Load mechanism piston rod movement clearance and load force measuring device and method

Abstract

The present application belongs to the field of load mechanism detection, and relates to a kind of load mechanism piston rod movement gap and load force measuring device and method.The base of the device is provided with a boss with U-shaped arc surface, which clamps the load mechanism together with a pressing cover plate also with U-shaped arc surface.The piston rod of the load mechanism is connected with a force value sensor and a back-shaped joint.The back-shaped contact block is buckled with the back-shaped joint.The back-shaped contact block is connected with a screw rod with a handle, and rotating the screw rod with the handle moves the back-shaped contact block, and then realizes the extension and contraction of the piston rod.The displacement of the telescopic rod is measured by a dial gauge cooperating with a baffle fixed on the force value sensor.The present application replaces manual measurement, reduces errors, and the measurement accuracy can reach 0.01mm and 0.1N respectively.The present application is suitable for different specifications of load mechanism, realizes the simultaneous detection of the piston rod movement gap and load force, reduces the number and types of detection tools, improves work efficiency, reduces cost, and shortens detection time.

Description

Technical Field

[0001] This invention belongs to the field of load mechanism testing, and relates to a device and method for measuring the movement clearance and load force of a piston rod in a load mechanism. It is applied to the measurement of the transition clearance and load force during the reciprocating motion of the piston rod inside the load mechanism. Background Technology

[0002] As a control and transmission component, the load mechanism is characterized by its variety of types, varying stroke ranges, and different force parameters. In practical applications, it faces extremely stringent performance requirements. The reciprocating clearance and load force of the load mechanism's piston rod are crucial performance indicators. If the piston rod reciprocating clearance is too large, or the load force exceeds the limit, the sensitivity of the control system will decrease, affecting control quality and even operational safety. Therefore, accurately measuring the piston rod reciprocating clearance and load force of the load mechanism is essential.

[0003] Previous measurement methods used a fixed dial indicator and manually pulled / pressed the piston rod to check the reciprocating clearance and load force. However, due to the large force value of the load mechanism, manual pulling / pressing caused unstable force values, making it impossible to pull / press at a uniform speed. The unstable movement of the piston rod led to inaccurate test data and measurement errors. Summary of the Invention

[0004] In view of the above reasons, the present invention provides a device and method for measuring the piston rod movement clearance and load force of a load mechanism. By using mechanical transmission, the difficulty of operation is reduced, the universality is increased, and it can be quickly mastered. The device mainly uses components such as handwheel screw, force sensor, dial indicator, tension and compression joint, which reduces the error generated during the measurement process and makes up for the shortcomings of difficult to guarantee the accuracy of test indicators and long test time, thus greatly improving the accuracy and efficiency of measurement work.

[0005] This invention uses a handwheel and lead screw transmission method to test the change in the load mechanism's return to a neutral position after working in a tensile / compressive state. A sensor is used to measure the change in force during the piston rod's movement, thereby determining the piston rod's reciprocating clearance and load stability. This device can simultaneously measure the reciprocating clearance and load force of the tensile / compressive piston rod of the load mechanism, eliminating human error and errors caused by vernier calipers. During the test, the position of the test bench fixture can be adjusted according to different lengths of the load mechanism, increasing the interchangeability, practicality, and operability of the test device. This streamlines and simplifies the entire test process, greatly improving the testing quality. It avoids quality risks during operation, improves work efficiency, and solves the difficulties in measuring the reciprocating clearance and load force of the load mechanism's piston rod to the greatest extent. Compared with previous testing methods, this method, through lead screw transmission, reduces frictional losses during measurement. By using a dial indicator and force sensor to test the piston rod's extension and retraction offset and force load, it achieves higher accuracy and stronger comprehensiveness.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A device for measuring the movement clearance and load force of a piston rod in a load mechanism, the measuring device comprising a base 1, a clamping cover plate 2, a fastening sleeve 3, a connecting shaft 4, a support plate 5, a lead screw with a crank handle 6, a U-shaped contact block 7, a U-shaped connector 8, a fastening nut 9, a force sensor 10, a baffle 11, a support column 12, a dial indicator 13, a slotted screw 14, a clamping and fixing plate 15, a scale 16, a crank handle 17, and a force display 18.

[0008] The base 1 is a strip-shaped plate structure, which is clamped onto a vise by a clamping plate 15 fixed to its lower surface to provide stable support for the entire measuring device. A boss is provided at the front end of its upper surface, and a U-shaped arc surface is formed on the upper surface of the boss. The axis of the U-shaped arc surface is parallel to the axis of the length direction of the base 1. The lower surface of the clamping cover plate 2 is also formed with a U-shaped arc surface. It is placed on the base 1, and the U-shaped arc surfaces of the two are opposite each other to clamp the measured load mechanism. One side of the clamping cover plate 2 is connected to the base 1 through a connecting shaft 4, and it can rotate freely around the connecting shaft 4 to open and close. A fastening sleeve 3 is provided on the other side of the clamping cover plate 2. The measured load mechanism is fastened by the fastening sleeve 3 cooperating with the base 1. After fastening, the piston rod axis of the measured load mechanism coincides with the axis of the U-shaped arc surface of the base 1 and the clamping cover plate 2. A crank handle 17 is provided at the top of the fastening sleeve 3 for turning the fastening sleeve 3.

[0009] The support plate 5 is fixed to the rear end of the upper surface of the base 1, and has a threaded through hole at its upper part. The crank screw 6 is screwed into the threaded through hole of the support plate 5 from the rear side, and rotates in and out under the support of the support plate 5. Its front end is connected to the U-shaped contact block 7 through a rotary bearing. The U-shaped contact block 7 is U-shaped and moves back and forth by rotating the crank screw 6. The front end of the U-shaped connector 8 is fixedly connected to the force sensor 10. The front end of the force sensor 10 is fixedly connected to the rear end of the piston rod through a fastening nut 9. The U-shaped connector 8 is also U-shaped, and its opening direction is perpendicular to the opening direction of the U-shaped contact block 7. The two are interlocked, so that the U-shaped connector 8 can move back and forth under the action of the U-shaped contact block 7. It is used to transmit load force during the pulling / pressing movement of the crank screw 6. By moving the U-shaped contact block 7 back and forth, the piston rod is driven to extend and retract, realizing the action of gap and load force measurement.

[0010] The width of the U-shaped opening of the U-shaped contact block 7 is greater than the width of the U-shaped opening of the U-shaped connector 8. The front end face of the U-shaped contact block 7 is surface C, the inner front end face of its U-shaped opening is surface A, the inner front end face of the U-shaped connector 8 is surface D, and the inner rear end face of its U-shaped opening is surface B. When the piston rod is in the initial position, the U-shaped contact block 7 and the U-shaped connector 8 are not in contact. When the piston rod is stretched, surface A and surface B are in contact. When the piston rod is compressed, surface C and surface D are in contact.

[0011] The baffle 11 is fixed to the force sensor 10, and is arranged vertically and synchronized with the extension and retraction of the piston rod. The support column 12 is fixedly connected to the base 1, and has a through hole at its upper end. The dial indicator 13 passes through the through hole and is fixed by a slotted screw 14. Its top rod rests on the baffle 11 and is used to measure the extension and retraction displacement of the piston rod. The scale 16 is fixed to the upper surface of the base 1 along the length of the base 1 and is used to cooperate with the baffle 11 to determine the movement position of the piston rod. The baffle 11 compresses the top rod of the dial indicator 13 during the extension and retraction of the piston rod, thereby realizing the gap measurement. At the same time, the scale 16 and the baffle 11 correspond to each other, which can determine the movement position of the piston rod.

[0012] The force display 18 is connected to the force sensor 10 and is used to accurately read the load force at any position of the piston rod in tension / compression.

[0013] Furthermore, for load mechanisms of different diameters, by replacing the fastening sleeves 3 and connecting shafts 4 of different specifications, the piston rod axis of the load mechanism of different specifications is made to coincide with the U-shaped arc surface of the base 1 and the U-shaped arc surface axis of the pressure cover plate 2.

[0014] A method for measuring the clearance and load force of a piston rod in a load mechanism, implemented using the aforementioned measuring device, comprises the following steps:

[0015] Step 1, Preparation before measurement:

[0016] 1.1 Install the measuring device as a whole on the vise, and clamp the clamping and fixing plate 15 below the base 1 with the vise;

[0017] 1.2 Screw the U-shaped connector 8 onto the force sensor 10, and then screw them together onto the piston rod of the load being measured. Secure them with the fastening nut 9 to ensure that the U-shaped connector 8, the force sensor 10, and the piston rod of the load being measured are reliably fixed without any looseness.

[0018] 1.3 Place the load mechanism to be measured in the U-shaped arc surface of the base 1, adjust the position of the load mechanism, or rotate the screw with crank handle 6 to adjust the position of the return contact block 7, ultimately ensuring that the U-shaped opening of the return connector 8 is engaged in the U-shaped opening of the return contact block 7 and that the two do not contact each other. After adjusting the position, close the clamping cover plate 2 and rotate the crank handle 17 to fix the load mechanism to be measured in the U-shaped arc surface of the base 1 and the clamping cover plate 2 through the fastening sleeve 3, ensuring that it is firm and does not loosen;

[0019] 1.4 Fix the baffle 11 to the force sensor 10, insert the dial indicator 13 rod into the hole of the support column 12, ensure that the push rod is against the baffle 11 and in a compressed state, and the compression amount is >5mm, and then use the slotted screw 14 to fix the dial indicator 13 to the support column 12 to ensure that it is firm and does not loosen.

[0020] Step 2, Measurement of clearance or force value of the load mechanism:

[0021] When measuring the clearance of the load mechanism:

[0022] 2.1 After completing the pre-measurement preparations, rotate the screw 6 with the crank handle to drive the loop contact block 7 to move in the stretching direction. During the stretching process, the A surface of the loop contact block 7 contacts the B surface of the loop connector 8 and drives the power value sensor 10 to stretch the piston rod of the measured load mechanism. The stretching stroke stops when it reaches 10±1mm.

[0023] 2.2 Rotate the screw 6 with the crank handle in the opposite direction to drive the loop contact block 7 to move in the compression direction until the A surface of the loop contact block 7 separates from the B surface of the loop connector 8. Record the reading n1 of the dial indicator 13 at this time.

[0024] 2.3 Continue to rotate the crank screw 6 in the same direction as in the previous step, so that it drives the loop contact block 7 to move in the compression direction. During the compression process, the C surface of the loop contact block 7 contacts the D surface of the loop connector 8 and drives the power value sensor 10 to compress the piston rod of the measured load mechanism. Stop when the compression stroke is 10±1mm.

[0025] 2.4 Rotate the screw 6 with the crank handle in the opposite direction to the previous step, so that it drives the loop contact block 7 to move in the stretching direction until the C surface of the loop contact block 7 separates from the D surface of the loop connector 8. Record the reading n2 of the dial indicator 13 at this time.

[0026] 2.5 Calculate the clearance Δn of the measured load mechanism.

[0027] Load mechanism force measurement includes compressive load force measurement and tensile load force measurement, specifically:

[0028] When measuring tensile load:

[0029] After completing the pre-measurement preparations, rotate the crank screw 6 to drive the loop contact block 7 to move in the stretching direction. During the stretching process, the A surface of the loop contact block 7 contacts the B surface of the loop connector 8 and drives the power value sensor 10 to stretch the piston rod of the measured load mechanism. Read the corresponding stretching stroke L1 on the scale 16 as required. Stop rotating the crank screw 6 and read the load force value F1 on the force value display 18 at this time. This load force value is the load force of the measured load mechanism at stroke L1.

[0030] When measuring compressive load force:

[0031] After completing the pre-measurement preparations, rotate the crank screw 6 to drive the loop contact block 7 to move in the compression direction. During the compression process, the C surface of the loop contact block 7 contacts the D surface of the loop connector 8 and drives the power value sensor 10 to compress the piston rod of the measured load mechanism. Read the corresponding tensile stroke L2 on the scale 16 as required. Stop rotating the crank screw 6 and read the load force value F2 on the force value display 18 at this time. This load force value is the load force of the measured load mechanism at stroke L2.

[0032] Step 3, After measurement, organize the data:

[0033] 3.1 After completing the measurement, loosen the fastening handle 3 to open the pressure cover 2, remove the measured load mechanism, loosen the fastening nut 9 to remove the force sensor 10 and the return connector 8;

[0034] 3.2 To measure the next load mechanism, follow steps 1 to 2. Once the operation is complete, remove the measuring device from the vise.

[0035] The beneficial effects of this invention are:

[0036] (1) The measurement method of the present invention is simple and easy to operate. The device replaces manual pulling and pressing and the traditional measurement methods of vernier calipers, tape measures, force gauges and visual inspection, which reduces the error caused by unsuitable measuring tools and human factors. It is more conducive to measuring the piston movement clearance and load force of the load mechanism, improving the practicality and scientificity, and making the measurement results more accurate. The accuracy of measuring clearance and load force can reach 0.01mm and 0.1N, respectively.

[0037] (2) This measuring device has a quick change function. For different specifications of the measured products, the center of the piston rod is located in the U-shaped groove of the base 1 and the U-shaped groove of the clamping cover plate 2. Only the fastening sleeve 3 and the connecting shaft 4 need to be adjusted to clamp the measured load mechanism, so as to adapt to the measured load mechanism of various diameter specifications.

[0038] (3) This measuring device can simultaneously detect the piston rod movement clearance and load force of the load mechanism. During the detection process, the corresponding relationship between the load mechanism force value and the piston rod movement clearance can be comprehensively judged, which can assist technicians in product fault analysis and improve the overall performance of the product.

[0039] (4) This invention belongs to integrated testing, which reduces the number and types of testing fixtures used. A single fixture can perform two performance tests, reducing the number of clamping preparations, reducing the difficulty of operation, greatly improving work efficiency, reducing fixture costs, and shortening the time for load mechanism testing. Attached Figure Description

[0040] Figure 1 This is a three-dimensional isometric view of the measuring device.

[0041] Figure 2 This is the front view of the measuring device.

[0042] Figure 3 This is a partial view of the measuring device.

[0043] In the diagram: 1. Base; 2. Pressing cover plate; 3. Fastening sleeve; 4. Connecting shaft; 5. Support plate; 6. Lead screw with crank handle; 7. Recurved contact block; 8. Recurved connector; 9. Fastening nut; 10. Force sensor; 11. Baffle; 12. Support column; 13. Dial indicator; 14. Slotted screw; 15. Clamping and fixing plate; 16. Scale; 17. Crank handle; 18. Force display. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will now be described in detail with reference to the accompanying drawings.

[0045] A device for measuring the clearance and load force of a piston rod in a load mechanism, the measuring device comprising a base 1, a clamping cover plate 2, a fastening sleeve 3, a connecting shaft 4, a support plate 5, a lead screw with a crank handle 6, a U-shaped contact block 7, a U-shaped connector 8, a fastening nut 9, a force sensor 10, a baffle 11, a support column 12, a dial indicator 13, a slotted screw 14, a clamping and fixing plate 15, a scale 16, a crank handle 17, and a force display 18. Figure 1 and Figure 2 As shown.

[0046] The base 1 is a strip-shaped plate structure, clamped to a vise by a clamping plate 15 fixed to its lower surface, providing stable support for the entire measuring device. A boss is provided at the front end of its upper surface, with a U-shaped arc surface on the upper surface of the boss. The axis of the U-shaped arc surface is parallel to the axis of the base 1. The lower surface of the clamping cover plate 2 also has a U-shaped arc surface and is placed on the base 1, with the U-shaped arc surfaces of the two facing each other, used to clamp the measured load mechanism. One side of the clamping cover plate 2 is connected to the base 1 via a connecting shaft 4, and it can rotate freely around the connecting shaft 4 to open and close. A fastening sleeve 3 is provided on the other side of the clamping cover plate 2. The fastening sleeve 3 cooperates with the base 1 to secure the measured load mechanism. After securing, the piston rod axis of the measured load mechanism coincides with the axis of the U-shaped arc surface of the base 1 and the clamping cover plate 2. A crank handle 17 is provided at the top of the fastening sleeve 3 for turning the fastening sleeve 3. The support plate 5 is secured by bolts. The rear end of the base 1 is fixed to the upper surface and has a threaded through hole at its upper part. The crank screw 6 is screwed into the threaded through hole of the support plate 5 from the rear side and rotates in and out under the support of the support plate 5. Its front end is connected to the U-shaped contact block 7 through a rotary bearing. The U-shaped contact block 7 is U-shaped and moves back and forth by rotating the crank screw 6. The front end of the U-shaped connector 8 is fixedly connected to the force sensor 10 by a fastening bolt. The front end of the force sensor 10 is fixedly connected to the rear end of the piston rod by a fastening nut 9. The U-shaped connector 8 is also U-shaped, and its opening direction is perpendicular to the opening direction of the U-shaped contact block 7. The two are interlocked so that the U-shaped connector 8 can move back and forth under the action of the U-shaped contact block 7. It is used to transmit load force during the pulling / pressing movement of the crank screw 6. By moving the U-shaped contact block 7 back and forth, the piston rod is driven to extend and retract, realizing the action of gap and load force measurement.

[0047] The U-shaped opening width of the U-shaped contact block 7 is greater than that of the U-shaped connector 8. The front end face of the U-shaped contact block 7 is face C, and the inner front end face of its U-shaped opening is face A. The inner front end face of the U-shaped connector 8 is face D, and the inner rear end face of its U-shaped opening is face B. When the piston rod is in the initial position, the U-shaped contact block 7 and the U-shaped connector 8 are not in contact. When the piston rod is stretched, face A and face B are in contact. When the piston rod is compressed, face C and face D are in contact. Figure 3 As shown.

[0048] The baffle 11 is fixed to the force sensor 10 by screws, and is arranged vertically and synchronized with the extension and retraction of the piston rod. The support column 12 is fixedly connected to the base 1, and has a through hole at its upper end. The dial indicator 13 passes through the through hole and is fixed by a slotted screw 14. Its top rod rests on the baffle 11 to measure the extension and retraction displacement of the piston rod. The scale 16 is fixed to the upper surface of the base 1 along the length of the base 1 and is used to cooperate with the baffle 11 to determine the movement position of the piston rod. The baffle 11 compresses the top rod of the dial indicator 13 during the extension and retraction of the piston rod, thereby realizing the gap measurement. At the same time, the scale 16 and the baffle 11 correspond to each other, which can determine the movement position of the piston rod.

[0049] The force display 18 is connected to the force sensor 10 and is used to accurately read the load force at any position of the piston rod in tension / compression.

[0050] Furthermore, for load mechanisms of different diameters, by replacing the fastening sleeves 3 and connecting shafts 4 of different specifications, the piston rod axis of the load mechanism of different specifications is made to coincide with the U-shaped arc surface of the base 1 and the U-shaped arc surface axis of the pressure cover plate 2.

[0051] A method for measuring the clearance and load force of a piston rod in a load mechanism, implemented using the aforementioned measuring device, comprises the following steps:

[0052] Step 1, Preparation before measurement:

[0053] 1.1 Install the measuring device as a whole on the vise, and clamp the clamping and fixing plate 15 below the base 1 with the vise;

[0054] 1.2 Screw the U-shaped connector 8 onto the force sensor 10, and then screw them together onto the piston rod of the load being measured. Secure them with the fastening nut 9 to ensure that the U-shaped connector 8, the force sensor 10, and the piston rod of the load being measured are reliably fixed without any looseness.

[0055] 1.3 Place the load mechanism to be measured in the U-shaped arc surface of the base 1, adjust the position of the load mechanism to ensure that the U-shaped opening of the return joint 8 is engaged in the U-shaped opening of the return contact block 7 and that the two do not contact each other. After adjusting the position, close the clamping cover plate 2 and turn the crank handle 17 to fix the load mechanism to be measured in the U-shaped arc surface of the base 1 and the clamping cover plate 2 through the fastening sleeve 3, ensuring that it is firm and does not loosen;

[0056] 1.4 Fix the baffle 11 to the force sensor 10 with a cross-slot screw. Insert the dial indicator 13 rod into the hole of the support column 12 to ensure that the push rod is on the baffle 11 and in a compressed state, and the compression amount is >5mm. Then fix the dial indicator 13 to the support column 12 with a slotted screw 14 to ensure that it is firm and does not loosen.

[0057] Step 2, measure the clearance of the load mechanism:

[0058] 2.1 After completing the pre-measurement preparations, first rotate the screw 6 with the crank handle counterclockwise to drive the loop contact block 7 to move in the stretching direction. During the stretching process, the A surface of the loop contact block 7 contacts the B surface of the loop connector 8 and drives the power value sensor 10 to stretch the piston rod of the measured load mechanism. Stop when the stretching stroke is 10±1mm.

[0059] 2.2 Rotate the screw 6 with the crank handle clockwise to drive the loop contact block 7 to move in the compression direction until the A side of the loop contact block 7 separates from the B side of the loop connector 8. Record the reading n1 of the dial indicator 13 at this time.

[0060] 2.3 Continue to rotate the screw 6 with the crank handle clockwise, so that it drives the loop contact block 7 to move in the compression direction. During the compression process, the C surface of the loop contact block 7 contacts the D surface of the loop connector 8 and drives the power value sensor 10 to compress the piston rod of the measured load mechanism. The compression stroke stops when it reaches 10±1mm.

[0061] 2.4 Rotate the screw 6 with the crank handle counterclockwise to make it move the loop contact block 7 in the stretching direction until the C surface of the loop contact block 7 separates from the D surface of the loop connector 8. Record the reading n2 of the dial indicator 13 at this time.

[0062] 2.5 Calculate the clearance Δn of the measured load mechanism.

[0063] Step 3, measure the load force values, including compressive load force and tensile load force, specifically:

[0064] 3.1 Measure the tensile load:

[0065] Return the measuring device to the pre-measurement preparation state, rotate the crank screw 6 counterclockwise to drive the loop contact block 7 to move in the stretching direction. During the stretching process, the A surface of the loop contact block 7 contacts the B surface of the loop connector 8 and drives the power value sensor 10 to stretch the piston rod of the measured load mechanism. Read the corresponding stretching stroke L1 on the scale 16 as required. Stop rotating the crank screw 6 and read the load force value F1 on the force value display 18 at this time. This load force value is the load force of the measured load mechanism at stroke L1.

[0066] 3.2 Measurement of compressive load force:

[0067] Return the measuring device to the pre-measurement preparation state, rotate the crank screw 6 clockwise to drive the loop contact block 7 to move in the compression direction. During the compression process, the C surface of the loop contact block 7 contacts the D surface of the loop connector 8 and drives the power value sensor 10 to compress the piston rod of the measured load mechanism. Read the corresponding tensile stroke L2 on the scale 16 as required. Stop rotating the crank screw 6 and read the load force value F2 on the force value display 18 at this time. This load force value is the load force of the measured load mechanism at stroke L2.

[0068] Step 4, After measurement, tidy up:

[0069] 4.1 After completing the measurement, loosen the fastening handle 3 to open the clamping cover 2, remove the measured load mechanism, loosen the fastening nut 9 to remove the force sensor 10 and the return connector 8;

[0070] 4.2 To measure the next load mechanism, follow steps 1 to 2. Once the operation is complete, remove the measuring device from the vise.

[0071] The above-described embodiments are merely illustrative of the implementation methods of the present invention, but should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A device for measuring the piston rod movement clearance and load force of a load mechanism, characterized in that, The measuring device includes a base (1), a pressing cover plate (2), a support plate (5), a screw with a crank handle (6), a loop contact block (7), a loop connector (8), a force sensor (10), a baffle (11), a support column (12), a dial indicator (13), a scale (16), and a force display (18). The base (1) is a strip-shaped plate structure with a boss at the front end of its upper surface. The upper surface of the boss is made of a U-shaped arc surface, and the axis of the U-shaped arc surface is parallel to the axis of the length direction of the base (1). The lower surface of the pressing cover plate (2) is also made of a U-shaped arc surface. It is placed on the base (1), and the U-shaped arc surfaces of the two are opposite to each other. It is used to clamp the measured load mechanism. One side of the pressing cover plate (2) is connected to the base (1) and can be opened and closed. The other side is detachably fastened to the base (1) for fastening the measured load mechanism. After fastening, the piston rod axis of the measured load mechanism coincides with the axis of the U-shaped arc surface of the base (1) and the pressing cover plate (2). The support plate (5) is fixed to the rear end of the upper surface of the base (1), and a threaded through hole is provided on its upper part; the screw with crank handle (6) is screwed into the threaded through hole of the support plate (5) from the rear side, and rotates in and out under the support of the support plate (5), and its front end is rotatably connected to the U-shaped contact block (7); the U-shaped contact block (7) is U-shaped, and moves back and forth by rotating in and out of the screw with crank handle (6); the front end of the U-shaped connector (8) is fixedly connected to the force sensor (10), the front end of the force sensor (10) is fixedly connected to the rear end of the piston rod, and the U-shaped connector (8) is also U-shaped, and its opening direction is perpendicular to the opening direction of the U-shaped contact block (7), and the two are interlocked, so that the U-shaped connector (8) can move back and forth under the drive of the U-shaped contact block (7), and is used to transmit load force during the pulling / pressing movement of the screw with crank handle (6); The U-shaped opening width of the U-shaped contact block (7) is greater than the U-shaped opening width of the U-shaped connector (8). When the piston rod is in the initial position, the U-shaped contact block (7) and the U-shaped connector (8) do not contact each other. The baffle (11) is fixed on the force sensor (10), and it is arranged vertically and synchronized with the extension and retraction of the piston rod; the support column (12) is fixedly connected to the base (1), and a through hole is provided at its upper end. The dial indicator (13) is inserted into the through hole and fixed, and its top rod rests on the baffle (11) to measure the extension and retraction displacement of the piston rod; the scale (16) is fixed on the upper surface of the base (1) along the length direction of the base (1) to cooperate with the baffle (11) to determine the movement position of the piston rod. The force display (18) is connected to the force sensor (10) to accurately read the load force at any position of the piston rod.

2. The device for measuring the piston rod movement clearance and load force of a load mechanism according to claim 1, characterized in that, The front end face of the U-shaped contact block (7) is surface C, the front end face inside the U-shaped opening is surface A, the front end face inside the U-shaped opening of the U-shaped connector (8) is surface D, and the rear end face inside the U-shaped opening is surface B. When the piston rod is stretched, surface A and surface B are in contact, and when the piston rod is compressed, surface C and surface D are in contact.

3. The device for measuring the piston rod movement clearance and load force of a load mechanism according to claim 1, characterized in that, The base (1) has a clamping plate (15) fixed on its lower surface for clamping the clamping device onto the vise.

4. The device for measuring the piston rod movement clearance and load force of a load mechanism according to claim 1, characterized in that, The pressing cover plate (2) is connected to the base (1) on one side via a connecting shaft (4), and it can rotate freely around the connecting shaft (4) to open and close. A fastening sleeve (3) is provided on the other side of the pressing cover plate (2). The measuring load mechanism is fastened by the cooperation between the fastening sleeve (3) and the base (1).

5. The device for measuring the piston rod movement clearance and load force of a load mechanism according to claim 4, characterized in that, The top of the fastening sleeve (3) is provided with a crank handle 17 for turning the fastening sleeve (3).

6. The device for measuring the piston rod movement clearance and load force of a load mechanism according to claim 4, characterized in that, For load mechanisms of different diameters, by replacing the fastening sleeve (3) and connecting shaft (4) of different specifications, the piston rod axis of the load mechanism of different specifications is made to coincide with the U-shaped arc surface of the base (1) and the U-shaped arc surface of the pressure cover plate (2).

7. The device for measuring the piston rod movement clearance and load force of a load mechanism according to claim 1, characterized in that, The dial indicator (13) is fixed to the support column (12) by a slotted screw (14).

8. A method for measuring the clearance and load force of a piston rod in a load mechanism, implemented using the measuring device described in any one of claims 1-7, characterized in that... The measurement method steps are as follows: Step 1, Preparation before measurement: 1.1 Mount the entire measuring device onto the vise; 1.2 Screw the U-shaped connector (8) onto the force sensor (10), and then fasten them together onto the piston rod of the load being measured; 1.3 Place the load mechanism to be measured in the U-shaped arc surface of the base (1), adjust the position of the load mechanism to be measured, or rotate the screw with crank handle (6) to adjust the position of the return contact block (7), and finally ensure that the U-shaped opening of the return connector (8) is fastened in the U-shaped opening of the return contact block (7) and the two do not contact each other; after adjusting the position, close the pressure cover plate (2) and fasten it to the base (1) to clamp the load mechanism to be measured; 1.4 Fix the baffle (11) on the force sensor (10), insert the dial indicator (13) rod into the hole of the support column (12), ensure that the push rod is on the baffle (11) and in a compressed state, and fix the dial indicator (13) on the support column (12); Step 2, Measurement of clearance or force value of the load mechanism: When measuring the clearance of the load mechanism: 2.1 After completing the pre-measurement preparations, rotate the screw with crank handle (6) to drive the return contact block (7) to move in the stretching direction. The return contact block (7) drives the power value sensor (10) through the return joint (8) to stretch the piston rod of the measured load mechanism. The stretching stroke stops when it reaches 10±1mm. 2.2 Rotate the screw (6) with the crank handle in the opposite direction to drive the loop contact block (7) to move in the compression direction until the loop contact block (7) and the loop connector (8) are no longer in contact. Record the reading n1 of the dial indicator (13) at this time. 2.3 Continue to rotate the crank screw (6) in the same direction as in the previous step, so that it drives the return contact block (7) to move in the compression direction. The return contact block (7) drives the power value sensor (10) through the return joint (8) to compress the piston rod of the measured load mechanism. Stop when the compression stroke is 10±1mm. 2.4 Rotate the screw with crank handle (6) in the opposite direction to the previous step, so that it drives the loop contact block (7) to move in the stretching direction until the loop contact block (7) and the loop connector (8) are no longer in contact. Record the reading n2 of the dial indicator (13) at this time. 2.5 Calculate the clearance Δn of the measured load mechanism: Δn = |n1 - n2|; Load mechanism force measurement includes compressive load force measurement and tensile load force measurement, specifically: When measuring tensile load: After completing the pre-measurement preparations, rotate the screw with the crank handle (6) to drive the return contact block (7) to move in the stretching direction, and then stretch it by the piston rod of the measured load mechanism. Read the corresponding stretching stroke L1 on the scale (16) as required. Stop rotating the screw with the crank handle (6) and read the load force value F1 on the force value display (18) at this time. This load force value is the load force of the measured load mechanism at stroke L1. When measuring compressive load force: After completing the pre-measurement preparations, rotate the screw with the crank handle (6) to drive the return contact block (7) to move in the compression direction, and then be compressed by the piston rod of the measuring load mechanism. Read the corresponding tensile stroke L2 on the scale (16) as required. Stop rotating the screw with the crank handle (6) and read the load force value F2 on the force value display (18) at this time. This load force value is the load force of the measured load mechanism at stroke L2. Step 3, After measurement, organize the data: 3.1 After the measurement is completed, the contact clamping cover plate (2) and the base (1) are fastened, the clamping cover plate (2) is opened, the measured load mechanism is removed, and the force sensor (10) and the loop connector (8) are removed; 3.2 To measure the next load mechanism, follow steps 1 to 2. Once the operation is complete, remove the measuring device from the vise.

9. In step 1.4 of the method for measuring the piston rod movement clearance and load force of a load mechanism according to claim 8, the compression amount of the push rod of the dial indicator (13) is >5mm.

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