CN111721246A - Spherical surface automatic measuring device that beats - Google Patents
Spherical surface automatic measuring device that beats Download PDFInfo
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- CN111721246A CN111721246A CN202010685049.0A CN202010685049A CN111721246A CN 111721246 A CN111721246 A CN 111721246A CN 202010685049 A CN202010685049 A CN 202010685049A CN 111721246 A CN111721246 A CN 111721246A
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- mandrel
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- measuring device
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- positioning mechanism
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention relates to a spherical bounce automatic measuring device, which comprises a base, a three-coordinate positioning mechanism and a measuring mechanism, wherein the three-coordinate positioning mechanism and the measuring mechanism are arranged on the base; the positioning mechanism comprises a vertically arranged mandrel and a rotary executing mechanism for driving the mandrel to rotate, and the rotary executing mechanism is fixedly arranged on the base; the mandrel is in a circular truncated cone shape and is used for positioning the measuring position of the valve plate; the aperture of the central through hole is between the diameter of the upper end and the diameter of the lower end of the mandrel, and the taper of the mandrel is less than tan‑1R/2L; where R is the maximum allowable spherical run-out tolerance and L is the maximum measured length at the outer edge of the spherical face side. The advantages are that: the automatic measuring device is provided with a positioning mechanism and a three-coordinate measuring mechanism, wherein the positioning mechanism is provided with a mandrel driven by an actuating mechanism to rotate, the mandrel is in a circular truncated cone shape, and the taper of the mandrel is configured to be related to the spherical bounce precision and the maximum measuring length of the spherical side, so that the requirement of measuring precision is met. The automatic measuring device is simple in structure and suitable for wide popularization and application in the industry.
Description
Technical Field
The invention relates to the technical field of engineering mechanical equipment, in particular to an automatic measuring device for spherical surface jumping.
Background
The hydraulic variable pump can adjust output characteristics within a certain range according to working requirements under the action of a variable control device, and the characteristic is widely applied to a plurality of hydraulic devices, such as: constant current control, constant voltage control, constant speed control, constant torque control, constant power control, power matching control, and the like. The variable pump (motor) system has obvious energy-saving effect, is more and more widely used in recent years, has a rapid development of new structures and control modes, and is continuously improved and designed by various production plants to meet the continuous development requirement of automatic control of the hydraulic system.
The valve plate, which is a main part in the variable displacement pump, is matched with the spherical surface of the cylinder body, so that the plunger can uniformly act after an oil film is formed, and the design requirement is met. For the spherical matching, a designer generally gives the spherical bounce of the valve plate, and if the bounce is out of tolerance, the matching of the valve plate and the cylinder body is directly influenced, so that the flow is uneven. The manufacturing quality of the sphere directly affects the overall performance of the variable displacement pump. In order to ensure the quality of the spherical surface side of the valve plate, strict spherical surface bounce measurement needs to be carried out after the valve plate is manufactured, and if the bounce amplitude of the spherical surface is too large, the quality of the spherical surface of the valve plate is unqualified.
Because the spherical surface is a curved surface body, the conventional measuring instrument cannot directly measure the spherical surface bounce. In the prior art, when suspected jitter is usually caused, a three-coordinate measuring instrument is often used for detecting the suspected jitter, but the bottom of the valve plate cannot be simply placed on a flat plate for measurement because the other surface of the valve plate opposite to the spherical surface is a cambered surface. There is no current measurement scheme for the port plate.
Disclosure of Invention
The invention aims to provide an automatic measuring device for spherical surface run-out, aiming at the structural defects in the prior art, and meeting the requirement of measuring precision by designing the automatic measuring device which is provided with a positioning mechanism and a three-coordinate measuring mechanism, wherein the positioning mechanism is provided with a mandrel driven by an actuating mechanism to rotate, the mandrel is in a circular truncated cone shape, and the taper of the mandrel is configured to be related to the spherical surface run-out precision and the maximum measuring length on the spherical surface side. The automatic measuring device is simple in structure and suitable for wide popularization and application in the industry.
In order to achieve the above purpose, an automatic measuring device for spherical surface run-out according to an embodiment of the present invention is implemented by the following technical solutions:
an automatic measuring device for spherical bounce relates to a valve plate with a spherical side surface contacting with a cylinder body, wherein a cylindrical central through hole is arranged at the center of the spherical side surface, and the other side of the valve plate opposite to the spherical side surface is a cambered surface; the method is characterized in that: the automatic measuring device comprises a base, a positioning mechanism and a three-coordinate measuring mechanism, wherein the positioning mechanism and the three-coordinate measuring mechanism are arranged on the base; the positioning mechanism comprises a vertically arranged mandrel and a rotary executing mechanism for driving the mandrel to rotate, and the rotary executing mechanism is fixedly arranged on the base; the mandrel is in a circular truncated cone shape and is used for penetrating through the central through hole so as to position the measuring position of the valve plate; the aperture of the central through hole is between the diameter of the upper end and the diameter of the lower end of the mandrel, and the taper of the mandrel is less than tan-1R/2L; where R is the maximum allowable spherical run-out tolerance and L is the maximum measured length at the outer edge of the spherical face side.
The taper of the mandrel is tan ═ tan-1ES-EI/2nH, wherein ES is the upper deviation of the aperture phi of the central through hole of the valve plate, EI is the lower deviation of the aperture phi of the central through hole of the valve plate, H is the measured height at the outer edge of the spherical surface side, and the value interval of n is a natural number not less than 4.
The three-coordinate positioning mechanism comprises a rotary table, a cross arm and a vertical arm, wherein the cross arm and the vertical arm are respectively provided with a slide rail, the vertical arm is vertically arranged on the base in a rotatable mode through the rotary table, a first transmission screw rod parallel to the vertical arm is further arranged on the rotary table, the first rotation screw rod is driven to rotate by a first motor, and a nut directly or indirectly connected with a first slide block on the first slide rail of the vertical arm is in threaded connection with the first rotation screw rod; the cross arm is arranged on the first sliding block and can move along the length direction of the vertical arm, the first sliding block is also provided with a second transmission screw rod which is arranged in parallel with the cross arm, the second rotation screw rod is driven by a second motor to rotate, and a nut which is directly or indirectly connected with the second sliding block on a second sliding rail of the cross arm is in threaded connection with the second rotation screw rod; a probe is movably arranged on the second sliding block; and linear displacement sensors are respectively arranged on the first sliding rail and the second sliding rail, and an angular displacement sensor is arranged between the rotary table and the base.
Compared with the prior art, the invention has the beneficial effects that: by designing the automatic measuring device which is provided with the positioning mechanism and the three-coordinate measuring mechanism, the positioning mechanism is provided with the mandrel driven by the actuating mechanism to rotate, the mandrel is in a circular truncated cone shape, and the taper of the mandrel is configured to be related to the spherical bounce precision and the maximum measuring length of the spherical side, so that the measuring precision requirement is met. The automatic measuring device can realize direct measurement of the spherical bounce of the valve plate, remarkably improves the measurement efficiency and measurement precision of the spherical bounce measurement of the valve plate, has a simple structure, is convenient to manufacture, is very suitable for the measurement requirement in the batch production of the valve plate, and is suitable for wide popularization and application in the industry.
Drawings
The above features and advantages of the present invention will become more apparent and readily appreciated from the following description of the exemplary embodiments thereof taken in conjunction with the accompanying drawings.
FIG. 1 is a schematic structural view of a port plate measured according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an automatic measuring device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a measuring tool and a port plate in the embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures to facilitate understanding by those skilled in the art:
referring to fig. 1, there is shown a structure of a port plate for measurement according to an embodiment of the present invention, a side surface of the port plate 1 contacting a cylinder body is a spherical surface side 11, a cylindrical central through hole 12 is provided at a center of the spherical surface side 11, a plurality of port windows 13 are provided around the central through hole 12, and another side of the port plate opposite to the spherical surface side 11 is an arc surface.
Referring to fig. 2, the present measuring device relates to an automatic spherical runout measuring device for the above port plate, and the automatic measuring device includes a base 4, and a positioning mechanism 2 and a three-coordinate measuring mechanism 3 which are arranged on the base 4. Wherein:
positioning mechanism 2
The positioning mechanism 2 includes a vertically-arranged spindle 22 and a rotation actuator for driving the spindle 22 to rotate. In this embodiment. The rotary actuator is a motor 21, and the rotary shaft of the motor 21 is connected to a spindle 22 through an adapter 23. The bottom of the motor 21 is fixedly mounted on one side of the base 4.
The mandrel 22 is in a circular truncated cone shape, the aperture of the central through hole 12 is between the upper end diameter and the lower end diameter of the mandrel 22, and therefore the mandrel 22 is used for penetrating through the central through hole 12 of the valve plate 1, and the valve plate 1 is fixed and positioned by the mandrel 22. The reason why the mandrel 22 is provided in a circular truncated cone shape is: if the spindle 22 is set to be cylindrical, when the aperture of the central through hole 12 of the port plate 1 is larger than the axial diameter of the spindle 22, the central through hole will incline left or right, which results in inaccurate measurement; and when the diameter of the hole is smaller than the diameter of the shaft (no gap), the workpiece cannot be placed. To address this problem, applicants have designed the mandrel 22 to be tapered. The taper of the mandrel 22 is determined as follows:
and determining the taper of the upper mandrel of the measuring tool based on the allowed maximum spherical bounce tolerance R, the maximum measured length L and the measured height H at the outer edge of the spherical surface side, and the upper deviation ES and the lower deviation EI of the aperture phi of the central through hole of the valve plate.
The mode of the taper determination is as follows: dividing the area between the upper deviation ES and the lower deviation EI into n parts, and calculating tan- 1ES-EI/2nH, substitution < tan-1In R/2L, determining the value if the n value is met, re-taking the value of n if the n value is not met, wherein the value interval of n isA natural number of not less than 4.
The above formula is illustrated below with specific examples:
the aperture of the central through hole of the valve plate 1 is
To ensure the accuracy of the measurement, we break it down into six segments, i.e. n is 6, i.e. one measurement set every 0.003 mm. We select a certain one of the segments as an example,
the width of the tolerance band in the segment is (ES-EI)/2, namely 0.0015 mm.
1/2 taper β: β ═ tan-10.0015mm/18mm (measured height) is 0.00083 °.
When the maximum measured length L is 37mm and the runout tolerance R is 0.02mm, the angle α corresponding to the maximum runout tolerance is α ═ tan-10.02mm (runout tolerance)/2 x 37mm (measured length) is 0.0155 °.
＜tan-1R/2L, i.e., α: β should be greater than 4.
Substituting the values of α and β to obtain α: β -0.0155 °: 0.00083 degree ≈ 5: 1.
The taper (2 β) of the measuring tool is then determined as: 0.0017. The solution to the height direction is that the difference of the upper diameter and the lower diameter of the mandrel is 0.003mm within the measuring range of 18 mm. That is, in the limit state, if the runout reading is 0.02mm at the outer edge (farthest end) of the spherical surface side, the maximum runout degree can be 0.024mm, and the measurement requirement can be met.
Three-coordinate positioning mechanism
The three-coordinate positioning mechanism 3 comprises a rotary table 31, and a cross arm 32 and a vertical arm 33 which are respectively provided with a slide rail, wherein the vertical arm 33 is vertically arranged on the base 4 in a rotatable manner through the rotary table 31.
The turntable 31 is circular, and has a square hole in the center of the upper surface for mounting the vertical arm 33. At the edge of the turntable 31, there is a bearing mounting location, in which a bearing is mounted. And the center of the bottom surface of the turntable 31 is provided with a round hole in which a shaft sleeve is arranged. The lower part of the circumference of the turntable 31 is in the shape of a gear, and is engaged with the gear to transmit the power of the rotation of the turntable 31.
The corresponding base 4 is also provided with a shaft sleeve, an optical axis is matched with the shaft sleeves on the base 4 and the rotary table 31, and the lower end of the optical axis is connected with an angular displacement sensor for measuring the rotation angle of the rotary table 31. The base 4 is further provided with a motor 41, and a rotating shaft of the motor 41 is connected with a gear on the bottom surface of the rotary table 31 through a coupler to provide rotating power for the rotary table 31.
The turntable 31 is further provided with a first transmission screw 34 arranged parallel to the vertical arm 33, the lower end of the first transmission screw 34 is supported by a bearing of a bearing mounting position of the turntable 31, and the upper end of the first transmission screw is supported and fixed by another bearing and is driven to rotate by a first motor 341. The first rotating screw rod 34 is connected with a nut 342 directly or indirectly connected with the first slide block on the first slide rail of the vertical arm 33 through screw threads. A linear displacement sensor is also mounted on the side surface of the first slide rail of the vertical arm 33.
The cross arm 32 is mounted to the first slider so as to be movable in the longitudinal direction of the upright arm 33. The first slide block is also provided with a second transmission screw 35 arranged parallel to the cross arm 32, and the second rotation screw 35 is also supported by bearings at both ends and driven to rotate by a second motor 351. The second rotary screw rod is in threaded connection with a nut 352 which is directly or indirectly connected with the second slide block on the second slide rail of the cross arm 32. A linear displacement sensor is mounted on the side surface of the second slide rail of the cross arm 32. A probe 36 is movably mounted on the second slider of the second slide rail of the cross arm 32.
When in use, the probe 36 is adjusted to abut against the outer edge of the spherical surface side 11 of the port plate 1, so that the spherical bounce of the spherical surface side 11 can be measured.
In conjunction with the above-described device structure, its method of use is described below:
1) the valve plate 1 is sleeved on a mandrel 22 of the measuring tool 2, so that no gap exists between the valve plate 1 and the mandrel 22.
2) The probe 36 of the three-coordinate measuring mechanism 3 is placed at the outer edge of the sphere side 11 of the port plate 1.
3) The motor 21 drives the measuring tool 2 to rotate, and data acquisition is carried out. The difference between the maximum and minimum of the readings is the amount of bounce.
Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that the above embodiments are only one of the preferred embodiments of the present invention, and not all embodiments can be enumerated herein for the sake of brevity, and any embodiment that can embody the claims of the present invention is within the protection scope of the present invention.
It should be noted that the above-mentioned embodiments are provided for further detailed description of the present invention, and the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make various modifications and variations on the above-mentioned embodiments without departing from the scope of the present invention.
Claims (3)
1. An automatic measuring device for spherical bounce relates to a valve plate with a spherical side surface contacting with a cylinder body, wherein a cylindrical central through hole is arranged at the center of the spherical side surface, and the other side of the valve plate opposite to the spherical side surface is a cambered surface; the method is characterized in that: the automatic measuring device comprises a base, a three-coordinate positioning mechanism and a measuring mechanism, wherein the three-coordinate positioning mechanism and the measuring mechanism are arranged on the base; the positioning mechanism comprises a vertically arranged mandrel and a rotary executing mechanism for driving the mandrel to rotate, and the rotary executing mechanism is fixedly arranged on the base; the mandrel is in a circular truncated cone shape and is used for penetrating through the central through hole so as to position the measuring position of the valve plate; the aperture of the central through hole is between the diameter of the upper end and the diameter of the lower end of the mandrel, and the taper of the mandrel is less than tan- 1R/2L; where R is the maximum allowable spherical run-out tolerance and L is the maximum measured length at the outer edge of the spherical face side.
2. The spherical jump automatic measuring device according to claim 1, characterized in that: the taper of the mandrel is tan ═ tan-1ES-EI/2nH, wherein ES is the upper deviation of the aperture phi of the central through hole of the port plate, EI is the lower deviation of the aperture phi of the central through hole of the port plate, H is the measured height at the outer edge of the spherical surface side, and n takes the valueThe interval is a natural number not less than 4.
3. The spherical jump automatic measuring device according to claim 2, characterized in that: the three-coordinate positioning mechanism comprises a rotary table, a cross arm and a vertical arm, wherein the cross arm and the vertical arm are respectively provided with a slide rail, the vertical arm is vertically arranged on the base in a rotatable mode through the rotary table, a first transmission screw rod parallel to the vertical arm is further arranged on the rotary table, the first rotation screw rod is driven to rotate by a first motor, and a nut directly or indirectly connected with a first slide block on the first slide rail of the vertical arm is in threaded connection with the first rotation screw rod; the cross arm is arranged on the first sliding block and can move along the length direction of the vertical arm, the first sliding block is also provided with a second transmission screw rod which is arranged in parallel with the cross arm, the second rotation screw rod is driven by a second motor to rotate, and a nut which is directly or indirectly connected with the second sliding block on a second sliding rail of the cross arm is in threaded connection with the second rotation screw rod; a probe is movably arranged on the second sliding block; and linear displacement sensors are respectively arranged on the first sliding rail and the second sliding rail, and an angular displacement sensor is arranged between the rotary table and the base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010685049.0A CN111721246A (en) | 2020-07-16 | 2020-07-16 | Spherical surface automatic measuring device that beats |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010685049.0A CN111721246A (en) | 2020-07-16 | 2020-07-16 | Spherical surface automatic measuring device that beats |
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| Publication Number | Publication Date |
|---|---|
| CN111721246A true CN111721246A (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010685049.0A Pending CN111721246A (en) | 2020-07-16 | 2020-07-16 | Spherical surface automatic measuring device that beats |
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| CN (1) | CN111721246A (en) |
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2020
- 2020-07-16 CN CN202010685049.0A patent/CN111721246A/en active Pending
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