Bolt pretightening force connection tightness testing device
By designing an adjustable test frame and spring structure, combined with pressure and torque sensors, the problem of existing devices being unable to adapt to bolts of different sizes has been solved. This enables accurate measurement of bolt preload and stable installation, ensuring the reliability and safety of the test.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-07
- Publication Date
- 2026-03-17
AI Technical Summary
Existing bolt preload connection tightness testing devices are usually equipped with fixed-size test frames, which cannot accommodate bolts of different sizes. This results in bolts not being able to be installed securely, affecting the normal conduct of the test, and may even cause them to loosen or fall off, leading to equipment damage and safety hazards.
A bolt preload connection tightness testing device was designed. It achieves stable installation of bolts of different sizes through an adjustable test frame and spring structure, and combines pressure sensor and torque sensor for accurate testing. The device includes a detachable test frame, elastic telescopic rod and motor-driven torque sensor to achieve accurate measurement of bolt preload.
It enables the secure installation and precise testing of bolts of different sizes, preventing bolts from loosening or falling off, and ensuring the reliability and safety of the test.
Smart Images
Figure CN224004568U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bolt preload testing technology, specifically a bolt preload connection tightness testing device. Background Technology
[0002] In numerous fields such as machinery manufacturing, construction engineering, and the automotive industry, bolted connections are a common and crucial type of connection. The magnitude of the preload directly affects the reliability, stability, and safety of the connection structure. To ensure that bolted connections meet design requirements, bolt preload connection tightness testing devices play a vital role. They can accurately measure bolt preload, determine the tightness of the connection, and prevent equipment failures and safety accidents caused by improper preload.
[0003] Existing bolt preload connection tightness testing devices are typically equipped with fixed-size test frames to hold the bolts to be tested. However, in actual production and applications, bolts come in a wide variety of sizes, ranging from tiny electronic device bolts to high-strength, large-size bolts used in large machinery, with significant differences. When testing bolts of different sizes, if the test frame cannot be adapted to the specific bolt size, the bolts may not be securely mounted on the test frame, affecting the normal progress of the test. In some cases, the bolts may even loosen or fall off during the test, causing equipment damage and safety hazards. Therefore, we propose a bolt preload connection tightness testing device. Utility Model Content
[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a bolt preload connection tightness testing device that is easy to replace. This device solves the problem that existing bolt preload connection tightness testing devices typically use fixed-size test frames to hold the bolts to be tested. However, in actual production and applications, bolts come in a wide variety of sizes, from tiny electronic device bolts to high-strength, large-size bolts used in large machinery, with significant differences. When testing bolts of different sizes, if the test frame cannot be adapted to the specific bolt size, the bolts may not be securely mounted on the test frame, affecting the normal conduct of the test. Furthermore, bolts may loosen or fall off during the test, causing equipment damage and safety hazards.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a bolt preload connection tightness testing device, comprising a workbench, a fixed frame fixedly connected to the rear side of the top of the workbench, first springs fixedly connected to both sides of the fixed frame, a connecting frame fixedly connected to one side of the first spring, an adjusting rod fixedly connected to one side of the connecting frame, a movable rod movably connected to one side of the adjusting rod, a connecting seat movably connected to one side of the movable rod, a second spring fixedly connected to the bottom of the connecting seat, the bottom of the second spring fixedly connected to the fixed frame, a pin fixedly connected to the inner side of the adjusting rod, a test frame inserted into the surface of the pin, and the bottom of the test frame inserted into the workbench.
[0006] Preferably, a pressure sensor is fixedly connected to the central axis of the top of the workbench, a disc is fixedly connected to the top of the pressure sensor, a third spring is fixedly connected to the top of the disc, a connecting plate is fixedly connected to the top of the third spring, a bracket is fixedly connected to the outer side of the top of the workbench, an elastic telescopic rod is fixedly connected to the top of the bracket, a rectangular plate is fixedly connected to the bottom of the elastic telescopic rod, a motor is fixedly connected to the top of the rectangular plate, a torque sensor is fixedly connected to the output end of the motor, a fixed seat is fixedly connected to the bottom of the torque sensor, a sleeve is inserted into the bottom of the fixed seat, and screws are threaded into the inner cavities of both the sleeve and the fixed seat.
[0007] Preferably, rectangular grooves are provided on both sides of the fixing frame, and the inner cavity of the rectangular grooves is slidably connected to the connecting frame.
[0008] Preferably, the inner cavity of the connecting seat is slidably connected to a slide rod, and the bottom of the slide rod is fixedly connected to the fixing frame.
[0009] Preferably, the inner cavity of the adjusting rod is slidably connected to a crossbar, and one side of the crossbar is fixedly connected to the fixing frame.
[0010] Preferably, a balance frame is fixedly connected to the outer side of the bottom of the connecting plate, and the surface of the balance frame is slidably connected to the worktable.
[0011] Compared with the prior art, this utility model provides a bolt preload connection tightness testing device, which has the following beneficial effects:
[0012] 1. When the test frame needs to be replaced, press down on the connecting seat. The connecting seat moves the movable rod, which in turn moves the adjusting rod. The adjusting rod moves the pin away from the test frame. Then, move the test frame upward to complete the disassembly. Insert the replaced test frame into the workbench, and then release the connecting seat. At this time, the second spring pushes the connecting seat to move, which in turn moves the movable rod. The movable rod moves the adjusting rod, and the first spring pulls the connecting frame to move. The connecting frame also moves the adjusting rod, which in turn causes the pin to insert into the replaced test frame, making the test frame stable.
[0013] 2. This utility model moves the rectangular plate upwards, causing the sleeve to rise. The screws can then be removed, and the sleeve replaced. After replacement, the torque and pressure values are set via an external PLC controller. The bolt to be tested is then connected to the test frame. The rectangular plate is then released, and the elastic telescopic rod's thrust causes the rectangular plate to descend, allowing the sleeve to engage with the bolt. The motor is then started, driving the torque sensor to rotate, which in turn rotates the sleeve, causing the bolt to rotate. During this rotation, the bolt descends, causing the connecting plate to descend as well. The connecting plate causes the third spring to deform, resulting in a change in pressure detected by the pressure sensor. Once the torque sensor detects a torque value matching the set value, the motor stops. The preload test is then completed by observing whether the pressure value detected by the pressure sensor matches the set value. Attached Figure Description
[0014] Figure 1 This is a three-dimensional structural diagram of the present invention from a first-person perspective.
[0015] Figure 2 This is a three-dimensional structural diagram of the present invention from a second perspective.
[0016] Figure 3 This is a three-dimensional structural diagram of the present invention from a third-view perspective.
[0017] In the diagram: 1. Workbench; 2. Fixed frame; 3. First spring; 4. Connecting frame; 5. Adjusting rod; 6. Movable rod; 7. Connecting seat; 8. Second spring; 9. Pin; 10. Test frame; 11. Disc; 12. Third spring; 13. Connecting plate; 14. Bracket; 15. Elastic telescopic rod; 16. Rectangular plate; 17. Motor; 18. Torque sensor; 19. Fixed seat; 20. Sleeve; 21. Screw; 22. Pressure sensor. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.
[0020] Example 1:
[0021] Please see Figure 1 and Figure 3 As shown, this utility model provides a bolt preload connection tightness testing device, including a workbench 1, a fixed frame 2 fixedly connected to the rear side of the top of the workbench 1, a first spring 3 fixedly connected to both sides of the fixed frame 2, a connecting frame 4 fixedly connected to one side of the first spring 3, an adjusting rod 5 fixedly connected to one side of the connecting frame 4, a movable rod 6 movably connected to one side of the adjusting rod 5, a connecting seat 7 movably connected to one side of the movable rod 6, a second spring 8 fixedly connected to the bottom of the connecting seat 7, the bottom of the second spring 8 fixedly connected to the fixed frame 2, a pin 9 fixedly connected to the inner side of the adjusting rod 5, a test frame 10 inserted into the surface of the pin 9, the bottom of the test frame 10 inserted into the workbench 1, rectangular slots are provided on both sides of the fixed frame 2, and the inner cavity of the rectangular slot is slidably connected to the connecting frame 4, a sliding rod is slidably connected to the inner cavity of the connecting seat 7, and the bottom of the sliding rod is fixedly connected to the fixed frame 2, and a crossbar is slidably connected to the inner cavity of the adjusting rod 5, and one side of the crossbar is fixedly connected to the fixed frame 2.
[0022] The specific function of this technical solution is as follows: When the test frame 10 needs to be replaced, press down on the connecting seat 7. The connecting seat 7 drives the movable rod 6 to move, the movable rod 6 drives the adjusting rod 5 to move, and the adjusting rod 5 drives the pin 9 away from the test frame 10. Then, move the test frame 10 upward to complete the disassembly. Insert the replaced test frame 10 into the workbench 1, and then release the connecting seat 7. At this time, the second spring 8 pushes the connecting seat 7 to move, the connecting seat 7 drives the movable rod 6 to move, the movable rod 6 drives the adjusting rod 5 to move, and at the same time, the first spring 3 pulls the connecting frame 4 to move. The connecting frame 4 also drives the adjusting rod 5 to move, thereby driving the pin 9 to insert into the replaced test frame 10, making the test frame 10 stable.
[0023] Example 2:
[0024] Based on Embodiment 1, this utility model is as follows: Figure 1 and Figure 2 As shown, a pressure sensor 22 is fixedly connected to the central axis at the top of the workbench 1. A disc 11 is fixedly connected to the top of the pressure sensor 22. A third spring 12 is fixedly connected to the top of the disc 11. A connecting plate 13 is fixedly connected to the top of the third spring 12. A bracket 14 is fixedly connected to the outer side of the top of the workbench 1. An elastic telescopic rod 15 is fixedly connected to the top of the bracket 14. A rectangular plate 16 is fixedly connected to the bottom of the elastic telescopic rod 15. A motor 17 is fixedly connected to the top of the rectangular plate 16. A torque sensor 18 is fixedly connected to the output end of the motor 17. A fixed seat 19 is fixedly connected to the bottom of the torque sensor 18. A sleeve 20 is inserted into the bottom of the fixed seat 19. Screws 21 are threaded into the inner cavities of both the sleeve 20 and the fixed seat 19. A balance frame is fixedly connected to the outer side of the bottom of the connecting plate 13, and the surface of the balance frame is slidably connected to the workbench 1.
[0025] The specific function of this technical solution is as follows: Moving the rectangular plate 16 upwards allows the sleeve 20 to rise, enabling the screw 21 to be removed and the sleeve 20 to be replaced. After replacement, the torque and pressure values are set via the external PLC controller. The bolt to be tested is then connected to the test frame 10. Subsequently, the rectangular plate 16 is released, and the thrust of the elastic telescopic rod 15 causes the rectangular plate 16 to descend, allowing the sleeve 20 to engage with the bolt. Then, the motor 17 is started, driving the torque sensor 18 to rotate, which in turn causes the sleeve 20 to rotate. The sleeve 20 drives the bolt to rotate, and during the bolt's rotation, it descends, causing the connecting plate 13 to descend as well. The connecting plate 13 causes the third spring 12 to deform, resulting in the pressure sensor 22 detecting a change in pressure. Once the torque sensor 18 detects that the torque value matches the set value, the motor 17 stops. At this point, the pressure value detected by the pressure sensor 22 is observed to ensure it matches the set value, thus completing the preload test.
[0026] Working principle: When the test frame 10 needs to be replaced, press down on the connecting seat 7. The connecting seat 7 drives the movable rod 6 to move, the movable rod 6 drives the adjusting rod 5 to move, and the adjusting rod 5 drives the pin 9 away from the test frame 10. Then, move the test frame 10 upward to complete the disassembly. Insert the replaced test frame 10 into the workbench 1, and then release the connecting seat 7. At this time, the second spring 8 pushes the connecting seat 7 to move, the connecting seat 7 drives the movable rod 6 to move, the movable rod 6 drives the adjusting rod 5 to move, and at the same time, the first spring 3 pulls the connecting frame 4 to move. The connecting frame 4 also drives the adjusting rod 5 to move, which in turn drives the pin 9 to insert into the replaced test frame 10, making the test frame 10 stable.
[0027] Moving the rectangular plate 16 upwards raises the sleeve 20, allowing the screw 21 to be removed and the sleeve 20 to be replaced. After replacement, the torque and pressure values are set via the external PLC controller. The bolt to be tested is then connected to the test frame 10. The rectangular plate 16 is then released, causing it to descend due to the thrust of the elastic telescopic rod 15, allowing the sleeve 20 to engage with the bolt. The motor 17 is then started, driving the torque sensor 18 to rotate, which in turn causes the sleeve 20 to rotate. The sleeve 20 then rotates the bolt, which descends during rotation, causing the connecting plate 13 to descend as well. The connecting plate 13 causes the third spring 12 to deform, resulting in a change in pressure detected by the pressure sensor 22. Once the torque value detected by the torque sensor 18 matches the set value, the motor 17 stops. The preload test is then completed by observing whether the pressure value detected by the pressure sensor 22 matches the set value.
[0028] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.
[0029] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.
[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.
Claims
1. A bolt pre-tightening force connection tightness testing device, comprising a workbench (1), characterized in that: The top of the workbench (1) is fixedly connected with a fixed frame (2), the two sides of the fixed frame (2) are fixedly connected with a first spring (3), one side of the first spring (3) is fixedly connected with a connecting frame (4), one side of the connecting frame (4) is fixedly connected with an adjusting rod (5), one side of the adjusting rod (5) is movably connected with a movable rod (6), one side of the movable rod (6) is movably connected with a connecting seat (7), the bottom of the connecting seat (7) is fixedly connected with a second spring (8), the bottom of the second spring (8) is fixedly connected with the fixed frame (2), the inner side of the adjusting rod (5) is fixedly connected with a latch (9), the surface of the latch (9) is inserted with a test frame (10), and the bottom of the test frame (10) is inserted with the workbench (1).
2. The bolt pre-tightening force connection tightness testing device according to claim 1, characterized in that: The top of the workbench (1) is fixedly connected with a pressure sensor (22), the top of the pressure sensor (22) is fixedly connected with a disc (11), the top of the disc (11) is fixedly connected with a third spring (12), the top of the third spring (12) is fixedly connected with a connecting plate (13), the outer side of the top of the workbench (1) is fixedly connected with a support (14), the top of the support (14) is fixedly connected with an elastic telescopic rod (15), the bottom of the elastic telescopic rod (15) is fixedly connected with a rectangular plate (16), the top of the rectangular plate (16) is fixedly connected with a motor (17), the output end of the motor (17) is fixedly connected with a torque sensor (18), the bottom of the torque sensor (18) is fixedly connected with a fixed seat (19), the bottom of the fixed seat (19) is inserted with a sleeve (20), and the inner cavities of the sleeve (20) and the fixed seat (19) are threadedly connected with screws (21).
3. The bolt pre-tightening force connection tightness testing device according to claim 1, characterized in that: The two sides of the fixed frame (2) are provided with a rectangular groove, and the inner cavity of the rectangular groove is slidably connected with the connecting frame (4).
4. The bolt pre-tightening force connection tightness testing device according to claim 1, characterized in that: The inner cavity of the connecting seat (7) is slidably connected with a sliding rod, and the bottom of the sliding rod is fixedly connected with the fixed frame (2).
5. The bolt pre-tightening force connection tightness testing device according to claim 1, characterized in that: The inner cavity of the adjusting rod (5) is slidably connected with a cross rod, and one side of the cross rod is fixedly connected with the fixed frame (2).
6. The bolt pre-tightening force connection tightness testing device according to claim 2, characterized in that: The outer side of the bottom of the connecting plate (13) is fixedly connected with a balance frame, and the surface of the balance frame is slidably connected with the workbench (1).