Ejector rod structure of seamless steel pipe perforating machine and perforating machine

Abstract

The utility model belongs to the technical field of hot-rolled seamless steel pipes, and particularly relates to a seamless steel pipe puncher ejector rod structure and a puncher, which comprise an ejector rod, a cooling water pipe is arranged in the hollow ejector rod in a penetrating manner, an ejector head is arranged at one end of the ejector rod, and a cooling inner cavity is formed in the ejector head. The end of the cooling water pipe is led into the cooling inner cavity, a backflow channel is arranged between the ejector rod and the cooling water pipe, one end of the backflow channel is communicated with the cooling inner cavity, and the other end of the backflow channel is led out of the side, away from the ejector head, of the ejector rod. In this way, cooling water flows into the inner cavity of the ejector head firstly, the ejector head with the highest temperature is cooled firstly, then the cooling water flows back into the backflow channel to lower the temperature of the ejector rod, the injected cooling water can improve the water pressure to enhance the cooling effect under the condition that smoothness of the backflow channel is guaranteed, and deformation caused by local high temperature of the ejector rod is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of hot-rolled seamless steel pipes, and in particular relates to a top rod structure of a seamless steel pipe puncher and a puncher. Background Art

[0002] A steel pipe made of a whole piece of metal with no seams on the surface is called a seamless steel pipe. According to the production method, seamless pipes are divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes and jacking pipes, etc. According to the cross-sectional shape, seamless steel pipes are divided into round and special-shaped. The top of many seamless steel pipe piercing machines does not have a cooling structure, which makes the top easily deformed and damaged by high temperature when people use it, thus affecting the use of workers.

[0003] Patent CN214767797U discloses a punch die for the production of corrosion-resistant seamless steel pipes. The axial direction of the plug is provided with a step hole, and the end face of the plug is provided with three insertion grooves, which are arranged along the axial direction of the plug. A circular limit groove is provided on the inner wall surface of the step hole; a connecting part adapted to the step hole is provided at one end of the ejector rod, and three limit claws are provided on the outer wall of the connecting part. An external threaded surface is provided on one side of the connecting part. A heat dissipation channel is provided in the axial direction of the ejector rod, and the locking nut is tightened to make the plug contact the limit claw. The utility model can cool the plug by introducing coolant into the heat dissipation channel, thereby achieving the purpose of cooling and preventing the plug from being deformed and damaged due to high temperature. The locking and fixing between the plug and the ejector rod in the utility model is achieved by assembling the slot hole, which avoids the direct spiral locking connection between the plug and the ejector rod.

[0004] In the above scheme, a method is proposed to open a heat dissipation channel inside the ejector pin and pass coolant to cool the ejector head, thereby avoiding the problem of the ejector head being deformed and damaged due to high temperature. However, the heat dissipation channel is not a passage and cannot form a flowing water path. Its cooling efficiency is not high, especially for large-diameter ejector pins, and sufficient heat dissipation of the rod body cannot be guaranteed. Utility Model Content

[0005] The purpose of the utility model is to provide a seamless steel pipe punching machine top rod structure and a punching machine that can solve the above technical problems.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The top rod structure of a seamless steel pipe punching machine includes a top rod, a cooling water pipe is passed through the hollow inside of the top rod, a plug is provided at one end of the top rod, a cooling inner cavity is opened in the plug, the end of the cooling water pipe passes into the cooling inner cavity, a reflux passage is provided between the top rod and the cooling water pipe, one end of the reflux passage is connected to the cooling inner cavity, and the other end of the reflux passage passes out from the side of the top rod away from the plug.

[0008] In the seamless steel pipe punching machine mandrel structure, the mandrel includes a tail rod and a connecting rod, one end of the connecting rod is axially connected to the tail rod, and the other end of the connecting rod is connected to the mandrel.

[0009] In the seamless steel pipe perforator top rod structure, an annular reflux chamber is provided on the inner wall of the connecting rod, the reflux passage passes through the reflux chamber, and a reinforced lining is provided on the inner wall of the reflux chamber.

[0010] In the seamless steel pipe perforator mandrel structure, a connecting flange is provided at one end of the tail rod away from the connecting rod, the connecting flange is provided on the mandrel mounting seat, and the cooling water pipe extends from the connecting flange into the inner cavity of the mandrel mounting seat.

[0011] In the seamless steel pipe perforator mandrel structure, the reflux passage is connected to the inner cavity of the mandrel mounting seat, a water return port is provided on the connecting flange, and the inner cavity of the mandrel mounting seat communicates with the outside through the water return port.

[0012] In the seamless steel pipe perforator mandrel structure, the cooling water pipe includes a thick pipe and a thin pipe connected to each other, the thin pipe is arranged in the tail rod and the connecting rod, and the thick rod is located in the inner cavity of the mandrel mounting seat.

[0013] In the seamless steel pipe perforator mandrel structure, a water pipe adapting groove is provided at one end of the mandrel connected to the mandrel, and the end of the cooling water pipe extends into the water pipe adapting groove and leaves a gap with the inner wall of the water pipe adapting groove.

[0014] In the seamless steel pipe perforator top rod structure, a water separation filter plate is arranged in the water pipe adapter groove, and the water separation filter plate is directly opposite to the water outlet of the cooling water pipe.

[0015] In the seamless steel pipe piercing machine top rod structure, a hemispherical inner wall is provided in the cooling inner cavity near the top end of the top head, and a water outlet hole leading to the outside is provided on the hemispherical inner wall.

[0016] The utility model also provides a seamless steel pipe puncher, and the seamless steel pipe puncher includes the seamless steel pipe puncher top rod structure.

[0017] The advantages of the utility model are:

[0018] A cooling water pipe is arranged inside the ejector pin to cool the ejector head in the most timely manner, and the water flows from the reflux passage between the ejector pin and the cooling water pipe, and returns to the other end of the ejector pin for discharge, thereby forming a flow of cooling water that first flows into the inner cavity of the ejector head to cool down the ejector head with the highest temperature, and then flows back to the reflux passage to cool down the ejector pin. The cooling water injected while ensuring the reflux passage is unobstructed can increase the water pressure to enhance the cooling effect, thereby avoiding deformation of the ejector pin caused by local high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0020] Figure 2 It is a schematic diagram of the top rod structure of the utility model.

[0021] Figure 3 It is a schematic diagram of the plug structure of the utility model.

[0022] In the figure, there are push rod 1, reflux passage 11, tail rod 12, connecting rod 13, reflux chamber 14, reinforced lining 15, connecting flange 16, cooling water pipe 2, push head 3, cooling inner cavity 31, water pipe adapter groove 32, water distribution filter plate 33, water outlet hole 34, and push rod mounting seat 4. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the utility model and the accompanying drawings to further describe the technical solution of the utility model, but the utility model is not limited to these embodiments.

[0024] Example 1

[0025] like Figure 1-Figure 3 As shown, the top rod structure of the seamless steel pipe punching machine includes a top rod 1, a cooling water pipe 2 is passed through the hollow top rod 1, a plug 3 is provided at one end of the top rod 1, a cooling inner cavity 31 is opened in the plug 3, the end of the cooling water pipe 2 is passed into the cooling inner cavity 31, a reflux passage 11 is provided between the top rod 1 and the cooling water pipe 2, one end of the reflux passage 11 is connected to the cooling inner cavity 31, and the other end of the reflux passage 11 passes from the side of the top rod 1 away from the plug 3.

[0026] That is, a cooling water pipe 2 is arranged inside the ejector pin 1 to cool the ejector head 3 in the most timely manner, and water flows from the reflux passage 11 between the ejector pin 1 and the cooling water pipe 2, and returns to the other end of the ejector pin 1 for discharge, thereby forming a flow of cooling water that first flows into the inner cavity of the ejector head 3 to cool down the ejector head 3 with the highest temperature, and then flows back to the reflux passage 11 to lower the temperature of the ejector pin 1. The cooling water injected while ensuring that the reflux passage 11 is unobstructed can increase the water pressure to enhance the cooling effect.

[0027] In this embodiment, the mandrel 1 includes a tail rod 12 and a connecting rod 13 , one end of the connecting rod 13 is axially connected to the tail rod 12 , and the other end of the connecting rod 13 is connected to the mandrel 3 .

[0028] In order to ensure the connection strength between the tail rod 12 and the connecting rod 13, the two are connected by welding, and a circumferential weld groove is provided at the connection between the two. And the top rod 1 can be lengthened by welding more connecting rods 13 according to the size of the steel billet.

[0029] In this embodiment, an annular reflux chamber 14 is provided on the inner wall of the connecting rod 13, and the reflux passage 11 passes through the reflux chamber 14. The reflux water needs to pass through the reflux passage 11 of the length of the top rod 1 before it can flow out from the other end. Under high water pressure, air will be mixed into the reflux passage 11 and affect the flow rate of the reflux cooling water. Therefore, the reflux chamber 14 is provided in the middle of the reflux passage 11 so that the gas can be temporarily discharged into the reflux chamber 14 to allow more cooling water to pass quickly.

[0030] A reinforcing lining 15 is provided on the inner wall of the reflux chamber 14. During the hole opening process, the push rod 1 is subjected to a large axial pressure, especially around the weld where there are weak stress strength areas. Usually, a reflux chamber 14 is also opened in these areas, and a reinforcing lining 15 is added to the inner wall of the reflux chamber 14 to improve the overall strength of the push rod 1.

[0031] In this embodiment, a connecting flange 16 is provided at one end of the tail rod 12 away from the connecting rod 13 . The connecting flange 16 is arranged on the mandrel mounting seat 4 . The cooling water pipe 2 extends from the connecting flange 16 into the inner cavity of the mandrel mounting seat 4 .

[0032] Preferably, the reflux passage 11 is connected to the inner cavity of the mandrel mounting seat 4, a water return port is provided on the connecting flange 16, and the inner cavity of the mandrel mounting seat 4 is communicated with the outside through the water return port.

[0033] The mandrel mounting seat 4 is provided with a groove for the connecting flange 16 to be embedded, and the coolant flowing out of the return path 11 will enter the cavity inside the mandrel mounting seat 4, and then be discharged out of the device from the return water port provided on the connecting flange 16. The cavity inside the mandrel mounting seat 4 has enough space to accommodate the cooling water, so that the water pump can apply a larger pressure to increase the flow rate of the cooling water.

[0034] Preferably, the cooling water pipe 2 includes a thick pipe and a thin pipe connected to each other, the thin pipe is arranged in the tail rod 12 and the connecting rod 13, and the thick pipe is located in the inner cavity of the top rod mounting seat 4.

[0035] The water pump first pumps the cooling water into a thick pipe, and then turns it into a thin pipe before entering the push rod 1 to increase the water pressure of the cooling water.

[0036] In this embodiment, a water pipe adapting groove 32 is provided at one end of the mandrel 3 connected to the mandrel 1 , and the end of the cooling water pipe 2 extends into the water pipe adapting groove 32 with a gap between the end and the inner wall of the water pipe adapting groove 32 .

[0037] The end of the cooling water pipe 2 is fixed to the water pipe adapter groove 32 through a water-permeable bracket, and the cooling water returning from the cooling inner cavity 31 flows into the reflux passage 11 through the gap of the bracket.

[0038] Preferably, a water separation filter plate 33 is provided in the water pipe adapter groove 32 , and the water separation filter plate 33 faces the water outlet of the cooling water pipe 2 .

[0039] The flow of high-pressure cooling water in the cooling water pipe 2 is not stable, and needs to pass through the water separation filter plate 33 before entering the cooling cavity 31 evenly, so that the entering cooling water can fully contact the inner wall of the cooling cavity 31 to take away heat, and at the same time, it also allows the coolant returning from the cooling cavity 31 to more easily avoid the newly flowing liquid and enter the reflux path 11.

[0040] Preferably, a hemispherical inner wall is provided in the cooling inner cavity 31 near the tip of the plug 3, and a water outlet hole 34 leading to the outside is provided on the hemispherical inner wall.

[0041] The plug 3 serves as the force-bearing front end of the push rod 1. Its hollow structure reduces its strength to a certain extent. The inner wall of the hemisphere is just at the corresponding position where the outer side of the plug 3 contacts the steel billet. Therefore, the inner wall of the hemisphere is used to make up for the lack of structural strength of the plug 3.

[0042] The position where the outer side of the plug 3 contacts the steel billet is the part with the highest temperature, so a water outlet 34 is opened at this position to allow an appropriate amount of cooling water inside to flow out to the outside, thereby reducing the temperature of the position in contact with the steel billet.

[0043] Example 2

[0044] The push rod structure in Example 1 is used in a seamless steel pipe piercing machine, so that a path for cooling water to flow is formed inside the push rod 1, so that new cooling water can continuously flow through the push rod 1 and the plug 3, greatly improving the cooling effect on the push rod 3 under the high pressure of the water pump.

[0045] Among them, the cooling water flowing out from the reflux passage 11 first enters the inner cavity of the push rod mounting seat 4, and the inner cavity is close to other components of the punching machine. In the high-temperature working environment, each component will also be affected by the high temperature. The cooling water retained in the inner cavity can cool other components and improve the operating performance of the punching machine.

[0046] At the access end of the water pump, the access pipe is set to a floating design to reduce the impact of surrounding vibration on the cooling water pipe 2, so that the cooling water has a higher flow rate and eliminates the steam drum caused by vibration, thereby ensuring the cooling efficiency of the cooling water.

[0047] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A top rod structure of a seamless steel pipe perforator, comprising a top rod (1), characterized in that: A cooling water pipe (2) is passed through the hollow push rod (1), a push head (3) is provided at one end of the push rod (1), a cooling inner cavity (31) is provided in the push head (3), an end of the cooling water pipe (2) is passed into the cooling inner cavity (31), a reflux passage (11) is provided between the push rod (1) and the cooling water pipe (2), one end of the reflux passage (11) is communicated with the cooling inner cavity (31), and the other end of the reflux passage (11) is passed out from a side of the push rod (1) away from the push head (3).

2. The top rod structure of the seamless steel pipe puncher according to claim 1 is characterized in that: The mandrel (1) comprises a tail rod (12) and a connecting rod (13), one end of the connecting rod (13) is axially connected to the tail rod (12), and the other end of the connecting rod (13) is connected to the mandrel (3).

3. The top rod structure of the seamless steel pipe punching machine according to claim 2 is characterized in that: An annular reflux chamber (14) is provided on the inner wall of the connecting rod (13), the reflux passage (11) passes through the reflux chamber (14), and a reinforced lining (15) is provided on the inner wall of the reflux chamber (14).

4. The top rod structure of the seamless steel pipe punching machine according to claim 2 is characterized in that: A connecting flange (16) is provided at one end of the tail rod (12) away from the connecting rod (13); the connecting flange (16) is arranged on the top rod mounting seat (4); and the cooling water pipe (2) extends from the connecting flange (16) into the inner cavity of the top rod mounting seat (4).

5. The top rod structure of the seamless steel pipe punching machine according to claim 4 is characterized in that: The return flow passage (11) is connected to the inner cavity of the push rod mounting seat (4), a return water port is provided on the connecting flange (16), and the inner cavity of the push rod mounting seat (4) is connected to the outside through the return water port.

6. The top rod structure of the seamless steel pipe punching machine according to claim 4 is characterized in that: The cooling water pipe (2) comprises a thick pipe and a thin pipe connected to each other, the thin pipe is arranged in the tail rod (12) and the connecting rod (13), and the thick pipe is located in the inner cavity of the top rod mounting seat (4).

7. The top rod structure of the seamless steel pipe puncher according to claim 1 is characterized in that: A water pipe adapting groove (32) is provided at one end of the mandrel (3) connected to the mandrel (1), and the end of the cooling water pipe (2) extends into the water pipe adapting groove (32) and leaves a gap with the inner wall of the water pipe adapting groove (32).

8. The top rod structure of the seamless steel pipe punching machine according to claim 7, characterized in that: A water separation filter plate (33) is arranged in the water pipe adapter groove (32), and the water separation filter plate (33) is directly opposite to the water outlet of the cooling water pipe (2).

9. The top rod structure of the seamless steel pipe puncher according to claim 1, characterized in that: A hemispherical inner wall is provided in the cooling inner cavity (31) near the tip of the mandrel (3), and a water outlet hole (34) leading to the outside is provided on the hemispherical inner wall.

10. Seamless steel pipe punching machine, characterized in that: The seamless steel pipe piercing machine comprises the seamless steel pipe piercing machine top rod structure as described in any one of claims 1-9.

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