Bending power assisting device of pipe bending machine

Abstract

A bending power assisting device of a pipe bending machine comprises a power assisting arm, a spring and a telescopic sleeve, one end of the power assisting arm is arranged outside a bending shaft of the pipe bending machine in a penetrating and sleeving mode and fixed to a driven chain wheel, a first hinge shaft is installed at the other end of the power assisting arm, and the first hinge shaft is hinged to one end of an upper sleeve; the telescopic sleeve comprises an upper sleeve and a lower sleeve which are concentric, the other end of the upper sleeve is located in one end of the lower sleeve, the other end of the lower sleeve is fixed to a machine body of the pipe bending machine, the spring is arranged in the upper sleeve and the lower sleeve, the upper end of the spring makes contact with the inner end face of the upper sleeve, and the lower end of the spring makes contact with the inner end face of the lower sleeve. And in the pipe bending process, the direction of the torque generated by the spring to the driven chain wheel is always opposite to the direction of the torque generated by the gravity of the pipe bending machine guide frame to the driven chain wheel.

Description

Technical Field

[0001] This utility model relates to a component of a pipe bending machine, and more particularly to a bending assist device for a pipe bending machine. Background Technology

[0002] The pipe bending machine mainly completes the bending and forming of metal pipes through the bending component. The main structure of the bending component and the connection methods and relative motion relationships between its various parts are as follows: The servo motor is mounted on the machine body, and the driven sprocket is connected to the bending rotary shaft through a spline. The servo motor drives the bending rotary shaft to rotate through chain drive. Because components such as the mold, material guiding mechanism, and unloading mechanism are all mechanically connected to the bending shaft, they rotate synchronously with the bending rotary shaft during the pipe bending process. Furthermore, the center of gravity of the assembly of components such as the mold, material guiding mechanism, and unloading mechanism is not on the axis of the bending rotary shaft. Therefore, in the early stage of the pipe bending process, the gravity of the mold, material guiding mechanism, and unloading mechanism will hinder the rotation of the bending rotary shaft. In the later stage, due to the large inertia, it will have a negative impact on the transmission system and servo motor. Interference with equipment stability, especially in ultra-long U-tube bending machines, is a significant issue. The material guiding mechanism is larger and heavier, and the distance from its center of gravity to the bending shaft is greater. Therefore, the gravity of these components exerts a greater resistance to the bending shaft, necessitating the use of a higher-power servo motor, which requires more space. Using a lower-power motor necessitates a higher transmission ratio, impacting production capacity and potentially triggering overload protection, causing the motor to alarm and shut down, thus affecting efficiency. This also increases manufacturing difficulty, production costs, and energy consumption. Furthermore, the increased load places greater stress and impact on the drive sprocket, driven sprocket, and chain. The long operating time and high frequency of the chain and sprockets inevitably shorten their lifespan, increasing the equipment failure rate. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to overcome the above-mentioned defects of the prior art and provide a bending assist device for a pipe bending machine, which can reduce the load of the pipe bending machine when bending pipes and reduce the motor power requirement.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0005] A bending assist device for a pipe bending machine includes an assist arm, a spring, and a telescopic sleeve. One end of the assist arm is sleeved around the bending shaft of the pipe bending machine and fixed to a driven sprocket. The other end is fitted with a first hinge shaft, which is hinged to one end of an upper sleeve. The telescopic sleeve includes an upper sleeve and a lower sleeve, which are concentric. The other end of the upper sleeve is located inside one end of the lower sleeve, and the other end of the lower sleeve is fixed to the machine body of the pipe bending machine. The spring is placed inside the upper and lower sleeves, with its upper end contacting the inner end face of the upper sleeve and its lower end contacting the inner end face of the lower sleeve. During the bending process, the direction of the torque generated by the spring on the driven sprocket is always opposite to the direction of the torque exerted by the gravity of the pipe bending machine's guide frame on the driven sprocket.

[0006] Even better, a column is integrated into the lower sleeve, with the spring sleeved outside the column, which can better guide the spring compression.

[0007] Even better, the column is a hollow column, and the lower sleeve connected to the hollow column has a threaded hole at its end. The machine body is equipped with a bolt, one end of which is screwed into the threaded hole and located inside the hollow column, while the other end is hinged to the machine body via a second hinge shaft mounted on the machine body. In this way, the amount of spring deformation inside the telescopic sleeve can be easily adjusted by rotating the lower sleeve.

[0008] Compared with the prior art, the advantages of this utility model are as follows: by setting up an assist device during the bending of the pipe bending machine, the load of the pipe bending machine during bending is reduced, thereby reducing the energy consumption of the pipe bending machine and reducing its size; at the same time, it also extends the service life of the chain and driven sprocket and reduces the failure rate. Therefore, it has significant effects in reducing production and manufacturing costs, improving the overall performance of the equipment, and saving energy and protecting the environment. Attached Figure Description

[0009] Figure 1 This is a front structural diagram of a bending assist device for a pipe bending machine according to an embodiment of the present invention.

[0010] Figure 2 This is a top view of a bending assist device for a pipe bending machine according to an embodiment of the present invention.

[0011] Figure 3 This is a partial cross-sectional view of a bending assist device for a pipe bending machine according to an embodiment of the present invention. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] like Figure 1 , Figure 2 and Figure 3 As shown, a bending assist device for a pipe bending machine includes: an assist arm 1, a spring 2, a telescopic sleeve 3, and a bolt 4.

[0014] The bending assist device consists of two sets, symmetrically arranged on both sides of the pipe bending machine with the pipe bending machine as the center.

[0015] One end of the assisting arm 1 is sleeved on the bending shaft 5 of the pipe bending machine and fixed together with the driven sprocket 6. The other end is equipped with a first hinge shaft 101, which is hinged to one end of the upper sleeve 301. Thus, the other end of the assisting arm 1 drives the upper sleeve 301 to move through the first hinge shaft 101.

[0016] The telescopic sleeve 3 includes an upper sleeve 301 and a lower sleeve 302, which are concentric. One end of the upper sleeve 301 is located inside the lower sleeve 302. One end of the lower sleeve 302 is provided with a threaded hole 3021 and a hollow column 3022 integral with the lower sleeve 302. One end of the bolt 4 is screwed into the threaded hole 3021 and located inside the hollow column 3022, while the other end is hinged to the machine body 7 via a second hinge shaft 701 mounted on the machine body 7. Figure 3 .

[0017] The spring 2 is located inside the telescopic cylinder 3 and sleeved outside the hollow column 3022. Its upper end is in contact with the inner end face 3011 of the upper sleeve 301, and its lower end is in contact with the inner end face 3023 of the lower sleeve 302.

[0018] Since the lower sleeve 302 is threadedly connected to the bolt 4, the lower sleeve 302 can be rotated to adjust its initial position as needed, thereby adjusting the spring deformation.

[0019] Since a hollow column 3022 is provided inside the lower sleeve 302, and the spring 2 is sleeved on the outside of the hollow column 3022, the hollow column 3022 can guide the linear extension and contraction of the spring 2.

[0020] During the operation of the pipe bending machine, when the pipe is fed, the guide frame 8 is in a horizontal position. During the bending of the U-shaped pipe, the guide frame 8 rotates 180° clockwise. As the guide frame 8 rotates from its initial position to 90°, the torque generated by the spring force of spring 2 on the driven sprocket 6 is clockwise, while the torque generated by the gravity of the guide frame 8 and other components on the driven sprocket is counterclockwise. The spring deformation gradually decreases, the effect of the spring force on the driven sprocket decreases, and the torque generated by the gravity of the guide frame and other components on the driven sprocket gradually decreases. When the guide frame rotates from 90° to 180°, the torque generated by the spring force on the driven sprocket is counterclockwise, while the torque generated by the gravity of the guide frame and other components on the driven sprocket is clockwise. The spring deformation gradually increases, the torque generated by the spring force on the driven sprocket increases, and the torque generated by the gravity of the guide frame and other components on the driven sprocket gradually increases. During the bending process, the torque generated by the spring force on the driven sprocket 6 is always opposite to the torque of gravity on the driven sprocket. Therefore, the influence of gravity such as the guide frame is reduced, which plays a role in assisting and buffering. As a result, the motor power does not need to be too large, thereby reducing manufacturing costs and improving the overall performance of the equipment.

Claims

1. A bending assist device for a pipe bending machine, characterized in that: The device includes an assist arm, a spring, and a telescopic sleeve. One end of the assist arm is sleeved around the bending shaft of the pipe bending machine and fixed to the driven sprocket. The other end is fitted with a first hinge shaft, which is hinged to one end of the upper sleeve. The telescopic sleeve includes an upper sleeve and a lower sleeve, which are concentric. The other end of the upper sleeve is located inside one end of the lower sleeve, and the other end of the lower sleeve is fixed to the machine body of the pipe bending machine. The spring is placed inside the upper and lower sleeves, with its upper end in contact with the inner end face of the upper sleeve and its lower end in contact with the inner end face of the lower sleeve. During the pipe bending process, the direction of the torque generated by the spring on the driven sprocket is always opposite to the direction of the torque exerted by the gravity of the pipe bending machine guide frame on the driven sprocket.

2. The bending assist device of the pipe bending machine as described in claim 1, characterized in that: The lower sleeve is fitted with a column that is integral with it, and the spring is sleeved on the outside of the column.

3. The bending assist device of the pipe bending machine as described in claim 2, characterized in that: The column is a hollow column, and the lower sleeve connected to the hollow column has a threaded hole at its end. The machine body is equipped with bolts, one end of which is screwed into the threaded hole and located inside the hollow column, and the other end is hinged to the machine body through a second hinge shaft installed on the machine body.

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