Rivet nut torsion testing device

Abstract

The invention belongs to the technical field of torsion testing, and particularly relates to a rivet nut torsion testing device which comprises a supporting plate, a vertical plate, a first guide rail, a lifting table, a fixing plate, an electric wrench, a connector, a torque measuring instrument, a nut mounting seat and the like. A first guide rail of a high-precision ball guide rail is fixedly connected to the side face of the vertical plate, a lifting table is slidably connected to the first guide rail and comprises 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 with a modular connecting plug, and the connecting plug is matched with a sleeve to adapt to different nuts. The torque measuring instrument is connected with the high-precision sensor through a nut mounting seat, the nut mounting seat is composed of a disc-shaped base and a nut positioning block capable of being spliced, a lower pressing ring and a supporting column are arranged in the base to ensure stable fixation of a nut, the overall structure is made of a high-strength material and is designed in a modularized mode, and the stability, durability and maintainability of the device are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of torque testing, and in particular relates to a torque testing device for a rivet nut. Background Art

[0002] In modern manufacturing, self-clinching nuts are widely used in the connection parts of various mechanical structures. Self-clinching nuts are firmly fixed in a predetermined position by applying a certain torque to ensure the stability and load-bearing capacity of the mechanical structure. In order to ensure the installation quality of self-clinching nuts, the torque applied to them must be accurately tested. At present, the common self-clinching nut torque testing devices on the market mostly use manual operation, manually applying torque and reading the corresponding torque value. This method has problems such as cumbersome operation, low measurement accuracy, and low efficiency.

[0003] Specifically, 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, manual operation makes it difficult to quickly test large quantities of nuts, limiting the improvement of production efficiency. On the other hand, although some automated torque testing devices have improved test efficiency to a certain extent, they have complex structures, high maintenance costs, and in practical applications, it is often difficult to balance test accuracy and ease of operation.

[0004] In addition, the existing torque test device lacks effective control over the nut positioning and torque application process in design, which can easily cause the nut to shift or rotate during the test, affecting the accuracy of the test results. These problems are particularly prominent in application scenarios with high precision requirements. There is an urgent need for a self-clinching nut torque test device that can improve test accuracy, is easy to operate, and is suitable for large-scale nut testing. Summary of the invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a self-rivet nut torque testing device, which can achieve a self-rivet nut torque testing device with reasonable structure, simple operation, high measurement accuracy and suitable for large-scale production.

[0006] To achieve the above object, the present invention provides the following technical solutions: A torque test device for a rivet nut comprises a support plate, a vertical plate is connected to the upper end surface of the support plate at a transverse midline, a first guide rail is fixedly connected to the side surface of the vertical plate, and a lifting platform is slidably connected to the first guide rail; The lifting platform includes a fixing plate, an electric wrench is installed on the fixing plate, an output end of the electric wrench is connected to a connector, and the connector is used to install a sleeve of a locking nut; A torque measuring instrument is arranged on one side of the bottom of the support plate, and an 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; The nut mounting seat includes a base, which is set in a disc shape with an open top, and a nut positioning block is arranged inside the base, the nut positioning blocks are distributed at equal intervals around the central axis of the base, and a plurality of the nut positioning blocks are spliced ​​into a circular ring; a lower pressure ring is clamped on the inner top of the base; When measuring the torque of the nut, the nut is mounted on a ring spliced ​​by a plurality of the nut positioning blocks.

[0007] Furthermore, a mounting frame is connected to one side of the bottom of the vertical plate; A clamping plate that is clamped to the mounting frame is provided on one side of the torque measuring instrument, and a locking knob is symmetrically provided on one side of the clamping plate, and the locking knob is used to connect the clamping plate to the mounting frame; The input end of the torque measuring instrument is provided with a positioning seat, a positioning groove is provided at the top center of the positioning seat, and blocks are provided at equal intervals on the upper end surface of the positioning seat around its central axis; The bottom of the base is fixedly connected with a plug socket, the plug socket is inserted into the positioning groove, and the stoppers are engaged at the four corners of the plug socket.

[0008] Furthermore, the inner bottom of the base is provided with support columns distributed at equal intervals around the central axis of the base; When the nut positioning block is installed inside the base, the support column abuts against the lower end surface of the nut positioning block; The outer side of the base is provided with a clamping groove, which is evenly spaced around the central axis of the base. The shape of the nut positioning block is set to be fan-shaped; the outer side of the nut positioning block is fixedly connected to a first stopper, and when the nut positioning block is installed inside the base, the first stopper is snapped into the snap-in groove; 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 matched with the splicing groove; An arc groove is provided on the inner side of the nut positioning block, and a plurality of the arc grooves can be spliced ​​into a circle.

[0009] Furthermore, the output end of the electric wrench is provided with a sleeve; The top of the connector is fixedly connected with a plug connector that matches the sleeve; A sleeve joint is fixedly connected to the center of the bottom of the connector, and the sleeve joint is used to connect the sleeve of the locking nut.

[0010] Furthermore, the upper end surface of the lower pressure ring is provided with scale lines at equal intervals around its axis; The lower end surface of the connector is provided with a pointer; The outer side of the lower pressing ring is fixedly connected with a second stopper, and the second stopper is engaged with the clamping groove.

[0011] Furthermore, a slide table is slidably connected to the first guide rail, and the fixed plate is connected to the slide table; A damping rod connected to the vertical plate is provided on one side of the first guide rail; A positioning handle is rotatably connected to the side plate, and a locking head is provided at one end of the positioning handle; When the positioning handle is turned, the locking head rests on the damping rod.

[0012] Furthermore, a through hole is formed on the fixing plate, and the output end of the electric wrench passes through the through hole; A cable sleeve is arranged on the top of the fixed plate, a fixed angle piece is arranged on one end of the cable sleeve, and the fixed angle piece is connected to the top of the vertical plate. Furthermore, the back of the vertical plate is fixedly connected to a second guide rail, and a counterweight block is slidably connected to the second guide rail; A first hanging ring is arranged on the top of the counterweight block, a second hanging ring is arranged on the side of the side plate, and a direction-changing wheel is arranged on the top of the vertical plate; A steel rope is connected between the first hanging ring and the second hanging ring, and the steel rope passes through the direction-changing wheel.

[0013] Furthermore, a reinforcing plate is symmetrically fixedly connected between the support plate and the vertical plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects: First of all, in order to address the problems of cumbersome operation and low measurement accuracy of existing manual torque testing devices, this device adopts a first guide rail designed with a high-precision ball guide and a high-precision slide to achieve smooth sliding of the lifting platform; the electric wrench has high torque output capability, and the torque measuring instrument with a high-precision sensor ensures high accuracy of torque application and measurement, thereby improving the consistency and reliability of the test results.

[0015] Secondly, in response to the problem that existing devices are inefficient and difficult to achieve rapid testing of large quantities of nuts, this device is designed with a circular ring structure composed of multiple nut positioning blocks. The base can quickly fix the nuts, making it convenient to carry out batch testing of the nuts; the modular nut mounting seat and the quick-locking socket make it more convenient to replace and install the nuts, greatly improving the testing efficiency and meeting the needs of large-scale production.

[0016] Thirdly, in response to the problems of complex structure and high maintenance cost of existing automated torque testing devices, this device adopts modular components and components made of high-strength materials, such as support plates made of high-strength steel, fixing plates made of wear-resistant materials, and sleeves made of high-strength alloy materials, which simplifies the overall structure and reduces 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.

[0017] Finally, in response to the problem of insufficient control over nut positioning and torque application process in existing devices, the present device ensures the fixation and stability of the nut during the test process through precisely designed positioning seats, connectors and support columns; the coordinated use of the locking handle and damping rod further improves the smoothness and safety of the device's operation in different test stages; the coordination of the scale lines and the pointer on the pressure ring enables the operator to intuitively read and record the torque value, improving the convenience of operation and the accuracy of measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 The structure of the vertical plate of the present invention is schematically shown in FIG. Figure 1 ; Figure 3 The structure of the vertical plate of the present invention is schematically shown in FIG. Figure 2 ; Figure 4 It is a structural schematic diagram of the lifting platform of the present invention; Figure 5 It is a structural schematic diagram of the electric wrench of the present invention; Figure 6 It is a structural schematic diagram of the torque measuring instrument of the present invention; Figure 7 It is a structural schematic diagram of the nut mounting seat of the present invention; Figure 8 It is a structural schematic diagram of the base of the present invention; Fig. 9 This is a schematic diagram of the structure of the nut positioning block of the present invention; Fig.10 It is a structural schematic diagram of the lower pressure ring of the present invention.

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Support plate; 11. Reinforcement plate; 2. vertical plate; 21. first guide rail; 211. slide; 22. damping rod; 23. direction-changing wheel; 24. mounting frame; 25. second guide rail; 26. counterweight; 261. first hanging ring; 3. Lifting platform; 31. Fixing plate; 311. Through hole; 32. Side plate; 321. Second hanging ring; 33. Positioning handle; 331. Locking head; 34. Cable sleeve; 35. Fixed angle piece; 4. Electric wrench; 41. Socket; 5. Connector; 51. Plug connector; 52. Pointer; 53. Sleeve connector; 6. Torque measuring instrument; 61. Positioning plate; 611. Locking knob; 62. Positioning seat; 621. Positioning groove; 622. Stopper; 7. Nut mounting seat; 71. Base; 711. Positioning groove; 712. Support column; 72. Connecting seat; 73. Nut positioning block; 731. Splicing groove; 732. Splicing column; 733. Arc groove; 734. First stopper; 74. Lower pressure ring; 741. Scale line; 742. Second stopper. DETAILED DESCRIPTION

[0020] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0021] Embodiment 1: See also Figure 1-10 A riveted nut torque testing device comprises a support plate 1, which is made of high-strength steel to ensure the stability and durability of the overall structure; a vertical plate 2 is connected to the horizontal center line of the upper end surface of the support plate 1, and the vertical plate 2 is made of aluminum alloy material, which has the characteristics of light weight and high strength, and is convenient for the installation and maintenance of subsequent components; a first guide rail 21 is fixedly connected to the side of the vertical plate 2, and the first guide rail 21 adopts a high-precision ball guide design to ensure that the lifting platform 3 is smooth and unobstructed during the sliding process; a 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, thereby ensuring the accuracy and safety of the test process.

[0022] See also Figure 1-10 The lifting platform 3 includes a fixed plate 31, which is made of wear-resistant material to extend its service life; an electric wrench 4 is installed on the fixed plate 31, and 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 connector 5, and the connector 5 adopts a replaceable design and is suitable for sleeves 41 of various types of locking nuts, ensuring the versatility and flexibility of the device.

[0023] See also Figure 1-10 A torque meter 6 is provided on one side of the bottom of the support plate 1. The torque meter 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 meter 6 is connected to a nut mounting seat 7, and the nut mounting seat 7 is designed as a modular structure to facilitate quick replacement and maintenance; the nut mounting seat 7 is used to install the nut to be measured to ensure that the nut is fixed in position during the test to avoid deviation affecting the test result.

[0024] See also Figure 7-10The nut mounting seat 7 includes a base 71, which is set to be a disc with an open top and is made of corrosion-resistant material to adapt to different working environments; a nut positioning block 73 is arranged inside the base 71, and the nut positioning blocks 73 are evenly spaced around the central axis of the base 71 to ensure that the nuts are evenly distributed on the ring; a plurality of nut positioning blocks 73 are spliced ​​into a circular ring, and the base can quickly fix the nuts, which is convenient for batch testing of nuts; a lower pressure ring 74 is engaged with the inner top of the base 71, and the lower pressure ring 74 is made of high-strength alloy material, which can withstand the high pressure generated during the test and 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 a plurality of nut positioning blocks 73 to ensure that each nut can be tested under uniform conditions, thereby improving the consistency and reliability of the test results.

[0025] See also Figure 7-10 A mounting bracket 24 is connected to one side of the bottom of the vertical plate 2. The mounting bracket 24 is adjustable to accommodate torque meters 6 of different sizes. A positioning plate 61 that is engaged with the mounting bracket 24 is provided on one side of the torque meter 6. The positioning plate 61 is firmly connected to the mounting bracket 24 through a quick locking mechanism, which is convenient for quick installation and disassembly. A locking knob 611 is symmetrically provided on one side of the positioning plate 61. The locking knob 611 is used to connect the positioning plate 61 to the mounting bracket 24 to ensure the stability and safety of the torque meter 6 during the test.

[0026] See also Figure 7-10 The input end of the torque meter 6 is provided with a positioning seat 62, and the positioning seat 62 adopts a high-precision processing technology to ensure accurate cooperation with the plug-in socket 72 of the base 71; a positioning groove 621 is provided at the top center of the positioning seat 62, and the positioning groove 621 is used to accommodate the plug-in socket 72 to ensure accurate positioning of the base 71 during installation; the upper end surface of the positioning seat 62 is provided with blocks 622 at equal intervals around its axis, and the blocks 622 prevent the plug-in socket 72 from tilting or shifting during installation, thereby ensuring the accuracy of torque measurement; the bottom of the base 71 is fixedly connected with the plug-in socket 72, and the plug-in socket 72 adopts a quick locking design, which can be quickly inserted into the positioning groove 621, and the blocks 622 are engaged at the four corners of the plug-in socket 72, further enhancing the stability of the connection, and ensuring a firm connection between the base 71 and the positioning seat 62 when torque is applied.

[0027] See also Figure 7-10The inner bottom of the base 71 is provided with support columns 712 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 support force to prevent the nut positioning block 73 from sinking or shifting during the test; when the nut positioning block 73 is installed inside the base 71, the support columns 712 abut against the lower end surface of the nut positioning block 73 to ensure the fixation and stability of the nut positioning block 73; the outer side of the base 71 is provided with a clamping groove 711, which is evenly spaced around the central axis of the base 71 to facilitate the fixation and splicing of the nut positioning block 73; the shape of the nut positioning block 73 is set to be fan-shaped, The design is adapted to the disc-shaped base 71; a first stopper 734 is fixedly connected to the outer side of the nut positioning block 73, and the first stopper 734 is snapped into the snap-in groove 711 when the nut positioning block 73 is installed inside the base 71, thereby ensuring that the nut positioning block 73 is firmly fixed; a splicing groove 731 is provided at one end of the nut positioning block 73, and the splicing groove 731 cooperates with a splicing column 732 fixedly connected to the other end, thereby ensuring that a plurality of nut positioning blocks 73 can be firmly spliced ​​into a circular ring; an arc groove 733 is provided on the inner side of the nut positioning block 73, and a plurality of arc grooves 733 can be spliced ​​into a circle, thereby further enhancing the stability and integrity of the nut positioning block 73.

[0028] See also Figure 5 A sleeve 41 is provided at the output end of the electric wrench 4. The sleeve 41 is made of high-strength alloy material and can withstand high torque output; a plug connector 51 matching the sleeve 41 is fixedly connected to the top of the connector 5. The plug connector 51 is designed as a modular interface to facilitate the replacement and installation of sleeves of different specifications; a sleeve connector 53 is fixedly connected to the center of the bottom of the connector 5. The sleeve connector 53 is used to connect the sleeve 41 of the locking nut to ensure that the locking nut can be stably fixed on the sleeve 41 when torque is applied to avoid slipping or loosening.

[0029] See also Figure 5 and Fig.10 The upper end surface of the lower pressure ring 74 is provided with scale lines 741 at equal intervals around its axis, and the scale lines 741 are used to accurately read the torque value that the nut is subjected to during the test; the lower end surface of the connector 5 is provided with a pointer 52, and the pointer 52 can display the change of the torque value in real time by aligning with the scale lines 741, so as to facilitate the operator to intuitively observe and record the test results; the outer periphery of the lower pressure ring 74 is fixedly connected with a second stopper 742, and the second stopper 742 is engaged with the positioning groove 711 of the base 71, so as to ensure the stability and position accuracy of the lower pressure ring 74 during the test, and avoid the deviation of the test result due to the movement of the lower pressure ring 74.

[0030] See also Figure 2-4A slide 211 is slidably connected to the first guide rail 21. The slide 211 adopts a high-precision sliding design to ensure the smooth movement of the fixed plate 31 on the guide rail; the fixed plate 31 is connected to the first guide rail 21 through the slide 211, which ensures 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 highly elastic material and can effectively absorb the vibration and impact generated when the torque is applied, protecting other parts of the device from damage; a positioning handle 33 is rotatably connected to the side plate 32. The positioning handle 33 is ergonomically designed to be easy for the operator to hold and rotate; a locking head 331 is provided at one end of the positioning handle 33. The locking head 331 realizes the locking and release of the fixed plate 31 by contacting the damping rod 22, ensuring smooth operation in different test stages.

[0031] See also Figure 1 and Figure 4 A through hole 311 is formed on the fixing plate 31, and the diameter of the through hole 311 matches the output end of the electric wrench 4, ensuring that the electric wrench 4 can smoothly apply torque through the through hole 311; the output end of the electric wrench 4 passes through the through hole 311, ensuring that the torque can be accurately transmitted to the nut; a cable sleeve 34 is provided on 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; 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 by bolts, ensuring the stability and safety of the cable during use, and preventing the cable from loosening or winding and affecting the operation.

[0032] See also Figure 2-4 The back of the vertical plate 2 is fixedly connected with a second guide rail 25, 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 block 26 is slidably connected to the second guide rail 25, and the counterweight block 26 adopts an adjustable weight design, which can adjust the balance state of the device as needed; a first hanging ring 261 is arranged on the top of the counterweight block 26, and the first hanging ring 261 is connected to the second hanging ring 321 through a high-strength steel chain to ensure the firmness of the steel rope when torque is applied; 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 through a steel rope, and the steel rope passes through the changing wheel 23, and the changing wheel 23 is made of low-friction material to ensure the smoothness and durability of the steel rope during movement; the counterweight block 26 can balance the gravity exerted on the lifting platform 3 and the electric wrench 4, so that the up and down sliding of the lifting platform 3 is more labor-saving, improving the operating efficiency and reducing the labor intensity of the operator.

[0033] See also Figure 2A reinforcing plate 11 is symmetrically fixedly connected between the support plate 1 and the vertical plate 2. The reinforcing plate 11 is firmly connected to the support plate 1 and the vertical plate 2 using a high-strength welding process, thereby enhancing the rigidity and stability of the overall structure, preventing deformation or breakage during the application of high torque, and ensuring long-term reliable operation of the device.

[0034] Embodiment 2: This embodiment describes in detail the beneficial effects of the torque test device for rivet nuts in terms of high precision and high reliability. By adopting a high-precision ball guide (model: SKF Precision Rail PN40) and a high-torque output electric wrench (model: TorqueMaster TM-500), the device achieves high precision in torque application and measurement.

[0035] Working principle and detailed description The first guide rail 21 in the device adopts SKF Precision Rail PN40 ball guide rail with an accuracy level of P4, which ensures the stability and repeatability of the lifting platform 3 during the sliding process. The electric wrench 4 uses the TorqueMasterTM-500 model with a maximum torque output of 500 Nm to meet the testing requirements of 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, which ensures the high-precision collection of torque data.

[0036] Experimental data In order to verify the high precision and high reliability of the device, the following comparative tests were carried out:

[0037] Experimental conditions and control variables Ambient temperature: 25℃ Ambient humidity: 50% Nut specification: M10 Operator: Same operator Number of tests: 5 times per group, average value It can be seen from the above experimental data that the device exhibits extremely low deviation and high repeatability within different torque ranges, verifying its superior performance of high precision and high reliability.

[0038] Embodiment 3: This embodiment describes in detail the beneficial effects of the torque test device for riveted nuts in terms of batch testing and high efficiency. By designing a circular ring nut positioning structure and a modular nut mounting seat, the device achieves rapid testing of multiple nuts and greatly improves testing efficiency.

[0039] Working principle and detailed description The nut mounting seat 7 is composed of a plurality of nut positioning blocks 73 spliced ​​into a circular ring. A high-strength nut positioning block 73 (material: S45C steel) is arranged inside the base 71. The spacing between each positioning block 73 is 30 degrees to ensure that the nuts are evenly distributed. The base 71 adopts a modular design, which is convenient for quick installation. Quick assembly and disassembly.

[0040] Experimental data In order to evaluate the batch testing capability of the device, the following tests were performed:

[0041] Experimental conditions and control variables Ambient temperature: 25℃ Ambient humidity: 50% Nut specification: M10 Operator: Same operator Number of tests: 5 times per batch, take the average value The experimental results show that the total test time for each batch of 6 nuts is stable between 168 and 186 seconds, the test 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.

[0042] Embodiment 4: This embodiment describes in detail the beneficial effects of the rivet nut torque test device in terms of simplified structure and low maintenance cost. By adopting high-strength materials and modular design, the device structure is simplified, and the maintenance difficulty and cost are reduced.

[0043] Working principle and detailed description The main structural components of the device are made of high-strength materials, such as the support plate 1 and the support column 712 are made of S45C steel, the fixing plate 31 is made of wear-resistant aluminum alloy material, and the sleeve 41 is made of high-strength alloy steel. The modular design makes it easy to disassemble and replace each component, reducing the complexity of the overall structure of the device. The counterweight block 26 and the steel rope system can be quickly installed and adjusted through standardized connectors, further simplifying the maintenance process of the device.

[0044] Comparative test data In order to verify the simplified structure and reduced maintenance cost of the device, the following comparative tests were conducted:

[0045] Experimental conditions and control variables Maintenance frequency: Once a month Maintenance staff: Same skill level Equipment life: 1 year Number of tests: 5 times 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, a reduction of 62.5%, which significantly reduces the maintenance cost.

[0046] Embodiment 5: This embodiment describes in detail the beneficial effects of the torque test device for rivet nuts in nut positioning and torque application process control. The precisely designed positioning seat 62, plug seat 72 and support column 712 ensure the fixation and stability of the nut during the test.

[0047] Working principle and detailed description The positioning seat 62 adopts high-precision CNC processing technology to ensure accurate matching with the plug seat 72. The support column 712 adopts S45C steel to provide the necessary support 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 fixing plate 31 through the contact between the locking head 331 and the damping rod 22. The lower pressing ring 74 is equipped with a scale line 741 and a pointer 52, and the torque value is intuitively displayed through mechanical linkage.

[0048] Experimental data In order to verify the stability and accuracy of the nut positioning and torque application process, the following comparative tests were conducted:

[0049] Experimental conditions and control variables Ambient temperature: 25℃ Ambient humidity: 50% Nut specification: M10 Operator: Same operator Number of tests: 5 times per group, average value The experimental results show that the offset of the nut fixation is maintained between 0.04 and 0.06 mm, the torque display accuracy is above 99.7%, and the operation convenience score is between 4.7 and 4.9 points, which proves the high stability and high accuracy of the device during nut positioning and torque application.

[0050] Embodiment 6: This embodiment further verifies the comprehensive performance of the riveted nut torque testing device in terms of efficient batch testing and structural simplification, and demonstrates the superior performance of the device in practical applications through actual production line testing.

[0051] Working principle and detailed description 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, which is convenient for batch testing of nuts. The electric wrench 4 is controlled by PLC to achieve automatic torque application and measurement, and the data is transmitted to the central control system through industrial Ethernet to achieve real-time monitoring and recording of data.

[0052] Experimental data In the actual production environment, the following comprehensive performance tests were conducted:

[0053] Experimental conditions and control variables Ambient temperature: 25℃ Ambient humidity: 50% Nut specification: M10 Operator: Automation control Number of tests: 5 times per batch, take the average value Comprehensive test results show that the device can efficiently complete batch testing of 12 nuts in an actual production environment, with the total test time remaining between 5.4 and 5.8 minutes, torque consistency reaching over 99.7%, and annual maintenance time and cost remaining stable, further demonstrating the superior performance of the device in efficient batch testing and structural simplification.

[0054] The working principle of the present invention is: When in use, firstly assemble a plurality of nut positioning blocks 73 into a circular ring, then insert it into the base 71, and also insert the lower pressing ring 74 into the base 71; Press the nut to be measured into the ring composed of a plurality of nut positioning blocks 73, and then install the plug socket 72 onto the positioning socket 62; Then, install the sleeve matched with 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, and then let the fixing plate 31 slide downward on the first guide rail 21, thereby driving the electric wrench 4 installed on the fixing plate 31 to move downward synchronously, and let the sleeve installed on the sleeve joint 53 engage with the nut installed on the nut positioning block 73; Then, the power switch of the electric wrench 4 is turned on, and the electric wrench 4 applies torque to the nut mounted on the nut positioning block 73, so that the torque measuring instrument 6 can test the maximum torque borne by the nut; The process of testing the torque of the nut 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. When the torque exceeds the maximum torque of the nut, the nut installed on the nut positioning block 73 will rotate. When the nut rotates, the connector 5 will also rotate synchronously. At this time, through the pointer 52 installed at the bottom of the connector 5 and the scale line 741 opened on the lower pressure ring 74, it can be clearly observed that the torque exceeds the maximum value of the nut. When it exceeds the maximum value, the power of the electric wrench 4 can be turned off; Then hold the positioning handle 33 with your hand and turn the positioning handle 33 counterclockwise to separate the locking head 331 from the damping rod 22, and then push the fixing plate 31 upward. Since the counterweight block 26 set on the back of the vertical plate 2 and the side plate 32 are connected by a steel rope, the counterweight block 26 can balance the gravity exerted on the lifting platform 3 and the electric wrench 4, thereby making the lifting platform 3 slide up and down more labor-saving; After the test is completed, the lower pressing ring 74 and the nut positioning block 73 are removed from the base 71; Then separate the circular ring formed by splicing multiple nut positioning blocks 73, so that it is convenient to remove the tested nut from the nut positioning block 73. When a torque test is required for a new nut, just press the nut positioning blocks 73 to splice into a ring.

[0055] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

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).

2. A torque test device for self-clinching nuts according to claim 1, characterized in that: 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 to a socket (72), the socket (72) is inserted into the positioning groove (621), and the stoppers (622) are engaged at the four corners of the socket (72).

3. A torque test device for self-clinching nuts according to claim 1, characterized in that: 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.

4. A torque test device for rivet 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.

5. The 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).

6. The torque test device for self-clinching 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).

7. A torque test device for self-clinching nuts according to claim 6, 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).

8. The torque test device for self-clinching nuts according to claim 7, 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).

9. 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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