A pipe bending machine for automobile brake pipes

Abstract

The application discloses a brake pipe bending machine for automobile, and relates to the technical field of brake pipe bending machines.The brake pipe bending machine comprises a base mechanism, a rotating mechanism, a pipe handle connecting mechanism and a pipe bending die mechanism.Two servo motors are arranged on two load plates to provide power required by the pipe bending die for bending the brake pipe and power required by the pipe bending die for deflecting, so that the brake pipe bending machine has small space and land area and high working efficiency.A composite rotating mechanism composed of a first annular guide rail, a rotating disc, a rotating disc rotating gear, a pipe rotating gear, a second annular guide rail, a pipe rotating disc and a pipe transmission gear ring is arranged on the rear load plate, so that the brake pipe bending machine can realize efficient pipe bending and deflection without complicated engineering tow chains, sensors, air pipes and oil pipes, and the efficiency of pipe bending is improved.The pipe bending mechanism has a compact structure, and interference of engineering tow chains, sensors, air pipes and oil pipes on the brake pipe during pipe bending and deflection is avoided.

Description

Technical Field

[0001] This invention belongs to the field of pipe bending machine technology, and in particular relates to a pipe bending machine for automobile brake pipes. Background Technology

[0002] Automobiles have many pipes, such as fuel tanks, hydraulic pumps, filling valves, accumulators, and service brake valves. These components require brake lines to connect to each other. Due to the complex positional relationship between the pipes, the brake lines need to be bent, which requires a special pipe bending machine.

[0003] Existing pipe bending machines, such as the double-head hydraulic pipe bending machine disclosed in CN209124645U, specifically use guide grooves to reduce the deformation and deflection of the two ends of the pipe during the bending process. However, the length of the guide grooves is limited, and for longer brake pipes, it is still impossible to avoid interference with the brake pipe during the bending process. Another example is a pipe bending machine disclosed in CN100581674C, which specifically uses a bending mechanism and is set to form left, right, up, and down bending groups. It uses a rotating mechanism and first and second longitudinal and transverse moving mechanisms to bend the pipe. Without the pipe needing to rotate on its own, it can bend the pipe into a three-dimensional (3D) angle, achieving the accuracy problem of not generating self-rotation and wobbling. However, the structure of this machine is complex, with many engineering drag chains, sensors, air pipes, and motion mechanisms. The volume and space occupied by the bending head is large, which may cause interference and damage to the pipe during bending.

[0004] Therefore, it can be seen that for products with relatively long automotive brake pipes, the following problems still need to be overcome: (1) The pipe shape of the bending part is relatively complex, and the back bend and U-shaped bend of the pipe will interfere with the equipment; (2) When bending the pipe, the sensor, the circuit and the air pipe need to rotate and move with the mechanism, which can easily cause damage and interference; (3) The head of the bending machine is complex and bulky, and occupies a large space and area, which is not conducive to efficient bending. Therefore, in view of the above problems, this technical solution proposes an automotive brake pipe bending machine. Summary of the Invention

[0005] This invention provides a bending machine for automotive brake pipes. It employs two servo motors mounted on two front and rear carrier plates to provide power to the bending die for bending the brake pipe and to the bending die itself for deflection. This design requires minimal space and floor area, resulting in high efficiency. A composite rotation mechanism located on the rear carrier plate, consisting of a first annular guide rail, a rotating turntable, a turntable rotation gear, a bending rotation gear, a second annular guide rail, a bending turntable, and a bending transmission gear ring, eliminates the need for complex engineering cable chains, sensors, air pipes, and oil pipes. This achieves highly efficient bending and deflection, significantly improving bending efficiency. The bending mechanism is also compact, avoiding the problems associated with engineering cable chains and transmission mechanisms. Sensors, air pipes, and oil pipes interfere with the brake pipe during bending and deflection. The bending and rotation of the bending head are achieved by a bending turntable and a rotating turntable connected to it, respectively. The bending angle can be controlled based on the specific deflection of the turntable's servo motor and the bending servo motor. A detachable bending handle mechanism, consisting of a fixed connecting seat, a connecting handle, a connecting handle, a bending drive gear ring, and bending drive gears, enables rapid switching, combination, and docking, meeting production needs and improving efficiency. Furthermore, the bending handle mechanism eliminates the need for engineering cable chains, sensors, air pipes, oil pipes, etc., further avoiding interference and impact during bending; thus solving the problems in the background technology.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0007] The present invention provides a bending machine for automotive brake pipes, comprising:

[0008] The base mechanism includes a front plate and a rear plate, which are vertically arranged and connected by a side connecting plate. The rear plate has a circular opening on its surface. A vertically upward-facing bent tube rotary servo motor and a turntable rotary servo motor are respectively located on both sides below the spacing. The output end of the bent tube rotary servo motor is connected to a bent tube rotary bevel gear through a bent tube rotary reducer. The output end of the turntable rotary servo motor is connected to a turntable rotary bevel gear through a turntable rotary reducer.

[0009] Rotating mechanism: includes a first annular guide rail coaxially mounted in a circular opening; a rotating disk coaxially rotatably mounted on the first annular guide rail and rear-limited by a rotating gear located at the rear; a bent tube rotating gear coaxially located on the rear side of the rotating gear; a second annular guide rail coaxially located in a limiting groove between the rotating gears; a bent tube rotating disk coaxially fixedly connected to the inner circumference of the rotating gear and rotating and limited by the second annular guide rail; a bent tube transmission gear ring coaxially located on the front side of the bent tube rotating disk; a second transmission gear mounted on the back of the rear carrier plate and drivingly engaging with the bent tube rotating bevel gear; a first transmission gear mounted on the back of the rear carrier plate and drivingly engaging with the rotating bevel gear; and a... Two first double gears are arranged on both sides of the first transmission gear, meshing with a transmission gear and a turntable rotating gear; two second double gears are arranged on both sides of the second transmission gear, meshing with a second transmission gear and a bent tube rotating gear; the bent tube rotating bevel gear meshes with the bevel gear that is part of the second transmission gear within the spacing; the turntable rotating bevel gear meshes with the bevel gear that is part of the first transmission gear within the spacing. In the initial state, the bent tube transmission gear ring, the bent tube turntable, the second annular guide rail, the bent tube rotating gear, the turntable rotating gear, the first annular guide rail, and the rear plate are all provided with upward-facing openings for inserting the brake tube, and a central hole connected to the opening is provided at the axial center of the bent tube turntable for limiting the brake tube.

[0010] The bending tube connecting mechanism is mounted on a rotating turntable and is composed of multiple connecting tubes connected by a fixed connecting seat. The connecting tube is equipped with a connecting shaft, and the inner end meshes with the bending tube transmission gear ring through the bending tube transmission gear. The outer end outputs the first bending tube transmission bevel gear.

[0011] The pipe bending die mechanism is installed on the outer end connecting seat of the outer end of the pipe bending handle mechanism. It outputs power to the pipe bending die to bend the brake pipe through the second pipe bending drive bevel gear that meshes with the first pipe bending drive bevel gear. The pipe bending die is provided with an input channel corresponding to the shaft hole.

[0012] Furthermore, a material-supporting cylinder with a clamp is mounted on the back of the rear plate via a bracket. This cylinder is used to open and close the brake pipe and to lift it. A channel hole is formed at the clamp head for the brake pipe to pass through. The channel hole is coaxially arranged with the axial hole.

[0013] Furthermore, the diameter of the bent tube drive gear ring is smaller than that of the rotating disk.

[0014] Furthermore, the surface of the rotating disk is provided with a passage opening for the brake pipe to pass through.

[0015] Furthermore, the handle tube is fixedly connected to the rotating disk via an inner end connector. In the initial state, the inner end connector is located slightly below the non-passage opening on the rotating disk.

[0016] Furthermore, the front plate is provided with a semi-circular channel hole for the pipe bending handle mechanism to pass through, so that the pipe bending handle mechanism can rotate with the rotating turntable.

[0017] Furthermore, the fixed connecting seat is connected by bolts, and a bearing that rotates with the connecting shaft of the handle is provided in the fixed connecting seat. Adjacent connecting shafts of the handle, the bending tube transmission gear and the connecting shaft of the handle, and the first bending tube transmission bevel gear and the connecting shaft of the handle are respectively connected by pin holes and keyways.

[0018] Furthermore, the first bend-pipe drive bevel gear is mounted on the outer end connecting seat at the front end of the bend-pipe connecting mechanism, the bend-pipe mold is mounted between the first connecting seat and the second connecting seat on the outer end connecting seat by the connecting shaft, and the second bend-pipe drive bevel gear is disposed at the bottom of the bend-pipe mold.

[0019] Furthermore, the input channel is located on the rear side of the second connector and is a groove-shaped channel formed by two protrusions.

[0020] Furthermore, the pipe bending machine also includes a propulsion mechanism for supplying the brake pipe located behind the machine base mechanism.

[0021] The present invention has the following advantages over the prior art:

[0022] (1) The present invention uses two carrier plates arranged in front and behind to install two servo motors to provide the power required for the bending mold to bend the brake pipe and the power required for the overall deflection of the bending mold during bending. It requires little space and occupies a small area, and has high working efficiency.

[0023] (2) The present invention uses a composite rotating mechanism located on the rear plate, consisting of a first annular guide rail, a rotating turntable, a turntable rotating gear, a pipe bending rotating gear, a second annular guide rail, a pipe bending turntable, and a pipe bending transmission gear ring arranged coaxially. This mechanism eliminates the need for complex engineering drag chains, sensors, air pipes, oil pipes, etc., and can achieve efficient pipe bending and deflection actions, greatly improving the efficiency of pipe bending. The pipe bending mechanism is ingenious and avoids interference caused by engineering drag chains, sensors, air pipes, oil pipes, etc. when the brake pipe is bent and deflected.

[0024] (3) The bending and rotation of the bending head of the present invention are realized by bending turntable, rotating turntable and their connection structure, respectively. The bending angle can be controlled according to the specific deflection of the turntable rotation servo motor and the bending rotation servo motor.

[0025] (4) The present invention has a detachable pipe bending handle mechanism consisting of a fixed connecting seat, a connecting handle tube, a connecting handle, a pipe bending transmission gear ring, and a pipe bending transmission gear. This mechanism enables rapid switching, combination, and docking, which can meet production needs and improve efficiency. Furthermore, the pipe bending handle mechanism does not require the installation of engineering drag chains, sensors, air pipes, oil pipes, or other structures to further avoid interference and influence during pipe bending.

[0026] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a pipe bending machine for automobile brake pipes according to the present invention;

[0029] Figure 2 for Figure 1 A schematic diagram of the structure from the perspective of A;

[0030] Figure 3 for Figure 1 A structural diagram from the perspective of B;

[0031] Figure 4 for Figure 1 A structural diagram from a C-angle perspective;

[0032] Figure 5 To hide the detailed diagram of the rotating mechanism behind the rotating turntable;

[0033] Figure 6 for Figure 1 Vertical cross-sectional view of the structure;

[0034] Figure 7 for Figure 1 A schematic diagram of the combination of the pipe bending handle mechanism and the pipe bending die mechanism;

[0035] Figure 8 for Figure 7 Vertical cross-sectional view of the structure

[0036] The attached diagram lists the components represented by each number as follows:

[0037] 1-Rear plate, 101-Side connecting plate, 2-Front plate, 3-Turntable rotary servo motor, 301-Turntable rotary reducer, 302-Turntable rotary bevel gear, 303-First transmission gear, 304-First double gear, 4-Bent tube rotary servo motor, 401-Bent tube rotary reducer, 402-Bent tube rotary bevel gear, 403-Second transmission gear, 404-Second double gear, 5-Turntable, 501-First annular guide rail, 502-Second annular guide rail, 6-Handle connecting tube, 601-Fixed connection 602-Outer end connecting seat, 603-First bend pipe drive bevel gear, 604-First connecting seat, 605-Bend pipe mold, 606-Second bend pipe drive bevel gear, 607-Second connecting seat, 608-Inner end connecting seat, 609-Bend pipe drive gear, 610-Handle connecting shaft, 611-Input channel, 7-Material support cylinder, 701-Channel hole, 8-Bend pipe rotating gear, 801-Bend pipe turntable, 802-Bend pipe drive gear ring, 803-Shaft hole, 9-Turntable rotating gear, 10-Brake supply pipe. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be understood that the terms "side", "vertical", "surface", "below", "output end", "coaxial", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0040] Please see Figure 1-8 As shown, a bending machine for automotive brake pipes according to the present invention includes:

[0041] The base mechanism includes a front plate 2 and a rear plate 1, which are vertically arranged and connected at a distance from the side connecting plate 101. The rear plate 1 has a circular opening on its surface. A vertically upward-facing bent tube rotary servo motor 4 and a turntable rotary servo motor 3 are respectively located on both sides below the distance. The output end of the bent tube rotary servo motor 4 is connected to a bent tube rotary bevel gear 402 through a bent tube rotary reducer 401. The output end of the turntable rotary servo motor 3 is connected to a turntable rotary bevel gear 302 through a turntable rotary reducer 301.

[0042] Rotating mechanism: includes a first annular guide rail 501 coaxially mounted in a circular opening; a rotating disk 5 coaxially rotatably mounted on the first annular guide rail 501 and rear-limited by a rotating disk gear 9 located at the rear; a bent tube rotating gear 8 coaxially located on the rear side of the rotating disk gear 9; a second annular guide rail 502 coaxially located in a limiting groove between the rotating disk gear 9 and the rotating disk gear 9; a bent tube rotating disk 801 coaxially fixedly connected to the inner circumference of the rotating disk gear 9 and rotatably limited by the second annular guide rail 502; a bent tube transmission gear ring 802 coaxially located on the front side of the bent tube rotating disk 801; a second transmission gear 403 mounted on the back of the rear carrier plate 1 and in transmission cooperation with the bent tube rotating bevel gear 402; a first transmission gear 303 mounted on the back of the rear carrier plate 1 and in transmission cooperation with the rotating disk bevel gear 302; and a gear meshing with the first transmission gear 303 and the rotating disk gear 9 and located at the first transmission gear 303. Two first double gears 304 arranged on both sides of 03, two second double gears 404 meshing with the second transmission gear 403 and the bent tube rotating gear 8 and located on both sides of the second transmission gear 403, the bent tube rotating bevel gear 402 meshing with the bevel gear of the second transmission gear 403 within the distance, the turntable rotating bevel gear 302 meshing with the bevel gear of the first transmission gear 303 within the distance; in the initial state, the bent tube transmission gear ring 802, the bent tube turntable 801, the second annular guide rail 502, the bent tube rotating gear 8, the turntable rotating gear 9, the first annular guide rail 501, and the rear plate 1 are all provided with upward-facing openings for inserting the brake tube 10, and a central hole 803 connected to the opening is provided at the axial position of the bent tube turntable 801 for limiting the brake tube 10; the diameter of the bent tube transmission gear ring 802 is smaller than that of the rotating turntable 5; the surface of the rotating turntable 5 has a passage opening for the brake tube 10 to pass through.

[0043] The bending tube connecting mechanism is installed on the rotating turntable 5 and is formed by connecting multiple connecting tubes 6 through a fixed connecting seat 601. The connecting tube 6 is provided with a connecting shaft 610, and the inner end meshes with the bending tube transmission gear ring 802 through the bending tube transmission gear 609, and the outer end outputs the first bending tube transmission bevel gear 603.

[0044] The pipe bending die mechanism is installed on the outer end connecting seat 602 at the outer end of the pipe bending handle mechanism. It outputs power to the pipe bending die 605 to perform the bending action on the brake pipe 10 through the second pipe bending drive bevel gear 606 that meshes with the first pipe bending drive bevel gear 603. An input channel 611 corresponding to the shaft hole 803 is provided on the pipe bending die 605.

[0045] like Figure 1-4As shown in this specific embodiment, only one section of the brake tube 10 located on the bending die mechanism is shown. The subsequent part is not shown. Specifically, it extends backward through the axial hole 803 and the channel hole 701.

[0046] Among them, the back of the rear plate 1 is equipped with a material support cylinder 7 with a clamp for opening and closing clamping and lifting the brake tube 10. The clamp head forms a channel hole 701 for the brake tube 10 to pass through, and the channel hole 701 is coaxially arranged with the shaft hole 803.

[0047] The handle tube 6 and the rotating disk 5 are fixedly connected by an inner end connector 608. In the initial state, the inner end connector 608 is located at a position slightly below the non-passage opening on the rotating disk 5.

[0048] The front plate 2 has a semi-circular channel hole for the pipe bending handle mechanism to pass through, so that the pipe bending handle mechanism can rotate with the rotating turntable 5.

[0049] The fixed connecting seat 601 is bolted together, and a bearing that rotatably engages with the connecting shaft 610 is located within the fixed connecting seat 601. Adjacent connecting shafts 610, the bent tube transmission gear 609 and the connecting shaft 610, and the first bent tube transmission bevel gear 603 and the connecting shaft 610 are respectively connected by pin holes and keyways. The pin hole and keyway connection structure is existing technology and can be referenced. Figure 7-8 The structure, by setting the handle tube 6 and the handle connecting shaft 610 into multiple segments and connecting them based on the pin hole and keyway connection structure, can realize the rapid switching and combination between handles to meet production needs and improve efficiency (one end of the handle connecting shaft is a gear, and the other end is a boss plus keyway form, which facilitates rapid docking).

[0050] The first bend-tube drive bevel gear 603 is mounted on the outer end connecting seat 602 at the front end of the bend-tube handle mechanism. The bend-tube mold 605 is mounted on the outer end connecting seat 602 between the first connecting seat 604 and the second connecting seat 607 via a connecting shaft. The second bend-tube drive bevel gear 606 is located at the bottom of the bend-tube mold 605.

[0051] The input channel 611 is located behind the second connector 607 and is a groove-shaped channel formed by two protrusions, through which the brake pipe 10 passes.

[0052] The pipe bending machine also includes a propulsion mechanism located behind the base mechanism for supplying the brake pipe 10; this propulsion mechanism can adopt an existing structure, which is existing technology and is not within the scope of protection of this technical solution, so it will not be described in detail in this specific embodiment.

[0053] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A bending machine for automotive brake pipes, characterized in that, include: The base mechanism includes a front plate (2) and a rear plate (1) formed by the side connecting plate (101) and connected at a distance from each other and arranged vertically. The rear plate (1) has a circular opening on its surface. A vertically upward-facing bent tube rotary servo motor (4) and a turntable rotary servo motor (3) are respectively located on both sides below the connecting plate (101). The output end of the bent tube rotary servo motor (4) is connected to a bent tube rotary bevel gear (402) through a bent tube rotary reducer (401). The output end of the turntable rotary servo motor (3) is connected to a turntable rotary bevel gear (302) through a turntable rotary reducer (301). Rotating mechanism: includes a first annular guide rail (501) coaxially mounted in a circular opening, a rotating disk (5) coaxially rotatably mounted on the first annular guide rail (501) and rear-limited by a rotating gear (9) located at the rear, a bent tube rotating gear (8) coaxially located on the rear side of the rotating gear (9), a second annular guide rail (502) coaxially located in a limiting groove between the bent tube rotating gear (8) and the rotating gear (9), and a rotating disk fixedly connected to the rotating disk. The rotating gear (9) has an inner circumference and a bending tube turntable (801) that rotates and limits the rotation of the second annular guide rail (502). A bending tube transmission gear ring (802) is coaxially located on the front side of the bending tube turntable (801). A second transmission gear (403) is mounted on the back of the rear carrier plate (1) and drives the bending tube rotating bevel gear (402). A first transmission gear (303) is mounted on the back of the rear carrier plate (1) and drives the turntable rotating bevel gear (302). The first transmission gear (303) is connected to the first transmission gear (303). Two first double gears (304) meshing with the turntable rotating gear (9) and located on both sides of the first transmission gear (303), two second double gears (404) meshing with the second transmission gear (403) and the bent tube rotating gear (8) and located on both sides of the second transmission gear (403), the bent tube rotating bevel gear (402) meshing with the bevel gear inherent to the second transmission gear (403) within the spacing, the turntable rotating bevel gear (302) meshing with the first transmission gear (303) 03) The bevel gears within the spacing mesh with each other; in the initial state, the bend tube transmission gear ring (802), bend tube turntable (801), second annular guide rail (502), bend tube rotating gear (8), turntable rotating gear (9), first annular guide rail (501), and rear plate (1) are all provided with upward-facing openings for inserting the brake tube (10), and the axial center of the bend tube turntable (801) is provided with a central hole (803) connected to the opening for limiting the brake tube (10); The bending tube connecting mechanism is installed on the rotating turntable (5) and is formed by connecting multiple sections of connecting tube (6) through a fixed connecting seat (601). The connecting tube (6) is provided with a connecting shaft (610), and the inner end meshes with the bending tube transmission gear ring (802) through the bending tube transmission gear (609), and the outer end outputs the first bending tube transmission bevel gear (603). The pipe bending die mechanism is installed on the outer end connecting seat (602) at the outer end of the pipe bending handle mechanism. The second pipe bending drive bevel gear (606) meshes with the first pipe bending drive bevel gear (603) to output power to the pipe bending die (605) to bend the brake pipe (10). An input channel (611) corresponding to the shaft hole (803) is provided on the pipe bending die (605).

2. The bending machine for automotive brake pipes according to claim 1, characterized in that, The back of the rear plate (1) is equipped with a support cylinder (7) with a clamp for opening and closing clamping and lifting the brake tube (10). A channel hole (701) for the brake tube (10) to pass through is formed at the clamp head. The channel hole (701) is coaxially arranged with the shaft hole (803).

3. A pipe bending machine for automotive brake pipes according to claim 1, characterized in that, The diameter of the bend drive gear ring (802) is smaller than that of the rotating disk (5).

4. A pipe bending machine for automotive brake pipes according to claim 1, characterized in that, The rotating turntable (5) has an opening on its surface for the brake pipe (10) to pass through.

5. A pipe bending machine for automotive brake pipes according to claim 4, characterized in that, The handle tube (6) and the rotating disk (5) are fixedly connected by an inner end connector (608). In the initial state, the inner end connector (608) is located at a position slightly below the non-passage opening on the rotating disk (5).

6. A pipe bending machine for automotive brake pipes according to claim 1, characterized in that, The front plate (2) has a semi-circular channel hole for the pipe bending handle mechanism to pass through, so that the pipe bending handle mechanism can rotate with the rotating turntable (5).

7. A pipe bending machine for automotive brake pipes according to claim 1, characterized in that, The fixed connecting seat (601) is bolted together, and a bearing is provided in the fixed connecting seat (601) to rotate with the connecting shaft (610). The adjacent connecting shafts (610), the bent tube transmission gear (609) and the connecting shaft (610), and the first bent tube transmission bevel gear (603) and the connecting shaft (610) are respectively connected by pin holes and keyway connection structures.

8. A pipe bending machine for automotive brake pipes according to claim 1, characterized in that, The pipe bending mold (605) is mounted between a first connecting seat (604) and a second connecting seat (607) on an outer end connecting seat (602) via a connecting shaft, and a second pipe bending transmission bevel gear (606) is located at the bottom of the pipe bending mold (605).

9. A pipe bending machine for automotive brake pipes according to claim 1, characterized in that, The input channel (611) is located behind the second connector (607) and is a groove-shaped channel formed by two protrusions.

10. A pipe bending machine for automotive brake pipes according to claim 1, characterized in that, The pipe bending machine also includes a propulsion mechanism located behind the base mechanism for supplying the brake pipe (10).

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