A top pier clamping device for a CNC pipe bending machine

Abstract

The present invention discloses a top pier clamping device of a numerical control pipe bending machine, comprising: a support frame, the support frame is provided with at least two openings, and the two openings are adjacent; a rotary clamping structure, the rotary clamping structure is rotatably connected to the inner cavity of the support frame, and the rotary clamping structure comprises: a pushing chuck, a fixed clamping block, a fixed shaft and a pushing component, the fixed clamping block is provided with a first semicircular arc groove; the inner wall of the support frame is fixedly connected with an axis fixing block and the axis fixing block is symmetrically arranged on both sides of the inside of the support frame, the end of the fixed shaft is fixed in the axis fixing block, the pushing chuck is sleeved on the fixed shaft and the pushing chuck rotates circumferentially around the fixed shaft. According to the present invention, the whole set of equipment has a simple structure, a large clamping force, and a small footprint. When the pipe is bent, all components of the top pier clamping device are lower than the lower surface of the pipe, and the whole set of equipment can adjust the axial position of the pushing chuck according to the radius of the pipe.

Description

Technical Field

[0001] The invention relates to the technical field of top pier clamping, and in particular to a top pier clamping device of a numerical control pipe bending machine. Background Art

[0002] CNC pipe bending machines are used for bending pipes in aerospace, automobiles, locomotives, motorcycles, ships, petrochemicals, electricity, natural gas, nuclear industry, boilers, vehicles, fitness equipment, air conditioning and refrigeration, sporting goods, etc., and they are the leading products in the domestic pipe bending machine market. CNC pipe bending machines can perform winding bending of pipes with one bending radius (single layer) or two bending radii (double layer) in a cold state, and are widely used in the bending of various pipes and wires in the automobile, air conditioning and other industries. Pipe bending machines are mainly used for plastic forming of pipes.

[0003] However, there are some problems with current CNC pipe bending machines. First, when the pipe is bent, the wall thickness at the elbow of the pipe will become thinner, which may easily cause the pipe to be unqualified after bending. It is necessary to reduce the wall thickness at the elbow. Second, when the existing pipe bending machine completes the bending action, it is necessary to manually remove the pipe or perform the next operation, which makes the work efficiency low.

[0004] In view of this, it is necessary to develop a top pier clamping device for a CNC pipe bending machine to solve the above problems. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a top pier clamping device for a CNC pipe bending machine. The whole set of equipment has a simple structure, a large clamping force, and a small footprint. When the pipe is bent, all components of the top pier clamping device are lower than the lower surface of the pipe, and the pipe can move axially or perpendicular to the axial direction. The whole set of equipment can adjust the axial position of the clamp according to the size of the bending radius. In order to achieve the above-mentioned purpose and other advantages of the present invention, a top pier clamping device for a CNC pipe bending machine is provided, comprising:

[0006] A support frame, wherein the support frame has at least two openings, and the two openings are adjacent to each other; and

[0007] A rotary clamping structure, wherein the rotary clamping structure is rotatably connected to the inner cavity of the support frame, and the rotary clamping structure comprises: a pushing clamp, a fixed clamping block, a fixed shaft and a pushing component, wherein the fixed clamping block is provided with a first semicircular arc groove;

[0008] Among them, the inner wall of the support frame is fixed with an axis fixing block and the axis fixing blocks are symmetrically arranged on both sides of the support frame, the end of the fixed shaft is fixed in the axis fixing block, the pushing chuck is sleeved on the fixed shaft and the pushing chuck rotates circumferentially around the fixed shaft.

[0009] Preferably, the pushing component comprises:

[0010] A driving shaft, on which an oil cylinder is fixedly connected;

[0011] A hinge plate, one end of which is sleeved on the driving shaft, and the other end of which is sleeved on the driving chuck;

[0012] A force bearing block, wherein the force bearing block is fixedly connected to the end of the driving shaft,

[0013] The piston rod of the oil cylinder is fixed on the driving shaft and the piston rod drives the driving shaft to move horizontally, so that the hinge plate rotates circumferentially around the driving shaft.

[0014] Preferably, a fixing block is integrally connected to the upper surface of the support frame, the fixing block is also fixed to the shaft fixing block, the shaft fixing block is integrally connected to the inner wall of the support frame, and the fixing clamp block is fixed to one side surface of the fixing block.

[0015] Preferably, a baffle is fixedly connected to the outer wall of the support frame, and the baffle is symmetrically arranged on the two outer walls of the support frame.

[0016] Preferably, the pushing chuck comprises a shaft connecting block and a clamping block, wherein the shaft connecting block and the clamping block are integrally connected, and surfaces on the same side of the shaft connecting block and the clamping block are both arc surfaces.

[0017] Preferably, a second semi-circular arc groove is axially formed on one side surface of the clamping block, and the second semi-circular arc groove fits with the first semi-circular arc groove to form a circular groove.

[0018] Compared with the prior art, the invention has the following beneficial effects: when bending a pipe, the oil cylinder pushes the push shaft to move along the reverse X-axis, giving the push chuck a power to move upward, so that the push chuck can tightly clamp the pipe. After the pipe is bent, the oil cylinder piston rod retracts, and the pipe chuck rotates downward around the fixed axis and returns to its original position. At this time, all components are lower than the lower surface of the pipe. The whole set of equipment can adjust the axial position of the push chuck according to the size of the bending radius. The whole set of equipment has a simple structure, a large clamping force, and a small footprint. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the top pier clamping device of the CNC pipe bending machine according to the present invention, which is in a working state after the pipe bending is completed;

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the rotary clamping structure of the top pier clamping device of the CNC pipe bending machine according to the present invention;

[0021] Figure 3 A schematic diagram of the three-dimensional structure of a support frame of the top pier clamping device of the CNC pipe bending machine according to the present invention;

[0022] Figure 4 A schematic diagram of the three-dimensional structure of a push chuck of the top pier clamping device of the CNC pipe bending machine according to the present invention;

[0023] Figure 5 A top view of the rotary clamping structure of the top pier clamping device of the CNC pipe bending machine according to the present invention;

[0024] Figure 6 for Figure 5 Cross-sectional view in the AA direction.

[0025] 1. Support frame; 2. Rotary clamping structure; 3. Shaft fixing block; 4. Fixing block; 5. Baffle; 21. Pushing chuck; 22. Fixed shaft; 23. Fixed clamping block; 24. Pushing component; 231. First semicircular arc groove; 241. Pushing shaft; 242. Cylinder; 243. Hinge plate; 244. Force block; 245. Circular column; 211. Clamping block; 212. Shaft connecting block; 213. Second semicircular arc groove; 2421. Piston rod. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Reference Figure 1 , a support frame 1, the support frame 1 has at least two openings, and the two openings are adjacent to each other; and a rotary clamping structure 2, the rotary clamping structure 2 is rotatably connected to the inner cavity of the support frame 1, the rotary clamping structure 2 comprises: a pushing clamp 21, a fixed clamping block 23, a fixed shaft 22 and a pushing component 24, a side surface of the fixed clamping block 23 is provided with a first semi-circular arc groove 231 along the length direction, the first semi-circular arc groove 231 is used to place the pipe, the top of the support frame 1 is an opening, because the rotary clamping structure 2 needs to be rotated upward to the position of the fixed clamping block 23, and the fixed clamping block 23 is located on the upper surface of the support frame 1.

[0028] Reference Figure 3 The inner wall of the support frame 1 is fixedly connected with an axis fixing block 3 and the axis fixing blocks 3 are symmetrically arranged on both sides of the support frame 1 . The symmetrically arranged axis fixing blocks 3 are used to fix the fixed axis 22 , and the two ends of the fixed axis 22 are fixed in the axis fixing blocks 3 .

[0029] Reference Figure 2The pushing component 24 includes: a pushing shaft 241, on which an oil cylinder 242 is fixedly connected; a hinge plate 243, one end of which is sleeved on the pushing shaft 241, and the other end of which is sleeved on the pushing chuck 21; a force block 244, which is fixedly connected to the end of the pushing shaft 241, and a circular column 245 is integrally fixedly connected to the pushing shaft 241, and the end of the piston rod 2421 is a threaded section, and the piston rod 2421 is screwed into the circular column 245 through the threaded section, so that the piston rod 2421 is fixedly connected to the pushing shaft 241. When the piston rod 2421 is in the oil When the cylinder 242 moves in the opposite direction of the X-axis, the pushing shaft 241 will move horizontally with the piston rod 2421. One end of the hinge plate 243 is sleeved on the pushing shaft 241, and the hinge plate 243 rotates circumferentially around the pushing shaft 241. When the pushing shaft 241 moves in the opposite direction of the X-axis, the hinge plate 243 will move upward, and the other end of the hinge plate 243 is sleeved on the pushing chuck 21, so that the hinge plate 243 drives the pushing chuck 21 to move upward, and the pushing chuck 21 is sleeved on the fixed shaft 22, so that the pushing chuck 21 moves upward around the fixed shaft 22 to the position of the first semicircular arc groove 231.

[0030] Furthermore, when the pipe bending is completed, when the piston rod 2421 moves in the positive direction of the X-axis under the action of the cylinder 242, the piston rod 2421 drives the hinge plate 243 to move downward. When the hinge plate 243 moves downward, it drives the push clamp 21 to move downward, and the push clamp 21 moves around the fixed axis 22 to below the lower surface of the fixed clamp block 23, so that the pipe can move, and the rotary clamping structure 2 will not be affected by the movement of the pipe.

[0031] Furthermore, a fixing block 4 is integrally connected to the upper surface of the support frame 1, and the fixing block 4 is also fixed to the shaft fixing block 3, and the shaft fixing block 3 is integrally connected to the inner wall of the support frame 1, and the fixing clamping block 23 is fixed to the side surface of the fixing block 4 facing the rotary clamping structure 2.

[0032] Furthermore, a baffle 5 is fixedly connected to the outer wall of the support frame 1 and the baffle 5 is symmetrically arranged on the two outer walls of the support frame 1. When the pipe is bent, the hinge plate 243 will generate a large thrust downward. If there is no baffle 5, the thrust will act on the support frame 1 and easily cause the support frame to break. At this time, the baffles 5 symmetrically fixed on the two side surfaces of the support frame 1 will resist the downward thrust generated by the hinge plate 243, and the support frame 1 will not break.

[0033] Furthermore, the pushing chuck 21 includes an axial connecting block 212 and a clamping block 211, wherein the axial connecting block 212 and the clamping block 211 are integrally connected, and the surfaces on the same side of the axial connecting block 212 and the clamping block 211 are both arc surfaces. At this time, the pushing chuck 21 is in a semi-embracing structure, moving upward to clamp the pipe.

[0034] Furthermore, a second semi-circular groove 213 is axially formed on one side of the clamping block 211 , and the second semi-circular groove 213 fits with the first semi-circular groove 231 to form a circular groove. At this time, the pipe is clamped by the second semi-circular groove 213 and the first semi-circular groove 231 .

[0035] Working principle: Before bending the pipe, first place the pipe in the first semi-circular arc groove 231 of the fixed clamp block 23. At this time, the oil cylinder 242 drives the push shaft 241 to move in the opposite direction along the X-axis, thereby driving the hinge plate 243 to move upward, and the hinge plate 243 is sleeved on the push clamp 21. Thus, the hinge plate 243 moves upward and drives the push clamp 21 to rotate upward around the fixed axis 22 and move to the fixed clamp block 23, so that the second semi-circular arc groove 213 in the clamp block 211 engages with the pipe. When the pipe is bent, the oil cylinder 242 moves forward along the X-axis and drives the hinge plate 243 to move downward around the push shaft 241, so that the hinge plate 243 drives the push clamp 21 to move downward, so that the entire push clamp 21 is lower than the lower surface of the pipe, thereby not affecting the movement of the pipe.

[0036] The number of devices and processing scales described here are used to simplify the description of the present invention. Applications, modifications and variations of the present invention will be obvious to those skilled in the art.

[0037] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A top pier clamping device for a CNC pipe bending machine, comprising: A support frame (1), the support frame (1) having at least two openings, and the two openings are adjacent to each other; as well as A rotary clamping structure (2), the rotary clamping structure (2) is rotatably connected to the inner cavity of the support frame (1), the rotary clamping structure (2) comprises: a pushing clamp (21), a fixed clamping block (23), a fixed shaft (22) and a pushing component (24), the fixed clamping block (23) being provided with a first semicircular arc groove (231); The inner wall of the support frame (1) is fixedly connected with a shaft fixing block (3), and the shaft fixing block (3) is symmetrically arranged on both sides of the support frame (1), the end of the fixed shaft (22) is fixed in the shaft fixing block (3), the pushing chuck (21) is sleeved on the fixed shaft (22), and the pushing chuck (21) rotates circumferentially around the fixed shaft (22), and the pushing component (24) comprises: A driving shaft (241), wherein an oil cylinder (242) is fixedly connected to the driving shaft (241); A hinge plate (243), one end of the hinge plate (243) is sleeved on the driving shaft (241), and the other end of the hinge plate (243) is sleeved on the driving chuck (21); A force bearing block (244), wherein the force bearing block (244) is fixedly connected to the end of the driving shaft (241), The piston rod (2421) of the oil cylinder (242) is fixed on the driving shaft (241) and the piston rod (2421) drives the driving shaft (241) to move in the horizontal direction, so that the hinge plate (243) rotates circumferentially around the driving shaft (241). The upper surface of the support frame (1) is integrally connected with a fixing block (4), and the fixing block (4) is also fixed to the shaft fixing block (3). The shaft fixing block (3) is integrally connected to the inner wall of the support frame (1), and the fixing clamp (23) is fixed to one side surface of the fixing block (4).

2. The top pier clamping device of the CNC pipe bending machine according to claim 1, characterized in that: A baffle (5) is fixedly connected to the outer wall of the support frame (1), and the baffle (5) is symmetrically arranged on the two outer walls of the support frame (1).

3. The top pier clamping device of the CNC pipe bending machine according to claim 1, characterized in that: The pushing chuck (21) comprises a shaft connecting block (212) and a clamping block (211), wherein the shaft connecting block (212) and the clamping block (211) are connected in one piece, and surfaces on the same side of the shaft connecting block (212) and the clamping block (211) are both arc surfaces.

4. The top pier clamping device of the CNC pipe bending machine according to claim 1 or 3, characterized in that: A second semi-circular arc groove (213) is formed on one side of the clamping block (211) along the axial direction, and the second semi-circular arc groove (213) fits with the first semi-circular arc groove (231) to form a circular groove.

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