A drawing tool for small-bore stainless steel pipe production

Abstract

The present application relates to the technical field of drawing technology for stainless steel pipe production, in particular to a drawing tool for small-bore stainless steel pipe production, comprising an outer die mechanism, the two ends of the outer die mechanism are respectively provided with a guide mechanism and a driving base, the upper part of the guide mechanism is provided with a core rod mechanism and a receiving mechanism, and the one end of the core rod mechanism is provided with an inner die mechanism; the present application is provided with a spherical section at the end of the gas conveying pipe, and a ring-shaped distribution of jet heads is opened at the side edge thereof, the jet heads are oppositely arranged with the oil outlet, and the gas conveying pipe extends to the inside of the head end of the steel pipe; in the drawing process, the airflow sprayed by the jet heads can gently guide the lubricating oil discharged from the oil outlet to the deformation area, playing an auxiliary lubricating role; and when the drawing is completed, the airflow can blow and discharge the residual lubricating oil on the inner wall of the steel pipe to the direction of the oil outlet, avoiding the residual lubricating oil in the finished steel pipe, and ensuring the cleanliness of the inner wall of the finished pipe and the subsequent processing quality.

Description

Technical Field

[0001] This invention relates to the field of stainless steel pipe production drawing technology, specifically a drawing tool for producing small-diameter stainless steel pipes. Background Technology

[0002] Small-diameter steel pipe drawing machines are metal plastic processing equipment that performs secondary cold processing on hot-rolled and extruded steel pipe blanks at room temperature. Their core working principle is to use strong tensile force (usually provided by hydraulic or chain transmission systems) to forcefully pull the pre-treated steel pipe with mandrel and mandrel inserted through a drawing die with a slightly smaller diameter, thereby accurately reducing the outer diameter and wall thickness of the steel pipe and significantly improving its surface finish, dimensional accuracy and concentricity.

[0003] The inventors have discovered at least the following problems in the prior art: In the existing technology, when the drawing tool lubricates the inner wall of the steel pipe, it usually only injects lubricating oil into the inner wall of the steel pipe through a simple oil hole or oil groove. It is difficult to accurately deliver the lubricating oil to the drawing deformation area, resulting in a large amount of lubricating oil flowing to the non-working area. This not only wastes lubricating oil, but also makes the lubrication of the drawing deformation area insufficient, resulting in high drawing resistance, affecting the surface quality of the inner wall of the steel pipe, and increasing energy consumption. In existing technologies, after the drawing process is completed, a large amount of lubricating oil is often left on the inner wall of the steel pipe. This residual lubricating oil requires a special cleaning process to remove, which increases the production process and cost. Moreover, if the cleaning is not thorough, the residual oil will affect the quality of subsequent processing (such as welding and polishing) of the finished steel pipe, and may even affect the performance of the product.

[0004] Therefore, this solution provides a drawing tool for the production of small-diameter stainless steel pipes to solve the above problems. Summary of the Invention

[0005] To address the problems of inaccurate inner wall lubrication and residue on the inner wall of the steel pipe after drawing in existing technologies, this invention provides a drawing tool for the production of small-diameter stainless steel pipes to solve the above problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A drawing fixture for producing small-diameter stainless steel pipes includes an outer mold mechanism. The outer mold mechanism has a guide mechanism and a drive base at each end. A mandrel mechanism and a receiving mechanism are located above the guide mechanism. An inner mold mechanism is located at one end of the mandrel mechanism. An air pump and an oil pump are located below the mandrel mechanism. A feeding rack is located on one side of the drive base. The outer mold mechanism includes a lubrication box and an outer mold mounted above the lubrication box via a bracket. The inner mold mechanism includes an inner mold and an air supply pipe inserted into the interior of the inner mold. The mandrel mechanism includes a mandrel and a tee pipe at the end of the mandrel away from the inner mold mechanism. The guide mechanism includes a guide base and side plates fixedly connected to both sides above the guide base. The receiving mechanism includes telescopic receiving blocks and sliders distributed vertically.

[0007] Preferably, one end of the inner mold is connected to the periphery of one end of the mandrel via a connecting pipe thread. The inner mold is provided with an oil chamber through which an air supply pipe passes. A ring-shaped distribution of pipes is provided on one side of the oil chamber, and an oil outlet is provided on the end face of the pipes at the end of the inner mold.

[0008] Preferably, one end of the gas delivery pipe is provided with a spherical section, and the side edge of the spherical section is provided with annularly distributed jet nozzles.

[0009] Preferably, one end of the three-way pipe is equipped with an oil delivery end, the other end of the three-way pipe is threaded to the periphery of the mandrel, the upper end of the three-way pipe is equipped with an air delivery end, the end of the air delivery end located inside the three-way pipe is connected to a hose, the hose is connected to an air delivery pipe, the air delivery end is connected to the output end of the air pump, and the oil delivery end is connected to the output end of the oil pump.

[0010] Preferably, one end of the guide base is fixedly connected to a sliding base, a slide block is slidably connected above the sliding base, an installation sleeve is rotatably connected above the slide block, and the mandrel is sleeved in the installation sleeve and connected with a nut.

[0011] Preferably, a guide groove is provided above the guide base, one end of the guide groove is inclined toward the lubrication box, and the slider is located inside the guide groove.

[0012] Preferably, the slider is rotatably connected to two guide wheels, and a telescopic receiving block is inserted above the slider. The telescopic receiving block has a through hole, and the inner wall of the through hole is embedded with balls. The diameter of the through hole is larger than that of the mandrel.

[0013] Preferably, one side of the side plate is provided with a uniformly distributed limiting groove, and an inclined support plate is provided between the side plates. A uniformly distributed limiting slider is fixedly connected to the outside of the inclined support plate.

[0014] Preferably, the limiting slider is slidably connected to the inside of the limiting groove, and an adjusting bolt is threadedly connected to the top of the side plate, with the bottom of the adjusting bolt rotatably connected to the limiting slider.

[0015] Preferably, a slidably connected clamping puller is provided above the drive base, an oil pump is provided on the outside of the lubrication box, and a bellows is connected to the output end of the oil pump.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention establishes an oil chamber within the inner mold and a mandrel mechanism, with annularly distributed pipes and oil outlets. During the drawing process, an oil pump delivers lubricating oil into the oil chamber via a tee pipe and the inner hole of the mandrel, ultimately discharging it from the oil outlet to the inner wall of the steel pipe. Simultaneously, the oil outlet is located on the end face of the inner mold, directly opposite the drawing deformation area, ensuring that the lubricating oil is precisely confined within the excessive drawing deformation area on the inner side of the steel pipe. This prevents the disorderly diffusion of lubricating oil into non-working areas, thereby significantly improving lubrication efficiency and reducing drawing resistance.

[0017] This invention features a spherical section at the end of the gas supply pipe, with annularly distributed jet nozzles on its side edge. These jet nozzles are positioned opposite the oil outlet, and the gas supply pipe extends to the inner side of the steel pipe's heading end. During the drawing process, the airflow from the jet nozzles gently guides the lubricating oil discharged from the oil outlet towards the deformation area, thus providing auxiliary lubrication. Upon completion of the drawing process, the airflow sweeps away and discharges any remaining lubricating oil from the inner wall of the steel pipe towards the oil outlet, preventing lubricating oil residue inside the finished steel pipe and ensuring the cleanliness of the inner wall of the finished pipe and the quality of subsequent processing.

[0018] This invention includes a receiving mechanism comprising a telescopic receiving block and a slider distributed vertically. Guide wheels one and two are rotatably connected to both sides of the slider. Ball bearings are embedded in the inner wall of a through-hole in the telescopic receiving block, and the diameter of the through-hole is larger than that of the mandrel. During the drawing process, because one end of the guide groove on the guide base is inclined towards the lubrication box, and guide wheels one and two have a height difference, the receiving mechanism can slide synchronously with the direction of steel pipe movement. The telescopic receiving block provides continuous and stable support to the middle of the mandrel, and the ball bearings reduce friction. This structure prevents the mandrel from bending and deforming due to excessive overhang during long-stroke drawing, improving drawing accuracy and extending the mandrel's service life.

[0019] This invention features a guide groove above the guide base, with one end of the guide groove inclined toward the lubrication box. Simultaneously, a through groove connecting the guide groove to the inside of the guide base is provided at the end of the guide base near the lubrication box. During the drawing process, residual lubricating oil flowing out from the non-drawing end of the steel pipe can flow to the top of the guide base and, guided by the inclination of the guide groove, flow back into the lubrication box through the through groove, thus achieving automatic recovery and recycling of lubricating oil. This reduces lubricating oil waste, lowers production costs, and prevents lubricating oil from overflowing on the workbench, maintaining a clean production environment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the external mold mechanism of the present invention; Figure 3 For the present invention Figure 1 A schematic diagram of the middle section; Figure 4 This is a cross-sectional view of the internal mold mechanism of the present invention; Figure 5 This is a schematic diagram of the mandrel mechanism of the present invention; Figure 6 This is a schematic diagram of the receiving mechanism of the present invention; Figure 7 This is a schematic diagram of the disassembled structure of the guiding mechanism of the present invention; Figure 8 This is a schematic diagram of the internal structure of the guide base of the present invention; Figure 9 This is a schematic diagram of the structure of the clamping puller and the loading rack of the present invention.

[0021] In the picture: 1. External mold mechanism; 11. Lubrication box; 12. Support; 13. External mold; 14. Oil pump; 15. Bellows; 2. Internal mold mechanism; 21. Internal mold; 211. Connecting pipe; 22. Oil chamber; 23. Pipeline; 231. Oil outlet; 24. Gas supply pipe; 25. Spherical section; 26. Jet nozzle; 3. Mandrel mechanism; 31. Mandrel; 32. Tee; 33. Oil delivery end; 34. Gas delivery end; 341. Hoses; 35. Sliding base; 36. Slide; 37. Mounting sleeve; 38. Nut; 4. Guide mechanism; 41. Guide base; 42. Side plate; 43. Limiting groove; 44. Inclined support plate; 45. Limiting slider; 46. Adjusting bolt; 47. Guide groove; 5. Receiving mechanism; 51. Slider; 52. Guide wheel one; 53. Guide wheel two; 54. Telescopic receiving block; 55. Through hole; 56. Ball bearing; 6. Air pump; 7. Oil pump; 8. Clamp pulling cart; 81. Drive base; 9. Loading rack. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Example: Please refer to Figures 1-9 The drawing fixture for producing small-diameter stainless steel pipes shown includes an outer mold mechanism 1. The outer mold mechanism 1 has a guide mechanism 4 and a drive base 81 at both ends. The guide mechanism 4 has a mandrel mechanism 3 and a receiving mechanism 5 above it. The mandrel mechanism 3 has an inner mold mechanism 2 at one end. The mandrel mechanism 3 has an air pump 6 and an oil pump 7 below it. The drive base 81 has a feeding rack 9 on one side. The outer mold mechanism 1 includes a lubrication box 11 and an outer mold 13 mounted on top of the lubrication box 11 via a bracket 12; The inner mold mechanism 2 includes an inner mold 21 and an air supply pipe 24, with the air supply pipe 24 inserted inside the inner mold 21; The mandrel mechanism 3 includes a mandrel 31 and a three-way tube 32 at the end of the mandrel 31 away from the inner mold mechanism 2; The guide mechanism 4 includes a guide base 41 and side plates 42 fixedly connected to both sides above the guide base 41; The receiving mechanism 5 includes telescopic receiving blocks 54 and sliders 51 distributed vertically. Among them, the outer mold mechanism 1 is the mother mold tooling in the existing drawing machine. The drawing machine has its own control equipment, which can control the operation of other equipment; the feeding rack 9 is used to place the steel pipe after the heading process, and its outer side can be connected to the feeding mechanism, so as to continuously feed the material. A support frame is provided below the guide mechanism 4 to support the guide mechanism 4 and the sliding base 35.

[0024] In this embodiment, one end of the inner mold 21 is threaded to the periphery of one end of the mandrel 31 via the connecting pipe 211. The inner mold 21 is provided with an oil chamber 22 through which the gas supply pipe 24 passes. A ring-shaped pipe 23 is provided on one side of the oil chamber 22. An oil outlet 231 is provided on the end face of the pipe 23 at the end of the inner mold 21. Among them, the connecting pipe 211 and the inner mold 21 are integral, and the left and right openings of the oil chamber 22 are respectively adapted to the inner holes of the air supply pipe 24 and the core rod 31, so that the lubricating oil can only flow out from the pipe 23 after entering its interior.

[0025] In this embodiment, a spherical section 25 is provided at one end of the gas delivery pipe 24, and annularly distributed jet nozzles 26 are provided on the side edge of the spherical section 25; Among them, the spherical section 25 is a circular protrusion with an inclined surface at a 45-degree angle on one side, and the jet head 26 is located at this inclined surface. Therefore, the airflow ejected from the jet head 26 will rush towards the inner wall of the steel pipe, and the diameter of the air supply pipe 24 and the spherical section 25 is smaller than that of the steel pipe.

[0026] In this embodiment, one end of the three-way pipe 32 is equipped with an oil delivery end 33, and the other end of the three-way pipe 32 is threaded to the periphery of the mandrel 31. An air delivery end 34 is installed at the upper end of the three-way pipe 32. One end of the air delivery end 34 located inside the three-way pipe 32 is connected to a hose 341. The hose 341 is connected to the air delivery pipe 24. The air delivery end 34 is connected to the output end of the air pump 6. The oil delivery end 33 is connected to the output end of the oil pump 7. Both the oil delivery end 33 and the gas delivery end 34 are equipped with solenoid valves; both the gas delivery end 34 and the oil delivery end 33 are connected to the corresponding equipment via hoses, and the diameter of the hose 341 is smaller than the inner wall diameter of the mandrel 31, thus enabling the delivery of airflow.

[0027] In this embodiment, a sliding base 35 is fixedly connected to one end of the guide base 41, a slide block 36 is slidably connected above the sliding base 35, an installation sleeve 37 is rotatably connected above the slide block 36, and the core rod 31 is sleeved in the installation sleeve 37 and connected to a nut 38. The slide block 36, the mounting sleeve 37, and the nut 38 fix one end of the mandrel 31, while the other end of the mandrel 31 is connected to the inner mold mechanism 2. When the steel pipe is placed in the inner mold mechanism 2 and the mandrel 31, it needs to be pulled up, which can be achieved through the slide block 36 and the mounting sleeve 37.

[0028] In this embodiment, a guide groove 47 is provided above the guide base 41, one end of the guide groove 47 is inclined toward the lubrication box 11, and the slider 51 is located inside the guide groove 47. The guide base 41 has a through groove at one end near the lubrication box 11. This groove connects to the interior of the guide groove 47, allowing the lubricating oil in the guide groove 47 to flow back into the lubrication box 11.

[0029] In this embodiment, guide wheels 52 and 53 are rotatably connected on both sides of the slider 51. The telescopic receiving block 54 is inserted above the slider 51. The telescopic receiving block 54 has a through hole 55. The inner wall of the through hole 55 is embedded with ball bearings 56. The diameter of the through hole 55 is larger than that of the core rod 31. Among them, guide wheel 1 52 and guide wheel 2 53 have a certain height difference, which cooperates with the interior of guide groove 47, so that the receiving mechanism 5 will always slide in the direction of the outer mold mechanism 1, thereby supporting the middle part of the core rod 31; the telescopic receiving block 54 can move up and down a certain range to adapt to the raised core rod 31.

[0030] In this embodiment, a limiting groove 43 evenly distributed is provided on one side of the side plate 42, an inclined support plate 44 is provided between the side plates 42, and a limiting slider 45 evenly distributed is fixedly connected to the outside of the inclined support plate 44. The side plate 42 and the guide base 41 form a guide channel, which can guide the lubricating oil remaining on it.

[0031] In this embodiment, the limiting slider 45 is slidably connected to the inside of the limiting groove 43, and the upper part of the side plate 42 is threadedly connected to the adjusting bolt 46, and the bottom of the adjusting bolt 46 is rotatably connected to the limiting slider 45. The inclined support plate 44 is inclined inward, and its height can be adjusted to accommodate different diameters of the drawn tube.

[0032] In this embodiment, a slidably connected clamping puller 8 is provided above the drive base 81, and an oil pump 14 is provided on the outside of the lubrication box 11. The output end of the oil pump 14 is connected to a bellows 15. The drive base 81 contains a drive motor that can drive the chain to rotate, thereby driving the clamping and pulling carriage 8 to slide left and right. The clamping and pulling carriage 8 can clamp and fix one end of the steel pipe after it has been headed, and pull it out with the help of the drive base 81. The output end of the oil pump 14 is connected to the bellows 15, and the input end is connected to the bottom of the lubrication box 11. The lubricating oil in the lubrication box 11 is pumped into the bellows 15 to lubricate the outer wall of the steel pipe.

[0033] The working principle of this invention is as follows: After one end of the stainless steel pipe is headed, it will be conveyed to the top of the loading rack 9. At this time, the operator can attach the other end of the steel pipe to the outer periphery of the inner mold mechanism 2 and the mandrel 31. Then, the headed end of the steel pipe is inserted into the interior of the outer mold 13. Then, the external control device causes the drive base 81 to operate, thereby causing the clamping and pulling carriage 8 to move to the other side of the outer mold 13 and clamp the headed end of the steel pipe. Then, the clamping and pulling carriage 8 moves in the opposite direction to perform cold drawing. During this process, the air pump 6 and the oil pump 7 will operate synchronously when the clamping and pulling carriage 8 clamps one end of the steel pipe. The operation of the air pump 6 will continuously inject airflow into the air delivery end 34 and into the air delivery pipe 24 through the hose 341, so that the jet head 26 sprays airflow out of the inside of the steel pipe. The operation of the oil pump 7 will guide the drawing lubricating oil inside the lubrication box 11 into the oil delivery end 33 and through the inside of the mandrel 31 into the inside of the oil chamber 22, and finally discharge it from the oil outlet 231, thereby lubricating the inner wall of the steel pipe. Furthermore, since the oil outlet 231 and the jet nozzle 26 are facing each other, and the air supply pipe 24 extends to the inside of the steel pipe's head end, the spherical section 25 is already located on the other side of the outer mold 13 when the steel pipe is manually inserted at the beginning. Therefore, during the drawing process, the oil outlet 231 injects an appropriate amount of lubricating oil towards the jet nozzle 26, and the jet nozzle 26 gently guides this portion of lubricating oil towards the oil outlet 231, thereby limiting the lubricating oil to the transition area of ​​the steel pipe being drawn inside, thereby improving lubrication efficiency. In addition, the lubricating oil on the inner wall of the steel pipe will be blocked by the airflow sprayed from the jet nozzle 26, so that when the drawing is completed, no lubricating oil will remain inside the steel pipe. When the steel pipe is sleeved around the mandrel 31, it will push the telescopic receiving block 54 to move. During the pulling process, since the guide groove 47 is inclined and the guide wheel 1 52 and the guide wheel 2 53 are at different heights, it will move synchronously with one end of the steel pipe, so that the through hole 55 and the ball bearing 56 will always support the mandrel 31, thereby preventing the mandrel 31 from bending. In addition, when lubricating oil is conveyed into the steel pipe through the inner mold 21, some lubricating oil will flow out from the non-drawing end and then flow to the top of the guide base 41. In conjunction with the guide base 41 and the guide groove 47, this part of the lubricating oil will be guided back into the lubrication box 11.

[0034] The oil pump 14, air pump 6, oil pump 7 and drive base 81 used in this invention are all existing known electrical devices, and can all be purchased and used directly on the market. Their structure, circuit and control principle are all existing known technologies. Therefore, the structure, circuit and control principle of the oil pump 14, air pump 6, oil pump 7 and drive base 81 will not be described in detail here.

[0035] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art and are also general components, which are common knowledge in this field.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drawing fixture for producing small-diameter stainless steel pipes, comprising an outer mold mechanism (1), characterized in that: The outer mold mechanism (1) is provided with a guide mechanism (4) and a drive base (81) at both ends respectively. A mandrel mechanism (3) and a receiving mechanism (5) are provided above the guide mechanism (4). An inner mold mechanism (2) is provided at one end of the mandrel mechanism (3). An air pump (6) and an oil pump (7) are provided below the mandrel mechanism (3). A loading rack (9) is provided on one side of the drive base (81). The outer mold mechanism (1) includes a lubrication box (11) and an outer mold (13) mounted on the lubrication box (11) via a bracket (12); The inner mold mechanism (2) includes an inner mold (21) and an air supply pipe (24), with the air supply pipe (24) inserted into the interior of the inner mold (21); The mandrel mechanism (3) includes a mandrel (31) and a three-way tube (32) at the end of the mandrel (31) away from the inner mold mechanism (2). The guiding mechanism (4) includes a guide base (41) and side plates (42) fixedly connected to both sides above the guide base (41). The receiving mechanism (5) includes telescopic receiving blocks (54) and sliders (51) distributed vertically.

2. The drawing fixture for producing small-diameter stainless steel pipes according to claim 1, characterized in that: One end of the inner mold (21) is threaded to the periphery of one end of the mandrel (31) via a connecting pipe (211). The inner mold (21) is provided with an oil chamber (22) through which the gas supply pipe (24) passes. A ring-shaped pipe (23) is provided on one side of the oil chamber (22). An oil outlet (231) is provided on the end face of the pipe (23) at the end of the inner mold (21).

3. The drawing fixture for producing small-diameter stainless steel pipes according to claim 1, characterized in that: One end of the gas pipe (24) is provided with a spherical section (25), and the side edge of the spherical section (25) is provided with annularly distributed jet nozzles (26).

4. The drawing fixture for producing small-diameter stainless steel pipes according to claim 1, characterized in that: One end of the three-way pipe (32) is equipped with an oil delivery end (33), and the other end of the three-way pipe (32) is threaded to the periphery of the mandrel (31). The upper end of the three-way pipe (32) is equipped with an air delivery end (34). One end of the air delivery end (34) located inside the three-way pipe (32) is connected to a hose (341). The hose (341) is connected to the air delivery pipe (24). The air delivery end (34) is connected to the output end of the air pump (6). The oil delivery end (33) is connected to the output end of the oil pump (7).

5. The drawing fixture for producing small-diameter stainless steel pipes according to claim 1, characterized in that: One end of the guide base (41) is fixedly connected to a sliding base (35), a slide block (36) is slidably connected above the sliding base (35), an installation sleeve (37) is rotatably connected above the slide block (36), and the mandrel (31) is sleeved in the installation sleeve (37) and connected to a nut (38).

6. The drawing fixture for producing small-diameter stainless steel pipes according to claim 1, characterized in that: A guide groove (47) is provided above the guide base (41), one end of the guide groove (47) is inclined toward the lubrication box (11), and the slider (51) is located inside the guide groove (47).

7. The drawing fixture for producing small-diameter stainless steel pipes according to claim 1, characterized in that: The slider (51) is rotatably connected to guide wheel one (52) and guide wheel two (53) on both sides. The telescopic receiving block (54) is inserted above the slider (51). The telescopic receiving block (54) has a through hole (55). The inner wall of the through hole (55) is embedded with ball bearings (56). The diameter of the through hole (55) is larger than that of the mandrel (31).

8. The drawing fixture for producing small-diameter stainless steel pipes according to claim 1, characterized in that: One side of the side plate (42) is provided with a uniformly arranged limiting groove (43), and an inclined support plate (44) is provided between the side plates (42). A uniformly arranged limiting slider (45) is fixedly connected to the outside of the inclined support plate (44).

9. A drawing fixture for producing small-diameter stainless steel pipes according to claim 8, characterized in that: The limiting slider (45) is slidably connected to the inside of the limiting groove (43) and the upper part of the side plate (42) is threaded with an adjusting bolt (46). The bottom of the adjusting bolt (46) is rotatably connected to the limiting slider (45).

10. A drawing fixture for producing small-diameter stainless steel pipes according to claim 1, characterized in that: A slidably connected clamp pulling car (8) is provided above the drive base (81), and an oil pump (14) is provided on the outside of the lubrication box (11). The output end of the oil pump (14) is connected to a bellows (15).

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