A latching force detection tool and measurement method

Abstract

This application relates to the field of mechanical testing tooling technology, and in particular to a locking force testing tooling and measurement method, comprising a support body with an annular groove coaxially formed thereon; a rear support, with a first ball bearing sleeve disposed between the rear support and the support body, the first ball bearing sleeve being rolledly connected to the inner circumference of the rear support; a second ball bearing sleeve, coaxially sleeved and connected to the outer circumference of the rear support; a front support, connected to the rear support at the end away from the annular groove, and a third ball bearing sleeve coaxially sleeved and connected to the outer circumference of the front support; a tension / compression sensor, located in the inner cavity of the rear support, with one end connected to the support body and the other end connected to a force application unit; and a recording and display unit. This application has the advantages of reducing friction during the locking force measurement process, ensuring the coaxiality of the tooling and the object to be measured, improving the accuracy of the measurement data, reducing the weight of the testing tooling, and facilitating installation, handling, and carrying.

Description

Technical Field

[0001] This application relates to the field of mechanical testing tooling technology, and in particular to a locking force testing tooling and measurement method. Background Technology

[0002] The loading material is generally fixed in position by the locking force applied by the locking assembly, and the initial velocity is controlled during launch. The magnitude of the locking force is not a fixed value, but varies within a certain range. If the locking force is too large, it will increase the initial disturbance of the loading material; if the locking force is too small, the loading material may move, jump, or even fall off due to external factors such as gravity, vibration, and the force of the gas flow generated when the loading material is launched, which cannot guarantee safe use.

[0003] To minimize the impact of inconsistencies between initial disturbances and initial states, and to ensure that the locking forces of each locking component are as consistent as possible, it is necessary to detect and adjust the consistency of the locking forces of the locking components. Existing technology discloses a novel trigger locking force detection device, comprising a force application unit, a force measurement unit, and a recording and display unit. The force measurement unit includes a support body, a transmission rod, a force sensor, a guide rod, and a force measuring slider. The support body is a long cylindrical structure with an outer diameter not exceeding the inner diameter of the launch tube. A force measuring slider is fixed to the tail of the support body. A force sensor is installed inside the support body, and both ends of the force sensor are connected via transmission rods... The moving rod and guide rod are connected and fixed to the support body and the force measuring slider; the force measuring slider is located at the end of the force measuring unit and has an annular groove that mates with the protruding structure on the conductive locking assembly, which is used to engage with the conductive locking assembly in the launch tube to lock and limit the force measuring unit; the force applying unit is connected to the head of the force measuring unit, which drives the force measuring unit to move toward the launch tube opening, pulls and releases the force measuring unit from the conductive locking assembly; the recording and display unit includes a peak hold instrument, which is connected to the mechanical sensor through wires, receives the signal output by the mechanical sensor and converts it into locking force data for display, recording and storage.

[0004] Regarding the aforementioned technologies, the existing locking force detection device requires first placing the structure formed by the support body and the transmission rod into the inner cavity of the launching tube. Then, the force application unit applies force to the transmission rod to pull the support body, causing the force measuring slider to separate from the locking assembly. During measurement, due to the influence of friction and coaxiality between the support body and the inner cavity of the launching tube, it is impossible to accurately measure the corresponding values ​​of tension and compression. Summary of the Invention

[0005] To improve the accuracy of tensile and compressive force measurements of locking components, this application provides a locking force testing fixture and measurement method.

[0006] The locking force testing fixture and measurement method provided in this application adopts the following technical solution: Firstly, this application provides a locking force testing fixture.

[0007] A locking force testing fixture, including A support body, wherein an annular groove is coaxially formed on the support body, and the annular groove is used to cooperate with the locking assembly; A rear support is provided, and a first ball bearing sleeve is provided between the rear support and the support body. The first ball bearing sleeve is in rolling connection with the inner circumferential side of the rear support. The second ball bearing bush is coaxially sleeved and connected to the outer periphery of the rear support. A front support is connected to the rear support at the end away from the annular groove, and a third ball bearing copper sleeve is coaxially sleeved on the outer periphery of the front support. A tension / compression sensor is located in the inner cavity of the rear support, with one end connected to the support body and the other end connected to a force-applying unit, which is used to apply force to the tension / compression sensor. A recording and display unit is electrically connected to the tension / compression sensor and is used to record and display the detection data of the tension / compression sensor.

[0008] By employing the above technical solution, force is applied to the rear support, which drives the front support to move, inserting both the rear and front supports into the inner cavity of the gun barrel. At this time, the steel balls on the second and third ball bearing sleeves roll and connect with the inner wall of the gun barrel. Then, the position of the support body is adjusted so that the annular groove engages with the hook part in the locking assembly. The detection device then applies force to the tension / compression sensor through the force application unit. The tension / compression sensor transmits the force to the support body, causing the annular groove to disengage from the hook part in the locking assembly. At the moment of disengagement, the force measured by the tension / compression sensor reaches a threshold, which is the locking force. The designed locking force detection fixture, through the support body, facilitates the opening of the annular groove to simulate the engagement with the hook part of the locking assembly. The rear support, in conjunction with the first and second ball bearing bushes, enables a rolling connection between the support and the rear support, and between the rear support and the inner wall of the object under test. This reduces friction during the locking force measurement process and improves the accuracy of the measurement data. The front support and the third ball bearing bush further ensure the coaxiality of the fixture and the object under test, building upon the second ball bearing bush, thus improving the accuracy of the measurement data. The tension and compression sensors facilitate the detection of the locking force, the force application unit facilitates the application of simulated tension and compression, and the recording and display unit facilitates the recording and display of the locking force. Furthermore, the hollow design of the front and rear supports significantly reduces the weight of the testing fixture, making it easier to install, transport, and carry.

[0009] In one specific implementation scheme, the force-applying unit includes A steel wire rope, one end of which is connected to the tension / compression sensor; A hydraulic connector, one end of which is connected to the end of the wire rope away from the tension / compression sensor, and the other end is connected to a hydraulic quick-connect valve; A push rod seat, one end of which is connected to the hydraulic quick-connect valve.

[0010] By adopting the above technical solution, the electric cylinder on the detection device applies force to the push rod seat through the adapter rod. The push rod seat applies force to the hydraulic connector through the hydraulic quick-connect valve. The hydraulic connector applies force to the wire rope. After the wire rope is taut, it applies tension to the tension and compression sensor until the annular groove disengages from the hook in the locking assembly. The designed force application unit is easy to connect to the adapter rod through the push rod seat. The hydraulic quick-connect valve and hydraulic connector facilitate the quick fixing and release of the push rod seat and the adapter rod. The wire rope facilitates the application of force to the tension and compression sensor. Since the wire rope is a flexible rope, the tension measured by the tension and compression sensor, regardless of whether it is coaxial, is always in the axial direction. Therefore, the requirement for coaxiality between the wire rope and the tension and compression sensor during detection can be reduced.

[0011] In one specific implementation, a first connecting shaft connects the tension / compression sensor and the force application unit. The first connecting shaft includes a limiting body and two connecting bodies. The diameter of the limiting body is larger than the diameter of the connecting bodies, and the two connecting bodies are coaxially connected to opposite sides of the limiting body and respectively connected to the tension / compression sensor and the force application unit.

[0012] By adopting the above technical solution, the designed first connecting shaft facilitates the installation of two connecting bodies through the limiting body, and facilitates the connection with the tension / compression sensor and the force application unit through the connecting body.

[0013] In one specific implementation scheme, the front support has a first abutting surface formed inwardly, and the distance between the limiting body and the first abutting surface is set to L1; The rear support has a second abutment surface formed on its inner protrusion, and the distance between the limiting body and the second abutment surface is set to L2; The support body has a third abutment surface protruding outwards, and the distance between the rear support and the third abutment surface is set to L3; When the annular groove engages with the hook portion of the locking assembly, L1 < L3 < L2.

[0014] By adopting the above technical solution, and by limiting the distance between the limiting body and the first and second contact surfaces, and the distance between the rear support and the third contact surface, the rear support and the support body can be separated when measuring the tension or pressure of the locking assembly. This avoids the rear support from contacting and colliding with the support body during the detection of the locking force, which would generate a reaction force and affect the magnitude of the locking force measured by the tension and pressure sensors, thereby improving the accuracy of the locking force measurement.

[0015] In one specific implementation scheme, the push rod seat is provided with a conical guide section, and the front support is provided with a conical guide surface that matches the shape of the conical guide section at one end near the push rod seat.

[0016] By adopting the above technical solution, the designed conical inlet section and conical inlet surface can maintain the coaxiality of the push rod seat and the front support when the push rod seat is pushed towards the support body during the measurement under pressure, thereby improving the accuracy of locking force measurement.

[0017] In one specific implementation, a partition plate is connected inside the front support, and a clearance hole is provided on the partition plate. The wire rope passes through the clearance hole and is offset from the partition plate.

[0018] By adopting the above technical solution, the designed partition plate can ensure that the wire rope will not sway much. On the other hand, it can ensure that the front support cavity can accommodate the force application unit when under pressure, and can prevent the push rod seat and hydraulic joint from falling completely into the front support.

[0019] In one specific implementation, a second connecting shaft is provided between the support body and the tension / compression sensor, and the two ends of the second connecting shaft are threadedly connected to the support body and the tension / compression sensor, respectively.

[0020] By adopting the above technical solution, the designed second connecting shaft can easily, conveniently and quickly realize the connection and disassembly between the tension / compression sensor and the support body.

[0021] In one specific implementation, the rear support and the front support are connected by a plurality of fixing bolts, and the axial direction of the fixing bolts is consistent with the axial direction of the support body.

[0022] By adopting the above technical solution, and by connecting with fixing bolts with the fixing bolts axially aligned with the support body axis, a reliable connection between the front and rear supports can be achieved. Furthermore, the alignment of the fixing bolts axially can increase the maximum stress threshold of the front and rear supports, extend the service life of the testing fixture, and prevent the fixing bolts from interfering with the sliding process of the front support.

[0023] In one specific implementation, the end of the support body furthest from the tension / compression sensor is connected to a force-applying handle.

[0024] By adopting the above technical solution, the designed force-applying handle facilitates the application of force to the support, thereby inserting the front support, rear support and other structures into the cavity of the object to be tested.

[0025] Secondly, this application provides a method for measuring locking force, including... S1: Loading of testing fixture: Apply force to the rear support so that the steel columns of the second and third ball bearing bushes roll and connect with the inner wall of the object to be tested until the annular groove engages with the hook of the locking assembly. S2: Acquisition of tooling position information: The image label on the front end face of the front support is scanned by a vision alignment camera to obtain the tooling position information, and the tooling position information is fed back to the host computer. The host computer adjusts the position of the adapter rod on the locking force detection device until the adapter rod is coaxial with the force application unit connection part. S3: Locking Force Measurement: The locking force detection device applies force to the force application unit through the adapter rod, and the force application unit applies force to the tension and compression sensor until the annular groove disengages from the hook part of the locking assembly. The recording and display unit records and displays the detection data of the tension and compression sensor and obtains the data threshold, i.e., the locking force.

[0026] By adopting the above technical solution, the current three-dimensional spatial coordinates of the detection fixture can be obtained by scanning the image label on the front end face of the front support with a vision-aligning camera. This facilitates the position change of the adapter rod through the moving unit on the detection device, ensuring the coaxiality of the adapter rod and the push rod seat, thereby improving the measurement accuracy of the locking force.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. The designed locking force testing fixture features an annular groove in the support body to simulate the snap-fit ​​of the hook portion of the locking assembly. The rear support, in conjunction with the first and second ball bearing sleeves, enables rolling connection between the support body and the rear support, and between the rear support and the inner wall of the test object. This reduces friction during locking force measurement and improves the accuracy of the measurement data. The front support and the third ball bearing sleeve further ensure the coaxiality of the fixture and the test object, further enhancing the accuracy of the measurement data. Tension and compression sensors facilitate locking force detection, a force application unit facilitates the application of simulated tension and compression, and a recording and display unit facilitates recording and displaying the locking force. Furthermore, the hollow design of the front and rear supports significantly reduces the weight of the testing fixture, facilitating installation, handling, and portability.

[0028] 2. The designed locking force detection fixture facilitates connection with the adapter rod via a push rod seat. The hydraulic quick-connect valve and hydraulic connector facilitate rapid fixing and release of the push rod seat and adapter rod. The steel wire rope facilitates the application of force to the tension / compression sensor. Because the steel wire rope is flexible, the tension force measured by the tension / compression sensor, regardless of whether they are coaxial, is always axial. Therefore, the requirement for coaxiality between the steel wire rope and the tension / compression sensor during detection is reduced.

[0029] 3. The designed locking force testing fixture, by limiting the distance between the limiting body and the first and second contact surfaces, and the distance between the rear support and the third contact surface, can separate the rear support from the support body when measuring the tension or compression of the locking assembly. This avoids the rear support from contacting and colliding with the support body during the locking force testing process, which would generate a reaction force and affect the magnitude of the locking force measured by the tension and compression sensors, thereby improving the accuracy of the locking force measurement. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the connection structure between the support body and the rear support in an embodiment of this application.

[0031] Figure 2 yes Figure 1 A schematic diagram of the structure after adding the front support and the third ball bearing bush.

[0032] Figure 3 yes Figure 2 A schematic diagram of the structure after adding the force application unit and tension / compression sensors.

[0033] Figure 4 yes Figure 3 The first part of the structural diagram.

[0034] Figure 5 yes Figure 3 The second part of the structural diagram.

[0035] Figure 6 yes Figure 4 Enlarged view of section A.

[0036] Figure 7 yes Figure 4 A schematic diagram of the structure behind the hidden record display unit.

[0037] Figure 8 yes Figure 5 A partial structural diagram.

[0038] Figure 9 This is a schematic cross-sectional view of the locking force detection fixture according to an embodiment of this application.

[0039] Figure 10 This is an exploded view of the locking force detection fixture according to an embodiment of this application.

[0040] Explanation of reference numerals in the attached drawings: 1. Support body; 1A. Annular groove; 1B. Third abutment surface; 2. Rear support; 2A. Second abutment surface; 3. First ball bearing sleeve; 3A. First elastic retaining ring; 4. Second ball bearing sleeve; 4A. Second elastic retaining ring; 5. Front support; 5A. First abutment surface; 5B. Conical guide surface; 6. Third ball bearing sleeve; 6A. Third elastic retaining ring; 7. Tension / compression sensor; 8. Force application unit; 8A. Steel wire rope; 8B. Hydraulic connector; 8C. Hydraulic quick-connect valve; 8D. Push rod seat; 8D1. Conical guide section; 9. Recording and display unit; 10. First connecting shaft; 10A. Limiting body; 10B. Connecting body; 11. Divider plate; 12. Second connecting shaft; 13. Force application handle. Detailed Implementation

[0041] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0042] This application discloses a locking force testing fixture and measurement method.

[0043] In a first aspect, embodiments of this application disclose a locking force testing fixture.

[0044] Example 1 Reference Figure 1 A locking force testing fixture includes a support body 1 and a rear support 2. The support body 1 includes a fixed section and a connecting section that are coaxially arranged and integrally formed. The outer diameter of the fixed section is larger than the outer diameter of the connecting section. An annular groove 1A is coaxially formed on the fixed section. The annular groove 1A is used to engage with the hook part in the locking assembly. In order to change the sliding friction between the connecting section and the rear support 2 into rolling friction, a first ball bearing copper sleeve 3 is coaxially connected to the connecting section. One end of the first ball bearing copper sleeve 3 abuts against the side wall of the fixed section, and the other end is limited by a first elastic retaining ring 3A. The first elastic retaining ring 3A is embedded in and engaged with the connecting section.

[0045] Reference Figure 1 The rear support 2 is hollow, and the inner wall of the rear support 2 is connected to multiple steel balls in the first ball bearing sleeve 3, thereby achieving rolling friction between the connecting section and the rear support 2. In use, the rear support 2 needs to be inserted into the inner wall of the object to be tested. In order to reduce the friction between the outer periphery of the rear support 2 and the inner wall of the object to be tested, a second ball bearing sleeve 4 is connected to the first sinking area of ​​the rear support 2. One end of the second ball bearing sleeve 4 abuts against the side wall of the first sinking area of ​​the rear support 2, and the other end is limited by the second elastic retaining ring 4A. The second elastic retaining ring 4A is embedded and fixed to the first sinking area of ​​the rear support 2. The steel balls in the second ball bearing sleeve 4 are used to roll and connect with the inner wall of the object to be tested.

[0046] Reference Figure 2To further maintain coaxiality, a front support 5 is also included. The front support 5 is hollow and is connected and fixed to the end of the rear support 2 away from the fixed section. In this embodiment, the front support 5 and the rear support 2 can be fixedly connected or detachably connected, as long as the relative position of the front support 5 and the rear support 2 can be fixed. In order to reduce the friction between the front support 5 and the inner wall of the test object, a third ball bearing copper sleeve 6 is coaxially sleeved on the outer periphery of the sinking area of ​​the front support 5. One end of the third ball bearing copper sleeve 6 abuts against the side wall of the sinking area of ​​the front support 5, and the other end is limited by a third elastic retaining ring 6A. The third elastic retaining ring 6A is embedded and locked in the sinking area of ​​the front support 5.

[0047] Reference Figure 2 To facilitate the installation of the first connecting shaft 10, the rear support 2 and the front support 5 are fixed by multiple fixing bolts. The multiple fixing bolts are evenly distributed along the circumference of the limiting body 10A, and the axial direction of the fixing bolts is consistent with the axial direction of the support body 1. In order to further reduce the influence of the fixing bolts on the locking force detection, the fixing bolts are set as countersunk bolts. A settlement area is provided on the rear support 2, and the countersunk bolts are installed through the settlement area.

[0048] Reference Figure 3 In order to apply force to the support body 1 so that the limiting groove disengages from the hook part of the locking component and thus obtains the locking force, a tension / compression sensor 7 and a force application unit 8 are also included. One end of the tension / compression sensor 7 is connected to the connecting section. One end of the force application unit 8 extends out of the inner cavity of the front support 5 and is connected to the adapter rod on the detection device. The other end extends into the inner cavity of the rear support 2 and is connected to the end of the tension / compression sensor 7 away from the connecting section. The adapter rod applies force to the tension / compression sensor 7 through the force application unit 8, so that the connecting section moves relative to the rear support 2 through the first ball bearing sleeve 3 until the limiting groove disengages from the hook part of the locking component. The tension / compression sensor 7 records the tension and compression thresholds at the moment of disengagement, i.e., the locking force.

[0049] Reference Figure 3 In order to facilitate the connection between the connecting section and the tension / compression sensor 7, a second connecting shaft 12 is also included, and the two ends of the second connecting shaft 12 are threadedly connected to the connecting section and the tension / compression sensor 7, respectively.

[0050] Reference Figure 4 In order to facilitate the recording and reading of the locking force value, a recording and display unit 9 is also included. The recording and display unit 9 is electrically connected to the tension and compression sensor 7 and is used to read, record and display the locking force detection data of the tension and compression sensor 7.

[0051] Reference Figure 4In order to facilitate the provision of power for the operation of the tension and compression sensor 7 and to transmit the locking force data measured by the tension and compression sensor 7, a through hole is provided on the support body 1. The tension and compression sensor 7 and the recording and display unit 9 are electrically connected through a wire. One end of the wire is electrically connected to the tension and compression sensor 7, and the other end passes through the through hole and is electrically connected to the recording and display unit 9.

[0052] Example 2 Reference Figure 5 Based on Example 1, in order to reduce the impact of the coaxiality of the adapter rod and the support body 1 on the accuracy of the locking force detection during the detection process, the force application unit 8 includes a wire rope 8A, a hydraulic connector 8B, and a push rod seat 8D. One end of the wire rope 8A is connected to a first lock, and the end of the first lock away from the wire rope 8A is connected and fixed to the tension and compression sensor 7. The end of the wire rope 8A away from the first lock is connected to a second lock. One end of the hydraulic connector 8B is connected to the second lock, and the other end is flanged and connected to a hydraulic quick-connect valve 8C. One end of the push rod seat 8D is fixedly connected to the end of the hydraulic quick-connect valve 8C away from the second lock, and the other end is used to connect to the adapter rod. The quick locking and releasing of the push rod seat 8D and the adapter rod are achieved through the cooperation of the hydraulic connector 8B and the hydraulic quick-connect valve 8C. In order to extend the service life of the wire rope 8A, the surface of the wire rope 8A is coated with plastic.

[0053] Reference Figure 5 In order to limit the sway amplitude of the wire rope 8A and prevent the structure of the wire rope 8A away from the tension and compression sensor 7 from falling into the front support 5, a partition plate 11 is also included. The partition plate 11 is located in the inner cavity of the front support 5 and divides the inner cavity of the front support 5 into two chambers. The partition plate 11 is provided with a clearance hole through which the wire rope 8A passes, and the diameter of the clearance hole is larger than the outer diameter of the wire rope 8A.

[0054] Reference Figure 6 To facilitate the connection between the tension / compression sensor 7 and the second latch, a first connecting shaft 10 is also included. The first connecting shaft 10 includes a limiting body 10A and two connecting bodies 10B. The limiting body 10A and the connecting bodies 10B are coaxial and integrally formed. The diameter of the limiting body 10A is larger than the diameter of the connecting body 10B. The two connecting bodies 10B are located on opposite sides of the limiting body 10A, and the two connecting bodies 10B are threadedly connected to the second latch and the tension / compression sensor 7, respectively.

[0055] Example 3 Reference Figure 7Based on Embodiment 2, in order to avoid collision between the rear support 2 and the side wall of the fixed section during the locking force detection process, which would affect the accuracy of the locking force measurement, a first abutment surface 5A is formed by an inward protrusion on the front support 5. The distance between the first abutment surface 5A and the side of the limiting body 10A away from the support body 1 is set to L1. A second abutment surface 2A is formed by an inward protrusion on the rear support 2. The distance between the second abutment surface 2A and the side of the limiting body 10A away from the first abutment surface 5A is set to L2. The distance between the rear support 2 and the side wall of the fixed section is also set to L2. The distance is set to L3. When the annular groove 1A engages with the hook of the locking assembly, L1 < L2 < L3. In the pressing state, the limiting body 10A moves toward the first abutment surface 5A until L1 is 0. At this time, the distance L3 between the rear support 2 and the fixed section is greater than 0. In the pulling state, the limiting body 10A moves toward the second abutment surface 2A until L2 is 0. At this time, the distance L3 between the rear support 2 and the fixed section is also greater than 0. That is, the rear support 2 does not contact the fixed section throughout the entire locking force measurement process.

[0056] Example 4 Reference Figure 8 Based on embodiment 3, in order to ensure the coaxiality of the push rod seat 8D and the front support 5 in the compressed state, a conical guide section 8D1 is provided on the push rod seat 8D, and a conical guide surface 5B adapted to the shape of the conical guide section 8D1 is provided on one end of the front support 5 near the push rod seat 8D. In the compressed state, the adapter rod applies force to the push rod seat 8D, so that the conical guide section 8D1 of the push rod seat 8D is inserted into the conical guide surface 5B of the front support 5. After the conical surface of the conical guide section 8D1 is in contact with the conical guide surface 5B, it drives the front support 5 to move, so that the first abutment surface 5A abuts against the limiting body 10A. The force continues to be applied, and the limiting body 10A applies force to the tension and pressure sensor 7 through the connecting body 10B. The tension and pressure sensor 7 applies force to the support body 1 until the annular groove 1A disengages from the hook part in the locking assembly, and the locking force is measured.

[0057] Example 5 Reference Figure 9 and Figure 10 In order to facilitate inserting the front support 5, the rear support 2, and the support body 1 into the cavity of the object to be tested, a force application handle 13 is also included. The force application handle 13 is connected to the end of the fixed section away from the connecting section. In this application, the force application handle 13 can be integrally connected to the fixed section, welded to the fixed section, or threadedly connected to the fixed section. As long as the fixed section and the force application handle 13 can be fixed, it is acceptable. In this embodiment, the fixed section and the force application handle 13 are preferably threadedly connected to facilitate assembly and disassembly.

[0058] The implementation principle of a locking force detection fixture in this application embodiment is as follows: In the pulling state, the force application handle 13 applies force, and the force application handle 13 drives the front support 5 to move through the rear support 2, inserting the rear support 2 and the front support 5 into the inner cavity of the barrel. At this time, the steel balls on the second ball bearing sleeve 4 and the third ball bearing sleeve 6 roll and connect with the inner cavity wall of the barrel. Then, the position of the support body 1 is adjusted so that the annular groove 1A engages with the hook part in the locking assembly. At this time, L1 < L2 < L3. Then, the detection device applies force to the push rod seat 8D through the adapter rod. The push rod seat 8D applies force to the first connecting shaft 10 through the wire rope 8A. The first connecting shaft 10 applies force to the tension and pressure sensor 7. The tension and pressure sensor 7 transmits the force to the support body 1, so that the annular groove 1A disengages from the hook part in the locking assembly. At the moment of disengagement, the tension measured by the tension and pressure sensor 7 will reach a threshold, which is the locking force.

[0059] In the pressurized state, the detection device applies force to the push rod seat 8D through the adapter rod, so that the conical guide section 8D1 on the push rod seat 8D fits against the conical guide surface 5B on the front support 5 until the first contact surface 5A contacts the limiting body 10A. Then, the force is continued to be applied, and the front support 5 applies force to the tension and pressure sensor 7 through the first connecting shaft 10. The tension and pressure sensor 7 applies force to the support body 1 through the second connecting shaft 12 until the limiting groove disengages from the hook part in the locking assembly. At the moment of disengagement, the pressure measured by the tension and pressure sensor 7 will reach a threshold, which is the locking force.

[0060] Secondly, embodiments of this application disclose a locking force detection method, including... S1: Loading of testing fixture: Apply force to the rear support 2 so that the steel columns of the second ball bearing sleeve 4 and the third ball bearing sleeve 6 roll and connect with the inner wall of the object to be tested until the annular groove 1A engages with the hook part of the locking assembly. S2: Acquisition of tooling position information: The image label on the front end face of the front support 5 is scanned by a vision alignment camera to obtain the tooling position information, and the tooling position information is fed back to the host computer. The host computer adjusts the position of the adapter rod on the locking force detection device until the adapter rod is coaxial with the connection part of the force application unit 8. S3: Locking force measurement: The locking force detection device applies force to the force application unit 8 through the adapter rod, and the force application unit 8 applies force to the tension and compression sensor 7 until the annular groove 1A disengages from the hook part of the locking assembly. The recording and display unit 9 records and displays the detection data of the tension and compression sensor 7 and obtains the data threshold, i.e., the locking force.

[0061] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A locking force testing fixture, characterized in that: include A support body (1) is provided with an annular groove (1A) coaxially on the support body (1), and the annular groove (1A) is used to cooperate with the locking assembly; Rear support (2), a first ball bearing sleeve (3) is provided between the rear support (2) and the support body (1), and the first ball bearing sleeve (3) is in rolling connection with the inner circumferential side of the rear support (2); The second ball bearing sleeve (4) is coaxially sleeved and connected to the outer periphery of the rear support (2); The front support (5) is connected to the rear support (2) at the end away from the annular groove (1A), and a third ball bearing copper sleeve (6) is coaxially sleeved on the outer periphery of the front support (5). A tension / compression sensor (7) is located in the inner cavity of the rear support (2), with one end connected to the support body (1) and the other end connected to a force application unit (8), which is used to apply force to the tension / compression sensor (7). A recording and display unit (9) is electrically connected to the tension / compression sensor (7) and is used to record and display the detection data of the tension / compression sensor (7). The force-applying unit (8) includes A steel wire rope (8A), one end of which is connected to the tension / compression sensor (7); A hydraulic connector (8B) is provided, with one end of the hydraulic connector (8B) connected to the end of the wire rope (8A) away from the tension / compression sensor (7), and the other end connected to a hydraulic quick-connect valve (8C). A push rod seat (8D), one end of which is connected to the hydraulic quick-connect valve (8C).

2. The locking force testing fixture according to claim 1, characterized in that: A first connecting shaft (10) connects the tension / compression sensor (7) and the force application unit (8). The first connecting shaft (10) includes a limiting body (10A) and two connecting bodies (10B). The diameter of the limiting body (10A) is larger than the diameter of the connecting bodies (10B). The two connecting bodies (10B) are coaxially connected to opposite sides of the limiting body (10A) and are respectively connected to the tension / compression sensor (7) and the force application unit (8).

3. The locking force testing fixture according to claim 2, characterized in that: The front support (5) has a first abutting surface (5A) formed on its inner protrusion, and the distance between the limiting body (10A) and the first abutting surface (5A) is set to L1; The rear support (2) has a second abutment surface (2A) formed on its inner protrusion, and the distance between the limiting body (10A) and the second abutment surface (2A) is set to L2; The support (1) has a third abutment surface (1B) protruding outward, and the distance between the rear support (2) and the third abutment surface (1B) is set to L3; When the annular groove (1A) engages with the hook portion of the locking assembly, L1 < L3 < L2.

4. The locking force testing fixture according to claim 3, characterized in that: The push rod seat (8D) is provided with a conical guide section (8D1), and the front support (5) is provided with a conical guide surface (5B) that matches the shape of the conical guide section (8D1) at one end near the push rod seat (8D).

5. The locking force testing fixture according to claim 1, characterized in that: The front support (5) is connected to a partition plate (11), and the partition plate (11) has a clearance hole. The wire rope (8A) passes through the clearance hole and is offset from the partition plate (11).

6. The locking force testing fixture according to claim 1, characterized in that: A second connecting shaft (12) is provided between the support body (1) and the tension / compression sensor (7), and the two ends of the second connecting shaft (12) are threadedly connected to the support body (1) and the tension / compression sensor (7) respectively.

7. The locking force testing fixture according to claim 1, characterized in that: The rear support (2) and the front support (5) are connected by multiple fixing bolts, and the axial direction of the fixing bolts is consistent with the axial direction of the support body (1).

8. The locking force testing fixture according to claim 1, characterized in that: The support (1) is connected to a force-applying handle (13) at the end away from the tension / compression sensor (7).

9. A method for measuring locking force, characterized in that: The locking force testing fixture as described in any one of claims 1-8 includes: S1: Loading of testing fixture: Apply force to the rear support (2) so that the steel columns of the second ball bearing sleeve (4) and the third ball bearing sleeve (6) roll and connect with the inner wall of the object to be tested until the annular groove (1A) engages with the hook part of the locking assembly. S2: Acquisition of tooling position information: The image label on the front end face of the front support (5) is scanned by a vision alignment camera to obtain the tooling position information and the tooling position information is fed back to the host computer. The host computer adjusts the position of the adapter rod on the locking force detection device until the adapter rod is coaxial with the connection part of the force application unit (8). S3: Locking force measurement: The locking force detection device applies force to the force application unit (8) through the adapter rod, and the force application unit (8) applies force to the tension and compression sensor (7) until the annular groove (1A) disengages from the hook part of the locking assembly. The recording and display unit (9) records and displays the detection data of the tension and compression sensor (7) and obtains the data threshold, i.e., the locking force.

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