Movable claw holding clamp for forging and pressing large crank throw

Abstract

According to the movable claw holding clamp for forging and pressing the large crank throw, the clamping claw and the clamp arm of the holding clamp are arranged in a split mode, the clamping claw and the clamp arm are assembled into a rotating moving pair through the pin shaft, the clamping claw holds and clamps a forge piece in the maximum area, and therefore the holding and clamping indentation is minimum. The utility model has the advantages of reasonable design, simple structure, stable gripping, small indentation and the like.

Description

Technical Field

[0001] This utility model relates to a clamp for forging large cranks, specifically a clamp that leaves a lighter gripping indentation during the clamping of crank forgings, and belongs to the field of mechanical manufacturing technology. Background Technology

[0002] Crank forgings have complex shapes and involve numerous production steps. Large clamps are required for forging, but due to their weight, the clamping force on the forging is high. Because the clamping jaws are rigid and lack flexibility, they often only partially contact the forging, resulting in a small gripping area and deep scratches on the gripped area, sometimes even damaging the forging. Therefore, designing new types of clamps that can grip the forging flexibly is key to solving these problems. Summary of the Invention

[0003] In response to the problems mentioned in the background art, this utility model proposes a movable jaw clamp for forging large cranks, which sets the clamping jaws and clamping arms as separate parts and adopts a rocker arm assembly to achieve the purpose of large clamping area and small indentation.

[0004] To achieve the above objectives, this utility model proposes a movable jaw clamp for forging large crank forgings, comprising: two clamp arms, each clamp arm equipped with a gripper; the two clamp arms open and close, and the gripper grips the crank forging; characterized in that:

[0005] The clamp arm and gripper are separately configured, and a pin is provided between the clamp arm and gripper, and they are movably connected by the pin;

[0006] The gripper is configured in a "U" shape, and the end of the gripper arm is configured in a "T" shape. The two sides of the "U" shape and the "T" shape are respectively provided with pin holes. The pin passes through the pin holes, and the "U" shape, the "T" shape and the pin form a rotating pair.

[0007] The bottom of the "U" shape is provided with a concave arc surface, and the contact part of the "T" shape with the concave arc surface is provided with a convex arc surface. The convex arc surface and the concave arc surface are coupled with each other to bear the pressure of the gripper.

[0008] The pin hole is an oblong hole, and the pin slides along the major diameter direction of the oblong hole;

[0009] As the gripper slides along or rotates around the pin, the concave arc surface at the bottom of the "U" shape moves on the convex arc surface of the "T" shape and presses against the convex arc surface of the "T" shape.

[0010] Furthermore, limiting blocks are provided on the left and right sides of the "T" shape, and left and right limiting surfaces are provided on the two sides of the "U" shape respectively. The leftward rotation angle of the gripper is limited by the left limiting surface and the left limiting block, and the rightward rotation angle of the gripper is limited by the right limiting surface and the right limiting block.

[0011] Furthermore, the angle of rotation of the gripper is set between 10 and 20°.

[0012] This invention separates the gripper's jaws and arms, assembling them into a rotating sliding pair via a pin. This allows the gripper to clamp the forging with maximum area, thus minimizing clamping indentations. This invention offers advantages such as reasonable design, simple structure, stable gripping, and minimal indentation. Attached Figure Description

[0013] Appendix Figure 1 This is a perspective view of the present invention.

[0014] Appendix Figure 2 For the appendix Figure 1 Main sectional view of the middle gripper.

[0015] Appendix Figure 3 For the appendix Figure 2 Top view,

[0016] Appendix Figure 4 For the appendix Figure 2 Schematic diagram of the cross-section of the middle AA section.

[0017] Appendix Figure 5 This is a schematic diagram of the assembly structure of the gripper and clamp arm.

[0018] In the attached diagram, 1 is the clamp body, 2 is the clamp arm, 201 is the convex arc surface, 3 is the clamp claw, 301 is the concave arc surface, 302 is the left limiting surface, 302' is the right limiting surface, 303 is the pin hole, 4 is the left limiting block, 4' is the right limiting block, and 5 is the pin. Detailed Implementation

[0019] As attached Figure 1 As shown, the clamp arm 2 rotates with the clamp body 1, and the opening and closing of the clamp arm 2 causes the clamp jaws 3 to release or clamp the forging. (See attached diagram) Figure 2 , 4 As shown in Figure 5, the pin shaft 5 passes through the pin shaft holes 303 on both sides of the "U" shape and the corresponding pin shaft holes (not shown in the figure) on the "T" shape. Since the pin shaft hole 303 is a waist-shaped hole, the jaw 2 can slide along the radial direction of the waist-shaped hole while rotating around the pin shaft 5. This ensures that the concave arc surface 301 on the jaw 3 and the convex arc surface 201 on the jaw arm 2 are always in contact, thereby realizing the transfer of the squeezing force of the jaw 2 during the clamping process to the jaw arm 2.

[0020] As attached Figure 2 ,3 As shown in Figure 5, the jaws 2 rotate around the pivot 5, thereby ensuring that the gripping surface on the jaws 2 is always in contact with the forging, achieving the maximum clamping area and the minimum clamping marks.

[0021] As attached Figure 5 As shown, the "T"-shaped structure is provided with a left limiting block 4 and a right limiting block 4'. The leftward rotation position of the jaw 2 is limited by the left limiting surface 302 and the left limiting block 4, and the rightward rotation position of the jaw 2 is limited by the right limiting surface 302' and the right limiting block 4'.

Claims

1. A movable jaw clamp for forging large crank cranks, comprising: Two clamping arms, each equipped with a gripper, the two clamping arms opening and closing, the grippers clamping the crank forging, characterized in that: The clamp arm and gripper are separately configured, and a pin is provided between the clamp arm and gripper, and they are movably connected by the pin; The gripper is configured in a "U" shape, and the end of the clamp arm is configured in a "T" shape. The two sides of the "U" shape and the "T" shape are respectively provided with pin holes. The pin passes through the pin holes, and the "U" shape, the "T" shape and the pin form a rotating pair. The bottom of the "U" shape is provided with a concave arc surface, and the contact part of the "T" shape with the concave arc surface is provided with a convex arc surface. The convex arc surface and the concave arc surface are coupled with each other to bear the pressure of the gripper. The pin hole is an oblong hole, and the pin slides along the major diameter direction of the oblong hole; As the gripper slides along or rotates around the pin, the concave arc surface at the bottom of the "U" shape moves on the convex arc surface of the "T" shape and presses against the convex arc surface of the "T" shape.

2. The movable jaw clamp for forging large cranks according to claim 1, characterized in that: Limiting blocks are provided on the left and right sides of the "T" shape, and left and right limiting surfaces are provided on the two sides of the "U" shape respectively. The leftward rotation angle of the gripper is limited by the left limiting surface and the left limiting block, and the rightward rotation angle of the gripper is limited by the right limiting surface and the right limiting block.

3. The movable jaw clamp for forging large cranks according to claim 2, characterized in that: The angle of rotation of the gripper is set between 10 and 20°.

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