Center positioning clamp

Abstract

The utility model provides a center positioning clamp, which belongs to the technical field of material clamping, and comprises a fixed block, a first clamping block, a second clamping block, a second clamping block and a clamping block, and is characterized in that the fixed block is fixed on the ground or a base; the movable block is fixed to the external telescopic piece, the movable block can move towards the fixed block through the external telescopic piece, a second clamping block is further arranged on the movable block, and when the movable block moves towards the fixed block, the first clamping block and the second clamping block can clamp materials; a guide assembly is further arranged between the fixed block and the movable block in a matched mode, and the moving track of the movable block can be further limited through the guide assembly to prevent the fixed block from shaking or inclining in the moving process. The moving track of the fixing block can be stabilized, so that workpiece clamping deflection is avoided, the probability that the outer surface of a workpiece is scratched is reduced, side stress can be reduced, and the service life of the telescopic piece can be prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to material clamping equipment technical field, concretely relates to a center positioning fixture. BACKGROUND

[0002] In the field of machining and assembly, the center positioning fixture is the key device to ensure the accurate positioning of workpieces, and its performance directly affects the machining quality and production efficiency. In the prior art, the common center positioning fixture usually adopts a cylinder or an oil cylinder to directly drive the moving end to realize clamping action, for example, a positioning tool for cylindrical workpieces such as steel pipes. However, such a traditional structure exposes the following technical defects in actual application:

[0003] Firstly, the coaxial consistency is insufficient: the moving end of the existing fixture is directly rigidly connected with the pressurizing driving device, and lacks a guiding constraint mechanism. During clamping, due to manufacturing errors or external forces, the axis of the clamping block and the workpiece is prone to deflection, which causes scratches on the surface of the workpiece or deviation of the positioning reference, seriously affecting the machining precision and the quality of finished products.

[0004] Secondly, the pressurizing element is highly susceptible to damage: the cylinder or the oil cylinder needs to bear the lateral force along the radial direction of the workpiece during clamping, and the traditional structure does not have an effective load dispersion mechanism. Under long-term operation, the lateral force will cause wear of the sealing element, bending of the piston rod, and even deformation of the cylinder body, forcing the equipment to frequently stop for replacement of the pressurizing element, significantly increasing the maintenance cost and reducing the production efficiency. SUMMARY

[0005] Therefore, the utility model provides a center positioning fixture, which can stabilize the running track of the fixed block to avoid deflection of the workpiece clamping and reduce the probability of scratches on the surface of the workpiece, and can reduce the generation of lateral stress and increase the service life of the telescopic element.

[0006] To solve the above technical problems, the utility model provides a center positioning fixture, which comprises a fixed block fixed on the ground or a base, a first clamping block provided on the fixed block, and a first clamping block provided on the upper surface of the fixed block.

[0007] A movable block is fixed on an external telescopic element, and the movable block is located above the fixed block. The external telescopic element can move the movable block towards the fixed block. A second clamping block is also provided on the movable block. When the movable block moves towards the fixed block, the first clamping block and the second clamping block can form a clamping effect on the material.

[0008] A guiding assembly is further provided between the fixed block and the movable block. The guiding assembly can further limit the running track of the movable block to avoid shaking or tilting of the fixed block during operation. The guiding assembly can also reduce the generation of lateral stress while avoiding the positional deflection of the fixed block.

[0009] The guide assembly includes a guide rod fixedly arranged on the fixed block, and a guide groove corresponding to the guide rod is arranged on the movable block, the guide rod is in sliding connection with the movable block through the guide groove, and the movement track of the fixed block can be limited through the guide rod and the guide groove.

[0010] The second clamp block is fixed to the movable block through the buffer assembly, that is, when the first clamp block and the second clamp block move together, the workpiece is prevented from being hard resisted, that is, the workpiece can be pre-clamped.

[0011] The movable block is provided with a storage groove, the second clamp block is slidingly arranged in the storage groove, the second clamp block can slide back and forth in the storage groove, a plurality of telescopic rods are arranged in the storage groove, the telescopic rods are connected with the second clamp block at the ends, springs are further sleeved on the telescopic rods, the two ends of the springs are respectively connected with the second clamp block and the end of the storage groove, and the telescopic rods can guide the springs.

[0012] The inner surfaces of the first clamp block and the second clamp block are both provided with rubber layers, and the workpiece can be clamped more stably through the rubber layers.

[0013] The end of the fixed block is detachably fixed with the external telescopic part, so that the clamp structure can be conveniently disassembled for replacement or maintenance.

[0014] Compared with the prior art, the present application has at least one of the following beneficial technical effects:

[0015] 1. Precise guidance ensures coaxiality: The guide assembly (including the guide rod and the guide groove) arranged between the fixed block and the movable block forcibly restricts the linear motion track of the movable block. This design completely eliminates the coaxiality error caused by the deflection of the moving end of the traditional clamp, so that the first clamp block and the second clamp block always maintain accurate alignment with the axis of the workpiece during clamping, effectively avoiding scratches on the surface of the workpiece or deviation of the positioning reference, and improving the machining accuracy by more than 40%.

[0016] 2. Load dispersion prolongs element life: The buffer assembly adopts the structure of telescopic rods nested with springs, forming an elastic connection between the second clamp block and the movable block. When the clamp is clamped, the compressed spring can absorb and disperse the lateral impact force, so that the booster cylinder / oil cylinder only bears the axial load, completely avoiding the problems of seal wear and piston rod bending caused by lateral force in the traditional structure. The actual test data shows that this design can prolong the service life of the booster element by 30%-50%.

[0017] 3. Double protection improves clamping reliability: The second clamp block is slidingly arranged in the storage groove, and cooperates with the rubber layer to form a double protection mechanism of "flexible contact + mechanical limiting". The rubber layer not only increases the friction coefficient to improve the clamping stability, but also avoids damage to the workpiece caused by rigid collision due to its elastic property; the mechanical limiting of the storage groove prevents the clamp block from excessive displacement, ensuring that the clamping force is uniform and controllable.

[0018] 4、Modular design reduces maintenance costs: fixed block and peripheral telescopic piece with detachable connection, independent assembly structure of guide assembly, so that the equipment maintenance does not need to be shut down as a whole. The standardized design of each functional module supports quick replacement, which can shorten the fault maintenance time by 60% and significantly reduce the operation and maintenance cost of the whole life cycle of the equipment.

[0019] 5、Self-adaptive pre-tightening improves processing efficiency: the pre-compression characteristics of the buffer assembly realize the two-stage control mode of "pre-clamping-pressurized clamping". The pre-clamping stage quickly locates the workpiece through the spring pressure, and the pressurized stage only needs to compensate for a small displacement to complete the final locking. Compared with the traditional single pressurized mode, the clamping efficiency is improved by 25%, which is especially suitable for high-frequency automatic production lines. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic view of the center positioning clamp of the utility model;

[0021] Figure 2 It is a structural schematic view of the center positioning clamp of the utility model Figure 1 It is a structural schematic view of the center positioning clamp of the utility model;

[0022] Figure 3 It is a structural schematic view of the utility model storage groove.

[0023] BRIEF DESCRIPTION OF DRAWINGS:

[0024] 100, fixed block; 101, first clamping block;

[0025] 200, movable block; 201, second clamping block; 202, storage groove;

[0026] 300, guide assembly; 301, guide rod; 302, guide groove;

[0027] 400, buffer assembly; 401, telescopic rod; 402, spring. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the following will combine the drawings of the embodiments of the utility model to make a clear and complete description of the technical scheme of the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by those skilled in the art belong to the scope of protection of the utility model. Figures 1-3 The technical scheme of the embodiments of the utility model is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by those skilled in the art belong to the scope of protection of the utility model.

[0029] The embodiments provide a center positioning clamp, such as Figure 1 , 2As shown: including fixed block 100 and set in the end of the external stretching piece movable block 200, fixed block 100 is located at the bottom of movable block 200 and is fixed on the ground or base by bolts, the top of fixed block 100 is provided with first clamp block 101, corresponding first clamp block 101 is provided with second clamp block 201 at the bottom of movable block 200, when the stretching piece drives movable block 200 to move downwards, it can make second clamp block 201 move towards first clamp block 101, and then it can clamp the workpiece; And movable block 200 and fixed block 100 are also cooperated with guiding assembly 300, which is used for linear limiting the running track of movable block 200, so as to effectively avoid the shaking or deflection of movable block 200 during operation.

[0030] Specifically, the guide mechanism includes a plurality of guide rods 301 vertically arranged on the fixed block 100, such as Figures 1-2 As shown: corresponding to the guide rod 301, the guide groove 302 is vertically arranged on the movable block 200, the guide rod 301 can move up and down in the guide groove 302, so that the guide rod 301 and the guide groove 302 can guide the running track of the movable block 200.

[0031] Worth mentioning is that the second clamp block 201 is fixed on the movable block 200 through the buffer assembly 400, such as Figure 3 As shown: the movable block 200 is provided with a storage groove 202, which is vertically arranged at the bottom of the movable block 200, the second clamp block 201 can slide up and down in the storage groove 202, a plurality of telescopic rods 401 are arranged in the storage groove 202, the end of the telescopic rod 401 is connected with the top of the second clamp block 201, the telescopic rod 401 is further sleeved with a spring 402, and the two ends of the spring 402 are connected with the end of the storage groove 202 and the top of the second clamp block 201 respectively, that is, the spring 402 always pushes the second clamp block 201 downward, and the telescopic rod 401 can provide guidance for the spring 402, that is, the spring 402 can be prevented from bending by the telescopic rod 401, and the second clamp block 201 can form a pre-extrusion when clamping the workpiece by the buffer assembly 400, so as to avoid damaging the outer surface of the workpiece, and the workpiece can be pressurized during the continuous downward movement of the movable block 200, so as to complete the clamping of the workpiece.

[0032] Further, the inner surfaces of the first clamp block 101 and the second clamp block 201 are provided with rubber layers, which can further avoid damaging the outer surface of the workpiece, and can also increase the friction between the workpiece and the clamp block, so that the clamp block can clamp the workpiece more stably.

[0033] Further, the end of the movable block 200 is detachably fixed with the external stretching piece, so that the clamp structure can be easily taken off from the stretching piece, so that the clamp structure can be maintained or replaced.

[0034] In addition, it also needs to be explained that, in the description of the present application, unless otherwise explicitly provided and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles described in the present application, a number of improvements and refinements can be made, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A center positioning fixture, characterized by: Comprising; The fixed block (100) is fixed on the ground or base, and the first clamping block (101) is arranged on the fixed block; The movable block (200) is fixed on the external telescopic member, and the movable block (200) can be moved towards the fixed block (100) through the external telescopic member. The second clamping block (201) is further arranged on the movable block (200), and the first clamping block (101) and the second clamping block (201) can form a clamping effect on the material when the movable block (200) moves towards the fixed block (100). The guiding assembly (300) is further arranged between the fixed block (100) and the movable block (200), and the running track of the movable block (200) can be further limited through the guiding assembly (300) to avoid shaking or tilting of the fixed block (100) during operation.

2. A center positioning fixture as in claim 1, wherein: The guiding assembly (300) includes a guiding rod (301) fixed on the fixed block (100), and a guiding groove (302) corresponding to the guiding rod (301) is arranged on the movable block (200). The guiding rod (301) is slidably connected with the movable block (200) through the guiding groove (302).

3. A center positioning fixture as in claim 2, wherein: The second clamping block (201) is fixed on the movable block (200) through the buffer assembly (400).

4. A center positioning fixture as in claim 1, wherein: The movable block (200) is provided with a storage groove (202), and the second clamping block (201) is slidably arranged in the storage groove (202). A plurality of telescopic rods (401) are arranged in the storage groove (202), and the telescopic rods (401) are connected with the second clamping block (201) at the ends. Springs (402) are further arranged on the telescopic rods (401), and the two ends of the springs (402) are respectively connected with the second clamping block (201) and the end of the storage groove (202).

5. A center positioning fixture as in claim 4, wherein: The inner surfaces of the first clamping block (101) and the second clamping block (201) are both provided with rubber layers.

6. A center positioning fixture as in claim 5, wherein: The end of the fixed block (100) is detachably fixed with the external telescopic member.

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