Asymmetric large-stroke tensioning device

Abstract

The utility model relates to an asymmetric large-stroke tensioning device, which comprises a centering seat, an upper piston hole, a lower piston hole and centering chutes, the lower piston hole is positioned below the upper piston hole, and the centering chutes are arranged in an annular array manner; the centering piston is movably arranged in the upper piston hole and provided with pushing sliding grooves which are obliquely formed, and the pushing sliding grooves are formed in an annular array mode and correspond to the centering sliding grooves in a one-to-one mode; the reset piston is movably arranged in the lower piston hole and is connected with the centering piston; the tensioning rod is provided with a pushing sliding block, the tensioning rod is arranged in the centering sliding groove in a sliding mode, and the pushing sliding block is inserted in the pushing sliding groove in a sliding mode; the centering piston is used for driving the reset piston to move towards the top of the centering base, and the pushing sliding groove pushes the tensioning rod to stretch out synchronously. The reset piston is used for driving the centering piston to move towards the bottom of the centering base so that the pushing sliding groove can push the tensioning rod to retract synchronously. According to the asymmetric large-stroke tensioning device, large-stroke centering and tensioning are achieved through the tensioning rod which is eccentrically arranged and can stretch out and draw back, and the asymmetric large-stroke tensioning device is simple in structure and low in cost.

Description

Technical Field

[0001] The utility model relates to a centering tensioning device, in particular to an asymmetric large-stroke tensioning device. Background Art

[0002] Some workpieces need to be positioned and tightened through holes during the machining process. These workpieces usually use a centering and tightening device. The centering and tightening device is inserted into the hole and then tightened on the hole of the workpiece through a tightening block or a tightening sleeve. This can not only achieve the centering of the workpiece, but also achieve the fixation of the workpiece.

[0003] For example, CN 116441583 A discloses a self-centering tensioning mechanism, which uses a centering core shaft to push the inclined wedge blocks arranged in a ring array. The inclined wedge blocks are pushed out by the inclined surface to achieve tensioning. The self-centering tensioning mechanism has a complex structure, high processing cost, and a small tensioning stroke. Utility Model Content

[0004] In order to solve the above problems of complex structure, high processing cost and small tensioning stroke, the utility model provides an asymmetric large-stroke tensioning device, and the specific technical solution is as follows:

[0005] and a lever, having a bottom end portion and a bottom end portion, wherein the pin is located adjacent to the centering member and the pin is pivotally connected to the top of the block, the pin being mounted on the limiter shaft and the limiter having a pivotal position.

[0006] Preferably, the centering seat includes: a centering base provided with a lower piston hole; and a centering middle seat provided on the centering base and provided with an upper piston hole and a centering groove.

[0007] Furthermore, the centering seat also includes: a centering top seat, which is arranged on the centering middle seat and is provided with a top hole matching the centering piston.

[0008] Preferably, at least three positioning planes are provided on the centering piston, the pushing slide grooves are provided on the positioning planes and correspond one-to-one with the positioning planes, and the positioning planes also slide against the tensioning rod.

[0009] Preferably, the end of the tensioning rod is provided with a positioning arc surface.

[0010] Preferably, avoidance arc surfaces are symmetrically provided on both sides of the positioning arc surface.

[0011] Preferably, a connecting shaft is provided at the bottom of the centering seat.

[0012] Preferably, the bottom of the centering seat is provided with a tightening oil circuit respectively communicating with the upper piston hole and a loosening oil circuit respectively communicating with the lower piston hole.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The utility model provides an asymmetric long-stroke tensioning device which realizes long-stroke centering and tensioning through an eccentrically arranged telescopic tensioning rod, has a simple structure, few parts and low processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of this application;

[0016] Figure 2 It is a front view of the present application;

[0017] Figure 3 is a cross-sectional view of the present application;

[0018] Figure 4 This is a schematic diagram of the structure of the present application after the centering seat is hidden;

[0019] Figure 5 yes Figure 4 A top view of

[0020] Figure 6 This is a structural diagram of the centering seat;

[0021] Figure 7 It is a structural diagram of the centering piston;

[0022] Figure 8 It is a three-dimensional diagram of the tension rod from a first perspective;

[0023] Figure 9 is a stereoscopic diagram of the tension rod from a second perspective;

[0024] Figure 10 It is the front view of the tension rod. DETAILED DESCRIPTION

[0025] The present invention will now be further described with reference to the accompanying drawings.

[0026] like Figures 1 to 10 As shown, an asymmetric long-stroke tensioner includes a centering seat 1, a centering piston 2, a return piston 4, and a tensioning rod 3. The centering seat 1 is provided with a centering groove 17, an upper piston hole 161, and a lower piston hole 162, sequentially from top to bottom. Three centering grooves 17 are arranged in a circular array. The centering groove 17 communicates with the upper piston hole 161, which in turn communicates with the lower piston hole 162. The lower piston hole 162 is located at the bottom of the centering seat 1. The centering seat 1 is also provided with a tensioning oil circuit 151 and a release oil circuit 152, which communicate with the upper piston hole 161 and the lower piston hole 162, respectively. One end of the tensioning oil circuit 151 communicates with the bottom of the upper piston hole 161, and the other end is located at the bottom or side of the centering seat 1. One end of the release oil circuit 152 communicates with the top of the lower piston hole 162, and the other end is located at the bottom or side of the centering seat 1. The centering piston 2 is movably mounted within the upper piston hole 161. Three push grooves 23 are arranged in an annular array on the centering piston 2, and the push grooves 23 are arranged at an angle. The reset piston 4 is movably mounted within the lower piston hole 162, with the top of the reset piston 4 connected to the bottom of the centering piston 2. Three tensioning rods 3 are provided, with each tensioning rod 3, centering groove 17, and push groove 23 corresponding to each other. A push slider 31 is provided on the tensioning rod 3, which slides within the centering groove 17. The push slider 31 slides and inserts into the push groove 23. The push slider 31 matches the push groove 23, forming an inclined push structure. The three tensioning rods 3 are arranged in an annular array.

[0027] During centering and tightening, oil flows into the tightening oil passage 151, causing the centering piston 2 to move toward the top of the centering seat 1. Simultaneously, this piston drives the return piston 4 toward the top of the centering seat 1. As the centering piston 2 rises, the inclined push chute 23 moves upward. This push chute 23 pushes the tensioning rods 3 horizontally through the push slider 31, and the three tensioning rods 3 extend synchronously, achieving centering. When the tensioning rods 3 contact the hole in the workpiece, they center and clamp the workpiece.

[0028] When the workpiece is loosened, oil is released into the oil circuit 152, the reset piston 4 moves downward, and the reset piston 4 drives the centering piston 2 to descend. When the centering piston 2 descends, the inclined push chute 23 moves downward, and the push chute 23 pushes the tensioning rod 3 to retract by pushing the slider 31. The three tensioning rods 3 retract synchronously to loosen the workpiece.

[0029] Since the tensioning rod 3 is eccentrically arranged, the length that can be extended is much greater than the radially arranged inclined wedge block, thereby achieving a large-stroke tensioning, solving the problem of the short tensioning distance of the inclined wedge block.

[0030] The asymmetric long-stroke tensioning device has fewer parts and a simple structure, thereby greatly reducing processing costs.

[0031] To facilitate processing and reduce costs, the centering seat 1 includes a centering base 12 and a centering center 11. A lower piston hole 162 is provided at the bottom of the centering base 12, and the top of the centering base 12 is connected to the bottom of the centering center 11. An upper piston hole 161 is provided at the bottom of the centering center 11. The upper piston hole 161 and the lower piston hole 162 are coaxially arranged and communicate with each other. A centering chute 17 is provided at the top of the centering center 11 and communicates with the upper piston hole 161.

[0032] In order to further facilitate the processing of the centering groove 17, the centering seat 1 also includes a centering top seat 13, which is installed on the top of the centering seat 11 by screws. The bottom of the centering top seat 13 is provided with a top hole 131, and the top hole 131 matches the centering piston 2. When the centering piston 2 rises, it is convenient to insert the top of the centering piston 2, so that the centering piston 2 has space to move.

[0033] To facilitate the machining of the push chute 23 and improve the positioning of the tensioning rod 3, three positioning flats 24 are provided in an annular array on the centering piston 2. The push chute 23 is located on the positioning flats 24, which also slide against the tensioning rod 3. The positioning flats 24 and the centering chute 17 achieve positioning of the tensioning rod 3 in the direction of extension and retraction, ensuring stable extension and retraction of the tensioning rod 3.

[0034] In order to facilitate centering and improve the centering accuracy, the end of the tension rod 3 is provided with a positioning arc surface 32. The positioning arc surface 32 can reduce the contact area with the inner circular surface of the hole, thereby improving the positioning accuracy.

[0035] In order to further improve the centering accuracy, avoidance arc surfaces 33 are symmetrically provided on both sides of the positioning arc surface 32. The avoidance arc surfaces 33 can further reduce interference and avoid contact between the two sides of the end of the tensioning rod 3 and the hole of the workpiece, thereby improving the positioning accuracy.

[0036] In order to facilitate installation on the hydraulic clamp, a connecting shaft 121 is provided at the bottom of the centering seat 1. The connecting shaft 121 is used to be installed in the hollow of the hydraulic clamp and a sealed connection is achieved through a sealing ring. At this time, one end of the tightening oil circuit 151 and the loosening oil circuit 152 are both located at the bottom of the centering seat 1 and can be communicated with the oil circuit on the hydraulic clamp.

[0037] The tensioning rod 3 is not arranged in the center, but on one side, forming an eccentric structure. The diameter of the centering piston 2 is fully utilized to achieve a large stroke movement of the tensioning rod 3. The stroke is doubled compared to the inclined wedge block, which is suitable for occasions with large aperture drop and compact space design.

[0038] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will be able to devise other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the claims of the present invention.

Claims

1. An asymmetric long-stroke tensioning device, characterized in that: include: A centering seat (1) is provided with an upper piston hole (161), a lower piston hole (162) located below the upper piston hole (161), and at least three centering slots (17), wherein the centering slots (17) are arranged in a ring array; A centering piston (2) is movably disposed in the upper piston hole (161) and is provided with at least three inclined push chutes (23), wherein the push chutes (23) are arranged in a ring array and correspond one to one with the centering chutes (17); a reset piston (4), movably disposed in the lower piston hole (162) and connected to the centering piston (2); and The tensioning rod (3) is provided with a pushing slider (31), the tensioning rod (3) is slidably arranged in the centering slide groove (17), and the pushing slider (31) is slidably inserted in the pushing slide groove (23); The centering piston (2) is used to drive the reset piston (4) to move toward the top of the centering seat (1), and to enable the pushing chute (23) to push the tensioning rod (3) to extend synchronously and press on the hole of the workpiece; the reset piston (4) is used to drive the centering piston (2) to move toward the bottom of the centering seat (1), so that the pushing chute (23) pushes the tensioning rod (3) to retract synchronously.

2. The asymmetric long-stroke tensioning device according to claim 1, characterized in that: The centering seat (1) comprises: A centering base (12) is provided with a lower piston hole (162); and The centering seat (11) is arranged on the centering base (12) and is provided with an upper piston hole (161) and a centering slide groove (17).

3. The asymmetric long-stroke tensioning device according to claim 2, characterized in that: The centering seat (1) further comprises: a centering top seat (13), which is arranged on the centering middle seat (11) and is provided with a top hole (131) that matches the centering piston (2).

4. The asymmetric long-stroke tensioner according to claim 1, characterized in that: The centering piston (2) is also provided with at least three positioning planes (24), the pushing slide grooves (23) are provided on the positioning planes (24) and correspond one to one with the positioning planes (24), and the positioning planes (24) also slide against the tensioning rod (3).

5. An asymmetric long-stroke tensioner according to any one of claims 1 to 4, characterized in that: The end of the tensioning rod (3) is provided with a positioning arc surface (32).

6. The asymmetric long-stroke tensioner according to claim 5, characterized in that: Avoidance arc surfaces (33) are symmetrically provided on both sides of the positioning arc surface (32).

7. An asymmetric long-stroke tensioner according to any one of claims 1 to 4, characterized in that: A connecting shaft (121) is provided at the bottom of the centering seat (1).

8. An asymmetric long-stroke tensioner according to any one of claims 1 to 4, characterized in that: The bottom of the centering seat (1) is provided with a tightening oil path (151) communicating with the upper piston hole (161) and a loosening oil path (152) communicating with the lower piston hole (162).

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