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CN-121715888-B - Heavy workpiece shaft part clamping tool with multistage buffering function

CN121715888BCN 121715888 BCN121715888 BCN 121715888BCN-121715888-B

Abstract

The invention relates to the technical field of machining, in particular to a heavy workpiece shaft part clamping tool with multistage buffering, which comprises a supporting plate and two clamping claws, wherein the two clamping claws are used for jointly clamping a main rod of a workpiece, a first supporting point is arranged at a position close to the middle of the two clamping claws, a second supporting point is arranged between the first supporting point and a rotating shaft, a limiting groove is formed in the supporting plate, a shaft rod is movably arranged in the limiting groove, two ends of the shaft rod are respectively connected with a hydraulic rod for providing hydraulic supporting force, the outer wall of the supporting plate is provided with a buffering mechanism, the elastic movable end of the buffering mechanism is abutted against the second supporting point of the clamping claws, and the buffering mechanism is cooperated with the hydraulic rod to greatly prolong the time for stopping the deceleration of the heavy workpiece when the heavy workpiece falls, so that the instant rigid impact is converted into a controllable buffering process, and the permanent deformation or damage of the clamp structure caused by huge impact force is fundamentally avoided.

Inventors

  • ZHANG LIU
  • JI WENFEI

Assignees

  • 如皋爱科自动化设备有限公司

Dates

Publication Date
20260505
Application Date
20260226

Claims (6)

  1. 1. The heavy workpiece shaft part clamping tool with the multistage buffering function comprises a supporting plate (210) and two clamping claws (220) which are rotatably arranged on the supporting plate (210) through a rotating shaft, wherein the two clamping claws (220) are used for jointly clamping a main rod (100) of a workpiece, and the heavy workpiece shaft part clamping tool is characterized in that a first supporting point position (260) is arranged at a position close to the middle of the two clamping claws (220), and a second supporting point position (270) is arranged between the first supporting point position (260) and the rotating shaft; A limit groove (213) is formed in the support plate (210), a shaft lever (240) is movably arranged in the limit groove (213), and two ends of the shaft lever (240) are respectively connected with a hydraulic rod (230) for providing hydraulic support force; A connecting rod (250) is movably connected between the shaft lever (240) and the first supporting point (260), so that the shaft lever (240) can act on the first supporting point (260) of the clamping claw (220) through the connecting rod (250); the outer wall of the supporting plate (210) is provided with a buffer mechanism (300), and the elastic movable end of the buffer mechanism (300) is abutted with a second supporting point (270) of the clamping claw (220); The hydraulic supporting force of the hydraulic rod (230) and the elastic force of the buffer mechanism (300) jointly form buffer and support for the two clamping claws (220); The two hydraulic rods (230) are used for providing downward pulling force after the main rod (100) is clamped so as to increase the clamping force of the clamping claw (220); The buffer mechanism (300) comprises a buffer bin (310), the buffer bin (310) is fixedly connected with the surface of the supporting plate (210), and the buffer bin (310) is hollow; A plurality of springs (320) are fixedly connected inside the buffer bin (310), the springs (320) are made of cylindrical spiral high-strength alloy spring steel, a buffer plate (330) is fixedly connected to the other end of the springs (320), and the clamping claws (220) rotate to be in contact with the buffer plate (330), so that the springs (320) are extruded; The contact surface of the buffer plate (330) and the clamping claw (220) is an arc-shaped surface, and is matched with the outer contour of the clamping claw (220).
  2. 2. The heavy workpiece shaft part clamping tool with multistage buffering as set forth in claim 1, wherein the lower end of the supporting plate (210) is fixedly connected with a clamping seat (200), and the clamping seat (200) is used for fixing the whole tool on an external foundation through bolts.
  3. 3. The heavy workpiece shaft part clamping tool with multistage buffering as set forth in claim 1, wherein the surface of the supporting plate (210) is provided with an axle center hole (211) and a rotating groove (212), the lower end of the clamping claw (220) rotates by taking the axle center hole (211) as an axle point, and the rotating angle of the clamping claw (220) is limited by the rotating groove (212).
  4. 4. The heavy workpiece shaft clamping tool with multistage buffering as recited in claim 3, wherein the rotating groove (212) is an arc-shaped groove.
  5. 5. The heavy workpiece shaft part clamping tool with multistage buffering according to claim 1, wherein four connecting rods (250) are arranged on the surface of the shaft rod (240), and the other ends of the four connecting rods (250) are respectively and rotatably connected with two clamping claws (220).
  6. 6. The heavy workpiece shaft clamping fixture with multi-stage buffering as set forth in claim 1, wherein two hydraulic levers (230) are used for providing upward thrust in an initial state to support the clamping jaw (220) in an open standby position.

Description

Heavy workpiece shaft part clamping tool with multistage buffering function Technical Field The invention relates to the technical field of machining, in particular to a heavy workpiece shaft part clamping tool with multistage buffering. Background In the field of machining, for clamping shaft workpieces, the use of clamping jaws that rotate about a rotational axis is a very common and efficient tool structure. However, in practice, many shaft-like workpieces are not independent optical axes, and all have additional integrated devices or complex structures on the shaft. A typical example is a steam turbine rotor, in which a large number of blades are mounted on a main rod, and the entire rotor is required to be clamped as a whole when performing processing such as blade profile grinding. This results in a dramatic increase in the total weight of the workpiece, typically up to 5 to 20 tons, far beyond the usual shaft. For the heavy composite workpiece, the technical defect is mainly that the huge weight of the heavy composite workpiece can be converted into impact load to act on the clamping jaw at the moment when the clamping jaw receives the heavy workpiece. Because the clamping jaw is a lever structure rotating around the rotating shaft, potential energy of falling of a workpiece can be instantaneously converted into rotational kinetic energy of the clamping jaw. This means that the deceleration stop of the weight of the workpiece takes place in an extremely short time, and a large impact force will be generated according to the momentum theorem. The impact force directly acts on the rotating shaft of the clamping jaw and the supporting structure thereof, so that the permanent bending deformation of the rotating shaft, the damage of the bearing and even more serious structural failure are easily caused. The processing precision is affected, the safety of equipment and personnel is threatened, and the reliability and the service life of the tool are greatly reduced. In view of the foregoing, there is a need for a heavy workpiece shaft clamping tool with multi-stage buffering that ameliorates the deficiencies of the prior art. Disclosure of Invention The invention aims to provide a heavy workpiece shaft part clamping tool with multistage buffering, which forms an efficient two-stage buffering system together by the cooperation of a hydraulic rod arranged below a clamping jaw and a buffering mechanism on a supporting plate. When heavy work pieces fall, the system can greatly prolong the time for decelerating and stopping, so that the instantaneous rigid impact is converted into a flexible and controllable buffering process, and the permanent deformation or damage of the clamping jaw rotating shaft and the supporting structure caused by huge impact force is fundamentally avoided, so that the problems in the background art are solved, namely: when a heavy workpiece falls and is received by the jaws, its tremendous weight is converted into an impact load on the jaws. Because the clamping jaw is a lever structure rotating around the rotating shaft, potential energy of falling of a workpiece can be instantaneously converted into rotational kinetic energy of the clamping jaw. This means that the deceleration stop of the weight of the workpiece takes place in an extremely short time, and a large impact force will be generated according to the momentum theorem. In order to achieve the above purpose, the invention provides a heavy workpiece shaft part clamping tool with multistage buffering, which comprises a supporting plate and two clamping claws which are rotatably arranged on the supporting plate through a rotating shaft, wherein the two clamping claws are used for jointly clamping a main rod of a workpiece, a first supporting point position is arranged at a position close to the middle part of the two clamping claws, and a second supporting point position is arranged between the first supporting point position and the rotating shaft; The support plate is provided with a limit groove, the shaft lever is movably arranged in the limit groove, and two ends of the shaft lever are respectively connected with a hydraulic lever for providing hydraulic support force; A connecting rod is movably connected between the shaft rod and the first supporting point, so that the shaft rod can act on the first supporting point of the clamping claw through the connecting rod; The outer wall of the supporting plate is provided with a buffer mechanism, and the elastic movable end of the buffer mechanism is abutted with the second supporting point of the clamping claw; The hydraulic supporting force of the hydraulic rod and the elastic force of the buffer mechanism jointly form buffer and support for the two clamping claws. According to the technical scheme, when the main rod of the heavy workpiece falls and is supported by the two clamping claws, impact force is transmitted to the shaft rod through the connecting rod through the first