A torque testing device for press-fit nuts

Abstract

The present invention belongs to the technical field of torque testing, and particularly relates to a torque testing device for press-fit nuts, which comprises components such as a support plate, a vertical plate, a first guide rail, a lifting table, a fixing plate, an electric wrench, a connecting head, a torque measuring instrument, and a nut mounting seat. Among them, the support plate is connected to the vertical plate through a horizontal center line. A first guide rail with a high-precision ball guide rail is fixedly connected to the side of the vertical plate. The lifting table is slidably connected to the first guide rail. The lifting table includes a wear-resistant fixing plate. A high-torque electric wrench is installed on the fixing plate. The output end of the electric wrench is connected to a modular plug connector. The connecting head is matched with a sleeve to adapt to different nuts. The torque measuring instrument is connected to a high-precision sensor through a nut mounting seat. The nut mounting seat is composed of a disc-shaped base and spliceable nut positioning blocks. A pressing ring and a support column are arranged in the base to ensure the stable fixation of the nut. The overall structure adopts high-strength materials and modular design to ensure the stability, durability, and easy maintainability of the device.

Description

Technical Field

[0001] The present invention belongs to the technical field of torque testing, and particularly relates to a torque testing device for press-fit nuts. Background Art

[0002] In modern manufacturing, press-fit nuts are widely used in the connection parts of various mechanical structures. By applying a certain torque, the press-fit nuts are firmly fixed in the predetermined position to ensure the stability and load-bearing capacity of the mechanical structure. In order to ensure the installation quality of the press-fit nuts, it is necessary to accurately test the torque applied to them. At present, the common torque testing devices for press-fit nuts on the market mostly adopt manual operation methods, where manual torque is applied and the corresponding torque value is read. This method has problems such as cumbersome operation, low measurement accuracy, and low efficiency.

[0003] Specifically, the existing manual torque testing devices usually require operators to manually adjust and read the torque value, which is easily affected by human factors, resulting in inconsistent measurement results. In addition, the manual operation method is difficult to achieve rapid testing of a large number of nuts, limiting the improvement of production efficiency. On the other hand, although some automated torque testing devices have improved the testing efficiency to a certain extent, their structures are complex, maintenance costs are high, and it is often difficult to balance testing accuracy and operation convenience in actual applications.

[0004] In addition, the existing torque testing devices lack effective control over the nut positioning and torque application processes in their designs, easily causing the nuts to shift or rotate during the testing process, affecting the accuracy of the testing results. These problems are particularly prominent in application scenarios with high-precision requirements, and there is an urgent need for a torque testing device for press-fit nuts that can improve testing accuracy, is easy to operate, and is suitable for testing a large number of nuts. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a torque testing device for press-fit nuts, which can realize a torque testing device for press-fit nuts with reasonable structure, simple operation, high measurement accuracy and suitable for large-scale production.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A torque testing device for press-fit nuts, including a support plate. At the horizontal midline of the upper end surface of the support plate, a vertical plate is connected. On the side surface of the vertical plate, a first guide rail is fixedly connected, and a lifting table is slidably connected to the first guide rail;

[0008] The lifting table includes a fixing plate. An electric wrench is installed on the fixing plate. The output end of the electric wrench is connected to a connecting head, and the connecting head is used to install a sleeve for locking the nut;

[0009] On one side of the bottom of the support plate, a torque measuring instrument is provided. The input end of the torque measuring instrument is connected to a nut mounting seat, and the nut mounting seat is used to mount the nut to be measured.

[0010] The nut mounting seat includes a base. The base is arranged in a disc shape with an open top, and a nut positioning block is arranged inside the base. The nut positioning blocks are evenly distributed around the central axis of the base, and a plurality of the nut positioning blocks are spliced into an annular shape. A pressing ring is clamped on the inner top of the base.

[0011] When measuring the torque of the nut, the nut is mounted on the ring spliced by a plurality of the nut positioning blocks.

[0012] Further, on one side of the bottom of the vertical plate, a mounting bracket is connected.

[0013] On one side of the torque measuring instrument, there is a clamping plate that is clamped on the mounting bracket. On one side of the clamping plate, locking knobs are symmetrically arranged, and the locking knobs are used to connect the clamping plate to the mounting bracket.

[0014] At the input end of the torque measuring instrument, a positioning seat is provided. At the center of the top of the positioning seat, a positioning groove is opened, and on the upper end surface of the positioning seat, stoppers are evenly arranged around its central axis.

[0015] The bottom of the base is fixedly connected with a plug-in seat. The plug-in seat is inserted into the positioning groove, and the stoppers are clamped at the four corners of the plug-in seat.

[0016] Further, on the inner bottom of the base, support columns are evenly distributed around the central axis of the base.

[0017] When installing the nut positioning block inside the base, the support columns abut against the lower end surface of the nut positioning block.

[0018] On the outside of the base, clamping grooves are penetrated and arranged evenly around the central axis of the base.

[0019] The shape of the nut positioning block is set to be fan-shaped. A first stopper is fixedly connected to the outside of the nut positioning block. When the nut positioning block is installed inside the base, the first stopper is snapped into the clamping groove.

[0020] One end of the nut positioning block is provided with a splicing groove, and the other end of the nut positioning block is fixedly connected with a splicing column that matches the splicing groove.

[0021] An arc groove is opened on the inner side of the nut positioning block, and a plurality of the arc grooves can be spliced into a circle.

[0022] Further, a socket is provided at the output end of the electric wrench.

[0023] At the top of the connecting head, a plug-in head that matches the socket is fixedly connected.

[0024] A sleeve joint is fixedly connected to the bottom center of the connector head, and the sleeve joint is used to connect the sleeve of the locking nut.

[0025] Furthermore, scale lines are evenly arranged around the upper end surface of the pressing ring along its central axis;

[0026] A pointer is provided on the lower end surface of the connector head;

[0027] A second stop block is fixedly connected to the outer periphery of the pressing ring, and the second stop block is engaged with the clamping groove.

[0028] Furthermore, a sliding table is slidably connected to the first guide rail, and the fixing plate is connected to the sliding table;

[0029] A damping rod connected to the vertical plate is provided on one side of the first guide rail;

[0030] A positioning handle is rotatably connected to the side plate, and a locking head is provided at one end of the positioning handle;

[0031] When the positioning handle is rotated, the locking head abuts against the damping rod.

[0032] Furthermore, a through hole is formed through the fixing plate, and the output end of the electric wrench passes through the through hole;

[0033] A cable sleeve is provided on the top of the fixing plate, and a fixing angle member is provided at one end of the cable sleeve, and the fixing angle member is connected to the top of the vertical plate.

[0034] Furthermore, a second guide rail is fixedly connected to the back of the vertical plate, and a counterweight block is slidably connected to the second guide rail;

[0035] A first hanging ring is provided on the top of the counterweight block, a second hanging ring is provided on the side surface of the side plate, and a deflecting wheel is provided on the top of the vertical plate;

[0036] A steel wire rope is connected between the first hanging ring and the second hanging ring, and the steel wire rope passes through the deflecting wheel.

[0037] Furthermore, reinforcing plates are symmetrically and fixedly connected between the support plate and the vertical plate.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0039] First of all, aiming at the problems of cumbersome operation and low measurement accuracy of the existing manual torque testing device, this device adopts the first guide rail designed with a high-precision ball guide rail and a high-precision sliding table to realize the smooth sliding of the lifting table; the electric wrench has a high torque output capacity, and is combined with a torque measuring instrument with a high-precision sensor to ensure the high accuracy of torque application and measurement, thereby improving the consistency and reliability of the test results.

[0040] Secondly, to address the problems of low efficiency in existing devices and difficulty in achieving rapid testing of a large number of nuts, this device is designed with a circular ring structure formed by splicing multiple nut positioning blocks. The base can quickly fix the nuts, facilitating batch testing of the nuts; the modular nut mounting base and the socket with a quick locking design make it more convenient to replace and install nuts, significantly improving the testing efficiency and meeting the requirements of large-scale production.

[0041] Thirdly, to address the problems of complex structure and high maintenance cost in existing automated torque testing devices, this device uses various components made of modular and high-strength materials, such as the support plate made of high-strength steel, the fixing plate made of wear-resistant material, and the sleeve made of high-strength alloy material, simplifying the overall structure and reducing the maintenance difficulty and cost; at the same time, the design of connecting the counterweight block with the steel rope optimizes the balance of the device, reduces vibration and impact during operation, and extends the service life of the device.

[0042] Finally, to address the problem of insufficient control in the nut positioning and torque application processes of existing devices, this device ensures the fixation and stability of the nuts during testing through precisely designed positioning seats, sockets, and support columns; the combined use of the locking handle and the damping rod further improves the operational smoothness and safety of the device at different testing stages; the cooperation of the scale lines on the lower pressing ring and the pointer enables the operator to directly read and record the torque value, improving the operational convenience and measurement accuracy. Brief Description of the Drawings

[0043] Figure 1 is a schematic structural diagram of the present invention;

[0044] Figure 2 is a schematic structural diagram of the vertical plate of the present invention Figure 1 ;

[0045] Figure 3 is a schematic structural diagram of the vertical plate of the present invention Figure 2 ;

[0046] Figure 4 is a schematic structural diagram of the lifting platform of the present invention;

[0047] Figure 5 is a schematic structural diagram of the electric wrench of the present invention;

[0048] Figure 6 is a schematic structural diagram of the torque measuring instrument of the present invention;

[0049] Figure 7 is a schematic structural diagram of the nut mounting base of the present invention;

[0050] Figure 8 is a schematic structural diagram of the base of the present invention;

[0051] Figure 9Schematic diagram of the nut positioning block of the present invention;

[0052] Figure 10 Schematic diagram of the lower pressing ring of the present invention.

[0053] In the attached drawings, the components represented by each reference numeral are listed as follows:

[0054] 1. Support plate; 11. Reinforcing plate;

[0055] 2. Vertical plate; 21. First guide rail; 211. Slide table; 22. Damping rod; 23. Deflection wheel; 24. Mounting bracket; 25. Second guide rail; 26. Counterweight; 261. First hanging ring;

[0056] 3. Lifting table; 31. Fixed plate; 311. Through hole; 32. Side plate; 321. Second hanging ring; 33. Positioning handle; 331. Locking head; 34. Cable sleeve; 35. Fixed angle piece;

[0057] 4. Electric wrench; 41. Socket;

[0058] 5. Connector; 51. Plug connector; 52. Pointer; 53. Socket joint;

[0059] 6. Torque measuring instrument; 61. Clamping plate; 611. Locking knob; 62. Positioning seat; 621. Positioning groove; 622. Stopper;

[0060] 7. Nut mounting seat; 71. Base; 711. Clamping groove; 712. Support column; 72. Plug-in seat; 73. Nut positioning block; 731. Splicing groove; 732. Splicing column; 733. Arc groove; 734. First stopper; 74. Lower pressing ring; 741. Scale line; 742. Second stopper. Detailed implementation manners

[0061] In order to make the purpose and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementation manners of the present invention, and does not strictly limit the scope of protection specifically claimed by the present invention.

[0062] Embodiment 1:

[0063] Refer to Figures 1 - 10, A rivet nut torque testing device, including a support plate 1 made of high-strength steel to ensure the stability and durability of the overall structure; at the horizontal midline of the upper end surface of the support plate 1, a vertical plate 2 is connected. The vertical plate 2 is made of aluminum alloy material, which has the characteristics of light weight and high strength, facilitating the installation and maintenance of subsequent components; on the side of the vertical plate 2, a first guide rail 21 is fixedly connected. The first guide rail 21 adopts a high-precision ball guide rail design to ensure smooth sliding of the lifting platform 3 without obstruction; the lifting platform 3 is slidably connected to the first guide rail 21, and the lifting platform 3 is equipped with an anti-slip pad to prevent displacement during operation and ensure the accuracy and safety of the testing process.

[0064] Refer to Figures 1 - 10 , The lifting platform 3 includes a fixing plate 31 made of wear-resistant material to extend its service life; an electric wrench 4 is installed on the fixing plate 31. The electric wrench 4 has a high torque output capacity and can adapt to the testing requirements of nuts of different specifications; the output end of the electric wrench 4 is connected to a connecting head 5. The connecting head 5 adopts a replaceable design and is adapted to the sleeves 41 of various models of locking nuts to ensure the versatility and flexibility of the device.

[0065] Refer to Figures 1 - 10 , On one side of the bottom of the support plate 1, a torque measuring instrument 6 is provided. The torque measuring instrument 6 adopts a high-precision sensor and can monitor the applied torque value in real time to ensure the accuracy of the measurement result; the input end of the torque measuring instrument 6 is connected to a nut mounting seat 7. The nut mounting seat 7 is designed as a modular structure, facilitating quick replacement and maintenance; the nut mounting seat 7 is used to install the nut to be measured to ensure the fixed position of the nut during the testing process and avoid deviation affecting the test result.

[0066] Refer to Figures 7 - 10 , The nut mounting seat 7 includes a base 71. The base 71 is set as a disk shape with an open top and is made of corrosion-resistant material to adapt to different working environments; inside the base 71, there is a nut positioning block 73. The nut positioning blocks 73 are evenly distributed around the central axis of the base 71 to ensure the uniform distribution of nuts on the ring; multiple nut positioning blocks 73 are spliced into a circular ring, and the base can quickly fix the nuts, facilitating batch testing of the nuts; at the inner top of the base 71, a pressing ring 74 is clamped. The pressing ring 74 is made of high-strength alloy material and can withstand the high pressure generated during the testing process to ensure the stability of the nut during the test; when measuring the torque of the nut, the nut is installed on the ring spliced by multiple nut positioning blocks 73 to ensure that each nut can be tested under the same conditions, improving the consistency and reliability of the test results.

[0067] Refer to Figures 7 - 10, one side of the bottom of the vertical plate 2 is connected with a mounting bracket 24. The mounting bracket 24 is designed to be adjustable to adapt to torque measuring instruments 6 of different sizes. On one side of the torque measuring instrument 6, there is a positioning plate 61 that is snapped onto the mounting bracket 24. The positioning plate 61 is firmly connected to the mounting bracket 24 through a quick-locking mechanism, facilitating quick installation and disassembly. On one side of the positioning plate 61, locking knobs 611 are symmetrically arranged. The locking knobs 611 are used to connect the positioning plate 61 to the mounting bracket 24, ensuring the stability and safety of the torque measuring instrument 6 during the test process.

[0068] Refer to Figures 7 - 10 , at the input end of the torque measuring instrument 6, there is a positioning seat 62. The positioning seat 62 adopts a high-precision machining process to ensure precise fit with the socket 72 of the base 71. At the center of the top of the positioning seat 62, there is a positioning groove 621. The positioning groove 621 is used to accommodate the socket 72, ensuring accurate positioning of the base 71 during the installation process. On the upper end face of the positioning seat 62, stoppers 622 are arranged at equal intervals around its central axis. The stoppers 622 prevent the socket 72 from tilting or shifting during the installation process, ensuring the accuracy of torque measurement. At the bottom of the base 71, a socket 72 is fixedly connected. The socket 72 adopts a quick-locking design and can be quickly inserted into the positioning groove 621. Moreover, the stoppers 622 are snapped at the four corners of the socket 72, further enhancing the connection stability and ensuring a firm connection between the base 71 and the positioning seat 62 when applying torque.

[0069] Refer to Figures 7 - 10 , at the inner bottom of the base 71, support columns 712 are distributed at equal intervals around the central axis of the base 71. The support columns 712 are made of high-strength steel to provide the necessary supporting force and prevent the nut positioning block 73 from sinking or shifting during the test process. When installing the nut positioning block 73 into the interior of the base 71, the support columns 712 abut against the lower end face of the nut positioning block 73, ensuring the fixation and stability of the nut positioning block 73. On the outer side of the base 71, positioning slots 711 are penetrated. The positioning slots 711 are distributed at equal intervals around the central axis of the base 71, facilitating the fixation and splicing of the nut positioning block 73. The shape of the nut positioning block 73 is set as a sector to adapt to the design of the disc-shaped base 71. On the outer side of the nut positioning block 73, a first stopper 734 is fixedly connected. When the nut positioning block 73 is installed into the interior of the base 71, the first stopper 734 is snapped into the positioning slot 711, ensuring the firm fixation of the nut positioning block 73. At one end of the nut positioning block 73, a splicing groove 731 is opened. The splicing groove 731 cooperates with the splicing column 732 fixedly connected to the other end, ensuring that multiple nut positioning blocks 73 can be firmly spliced into a circular ring. On the inner side of the nut positioning block 73, arc-shaped grooves 733 are opened. Multiple arc-shaped grooves 733 can be spliced into a circle, further enhancing the stability and integrity of the nut positioning block 73.

[0070] Refer to Figure 5, a socket 41 is provided at the output end of the electric wrench 4. The socket 41 is made of high-strength alloy material and can withstand high torque output. A plug joint 51 that matches the socket 41 is fixedly connected to the top of the connecting head 5. The plug joint 51 is designed as a modular interface, facilitating the replacement and installation of sockets of different specifications. A socket joint 53 is fixedly connected to the center of the bottom of the connecting head 5. The socket joint 53 is used to connect the socket 41 of the locking nut, ensuring that the locking nut can be stably fixed on the socket 41 when applying torque, avoiding slippage or loosening.

[0071] Refer to Figure 5 and Figure 10 , scale lines 741 are evenly arranged around the upper end face of the lower pressing ring 74 along its central axis. The scale lines 741 are used to accurately read the torque value borne by the nut during the test. A pointer 52 is provided on the lower end face of the connecting head 5. By aligning with the scale lines 741, the pointer 52 can display the change of the torque value in real time, facilitating the operator to intuitively observe and record the test results. A second stopper 742 is fixedly connected to the outer periphery of the lower pressing ring 74. The second stopper 742 is engaged with the clamping groove 711 of the base 71 to ensure the stability and position accuracy of the lower pressing ring 74 during the test, avoiding deviation of the test results caused by the movement of the lower pressing ring 74.

[0072] Refer to Figures 2 - 4 , a sliding table 211 is slidably connected to the first guide rail 21. The sliding table 211 adopts a high-precision sliding design to ensure the smooth movement of the fixing plate 31 on the guide rail. The fixing plate 31 is connected to the first guide rail 21 through the sliding table 211, ensuring the stability and consistency of the electric wrench 4 when applying torque. A damping rod 22 connected to the vertical plate 2 is provided on one side of the first guide rail 21. The damping rod 22 is made of high-elastic material and can effectively absorb the vibration and impact generated when applying torque, protecting other components of the device from damage. A positioning handle 33 is rotatably connected to the side plate 32. The positioning handle 33 is designed to conform to ergonomics, facilitating the operator to hold and rotate. A locking head 331 is provided at one end of the positioning handle 33. By contacting the damping rod 22, the locking head 331 realizes the locking and release of the fixing plate 31, ensuring the smooth operation in different test stages.

[0073] Refer to Figure 1 and Figure 4, a through hole 311 is formed through the fixing plate 31, and the diameter of the through hole 311 matches the output end of the electric wrench 4 to ensure that the electric wrench 4 can pass through the through hole 311 smoothly to apply torque; the output end of the electric wrench 4 passes through the through hole 311 to ensure that the torque can be accurately transmitted to the nut; a cable sleeve 34 is arranged at the top of the fixing plate 31, and the cable sleeve 34 is made of high-temperature resistant material to protect the power cord of the electric wrench 4 from high temperature; one end of the cable sleeve 34 is provided with a fixing angle piece 35, and the fixing angle piece 35 is connected to the top of the vertical plate 2 by bolts to ensure the stability and safety of the cable during use and prevent the cable from loosening or winding to affect the operation.

[0074] Refer to Figures 2 - 4 , a second guide rail 25 is fixedly connected to the back of the vertical plate 2, and the second guide rail 25 is arranged parallel to the first guide rail 21 to enhance the overall stability of the device; a counterweight 26 is slidably connected to the second guide rail 25, and the counterweight 26 is designed with adjustable weight and can adjust the balance state of the device according to needs; a first hanging ring 261 is arranged at the top of the counterweight 26, and the first hanging ring 261 is connected to the second hanging ring 321 by a high-strength steel chain to ensure the firmness of the steel rope when applying torque; a second hanging ring 321 is arranged on the side of the side plate 32, and the second hanging ring 321 is connected to the first hanging ring 261 by a steel rope, and the steel rope passes through the deflection wheel 23. The deflection wheel 23 is made of low-friction material to ensure the smoothness and durability of the steel rope during movement; the counterweight 26 can balance the gravity received by the lifting platform 3 and the electric wrench 4, thereby making the up and down sliding of the lifting platform 3 more labor-saving, improving the operation efficiency and reducing the labor intensity of the operator.

[0075] Refer to Figure 2 , a reinforcing plate 11 is symmetrically and fixedly connected between the support plate 1 and the vertical plate 2. The reinforcing plate 11 adopts a high-strength welding process and is firmly connected to the support plate 1 and the vertical plate 2 to enhance the rigidity and stability of the overall structure, prevent deformation or fracture during high-torque application, and ensure the long-term reliable operation of the device.

[0076] Embodiment 2:

[0077] This embodiment details the beneficial effects of the rivet nut torque testing device in terms of high precision and high reliability. By using high-precision ball guide rails (model: SKF Precision Rail PN40) and high-torque output electric wrenches (model: TorqueMaster TM-500), this device achieves high precision in torque application and measurement.

[0078] Working principle and detailed description

[0079] The first guide rail 21 in the device adopts an SKF Precision Rail PN40 ball guide rail with a precision grade of P4 to ensure the smoothness and repeat positioning accuracy of the lifting table 3 during sliding. The electric wrench 4 is selected as the TorqueMasterTM-500 model with a maximum torque output of 500 Nm to meet the test requirements for nuts of different specifications. The torque measuring instrument 6 is equipped with an Omega HMC-Torque sensor with a measurement range of 0-600 Nm and a resolution of 0.1 Nm, ensuring high-precision acquisition of torque data.

[0080] Experimental data

[0081] To verify the high precision and high reliability of the device, the following comparative tests were carried out:

[0082]

[0083] Experimental conditions and control variables

[0084] Ambient temperature: 25°C

[0085] Ambient humidity: 50%

[0086] Nut specification: M10

[0087] Operator: The same operator

[0088] Number of tests: 5 times per group, taking the average value

[0089] From the above experimental data, it can be seen that this device shows extremely low deviation and high repeatability in different torque ranges, verifying its excellent performance of high precision and high reliability.

[0090] Example 3:

[0091] This example details the beneficial effects of the rivet nut torque testing device in batch testing and high efficiency. By designing an annular nut positioning structure and a modular nut mounting base, this device realizes the rapid testing of multiple nuts, greatly improving the testing efficiency.

[0092] Working principle and detailed description

[0093] The nut mounting base 7 is formed by splicing multiple nut positioning blocks 73 into an annular shape. Inside the base 71, there are high-strength nut positioning blocks 73 (material: S45C steel), and the distance between each positioning block 73 is 30 degrees to ensure uniform distribution of the nuts. The base 71 adopts a modular design for easy

[0094] quick splicing and disassembly.

[0095] Experimental data

[0096] To evaluate the batch testing ability of the device, the following tests were conducted:

[0097]

[0098] Experimental conditions and controlled variables

[0099] Ambient temperature: 25 °C

[0100] Ambient humidity: 50%

[0101] Nut specification: M10

[0102] Operator: The same operator

[0103] Number of tests: 5 times per batch, taking the average value

[0104] The experimental results show that the total testing time for 6 nuts per batch is stable between 168 and 186 seconds, the testing time for a single nut is about 30 seconds, and the torque consistency is as high as over 99.6%, proving the high efficiency and high consistency of the device in batch testing.

[0105] Example 4:

[0106] This example details the beneficial effects of the riveting nut torque testing device in terms of structural simplification and low maintenance cost. By using high-strength materials and modular design, the device structure is simplified, reducing the maintenance difficulty and cost.

[0107] Working principle and detailed description

[0108] The main structural components of the device are made of high-strength materials. For example, the support plate 1 and the support column 712 use S45C steel, the fixing plate 31 uses wear-resistant aluminum alloy material, and the sleeve 41 uses high-strength alloy steel. The modular design makes each component easy to disassemble and replace, reducing the complexity of the overall device structure. The counterweight 26 and the steel rope system are quickly installed and adjusted through standardized connectors, further simplifying the device maintenance process.

[0109] Comparison test data

[0110] To verify the structural simplification and reduced maintenance cost of the device, the following comparison tests were conducted:

[0111]

[0112] Experimental conditions and controlled variables

[0113] Maintenance frequency: Once a month

[0114] Maintenance personnel: The same skill level

[0115] Service life of the device: 1 year

[0116] Number of tests: 5 times

[0117] The experimental results show that the annual maintenance time of this device is reduced from 80 hours of the existing device to 30 hours, and the maintenance cost is reduced from 16,000 yuan to 6,000 yuan, with a reduction rate of 62.5%, significantly reducing the maintenance cost.

[0118] Example 5:

[0119] This example details the beneficial effects of the rivet nut torque testing device in terms of nut positioning and torque application process control. Through the precisely designed positioning seat 62, plug-in seat 72 and support column 712, the fixation and stability of the nut during the test are ensured.

[0120] Working principle and detailed description

[0121] The positioning seat 62 adopts high-precision CNC machining technology to ensure precise fit with the plug-in seat 72. The support column 712 is made of S45C steel to provide the necessary supporting force to prevent the nut positioning block 73 from sinking or shifting during the test. The locking handle 33 realizes the locking and release of the fixed plate 31 through the contact between the locking head 331 and the damping rod 22. The lower pressing ring 74 is equipped with scale lines 741 and a pointer 52 to achieve intuitive display of the torque value through mechanical linkage.

[0122] Experimental data

[0123] In order to verify the stability and accuracy of the nut positioning and torque application process, the following comparative tests were carried out:

[0124]

[0125] Experimental conditions and control variables

[0126] Ambient temperature: 25°C

[0127] Ambient humidity: 50%

[0128] Nut specification: M10

[0129] Operator: The same operator

[0130] Number of tests: 5 times per group, taking the average value

[0131] The experimental results show that the offset of nut fixation remains between 0.04 and 0.06 mm, the accuracy of torque display is above 99.7%, and the operation convenience score is between 4.7 and 4.9 points, proving the high stability and high accuracy of the device in the nut positioning and torque application process.

[0132] Example 6:

[0133] This example further verifies the comprehensive performance of the riveted nut torque testing device in terms of high - efficiency batch testing and structural simplification. Through actual production line testing, the excellent performance of the device in practical applications is demonstrated.

[0134] Working principle and detailed description

[0135] In the actual production line, the device is integrated into the automated production line and automated operation is achieved through the PLC control system. Multiple nut positioning blocks 73 are spliced into a circular ring, and the base 71 can quickly fix the nuts, facilitating batch testing of the nuts. The electric wrench 4 is controlled by the PLC to achieve automatic torque application and measurement, and the data is transmitted to the central control system through the industrial Ethernet to realize real - time monitoring and recording of the data.

[0136] Experimental data

[0137] In the actual production environment, the following comprehensive performance tests were carried out:

[0138]

[0139] Experimental conditions and control variables

[0140] Ambient temperature: 25°C

[0141] Ambient humidity: 50%

[0142] Nut specification: M10

[0143] Operator: Automated control

[0144] Number of tests: 5 times per batch, taking the average value

[0145] The comprehensive test results show that the device can efficiently complete the batch testing of 12 nuts in the actual production environment. The total test time is maintained between 5.4 and 5.8 minutes, and the torque consistency is as high as over 99.7%. The annual maintenance time and cost remain stable, further proving the excellent performance of the device in terms of high - efficiency batch testing and structural simplification.

[0146] The working principle of the present invention is:

[0147] When in use, first splice multiple nut positioning blocks 73 into a ring, then snap it into the base 71, and also snap the lower pressing ring 74 into the base 71;

[0148] Press the nut to be measured onto the ring spliced by multiple nut positioning blocks 73, and then install the socket 72 onto the positioning seat 62;

[0149] Next, install the sleeve that matches the nut onto the sleeve joint 53. Then, hold the positioning handle 33 by hand and rotate the positioning handle 33 counterclockwise. As the positioning handle 33 rotates, the locking head 331 will separate from the damping rod 22. Then, let the fixed plate 31 slide downward on the first guide rail 21, thereby driving the electric wrench 4 installed on the fixed plate 31 to move downward synchronously, and make the sleeve installed on the sleeve joint 53 engage with the nut installed on the nut positioning block 73;

[0150] Next, turn on the power switch of the electric wrench 4, and apply torque to the nut installed on the nut positioning block 73 through the electric wrench 4, so that the torque measuring instrument 6 can test the maximum torque borne by the nut;

[0151] During the process of testing the torque borne by the nut, it is divided into two stages. In the early stage, as the torque increases, the nut installed on the nut positioning block 73 does not rotate. However, when the torque exceeds the maximum value of the torque borne by the nut, the nut installed on the nut positioning block 73 will rotate. When the nut rotates, the connecting head 5 will also rotate synchronously. At this time, through the pointer 52 installed at the bottom of the connecting head 5 and the scale line 741 opened on the pressing ring 74, it can be clearly observed that the torque exceeds the maximum value of the nut. After exceeding the maximum value, the power of the electric wrench 4 can be turned off;

[0152] Then, hold the positioning handle 33 by hand and rotate the positioning handle 33 counterclockwise to separate the locking head 331 from the damping rod 22. Then, push the fixed plate 31 upward. Since the counterweight 26 provided on the back of the vertical plate 2 is connected to the side plate 32 by a steel rope, the counterweight 26 can balance the gravity received by the lifting platform 3 and the electric wrench 4, thereby making the up and down sliding of the lifting platform 3 more labor-saving;

[0153] After the test is completed, remove the pressing ring 74 and the nut positioning block 73 from the base 71;

[0154] Then, separate the ring formed by splicing multiple nut positioning blocks 73, which is convenient for removing the tested nut from the nut positioning block 73. When it is necessary to test the torque of a new nut, just splice the nut positioning blocks 73 into a ring.

[0155] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention are implemented according to the conventional means in the art without special instructions and limitations.

Claims

1. A torque test device for a rivet nut, characterized in that: It comprises a support plate (1), the upper end surface of the support plate (1) is connected to a vertical plate (2) at a transverse midline, the side surface of the vertical plate (2) is fixedly connected to a first guide rail (21), and the first guide rail (21) is slidably connected to a lifting platform (3); The lifting platform (3) comprises a fixing plate (31), an electric wrench (4) is mounted on the fixing plate (31), an output end of the electric wrench (4) is connected to a connector (5), and the connector (5) is used to mount a sleeve of a locking nut; A torque measuring instrument (6) is provided on one side of the bottom of the support plate (1); an input end of the torque measuring instrument (6) is connected to a nut mounting seat (7); and the nut mounting seat (7) is used to mount a nut to be measured; The nut mounting seat (7) comprises a base (71), the base (71) is arranged in the shape of a disk with an open top, and a nut positioning block (73) is arranged inside the base (71), the nut positioning blocks (73) are distributed at equal intervals around the central axis of the base (71), and a plurality of the nut positioning blocks (73) are spliced ​​into a circular ring; a lower pressing ring (74) is engaged with the inner top of the base (71); When measuring the torque of the nut, the nut is mounted on a ring formed by splicing a plurality of the nut positioning blocks (73); A mounting frame (24) is connected to one side of the bottom of the vertical plate (2); A locking plate (61) is provided on one side of the torque measuring instrument (6) and is engaged with the mounting frame (24); a locking knob (611) is symmetrically provided on one side of the locking plate (61); the locking knob (611) is used to connect the locking plate (61) to the mounting frame (24); The input end of the torque measuring instrument (6) is provided with a positioning seat (62), a positioning groove (621) is provided at the top center of the positioning seat (62), and stoppers (622) are provided at equal intervals on the upper end surface of the positioning seat (62) around its central axis; The bottom of the base (71) is fixedly connected with a plug socket (72), the plug socket (72) is inserted into the positioning groove (621), and the stoppers (622) are engaged at the four corners of the plug socket (72); The inner bottom of the base (71) is provided with support columns (712) distributed at equal intervals around the central axis of the base (71); When the nut positioning block (73) is installed inside the base (71), the support column (712) abuts against the lower end surface of the nut positioning block (73); The outer side of the base (71) is provided with a locking groove (711) extending therethrough, and the locking grooves (711) are distributed at equal intervals around the central axis of the base (71); The shape of the nut positioning block (73) is set to be fan-shaped; the outer side of the nut positioning block (73) is fixedly connected to a first stopper (734); when the nut positioning block (73) is installed inside the base (71), the first stopper (734) is snapped into the snapping groove (711); One end of the nut positioning block (73) is provided with a splicing groove (731), and the other end of the nut positioning block (73) is fixedly connected with a splicing column (732) matching the splicing groove (731); An arc-shaped groove (733) is provided on the inner side of the nut positioning block (73), and a plurality of the arc-shaped grooves (733) can be spliced ​​into a circle.

2. A torque test device for self-clinching nuts according to claim 1, characterized in that: The output end of the electric wrench (4) is provided with a sleeve (41); A plug connector (51) matching the sleeve (41) is fixedly connected to the top of the connector (5); A sleeve joint (53) is fixedly connected to the center of the bottom of the connector (5), and the sleeve joint (53) is used to connect the sleeve of the locking nut.

3. A torque test device for self-clinching nuts according to claim 1, characterized in that: The upper end surface of the lower pressing ring (74) is provided with scale lines (741) at equal intervals around its axis; The lower end surface of the connector (5) is provided with a pointer (52); The outer periphery of the lower pressing ring (74) is fixedly connected to a second stopper (742), and the second stopper (742) is engaged with the locking groove (711).

4. A torque test device for rivet nuts according to claim 1, characterized in that: A slide table (211) is slidably connected to the first guide rail (21), and a fixed plate (31) is connected to the slide table (211); A damping rod (22) connected to the vertical plate (2) is provided on one side of the first guide rail (21); A positioning handle (33) is rotatably connected to the side plate (32), and a locking head (331) is provided at one end of the positioning handle (33); When the positioning handle (33) is rotated, the locking head (331) abuts against the damping rod (22).

5. A torque test device for self-clinching nuts according to claim 4, characterized in that: The fixing plate (31) is provided with a through hole (311), and the output end of the electric wrench (4) passes through the through hole (311); A cable sleeve (34) is provided at the top of the fixed plate (31), a fixed angle piece (35) is provided at one end of the cable sleeve (34), and the fixed angle piece (35) is connected to the top of the vertical plate (2).

6. A torque test device for self-clinching nuts according to claim 5, characterized in that: The back of the vertical plate (2) is fixedly connected to a second guide rail (25), and a counterweight block (26) is slidably connected to the second guide rail (25); A first hanging ring (261) is arranged on the top of the counterweight block (26), a second hanging ring (321) is arranged on the side of the side plate (32), and a direction-changing wheel (23) is arranged on the top of the vertical plate (2); A steel rope is connected between the first hanging ring (261) and the second hanging ring (321), and the steel rope passes through the direction-changing wheel (23).

7. The torque test device for self-clinching nuts according to claim 1, characterized in that: A reinforcing plate (11) is symmetrically fixedly connected between the support plate (1) and the vertical plate (2).

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