A tube bending mandrel assembly and method of using same

Abstract

A pipe bending mandrel assembly includes: a support assembly; the support assembly is composed of several double universal joints connected in series, but not connected end to end, and each adjacent double universal joint is fixedly connected; several ball bearings are rolled in all directions on the outer side of the double fork of each double universal joint, and distributed on the outer side of the double fork; the present invention ensures the integrity of the internal space of the pipe during the bending process of the pipe bending machine through the support assembly, and does not cause deformation or shrinkage of the internal space of the pipe due to bending, thereby reducing the impact on subsequent construction.

Description

Technical Field

[0001] This invention relates to the field of pipe bending technology, and in particular to a pipe bending mandrel assembly and its method of use. Background Technology

[0002] A pipe bending machine is a device used to bend pipe fittings, and it is broadly classified into CNC pipe bending machines and hydraulic pipe bending machines. Chinese invention patent CN115515731A proposes a mandrel for a pipe bending machine. This mandrel, through the hinges between several hinge elements, extends deep into the pipe to provide support. However, during the bending process, although each hinge element provides support within the pipe, gaps exist between them. During bending, the pipe fitting may dent at the gaps between two adjacent hinge elements, resulting in unsatisfactory bending results and potentially causing the hinge elements to scratch the inner wall of the pipe fitting, as shown in the attached diagram. Figure 7 As shown; To address this, the present invention proposes a pipe bending mandrel assembly and its usage method, which can effectively prevent internal dents from occurring at pipe bends and scratches on the inner wall of the pipe during the pipe bending process. Summary of the Invention

[0003] The technical solution used in this invention is: a bending mandrel assembly, comprising: a support assembly; The support assembly is chain-shaped and consists of several double universal joints connected in series, with each adjacent double universal joint being fixedly connected; each double universal joint has several ball bearings mounted on the outer side of its double fork, which are distributed on the outer side of the double fork.

[0004] Furthermore, the balls are mounted on the double fork in a circular array for omnidirectional rolling.

[0005] Furthermore, it also includes: a drive mechanism; a flexible shaft is fixedly installed on the double universal joint at one end of the support component; the output end of the drive mechanism is fixedly connected to the flexible shaft, and the drive mechanism is used to drive the flexible shaft to rotate and drive the support component to move.

[0006] Furthermore, the drive mechanism includes: a telescopic cylinder and a controller; a drive motor is fixedly installed at the output end of the telescopic cylinder, and the output shaft of the drive motor is fixedly connected to the flexible shaft; both the telescopic cylinder and the drive motor are electrically connected to the controller.

[0007] Furthermore, a tension spring is provided on the double universal joint at the other end of the support assembly.

[0008] Furthermore, it also includes: a top cover; the top cover is located on the outside of one end of the pipe and is elastically connected to the double universal joint via the tension spring.

[0009] A method for using a bent pipe mandrel assembly, the method comprising the following steps: S1. Place the support assembly into the pipe to be bent; S2. Place the pipe fitting at the output end of the pipe bending machine and fix the telescopic cylinder to the pipe bending machine; S3. Start the telescopic cylinder and drive motor, and start the pipe bending machine; during the bending process, the support component rotates at the bending position and slides along the axial direction, forming dynamic support for the inside of the pipe.

[0010] Furthermore, the sliding direction of the support component is either unidirectional sliding or reciprocating sliding.

[0011] Since the present invention adopts the above-mentioned technical solution, the beneficial effects of the present invention are as follows: the present invention, through the support component, ensures the integrity of the internal space of the pipe during the bending process of the pipe, and will not cause deformation or shrinkage of the internal space of the pipe due to bending, thereby reducing the impact on subsequent construction. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0013] Figure 2 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A in the middle.

[0014] Figure 3 This is a schematic diagram showing the relationship between the present invention and the position of the pipe fittings during use.

[0015] Figure 4 This is a schematic cross-sectional view of the inside of the pipe fitting used in this invention.

[0016] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point B.

[0017] Figure 6 This is a schematic diagram of the connection relationship of the double universal joint components of the present invention.

[0018] Figure 7 This is a schematic diagram of an existing fixed support mechanism.

[0019] Reference numerals: Drive mechanism-1; Support assembly-3; Flexible shaft-4; Tension spring-5; Top cover-6; Pipe fitting-7; Telescopic cylinder-11; Drive motor-12; Double universal joint-31; Ball bearing-32; Double fork-311. Detailed Implementation

[0020] Examples, such as Figure 1-6 As shown, a bending mandrel assembly includes: a support assembly 3; The support assembly 3 is chain-shaped, with each adjacent double universal joint 31 fixedly connected to form a support member that is not connected head to tail and can swing in all directions, thereby supporting the inner wall of the pipe fitting; multiple balls 32 are rolled in all directions on the outer side of the double fork 311 of each double universal joint 31, and are distributed on the outer side of the double fork 311; the balls 32 are rolled in all directions on the double fork 311 in a circular array; before bending the pipe fitting 7, the support assembly 3 is inserted into the inside of the pipe fitting 7 to support the inside of the pipe support during the bending process of the pipe bending machine.

[0021] Specifically, in order to prevent the ball bearings 32 from scratching the inner wall of the pipe during the bending process, a small amount of lubricating oil is added to the pipe before bending to prevent scratching the inner wall.

[0022] Specifically, such as Figure 4 As shown, a flexible shaft 4 is fixedly installed on the double universal joint 31 at one end of the support component 3; the output end of the drive mechanism 1 is fixedly connected to the flexible shaft 4, and the drive mechanism 1 is used to drive the flexible shaft 4 to rotate and drive the support component 3 to move; the drive mechanism 1 includes: a telescopic cylinder 11 and a controller; a drive motor 12 is fixedly installed on the output end of the telescopic cylinder 11, and the output shaft of the drive motor 12 is fixedly connected to the flexible shaft 4; both the telescopic cylinder 11 and the drive motor 12 are electrically connected to the controller; the telescopic cylinder 11 is a cylinder and is connected to the pneumatic device in the factory area; before the pipe bending machine starts bending the pipe 7, the telescopic cylinder 11 and the drive motor 12 are started at the same time, and the support component 3 is driven to rotate through the flexible shaft 4 and reciprocate inside the pipe 7 to be bent, so that each point in the inner wall of the pipe 7 can be intermittently supported during the bending process, so as to achieve a better support effect.

[0023] Specifically, a tension spring 5 is provided on the double universal joint 31 at the other end of the support assembly 3, and the top cover 6 is located on the outside of one end of the pipe and is elastically connected to the double universal joint 31 through the tension spring 5. After the support assembly 3 is inserted into the pipe 7 to be bent, the two ends of the tension spring 5 are fixedly connected to the double universal joint 31 and the top cover 6 at the end, respectively. The top cover 6 is fitted on the outside of the end of the pipe 7. When the telescopic cylinder 11 pushes the support assembly 3 into the pipe 7, the tension force generated by the tension spring 5 allows the support assembly 3 to move better inside the pipe 7.

[0024] A method for using a bent pipe mandrel assembly, the method comprising the following steps: S1. Add a small amount of lubricating oil to the pipe fitting 7 to be bent, and then place the support assembly 3 into the pipe fitting 7 to be bent; S2. Place the pipe fitting 7 at the output end of the pipe bending machine and fix the telescopic cylinder 11 to the pipe bending machine; S3. Start the telescopic cylinder 11 and drive motor 12, and start the pipe bending machine; After step S2, the top cover 6 is connected to one end of the tension spring 5, and the top cover 6 is fitted onto the end of the pipe 7 to be bent.

[0025] Working principle: First, add a small amount of lubricating oil to the inside of the pipe to be bent 7. Then, insert the support assembly 3 into the inside of the pipe to be bent 7. Place the pipe to be bent 7 at the output end of the pipe bending machine and fix the telescopic cylinder 11 to the pipe bending machine. Then, use the tension spring 5 to elastically connect the top cover 6 to the support assembly 3 and put the top cover 6 on the outside of the end of the pipe to be bent 7. Start the telescopic cylinder 11 and the drive motor 12, and then start the pipe bending machine to bend the pipe 7.

[0026] While rotating at the bend within the pipe fitting, the support assembly 3 slides axially, providing dynamic support to the interior of the pipe fitting. Since the sliding and rotational speeds of the support assembly are driven by external power components, these speeds can be increased using external power components (telescopic cylinder 11 and drive motor 12). Compared to existing fixed mandrel supports, when the number of double forks 311 passing through the bend within a unit of time exceeds the number of mandrel sections, the support effect of this patent is superior to that of fixed supports, and it has significant room for improvement.

[0027] The support component 3 can adopt reciprocating sliding or unidirectional sliding. Unidirectional sliding is preferred because it does not decelerate and can even be in a state of continuous acceleration. The number of double forks 311 passing through the bending position per unit time increases, thereby improving the support effect.

[0028] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A bending mandrel assembly, characterized in that, include: Support component (3); The support component (3) is chain-shaped and consists of several double universal joints (31) connected in series. Each adjacent double universal joint (31) is fixedly connected to the other. Several balls (32) are rolled in all directions on the outside of the double fork (311) of each double universal joint (31) and distributed on the outside of the double fork (311). The ball bearings (32) are mounted in a circular array on the double fork (311) in an omnidirectional rolling manner; It also includes: a drive mechanism (1); a flexible shaft (4) is fixedly installed on the double universal joint (31) at one end of the support component (3); the output end of the drive mechanism (1) is fixedly connected to the flexible shaft (4), and the drive mechanism (1) is used to drive the flexible shaft (4) to rotate and drive the support component (3) to move; The drive mechanism (1) includes: a telescopic cylinder (11) and a controller; a drive motor (12) is fixedly installed at the output end of the telescopic cylinder (11), and the output shaft of the drive motor (12) is fixedly connected to the flexible shaft (4); the telescopic cylinder (11) and the drive motor (12) are both electrically connected to the controller; During the bending process of the pipe fitting, the support component (3) rotates at the bending position and slides along the axial direction, forming dynamic support for the inside of the pipe fitting.

2. The bending mandrel assembly according to claim 1, characterized in that, A tension spring (5) is provided on the double universal joint (31) at the other end of the support assembly (3).

3. The bending mandrel assembly according to claim 2, characterized in that, It also includes: a top cover (6); the top cover (6) is located on the outside of one end of the pipe and is elastically connected to the double universal joint (31) through the tension spring (5).

4. A method of using a bending mandrel assembly, comprising using any one of the bending mandrel assemblies according to claims 1-3, characterized in that, The method includes the following steps: S1. Place the support assembly (3) into the pipe (7) to be bent; S2. Place the pipe fitting (7) at the output end of the pipe bending machine and fix the telescopic cylinder (11) to the pipe bending machine; S3. Start the telescopic cylinder (11) and drive motor (12), and start the pipe bending machine; during the bending process of the pipe, the support component (3) rotates at the bending position and slides along the axial direction to form dynamic support for the inside of the pipe; The sliding direction of the support component (3) is either unidirectional sliding or reciprocating sliding.

Images