Hydraulic pipe bending machine

Abstract

A hydraulic pipe bending machine comprises a machine frame, a hydraulic cylinder and a hydraulic cylinder piston rod, and a locking nut used for fastening a connecting base plate to a flange nut, the connecting base plate, the flange nut, a guide rail and a guide rail sliding block are sequentially installed on a connecting thread at the tail section of the hydraulic cylinder piston rod from inside to outside. The middle arc-shaped bending die, the switch pull rod, the travel switch shifting block, the return stroke switch shifting block, the travel limiting toggle switch, the return stroke limiting toggle switch, the front arc-shaped bending die, the front manual rotating clamping head, the rear arc-shaped bending die and the rear manual rotating clamping head are connected to the flange nut through fastening bolts and connected with the guide rail sliding block through threads. The device is reliable in workpiece clamping, accurate in positioning, high in forming precision, good in workpiece forming quality, high in automation degree, low in labor intensity, low in labor cost and high in production efficiency, and the bent pipe forming precision is ensured. The flat tube heat exchanger can be widely applied to tubular heat exchangers, in particular to flat tube heat exchangers in the casting industry.

Description

TECHNICAL FIELD

[0001] The present application relates to a hydraulic pipe bender, which can be widely used in tubular heat exchanger, especially in flat tube heat exchanger of casting industry. BACKGROUND

[0002] In order to improve the heat exchange effect of the heat exchanger, the existing tubular heat exchanger often needs to bend the stainless steel pipe to increase the heat exchange area. The existing pipe bending forming is operated manually. In the process of pipe bending, due to uneven manual force, whether the pipe material is bent to the appropriate angle can only be judged by observation and feeling each time, which is time-consuming and laborious. When the workpiece is bent, the position of the workpiece is easy to deviate and shift, the stability is not high, the positioning accuracy is low, the product bending is poor, the manpower and material resources are wasted, the work efficiency is reduced, and the cost is increased. SUMMARY

[0003] The present application aims to provide a hydraulic pipe bender which is reliable in workpiece clamping, accurate in positioning, ensures bending forming precision, has high forming precision and good workpiece forming quality, is high in automation degree, reduces labor intensity, is low in labor cost, and is high in production efficiency.

[0004] In order to achieve the above-mentioned purpose, the hydraulic pipe bender comprises a rack, a hydraulic cylinder installed on the rack workbench, a hydraulic cylinder piston rod provided with a connecting thread at the tail end, a locking nut for fastening the connecting pad plate to the flange nut, a connecting pad plate and a flange nut installed on the connecting thread of the tail end of the hydraulic cylinder piston rod from inside to outside in sequence, a guide rail installed on the rack workbench, a guide rail slider located in the guide rail groove and capable of sliding on the guide rail, an intermediate arc-shaped bending die connected to the flange nut through a fastening bolt and connected to the guide rail slider through a thread, a switch pull rod installed on the connecting pad plate, a stroke switch knob and a return stroke switch knob installed on the switch pull rod, a stroke limit knob installed on the rack workbench close to the stroke switch knob, a return stroke limit knob installed on the rack workbench close to the return stroke switch knob, a front arc-shaped bending die installed on the rack workbench, a front manual rotary clamping head installed on the rack workbench through a front hinge shaft close to the front arc-shaped bending die and used for clamping the front end of the stainless steel pipe workpiece, a rear arc-shaped bending die installed on the rack workbench and symmetrically arranged with the front arc-shaped bending die, and a rear manual rotary clamping head installed on the rack workbench through a rear hinge shaft close to the rear arc-shaped bending die and used for clamping the rear end of the stainless steel pipe workpiece.

[0005] The front manual rotary clamping head of the hydraulic pipe bender has a cylindrical head.

[0006] The rear manual rotary clamping head of the hydraulic pipe bender has a cylindrical head.

[0007] The connecting pad plate of the hydraulic pipe bending machine plays the role of connecting the switch pull rod and the role of fastening the gasket.

[0008] The working principle of the hydraulic pipe bending machine is as follows: firstly, the stainless steel straight pipe workpiece is placed on the front arc bending die and the rear arc bending die, and the stainless steel pipe workpiece is clamped and positioned on the front arc bending die and the rear arc bending die by manually rotating the front manual rotating clamping head and the rear manual rotating clamping head; then, the hydraulic cylinder drives the hydraulic cylinder piston rod to move forward, drives the intermediate arc bending die connected thereto to move on the guide rail through the guide rail sliding block, when the intermediate arc bending die approaches the stainless steel straight pipe, the stainless steel straight pipe starts to deform and bends along the curvature of the intermediate arc bending die, and the other two sides also deform along the front arc bending die and the rear arc bending die, so that the stainless steel straight pipe is bent into a required curvature size, the hydraulic cylinder pressure is maintained for a certain time to prevent rebound; when moving to the stroke limit position, the stroke limit switch is triggered by the stroke switch block, a stroke termination signal is sent, pipe bending forming is completed, the piston rod in the hydraulic cylinder is retracted to unload pressure, and the back stroke starts; when the back stroke limit switch is triggered by the back stroke switch block, a back stroke termination signal is sent, the intermediate arc bending die returns to the initial position, at this time, the front manual rotating clamping head and the rear manual rotating clamping head are manually rotated in the reverse direction to loosen, and the bent pipe workpiece is unloaded, so that a working cycle is completed.

[0009] The hydraulic pipe bending machine can clamp and fix the two ends of the stainless steel straight pipe blank through the front manual rotating clamping head and the rear manual rotating clamping head clamping mechanism, so that the steel pipe workpiece is fixed on the front arc bending die and the rear arc bending die, the phenomenon of deviation in the bending process is avoided, the stainless steel pipe is prevented from slipping in the working process, and therefore, the workpiece clamping is reliable.

[0010] In the pipe bending process, the intermediate arc bending die slides on the guide rail through the guide rail sliding block, so that the intermediate arc bending die does not produce deflection in the movement process, and therefore, the positioning is accurate and the pipe bending forming precision is ensured.

[0011] In the pipe bending process, the hydraulic pipe bending machine adopts a hydraulic forming and stroke switch control mode, and force is applied through the hydraulic cylinder, when the intermediate arc bending die approaches the stainless steel straight pipe, the stainless steel straight pipe starts to deform and bend along the curvature of the intermediate arc bending die, the intermediate arc bending die is pressed and formed, and the other two sides also deform along the front arc bending die and the rear arc bending die, so that the stainless steel straight pipe is bent into a required curvature size, the hydraulic cylinder pressure is maintained for a certain time to prevent rebound, and therefore, the forming precision is high and the workpiece forming quality is good.

[0012] The hydraulic pipe bending machine has the advantages that workpiece installation and dismounting are simple and convenient, workpiece can be quickly dismounted, time required is short, degree of automation is high, labor intensity is reduced, labor cost is low, and production efficiency is high.

[0013] In summary, the hydraulic pipe bending machine has the advantages that workpiece clamping is reliable, positioning is accurate, pipe bending forming precision is ensured, forming precision is high, workpiece forming quality is good, degree of automation is high, labor intensity is reduced, labor cost is low, and production efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0014] The application will be further described below in combination with the drawings and embodiments thereof.

[0015] Figure 1 is a structural schematic diagram of the application;

[0016] Figure 2 is a top view in Figure 1 ;

[0017] Figure 3 is a structural schematic diagram of the pipe forming workpiece of the application. DETAILED DESCRIPTION

[0018] In Figures 1-3 , the hydraulic pipe bending machine comprises a rack 1, a hydraulic cylinder 2 installed on the rack workbench, a hydraulic cylinder piston rod 3 provided with a connecting thread at the tail end, a locking nut 4 for fastening the connecting pad plate to the flange nut, a connecting pad plate 5, and a flange nut 6 installed on the connecting thread at the tail end of the hydraulic cylinder piston rod from inside to outside, a guide rail 7 installed on the rack workbench, a guide rail sliding block 8 located in the guide rail groove and capable of sliding on the guide rail, an intermediate arc-shaped bending die 10 connected to the flange nut through a fastening bolt 9 and connected to the guide rail sliding block through a thread, a switch pull rod 11 installed on the connecting pad plate, a stroke switch knob 12 and a return stroke switch knob 13 installed on the switch pull rod, a stroke limit knob 14 installed on the rack workbench close to the stroke switch knob, a return stroke limit knob 15 installed on the rack workbench close to the return stroke switch knob, a front arc-shaped bending die 16 installed on the rack workbench, a front manual rotary clamping head 18 installed on the rack workbench through a front hinge shaft 17 close to the front arc-shaped bending die for clamping the front end of the stainless steel pipe workpiece 22, a rear arc-shaped bending die 19 installed on the rack workbench in a symmetrical manner with the front arc-shaped bending die, and a rear manual rotary clamping head 21 installed on the rack workbench through a rear hinge shaft 20 close to the rear arc-shaped bending die for clamping the rear end of the stainless steel pipe workpiece.

[0019] The front manual rotary clamping head of the hydraulic pipe bending machine has a cylindrical head.

[0020] The hydraulic pipe bender, the rear manual rotary clamping head has a cylindrical head.

[0021] The hydraulic pipe bender, the connecting pad plate plays a role of connecting the switch pull rod and fastening the gasket.

[0022] To sum up, the above describes the preferred embodiments of the present application, it should be pointed out that the present application is not limited to the specific embodiments described above, wherein the equipment and structure not described in detail should be understood as being implemented in the ordinary way in the art; any person skilled in the art, without departing from the scope of the technical solutions of the present application, according to the technical essence of the present application, any simple modification, equivalent change and modification of the above embodiments, still belongs to the protection scope of the technical solutions of the present application.

Claims

1. A hydraulic tube bender characterized by comprising: The hydraulic cylinder is installed on the workbench of the frame, the piston rod of the hydraulic cylinder is provided with a connecting thread at the end, a locking nut for fastening the connecting pad plate to the flange nut is installed on the connecting thread of the piston rod of the hydraulic cylinder from inside to outside, the connecting pad plate and the flange nut are installed on the locking nut, the guide rail is installed on the workbench of the frame, the guide rail slider is located in the guide rail groove and can slide on the guide rail, the intermediate arc bending die is connected to the flange nut through the fastening bolt and is connected to the guide rail slider through the thread, the switch pull rod is installed on the connecting pad plate, the stroke switch and the return switch are installed on the switch pull rod, the stroke limit switch is installed on the workbench of the frame and is close to the stroke switch, the return limit switch is installed on the workbench of the frame and is close to the return switch, the front arc bending die is installed on the workbench of the frame, the front manual rotary clamping head is installed on the workbench of the frame through the front hinge shaft and is used for clamping the front end of the stainless steel pipe workpiece, the rear arc bending die is installed on the workbench of the frame and is symmetrically arranged with the front arc bending die, the rear manual rotary clamping head is installed on the workbench of the frame through the rear hinge shaft and is used for clamping the rear end of the stainless steel pipe workpiece.

2. The hydraulic tube bender of claim 1, wherein, The head of the front manual rotary clamping head is cylindrical.

3. The hydraulic tube bender of claim 1, wherein, The head of the rear manual rotary clamping head is cylindrical.

4. The hydraulic tube bender of claim 1, wherein, The connecting pad plate plays the role of connecting the switch pull rod and the role of fastening the gasket.

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