Heavy hammer grabbing device for testing machine

Abstract

The utility model belongs to the technical field of impact test equipment, and particularly relates to a heavy hammer grabbing device for a testing machine, which comprises a heavy hammer body, clamping jaws, a support, a lever and an electromagnet, the heavy hammer body is provided with a receding groove, the two sides of the receding groove are symmetrically provided with a plurality of groups of clamping jaws, and the clamping jaws are rotatably connected with the support through rotating shafts. The clamping jaw is fixedly connected with a stop block part and a jaw part, the jaw part is matched with the receding groove, the lever abuts against the clamping jaw, one end of the electromagnet is fixedly connected with the support, and the other end of the electromagnet is magnetically connected with the lever. The impact test device has the advantages that a mechanical structure is additionally arranged, automatic grabbing, clamping and releasing of the heavy punch are achieved, and the accuracy of impact test results is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of impact test equipment, in particular to a heavy hammer grabbing device for a testing machine. Background Art

[0002] Impact testing machines are used to measure the impact resistance of metal materials under dynamic loads in order to determine the properties of materials under dynamic loads. Common drop-weight impact testing machines lift the weight to a certain height, then release it to let it fall freely to impact the sample material placed on the test bench. The computer measures and analyzes the force, energy, deformation and other parameters generated during the impact to evaluate the material's impact resistance. After the existing impact testing machine equipment is powered on, the weight is directly adsorbed under the electromagnet by magnetic attraction, causing a certain impact and wear on the electromagnet. Over time, it affects the surface accuracy of the electromagnet, thereby reducing the accuracy of the impact test results. Utility Model Content

[0003] The utility model aims at solving the above problems and specifically designs a weight grabbing device for a testing machine, which adds a mechanical structure to realize automatic grabbing, clamping and releasing of the weight, thereby improving the accuracy of the impact test result.

[0004] To achieve the above-mentioned purpose, the utility model provides a heavy hammer grasping device for a testing machine, including a heavy hammer body, a clamping jaw, a bracket, a lever and an electromagnet, the heavy hammer body is provided with a clearance groove, a plurality of groups of clamping jaws are symmetrically arranged on both sides of the clearance groove, the clamping jaw is rotatably connected to the bracket through a rotating shaft, and the clamping jaw is fixedly connected with a block portion and a claw portion, the claw portion matches the clearance groove, the lever abuts against the clamping jaw, one end of the electromagnet is fixedly connected to the bracket, and the other end is magnetically connected to the lever.

[0005] Preferably, the rotating shaft is provided with a small hole, and a cotter pin is inserted into the small hole.

[0006] By adopting the above technical scheme, the weight body is used to apply impact load to the sample, the bracket is used to support and fix the clamping jaws and the electromagnet, the clamping jaws cooperate with the clearance groove to clamp the weight body, and the electromagnet is used to realize the movable connection between the lever and the clamping jaws; an additional mechanical structure is provided to realize automatic grasping and release of the weight body; the cotter pin is used to fix the rotating shaft and the bracket to ensure the stability of the movement state of the two, prevent axial deviation, and increase the accuracy of the impact test of the weight body on the sample.

[0007] Furthermore, the lever is fixedly connected with a clamping block matching the clamping jaw, and the clamping block is clamped with the clamping jaw.

[0008] Preferably, the clamping jaws are provided with two groups, each of which is threadedly connected with a pin shaft, and a spring is elastically connected between the pin shafts.

[0009] Preferably, the spring is a torsion spring, the pin shaft is provided with an external thread, and both ends of the torsion spring are respectively wound around and fixed to the external thread of the pin shaft.

[0010] Using the above technical solution, the block is used to fill the gap between the two jaws, limit the rotation of the jaws, fix the clamping state of the jaws, and ensure that the jaws clamp the weight body; the pin is used to fix and support the spring, and the external thread design is used to increase the resistance and friction of the spring and increase the structural stability; the ends of the torsion spring are fixed to the pins on both sides to generate torque or rotational force, which can store or release angular energy. The two form a reset structure, which is used to pull the two jaws back to their initial positions.

[0011] Furthermore, the bracket is provided with a through hole, and the bracket is slidably connected to the equipment base through a guide light rod.

[0012] By adopting the above technical solution, the guide light rod is used to limit and guide the moving path of the bracket, so as to meet the impact positioning requirements of the heavy hammer body and improve the accuracy of the impact test results.

[0013] In summary, the utility model has the following advantages and beneficial technical effects:

[0014] 1. The utility model utilizes a clamping jaw, a lever and an electromagnet, and adds a mechanical structure to realize automatic grasping and releasing of a weight body; the weight body is used to apply an impact load to the specimen, the bracket is used to support and fix the clamping jaw and the electromagnet, the clamping jaw cooperates with the clearance groove to clamp the weight body, and the electromagnet is used to realize the movable connection between the lever and the clamping jaw.

[0015] 2. The split pin is used to fix the shaft and the bracket to prevent axial deviation and ensure that the weight body can accurately impact the specimen during the test.

[0016] 3. The clamping block is used to fill the gap between the two jaws, limit the rotation of the jaws, and fix the clamping state of the jaws on the weight body; the design of the external thread on the pin shaft increases the resistance and friction to the spring and enhances the structural stability; the ends of the torsion spring are fixed to the pin shafts on both sides, and the two form a reset structure to generate torque or rotational force, and pull the two jaws back to their initial positions by releasing angular energy.

[0017] 4. The guide light rod is used to limit and guide the moving path of the bracket to meet the impact positioning requirements of the heavy hammer body and improve the accuracy of the impact test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a structural schematic diagram of the utility model in the main viewing direction;

[0020] Figure 2 is a schematic structural view of the present utility model in the top-down direction;

[0021] Figure 3 is along Figure 1 the sectional view taken along A-A in

[0022] Figure 4 is along Figure 1 the partial sectional view taken along B-B in

[0023] Figure 5 is along Figure 1 the partial top-down view taken at C in

[0024] The reference numerals in the drawings are:

[0025] 1. Hammer body; 11. Relief groove; 2. Claw; 21. Block part; 22. Claw part; 23. Rotating shaft; 24. Split pin; 3. Bracket; 4. Lever; 41. Block; 5. Electromagnet; 6. Pin shaft; 7. Torsion spring; 8. Guide optical rod. Detailed implementation mode

[0026] The following further elaborates on the present utility model in conjunction with the attached Figures 1 - 5 drawings:

[0027] As Figure 1 shown, this embodiment discloses a heavy hammer grasping device for a testing machine, which includes a hammer body 1, a claw 2, a bracket 3, a lever 4 and an electromagnet 5. A relief groove 11 is provided on the center line of the hammer body 1. Claws 2 are symmetrically arranged on both sides of the relief groove 11. The claws 2 are rotatably connected to the bracket 3 through a rotating shaft 23. A single claw 2 is a U-shaped integrally formed structure, including an upper block part 21 and a claw part 22 matching the relief groove 11. The clamping ends of the claw parts 22 all face the opening direction of the relief groove 11. One end of the electromagnet 5 is fixedly connected to the bracket 3 through a fastener, and the other end is magnetically connected to the lever 4. The lever 4 is rotatably connected to the bracket 3.

[0028] As Figures 2 - 5 shown, a small hole is provided in the part of the rotating shaft 23 located outside the bracket 3, and a split pin 24 is inserted into the small hole; the lever 4 is fixedly connected with a block 41 matching the claw 2. The lever 4 and the block 41 are integrally formed structures. The block 41 is clamped in the gap formed by the symmetric claws 2; there are two groups of claws 2. Pin shafts 6 are respectively threadedly connected to both sides of the claws 2. A spring is elastically connected between the pin shafts 6 on the same side of the two groups of claws 2; the spring is a torsion spring 7. The pin shafts 6 are tapped with external threads, and both ends of the torsion spring 7 are respectively wound and fixed on the external threads of the pin shafts 6; through holes are provided on both sides of the bracket 3, and guide optical rods 8 are arranged in the through holes. The guide optical rods 8 are fixedly connected to the equipment base, and the bracket 3 is slidably connected to the guide optical rods 8.

[0029] The working principle of a heavy hammer grasping device for a testing machine of the present utility model is as follows:

[0030] 1. This device includes a heavy hammer body 1, clamping jaws 2, a bracket 3, a lever 4, and an electromagnet 5. A relief groove 11 is provided on the center line of the heavy hammer body 1. The clamping jaws 2 are symmetrically arranged on both sides of the relief groove 11. The clamping jaws 2 are rotationally connected to the bracket 3 through a rotating shaft 23. A single clamping jaw 2 is a U-shaped integrally formed structure, including a blocking portion 21 above and a claw portion 22 matching the relief groove 11. The clamping ends of the claw portions 22 all face the opening direction of the relief groove 11. One end of the electromagnet 5 is fixedly connected to the bracket 3 through a fastener, and the other end is magnetically connected to the lever 4. The lever 4 is rotationally connected to the bracket 3; when the heavy hammer body 1 is not being grasped, the clamping ends of the clamping jaws 2 are in an open state. At this time, the claw portions 22 are far away from each other. When the bracket 3 is pulled down by the equipment, the clamping jaws 2 move synchronously with the bracket 3 until they contact the heavy hammer body 1 below. The heavy hammer body 1 presses against the blocking portion 21 above the clamping jaws 2. Under the continuous pressure exerted by the heavy hammer body 1, the clamping jaws 2 rotate around the rotating shaft 23. At the same time, the lower claw portions 22 rotate into the relief groove 11 to achieve automatic grasping of the heavy hammer body 1.

[0031] 2. A small hole is provided in the part of the rotating shaft 23 located outside the bracket 3, and a split pin 24 is inserted into the small hole; while satisfying the axial rotation of the rotating shaft 23, the split pin 24 restricts the horizontal movement of the rotating shaft 23, ensuring the stability of the assembly structure of the rotating shaft 23 and the bracket 3, and realizing the limit of the clamping jaws 2.

[0032] 3. The lever 4 is fixedly connected with a latch 41 matching the clamping jaws 2. The lever 4 and the latch 41 are integrally formed structures. The latch 41 is clamped in the gap formed by the symmetric clamping jaws 2; when the electromagnet 5 is energized to generate magnetic attraction, one end of the lever 4 is adsorbed, and at this time the other end drives the latch 41 to descend, and the latch 41 clamps the gap above the clamping jaws 2 to achieve clamping of the heavy hammer body 1.

[0033] 4. There are two groups of clamping jaws 2. Pin shafts 6 are respectively threadedly connected to both sides of the clamping jaws 2. A spring is elastically connected between the pin shafts 6 on the same side of the two groups of clamping jaws 2; when it is necessary to release the heavy hammer body 1 during the test, the adsorption of the electromagnet 5 on the lever 4 is cancelled, and this end descends. The other end of the lever 4 drives the latch 41 to rise. Subsequently, the spring between the pin shafts 6 rebounds and compresses, driving the upper parts of the two clamping jaws 2 to approach, and the lower claw portions 22 gradually move away. And due to the self-weight of the heavy hammer body 1, the release of the heavy hammer body 1 is realized.

[0034] 5. The spring is a torsion spring 7. The pin shaft 6 is tapped with external threads, and the two ends of the torsion spring 7 are respectively wound and fixed at the external threads of the pin shaft 6. When the heavy hammer body 1 is not clamped, the torsion spring 7 is in a natural and stress-free state. During the clamping process, the clamping jaw 2 rotates around the center of the rotating shaft 23. At this time, the torsion spring 7 is stretched and stores elastic potential energy. When the block 41 is withdrawn from the gap of the clamping jaw 2, the compressive stress on the torsion spring 7 disappears. At this time, the torsion spring 7 releases the elastic potential energy and pulls the clamping jaw 2 back to the initial state, thereby realizing the release of the claw part 22 on the heavy hammer body 1.

[0035] 6. Through holes are provided on both sides of the bracket 3, and guide optical rods 8 are arranged in the through holes. The guide optical rods 8 are fixedly connected to the equipment base, and the bracket 3 is slidably connected to the guide optical rods 8. The bracket 3 is driven by the equipment to climb or fall along the guide optical rods 8, and the heavy hammer body 1 is synchronously guided to achieve accurate impact positioning of the specimen.

[0036] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A heavy hammer grabbing device for a testing machine, characterized in that: It includes a heavy hammer body, a clamping jaw, a bracket, a lever and an electromagnet. The heavy hammer body is provided with a clearance groove, and multiple groups of clamping jaws are symmetrically arranged on both sides of the clearance groove. The clamping jaw is rotatably connected to the bracket through a rotating shaft, and the clamping jaw is fixedly connected with a block part and a claw part, and the claw part matches the clearance groove. The lever abuts against the clamping jaw, and one end of the electromagnet is fixedly connected to the bracket, and the other end is magnetically connected to the lever.

2. A heavy hammer grabbing device for a testing machine according to claim 1, characterized in that: The rotating shaft is provided with a small hole, and a cotter pin is inserted into the small hole.

3. A weight grabbing device for a testing machine according to claim 2, characterized in that: The lever is fixedly connected with a clamping block matching the clamping claw, and the clamping block is clamped with the clamping claw.

4. A weight grabbing device for a testing machine according to claim 3, characterized in that: The clamping jaws are provided with two groups, each of which is threadedly connected with a pin shaft, and a spring is elastically connected between the pin shafts.

5. A weight grabbing device for a testing machine according to claim 4, characterized in that: The spring is a torsion spring, the pin shaft is provided with an external thread, and the two ends of the torsion spring are respectively wound around and fixed on the external thread of the pin shaft.

6. A weight grabbing device for a testing machine according to claim 5, characterized in that: The bracket is provided with a through hole, and the bracket is slidably connected to the equipment base through a guide light rod.

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