Foliage spraying equipment

Abstract

The invention discloses leaf surface spraying equipment, and relates to the field of agricultural pesticide spraying, the leaf surface spraying equipment comprises a supporting plate, the bottom of the supporting plate is fixedly connected with a plurality of universal wheels, the top of the supporting plate is rotatably connected with two adjusting threaded rods, and the outer surfaces of the adjusting threaded rods are in threaded fit with a lifting plate; according to the leaf surface spraying equipment, precise spraying is achieved through cooperation of multiple mechanisms, it is ensured that a proper distance is kept between a spray head and a nut tree in the spraying process, and the situation that spraying is uneven due to the too long distance or the situation that leaf surfaces, fruits and flowers are impacted due to the fact that the liquid medicine pressure is too large due to the too short distance is avoided; and therefore, falling is avoided. Under precise spraying, the pesticide uniformly acts on leaf surfaces, nuts and flowers, so that the flower and fruit retention effect is greatly improved, the loss rate of the nuts in the spraying process is effectively reduced, the fruiting rate and yield of nut trees are further improved, and remarkable yield increasing benefits are brought to farmers.

Description

TECHNICAL FIELD

[0001] The present application relates to agricultural pesticide spraying technology, in particular to a kind of foliage spraying equipment. BACKGROUND

[0002] In the field of agricultural planting, nut tree planting is an important part, and foliage spraying of pesticides on nut trees is a key link to ensure their healthy growth and improve yield. However, the existing foliage spraying technology and related equipment for nut trees have many shortcomings.

[0003] Traditional nut tree spraying methods rely heavily on manual operation, using simple spraying tools such as backpack sprayers. Workers need to hold the spraying pipe and walk back and forth between the nut trees, constantly adjusting the spraying angle and position. This method is extremely labor-intensive, especially in large-scale nut tree plantations, where workers carry heavy sprayers for a long time and frequently operate, which can easily lead to fatigue and low work efficiency. Moreover, manual operation cannot guarantee uniform spraying, and the amount of pesticide received by different parts of the foliage, nuts and flowers may vary greatly, affecting the flower and fruit retention effect.

[0004] Some spraying equipment with higher automation can reduce the workload to some extent, but still has defects in precise spraying. For example, the height adjustment range of some equipment is limited, which cannot adapt to nut trees at different growth stages and different heights, resulting in an inappropriate distance between the spraying head and the nut tree. If the distance is too far, the pesticide cannot evenly cover the foliage, nuts and flowers, causing uneven spraying; if the distance is too close, the water pressure of the sprayed pesticide is too high, which can easily impact the foliage, fruits and flowers, causing them to fall, increasing the loss rate of nuts and reducing the yield of nut trees.

[0005] In addition, the existing spraying equipment needs to be improved in terms of automation. In the mixing process of pesticides and water, most equipment still requires manual stirring, which not only consumes manpower but also cannot guarantee that the pesticides and water are fully mixed and evenly distributed, affecting the efficacy of the pesticide. During the spraying process, the coordination between the components of the equipment is insufficient, and the position of the spraying head cannot be automatically adjusted according to the actual position and shape of the nut tree, making it impossible to achieve full automation of spraying, further limiting the improvement of spraying effect and efficiency.

[0006] In summary, the existing foliage spraying technology and related equipment for nut trees have obvious shortcomings in precise spraying, automation and labor reduction, and cannot meet the needs of modern nut tree planting industry for efficient and precise spraying. Therefore, it is of great practical significance to develop a new type of foliage spraying equipment. SUMMARY

[0007] The purpose of the present application is to provide a foliage spraying equipment to solve the above-mentioned shortcomings in the prior art.

[0008] In order to achieve the above object, the present application provides the following technical scheme: a foliage spraying device, comprising a support plate, the bottom of the support plate is fixedly connected with a plurality of universal wheels, the top of the support plate is rotatably connected with two adjusting threaded rods, the outer surface of the adjusting threaded rod is threadedly connected with a lifting plate, the lifting plate is provided with a spraying mechanism connected with the support plate, and the spraying mechanism is used for spraying pesticide on nut trees;

[0009] The outer surface of the adjusting threaded rod is drivingly connected with a driving mechanism connected with the support plate, and the driving mechanism is used for driving the adjusting threaded rod to rotate.

[0010] Further, the spraying mechanism comprises a support frame fixedly connected with the lifting plate, a turnover shaft rotatably connected with the support frame, a first transmission mechanism drivingly connected with the support frame and arranged on the outer surface of the turnover shaft, the first transmission mechanism being used for driving the turnover shaft to rotate, a mounting block fixedly sleeved with the outer surface of the turnover shaft, a mounting ring fixedly connected with the top of the mounting block, a transmission ring rotatably connected in the mounting ring, a second transmission mechanism drivingly connected with the mounting ring and arranged on the outer surface of the transmission ring, the second transmission mechanism being used for driving the transmission ring to rotate, a first electric telescopic rod fixedly connected with the inner surface of the transmission ring through a connecting block, a spraying pipe fixedly connected with one end of the first electric telescopic rod, a plurality of nozzles fixedly connected with the outer surface of the spraying pipe, and a medicine supply mechanism connected with the support plate and fixedly connected with the outer surface of the spraying pipe, the medicine supply mechanism being used for supplying medicine to the spraying pipe.

[0011] Further, the first transmission mechanism comprises a second electric telescopic rod fixedly connected with the support frame, a transmission rack fixedly connected with one end of the second electric telescopic rod through a connecting block and slidably connected with the support frame, and a first transmission gear fixedly sleeved with the turnover shaft and meshingly connected on one side of the transmission rack.

[0012] Further, the second transmission mechanism comprises a first transmission motor fixedly connected with the mounting ring, a transmission shaft fixedly connected with the output end of the first transmission motor through a shaft coupling, a second transmission gear fixedly sleeved with the outer surface of the transmission shaft, and a transmission gear ring fixedly sleeved with the transmission ring and meshingly connected with the outer surface of the second transmission gear.

[0013] Further, the medicine supply mechanism comprises a medicine supply box fixedly connected with the support plate, a liquid supply pump fixedly connected in the medicine supply box, a hose fixedly connected with the mounting ring through a pipeline and connected with the output end of the liquid supply pump, a connecting pipe fixedly connected with the transmission ring through the hose, and a hose fixedly connected with the spraying pipe and connected with one end of the connecting pipe.

[0014] Further, the bottom of the support plate is fixedly connected with a second transmission motor, the output end of the second transmission motor is fixedly connected with a stirring shaft which is rotationally connected with the support plate and the medicine supply box through a shaft coupling, and the outer surface of the stirring shaft is fixedly connected with a stirring rod.

[0015] Further, the top of the medicine supply box is fixedly connected with a feeding pipe, and the bottom of the medicine supply box is fixedly connected with a drain pipe.

[0016] Further, the driving mechanism comprises a driving motor fixedly connected with the support plate, the output end of the driving motor is fixedly connected with a driving shaft through a shaft coupling, the outer surface of the driving shaft is fixedly sleeved with a first driving gear, and the outer surface of the first driving gear is meshingly connected with a second driving gear fixedly sleeved with the adjusting threaded rod.

[0017] Compared with the prior art, the foliar spraying equipment provided by the application has the following beneficial effects:

[0018] (1) The equipment realizes precise spraying through the cooperation of multiple mechanisms, the driving mechanism drives the lifting plate to move up and down, so that the spray head can cover different height parts of the nut tree; the first transmission mechanism controls the overturning of the mounting ring, the second transmission mechanism drives the transmission ring to rotate, and the position and distance of the spray head can be flexibly adjusted by cooperating with the first electric telescopic rod. This ensures that the spray head maintains an appropriate distance from the nut tree, avoids uneven spraying due to too far distance, or too close distance which causes the pressure of the pesticide to be too large to impact the leaves, nuts and flowers, and causes them to fall. Under precise spraying, the pesticide uniformly acts on the leaves, nuts and flowers, greatly improves the flower and fruit preservation effect, effectively reduces the loss rate of nuts during spraying, and thus improves the fruit setting rate and yield of the nut tree, thereby bringing significant yield increase benefits to farmers.

[0019] (2) The equipment has high automation characteristics, which greatly reduces the labor intensity of the user. In the medicine supply mechanism, the second transmission motor drives the stirring shaft and the stirring rod to automatically complete the sufficient mixing of the medicine and water without manual stirring; the liquid supply pump supplies medicine to the spraying pipe through the pipeline and the hose to realize automatic spraying. After the mobile equipment is moved to the side of the nut tree, each transmission mechanism automatically adjusts the position of the spray head according to the program without the need for the staff to hold the spraying pipe. After spraying is completed, the first transmission mechanism drives the mounting ring to overturn to the vertical position, reducing the occupied space and facilitating movement in the nut forest. The overall automatic design makes the operation of the user more relaxed, improves the spraying efficiency of the nut tree, and improves the overall use experience. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only show some embodiments of the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0021] Figure 1 It is a first perspective view of the external structure of the present application.

[0022] Figure 2 It is a second perspective view of the external structure of the present application.

[0023] Figure 3 It is a front view of the internal structure of the present application.

[0024] Figure 4 It is a top view of the internal structure of the mounting ring of the present application.

[0025] Figure 5 It is a zoomed-in view of A in the present application. Figure 1

[0026] Explanation of reference signs:

[0027] 1, support plate; 2, universal wheel; 3, adjusting threaded rod; 4, lifting plate; 11, support frame; 12, overturning shaft; 13, mounting block; 14, mounting ring; 15, transmission ring; 16, first electric telescopic rod; 17, spraying pipe; 18, spray head; 21, second electric telescopic rod; 22, transmission rack; 23, first transmission gear; 31, first transmission motor; 32, transmission shaft; 33, second transmission gear; 34, transmission gear ring; 41, medicine supply box; 42, liquid supply pump; 43, second transmission motor; 44, stirring shaft; 45, stirring rod; 51, drive motor; 52, drive shaft; 53, first drive gear; 54, second drive gear. DETAILED DESCRIPTION

[0028] In order to make those skilled in the art better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0029] Example one

[0030] Please refer to Figures 1 to 5 shown, a leaf surface spraying device, comprising a support plate 1, the bottom of the support plate 1 is fixedly connected with a plurality of universal wheels 2, the top of the support plate 1 is rotatably connected with two adjusting threaded rods 3, the outer surface of the adjusting threaded rod 3 is threadedly connected with a lifting plate 4, the lifting plate 4 is provided with a spraying mechanism connected with the support plate 1, the spraying mechanism is used for spraying pesticide on nut trees;

[0031] ​The outer surface of the adjusting screw rod 3 is drivingly connected with a driving mechanism connected with the support plate 1, and the driving mechanism is used to drive the adjusting screw rod 3 to rotate.

[0032] The driving mechanism comprises a driving motor 51 fixedly connected with the support plate 1, the driving motor 51 is controlled by a PLC programming program, and the driving motor 51 can control the driving motor 51 to rotate forward and reverse and the rotation angle, the output end of the driving motor 51 is fixedly connected with a driving shaft 52 through a shaft coupling, the outer surface of the driving shaft 52 is fixedly sleeved with a first driving gear 53, the outer surface of the first driving gear 53 is meshingly connected with a second driving gear 54 fixedly sleeved with the adjusting screw rod 3, the driving motor 51 drives the driving shaft 52 to rotate, and the driving shaft 52 drives the adjusting screw rod 3 to rotate through the first driving gear 53 and the second driving gear 54.

[0033] The device is moved to the side of the nut tree to be sprayed with pesticide through the universal joint 2 at the bottom of the support plate 1, then the lifting plate 4 is driven to move through the driving mechanism, the lifting plate 4 drives the spraying mechanism to move up and down, then the spraying mechanism uniformly sprays the surface of the nut tree through the cooperation of the spraying mechanism, so that the pesticide is uniformly sprayed on the leaf surface, nuts or flowers of the nut tree, thereby realizing spraying on the nut tree of any size, greatly improving the spraying effect and efficiency of the leaf surface, nuts or flowers of the nut tree, greatly improving the effect of flower and fruit preservation of the nut tree during the process of spraying pesticide on the nut tree, and further improving the yield of the nut tree.

[0034] Embodiment two

[0035] Based on the embodiment one, please refer to Figures 2 to 5 As shown in the figure, the spraying mechanism comprises a support frame 11 fixedly connected with the lifting plate 4, a turnover shaft 12 rotatably connected on the support frame 11, a first transmission mechanism drivingly connected with the support frame 11 on the outer surface of the turnover shaft 12, the first transmission mechanism being used to drive the turnover shaft 12 to rotate, a mounting block 13 fixedly sleeved on the outer surface of the turnover shaft 12, a mounting ring 14 fixedly connected on the top of the mounting block 13, a transmission ring 15 rotatably connected in the mounting ring 14, a second transmission mechanism drivingly connected with the mounting ring 14 on the outer surface of the transmission ring 15, the second transmission mechanism being used to drive the transmission ring 15 to rotate, a first electric telescopic rod 16 fixedly connected with the inner surface of the transmission ring 15 through a connecting block, a spraying pipe 17 fixedly connected with one end of the first electric telescopic rod 16, a plurality of nozzles 18 fixedly connected with the outer surface of the spraying pipe 17, and a medicine supply mechanism fixedly connected with the support plate 1 on the outer surface of the spraying pipe 17, the medicine supply mechanism being used to supply medicine to the spraying pipe 17.

[0036] The first transmission mechanism comprises a second electric telescopic rod 21 fixedly connected with the support frame 11, one end of the second electric telescopic rod 21 is fixedly connected with a transmission rack 22 slidingly connected with the support frame 11 through a connecting block, one side of the transmission rack 22 is meshingly connected with a first transmission gear 23 fixedly sleeved with the turnover shaft 12, the transmission rack 22 is driven to move by the second electric telescopic rod 21, the first transmission gear 23 is driven to rotate by the transmission rack 22, and the turnover shaft 12 is driven to rotate by the first transmission gear 23.

[0037] The second transmission mechanism comprises a first transmission motor 31 fixedly connected with the mounting ring 14, an output end of the first transmission motor 31 is fixedly connected with a transmission shaft 32 through a shaft coupling, the outer surface of the transmission shaft 32 is fixedly sleeved with a second transmission gear 33, the outer surface of the second transmission gear 33 is meshingly connected with a transmission gear ring 34 fixedly sleeved with the transmission ring 15, the transmission shaft 32 is driven to rotate by the first transmission motor 31, and the transmission gear ring 34 is driven to rotate by the second transmission gear 33.

[0038] The medicine supply mechanism comprises a medicine supply box 41 fixedly connected with the support plate 1, a liquid supply pump 42 is fixedly connected in the medicine supply box 41, an output end of the liquid supply pump 42 is fixedly connected with a hose fixedly connected with the mounting ring 14 through a pipeline, one end of the hose is fixedly connected with a connecting pipe fixedly connected with the transmission ring 15, one end of the connecting pipe is fixedly connected with a hose fixedly connected with the spraying pipe 17, the bottom of the support plate 1 is fixedly connected with a second transmission motor 43, an output end of the second transmission motor 43 is fixedly connected with a stirring shaft 44 rotationally connected with the support plate 1 and the medicine supply box 41 through a shaft coupling, the outer surface of the stirring shaft 44 is fixedly connected with a stirring rod 45, the top of the medicine supply box 41 is fixedly connected with a feeding pipe, the bottom of the medicine supply box 41 is fixedly connected with a drain pipe, the sprayed medicine and water are fed into the medicine supply box 41 through the feeding pipe, then the stirring shaft 44 is driven to rotate by the second transmission motor 43, the medicine and water in the medicine supply box 41 are stirred and mixed by the stirring rod 45, then the spraying pipe 17 is supplied with medicine through the liquid supply pump 42, the pipeline and the hose, the medicine is sprayed through the spray head 18, the medicine and water are fully mixed, manual mixing is not needed, the automation degree of the device is improved, and the use of the user is facilitated.

[0039] In the process of applying pesticide to nut trees, first, the support plate 1 is moved by the cooperation of the support plate 1 and the universal wheel 2, so that the pesticide spraying device is moved to the side of the nut tree, then the first transmission mechanism drives the rotating shaft 12 to rotate, the rotating shaft 12 drives the mounting block 13 and the mounting ring 14 to overturn, so that the mounting ring 14 is overturned to the horizontal position, then the second transmission mechanism drives the transmission ring 15 to rotate in the mounting ring 14, the transmission ring 15 drives the first electric telescopic rod 16 to rotate, the first electric telescopic rod 16 drives the spraying pipe 17 to move, and the first electric telescopic rod 16 drives the spraying pipe 17 and the spray head 18 to adjust according to the position of the spraying pipe 17 and the nut tree, so that the spray head 18 is adjusted to the appropriate position, avoiding that the spray head 18 is too far away from the sprayed nut tree, causing uneven spraying, or the spray head 18 is too close to the nut tree, causing the spray head 18 to spray water with too much pressure and impact on the leaves, fruits or flowers, causing the leaves, fruits and flowers to be knocked off, so that in the process of spraying pesticide on the nut tree, the effect of protecting flowers and fruits of the nut tree is greatly improved, and the lifting plate 4 is driven by the driving mechanism to move up and down, so that the spray head 18 can uniformly spray pesticide on the nut tree, realizing uniform spraying of the nut tree, while ensuring uniform spraying, effectively preventing the pressure of the sprayed pesticide from being too large, causing the leaves, fruits or flowers to fall off, further improving the fruit setting rate of the nut tree, while reducing the loss rate of nuts during spraying, improving the yield of the nut tree, improving the yield-increasing benefit of the farmer, and after the pesticide spraying is completed, then the first transmission mechanism drives the rotating shaft 12 to rotate, so that the mounting ring 14 is rotated to the vertical position with the ground, reducing the occupied space of the spraying mechanism in the mounting ring 14, facilitating the movement of the spraying device in the nut forest, facilitating the use of the user, and at the same time, the user does not need to hold the spraying pipe 17 to spray, realizing full automation of driving the spray head 18 to spray, reducing the labor intensity of the user, facilitating the use of the user, and also improving the spraying efficiency of the nut tree.

[0040] Working principle: in use, first, the support plate 1 and the universal wheel 2 are matched to move the support plate 1, so that the pesticide spraying device is moved to the side of the nut tree, then the first transmission mechanism drives the turnover shaft 12 to rotate, the turnover shaft 12 drives the mounting block 13 and the mounting ring 14 to overturn, so that the mounting ring 14 is overturned to the horizontal position, then the second transmission mechanism drives the transmission ring 15 to rotate in the mounting ring 14, the transmission ring 15 drives the first electric telescopic rod 16 to rotate, the first electric telescopic rod 16 drives the spraying pipe 17 to move, and the first electric telescopic rod 16 drives the spraying pipe 17 and the nozzle 18 to adjust according to the position of the spraying pipe 17 and the nut tree, so that the nozzle 18 is adjusted to the appropriate position, avoiding that the nozzle 18 is too far away from the nut tree to be sprayed, resulting in uneven spraying, or the nozzle 18 is too close to the nut tree, resulting in that the pressure of the sprayed pesticide is too large to impact on the leaves, fruits or flowers, causing the leaves, fruits and flowers to be knocked off, so that in the process of spraying pesticide on the nut tree, the effect of flower and fruit preservation of the nut tree is greatly improved, at the same time, the driving mechanism drives the lifting plate 4 to move up and down, so that the nozzle 18 can uniformly spray pesticide on the nut tree, realizing uniform spraying of the nut tree, while ensuring uniform spraying, effectively preventing the pressure of the sprayed pesticide from being too large to cause the leaves, fruits or flowers to fall off, further improving the fruit setting rate of the nut tree, while reducing the loss rate of nuts in the spraying process, improving the yield of the nut tree and the yield-increasing benefit of the farmer, after the pesticide spraying is completed, then the first transmission mechanism drives the turnover shaft 12 to rotate, so that the mounting ring 14 is rotated to the vertical position with the ground, reducing the occupied space of the spraying mechanism in the mounting ring 14, facilitating the movement of the spraying device in the nut forest, facilitating the use of the user, at the same time, the user does not need to hold the spraying pipe 17 to spray, realizing full automation of the driving nozzle 18 to spray, reducing the labor intensity of the user, facilitating the use of the user, and also improving the spraying efficiency of the nut tree.

[0041] The above only describes some exemplary embodiments of the present application by way of illustration, and it is needless to say that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present application. Therefore, the above drawings and description are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. A foliar spraying device, characterized in that: include: A support plate (1), wherein the bottom of the support plate (1) is fixedly connected to a plurality of universal wheels (2), the top of the support plate (1) is rotatably connected to two adjusting threaded rods (3), the outer surface of the adjusting threaded rod (3) is threadedly matched with a lifting plate (4), and the lifting plate (4) is provided with a spraying mechanism connected to the support plate (1), and the spraying mechanism is used for spraying pesticides on nut trees; The outer surface of the adjusting threaded rod (3) is transmission-connected to a driving mechanism connected to the support plate (1), and the driving mechanism is used to drive the adjusting threaded rod (3) to rotate.

2. A foliar spraying device according to claim 1, characterized in that: The spraying mechanism comprises a support frame (11) fixedly connected to the lifting plate (4); a flip shaft (12) is rotatably connected to the support frame (11); the outer surface of the flip shaft (12) is transmission-connected to a first transmission mechanism connected to the support frame (11); the first transmission mechanism is used to drive the flip shaft (12) to rotate; a mounting block (13) is fixedly sleeved on the outer surface of the flip shaft (12); a mounting ring (14) is fixedly connected to the top of the mounting block (13); a transmission ring (15) is rotatably connected inside the mounting ring (14); the transmission ring (15) is The outer surface transmission is connected to a second transmission mechanism connected to the mounting ring (14), the second transmission mechanism is used to drive the transmission ring (15) to rotate, the inner surface of the transmission ring (15) is fixedly connected to a first electric telescopic rod (16) through a connecting block, one end of the first electric telescopic rod (16) is fixedly connected to a spray pipe (17), the outer surface of the spray pipe (17) is fixedly connected to a plurality of spray heads (18), the outer surface of the spray pipe (17) is fixedly connected to a medicine supply mechanism connected to the support plate (1), and the medicine supply mechanism is used to supply medicine to the spray pipe (17).

3. A foliar spraying device according to claim 2, characterized in that: The first transmission mechanism comprises a second electric telescopic rod (21) fixedly connected to the support frame (11); one end of the second electric telescopic rod (21) is fixedly connected to a transmission rack (22) slidably connected to the support frame (11) via a connecting block; one side of the transmission rack (22) is meshedly connected to a first transmission gear (23) fixedly sleeved on the flip shaft (12).

4. A foliar spraying device according to claim 2, characterized in that: The second transmission mechanism comprises a first transmission motor (31) fixedly connected to the mounting ring (14); an output end of the first transmission motor (31) is fixedly connected to a transmission shaft (32) via a coupling; a second transmission gear (33) is fixedly sleeved on an outer surface of the transmission shaft (32); and an outer surface of the second transmission gear (33) is meshedly connected to a transmission ring gear (34) fixedly sleeved on the transmission ring (15).

5. The foliar spraying device according to claim 2, characterized in that: The medicine supply mechanism comprises a medicine supply box (41) fixedly connected to the support plate (1), a liquid supply pump (42) fixedly connected inside the medicine supply box (41), an output end of the liquid supply pump (42) fixedly connected to a hose fixedly connected to the mounting ring (14) through a pipeline, one end of the hose fixedly connected to a connecting pipe fixedly connected to the transmission ring (15) through the hose, and one end of the connecting pipe fixedly connected to a hose fixedly connected to the spraying pipe (17).

6. A foliar spraying device according to claim 5, characterized in that: A second transmission motor (43) is fixedly connected to the bottom of the support plate (1), and an output end of the second transmission motor (43) is fixedly connected to a stirring shaft (44) rotatably connected to both the support plate (1) and the medicine supply box (41) through a coupling, and a stirring rod (45) is fixedly connected to the outer surface of the stirring shaft (44).

7. A foliar spraying device according to claim 6, characterized in that: The top of the medicine supply box (41) is fixedly connected with a feeding pipe, and the bottom of the medicine supply box (41) is fixedly connected with a drainage pipe.

8. The foliar spraying device according to claim 1, characterized in that: The driving mechanism comprises a driving motor (51) fixedly connected to the support plate (1); an output end of the driving motor (51) is fixedly connected to a driving shaft (52) via a coupling; a first driving gear (53) is fixedly sleeved on the outer surface of the driving shaft (52); and a second driving gear (54) fixedly sleeved on the outer surface of the first driving gear (53) is meshedly connected to the adjusting threaded rod (3).

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