Ultra-short axial stroke claw end face pressing device

Abstract

This utility model provides an ultra-short axial stroke pull claw end face clamping device, relating to the field of machine tool fixtures. It includes a fixture body, a spherical pull rod head, and multiple pull claws. The spherical pull rod head is slidably fixed to the fixture body. The movement direction of the spherical pull rod head relative to the fixture body is horizontal. The pull claws include a cylindrical pin, a pull claw rod, a ball-head pin, and a spring. The cylindrical pin is fixed to the spherical pull rod head. The pull claw rod is rotatably fixed to the fixture body via a bearing. A helical hole is provided on the side wall of the pull claw rod. The cylindrical pin is inserted into the helical hole and is slidably fixed within the helical hole. A limiting hole is provided at the end of the pull claw rod. The ball-head pin is fixed within the limiting hole via a spring. The spherical surface of the ball-head pin faces outward and presses against the fixture body. The ultra-short axial stroke pull claw end face clamping device provided by this utility model solves the problem in the prior art where clamping devices are difficult to clamp workpieces when axial space is limited, facilitating workpiece clamping operations when axial space is limited.

Description

Technical Field

[0001] This utility model relates to the field of machine tool fixtures, and in particular to an ultra-short axial stroke puller end face clamping device. Background Technology

[0002] In the fields of machining and tooling fixtures, clamping the workpiece at its end face is a common method to ensure machining stability.

[0003] In the prior art, such as the brush end cap pull claw clamping device disclosed in Chinese patent application number 201420729933.X, the structure and working principle of a pull claw clamping device are described.

[0004] However, in some applications with limited axial space, such as when the axial space reserved at the workpiece mounting station is extremely small and cannot accommodate the long stroke of traditional clamps or the additional space required for clamping and flipping, traditional clamping cannot provide sufficient space for clamping operations due to the large axial stroke required. Utility Model Content

[0005] To address the aforementioned technical problems, the ultra-short axial stroke puller end face clamping device provided by this utility model can facilitate the clamping operation of workpieces when axial space is limited.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides an ultra-short axial stroke pull claw end face clamping device, including a clamp body, a spherical pull rod head, and multiple pull claws; the spherical pull rod head is slidably fixed to the clamp body; the movement direction of the spherical pull rod head relative to the clamp body is horizontal; each pull claw includes a cylindrical pin, a pull claw rod, a pull claw stop, a bearing, a ball head pin, and a spring; the cylindrical pin is fixed to the spherical pull rod head; the pull claw rod is slidably fixed to the inner ring of the bearing; the outer ring of the bearing is fixed to the clamp body; the axial direction of the bearing is parallel to the movement direction of the spherical pull rod head. The pull claw rod has a helical hole on its side wall; a cylindrical pin is inserted into the helical hole; the cylindrical pin is slidably fixed in the helical hole; when the cylindrical pin moves along the helical hole, the pull claw rod can rotate relative to the axis of the bearing; a limit hole is opened in the horizontal direction of the pull claw rod; a ball head pin is fixed in the limit hole by the spring; the spherical surface of the ball head pin is set outward; the spherical surface of the ball head pin is kept pressed against the clamp body; a pull claw stop is fixed on the pull claw rod; the pull claw stop is fixed at the end facing away from the ball head pin.

[0007] The ultra-short axial stroke pull claw end face clamping device provided by this utility model preferably further includes a bushing; the bushing is fixed on the clamp body; the bushing includes a sliding hole; the sliding hole extends horizontally; the outer wall of the pull claw rod is adapted to the sliding hole; the pull claw rod can slide horizontally relative to the sliding hole; the pull claw rod can rotate within the sliding hole along the axis of the bearing.

[0008] The ultra-short axial stroke pull claw end face clamping device provided by this utility model preferably has three pull claws.

[0009] The ultra-short axial stroke pull claw end face clamping device provided by this utility model preferably further includes an elastic retaining ring; one end of the pull claw rod with the limiting hole is a small-diameter shaft section; the diameter of the small-diameter shaft section is smaller than the diameter of the pull claw rod body; a radial stepped end face is formed between the small-diameter shaft section and the pull claw rod body; the bearing is sleeved on the small-diameter shaft section; an annular hole is formed on the small-diameter shaft section; the elastic retaining ring is fixed in the annular hole; the elastic retaining ring and the stepped end face respectively abut against the two bottom surfaces of the bearing.

[0010] The above technical solution has the following advantages or beneficial effects: This utility model provides an ultra-short axial stroke pull claw end face clamping device, relating to the field of machine tool fixtures, including a fixture body, a spherical pull rod head, and multiple pull claws; the spherical pull rod head is slidably fixed to the fixture body; the movement direction of the spherical pull rod head relative to the fixture body is horizontal; each pull claw includes a cylindrical pin, a pull claw rod, a pull claw stop, a bearing, a ball head pin, and a spring; the cylindrical pin is fixed to the spherical pull rod head; the pull claw rod is slidably fixed to the inner ring of the bearing; the outer ring of the bearing is fixed to the fixture body; the axial direction of the bearing is parallel to the spherical pull rod. The head moves in a specific direction; a helical hole is provided on the side wall of the pull claw rod; a cylindrical pin is inserted into the helical hole; the cylindrical pin is slidably fixed in the helical hole; when the cylindrical pin moves along the helical hole, the pull claw rod can rotate relative to the axis of the bearing; a limit hole is provided in the horizontal direction of the pull claw rod; a ball head pin is fixed in the limit hole by the spring; the spherical surface of the ball head pin faces outward; the spherical surface of the ball head pin is kept pressed against the clamp body; a pull claw stop is fixed on the pull claw rod; the pull claw stop is fixed at the end facing away from the ball head pin. The ultra-short axial stroke pull claw end face clamping device provided by this utility model solves the problem in the prior art that it is difficult to clamp the workpiece when the axial space is small, and can facilitate the clamping operation of the workpiece when the axial space is limited. Attached Figure Description

[0011] The present invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not intentionally drawn to scale; the focus is on illustrating the gist of the invention.

[0012] Figure 1 This is a schematic cross-sectional view of the ultra-short axial stroke puller end face clamping device provided in Embodiment 1 of this utility model.

[0013] Figure 2 This is a cross-sectional structural schematic diagram showing the positional relationship between the cylindrical pin and the spiral hole of the ultra-short axial stroke pull claw end face clamping device provided in Embodiment 1 of this utility model.

[0014] Figure 3 This is a cross-sectional structural diagram showing the bearing fixing relationship of the ultra-short axial stroke pull claw end face clamping device provided in Embodiment 1 of this utility model. Detailed Implementation

[0015] Example 1: The ultra-short axial stroke puller end face clamping device provided in Embodiment 1 of this utility model, such as Figures 1 to 3 As shown, the fixture includes a clamp body 1, a spherical pull rod head 2, and three pull claws 3. The spherical pull rod head 2 is slidably fixed to the clamp body 1. The spherical pull rod head 2 moves horizontally relative to the clamp body 1. The pull claws 3 include a cylindrical pin 31, a pull claw rod 32, a pull claw stop 33, a bearing 34, a ball pin 35, and a spring 36. The cylindrical pin 31 is fixed to the spherical pull rod head 2. The pull claw rod 32 is slidably fixed to the inner ring of the bearing 34. The outer ring of the bearing 34 is fixed to the clamp body 1. The axis of the bearing 34 is parallel to the moving direction of the spherical pull rod head 2. A helical hole is provided on the side wall of the pull claw rod 32. 321; The cylindrical pin 31 is inserted into the spiral hole 321; The cylindrical pin 31 is slidably fixed in the spiral hole 321; When the cylindrical pin 31 moves along the spiral hole 321, the pull claw rod 32 can rotate relative to the axis of the bearing 34; The pull claw rod 32 has a limit hole 322 in the horizontal direction; The ball head pin 35 is fixed in the limit hole 322 by the spring 36; The spherical surface of the ball head pin 35 is set outward; The spherical surface of the ball head pin 35 is kept pressed against the clamp body 1; The pull claw stop block 33 is fixed on the pull claw rod 32; The pull claw stop block 33 is fixed at the end of (the pull claw rod 32) facing away from the ball head pin 35.

[0016] The ultra-short axial stroke pull claw end face clamping device provided in Embodiment 1 of this utility model requires two operations during operation: clamping and releasing the workpiece. When clamping the workpiece, the spherical pull rod head 2 moves to the left relative to the clamp body 1, driving the cylindrical pin 31 to move to the left (the workpiece is fixed on the right side). Since the cylindrical pin 31 is inserted into the spiral hole 321 of the pull claw rod 32, and the pull claw rod 32 is slidably fixed by the inner ring of the bearing 34 (the outer ring of the bearing 34 is fixed on the clamp body 1, and the axis is parallel to the moving direction of the spherical pull rod head), the horizontal movement of the cylindrical pin 31 will slide along the spiral trajectory of the spiral hole 321, forcing the pull claw rod 32 to rotate around the axis of the bearing 34. At this time, under the elastic force of the spring 36, the ball head pin 35 on the pull claw rod 32 always presses against the clamp body 1, and the force of the spring 36 can balance the cylindrical pin and the... The frictional resistance between the spiral holes ensures that the pull claw rod 32 prioritizes rotation rather than direct axial movement, causing the pull claw stop 33 fixed at the end of the pull claw rod 32 to rotate to the end face of the workpiece to be clamped. When the cylindrical pin 31 moves along the spiral hole 321 to the end of the hole, the pull claw rod 32 can no longer rotate. At this time, the spherical pull rod head 2 continues to move horizontally, causing the pull claw rod 32 to slide relative to the inner ring of the bearing 34 along the axial direction of the bearing 34. The pull claw stop 33 moves axially synchronously with the pull claw rod 32. Finally, the three pull claw stops 33 simultaneously press against the end face of the workpiece, pressing the workpiece toward the direction of the fixture body 1 (the right side of the fixture body 1 is fixed with a workpiece positioning disk 02 that adapts to the shape of the workpiece 01, and the three pull claw stops 33 press the workpiece 01 toward the left, and the workpiece 01 is pressed against the workpiece positioning disk 02 to achieve fixation), thus completing the clamping. When releasing the workpiece, the spherical pull rod head 2 slides to the right relative to the fixture body 1, and the cylindrical pin 31 moves to the right synchronously with it. The cylindrical pin 31 slides in the opposite direction in the spiral hole 321. Under the action of the restoring force of the spring 36 or the pulling force of the spherical pull rod head, the pull claw rod 32 first moves horizontally in the opposite direction along the axis of the bearing 34, and the pull claw stop 33 disengages from the end face of the workpiece. When the cylindrical pin 31 continues to move in the opposite direction to the reverse end of the spiral hole 321, the pull claw rod 32 rotates in the opposite direction around the axis of the bearing 34 under the drive of the cylindrical pin 31. The pull claw stop 33 rotates with it to a position that does not obstruct the removal of the workpiece. At this time, the workpiece can be removed smoothly, and the release is completed.Compared to existing technologies that typically require the puller block 33 to move inward to create sufficient space before a workpiece can be placed, this embodiment provides space for workpiece placement by rotating the puller block 33. Therefore, the axial travel of the puller block 33 is shorter, making it suitable for scenarios with limited axial clearance at the installation station. Compared to existing fixtures that allow manual rotation of the puller block 33, this embodiment achieves automatic rotation of the puller block 33, avoiding manual operation (in areas with limited axial space). Compared to existing devices that automatically rotate and pull the puller block 33 to compress the workpiece, this embodiment achieves both rotating the puller block 33 and pressing the workpiece using the puller block 33 by horizontally moving the spherical pull rod head 2, eliminating the need for rotating the puller block 33 and reducing the device size. This frees up more space on the right side for workpiece clamping, making this embodiment more suitable for scenarios with limited axial clearance at the workpiece installation station.

[0017] The ultra-short axial stroke puller end face clamping device provided in Embodiment 1 of this utility model solves the problem in the prior art that it is difficult to clamp the workpiece when the axial space is small, and can facilitate the clamping operation of the workpiece when the axial space is limited.

[0018] In this embodiment, a bushing 4 is also included; the bushing 4 is fixed on the clamp body 1; the bushing 4 includes a sliding hole 41; the sliding hole 41 extends horizontally; the outer wall of the pull claw rod 32 is adapted to the sliding hole 41; the pull claw rod 32 can slide horizontally relative to the sliding hole 41; the pull claw rod 32 can rotate within the sliding hole 41 along the axis of the bearing 34. The pull claw rod 32 needs to slide horizontally along the axial direction of the bearing 34 axis to achieve a small stroke for clamping and loosening. The pull claw rod 32 also needs to rotate around this axis to adjust the posture of the pull claw stop. If only the inner ring of the bearing 34 is supported, slight radial wobbling may occur, causing the fit between the helical hole 321 and the cylindrical pin 31 to deviate, resulting in jamming. The sliding hole 41 of the bushing 4 is adapted to the outer wall of the pull claw rod 32, which is equivalent to adding a radial constraint at the middle position of the pull claw rod, forming a two-point support with the bearing 34, thereby limiting the radial displacement of the pull claw rod and ensuring that the movement of the pull claw rod 32 always revolves around the axis of the bearing 34.

[0019] In this embodiment, an elastic retaining ring 5 is also included; one end of the pull claw rod 32 with a limiting hole 322 is a small-diameter shaft section; the diameter of the small-diameter shaft section is smaller than the diameter of the pull claw rod body; a radial stepped end face is formed between the small-diameter shaft section and the pull claw rod body; a bearing 34 is sleeved on the small-diameter shaft section; an annular hole 323 is formed on the outside of the small-diameter shaft section; the elastic retaining ring 5 is fixed in the annular hole 323; the elastic retaining ring 5 and the stepped end face respectively abut against the bottom surfaces of both sides of the bearing 34. The small-diameter shaft section of the pull claw rod 32 is designed to form a radial stepped end face with the body, and the stepped end face constitutes the right limit of the bearing 34; while the elastic retaining ring 5 is inserted into the annular hole 323 of the small-diameter shaft section, and the part of it extending out of the annular hole constitutes the left limit of the bearing 34. The two cooperate to fix the bearing 34 in the middle, strictly limiting the axial displacement of the bearing 34 along the pull claw rod. This avoids the displacement of the bearing 34 causing the rotation axis of the pull claw rod 32 to shift, and causing misalignment between the helical hole 321 and the cylindrical pin 31.

[0020] In summary, this utility model provides an ultra-short axial stroke puller end face clamping device, relating to the field of machine tool fixtures, including a fixture body, a spherical pull rod head, and multiple pullers; the spherical pull rod head is slidably fixed to the fixture body; the movement direction of the spherical pull rod head relative to the fixture body is horizontal; each puller includes a cylindrical pin, a puller rod, a puller stop, a bearing, a ball head pin, and a spring; the cylindrical pin is fixed to the spherical pull rod head; the puller rod is slidably fixed to the inner ring of the bearing; the outer ring of the bearing is fixed to the fixture body; the axial direction of the bearing is parallel to the spherical surface. The pull rod head has a moving direction; a helical hole is provided on the side wall of the pull claw rod; the cylindrical pin is inserted into the helical hole; the cylindrical pin is slidably fixed in the helical hole; when the cylindrical pin moves along the helical hole, the pull claw rod can rotate relative to the axis of the bearing; a limit hole is provided in the horizontal direction of the pull claw rod; the ball head pin is fixed in the limit hole by the spring; the spherical surface of the ball head pin is set outward; the spherical surface of the ball head pin is kept pressed against the clamp body; the pull claw stop is fixed on the pull claw rod; the pull claw stop is fixed at the end facing away from the ball head pin. The ultra-short axial stroke pull claw end face clamping device provided by this utility model solves the problem in the prior art that it is difficult to clamp the workpiece when the axial space is small, and can facilitate the clamping operation of the workpiece when the axial space is limited.

[0021] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A clamping device for the end face of an ultra-short axial stroke puller, characterized in that, Includes the clamp body, spherical pull rod head, and multiple pull claws; The spherical pull rod head is slidably fixed to the clamp body; the direction of movement of the spherical pull rod head relative to the clamp body is horizontal; The pull claw includes a cylindrical pin, a pull claw rod, a pull claw stop, a bearing, a ball head pin, and a spring; The cylindrical pin is fixed to the spherical tie rod head; The pull claw rod is slidably fixed to the inner ring of the bearing; the outer ring of the bearing is fixed to the clamp body; the axial direction of the bearing is parallel to the moving direction of the spherical pull rod head; The pull claw rod has a helical hole on its side wall; the cylindrical pin is inserted into the helical hole; the cylindrical pin is slidably fixed in the helical hole; when the cylindrical pin moves along the helical hole, the pull claw rod can rotate relative to the axis of the bearing. The pull claw rod has a limiting hole in the horizontal direction; the ball pin is fixed in the limiting hole by the spring; the spherical surface of the ball pin is set outward; the spherical surface of the ball pin is kept pressed against the clamp body; The pull claw stop is fixed to the pull claw rod; the pull claw stop is fixed to the end facing away from the ball head pin.

2. The ultra-short axial stroke puller end face clamping device as described in claim 1, characterized in that, It also includes a bushing; the bushing is fixed to the clamp body; the bushing includes a sliding hole; the sliding hole extends horizontally; the outer wall of the pull claw rod is adapted to the sliding hole; the pull claw rod can slide horizontally relative to the sliding hole; The pull claw can rotate within the sliding hole along the axis of the bearing.

3. The ultra-short axial stroke puller end face clamping device as described in claim 1, characterized in that, There are three pull claws.

4. The ultra-short axial stroke puller end face clamping device as described in claim 1, characterized in that, It also includes a flexible retaining ring; The end of the pull claw rod with the limiting hole is a small-diameter shaft section; the diameter of the small-diameter shaft section is smaller than the diameter of the pull claw rod body; a radial stepped end face is formed between the small-diameter shaft section and the pull claw rod body; the bearing is sleeved on the small-diameter shaft section; an annular hole is formed on the outside of the small-diameter shaft section; The elastic retaining ring is fixed inside the annular hole; the elastic retaining ring and the stepped end face are respectively attached to the bottom surfaces of the two sides of the bearing.

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