Hydraulic horizontal pushing clamp special for short sample

Abstract

The invention discloses a hydraulic horizontal pushing clamp special for a short sample, and belongs to the technical field of clamp structures, the hydraulic horizontal pushing clamp comprises a clamp body and centering devices which are symmetrically arranged, the clamp body comprises an upper clamp body and a lower clamp body, the centering devices comprise an upper centering device and a lower centering device, and the clamp body comprises a clamp base and an end cover. The clamp base and the end cover are detachably connected, one end of the clamp base is provided with a joint which is assembled and connected with a testing machine, the inner wall of the clamp base is fixedly provided with a movable cylinder body wedge block, the inner wall of the clamp base is slidably connected with a movable cylinder body, and the end part of the movable cylinder body abuts against a clamp body. The clamp provided by the invention adopts a special structure of converting a wedge-shaped structure into a horizontal pushing structure, the coaxiality requirement of the hydraulic horizontal pushing clamp can be ensured by combining a high-strength spring reset principle, and meanwhile, the problem that the synchronism of other types of hydraulic horizontal pushing cylinders is difficult to adjust is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fixture structures, and particularly to a special hydraulic flat-push fixture for short specimens. Background Art

[0002] With the rapid development of materials science and engineering, some precious metal alloy materials have gradually been developed. Due to their high cost, the sizes of these materials are relatively small. Therefore, it is extremely important to evaluate the mechanical properties of these metal alloy materials. Usually, the tensile mechanical property test of metal materials is carried out according to GB / T 228.1-2021 "Metallic materials - Tensile testing - Part 1: Method of test at room temperature". Two conventional types of hydraulic fixtures, namely hydraulic wedge tensile fixtures and hydraulic flat-push tensile fixtures, basically meet the test requirements of this standard;

[0003] However, conventional hydraulic wedge tensile fixtures and hydraulic flat-push tensile fixtures cannot clamp specimens with extremely small clamping ends (usually about 10 mm at the clamping ends). Due to the structure of the current hydraulic fixture, if a specimen with a small size is forcibly clamped, an abnormal situation of the upper part being larger than the lower part at the clamping position of the jaws will occur, resulting in uneven clamping force on the specimen, and thus causing the specimen to slip during clamping or the fixture to be damaged. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art, and a special hydraulic flat-push fixture for short specimens is proposed.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A special hydraulic flat-push fixture for short specimens includes symmetrically arranged fixture bodies and a centering device. The fixture body includes an upper fixture body and a lower fixture body. The centering device includes an upper centering device and a lower centering device. The fixture body includes a fixture base and an end cover. The fixture base and the end cover are detachably connected. One end of the fixture base is provided with a joint for assembling and connecting with a testing machine. An active cylinder wedge is fixedly arranged on the inner wall of the fixture base. An active cylinder is slidably connected to the inner wall of the fixture base. The end of the active cylinder abuts against a fixture body. The active cylinder is connected to the active cylinder wedge through an active cylinder return spring; A rotating shaft is fixedly arranged inside the active cylinder. An active cylinder rotating shaft is rotatably arranged on the outer side wall of the rotating shaft. Push rods are arranged at both ends of the active cylinder rotating shaft;

[0007] The centering device includes an active slider. A jaw is arranged at the end of the active slider. A pinch-proof sheet metal is arranged at the end of the active slider.

[0008] As a preferred solution, the rotating shaft sleeve of the movable cylinder block is sleeved on the rotating shaft, and its two ends are respectively connected to the movable slider and the movable cylinder block through push rods.

[0009] As a preferred solution, the joint is connected to the fixture base through a locking nut to achieve the function of detachable installation.

[0010] As a preferred solution, there are two movable cylinder block return springs respectively arranged on both sides. One end of each spring is connected to the movable cylinder block, and the other end is connected to the movable cylinder block wedge.

[0011] As a preferred solution, the movable slider is located inside the end cover, and its bottom is in contact connection with the fixture body. Movable slider return springs connected to the movable slider are arranged on both sides of the fixture base.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] 1. The fixture proposed by the present invention fills the gap in the market for tensile mechanical property testing fixture for micro-sized specimens (generally referring to specimens with particularly small clamping end dimensions and particularly small parallel section dimensions). Due to its special clamping structure, this fixture can meet the testing requirements of specimens with an almost zero parallel section. Due to its special clamping structure, this fixture can meet the clamping requirements of almost all specifications of electronic extensometers.

[0014] 2. The fixture proposed by the present invention adopts a special structure of converting a wedge structure to a flat push structure, and combined with the principle of high-strength spring reset, it can ensure the coaxiality requirements of the hydraulic flat push fixture, and at the same time solve the problem of difficult synchronization adjustment of other types of hydraulic flat push cylinders (the hydraulic oil source cannot meet the high-precision synchronous control for the left and right separate flat push cylinders). BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is an assembly structure schematic diagram of a special hydraulic flat push fixture for short specimens proposed by the present invention;

[0016] Figure 2 is a three-dimensional structure schematic diagram of a special hydraulic flat push fixture for short specimens proposed by the present invention;

[0017] Figure 3 is a structure schematic diagram of the fixture body in a special hydraulic flat push fixture for short specimens proposed by the present invention;

[0018] Figure 4 is a cross-sectional structure schematic diagram of a special hydraulic flat push fixture for short specimens proposed by the present invention.

[0019] In the figure: 1. Connector; 2. Locking nut; 3. Fixture base; 4. Movable cylinder block; 5. Movable cylinder block return spring; 6. Push rod; 7. Rotating shaft; 8. Movable cylinder block wedge; 9. Movable cylinder block rotating shaft; 10. Fixture body; 11. Movable slider; 12. End cover; 13. Clamping jaw; 14. Anti-pinch sheet metal; 15. Movable slider return spring. Detailed implementation mode

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] Example, refer to Figures 1 to 4 , a special hydraulic flat-pushing fixture for short specimens, including symmetrically arranged fixture bodies and centering devices. The fixture bodies include upper fixture bodies and lower fixture bodies. The centering devices include upper centering devices and lower centering devices. The fixture body 10 includes a fixture base 3 and an end cover 12. The fixture base 3 and the end cover 12 are detachably connected. One end of the fixture base 3 is provided with a connector 1 for assembling and connecting with a testing machine. The connector 1 is connected to the fixture base 3 through a locking nut 2 to achieve the function of detachable installation.

[0024] The inner wall of the fixture base 3 is fixedly provided with a movable cylinder wedge 8. A movable cylinder 4 is slidably connected to the inner wall of the fixture base 3. A clamping body 10 is provided in contact with the end of the movable cylinder 4. The movable cylinder 4 is connected to the movable cylinder wedge 8 through a movable cylinder return spring 5. A rotating shaft 7 is fixedly provided inside the movable cylinder 4. A movable cylinder rotating shaft 7 is rotatably provided on the outer side wall of the rotating shaft 7. Push rods 6 are provided at both ends of the movable cylinder rotating shaft 7.

[0025] The movable slider 11 is located inside the end cover 12, and its bottom is in contact connection with the clamping body 10. Movable slider return springs 15 connected to the movable slider 11 are provided on both sides of the fixture base 3.

[0026] The centering device includes a movable slider 11. A jaw 13 is provided at the end of the movable slider 11. An anti-pinch sheet metal 14 is provided at the end of the movable slider 11. An anti-pinch sheet metal 14 protection device is integrated to establish a physical isolation safety zone, optimize the control of the jaw opening and closing stroke, achieve millimeter-level precise start and stop, and be equipped with a dual-redundancy hydraulic locking mechanism to ensure the clamping force is maintained in case of sudden power failure.

[0027] The movable cylinder rotating shaft 7 is sleeved on the rotating shaft 7, and its two ends are respectively connected to the movable slider 11 and the movable cylinder 4 through the push rods 6. Two movable cylinder return springs 5 are respectively provided on both sides. One end of each spring is connected to the movable cylinder 4, and the other end is connected to the movable cylinder wedge 8.

[0028] The fixture has a bilateral flat-push structure. Through the design of the bilateral flat-push clamping structure, the problem that conventional fixtures cannot clamp 10-mm-level micro-specimens is overcome. The unique wedge-flat-push composite structure effectively eliminates the clamping stress concentration phenomenon, avoids the "upper large and lower small" clamping deformation caused by traditional fixtures, and can stably clamp ultra-micro-specimens with a parallel section close to 0 mm, filling the technical gap in the field of micro material mechanics testing.

[0029] The oil inlet joint on the fixture base and the oil outlet joint on the clamping body are respectively connected to the oil source, and the oil pressure is adjusted by the oil source to further adjust the final clamping force of the fixture. The jaws of this fixture are convenient to replace. By removing the jaw stop block, jaws of different specifications can be replaced, which can meet the test requirements of specimens with different thicknesses.

[0030] This fixture is configured with a centering device, which can meet the centering requirements of plate specimens with different widths and is simple and convenient to operate. This fixture is configured with anti-pinch sheet metal, which can meet the safety requirements for placing and taking specimens in a narrow space.

[0031] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A hydraulic horizontal push fixture for short specimens, comprising a fixture body and a centering device which are symmetrically arranged, wherein the fixture body comprises an upper fixture body and a lower fixture body, and the centering device comprises an upper centering device and a lower centering device, characterized in that: The clamp body (10) comprises a clamp base (3) and an end cover (12), wherein the clamp base (3) and the end cover (12) are detachably connected, and a joint (1) for assembly connection with a testing machine is arranged at one end of the clamp base (3); a movable cylinder wedge (8) is fixedly arranged on the inner wall of the clamp base (3), and a movable cylinder (4) is slidably connected to the inner wall of the clamp base (3); a clamp body (10) is abutted against the end of the movable cylinder (4), and the movable cylinder (4) is connected to the movable cylinder wedge (8) via a movable cylinder return spring (5); a rotating shaft (7) is fixedly arranged inside the movable cylinder (4), and a movable cylinder rotating shaft (7) is rotatably arranged on the outer wall of the rotating shaft (7), and push rods (6) are arranged at both ends of the movable cylinder rotating shaft (7); The centering device comprises a movable slider (11), a jaw (13) is provided at the end of the movable slider (11), and an anti-pinch sheet metal (14) is provided at the end of the movable slider (11).

2. A hydraulic horizontal push fixture for short specimens according to claim 1, characterized in that: The movable cylinder body rotating shaft (7) is sleeved on the rotating shaft (7), and its two ends are respectively connected to the movable sliding block (11) and the movable cylinder body (4) through a push rod (6).

3. The hydraulic horizontal push fixture for short specimens according to claim 1 is characterized in that: The joint (1) is connected to the clamp base (3) via a locking nut (2) to achieve a detachable installation function.

4. The hydraulic horizontal push fixture for short specimens according to claim 1 is characterized in that: The movable cylinder body return spring (5) consists of two springs respectively arranged on both sides, one end of which is connected to the movable cylinder body (4) and the other end of which is connected to the movable cylinder body wedge block (8).

5. The hydraulic horizontal push fixture for short specimens according to claim 1 is characterized in that: The movable slider (11) is located inside the end cover (12), and its bottom is in contact with the clamp body (10). Both sides of the clamp base (3) are provided with movable slider return springs (15) connected to the movable slider (11).

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