A clamping mechanism for a tensile testing machine

Abstract

The present application discloses a clamping mechanism for a tensile testing machine, which relates to the field of tensile testing machines and improves the problem that materials are easily separated from the clamp during tensile testing. The mechanism comprises a clamp shell and a bottom plate, wherein a clamping assembly is arranged on the inner side of the clamp shell, and a second rack is fixedly mounted on the outer side of the auxiliary clamp block, and a gear is meshed on the top of the second rack, and the gear is meshed on the inner side of the first rack. When the material is pulled by the present application, the clamp shell will move away from the bottom plate, and the gear will rotate along the first rack when moving away from the bottom plate. The rotation of the gear can drive the second rack to move inward, and the inward movement of the second rack can drive the auxiliary clamp block to move inward. The auxiliary clamp block moves inward and can squeeze and clamp the internal material, so that the pulling force during pulling can be converted into the clamping force of the auxiliary clamp block on the material, thereby achieving the goal of continuing to provide clamping force on the material during pulling, and greatly reducing the probability of the material being separated from the clamp plate.

Description

Technical Field

[0001] The utility model relates to the technical field of tension testing machines, in particular to a clamping mechanism of a tension testing machine. Background Art

[0002] The tensile testing machine is a mechanical force testing machine used to perform static load, stretching, compression, bending, shearing, peeling and other mechanical property tests on materials. It is suitable for various physical and mechanical property tests of plastic plates, pipes, special-shaped materials, plastic films, rubber, wires and cables, etc. It is an indispensable testing equipment for material development, physical property testing, teaching research, quality control, etc.

[0003] When clamping materials, the tensile testing machine generally clamps them through a rotatable screw and a clamping plate. The clamping plates are driven closer to each other by rotating the screws on both sides, and the materials are clamped by the clamping plates on both sides. This clamping force is fixed by the prestress of the screw and the friction between the clamping plate and the material.

[0004] When the testing machine is in use, since the machine continuously applies force to the material, the clamping force of the splint and the friction between the splint and the material are used to counteract the pulling force of the machine to ensure that the material does not separate from the splint. However, when pulled for a long time, the squeezing force of the splint on the material will not increase, while the pulling force will continue to increase, which may cause the material to separate from the fixture. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the above problems existing in the prior art, the utility model provides a clamping mechanism for a tensile testing machine.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the utility model is implemented through the following technical solutions: A clamping mechanism of a tensile testing machine, comprising a clamp shell and a bottom plate, a clamping assembly is arranged on the inner side of the clamp shell, and an auxiliary assembly is arranged on the top of the bottom plate and located on the outer side of the clamping assembly;

[0009] The clamping assembly includes two clamping plates, which are slidably connected to the inner side of the clamp shell, and the inner side of the clamping plates is provided with a friction groove. The auxiliary assembly includes a vertical rod, which is fixedly installed on the top of the base plate, and a first rack is fixedly installed on the top of the vertical rod. An internal groove is opened inside the clamping plate, and an auxiliary clamping block is inserted into the internal groove. A second rack is fixedly installed on the outer side of the auxiliary clamping block, and a gear is meshed on the top of the second rack, and the gear is meshed on the inner side of the first rack.

[0010] As a preferred solution of the clamping mechanism of the tensile testing machine of the utility model, a screw is rotatably connected inside the clamp shell, two moving blocks are screwed on the outside of the screw, a connecting groove is opened at the bottom of the clamp plate, and the moving block is fixed inside the corresponding connecting groove.

[0011] By adopting the above technical solution, the moving block and the clamping plate are driven to move by the rotation of the screw.

[0012] As a preferred solution of the clamping mechanism of the tensile testing machine of the utility model, the threads on both sides of the center of the screw have different rotation directions, and the two moving blocks are respectively screwed on the outer sides of the thread rotation directions of the two parts of the screw.

[0013] By adopting the above technical solution, the clamping plates on both sides can be synchronously moved in opposite directions by means of screw rods.

[0014] As a preferred solution of the clamping mechanism of the tensile testing machine of the utility model, the left and right sides of the clamp shell are rotatably connected with rotating rods, the outer end of the rotating rod is fixedly installed with a knob, and the inner end of the rotating rod movably passes through the side wall of the clamp shell and is fixedly connected to the screw.

[0015] By adopting the above technical solution, the knob and the rotating rod can conveniently rotate the screw rod from the outside.

[0016] As a preferred solution of the clamping mechanism of the tensile testing machine described in the utility model, a support plate is fixedly installed on the top of the clamp shell, a synchronization rod is rotatably connected to the inner side of the top of the support plate, gears are fixedly installed on both the front and rear ends of the synchronization rod, and a connecting plate is fixedly installed between the outer ends of the front and rear corresponding second racks.

[0017] By adopting the above technical solution, the support plate and the synchronization rod support and synchronize the gears.

[0018] As a preferred solution of the clamping mechanism of the tensile testing machine of the utility model, a telescopic rod is fixedly installed on the top of the base plate, the top of the telescopic rod is fixedly installed on the bottom of the clamp shell, a spring is wound around the outside of the telescopic rod, and the upper and lower sides of the spring are respectively fixedly installed on the top of the base plate and the bottom of the clamp shell.

[0019] By adopting the above technical solution, the position of movement between the connecting plate and the clamp shell is limited, and the force required for movement between the two is increased.

[0020] (III) Beneficial effects

[0021] The utility model provides a clamping mechanism for a tensile testing machine, which has the following beneficial effects:

[0022] 1. When pulling the material, the clamp shell will move away from the bottom plate, and the gear will rotate along the first rack when moving away. The rotation of the gear can drive the second rack to move inward, and the inward movement of the second rack can drive the auxiliary clamp to move inward. The auxiliary clamp moves inward and can squeeze and clamp the internal material, so that the pulling force during pulling can be converted into the clamping force of the auxiliary clamp on the material, so that the clamping force can continue to be provided to the material during pulling, which greatly reduces the probability of the material being separated from the clamp.

[0023] 2. The clamping plates move synchronously in the opposite direction to clamp the materials on both sides and cooperate with the friction grooves on the inside to clamp and fix the materials. After the materials are clamped and fixed, the clamping plates that move synchronously in the opposite direction can ensure that the clamping position of the materials is in the center of the left and right sides, thus achieving a convenient clamping effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0026] Figure 2 It is a three-dimensional diagram of the overall split structure of the utility model.

[0027] Figure 3 It is a side structural stereogram of the utility model.

[0028] Figure 4 It is the front view of the utility model.

[0029] In the figure, 1. clamp shell; 2. clamping assembly; 21. clamping plate; 22. friction groove; 23. connecting groove; 24. internal groove; 25. moving block; 26. screw; 27. rotating rod; 28. knob; 3. bottom plate; 4. auxiliary assembly; 41. telescopic rod; 42. spring; 43. vertical rod; 44. first rack; 45. gear; 46. second rack; 47. auxiliary clamping block; 48. support plate; 49. synchronization rod; 410. connecting plate. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] Example 1

[0032] Reference Figure 1-Figure 4, which is the first embodiment of the utility model, and provides a clamping mechanism of a tensile testing machine, comprising a clamp shell 1 and a bottom plate 3, wherein a clamping assembly 2 is disposed on the inner side of the clamp shell 1, and an auxiliary assembly 4 is disposed on the top of the bottom plate 3 and located on the outer side of the clamping assembly 2;

[0033] The clamping assembly 2 includes two clamping plates 21, which are slidably connected to the inner side of the clamp shell 1. A friction groove 22 is provided on the inner side of the clamping plate 21. The auxiliary assembly 4 includes a vertical rod 43, which is fixedly installed on the top of the base plate 3. A first rack 44 is fixedly installed on the top of the vertical rod 43. An internal groove 24 is provided inside the clamping plate 21. An auxiliary clamping block 47 is inserted into the internal groove 24. A second rack 46 is fixedly installed on the outer side of the auxiliary clamping block 47. A gear 45 is meshed on the top of the second rack 46, and the gear 45 is meshed on the inner side of the first rack 44.

[0034] Specifically. The inside of the clamp shell 1 is rotatably connected with a screw rod 26, and the outer side of the screw rod 26 is screwed with two moving blocks 25. A connecting groove 23 is provided at the bottom of the clamp plate 21, and the moving blocks 25 are fixed inside the corresponding connecting groove 23. The threads on both sides of the center of the screw rod 26 have different rotation directions, and the two moving blocks 25 are respectively screwed on the outer sides of the two parts of the thread rotation direction of the screw rod 26. The left and right sides of the clamp shell 1 are rotatably connected with a rotating rod 27, and the outer end of the rotating rod 27 is fixedly installed with a knob 28, and the inner end of the rotating rod 27 movably passes through the side wall of the clamp shell 1 and is fixedly connected to the screw rod 26.

[0035] Furthermore, when clamping the material, the material is placed between the two clamping plates 21, and the outer knob 28 is turned to drive the rotating rod 27 to rotate. The rotation of the rotating rod 27 can drive the inner screw 26 to rotate. The rotation of the screw 26 can drive the two moving blocks 25 thereon to move synchronously in the opposite direction, thereby realizing the synchronous opposite movement of the clamping plates 21 on both sides. The clamping and fixing of the material is achieved by the synchronous opposite movement of the clamping plates 21 on both sides of the material and the inner friction grooves 22. After the material is clamped and fixed, the clamping position of the material can be ensured to be in the center of the left and right sides through the synchronous opposite movement of the clamping plates 21, thereby achieving the effect of convenient clamping.

[0036] Example 2

[0037] Reference Figure 1-Figure 4 , which is the second embodiment of the utility model. This embodiment is based on the previous embodiment. A support plate 48 is fixedly installed on the top of the clamp shell 1. A synchronization rod 49 is rotatably connected to the inner side of the top of the support plate 48. Gears 45 are fixedly installed on both front and rear ends of the synchronization rod 49. A connecting plate 410 is fixedly installed between the outer ends of the front and rear corresponding second racks 46.

[0038] Specifically, a telescopic rod 41 is fixedly installed on the top of the base plate 3, the top of the telescopic rod 41 is fixedly installed on the bottom of the clamp shell 1, a spring 42 is wound around the outside of the telescopic rod 41, and the upper and lower sides of the spring 42 are respectively fixedly installed on the top of the base plate 3 and the bottom of the clamp shell 1.

[0039] Furthermore, the whole is connected to the tensile testing machine, the lower device is connected to the base of the tensile testing machine, and the upper device is connected to the horizontal frame of the tensile testing machine for increasing the tensile force. Both are connected and fixed by the bottom plate 3. After the material is clamped by the clamp plate 21, when the material is pulled, the clamp shell 1 will move away from the bottom plate 3. When moving away, the gear 45 will rotate along the first rack 44. The rotation of the gear 45 can drive the second rack 46 to move inward. The inward movement of the second rack 46 can drive the auxiliary clamp block 47 to move inward. The auxiliary clamp block 47 moves inward and can squeeze and clamp the internal material, thereby The pulling force during pulling can be converted into the clamping force of the auxiliary clamp block 47 on the material, so that the clamping force can continue to be provided to the material during pulling, which greatly reduces the probability of the material being separated from the clamp plate 21; and when the material is pulled, the telescopic rod 41 can limit the moving distance between the clamp shell 1 and the bottom plate 3 to ensure that the clamp shell 1 does not move too far, and the outer spring 42 can ensure that the clamp shell 1 will only move and the auxiliary clamp block 47 will only work when the pulling force is large, thereby ensuring that the auxiliary clamp block 47 will not work when the pulling force is small and the material is not easy to fall off.

[0040] Working principle: When clamping the material, place the material between the two clamping plates 21, and drive the rotating rod 27 to rotate by turning the outer knob 28. The rotation of the rotating rod 27 can drive the inner screw 26 to rotate, and the rotation of the screw 26 can drive the two moving blocks 25 thereon to move synchronously in the opposite direction, so that the clamping plates 21 on both sides can move synchronously in the opposite direction. The clamping and fixing of the material are achieved by the synchronous reverse movement of the clamping plates 21 on both sides of the material and the inner friction grooves 22. After the material is clamped and fixed, the clamping position of the material can be ensured to be in the center of the left and right sides through the synchronous reverse movement of the clamping plates 21, so as to achieve the effect of convenient clamping. The whole is connected to the tensile testing machine, the lower device is connected to the base of the tensile testing machine, and the upper device is connected to the horizontal frame of the tensile testing machine to increase the tensile force. Both are connected and fixed through the bottom plate 3. After the material is clamped by the clamping plates 21, when the material is pulled, the clamp shell 1 will move away from the bottom plate 3, and when moving away, the gear 45 will rotate along the first rack 44. The rotation of the gear 45 can drive the second rack 46 to move inwardly. The inward movement of the second rack 46 can drive the auxiliary clamping block 47 to move inwardly. The auxiliary clamping block 47 moves inwardly and can squeeze and clamp the internal material, so that the pulling force during pulling can be converted into the clamping force of the auxiliary clamping block 47 on the material, so that the material can continue to be provided with clamping force during pulling, which greatly reduces the probability of the material and the clamping plate 21 being separated; and when the material is pulled, the telescopic rod 41 can limit the moving distance between the clamp shell 1 and the bottom plate 3 to ensure that the clamp shell 1 does not move too far, and the outer spring 42 can ensure that the clamp shell 1 will move and the auxiliary clamping block 47 will work only when the pulling force is large, thereby ensuring that when the pulling force is small and the material is not easy to fall off, the auxiliary clamping block 47 will not work.

[0041] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

Claims

1. A clamping mechanism for a tensile testing machine, comprising a clamp housing (1) and a bottom plate (3), characterized in that: A clamping assembly (2) is arranged on the inner side of the clamp shell (1), and an auxiliary assembly (4) is arranged on the top of the bottom plate (3) and on the outer side of the clamping assembly (2); The clamping assembly (2) includes two clamping plates (21), the clamping plates (21) are slidably connected to the inner side of the clamp shell (1), and a friction groove (22) is provided on the inner side of the clamping plate (21). The auxiliary assembly (4) includes a vertical rod (43), the vertical rod (43) is fixedly mounted on the top of the base plate (3), and a first rack (44) is fixedly mounted on the top of the vertical rod (43). An internal groove (24) is provided inside the clamping plate (21), and an auxiliary clamping block (47) is inserted into the internal groove (24). A second rack (46) is fixedly mounted on the outer side of the auxiliary clamping block (47), and a gear (45) is meshed on the top of the second rack (46), and the gear (45) is meshed on the inner side of the first rack (44).

2. A clamping mechanism for a tensile testing machine according to claim 1, characterized in that: The clamp shell (1) is rotatably connected to a screw rod (26) on the inside, and two moving blocks (25) are screwed to the outside of the screw rod (26). A connecting groove (23) is provided at the bottom of the clamp plate (21), and the moving blocks (25) are fixed inside the corresponding connecting groove (23).

3. A clamping mechanism for a tensile testing machine according to claim 2, characterized in that: The threads on both sides of the center of the screw rod (26) have different rotation directions, and the two moving blocks (25) are respectively screwed on the outer sides of the two parts of the thread rotation direction of the screw rod (26).

4. A clamping mechanism for a tensile testing machine according to claim 3, characterized in that: The left and right sides of the clamp shell (1) are both rotatably connected to a rotating rod (27), the outer end of the rotating rod (27) is fixedly mounted with a knob (28), and the inner end of the rotating rod (27) movably penetrates the side wall of the clamp shell (1) and is fixedly connected to the screw rod (26).

5. The clamping mechanism of a tensile testing machine according to claim 1, characterized in that: A support plate (48) is fixedly mounted on the top of the clamp shell (1), a synchronization rod (49) is rotatably connected to the inner side of the top of the support plate (48), gears (45) are fixedly mounted on both the front and rear ends of the synchronization rod (49), and a connecting plate (410) is fixedly mounted between the outer ends of the front and rear corresponding second racks (46).

6. A clamping mechanism for a tensile testing machine according to claim 5, characterized in that: A telescopic rod (41) is fixedly mounted on the top of the base plate (3), the top of the telescopic rod (41) is fixedly mounted on the bottom of the clamp shell (1), a spring (42) is wound around the outside of the telescopic rod (41), and the upper and lower sides of the spring (42) are respectively fixedly mounted on the top of the base plate (3) and the bottom of the clamp shell (1).

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