Concentric adjusting clamp body for dynamic and static universal testing machine
By designing a concentric adjustment fixture on a dynamic and static universal testing machine, and using the principle of adjusting screws and ball joints to fine-tune the concentricity, the problem of difficult adjustment of fixture concentricity was solved, thereby improving the accuracy and reliability of the test.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JINAN POPWIL INSTR CO LTD
- Filing Date
- 2025-04-29
- Publication Date
- 2026-04-21
AI Technical Summary
The concentricity of the fixtures in traditional dynamic and static universal testing machines is difficult to adjust, resulting in inaccurate test data.
Design a concentric adjustment clamp body for a dynamic and static universal testing machine, add a concentric adjustment mechanism, and use the adjustment screw and ball joint principle to fine adjust the concentricity. By adjusting the screw in the upper and lower layers of the base, the tie rod is forced to deform slightly to achieve the concentricity of the upper and lower clamp bodies.
The accuracy of the experiment was improved by adjusting the concentricity from multiple angles to ensure the consistency of the concentricity of the clamping body, thereby enhancing the reliability of the test data.
Smart Images
Figure CN224152177U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of materials mechanics testing equipment, specifically to a concentric adjustment clamp for a dynamic and static universal testing machine. Background Technology
[0002] The universal testing machine is a multifunctional testing device that integrates dynamic fatigue testing and static mechanical testing. It is widely used in material mechanical property analysis and structural durability assessment. Traditional testing machines rely on machining precision to ensure the concentricity of the upper and lower clamps, which leads to machining and assembly errors. These errors make it difficult to adjust concentricity during dynamic testing, thus affecting the accuracy of the test data. Utility Model Content
[0003] This utility model addresses the problems mentioned above by specifically designing a concentric adjustment fixture for a dynamic and static universal testing machine. It adds a concentric adjustment mechanism to adjust the concentricity of the fixture, thereby improving the accuracy of the test.
[0004] To achieve the above objectives, this utility model provides a concentric adjustment clamping body for a dynamic and static universal testing machine, including a crossbeam, a tie rod, a load sensor, and an upper clamping body. The feature is that it further includes a concentric adjustment mechanism; the upper end of the tie rod is engaged with the crossbeam, and the lower end is threadedly connected to the load sensor; the middle portion of the tie rod sequentially passes through the central hole of the crossbeam and the concentric adjustment mechanism; and the upper clamping body is connected to the load sensor via a lead screw.
[0005] Furthermore, the concentric adjustment mechanism includes a base, an upper concentric adjustment block, a lower concentric adjustment block, and an adjustment screw. The base is disposed between the crossbeam and the load sensor. The upper and lower concentric adjustment blocks are respectively disposed at both ends of the base, and the upper concentric adjustment block is in spherical contact with the base. The base has multiple sets of threaded holes, and the adjustment screw is threaded to the base and abuts against the upper and lower concentric adjustment blocks respectively.
[0006] Preferably, the adjusting screws are arranged in a circumferential array on the sidewall of the base.
[0007] Furthermore, a tension ring is pressed onto the upper end of the crossbeam, and the upper end of the pull rod is threaded to the center hole of the tension ring and is engaged with the crossbeam through the tension ring.
[0008] Furthermore, the tension ring is equipped with a washer and a fastening screw. The washer is disposed between the tension ring and the crossbeam, and the fastening screw is threaded to the tension ring and abuts against the washer from below.
[0009] Furthermore, a locking ring is installed between the upper clamp and the load sensor.
[0010] Furthermore, it also includes a clamping machine base, a lifting cylinder, and a lower clamping body. The two ends of the lifting cylinder are respectively connected to the clamping machine base and the crossbeam. The lower clamping body is movably connected to the clamping machine base through an actuator piston rod, and the jaws of the lower clamping body and the upper clamping body are arranged opposite to each other.
[0011] Furthermore, a guide rod is also installed between the fixture base and the crossbeam.
[0012] In summary, this utility model has the following advantages and beneficial technical effects:
[0013] This invention features a concentric adjustment mechanism that utilizes adjusting screws and a ball joint principle to fine-tune concentricity. The adjusting screws on the upper and lower layers of the base work together to force slight deformation of the tie rod, thereby achieving the purpose of adjusting the concentricity of the upper and lower clamping bodies and improving the accuracy of the test. The adjusting screws are arranged in a circumferential array about the base, allowing for multi-directional adjustment of concentricity. Attached Figure Description
[0014] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0015] Figure 1 This is a three-dimensional schematic diagram of the present invention;
[0016] Figure 2 This is a schematic diagram of the concentric adjustment mechanism in this utility model;
[0017] Figure 3 This is a front view schematic diagram of the present invention;
[0018] Figure 4 This is a side view of the present invention;
[0019] Figure 5 This is a top view of the present invention.
[0020] The reference numerals in the attached figures are:
[0021] 1. Crossbeam; 2. Tie rod; 3. Load sensor; 4. Upper clamp body;
[0022] 5. Concentric adjustment mechanism; 51. Base; 52. Upper concentric adjustment block; 53. Lower concentric adjustment block; 54. Adjusting screw;
[0023] 6. Lead screw; 7. Tension ring; 8. Washer; 9. Fastening screw; 10. Locking ring; 11. Fixture base; 12. Lifting cylinder; 13. Lower clamp body; 14. Actuator piston rod; 15. Guide rod. Detailed Implementation
[0024] The following is in conjunction with the appendix Figures 1-5The present invention will be described in further detail as follows:
[0025] like Figures 1-3 As shown, this embodiment discloses a concentric adjustment fixture for a dynamic and static universal testing machine, including a crossbeam 1, a pull rod 2, a load sensor 3, an upper fixture 4, and a concentric adjustment mechanism 5. The upper end of the pull rod 2 is engaged with the crossbeam 1, and the lower end is threaded to the internal thread hole of the load sensor 3. The middle part of the pull rod 2 passes through the center hole of the crossbeam 1 and the concentric adjustment mechanism 5 in sequence. The upper fixture 4 is installed below the load sensor 3 through a lead screw 6.
[0026] like Figure 2 As shown, the concentric adjustment mechanism 5 includes a base 51, an upper concentric adjustment block 52, a lower concentric adjustment block 53, and adjustment screws 54. The base 51 is disposed between the crossbeam 1 and the load sensor 3. The upper concentric adjustment block 52 and the lower concentric adjustment block 53 are respectively disposed at both ends of the base 51, and the upper concentric adjustment block 52 is in spherical contact with the base 51. The base 51 has multiple sets of threaded holes perpendicular to the axial direction. The adjustment screws 54 are threaded to the base 51 and respectively abut against the side walls of the upper concentric adjustment block 52 and the lower concentric adjustment block 53. The adjustment screws 54 are arranged in a circumferential array around the base 51.
[0027] like Figure 3 and Figure 5 As shown, a tension ring 7 is pressed onto the upper end of the crossbeam 1, and the upper end of the pull rod 2 is threaded to the central threaded hole of the tension ring 7; the tension ring 7 is equipped with a washer 8 and a fastening screw 9, the washer 8 is placed between the tension ring 7 and the crossbeam 1, and in this embodiment there are 8 sets of fastening screws 9, arranged in a circumferential array and threaded to the tension ring 7, and the lower part of the fastening screw 9 abuts against the washer 8; the upper clamp body 4 and the load sensor 3 are locked together by a locking ring 10.
[0028] like Figures 3-4 As shown, the clamping body also includes a clamping base 11, a lifting cylinder 12, and a lower clamping body 13. The cylinder body of the lifting cylinder 12 is connected to the clamping base 11, and the piston part at the other end is connected to the crossbeam 1 via a floating joint. The lifting cylinder 12 is used to adjust the lifting height of the crossbeam 1. The lower clamping body 13 is threadedly connected to the actuator piston rod, which is fixedly connected to the clamping base 11. The upper clamping body 4 and the jaws of the lower clamping body 13 are arranged opposite to each other. Guide rods 15 are symmetrically installed between the clamping base 11 and the crossbeam 1.
[0029] The specific working principle of the concentric adjusting clamp for a dynamic and static universal testing machine of this utility model is as follows:
[0030] When the testing machine is used for testing, the sample is placed between the upper clamping body 4 and the lower clamping body 13. The clamping body is hydraulically driven for clamping. First, tighten the fastening screw 9 on the tension ring 7 to secure the crossbeam 1 to the upper clamping body 4. When the upper clamping body 4 and the lower clamping body 13 are not concentric, tighten the adjusting screw 54 on the upper layer of the base 51. Because the adjusting screw 54 is threaded to the base 51, when the end of the adjusting screw 54 touches the upper concentric adjusting block 52, it will generate a reaction force on the base 51. Also, because the upper end of the base 51 and the lower end of the upper concentric adjusting block 52 are in spherical contact, the upper concentric adjusting block 52 will generate a reaction force on the base 51. The upper end of block 52 is provided with a cylindrical boss, which is inserted into the stop at the lower end of the crossbeam 1 to ensure that the upper concentric adjustment block 52 will not move when subjected to lateral force, and the reaction force will force the base 51 to tilt. Then, tighten the fastening screw 9 in the lower layer of the base 51 that is opposite to the upper layer. Since the pull rod 2 is inserted into the inner hole of the lower concentric adjustment block 53, the lower concentric adjustment block 53 contacts the pull rod 2 and exerts a force on the pull rod 2, forcing the pull rod 2 to deform slightly, thereby achieving the effect of adjusting the clamp to be concentric.
[0031] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be included within the scope of protection of this utility model.
Claims
1. A concentric adjusting clamp body for a universal testing machine, comprising a crosshead, a pull rod, a load cell and an upper clamp body, characterized in that: It also includes a concentric adjustment mechanism, wherein the upper end of the pull rod is engaged with the crossbeam and the lower end is threadedly connected to the load sensor, the middle part of the pull rod sequentially passes through the center hole of the crossbeam and the concentric adjustment mechanism, and the upper clamp is connected to the load sensor through a lead screw.
2. The concentric adjusting clamp for a universal testing machine according to claim 1, wherein: The concentric adjustment mechanism includes a base, an upper concentric adjustment block, a lower concentric adjustment block, and an adjustment screw. The base is disposed between the crossbeam and the load sensor. The upper and lower concentric adjustment blocks are respectively disposed at both ends of the base, and the upper concentric adjustment block is in spherical contact with the base. The base has multiple sets of threaded holes. The adjustment screw is threaded to the base and abuts against the upper and lower concentric adjustment blocks respectively.
3. The concentric adjusting clamp for a universal testing machine according to claim 2, wherein: The adjusting screws are arranged in a circumferential array on the side wall of the base.
4. The concentric adjusting clamp for a universal testing machine according to claim 1, wherein: A tension ring is pressed onto the upper end of the crossbeam, and the upper end of the pull rod is threaded to the center hole of the tension ring and is engaged with the crossbeam through the tension ring.
5. A concentric adjustment clamp body for a dynamic and static universal testing machine according to claim 4, characterized in that: The tension ring is equipped with a washer and a fastening screw. The washer is located between the tension ring and the crossbeam, and the fastening screw is threaded to the tension ring and abuts against the washer from below.
6. The concentric adjusting clamp for a universal testing machine according to claim 1, wherein: A locking ring is installed between the upper clamp and the load sensor.
7. The concentric adjusting clamp for a universal testing machine according to claim 1, wherein: It also includes a clamping machine base, a lifting cylinder and a lower clamping body. The two ends of the lifting cylinder are respectively connected to the clamping machine base and the crossbeam. The lower clamping body is movably connected to the clamping machine base through an actuator piston rod, and the jaws of the lower clamping body and the upper clamping body are arranged opposite to each other.
8. The concentric adjusting clamp according to claim 7, characterized in that: A guide rod is also installed between the fixture base and the crossbeam.