Positioning clamp for bar

Abstract

The utility model discloses a positioning clamp for a bar. The positioning clamp comprises a support, a rear end cover, a cylinder body, a front end cover, a protective cover, a hollow shaft, a pressing plate, a limiting block, a piston flange and a piston. A rear end cover, a cylinder body, a front end cover and a protective cover are sequentially fixed to one end of the support through bolts, a hollow shaft is rotationally arranged in the support, a pressing plate elastically slides in a waist groove in one end of the hollow shaft, the end, away from the hollow shaft, of the pressing plate is slidably arranged in a limiting groove in a limiting block, and the limiting block is fixedly sleeved with a piston flange. The piston flange is fixed to the surface of one end of the piston through a bolt, the other end of the piston is arranged in the cylinder body in a sliding mode, the cylinder body and the front end cover are connected with the two air outlet ends of the pneumatic electromagnetic valve through air pipes respectively, the air inlet end of the pneumatic electromagnetic valve is connected with an air source, and the pneumatic electromagnetic valve is electrically connected through a controller. The bar clamping device has the advantages that bars with different diameters can be clamped, and meanwhile the clamped bars are not prone to slipping.

Description

Technical Field:

[0001] The utility model relates to the technical field of bar processing equipment, and specifically relates to a positioning fixture for bars. Background Art:

[0002] A bar is a product of a metal material, usually with a circular cross-section, and can be used for machining and constructing various equipment and structures.

[0003] Existing bars are basically cylindrical, so they do not have a plane convenient for clamping. During the bar processing, a positioning fixture is needed to fix the bar. Since the diameters of the processed bars are different and the contact surface between the positioning fixture and the bar is small, it is easy to cause the bar to deform. Therefore, there are problems of poor positioning accuracy and easy slippage. Content of the Utility Model:

[0004] The purpose of the utility model is to provide a positioning fixture for bars to solve the problems raised in the above background art.

[0005] The utility model is implemented by the following technical solutions:

[0006] A positioning fixture for bars includes a support, a rear end cover, a cylinder body, a front end cover, a shield, a hollow shaft, a pressing plate, a limiting block, a piston flange, and a piston; one end of the support is sequentially fixed with a rear end cover, a cylinder body, a front end cover, and a shield through bolts. A hollow shaft is rotatably arranged in the support. One end of the hollow shaft is circumferentially and evenly provided with a plurality of waist grooves and is located in the shield. Each waist groove elastically slides with a pressing plate. A limiting block is also slidably arranged on the hollow shaft. A limiting groove corresponding to the pressing plate is opened in the limiting block. The end of the pressing plate away from the hollow shaft slides into the limiting groove. A piston flange is fixedly sleeved on the limiting block. The piston flange is fixed to the surface of one end of the piston through bolts. The other end of the piston slides in the cylinder body. The cylinder body and the front end cover are respectively provided with a first air hole and a second air hole. The first air hole and the second air hole are respectively connected to two air outlet ends of a pneumatic solenoid valve through air pipes. The air inlet end of the pneumatic solenoid valve is connected to a gas source. The pneumatic solenoid valve is electrically connected to a controller.

[0007] Preferably, a sleeve is fixed in the support. The two ends of the sleeve are fixed with a front cover and a rear cover through bolts respectively. Two angular contact ball bearings are fixed in the sleeve. The surface of the other end of the hollow shaft is fixed to the inner rings of the two angular contact ball bearings. A sprocket is fixed on the other end of the hollow shaft. One end of the sprocket abuts against the rear cover.

[0008] Preferably, the pressing plate is in a "T" shape. Two first counterbores are formed on both sides of the lower surface of the middle part of the pressing plate. The upper end surface of the pressing plate away from the hollow shaft is inclined and faces the piston flange; both sides of the limiting groove are triangular. The upper surface of the pressing plate is in sliding fit with the inner upper surface of the limiting groove. The lower end surface of the pressing plate is placed inside the hollow shaft, and an arc-shaped rubber pad is fixed on the lower end surface of the pressing plate.

[0009] Preferably, second counterbores corresponding to each waist groove are formed on both sides of the hollow shaft, and a compression spring is arranged between the first counterbore and the second counterbore.

[0010] Preferably, the limiting block is in an overall "convex" shape. An elastic retaining ring is fixedly sleeved on the limiting block, and a thrust ball bearing is also sleeved on the limiting block. One end of the thrust ball bearing abuts against the protruding end surface in the middle of the limiting block. The piston flange is fixedly clamped between the elastic retaining ring and the thrust ball bearing.

[0011] Preferably, a first O-ring seal is arranged on the surface of the front end cover in contact with the cylinder block. A second O-ring seal and a first guide ring are arranged on the surface of the front end cover in contact with the piston. Both the second O-ring seal and the first guide ring are in sliding fit with the upper surface of one end of the piston; two third O-ring seals and a second guide ring are symmetrically arranged on the inner and outer sides of the other end of the piston. Both the third O-ring seal and the second guide ring are in sliding fit with the upper and lower surfaces on the inner side of the cylinder block.

[0012] Advantages of the present utility model: By controlling the exhaust direction of the pneumatic solenoid valve through the controller, the gas drives the limiting block to slide on the hollow shaft, so that the pressing plate slides up and down in the waist groove, realizing the actions of clamping and loosening the bar by the pressing plate, and clamping and fixing the bar by using the arc-shaped surface of the arc-shaped rubber pad; it can not only clamp bars with different diameters, but also make the clamped bars not easy to slip off. Description of the drawings:

[0013] Figure 1 is a schematic structural diagram of the present utility model;

[0014] Figure 2 is Figure 1 the front view of

[0015] Figure 3 is Figure 2 the sectional view at A in

[0016] Figure 4 is Figure 3 the enlarged view at B in

[0017] Figure 5 is a partial schematic structural diagram of the present utility model;

[0018] Figure 6 Partial structural axonometric sectional view; Figure 1 of the part in the axial direction;

[0019] Figure 7 Sectional view of the front end cover of the component;

[0020] Figure 8 Sectional view of the cylinder block of the component;

[0021] Figure 9 Is the control flow chart.

[0022] In the figure: 1, support; 2, rear end cover; 3, cylinder block; 3.1, first air hole; 4, front end cover; 4.1, second air hole; 4.2, first O-ring; 4.3, second O-ring; 4.4, first guide ring; 5, shield; 6, hollow shaft; 6.1, waist groove; 6.2, second counterbore; 7, pressing plate; 7.1, first counterbore; 7.2, arc-shaped rubber pad; 8, limit block; 8.1, limit groove; 9, piston flange; 10, piston; 10.1, third O-ring; 10.2, second guide ring; 11, sleeve; 12, front cover; 13, rear cover; 14, angular contact ball bearing; 15, sprocket; 16, compression spring; 17, circlip; 18, thrust ball bearing; 19, bar; 20, pneumatic solenoid valve; 21, controller. Specific implementation mode:

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0024] Please refer to Figures 1-9 , the present invention provides a technical solution for a positioning fixture for bars:

[0025] A positioning fixture for bars, comprising a support 1, a rear end cover 2, a cylinder block 3, a front end cover 4, a shield 5, a hollow shaft 6, a pressing plate 7, a limiting block 8, a piston flange 9 and a piston 10; one end of the support 1 is sequentially fixed with a rear end cover 2, a cylinder block 3, a front end cover 4 and a shield 5 through bolts, a sleeve 11 is fixed inside the support 1, both ends of the sleeve 11 are fixed with a front cover 12 and a rear cover 13 through bolts respectively, two angular contact ball bearings 14 are fixed inside the sleeve 11, the surface of the other end of the hollow shaft 6 is fixed with the inner rings of the two angular contact ball bearings 14, so that the hollow shaft 6 rotates inside the support 1. At the same time, a sprocket 15 is fixed on the other end of the hollow shaft 6, one end of the sprocket 15 abuts against the rear cover 13, and the sprocket 15 is connected to the output shaft of the driving motor through a chain, and the driving motor drives the sprocket 15 to drive the hollow shaft 6 to rotate and operate.

[0026] Three waist grooves 6.1 are evenly arranged along the circumferential direction at one end of the hollow shaft 6 and are located inside the shield 5. The structure of the pressing plate 7 is in a "T" shape. Two first counterbores 7.1 are arranged on both sides of the lower surface of the middle part of the pressing plate 7. Corresponding second counterbores 6.2 are arranged on both sides of each waist groove 6.1 on the hollow shaft 6. A compression spring 16 is arranged between the first counterbore 7.1 and the second counterbore 6.2, so that each pressing plate 7 elastically slides in the waist groove 6.1. A limiting block 8 is also slidably arranged on the hollow shaft 6. A limiting groove 8.1 corresponding to the pressing plate 7 is arranged inside the limiting block 8. The two sides of the limiting groove 8.1 are triangular. The end of the pressing plate 7 away from the hollow shaft 6 slides into the limiting groove 8.1. The upper surface of the pressing plate 7 slidably fits with the inner upper surface of the limiting groove 8.1. Through the limiting block 8, the lower end surface of the pressing plate 7 is placed inside the hollow shaft 6. An arc-shaped rubber pad 7.2 with an arc-shaped structure is fixed on the lower end surface of the pressing plate 7. The upper end surface of the pressing plate 7 away from the hollow shaft 6 is inclined and faces the piston flange 9. By horizontally sliding the limiting block 8 on the hollow shaft 6, the pressing plate 7 slides up and down in the waist groove 6.1 under the action of the compression spring 16. Due to the addition of the arc-shaped surface of the arc-shaped rubber pad 7.2, bars 19 with different diameters can be clamped, and at the same time, the clamped bars 19 are not prone to slipping.

[0027] The above-mentioned limit block 8 is integrally in a "convex" structure. An elastic retaining ring 17 is fixedly sleeved on the limit block 8. A thrust ball bearing 18 is also sleeved on the limit block 8. One end of the thrust ball bearing 18 abuts against the protruding end face in the middle of the limit block 8. The piston flange 9 is fixedly clamped between the elastic retaining ring 17 and the thrust ball bearing 18, so that the piston flange 9 is fixedly sleeved on the limit block 8. The piston flange 9 is fixed to the surface of one end of the piston 10 through bolts. The other end of the piston 10 slides in the cylinder block 3. A first O-ring 4.2 is provided on the surface where the front end cover 4 contacts the cylinder block 3. A second O-ring 4.3 and a first guide ring 4.4 are provided on the surface where the front end cover 4 contacts the piston 10. Both the second O-ring 4.3 and the first guide ring 4.4 are in sliding fit with the upper surface of one end of the piston 10; on the inner and outer sides of the other end of the piston 10, two third O-rings 10.1 and a second guide ring 10.2 are symmetrically provided. Both the third O-ring 10.1 and the second guide ring 10.2 are in sliding fit with the upper and lower surfaces inside the cylinder block 3, so as to ensure the sealing performance inside the cylinder block 3, so that the gas can drive the piston 10 to slide in the cylinder block 3 after entering the cylinder block 3.

[0028] In order to introduce gas into the cylinder block 3, a first air hole 3.1 and a second air hole 4.1 are respectively opened on the cylinder block 3 and the front end cover 4. The first air hole 3.1 and the second air hole 4.1 are respectively connected to two air outlet ends of a pneumatic solenoid valve 20 through air pipes. The pneumatic solenoid valve 20 adopts the model: AirTAC type 4V210-08. This type of pneumatic solenoid valve 20 has two air outlet ends. By controlling one of the air outlet ends to discharge air, the sliding direction of the gas-driven piston 10 in the cylinder block 3 can be realized. The air inlet end of the pneumatic solenoid valve 20 is connected to the air source, and the pneumatic solenoid valve 20 is electrically connected through a controller 21.

[0029] Reference Figure 4 As shown, the working principle is as follows: By controlling the exhaust direction of the pneumatic solenoid valve 20 through the controller 21, the clamping and loosening of the bar 19 by the pressing plate 7 are realized. When the gas enters from the first air hole 3.1 and the second air hole 4.1 exhausts, the gas drives the piston 10 to drive the limit block 8 to slide leftward, so that the pressing plate 7 slides downward to clamp the surface of the bar 19;

[0030] When the gas enters from the second air hole 4.1 and the first air hole 3.1 exhausts, the gas drives the piston 10 to drive the limit block 8 to slide rightward, so that the pressing plate 7 slides upward, so that the three pressing plates 7 no longer clamp the surface of the bar 19, and the bar 19 is loosened and taken out.

[0031] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A positioning fixture for bars, characterized in that: It includes a support (1), a rear end cover (2), a cylinder block (3), a front end cover (4), a shield (5), a hollow shaft (6), a pressing plate (7), a limit block (8), a piston flange (9) and a piston (10); one end of the support (1) is fixedly provided with the rear end cover (2), the cylinder block (3), the front end cover (4) and the shield (5) in sequence through bolts. A hollow shaft (6) is rotatably arranged in the support (1). One end of the hollow shaft (6) is circumferentially and evenly provided with a plurality of waist slots (6.1) and is located in the shield (5). Elastic sliding pressing plates (7) are arranged in each of the waist slots (6.1). A limit block (8) is also slidably arranged on the hollow shaft (6). A limit slot (8.1) corresponding to the pressing plate (7) is arranged in the limit block (8). The end of the pressing plate (7) away from the hollow shaft (6) is slidably placed in the limit slot (8.1). A piston flange (9) is fixedly sleeved on the limit block (8). The piston flange (9) is fixedly connected to the surface of one end of the piston (10) through bolts. The other end of the piston (10) is slidably placed in the cylinder block (3). A first air hole (3.1) and a second air hole (4.1) are respectively arranged on the cylinder block (3) and the front end cover (4). The first air hole (3.1) and the second air hole (4.1) are respectively connected to two air outlet ends of a pneumatic solenoid valve (20) through air pipes. The air inlet end of the pneumatic solenoid valve (20) is connected to an air source. The pneumatic solenoid valve (20) is electrically connected through a controller (21).

2. The positioning fixture for bars according to claim 1, characterized in that: A sleeve (11) is fixed in the support (1). The two ends of the sleeve (11) are fixed with a front cover (12) and a rear cover (13) respectively through bolts. Two angular contact ball bearings (14) are fixed in the sleeve (11). The surface of the other end of the hollow shaft (6) is fixed to the inner rings of the two angular contact ball bearings (14). A sprocket (15) is fixed on the other end of the hollow shaft (6). One end of the sprocket (15) abuts against the rear cover (13).

3. The positioning fixture for bars according to claim 2, characterized in that: The structure of the pressing plate (7) is in a "T" shape. Two first counterbores (7.1) are arranged on both sides of the lower surface of the middle part of the pressing plate (7). The upper end surface of the pressing plate (7) away from the hollow shaft (6) is inclined and faces the piston flange (9); both sides of the limit slot (8.1) are triangular. The upper surface of the pressing plate (7) is slidably attached to the inner upper surface of the limit slot (8.1). The lower end surface of the pressing plate (7) is placed in the hollow shaft (6). An arc-shaped rubber pad (7.2) is fixed to the lower end surface of the pressing plate (7).

4. The positioning fixture for bars according to claim 3, characterized in that: Second counterbores (6.2) corresponding to each other are arranged on both sides of each waist slot (6.1) on the hollow shaft (6). A compression spring (16) is arranged between the first counterbore (7.1) and the second counterbore (6.2).

5. The positioning fixture for bars according to claim 2, wherein: The limiting block (8) is integrally in a "convex" structure. An elastic retaining ring (17) is fixedly sleeved on the limiting block (8). A thrust ball bearing (18) is also sleeved on the limiting block (8). One end of the thrust ball bearing (18) abuts against the protruding end face in the middle of the limiting block (8). The piston flange (9) is fixedly clamped between the elastic retaining ring (17) and the thrust ball bearing (18).

6. The positioning fixture for bars according to claim 1, characterized in that: A first O-ring seal (4.2) is provided on the surface of the front end cover (4) in contact with the cylinder block (3). A second O-ring seal (4.3) and a first guide ring (4.4) are provided on the surface of the front end cover (4) in contact with the piston (10). Both the second O-ring seal (4.3) and the first guide ring (4.4) are in sliding fit with the upper surface at one end of the piston (10). Two third O-ring seals (10.1) and a second guide ring (10.2) are symmetrically provided on the inner and outer sides at the other end of the piston (10). Both the third O-ring seal (10.1) and the second guide ring (10.2) are in sliding fit with the upper and lower surfaces on the inner side of the cylinder block (3).

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