Reinforced perforating ejector rod

Abstract

The utility model discloses a reinforced piercing ejector rod, which comprises an ejector rod body, an ejector head connected to the end part of the ejector rod body and a cooling water pipe sleeved in the ejector rod body, the ejector head comprises an ejector head part and a connecting part, the inner wall of the ejector head part is a smooth inner wall, and the ejector head is positioned in an elliptic conical inner cavity. The shape of the flow guide ring is matched with that of the oval-cone-shaped inner cavity, an opening is formed in the front end of the flow guide ring, the rear end of the flow guide ring and the connecting part of the ejector head are integrally formed or fixedly connected, and the cooling water pipe is communicated with the rear end of the flow guide ring. The ejector rod body is further sleeved with a reinforcing sleeve, and the thickness of the reinforcing sleeve is gradually reduced backwards from the end close to the ejector head. The guide ring is arranged in the ejector head, the smooth wall surface is arranged in the ejector head, and the reinforcing sleeve is sleeved outside the ejector rod body, so that the cooling effect on the ejector head can be enhanced, the strength of the piercing ejector rod is enhanced, and finally, the durability of the piercing ejector rod is greatly enhanced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of seamless steel pipe manufacturing, especially relates to a reinforced piercing ejector rod. BACKGROUND

[0002] With the progress of science and technology, seamless steel pipes are used more and more widely in industrial production due to their good performance, and in the production of seamless steel pipes, the piercing ejector rod plays a very important role. The existing piercing ejector rod comprises a top head, a rod body and a cooling water pipe, the rod body is a hollow cylindrical rod, a connecting internal thread is arranged on the outer cylindrical surface of one end of the rod body, the top head is tightly screwed with the connecting internal thread of the rod body through the external thread of a top head connecting section, the maximum diameter of the top head is equal to the outer diameter of the rod body, and the cooling water pipe is sleeved in the inner circle of the rod body. The top head is a key tool in the production of seamless steel pipes. In the process of piercing a seamless steel pipe, the solid pipe blank is made into a hollow pipe, and the deformation of the metal mainly occurs on the top head. Therefore, the working conditions of the piercing top head are quite harsh, not only strong axial pressure has to be borne, but also strong deformation friction force between the top head and the inner wall has to be overcome. Since the diameter and wall thickness of the rod are small, the rod often vibrates greatly in the piercing process due to insufficient rigidity, which increases the internal spiral and wall thickness eccentricity of the pipe. In order to improve the rigidity and stability of the piercing rod in the piercing process, manufacturers will use a rod with a larger diameter and wall thickness. In this way, the piercing top head works under low-cycle fatigue conditions, needs to overcome strong friction force between the top head and the inner wall of the steel pipe, and the temperature of the solid pipe blank to be pierced is quite high. Long-term work under such high temperature and strong friction force will easily cause the top head to wear.

[0003] A piercing ejector rod for preventing wrinkles in the piercing of a steel pipe is disclosed in ZL 201621424953.1, but the strength of this ejector rod is still insufficient, and the top head of the ejector rod is provided with a reinforced heat dissipation groove on the inner cavity wall of the top head, which is originally used to enhance heat dissipation. However, because the groove is concave, water is easy to stay in the groove, which causes the formation of a boiling vapor film on the surface of the reinforced heat dissipation groove in the top head, thereby affecting heat exchange and further affecting the cooling effect. Therefore, people hope to find a piercing ejector rod that can avoid the formation of a boiling vapor film, has good heat exchange effect, and can further improve the durability of the piercing ejector rod. SUMMARY

[0004] The utility model aims at providing a reinforced piercing ejector rod with high strength, durability and good internal cooling effect.

[0005] The utility model is implemented by the following technical solutions:

[0006] The reinforced piercing ejector rod comprises an ejector rod body 1, a head 2 connected to the end of the ejector rod body, and a cooling water pipe 3 sleeved in the ejector rod body, the head 2 comprises a head part 21 with an elliptical inner cavity at the front end and a connecting part 22 with a hollow structure at the rear end, the head part 21 and the connecting part 22 are communicated with each other, the inner wall of the head part 21 is smooth, the connecting part 22 of the head 2 is screwed in the ejector rod body 1, one end of the cooling water pipe 3 is screwed in the connecting part 22 of the head 2, the other end of the cooling water pipe 3 is sealingly fixed in the inner circle of the tail of the ejector rod body 1 through a limiting fixing ring 5, the limiting fixing ring 5 is clamped in the gap between the ejector rod body 1 and the cooling water pipe 3, a backwater cavity 6 is formed between the ejector rod body 1 and the cooling water pipe 3, the central axis of the cooling water pipe 3 coincides with the central axis of the ejector rod body 1, a plurality of backwater holes 4 are equidistantly arranged on the connecting part of the head 2 in the axial direction, the inner cavity of the head 2 and the backwater cavity 6 are communicated through the backwater holes 4, a plurality of water outlet holes 51 are equidistantly arranged on the limiting fixing ring 5 in the axial direction, the backwater cavity 6 is communicated with the outside through the water outlet holes 51, one end of the cooling water pipe 3 is communicated with the inner cavity of the head 2, and the other end of the cooling water pipe 3 is communicated with an external water source.

[0007] The head 2 is further provided with a flow guide ring 23 with an opening at the front end in the inner part of the elliptical inner cavity, the rear end of the flow guide ring 23 is integrally formed with or fixedly connected to the connecting part 22 of the head 2, the cooling water pipe 3 is communicated with the rear end of the flow guide ring 23, and the cooling water in the cooling water pipe 3 can flow into the elliptical inner cavity of the head part after being guided by the flow guide ring 23.

[0008] The ejector rod body 1 is further sleeved with a reinforcing sleeve 7 through thread cooperation, the thickness of the reinforcing sleeve 7 gradually decreases from the end close to the head 2, and the maximum outer diameter of the reinforcing sleeve 7 is smaller than the maximum outer diameter of the head 2.

[0009] Preferably, the minimum wall thickness of the head part 21 of the head 2 is greater than or equal to 8 mm.

[0010] Preferably, the ejector rod body 1 is provided with external threads on the outer side surface at both ends, the reinforcing sleeve 7 is provided with internal threads on the inner wall at both ends, the internal threads can cooperate with the external threads at both ends of the ejector rod body 1, and the ejector rod body 1 and the reinforcing sleeve 7 are connected together at the front end and the rear end through cooperation of the internal threads and the external threads.

[0011] Preferably, the reinforcing sleeve 7 is further provided with a clamping ring 71 which can be clamped on the end of the ejector rod body at the rear end, so as to enhance the connection between the reinforcing sleeve 7 and the ejector rod body 1.

[0012] Preferably, the outer surface of the reinforcing sleeve 7 is in a stepped structure, which is gradually reduced in height from the end close to the ejector pin 2.

[0013] Preferably, 3-8 backwater holes 4 are equidistantly arranged in the axial direction of the connecting part of the ejector pin 2, and 3-8 water outlet holes 51 are equidistantly arranged in the axial direction of the limiting fixing ring 5.

[0014] More preferably, 6 backwater holes 4 are equidistantly arranged in the axial direction of the connecting part of the ejector pin 2, and 6 water outlet holes 51 are equidistantly arranged in the axial direction of the limiting fixing ring 5.

[0015] Preferably, the front end of the flow guide ring 23 extends into the two-thirds depth of the elliptical cone-shaped inner cavity of the ejector pin part 21.

[0016] The reinforced perforating ejector rod has the advantages of ingenious structure, better contact of cooling water to the surface of the ejector pin which needs to be cooled, avoidance of the problem of incomplete cooling caused by poor circulation of water in the front end part, the smooth inner wall of the ejector pin part facilitating the rapid flow of cooling water and avoiding the problem of separation of new cooling water from the wall surface to reduce the heat exchange effect, the reinforcing sleeve greatly increasing the strength of the perforating ejector rod and being not easy to break, low cost, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model will be explained through examples and in the mode of referring to the drawings, in which:

[0018] Fig. 1 It is the structural schematic diagram of the embodiment of the utility model;

[0019] Fig. 2 It is the sectional structure schematic diagram of the ejector pin connecting part. DETAILED DESCRIPTION

[0020] All the features disclosed in this specification, or all the steps of any method or process specified in this specification, may be combined in any combination, except combinations where at least some of the features and / or steps are mutually exclusive.

[0021] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0022] like Figs. 1-2 As shown, a reinforced perforated push rod includes a push rod body 1, a push head 2 connected to the end of the push rod body, and a cooling water pipe 3 fitted inside the push rod body. The push head 2 includes an integrally formed push head 21 with an elliptical conical inner cavity at the front end and a connecting part 22 with a hollow structure at the rear end. The push head 21 and the connecting part 22 are interconnected. The inner wall of the push head 21 is smooth. The connecting part 22 of the push head 2 is screwed into the push rod body 1. One end of the cooling water pipe 3 is screwed into the connecting part 22 of the push head 2, and the other end of the cooling water pipe 3 is sealed and fixedly installed on the push rod body 1 by a limiting fixing ring 5. In the inner circle of the tail, the limiting and fixing ring 5 is fitted into the gap between the push rod body 1 and the cooling water pipe 3, forming a return water cavity 6 between the push rod body 1 and the cooling water pipe 3. The central axis of the cooling water pipe 3 coincides with the central axis of the push rod body 1. Several return water holes 4 are opened at equal intervals in the axial direction of the connecting part of the push head 2. The inner cavity of the push head 2 and the return water cavity 6 are connected through the return water holes 4. Several outlet water holes 51 are opened at equal intervals in the axial direction of the limiting and fixing ring 5. The return water cavity 6 is connected to the outside through the outlet water holes 51. One end of the cooling water pipe 3 is connected to the inner cavity of the push head 2, and the other end of the cooling water pipe 3 is connected to the external water source.

[0023] The top head 2 is located inside the elliptical conical cavity and is provided with a guide ring 23 that follows the shape of the elliptical conical cavity but has an opening at the front end. The rear end of the guide ring 23 is integrally formed with or fixedly connected to the connection part 22 of the top head 2. The cooling water pipe 3 is connected to the rear end of the guide ring 23. The cooling water in the cooling water pipe 3 can flow into the elliptical conical cavity of the top head after being guided by the guide ring 23.

[0024] In addition to the top rod body 1, a reinforcing sleeve 7 is also fitted by threaded connection. The thickness of the reinforcing sleeve 7 gradually decreases from the end near the top head 2 to the rear. The maximum outer diameter of the reinforcing sleeve 7 is smaller than the maximum outer diameter of the top head 2.

[0025] The minimum wall thickness of the top head 21 of the top head 2 is greater than or equal to 8 mm.

[0026] The push rod body 1 has external threads on both ends and on the outer surface. The reinforcing sleeve 7 has internal threads on both ends and on the inner wall that can cooperate with the external threads on both ends of the push rod body 1. The push rod body 1 and the reinforcing sleeve 7 are connected together at the front and rear ends by the cooperation of internal and external threads.

[0027] The reinforcing sleeve 7 is further provided with a snap ring 71 on the rear end, which can be snapped on the rear end of the ejector rod body, so as to enhance the connection between the reinforcing sleeve 7 and the ejector rod body 1.

[0028] The outer surface of the reinforcing sleeve 7 is in a stepped structure, which is gradually reduced in height from the end close to the ejector head 2.

[0029] 3-8 backwater holes 4 are equidistantly arranged on the connecting part of the ejector head 2 in the axial direction, and 3-8 water outlet holes 51 are equidistantly arranged on the limiting fixing ring 5 in the axial direction.

[0030] 6 backwater holes 4 are equidistantly arranged on the connecting part of the ejector head 2 in the axial direction, and 6 water outlet holes 51 are equidistantly arranged on the limiting fixing ring 5 in the axial direction.

[0031] The front end of the flow guide ring 23 extends into the two-thirds depth of the elliptical cone-shaped inner cavity of the ejector head part 21.

[0032] In use, the cooling water is introduced into the perforated ejector rod from the cooling water pipe 3, and then enters the inside of the ejector head 2 through the flow guide of the flow guide ring 23 to cool the ejector head part 21, and then the cooling water flows to the outside of the ejector rod in turn through the backwater hole 4, the backwater cavity 6 and the backwater hole 51.

[0033] The reinforcing perforated ejector rod has the advantages of ingenious structure, which can make the cooling water better contact the surface of the ejector head that needs to be cooled, avoids the problem of poor circulation of water in the front end part and causes incomplete cooling, and the inner wall of the ejector head part is provided as a smooth inner wall, so that the cooling water can flow quickly and not gather, and the problem of the boiling gas film formed on the wall surface and the new cooling water separated from the wall surface to reduce the heat exchange effect is avoided; the reinforcing sleeve is sleeved outside the ejector rod body, and the thickness of the reinforcing sleeve gradually decreases from front to back, so that the strength of the perforated ejector rod can be greatly increased, the perforated ejector rod is not easy to break, and the cost is low, so that the cooling effect of the ejector head and the strength of the perforated ejector rod can be enhanced by arranging the flow guide ring in the ejector head, providing the smooth wall surface in the ejector head and sleeving the reinforcing sleeve outside the ejector rod body, and the durability of the perforated ejector rod is greatly enhanced, the practicability is high, and the perforated ejector rod is worth promoting.

[0034] The utility model is not limited to the foregoing specific embodiments. The utility model extends to any new feature or any new combination disclosed in the specification, and any new method or process step or any new combination disclosed.

Claims

1. A reinforced piercing ejector rod comprising an ejector rod body (1), a nose (2) connected to the end of the ejector rod body, and a cooling water pipe (3) sleeved in the ejector rod body, the nose (2) comprising an integrally formed nose part (21) with an elliptical cone-shaped inner cavity at the front end and a connecting part (22) with a hollow structure at the rear end, the nose part (21) and the connecting part (22) being in communication with each other, characterized in that, The inner wall of the top head part (21) is a smooth inner wall, the connecting part (22) of the top head (2) is screwed in the top rod body (1), one end of the cooling water pipe (3) is screwed in the connecting part (22) of the top head (2), the other end of the cooling water pipe (3) is sealingly and fixedly installed in the tail inner circle of the top rod body (1) through the limiting fixing ring (5), the limiting fixing ring (5) is clamped in the gap between the top rod body (1) and the cooling water pipe (3), a backwater cavity (6) is formed between the top rod body (1) and the cooling water pipe (3), the central axis of the cooling water pipe (3) coincides with the central axis of the top rod body (1), a plurality of backwater holes (4) are equidistantly arranged on the connecting part of the top head (2) in the axial direction, the inner cavity of the top head (2) is communicated with the backwater cavity (6) through the backwater holes (4), a plurality of water outlet holes (51) are equidistantly arranged on the limiting fixing ring (5) in the axial direction, the backwater cavity (6) is communicated with the outside through the water outlet holes (51), one end of the cooling water pipe (3) is communicated with the inner cavity of the top head (2), the other end of the cooling water pipe (3) is communicated with the external water source; The top head (2) is further provided with a flow guide ring (23) inside the elliptical inner cavity, the flow guide ring (23) is formed integrally with the connecting part (22) of the top head (2) or is fixedly connected with the connecting part (22) of the top head (2), the cooling water pipe (3) is communicated with the rear end of the flow guide ring (23), and the cooling water in the cooling water pipe (3) can flow into the elliptical inner cavity of the top head part after being guided by the flow guide ring (23). The top rod body (1) is further provided with a reinforcing sleeve (7) through thread cooperation, the thickness of the reinforcing sleeve (7) gradually decreases from the end close to the top head (2) to the rear end, and the maximum outer diameter of the reinforcing sleeve (7) is smaller than the maximum outer diameter of the top head (2).

2. The reinforced piercing ejector rod of claim 1, wherein, The minimum wall thickness of the top head part (21) of the top head (2) is greater than or equal to 8 mm.

3. The reinforced piercing ejector rod of claim 1, wherein, The top rod body (1) is provided with external threads on the outer side surfaces of both ends, the reinforcing sleeve (7) is provided with internal threads on the inner walls of both ends, the internal threads can cooperate with the external threads on the two ends of the top rod body (1), and the top rod body (1) and the reinforcing sleeve (7) are connected together through cooperation of the internal threads and the external threads on the front end and the rear end.

4. The reinforced piercing ejector rod of claim 1, wherein, The reinforcing sleeve (7) is further provided with a clamping ring (71) on the rear end, which can be clamped on the rear end of the top rod body, so as to enhance the connection between the reinforcing sleeve (7) and the top rod body (1).

5. The reinforced piercing ejector rod of claim 1, wherein, The outer surface of the reinforcing sleeve (7) is in a stepped structure, and the stepped structure gradually decreases in step height from the end close to the top head (2) to the rear end.

6. The reinforced piercing ejector rod of claim 1, wherein, 3-8 backwater holes (4) are equidistantly arranged on the connecting part of the top head (2) in the axial direction, and 3-8 water outlet holes (51) are equidistantly arranged on the limiting fixing ring (5) in the axial direction.

7. The reinforced piercing ejector rod of claim 1, wherein, The front end of the flow guide ring (23) extends to a depth of two-thirds of the elliptical inner cavity of the top head part (21).

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