Special cylinder for forming super pipe nozzles

Abstract

The present invention relates to a special oil cylinder for forming a super pipe nozzle, wherein the upper part of the cylinder has an upper concave plane, arc supports are formed at both ends of the upper concave plane, and a hole for the piston rod to enter and exit is provided in the middle of the upper concave plane; the piston rod head has an inverted T-shaped groove, and the inverted T-shaped groove matches the convex block at the bottom end of the hot extrusion punch; there are rectangular water tanks on the concave surfaces on both sides of the cylinder, and the rectangular water tanks on both sides are connected through three cooling water pipelines that run through the oil cylinder; spring balls are evenly distributed on the circular arc at the bottom of the oil cylinder, and the bottom entrance end of the oil cylinder is chamfered. The present invention is an oil cylinder integrally forged from PCrNi3MoVQ material, which can ensure high strength of the cylinder body. There are spring balls on the bottom circular arc, and the entrance end of the oil cylinder is chamfered, which is convenient for entering and exiting the super pipe; there is a waterway, and it is sealed to ensure that the temperature of the oil cylinder can be maintained at 45°-55° when it is working normally. The present invention can meet the conditions for completing the top extension in the super pipe; while ensuring a pressure of 650T, the outer dimensions are small.

Description

Technical Field

[0001] The invention relates to a special oil cylinder for forming a super pipe nozzle. Background Art

[0002] The outer diameter of the CAP1400 super pipe mother pipe reaches 1067mm. The existing hydraulic press and tooling are limited by space and cannot extrude super pipes of this size. A set of extrusion tooling needs to be designed. In this tooling, the ultra-high pressure cylinder is an important component and needs to work inside the super pipe.

[0003] The oil cylinder needs to be placed in the super pipe when working, and the maximum extension force during working is not less than 650T, so there are corresponding requirements for the outer dimensions and pressure resistance of the oil cylinder. According to calculations, the working pressure of the oil cylinder needs to reach 63MPa, while the maximum pressure of the standard ultra-high pressure oil cylinder is 40MPa. Because the oil cylinder needs to be placed under the prefabricated hole of the super pipe when working, when the prefabricated hole of the super pipe is heated at high temperature, the high temperature radiation heat during heating will be transferred to the oil cylinder, causing the oil temperature in the oil cylinder to rise, and the oil temperature needs to be maintained between 45℃-55℃ during working. Therefore, the shape, pressure, wall thickness and working environment requirements of the standard ultra-high pressure oil cylinder cannot meet the working conditions.

[0004] Therefore, it is necessary to design a special oil cylinder for forming the nozzle of the super pipe, which can work in the super pipe and ensure the high strength of the cylinder body, high temperature radiation resistance and high pressure resistance. Summary of the invention

[0005] The purpose of the present invention is to overcome the above problems and design a special oil cylinder for forming a super pipe nozzle with a scientific and reasonable structure, which can work in a super pipe and is resistant to high temperature radiation and high pressure.

[0006] The purpose of the present invention is achieved in that a special oil cylinder for forming a super pipe nozzle is a PCrNi3MoVQ material oil cylinder; an upper concave plane is provided on the upper part of the cylinder, arc supports are formed at both ends of the upper concave plane, and a hole for the piston rod to enter and exit is provided in the middle of the upper concave plane; the piston rod head has an inverted T-shaped groove, and the inverted T-shaped groove matches the convex block at the bottom end of the hot extrusion punch; rectangular water grooves are provided on the concave surfaces on both sides of the cylinder, and the rectangular water grooves on both sides are connected through three cooling water pipelines that run through the oil cylinder; spring balls are evenly distributed on the arc at the bottom of the oil cylinder, and the oil cylinder entry end is chamfered at 15-45 degrees;

[0007] The cylindrical height is 5-15mm smaller than the inner diameter of the super pipe, the length is 800-1200mm, and the distance between the concave surfaces on both sides is 200-300mm smaller than the diameter of the super pipe.

[0008] When the present invention is used, it is first sent into the super pipe, to the working position under the prefabricated hole of the nozzle, the oil cylinder water cooling cycle is turned on, and then the area around the prefabricated hole of the super pipe nozzle is locally heated. After sufficient heat preservation, the present invention works to push the piston rod to move forward with the punch at a uniform speed to extrude the super pipe nozzle into shape.

[0009] The invention has a compact structure and can be placed inside a super pipe to perform nozzle extrusion molding. While ensuring a pressure of 650T, the outer dimensions are much smaller than those of an ordinary piston cylinder. The invention has a water cooling pipeline inside, which can ensure long-term operation in a high-temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The structural diagram of the present invention is as follows:

[0011] Figure 2 This is a schematic diagram of the bottom structure of the present invention.

[0012] Figure 3 This is a schematic diagram of water cooling of the present invention,

[0013] Figure 4 This is the state diagram of the present invention in the super pipe.

[0014] Figure 5 This is a diagram of the connection status between the piston rod and the pre-punch. DETAILED DESCRIPTION

[0015] The present invention is made of PCrNi3MoVQ material with excellent performance and is integrally forged to ensure high strength. Ordinary oil cylinders are generally made of 42CrMo material.

[0016] The present invention will be described in detail below with reference to the accompanying drawings.

[0017] The cylindrical upper part of the present invention has an upper concave plane 1, and arc supports 2 are formed at both ends of the upper concave plane. The arc support is 100-150 mm long, and the upper concave plane is 200-300 mm deep. When the piston rod returns, when the cylinder is pulled upward by the punch, the two upper arc supports will contact the upper wall of the super pipe to prevent the cylinder from being displaced upward and damaged.

[0018] Reference Figure 3 The present invention provides a rectangular water tank 3 on the concave surfaces on both sides of the cylinder. The length of the rectangular water tank is 100mm shorter than the total length of the oil cylinder, the width is 100mm lower than the upper concave plane, and the depth is 25mm. The rectangular water tank stores water for cooling the oil cylinder. The rectangular water tank is connected through the cooling water pipeline 5 that runs through the oil cylinder, so that the cooling water circulates in the entire oil cylinder. The waterway formed by the rectangular water tank 3 and the three cooling water pipes is sealed with a rubber sealing ring, and then covered and tightened with a steel plate to ensure that the temperature of the oil cylinder can be maintained at 45°-55° when it is working normally.

[0019] Reference Figure 1 , 3 The present invention has spring balls 4 evenly distributed on the bottom arc of the oil cylinder to reduce friction when the oil cylinder enters and exits the super pipe. When the oil cylinder is extended, the oil cylinder is subjected to a reaction force, the balls retract, and the large arc surface at the bottom contacts the pipe wall.

[0020] Reference Figure 4 The oil cylinder entrance end of the present invention is chamfered at 15-45 degrees, and the chamfer length is 40-80 mm, so as to facilitate entry into the super pipe.

[0021] In order to ensure that the present invention can smoothly penetrate the super pipe, the cylindrical height is 5-15mm smaller than the inner diameter of the super pipe 8, the length is 800-1200mm, and the distance between the concave surfaces on both sides is 200-300mm smaller than the diameter of the super pipe 8.

[0022] Reference Figure 2 , there is a hole 6 in the middle of the upper concave plane for the piston rod 7 to enter and exit. Figure 5 The rod head of the piston rod 7 has an inverted T-shaped groove 11, which matches the bottom end projection 10 of the hot extrusion punch 9.

[0023] Reference Figure 4 , 5 The piston rod 7 is connected to the punch 9 used for hot extrusion by screwing. When installing the punch, after the convex block 10 is inserted into the inverted trapezoidal groove 11, the punch is rotated 90 degrees as a whole, and the convex block is inserted into the inverted trapezoidal groove, so that the punch and the piston rod are firmly connected together.

[0024] According to the present invention, the punch 9 is first installed on the cylinder piston rod 7, and then the cylinder is sent into the super pipe 8, so that the center of the punch is aligned with the center of the prefabricated hole of the super pipe, the water cooling cycle of the cylinder is turned on, and then the area around the prefabricated hole of the super pipe is locally heated. After sufficient heat preservation, the cylinder works to push the piston rod 7 and the punch 9 forward at a uniform speed, so that the prefabricated hole of the super pipe 8 is hot extruded into a nozzle.

[0025] The oil cylinder of the present invention has a compact structure and can be placed inside a super pipe for hot extrusion of a nozzle. While ensuring a pressure of 650T, the outer dimensions are much smaller than those of an ordinary piston cylinder. A water cooling pipeline is provided inside the oil cylinder, which can ensure long-term operation in a high-temperature environment. Using the oil cylinder of the present invention for hot extrusion of a nozzle in a super pipe can shorten the extrusion time and improve the extrusion efficiency.

Claims

1. A special oil cylinder for forming super pipe nozzles, characterized by: The oil cylinder is made of PCrNi3MoVQ; there is an upper concave plane on the upper part of the cylinder, arc supports are formed at both ends of the upper concave plane, and a hole for the piston rod to enter and exit is provided in the middle of the upper concave plane; the piston rod head has an inverted T-shaped groove, and the inverted T-shaped groove of the piston rod head matches the convex block at the bottom end of the hot extrusion punch; there are rectangular water grooves on the concave surfaces on both sides of the cylinder, and the rectangular water grooves on both sides are connected through three cooling water pipelines that run through the oil cylinder; spring balls are evenly distributed on the arc at the bottom of the oil cylinder, and the oil cylinder entry end is chamfered at 15-45°; The cylindrical height is 5-15mm smaller than the inner diameter of the super pipe, and the length is 800-1200mm. The distance between the concave surfaces on both sides is 200-300mm smaller than the diameter of the super pipe; the arc support is 100-150mm long, and the upper concave plane is 200-300mm deep. The chamfer length of the bottom of the oil cylinder is 40-80mm; The length of the rectangular water tank is 100mm shorter than the total length of the oil cylinder, the width is 100mm lower than the upper concave plane, and the depth is 25mm.

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