A piercing plug with cooling function for steel pipe

Abstract

The utility model relates to a steel pipe machining technical field especially discloses a steel pipe perforation top head with cooling function, including top head body, the inside of top head body is provided with cooling chamber, is provided with cooling casing in cooling chamber, is provided with water spray chamber, guide chamber and water inlet chamber in the inside of cooling casing, is provided with spray head seat in water spray chamber, is provided with the plugging seat of detachable connection in water inlet chamber end part, is provided with the mandrel in the plugging seat and penetrates, the end face of spray head seat is provided with the spray hole in the circumferential array, is provided with the nozzle in the spray hole. The utility model injects high pressure cooling water through the mandrel and spray head seat, the high pressure cooling water sprays from multiple nozzles, cools down the top head body, the high pressure cooling water drives the rotation of spray head seat to form spiral flow, accelerates the depth of heat exchange, improves the cooling efficiency of top head body, maintains the stability of top head body, the cooling water after heat exchange returns to flow and is reused through the backwater channel, avoids the accumulation in the inside of top head body and influences the cooling effect.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe processing technology, and in particular to a steel pipe perforation mandrel with cooling function. Background Technology

[0002] Hot-rolled seamless steel pipes are rolled by a piercing mill. During the production process, the billet is heated and then pierced by a mandrel. The high-temperature billet undergoes continuous deformation under the action of the mandrel, transforming a solid tube billet into a hollow tube. Because the mandrel is in contact with the high-temperature billet for a long time, continuous production can lead to problems such as mandrel deformation, wear, and cracking, reducing the service life of the mandrel and affecting the surface quality of the inner wall of the seamless steel pipe. In severe cases, it can even lead to piercing failure, causing the billet to be scrapped. Therefore, it is necessary to cool the mandrel with water during operation.

[0003] Chinese invention patent application (publication number CN115491670A) discloses a seamless steel pipe perforation mandrel, which includes a cooling pipe installed in the center hole of the side plate. The cooling pipe extends from the center of the support frame to the head of the mandrel, then bends and wraps around the outer ring of the support frame and passes through the side plate. A spiral cooling pipe is installed inside the mandrel body to facilitate cooling of the mandrel and reduce hot sticking of steel and high-temperature deformation. However, when this technical solution is used, the cooling pipe can only indirectly cool and dissipate heat inside the mandrel. The heat exchange effect is too small, the cooling effect is poor, and it has basically no impact on the high-temperature deformation of the mandrel.

[0004] Therefore, it is necessary to propose an improved steel pipe perforation mandrel with cooling function to overcome the shortcomings of the existing technology. Utility Model Content

[0005] The purpose of this invention is to solve the problems in the prior art and provide a steel pipe perforation mandrel with cooling function.

[0006] The technical solution of this utility model is:

[0007] A steel pipe perforation mandrel with cooling function includes a mandrel body, a cooling chamber inside the mandrel body, a cooling shell inside the cooling chamber, a water spray chamber, a guide chamber and a water inlet chamber arranged sequentially inside the cooling shell, a nozzle seat inside the water spray chamber, and a detachably connected sealing seat at the end of the water inlet chamber. A mandrel is inserted through the sealing seat, and one end of the mandrel passes through the water inlet chamber, the guide chamber and the water spray chamber in sequence and is connected to the nozzle seat. A spray hole is arranged in a circumferential array on the end face of the nozzle seat, the axis of the spray hole is at a set angle to the axis of the nozzle seat, and a nozzle is arranged inside the spray hole.

[0008] Preferably, the cooling housing is provided with a water return channel, the axis of which is parallel to the axis of the cooling housing, and one end of the water return channel is connected to the water spray chamber.

[0009] Preferably, the cooling housing has several return water holes on its circumference, and the return water holes are connected to the return water channel.

[0010] Preferably, the mandrel is fitted with multiple bearings in the part located in the water inlet chamber, and spacers are provided between adjacent bearings.

[0011] Preferably, a positioning boss and a sealing flange are provided on the outer circumferential surface of the cooling shell, the positioning boss is interference-fitted with the cooling chamber, and a sealing gasket is provided on one side of the sealing flange.

[0012] Preferably, a first sealing ring is provided between the mandrel and the nozzle seat, a second sealing ring is provided between the mandrel and the circumferential wall of the guide cavity, and a third sealing ring is provided between the mandrel and the sealing seat.

[0013] Preferably, the end of the sealing seat away from the head body is provided with a connector.

[0014] Preferably, a one-way valve is provided at the end of the return water channel facing away from the spray chamber.

[0015] Preferably, slots are evenly distributed around the outer circumference of the nozzle holder, and centrifugal blades are installed inside the slots.

[0016] Preferably, a spring is fitted onto the cooling housing, and the spring abuts against the sealing flange and the top rod body.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention injects high-pressure cooling water through a mandrel and nozzle seat. The high-pressure cooling water is sprayed out from multiple nozzles to directly cool the mandrel body. The high-pressure cooling water drives the nozzle seat to rotate, forming a spiral water flow, which accelerates the heat exchange speed, improves the cooling efficiency of the mandrel body, and maintains the stability of the mandrel body. The cooling water after heat exchange flows back and is reused through the return water channel, avoiding accumulation inside the mandrel body that would affect the cooling effect. Overall, the cooling effect on the mandrel body is good, reducing the probability of mandrel body failure and saving operating costs. Attached Figure Description

[0019] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0020] Figure 2 This is a three-dimensional sectional view of the present invention.

[0021] Figure 3 This is a schematic diagram of the cooling shell structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the nozzle holder structure of this utility model.

[0023] The components are as follows: 1. Top head body; 2. Top rod body; 3. Cooling chamber; 4. Cooling shell; 5. Water spray chamber; 6. Guide chamber; 7. Water inlet chamber; 8. Nozzle seat; 9. Mandrel; 10. Sealing seat; 11. Spray hole; 12. Nozzle; 13. Return water channel; 14. Return water hole; 15. Bearing; 16. Spacer; 17. Positioning boss; 18. Sealing flange; 19. Sealing gasket; 20. First sealing ring; 21. Second sealing ring; 22. Third sealing ring; 23. Connector; 24. Check valve; 25. Slot; 26. Centrifugal blade; 27. Spring. Detailed Implementation

[0024] To make the technical means, technical features, utility model purpose and technical effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations.

[0025] like Figures 1-4 As shown, a steel pipe perforation mandrel with cooling function includes a mandrel body 1, a mandrel body 2 threadedly connected to the mandrel body 1, a cooling chamber 3 machined inside the mandrel body 1, a cooling shell 4 installed inside the cooling chamber 3, a sealing seat 10 connected to one end of the cooling shell 4 facing the mandrel body 2, the sealing seat 10 being threadedly connected to the cooling shell 4 for easy disassembly and assembly, cooling water is supplied to the cooling chamber 3 through the sealing seat 10 and the cooling shell 4 to cool and reduce the temperature of the mandrel body 1 and prevent deformation during use, a return water channel 13 machined on the cooling shell 4, the axis of the return water channel 13 being parallel to the axis of the cooling shell 4 for the return flow of cooling water after heat exchange, so that the cooling water forms a circulation, accelerates the heat exchange with the mandrel body 1, and avoids the accumulation of cooling water inside the mandrel body 1 after heating, which would affect the cooling effect.

[0026] like Figures 1-4As shown, the interior of the cooling housing 4 is machined with sequentially distributed spray chambers 5, guide chambers 6, and inlet chambers 7. A sealing seat 10 is connected to the inlet chamber 7. A connector 23 is threaded onto the end of the sealing seat 10 facing away from the cooling housing 4 for connecting to an external cooling water source. A spindle 9 is installed through the interior of the sealing seat 10. A nozzle seat 8 is installed inside the spray chambers 5. One end of the spindle 9 passes sequentially through the inlet chamber 7, guide chamber 6, and spray chamber 5 before being threaded onto the nozzle seat 8. Multiple spray holes 11 are machined on one end face of the nozzle seat 8. The holes 11 are arranged in a circular array with the axis of the nozzle seat 8 as the reference. The axis of the holes 11 is at a set angle to the axis of the nozzle seat 8. The nozzles 12 are installed in the holes 11 and are threadedly connected inside the holes 11. High-pressure cooling water enters the water inlet chamber 7 through the connector 23, enters the nozzle seat 8 through the spindle 9, and is sprayed out through the nozzles 12. Since the axis of the holes 11 is at a set angle to the axis of the nozzle seat 8, the high-pressure water flow can drive the nozzle seat 8 to rotate to form a spiral water flow. Multiple nozzles 12 generate multiple spiral water flows, which together cool the inside of the top body 1 and improve the cooling effect.

[0027] To improve the smoothness of the nozzle seat 8 rotation, a bearing 15 is installed on the shaft section of the spindle 9 located in the water inlet chamber 7. There are multiple bearings 15, and adjacent bearings 15 are separated by a spacer 16. The impact of the water flow drives the nozzle seat 8 and the spindle 9 to rotate on the bearings 15, effectively reducing friction and wear.

[0028] like Figures 1-3 As shown, the return water channel 13 is connected to the spray chamber 5 of the cooling housing 4. Several return water holes 14 are machined on the circumference of the cooling housing 4, and these holes 14 are connected to the return water channel 13. Specifically, an annular groove connected to the return water channel 13 is machined on the cooling housing 4. The several return water holes 14 are connected to the return water channel 13 through the annular groove. Several through holes are machined on the inner end face of the spray chamber 5 of the cooling housing 4, and these through holes are also connected to the return water channel 13 through the annular groove. The cooling water after heat exchange accumulates in the spray chamber 5 and enters the return water channel 13 through the through holes and the annular groove. The circulating cooling water, after heat exchange in the cooling chamber 3, enters the return water channel 13 through the return water hole 14. A one-way valve 24 is installed at the end of the return water channel 13 near the water inlet chamber 7, so that the circulating water can only flow out to the outside of the cooling shell 4 through the return water channel 13 and cannot flow in the opposite direction. Multiple evenly distributed slots 25 are machined on the outer circumferential surface of the nozzle seat 8. Centrifugal blades 26 are installed in the slots 25. The rotation of the nozzle seat 8 drives the centrifugal blades 26 to rotate, which increases the flow rate of the cooling water, enhances the heat exchange efficiency, and increases the speed at which the cooling water enters the return water channel 13 for return.

[0029] like Figure 1 and Figure 2As shown, a positioning boss 17 and a sealing flange 18 are integrally machined on the outer circumferential surface of the cooling housing 4. The positioning boss 17 is interference-fitted with the cooling chamber 3 to achieve a seal between the cooling housing 4 and the cooling chamber 3. The sealing flange 18 abuts against the stepped surface of the cooling chamber 3. A sealing gasket 19 is installed on the side of the sealing flange 18 facing the cooling chamber 3. A spring 27 is fitted on the cooling housing 4. The spring 27 abuts between the sealing flange 18 and the push rod body 2. Through the connection between the push rod body 2 and the push head body 1, the spring 27 presses the cooling housing 4 tightly onto the cooling chamber 3, compressing the sealing gasket 19 to enhance the sealing effect between the cooling housing 4 and the cooling chamber 3 and prevent cooling water leakage.

[0030] like Figure 1 and Figure 2 As shown, a first sealing ring 20 is installed between the spindle 9 and the nozzle seat 8 to enhance the sealing between the spindle 9 and the nozzle seat 8. A second sealing ring 21 is installed between the spindle 9 and the circumferential wall of the guide cavity 6 to enhance the sealing between the spindle 9 and the guide cavity 6 of the cooling housing 4. A third sealing ring 22 is installed between the spindle 9 and the sealing seat 10 to enhance the sealing between the spindle 9 and the sealing seat 10. The number of the first sealing ring 20, the second sealing ring 21 and the third sealing ring 22 is at least one. Cooling water enters the water inlet cavity 7 through the connector 23. The high-pressure water flow pushes the spindle 9 so that the end face of the spindle 9 is tightly attached to the inner stepped surface of the sealing seat 10, forming an axial self-sealing. The second sealing ring 21 and the third sealing ring 22 can prevent cooling water from entering the bearing 15. The first sealing ring 20 can prevent leakage between the spindle 9 and the nozzle seat 8 and reduce the pressure of the water flow.

[0031] The working principle of this utility model is as follows:

[0032] The cooling housing 4 is installed on the cooling chamber 3 and positioned by the positioning boss 17. The push rod body 2 is connected to the top head body 1. The compression spring 27 presses the cooling housing 4 to deform the sealing gasket 19 and enhance the seal. The connector 23 is connected to an external high-pressure cooling water source. The cooling water enters the water inlet chamber 7 and pushes the end of the spindle 9 to press tightly against the sealing seat 10 to form an axial seal. The cooling water flows into the nozzle seat 8 through the spindle 9 and is sprayed out from the nozzle 12. Since the axis of the nozzle 12 is set at an angle to the axis of the nozzle seat 8, the high-pressure water flow drives the nozzle seat 8 to rotate and generate a high-pressure spiral water jet that sprays inside the top head body 1. When the top head body 1 is pierced, it is cooled down. The cooling water after heat exchange flows into the return water channel 13 through the through hole and the return water hole 14. It flows out from the return water channel 13 for collection and reuse, which improves the service life of the top head body 1, reduces costs, and increases production capacity.

[0033] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. All equivalent changes and modifications made in accordance with the scope of the claims of this utility model should fall within the technical scope of this utility model.

Claims

1. A steel pipe perforation mandrel with cooling function, comprising a mandrel body (1), characterized in that: The top body (1) is provided with a cooling chamber (3), and a cooling shell (4) is provided inside the cooling chamber (3). The cooling shell (4) is provided with a water spray chamber (5), a guide chamber (6) and a water inlet chamber (7) in sequence. The water spray chamber (5) is provided with a nozzle seat (8). The end of the water inlet chamber (7) is provided with a detachable sealing seat (10). A mandrel (9) is provided through the sealing seat (10). One end of the mandrel (9) passes through the water inlet chamber (7), the guide chamber (6) and the water spray chamber (5) in sequence and is connected to the nozzle seat (8). The nozzle seat (8) is provided with a circumferential array of spray holes (11) on the end face. The axis of the spray holes (11) is at a set angle with the axis of the nozzle seat (8). A nozzle (12) is provided inside the spray holes (11).

2. The steel pipe perforation mandrel with cooling function according to claim 1, characterized in that: The cooling housing (4) is provided with a water return channel (13), the axis of the water return channel (13) is parallel to the axis of the cooling housing (4), and one end of the water return channel (13) is connected to the water spray chamber (5).

3. The steel pipe perforation mandrel with cooling function according to claim 2, characterized in that: The cooling housing (4) has several return water holes (14) on its circumference, and the return water holes (14) are connected to the return water channel (13).

4. The steel pipe perforation mandrel with cooling function according to claim 1, characterized in that: The mandrel (9) is fitted with a plurality of bearings (15) in the part located in the water inlet cavity (7), and a spacer (16) is provided between adjacent bearings (15).

5. The steel pipe perforation mandrel with cooling function according to claim 1, characterized in that: The cooling housing (4) is provided with a positioning boss (17) and a sealing flange (18) on its outer circumferential surface. The positioning boss (17) is interference-fitted with the cooling chamber (3), and a sealing gasket (19) is provided on one side of the sealing flange (18).

6. The steel pipe perforation mandrel with cooling function according to claim 1, characterized in that: A first sealing ring (20) is provided between the spindle (9) and the nozzle seat (8), a second sealing ring (21) is provided between the spindle (9) and the circumferential wall of the guide cavity (6), and a third sealing ring (22) is provided between the spindle (9) and the sealing seat (10).

7. The steel pipe perforation mandrel with cooling function according to claim 1, characterized in that: The end of the sealing seat (10) away from the head body (1) is provided with a connector (23).

8. The steel pipe perforation mandrel with cooling function according to claim 2, characterized in that: A one-way valve (24) is provided at the end of the return water channel (13) facing away from the spray chamber (5).

9. The steel pipe perforation mandrel with cooling function according to claim 1, characterized in that: The nozzle holder (8) has slots (25) evenly distributed around its outer circumference, and centrifugal blades (26) are provided inside the slots (25).

10. The steel pipe perforation mandrel with cooling function according to claim 5, characterized in that: A spring (27) is fitted on the cooling housing (4), and the spring (27) abuts between the sealing flange (18) and the top rod body (2).

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