Clamping device for tension test

Abstract

The utility model relates to a fixing device, in particular to a clamping device for a tension test. A clamping device for tension testing comprises a mounting block fixedly mounted with a tension testing device, a telescopic cylinder for pushing a sliding rail to move back and forth is fixed at the tail end of the mounting block, two sliding blocks are arranged on the sliding rail in a midline mirror image mode, and clamping jaws for clamping workpieces are fixed on the outer sides of the two sliding blocks. According to the clamping device for the tension test, the telescopic air cylinder drives the sliding rail to move front and back, the sliding blocks which are in mirror symmetry about the center line of the sliding rail are driven to slide synchronously, the clamping jaws on the two sides get close to or are separated from the center line, rapid clamping or releasing of a workpiece is achieved, and operation efficiency is improved; the linear motion of the sliding rail is accurately controlled by the air cylinder, so that the clamping force is uniform and stable, and the clamping force fluctuation caused by manual operation is avoided; the clamping jaws are directly fixed to the outer sides of the sliding blocks, and the clamping faces of the clamping jaws can be matched with workpieces of different sizes.

Description

Technical Field

[0001] This utility model relates to a fixing device, and more particularly to a clamping device for tensile testing. Background Technology

[0002] In the field of materials mechanics testing, traditional clamping devices often rely on manually driven shafts to move elbow clamps or multiple sets of fasteners to fix workpieces step by step, which has drawbacks such as cumbersome operation, unstable clamping force, and poor adaptability. Although existing improved solutions introduce cylinder drives to improve automation, they still face problems such as structural redundancy and insufficient adjustment flexibility.

[0003] In view of the above-mentioned shortcomings, the designer actively researched and innovated in order to create a clamping device for tensile testing, which would have greater industrial application value. Utility Model Content

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a clamping device for tensile testing.

[0005] The present invention discloses a clamping device for tensile testing, comprising a mounting block fixedly installed with a tensile testing device, a telescopic cylinder for pushing a slide rail to move back and forth fixed at the tail end of the mounting block, two sliders mirror images of the slide rail with respect to its centerline, and claws for clamping workpieces fixed on the outer sides of the two sliders.

[0006] A clamping device for tensile testing uses a telescopic cylinder to drive a slide rail to move back and forth, causing a slider that is mirror-symmetrical about the center line of the slide rail to slide synchronously. This allows the jaws on both sides to move closer to or separate from the center line, enabling rapid clamping or release of the workpiece and improving operational efficiency. The linear movement of the slide rail is precisely controlled by the cylinder to ensure uniform and stable clamping force, avoiding clamping force fluctuations caused by manual operation. The jaws are directly fixed to the outside of the slider, and their clamping surfaces can be adapted to workpieces of different sizes.

[0007] Furthermore, the telescopic cylinder's telescopic rod is fixedly connected to the top plate, the two sides of the top plate are fixedly connected to the push rod, one end of the push rod is fixedly connected to the slide rail, and the other end of the push rod is inserted into the guide sleeves on both sides of the mounting block.

[0008] Power is transmitted through the telescopic rod of the telescopic cylinder driving the top plate. The push rods fixed on both sides of the top plate move synchronously with the extension and retraction of the cylinder. One end of the push rod is rigidly connected to the slide rail to push the slide rail to move back and forth, and the other end is inserted into the guide sleeves on both sides of the mounting block to form a sliding pair, ensuring the linear accuracy of the push rod's movement trajectory and reducing offset friction. The linear displacement of the slide rail is transmitted to the mirror-symmetrical slider through the cooperation of the push rod and the guide sleeve, which drives the chuck to complete the action of clamping or releasing the workpiece. The guide sleeve structure effectively improves the rigid support and torsional resistance of the push rod.

[0009] Furthermore, the top plate has through holes at both ends for the push rod to pass through. There are openings on the outside of the through holes, and there are screw holes on the top plate outside the through holes. A bolt is screwed into the screw hole to close the opening and lock the push rod.

[0010] Push rods are inserted through the through holes at both ends of the top plate. The outer opening is tightened with bolts in the screw holes to achieve radial locking of the push rods, ensuring rigid fixation when the slide rail and push rods are linked. After the bolts are locked, the push rods form a rigid connection with the top plate. Combined with the guide sleeve for linear guidance of the push rods, the driving force of the telescopic cylinder is accurately transmitted to the slide rail. This structure allows for quick adjustment of the locking position of the push rods with bolts, enabling flexible control of the slide rail stroke and reducing vibration errors caused by cylinder pressure fluctuations.

[0011] Furthermore, an upper vertical plate and a lower vertical plate are fixed on both sides of the tail end of the slide rail. The protrusion connected below the slider on the left side is fixedly connected to the telescopic rod of the lower cylinder, and the tail end of the lower cylinder is fixedly connected to the lower vertical plate. The protrusion connected above the slider on the right side is fixedly connected to the telescopic rod of the upper cylinder, and the tail end of the upper cylinder is fixedly connected to the upper vertical plate.

[0012] The upper and lower upright plates of the slide rail are fixed to the support frame. The protrusion below the left slider is fixed to the telescopic rod of the lower cylinder, and the tail end of the lower cylinder is fixed to the lower upright plate to provide driving force. The protrusion above the right slider is fixed to the telescopic rod of the upper cylinder, and the tail end of the upper cylinder is fixed to the upper upright plate to achieve reverse driving force. The upper and lower cylinders extend and retract synchronously to drive the slider to move symmetrically along the slide rail. This symmetrical structure balances the load and improves the stability and positioning accuracy of the slider movement.

[0013] Furthermore, the upper end of the chuck is fixed with an inwardly extending chuck block by bolts, and the inner side of the chuck block is arc-shaped.

[0014] The chuck is fixed to the upper chuck block by bolts. The inner side of the chuck block adopts an arc-shaped structure to adapt to the outer diameter of the cylindrical material. During installation, the position and curvature accuracy of the chuck block need to be calibrated to ensure that the clamping stress is evenly distributed.

[0015] Furthermore, the inner end face of the card block has a concave groove.

[0016] The inner end face of the clamping block is provided with a recessed groove to adapt to the outer diameter of the cylindrical workpiece and enhance the clamping contact area. The curvature of the groove needs to match the size of the workpiece to evenly distribute the clamping stress.

[0017] By means of the above-described solution, the present invention has at least the following advantages:

[0018] 1. Improved clamping stability and precision: The rigid connection structure between the protrusion and the support enhances the radial support force on thin-walled workpieces, effectively suppressing roundness deviation caused by elastic deformation during testing;

[0019] 2. Stress distribution optimization and damage control: The groove structure and inverted cone angle design increase the clamping contact area, evenly distribute the clamping stress, reduce the risk of indentation or scratches on the surface of thin-walled workpieces, and at the same time reduce the positioning offset caused by scrap rebound;

[0020] 3. Adaptive adjustment and multi-station compatibility: It can adapt to the inner diameter of workpieces of different sizes, and with the multi-station synchronous clamping mechanism, the clamping stability is good.

[0021] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show a certain embodiment of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is the utility model Figure 1 The main view;

[0025] In the diagram: 1. Mounting block, 2. Slide rail, 3. Telescopic cylinder, 4. Slider, 5. Claw, 6. Top plate, 7. Push rod, 8. Upper upright plate, 9. Lower upright plate, 10. Lower cylinder, 11. Upper cylinder, 12. Clamping block. Detailed Implementation

[0026] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0027] See Figure 1 The device drives the slide rail 2 to move back and forth via the telescopic cylinder 3, which in turn drives the sliders 4 on both sides to slide synchronously along the center line of the slide rail. This allows the jaws 5 to form a symmetrical clamping force on the workpiece. During the clamping process, the stress on the contact surface between the jaws and the workpiece is evenly distributed to reduce the risk of local pressure damage. Its advantages lie in the use of a cylinder-driven and mirror slider linkage structure, which enables rapid response and high-precision centering and clamping, improves testing efficiency and reduces manual adjustment errors. At the same time, the adjustable slide rail stroke design adapts to workpieces of different sizes, and the rigid jaw structure effectively prevents the workpiece from slipping or deflecting during the test, ensuring the accuracy of the tensile force data.

[0028] The device uses a telescopic cylinder 3 to drive the top plate 6, which in turn drives the push rods 7 on both sides to slide linearly along the guide sleeve of the mounting block 1. The push rods 7 are rigidly connected to the slide rail 2 to achieve bidirectional synchronous push-pull action. The guide sleeve constrains the movement trajectory of the push rods to eliminate lateral deviation and reduce friction loss. Its advantages are that the push rod and guide sleeve combination structure enhances the rigidity of the system, ensuring stable and reliable push-pull action under high load. At the same time, the cylinder direct connection to the top plate design shortens the power transmission chain, improves response speed and positioning accuracy, and the slide rail stroke adaptive adjustment function can be compatible with different size testing requirements. The wear-resistant bushing embedded in the guide sleeve extends the maintenance cycle and reduces operating noise.

[0029] The device achieves rapid positioning and rigid fixation of the push rod 7 through the opening contraction locking structure on the outside of the through hole 6 in the top plate: when the bolt is screwed into the bolt hole in the top plate, the opening contracts under radial pressure, forming a clamping force on the push rod 7, eliminating the gap between the push rod and the through hole and enhancing clamping stability. Its advantages are that the bolt-adjustable locking mechanism can flexibly adapt to different push rod position requirements, avoiding the problems of complicated assembly or uneven preload caused by traditional threaded fastening. At the same time, the uniform radial pressure generated by the opening contraction can effectively prevent the push rod from loosening or shifting under high-frequency push-pull action, improving the vibration resistance and repeatability accuracy of the test process. The modular bolt design also facilitates disassembly, maintenance or replacement of worn parts, reducing long-term use costs.

[0030] See Figure 2 The slide rail system uses a lower cylinder 10 and an upper cylinder 11 to drive the protrusion below the left slider 4 and the protrusion above the right slider 4 respectively, forming a bidirectional symmetrical force application mode. The tail ends of the two cylinders are fixed to the lower upright plate 9 and the upper upright plate 8 respectively to provide rigid support, enabling the left and right sliders to move synchronously or asynchronously at different heights on the slide rail 2. Its advantages are that the dual-axis drive structure composed of the upper and lower upright plates and cylinders can effectively distribute the load stress and avoid the risk of slide rail deformation caused by unilateral pressure. At the same time, the independent control of the upper and lower cylinders can adapt to asymmetrical clamping requirements. The slider position can be precisely controlled by adjusting the cylinder stroke parameters. The fixed design of the upright plate and the tail end of the slide rail enhances the overall anti-torsion ability and ensures the stability of the system under high-frequency reciprocating motion. The modular cylinder layout also facilitates maintenance and replacement and reduces space occupation.

[0031] The inner side of the upper end of the chuck 5 has a quick-change structure for the clamping block 12. It can be selected according to the material to be clamped. The inner side of the arc-shaped clamping block 12 can quickly contact the workpiece surface, resulting in a good clamping effect.

[0032] The recessed groove on the inner end face of the clamping block 12 forms a multi-point interlocking contact by adapting to the protrusions or embedded structures on the workpiece surface. The groove contour matches the local geometric features of the workpiece to enhance the clamping friction. Its advantage is that the groove structure can disperse the clamping stress to the edge contact surface of the groove when the bolt is pre-tightened, avoiding local slippage or stress concentration caused by planar contact. At the same time, the groove's self-adaptability can accommodate the clamping requirements of irregular workpiece outer contours and maintain clamping stability in dynamic rotation or high-frequency vibration scenarios.

[0033] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0034] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0035] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A clamping device for tensile testing, comprising a mounting block (1) fixedly mounted with a tensile testing device, characterized in that: The tail end of the mounting block (1) is fixed with a telescopic cylinder (3) for moving the push slide rail (2) forward and backward, the slide rail (2) is provided with two sliders (4) in mirror image along the center line, and the outer sides of the two sliders (4) are fixed with clamping jaws (5) for clamping workpieces.

2. The clamping device for tension testing according to claim 1, characterized in that: The telescopic rod of the telescopic cylinder (3) is fixedly connected with a top plate (6), the two sides of the top plate (6) are fixedly connected with push rods (7), one end of the push rod (7) is fixedly connected with the slide rail (2), and the other end of the push rod (7) is inserted into the guide sleeves on the two sides of the mounting block (1).

3. The clamping device for tension testing according to claim 2, characterized in that: The two ends of the top plate (6) have through holes for the push rods (7) to pass through, the outer sides of the through holes have openings, the outer sides of the through holes on the top plate (6) have screw holes, and the openings are retracted by screwing bolts into the screw holes for locking the push rods (7).

4. The clamping device for tension testing according to claim 1, characterized in that: The two sides of the tail end of the slide rail (2) are fixed with upper vertical plates (8) and lower vertical plates (9), the convex blocks connected below the left slider (4) are fixedly connected with the telescopic rods of a lower cylinder (10), the tail end of the lower cylinder (10) is fixedly connected with the lower vertical plate (9), the convex blocks connected above the right slider (4) are fixedly connected with the telescopic rods of an upper cylinder (11), and the tail end of the upper cylinder (11) is fixedly connected with the upper vertical plate (8).

5. The clamping device for tension testing according to claim 1, characterized in that: The upper end of the clamping jaw (5) is fixedly connected with an inwardly extending clamping block (12) through a bolt, and the inner side of the clamping block (12) is arc-shaped.

6. The clamping device for tension testing according to claim 5, characterized in that: The inner side end face of the clamping block (12) has a concave groove.

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