A dust-proof support mechanism for a motor shaft of a mixing device

Abstract

The present invention belongs to the field of mechanical technology, and in particular to a dust-proof support mechanism for the motor shaft of a stirring device. In view of the obvious insufficiency of the protective measures for the motor drive shaft position of the current stirring device, the following scheme is proposed, including a fixed bottom shell, fixed bolt plates are welded at both ends of the fixed bottom shell, a first top shell and a second top shell are fixed to the top two sides of the fixed bottom shell by bolts respectively, and the fixed bottom shell, the first top shell and the second top shell are fixed by bolts. The present invention, through the design of an internally arranged air chamber mechanism, drives the crankshaft drive gear to rotate through the crankshaft power gear, so that the crankshaft connecting rod can reciprocate, thereby causing the internal piston block to be repeatedly compressed, and exhausting the internal air after rapid intake, so that the environment inside the mechanism is in a high-pressure state, and the process of exhausting the air outward can be realized, thereby effectively preventing external dust from entering the internal drive component.

Description

Technical Field

[0001] The present invention relates to the field of mechanical technology, and in particular to a dust-proof support mechanism for a motor shaft of a stirring device. Background Art

[0002] The use of mechanical equipment can replace people's traditional handicrafts to achieve a quick and efficient work process. In the use of mixing equipment, the drive assembly can drive the mixing barrel through gear transmission through the drive of the motor, so that the internal materials can be fully mixed. This equipment is often used in building pouring, accompanied by various concrete and cement sand and other building materials. The environment in which it is used is also full of dust and various sands.

[0003] The drive assembly between the motor and the mixing drum of the current mixing equipment adopts a gear transmission method, and the position of the drive assembly is often in a state where the gears are exposed. When protecting it, it is simply sealed by a metal cover. The fixing effect of this method is obviously not very good to prevent the internal drive assembly from entering impurities such as sand. That is, sand entering the drive gear assembly will cause the drive teeth of the gear to be broken, the drive teeth to fall off, and even the risk of the mixing drum tipping over due to the broken drive teeth. The current protection measures for the motor drive shaft position are obviously insufficient. Therefore, a dust-proof support mechanism for the motor shaft of the mixing equipment is proposed. Summary of the Invention

[0004] Based on the technical problem that the protection measures for the motor drive shaft position of the current stirring equipment are obviously insufficient, the present invention proposes a dust-proof support mechanism for the motor shaft of the stirring equipment.

[0005] The present invention proposes a dust-proof support mechanism for the motor shaft of a stirring device, comprising a fixed bottom shell, fixed bolt plates are welded at both ends of the fixed bottom shell, a first top shell and a second top shell are fixed to the top two sides of the fixed bottom shell by bolts respectively, the fixed bottom shell, the first top shell and the second top shell are fixed by bolts, and a sealing gasket is sandwiched between each other, a power input shaft is fixed between the inner walls of both sides of the fixed bottom shell by bearings, and the circumferential inner wall of the power input shaft is located inside the fixed bottom shell and is sleeved with a driving gear, the same output shaft is fixed between the inner walls of the first top shell and the second top shell by bearings, and the circumferential inner wall of the output shaft is fixed to the inner wall of the first top shell and the second top shell by bearings, Gear limiting rods are provided on both sides of the circumferential outer wall, a first output shaft seat is provided on the outer wall of one side of the first top shell, and a second output shaft seat is provided on the outer wall of one side of the second top shell. The circumferential outer wall of the output shaft is located inside the first top shell and the second top shell, and the second output gear is fixed. A vertically arranged shaft rod seat is welded at the top position of the fixed bottom shell, and the first output gear is fixed between the shaft rod seat and the inner wall of one side of the fixed bottom shell through a bearing. The driving gear is meshed with the first output gear, and the first output gear is meshed with the second output gear. An air storage mechanism is provided on the other side of the top of the fixed bottom shell.

[0006] Preferably, the air storage mechanism includes two air storage fixed boxes fixed at one side of the top of the fixed bottom shell, a piston air chamber is opened at one end of the air storage fixed box, and a piston block is provided on the inner wall sealing sliding sleeve of the piston air chamber, a crankshaft is fixed between the shaft rod seat and the inner wall of the other side of the fixed bottom shell through a bearing, and rotating connecting rods are fixed on both sides of the circumferential outer wall of the crankshaft, and the two connecting rods are hinged and fixed to the two piston blocks respectively.

[0007] Preferably, a crankshaft drive gear is sleeved and fixed at the middle position of the circumferential outer wall of the crankshaft, a crankshaft power gear is sleeved and fixed at the top position of the circumferential outer wall of the output shaft, and the bottom of the crankshaft power gear is engaged with the crankshaft drive gear.

[0008] Preferably, an air inlet box and an air outlet box are fixed at the ends away from each other of the two air storage fixed boxes, the air inlet end of the air inlet box extends to the outer wall of the fixed bottom shell, and the fixed bottom shell is located at the air outlet end position of the air inlet box and an air inlet filter plate is fixed by bolts, and the air outlet end of the air outlet box is located in the internal position of the fixed bottom shell.

[0009] Preferably, air intake flaps are fixed on both sides between the top and bottom of the air intake box by bearings, and air intake springs are fixed between the two air intake flaps and the inner walls of the air intake box on both sides, and air outlet flaps are fixed on both sides between the top and bottom of the air outlet box by bearings, and air outlet springs are fixed between the two air outlet flaps and the inner walls of the air outlet box on both sides, one end position of the two air intake flaps are in contact and closed, and the closed end faces the air intake direction of the air intake box, one end position of the two air outlet flaps are in contact and closed, and the closed end faces the air outlet direction of the air outlet box, and the two air intake flaps and the closed end of the two air outlet flaps are both embedded and fixed with rubber sealing heads.

[0010] Preferably, dustproof mechanisms are provided at the positions where the first top shell and the second top shell are in rotational contact with the output shaft. The dustproof mechanisms include dustproof circular grooves opened on the inner walls of one side of the first top shell and the second top shell, and a dustproof rotating ring is fixedly mounted on the circumferential outer wall of the output shaft at the position of the dustproof circular groove.

[0011] Preferably, the circumferential outer wall of the dustproof rotating ring is provided with adjustment slots distributed in a circumferential array, a swinging adjustment seat is fixed to the top of the adjustment slot, a blade is fixed to one side of the top of the adjustment seat by bolts, and a brush rod is fixed to the other side of the top of the adjustment seat by bolts.

[0012] Preferably, a fixing rod is provided at one end of the bottom of the adjustment seat, a fixing rod hole is opened at one end of the adjustment slot, and the fixing rod and the fixing rod hole are rotatably sleeved and fixed, and an adjustment rod is provided at the other end of the bottom of the adjustment seat, an adjustment rod groove is opened at the other end of the adjustment slot, and the adjustment rod is swingably set in the adjustment rod groove and is not fixed.

[0013] Preferably, an inner ring groove is provided on the inner wall of one side of the dustproof rotating ring, and an adjustment inner ring with the same axis is fixed inside the inner ring groove, and an adjustment rod hole distributed in a circumferential array is provided on the circumferential outer wall of the adjustment inner ring, and the adjustment rod is plugged and fixed to the adjustment rod hole, and an electric push rod is fixed between the inner wall of one side of the inner ring groove and the adjustment inner ring by bolts.

[0014] The beneficial effects of the present invention are:

[0015] The dust-proof support mechanism of the motor shaft of the mixing equipment, during the driving process, due to the heavy dust in the operating environment, is designed with an internal air chamber mechanism, and the crankshaft power gear drives the rotation of the crankshaft drive gear, so that the crankshaft connecting rod can reciprocate, thereby causing the internal piston block to be repeatedly compressed, and absorb air from the outside through the air inlet box during contraction, and exhaust the interior through the air outlet box during extension. The gears of the crankshaft power gear and the crankshaft drive gear are relatively large, and the internal exhaust after rapid intake makes the environment inside the mechanism a high-pressure state, which can realize the process of exhausting the air outward, thereby effectively preventing external dust from entering the internal drive components.

[0016] The dust-proof support mechanism of the motor shaft of the stirring equipment is arranged to synchronously drive the operation of the dust-proof mechanism during the driving process, so that the dust-proof rotating ring rotates, and the blades and brush rods arranged at the circumferential position of the dust-proof rotating ring can rotate rapidly. By adjusting the swinging direction of the adjustment seat, adjustment is achieved according to the change of the rotation direction, and the connection part between the output shaft and the first top shell and the second top shell is subjected to the dust-proof process. The angle swing change of the adjustment seat makes it possible to ensure that the wind force of the blades is always discharged to the outside during rotation. In the first embodiment, it is combined with high-pressure exhaust to improve the internal dust-proof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a dust-proof support mechanism for a motor shaft of a stirring device proposed by the present invention;

[0018] Figure 2 This is a schematic diagram of the driving mechanism structure of the dust-proof support mechanism of the motor shaft of a stirring device proposed by the present invention;

[0019] Figure 3 This is a schematic structural diagram of the air chamber mechanism of the dust-proof support mechanism of the motor shaft of a stirring device proposed by the present invention;

[0020] Figure 4 This is a partial structural diagram of the air chamber mechanism of the dust-proof support mechanism of the motor shaft of a stirring device proposed by the present invention;

[0021] Figure 5 This is a schematic diagram of the internal structure of the air inlet box of the dust-proof support mechanism of the motor shaft of a stirring device proposed by the present invention;

[0022] Figure 6 This is a schematic diagram of the air outlet and internal structure of the dust-proof support mechanism of the motor shaft of a stirring device proposed by the present invention;

[0023] Figure 7 A schematic structural diagram of a dust-proof mechanism of a motor shaft dust-proof support mechanism for a stirring device proposed by the present invention;

[0024] Figure 8 This is a schematic diagram of the dust-proof swivel structure of the dust-proof support mechanism for the motor shaft of a stirring device proposed by the present invention;

[0025] Figure 9 This is a schematic diagram of the partial structure of the dust-proof swivel of the dust-proof support mechanism of the motor shaft of a stirring device proposed by the present invention;

[0026] Figure 10 The present invention proposes a dust-proof support mechanism for the motor shaft of a stirring device. Figure 9 Schematic diagram of the enlarged structure of part A.

[0027] In the figure: 1, fixed bottom shell; 2, power input shaft; 3, first output shaft seat; 4, first top shell; 5, second output shaft seat; 6, second top shell; 7, air intake filter plate; 8, fixed bolt plate; 9, drive gear; 10, first output gear; 11, gear limit rod; 12, output shaft; 13, second output gear; 14, air chamber mechanism; 15, air intake box; 16, air outlet box; 17, air chamber fixing box; 18, connecting rod; 19, crankshaft; 20, crankshaft drive gear; 21, crankshaft Shaft power gear; 22. Shaft rod seat; 23. Piston block; 24. Piston air chamber; 25. Inlet flap block; 26. Inlet top spring; 27. Rubber sealing head; 28. Exhaust top spring; 29. ​​Exhaust flap block; 30. Dustproof circular groove; 31. Dustproof swivel; 32. Adjustment slot hole; 33. Adjustment seat; 34. Blade; 35. Brush rod; 36. Adjustment inner ring; 37. Inner ring groove; 38. Adjustment rod groove; 39. Adjustment rod; 40. Fixing rod; 41. Fixing rod hole; 42. Adjustment rod hole. Implementation Method

[0028] Example 1, refer to Figures 1-6, a dust-proof support mechanism for the motor shaft of a mixing equipment, comprising a fixed bottom shell 1, fixed bolt plates 8 are welded at both ends of the fixed bottom shell 1, a first top shell 4 and a second top shell 6 are fixed to the top two sides of the fixed bottom shell 1 by bolts respectively, the fixed bottom shell 1, the first top shell 4 and the second top shell 6 are fixed by bolts, and a sealing gasket is sandwiched between each other, a power input shaft 2 is fixed between the inner walls of both sides of the fixed bottom shell 1 through bearings, and the circumferential inner wall of the power input shaft 2 is located inside the fixed bottom shell 1 and is sleeved with a driving gear 9, the same output shaft 12 is fixed between the inner walls of the first top shell 4 and the second top shell 6 by bearings, and the circumferential outer wall of the output shaft 12 is provided on both sides. A gear limiting rod 11 is provided, and a first output shaft seat 3 is provided on the outer wall of one side of the first top shell 4 on which the output shaft 12 is located. A second output shaft seat 5 is provided on the outer wall of one side of the second top shell 6 on which the output shaft 12 is located. The circumferential outer wall of the output shaft 12 is located inside the first top shell 4 and the second top shell 6 and is fixed with a second output gear 13. A vertically arranged shaft rod seat 22 is welded at the top position of the fixed bottom shell 1. A first output gear 10 is fixed between the shaft rod seat 22 and the inner wall of one side of the fixed bottom shell 1 through a bearing. The driving gear 9 is engaged with the first output gear 10, and the first output gear 10 is engaged with the second output gear 13. An air storage mechanism 14 is provided on the other side of the top of the fixed bottom shell 1.

[0029] Furthermore, the air storage mechanism 14 includes two air storage fixed boxes 17 fixed at one side of the top of the fixed bottom shell 1. A piston air chamber 24 is opened at one end of the air storage fixed box 17, and a piston block 23 is provided in the inner wall sealing sliding sleeve of the piston air chamber 24. A crankshaft 19 is fixed between the shaft rod seat 22 and the inner wall of the other side of the fixed bottom shell 1 through a bearing. Rotating connecting rods 18 are fixed on both sides of the circumferential outer wall of the crankshaft 19. The two connecting rods 18 are hingedly fixed to the two piston blocks 23 respectively.

[0030] Furthermore, a crankshaft drive gear 20 is sleeved and fixed in the middle position of the circumferential outer wall of the crankshaft 19, and a crankshaft power gear 21 is sleeved and fixed at the top position of the circumferential outer wall of the output shaft 12, and the bottom of the crankshaft power gear 21 is meshed with the crankshaft drive gear 20;

[0031] Furthermore, an air inlet box 15 and an air outlet box 16 are fixed to the ends away from each other of the two air storage fixed boxes 17. The air inlet end of the air inlet box 15 extends to the outer wall of the fixed bottom shell 1, and the fixed bottom shell 1 is fixed with an air inlet filter plate 7 at the air outlet end of the air inlet box 15 by bolts. The air outlet end of the air outlet box 16 is located inside the fixed bottom shell 1.

[0032] Furthermore, air intake flaps 25 are fixed on both sides between the top and bottom of the air intake box 15 through bearings, and air intake springs 26 are fixed between the two air intake flaps 25 and the inner walls of the air intake box 15 on both sides. Air outlet flaps 29 are fixed on both sides between the top and bottom of the air outlet box 16 through bearings, and air outlet springs 28 are fixed between the two air outlet flaps 29 and the inner walls of the air outlet box 16 on both sides. One end of the two air intake flaps 25 are in contact and closed, and the closed end is facing the air intake direction of the air intake box 15. One end of the two air outlet flaps 29 are in contact and closed, and the closed end is facing the air outlet direction of the air outlet box 16. The closed ends of the two air intake flaps 25 and the two air outlet flaps 29 are both embedded and fixed with rubber sealing heads 27.

[0033] When the present invention is used: the entire supporting mechanism device is fixed to the appropriate position of the stirring equipment by fixing the bolt plate 8, the stirring tank drive shaft and the output shaft 12 are fixed coaxially, and the drive shaft of the motor is fixed to the power input shaft 2. The power input of the motor can make the internal part of the mechanism transmit, thereby ensuring the operation of the stirring equipment; during the internal operation process, due to the large dust in the use environment, through the design of the internal air storage mechanism 14, the crankshaft power gear 21 drives the rotation of the crankshaft drive gear 20, which can make the crankshaft 19 and the connecting rod 18 reciprocate, thereby making the internal piston block 23 repeatedly compressed, and absorb air from the outside through the air inlet box 15 when contracting, and exhaust the interior through the air outlet box 16 when extending, and the gears of the crankshaft power gear 21 and the crankshaft drive gear 20 are relatively large, and the internal exhaust after rapid air inhalation makes the environment inside the mechanism into a high-pressure state, which can realize the process of exhausting to the outside, thereby effectively preventing external dust from entering the internal drive component.

[0034] Embodiment 2. Based on embodiment 1, this embodiment further includes a dust-proof support mechanism for the motor shaft of a stirring equipment, wherein dust-proof mechanisms are provided at positions where the first top shell 4 and the second top shell 6 rotate and contact with the output shaft 12. The dust-proof mechanism includes a dust-proof circular groove 30 opened on the inner wall of one side of the first top shell 4 and the second top shell 6, and a dust-proof rotating ring 31 is fixedly mounted on the circumferential outer wall of the output shaft 12 at the position of the dust-proof circular groove 30.

[0035] Furthermore, the outer wall of the dustproof swivel 31 is provided with adjustment slots 32 distributed in a circumferential array. A swinging adjustment seat 33 is fixed to the top of the adjustment slot 32. A blade 34 is fixed to one side of the top of the adjustment seat 33 by bolts. A brush rod 35 is fixed to the other side of the top of the adjustment seat 33 by bolts.

[0036] Furthermore, a fixing rod 40 is provided at one end of the bottom of the adjustment seat 33, and a fixing rod hole 41 is opened at one end of the adjustment slot 32, and the fixing rod 40 and the fixing rod hole 41 are rotatably sleeved and fixed. An adjustment rod 39 is provided at the other end of the bottom of the adjustment seat 33, and an adjustment rod groove 38 is opened at the other end of the adjustment slot 32, and the adjustment rod 39 is swingably set in the adjustment rod groove 38 and is not fixed;

[0037] Furthermore, an inner ring groove 37 is provided on the inner wall of one side of the dustproof rotating ring 31, and an adjustment inner ring 36 with the same axis is fixed inside the inner ring groove 37, and an adjustment rod hole 42 distributed in a circumferential array is provided on the circumferential outer wall of the adjustment inner ring 36, and the adjustment rod 39 is plugged and fixed to the adjustment rod hole 42, and an electric push rod is fixed between the inner wall of one side of the inner ring groove 37 and the adjustment inner ring 36 by bolts.

[0038] When the present invention is in use, the dust-proof mechanism is driven synchronously during the driving process, so that the dust-proof rotating ring 31 rotates, and the blades 34 and the brush rod 35 arranged at the circumferential position of the dust-proof rotating ring 31 can rotate rapidly, and by adjusting the swinging direction of the adjustment seat 33, adjustment is achieved according to the change of the rotation direction, and the connection part of the output shaft 12 and the first top shell 4 and the second top shell 6 is subjected to the dust-proof process. By changing the angle of the adjustment seat 33, the wind force of the blade 34 is always discharged to the outside during rotation. In the first embodiment, it is combined with high-pressure exhaust to improve the internal dust-proof effect.

[0039] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A dust-proof support mechanism for a motor shaft of a stirring device, comprising a fixed bottom shell (1), fixed bolt plates (8) welded to both ends of the fixed bottom shell (1), a first top shell (4) and a second top shell (6) fixed to both sides of the top of the fixed bottom shell (1) by bolts, the fixed bottom shell (1), the first top shell (4) and the second top shell (6) being fixed by bolts, and a sealing gasket being sandwiched between them, characterized in that: A power input shaft (2) is fixed between the inner walls of both sides of the fixed bottom shell (1) via bearings, and a driving gear (9) is sleeved on the circumferential inner wall of the power input shaft (2) located inside the fixed bottom shell (1). A same output shaft (12) is fixed between the inner walls of the first top shell (4) and the second top shell (6) via bearings, and gear limiting rods (11) are provided on both sides of the circumferential outer wall of the output shaft (12). A first output shaft seat (3) is provided on the outer wall of one side of the output shaft (12) located on the first top shell (4), and a second output shaft seat (3) is provided on the outer wall of one side of the output shaft (12) located on the second top shell (6). An output shaft seat (5), the circumferential outer wall of the output shaft (12) is located inside the first top shell (4) and the second top shell (6), and a second output gear (13) is fixed thereto. A vertically arranged shaft seat (22) is welded to the top of the fixed bottom shell (1), and a first output gear (10) is fixed between the shaft seat (22) and the inner wall of one side of the fixed bottom shell (1) via a bearing. The driving gear (9) is meshed with the first output gear (10), and the first output gear (10) is meshed with the second output gear (13). An air storage mechanism (14) is provided at the other side of the top of the fixed bottom shell (1); The gas chamber mechanism (14) comprises two gas chamber fixed boxes (17) fixed at one side of the top of the fixed bottom shell (1), a piston air chamber (24) is opened at one end of the gas chamber fixed box (17), and a piston block (23) is provided on the inner wall of the piston air chamber (24) in a sealing sliding sleeve, a crankshaft (19) is fixed between the shaft rod seat (22) and the inner wall of the other side of the fixed bottom shell (1) through a bearing, a rotating connecting rod (18) is fixed on both sides of the circumferential outer wall of the crankshaft (19), the two connecting rods (18) are hingedly fixed to the two piston blocks (23), and a crankshaft drive is sleeved and fixed in the middle position of the circumferential outer wall of the crankshaft (19). The crankshaft drive gear (20) is provided on a circumferential outer wall of the output shaft (12) and is sleeved and fixed with a crankshaft power gear (21) at the top position of the crankshaft drive gear (20), and the bottom of the crankshaft power gear (21) is meshed with the crankshaft drive gear (20). An air inlet box (15) and an air outlet box (16) are fixed to the ends of the two air chamber fixed boxes (17) away from each other, the air inlet end of the air inlet box (15) extends to the outer wall of the fixed bottom shell (1), and the fixed bottom shell (1) is fixed with an air inlet filter plate (7) at the air outlet end position of the air inlet box (15) by bolts, and the air outlet end of the air outlet box (16) is located at an inner position of the fixed bottom shell (1).

2. The dust-proof support mechanism for the motor shaft of a stirring device according to claim 1, characterized in that: Inlet flaps (25) are fixed to both sides of the top and bottom of the air inlet box (15) through bearings, and air inlet springs (26) are fixed between the two air inlet flaps (25) and the inner walls of both sides of the air inlet box (15). Outlet flaps (29) are fixed to both sides of the top and bottom of the air outlet box (16) through bearings, and air outlet springs (28) are fixed between the two air outlet flaps (29) and the inner walls of both sides of the air outlet box (16). One end position of the two air inlet flaps (25) is in contact and closed, and the closed end faces the air inlet direction of the air inlet box (15). One end position of the two air outlet flaps (29) is in contact and closed, and the closed end faces the air outlet direction of the air outlet box (16). The closed ends of the two air inlet flaps (25) and the two air outlet flaps (29) are both fitted with rubber sealing heads (27).

3. The dust-proof support mechanism for the motor shaft of a stirring device according to claim 1, characterized in that: A dustproof mechanism is provided at the position where the first top shell (4) and the second top shell (6) are in rotational contact with the output shaft (12), and the dustproof mechanism comprises a dustproof circular groove (30) provided on the inner wall of one side of the first top shell (4) and the second top shell (6), and a dustproof rotating ring (31) is sleeved and fixed on the circumferential outer wall of the output shaft (12) at the position of the dustproof circular groove (30).

4. The dust-proof support mechanism for the motor shaft of a stirring device according to claim 3, characterized in that: The outer circumferential wall of the dustproof rotating ring (31) is provided with adjustment slots (32) distributed in a circumferential array, a swinging adjustment seat (33) is fixed to the top of the adjustment slot (32), a blade (34) is fixed to one side of the top of the adjustment seat (33) by means of bolts, and a brush rod (35) is fixed to the other side of the top of the adjustment seat (33) by means of bolts.

5. The dust-proof support mechanism for the motor shaft of a stirring device according to claim 4, characterized in that: A fixing rod (40) is provided at one end of the bottom of the adjustment seat (33), a fixing rod hole (41) is provided at one end of the adjustment slot hole (32), and the fixing rod (40) and the fixing rod hole (41) are rotatably sleeved and fixed. An adjustment rod (39) is provided at the other end of the bottom of the adjustment seat (33), an adjustment rod groove (38) is provided at the other end of the adjustment slot hole (32), and the adjustment rod (39) is swingably arranged in the adjustment rod groove (38) and is not fixed.

6. The dust-proof support mechanism for the motor shaft of a stirring device according to claim 5, characterized in that: An inner ring groove (37) is provided on the inner wall of one side of the dustproof rotating ring (31), and an adjusting inner ring (36) having the same axis is fixed inside the inner ring groove (37). Adjusting rod holes (42) distributed in a circumferential array are provided on the circumferential outer wall of the adjusting inner ring (36). The adjusting rod (39) is plugged and fixed to the adjusting rod hole (42). An electric push rod is fixed between the inner wall of one side of the inner ring groove (37) and the adjusting inner ring (36) by bolts.

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