Farmland low-pressure pipeline irrigation device

Abstract

The utility model relates to the technical field of farmland irrigation, in particular to a farmland low-pressure pipeline irrigation device which comprises a water outlet pipe, a water flow adjusting mechanism is arranged on the water outlet pipe, and the water flow adjusting mechanism comprises a bubbler and a connecting assembly. The bubbler is arranged on the water outlet pipe through the connecting assembly. The water spraying device has the effect of reducing water splashing.

Description

Technical Field

[0001] This application relates to the technical field of farmland irrigation, and particularly to a low-pressure pipeline irrigation device for farmland. Background Art

[0002] Farmland irrigation refers to the rational utilization of natural resources. The low-pressure pipeline irrigation method means that water is transported from the source to the irrigation area through a low-pressure water pump, and then distributed to each irrigation point through low-pressure pipelines to achieve irrigation of crops.

[0003] Currently, a low-pressure pipeline irrigation device for farmland includes a water outlet pipe connected to the low-pressure pipeline, and water finally flows out of the water outlet pipe.

[0004] When water flows out of the water outlet pipe, it will cause water splashing, which affects irrigation. Utility Model Content

[0005] In order to reduce water splashing, this application provides a low-pressure pipeline irrigation device for farmland.

[0006] A low-pressure pipeline irrigation device for farmland provided by this application adopts the following technical solution:

[0007] A low-pressure pipeline irrigation device for farmland includes a water outlet pipe, and a water flow adjustment mechanism is arranged on the water outlet pipe. The water flow adjustment mechanism includes a bubbler and a connection assembly, and the bubbler is arranged on the water outlet pipe through the connection assembly.

[0008] By adopting the above technical solution, the bubbler is connected to the water outlet block through the connection assembly; when water flows from the water outlet pipe into the bubbler, the bubbler will soften the water flow, achieving the elimination or reduction of the phenomenon of water splashing. Moreover, the bubbler can fully mix the flowing water and air. With the addition of air, the scouring force of the water is increased a lot, thereby effectively reducing the water consumption and saving water; therefore, the water flow adjustment mechanism set in this application can not only soften the water flow, achieve the elimination or reduction of water splashing, but also save the water resources for the overall irrigation.

[0009] Optionally, the connection assembly includes a first connection pipe and a second connection pipe. The first connection pipe is arranged on the bubbler, and a threaded hole is opened on the first connection pipe; the second connection pipe is arranged on the water outlet pipe, and an external thread that is threadedly connected to the threaded hole is arranged on the second connection pipe.

[0010] By adopting the above technical solution, first threadedly connect the threaded hole on the first connection pipe and the external thread on the second connection pipe. When the end of the first connection pipe away from the bubbler abuts against the water outlet pipe, the threaded hole on the first connection pipe and the external thread on the second connection pipe are completely threadedly connected together, thereby realizing the fixation of the bubbler on the water outlet pipe.

[0011] Optionally, a reinforcement mechanism is further included. The reinforcement mechanism includes a reinforcement sleeve and a hose clamp. One end of the reinforcement sleeve is arranged on the first connecting pipe, and one end of the water outlet pipe close to the second connecting pipe is located on the reinforcement sleeve; a first limiting groove for placing the hose clamp is formed in the reinforcement sleeve, and a second limiting groove for placing the hose clamp and a part of the reinforcement sleeve is formed in the water outlet pipe.

[0012] By adopting the above technical solution, when one end of the first connecting pipe far from the bubbler abuts against the water outlet pipe, one end of the water outlet pipe close to the second connecting pipe is located in the reinforcement sleeve, and the first limiting groove on the fixing sleeve corresponds to the second limiting groove on the water outlet pipe; then the hose clamp located in the first limiting groove is adjusted, and the hose clamp will tighten the fixing sleeve, so that the hose clamp and a part of the fixing sleeve can be located in the second limiting groove of the water outlet pipe; the arranged reinforcement mechanism can improve the stability when the first connecting pipe and the second connecting pipe are connected.

[0013] Optionally, a protection mechanism is further included. The protection mechanism includes a first fixing block, a second fixing block, a third fixing block, a first rotating shaft and a locking assembly. The first rotating shaft is rotatably arranged on the first fixing block, and the second fixing block is arranged on the first rotating shaft; the third fixing block is arranged on one side of the second fixing block far from the first rotating shaft, and a fixing groove for clamping with the third fixing block is formed in the first fixing block; the locking assembly is arranged on the first fixing block and is connected with the third fixing block; one end of the first fixing block abuts against the water outlet pipe and the other end abuts against the first connecting pipe; one end of the second fixing block abuts against the water outlet pipe and the other end abuts against the first connecting pipe.

[0014] By adopting the above technical solution, first, one end of the water outlet pipe close to the bubbler and one end of the bubbler close to the water outlet pipe are both placed on the first fixing block, and then the second fixing block is rotated to make the second fixing block abut against the water outlet pipe and the bubbler located on the first fixing block; at this time, the third fixing block is clamped with the fixing groove on the first fixing block, and then the third fixing block is limited in the fixing groove by the locking assembly; the arranged protection mechanism can reduce the phenomenon that the bubbler is separated from the water outlet pipe due to accidental collision, so that the water outlet pipe and the bubbler can be better connected together.

[0015] Optionally, the locking assembly includes a locking block, an adjusting shaft, an adjusting gear and an adjusting rack. A cavity communicating with the fixing groove is formed in the first fixing block, the locking block is slidably arranged in the cavity, and a locking groove for clamping with the locking block is formed in the third fixing block; the adjusting shaft is rotatably arranged on the first fixing block, the adjusting gear is key-connected to the adjusting shaft; the adjusting rack is arranged on the locking block and meshes with the adjusting gear.

[0016] By adopting the above technical solution, when the adjustment shaft is rotated, the adjustment gear on the adjustment shaft drives the adjustment rack to move, and the adjustment gear will drive the locking block to move towards the third fixed block, so that the locking block is clamped with the locking groove on the third fixed block.

[0017] Optionally, it further includes a positioning mechanism. The positioning mechanism includes a first positioning block and a second positioning block. The first positioning block is arranged on the water outlet pipe, and the second positioning block is arranged on the first connecting pipe. The first fixing block and the second fixing block are both provided with a first positioning groove for clamping with the first positioning block and a second positioning groove for clamping with the second positioning block.

[0018] By adopting the above technical solution, first, a part of the first positioning block on the water outlet pipe is placed in the first positioning groove of the first fixing block, and a part of the second positioning block on the first connecting pipe is placed in the second positioning groove of the first fixing block. One end of the water outlet pipe close to the bubbler and one end of the bubbler close to the water outlet pipe are both placed on the first fixing block; then the second fixing block is rotated so that the side of the first positioning block away from the first fixing block enters the first positioning groove of the second fixing block, and the side of the second positioning block away from the first fixing block enters the second positioning groove of the second fixing block. One end of the water outlet pipe close to the bubbler and one end of the bubbler close to the water outlet pipe can abut against the second fixing block; therefore, the provided positioning mechanism can limit the positions of the water outlet pipe and the bubbler on the first fixing block and the second fixing block, so as to better clamp the water outlet pipe and the bubbler by the first fixing block and the second fixing block.

[0019] Optionally, a covering mechanism is arranged on the first fixing block. The covering mechanism includes an extension block, a second rotating shaft, a covering plate and a driving component. The extension block is arranged on the first fixing block, the second rotating shaft is rotatably arranged on the extension block, the covering plate is arranged on the second rotating shaft, and the covering plate can abut against the side of the bubbler away from the water outlet pipe; the driving component is arranged on the extension block and is connected to the second rotating shaft.

[0020] By adopting the above technical solution, when irrigation is not required, the driving component is started, the second rotating shaft driven by the driving component rotates, and the second rotating shaft drives the covering plate to rotate, so that the covering plate abuts against one end of the bubbler away from the first connecting pipe; therefore, the provided covering mechanism can reduce the phenomenon that soil or impurities enter the bubbler and cause the bubbler to be blocked when irrigation is not required.

[0021] Optionally, the driving component includes a driving motor, a driving gear and a driven gear. The driving motor is arranged on the extension block, and the driving gear is key-connected to the output shaft of the driving motor; the driven gear is key-connected to the second rotating shaft and meshes with the driving gear.

[0022] By adopting the above technical solution, when the driving motor is started, the output shaft of the driving motor drives the driving gear to rotate, and the driven gear meshing with the driving gear will drive the second rotating shaft to rotate.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The provided water flow adjustment mechanism can not only soften the water flow to eliminate or reduce water splash, but also save the water resources for the overall irrigation;

[0025] 2. The provided covering mechanism can reduce the phenomenon that soil or impurities enter the bubbler and cause the bubbler to be blocked when irrigation is not required. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the low-pressure pipeline irrigation device for farmland in the embodiment of the present application;

[0027] Figure 2 It is a schematic structural diagram of the first positioning groove in the embodiment of the present application;

[0028] Figure 3 It is a schematic structural diagram of the reinforcement mechanism in the embodiment of the present application;

[0029] Figure 4 It is a schematic structural diagram of the threaded hole in the embodiment of the present application;

[0030] Figure 5 It is a schematic structural diagram of the locking assembly in the embodiment of the present application;

[0031] Figure 6 It is a schematic structural diagram of the covering mechanism in the embodiment of the present application.

[0032] Reference numerals: 1, water outlet pipe; 11, second limiting groove; 2, water flow adjustment mechanism; 21, bubbler; 22, connection assembly; 221, first connecting pipe; 2211, threaded hole; 222, second connecting pipe; 3, reinforcement mechanism; 31, reinforcement sleeve; 311, first limiting groove; 32, hose clamp; 4, protection mechanism; 41, first fixing block; 411, fixing groove; 42, second fixing block; 421, placing groove; 422, first positioning groove; 423, second positioning groove; 43, third fixing block; 44, locking assembly; 441, locking block; 442, adjusting shaft; 443, adjusting gear; 444, adjusting rack; 51, first positioning block; 52, second positioning block; 6, covering mechanism; 61, extension block; 62, second rotating shaft; 63, covering plate; 64, driving assembly; 641, driving motor; 642, driving gear; 643, driven gear; 65, connecting plate; 66, connecting bolt. Detailed Embodiments

[0033] The following further elaborates on this application in conjunction with the attached Figure 1-6 drawings for a more detailed description.

[0034] An embodiment of this application discloses a low-pressure pipeline irrigation device for farmland.

[0035] Referring to Figure 1 and Figure 2 , a low-pressure pipeline irrigation device for farmland includes a water outlet pipe 1, and a water flow adjustment mechanism 2 is arranged at the water outlet end of the water outlet pipe 1; a protection mechanism 4 connected to the water flow adjustment mechanism 2 is arranged on the water outlet pipe 1.

[0036] Referring to Figure 3 and Figure 4 , the water flow adjustment mechanism 2 includes a bubbler 21, a first connecting pipe 221 is fixed at the water inlet end of the bubbler 21, and a threaded hole 2211 is provided on the first connecting pipe 221; the water outlet end of the water outlet pipe 1 is fixedly connected with a second connecting pipe 222, and an external thread threadedly connected to the threaded hole 2211 on the first connecting pipe 221 is arranged on the outer side wall of the second connecting pipe 222.

[0037] Threadedly connect the threaded hole 2211 on the first connecting pipe 221 and the external thread on the second connecting pipe 222 to realize the connection between the first connecting pipe 221 and the second connecting pipe 222.

[0038] Referring to Figure 3 and Figure 4 , a reinforcement mechanism 3 is arranged on the first connecting pipe 221. The reinforcement mechanism 3 includes a reinforcement sleeve 31 fixedly connected to the first connecting pipe 221, and the reinforcement is made of rubber; when the first connecting pipe 221 and the second connecting pipe 222 are threadedly connected, one end of the water outlet pipe 1 close to the second connecting pipe 222 is located inside the reinforcement sleeve 31; a second limiting groove 11 is provided on one end of the water outlet pipe 1 located inside the reinforcement sleeve 31, and a first limiting groove 311 is provided at one end of the reinforcement sleeve 31 away from the first connecting pipe 221. When the first connecting pipe 221 and the second connecting pipe 222 are threadedly connected, the first limiting groove 311 on the fixing sleeve corresponds to the second limiting groove 11 on the water outlet pipe 1; a hose clamp 32 is placed in the first limiting groove 311 inside the fixing sleeve, and a part of the hose clamp 32 and a part of the fixing sleeve can be located inside the second limiting groove 11 of the water outlet pipe 1.

[0039] Referring to Figure 2 and Figure 3 , the protection mechanism 4 includes a first fixing block 41, a first rotating shaft is rotatably connected to one side of the first fixing block 41, a second fixing block 42 is fixedly connected to the first rotating shaft, a third fixing block 43 is fixed to one end of the second fixing block 42 away from the first rotating shaft, and a fixing groove 411 for clamping the third fixing block 43 is provided on one side of the first fixing block 41 away from the first rotating shaft.

[0040] Both the first fixing block 41 and the second fixing block 42 are provided with placing grooves 421, and the first fixing block 41 and the second fixing block 42 are both provided with a first positioning groove 422 and a second positioning groove 423 communicating with the placing groove 421. A positioning mechanism is arranged on the water outlet pipe 1. The positioning mechanism includes a first positioning block 51 fixed on the water outlet pipe 1, and the first positioning block 51 can be clamped with the first positioning groove 422; a second positioning block 52 is fixedly connected to the first connecting pipe 221 between the fixed sleeve and the bubbler 21, and the second positioning block 52 can be clamped with the second positioning groove 423.

[0041] First, place a part of the first positioning block 51 on the water outlet pipe 1 in the first positioning groove 422 of the first fixing block 41, place a part of the second positioning block 52 on the first connecting pipe 221 in the second positioning groove 423 of the first fixing block 41, and place one end of the water outlet pipe 1 close to the bubbler 21 and one end of the bubbler 21 close to the water outlet pipe 1 in the placing groove 421 of the first fixing block 41. Then rotate the second fixing block 42 so that the side of the first positioning block 51 away from the first fixing block 41 enters the first positioning groove 422 of the second fixing block 42, the side of the second positioning block 52 away from the first fixing block 41 enters the second positioning groove 423 of the second fixing block 42, and one end of the water outlet pipe 1 close to the bubbler 21 and one end of the bubbler 21 close to the water outlet pipe 1 can enter the placing groove 421 of the second fixing block 42; and make the third fixing block 43 on the second fixing block 42 be clamped with the fixing groove 411 on the first fixing block 41.

[0042] Reference Figure 2 and Figure 5 As shown in [reference number] and [reference number], a cavity communicating with the fixing groove 411 is provided on the first fixing block 41. A locking assembly 44 is arranged on the first fixing block 41. The locking assembly 44 includes a locking block 441 slidably connected in the cavity. A locking groove for clamping the locking block 441 is provided on the side wall of the third fixing block 43; an adjusting shaft 442 is rotatably connected to the first fixing block 41. One end face of the adjusting shaft 442 is in the same vertical plane as the side wall of the first fixing block 41. The other end of the adjusting shaft 442 is located in the cavity. An adjusting gear 443 is key-connected to the adjusting shaft 442 located in the cavity; an adjusting rack 444 meshing with the adjusting gear 443 is fixedly connected to the locking block 441 located in the cavity. An adjusting hole is provided on the adjusting shaft 442 away from the adjusting gear 443.

[0043] After the third fixing block 43 is clamped with the fixing groove 411 on the first fixing block 41, the hexagon wrench is clamped with the adjusting hole on the adjusting shaft 442; then rotate the hexagon wrench, the hexagon wrench drives the adjusting shaft 442 to rotate, the adjusting shaft 442 drives the adjusting gear 443 to rotate, the adjusting gear 443 will drive the adjusting rack 444 to move, and the adjusting rack 444 will drive the locking block 441 to move towards the third fixing block 43, so that the locking block 441 is clamped with the locking groove on the third fixing block 43.

[0044] Reference Figure 1 and Figure 6 Figure 6 , a covering mechanism 6 is arranged on the first fixing block 41. The covering mechanism 6 includes an extension block 61 that abuts against the first fixing block 41. A connecting plate 65 that abuts against the first fixing block 41 is fixedly connected to the extension block 61. A connecting bolt 66 is arranged on the connecting plate 65. The connecting bolt 66 passes through the connecting plate 65 and is threadedly connected to the first fixing block 41; a second rotating shaft 62 is rotatably connected to the extension block 61. A covering plate 63 is fixedly connected to the second rotating shaft 62. The covering plate 63 can abut against one end of the bubbler 21 away from the first connecting pipe 221. A driving component 64 is arranged on the extension block 61. The driving component 64 includes a driving motor 641 fixedly connected to the extension block 61. A driving gear 642 is key-connected to the output shaft of the driving motor 641; a driven gear 643 that meshes with the driving gear 642 is key-connected to the second rotating shaft 62.

[0045] First, make both the connecting plate 65 and the extension block 61 abut against the first fixing block 41, and then make the connecting bolt 66 pass through the connecting plate 65 and be threadedly connected to the extension block 61; when it is necessary to block or cover the water outlet end of the bubbler, start the driving motor 641. The output shaft of the driving motor 641 drives the driving gear 642 to rotate, the driving gear 642 drives the driven gear 643 to rotate, the driven gear 643 drives the second rotating shaft 62 to rotate, and the second rotating shaft 62 will drive the covering plate 63 to rotate, so that the covering plate 63 abuts against one end of the bubbler 21 away from the first connecting pipe 221.

[0046] The implementation principle of a low-pressure pipeline irrigation device for farmland in an embodiment of the present application is as follows: First, threadedly connect the threaded hole 2211 on the first connecting pipe 221 and the external thread on the second connecting pipe 222. When one end of the first connecting pipe 221 away from the bubbler 21 abuts against the water outlet pipe 1, the threaded hole 2211 on the first connecting pipe 221 and the external thread on the second connecting pipe 222 are completely threadedly connected together.

[0047] When the end of the first connecting pipe 221 away from the bubbler 21 abuts against the water outlet pipe 1, the end of the water outlet pipe 1 close to the second connecting pipe 222 is located inside the reinforcement sleeve 31, and the first limiting groove 311 on the fixing sleeve corresponds to the second limiting groove 11 on the water outlet pipe 1; then adjust the hose clamp 32 located in the first limiting groove 311, and the hose clamp 32 will tighten the fixing sleeve, so that a part of the hose clamp 32 and a part of the fixing sleeve can be located in the second limiting groove 11 of the water outlet pipe 1.

[0048] Then place a part of the first positioning block 51 on the water outlet pipe 1 in the first positioning groove 422 of the first fixing block 41, place a part of the second positioning block 52 on the first connecting pipe 221 in the second positioning groove 423 of the first fixing block 41, and place both the end of the water outlet pipe 1 close to the bubbler 21 and the end of the bubbler 21 close to the water outlet pipe 1 in the placement groove 421 of the first fixing block 41. Then rotate the second fixing block 42, so that the side of the first positioning block 51 away from the first fixing block 41 enters the first positioning groove 422 of the second fixing block 42, the side of the second positioning block 52 away from the first fixing block 41 enters the second positioning groove 423 of the second fixing block 42, and the end of the water outlet pipe 1 close to the bubbler 21 and the end of the bubbler 21 close to the water outlet pipe 1 can enter the placement groove 421 of the second fixing block 42; and make the third fixing block 43 on the second fixing block 42 engage with the fixing groove 411 on the first fixing block 41. Then make the inner hexagon wrench engage with the adjustment hole on the adjustment shaft 442; then rotate the inner hexagon wrench, the inner hexagon wrench drives the adjustment shaft 442 to rotate, the adjustment shaft 442 drives the adjustment gear 443 to rotate, the adjustment gear 443 will drive the adjustment rack 444 to move, and the adjustment rack 444 will drive the locking block 441 to move in the direction close to the third fixing block 43, so that the locking block 441 engages with the locking groove on the third fixing block 43. The adjustment hole on the set adjustment shaft 442 needs to be adjusted with an inner hexagon wrench. When there is no tool, the adjustment shaft 442 will not rotate. Therefore, the inner hexagon wrench can be used as a key to reduce the adjustment of the adjustment shaft 442 by irrelevant personnel.

[0049] When irrigation is not required, start the drive motor 641 to make the cover plate 63 abut against the end of the bubbler 21 away from the first connecting pipe 221.

[0050] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A low-pressure pipe irrigation device for farmland, comprising a water outlet pipe (1), characterized in that: The water outlet pipe (1) is provided with a water flow adjustment mechanism (2), the water flow adjustment mechanism (2) comprising a bubbler (21) and a connection assembly (22), the bubbler (21) being arranged on the water outlet pipe (1) via the connection assembly (22).

2. A low-pressure pipe irrigation device for farmland according to claim 1, characterized in that: The connection assembly (22) comprises a first connection pipe (221) and a second connection pipe (222); the first connection pipe (221) is arranged on the bubbler (21), and a threaded hole (2211) is provided on the first connection pipe (221); the second connection pipe (222) is arranged on the water outlet pipe (1), and an external thread threadedly connected to the threaded hole (2211) is provided on the second connection pipe (222).

3. A low-pressure pipe irrigation device for farmland according to claim 2, characterized in that: The invention also comprises a reinforcement mechanism (3), the reinforcement mechanism (3) comprising a reinforcement sleeve (31) and a throat clamp (32), one end of the reinforcement sleeve (31) being arranged on the first connecting pipe (221), and one end of the water outlet pipe (1) close to the second connecting pipe (222) being located on the reinforcement sleeve (31); the reinforcement sleeve (31) is provided with a first limiting groove (311) for accommodating the throat clamp (32), and the water outlet pipe (1) is provided with a second limiting groove (11) for accommodating the throat clamp (32) and part of the reinforcement sleeve (31).

4. A low-pressure pipe irrigation device for farmland according to claim 2, characterized in that: The protective mechanism (4) further comprises a protection mechanism (4), the protection mechanism (4) comprising a first fixing block (41), a second fixing block (42), a third fixing block (43), a first rotating shaft and a locking assembly (44), wherein the first rotating shaft is rotatably arranged on the first fixing block (41), and the second fixing block (42) is arranged on the first rotating shaft; the third fixing block (43) is arranged on a side of the second fixing block (42) away from the first rotating shaft, and the first fixing block (41) is provided with a fixing groove (411) for engaging with the third fixing block (43); the locking assembly (44) is arranged on the first fixing block (41) and connected to the third fixing block (43); one end of the first fixing block (41) is pressed against the water outlet pipe (1) and the other end is pressed against the first connecting pipe (221); one end of the second fixing block (42) is pressed against the water outlet pipe (1) and the other end is pressed against the first connecting pipe (221).

5. A low-pressure pipe irrigation device for farmland according to claim 4, characterized in that: The locking assembly (44) comprises a locking block (441), an adjusting shaft (442), an adjusting gear (443) and an adjusting rack (444); the first fixing block (41) is provided with a cavity connected to the fixing groove (411); the locking block (441) is slidably arranged in the cavity; the third fixing block (43) is provided with a locking groove engaged with the locking block (441); the adjusting shaft (442) is rotatably arranged on the first fixing block (41); the adjusting gear (443) is key-connected to the adjusting shaft (442); the adjusting rack (444) is arranged on the locking block (441) and meshes with the adjusting gear (443).

6. A low-pressure pipe irrigation device for farmland according to claim 4, characterized in that: The invention also comprises a positioning mechanism, the positioning mechanism comprising a first positioning block (51) and a second positioning block (52), the first positioning block (51) being arranged on the water outlet pipe (1), the second positioning block (52) being arranged on the first connecting pipe (221), and the first fixing block (41) and the second fixing block (42) being provided with a first positioning groove (422) for clamping with the first positioning block (51) and a second positioning groove (423) for clamping with the second positioning block (52).

7. The low-pressure pipe irrigation device for farmland according to claim 4, characterized in that: The first fixed block (41) is provided with a covering mechanism (6), the covering mechanism (6) comprising an extension block (61), a second rotating shaft (62), a covering plate (63) and a driving assembly (64); the extension block (61) is provided on the first fixed block (41); the second rotating shaft (62) is rotatably provided on the extension block (61); the covering plate (63) is provided on the second rotating shaft (62), and the covering plate (63) is capable of contacting a side of the bubbler (21) away from the water outlet pipe (1); and the driving assembly (64) is provided on the extension block (61) and is connected to the second rotating shaft (62).

8. The low-pressure pipe irrigation device for farmland according to claim 7, characterized in that: The driving assembly (64) comprises a driving motor (641), a driving gear (642) and a driven gear (643); the driving motor (641) is arranged on the extension block (61); the driving gear (642) is key-connected to the output shaft of the driving motor (641); and the driven gear (643) is key-connected to the second rotating shaft (62) and meshes with the driving gear (642).

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