A device for processing the front surface of an XBC solar cell to prevent scratching

Abstract

The application discloses a kind of XBC solar cell front anti-scratch processing device, including conveying device and printing glue device, slidingly arranged with the leveling bar on conveying device, further including sliding frame, fixedly arranged with horizontal bar on sliding frame, the horizontal position of battery piece is corrected by horizontal bar through sliding, fixedly arranged with guide rod on horizontal bar, slidingly and rotatably arranged with longitudinal bar on guide rod, the longitudinal position of battery piece is corrected by longitudinal bar through sliding after rotating;Printing glue device is arranged above conveying device, and the front of battery piece is printed with glue at multiple points, support points are formed by printing glue, to avoid the front of battery piece from contacting other objects during production process, prevent it from being scratched, improve the yield of battery piece production, leveling bar is arranged simultaneously, to avoid excessive height difference in the height of multiple point printing glue, to avoid the phenomenon of inclination when battery piece is stacked.

Description

Technical Field

[0001] This invention relates to the field of solar cell technology, and more specifically to a device for preventing scratches on the front side of an XBC solar cell. Background Technology

[0002] Solar photovoltaic (PV) power generation will become one of the important energy sources in the future. With the continuous increase in global energy demand, the importance of solar PV power generation will continue to grow. XBC cells, with their back-contact cell structure, feature no front electrode obstruction, high conversion efficiency, and aesthetically pleasing module appearance, making them suitable for various applications such as BIPV (Building Integrated Photovoltaics) and CIPV (Vehicle Integrated Photovoltaics). They possess significant development potential and a broad market prospect.

[0003] Traditional back-contact batteries have a coated front surface without metal electrodes. Furthermore, the glass contact cells used for solar cell performance testing are prone to attracting dirt from the glass surface, which not only makes the cells look unsightly but also affects the conversion efficiency of XBC batteries.

[0004] Currently, the front side of XBC solar cells is composed of a composite passivation antireflection film made of Al2O3 and SiNx / SiONx / SiOx. Since there are no printed metal grid lines on the front surface, the front surface must be attracted by a suction cup during IV testing to achieve cell movement. In addition, during testing, the back side of the cell contains the positive and negative electrodes and needs to be lifted by the probe. Therefore, the front surface of the cell will also be attracted and fixed by high-transmittance glass. As a result, the front surface of the cell is also prone to being stuck with particles and dirt on the glass, resulting in abnormal appearance. Furthermore, when the cells are packaged and placed in boxes, they are stacked together. This means that the front of the cell can be scratched by the back of the previous cell, resulting in poor appearance. Summary of the Invention

[0005] The purpose of this invention is to provide a scratch-resistant treatment device for the front side of XBC solar cells to overcome the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A scratch-resistant treatment device for the front side of an XBC solar cell includes a conveying device and an adhesive printing device. A smoothing rod is slidably mounted on the conveying device, and a bolt is rotatably mounted on the conveying device. The bolt is threadedly connected to the smoothing rod.

[0008] It also includes a sliding frame, on which a transverse rod is fixedly installed. The transverse rod corrects the transverse position of the battery cell by sliding. A guide rod is fixedly installed on the transverse rod. A longitudinal rod is slidably and rotatably installed on the guide rod. The longitudinal rod corrects the longitudinal position of the battery cell by rotating and then sliding.

[0009] It also includes a switching component, which is used to fix the position of the transverse rod after the transverse rod corrects the transverse position of the battery cell, and drive the longitudinal rod to correct the longitudinal position of the battery cell.

[0010] Preferably, the guide rod is provided with a guide groove, and the longitudinal rod is fixedly provided with a guide block, which is slidably disposed in the guide groove;

[0011] The guide groove includes a spiral section and a straight section.

[0012] Preferably, the switching assembly includes a reciprocating tube slidably disposed on a sliding frame, a rotating tube rotatably disposed on the longitudinal rod, a straight rod fixedly disposed on the rotating block, and a connecting member disposed between the reciprocating tube and the straight rod.

[0013] Preferably, the connector includes a first connecting rope and a second connecting rope, one end of the first connecting rope is fixedly connected to one end of the second connecting rope, the other end of the first connecting rope is fixedly connected to a straight rod, and the other end of the second connecting rope is fixedly connected to a reciprocating tube.

[0014] Preferably, a second spring is provided between the rotating tube and the transverse rod, and the two ends of the second spring are fixedly connected to the rotating tube and the transverse rod, respectively.

[0015] Preferably, a limiting pin is slidably provided on the sliding frame, and a limiting groove is provided on the reciprocating tube. Both the limiting pin and the limiting groove are provided with inclined surfaces and are engaged in a locking fit.

[0016] Preferably, a fixed plate is fixedly installed on the conveying device, and an adjusting rod is rotatably installed on the fixed plate, with the limiting pin abutting against the adjusting rod.

[0017] Preferably, the adjusting rod is provided with multiple locking slots, and the multiple locking slots are arranged in an equidistant circle, and the multiple locking slots are engaged with the limiting pins.

[0018] Preferably, a plurality of first springs are provided between the limiting pin and the sliding frame, and the two ends of the first springs are fixedly connected to the limiting pin and the sliding frame, respectively.

[0019] Preferably, a motor is fixedly mounted on the fixed plate, and a bidirectional lead screw is fixedly mounted on the output shaft of the motor. Different threads on both sides of the bidirectional lead screw are respectively connected to two reciprocating pipe threads.

[0020] In the above technical solution, the scratch-resistant treatment device for the front side of an XBC solar cell provided by the present invention has the following beneficial effects:

[0021] 1. An adhesive printing device is installed above the conveying device to print adhesive at multiple points on the front of the battery cell. The adhesive printing forms support points to prevent the front of the battery cell from coming into contact with other objects during the production process, thus preventing scratches and improving the yield rate of battery cell production. At the same time, a smoothing rod is installed to avoid excessive height differences between the adhesive printing points, thus preventing the battery cells from tilting when stacked.

[0022] 2. By setting horizontal and vertical rods, and by switching components, after the horizontal rod corrects the lateral position of the battery cell, it adaptively switches to allow the vertical rod to rotate and slide, thereby correcting the longitudinal position of the battery cell and improving the accuracy of the printing position of the battery cell.

[0023] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0024] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0026] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the sliding frame structure provided in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the internal structure of the transverse bar provided in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the guide rod and longitudinal rod structure provided in an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the smoothing rod structure provided in an embodiment of the present invention;

[0031] Figure 6 Front cross-sectional view and partial enlarged view of the limiting pin and sliding frame provided in the embodiments of the present invention;

[0032] Figure 7 This is a schematic diagram of the adjusting rod structure provided in an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the printing points on the battery cell provided in an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Conveying device; 11. Fixing plate; 2. Smoothing rod; 21. Bolt; 3. Sliding frame; 31. Horizontal rod; 32. Limiting pin; 33. First spring; 4. Guide rod; 41. Spiral part; 42. Straight part; 5. Longitudinal rod; 51. Guide block; 52. Rotating tube; 53. Straight rod; 54. First connecting rope; 55. Second spring; 6. Reciprocating tube; 61. Second connecting rope; 62. Limiting groove; 7. Adjusting rod; 71. Snap-fit ​​groove; 8. Bidirectional lead screw; 81. Motor. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0037] Please refer to 1-8. A scratch-resistant treatment device for the front side of an XBC solar cell includes a conveying device 1 and an adhesive printing device. A smoothing rod 2 is slidably mounted on the conveying device 1, and a bolt 21 is rotatably mounted on the conveying device 1, with the bolt 21 threadedly connected to the smoothing rod 2. The device also includes a sliding frame 3, on which a transverse rod 31 is fixedly mounted. The transverse rod 31 corrects the lateral position of the solar cell by sliding. A guide rod 4 is fixedly mounted on the transverse rod 31, and a longitudinal rod 5 is slidably and rotatably mounted on the guide rod 4. The longitudinal rod 5 slides after rotation. The system includes a longitudinal positioning correction mechanism for the solar cells; it also includes a switching component, which, after the transverse rod 31 corrects the transverse position of the solar cells, fixes the position of the transverse rod 31 and drives the longitudinal rod 5 to correct the longitudinal position of the solar cells. The printing adhesive is positioned above the conveying device 1. As the solar cells pass through the conveying device 1, the printing adhesive is applied to five points on the front of the solar cells. The support of these printing points prevents other objects from contacting the front of the solar cells during subsequent processes and stacking, thus avoiding appearance problems and improving efficiency. The yield rate of solar cells; after the solar cells are printed with adhesive, the conveying device transports the solar cells. During the transport process, when the solar cells pass through the smoothing rod 2, the smoothing rod 2 contacts the adhesive, controlling the height of the adhesive at five points to reduce the height difference of the adhesive at each point after solidification, thus preventing tilting of the solar cells when they are stacked due to the different heights of the adhesive at each point; after the solar cells are transported to the printing position, the position of the solar cells is corrected by the sliding horizontal rod 31 and the rotating and then sliding vertical rod 5 to prevent the printing points from shifting. By switching components, the transverse rod 31 slides to first correct the transverse position of the battery cell, so that the battery cell is located in the middle position of the conveying device 1. Then, by switching components, the longitudinal rod 5 rotates to be parallel to the battery cell and slides to correct the longitudinal position of the battery cell. The rotation of the longitudinal rod 5 also ensures that it does not obstruct the conveying path of the battery cell. The transverse and longitudinal positions mentioned in this invention refer to the long and short sides of the battery cell. The movement of the battery cell is completed by moving the four sides of the battery cell, thereby completing the correction of the battery cell position.

[0038] Specifically, a guide groove is provided on the guide rod 4, and a guide block 51 is fixedly provided on the longitudinal rod 5. The guide block 51 is slidably disposed in the guide groove. The guide groove includes a spiral part 41 and a straight part 42. After the transverse rod 31 corrects the transverse position of the battery cell, the longitudinal rod 5 slides on the guide rod 4. During the sliding process, the guide block 51 cooperates with the spiral part 41 of the guide groove, so that the longitudinal rod 5 first rotates to a position parallel to the longitudinal edge of the battery cell. Then, the guide block 51 enters the straight part 42, so that the longitudinal rod 5 slides stably and corrects the longitudinal position of the battery cell.

[0039] In a further embodiment of the present invention, the switching component includes a reciprocating tube 6 slidably disposed on the sliding frame 3, a rotating tube 52 rotatably disposed on the longitudinal rod 5, a straight rod 53 fixedly disposed on the rotating block, and a connecting member disposed between the reciprocating tube 6 and the straight rod 53. The sliding frame 3 is driven to slide through the reciprocating tube 6, so that the transverse rod 31 corrects the transverse position of the battery cell. After the transverse position is corrected, the sliding frame 3 is limited, and the reciprocating tube 6 continues to slide, so that the reciprocating tube 6 drives the longitudinal rod 5 to slide through the connecting member, so that the longitudinal rod 5 corrects the longitudinal position of the battery cell.

[0040] Furthermore, the connector includes a first connecting rope 54 and a second connecting rope 61. One end of the first connecting rope 54 is fixedly connected to one end of the second connecting rope 61, and the other end of the first connecting rope 54 is fixedly connected to the straight rod 53. The other end of the second connecting rope 61 is fixedly connected to the reciprocating tube 6. By setting the connector to the first connecting rope 54 and the second connecting rope 61, after the sliding frame 3 is limited, the reciprocating tube 6 continues to slide. By pulling the second connecting rope 61, the second connecting rope 61 pulls the two first connecting ropes 54 corresponding to the two longitudinal rods 5, causing the longitudinal rods 5 to rotate and slide, thereby completing the correction of the longitudinal position of the battery cell by the longitudinal rods 5.

[0041] Furthermore, a second spring 55 is provided between the rotating tube 52 and the transverse rod 31. The two ends of the second spring 55 are fixedly connected to the rotating tube 52 and the transverse rod 31, respectively. After the transverse rod 31 corrects the transverse position of the battery cell, the sliding frame 3 is limited. The reciprocating tube 6 continues to slide and pulls the first connecting rope 54 through the second connecting rope 61. When the longitudinal rod 5 is moved by the straight rod 53 to pull the rotating tube 52, the second spring 55 is compressed, thus completing the correction of the longitudinal position of the battery cell. After the correction is completed, when the reciprocating tube 6 returns to its original position and the second connecting rope 61 is released, the longitudinal rod 5 slides back to its original position due to the rebound force of the second spring 55.

[0042] In a further embodiment of the present invention, a limiting pin 32 is slidably provided on the sliding frame 3, and a limiting groove 62 is provided on the reciprocating tube 6. Both the limiting pin 32 and the limiting groove 62 are provided with inclined surfaces and are engaged. When the sliding frame 3 slides with the transverse rod 31, the limiting pin 32 and the limiting groove 62 are engaged, so that the sliding frame 3 can drive the transverse rod 31 to slide. After the sliding frame 3 and the transverse rod 31 have corrected the transverse position of the battery cell, the limiting pin 32 and the limiting groove 62 are disengaged due to the squeezing action of the inclined surfaces. At this time, the reciprocating tube 6 can slide relative to the sliding frame 3 and pull the second connecting rope 61, so that the longitudinal rod 5 completes the correction of the longitudinal position of the battery cell.

[0043] In the embodiment provided by the present invention, a fixed plate 11 is fixedly installed on the conveying device 1, and an adjusting rod 7 is rotatably installed on the fixed plate 11. The limiting pin 32 abuts against the adjusting rod 7. When the transverse rod 31 does not correct the battery cell, the reciprocating tube 6 slides with the sliding frame 3 and the transverse rod 31. The limiting pin 32 engages with the limiting groove 62, and the lower end of the limiting pin 32 abuts against the adjusting rod 7. Therefore, even if the limiting groove 62 and the limiting pin 32 are under pressure by the inclined surface at this time, they will not disengage. In this way, the reciprocating tube 6 can drive the sliding frame 3 and the transverse rod 31 to slide through the limiting pin 32.

[0044] Specifically, the adjusting rod 7 is provided with multiple snap-fit ​​slots 71, which are arranged equidistantly in a circle. These slots engage with the limiting pin 32. Multiple first springs 33 are provided between the limiting pin 32 and the sliding frame 3. The two ends of each first spring 33 are fixedly connected to the limiting pin 32 and the sliding frame 3, respectively. When aligning the battery cells, the distance the reciprocating tube 6 slides with the sliding frame 3 can be adjusted by rotating the adjusting rod 7 to accommodate various battery cell specifications. The reciprocating tube 6 slides with the transverse rod 31 to the limit position. When pin 32 is in position with the locking groove 71, the first spring 33 is compressed under the squeezing action of the inclined surface, and the limiting pin 32 engages with the locking groove 71 and disengages from the limiting groove 62, causing the reciprocating tube 6 to continue sliding, so that the longitudinal rod 5 corrects the battery cell. During the sliding process, the reciprocating tube 6 abuts against the top of the limiting pin 32. Through the engagement of the limiting pin 32 with the locking groove 71, the sliding frame 3 and the transverse rod 31 are limited, preventing the transverse position of the battery cell from shifting when the longitudinal rod 5 corrects the battery cell.

[0045] In a further embodiment of the present invention, a motor 81 is fixedly mounted on a fixed plate 11, and a bidirectional lead screw 8 is fixedly mounted on the output shaft of the motor 81. The different threads on both sides of the bidirectional lead screw 8 are respectively threaded to two reciprocating tubes 6. The motor 81 drives the bidirectional lead screw 8 to rotate, thereby completing the sliding and resetting of the reciprocating tubes 6 and realizing the correction of the battery cell in the lateral and longitudinal directions.

[0046] The longitudinal rod 5 mentioned in this invention slides by cooperating with the spiral part 41 and the straight part 42 through the guide block 51 during the sliding process. When the guide block 51 is located in the position of the spiral part 41, the longitudinal rod 5 rotates during the sliding process. When the guide block 51 is located in the position of the straight part 42, the longitudinal rod 5 only slides. The printing device mentioned is prior art. Its implementation method and the resulting technical effect are well known attempts and conventional technical means in the field, and will not be described in detail.

[0047] Working Principle: During the printing process of the battery cell, the conveyor device 1 moves the battery cell to a position below the printing device. Then, the motor 81 starts, driving the bidirectional lead screw 8 to rotate. This causes the reciprocating tubes 6 on both sides to slide along the sliding frame 3 and the transverse rod 31, correcting the lateral position of the battery cell. When the battery cell is aligned to the center of the conveyor device 1, the limiting pin 32 moves to the corresponding locking groove 71 on the adjusting rod 7. At this time, the bidirectional lead screw 8 continues to rotate, and the reciprocating tube 6 slides. Under the action of the inclined surface of the limiting groove 62 on the reciprocating tube 6, the limiting pin 32 is pushed to slide and disengage from the limiting groove 62. Simultaneously, the other end of the limiting pin 32 engages with the locking groove 71. After engagement, the reciprocating tube 6 continues to slide. At this time, under the action of the reciprocating tube 6 abutting against the upper part of the limiting pin 32, the limiting pin 32 engages with the locking groove 71. The sliding frame 3 and the transverse rod 31 remain fixed. The reciprocating tube 6 continues to slide, pulling the second connecting rope 61, and... The second connecting rope 61 pulls the two abutting connecting ropes, which in turn pull the rotating tube 52 through the straight rod 53, causing the longitudinal rod 5 to slide. During the sliding process, the longitudinal rod 5 rotates under the action of the guide block 51 and the spiral part 41 of the guide groove until it rotates to be parallel to the longitudinal edge of the battery cell. At this time, the guide block 51 is located at the connection position of the spiral part 41 and the straight part 42. Then, the reciprocating tube 6 continues to slide. Under the action of the guide block 51 and the straight part 42, the longitudinal rod 5 slides to correct the position of the longitudinal edge of the battery cell. After the correction is completed, the printing device above prints the adhesive at five points on the battery cell. After the printing is completed, the conveying device 1 continues to convey the battery cell. During the conveying process, the printing adhesive at each point is smoothed to the same height by the smoothing rod 2 set on the conveying device 1, so that the printing adhesive is more stable when the battery cells are stacked after solidification, and the phenomenon of the battery cells tilting during the stacking process is avoided.

[0048] After the horizontal rod 31 and the vertical rod 5 correct the position of the battery cell, the printing device can reverse the bidirectional lead screw 8 during the printing process, causing the reciprocating tube 6 to slide in the opposite direction and reset. During the reset process of the reciprocating tube 6, the second connecting rope 61 and the first connecting rope 54 are loosened. Under the action of the second spring 55, the rotating tube 52 carries the vertical rod 5 to slide and reset. During the reset process, under the action of the straight part 42 and the guide block 51, the vertical rod 5 first slides and disengages from the battery cell. After the guide block 51 moves to the position of the spiral part 41, the second spring 55 continues to reset and push the vertical rod 5, causing the vertical rod 5 to slide during the process. The reciprocating tube 6 rotates upwards to reset, so that after the battery cells are printed, the conveying device 1 can transport the battery cells. After the longitudinal rod 5 is reset, the reciprocating tube 6 slides back to the position corresponding to the limiting groove 62 and the limiting pin 32. Under the action of the first spring 33, the limiting pin 32 moves upwards and engages with the limiting groove 62, and disengages from the engaging groove 71. At this time, the reciprocating tube 6 continues to slide. Because the limiting groove 62 and the limiting pin 32 will not have inclined contact during the reset process, after the other end of the limiting pin 32 disengages from the engaging groove 71, it abuts against the adjusting rod 7, so that the reciprocating tube 6 can be reset by carrying the sliding frame 3 through the limiting pin 32. In this way, the reset of the transverse rod 31 is completed.

[0049] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A device for processing the front side of an XBC solar cell against scratching, comprising a conveying device (1) and a glue printing device, characterized in that, The conveying device (1) is slidably provided with a smoothing rod (2), and the conveying device (1) is rotatably provided with a bolt (21), which is in threaded connection with the smoothing rod (2); Further comprising a sliding frame (3), the sliding frame (3) is fixedly provided with a transverse rod (31), the transverse rod (31) corrects the transverse position of the battery piece through sliding, the transverse rod (31) is fixedly provided with a guide rod (4), the guide rod (4) is slidably and rotatably provided with a longitudinal rod (5), the longitudinal rod (5) corrects the longitudinal position of the battery piece through sliding after rotation. Further comprising a switching assembly, which is used for fixing the position of the transverse rod (31) after the transverse rod (31) corrects the transverse position of the battery piece, and driving the longitudinal rod (5) to correct the longitudinal position of the battery piece.

2. The XBC solar cell front side scratch-proof processing device according to claim 1, characterized in that, The guide rod (4) is provided with a guide groove, and the longitudinal rod (5) is fixedly provided with a guide block (51) which is slidably arranged in the guide groove. The guide groove comprises a spiral part (41) and a flat part (42).

3. The XBC solar cell front side scratch-proofing device according to claim 1, wherein, The switching assembly comprises a reciprocating pipe (6) which is slidably arranged on the sliding frame (3), the longitudinal rod (5) is rotatably provided with a rotating pipe (52), the rotating pipe (52) is fixedly provided with a straight rod (53), and the reciprocating pipe (6) and the straight rod (53) are provided with a connecting piece therebetween.

4. The XBC solar cell front side scratch-proofing device according to claim 3, wherein, The connecting piece comprises a first connecting rope (54) and a second connecting rope (61), one end of the first connecting rope (54) is fixedly connected with one end of the second connecting rope (61), the other end of the first connecting rope (54) is fixedly connected with the straight rod (53), and the other end of the second connecting rope (61) is fixedly connected with the reciprocating pipe (6).

5. The XBC solar cell front side scratch-proofing device according to claim 3, wherein, The second spring (55) is fixedly connected with the rotating pipe (52) and the transverse rod (31) at both ends thereof.

6. The XBC solar cell front side scratch-proofing processing apparatus according to claim 3, wherein The sliding frame (3) is slidably provided with a limiting pin (32), the reciprocating pipe (6) is provided with a limiting groove (62), and the limiting pin (32) and the limiting groove (62) are provided with inclined surfaces and are in clamping cooperation.

7. The XBC solar cell front side scratch-proofing device according to claim 6, wherein, The conveying device (1) is fixedly provided with a fixed plate (11), the fixed plate (11) is rotatably provided with an adjusting rod (7), and the limiting pin (32) is in abutting cooperation with the adjusting rod (7).

8. The XBC solar cell front side scratch-proofing device according to claim 7, wherein, The adjusting rod (7) is provided with a plurality of clamping grooves (71) which are equidistantly and circumferentially arranged, and the clamping grooves (71) are in clamping cooperation with the limiting pin (32).

9. The XBC solar cell front side scratch-proofing device of claim 6, wherein, A plurality of first springs (33) are arranged between the limiting pin (32) and the sliding frame (3), and the first springs (33) are fixedly connected with the limiting pin (32) and the sliding frame (3) at both ends thereof.

10. The XBC solar cell front side scratch-proofing processing apparatus according to claim 7, wherein The fixed plate (11) is fixedly provided with a motor (81), a bidirectional screw rod (8) is fixedly arranged on an output shaft of the motor (81), and the bidirectional screw rod (8) is in threaded connection with two reciprocating pipes (6) at different threads on both sides thereof.

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