component both ends are used in respectively beating trip head blind end inboard and go-between, spacing portion can with the go-between offsets and leans on. The beating head is barrel-shaped and is sleeved outside the propelling shaft, so that the radial size of the beating head is increased, the requirement on the installation precision of the radial position of the propelling shaft is lowered, and the installation is further facilitated. In addition, according to different actual use environments, the overall axial length of the propulsion shaft and the jumping head can be adjusted by rotating the connecting ring so as to adapt to the use requirements of different use environments.

In the emergency brake-separating tripping device, the tripping head is fixed with the detection magnet, the side of the casing, from which the propulsion shaft extends, is fixed with the magnetic switch, the magnetic switch is connected with the controller, and the positions of the magnetic switch and the detection magnet correspond to each other. After the opening button is pressed, the propulsion shaft retracts reversely until the detection magnet is close to the magnetic switch, the magnetic switch is closed, and the controller sends a signal to the driving motor to control the driving motor to stop working. The return control is realized by the matching of the detection magnet and the magnetic switch, and the influence on the next extending stroke caused by too much retraction of the propelling shaft is avoided.

In the emergency brake-separating tripping device, a protruding annular positioning ring is arranged at the extending part of the propelling shaft on the side surface of the shell, the outer end of the propelling shaft can penetrate through the positioning ring, and the magnetic switch is fixed at the positioning ring. The holding ring bulges the side of the shell, so that convenience is provided for the installation of the magnetic switch, and the position indication of the propulsion shaft is provided when the shell is installed on the door of the switch cabinet, so that the installation is more facilitated.

In the emergency brake-separating tripping device, the casing is provided with an outlet hole, the side wall of the outlet hole is provided with a concave straight strip-shaped guide groove along the axial direction, the outer side of the tripping head is provided with a convex guide part, and the guide part extends into the guide groove. The movement of the beating head is more stable through the matching of the guide groove and the guide part.

Compared with the prior art, the emergency brake-separating tripping device has the following advantages:

1. the mode that the jumping head is sleeved on the outer side of the propelling shaft and the elastic piece is arranged between the jumping head and the propelling shaft is adopted, so that the axial length and the radial width of the propelling shaft are increased, the mounting precision requirement of the casing of the jumping device when the casing is adsorbed on a switch cabinet door is reduced, the installation is facilitated, and the casing is prevented from falling off from the switch cabinet.

2. Detect the dual detection that separating brake beat the sound and whether distance detection ware detects the casing and breaks away from the cubical switchboard cabinet door through the sound detector and realize advancing the excessive duplicate protection of axle propulsion, effectively guaranteed that the casing can not drop, and then reduced the axial distance required precision when installing the casing, made things convenient for the installation.

Drawings

Fig. 1 is a schematic sectional structural view of the emergency brake-separating tripping device.

Fig. 2 is a schematic sectional structural view of the emergency brake-separating tripping device from another view angle.

Fig. 3 is a schematic structural diagram of the adsorption side of the emergency brake-separating tripping device.

Fig. 4 is a schematic sectional view of the tripping head of the emergency brake-separating tripping device when the tripping head compresses the elastic member.

Fig. 5 is a functional block diagram of the emergency brake-separating tripping device.

In the figure, 1, a housing; 11. an adsorption side; 12. a positioning ring; 13. an outlet hole is formed; 2. adsorbing a magnet; 3. a drive motor; 31. a propeller shaft; 4. beating the head; 41. a limiting part; 5. an elastic member; 6. a controller; 7. a distance detector; 71. a top rod; 72. a switch; 73. a spring plate; 8. a sound detector; 9. a connecting ring; 10. detecting the magnet; 101. a magnetic switch.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1, the emergency opening tripping device includes a housing 1, and an adsorption magnet 2 and a driving motor 3 fixed on the housing 1, wherein one side of the housing 1 is an adsorption side 11 arranged opposite to the switch cabinet, and the housing 1 of the adsorption side 11 is provided with an exit hole 13. The drive motor 3 has a propulsion shaft 31 which can be passed axially through the outlet opening 13 and which projects from the suction side 11 out of the housing 1. In the embodiment, the adsorption magnet 2 is a knob magnet and at least two magnets are fixed on the shell 1; the driving motor 3 is a propelling motor capable of driving the propelling shaft 31 to move axially, and one side of the adsorption side 11 of the shell 1 is a plane.

The outer end of the propulsion shaft 31 is provided with a jumping head 4, the jumping head 4 is cylindrical and has an opening end sleeved on the outer end of the propulsion shaft 31, the outer side of the outer end of the propulsion shaft 31 is in threaded connection with a connecting ring 9 in a circular ring shape, the inner wall of the opening end of the jumping head 4 is provided with a protruding limiting part 41 in a circular ring shape, an elastic part 5 is arranged between the jumping head 4 and the propulsion shaft 31, two ends of the elastic part 5 respectively act on the inner side of the closed end of the jumping head 4 and the connecting ring 9, and the limiting part 41 can be abutted against the connecting ring 9 under the elastic force action of the elastic part 5. In this embodiment, the beating head 4 is a split structure, and includes a cylindrical barrel and an end cover screwed to the front end of the barrel; the elastic piece 5 is a spring; a locking hole is formed through the side of the connection ring 9, a locking pin is connected in the locking hole, and after the connection ring 9 is in threaded connection with the propulsion shaft 31, the relative position between the connection ring 9 and the propulsion shaft 31 can be locked through the locking pin.

The side wall of the through hole 13 is provided with a plurality of guide grooves which are recessed and are in a straight strip shape along the axial direction, the guide grooves are uniformly distributed around the axis of the through hole 13, the outer side of the beating head 4 is provided with a convex guide part which is in a straight strip shape, and the guide part extends into the guide grooves and can move back and forth along the guide grooves. In the present embodiment, the matching structure of the guide groove and the guide portion can be used for guiding the axial movement of the beating head 4, and a spline structure can be used for matching according to needs.

The position, on the adsorption side 11 of the shell 1, of the propulsion shaft 31, where the propulsion shaft extends out, is provided with a protruding annular positioning ring 12, the outer end of the propulsion shaft 31 and the jumping head 4 can pass through the positioning ring 12, and a detection magnet 10 is further fixed in an end cover of the jumping head 4.

As shown in fig. 3, a magnetic switch 101 is fixed to the positioning ring 12 of the housing 1, and the magnetic switch 101 corresponds to the position of the detection magnet 10 and can detect whether the detection magnet 10 moves to the corresponding position. A distance detector 7 is arranged on the suction side 11 of the housing 1 at a position deviating from the extending position of the propulsion shaft 31, and the distance detector 7 can detect whether the distance between an obstacle arranged on the suction side 11 of the housing 1 and the housing 1 reaches a set value. Here, the set value may be 1mm to 10 mm; preferably 4 mm.

As shown in fig. 2, the distance detector 7 includes a long rod-shaped top bar 71, a switch 72, and a spring plate 73 connected to the switch 72, one end of the spring plate 73 is connected to the switch 72, the other end of the spring plate springs outward under the action of its own elastic force, the inner end of the top bar 71 can abut against the other end of the spring plate 73, the outer end of the top bar 71 can extend out from the suction side 11 of the housing 1, and the switch 72 can send a retraction signal when the other end of the spring plate 73 springs the top bar 71 outward to a set distance. In order to prevent the ejector rod 71 from being ejected completely, the outer side of the ejector rod 71 is provided with a convex annular shoulder.

As shown in fig. 5, the emergency brake-separating tripping device further includes a controller 6 and a sound detector 8, wherein the sound detector 8, the distance detector 7, the driving motor 3, and the magnetic switch 101 are all connected to the controller 6. Wherein, the sound detector 8 can detect the size of the environmental sound, and the controller 6 can control the driving motor 3 to retract the propulsion shaft 31 when the environmental sound is larger than a set value; in addition, the controller 6 can control the driving motor 3 to retract the propulsion shaft 31 when the distance between the cabinet door of the switch cabinet as an obstacle and the housing 1 increases to a set value, and can control the driving motor 3 to stop operating when the magnetic switch 101 detects the detection magnet 10. Here, the ambient sound decibel setting value may be 30 to 80 decibels, preferably 50 decibels.

When this urgent separating brake trip gear used, operating personnel adsorbed whole casing 1 on the cabinet door of cubical switchboard through absorption magnet 2 to the separating brake button in the holding ring 12 that will bulge in 1 absorption side 11 of casing and the cubical switchboard just right, need not to adjust relative distance between them. Then, the driving motor 3 is started to drive the propelling shaft 31 to axially extend outwards, and the beating head 4 is ejected outwards along with the propelling shaft 31 under the action of the elastic force of the elastic piece 5. As shown in fig. 4, when the outer end of the trip head 4 moves to the position of the opening button, the opening button is pressed under the action of the elastic force of the elastic piece 5 to realize opening; when the opening button is pressed, if the propelling shaft 31 is still pushed outwards, the trip head 4 abuts against the opening button and is blocked by the opening button to compress the elastic part 5, so that the whole shell 1 is prevented from being pushed open due to the fact that the propelling shaft 31 is excessively propelled.

When the brake is opened, a sound of beating is generated, the sound detector 8 detects the sound to judge the brake opening state and sends a signal to the controller 6 after the brake opening is completed, and the controller 6 timely controls the propulsion shaft 31 to retract so as to avoid the propulsion shaft 31 from being excessively propelled.

After the controller 6 controls the propulsion shaft 31 to retract, the magnetic switch 101 at the positioning ring 12 detects that the detection magnet 10 retracts to the positioning ring 12, sends a signal to the controller 6, and the controller 6 controls the driving motor 3 to stop working.

In the process that the pushing shaft 31 is pushed outwards, the outer end of the ejector rod 71 of the distance detector 7 is always abutted against the cabinet door of the switch cabinet, the elastic sheet 73 is kept in a compressed state, when the push-out distance of the push-out shaft 31 is too large and the opening trip sound is not heard all the time or the sound detector 8 malfunctions, the shell 1 can overcome the magnetic attraction of the adsorption magnet 2 and be separated outwards, the distance between the adsorption side 11 of the shell 1 and the cabinet door of the switch cabinet is continuously increased until reaching a set value, the elastic sheet 73 is completely ejected and separated from the switch 72, and it is determined that the housing 1 is separated from the cabinet door of the switch cabinet and is about to drop due to the excessive push of the push shaft 31, the controller 6 receives a signal sent by the switch 72 in the distance detector 7, controls the driving motor 3 to stop pushing out the propulsion shaft 31 and drive the propulsion shaft 31 to retract reversely, so as to prevent the shell 1 from falling off from the cabinet door of the switch cabinet, and effectively protect the excessive propulsion condition of the propulsion shaft 31.

The above setting values are only examples, and the specific value setting can be tested in the field according to the actual use environment, and the indication value of each critical point is used as a reference value, and an appropriate parameter range is selected as the setting value.

Example two

The scheme of this embodiment is substantially the same as that of the first embodiment, except that: the mandril 71 comprises a rod body and an adjusting sleeve which is connected with the outer side of the outer end of the rod body in a threaded manner, and the adjusting sleeve is made of insulating materials; when the jumping device is used, the axial length of the whole ejector rod 71 can be adjusted by rotating the adjusting sleeve, so that the distance detection of the ejector rod 71 in the same jumping device can be suitable for more different switch cabinet use requirements; the distance detector 7 can also adopt an infrared distance measuring sensor; the elastic member 5 may be a filler having elasticity itself, such as silicone rubber or rubber.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (10)

1. Urgent separating brake trip gear, including casing (1) and fix absorption magnet (2) and driving motor (3) on casing (1), driving motor (3) have can axial displacement and stretch out propulsion axle (31) of casing (1) one side, its characterized in that, the outer end of propulsion axle (31) is provided with trip head (4), trip head (4) with be provided with elastic component (5) between propulsion axle (31), trip head (4) can be to the direction removal of keeping away from propulsion axle (31) under the spring action of elastic component (5), and work as can compress when trip head (4) receive axial force elastic component (5) and with propulsion axle (31) move in opposite directions.

2. The emergency opening tripping device according to claim 1, wherein a side of the housing (1) from which the outer end of the propulsion shaft (31) extends is an absorption side (11), the housing (1) is further connected with a controller (6) and a distance detector (7), the distance detector (7) deviates from the extending position of the propulsion shaft (31) and can detect the distance between an obstacle on the absorption side (11) of the housing (1) and the housing (1), and the controller (6) can control the driving motor (3) to retract into the propulsion shaft (31) when the distance between the obstacle and the housing (1) increases to a set value.

3. The emergency brake-separating tripping device according to claim 2, characterized in that a sound detector (8) capable of detecting the magnitude of the environmental sound is further connected to the housing (1), and the controller (6) is capable of controlling the driving motor (3) to retract the propulsion shaft (31) when the environmental sound is larger than a set value.

4. The emergency opening tripping device according to claim 2 or 3, wherein the distance detector (7) comprises a long rod-shaped ejector rod (71), a switch (72) connected with the controller (6) and an elastic sheet (73) connected to the switch (72), the inner end of the ejector rod (71) can abut against the elastic sheet (73), the elastic sheet (73) can enable the outer end of the ejector rod (71) to extend out of the adsorption side (11) of the housing (1) under the action of self elasticity, and the switch (72) can send a retraction signal to the controller (6) when the elastic sheet (73) ejects the ejector rod (71) outwards to a set distance.

5. The emergency opening brake tripping device according to claim 4, wherein the push rod (71) comprises a rod body and an adjusting sleeve which is in threaded connection with the outer end of the rod body, and the adjusting sleeve is made of an insulating material.

6. Emergency opening brake tripping device according to claim 2 or 3, characterized in that the distance detector (7) comprises an infrared distance measuring sensor.

7. The emergency brake separating and tripping device according to claim 1, 2 or 3, wherein the tripping head (4) is barrel-shaped, an opening end of the tripping head is sleeved outside the outer end of the propulsion shaft (31), the outer side of the outer end of the propulsion shaft (31) is in threaded connection with a ring-shaped connecting ring (9), the inner wall of the opening end of the tripping head (4) is provided with a convex limiting part (41), two ends of the elastic member (5) respectively act on the inner side of the closed end of the tripping head (4) and the connecting ring (9), and the limiting part (41) can abut against the connecting ring (9).

8. The emergency brake-separating tripping device according to claim 2 or 3, characterized in that a detection magnet (10) is fixed on the tripping head (4), a magnetic switch (101) is fixed on the side of the casing (1) from which the propulsion shaft (31) extends, the magnetic switch (101) is connected with the controller (6), and the positions of the magnetic switch (101) and the detection magnet (10) correspond.

9. The emergency brake-separating tripping device according to claim 8, characterized in that the side of the casing (1) from which the propulsion shaft (31) extends is provided with a protruding ring-shaped positioning ring (12), the outer end of the propulsion shaft (31) can pass through the positioning ring (12), and the magnetic switch (101) is fixed at the positioning ring (12).

10. The emergency brake-separating tripping device according to claim 1, 2 or 3, characterized in that the housing (1) is provided with an outlet hole (13), the side wall of the outlet hole (13) is provided with a concave straight-bar-shaped guide groove along the axial direction, and the outer side of the tripping head (4) is provided with a convex guide part which extends into the guide groove.

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