Measuring device and method for median force of torque motor

Abstract

The invention discloses a device and method for measuring the median force of a torque motor, and belongs to the technical field of electro-hydraulic servo valve detection equipment.The device comprises a support, a testing tool, a lifting sliding table, a translation mechanism, a force sensor and a small ball clamp, the lifting sliding table is arranged at the lower end of the support, and the translation mechanism is arranged at the upper end of the support; the small ball clamp comprises a clamp pipe with a vertical through opening in the middle, a ball holding type clamp head part located in the clamp pipe and a double-end screw installed at one end of the clamp pipe and used for being connected with a force sensor, and through the mode, the torque motor neutral-position force measuring device is compact in structure, convenient to adjust and high in measuring precision; precise adjustment of the position of the small ball is achieved through the lifting and fine adjustment structure, and stable and reliable meso-position force measurement is achieved through the high-precision sensor and the light fixture structure.

Description

Technical Field

[0001] This invention relates to the field of electro-hydraulic servo valve testing equipment technology, specifically to a measuring device and method for the neutral force of a torque motor. Background Technology

[0002] Torque motors are a crucial component of electro-hydraulic servo valves, and their performance directly impacts the valve's accuracy, sensitivity, stability, and dynamic response characteristics. The torque motor's neutral force is a key performance indicator, characterizing the force characteristics of the torque motor in its neutral position. Existing neutral force measurements often employ weights or simple loading devices, which suffer from complex operation, low accuracy, and poor repeatability. Furthermore, they cannot achieve precise ball alignment and consistent force direction adjustment, resulting in significant testing errors. Therefore, there is an urgent need for a torque motor neutral force measurement device with a reasonable structure, flexible adjustment, and high measurement accuracy to improve the accuracy and repeatability of neutral force detection. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a torque motor center force measuring device that is compact in structure, easy to adjust and has high measurement accuracy. It achieves precise adjustment of the position of the ball through a lifting and fine-tuning structure, and achieves stable and reliable center force measurement through a high-precision sensor and a lightweight clamping structure.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a measuring device for the mid-position force of a torque motor, comprising: a bracket, a testing fixture, a lifting slide, a translation mechanism, a force sensor, and a ball clamp;

[0005] The lifting slide is located at the lower end of the support, the translation mechanism is located at the upper end of the support, the test fixture is detachably installed on the lifting slide and is driven by the lifting slide to move vertically, the force sensor is installed on the translation mechanism and is driven by the translation mechanism to move horizontally, the ball clamp is installed on the force sensor, and the torque motor is installed on the test fixture.

[0006] The ball clamp includes a clamp tube with a vertical through-hole in the middle, a ball-holding clamp head located in the clamp tube, and a double-ended screw installed at one end of the clamp tube for connecting a force sensor. The ball-holding clamp head includes a first ball-holding clamp head and a second ball-holding clamp head. The second ball-holding clamp head is installed inside the clamp tube. The first ball-holding clamp head is slidably connected inside the clamp tube and moves closer to or away from the second ball-holding clamp head. The position where the first ball-holding clamp head and the second ball-holding clamp head are close to each other is located at the through-hole.

[0007] The test fixture drives the torque motor to move up and down in a direction perpendicular to the direction the force sensor drives the ball clamp to move in a translational direction. The through-hole can move directly above the ball of the torque motor. The first ball-holding clamp moves closer to the second ball-holding clamp to hold the ball of the torque motor.

[0008] As a preferred embodiment of the present invention, the ball clamp further includes a resin screw, which is threadedly connected to the end of the clamp tube away from the double-ended screw.

[0009] As a preferred embodiment of the present invention, the first ball-holding clamp is provided with a lever, which extends through the through-hole to the outside of the clamp tube.

[0010] As a preferred embodiment of the present invention, the translation mechanism includes a fine adjustment slide and a connecting plate. The fine adjustment slide includes a base, a fine adjustment slide rod, and a connecting seat. The base is disposed on the upper end of the support, the fine adjustment slide rod is threadedly connected to the base, and the fine adjustment slide rod is rotatably connected to the connecting seat.

[0011] As a preferred embodiment of the present invention, the connecting plate includes a linear ball bearing guide rail and a sliding plate body. The linear ball bearing guide rail is disposed on the bracket and located on the side of the base, and the sliding plate body is slidably connected to the linear ball bearing guide rail.

[0012] In a preferred embodiment of the present invention, the connecting seat is connected to the sliding plate.

[0013] As a preferred embodiment of the present invention, the force sensor is mounted on the sliding plate.

[0014] As a preferred embodiment of the present invention, the lifting slide includes a scissor lift platform and a platform rotating rod. Both the scissor lift platform and the platform rotating rod are located at the lower end of the support. The platform rotating rod is driven to the scissor lift platform for driving the scissor lift platform to lift.

[0015] As a preferred embodiment of the present invention, the testing fixture is detachably installed on a scissor lift platform.

[0016] A measurement method for measuring the center force of a torque motor using the above-mentioned measuring device includes the following steps:

[0017] S1: Place the torque motor on the test fixture with the ball facing upwards, and the through-hole in the ball clamp is located directly above the ball;

[0018] S2: Adjust the lifting slide to drive the torque motor to move upward, so that the ball enters the through opening;

[0019] S3: Use the ball-holding clamp head to clamp and tighten the ball, adjust the translation mechanism to drive the ball clamp to move, release the eccentric force generated when the ball-holding clamp head clamps the ball, until the force sensor's collected value is at its absolute minimum.

[0020] S4: After the eccentric force is released, the force sensor is reset to zero, the torque motor is started, and the force sensor collects the mid-position force for mid-position force measurement.

[0021] S5: After the mid-position force measurement is completed, the torque motor is turned off, the ball-holding clamp head releases its grip on the ball, and the lifting slide moves the torque motor downward.

[0022] The beneficial effects of this invention are reflected in:

[0023] 1. Stable structure: The combination of bracket, connecting plate and slide table ensures the overall rigidity and stability of the device.

[0024] 2. Flexible adjustment: The lifting slide and the fine adjustment slide can be adjusted in both directions, and the small ball and the small ball clamp in the product being tested can be quickly assembled and disassembled.

[0025] 3. High measurement accuracy: The mid-position force is measured by a high-precision force sensor. Before measurement, the position of the ball clamp is adjusted to effectively eliminate the influence of eccentric force and the weight of the ball clamp, thus reducing the impact of eccentric force and weight on the subsequent mid-position force measurement.

[0026] 4. Good repeatability: small test error, simple operation, suitable for precise testing in the production and debugging of servo valves. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the torque motor mid-position force measuring device of the present invention;

[0028] Figure 2 This is a schematic diagram of the ball clamp structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the ball clamp structure of the present invention, including the ball-holding clamp head and other parts;

[0030] Figure 4 This is an exploded view of the ball clamp structure of the present invention.

[0031] In the diagram: 1. Bracket; 2. Test fixture; 3. Lifting slide; 3-1. Platform rotary rod; 4. Fine adjustment slide; 4-1. Fine adjustment slide rotary rod; 5. Connecting plate; 6. Force sensor; 7. Ball clamp; 7-1. Clamp tube; 7-2. First ball-holding chuck; 7-3. Second ball-holding chuck; 7-4. Double-ended screw; 7-5. Resin screw; 7-6. Lever. Detailed Implementation

[0032] The invention will now be described in further detail with reference to the accompanying drawings.

[0033] Combined with appendix Figure 1-4 As shown, a measuring device for the neutral force of a torque motor includes a bracket 1, a testing fixture 2, a lifting slide 3, a platform rotary rod 3-1, a fine adjustment slide 4, a fine adjustment slide rotary rod 4-1, a connecting plate 5, a force sensor 6, a small ball clamp 7, a clamp tube 7-1, a first ball-holding chuck 7-2, a second ball-holding chuck 7-3, a double-ended screw 7-4, a resin screw 7-5, and a lever 7-6.

[0034] Combined with appendix Figure 1-4 As shown, a measuring device for the mid-force of a torque motor includes: a bracket 1, a testing fixture, a lifting slide 3, a translation mechanism, a force sensor 6, and a ball clamp 7. Preferably, the bracket 1 has an L-shaped structure. The lifting slide 3 is located at the lower end of the bracket 1, and the translation mechanism is located at the upper end of the bracket 1. Preferably, the lifting slide 3 is located at the bottom edge of the L-shaped structure of the bracket 1, and the translation mechanism is located at the top edge of the vertical edge of the L-shaped structure of the bracket 1. The testing fixture is detachably mounted on the lifting slide 3 and is driven by the lifting slide 3 to move vertically. The force sensor 6 is mounted on the translation mechanism and is driven by the translation mechanism to move horizontally. The ball clamp 7 is mounted on the force sensor 6. The torque motor A is mounted on the testing fixture. Preferably, the torque motor A is mounted on the testing fixture by screws. When it needs to be removed, the torque motor A is removed from the testing fixture by removing the screws. The testing fixture has a U-shaped structure.

[0035] Combined with appendix Figure 1-4As shown, the ball clamp 7 includes a clamp tube 7-1 with a vertical through-hole in the middle, a ball-holding clamp head located in the clamp tube 7-1, and a double-ended screw 7-4 installed at one end of the clamp tube 7-1 for connecting the force sensor 6. The ball-holding clamp head includes a first ball-holding clamp 7-2 and a second ball-holding clamp 7-3. The second ball-holding clamp 7-3 is installed inside the clamp tube 7-1. Preferably, the second ball-holding clamp 7-3 abuts against the double-ended screw 7-4. The first ball-holding clamp 7-2 is slidably connected inside the clamp tube 7-1 and moves closer to or away from the second ball-holding clamp 7-3. The position where the first ball-holding clamp 7-2 and the second ball-holding clamp 7-3 are close to each other is located at the through-hole. The ball clamp 7 also includes a resin screw 7-5, the resin screw 7-5 being threaded. A lever 7-6 is provided on the first ball-holding chuck 7-2, which is connected to the end of the clamp tube 7-1 away from the double-ended screw 7-4. The lever 7-6 extends through the through-hole to the outside of the clamp tube 7-1. Preferably, the clamp tube 7-1, the first ball-holding chuck 7-2, the second ball-holding chuck 7-3, and the double-ended screw 7-4 are all made of aluminum alloy, and the resin screw 7-5 is made of resin. By rotating the resin screw 7-5, a resisting force is applied to the first ball-holding chuck 7-2. Because aluminum alloy and resin materials are used respectively, the overall structure of the ball clamp 7 is lightweight, reducing the impact of its own weight. By providing the lever 7-6, it is convenient to push the first ball-holding chuck 7-2. The first ball-holding chuck 7-2 and the second ball-holding chuck 7-3 are both hemispherical notches at their close ends.

[0036] The test fixture 2 drives the torque motor A to move vertically in a direction perpendicular to the direction the force sensor 6 drives the ball clamp 7 to move horizontally. The through-hole can move directly above the ball B of the torque motor A. The first ball-holding chuck 7-2 moves closer to the second ball-holding chuck 7-3 to clamp the ball B of the torque motor A. The first ball-holding chuck 7-2 is provided with a resistance force by rotating the resin screw 7-5, allowing it to clamp the ball B closer to the second ball-holding chuck 7-3. The resin screw 7-5 clamps and holds the ball B. Taking the direction of the first ball-holding chuck 7-2 moving closer to or further away from the second ball-holding chuck 7-3 as the x-axis, the translational movement direction of the ball clamp 7 is the x-axis direction, and the lifting and lowering movement direction of the test fixture driven by the torque motor A is the z-axis direction. After the torque motor A is placed on the test fixture, the torque motor A causes the ball B to swing in the x-axis direction, and the through-hole is through in the z-axis direction. After the test fixture, torque motor A, and ball clamp 7 are installed, the through-hole is located directly above the ball B so that there is no deviation in the y-axis direction.

[0037] Specifically:

[0038] The translation mechanism includes a fine-adjustment slide 4 and a connecting plate 5. The fine-adjustment slide 4 includes a base, a fine-adjustment slide rod 4-1, and a connecting seat. The base is disposed on the upper end of the support 1. The fine-adjustment slide rod 4-1 is threadedly connected to the base and rotatably connected to the connecting seat. The connecting plate 5 includes a linear ball bearing guide rail and a sliding plate body. The linear ball bearing guide rail is disposed on the support 1 and located on the side of the base. The sliding plate body is slidably connected to the linear ball bearing guide rail. The linear ball bearing guide rail moves along the x-axis. The connecting seat and the sliding plate body... The force sensor 6 is mounted on the sliding plate. The fit between the fine adjustment slide rod 4-1, the base, and the connecting seat is the same as that of a micrometer. The distance between the screw threads is used to achieve fine adjustment of the distance by rotating the slide rod. By setting the fine adjustment slide rod 4-1, in conjunction with the base and the connecting seat, the sliding plate and the linear ball guide rail can be used to achieve fine adjustment of the sliding plate along the x-axis. This, in turn, enables fine adjustment of the force sensor 6 and the ball clamp 7 in the x-axis direction. The force sensor 6 is a high-precision force sensor used to collect force in the x-axis direction.

[0039] The lifting slide 3 includes a scissor lift platform and a platform rotating rod 3-1. Both the scissor lift platform and the platform rotating rod 3-1 are located at the lower end of the bracket 1. The platform rotating rod 3-1 is driven by the scissor lift platform to drive it to lift. The test fixture is detachably installed on the scissor lift platform. The scissor lift platform includes a scissor cross arm, a platform body, and a threaded seat that cooperates with the platform rotating rod 3-1. The threaded seat is connected to the end of the scissor cross arm away from the platform rotating rod 3-1 and is slidably connected to the bracket 1. The platform rotating rod 3-1 is threadedly connected to the threaded seat. By rotating the platform rotating rod 3-1, the threaded seat is moved. Under the action of the scissor cross arm, the platform body is adjusted to lift, thereby achieving the lifting of the lifting slide 3, which in turn allows the test fixture and torque motor A to lift.

[0040] A measurement method for measuring the center force of a torque motor using the above-mentioned measuring device includes the following steps:

[0041] S1: Place the torque motor A on the test fixture with the ball B facing upwards, and the through-hole in the ball clamp 7 is located directly above the ball B;

[0042] Specifically, the test fixture is mounted on the bracket 1, the ball clamp 7 is connected to the force sensor 6, and the torque motor A is placed on the test fixture with the ball B facing upwards. The through-hole on the ball clamp 7 is located directly above the ball B, without any deviation in the y-axis direction. Preferably, the ball B has a spherical structure in the x-axis direction and a flat structure in the y-axis direction. The diameter of the ball B in the spherical structure direction ranges from 1.4mm to 1.8mm, preferably 1.6mm. The thickness of the ball B in the flat structure direction ranges from 0.4mm to 0.8mm, preferably 0.6mm. The length of the feedback rod corresponding to ball B is in the range of 20mm-30mm, preferably 25mm. Correspondingly, the length of the vertical side of the L-shaped structure of bracket 1 is in the range of 150mm-250mm, preferably 200mm. The length of the bottom side of the L-shaped structure of bracket 1 is in the range of 110mm-160mm, preferably 130mm. The distance between the plane where the bottom side of the lifting slide 3 is installed at the lower end of the L-shaped structure of bracket 1 and the plane where the translation mechanism is installed at the upper end of the L-shaped structure of bracket 1 is in the range of 120mm-180mm, preferably 150mm.

[0043] S2: Adjust the lifting slide 3 to drive the torque motor A to move upward, so that the ball B enters the through opening;

[0044] S3: Use the ball-holding clamp head to clamp the ball B, adjust the translation mechanism to drive the ball clamp 7 to move, release the eccentric force generated when the ball-holding clamp head clamps the ball B, until the force sensor 6 collects the absolute minimum value.

[0045] Specifically:

[0046] The ball B is clamped using the ball-holding clamp head, wherein the clamping direction is along the x-axis. The translation mechanism is adjusted to move the ball clamp 7, releasing the eccentric force generated when the ball-holding clamp head clamps the ball B. The eccentric force is the x-axis eccentric force generated when the first ball-holding clamp 7-2 and the second ball-holding clamp 7-3 are pushed to clamp the ball B, until the force sensor 6 collects the absolute minimum value. Since the eccentric force generated by clamping is released before the formal test, the influence of the eccentric force and the weight of the ball clamp 7 is reduced.

[0047] S4: After the eccentric force is released, the force sensor 6 is reset to zero, the torque motor A is started, and the force sensor 6 collects the mid-position force for mid-position force measurement. During mid-position force measurement, the torque motor A drives the ball B to swing in the x-axis direction.

[0048] S5: After the mid-force measurement is completed, the torque motor A is turned off, the ball-holding clamp head releases its grip on the small ball B, and the lifting slide 3 drives the torque motor A to move downward. By removing the screws that install the torque motor A, the torque motor A is separated from the test fixture so that other torque motors A can be replaced for testing.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A measuring device for the neutral force of a torque motor, characterized in that, include: The bracket (1), testing fixture, lifting slide (3), translation mechanism, force sensor (6), and ball clamp (7) are included. The lifting slide (3) is located at the lower end of the bracket (1), the translation mechanism is located at the upper end of the bracket (1), the test fixture is detachably installed on the lifting slide (3) and is driven by the lifting slide (3) to move vertically, the force sensor (6) is installed on the translation mechanism and is driven by the translation mechanism to move horizontally, the ball clamp (7) is installed on the force sensor (6), and the torque motor is installed on the test fixture (2); The ball clamp (7) includes a clamp tube (7-1) with a vertical through-hole in the middle, a ball-holding clamp head located in the clamp tube (7-1), and a double-ended screw (7-4) installed at one end of the clamp tube (7-1) for connecting the force sensor (6). The ball-holding clamp head includes a first ball-holding clamp (7-2) and a second ball-holding clamp (7-3). The second ball-holding clamp (7-3) is installed inside the clamp tube (7-1). The first ball-holding clamp (7-2) is slidably connected inside the clamp tube (7-1) and moves closer to or further away from the second ball-holding clamp (7-3). The first ball-holding clamp (7-2) and the second ball-holding clamp (7-3) are located close to each other at the through-hole. The test fixture (2) drives the torque motor to move up and down in a direction perpendicular to the direction of the force sensor (6) driving the ball clamp (7) to move in a translational direction. The through-hole can move to directly above the ball of the torque motor. The first ball-holding clamp (7-2) moves closer to the second ball-holding clamp (7-3) to clamp the ball of the torque motor.

2. The measuring device for the neutral force of a torque motor according to claim 1, characterized in that: The ball clamp (7) also includes a resin screw (7-5), which is threaded to the end of the clamp tube (7-1) away from the double-ended screw (7-4).

3. The measuring device for the neutral force of a torque motor according to claim 1, characterized in that: The first ball-holding chuck (7-2) is provided with a lever (7-6), which extends through the through-hole to the outside of the clamp tube (7-1).

4. The measuring device for the neutral force of a torque motor according to claim 1, characterized in that: The translation mechanism includes a fine adjustment slide (4) and a connecting plate (5). The fine adjustment slide (4) includes a base, a fine adjustment slide rod (4-1), and a connecting seat. The base is located on the upper end of the bracket (1). The fine adjustment slide rod (4-1) is threadedly connected to the base. The fine adjustment slide rod (4-1) is rotatably connected to the connecting seat.

5. The measuring device for the neutral force of a torque motor according to claim 4, characterized in that: The connecting plate (5) includes a linear ball guide rail and a sliding plate body. The linear ball guide rail is mounted on the bracket (1) and located on the side of the base. The sliding plate body is slidably connected to the linear ball guide rail.

6. The measuring device for the neutral force of a torque motor according to claim 5, characterized in that: The connecting seat is connected to the sliding plate.

7. The measuring device for the neutral force of a torque motor according to claim 5, characterized in that: The force sensor (6) is mounted on the sliding plate.

8. The measuring device for the neutral force of a torque motor according to claim 1, characterized in that: The lifting slide (3) includes a scissor lift platform and a platform swivel (3-1). The scissor lift platform and the platform swivel (3-1) are both located at the lower end of the bracket (1). The platform swivel (3-1) is driven to connect with the scissor lift platform to drive the scissor lift platform to lift.

9. A measuring device for the neutral force of a torque motor according to claim 8, characterized in that: The test fixture can be detachably installed on the scissor lift platform.

10. A method for measuring the center force of a torque motor using the measuring device for center force of a torque motor as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Place the torque motor on the test fixture with the ball facing upwards, and the through-hole in the ball clamp (7) is located directly above the ball; S2: Adjust the lifting slide (3) to drive the torque motor to move upward, so that the ball enters the through hole; S3: Use the ball-holding clamp head to clamp the ball, adjust the translation mechanism to drive the ball clamp (7) to move, release the eccentric force generated when the ball-holding clamp head clamps the ball, until the force sensor (6) collects the absolute minimum value; S4: After the eccentric force is released, the force sensor (6) is reset to zero, the torque motor is started, and the force sensor (6) collects the mid-position force for mid-position force measurement. S5: After the mid-position force measurement is completed, the torque motor is turned off, the ball-holding clamp head releases its grip on the ball, and the lifting slide (3) drives the torque motor to move downward.

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