Bar clamp

Abstract

The utility model relates to the technical field of clamps, in particular to a bar clamp which comprises a base, a round pipe is detachably installed on the upper surface of the base, a clamping structure is arranged on the arc face of the round pipe, the clamping structure comprises four fixing pipes, the fixing pipes are fixedly connected with the round pipe and communicated with the round pipe, and the fixing pipes are connected with the round pipe. A top block is slidably connected to the inner wall of the fixing pipe, a bolt is in threaded connection with the interior of the fixing pipe, a pressing block is rotatably connected to the lower end of the bolt, the pressing block is slidably connected with the fixing pipe, a threaded rod is in threaded connection with the interior of the top block, an adjusting block is fixedly connected to one end of the threaded rod, and a rotating ring is fixedly connected to the arc surface of the threaded rod. According to the clamp, the clamping structure is arranged, the self-locking performance of the threads is utilized, a material bar can be clamped through the rotating bolt, the force for clamping the material bar can be adjusted by rotating the bolt, and therefore the practicability of the clamp is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fixtures, in particular to a bar fixture. Background Art

[0002] A fixture is a tool used for clamping and fixing workpieces. It is usually used in processes such as machining, assembly, welding, and testing, and can ensure that the workpiece maintains a stable and accurate position during operation. When machining a bar, a fixture is also required to clamp and fix the bar.

[0003] In the prior art, there is a patent document with the authorization announcement number CN218426927U. This patent document discloses a bar clamping tooling. A fixed frame is arranged on a base, and a jack is provided in the center of the fixed frame. A plurality of through upper slot holes and lower slot holes are respectively opened on the upper and lower end wall surfaces of the fixed frame. A plurality of upper claws and lower claws are respectively inserted into the upper slot holes and lower slot holes, and the inner ends of the upper claws and lower claws extend into the jack. When clamping the bar, a plurality of upper claws and lower claws on the upper and lower sides of the fixed frame respectively clamp and fix the bar at two different positions, with good clamping stability. The bar is not easy to shake and damage the tool bit during rotation, ensuring the machining accuracy of the bar, improving the machining efficiency, and reducing the product rejection rate.

[0004] The above and the prior art have the following defects: When clamping the bar, it is necessary to manually push the upper clamping part and the lower clamping part against the arc surface of the bar, and then fix the upper clamping part and the lower clamping part. The purpose of clamping the bar is achieved by the friction force between the upper clamping part and the lower clamping part and the bar. However, the force when manually pushing the upper clamping part and the lower clamping part against the arc surface of the bar is small, so it is difficult to stably clamp and fix the bar, reducing the practicability of the fixture.

[0005] Therefore, a bar fixture is proposed. Summary of the Utility Model

[0006] The purpose of the utility model is to solve the defect that the force is small when manually pushing the upper clamping part and the lower clamping part against the arc surface of the bar, so it is difficult to stably clamp and fix the bar, and a bar fixture is proposed.

[0007] To achieve the above purpose, the utility model adopts the following technical scheme: A bar fixture, including a base, a circular tube is detachably installed on the upper surface of the base, a clamping structure is arranged on the arc surface of the circular tube, the clamping structure includes four fixed tubes, the fixed tubes are fixedly connected to and communicate with the circular tube, a top block is slidably connected to the inner wall of the fixed tube, a bolt is threadedly connected in the fixed tube, the lower end of the bolt is rotatably connected to a pressing block, and the pressing block is slidably connected to the fixed tube.

[0008] The effects achieved by the above components are as follows: By setting the clamping structure and utilizing the self-locking property of the thread, the material rod can be clamped by rotating the bolt, and the clamping force of the material rod can also be adjusted by rotating the bolt, thereby improving the practicality of the fixture.

[0009] Preferably, a threaded rod is connected to the top block in a threaded manner, and one end of the threaded rod is fixedly connected to an adjusting block.

[0010] The effects achieved by the above components are as follows: When the threaded rod rotates, it will drive the adjusting block to move by means of the thread. By adjusting the position of the adjusting block, material rods with different diameters can be clamped.

[0011] Preferably, a rotating ring is fixedly connected to the arc surface of the threaded rod.

[0012] The effects achieved by the above components are as follows: When the rotating ring is rotated, the rotating ring will drive the threaded rod to rotate.

[0013] Preferably, a leaf spring is fixedly connected to the lower surface of the top block, and one end of the leaf spring is fixedly connected to the fixed pipe.

[0014] The effects achieved by the above components are as follows: When the leaf spring contracts, the top block will slide back into the fixed pipe by means of the pulling force of the leaf spring, so that the top block is automatically reset.

[0015] Preferably, a positioning block is fixedly connected to the side wall of the pressing block.

[0016] The effects achieved by the above components are as follows: When the pressing block moves, it will drive the positioning block to move. The positioning block can limit the moving distance of the pressing block and prevent the pressing block from slipping out of the fixed pipe.

[0017] Preferably, a protective structure is provided on the inner wall of the circular pipe. The protective structure includes a support plate fixedly connected to the circular pipe. Two arc-shaped holes are formed on the surface of the support plate. A clamping block is slidably connected to the inner wall of the arc-shaped hole. The upper end of the clamping block is fixedly connected to a mounting plate. A rubber pad is fixedly connected to the upper surface of the mounting plate. A rubber ring is fixedly connected to the lower surface of the mounting plate. The rubber ring abuts against the surface of the support plate.

[0018] The effects achieved by the above components are as follows: By setting the protective structure, when the material rod is inserted into the circular pipe, it will contact the rubber pad. At this time, the rubber pad and the rubber ring cooperate to buffer the material rod, thereby avoiding the situation that the lower end of the material rod is deformed and damaged due to violent collision.

[0019] Preferably, two circular holes are formed on the surface of the support plate. The circular holes are communicated with the arc-shaped holes. A blocking block is fixedly connected to the lower end of the clamping block. The size of the blocking block is adapted to the size of the circular holes.

[0020] The effects achieved by the above components are as follows: When the mounting plate rotates, the clamping block slides into the inner wall of the arc-shaped hole. At this time, the stop block prevents the clamping block from sliding upward, thereby restricting the position of the mounting plate.

[0021] Compared with the prior art, the advantages and positive effects of the present utility model are as follows.

[0022] 1. In the present utility model, by setting a clamping structure and utilizing the self-locking property of the thread, the material rod can be clamped by rotating the bolt, and the clamping force of the material rod can also be adjusted by rotating the bolt, thereby improving the practicality of the fixture.

[0023] 2. In the present utility model, by setting a protection structure, when the material rod is inserted into the round tube, it will contact the rubber pad. At this time, the rubber pad and the rubber ring cooperate to buffer the material rod, thereby avoiding the situation that the lower end of the material rod is deformed and damaged due to violent collision. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0025] Figure 2 It is a schematic cross-sectional structure diagram of the round tube part of the present utility model;

[0026] Figure 3 It is a schematic cross-sectional structure diagram of the fixed tube part of the present utility model;

[0027] Figure 4 It is a schematic exploded structure diagram of the support plate part of the present utility model.

[0028] Legend: 1. Base; 2. Round tube; 3. Clamping structure; 31. Fixed tube; 32. Top block; 33. Bolt; 34. Pressure block; 35. Threaded rod; 36. Adjusting block; 37. Rotating ring; 38. Leaf spring; 39. Positioning block; 4. Protection structure; 41. Support plate; 42. Arc-shaped hole; 43. Clamping block; 44. Mounting plate; 45. Rubber pad; 46. Rubber ring; 47. Stop block; 48. Round hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to more clearly understand the above objects, features and advantages of the present utility model, the present utility model will be further described below with reference to the drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0030] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed in the following specification.

[0031] As Figures 1-4 shown, the utility model provides a bar fixture, which includes a circular tube 2 detachably installed on the upper surface of a base 1. A clamping structure 3 is arranged on the arc surface of the circular tube 2, and a protection structure 4 is arranged on the inner wall of the circular tube 2.

[0032] Next, the specific settings and functions of its clamping structure 3 and protection structure 4 will be described in detail.

[0033] As Figure 2 and Figure 3 shown, the clamping structure 3 includes four fixed tubes 31. The fixed tubes 31 are fixedly connected to and communicate with the circular tube 2. A top block 32 is slidably connected to the inner wall of the fixed tube 31. A bolt 33 is threadedly connected to the fixed tube 31. The lower end of the bolt 33 is rotatably connected to a pressing block 34. The pressing block 34 is slidably connected to the fixed tube 31. A threaded rod 35 is threadedly connected to the top block 32. One end of the threaded rod 35 is fixedly connected to an adjusting block 36. When the threaded rod 35 rotates, it will drive the adjusting block 36 to move by means of the thread. By adjusting the position of the adjusting block 36, bar stocks with different diameters can be clamped. A rotating ring 37 is fixedly connected to the arc surface of the threaded rod 35. When the rotating ring 37 is rotated, the rotating ring 37 will drive the threaded rod 35 to rotate. A leaf spring 38 is fixedly connected to the lower surface of the top block 32. One end of the leaf spring 38 is fixedly connected to the fixed tube 31. When the leaf spring 38 contracts, the top block 32 will slide back into the fixed tube 31 by means of the pulling force of the leaf spring 38, so that the top block 32 automatically resets. A positioning block 39 is fixedly connected to the side wall of the pressing block 34. When the pressing block 34 moves, it will drive the positioning block 39 to move. The positioning block 39 can limit the moving distance of the pressing block 34 and prevent the pressing block 34 from slipping out of the fixed tube 31.

[0034] As Figure 4 shown, the protection structure 4 includes a support plate 41. The support plate 41 is fixedly connected to the circular tube 2. Two arc-shaped holes 42 are formed on the surface of the support plate 41. A clamping block 43 is slidably connected to the inner wall of the arc-shaped hole 42. The upper end of the clamping block 43 is fixedly connected to a mounting plate 44. A rubber pad 45 is fixedly connected to the upper surface of the mounting plate 44. A rubber ring 46 is fixedly connected to the lower surface of the mounting plate 44. The rubber ring 46 abuts against the surface of the support plate 41. Two round holes 48 are formed on the surface of the support plate 41. The round holes 48 communicate with the arc-shaped holes 42. A stop block 47 is fixedly connected to the lower end of the clamping block 43. The size of the stop block 47 is adapted to the size of the round hole 48. When the mounting plate 44 rotates, the clamping block 43 will slide into the inner wall of the arc-shaped hole 42. At this time, the stop block 47 plays a role in preventing the clamping block 43 from sliding upward, thereby restricting the position of the mounting plate 44.

[0035] The overall working principle is as follows. When it is necessary to clamp the material rod, move the mounting plate 44. The movement of the mounting plate 44 will drive the movement of the clamping block 43. The movement of the clamping block 43 will drive the stop block 47 to pass through the circular hole 48. After the rubber ring 46 contacts the support plate 41, rotate the mounting plate 44. The rotation of the mounting plate 44 will cause the clamping block 43 to slide into the inner wall of the arc-shaped hole 42. At this time, the stop block 47 plays a role in preventing the clamping block 43 from sliding upward, thereby restricting the position of the mounting plate 44. After the material rod is inserted into the circular tube 2, it will contact the rubber pad 45. At this time, the rubber pad 45 and the rubber ring 46 cooperate to buffer the material rod, thus avoiding the situation that the lower end of the material rod is deformed and damaged due to violent collision. Then rotate the bolt 33. The bolt 33 will drive the pressing block 34 to move downward by means of the thread. The movement of the pressing block 34 will squeeze the top block 32. The top block 32 will drive the threaded rod 35 to move. The movement of the threaded rod 35 will cause the adjusting block 36 to abut against the arc surface of the material rod. During this process, by using the self-locking property of the thread, the adjusting block 36 can be tightly abutted against the arc surface of the material rod by rotating the bolt 33, so as to firmly clamp the material rod. During this process, when the top block 32 moves, it will stretch the leaf spring 38. When the pressing block 34 moves, it will drive the positioning block 39 to move. The positioning block 39 can limit the moving distance of the pressing block 34 and prevent the pressing block 34 from slipping out of the fixed tube 31. When it is necessary to remove the material rod, rotate the bolt 33 in the reverse direction to make the pressing block 34 move upward. At this time, the leaf spring 38 begins to contract, and the top block 32 will slide back into the fixed tube 31 by means of the pulling force of the leaf spring 38, so that the top block 32 is automatically reset. When it is necessary to clamp material rods with different diameters, rotate the rotating ring 37. The rotating ring 37 will drive the threaded rod 35 to rotate. The threaded rod 35 will drive the adjusting block 36 to move by means of the thread. By adjusting the position of the adjusting block 36, material rods with different diameters can be clamped.

[0036] The above is only the preferred embodiment of the present invention, and it is not a limitation of the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. A bar clamp, comprising a base (1), characterized in that: A circular tube (2) is detachably mounted on the upper surface of the base (1); a clamping structure (3) is provided on the arc surface of the circular tube (2); the clamping structure (3) comprises four fixed tubes (31); the fixed tubes (31) are fixedly connected to and communicate with the circular tube (2); a top block (32) is slidably connected to the inner wall of the fixed tube (31); a bolt (33) is internally threadedly connected to the fixed tube (31); a pressure block (34) is rotatably connected to the lower end of the bolt (33); and the pressure block (34) is slidably connected to the fixed tube (31).

2. A bar fixture according to claim 1, characterized in that: The top block (32) is internally threadedly connected to a threaded rod (35), and one end of the threaded rod (35) is fixedly connected to an adjustment block (36).

3. A bar fixture according to claim 2, characterized in that: The arc surface of the threaded rod (35) is fixedly connected with a rotating ring (37).

4. A bar fixture according to claim 1, characterized in that: A leaf spring (38) is fixedly connected to the lower surface of the top block (32), and one end of the leaf spring (38) is fixedly connected to the fixed tube (31).

5. The bar fixture according to claim 1, characterized in that: A positioning block (39) is fixedly connected to the side wall of the pressing block (34).

6. A bar fixture according to claim 1, characterized in that: The inner wall of the circular tube (2) is provided with a protective structure (4), the protective structure (4) comprising a support plate (41), the support plate (41) being fixedly connected to the circular tube (2), the surface of the support plate (41) being provided with two arc-shaped holes (42), the inner wall of the arc-shaped hole (42) being slidably connected with a clamping block (43), the upper end of the clamping block (43) being fixedly connected with a mounting plate (44), the upper surface of the mounting plate (44) being fixedly connected with a rubber pad (45), the lower surface of the mounting plate (44) being fixedly connected with a rubber ring (46), the rubber ring (46) being against the surface of the support plate (41).

7. A bar fixture according to claim 6, characterized in that: The surface of the support plate (41) is provided with two circular holes (48), the circular holes (48) are connected to the arc-shaped hole (42), and the lower end of the clamping block (43) is fixedly connected with a stopper (47), and the size of the stopper (47) is adapted to the size of the circular hole (48).

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