Bidirectional flexible lever pressing device

Abstract

The invention discloses a bidirectional flexible lever pressing device, and relates to the technical field of machining clamps. The device comprises a lever force amplifying mechanism driven by an oil cylinder and a bidirectional flexible pressing assembly composed of a connecting block and a gland. The connecting block is connected with the main lever arm through a key groove structure and allows transverse swing. And the gland is matched with the connecting block through the square groove, and an assembly gap with uniform periphery is formed between the gland and the connecting block. By means of the structure, when a workpiece is pressed by the gland, self-adaptive fine adjustment can be conducted in the front, back, left and right directions according to the morphology difference and dimensional tolerance of the surface of the workpiece, and therefore it is guaranteed that pressing force is even and reliable. The problem that a traditional rigid gland cannot adapt to workpiece changes is solved, and the machining adaptability, the clamping reliability and the production efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of machining fixture technology, and specifically to a bidirectional flexible lever clamping device.

[0002] In mechanical milling, traditional fixtures often employ rigid pressure caps to clamp the workpiece. When the workpiece surface is uneven, has fluctuating dimensional tolerances, or inconsistent contours, the rigid pressure caps cannot adaptively conform to the workpiece surface, leading to uneven clamping force, clamping failure, or workpiece deformation, affecting machining accuracy and safety. Furthermore, traditional fixtures are only suitable for workpieces of specific specifications, resulting in long changeover and debugging times and low production efficiency. Therefore, it is necessary to provide a flexible clamping device that can adapt to changes in workpiece surface morphology and dimensions. Summary of the Invention

[0003] The purpose of this invention is to provide a bidirectional flexible lever clamping device that can automatically adjust the clamping posture according to the surface shape and size of the workpiece, so as to achieve reliable clamping and improve processing adaptability and efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A bidirectional flexible lever clamping device includes a cylinder body, a piston rod, a connecting rod, a main lever arm, a pin, a first pin, a second pin, a connecting block, a pressure cap, and a fixing screw. The left end face of the main lever arm is provided with a circular connecting block hole, and the upper end is provided with a screw hole that passes through the hole.

[0005] The connecting block is U-shaped, with a cylindrical shape on the right end and a longitudinal keyway hole along the axial direction. The left end of the connecting block is square, with a groove in the middle and a square boss on the far left. The square boss has a pin hole in the lateral direction.

[0006] The cover is a square block with a through square groove in the middle and a pin hole in the horizontal position of the square groove.

[0007] The fixing screw has an external thread at the upper end and a smooth section at the lower end.

[0008] The right end of the main lever arm is hinged to the piston rod via pin one, and the middle part is hinged to the connecting rod via pin two, thus forming a lever force amplification mechanism.

[0009] The cylindrical part at the right end of the connecting block is inserted into the connecting block hole of the main lever arm. The fixing screw passes through the screw hole of the main lever arm, and its smooth section passes into the keyway hole of the connecting block, thereby fixing the connecting block axially and allowing it to swing laterally within the keyway range.

[0010] The square boss on the left end of the connecting block is fitted with the square groove of the cover, and there is a uniform assembly gap between the two, preferably 0.2mm.

[0011] The pin passes through the pin holes of both the pressure cap and the connecting block, securing the two together.

[0012] Furthermore, the main lever arm, connecting rod, and piston rod constitute a rocker-slider mechanism, which converts the linear motion of the hydraulic cylinder into lever swing motion.

[0013] Furthermore, the assembly gap between the connecting block and the pressure cap allows the pressure cap to swing slightly in four directions (front, back, left, and right), forming a bidirectional flexible adjustment capability. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 This is a schematic diagram of the clamping action structure of the present invention; Figure 4 This is a schematic diagram of the releasing action structure of the present invention; Figure 5 This is a top view and a partial enlarged view of the present invention.

[0015] In the diagram: 1-Cylinder body; 2-Piston rod; 3-Connecting rod; 4-Main lever arm; 41-Screw hole; 42-Connecting block hole; 5-Pin one; 6-Pin two; 7-Pin; 8-Connecting block; 81-Keyway hole; 82-Pin hole one; 83-Square boss; 9-Pressure cap; 91-Square groove; 92-Pin hole two; 10-Fixing screw; 11-Assembly clearance; 12-Workpiece. Detailed Implementation

[0016] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings: like Figures 1-5 As shown, this device mainly consists of a hydraulic cylinder drive section and a flexible clamping section. When the hydraulic cylinder piston rod 2 extends, it drives the main lever arm (4) to swing around the second pin (6) via pin one (5), thereby pushing the connecting block (8) and the pressure plate (9) downward to achieve the clamping action. When the piston rod (2) retracts, the pressure plate (9) moves upward to release the workpiece (12).

[0017] The connecting block (8) engages with the smooth section of the fixing screw (10) through the keyway hole (81), allowing the connecting block (8) to have a certain degree of freedom of swing in the lateral direction. The pressure cap (9) engages with the square boss (83) of the connecting block (8) through the square groove (91), with a 0.2mm gap reserved around the perimeter, so that the pressure cap (9) can adaptively adjust in the front-back and left-right directions to fit the surface of the workpiece (12).

[0018] When the surface of the workpiece (12) is uneven or the size is inconsistent, the pressure cap (9) can automatically adjust its posture according to the shape of the workpiece (12) to maintain a uniform clamping force and avoid pressing off the workpiece (12) or damaging it.

[0019] The beneficial effects of this invention: 1. A lever-driven force-increasing mechanism achieves a large clamping force with a small thrust; 2. The bidirectional gap design between the connecting block and the gland enables the gland to have multi-directional self-adaptive capability, adapting to changes in the workpiece surface and size; 3. Compact structure, suitable for workpieces of various specifications, reducing fixture changeover time and improving processing efficiency and flexibility; 4. Applicable to automated machining scenarios such as milling machines and machining centers, improving clamping reliability and safety.

[0020] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A bidirectional flexible lever clamping device, characterized in that, Includes a hydraulically driven lever amplification mechanism and a bidirectional flexible clamping assembly connected thereto; The lever amplification mechanism includes a piston rod, a connecting rod, and a main lever arm; the first end of the main lever arm is hinged to the piston rod, and the middle part is hinged to the connecting rod; The bidirectional flexible clamping assembly includes a connecting block, a pressure cap, a fixing screw, and a pin; the connecting block has a cylindrical part with a longitudinal keyway hole at its right end and a square boss with a pin hole at its left end; the pressure cap has a square groove in the middle that mates with the square boss and a corresponding pin hole. The cylindrical part of the connecting block can be oscillatingly inserted into the mounting hole at the left end of the main lever arm, and is axially limited by the fixing screw passing through the keyway hole; the square boss of the connecting block is embedded in the square groove of the pressure cap with an assembly gap around it, and is fixedly connected by the pin.

2. The bidirectional flexible lever clamping device according to claim 1, characterized in that: The single-sided assembly gap between the square boss of the connecting block and the square groove of the pressure cap is 0.2mm.

3. A bidirectional flexible lever clamping device according to claim 1 or 2, characterized in that: The extension and retraction of the piston rod is converted into the pressing and releasing motion of the pressure cap by the lever amplification mechanism.

4. A bidirectional flexible lever clamping device according to claim 1 or 2, characterized in that: The keyway hole structure allows the connecting block to swing laterally, and the square groove mating clearance allows the gland to move in multiple directions. Together, the two enable the gland to have adaptive adjustment capabilities in the front-back and left-right directions.

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