A reverse three-stage water washing system for meta-aramid fiber spinning section

Abstract

The invention discloses a reverse three-stage water washing system for a meta-aramid fiber spinning section, comprising a machine body, an overflow plate is vertically arranged at the top of the inner wall of the machine body, an overflow trough is opened at the top of the overflow plate, a transmission roller is arranged in the washing trough on the inner wall of the machine body, a transition roller is arranged above the overflow plate on the inner wall of the machine body, the transition roller and the transmission roller are connected by a first transmission belt, an intermittent feeding assembly is arranged on the outer wall of the machine body, and a solution replacement assembly is arranged on the inner wall of the machine body; a cylinder is arranged at the top of the machine body, a telescopic rod is arranged at the output end of the cylinder, a connecting frame is arranged at the bottom end of the telescopic rod, a spring is sleeved on the telescopic rod, and a squeezing roller is rotatably connected to the connecting frame. The invention overcomes the shortcomings of the prior art, has a reasonable design, and performs multiple replacements by squeezing the meta-aramid fiber tow through the solvent replacement assembly, and has a high social use value and application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of meta-aramid fiber washing, and in particular to a reverse three-stage washing system for a meta-aramid fiber spinning section. Background Art

[0002] In the spinning process of meta-aramid fiber, the meta-aramid fiber spinning section needs to wash the formed filament bundle with water, and the stretched filament bundle is reversely washed with hot pure water for three stages to remove the residual solvent.

[0003] The existing three-stage water washing device generally directly draws the fiber bundle through the water washing tank in sequence. Except for setting the pulling direction of the fiber bundle opposite to the flow direction of the cleaning liquid to enhance the cleaning effect, there is no mechanism to directly accelerate the replacement of the solvent and the cleaning liquid on the fiber bundle to improve the cleaning effect. In order to improve the cleaning effect of the fiber bundle, a reverse three-stage water washing system for the meta-aramid fiber spinning section with a solution replacement component is provided. Summary of the invention

[0004] In order to solve the problems mentioned in the above background technology, the present invention provides a reverse three-stage water washing system for a meta-aramid fiber spinning section.

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

[0006] A reverse three-stage water washing system for a meta-aramid fiber spinning section comprises a machine body, an overflow plate is vertically arranged at the top of the inner wall of the machine body, an overflow groove is opened on the top of the overflow plate, a driving roller is arranged on the inner inner wall of the machine body located in the water washing groove, a transition roller is arranged on the inner inner wall of the machine body located above the overflow plate, the transition roller and the driving roller are connected by a first transmission belt, an intermittent feeding assembly is arranged on the outer outer wall of the machine body, and a solution replacement assembly is arranged on the inner wall of the machine body; a cylinder is arranged on the top of the machine body, a telescopic rod is arranged on the output end of the cylinder, a connecting frame is arranged on the bottom end of the telescopic rod, a spring is sleeved on the telescopic rod, and a water squeezing roller is rotatably connected to the connecting frame.

[0007] Furthermore, the side wall of the machine body is provided with a wire inlet and a wire outlet, the side wall of the machine body is rotatably connected to a feed guide roller at the wire inlet, and the side wall of the machine body is rotatably connected to a discharge guide roller at the wire outlet.

[0008] Furthermore, a liquid inlet pipe is provided on the side wall of the machine body, a liquid outlet pipe is provided on the side wall of the machine body, and a valve is provided on the liquid outlet pipe.

[0009] Furthermore, a slide groove is provided on the inner wall of the body, and the solution replacement assembly includes a slider slidably connected in the slide groove, a mounting plate is provided on the inner wall of the slider, a connecting plate is provided on the bottom end of the slider, a lower extrusion roller is rotatably connected to the side wall of the connecting plate, a sliding rod is provided on the bottom end of the mounting plate, a lifting plate is provided on the sliding rod, a second spring is sleeved on the bottom end of the lifting plate on the sliding rod, a sliding block is slidably connected to the sliding rod, and the upper extrusion roller is rotatably connected to the inner wall of the sliding block.

[0010] Furthermore, a first rack is provided on the inner wall of the body, a first gear is provided on the side end of the lower extrusion roller, the first gear is meshed with the first rack, a second rack is slidably connected to the inner wall of the sliding block, a second slide groove is provided on the inner wall of the body, a second slider is provided on the side end of the second rack, the second slider is slidably connected in the second slide groove, a second gear is provided on the upper extrusion roller, and the second gear is slidably connected to the second rack.

[0011] Furthermore, a third rack is provided at the top of the slider, and a third rotating shaft and a fourth rotating shaft are rotatably connected on the side wall of the body, a third gear and a first incomplete gear are provided on the third rotating shaft, a fourth gear and a second incomplete gear are provided on the fourth rotating shaft, the fourth gear and the third gear are meshingly connected, and the first incomplete gear and the second incomplete gear are alternately meshingly connected with the third rack.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The cleaning liquid is introduced into the washing tank through the liquid inlet pipe. The cleaning liquid can fill the three washing tanks through the overflow tank. The meta-aramid fiber tow enters from the inlet, passes through the transmission roller to enter the washing tank for cleaning, is guided by the transition roller, and then passes through the transmission roller to enter the next level of washing tank for cleaning. The three-level washing is completed in sequence. The flow direction of the cleaning liquid is opposite to the feeding direction of the meta-aramid fiber tow, which can improve the cleaning effect.

[0014] 2. By controlling the extension length of the cylinder, the squeezing roller and the discharge guide roller can cooperate to squeeze the cleaning liquid on the cleaned aramid fiber tow back into the washing tank, preventing the aramid fiber tow from spilling the cleaning liquid out of the outlet.

[0015] 3. The driving gear and the driven gear are meshed and connected to drive the driving rod to rotate intermittently, thereby driving the transmission roller to rotate intermittently, so as to realize intermittent feeding of the meta-aramid fiber tow, thereby realizing that the meta-aramid fiber tow stays in the washing tank, prolonging the washing time and improving the washing effect.

[0016] 4. The first incomplete gear and the second incomplete gear are alternately meshed with the third rack, thereby driving the slider to achieve reciprocating motion, driving the upper extrusion roller and the lower extrusion roller to reciprocate and extrude the meta-aramid fiber, thereby completing multiple replacements of the solvent in the meta-aramid fiber, and achieving a good cleaning effect.

[0017] In summary, the present invention overcomes the shortcomings of the prior art, has a reasonable design, and performs multiple replacements by extruding meta-aramid fiber tows through a solvent replacement component, which has high social use value and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the internal structure of the machine body of the present invention;

[0020] Figure 2 The overall structure of the present invention is shown in FIG. Figure 1 ;

[0021] Figure 3 The overall structure of the present invention is shown in FIG. Figure 2 ;

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the driving assembly of the present invention;

[0024] Figure 6 For the present invention Figure 5 A magnified view of the structure at center;

[0025] Figure 7 It is a schematic diagram of the intermittent feeding assembly structure of the present invention;

[0026] Figure 8 It is a schematic diagram of the structure of the driving turntable of the present invention;

[0027] Fig. 9 It is a schematic diagram of the structure of the solution replacement component of the present invention;

[0028] Fig.10 For the present invention Fig. 9 A magnified view of the structure at D in the middle;

[0029] Fig.11 For the present invention Figure 1 A magnified view of the structure at B in the middle;

[0030] In the figure: body 1, wire inlet 101, wire outlet 102, liquid inlet pipe 103, valve 104, liquid outlet pipe 105, feed guide roller 106, discharge guide roller 107, overflow plate 11, overflow groove 111, transmission roller 21, transition roller 22, first transmission belt 234, second transmission belt 235, discharge drainage assembly 24, cylinder 241, telescopic rod 242, spring 243, connecting frame 244, water squeezing roller 245, solution replacement assembly 3, intermittent feeding assembly 4, fixing frame 23, driving rod 231, first bevel gear 232, second bevel gear 233, driven gear 236, second connecting frame 41, worm 42, first rotating shaft 43, worm wheel 431, Driving turntable 432, roller 4321, second rotating shaft 44, intermittent turntable 441, driving gear 442, slide groove 301, slider 302, mounting plate 31, threaded rod 303, connecting plate 32, lower squeezing roller 321, sliding rod 311, lifting plate 312, second spring 313, sliding block 314, upper squeezing roller 315, first gear 331, first rack 332, second gear 316, second slide groove 3141, second slider 3142, second rack 3143, third rack 353, third rotating shaft 34, third gear 341, first incomplete gear 342, fourth rotating shaft 35, fourth gear 351, second incomplete gear 352. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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. Example 1

[0032] Reference Figure 1-11A reverse three-stage water washing system for a meta-aramid fiber spinning section includes a machine body 1, an overflow plate 11 is vertically arranged at the top of the inner wall of the machine body 1, an overflow groove 111 is opened on the top of the overflow plate 11, and the internal space of the machine body 1 can be divided into three water washing grooves by setting the overflow plate 11 to perform three-stage water washing on the meta-aramid fiber, a wire inlet 101 and a wire outlet 102 are opened on the side wall of the machine body 1, a feed guide roller 106 is rotatably connected to the wire inlet 101 on the side wall of the machine body 1, and a feed guide roller 106 is rotatably connected to the wire outlet 102 on the side wall of the machine body 1 A discharging guide roller 107 is rotatably connected, a liquid inlet pipe 103 is provided on the side wall of the body 1, a liquid outlet pipe 105 is provided on the side wall of the body 1, a valve 104 is provided on the liquid outlet pipe 105, cleaning liquid is added to the inside of the washing tank through the liquid inlet pipe 103, and flows into other cleaning tanks in sequence through the overflow tank 111, and the cleaning liquid flows out from the liquid outlet pipe 105 for replacement, and the flow direction of the cleaning liquid is opposite to the feeding direction of the meta-aramid fiber tow, so as to improve the cleaning effect, an intermittent feeding component 4 is provided on the outer wall of the body 1, and a solution replacement component 3 is provided on the inner wall of the body 1.

[0033] Furthermore, a drive roller 21 is provided on the inner wall of the machine body 1 located in the water washing tank, and a transition roller 22 is provided on the inner wall of the machine body 1 located above the overflow plate 11. The transition roller 22 and the drive roller 21 are connected to each other through a first transmission belt 234 to drive the transition roller 22 and the drive roller 21 to rotate synchronously. The drive roller 21 and the discharge guide roller 107 are connected to each other through a second transmission belt 235.

[0034] Furthermore, a cylinder 241 is provided at the top of the body 1, a telescopic rod 242 is provided at the output end of the cylinder 241, a connecting frame 244 is provided at the bottom end of the telescopic rod 242, a spring 243 is sleeved on the telescopic rod 242, and a water squeezing roller 245 is rotatably connected to the connecting frame 244. The water squeezing roller 245 cooperates with the discharge guide roller 107 to squeeze the cleaning liquid on the cleaned aramid fiber bundle back into the washing tank, so as to prevent the aramid fiber bundle from bringing the cleaning liquid out of the wire outlet 102 and spilling it, which is inconvenient to clean.

[0035] Furthermore, a fixing frame 23 is provided on the outer wall of the machine body 1, a driving rod 231 is rotatably connected to the fixing frame 23, a first bevel gear 232 is provided on the driving rod 231, a second bevel gear 233 is provided on the outer end of the transmission roller 21, the second bevel gear 233 is meshed with the first bevel gear 232, and a driven gear 236 is provided on the side end of the driving rod 231.

[0036] The cleaning liquid is introduced into the washing tank through the liquid inlet pipe 103, and the cleaning liquid can fill the three washing tanks through the overflow tank 111, and flow out from the liquid outlet pipe 105 to replace the cleaning liquid. The meta-aramid fiber tow enters from the inlet 101, passes through the transmission roller 21 to enter the washing tank for cleaning, is guided by the transition roller 22, and then passes through the transmission roller 21 to enter the next-level washing tank for cleaning, completing three-level washing in sequence. The flow direction of the cleaning liquid is opposite to the feeding direction of the meta-aramid fiber tow, which can improve the cleaning effect. By controlling the extension length of the cylinder 241, the squeezing roller 245 can cooperate with the discharge guide roller 107 to squeeze the cleaning liquid on the cleaned aramid fiber tow back into the washing tank, so as to prevent the aramid fiber tow from bringing the cleaning liquid out of the outlet 102 and spilling it. Example 2

[0037] Reference Figure 1-11 The difference between this embodiment and embodiment 1 is that the intermittent feeding component 4 includes a second connecting frame 41 on the outer wall of the body 1, and the side wall of the second connecting frame 41 is rotatably connected to the worm 42. The outer wall of the second connecting frame 41 is provided with a driving motor 45, and the output end of the driving motor 45 is fixedly connected to the worm 42. The second connecting frame 41 is rotatably connected to the first rotating shaft 43 and the second rotating shaft 44. The first rotating shaft 43 is provided with a worm wheel 431 and a driving turntable 432. The worm 42 is meshingly connected with the worm wheel 431. The second connecting frame 41 is provided with an intermittent turntable 441, and the top of the driving turntable 432 is rotatably connected to a roller 4321. The intermittent turntable 441 is provided with a driving groove at an equiangular angle, and the driving groove is rollingly connected to the roller 4321. The top of the second rotating shaft 44 is provided with a driving gear 442, and the driving gear 442 is meshingly connected with the driven gear 236.

[0038] Start the drive motor 45, and the first rotating shaft 43 can be driven to rotate through the meshing connection between the worm 42 and the worm wheel 431, and the second rotating shaft 44 can be driven to rotate intermittently through the rolling connection between the driving groove and the roller 4321, thereby driving the driving gear 442 to rotate intermittently, and the driving rod 231 can be driven to rotate intermittently through the meshing connection between the driving gear 442 and the driven gear 236, thereby driving the transmission roller 21 to rotate intermittently, thereby realizing intermittent feeding of the meta-aramid fiber tow, thereby realizing that the meta-aramid fiber tow stays in the washing tank, prolonging the washing time and improving the washing effect. Example 3

[0039] Reference Figure 1-11The difference between this embodiment and embodiment 2 is that a slide groove 301 is provided on the inner wall of the body 1, and the solution replacement component 3 includes a slider 302 slidably connected in the slide groove 301, a mounting plate 31 is provided on the inner wall of the slider 302, a connecting plate 32 is provided at the bottom end of the slider 302, a lower squeezing roller 321 is rotatably connected to the side wall of the connecting plate 32, a sliding rod 311 is provided at the bottom end of the mounting plate 31, a lifting plate 312 is provided on the sliding rod 311, and a second spring 313 is sleeved at the bottom end of the lifting plate 312 on the sliding rod 311, and the sliding plate 312 is provided on the sliding rod 311. A sliding block 314 is slidably connected to the rod 311, the bottom end of the second spring 313 is fixedly connected to the top of the sliding block 314, and the inner wall of the sliding block 314 is rotatably connected to the upper squeezing roller 315. Through the upper squeezing roller 315 and the lower squeezing roller 321, the solvent in the meta-aramid fiber bundle can be squeezed out and then the cleaning liquid is sucked in, thereby replacing the solvent in the meta-aramid fiber bundle to ensure the cleaning effect. A threaded rod 303 is rotatably connected to the mounting plate 31, and the bottom end of the threaded rod 303 is rotatably connected to the top of the lifting plate 312.

[0040] The height of the upper squeezing roller 315 can be adjusted by the threaded rod 303, thereby adjusting the pressure between the upper squeezing roller 315 and the lower squeezing roller 321, so as to squeeze out fiber bundles of different thicknesses. The slider 302 can be moved to drive the upper squeezing roller 315 and the lower squeezing roller 321 to move, so as to squeeze out the solvent in the meta-aramid fiber bundle and then suck in the cleaning liquid, so as to replace the solvent in the meta-aramid fiber bundle and ensure the cleaning effect. Example 4

[0041] Reference Figure 1-11 The difference between this embodiment and embodiment 3 is that a first rack 332 is provided on the inner wall of the body 1, a first gear 331 is provided on the side end of the lower squeezing roller 321, the first gear 331 is meshed with the first rack 332, a second rack 3143 is slidably connected to the inner wall of the sliding block 314, a second slide groove 3141 is provided on the inner wall of the body 1, a second slider 3142 is provided on the side end of the second rack 3143, the second slider 3142 is slidably connected in the second slide groove 3141, a second gear 316 is provided on the upper squeezing roller 315, the second gear 316 is slidably connected to the second rack 3143, and the second rack 3143 can be driven to follow the movement of the upper squeezing roller 315 through the sliding block 314 inner wall slidingly connected to the second rack 3143, so that the second gear 316 and the second rack 3143 are always kept meshed.

[0042] While the upper squeezing roller 315 and the lower squeezing roller 321 move to extrude and wash the meta-aramid fiber bundle, the first gear 331 is meshedly connected with the first rack 332 to drive the lower squeezing roller 321 to rotate, and the second gear 316 is meshedly connected with the second rack 3143 to drive the upper squeezing roller 315, so as to avoid the upper squeezing roller 315 and the lower squeezing roller 321 moving and squeezing the meta-aramid fiber bundle, so as not to generate tension on the meta-aramid fibers and break the meta-aramid fibers. Example 5

[0043] Reference Figure 1-11 The difference between this embodiment and embodiment 4 is that a third rack 353 is provided at the top of the slider 302, a third rotating shaft 34 and a fourth rotating shaft 35 are rotatably connected on the side wall of the body 1, a third gear 341 and a first incomplete gear 342 are provided on the third rotating shaft 34, a fourth gear 351 and a second incomplete gear 352 are provided on the fourth rotating shaft 35, the fourth gear 351 and the third gear 341 are meshed and connected, and the first incomplete gear 342 and the second incomplete gear 352 are alternately meshed and connected with the third rack 353.

[0044] The third rotating shaft 34 is driven, and the fourth rotating shaft 35 is driven to rotate through the meshing connection between the fourth gear 351 and the third gear 341, thereby driving the first incomplete gear 342 and the second incomplete gear 352 to alternately mesh with the third rack 353, thereby driving the slider 302 to achieve reciprocating motion, driving the upper squeezing roller 315 and the lower squeezing roller 321 to reciprocate and extrude the meta-aramid fiber, thereby completing multiple replacements of the solvent in the meta-aramid fiber, and achieving a good cleaning effect.

[0045] Working principle: In the present invention, the cleaning liquid is introduced into the water washing tank through the liquid inlet pipe 103, and the cleaning liquid can fill the three water washing tanks through the overflow tank 111, and flows out from the liquid outlet pipe 105 to replace the cleaning liquid. The meta-aramid fiber tow enters from the inlet 101, passes through the transmission roller 21 to enter the water washing tank for cleaning, is guided by the transition roller 22, and then passes through the transmission roller 21 to enter the next level of water washing tank for cleaning, and three levels of water washing are completed in sequence. The flow direction of the cleaning liquid is opposite to the feeding direction of the meta-aramid fiber tow;

[0046] The driving motor 45 is started, and the first rotating shaft 43 is driven to rotate by the meshing connection between the worm 42 and the worm wheel 431, and the second rotating shaft 44 is driven to rotate intermittently by the rolling connection between the driving groove and the roller 4321, thereby driving the driving gear 442 to rotate intermittently, and the driving rod 231 is driven to rotate intermittently by the meshing connection between the driving gear 442 and the driven gear 236, thereby driving the transmission roller 21 to rotate intermittently, so as to realize intermittent feeding of the meta-aramid fiber tow;

[0047] The height of the upper squeezing roller 315 can be adjusted by the threaded rod 303, thereby adjusting the pressure between the upper squeezing roller 315 and the lower squeezing roller 321, so as to achieve squeezing of fiber bundles of different thicknesses;

[0048] The third rotating shaft 34 is driven to rotate through the meshing connection between the fourth gear 351 and the third gear 341, thereby driving the first incomplete gear 342 and the second incomplete gear 352 to alternately mesh with the third rack 353, thereby driving the slider 302 to achieve reciprocating motion, driving the upper extrusion roller 315 and the lower extrusion roller 321 to reciprocate and extrude the meta-aramid fiber.

[0049] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0050] 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 reverse three-stage water washing system for a meta-aramid fiber spinning section, comprising a machine body (1), characterized in that: An overflow plate (11) is vertically provided at the top of the inner wall of the machine body (1), an overflow groove (111) is provided at the top of the overflow plate (11), a drive roller (21) is provided on the inner side wall of the machine body (1) located in the water washing groove, a transition roller (22) is provided on the inner side wall of the machine body (1) located above the overflow plate (11), the transition roller (22) and the drive roller (21) are connected to each other by a first transmission belt (234), an intermittent feeding assembly (4) is provided on the outer side wall of the machine body (1), and a solution replacement assembly (3) is provided on the inner wall of the machine body (1); A cylinder (241) is provided at the top of the machine body (1); a telescopic rod (242) is provided at the output end of the cylinder (241); a connecting frame (244) is provided at the bottom end of the telescopic rod (242); a spring (243) is sleeved on the telescopic rod (242); and a water squeezing roller (245) is rotatably connected to the connecting frame (244); The inner wall of the machine body (1) is provided with a slide groove (301), and the solution replacement component (3) comprises a slider (302) slidably connected in the slide groove (301), the inner wall of the slider (302) is provided with a mounting plate (31), the bottom end of the slider (302) is provided with a connecting plate (32), the side wall of the connecting plate (32) is rotatably connected to a lower squeezing roller (321), the bottom end of the mounting plate (31) is provided with a sliding rod (311), a lifting plate (312) is provided on the sliding rod (311), a second spring (313) is sleeved on the bottom end of the lifting plate (312) on the sliding rod (311), a sliding block (314) is slidably connected to the sliding rod (311), and the inner wall of the sliding block (314) is rotatably connected to an upper squeezing roller (315).

2. A reverse three-stage water washing system for a meta-aramid fiber spinning section according to claim 1, characterized in that: The side wall of the machine body (1) is provided with a wire inlet (101) and a wire outlet (102); a feed guide roller (106) is rotatably connected to the wire inlet (101) of the side wall of the machine body (1); and a discharge guide roller (107) is rotatably connected to the wire outlet (102) of the side wall of the machine body (1).

3. A reverse three-stage water washing system for a meta-aramid fiber spinning section according to claim 1, characterized in that: The side wall of the machine body (1) is provided with a liquid inlet pipe (103), the side wall of the machine body (1) is provided with a liquid outlet pipe (105), and the liquid outlet pipe (105) is provided with a valve (104).

4. A reverse three-stage water washing system for a meta-aramid fiber spinning section according to claim 1, characterized in that: The inner wall of the machine body (1) is provided with a first rack (332), the side end of the lower squeezing roller (321) is provided with a first gear (331), the first gear (331) is meshedly connected with the first rack (332), the inner wall of the sliding block (314) is slidably connected with a second rack (3143), the inner wall of the machine body (1) is provided with a second slide groove (3141), the side end of the second rack (3143) is provided with a second slider (3142), the second slider (3142) is slidably connected in the second slide groove (3141), the upper squeezing roller (315) is provided with a second gear (316), the second gear (316) is slidably connected with the second rack (3143).

5. The reverse three-stage water washing system for the meta-aramid fiber spinning section according to claim 1, characterized in that: A third rack (353) is provided at the top of the slider (302); a third rotating shaft (34) and a fourth rotating shaft (35) are rotatably connected on the side wall of the body (1); a third gear (341) and a first incomplete gear (342) are provided on the third rotating shaft (34); a fourth gear (351) and a second incomplete gear (352) are provided on the fourth rotating shaft (35); the fourth gear (351) and the third gear (341) are meshedly connected; the first incomplete gear (342) and the second incomplete gear (352) are alternately meshedly connected with the third rack (353).

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