A piercing device with inner wall powder spraying antioxidant and top head cooling function

Abstract

The utility model relates to a perforating device with inner wall powder spraying anti -oxidation and punch cooling function relates to seamless steel tube production technical field. Including the top rod trolley, the top rod trolley includes the car body, rotates and is installed with hollow main shaft in the car body, and the front end of hollow main shaft is connected hollow top rod, and the front end of hollow top rod is connected with punch, and the front end of hollow top rod is provided with the closed annular powder spraying cavity, and the outer wall is provided with the powder spraying hole of intercommunication annular powder spraying cavity, and the hollow top rod is placed with powder spraying pipe, and the front end of powder spraying pipe is connected with annular powder spraying cavity, and the hollow top rod is still placed with cooling water pipe, and the front end of cooling water pipe extends to punch, and the tail end of cooling water pipe stretches out top rod trolley, and with the car body of top rod trolley fixed for input cooling water source, the utility model separates powder pipe and water pipe thoroughly, and solves the problem of powder pipe water leakage thoroughly. Using the utility model can solve punch cooling, can realize steel pipe inner wall powder spraying, reduces oxidation to improve the quality of the inside of the shell tube.

Description

Technical Field

[0001] This invention relates to the field of seamless steel pipe production technology, specifically to a perforation device with internal wall powder spraying for oxidation resistance and mandrel cooling function. Background Technology

[0002] Hot-rolled seamless tubes are rolled by a piercing mill. The basic process of piercing rolling is as follows: a semi-closed die is formed by rolls, guide plates, and mandrels. High-temperature metal undergoes continuous deformation within this die area, and finally, a hollow tube is rolled from a solid billet.

[0003] Since metal deformation mainly occurs on the mandrel, and the mandrel operates under high temperature and pressure, it is easily worn or the nose is crushed, causing the mandrel to be unusable for a long time and requiring frequent replacement. Water cooling is also necessary for the mandrel.

[0004] During high-temperature piercing, the inner wall of the capillary tube is rapidly oxidized due to the continuous intrusion of cold air. This urgently requires an anti-oxidant powder to be sprayed into the hot capillary tube to reduce oxidation and improve the quality of the capillary tube. Currently, the solution to this problem is to spray nitrogen into the steel pipe. However, since the two ends of the pierced capillary tube are open, the oxidation phenomenon cannot be completely solved.

[0005] Therefore, the applicant designed a product as follows Figure 7-11The device shown includes a top cooling and capillary inner wall powder spraying device, comprising a top rod carriage 34, a top rod 21 connected to the front end of the top rod carriage 34, a coupling 23 connected to the front end of the top rod 21 via a protective sleeve 22, and a top head 24 connected to the front end of the coupling 23. A powder tube 25 (for conveying antioxidants) is coaxially inserted inside the top rod 21, and a water inlet pipe 26 is coaxially sleeved outside the powder tube 25. The protective sleeve 22 has a first large-diameter hole 27, a small-diameter hole 28, and a second large-diameter hole 29 arranged sequentially from left to right at its center. The front end of the powder tube 25 passes through the first large-diameter hole 27 and is then sealed inside the small-diameter hole 28, sealing the front end of the small-diameter hole 28 and forming a powder spraying chamber communicating with the powder tube 25. A powder spraying hole 10 communicating with the powder spraying chamber is provided on the side wall of the protective sleeve 22. The water pipe 26 is sealed inside the first large-diameter hole 27. Inside the bore 27, the side wall of the protective sleeve 26 is also provided with a water inlet 31 that connects the first large diameter bore 27 and the second large diameter bore 29. The outer end of the second large diameter bore 29 is closed and connected to a water outlet pipe 30 that extends into the top head 24. The water outlet pipe 30 forms a return water cavity 32 between the bundle joint 23 and the top head 24. The side wall of the protective sleeve 22 is also provided with a return water hole 33 that connects to the return water cavity 32. The rear ends of the powder pipe 25 and the water pipe 26 extend backwards to the top rod trolley 34 and are connected to the pressure water source and the antioxidant input source through the rotary joint 35. In order to ensure a reliable seal between the water inlet pipe 26 and the rotary joint 35 and between the powder pipe 25, multiple seals 36 need to be set between the water inlet pipe 26 and the rotary joint 35 and between the powder pipe 25 and the rotary joint 35 to avoid water leakage.

[0006] During operation, cooling water is input into the top head 24 through the inlet pipe 26, inlet hole 31, and outlet pipe 30 to cool the top head 24. After cooling, the water is output through the return water chamber 32 and return water hole 33. The antioxidant is input into the powder spraying chamber through the powder pipe 25 and finally sprayed onto the pipe wall under high pressure through the powder spraying hole 40.

[0007] In actual use, the above-mentioned top cooling and capillary inner wall powder spraying device is prone to water leakage at the sealing parts due to its complex structure and the fact that both the water source and the powder source are transported under high pressure. This can cause water to enter the powder pipe, thereby clogging the end powder pipe. Moreover, once clogged, the powder melts at the end under high temperature, which aggravates the blockage and renders the equipment unusable. Summary of the Invention

[0008] The purpose of this invention is to provide a perforation device with internal wall powder coating for oxidation resistance and top cooling function, which can effectively solve the problems in the background art.

[0009] The technical solution to achieve the above objectives is: a perforating device with internal wall powder spraying for anti-oxidation and top cooling functions, comprising a top rod carriage, the top rod carriage including a carriage body, a hollow main shaft rotatably mounted inside the carriage body, the front end of the hollow main shaft being connected to a coaxially arranged hollow top rod, the front end of the hollow top rod being connected to a top, the top being provided with a cavity with a rear end opening and communicating with the hollow top rod, characterized in that: the front end of the hollow top rod is provided with a closed annular powder spraying cavity, the outer wall is provided with a powder spraying hole communicating with the annular powder spraying cavity, a powder spraying pipe is inserted inside the hollow top rod, the front end of the powder spraying pipe is connected to the annular powder spraying cavity, the rear end of the powder spraying pipe is used to input antioxidant, a cooling water pipe is also inserted inside the hollow top rod, the front end of the cooling water pipe extends into the top and is used to input cooling water into the top, the tail end of the cooling water pipe extends out of the top rod carriage and is fixed to the carriage body of the top rod carriage for inputting cooling water source.

[0010] Furthermore, the front end of the hollow spindle is provided with a flange edge, and the rear end of the hollow push rod is fixed to the flange edge at the front end of the hollow spindle through the push rod flange. The push rod flange and the hollow push rod are sealed and fixed. An annular pressure cap is fitted on the outer wall of the push rod flange. An annular input end powder spraying chamber is provided between the annular pressure cap and the push rod flange. The annular pressure cap is also provided with multiple powder spraying inlets that connect to the input end powder spraying chamber. The powder spraying inlets are used to connect to the antioxidant input source. Rotary seals are respectively provided between the annular pressure caps on both sides of the input end powder spraying chamber and the push rod flange. The annular pressure caps are fixedly installed on the body of the push rod trolley through a connecting bracket.

[0011] Furthermore, the powder spraying pipe is provided in multiple sections and arranged circumferentially along the top rod. The tail end of the powder spraying pipe is bent outward at 90° to form a vertical bend section. The vertical bend section passes through the side wall of the hollow top rod and is sealed and welded to the side wall of the hollow top rod. One end of the vertical bend section extending out of the hollow top rod is bent at 90° toward the top rod flange to form a horizontal bend section. The horizontal bend section is connected to the top rod flange and communicates with the input end powder spraying chamber.

[0012] Furthermore, the rear end of the push rod trolley is connected to a closed water chamber, and the bottom end of the closed water chamber is provided with a water outlet. The rear end of the hollow main shaft extends rearward into the closed water chamber and a rotating sealing ring is provided between it and the closed water chamber. The rear end of the cooling water pipe extends rearward out of the closed water chamber.

[0013] Furthermore, a protective sleeve is connected to the front end of the hollow top rod, and the front end of the protective sleeve is connected to the top head through a coupling.

[0014] Furthermore, the hollow top rod is fixed with a plurality of support frames arranged at intervals. The support frame is a hollow ring body, and the circumference of the support frame is provided with through holes arranged coaxially with the powder spraying pipe. The powder spraying pipe passes through the through holes.

[0015] The beneficial effects of this invention are: This invention completely separates the powder pipe and the water pipe, thus completely solving the problem of water leakage inside the powder pipe. Using this invention solves both the cooling of the nozzle and enables powder coating of the inner wall of the steel pipe, reducing oxidation and thereby improving the internal quality of the capillary tube. In this invention, the water pipe is fixed to the body of the push rod trolley and is in a fixed state. The push rod, protective sleeve, clamp and top head connected to each other are rotatably arranged relative to the water pipe. Therefore, the rotary joint and the seal between the water pipe and the rotary joint and between the powder pipe and the rotary joint are omitted, and the occurrence of water leakage is completely eliminated. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Enlarged view of section A in the middle; Figure 3 for Figure 1 Enlarged view of section B; Figure 4 for Figure 1 Enlarged view of section C; Figure 5 for Figure 2 Enlarged view of section A in the middle; Figure 6 for Figure 2 Enlarged view of section B; Figure 7 Here is a structural diagram of an existing perforation device; Figure 8 for Figure 7 Enlarged view of section A; Figure 9 for Figure 7 Enlarged view of section B; Figure 10 for Figure 9 Enlarged view of section A; Figure 11 for Figure 7 Enlarged view of section C. Detailed Implementation

[0017] like Figure 1-6As shown, this invention discloses a perforation device with internal wall powder coating for anti-oxidation and mandrel cooling functions. It includes a mandrel carriage 1, which comprises a carriage body 1.1. A horizontally arranged hollow main shaft 1.2 is rotatably mounted inside the carriage body 1.1 via bearings. The front end of the hollow main shaft 1.2 is connected to a coaxially arranged hollow mandrel 3. The front end of the hollow mandrel 3 is threadedly connected to a protective sleeve 4. The protective sleeve 4 can be made of, but is not limited to, 45# steel. The front end of the protective sleeve 4 is threadedly connected to a retaining section 5. The front end of the retaining section 5 is threadedly connected to a mandrel 6. The outer diameters of the protective sleeve 4 and the retaining section 5 are smaller than the maximum diameter of the mandrel 6. When the mandrel 6 needs to be disassembled, the threaded connection between the retaining section 5 and the protective sleeve 4 can be directly disassembled, avoiding frequent disassembly of the mandrel 6 and the resulting wear and damage to the threads of the mandrel 6.

[0018] The top head 6 is provided with a cavity with an open rear end and is connected to the hollow top rod 3 through the central hole of the tie joint 5 and the protective sleeve 4. The front end of the hollow main shaft 1.2 is provided with a flange edge 2.1. The rear end of the hollow top rod 3 is fixed to the flange edge 2.1 at the front end of the hollow main shaft 1.2 through the top rod flange 7. The top rod flange 7 is sealed and fixed to the hollow top rod 6. An annular pressure cap 8 is fitted on the outer wall of the top rod flange 7. An annular input end powder spraying chamber 9 is provided between the annular pressure cap 8 and the top rod flange 7. The annular pressure cap 8 is also provided with multiple powder spraying inlets 10 that connect to the input end powder spraying chamber 9. The powder spraying inlets 10 are used to connect to the antioxidant input source. Rotary seals 11 are respectively provided between the annular pressure cap 8 on both sides of the input end powder spraying chamber 9 and the top rod flange 7. The annular pressure cap 8 is fixedly installed on the body 1.1 of the top rod trolley 1 through the connecting bracket 12.

[0019] The hollow top rod 3 has a closed annular powder spraying chamber 13 at its front end and multiple powder spraying holes 15 on its outer wall that connect to the annular powder spraying chamber 13. Multiple powder spraying pipes 14 are arranged at intervals along the circumference of the hollow top rod 3 inside the hollow top rod 3. The front end of the powder spraying pipe 14 is connected to the annular powder spraying chamber 13. The tail end of the powder spraying pipe 14 is bent outward at 90° to form a vertical bend section 14.1. The vertical bend section 14.1 passes through the side wall of the hollow top rod 3 and is sealed and welded to the side wall of the hollow top rod 3. The end of the vertical bend section 14.1 that extends out of the hollow top rod 3 is bent at 90° toward the top rod flange 7 to form a horizontal bend section 14.2. The horizontal bend section 14.2 is connected to the top rod flange 7 and is connected to the input end powder spraying chamber 9.

[0020] As a further improvement of this embodiment, a plurality of support frames 16 are fixed in the hollow top rod 6 at intervals. The support frame 16 is a hollow ring body. The circumference of the support frame 16 is provided with through holes 16.1 that are coaxially arranged with the powder spraying pipe 14 and whose diameter matches the outer diameter of the powder spraying pipe 14. The powder spraying pipe 14 passes through the through holes 16.1.

[0021] The hollow push rod 6 is also equipped with a cooling water pipe 17. The front end of the cooling water pipe 17 extends into the push head 6 for inputting cooling water into the push head. The rear end of the push rod trolley 1 is connected to a closed water cavity 18. The bottom end of the closed water cavity 18 is provided with a water outlet 19. The rear end of the hollow main shaft 1.2 extends rearward into the closed water cavity 18 and a rotating sealing ring 20 is provided between it and the closed water cavity 18. The rear end of the cooling water pipe 17 extends rearward out of the closed water cavity 18 and is fixed to the body 1.1 of the push rod trolley. The cooling water pipe 17 is clearance-fitted with the hollow main shaft 1.2, push rod flange 7, support frame 16, protective sleeve 4, tie section 5, and push head 5, so that the interconnected hollow main shaft 1.2, push rod flange 7, support frame 16, protective sleeve 4, tie section 5, and push head 6 can rotate relative to the cooling water pipe 17.

[0022] The working process of this invention: Water cooling at the top: The high-pressure cooling water source is directly connected to the rear inlet of the cooling water pipe 17. The high-pressure cooling water is input forward into the top head 6, where heat exchange is formed. Then, it flows back through the gap between the cooling water pipe 17 and the hollow top head 6, and finally outputs through the outlet 19 (a water receiving trough is provided below the outlet).

[0023] Antioxidant on pipe wall: Antioxidant powder delivered by high-pressure gas is fed into the powder spraying chamber 9 through the powder spraying inlet 10, then enters the annular powder spraying chamber 13 through the powder spraying pipe 14, and finally is sprayed onto the inner wall of the capillary tube through the powder spraying hole 15 to prevent oxidation of the inner wall of the capillary tube 20.

Claims

1. A perforating device with internal wall powder coating for oxidation resistance and mandrel cooling function, comprising a mandrel carriage, the mandrel carriage including a carriage body, a hollow main shaft rotatably mounted inside the carriage body, a hollow mandrel coaxially arranged at the front end of the hollow main shaft, a mandrel connected at the front end of the hollow mandrel, the mandrel having a cavity with a rear end opening and communicating with the hollow mandrel, characterized in that: The hollow push rod has a closed annular powder spraying chamber at its front end and powder spraying holes on its outer wall that connect to the annular powder spraying chamber. A powder spraying pipe is inserted inside the hollow push rod, with its front end connected to the annular powder spraying chamber and its rear end used to input antioxidants. A cooling water pipe is also inserted inside the hollow push rod, with its front end extending into the push head for inputting cooling water into the push head and its tail end extending out of the push rod trolley and fixed to the body of the push rod trolley for inputting cooling water.

2. The perforation device with inner wall powder coating for oxidation resistance and top cooling function according to claim 1, characterized in that: The hollow spindle has a flange at its front end. The rear end of the hollow push rod is fixed to the flange at the front end of the hollow spindle via the push rod flange. The push rod flange and the hollow push rod are sealed and fixed. An annular cover is fitted on the outer wall of the push rod flange. An annular input end powder spraying chamber is provided between the annular cover and the push rod flange. The annular cover is also provided with multiple powder spraying inlets that connect to the input end powder spraying chamber. The powder spraying inlets are used to connect to an antioxidant input source. Rotary seals are provided between the annular cover on both sides of the input end powder spraying chamber and the push rod flange. The annular cover is fixedly installed on the body of the push rod trolley via a connecting bracket.

3. The perforation device with inner wall powder coating for oxidation resistance and top cooling function according to claim 2, characterized in that: The powder spraying pipes are provided in multiple sections and arranged circumferentially along the top rod. The tail end of the powder spraying pipe is bent outward at 90° to form a vertical bend section. The vertical bend section passes through the side wall of the hollow top rod and is sealed and welded to the side wall of the hollow top rod. One end of the vertical bend section extending out of the hollow top rod is bent at 90° toward the top rod flange to form a horizontal bend section. The horizontal bend section is connected to the top rod flange and communicates with the input powder spraying chamber.

4. The perforation device with inner wall powder coating for oxidation resistance and top cooling function as described in claim 1, characterized in that: The rear end of the push rod trolley is connected to a closed water chamber, and the bottom end of the closed water chamber is provided with a water outlet. The rear end of the hollow main shaft extends backward into the closed water chamber and a rotating sealing ring is provided between it and the closed water chamber. The rear end of the cooling water pipe extends backward out of the closed water chamber.

5. A perforating device with inner wall powder coating for oxidation resistance and top cooling function as described in claim 1, characterized in that: The hollow top rod is connected to a protective sleeve at its front end, and the front end of the protective sleeve is connected to the top head via a coupling.

6. The perforation device with inner wall powder coating for oxidation resistance and top cooling function according to claim 1, characterized in that: The hollow top rod has multiple support frames fixed at intervals. Each support frame is a hollow ring-shaped body. The circumference of the support frame is provided with through holes arranged coaxially with the powder spraying pipe. The powder spraying pipe passes through the through holes.

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