Round lining positioning tool

Abstract

A circular lining positioning tool comprises a core tube, a screw rod, a conical block, a pressing plate and an elastic ring. A plurality of strip-shaped holes formed in the length direction are formed in the side wall of the core tube, and the strip-shaped holes are formed along the circumference of the core tube in an array manner; the screw rod is coaxially and rotatably arranged in the core tube, and external threads with opposite screwing directions are arranged at the two ends of the screw rod; the number of the conical blocks is two, the conical blocks are coaxially arranged in the core tube in a sliding mode, the conical tops of the conical blocks face the middle of the core tube, the two ends of the screw penetrate through the two conical blocks respectively, and the screw is connected with the conical blocks through external threads; the number of the pressing plates is consistent with that of the strip-shaped holes, the pressing plates penetrate through the strip-shaped holes respectively, the outer side edges of the pressing plates are parallel to the core tube and face the outside of the core tube, and the two ends of the inner sides of the pressing plates are provided with slopes matched with the conical surfaces of the conical blocks; and the elastic ring sleeves the outer sides of all the pressing plates and is used for applying pressure towards the axis of the core tube to the pressing plates. According to the scheme, the lining is pressed and fixed through the inner hole, the outer portion of the lining is prevented from being shielded, and the outer wall of the lining can be machined conveniently.

Description

Technical Field

[0001] The utility model belongs to the technical field of part jigs, and particularly relates to a positioning tooling for a circular bushing. Background Art

[0002] The bushing is usually of a circular tube structure with both ends being through. For some bushings, holes, grooves and other structures need to be machined on their outer walls. If a traditional three-jaw chuck type fixture is used to clamp the outer circle of the bushing, it is easy to block the machining area. If both ends of the outer wall of the bushing need to be machined, disassembly and reassembly work is required after machining one end to adjust the position of the bushing. Therefore, using a traditional fixture to clamp the bushing through the outer wall has a relatively large impact on the machining efficiency. Summary of the Utility Model

[0003] To solve the deficiencies of the prior art, the utility model provides a positioning tooling for a circular bushing, which presses and fixes the bushing through the inner hole, avoids covering the outside of the bushing, and is more convenient for machining the outer wall of the bushing.

[0004] In order to achieve the purpose of the utility model, the following scheme is proposed:

[0005] A positioning tooling for a circular bushing includes: a core tube, a screw rod, a conical block, a pressing plate and an elastic ring.

[0006] The side wall of the core tube is provided with strip-shaped holes arranged along the length direction, and a plurality of strip-shaped holes are arranged in a circumferential array along the core tube;

[0007] The screw rod is coaxially and rotatably arranged in the core tube, and both ends of the screw rod have external threads with opposite helix directions;

[0008] The number of conical blocks is two, which are coaxially and slidably arranged in the core tube, and the cone tips of the conical blocks all face the middle of the core tube. Both ends of the screw rod respectively pass through the two conical blocks, and the screw rod is connected to the conical blocks through the external threads;

[0009] The number of pressing plates is the same as that of the strip-shaped holes. The pressing plates are respectively arranged in the strip-shaped holes. The outer edges of the pressing plates are parallel to the core tube and face the outside of the core tube. Both ends of the inner side of the pressing plates have inclined surfaces that cooperate with the conical surfaces of the conical blocks;

[0010] The elastic ring is sleeved on the outside of all the pressing plates and is used to apply a pressure towards the axis of the core tube to the pressing plates.

[0011] The beneficial effect of the utility model is that: this scheme fixes the bushing from the inside, so that the outside of the bushing is completely exposed, avoids repeated clamping of the bushing, and is convenient for machining on the outer wall of the bushing. Description of the Drawings

[0012] The accompanying drawings described in this document are only for illustrating the selected embodiments, not all possible implementation schemes, and are not intended to limit the scope of the present utility model.

[0013] Figure 1 The structural schematic diagram of a preferred embodiment of the present application is shown.

[0014] Figure 2 The cross-sectional view of a preferred embodiment of the present application is shown.

[0015] Figure 3 The structural schematic diagram of another preferred embodiment of the present application is shown.

[0016] Figure 4 The cross-sectional view of another preferred embodiment of the present application is shown.

[0017] Markings in the figure: core tube - 1, strip hole - 11, partition - 12, strip groove - 13, screw - 2, conical block - 3, convex block - 31, pressing plate - 4, inclined surface - 41, card slot - 42, limiting groove - 43, elastic ring - 5. Specific embodiments

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will describe the embodiments of the present utility model in detail with reference to the accompanying drawings. However, the embodiments described in the present utility model are only a part of the embodiments of the present utility model, not all of the embodiments.

[0019] As Figures 1 to 4 shown, a circular bushing positioning tooling includes: a core tube 1, a screw 2, a conical block 3, a pressing plate 4, and an elastic ring 5.

[0020] A strip hole 11 is provided on the side wall of the core tube 1 along the length direction, and a plurality of strip holes 11 are arranged in a circumferential array along the core tube 1.

[0021] The screw 2 is coaxially and rotatably arranged inside the core tube 1, and both ends of the screw 2 have external threads with opposite helix directions.

[0022] The number of conical blocks 3 is two, which are coaxially and slidably arranged inside the core tube 1, and the cone tips of the conical blocks 3 all face the middle of the core tube 1. Both ends of the screw 2 respectively pass through the two conical blocks 3, and the screw 2 is connected to the conical blocks 3 through external threads.

[0023] The number of pressing plates 4 is the same as that of the strip holes 11. The pressing plates 4 are respectively inserted into the strip holes 11. The outer edges of the pressing plates 4 are parallel to the core tube 1 and face the outside of the core tube 1. Both ends of the inner side of the pressing plate 4 have inclined surfaces 41 that cooperate with the conical surfaces of the conical blocks 3.

[0024] The elastic ring 5 is sleeved on the outside of all the pressing plates 4 and is used to apply a pressure towards the axis of the core tube 1 to the pressing plates 4.

[0025] Working principle: Before installing the bushing, by rotating the screw rod 2, the two conical blocks 3 move towards both ends of the core tube 1 respectively. At the same time, under the action of the elastic ring 5, the pressing plate 4 will move towards the inside of the core tube 1 in the strip-shaped hole 11 to reduce the diameter of the circular trajectory formed by the outer edges of multiple pressing plates 4 until the diameter of the circular trajectory is smaller than the inner diameter of the bushing; then the bushing is sleeved outside the fixture; rotate the screw rod 2 to drive both conical blocks 3 to move towards the middle of the core tube 1. During this process, the outer conical surface of the conical block 3 will push the pressing plate 4 to move radially outwards towards the core tube 1 until the outer edge of the pressing plate 4 abuts against the inner wall of the bushing, thereby fixing the bushing. This method fixes the bushing from the inside, making the outside of the bushing completely exposed, facilitating processing on its outer wall.

[0026] Preferably, as Figure 1 shown, the head of the screw rod 2 is located at the front end of the core tube 1, and the rear end of the core tube 1 extends backwards by a predetermined length. During use, the rear end of the core tube 1 can be clamped by a three-jaw chuck, so that a predetermined length is reserved between the front end of the core tube 1 and the bushing and the three-jaw chuck to avoid the three-jaw chuck blocking the processing part on the bushing.

[0027] As another preferred structure, as Figure 3 shown, the head of the screw rod 2 is located at the front end of the core tube 1, and the rear end of the core tube 1 is vertically arranged on the top surface of a T-shaped block, and the T-shaped block is used to connect the basic workbench. This structure is suitable for drilling machine processing.

[0028] Preferably, as Figure 2 shown, a partition 12 is provided in the middle section of the core tube 1, the middle section of the screw rod 2 is rotatably passed through the partition 12, both ends of the core tube 1 are through, so as to facilitate the installation of the conical blocks 3 from both ends respectively. Both ends of the screw rod 2 have connection heads to facilitate rotation by using a wrench. The length of the core tube 1 is greater than the length of the bushing, so that after the bushing is fixed, the end of the core tube 1 can be clamped and connected by a clamping device such as a three-jaw chuck. This structure can connect either end of the core tube 1 to the three-jaw chuck.

[0029] Further preferably, a clamping groove 42 is provided in the middle of the inner side of the pressing plate 4, and it is clamped on the edge of the partition 12 to limit the position of the pressing plate 4 along the axis direction of the core tube 1 and prevent the pressing plate 4 from tilting, improving the stability of the installation structure of the pressing plate 4.

[0030] As a preferred structure, as Figure 4 shown, the end of the core tube 1 is a closed structure, the end of the screw rod 2 is rotatably connected to the end of the core tube 1, the head of the screw rod 2 is located at the front end of the core tube 1. During installation, the conical block 3 and the screw rod 2 are both inserted from the front end of the core tube 1.

[0031] Preferably, as Figure 3 、 Figure 4As shown, a limiting groove 43 is provided in the middle of the outer side of the pressing plate 4. The limiting groove 43 is arranged along the tangential direction of the core pipe 1. The elastic ring 5 is arranged in the limiting groove 43 to prevent the elastic ring 5 from shifting and falling, and at the same time avoid the elastic ring 5 from contacting the inner wall of the bushing.

[0032] Preferably, as Figures 1 to 4 shown, a strip-shaped groove 13 is provided in the inner wall of the core pipe 1 along the axial direction. A convex block 31 which is slidably arranged in the strip-shaped groove 13 is provided on the outer wall of the conical block 3 to prevent the convex block 31 from rotating around the axis.

[0033] The above are only the preferred embodiments of the present invention, and do not represent that they are the only ones or limit the present invention. Those skilled in the art should understand that various changes or equivalent substitutions made to the present invention without departing from the scope of the present invention all belong to the scope of protection of the present invention.

Claims

1. A circular bushing positioning tool, characterized in that: include: A core tube (1) having a side wall provided with strip holes (11) arranged along the length direction, and a plurality of strip holes (11) are arranged in an array along the circumference of the core tube (1); A screw rod (2) is coaxially rotatably disposed in the core tube (1), and both ends of the screw rod (2) have external threads with opposite rotation directions; Conical blocks (3), two in number, are coaxially slidably arranged in the core tube (1), and the cone tops of the conical blocks (3) are both oriented toward the middle of the core tube (1), the two ends of the screw rod (2) respectively pass through the two conical blocks (3), and the screw rod (2) is connected to the conical blocks (3) via external threads; The pressing plates (4) are the same in number as the strip holes (11), and the pressing plates (4) are respectively inserted into the strip holes (11). The outer edges of the pressing plates (4) are parallel to the core tube (1) and face the outside of the core tube (1). Both ends of the inner side of the pressing plates (4) have inclined surfaces (41) that match the conical surfaces of the conical blocks (3). The elastic ring (5) is sleeved on the outside of all the pressing plates (4) and is used to apply pressure to the pressing plates (4) toward the axis of the core tube (1).

2. A circular bushing positioning tool according to claim 1, characterized in that: The head of the screw rod (2) is located at the front end of the core tube (1), and the rear end of the core tube (1) extends backwards by a predetermined length.

3. A circular bushing positioning tool according to claim 1, characterized in that: The head of the screw rod (2) is located at the front end of the core tube (1), and the rear end of the core tube (1) is vertically arranged on the top surface of a T-block, and the T-block is used to connect to the basic workbench.

4. A circular bushing positioning tool according to claim 1, characterized in that: The end of the core tube (1) is a closed structure, the end of the screw rod (2) is rotatably connected to the end of the core tube (1), and the head of the screw rod (2) is located at the front end of the core tube (1).

5. The circular bushing positioning tool according to claim 1, characterized in that: A partition plate (12) is provided in the middle section of the core tube (1), and the middle section of the screw rod (2) is rotatably arranged through the partition plate (12). Both ends of the core tube (1) are connected, and both ends of the screw rod (2) have connectors. The length of the core tube (1) is greater than the length of the bushing.

6. A circular bushing positioning tool according to claim 5, characterized in that: The inner middle portion of the pressing plate (4) is provided with a clamping groove (42) which is clamped on the edge of the partition plate (12).

7. A circular bushing positioning tool according to claim 1, characterized in that: A limiting groove (43) is provided in the middle of the outer side of the pressing plate (4), the limiting groove (43) is arranged along the tangent direction of the core tube (1), and the elastic ring (5) is arranged in the limiting groove (43).

8. The circular bushing positioning tool according to claim 1, characterized in that: The inner wall of the core tube (1) is provided with a strip groove (13) along the axial direction, and the outer wall of the conical block (3) is provided with a protrusion (31) slidably arranged in the strip groove (13).

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