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Hydraulic direct-acting type steel pipe expanding head

A steel pipe diameter expansion, direct-acting technology, applied in the field of structural systems, hydraulic direct-action steel pipe expansion head, can solve the problems of high processing accuracy, lower mechanical efficiency of equipment, high use and maintenance costs, etc., to achieve easy maintenance, The effect of reducing equipment costs and maintenance costs and increasing overall efficiency

Inactive Publication Date: 2018-11-20
CHINA NAT HEAVY MACHINERY RES INSTCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing conical oblique diameter expansion structure has the following problems: firstly, the conical structure is complex, the processing precision is extremely high, the machining is difficult, and the maintenance cost is high; During the process, there is a lot of friction between the cone and the slope, which not only greatly reduces the mechanical efficiency of the equipment, but more seriously, it will cause the metal between the cone and the slope to "bite" or even "stick". ", resulting in damage to the equipment, which puts forward higher requirements for the wear resistance and hardness of the cone material

Method used

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  • Hydraulic direct-acting type steel pipe expanding head
  • Hydraulic direct-acting type steel pipe expanding head
  • Hydraulic direct-acting type steel pipe expanding head

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A hydraulic direct-acting steel pipe expansion head, which includes a diameter expansion head body 1, a hydraulic control system 5 and an electrical control system 6, the expansion head body 1 includes a diameter expansion head frame 2 and several expansion heads of the same specification. Diameter device, wherein the diameter expansion device is fixed on the outer wall of the frame 2 along the circumference of the diameter expansion head, and several diameter expansion devices are electrically connected with the hydraulic control system 5, and the hydraulic control system 5 is connected to the external power supply through the electrical control system 6. sexual connection.

[0023] The hydraulic direct-acting steel pipe expansion head is easy to implement and has strong practicability. It abandons the traditional cone and inclined plane structure and adopts several expansion devices of the same specification, which avoids the expensive processing of cones and inclined ...

Embodiment 2

[0025] Such as figure 1 , image 3 As shown, it is improved on the basis of Embodiment 1, and the diameter expanding device includes a straight-acting hydraulic cylinder 4 and an expanding die 3 fixedly connected with the direct-acting hydraulic cylinder 4 .

[0026] The cylinder part of the straight-acting hydraulic cylinder 4 is fixed on the outer wall of the expanding head frame 2 circumferentially, and one end face of the expanding die 3 is fixed to the end of the piston rod of the direct-acting hydraulic cylinder 4, and the expanding die The other end face of 3 is an arc surface.

[0027] When the several straight-acting hydraulic cylinders 4 are at the maximum stroke, the arc surface of each expanding die 3 is located on the arc of a concentric circle of the expanding head frame 2 .

[0028] The several direct-acting hydraulic cylinders 4 are electrically connected with the hydraulic control system 5 .

[0029] The expansion head body 1 includes the expansion head fra...

Embodiment 3

[0031] Such as image 3 , Figure 4 As shown, it is improved on the basis of Embodiment 1. The expander head frame 2 is a cylindrical structure, and the outer edges of the outer walls of the cylinder outer walls of the expander head frame 2 have retaining walls. The expander head frame 2 The outer wall of the cylinder between the retaining walls at both ends is fixed with a number of straight-acting hydraulic cylinders 4 at intervals in the circumferential direction, and the height of the outer edge of the retaining wall is greater than the arc surface height of the expanding die 3 in the non-working state, and smaller than the arc surface of the expanding die 3 in the working state high.

[0032] The cylinder of the expanding head frame 2 is integrally formed with the retaining walls located at the outer edges of both ends of the outer wall.

[0033] The expansion head frame 2 of the cylindrical structure has retaining walls on both ends of the outer wall of the cylinder. ...

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Abstract

The invention discloses a hydraulic direct-acting type steel pipe expanding head applied to a steel pipe finishing procedure. The hydraulic direct-acting type steel pipe expanding head comprises an expanding head rack. The expanding head rack is of an integrated structure formed by enabling the middles of two hollow circular steel plates to be fixedly connected with a hollow cylinder. The maximumhole diameter of the cylinder is smaller than the hole diameters of the steel plates. A plurality of direct-acting hydraulic cylinders are uniformly arranged on the outer wall of the cylinder radiallyalong the circumference of the cylinder. The other ends of the direct-acting hydraulic cylinders are movably connected with expanding dies through movable rods correspondingly. The expanding head rack is further electrically connected with a hydraulic system and an electric control and detecting system. According to the hydraulic direct-acting type steel pipe expanding head, a traditional cone and bevel structure is abandoned, the direct-acting hydraulic cylinders are adopted for directly producing the radial expanding force, machining of expensive cones and bevel blocks is avoided, and the equipment cost can be greatly lowered. The expanding force is directly produced by the direct-acting hydraulic cylinders, no huge friction force exists between the cones and bevels, and the overall efficiency of an expanding system can be increased exponentially.

Description

technical field [0001] The invention relates to the technical field of steel pipe manufacturing equipment, in particular to a hydraulic direct-acting steel pipe expanding head, specifically a structural system for realizing "setting" and "calibration" of steel pipe diameters according to the requirements of the diameter expanding process. Background technique [0002] Steel pipe expansion is a process of machining rough-formed steel pipes. By applying a certain radial force to the steel pipes, the steel pipes will undergo appropriate plastic deformation to achieve the diameter and roundness required by the process, and at the same time eliminate part of the internal stress of the steel pipes. . The existing steel pipe diameter expansion systems all adopt the cone-shaped slope structure to transmit the diameter-expanding force. Specifically, the axial force generated by the hydraulic cylinder is converted and amplified into a radial diameter-expanding force through the cone-s...

Claims

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Application Information

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IPC IPC(8): B21D39/08
CPCB21D39/08
Inventor 王震孔立群丁锋王果吴凡陈建峰
Owner CHINA NAT HEAVY MACHINERY RES INSTCO
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