Manual three-jaw linkage balance clamping structure

Abstract

The utility model relates to a manual three-jaw linkage balance clamping structure which comprises a vertically-fixed limiting plate, the front side of the limiting plate is fixedly connected with a limiting seat, the back side of the limiting plate is provided with a jaw disc, three sets of protruding handles are fixedly arranged on the periphery of the jaw disc at intervals, clamping jaws are hinged to the ends of the protruding handles, and the clamping jaws are fixedly connected with the limiting seat. The clamping jaws penetrate to the front side of the limiting plate, the ends of the clamping jaws are in a hook shape so that a workpiece can be fixedly clamped to the limiting base, a threaded hole is formed in the center of the jaw disc in a penetrating mode and is in threaded connection with the screw, and the end of the screw is rotationally connected with the limiting plate. The manual three-jaw linkage balanced clamping structure comprises a limiting plate, the limiting plate is provided with receding grooves allowing the three sets of clamping jaws to penetrate out, the clamping jaws are rotationally connected with the limiting plate in the receding grooves through penetrating of guide pins, the clamping jaws are all provided with inclined grooves matched with the guide pins so that the clamping jaws can stretch outwards or clamp inwards, and the manual three-jaw linkage balanced clamping structure is stable in clamping, convenient, fast and efficient.

Description

Technical Field

[0001] The utility model relates to a manual three-jaw linkage balanced clamping structure. Background Art

[0002] In workpiece production, clamping of the workpiece is a prerequisite for further processing of the workpiece, and whether the clamping is stable is an important prerequisite for determining the yield rate of the workpiece. Since the workpiece (tubular) requires at least three clamping points for the clamping positioning plane to form a stable plane, most small workpieces are designed with three clamping points according to general design, and there are the following disadvantages: 1. The clamping time is long; 2. The fixture size is large, and sometimes the processing interference is caused due to the too large fixture. In view of this, the purpose of this application is to design a structure that can be applied to workpieces with limited fixture space and the smallest type of products and reduce the operation time of clamping. Summary of the Utility Model

[0003] In view of the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a manual three-jaw linkage balanced clamping structure, which is not only reasonable in structure, but also efficient and stable.

[0004] To solve the above technical problem, the technical solution of the utility model is: a manual three-jaw linkage balanced clamping structure, including a vertically fixed limiting plate, a limiting seat is fixedly connected to the front side of the limiting plate, a claw disc is arranged on the back side of the limiting plate, three groups of convex handles are fixedly arranged at intervals along the outer periphery of the claw disc, the ends of the convex handles are all hinged with clamping claws, the clamping claws all penetrate to the front side of the limiting plate and are hooked at the ends to clamp the workpiece on the limiting seat, a threaded hole is formed through the center of the claw disc and is screwed with a screw rod, the end of the screw rod is rotatably connected with the limiting plate; a relief groove for the three groups of clamping claws to pass through is formed on the limiting plate, and the clamping claws are rotatably connected with the limiting plate through a guide pin in the relief groove, and inclined grooves for matching with the guide pin are formed on the clamping claws to facilitate the outward extension or inward clamping action of the clamping claws.

[0005] Further, a sliding seat rotatably connected with the end of the screw rod is fixedly arranged on the back side of the limiting plate, a sliding groove is formed in the sliding seat from top to bottom, and the end of the screw rod is restricted in the axial degree of freedom in the sliding groove but is vertically slidably connected with the limiting plate.

[0006] Further, a stepped groove for restricting the workpiece is formed on the front side of the limiting seat, and clamping grooves for clamping the workpiece are correspondingly formed on the front side of the limiting seat at the positions of the clamping claws.

[0007] Further, an arc-shaped support rod for extending into the workpiece for support is fixedly connected to the bottom of the stepped groove, and an arc-shaped top rod for facilitating abutting against the inner wall of the workpiece is vertically fixedly connected to the end of the arc-shaped support rod.

[0008] Further, the sizes of the relief grooves are all larger than the sizes of the clamping claws to allow the clamping claws to adaptively displace, and the included angles between adjacent convex handles are all the same.

[0009] Furthermore, the lower end of the limit plate is fixedly connected to a bottom plate, and the lower end of the bottom plate is fixedly connected to a base. The base on the positive side of the limit plate is fixedly provided with a plurality of clamping parts arranged around the periphery of the workpiece.

[0010] Furthermore, the clamping member includes a column vertically fixedly connected to the base, and the top of each column is provided with a screw hole toward the center of the base and is threaded through by a positioning screw to be connected to the outer periphery of the workpiece.

[0011] Furthermore, the clamping members are provided in three groups and are distributed in a triangular shape on the outer peripheral side of the workpiece, and connecting rods are fixedly connected between the three groups of pillars.

[0012] Furthermore, the other end of the screw rod is fixedly connected with a turning handle.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the inclined groove facilitates the outward extension or inward clamping action of the clamping jaws, is suitable for workpieces of different sizes and ensures stable rear end positioning of the workpiece, and cooperates with the multi-point clamping at the front end to ensure efficient and stable clamping.

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0016] Figure 2 It is a top view schematic diagram of an embodiment of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the embodiment of the utility model after removing the workpiece;

[0018] Figure 4 This is a schematic diagram of the connection between the claw plate and the clamping claw in the embodiment of the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the limit seat in the embodiment of the utility model;

[0020] Figure 6 It is a schematic diagram of the structure of the limiting plate in the embodiment of the utility model.

[0021] In the figure: 1-limiting plate, 2-limiting seat, 3-claw plate, 4-convex handle, 5-clamping claw, 6-workpiece, 7-threaded hole, 8-screw, 9-allowing groove, 10-guide pin, 11-oblique groove, 12-slide seat, 13-slide groove, 14-step groove, 15-clamping groove, 16-arc support rod, 17-arc top rod, 18-bottom plate, 19-base, 20-clamping fixture, 21-pillar, 22-screw hole, 23-positioning screw, 24-connecting rod, 25-turning handle. Detailed implementation mode

[0022] To make the above features and advantages of the present utility model more obvious and understandable, specific embodiments are given below. Taking a tubular casting as an example of the workpiece and in conjunction with the accompanying drawings, the detailed description is as follows.

[0023] As Figures 1-6 shown, the manual three-jaw linkage balanced clamping structure includes a vertically fixed limit plate 1. A limit seat 2 is fixedly connected to the front side of the limit plate. A jaw plate 3 is arranged in parallel on the back side of the limit plate. Three convex handles 4 are fixedly arranged at intervals along the outer circumference of the jaw plate. The ends of the convex handles are all hinged with clamping jaws 5. The clamping jaws all extend to the front side of the limit plate and are hooked at the ends to clamp the workpiece 6 on the limit seat. A threaded hole 7 is axially penetrated through the center of the jaw plate and is screwed with a screw rod 8. The end of the screw rod is rotatably connected to the limit plate. A relief groove 9 for the three clamping jaws to pass through is opened on the limit plate. The clamping jaws are rotatably connected to the limit plate through a guide pin 10 in the relief groove. Oblique grooves 11 for cooperating with the guide pin are opened on the clamping jaws to facilitate the outward stretching or inward clamping action of the clamping jaws. The oblique grooves are all in the shape of obliquely extending strip-shaped holes, and the oblique extending directions are all obliquely inward from back to front. That is, after the screw rod is rotated forward, the jaw plate moves backward, driving the clamping jaws to move backward. At the same time, the front ends gradually approach the middle under the action of the oblique grooves and finally clamp on the workpiece through the clamping grooves. When it is necessary to loosen the workpiece, the screw rod is rotated reversely, and the jaw plate moves forward to drive the clamping jaws to move forward. During the forward movement of the clamping jaws, the front ends open under the guidance of the oblique grooves to accommodate the installation of the replaced workpiece.

[0024] In the embodiment of the present utility model, a sliding seat 12 rotatably connected to the end of the screw rod is fixedly arranged on the back side of the limit plate. A convex-shaped sliding groove 13 is opened on the top of the sliding seat from top to bottom. The end of the screw rod is restricted in the axial degree of freedom in the sliding groove but is vertically slidably connected to the limit plate. That is, the end of the screw rod can be connected with a bearing, and the bearing end slides into the convex-shaped sliding groove from top to bottom to axially limit the screw rod, and the screw rod is rotatably connected to the sliding seat and vertically slides within a certain range.

[0025] In the embodiment of the present utility model, a stepped groove 14 for restricting the workpiece is opened on the front side of the limit seat. Clamping grooves 15 for clamping the workpiece are correspondingly opened on the front side of the limit seat at the positions of the clamping jaws.

[0026] In the embodiment of the present utility model, an arc-shaped support rod 16 for extending into the workpiece for support is fixedly connected to the bottom of the stepped groove. An arc-shaped top rod 17 for facilitating the abutment against the inner wall of the workpiece is vertically fixedly connected to the end of the arc-shaped support rod.

[0027] In the embodiment of the present utility model, the sizes of the relief grooves are all larger than the sizes of the clamping jaws to allow the clamping jaws to adaptively change positions, and the angles between adjacent convex handles are all the same.

[0028] In the embodiment of the present utility model, a bottom plate 18 is fixedly connected to the lower end of the limit plate, the lower end of the bottom plate is fixedly connected to a base 19, and a plurality of clamping members 20 surrounding the workpiece are fixedly provided on the base on the front side of the limit plate.

[0029] In the embodiment of the present utility model, the clamping member includes a support column 21 vertically fixedly connected to the base. A screw hole 22 is provided at the top of each support column facing the center of the base, and each support column is screwed through by a positioning screw 23 to abut against the outer periphery of the workpiece.

[0030] In the embodiment of the present utility model, three groups of clamping members are provided and are distributed in a triangular shape on the outer peripheral side of the workpiece. A connecting rod 24 is fixedly connected between the three groups of support columns.

[0031] In the embodiment of the present utility model, the other end of the screw is fixedly connected with a turning handle 25, and the outer end of the positioning screw is also fixedly connected with a turning handle.

[0032] The working principle of the embodiment of the present utility model is as follows: First, the tubular workpiece is sleeved into the arc-shaped support rod and abuts against the stepped groove at the rear end. Then, after the screw is rotated forward, the claw disc moves backward, driving the claw to move backward. At the same time, the front end gradually approaches the middle under the action of the inclined groove and finally clamps the workpiece through the clamping groove, completing the clamping of the rear end of the workpiece. Then, the positioning screw is rotated to make it approach the workpiece and abut against the outer peripheral side of the workpiece. At this time, the arc-shaped ejector rod also abuts against the inner wall of the workpiece, completing the clamping of the front end of the workpiece, and then the further processing of the workpiece can be carried out; when the workpiece needs to be loosened, the screw is rotated reversely, and the claw disc moves forward to drive the claw to move forward. During the forward movement of the claw, the front end opens under the guidance of the inclined groove to ensure the installation space for the next workpiece.

[0033] The present utility model is not limited to the above-mentioned best embodiment, and anyone can obtain other various forms of manual three-jaw linkage balanced clamping structures under the inspiration of the present utility model. All equal changes and modifications made according to the scope of the patent application of the present utility model shall fall within the scope covered by the present utility model.

Claims

1. Manual three-jaw linkage balanced clamping structure, characterized by: It includes a vertically fixed limit plate, the front side of the limit plate is fixedly connected to the limit seat, the back side of the limit plate is provided with a claw plate, the claw plate is fixedly provided with three groups of protruding handles at intervals along the outer circumference thereof, the ends of the protruding handles are hinged with clamping jaws, the clamping jaws are all penetrated to the front side of the limit plate and are hooked at the ends to clamp the workpiece on the limit seat, a threaded hole is penetrated through the center of the claw plate and is screwed with a screw, and the end of the screw is rotatably connected to the limit plate; the limit plate is provided with clearance grooves for the three groups of clamping jaws to pass through respectively, the clamping jaws are penetrated in the clearance grooves through guide pins and are rotatably connected to the limit plate, and the clamping jaws are provided with oblique grooves matching the guide pins to facilitate the clamping jaws to extend outward or clamp inward.

2. The manual three-jaw linkage balanced clamping structure according to claim 1 is characterized in that: A slide seat rotatably connected to the end of the screw rod is fixedly arranged on the back side of the limit plate, and a slide groove is opened on the top of the slide seat from top to bottom. The end of the screw rod limits the axial freedom in the slide groove but is vertically slidably connected to the limit plate.

3. The manual three-jaw linkage balanced clamping structure according to claim 1 is characterized in that: The front side of the limiting seat is provided with a stepped groove for limiting the workpiece, and the front side of the limiting seat is provided with a clamping groove corresponding to the clamping jaws for giving way to the clamping jaws to clamp the workpiece.

4. The manual three-jaw linkage balanced clamping structure according to claim 3 is characterized in that: The bottom of the stepped groove is fixedly connected to an arc-shaped support rod for extending into the workpiece for support, and the end of the arc-shaped support rod is vertically fixedly connected to an arc-shaped push rod for facilitating the push rod to be connected to the inner wall of the workpiece.

5. The manual three-jaw linkage balanced clamping structure according to claim 1 is characterized in that: The size of the clearance groove is larger than the size of the clamping jaw to allow the clamping jaw to be adaptively displaced, and the angles between adjacent protruding handles are consistent.

6. The manual three-jaw linkage balanced clamping structure according to claim 1 is characterized in that: The lower end of the limiting plate is fixedly connected with a bottom plate, and the lower end of the bottom plate is fixedly connected to a base. The base on the positive side of the limiting plate is fixedly provided with a plurality of clamping parts arranged around the periphery of the workpiece.

7. The manual three-jaw linkage balanced clamping structure according to claim 6 is characterized in that: The clamping member comprises a pillar vertically fixedly connected to the base, the top of each pillar is provided with a screw hole toward the center of the base and each pillar is screwed through by a positioning screw to be connected to the outer periphery of the workpiece.

8. The manual three-jaw linkage balanced clamping structure according to claim 7 is characterized in that: The clamping members are provided in three groups and are distributed in a triangular shape on the outer peripheral side of the workpiece.

9. The manual three-jaw linkage balanced clamping structure according to claim 1 is characterized in that: The other end of the screw rod is fixedly connected with a turning handle.

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