Pipe bending machine

Abstract

A pipe bending machine comprises a working table, a first pipe bending die arranged on the left portion of the working table and a second pipe bending die arranged in the middle of the working table, the second pipe bending die is installed on a guide seat, the guide seat is arranged on the working table in a sliding mode, and a lead screw mechanism is used for providing power. The lead screw mechanism comprises a nut seat fixed to the workbench, a lead screw nut rotationally installed in the nut seat and a lead screw installed in the middle of the lead screw nut, one end of the lead screw is connected with the guide seat, and the lead screw nut is connected with the motor through a chain wheel transmission assembly. A first die groove is machined in the outer circumference of the first pipe bending die, a second die groove is correspondingly machined in the outer circumference of the second pipe bending die, and the first die groove and the second die groove are matched with each other in the die assembly process to bend a pipe fitting. According to the pipe bending machine structure, the second pipe bending die is arranged to be a movable die, the second pipe bending die is installed on the guide base, power is provided through the lead screw mechanism, hydraulic oil cylinder pushing in the prior art is replaced, the overall structure is simplified, and the lead screw mechanism can more accurately control the linear movement distance of the guide base.

Description

Technical Field

[0001] The utility model relates to a pipe bending machine. Background Art

[0002] In the field of mechanics, pipe bending machines are widely used to bend various pipe fittings so that the pipe fittings have the shape required by the design or the pipe fittings can be connected smoothly. The commonly used pipe bending machines now usually include: a hydraulic system, a motor that controls the hydraulic pressure entering the hydraulic cylinder, a pipe bending mechanism (or a pipe bending mold), and a relay. In the process of bending, after the position of the mold is adjusted in advance, the pipe fitting is placed in the pipe bending mold for the pipe bending operation. However, in the above-mentioned bending operation of the pipe fitting, due to the use of the relay to limit the time, when the pipe fitting has some defects or unstable factors occur during the bending operation, it is easy to cause the degree of bending to be insufficient or excessive bending and the bending amplitude to be too large, so that the bending operation of the pipe fitting does not meet the design requirements, thereby greatly reducing the yield rate in the pipe fitting manufacturing process. At the same time, since the pipe bending machines currently used use a hydraulic pump to control the pressure of the pipe bending mold on the pipe fitting, and drive the pipe bending mechanism through a relay to perform the pipe bending operation within a certain period of time, even if the fluid flowing into the hydraulic cylinder has reached a sufficient pressure to perform the pipe bending operation, the motor will still rotate at a certain speed and will not stop. Moreover, if the pipe bending mold completes the pipe bending operation prematurely, the pipe bending mold cannot stop bending or return to its original state, resulting in a waste of resources and unnecessary wear of the machine, and increasing production costs. Utility Model Content

[0003] In view of the shortcomings existing in the above problems, the utility model provides a pipe bending machine.

[0004] To achieve the above object, the utility model provides a pipe bending machine, comprising a workbench, a first pipe bending die arranged on the left part of the workbench, and a second pipe bending die arranged in the middle part of the workbench, wherein the second pipe bending die is installed on a guide seat, and the guide seat is slidably connected to the workbench through a slide rail assembly, and the guide seat is powered by a screw mechanism;

[0005] The screw mechanism includes a nut seat fixedly connected to the workbench, a screw nut rotatably installed in the nut seat, and a screw installed in the middle of the screw nut. The screw nut is axially processed with an internal threaded hole I to match the screw, one end of the screw is connected to the guide seat, and the screw nut is connected to the motor through a sprocket transmission assembly.

[0006] A first die groove is processed at the outer circumference of the first tube bending die, and a second die groove is correspondingly processed at the outer circumference of the second tube bending die. The first die groove and the second die groove cooperate with each other to bend the pipe fitting during the mold closing process.

[0007] As a further improvement of the utility model, the sprocket transmission assembly includes a driven sprocket installed coaxially with the screw nut and a driving sprocket arranged at the end of the motor main shaft, and the driving sprocket is connected to the driven sprocket through a transmission chain.

[0008] As a further improvement of the utility model, a multi-stage speed regulator is provided between the motor and the driving sprocket.

[0009] As a further improvement of the utility model, the guide seat is U-shaped, the second pipe bending die is installed between the upper and lower walls of the guide seat by positioning bolts, the second pipe bending dies are arranged in pairs, the positioning bolts pass through the second pipe bending dies from top to bottom and are threadedly connected to the lower part of the guide seat, the lower part of the guide seat is correspondingly processed with an internal threaded hole, and a sleeve is provided between the positioning bolts and the second pipe bending die.

[0010] As a further improvement of the present invention, a mounting ear is provided on the side wall of the guide seat facing the screw rod, and the screw rod is connected to the mounting ear for positioning.

[0011] As a further improvement of the utility model, the slide rail assembly includes slide rails symmetrically installed on the workbench front and back, and sliders arranged on both sides of the guide seat.

[0012] As a further improvement of the utility model, the nut seat includes a positioning seat installed on the workbench, the screw nut passes through the positioning seat horizontally and is positioned by the bearing seat, a bearing is provided between the bearing seat and the screw nut, a limiting bolt is radially installed on the upper part of the positioning seat, an annular limiting groove is formed on the outer circumference of the middle part of the screw nut, and the lower part of the limiting bolt extends into the annular limiting groove.

[0013] As a further improvement of the utility model, a base is fixedly provided on the left part of the workbench, a positioning rod is provided at the center of the upper part of the base, and the first pipe bending mold is sleeved on the positioning rod and locked in place by a locking nut.

[0014] The beneficial effects of the utility model are:

[0015] 1. The second bending die is set as a movable die in the structure of the pipe bending machine. The second bending die is installed on the guide seat and powered by a screw mechanism, replacing the hydraulic cylinder in the prior art, simplifying the overall structure. The screw mechanism can more accurately control the linear moving distance of the guide seat;

[0016] 2. By controlling the multi-stage speed regulator, the movement speed of the second bending die can be conveniently controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of a pipe bending machine of the utility model;

[0018] Figure 2 This is a top view of a pipe bending machine of the utility model;

[0019] Figure 3 for Figure 2 Middle AA section view;

[0020] Figure 4 for Figure 2 Middle BB section view;

[0021] Figure 5 The utility model is a working schematic diagram of a pipe bending machine.

[0022] In the figure: 1. workbench; 2. base; 21. positioning rod; 22. locking nut; 3. first bending tube mold; 31. first die groove; 4. pipe fitting; 5. second bending tube mold; 51. second die groove; 52. bushing; 53. positioning bolt; 6. guide seat; 61. mounting ear; 62. internal threaded hole; 7. slide rail assembly; 71. slide rail; 72. slider; 8. screw rod; 9. sprocket transmission assembly; 91. driven sprocket; 92. transmission chain; 93. driving sprocket; 10. screw rod nut; 101. internal threaded hole I; 102. annular limit groove; 11. nut seat; 111. positioning seat; 112. bearing seat; 113. bearing; 114. limit bolt; 12. motor; 13. multi-stage speed regulator. DETAILED DESCRIPTION

[0023] like Figure 1 , Figure 2 As shown, a pipe bending machine described in the utility model includes a workbench 1, a first pipe bending die 3 arranged on the left part of the workbench 1, and a second pipe bending die 5 arranged in the middle part of the workbench 1. A base 2 is fixedly arranged on the left part of the workbench 1, and a positioning rod 21 is arranged at the center of the upper part of the base 2. The first pipe bending die 3 is sleeved on the positioning rod 21 and is locked and positioned by a locking nut 22. The second pipe bending die 5 is installed on a guide seat 6, and the guide seat 6 is slidably connected to the workbench 1 through a slide rail assembly 7. The slide rail assembly 7 includes a slide rail 71 symmetrically installed on the workbench 1, and a slide rail 71 arranged on the guide seat 6. The guide seat 6 is provided with a slider 72 on both sides of the seat 6, and the guide seat 6 is powered by a screw mechanism. The guide seat 6 is U-shaped, and the second bending tube die 5 is installed between the upper and lower walls of the guide seat 6 by a positioning bolt 53. The second bending tube die 5 is arranged in pairs, and the positioning bolt 53 passes through the second bending tube die 5 from top to bottom and is threadedly connected with the lower part of the guide seat 6. The lower part of the guide seat 6 is processed with an internal threaded hole 62 accordingly, and a shaft sleeve 52 is provided between the positioning bolt 53 and the second bending tube die 5. The side wall of the guide seat 6 facing the screw rod 8 is provided with a mounting ear 61, and the screw rod 8 is connected and positioned with the mounting ear 61 (see Figure 3 );

[0024] The screw mechanism includes a nut seat 11 fixedly connected to the workbench 1, a screw nut 10 rotatably installed in the nut seat 11, and a screw 8 installed in the middle of the screw nut 10. The screw nut 10 is axially processed with an internal threaded hole I101 to match the screw 8. The nut seat 11 includes a positioning seat 111 installed on the workbench 1. The screw nut 10 passes through the positioning seat 111 horizontally and is positioned by a bearing seat 112. A bearing 113 is provided between the bearing seat 112 and the screw nut 10. A limiting bolt 114 is radially installed on the upper part of the positioning seat 111. An annular limiting groove 102 is formed on the outer circumference of the middle part of the screw nut 10, and the lower part of the limiting bolt 114 extends into the annular limiting groove 102 (see Figure 4 ), one end of the screw rod 8 is connected to the guide seat 6, the screw rod nut 10 is connected to the motor 12 through the sprocket transmission assembly 9, the sprocket transmission assembly 9 includes a driven sprocket 91 coaxially installed with the screw rod nut 10, and a driving sprocket 93 arranged at the end of the main shaft of the motor 12, the driving sprocket 93 is connected to the driven sprocket 91 through a transmission chain 92, the motor 12 is arranged below the workbench 1, and a multi-stage speed regulator 13 is also arranged between the motor 12 and the driving sprocket 93;

[0025] A first die groove 31 is processed at the outer circumference of the first tube bending die 3 , and a second die groove 51 is correspondingly processed at the outer circumference of the second tube bending die 5 . The first die groove 31 and the second die groove 51 cooperate with each other to bend the pipe 4 during the mold closing process.

[0026] In the structure of the pipe bending machine, a second pipe bending die is arranged as a movable die. The second pipe bending die is mounted on a guide seat and powered by a screw mechanism, replacing the hydraulic cylinder push in the prior art, thereby simplifying the overall structure. The screw mechanism can more accurately control the linear moving distance of the guide seat; by controlling the multi-stage speed regulator, the movement speed of the second pipe bending die can be conveniently controlled.

[0027] In order to facilitate the understanding of the present invention, the following description is given in conjunction with the accompanying drawings during specific use;

[0028] During operation, the pipe fitting is placed in the first die groove of the first pipe bending die, the motor starts to drive the driving sprocket to rotate through the multi-stage speed regulator, the driving sprocket drives the driven sprocket to rotate synchronously through the transmission chain, and the lead screw nut coaxially installed with the driven sprocket rotates together, the lead screw nut is installed in the nut seat to form an axial limit through the limit screw, the rotational motion of the lead screw nut is converted into the linear motion of the lead screw, the guide seat connected to the end of the lead screw moves to the left along the slide rail assembly under the push of the lead screw, the second pipe bending die installed on the guide seat moves to the left synchronously and approaches the first pipe bending die, the second die groove on the second pipe bending die and the first die groove are close to each other to bend the pipe fitting (see Figure 5 ), after the bending is completed, the motor rotates in the opposite direction, the screw drives the guide seat to move right, and the pipe can be taken out.

[0029] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A pipe bending machine, characterized in that: The invention comprises a workbench (1), a first pipe bending die (3) arranged at the left part of the workbench (1), and a second pipe bending die (5) arranged at the middle part of the workbench (1); the second pipe bending die (5) is installed on a guide seat (6); the guide seat (6) is slidably connected to the workbench (1) via a slide rail assembly (7); and the guide seat (6) is powered by a screw mechanism; The screw mechanism comprises a nut seat (11) fixedly connected to the workbench (1), a screw nut (10) rotatably mounted in the nut seat (11), and a screw (8) mounted in the middle of the screw nut (10); the screw nut (10) is axially processed with an internal threaded hole I (101) matching the screw (8); one end of the screw (8) is connected to the guide seat (6); and the screw nut (10) is connected to the motor (12) via a sprocket transmission assembly (9); The first tube bending die (3) is machined with a first die groove (31) at the outer circumference, and the second tube bending die (5) is correspondingly machined with a second die groove (51) at the outer circumference. The first die groove (31) and the second die groove (51) cooperate with each other during the mold closing process to bend the tube (4).

2. A pipe bending machine according to claim 1, characterized in that: The sprocket transmission assembly (9) comprises a driven sprocket (91) coaxially mounted with the screw nut (10), and a driving sprocket (93) arranged at the end of the main shaft of the motor (12), wherein the driving sprocket (93) is connected to the driven sprocket (91) via a transmission chain (92).

3. A pipe bending machine according to claim 2, characterized in that: A multi-stage speed regulator (13) is also provided between the motor (12) and the driving sprocket (93).

4. A pipe bending machine according to claim 1, characterized in that: The guide seat (6) is U-shaped, and the second pipe bending die (5) is installed between the upper and lower walls of the guide seat (6) by means of positioning bolts (53). The second pipe bending dies (5) are arranged in pairs, and the positioning bolts (53) pass through the second pipe bending dies (5) from top to bottom and are threadedly connected to the lower part of the guide seat (6). The lower part of the guide seat (6) is correspondingly processed with an internal threaded hole (62), and a shaft sleeve (52) is provided between the positioning bolts (53) and the second pipe bending die (5).

5. A pipe bending machine according to claim 1, characterized in that: A mounting ear (61) is provided on the side wall of the guide seat (6) facing the screw rod (8), and the screw rod (8) is connected to the mounting ear (61) for positioning.

6. A pipe bending machine according to claim 1, characterized in that: The slide rail assembly (7) comprises a slide rail (71) symmetrically mounted on the workbench (1) in a front-to-rear manner, and a slide block (72) disposed on both sides of the guide seat (6).

7. A pipe bending machine according to claim 1, characterized in that: The nut seat (11) comprises a positioning seat (111) mounted on the workbench (1); the screw nut (10) is positioned by a bearing seat (112) after passing through the positioning seat (111) transversely; a bearing (113) is provided between the bearing seat (112) and the screw nut (10); a limiting bolt (114) is radially installed on the upper part of the positioning seat (111); an annular limiting groove (102) is machined on the outer circumference of the middle part of the screw nut (10); and the lower part of the limiting bolt (114) extends into the annular limiting groove (102).

8. A pipe bending machine according to claim 1, characterized in that: A base (2) is fixedly provided on the left side of the workbench (1), a positioning rod (21) is provided at the center of the upper part of the base (2), and the first pipe bending die (3) is sleeved on the positioning rod (21) and locked in place by a locking nut (22).

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