A cleaning device for metal casting processing

Abstract

The present invention belongs to the field of cleaning technology, in particular to a cleaning device for metal casting processing. The following scheme is now proposed, including a bracket and a cleaning tank. The bracket and the cleaning tank are connected by bolts. A drain port is provided on one side of the cleaning tank, and a sealing plate is connected to the inner wall of the drain port by bolts. A support mechanism is arranged between the opposite sides of the cleaning tank, and the shape of the support mechanism is U-shaped. An adjusting mechanism is arranged on the outer wall of one side of the cleaning tank, and a support plate is arranged on one side of the adjusting mechanism. The bottom of the support plate is connected to a fixed shaft by bolts, and the bottom of the fixed shaft is connected to a fixing plate by bolts. The present invention is convenient for improving the cleaning effect of the cleaning roller on the metal casting, preventing the cleaning mechanism from being unable to effectively clean the metal casting due to the same rotation direction between the metal casting and the cleaning mechanism, thereby resulting in a poor cleaning effect of the metal casting.

Description

Technical Field

[0001] The present invention relates to the field of cleaning, and particularly to a cleaning device for metal casting processing. Background Art

[0002] A cleaning machine is a device that uses brushes to clean dirt from workpieces. When processing metal castings, a cleaning device is usually used to clean the surface of small-sized metal castings.

[0003] After retrieval, a Chinese patent application with the publication number CN217528460U discloses a cleaning device for metal casting processing, including a bottom plate. On the upper surfaces of both sides of the bottom plate, support frames are fixedly installed, and buckles are arranged on the outer surfaces of the upper ends of the support frames. An inner plate is arranged on the upper side inside the support frames, and the support frames and the inner plate are connected to each other through the buckles. A top cover is arranged on the inner surface of the upper end of the inner plate, and a motor is installed on the upper surface of the middle part of the top cover. A placement rack is arranged on the upper side of the middle part of the bottom plate, and an inner column is installed on the inner side of the middle part of the placement rack. A baffle is arranged on the outer surface of the inner column. An installation head is installed on the inner end surface of the placement rack. An outer rod is fixedly installed on the outer surface of the middle part of the placement rack, and both ends of the outer rod are located inside the clamping plates. A recovery plate is arranged on the upper side surface of the middle part of the bottom plate, and the bottom plate and the recovery plate are connected to each other through a pull rope. This cleaning device for metal casting processing can facilitate the operator to take the processed raw materials.

[0004] When the existing equipment is used to clean the processed metal castings, the rotation of the brushes is usually used to brush the metal castings. However, when cleaning the metal castings, the metal castings are usually immersed in water, and the rotation of the brushes will drive the water flow to rotate, and the metal castings will move along with the rotation of the water flow. Therefore, the moving direction of the metal castings will be the same as the rotation direction of the brushes, resulting in poor cleaning effect of the metal castings. Summary of the Invention

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A cleaning device for metal casting processing includes a bracket and a cleaning pool. The bracket and the cleaning pool are connected by bolts. A drain port is opened on one side of the cleaning pool, and a sealing plate is connected to the inner wall of the drain port by bolts. A support mechanism is arranged between the opposite sides of the cleaning pool, and the shape of the support mechanism is U-shaped. An adjusting mechanism is arranged on the outer wall of one side of the cleaning pool, and a support plate is arranged on one side of the adjusting mechanism. The bottom of the support plate is connected to a fixed shaft by bolts, and the bottom of the fixed shaft is connected to a fixing plate by bolts. A cleaning mechanism is arranged at the bottom of the fixing plate, and the rotation direction of the cleaning mechanism is opposite to the rotation direction of the support mechanism.

[0007] Preferably, a position of the inner wall of the cleaning tank near the bottom is connected to a limiting frame by bolts, and a filter plate is connected to the top of the limiting frame by bolts.

[0008] Preferably, the supporting mechanism consists of four rotating rods, four supporting rollers, a conveyor belt and a first motor, and the two ends of the four rotating rods are rotatably connected to the inner walls of the cleaning tank on both sides opposite to each other through bearings, the four supporting rollers are fixedly sleeved on the outer walls of the rotating rods, the conveyor belt is rotatably connected to the four supporting rollers, and the four supporting rollers are distributed in a U-shape, a pressure roller is connected between the inner walls of the cleaning tank on both sides opposite to each other through bolts, the bottom of the pressure roller is in contact with the top of the conveyor belt, one side of the first motor is connected to one side of the cleaning tank through bolts, and one end of the first motor is fixedly connected to one end of one of the rotating rods.

[0009] Preferably, connecting rollers are connected between the inner walls of the cleaning tank on both sides by bolts, and a scraper is connected to one side of the connecting roller by bolts, one end of the scraper is in contact with the conveyor belt, and the connecting rollers are symmetrically distributed on both sides of the conveyor belt.

[0010] Preferably, the adjustment mechanism includes an adjustment seat, a threaded rod, an adjustment block and a second motor, and one side of the adjustment seat is connected to one side of the cleaning tank by bolts, an adjustment port is penetrated through one side of the adjustment seat near the top, and a rotational connection is formed between the opposite sides of the adjustment port and the two ends of the threaded rod through bearings, the adjustment block is slidably connected to the adjustment port, a threaded port is penetrated through the top of the adjustment block, the threaded port is threadedly connected to the threaded rod, the second motor is fixedly connected to the top of the adjustment seat, and one end of the second motor is connected to the top of the threaded rod by bolts.

[0011] Preferably, positioning holes are provided on two opposite sides of the adjustment opening, and positioning blocks are slidably connected to the inner walls of the two positioning holes, and one side of the positioning block is connected to the adjustment block by bolts.

[0012] Preferably, the cleaning mechanism includes multiple side plates, two shafts, two cleaning rollers and multiple brush filaments, and the tops of the multiple side plates are connected to the bottom of the fixed plate by bolts, the two ends of the shaft are rotatably connected to the two side plates by bearings, one side of the top of the fixed plate is connected to a third motor by bolts, one end of the third motor and the outer wall of one of the shafts are fixed with a first pulley, the two first pulleys are rotatably connected with a first belt, a second pulley is fixed to one side of the outer walls of the two shafts, the two second pulleys are rotatably connected with a second belt, and multiple brush filaments are fixed on the outer wall of the cleaning roller at equal distances, and the brush filaments are made of elastic material.

[0013] Preferably, a swing mechanism is provided at the bottom of the fixed plate, and the swing mechanism is located between the two cleaning rollers, and the swing mechanism and the cleaning mechanism are matched with each other.

[0014] Preferably, the swing mechanism includes a connecting plate, a rotating shaft, two third pulleys, a third belt, a cam and a swing rod, and the top of the connecting plate is fixedly connected to the bottom of the fixed plate, one end of the rotating shaft and the connecting plate are rotatably connected via a bearing, one end of the rotating shaft and the cam are connected via bolts, one end of the swing rod is connected to one side of the cam near the top via bolts, a swing roller is rotatably sleeved on the outer wall of the swing rod, one of the third pulleys is fixedly sleeved on the outer wall of one of the shafts, the other third pulley is fixedly sleeved on the outer wall of the rotating shaft, and the two third pulleys are rotatably connected to the third belt.

[0015] The beneficial effects of the present invention are:

[0016] The present invention provides a supporting mechanism and a cleaning mechanism. When cleaning the metal casting, a cleaning liquid is injected into the cleaning tank and the cleaning liquid is immersed above the supporting mechanism. After the injection is completed, the processed metal casting is placed on the supporting mechanism. At this time, the adjusting mechanism is started, and the cleaning mechanism is driven to move downward by the adjusting mechanism, so that the cleaning mechanism contacts the metal casting. At this time, the first motor is started, and the first motor drives the supporting roller to rotate, so that the conveyor belt drives the metal casting to move. At the same time, the third motor is started, and the third motor drives the cleaning roller to rotate. The rotation direction of the cleaning roller is opposite to the rotation direction of the conveyor belt, so as to improve the cleaning effect of the cleaning roller on the metal casting, and prevent the cleaning mechanism from being unable to effectively clean the metal casting due to the same rotation direction between the metal casting and the cleaning mechanism, so that the cleaning effect of the metal casting is poor. During this period, the scraper can scrape off the stains adhering to the conveyor belt, so as to improve the cleaning effect of the metal casting. The cooperation between the supporting mechanism and the cleaning mechanism can effectively clean the metal casting, and improve the cleaning efficiency of the equipment on the metal casting.

[0017] The present invention provides a cleaning mechanism and a swinging mechanism. When the cleaning mechanism is used to clean the metal casting, the swinging mechanism is rotated through the cooperation between the third pulley and the third belt. At this time, the cam drives the swinging rod and the swinging roller to rotate, and the swinging roller squeezes the conveyor belt when rotating, so that the top of the conveyor belt is depressed downward, so that the metal castings distributed on both sides of the conveyor belt roll to the middle position of the conveyor belt, so that it is convenient to clean the metal castings by the cleaning roller, and prevent the metal castings from moving to one side of the conveyor belt under the action of the conveyor belt, so that the cleaning roller and the metal castings cannot contact each other, thereby affecting the cleaning of the metal castings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a cleaning device for metal casting processing proposed by the present invention;

[0019] Figure 2 A schematic cross-sectional view of a cleaning tank of a cleaning device for metal casting processing proposed by the present invention;

[0020] Figure 3 This is a schematic diagram of the support structure of a cleaning device for metal casting processing proposed by the present invention;

[0021] Figure 4 A schematic diagram of the structure of an adjustment mechanism and a cleaning mechanism of a cleaning device for metal casting processing proposed by the present invention;

[0022] Figure 5 A schematic diagram of the cleaning mechanism and swing mechanism of a cleaning device for metal casting processing proposed by the present invention;

[0023] Figure 6 A schematic diagram of the cleaning mechanism structure of a cleaning device for metal casting processing proposed by the present invention;

[0024] Figure 7 The present invention is a schematic diagram of the structure of a swing mechanism of a cleaning device for metal casting processing.

[0025] In the attached figure: 1, bracket; 2, cleaning tank; 3, sealing plate; 4, supporting mechanism; 5, adjusting mechanism; 6, supporting plate; 7, fixed shaft; 8, fixed plate; 9, cleaning mechanism; 10, limit frame; 11, filter plate; 12, rotating rod; 13, supporting roller; 14, conveyor belt; 15, first motor; 16, pressure roller; 17, connecting roller; 18, scraper; 19, adjusting seat; 20, adjusting port; 21, threaded rod; 22, positioning port ; 23. Adjustment block; 24. Second motor; 25. Positioning block; 26. Side plate; 27. Connecting plate; 28. Swinging mechanism; 29. ​​Third motor; 30. First belt; 31. First pulley; 32. Cleaning roller; 33. Brush; 34. Shaft; 35. Second belt; 36. Second pulley; 37. Third pulley; 38. Third belt; 39. Rotating shaft; 40. Cam; 41. Swinging rod; 42. Swinging roller. DETAILED DESCRIPTION

[0026] Example 1, reference Figure 1-6, A cleaning device for metal casting processing, including a bracket 1 and a cleaning pool 2. The bracket 1 and the cleaning pool 2 are connected by bolts. A drain port is provided on one side of the cleaning pool 2, and a sealing plate 3 is connected to the inner wall of the drain port by bolts. A support mechanism 4 is arranged between the opposite sides of the cleaning pool 2, and the shape of the support mechanism 4 is U-shaped. An adjusting mechanism 5 is arranged on the outer wall of one side of the cleaning pool 2, and a support plate 6 is arranged on one side of the adjusting mechanism 5. The bottom of the support plate 6 is connected to a fixed shaft 7 by bolts, and the bottom of the fixed shaft 7 is connected to a fixing plate 8 by bolts. A cleaning mechanism 9 is arranged at the bottom of the fixing plate 8. The rotation direction of the cleaning mechanism 9 is opposite to that of the support mechanism 4. Through the cooperation between the support mechanism 4 and the cleaning mechanism 9, the metal casting can be effectively cleaned, and the cleaning efficiency of the device for the metal casting can be improved.

[0027] On the basis of the above, a limiting frame 10 is connected to the inner wall of the cleaning pool 2 near the bottom by bolts, and a filter plate 11 is connected to the top of the limiting frame 10 by bolts.

[0028] On the basis of the above, the support mechanism 4 consists of four rotating rods 12, four support rollers 13, a conveyor belt 14 and a first motor 15. The two ends of the four rotating rods 12 are rotatably connected to the opposite inner walls of the cleaning pool 2 through bearings. The four support rollers 13 are fixedly sleeved on the outer walls of the rotating rods 12. The conveyor belt 14 is rotatably connected to the four support rollers 13. The four support rollers 13 are distributed in a U-shaped pattern. A pressure roller 16 is connected to the opposite inner walls of the cleaning pool 2 by bolts. The bottom of the pressure roller 16 contacts the top of the conveyor belt 14. One side of the first motor 15 is connected to one side of the cleaning pool 2 by bolts, and one end of the first motor 15 is fixedly connected to one end of one of the rotating rods 12. The rotation direction of the cleaning roller 32 is opposite to that of the conveyor belt 14, so as to facilitate improving the cleaning effect of the cleaning roller 32 on the metal casting and prevent the cleaning mechanism 9 from being unable to effectively clean the metal casting due to the same rotation direction between the metal casting and the cleaning mechanism 9, resulting in a poor cleaning effect of the metal casting.

[0029] On the basis of the above, a connecting roller 17 is connected to the opposite inner walls of the cleaning pool 2 by bolts, and a scraper 18 is connected to one side of the connecting roller 17 by bolts. One end of the scraper 18 contacts the conveyor belt 14. The connecting rollers 17 are symmetrically distributed on both sides of the conveyor belt 14. The stains adhering to the conveyor belt 14 can be scraped off by the scraper 18 to facilitate improving the cleaning effect of the metal casting.

[0030] On the basis of the above, the adjustment mechanism 5 includes an adjustment seat 19, a threaded rod 21, an adjustment block 23 and a second motor 24, and one side of the adjustment seat 19 is connected to one side of the cleaning tank 2 by bolts, and an adjustment port 20 is penetrated through one side of the adjustment seat 19 near the top, and the opposite sides of the adjustment port 20 are rotatedly connected with the two ends of the threaded rod 21 through bearings, the adjustment block 23 is slidably connected to the adjustment port 20, and a threaded port is penetrated through the top of the adjustment block 23, and the threaded port is threadedly connected to the threaded rod 21, the second motor 24 is fixedly connected to the top of the adjustment seat 19, and one end of the second motor 24 is connected to the top of the threaded rod 21 by bolts, so as to adjust the height position of the cleaning mechanism 9.

[0031] On the basis of the above, positioning holes 22 are opened on both opposite sides of the adjustment hole 20, and the inner walls of the two positioning holes 22 are slidably connected with positioning blocks 25, and one side of the positioning block 25 is connected to the adjustment block 23 by bolts.

[0032] On the basis of the above, the cleaning mechanism 9 includes multiple side plates 26, two shafts 34, two cleaning rollers 32 and multiple brush wires 33, and the tops of the multiple side plates 26 are connected to the bottom of the fixed plate 8 by bolts, and the two ends of the shaft 34 are rotatably connected to the two side plates 26 through bearings. One side of the top of the fixed plate 8 is connected to a third motor 29 by bolts, and one end of the third motor 29 and the outer wall of one of the shafts 34 are fixed with a first pulley 31, and a first belt 30 is rotatably connected between the two first pulleys 31, and a second pulley 36 is fixed to one side of the outer wall of the two shafts 34, and a second belt 35 is rotatably connected between the two second pulleys 36. Multiple brush wires 33 are fixed on the outer wall of the cleaning roller 32 at equal distances, and the brush wires 33 are made of elastic material.

[0033] Example 2, reference Figure 1-7 , a cleaning device for metal casting processing, compared with Example 1, on the basis of Example 1, a swing mechanism 28 is provided at the bottom of the fixed plate 8, and the swing mechanism 28 is located between two cleaning rollers 32, and the swing mechanism 28 and the cleaning mechanism 9 are matched.

[0034] On the basis of the above, the swing mechanism 28 includes a connecting plate 27, a rotating shaft 39, two third pulleys 37, a third belt 38, a cam 40 and a swing rod 41, and the top of the connecting plate 27 is fixedly connected to the bottom of the fixed plate 8, one end of the rotating shaft 39 is rotatably connected to the connecting plate 27 through a bearing, one end of the rotating shaft 39 is connected to the cam 40 by bolts, one end of the swing rod 41 is connected to one side of the cam 40 near the top by bolts, and the outer wall of the swing rod 41 is rotatably sleeved with a swing roller 42, one of the third pulleys 37 is fixedly sleeved on the outer wall of one of the shafts 34, the other third pulley 37 is fixedly sleeved on the outer wall of the rotating shaft 39, and the two third pulleys 37 and the third belt 38 are fixedly sleeved on the outer wall of the rotating shaft 39. 8 are rotatably connected. When the metal castings are cleaned by the cleaning mechanism 9, the swing mechanism 28 is rotated by the cooperation between the third pulley 37 and the third belt 38. At this time, the cam 40 drives the swing rod 41 and the swing roller 42 to rotate, and the swing roller 42 squeezes the conveyor belt 14 when rotating, so that the top of the conveyor belt 14 is concave downward, so that the metal castings distributed on both sides of the conveyor belt 14 roll to the middle position of the conveyor belt 14, so as to facilitate the cleaning of the metal castings by the cleaning roller 42, and prevent the metal castings from moving to one side of the conveyor belt 14 under the action of the conveyor belt 14, so that the cleaning roller 32 and the metal castings cannot contact, thereby affecting the cleaning of the metal castings.

[0035] In summary, with the aid of the above technical solution of the present invention: when cleaning the metal casting, the cleaning liquid is injected into the cleaning tank 2, and the cleaning liquid is immersed above the supporting mechanism 4. After the injection is completed, the processed metal casting is placed on the supporting mechanism 4. At this time, the adjusting mechanism 5 is started, and the cleaning mechanism 9 is driven to move downward by the adjusting mechanism 5, so that the cleaning mechanism 9 is in contact with the metal casting. At this time, the first motor 15 is started, and the first motor 15 will drive the supporting roller 13 to rotate, so that the conveyor belt 14 drives the metal casting to move. At the same time, the third motor 29 is started, and the third motor 39 will drive the cleaning roller 32 to rotate. The rotation direction of the cleaning roller 32 is opposite to that of the conveyor belt 14, so as to improve the cleaning effect of the cleaning roller 32 on the metal casting, and prevent the cleaning mechanism 9 from being unable to effectively clean the metal casting due to the same rotation direction between the metal casting and the cleaning mechanism 9, thereby making the cleaning effect of the metal casting poor. During this period, The scraper 18 can be used to scrape off the stains adhering to the conveyor belt 14, so as to improve the cleaning effect of the metal castings. The cooperation between the support mechanism 4 and the cleaning mechanism 9 can effectively clean the metal castings, and improve the cleaning efficiency of the equipment for the metal castings. When the metal castings are cleaned by the cleaning mechanism 9, the swing mechanism 28 is rotated by the cooperation between the third pulley 37 and the third belt 38. At this time, the cam 40 will drive the swing rod 41 and the swing roller 42 to rotate, and the swing roller 42 will squeeze the conveyor belt 14 when rotating, so that the top of the conveyor belt 14 is concave downward, so that the metal castings distributed on both sides of the conveyor belt 14 roll to the middle position of the conveyor belt 14, so as to facilitate the cleaning of the metal castings by the cleaning roller 42, and prevent the metal castings from moving to one side of the conveyor belt 14 under the action of the conveyor belt 14, so that the cleaning roller 32 and the metal castings cannot contact, thereby affecting the cleaning of the metal castings.

[0036] 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. A cleaning device for metal casting processing, comprising a bracket (1) and a cleaning tank (2), wherein the bracket (1) and the cleaning tank (2) are connected by bolts, a liquid discharge port is provided on one side of the cleaning tank (2), and a sealing plate (3) is connected to the inner wall of the liquid discharge port by bolts, wherein: A support mechanism (4) is arranged between the opposite sides of the cleaning tank (2), and the shape of the support mechanism (4) is U-shaped. An adjusting mechanism (5) is arranged on the outer wall of one side of the cleaning tank (2), and a support plate (6) is arranged on one side of the adjusting mechanism (5). The bottom of the support plate (6) is bolted with a fixed shaft (7), and the bottom of the fixed shaft (7) is bolted with a fixed plate (8). A cleaning mechanism (9) is arranged at the bottom of the fixed plate (8). The rotation direction of the cleaning mechanism (9) is opposite to that of the support mechanism (4). The support mechanism (4) consists of four rotating rods (12), four support rollers (13), a conveyor belt (14) and a first motor (15). The two ends of the four rotating rods (12) are rotatably connected to the inner walls of the opposite sides of the cleaning tank (2) through bearings. The four support rollers (13) are fixedly sleeved on the outer walls of the rotating rods (12). The conveyor belt (14) is rotatably connected to the four support rollers (13). The four support rollers (13) are distributed in a U-shape. Between the opposite inner walls of the cleaning tank (2), a pressure roller (16) is bolted. The bottom of the pressure roller (16) contacts the top of the conveyor belt (14). One side of the first motor (15) is bolted to one side of the cleaning tank (2), and one end of the first motor (15) is fixedly connected to one end of one of the rotating rods (12). Between the opposite inner walls of the cleaning tank (2), a connecting roller (17) is bolted, and a scraping plate (18) is bolted to one side of the connecting roller (17). One end of the scraping plate (18) contacts the conveyor belt (14). The connecting rollers (17) are symmetrically distributed on both sides of the conveyor belt (14). The adjusting mechanism (5) includes an adjusting seat (19), a threaded rod (21), an adjusting block (23) and a second motor (24). One side of the adjusting seat (19) is bolted to one side of the cleaning tank (2). An adjusting opening (20) is penetrated and opened at a position near the top of one side of the adjusting seat (19). The two ends of the threaded rod (21) are rotatably connected to the opposite sides of the adjusting opening (20) through bearings. The adjusting block (23) is slidably connected to the adjusting opening (20). A threaded opening is penetrated and opened at the top of the adjusting block (23), and the threaded opening is threadedly connected to the threaded rod (21). The second motor (24) is fixedly connected to the top of the adjusting seat (19), and one end of the second motor (24) is bolted to the top of the threaded rod (21). Positioning openings (22) are opened on both sides of the adjusting opening (20) opposite to each other, and a positioning block (25) is slidably connected to the inner walls of the two positioning openings (22). One side of the positioning block (25) is bolted to the adjusting block (23). The cleaning mechanism (9) includes a plurality of side plates (26), two shaft rods (34), two cleaning rollers (32) and a plurality of brush filaments (33). The tops of the plurality of side plates (26) are bolted to the bottom of the fixed plate (8). The two ends of the shaft rod (34) are rotatably connected to the two side plates (26) through bearings.A third motor (29) is connected to one side of the top of the fixing plate (8) by bolts, a first pulley (31) is fixed to one end of the third motor (29) and the outer wall of one of the shafts (34), a first belt (30) is rotatably connected between the two first pulleys (31), a second pulley (36) is fixed to one side of the outer wall of the two shafts (34), a second belt (35) is rotatably connected between the two second pulleys (36), and a plurality of brush wires (33) are fixed to the outer wall of the cleaning roller (32) at equal distances, and the brush wires (33) are made of elastic material.

2. A cleaning device for metal casting processing according to claim 1, characterized in that: The inner wall of the cleaning tank (2) is connected to a limit frame (10) at a position close to the bottom by means of bolts, and the top of the limit frame (10) is connected to a filter plate (11) by means of bolts.

3. A cleaning device for metal casting processing according to claim 1, characterized in that: A swing mechanism (28) is provided at the bottom of the fixed plate (8), and the swing mechanism (28) is located between the two cleaning rollers (32), and the swing mechanism (28) is matched with the cleaning mechanism (9).

4. A cleaning device for metal casting processing according to claim 3, characterized in that: The swing mechanism (28) comprises a connecting plate (27), a rotating shaft (39), two third belt pulleys (37), a third belt (38), a cam (40) and a swing rod (41), wherein the top of the connecting plate (27) is fixedly connected to the bottom of the fixed plate (8), one end of the rotating shaft (39) is rotatably connected to the connecting plate (27) via a bearing, one end of the rotating shaft (39) is connected to the cam (40) via a bolt, one end of the swing rod (41) is connected to a position near the top of one side of the cam (40) via a bolt, an outer wall of the swing rod (41) is rotatably sleeved with a swing roller (42), one of the third belt pulleys (37) is fixedly sleeved on the outer wall of one of the shafts (34), the other third belt pulley (37) is fixedly sleeved on the outer wall of the rotating shaft (39), and the two third belt pulleys (37) are rotatably connected to the third belt (38).

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