Aluminum alloy plate rolling device

Abstract

The invention relates to the technical field of metal rolling, in particular to an aluminum alloy plate rolling device which comprises a rack and two rollers arranged in parallel, the two rollers are rotatably installed on the rack, two oil spraying pipes are installed on one side of the rack, and a roller way conveying structure is fixedly connected to the other side of the rack. Reciprocating linear structures are installed on the upper side and the lower side of the machine frame respectively and used for being connected with a supporting plate, a supporting beam is fixedly connected to the outer wall of the supporting plate, installation plates are vertically and fixedly connected to the two ends of the supporting beam, a baffle is fixedly connected between the two installation plates, a nozzle is rotationally installed on one face of the baffle, and a turbulence mixer is fixedly connected to the other face of the baffle. When an aluminum alloy plate is rolled, lubricating is conducted through the oil spraying pipe through the working process, cooling is conducted through liquid cooling plate refrigerant and vacuum pump suction, and cleaning is conducted through the nozzle and the rotating pipe; and the surface quality in the aluminum alloy plate rolling process and efficient operation of equipment are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of metal rolling, and in particular to an aluminum alloy plate rolling device. Background Art

[0002] During the rolling process with a large reduction rate, adhesive wear and abrasive wear occur due to insufficient lubrication, which further aggravates the metal roughening, causing the surface to lose gloss and form white spot-like wear defects on the surface on a macro scale.

[0003] In order to prevent white spot-like wear defects from occurring during the rolling process of aluminum alloy plates, it is necessary to spray lubricating oil on the rollers for process lubrication during production, so that there is an extremely thin and uniform oil film between the rollers and the rolled piece in the rolling deformation zone of the aluminum alloy plate, reducing the rolling pressure and making the rolled piece obtain a bright and flat surface after rolling. However, during the rolling process, moisture and other impurities (such as dust, oxides, etc.) may enter the rolling system and combine with the lubricating oil and metal particles on the rollers to form sludge on the roller surface. The sludge may adhere to the surface of the rolled piece, causing stains, scratches or oxidation on the product surface, affecting the appearance and performance of the product. Summary of the invention

[0004] The purpose of the present invention is to solve the defect in the prior art that the oil sludge on the surface of the roller affects the quality of the rolled product, and to propose an aluminum alloy plate rolling device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An aluminum alloy plate rolling device is designed, comprising a frame and two parallel rollers, the two rollers are rotatably mounted on the frame, two oil injection pipes are mounted on one side of the frame, and a roller conveying structure is fixedly connected to the other side, reciprocating linear structures are respectively mounted on the upper and lower sides of the frame to connect a support plate, a support beam is fixedly connected to the outer wall of the support plate, mounting plates are vertically fixedly connected to both ends of the support beam, a baffle is fixedly connected between the two mounting plates, a nozzle is rotatably mounted on one side of the baffle, and a turbulent mixer is fixedly connected to the other side, one end of the turbulent mixer is connected to the nozzle, and the other end is connected to the diverter pipe.

[0006] Preferably, the roller conveying structure includes a crossbeam and a plurality of conveying rollers, the crossbeam is horizontally fixed to the outside of the frame, and the conveying rollers are rotatably connected to the crossbeam to convey the rolled aluminum alloy plates.

[0007] Preferably, a liquid cooling plate is fixedly connected to the bottom of the cross beam, and a water outlet of the liquid cooling plate is connected to the diversion pipe through a hose.

[0008] Preferably, a vacuum pump is fixedly connected to the end of the support beam, a connecting pipe is installed at the air outlet of the vacuum pump, and the end of the connecting pipe is connected to the outer wall of the turbulent mixer and communicated with the turbulent mixer.

[0009] Preferably, arc-shaped rotating grooves are fixedly connected on both sides of the baffle, a rotating tube is rotatably installed in the rotating groove, a plurality of openings are radially opened on the rotating tube, a friction wheel is fixedly connected to the end face of the rotating tube, and the friction wheel abuts against the outer wall of the roller.

[0010] Preferably, a sludge collecting box is fixedly connected to the top of the mounting plate, the rotating tube is connected to the sludge collecting box through a first connecting pipe, the sludge collecting box is connected to the air inlet of the vacuum pump through a second connecting pipe, and a filter is provided on the second connecting pipe.

[0011] Preferably, the reciprocating linear structure includes a first reciprocating screw and a nut seat, the first reciprocating screw is rotatably mounted on the frame, the nut seat is fixedly connected to the support plate, the nut seat is threadedly engaged with the first reciprocating screw, a driven pulley is fixedly connected to the end of the first reciprocating screw, an electric spindle is rotatably mounted on the frame, a driving pulley is fixedly connected to the outer wall of the electric spindle, and a belt is installed between the driving pulley and the driven pulley.

[0012] Preferably, a second reciprocating screw is rotatably mounted on the mounting plate, one end of the second reciprocating screw is fixedly connected to a driven sprocket, and the other end is threadedly engaged in an internal threaded tube, both ends of the rotating tube are fixedly connected to a driving sprocket, a chain is engaged with the driving sprocket and the driven sprocket, a connecting plate is fixedly connected to the end of the internal threaded tube, a slot is formed on the connecting plate, a guide column is fixedly connected to the outer wall of the nozzle, and the guide column is slidably engaged in the slot.

[0013] The invention proposes an aluminum alloy plate rolling device, which has the beneficial effect that when rolling the aluminum alloy plate, the aluminum alloy plate is lubricated through the oil injection pipe, cooled by the liquid cooling plate refrigerant and vacuum pump suction, and cleaned by the nozzle and the rotating pipe through the working process, thereby ensuring the surface quality of the aluminum alloy plate during the rolling process and the efficient operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of an aluminum alloy plate rolling device proposed in the present invention.

[0015] Figure 2 This is a front view of an aluminum alloy plate rolling device proposed by the present invention.

[0016] Figure 3 This is a schematic structural diagram of the connection between a base and a frame of an aluminum alloy plate rolling device proposed by the present invention.

[0017] Figure 4 This is a structural schematic diagram of a roller conveying structure of an aluminum alloy plate rolling device proposed by the present invention.

[0018] Figure 5Schematic diagram of the installation structure of the support plate of the aluminum alloy plate rolling device proposed by the present invention Figure 1 .

[0019] Figure 6 Schematic diagram of the installation structure of the support plate of the aluminum alloy plate rolling device proposed by the present invention Figure 2 .

[0020] Figure 7 This is a schematic structural diagram of two mounting plates of an aluminum alloy plate rolling device proposed in the present invention.

[0021] Figure 8 This is a schematic structural diagram of two sludge collection boxes of an aluminum alloy plate rolling device proposed by the present invention.

[0022] Fig. 9 This is a schematic diagram of the structure above the baffle of an aluminum alloy plate rolling device proposed by the present invention.

[0023] Fig.10 This is a schematic diagram of the structure below the baffle of an aluminum alloy plate rolling device proposed by the present invention.

[0024] Fig.11 This is a schematic structural diagram of the connection between a turbulent mixer and a nozzle of an aluminum alloy plate rolling device proposed by the present invention.

[0025] Fig.12 The present invention proposes an aluminum alloy plate rolling device Fig.11 Enlarged view of point A in the middle.

[0026] In the figure: 1, base; 2, frame; 201, electric spindle; 202, driving pulley; 203, driven pulley; 204, belt; 3, oil injection pipe; 4, roller; 5, crossbeam; 6, conveyor roller; 7, liquid cooling plate; 701, water inlet; 702, water outlet; 8, hose; 9, first reciprocating screw; 10, nut seat; 11, support plate; 12, support beam; 13, mounting plate; 14, sludge collection box; 1 5. Vacuum pump; 16. Filter; 17. Second connecting pipe; 18. First connecting pipe; 19. Baffle; 20. Connecting pipe; 21. Diverter pipe; 22. Rotating groove; 23. Rotating pipe; 24. Driving sprocket; 25. Chain; 26. Driven sprocket; 27. Second reciprocating screw; 28. Internally threaded pipe; 29. ​​Connecting plate; 30. Friction wheel; 31. Notch; 32. Nozzle; 33. Turbulent mixer; 34. Guide column. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Reference Figure 1-Figure 4 A rolling device for aluminum alloy plates includes a frame 2 and two parallel rollers 4. A base 1 is fixed to the bottom of the frame 2 as a support for the entire device. The two rollers 4 are rotatably installed on the frame 2. Two oil injection pipes 3 are installed on one side of the frame 2 and a roller conveying structure is fixed on the other side.

[0029] During operation, the billet enters between the two rollers 4 from the side where the oil spray pipe 3 is located for rolling, and the oil spray pipe 3 sprays lubricating oil onto the two rollers 4 to reduce the friction between the billet and the rollers 4 during rolling, so as to prevent scratches on the surface of the finished aluminum alloy plate. After the billet is rolled into an aluminum alloy plate, it is transported by a roller conveyor structure for unloading.

[0030] like Figure 4 As shown, the roller conveying structure includes a crossbeam 5 and a plurality of conveying rollers 6. The crossbeam 5 is horizontally fixed to the outside of the frame 2. The conveying rollers 6 are rotatably connected to the crossbeam 5 to convey the rolled aluminum alloy plates. A liquid cooling plate 7 is fixed to the bottom of the crossbeam 5. The water outlet 702 of the liquid cooling plate 7 is connected to the diversion pipe 21 through a hose 8.

[0031] When the roller conveyor structure conveys the finished aluminum alloy plate, the conveyor roller 6 rotates to transport the aluminum alloy plate. The aluminum alloy plate itself has a relatively high temperature after rolling. During transportation, the heat of the aluminum alloy plate is transferred to the liquid cooling plate 7 through the conveyor roller 6. The refrigerant in the liquid cooling plate 7 absorbs the heat and heats up.

[0032] The refrigerant is pumped from the water inlet 701 of the liquid cooling plate 7 to the inside of the liquid cooling plate 7 . After absorbing heat and heating up, the refrigerant is discharged from the water outlet 702 of the liquid cooling plate 7 . After being discharged from the water outlet 702 , the refrigerant enters the diversion pipe 21 through the hose 8 .

[0033] like Figure 1-Figure 3 As shown, reciprocating linear structures are respectively installed on the upper and lower sides of the frame 2 to connect the support plate 11, and the reciprocating linear structure includes a first reciprocating screw 9 and a nut seat 10. The first reciprocating screw 9 is rotatably installed on the frame 2, and the nut seat 10 is fixedly connected to the support plate 11. The nut seat 10 is threadedly engaged with the first reciprocating screw 9, and a driven pulley 203 is fixedly connected to the end of the first reciprocating screw 9. An electric spindle 201 is rotatably installed on the frame 2, and a driving pulley 202 is fixedly connected to the outer wall of the electric spindle 201, and a belt 204 is installed between the driving pulley 202 and the driven pulley 203.

[0034] When the electric spindle 201 is energized, it will drive the active pulley 202 to rotate. During the rotation of the active pulley 202, all the driven pulleys 203 are driven to rotate synchronously through the belt 204. The rotation of the driven pulley 203 drives the first reciprocating screw 9 to rotate. Since the nut seat 10 cooperates with the first reciprocating screw 9 and the nut seat 10 cannot rotate, during the rotation of the first reciprocating screw 9, the nut seat 10 will be driven to make a linear reciprocating motion along the axial direction of the roller 4, so as to drive the support plate 11 to make an axial scanning motion above the roller 4.

[0035] like Figure 5-Figure 12 As shown, a support beam 12 is fixedly connected to the outer wall of the support plate 11, and mounting plates 13 are vertically fixedly connected to both ends of the support beam 12. A baffle 19 is fixedly connected between the two mounting plates 13. A nozzle 32 is rotatably mounted on one side of the baffle 19, and a turbulent mixer 33 is fixedly connected to the other side. One end of the turbulent mixer 33 is connected to the nozzle 32, and the other end is connected to the diversion pipe 21.

[0036] The heated refrigerant is input into the turbulent mixer 33 from the diversion pipe 21. After the refrigerant is mixed with the high-pressure air in the turbulent mixer 33, a high-temperature gas containing a large amount of water mist is sprayed out from the nozzle 32. As the nozzle 32 performs a scanning motion along the axial direction of the roller 4 driven by the support plate 11, the high-temperature gas sprayed from the nozzle 32 will clean the surface of the roller 4, so that the sludge generated on the surface of the roller 4 is heated and melted by the high-temperature gas and cleaned, the purpose is to melt the sludge and make the melted sludge gather to both sides of the roller 4.

[0037] like Figure 5-Figure 8 As shown, a vacuum pump 15 is fixedly connected to the end of the support beam 12, and a connecting pipe 20 is installed at the air outlet of the vacuum pump 15. The end of the connecting pipe 20 is connected to the outer wall of the turbulent mixer 33 and communicated with the turbulent mixer 33. Arc-shaped rotating grooves 22 are fixedly connected to both sides of the baffle 19. A rotating tube 23 is rotatably installed in the rotating groove 22. A plurality of openings are radially opened on the rotating tube 23. A friction wheel 30 is fixedly connected to the end face of the rotating tube 23. The friction wheel 30 abuts against the outer wall of the roller 4. A sludge collecting box 14 is fixedly connected to the top of the mounting plate 13. The rotating tube 23 is communicated with the sludge collecting box 14 through a first connecting pipe 18. The sludge collecting box 14 is connected to the air inlet of the vacuum pump 15 through a second connecting pipe 17. A filter 16 is provided on the second connecting pipe 17 to filter the air entering the vacuum pump 15.

[0038] The roller 4 rotates when rolling the blank. Since the friction wheel 30 abuts against the roller 4 , the roller 4 rotates and drives the friction wheel 30 to rotate. The rotation of the friction wheel 30 drives the rotating tube 23 to rotate in the rotating groove 22 .

[0039] During the rotation of the rotating tube 23, the vacuum pump 15 is energized and continuously sucks the second connecting pipe 17. Under the action of negative pressure, the rotating tube 23 will generate a strong suction force on the surface of the roller 4 through the opening, so as to suck the melted sludge gathered on both sides of the roller 4 and the hot air on the surface of the roller 4 into the rotating tube 23. The sludge and hot air enter the rotating tube 23 and enter the sludge collecting box 14 through the first connecting pipe 18 under the action of negative pressure. The solid sludge is precipitated inside the sludge collecting box 14, and the heat enters the vacuum pump 15 along the second connecting pipe 17 in the form of hot air, and is discharged from the connecting pipe 20 on the air outlet of the vacuum pump 15. The connecting pipe 20 transports the hot air to the turbulent mixer 33 and mixes it with the refrigerant heated up inside the turbulent mixer 33.

[0040] like Figure 9-11 As shown, a second reciprocating screw 27 is rotatably mounted on the mounting plate 13, one end of the second reciprocating screw 27 is fixedly connected to a driven sprocket 26, and the other end is threadedly engaged in an internal threaded tube 28, both ends of the rotating tube 23 are fixedly connected to a driving sprocket 24, a chain 25 is engaged on the driving sprocket 24 and the driven sprocket 26, a connecting plate 29 is fixedly connected to the end of the internal threaded tube 28, the connecting plate 29 is provided with a slot 31, a guide column 34 is fixedly connected to the outer wall of the nozzle 32, and the guide column 34 is slidably engaged in the slot 31.

[0041] During the rotation of the rotating tube 23, the driving sprocket 24 is driven to rotate, and the rotation of the driving sprocket 24 drives the driven sprocket 26 to rotate through the chain 25. The rotation of the driven sprocket 26 drives the second reciprocating screw 27 to rotate. The rotation of the second reciprocating screw 27 drives the internal threaded tube 28 to make reciprocating linear motion along the axial direction. The internal threaded tube 28 drives the connecting plate 29 to make reciprocating linear motion. The connecting plates 29 located on both sides of the nozzle 32 move in opposite directions. Therefore, during the reciprocating linear motion of the connecting plate 29, the nozzle 32 is driven to deflect back and forth through the guide column 34, so that the airflow ejected from the nozzle 32 is deflected back and forth, so as to improve the cleaning quality of the sludge on the surface of the roller 4.

[0042] Working principle: During operation, the billet enters between the two rollers 4 from the side where the oil spray pipe 3 is located for rolling, and the oil spray pipe 3 sprays lubricating oil onto the two rollers 4 to reduce the friction between the billet and the rollers 4 during rolling, so as to prevent scratches on the surface of the finished aluminum alloy plate. After the billet is rolled into an aluminum alloy plate, it is transported by a roller conveyor structure for unloading.

[0043] like Figure 4 As shown, the roller conveying structure includes a crossbeam 5 and a plurality of conveying rollers 6. The crossbeam 5 is horizontally fixed to the outside of the frame 2. The conveying rollers 6 are rotatably connected to the crossbeam 5 to convey the rolled aluminum alloy plates. A liquid cooling plate 7 is fixed to the bottom of the crossbeam 5. The water outlet 702 of the liquid cooling plate 7 is connected to the diversion pipe 21 through a hose 8.

[0044] When the roller conveyor structure conveys the finished aluminum alloy plate, the conveyor roller 6 rotates to transport the aluminum alloy plate. The aluminum alloy plate itself has a relatively high temperature after rolling. During transportation, the heat of the aluminum alloy plate is transferred to the liquid cooling plate 7 through the conveyor roller 6. The refrigerant in the liquid cooling plate 7 absorbs the heat and heats up.

[0045] The refrigerant is pumped from the water inlet 701 of the liquid cooling plate 7 to the inside of the liquid cooling plate 7 . After absorbing heat and heating up, the refrigerant is discharged from the water outlet 702 of the liquid cooling plate 7 . After being discharged from the water outlet 702 , the refrigerant enters the diversion pipe 21 through the hose 8 , and the heated refrigerant is transported to the turbulent mixer 33 through the diversion pipe 21 .

[0046] The roller 4 rotates when rolling the blank. Since the friction wheel 30 abuts against the roller 4 , the roller 4 rotates and drives the friction wheel 30 to rotate. The rotation of the friction wheel 30 drives the rotating tube 23 to rotate in the rotating groove 22 .

[0047] During the rotation of the rotating tube 23, the vacuum pump 15 is energized and continuously sucks the second connecting pipe 17. Under the action of negative pressure, the rotating tube 23 will generate a strong suction force on the surface of the roller 4 through the opening, so as to suck the melted sludge gathered on both sides of the roller 4 and the hot air on the surface of the roller 4 into the rotating tube 23. The sludge and hot air enter the rotating tube 23 and enter the sludge collecting box 14 through the first connecting pipe 18 under the action of negative pressure. The solid sludge is precipitated inside the sludge collecting box 14, and the heat enters the vacuum pump 15 along the second connecting pipe 17 in the form of hot air, and is discharged from the connecting pipe 20 on the air outlet of the vacuum pump 15. The connecting pipe 20 transports the hot air to the turbulent mixer 33.

[0048] After the heated refrigerant and hot air enter the turbulent mixer 33, the refrigerant and hot air are mixed in the turbulent mixer 33 and high-temperature gas containing a large amount of water mist is sprayed out from the nozzle 32. Since the nozzle 32 performs a scanning motion along the axial direction of the roller 4 driven by the support plate 11, the high-temperature gas sprayed from the nozzle 32 will clean the surface of the roller 4, so that the sludge generated on the surface of the roller 4 can be heated and melted by the high-temperature gas and cleaned. The purpose is to melt the sludge and make the melted sludge gather to both sides of the roller 4 so that the rotating tube 23 can suck it out.

[0049] During the rotation of the rotating tube 23, the driving sprocket 24 is driven to rotate, and the rotation of the driving sprocket 24 drives the driven sprocket 26 to rotate through the chain 25. The rotation of the driven sprocket 26 drives the second reciprocating screw 27 to rotate. The rotation of the second reciprocating screw 27 drives the internal threaded tube 28 to make reciprocating linear motion along the axial direction. The internal threaded tube 28 drives the connecting plate 29 to make reciprocating linear motion. The connecting plates 29 located on both sides of the nozzle 32 move in opposite directions. Therefore, during the reciprocating linear motion of the connecting plate 29, the nozzle 32 is driven to deflect back and forth through the guide column 34, so that the airflow ejected from the nozzle 32 is deflected back and forth, so as to improve the cleaning quality of the sludge on the surface of the roller 4.

[0050] Compared with the prior art, the present invention, during rolling of aluminum alloy plates, lubricates through the oil injection pipe 3, cools through the refrigerant of the liquid cooling plate 7 and the vacuum pump 15, and cleans through the nozzle 32 and the rotating tube 23, thereby ensuring the surface quality of the aluminum alloy plates during rolling and the efficient operation of the equipment.

[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An aluminum alloy plate rolling device, comprising a frame (2) and two parallel rollers (4), wherein the two rollers (4) are rotatably mounted on the frame (2), characterized in that: Two oil injection pipes (3) are installed on one side of the frame (2), and a roller conveying structure is fixedly connected to the other side. Reciprocating linear structures are respectively installed on the upper and lower sides of the frame (2) for connecting a support plate (11). A support beam (12) is fixedly connected to the outer wall of the support plate (11). Both ends of the support beam (12) are vertically fixedly connected to mounting plates (13). A baffle (19) is fixedly connected between the two mounting plates (13). A nozzle (32) is rotatably installed on one side of the baffle (19), and a turbulent mixer (33) is fixedly connected to the other side. One end of the turbulent mixer (33) is connected to the nozzle (32), and the other end is connected to the diverter pipe (21).

2. The aluminum alloy plate rolling device according to claim 1, characterized in that: The roller conveying structure comprises a crossbeam (5) and a plurality of conveying rollers (6); the crossbeam (5) is horizontally fixed to the outside of the frame (2); and the conveying rollers (6) are rotatably connected to the crossbeam (5) to convey the rolled aluminum alloy plates.

3. The aluminum alloy plate rolling device according to claim 2, characterized in that: A liquid cooling plate (7) is fixedly connected to the bottom of the crossbeam (5), and a water outlet (702) of the liquid cooling plate (7) is connected to the diversion pipe (21) via a hose (8).

4. The aluminum alloy plate rolling device according to claim 3, characterized in that: A vacuum pump (15) is fixedly connected to the end of the support beam (12), a connecting pipe (20) is installed at the air outlet of the vacuum pump (15), and the end of the connecting pipe (20) is connected to the outer wall of the turbulent mixer (33) and communicates with the turbulent mixer (33).

5. The aluminum alloy plate rolling device according to claim 4, characterized in that: Arc-shaped rotating grooves (22) are fixedly connected to both sides of the baffle (19), a rotating tube (23) is rotatably mounted in the rotating groove (22), a plurality of openings are radially opened on the rotating tube (23), a friction wheel (30) is fixedly connected to the end surface of the rotating tube (23), and the friction wheel (30) abuts against the outer wall of the roller (4).

6. The aluminum alloy plate rolling device according to claim 5, characterized in that: An oil sludge collection box (14) is fixedly connected to the top of the mounting plate (13); the rotating tube (23) is connected to the oil sludge collection box (14) via a first connecting tube (18); the oil sludge collection box (14) is connected to an air inlet of a vacuum pump (15) via a second connecting tube (17); and a filter (16) is provided on the second connecting tube (17).

7. The aluminum alloy plate rolling device according to claim 6, characterized in that: The reciprocating linear structure comprises a first reciprocating screw (9) and a nut seat (10); the first reciprocating screw (9) is rotatably mounted on a frame (2); the nut seat (10) is fixedly connected to a support plate (11); the nut seat (10) is threadedly engaged with the first reciprocating screw (9); a driven pulley (203) is fixedly connected to the end of the first reciprocating screw (9); an electric spindle (201) is rotatably mounted on the frame (2); a driving pulley (202) is fixedly connected to the outer wall of the electric spindle (201); and a belt (204) is mounted between the driving pulley (202) and the driven pulley (203).

8. The aluminum alloy plate rolling device according to claim 7, characterized in that: A second reciprocating screw (27) is rotatably mounted on the mounting plate (13); one end of the second reciprocating screw (27) is fixedly connected to a driven sprocket (26) and the other end is threadedly engaged in an internally threaded tube (28); both ends of the rotating tube (23) are fixedly connected to driving sprockets (24); a chain (25) is engaged on the driving sprocket (24) and the driven sprocket (26); a connecting plate (29) is fixedly connected to the end of the internally threaded tube (28); a notch (31) is formed on the connecting plate (29); a guide column (34) is fixedly connected to the outer wall of the nozzle (32); the guide column (34) is slidably engaged in the notch (31).

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