Square pipe bender

Abstract

The utility model provides a square pipe bender, and belongs to the technical field of bent pipe machining. The square pipe bender comprises a fixing base, an upper clamping plate, a lower clamping plate, a sleeve, a center shaft, a bearing, a pipe bending rotating arm, an extrusion shaft sleeve and a pin shaft, the center shaft sequentially penetrates through the fixing base, the lower clamping plate, the sleeve, the upper clamping plate and the bearing from bottom to top, and a first horizontally-unfolded protruding edge is arranged at the lower end of the center shaft and abuts against the bottom of the fixing base; the upper end of the center shaft is in threaded connection with a first locking nut, one end of the bent pipe rotating arm is arranged on the outer side of the bearing in a sleeved mode, the other end of the bent pipe rotating arm is provided with a connecting hole for the pin shaft to penetrate through, and the lower end portion of the pin shaft is provided with a second horizontally-unfolded protruding edge, the extrusion shaft sleeve is arranged at the lower end of the pin shaft in a sleeved mode, and the upper end of the pin shaft is in threaded connection with a second locking nut. Long-strip-shaped pressing strips are clamped and embedded between the extrusion shaft sleeve and the upper clamping plate and between the extrusion shaft sleeve and the lower clamping plate, and the fixing base is further provided with a clamping assembly for clamping the end of the square pipe. According to the square pipe bender, sleeves of different sizes can be rapidly replaced, and square pipes of different models can be bent.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipe bending processing and relates to a square pipe bender. Background Art

[0002] The traditional method of bending metal pipes such as copper pipes, aluminum pipes, and iron pipes from straight pipes into bent pipes is as follows: an arc-shaped channel adapted to the metal pipe is provided in a bending machine, and the metal pipe is clamped by a fixture so that the metal pipe gradually moves along the arc-shaped channel. During the process of the metal pipe moving along the arc-shaped channel, it is converted from a straight pipe into a bent pipe. Although the existing method of bending metal pipes can convert metal pipes from straight pipes into bent pipes, the clamping position of the metal pipe corresponding to the fixture is extremely prone to fracture and damage due to the long-term and large clamping force of the fixture during the bending process. This will affect the product quality of the metal bent pipe. A bender is a special tool for bending metal pipes, which solves the problem of fracture and damage. The existing benders generally fix one end of the metal pipe on one side of a bending disc first, and then clamp the metal pipe by a pressing pipe head that can rotate around the outer ring surface of the bending disc. The pressing pipe head is rotated to bend the metal pipe along the outer ring surface of the bending disc, mainly for bending round pipes. There are few special devices for bending square pipes on the market, and they cannot handle square pipes of different models. Summary of the Utility Model

[0003] The purpose of the present utility model is to address the above problems existing in the prior art and propose a square pipe bender that can quickly replace sleeves of different sizes to bend square pipes of different models.

[0004] The purpose of the present utility model can be achieved by the following technical solutions: A square pipe bender includes a fixed seat, an upper clamping plate, a lower clamping plate, a sleeve, a central shaft, a bearing, a pipe bending rotating arm, a pressing shaft sleeve, and a pin shaft. The fixed seat is in a "U" shape, and a plurality of fixing holes are opened on both sides of the fixed seat. A central hole is opened on the fixed seat. The central shaft passes through the fixed seat, the lower clamping plate, the sleeve, the upper clamping plate, and the bearing from bottom to top in sequence. A convex edge one that expands horizontally is provided at the lower end of the central shaft, and the convex edge one abuts against the bottom of the fixed seat. A threaded section one is provided at the upper end of the central shaft and is threadedly connected with a locking nut one. One end of the pipe bending rotating arm is sleeved outside the bearing, and a connection hole for the pin shaft to pass through is opened at the other end of the pipe bending rotating arm. A convex edge two that expands horizontally is provided at the lower end of the pin shaft. The pressing shaft sleeve is sleeved at the lower end of the pin shaft. A threaded section two is provided at the upper end of the pin shaft and is threadedly connected with a locking nut two. A strip-shaped pressing strip is clamped between the pressing shaft sleeve and the upper clamping plate and the lower clamping plate. A clamping assembly for clamping the end of the square pipe is further provided on the fixed seat.

[0005] Further, both the upper clamping plate and the lower clamping plate are in a disc shape and a step is opened at the edge. The pressing strip abuts against the step. One side of the pressing strip abuts against the step, and the other side of the pressing strip abuts against the side wall of the pressing shaft sleeve.

[0006] Furthermore, a washer 1 sleeved on the central shaft is provided between the bearing and the locking nut 1.

[0007] Furthermore, a second gasket is provided between the extruded sleeve and the bent pipe rotating arm.

[0008] Furthermore, the clamping assembly includes a fixed block, a movable block, a mounting block, a tightening bolt and three locking nuts. The fixed block and the mounting block are fixed to the fixed seat by bolts. The mounting block is provided with a threaded hole, and the tightening bolt is threadedly connected in the threaded hole. The side of the movable block is provided with an extrusion groove for the tightening bolt to pass through. The three locking nuts are sleeved on the tightening bolts and are located between the movable block and the mounting block, and the three locking nuts are abutted against the mounting block.

[0009] Furthermore, a guide rod is fixed on the side of the mounting block, a guide hole is opened on the side of the movable block, and the guide rod is embedded in the guide hole.

[0010] Furthermore, the outer end of the curved pipe rotating arm is fixedly connected to a force adding rod by bolts or welding.

[0011] Pass the square tube through the gap between the pressure strip and the sleeve, let the front end of the square tube be located between the fixed block and the movable block, turn the tightening bolt to push the movable block forward, so that the movable block and the fixed block clamp the square tube together, and further tighten it by turning the locking nut three to abut against the mounting block.

[0012] Insert the square tube between the pressure strip and the sleeve, clamp the front end of the square tube through the clamping assembly, turn the force rod to make the bending arm rotate around the central axis, and the pin drives the extrusion sleeve to apply pressure to the pressure strip, so that the pressure strip rotates around the square tube to complete the bending operation. Perform the bending work of the square tube and manually bend it to a specific angle according to the needs.

[0013] When the height needs to be adjusted, turn the locking nut upwards, take out the washer, bearing, elbow rotating arm and upper clamp, and finally take out the old sleeve, put in a new sleeve with a height matching the square tube, and then install all the parts back. The height of the new sleeve matches the height of the square tube, and the distance between the upper clamp and the lower clamp is changed, which can just clamp the upper and lower end faces of the square tube. Of course, if the width of the square tube changes, you can also replace the sleeve with a different outer diameter to match it.

[0014] Compared with the prior art, this square tube bender has the following advantages:

[0015] 1. Square tubes of different types can be bent, that is, square tubes of different widths and heights can be bent using the Ben Square Tube Bender, just by replacing sleeves of different heights and outer diameters.

[0016] 2. The structure is simple and firm. The bending arm can be easily rotated through the force rod to bend the square tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the square pipe bending tool of the present invention.

[0018] Figure 2 It is a top view of the square pipe bending tool of the present invention.

[0019] In the figure, 1 is a fixed seat; 11 is a fixing hole; 12 is a central hole; 2 is an upper clamping plate; 3 is a lower clamping plate; 23 is a step; 4 is a sleeve; 5 is a central shaft; 51 is a first convex edge; 52 is a first locking nut; 53 is a first threaded section; 6 is a bearing; 7 is a pipe bending rotating arm; 71 is a force applying rod; 8 is an extrusion bushing; 9 is a pin shaft; 91 is a second convex edge; 92 is a second threaded section; 93 is a second locking nut; 10 is a pressing strip; 111 is a first washer; 112 is a second washer; 113 is a fixing block; 114 is a movable block; 115 is a mounting block; 116 is a tightening bolt; 117 is a third locking nut; 118 is an extrusion groove; 119 is a guide rod; 120 is a guide hole; 121 is a square pipe. Detailed implementation manners

[0020] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0021] As Figure 1 shown, the square pipe bender of the present invention includes a fixed seat 1, an upper clamping plate 2, a lower clamping plate 3, a sleeve 4, a central shaft 5, a bearing 6, a pipe bending rotating arm 7, an extrusion bushing 8 and a pin shaft 9. The fixed seat 1 is in a "J" shape. A plurality of fixing holes 11 are opened on both sides of the fixed seat 1, and a central hole 12 is opened on the fixed seat 1. The central shaft 5 sequentially passes through the fixed seat 1, the lower clamping plate 3, the sleeve 4, the upper clamping plate 2 and the bearing 6 from bottom to top. The lower end of the central shaft 5 has a horizontally expanded first convex edge 51, and the first convex edge 51 abuts against the bottom of the fixed seat 1. The upper end of the central shaft 5 has a first threaded section 53 and is threadedly connected with a first locking nut 52.

[0022] One end of the pipe bending rotating arm 7 is sleeved outside the bearing 6. A connecting hole for the pin shaft 9 to pass through is opened at the other end of the pipe bending rotating arm 7. The lower end of the pin shaft 9 has a horizontally expanded second convex edge 91. The extrusion bushing 8 is sleeved on the lower end of the pin shaft 9. The upper end of the pin shaft 9 has a second threaded section 92 and is threadedly connected with a second locking nut 93. A long strip-shaped pressing strip 10 is clamped between the extrusion bushing 8 and the upper clamping plate 2 and the lower clamping plate 3. The outer end of the pipe bending rotating arm 7 is fixedly connected with a force applying rod 71 by bolts or welding. By using the lever principle, the pipe bending rotating arm 7 can be rotated more easily by rotating the force applying rod 71.

[0023] Both the upper clamping plate 2 and the lower clamping plate 3 are in a disc shape and a step 23 is opened at the edge. The pressing strip 10 abuts against the step 23. One side of the pressing strip 10 abuts against the step 23, and the other side of the pressing strip 10 abuts against the side wall of the extrusion bushing 8.

[0024] A washer 111 sleeved on the central shaft 5 is provided between the bearing 6 and the locking nut 52 , and a washer 2 112 is provided between the extrusion sleeve 8 and the elbow rotating arm 7 .

[0025] like Figure 2 As shown, the fixing seat 1 is also provided with a clamping assembly for clamping the end of the square tube 121. The clamping assembly includes a fixing block 113, a movable block 114, a mounting block 115, a jacking bolt 116 and a locking nut 117. The fixing block 113 and the mounting block 115 are both fixed to the fixing seat 1 by bolts. The mounting block 115 is provided with a threaded hole, and the jacking bolt 116 is threadedly connected in the threaded hole. The side of the movable block 114 is provided with an extrusion groove 118 for the jacking bolt 116 to penetrate. The locking nut 117 is sleeved on the jacking bolt 116 and is located between the movable block 114 and the mounting block 115. The locking nut 117 is abutted against the mounting block 115.

[0026] A guide rod 119 is fixed to the side of the mounting block 115 , and a guide hole 120 is opened on the side of the movable block 114 , and the guide rod 119 is embedded in the guide hole 120 .

[0027] Pass the square tube 121 through the gap between the pressure strip 10 and the sleeve 4, so that the front end of the square tube 121 is located between the fixed block 113 and the movable block 114, and rotate the tightening bolt 116 to push the movable block 114 forward, so that the movable block 114 and the fixed block 113 clamp the square tube 121 together, and further tighten it by rotating the locking nut 3 117 to abut against the mounting block 115.

[0028] Insert the square tube 121 between the pressure strip 10 and the sleeve 4, clamp the front end of the square tube 121 by the clamping assembly, rotate the force rod 71, make the bending tube rotating arm 7 rotate around the central axis 5, and the pin 9 drives the extrusion sleeve 8 to apply pressure to the pressure strip 10, so that the pressure strip 10 rotates around the square tube 121, and the bending operation is completed. Perform the bending work of the square tube 121 and manually bend it to a specific angle according to the needs.

[0029] When the height needs to be adjusted, the locking nut 52 is turned upward, the washer 111, the bearing 6, the elbow rotating arm 7 and the upper clamping plate 2 are taken out, and finally the old sleeve 4 is taken out, and a new sleeve 4 with a height matching the square tube 121 is put in, and then all the parts are installed back. The height of the new sleeve 4 matches the height of the square tube 121, and the spacing between the upper clamping plate 2 and the lower clamping plate 3 is changed, which can just clamp the upper and lower end surfaces of the square tube 121. Of course, if the width of the square tube 121 changes, the sleeve 4 with different outer diameters can also be replaced to match.

[0030] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A square tube bender, comprising a fixed seat (1), an upper clamping plate (2), a lower clamping plate (3), a sleeve (4), a central shaft (5), a bearing (6), a tube bending rotating arm (7), an extrusion sleeve (8) and a pin (9), characterized in that: The fixed seat (1) is in a "ji" shape. A number of fixing holes (11) are opened on both sides of the fixed seat (1), and a central hole (12) is opened on the fixed seat (1). The central shaft (5) sequentially passes through the fixed seat (1), the lower clamping plate (3), the sleeve (4), the upper clamping plate (2) and the bearing (6) from bottom to top. The lower end of the central shaft (5) has a horizontally extended first flange (51), and the first flange (51) abuts against the bottom of the fixed seat (1). The upper end of the central shaft (5) has a first threaded section (53) and is threadedly connected with a first locking nut (52). One end of the elbow rotating arm (7) is sleeved outside the bearing (6), and a connecting hole for the pin shaft (9) to pass through is opened at the other end of the elbow rotating arm (7). The lower end of the pin shaft (9) has a horizontally extended second flange (91). The extrusion bushing (8) is sleeved on the lower end of the pin shaft (9). The upper end of the pin shaft (9) has a second threaded section (92) and is threadedly connected with a second locking nut (93). A strip-shaped pressing strip (10) is clamped between the extrusion bushing (8) and the upper clamping plate (2) and the lower clamping plate (3). A clamping assembly for clamping the end of the square pipe (121) is further provided on the fixed seat (1).

2. A square tube bender according to claim 1, characterized in that: Both the upper clamping plate (2) and the lower clamping plate (3) are in a disc shape and have steps (23) at the edges. The pressing strip (10) abuts against the steps (23).

3. A square tube bender according to claim 1, characterized in that: A first washer (111) sleeved on the central shaft (5) is padded between the bearing (6) and the first locking nut (52).

4. A square tube bender according to claim 2 or 3, characterized in that: A second washer (112) is provided between the extrusion bushing (8) and the elbow rotating arm (7).

5. A square tube bender according to claim 1, characterized in that: The clamping assembly includes a fixed block (113), a movable block (114), a mounting block (115), a tightening bolt (116) and a third locking nut (117). Both the fixed block (113) and the mounting block (115) are fixed on the fixed seat (1) by bolts. A threaded hole is opened on the mounting block (115), and the tightening bolt (116) is threadedly connected in the threaded hole. An extrusion groove (118) for the tightening bolt (116) to penetrate into is opened on the side of the movable block (114). The third locking nut (117) is sleeved on the tightening bolt (116) and is located between the movable block (114) and the mounting block (115), and the third locking nut (117) abuts against the mounting block (115).

6. A square tube bender according to claim 5, characterized in that: A guide rod (119) is fixed on the side of the mounting block (115), and a guide hole (120) is opened on the side of the movable block (114). The guide rod (119) is embedded in the guide hole (120).

7. A square tube bender according to claim 6, characterized in that: A force - adding rod (71) is fixedly connected to the outer end of the elbow rotating arm (7) by bolts or welding.

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