Solar cell turnover device

Abstract

The invention relates to the field of battery pieces, and discloses a solar battery piece overturning device which comprises fixing frames, the fixing frames are provided with an overturning mechanism, the overturning mechanism comprises a rotating cylinder, the rotating cylinder is rotationally arranged between the two fixing frames, and four open overturning grooves are formed in the outer side of the rotating cylinder; a cleaning mechanism is mounted on the fixing frame and comprises a supporting frame, and the supporting frame is of a U-shaped structure; gas is discharged downwards through a plurality of gas outlets in the lower end of the gas guide cylinder and blown to the surface of a battery piece in the overturning process, dust and impurities are removed, when the battery piece is overturned and passes through the supporting frame, the gas blows away the dust on the other face of the battery piece, and in the dust removing process, the reciprocating lead screw rotates to drive the sliding base to move back and forth along the supporting frame; the opening sleeve is driven to move along the length direction of the air guide cylinder, so that the cleaning sponge moves to clean pollutants at the air outlet at the lower end of the air guide cylinder, the air outlet is prevented from being blocked, and air is blown out to clean the surface of the battery piece.

Description

Technical Field

[0001] The invention relates to the technical field of solar cells, and in particular to a solar cell flipping device. Background Art

[0002] Solar cells work based on the principle of the photoelectric effect. When sunlight shines on the cell, photons are absorbed by the semiconductor material, allowing the electrons in the semiconductor to gain enough energy to jump from the valence band to the conduction band, thereby generating electron-hole pairs. Under the action of the electric field inside the cell (usually formed by structures such as PN junctions), electrons and holes move to the two poles of the cell respectively, thus forming an electric potential difference between the two poles. When the external circuit is connected, current will flow, realizing the conversion of solar energy into electrical energy.

[0003] In the production process of solar cells, it is sometimes necessary to flip the cells over, such as during double-sided processing, testing the performance of different sides, or subsequent assembly. The flipping device can accurately, smoothly and efficiently flip the cells, avoiding problems such as damage and scratches on the cells that may be caused by manual flipping, ensuring product quality, while also improving production efficiency and meeting the rhythm requirements of large-scale production.

[0004] As solar cells are being transported and flipped, the surface of the panels will inevitably be stained with dust, pollutants and other impurities. It is not easy to clean the surface impurities during the flipping process, which is not conducive to the subsequent processing and packaging of the panels. Even if they are lifted up for cleaning, impurities may easily adhere to the panels during the flipping process.

[0005] Based on this, a solar cell flipping device is proposed here to solve the above problem. Summary of the invention

[0006] In order to overcome the above technical problems, the object of the present invention is to provide a solar cell flipping device, and the object of the present invention can be achieved by the following technical solutions:

[0007] A solar cell flipping device comprises a fixing frame, the fixing frame is equipped with a flipping mechanism, the flipping mechanism comprises a rotating drum, the rotating drum is rotatably arranged between two fixing frames, and the outer side of the rotating drum is provided with four open flipping grooves;

[0008] The fixing frame is installed with a cleaning mechanism, which includes a support frame, the support frame is a U-shaped structure, the bottom end of the support frame is respectively fixed to the ends of the two fixing frames, the support frame is fixed with a transversely arranged air guide cylinder, the lower end of the air guide cylinder is penetrated with a linearly distributed air outlet, the outer surface of the air guide cylinder is slidably provided with an open sleeve, the upper end of the open sleeve is rotatably connected with a sliding seat, the top end of the sliding seat is horizontally slidably connected with the support frame, and the bottom end of the open sleeve is slidably inserted with a cleaning sponge;

[0009] The support frame is equipped with a collecting mechanism for the walking and swinging of the open sleeve;

[0010] The fixing frame is provided with a driving mechanism for driving the rotating drum to rotate and flip the battery sheets.

[0011] Preferably, the collecting mechanism includes a fixed rod, which is fixed to one side of the fixed frame, a transversely arranged straight plate is fixed to the end of the fixed rod, and the straight plate is penetrated by transversely arranged semicircular holes, a movable ball is fixed to one side of the open sleeve, and the movable ball is inserted into one of the semicircular holes, and a torsion spring is installed between the rotating point at the upper end of the open sleeve and the sliding seat.

[0012] Preferably, the cleaning mechanism further comprises a collecting box, wherein the collecting box with an opening at the upper end is mounted at the lower end of the cleaning sponge, the cleaning sponge is provided with a collecting port therethrough, and the upper surface of the cleaning sponge is in contact with the lower surface of the air guide cylinder.

[0013] Preferably, the open sleeve is provided with a placement groove for installing a cleaning sponge, the open sleeve is threadedly connected with a mounting bolt, the fixed frame is rotatably connected with a reciprocating screw, the reciprocating screw is threadedly connected to the sliding seat, a motor 1 is fixed to one side of the support frame, the output shaft of the motor 1 is connected to the end of the reciprocating screw, and an intake manifold is fixed to one end of the air guide cylinder.

[0014] Preferably, the flipping mechanism also includes a rotating shaft, which is fixedly connected to the center of the rotating drum and rotatably connected to the fixed frame. Four spring telescopic rods are fixed to the end of the rotating drum, and a clamping block is fixed to the telescopic end of the spring telescopic rod. The clamping block is slidably connected to the rotating drum and the end thereof extends into the flipping groove, and an inclined guide plate is fixed to one end of the clamping block.

[0015] Preferably, the driving mechanism comprises a mounting frame, a stepper motor is fixed to the mounting frame, a gear 1 is fixed to the output shaft of the stepper motor, a gear 2 is fixed to the end of the rotating shaft, and the gear 2 is meshingly connected to the gear 1.

[0016] Preferably, the fixed frame is equipped with an introduction mechanism, and the introduction mechanism includes a support rod, the support rod is fixed on one side of the fixed frame, a support plate is fixed on the upper end of the support rod, two guide plates with a V-shaped structure are fixed on the upper end of the support plate, a mounting rod is fixed on one side of the fixed frame, a discharge plate is fixed on the upper end of the mounting rod, and the rotating drum is located between the support plate and the discharge plate.

[0017] Preferably, a buffer block is slidably connected to one side of the rotating drum, a spring is fixed between the end of the buffer block and the rotating drum, the other end of the buffer block extends into the inside of the flip groove, and the movement of the buffer block is an arc-shaped structure.

[0018] Beneficial effects of the present invention:

[0019] 1. The gas of the present invention is discharged downward through multiple air outlets at the lower end of the air guide cylinder and blown to the surface of the battery cell in the flipping process to clean dust and impurities. When the battery cell flips and passes through the support frame, the gas blows away the dust on the other side of the battery cell. During the cleaning process, the reciprocating screw rotates to drive the sliding seat to move back and forth along the support frame, driving the open sleeve to move along the length direction of the air guide cylinder, so that the cleaning sponge moves to clean the pollutants at the air outlet position at the lower end of the air guide cylinder, avoiding blockage of the air outlet, and allowing the gas to be blown out to clean the surface of the battery cell.

[0020] 2. When the open sleeve moves along the air guide cylinder, it drives the movable ball to move along the direction of the straight plate. When the movable ball moves out of the semicircular hole and contacts the outer surface of the straight plate, it is squeezed and moved by the straight plate, pushing the open sleeve to rotate slightly, compressing the torsion spring to generate elastic force. When the movable ball moves into the semicircular hole, the torsion spring pushes the open sleeve to rotate and reset. In this way, during the movement of the open sleeve and the movable ball entering and exiting the semicircular hole, the open sleeve can swing back and forth, and the cleaning sponge in the open sleeve can move back and forth to rub the air guide cylinder, which can more quickly clean the pollutants at the blowing port and ensure ventilation of the air outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 A schematic diagram of the structure of a solar cell flipping device provided by the present invention;

[0023] Figure 2 The present invention Figure 1 An enlarged schematic diagram of part A is shown;

[0024] Figure 3 It is a schematic diagram of the cleaning mechanism of the present invention;

[0025] Figure 4 It is a schematic diagram of the cleaning mechanism and the collecting mechanism of the present invention;

[0026] Figure 5 The present invention Figure 1 An enlarged schematic diagram of part B is shown;

[0027] Figure 6 It is a schematic diagram of the rotary drum and cleaning mechanism of the present invention;

[0028] Figure 7 The present invention Figure 6 An enlarged schematic diagram of part C is shown.

[0029] In the figure: 1. fixed frame; 2. turning mechanism; 21. rotating drum; 22. rotating shaft; 23. spring telescopic rod; 24. turning groove; 25. guide plate; 26. clamping block; 3. driving mechanism; 31. stepping motor; 32. mounting frame; 33. gear 1; 34. gear 2; 4. cleaning mechanism; 41. supporting frame; 42. air guide cylinder; 43. reciprocating screw rod; 44. motor 1; 45. intake manifold; 46. sliding seat; 47. open sleeve; 48. cleaning Sponge; 49, mounting bolt; 410, placement groove; 411, collection port; 412, air outlet; 5, collection mechanism; 51, straight plate; 52, semicircular hole; 53, collection box; 54, fixing rod; 55, torsion spring; 56, movable ball; 6, introduction mechanism; 61, support plate; 62, guide plate; 63, support rod; 64, discharge plate; 65, mounting rod; 66, spring one; 67, buffer block; 7, battery cell; 8, conveyor belt one; 9, conveyor belt two. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1

[0032] See also Figure 1 - Figure 7 As shown, a solar cell flipping device comprises a fixing frame 1, the fixing frame 1 is equipped with a flipping mechanism 2, the flipping mechanism 2 comprises a rotating drum 21, the rotating drum 21 is rotatably arranged between two fixing frames 1, and four open flipping grooves 24 are formed on the outer side of the rotating drum 21; when the solar cell 7 is conveyed to the inside of the flipping groove 24 by the conveyor belt 8, the rotating drum 21 rotates 90 degrees clockwise to drive the solar cell 7 to rotate and flip, thereby turning over, and the four flipping grooves 24 can realize the continuous flipping of the solar cell 7;

[0033] The fixing frame 1 is equipped with a cleaning mechanism 4, which includes a support frame 41. The support frame 41 is a U-shaped structure. The bottom ends of the support frame 41 are respectively fixed to the ends of the two fixing frames 1. The support frame 41 is fixed with a transversely arranged air guide tube 42. The lower end of the air guide tube 42 is penetrated with a linearly distributed air outlet 412. The outer surface of the air guide tube 42 is slidably provided with an open sleeve 47. The upper end of the open sleeve 47 is rotatably connected with a sliding seat 46. The top end of the sliding seat 46 is horizontally slidably connected to the support frame 41. The bottom end of the open sleeve 47 is slidably inserted with a cleaning sponge 48. When working, when the rotating drum 21 rotates to drive the battery cell 7 to flip, The gas is sent into the air guide cylinder 42, and is discharged downward through the multiple air outlets 412 at the lower end of the air guide cylinder 42 to blow toward the surface of the battery cell 7 during the flipping process to clean dust and impurities. When the battery cell 7 flips and passes through the support frame 41, the gas blows away the dust on the other side of the battery cell 7. During the dust cleaning process, the reciprocating screw 43 rotates to drive the sliding seat 46 to move back and forth along the support frame 41, driving the open sleeve 47 to move along the length direction of the air guide cylinder 42, so that the cleaning sponge 48 moves to clean the pollutants at the position of the air outlet 412 at the lower end of the air guide cylinder 42, avoiding blockage of the air outlet 412, and allowing the gas to be blown out to clean the surface of the battery cell 7;

[0034] The support frame 41 is equipped with a collecting mechanism 5 for the open sleeve 47 to move and swing;

[0035] The fixing frame 1 is equipped with a driving mechanism 3 for driving the rotating drum 21 to rotate and flip the battery sheet 7 .

[0036] In this embodiment, in order to achieve the back and forth swing of the cleaning sponge 48, refer to Figure 2 , Figure 3The collecting mechanism 5 includes a fixing rod 54, which is fixed to one side of the fixing frame 1. A transversely arranged straight plate 51 is fixed to the end of the fixing rod 54. The straight plate 51 is penetrated with a transversely arranged semicircular hole 52. A movable ball 56 is fixed to one side of the open sleeve 47. The movable ball 56 is inserted into one of the semicircular holes 52. A torsion spring 55 is installed between the rotation point at the upper end of the open sleeve 47 and the sliding seat 46. The cleaning mechanism 4 also includes a collecting box 53. The collecting box 53 with an opening at the upper end is installed at the lower end of the cleaning sponge 48. The cleaning sponge 48 is penetrated with a collecting port 411. The upper surface of the cleaning sponge 48 is in contact with the lower surface of the air guide cylinder 42. When working, when the open sleeve 47 moves along the air guide cylinder When the movable ball 56 moves out of the semicircular hole 52 and contacts the outer surface of the straight plate 51, it is squeezed and moved by the straight plate 51, pushing the open sleeve 47 to rotate slightly, compressing the torsion spring 55 to generate elastic force. When the movable ball 56 moves into the semicircular hole 52, the torsion spring 55 pushes the open sleeve 47 to rotate and reset. In this way, during the movement of the open sleeve 47 and the movable ball 56 entering and exiting the semicircular hole 52, the open sleeve 47 can swing back and forth during the movement, and the cleaning sponge 48 in the open sleeve 47 can move back and forth to rub the air guide cylinder 42, so that the pollutants at the blowing port can be cleaned more quickly, and the ventilation of the air outlet 412 can be ensured.

[0037] In order to realize the back and forth movement of the cleaning sponge 48, the open sleeve 47 is provided with a placement groove 410 for installing the cleaning sponge 48, the open sleeve 47 is threadedly connected with a mounting bolt 49, the fixed frame 1 is rotatably connected with a reciprocating screw 43, the reciprocating screw 43 is threadedly connected with the sliding seat 46, a motor 44 is fixed to one side of the support frame 41, the output shaft of the motor 44 is connected to the end of the reciprocating screw 43, and an air intake manifold 45 is fixed to one end of the air guide cylinder 42; during operation, when the cleaning sponge 48 moves with the sliding seat 46 to clean the air outlet 412, the inner side of the upper end of the cleaning sponge 48 sends the pollutants scraped off the lower surface of the air guide cylinder 42 into the collecting port 411, and then the pollutants are discharged from the collecting port 411 falls into the collection box 53 for collection to reduce dust splashing. The mounting bolts 49 are used to fix the cleaning sponge 48 to the open sleeve 47. After the mounting bolts 49 are removed, the cleaning sponge 48 can be taken out for dust removal and cleaning. The lower end of the air intake manifold 45 is externally connected to an air pump, and the gas is input into the air guide cylinder 42 through the air intake manifold 45, and then blown out from the air outlet 412 at the lower end to clean the surface of the battery cell 7. During the cleaning process, the reciprocating screw 43 is driven to rotate by the motor 44, driving the sliding seat 46 to move back and forth, driving the open sleeve 47 to move, so that the cleaning sponge 48 moves back and forth at the lower end of the air guide cylinder 42 to scrape the pollutants, ensuring that the air outlet 412 flows and blows.

[0038] Furthermore, the flipping mechanism 2 also includes a rotating shaft 22, which is fixedly connected to the center of the rotating drum 21, and the rotating shaft 22 is rotatably connected to the fixed frame 1. Four spring telescopic rods 23 are fixed to the end of the rotating drum 21, and a clamping block 26 is fixed to the telescopic end of the spring telescopic rod 23. The clamping block 26 is slidably connected to the rotating drum 21 and the end thereof extends into the inside of the flipping groove 24. One end of the clamping block 26 is fixed with an inclined guide plate 25; when the battery cell 7 is transported to the inside of the flipping groove 24 via the conveyor belt, inertia causes the end of the battery cell 7 to contact the wedge-shaped surface of the guide plate 25, pushing the wedge-shaped surface to move, causing the clamping block 26 to slide, causing the spring contraction rod to contract and be in a compressed state, until the battery cell 7 is clamped in the flipping groove 24 by the clamping block 26, providing a certain clamping force for the flipping process of the battery cell 7, so that the battery cell 7 is flipped to clean the surface.

[0039] In order to realize the rotation of the rotating drum 21, the driving mechanism 3 includes a mounting frame 32, on which a stepper motor 31 is fixed, and a gear 1 33 is fixed to the output shaft of the stepper motor 31, and a gear 2 34 is fixed to the end of the rotating shaft 22, and the gear 2 34 is meshed and connected with the gear 1 33; the stepper motor 31 drives the gear 1 33 to rotate, and drives the gear 2 34 to rotate, so as to realize the rotation of the rotating shaft 22 and the rotating drum 21, and drive the battery cell 7 to flip, and the stepper motor 31 rotates by 90 degrees each time until the battery cell 7 is flipped from the conveyor belt 1 8 to the conveyor belt 2 9.

[0040] In this embodiment, the fixed frame 1 is equipped with an introduction mechanism 6, and the introduction mechanism 6 includes a support rod 63, the support rod 63 is fixed on one side of the fixed frame 1, a support plate 61 is fixed on the upper end of the support rod 63, and two guide plates 62 with a V-shaped structure are fixed on the upper end of the support plate 61. A mounting rod 65 is fixed on one side of the fixed frame 1, and a discharge plate 64 is fixed on the upper end of the mounting rod 65. The rotating drum 21 is located between the pallet 61 and the discharge plate 64. The battery cell 7 is transported to the pallet 61 via the conveyor belt 8, directly enters the flip groove 24 and is clamped by the clamping block 26, and then rotates and flips through the rotating drum 21, and is blown up and cleaned until it is flipped onto the discharge plate 64 and transported out via the conveyor belt 29.

[0041] A buffer block 67 is slidably connected to one side of the rotating drum 21, and a spring 66 is fixed between the end of the buffer block 67 and the rotating drum 21. The other end of the buffer block 67 extends into the inside of the flip groove 24. The movement of the buffer block 67 is an arc structure. When the battery cell 7 is transported to the flip groove 24 via the conveyor belt 8, it contacts the buffer block 67, pushing the buffer block 67 to move the compressed spring 66 to buffer the battery cell 7.

[0042] Working principle: the battery cell 7 is transported into the flip groove 24 through the conveyor belt 8, clamped by the clamp block 26, and the stepper motor 31 is started to drive the gear 1 33 to rotate, which drives the gear 2 34 to rotate, realizes the rotation of the shaft 22 and the drum 21, and drives the battery cell 7 to flip. During the flipping process, the gas is sent into the air guide cylinder 42, and is discharged downward through the multiple air outlets 412 at the lower end of the air guide cylinder 42 to blow to the surface of the battery cell 7 during the flipping process to clean dust and impurities. When the battery cell 7 flips and passes through the support frame 41, the gas blows away the dust on the other side of the battery cell 7. During the dust cleaning process, the reciprocating screw rod 43 is driven to rotate by the motor 1 44 to drive the sliding The seat 46 moves back and forth, driving the open sleeve 47 to move, so that the cleaning sponge 48 moves back and forth at the lower end of the air guide cylinder 42 to scrape the pollutants. During the movement of the open sleeve 47, the movable ball 56 is driven to move along the direction of the straight plate 51. During the process of the movable ball 56 entering and exiting the semicircular hole 52, the open sleeve 47 is swung back and forth during its movement, so that the cleaning sponge 48 in the open sleeve 47 moves back and forth to rub the air guide cylinder 42, which can more quickly clean the pollutants at the blowing port position and ensure the ventilation of the air outlet 412. Then the rotating drum 21 continues to rotate to drive the battery cell 7 to flip to the discharge plate 64 until it is transported away on the conveyor belt 2 9 for processing.

[0043] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A solar cell flipping device, comprising a fixing frame (1), wherein the fixing frame (1) is equipped with a flipping mechanism (2), characterized in that: The turning mechanism (2) comprises a rotating drum (21), the rotating drum (21) is rotatably arranged between two fixed frames (1), and four open turning grooves (24) are formed on the outer side of the rotating drum (21); The fixing frame (1) is provided with a cleaning mechanism (4), the cleaning mechanism (4) comprising a support frame (41), the support frame (41) being of a U-shaped structure, the bottom end of the support frame (41) being respectively fixed to the ends of the two fixing frames (1), the support frame (41) being fixed with a transversely arranged air guide cylinder (42), the lower end of the air guide cylinder (42) being penetrated by an air outlet (412) distributed in a linear manner, the outer surface of the air guide cylinder (42) being slidably provided with an open sleeve (47), the upper end of the open sleeve (47) being rotatably connected with a sliding seat (46), the top end of the sliding seat (46) being horizontally slidably connected with the support frame (41), the bottom end of the open sleeve (47) being slidably inserted with a cleaning sponge (48); The support frame (41) is equipped with a collecting mechanism (5) for the open sleeve (47) to move and swing; The fixing frame (1) is provided with a driving mechanism (3) for driving a rotating drum (21) to rotate and flip the battery sheet (7).

2. A solar cell flipping device according to claim 1, characterized in that: The collecting mechanism (5) comprises a fixing rod (54), the fixing rod (54) being fixed to one side of the fixing frame (1), a laterally arranged straight plate (51) being fixed to the end of the fixing rod (54), a laterally arranged semicircular hole (52) being passed through the straight plate (51), a movable ball (56) being fixed to one side of the opening sleeve (47), the movable ball (56) being inserted into one of the semicircular holes (52), and a torsion spring (55) being installed between the rotation point at the upper end of the opening sleeve (47) and the sliding seat (46).

3. The solar cell flipping device according to claim 1, characterized in that: The cleaning mechanism (4) further comprises a collecting box (53), wherein the collecting box (53) with an opening at the upper end is mounted at the lower end of a cleaning sponge (48), wherein a collecting port (411) is provided through the cleaning sponge (48), and the upper surface of the cleaning sponge (48) is in contact with the lower surface of the air guide cylinder (42).

4. The solar cell flipping device according to claim 1, characterized in that: The open sleeve (47) is provided with a placement groove (410) for installing a cleaning sponge (48), the open sleeve (47) is threadedly connected with a mounting bolt (49), the fixed frame (1) is rotatably connected with a reciprocating screw rod (43), the reciprocating screw rod (43) is threadedly connected with a sliding seat (46), a motor 1 (44) is fixed to one side of the support frame (41), the output shaft of the motor 1 (44) is connected to the end of the reciprocating screw rod (43), and an intake manifold (45) is fixed to one end of the air guide cylinder (42).

5. The solar cell flipping device according to claim 1, characterized in that: The turning mechanism (2) further comprises a rotating shaft (22), the rotating shaft (22) being fixedly connected to the central part of the rotating drum (21), the rotating shaft (22) being rotatably connected to the fixed frame (1), four spring telescopic rods (23) being fixed to the end of the rotating drum (21), a clamping block (26) being fixed to the telescopic end of the spring telescopic rod (23), the clamping block (26) being slidably connected to the rotating drum (21) and the end of the clamping block (26) extending into the interior of the turning groove (24), and a guide plate (25) being arranged obliquely is fixed to one end of the clamping block (26).

6. A solar cell flipping device according to claim 5, characterized in that: The driving mechanism (3) comprises a mounting frame (32), a stepper motor (31) is fixed to the mounting frame (32), a gear 1 (33) is fixed to the output shaft of the stepper motor (31), a gear 2 (34) is fixed to the end of the rotating shaft (22), and the gear 2 (34) is meshingly connected with the gear 1 (33).

7. The solar cell flipping device according to claim 1, characterized in that: The fixed frame (1) is equipped with an introduction mechanism (6), the introduction mechanism (6) comprising a support rod (63), the support rod (63) is fixed to one side of the fixed frame (1), a support plate (61) is fixed to the upper end of the support rod (63), two guide plates (62) in a V-shaped structure are fixed to the upper end of the support plate (61), a mounting rod (65) is fixed to one side of the fixed frame (1), a discharge plate (64) is fixed to the upper end of the mounting rod (65), and the rotating drum (21) is located between the support plate (61) and the discharge plate (64).

8. The solar cell flipping device according to claim 1, characterized in that: A buffer block (67) is slidably connected to one side of the rotating drum (21); a spring (66) is fixed between the end of the buffer block (67) and the rotating drum (21); the other end of the buffer block (67) extends into the interior of the flip groove (24); and the movement of the buffer block (67) is in an arc-shaped structure.

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