A sample centering and positioning fixture for a pendulum impact tester

Abstract

This utility model relates to the field of pendulum impact centering and positioning technology, and proposes a sample centering and positioning fixture for a pendulum impact machine. The design includes a main component, a centering component, and an auxiliary vibration-damping component. The main component includes a tower base and a support base. The centering component includes a threaded rod driven by a first forward and reverse motor, a slide block threaded to the threaded rod and capable of lateral sliding, a cylinder and a top plate for clamping the sample, and a guiding and positioning mechanism composed of a limit rod, balls, and scales. The auxiliary vibration-damping component includes a pair of elliptical blocks driven by a second forward and reverse motor and driven by a worm gear transmission pair, with rubber pads on the outer sides of the elliptical blocks. This utility model achieves automated and precise sample centering through motor drive. Utilizing the self-locking characteristics of the worm gear and the method of the elliptical blocks pressing against the rail grooves on both sides of the support base, it achieves double locking and vibration damping of the slide block, effectively solving the problems of low efficiency, poor accuracy, and easy sample displacement during impact by manual centering.

Description

Technical Field

[0001] This utility model relates to the field of pendulum impact centering and positioning technology, specifically to a sample centering and positioning fixture for a pendulum impact machine. Background Technology

[0002] The pendulum impact tester is a key piece of equipment for determining the impact resistance of materials, widely used in fields such as plastic films, metal foils, and composite materials. Its working principle is based on the law of energy conservation; it assesses the material's impact resistance by impacting the sample with a pendulum and measuring the energy consumption. The equipment is typically equipped with high-precision sensors, a PLC control system, and a pneumatic clamping device to ensure test accuracy and repeatability. During the test, precise alignment of the sample is crucial for ensuring accurate impact points and obtaining reliable experimental data. Poor sample alignment can lead to dispersed impact energy and shifted stress concentration points, resulting in biased test results and severely affecting the accurate evaluation of material properties.

[0003] A search revealed that Chinese utility model patent CN210923260U discloses an auxiliary centering fixture for a pendulum impact testing machine. The fixture includes a centering component and a connecting rod. The centering component comprises a centering block and a support rod. One end of the centering block is shaped to fit the notch of the specimen, and the other end is detachably connected to one end of the support rod. The other end of the support rod is fixedly connected to the connecting rod. The connecting rod is rotatably connected to a support, allowing the centering block to rotate to a position where it contacts the specimen. A control element is provided on the connecting rod to control the relative position between the connecting rod and the support. Adjusting the control element rotates the connecting rod, causing the support rod to rotate, bringing the centering block into contact with the notch of the specimen, thus centering the specimen. This design, through the centering component and connecting rod, improves the ease of specimen centering to a certain extent; the centering block, which fits the shape of the specimen, also reduces the impact of human factors on the accuracy of experimental data.

[0004] However, the aforementioned existing technologies still have significant shortcomings: First, the centering process relies entirely on manual operation, with the centering block contacting the sample by manually adjusting the control components. This results in large human errors, slow centering speed, and poor repeatability, affecting testing efficiency and accuracy. Second, the fixture lacks an effective vibration resistance and locking mechanism. Its sample positioning relies solely on the shape fit of the centering block. Under the massive vibration of a pendulum impact, the sample is prone to displacement or loosening, failing to guarantee positioning stability at the moment of impact, thus affecting the reliability of the test results. Therefore, there is an urgent need for a fixture that can achieve automated and precise centering and provide reliable locking protection during impact. Utility Model Content

[0005] This invention proposes a sample centering and positioning fixture for a pendulum impact machine, which solves the problems of existing technology where the centering process relies on manual operation, resulting in low accuracy and efficiency, as well as the lack of anti-vibration and locking mechanisms and insufficient stability.

[0006] The technical solution of this utility model is as follows: a sample centering and positioning fixture for a pendulum impact machine, including a main body assembly (1), the main body assembly (1) including a tower base (11) and a support base (12) fixedly connected to the top of the tower base (11). Centering component (2) disposed inside the support base (12); The centering assembly (2) includes a threaded rod (211) rotatably connected to the inside of the support (12). A slide (22) is threaded to the outside of the threaded rod (211) and can slide laterally with the rotation of the threaded rod (211). Auxiliary vibration damping components (3) are disposed on both sides of the slide (22) and are able to lock and position themselves after the slide (22) slides to the center position.

[0007] Preferably, the centering component (2) further includes: A first positive and negative motor (21) is fixedly installed on the outside of the support base (12); The output end of the first forward and reverse motor (21) is fixedly connected to the threaded rod (211).

[0008] Preferably, the main component (1) further includes: A limiting rod (123) is symmetrically fixedly connected to the inner side of the support base (12); The scale marks (122) are distributed on one side of the top of the support (12).

[0009] Preferably, the centering component (2) further includes: Symmetrical perforations (24) are formed at the bottom of the side of the slide (22); A ball bearing (241) is rotatably connected to the inside of the perforation (24) in a ring shape. The ball (241) is in contact with the limiting rod (123).

[0010] Preferably, the centering component (2) further includes: A groove (221) is formed on the top of the slide (22); A cylinder (23) is fixedly installed on one side of the groove (221); The top plate (231) is fixedly connected to the telescopic end of the cylinder (23).

[0011] Preferably, the auxiliary vibration damping component (3) includes: A support frame (31) is symmetrically fixedly connected to one side of the slide (22); A second positive and negative motor (32) is fixedly installed on the outside of one of the support frames (31).

[0012] Preferably, the auxiliary vibration damping component (3) further includes: The main shaft (33) is rotatably connected to the middle of the two sets of support frames (31); The main rotating shaft (33) is fixedly connected to the output end of the second forward and reverse motor (32); The worm (331) is fixedly connected to the outside of the main shaft (33).

[0013] Preferably, the auxiliary vibration damping component (3) further includes: Rotary shaft (34) is rotatably connected to the side of the slide (22); A worm gear (341) is fixedly connected to the outside of the secondary shaft (34); The worm wheel (341) is in contact with the worm (331) and is meshed and rotated.

[0014] Preferably, the auxiliary vibration damping component (3) further includes: Rotary connection to the coupling (35) inside the slide (22); An elliptical block (36) is symmetrically fixed to the outside of the coupling (35); Rubber pads (361) are distributed on the outside of the elliptical block (36).

[0015] Preferably, the auxiliary vibration damping component (3) further includes: The rail grooves (121) are symmetrically opened through both sides of the support base (12); The track groove (121) corresponds to the elliptical block (36) and the rubber pad (361).

[0016] The beneficial effects of this utility model are as follows: High-precision automatic centering is achieved by using an electric drive in conjunction with scale markings. This patented technology uses a first forward and reverse motor to drive a threaded rod, which moves the slide laterally and, in conjunction with the scale on the support base, performs precise positioning. This achieves an automated, high-precision, and repeatable centering process, significantly improving centering efficiency and accuracy.

[0017] Adding auxiliary vibration damping components and a self-locking structure enhances stability and impact resistance. This patent features auxiliary anti-vibration components on both sides of the slide block. Through worm gear transmission, the elliptical block and rubber pad are driven to press tightly against the rail groove. Utilizing its self-locking effect and the absorption of vibration by the buffer material, the slide block is double-locked and protected against vibration, effectively preventing sample displacement during impact and improving test stability. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the overall device of this utility model; Figure 2 This is a schematic diagram showing the disassembled main components and centering components of this utility model; Figure 3 for Figure 2 Enlarged view of region A; Figure 4 This is a schematic diagram of the auxiliary vibration damping component of this utility model; In the diagram: 1. Main component; 11. Tower base; 12. Support base; 121. Rail groove; 122. Scale mark; 123. Limiting rod; 2. Centering component; 21. First forward and reverse motor; 211. Threaded rod; 22. Slide; 221. Slot; 23. Cylinder; 231. Top plate; 24. Perforation; 241. Ball bearing; 3. Auxiliary vibration damping component; 31. Support frame; 32. Second forward and reverse motor; 33. Main shaft; 331. Worm gear; 34. Secondary shaft; 341. Worm wheel; 35. Coupling; 36. Elliptical block; 361. Rubber pad. Detailed Implementation

[0020] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0021] like Figures 1 to 4 As shown, the present invention provides a sample centering and positioning fixture for a pendulum impact machine, comprising a main body assembly (1), wherein the main body assembly (1) includes a tower base (11) and a support base (12) fixedly connected to the top of the tower base (11) by welding or bolts. The tower base (11) is used to provide stable support, and the support base (12) provides a structural basis for centering and locking.

[0022] The centering component (2) is disposed inside the support (12) to realize the lateral position adjustment and centering of the sample; The centering assembly (2) includes a threaded rod (211) rotatably connected to the inside of the support (12) via a bearing. A slide (22) is threaded to the outside of the threaded rod (211) and can slide laterally with the rotation of the threaded rod (211). The slide (22) is provided with a threaded hole that matches the threaded rod (211). The auxiliary anti-vibration components (3) are arranged on both sides of the slide (22) and can be locked and positioned after the slide (22) is slid to the center position, so as to achieve stable locking and anti-vibration after centering.

[0023] The centering assembly (2) further includes a first forward and reverse motor (21) fixedly installed on the outside of the support base (12) by bolts; the output end of the first forward and reverse motor (21) is fixedly connected to the threaded rod (211) through a coupling, and is used to provide the power for the forward and reverse rotation of the threaded rod (211) to realize the left and right movement of the slide (22).

[0024] The main component (1) also includes: a limiting rod (123) symmetrically fixedly connected to the inner side of the support base (12) to restrict the slide (22) to move only in the horizontal direction; and a scale (122) distributed on one side of the top of the support base (12) to assist in observing and accurately positioning the position of the slide (22).

[0025] The centering component (2) further includes: a perforation (24) symmetrically opened at the bottom of the slide (22); a ball bearing (241) rotatably connected to the inside of the perforation (24); the ball bearing (241) contacts the limiting rod (123) to reduce the frictional resistance when the slide (22) moves and improve the smoothness of movement.

[0026] The centering assembly (2) further includes: a groove (221) for placing the sample on the top of the slide (22); a cylinder (23) fixedly installed on one side of the groove (221) by bolts; and a top plate (231) fixedly connected to the telescopic end of the cylinder (23), which is used to push the top plate (231) to press or release the sample by telescopic movement of the cylinder (23), thereby achieving rapid clamping and release of the sample.

[0027] The auxiliary vibration damping component (3) includes: a support frame (31) symmetrically welded to one side of the slide (22); and a second positive and negative motor (32) fixedly installed on the outside of one set of the support frames (31) by bolts.

[0028] The auxiliary vibration damping component (3) further includes: a main shaft (33) rotatably connected to the middle of the two sets of support frames (31) via bearings; the main shaft (33) is fixedly connected to the output end of the second positive and negative motor (32) via a coupling; and a worm gear (331) fixedly connected to the outside of the main shaft (33).

[0029] The auxiliary vibration damping component (3) further includes: a secondary rotating shaft (34) rotatably connected to the side of the slide (22) via a bearing; and a worm wheel (341) fixedly connected to the outside of the secondary rotating shaft (34); the worm wheel (341) is in contact with the worm (331) and is meshed and rotatably connected to form a transmission pair with a self-locking function.

[0030] The auxiliary vibration damping component (3) further includes: a coupling (35) rotatably connected to the inner side of the slide (22) via a bearing, the coupling (35) and the auxiliary shaft (34) rotating synchronously via a key connection; an elliptical block (36) symmetrically fixedly connected to the outer side of the coupling (35); and rubber pads (361) distributed on the outer side of the elliptical block (36) by adhesive bonding, for providing cushioning and friction enhancement.

[0031] The auxiliary vibration damping component (3) further includes: a rail groove (121) symmetrically opened through both sides of the support base (12); the rail groove (121) corresponds to the position of the elliptical block (36) and the rubber pad (361), providing a channel and support for the tightening of the elliptical block (36).

[0032] The working principle and usage process of this utility model are as follows: First, place the impact sample in the groove (221) at the top of the slide (22), start the cylinder (23), and its telescopic end pushes the top plate (231) to move towards the sample, cooperating with the groove (221) to clamp and fix the sample.

[0033] When the sample needs to be aligned, the first forward and reverse motor (21) is started, driving the threaded rod (211) to rotate, which in turn causes the threaded slide (22) connected to it to slide laterally along the limiting rod (123). The operator precisely controls the movement distance of the slide (22) by observing the scale (122) on the support (12) until the center of the sample is aligned with the impact center of the pendulum. The self-locking characteristic of the threaded drive itself can effectively prevent the slide (22) from shifting after the motor stops.

[0034] After centering, the second forward and reverse motor (32) of the auxiliary vibration damping component (3) is activated to drive the main shaft (33) and worm gear (331) to rotate. The worm gear (331) drives the meshing worm wheel (341) to rotate, which in turn drives the coupling (35) and elliptical block (36) to rotate through the secondary shaft (34). During the rotation of the elliptical block (36), the rubber pad (361) on its outer side gradually presses against the inner wall of the rail groove (121) on both sides of the support seat (12). The self-locking effect of the worm gear drive ensures that the locked state can be reliably maintained, effectively resisting the vibration and lateral force generated during the impact process, preventing the sample position from changing, thereby ensuring the accuracy and reliability of the test results.

[0035] After the test is completed, control the second forward and reverse motor (32) to reverse so that the elliptical block (36) is retracted and the lock is released. Alternatively, control the first forward and reverse motor (21) to reset the slide (22) and control the cylinder (23) to release the sample, thus completing one test cycle.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A sample centering and positioning fixture for a pendulum impact tester, comprising a main body assembly (1), characterized in that: The main component (1) includes a tower base (11) and a support base (12) fixedly connected to the top of the tower base (11). Centering component (2) disposed inside the support base (12); The centering assembly (2) includes a threaded rod (211) rotatably connected to the inside of the support (12). A slide (22) is threaded to the outside of the threaded rod (211) and can slide laterally with the rotation of the threaded rod (211). Auxiliary vibration damping components (3) are disposed on both sides of the slide (22) and are able to lock and position themselves after the slide (22) slides to the center position.

2. The sample centering and positioning fixture for a pendulum impact tester according to claim 1, characterized in that, The centering component (2) also includes: A first positive and negative motor (21) is fixedly installed on the outside of the support base (12); The output end of the first forward and reverse motor (21) is fixedly connected to the threaded rod (211).

3. The sample centering and positioning fixture for a pendulum impact tester according to claim 1, characterized in that, The main component (1) also includes: A limiting rod (123) is symmetrically fixedly connected to the inner side of the support base (12); The scale marks (122) are distributed on one side of the top of the support (12).

4. The sample centering and positioning fixture for a pendulum impact tester according to claim 3, characterized in that, The centering component (2) also includes: Symmetrical perforations (24) are formed at the bottom of the side of the slide (22); A ball bearing (241) is rotatably connected to the inside of the perforation (24) in a ring shape. The ball (241) is in contact with the limiting rod (123).

5. The sample centering and positioning fixture for a pendulum impact tester according to claim 1, characterized in that, The centering component (2) also includes: A groove (221) is formed on the top of the slide (22); A cylinder (23) is fixedly installed on one side of the groove (221); The top plate (231) is fixedly connected to the telescopic end of the cylinder (23).

6. The sample centering and positioning fixture for a pendulum impact tester according to claim 1, characterized in that, The auxiliary vibration damping component (3) includes: A support frame (31) is symmetrically fixedly connected to one side of the slide (22); A second positive and negative motor (32) is fixedly installed on the outside of one of the support frames (31).

7. The sample centering and positioning fixture for a pendulum impact tester according to claim 6, characterized in that, The auxiliary vibration damping component (3) also includes: The main shaft (33) is rotatably connected to the middle of the two sets of support frames (31); The main rotating shaft (33) is fixedly connected to the output end of the second forward and reverse motor (32); The worm (331) is fixedly connected to the outside of the main shaft (33).

8. The sample centering and positioning fixture for a pendulum impact tester according to claim 7, characterized in that, The auxiliary vibration damping component (3) also includes: Rotary shaft (34) is rotatably connected to the side of the slide (22); A worm gear (341) is fixedly connected to the outside of the secondary shaft (34); The worm wheel (341) is in contact with the worm (331) and is meshed and rotated.

9. A sample centering and positioning fixture for a pendulum impact tester according to claim 8, characterized in that, The auxiliary vibration damping component (3) also includes: Rotary connection to the coupling (35) inside the slide (22); An elliptical block (36) is symmetrically fixed to the outside of the coupling (35); Rubber pads (361) are distributed on the outside of the elliptical block (36).

10. A sample centering and positioning fixture for a pendulum impact tester according to claim 1, characterized in that, The auxiliary vibration damping component (3) also includes: The rail grooves (121) are symmetrically opened through both sides of the support base (12); The track groove (121) corresponds to the elliptical block (36) and the rubber pad (361).

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