A fall-resistant screw torque testing device
By introducing positioning and driving components into the slip screw torque testing device, the problem of positional displacement caused by substrate wear was solved, enabling precise positioning and stable testing of the substrate, and improving the accuracy and efficiency of the test results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU HUOYU METAL PRODUCTS CO LTD
- Filing Date
- 2025-10-09
- Publication Date
- 2026-07-14
AI Technical Summary
Existing screw torque testing devices suffer from positional shifts caused by wear on the substrate and positioning device, affecting the accuracy and reliability of test results.
The system employs positioning and driving components, including a limiting plate, sliding block, push plate, limiting plate, and driving rotation plate, to ensure that the substrate remains stably positioned during testing. The precise positioning and automatic reset of the substrate are achieved through the cooperation of the limiting rod and spring.
This improves the accuracy and efficiency of torque testing for screws, prevents substrate displacement during testing, and ensures the reliability of test results.
Smart Images
Figure CN224499758U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of screw torque testing technology, and in particular to a screw torque testing device. Background Technology
[0002] The torque testing of Narrow screws currently differs from that of ordinary screws because their primary function is to prevent loosening through the anti-loosening adhesive (or structural design) applied to the surface, rather than relying on the engagement strength between the screw and the material itself. Existing tests use a substrate with pre-drilled threaded holes to simulate the fit between the screw and a standard threaded hole in actual assembly scenarios, focusing on testing the anti-slip performance of the anti-loosening adhesive under a specified torque and the torque decay. This differs from the torque test performed by directly drilling into the wood or breaking off ordinary screws, as this method cannot accurately reflect the effectiveness of the anti-loosening adhesive and can lead to data distortion due to material differences (such as the randomness of the fiber structure of wood), deviating from the core performance testing principle of Narrow screws: "preventing loosening rather than causing damage."
[0003] During long-term continuous testing of screws, the substrate of the screw plate experiences wear and deformation due to repeated mechanical stress from screw installation and torque testing. Regular replacement is necessary to ensure testing accuracy. During this process, the positioning device between the substrate and the limiting substrate generates continuous friction due to repeated disassembly and assembly. The edges of the positioning device gradually show wear. Because the substrate is frequently replaced while the positioning device remains the same, the positioning device suffers more wear, while the substrate remains largely untouched. As wear intensifies, the contact area between the positioning device and the substrate thins, creating a microscopic gap invisible to the naked eye. This causes a slight displacement of the substrate within the installation area defined by the positioning device, preventing it from accurately maintaining its position at the test center. This positional shift directly causes an angular deviation between the threaded hole on the substrate and the force axis of the screw torque tester. When torque is applied to the screw, the threaded hole experiences non-coaxial torque due to this displacement, resulting in significant fluctuations in the measured torque value compared to the true torque. This severely affects the accuracy and reliability of the screw torque test results. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model provides a device for testing the torque of a slip-resistant screw.
[0005] This utility model is achieved using the following technical solution: a torque testing device for a screw, comprising a base plate, a screw torque tester for testing the torque of a screw on the top of the base plate, a base plate for assisting the screw in torque testing on the top of the base plate, a threaded hole adapted to the screw on the top of the base plate, limiting plates for limiting the position of the base plate at the four corners of the base plate, each limiting plate being fixedly installed with the base plate, positioning components for assisting the positioning of the base plate on the four sides of the base plate, a driving component for simultaneously driving all positioning components to move on the top of the base plate, four sliding grooves arranged in a circular array on the top of the base plate, each positioning component including a sliding block slidably disposed inside the sliding groove, a pushing plate fixedly installed on the top of the sliding block, and a limiting plate fixedly installed on one end of the pushing plate.
[0006] With the above technical solution, when the substrate needs to be positioned, the driving component drives the positioning component to move, and the limiting plate can cooperate with the limiting plate to accurately position the substrate, ensuring that the substrate remains stable during the test and improving the accuracy of the test results.
[0007] As a further improvement to the above solution, the limiting plate has slots at both ends on the side near the substrate, and both slots are adapted to the adjacent limiting plate. One side of the limiting plate is in contact with the substrate.
[0008] Through the above technical solution, the matching setting of the slot and the limiting plate can further improve the stability of the substrate positioning. When the limiting plate becomes thinner, the substrate will shift, but the thickness of the limiting plate does not change because it does not rub against the substrate, and it will still push the substrate to the center position. The slot on the outside of the limiting plate can prevent the limiting plate from pushing the substrate excessively and prevent the substrate from shifting during the test.
[0009] As a further improvement to the above solution, a limiting rod is fixedly installed inside each of the sliding grooves, each of the sliding blocks is slidably sleeved on the adjacent limiting rod, and a spring is sleeved on each of the limiting rods, with the two ends of each spring abutting against the adjacent sliding block and the inner wall of the sliding groove, respectively.
[0010] Through the above technical solution, the limiting rod can guide the sliding block to slide in a straight line, and the spring can automatically reset the positioning component after the driving component stops driving, which is convenient for the next use.
[0011] As a further improvement to the above solution, the driving assembly includes a rotating plate arranged in a ring on the top of the base plate. The bottom side of the rotating plate has a receiving groove, and each of the push plates is located inside the receiving groove. The rotating plate has four push ports arranged in a ring array. Each push port has a push column inside, and the bottom end of each push column is fixedly installed to the top of the adjacent push plate.
[0012] Through the above technical solution, rotating the rotating plate drives the pushing column to move, and the pushing column pushes the pushing plate, thereby moving the positioning component. This allows the positioning component to slide outwards with a single rotation, making it convenient to place the substrate between the limiting plates and avoiding friction between the substrate and the limiting plates.
[0013] As a further improvement to the above scheme, each of the aforementioned push ports is arranged in an arc shape.
[0014] Through the above technical solution, the arc-shaped push port can make the push column move more smoothly during the process, avoid jamming, and ensure the normal operation of the drive component.
[0015] As a further improvement to the above solution, a connecting ring is fixedly installed on the cylindrical surface of the rotating plate, and a limiting ring that is fixedly installed on the bottom plate is rotatably sleeved on the top of the connecting ring.
[0016] Through the above technical solution, the setting of the connecting ring and the limiting ring can make the rotating plate more stable during rotation, prevent the rotating plate from shaking, and ensure the driving effect of the driving component.
[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0018] This invention, by setting up positioning components and driving components, can accurately position the substrate each time, improving the accuracy of test results. At the same time, the driving component can drive all positioning components simultaneously, making operation convenient and improving testing efficiency. The setting of limit rods and springs can make the positioning components slide stably and automatically reset, ensuring the normal use of the device. Attached Figure Description
[0019] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0020] Figure 2 This is a schematic diagram of the structure of the present invention with a limiting plate;
[0021] Figure 3 This is a schematic diagram of the structure of the present invention with a positioning component;
[0022] Figure 4 This is a cross-sectional structural diagram of the present invention with a drive component.
[0023] Explanation of key symbols:
[0024] 1. Base plate; 2. Screw torque tester; 3. Base plate; 4. Limiting plate; 501. Sliding block; 502. Pushing plate; 503. Limiting plate; 601. Rotating plate; 602. Pushing port; 603. Pushing column; 7. Sliding groove; 8. Limiting rod; 9. Spring; 10. Connecting ring; 11. Limiting ring. Detailed Implementation
[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.
[0026] Please combine Figures 1-4 This embodiment of a torque testing device for a ductile screw includes a base plate 1. A screw torque tester 2, capable of testing the torque of ductile screws, is mounted on the top of the base plate 1. The screw torque tester 2 performs torque testing on the ductile screws as follows:
[0027] I. Preparations before the test
[0028] Equipment and tool inspection
[0029] Calibrate the torque tester (such as an electric torque wrench, digital torque meter, etc.) to ensure that its accuracy meets the standards (usually with an error range of ≤±1%).
[0030] Prepare pre-made threaded hole base plates that meet specifications (the materials are mostly metals, such as aluminum alloys and steel, the hole diameter matches the nominal diameter of the screw, and the thread precision is processed according to standards).
[0031] Confirm the specifications of the Narrow screws (diameter, length, thread pitch), the type of anti-loosening coating (such as nylon glue, resin coating, etc.), and the testing standards required by the manufacturer (such as ISO, ASTM, or internal standards).
[0032] Substrate and screw pretreatment
[0033] There should be no oil, debris or coating residue inside the threaded holes of the substrate. If necessary, wipe them clean with alcohol.
[0034] If there is dust or impurities on the surface of the screws, wipe them with a lint-free cloth to avoid affecting the performance of the anti-loosening adhesive.
[0035] II. Testing Process
[0036] Mounting substrate and fixing tester
[0037] The substrate is fixed on the test platform.
[0038] The drive head (such as a socket or bit) of the torque tester must be matched with the screw head to avoid slippage or damage to the screw.
[0039] Operating steps for applying torque
[0040] Pre-tightening stage: Slowly screw the Narrow screw into the pre-threaded hole with a low torque (about 50% of the target torque) to avoid deformation of the anti-loosening adhesive due to excessive initial resistance.
[0041] Uniform loading: Gradually increase the torque at a standard rate (e.g., 2-5 N·m / s), while simultaneously recording the torque-angle curve or torque value changes in real time.
[0042] Target torque holding: When the torque reaches the preset value (such as the minimum anti-loosening torque specified by the manufacturer or the rated torque), hold it for 10-15 seconds and observe whether there are phenomena such as stripping or torque decay.
[0043] Reverse test (optional): Some tests require a reverse loosening operation to record the maximum torque (i.e., anti-loosening torque) during loosening in order to evaluate the stopping effect of the anti-loosening adhesive.
[0044] Data acquisition and monitoring
[0045] The tester automatically records the peak torque, torque attenuation (such as the torque reduction during the holding phase), and whether any abnormalities such as slippage or thread damage occur during the tightening process.
[0046] III. Derivation and Determination of Test Results
[0047] Core Judgment Indicators
[0048] Tightening torque qualification standard: During the screw-in process, the torque must rise steadily to the target value without sudden drops or abnormal fluctuations. For example, if the standard requires a minimum anti-loosening torque of 8 N·m, the measured peak torque must not be lower than this value.
[0049] Anti-loosening performance verification: When maintaining the target torque, the screw should not rotate or loosen; the torque when loosening in the reverse direction should reach the specified value (e.g., more than 80% of the tightening torque) to prove that the anti-loosening adhesive is effectively engaged.
[0050] Torque attenuation control: Some standards require that the torque attenuation should not exceed 10% (e.g., from 10 N·m to within 9 N·m), otherwise it is considered that the anti-loosening performance is insufficient.
[0051] Abnormal situation handling
[0052] If the torque suddenly drops during screwing, it may be due to partial detachment of the anti-loosening adhesive or damage to the threaded hole. The condition of the screw and the base plate needs to be checked.
[0053] If stripping occurs because the torque cannot reach the target value, it may be due to a mismatch between the screw and the threaded hole or failure of the anti-loosening adhesive. In this case, it is necessary to retest or replace the sample.
[0054] Results Recording and Statistics
[0055] Each test should be repeated 3-5 times, and the average value should be taken as the final result. The standard deviation should also be recorded to assess the data dispersion.
[0056] By comparing the screws with manufacturer standards or industry specifications, determine whether the screws meet the anti-loosening performance requirements and generate a test report (including torque curve, peak data, and description of abnormal conditions).
[0057] The base plate 1 has a base plate 3 on its top that can assist the screw in torque testing. The base plate 3 has a threaded hole on its top that is compatible with the screw. The base plate 3 has a limiting plate 4 at each of its four corners to limit the position of the base plate 3. Each limiting plate 4 is fixedly installed to the base plate 1. The base plate 3 has positioning components on its four sides that can assist in positioning the base plate 3. The base plate 1 has a driving component on its top that can simultaneously drive all positioning components to move.
[0058] The top of the base plate 1 has four sliding grooves 7 arranged in a circular array. The positioning component includes a sliding block 501 slidably disposed inside the sliding groove 7. A push plate 502 is fixedly installed on the top of the sliding block 501, and a limiting plate 503 is fixedly installed on one end of the push plate 502. When the substrate 3 needs to be positioned, the driving component drives the positioning component to move. The limiting plate 503 can cooperate with the limiting plate 4 to accurately position the substrate 3, ensuring that the substrate 3 remains stable during the test and improving the accuracy of the test results. The limiting plate 503 is close to the substrate 3. Both ends of one side are provided with slots, and both slots are adapted to the adjacent limiting plate 4. One side of the limiting plate 503 is in contact with the substrate 3. The matching of the slots and the limiting plate 4 can further improve the positioning stability of the substrate 3. When the limiting plate 4 becomes thinner, the substrate 3 will shift, but the thickness of the limiting plate 503 does not change because it does not rub against the substrate 3, and it will still push the substrate 3 to the center position. The outer side of the limiting plate 4, in conjunction with the slots, can prevent the limiting plate 503 from excessively pushing the substrate 3 and prevent the substrate 3 from shifting during the test.
[0059] Each sliding groove 7 has a fixed limiting rod 8 installed inside. Each sliding block 501 is slidably sleeved on the adjacent limiting rod 8. Each limiting rod 8 is sleeved with a spring 9. The two ends of each spring 9 abut against the adjacent sliding block 501 and the inner wall of the sliding groove 7, respectively. The limiting rod 8 can guide the sliding of the sliding block 501 to ensure that the sliding block 501 slides in a straight line. The setting of the spring 9 can enable the positioning component to automatically reset after the driving component stops driving, which is convenient for the next use.
[0060] The driving assembly includes a rotating plate 601 arranged in a ring on the top of the base plate 1. A receiving groove is formed on the bottom side of the rotating plate 601, and each push plate 502 is located inside the receiving groove. Four push ports 602 are arranged in a ring array on the rotating plate 601. Each push port 602 contains a push post 603. The bottom end of each push post 603 is fixedly installed to the top of the adjacent push plate 502. Rotating the rotating plate 601 causes the push ports 602 to move the push posts 603, which in turn push the push plates 502, thus moving the positioning assembly. This allows the entire positioning assembly to slide outwards with a single rotation, facilitating the placement of the substrate 3 between the limiting plates 4 and preventing friction between the substrate 3 and the limiting plates 503. Each push port 602 is arc-shaped, which allows the push posts 603 to move more smoothly, preventing jamming and ensuring the normal operation of the driving assembly.
[0061] A connecting ring 10 is fixedly installed on the cylindrical surface of the rotating plate 601. A limiting ring 11, which is fixedly installed on the bottom plate 1, is rotatably sleeved on the top of the connecting ring 10. The setting of the connecting ring 10 and the limiting ring 11 can make the rotating plate 601 more stable during rotation, prevent the rotating plate 601 from shaking, and ensure the driving effect of the driving component.
[0062] The implementation principle of the torque testing device for a fall screw in this embodiment is as follows: Rotating the rotating plate 601, the pushing port 602 will push the pushing column 603. The movement of the pushing column 603 will move the pushing plate 502, and the pushing plate 502 will move the sliding block 501. Since the sliding block 501 is inside the sliding groove 7, it can only move along the sliding groove 7, thus realizing the linear movement of the sliding block 501. After the sliding block 501 moves, it will compress the spring 9, and the limiting plate 503 will move away from the limiting plate 4. Then, the base plate 3 is placed on the bottom plate 1, so that its four corners contact the limiting plate 4 for initial positioning.
[0063] Then, the rotating plate 601 is released. Under the elastic force of the spring 9, the sliding block 501 drives the push plate 502 and the limiting plate 503 to reset. The movement of the push plate 502 will cause the rotating plate 601 to rotate in the opposite direction. At this time, the push plate 502 drives the limiting plate 503 to move until the slot of the limiting plate 503 engages with the limiting plate 4. One side of the limiting plate 503 is in contact with the substrate 3, thus completing the precise positioning of the substrate 3.
[0064] Because when the contact area between the limiting plate 4 and the substrate 3 becomes thinner, and there is a gap between them that is difficult to observe with the naked eye, the position of the substrate 3 inside the limiting plate 4 will shift. However, the thickness of the limiting plate 503 does not change because it does not rub against the substrate 3, and it will still push the substrate 3 to the center position. The outer side of the limiting plate 4, in conjunction with the slot, can prevent the limiting plate 503 from excessively pushing the substrate 3 and prevent the substrate 3 from being pushed and displaced by the limiting plate 503 during the test. This ensures that the substrate 3 is always in the center position and can align with the screw.
[0065] At this point, the screw is installed in the threaded hole of the substrate 3, and a torque test is performed using the screw torque tester 2. After the test is completed, the rotating plate 601 is rotated again, which allows the limiting plate 503 to move away from the substrate 3, thereby removing the substrate 3.
[0066] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.
Claims
1. A torque testing device for a screw, comprising a base plate (1), wherein a screw torque tester (2) capable of testing the torque of a screw is provided on the top of the base plate (1), a base plate (3) capable of assisting the screw in torque testing is provided on the top of the base plate (1), a threaded hole adapted to the screw is provided on the top of the base plate (3), and a limiting plate (4) for limiting the position of the base plate (3) is provided at each of the four corners of the base plate (3), and each limiting plate (4) is fixedly installed to the base plate (1), characterized in that, The substrate (3) is provided with positioning components on all four sides for assisting in positioning the substrate (3). The top of the base plate (1) is provided with a driving component that can simultaneously drive all positioning components to move. The top of the base plate (1) is provided with four sliding grooves (7) arranged in a circular array. The positioning component includes a sliding block (501) slidably disposed inside the sliding groove (7). A push plate (502) is fixedly installed on the top of the sliding block (501). A limiting plate (503) is fixedly installed on one end of the push plate (502).
2. The device for testing the torque of a slip-resistant screw as described in claim 1, characterized in that, The limiting plate (503) has slots at both ends on the side near the substrate (3), and both slots are adapted to the adjacent limiting plate (4). One side of the limiting plate (503) is in contact with the substrate (3).
3. The device for testing the torque of a slip-resistant screw as described in claim 1, characterized in that, Each of the sliding grooves (7) is fixedly installed with a limiting rod (8), each of the sliding blocks (501) is slidably sleeved on the adjacent limiting rod (8), and each of the limiting rods (8) is sleeved with a spring (9), with the two ends of each spring (9) abutting against the adjacent sliding block (501) and the inner wall of the sliding groove (7) respectively.
4. The device for testing the torque of a slip-resistant screw as described in claim 1, characterized in that, The drive assembly includes a rotating plate (601) arranged in a ring on the top of the base plate (1). The rotating plate (601) has a receiving groove on its bottom side. Each push plate (502) is located inside the receiving groove. The rotating plate (601) has four push ports (602) arranged in a ring array. Each push port (602) has a push post (603) inside it. The bottom end of each push post (603) is fixedly installed to the top of the adjacent push plate (502).
5. The device for testing the torque of a slip-resistant screw as described in claim 4, characterized in that, Each of the aforementioned push ports (602) is arranged in an arc shape.
6. The device for testing the torque of a slip-resistant screw as described in claim 4, characterized in that, A connecting ring (10) is fixedly installed on the cylindrical surface of the rotating plate (601), and a limiting ring (11) fixedly installed on the bottom plate (1) is rotatably sleeved on the top of the connecting ring (10).