sprayer

Abstract

This utility model discloses a spraying machine, comprising: a chassis, the rear wheel assembly of which includes a hollow drive shaft driven by a power unit, the hollow drive shaft being rotatably mounted on the bottom of the frame via bearings, and rear wheel axles with adjustable axial positions connected to both ends of the hollow drive shaft, the rear wheel axles being equipped with rear track wheels, and bearings located on the inner sides of the two rear track wheels; the chassis frame is fixedly equipped with a vertical support, and a folding tray device is provided at the rear of the frame, the tray body of the folding tray being hinged to the rear side, the tray body being attached to and fixed to the vertical support when folded, and the tray body being located at the rear of the frame when unfolded for placing pesticide tanks. In its folded state, the length of the spraying machine is reduced by one-third, thereby reducing the volume of the machine during transport and improving the convenience of towing and moving it. Furthermore, the large wheelbase adjustment range greatly improves the machine's adaptability to greenhouses with inconsistent track gauges.

Description

Technical Field

[0001] This utility model relates to the field of sprayer technology, and in particular to a sprayer for use in greenhouses. Background Technology

[0002] Spraying pesticides has always been the biggest challenge in greenhouse cultivation. Various spraying machines that replace manual labor have emerged, but they are still far from meeting people's expectations for an economical and convenient solution. In recent years, with the widespread use of various suspension additives, it has become possible to use a sprayer to atomize the pesticide on one side of the greenhouse and then use a fan to blow the mist into the greenhouse to kill pests and diseases on crops.

[0003] Chinese utility model patent CN214629373U discloses a self-propelled sprayer that can spray while moving along one side of a greenhouse, with a fan blowing the spray throughout the entire greenhouse. It is convenient to use and saves labor. However, it is relatively large, and when moving it from one greenhouse to another, the upper sprayer needs to be disassembled and moved in parts, requiring two people to carry it. Otherwise, it is top-heavy and very inconvenient to operate, and the cost is also high.

[0004] To this end, the inventors of this utility model applied for a Chinese utility model patent entitled "Sprayer," with application number CN202520119692.5. In this patent application, the inventors integrated the air supply system and the air delivery system. The air pump and fan, being heavier, were fixed side-by-side on the chassis of the walking frame. The spray interface, being lighter, was separated from the fan and can be easily fixed to a suitable position on the walking frame via the air delivery pipe. The flexible air delivery pipe is easier to arrange. In this way, the machine's center of gravity is lowered, eliminating the "top-heavy" design. The structure is compact, and the fan does not need to be disassembled for relocation. Furthermore, the fan's air inlet faces the air pump, so that the airflow entering from the air inlet during fan operation cools the air pump, eliminating the need for a dedicated fan for air pump cooling. This ensures reliable operation of both the air pump and fan while reducing costs, achieving two goals at once through mutual assistance.

[0005] However, in actual use, some problems were found that still need further improvement.

[0006] Firstly, the size is still relatively large. This is mainly reflected in its length. Although the machine is equipped with transfer wheels, making it easy to move like a suitcase, installing and removing the transfer wheels is quite laborious, and packaging and transportation are also inconvenient.

[0007] Secondly, because the range of adjustment for the sprayer's wheel track is limited by the chassis width, when the track width is greater than the frame width, it is necessary to extend the axles on the outside of the frame, making operation and adjustment inconvenient. This is especially problematic when the same user owns multiple greenhouses with different wheel tracks, as frequent disassembly and reassembly of the extended outer wheels causes further inconvenience.

[0008] Thirdly, when the sprayer is working, it adjusts the spray nozzle to either high or low spray depending on the crop's growth stage. This is primarily achieved by vertically mounting the support rod for the spray nozzle on the support frame or horizontally mounting it on the chassis. However, this results in significant differences in the projected position of the spray nozzle on the horizontal plane. The optimal working state of the sprayer is to precisely stop spraying in the gaps between crop rows by recognizing or colliding with markers. Therefore, when the nozzle height varies, the marker position also needs to be adjusted simultaneously, which is cumbersome. Furthermore, due to the varying orientation of the greenhouse, the position of the atomizing nozzle needs to be adjusted not only vertically but also horizontally and even forward and backward. The large diameter and short length of the air supply hose mean it can only be bent and not rotated flexibly. When bending to different positions, the fixed contact point between the spray nozzle and the support rod cannot be guaranteed to be in the same position, which also hinders the quick installation of the spray nozzle.

[0009] Fourth, the support rod is installed in the middle of the support frame. When it extends and retracts, it occupies the lower space and interferes with the winding reel that stores the wires. As a result, the winding reel can only be set on the outside of the support frame, protruding from the sprayer frame, which will cause obstruction when passing through narrow passages.

[0010] Fifth, in order to touch the marker, the touch switch or limit switch is installed at the bottom of the frame chassis, and it is time-consuming and laborious to adjust the inner and outer distance and left and right direction of the touch switch. Utility Model Content

[0011] In view of this, the technical problem to be solved by this utility model is to provide a spraying machine that reduces the size of the machine during transfer and improves the convenience of towing and transferring the machine.

[0012] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0013] A spraying machine includes: a chassis, the chassis comprising a frame, a front wheel assembly, and a rear wheel assembly; the rear wheel assembly includes a hollow drive shaft driven by a power unit, the hollow drive shaft being rotatably mounted on the bottom of the frame via bearings, the two ends of the hollow drive shaft being respectively connected to axially adjustable rear wheel axles, the rear wheel axles being mounted with rear track wheels, and the bearings being located on the inner sides of the two rear track wheels; a vertical support is fixedly provided on the frame, and an air pump and a blower are mounted on the frame; the vertical support is located at the rear of the frame, and a folding tray assembly is provided at the rear, the folding tray assembly including a tray body hinged to the rear, the tray body being attached to and fixed to the vertical support when folded, and the tray body being located at the rear of the frame when unfolded for placing pesticide barrels.

[0014] The folding pallet device further includes a pull rope, the first end of which is connected to the vertical support, and the second end of which is connected to the pallet body. At least one end of the pull rope is hinged to a corresponding component via a hinge bolt.

[0015] A fixing device is provided between the tray body and the vertical support.

[0016] The fixing device includes a pin, which is disposed on the tray body.

[0017] The bottom of the tray body is provided with a limit switch adjustment bracket, which includes a telescopic rod and a limit switch mounting rocker arm. The telescopic rod is fixedly and adjustablely to the bottom of the tray body, and the limit switch rocker arm is fixed to the end of the telescopic rod.

[0018] The frame is equipped with an air storage chamber and also serves as an air storage bag device.

[0019] The front wheel device includes an axle tube, with an axially adjustable front wheel axle connected to both ends of the axle tube, and a front track wheel rotatably mounted on the front wheel axle.

[0020] The shaft tube is hinged to the bottom of the frame at its middle section.

[0021] The front wheel device is a swivel wheel device.

[0022] After adopting the above technical solution, the beneficial effects of this utility model are:

[0023] This invention transforms the base portion, originally located on one side of the vertical support for placing medicine barrels, into a folding tray structure. When folded, the tray body is attached to and fixed to the vertical support in a stowed state. When unfolded, the tray body is located at the rear of the frame for placing medicine barrels. In the stowed state, the length of the sprayer is reduced by one-third (equivalent to reducing the thickness of the "suitcase" when towed by one-third), thereby reducing the volume of the machine during transfer and improving the convenience of towing and transferring the machine. Moreover, due to the adoption of a new chassis structure, mainly the rear wheel assembly uses a hollow drive shaft driven by a power unit. The hollow drive shaft is rotatably mounted on the bottom of the frame via bearings. Both ends of the hollow drive shaft are respectively connected to rear wheel axles with adjustable axial positions. The rear wheel axles are equipped with rear track wheels, and the bearings are located on the inner side of the two rear track wheels. In this way, the wheel gauge adjustment range is no longer limited by the frame structure and the installation of bearings. The adjustment range is large, and it can be freely adjusted from the inner side to the outer side of the frame. Even in extreme cases where a longer wheel axle needs to be replaced, it is very easy. This greatly improves the machine's adaptability to the inconsistent track gauge of agricultural greenhouses.

[0024] In this invention, the folding tray device employs a pull rope structure so that the tray can hold a medicine barrel when unfolded, and is secured with pins for easy transport. A limit switch adjustment bracket is located at the bottom of the tray body. This bracket includes a telescopic rod and a limit switch mounting rocker arm. Pulling and fixing the telescopic rod adjusts the length of the limit switch extending from the frame to accommodate the lateral position of the ground contact object; rotating and fixing the telescopic rod adjusts the height of the limit switch to accommodate the distance from the ground contact object. Ground contact objects are spaced along the sprayer's travel path. When the limit switch touches an object, it sends a signal to the automatic start / stop device of the travel motor, controlling the motor's start and stop to implement intermittent spraying. Furthermore, because the limit switch adjustment bracket is installed at the bottom of the tray body, adjusting the switch is very convenient whether the tray is being raised and folded or lowered for use. Simultaneously, the flexible nature of the pull rope prevents it from bending and deforming during tray lifting and lowering, thus avoiding interference with the limit switch contacts and greatly facilitating machine operation.

[0025] In this invention, when the front wheel device adopts a wheel and axle structure, the middle part of the axle tube is hinged to the bottom of the frame, so that it forms a suspension structure in which the wheel and axle can swing up and down. The track wheel and the track always remain in contact and are not affected by the undulation of the bottom surface.

[0026] In this invention, the frame also serves as an air storage device. This structure eliminates the need for a separately installed air storage device, making the entire machine more compact and reducing costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the sprayer of this utility model in low-blowing working state;

[0028] Figure 2 yes Figure 1 The bottom view of the embodiment shown;

[0029] Figure 3 yes Figure 1 The front view of the hinge bolt in the illustrated embodiment;

[0030] Figure 4 yes Figure 1 A front view of another structure of the interface fastener in the illustrated embodiment;

[0031] Figure 5 yes Figure 1 Left view (partial) of the illustrated embodiment;

[0032] Figure 6 yes Figure 1 Right view (partial) of the illustrated embodiment;

[0033] Figure 7 yes Figure 1 The diagram shown is a structural schematic of the embodiment in the high-pressure blowing working state;

[0034] Figure 8 yes Figure 1 The diagram shown is a structural schematic of the embodiment in its folded storage state.

[0035] Figure 9 yes Figure 1 The diagram shown is a structural schematic of the embodiment in the transition state;

[0036] In the diagram: 11. Frame; 12. Vertical support; 13. Front wheel assembly; 131. Shaft tube; 132. Front wheel axle; 133. Front track wheel; 14. Rear wheel assembly; 141. Hollow drive shaft; 142. Drive gear; 143. Bearing housing; 144. Rear wheel axle; 145. Rear track wheel; 21. Pallet body; 22. Pull rope; 23. Hinged bolt; 24. Pin; 30. Air pump; 31. Air supply pipe; 40. Air supply... 41. Air supply duct; 42. Spray interface; 43. Atomizing nozzle; 50. Electrical control box; 60. Support frame; 61. Adjusting rod; 62. Angle adjustment plate; 62. Arc groove; 63. C-shaped pipe clamp; 64. Connecting arm; 65. Locking knob; 66. Hinge shaft; 70. Medicine tank; 71. Medicine delivery pipe; 80. Winding reel; 91. U-shaped clamp; 92. Telescopic rod; 93. Limit switch mounting rocker arm; 94. Limit switch. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] like Figure 1 As shown, a sprayer is equipped with a liquid supply system, an air supply system, an air delivery system, and an electrical control system on a mobile chassis. The liquid supply system includes a pesticide tank 70 and a water pump. The air supply system includes an air pump 30. The air delivery system includes a fan 40 and a spray interface 42. The spray interface 42 is connected to the fan 40 via an air delivery pipe 41, which is typically a flexible hose to allow for flexible placement of the spray interface 42. An atomizing nozzle 43 is fixedly installed inside the spray interface 42. The atomizing nozzle 43 is connected to the pesticide delivery pipe 71 of the liquid supply system and the air delivery pipe 31 of the air supply system. The electrical control system includes an electrical control box 50, which is electrically connected to the air pump 30, water pump, fan 40, and mobile motor, etc., for controlling the operation of these systems. The circuit structure of the electrical control system is well known to those skilled in the art and will not be described in detail here.

[0039] The chassis includes a frame 11, a front wheel assembly 13, and a rear wheel assembly 14, which are respectively mounted on the bottom of the frame 11. In this embodiment, the rear wheel assembly 14 is driven by a power unit (not shown in the figure), and the front wheel assembly 13 adopts a driven structure. To make both the front wheel assembly 13 and the rear wheel assembly 14 drive axles, the front wheel assembly 13 and the rear wheel assembly 14 can be connected by a transmission, such as a chain drive, belt drive, gear drive, etc., or the front wheel assembly 13 can be directly connected to the power unit. Of course, as an alternative arrangement, the rear wheel assembly 14 can also be driven independently by another power unit.

[0040] In this embodiment, the power unit is a walking motor, which uses an external power supply. The power cord is wound and unwound using a winding reel 80 (the installation structure and position of the winding reel 80 will be described in detail below). The air pump 30 and fan 40 have relatively high power; therefore, external power supply is preferred when greenhouse conditions permit. As a backup option, a generator can also provide power. Currently, electricity usage in agricultural greenhouses is generally not standardized. Placing the generator on a trailer (not shown in the figure) connected to the frame 11 and moving with the machine, generating electricity to power the corresponding walking motor or electronic control system, and then driving the front wheel device 13 and / or the rear wheel device 14 via the motor, is more practical. Of course, if the cost is acceptable, a storage battery can also be used for power supply.

[0041] See Figure 2 The rear wheel assembly 14 includes a hollow drive shaft 141 with a drive gear 142 mounted on it. The hollow drive shaft 141 is driven by the power unit via a gear transmission device. The hollow drive shaft 141 is rotatably mounted on the bottom of the frame 11 via bearings. The bearings are mounted on bearing seats 143, which are fixed to the lower part of the frame 11. Both ends of the hollow drive shaft 141 are respectively connected to axially adjustable rear wheel axles 144. Rear track wheels 145 are mounted on the rear wheel axles 144. The bearing seats 143 (containing bearings) are located inside the two rear track wheels 145, which are lower than the frame 11. To facilitate adjustment of the axial position of the rear wheel axles 144 and to transmit torque, the rear wheel axles 144 are preferably prismatic shafts, such as quadrangular or hexagonal shafts. Correspondingly, the hollow drive shaft 141 is provided with quadrangular or hexagonal shaft insertion holes that match the quadrangular or hexagonal shafts. As an alternative, the rear wheel axle 144 can also be threaded or keyed to the hollow drive shaft 141.

[0042] The front wheel assembly 13 includes an axle tube 131, which is mounted on the bottom of the frame 11. Both ends of the axle tube 131 are connected to an axially adjustable front wheel axle 132. A front track wheel 133 is rotatably mounted on the front wheel axle 132. Similar to the rear track wheel 145, the front track wheel 133 is lower than the frame 11. To facilitate adjustment of the axial position of the front wheel axle 132, the front wheel axle 132 and the axle tube 131 are connected by a plug-in structure.

[0043] The purpose of this design is to make the wheel gauge adjustment no longer restricted by the frame structure and bearing seat 143. The rear track wheel 145 or the front track wheel 133 can be freely adjusted from the inside to the outside of the frame 11 with a large adjustment range. Even in extreme cases where a longer axle needs to be replaced, it is very easy, which greatly improves the machine's adaptability to the non-uniform track gauge of agricultural greenhouses.

[0044] In this embodiment, the middle part of the shaft tube 131 is hinged to the bottom of the frame 11, forming a suspension structure in which the wheel axle can swing up and down, so that the track wheel and the track always remain in contact and are not affected by the undulation of the bottom surface.

[0045] In this embodiment, the front wheel assembly adopts an axially adjustable axle structure, forming a four-wheel layout together with the rear wheel assembly. However, the structure of the front wheel assembly is not limited to this; it can also adopt a universal wheel assembly, forming a three-wheel layout together with the rear wheel assembly to improve the machine's adaptability to the greenhouse floor.

[0046] In this embodiment, the frame 11 is provided with an air storage chamber, and the frame 11 also serves as an air storage device. This structure eliminates the need for a separately installed air storage tank, making the overall machine structure more compact and reducing costs.

[0047] like Figure 1 As shown, a vertical support 12 is provided on the frame 11. The air pump 30 and the fan 40 are fixed side by side on the frame 11, with the air pump 30 closer to the vertical support 12. The air inlet of the fan 40 faces the air pump 30. There are many types of fans 40. The air inlet of a centrifugal fan is more conducive to heat dissipation of the air pump, and its air outlet is also more conducive to connecting to the spray interface 42 through the air supply pipe 41.

[0048] In this embodiment, the vertical support 12 is located at the rear of the frame 11, and a folding tray device is provided at the rear. The folding tray device includes a tray body 21, a pull rope 22, and a fixing device. The tray body 21 is hinged to the rear, and after folding, the tray body 21 is attached to and fixed to the vertical support 12 (e.g., ...). Figure 8 As shown), after unfolding, the tray body 21 is located behind the frame 11 for placing the medicine barrel 70 (as shown). Figure 1 and Figure 7 (As shown).

[0049] like Figure 1 and Figure 8 As shown, the first end of the pull rope 22 is connected to the vertical support 12, and the second end of the pull rope 22 is connected to the pallet body 21. At least one end of the pull rope 22 is connected via a hinge bolt 23 (e.g., Figure 3 (As shown) and hinged to the corresponding components. In this embodiment, the first end of the pull rope 22 is directly hinged to the vertical support 12, and the second end is threaded, passes through the through hole of the hinge bolt 23, and is fixed to the hinge bolt 23 by two nuts. By adjusting the fixed position of the second end and the hinge bolt 23, the unfolding angle of the tray body 21 can be flexibly adjusted, providing more stable support for the medicine barrel 70. The hinge bolt 23 is rotatably installed on the tray body 21 so that the pull rope 22 can be freely bent and extended during the lowering and raising of the tray body 21.

[0050] like Figure 1 and Figure 2 As shown, the fixing device includes a pin 24, which is disposed on the tray body 21. After being lifted, the pin 24 is inserted into a socket of the vertical bracket 12 to fix the tray body 21. The structure of the fixing device is not limited to this; a locking structure of a door or vehicle door can also be used.

[0051] like Figure 1 and Figure 2 As shown, a limit switch adjustment bracket is provided at the bottom of the tray body 21. The adjustment bracket includes a telescopic rod 92 and a limit switch mounting rocker arm 93. The telescopic rod 92 is fixed to the bottom of the tray body 21 by a U-shaped clip 91 (or it can be fixed in other ways, such as first fixing a sleeve to the bottom of the tray body 21 and then inserting the telescopic rod 92 into the sleeve). The limit switch mounting rocker arm 93 is fixed to the end of the telescopic rod 92, and the limit switch 94 is mounted on the limit switch mounting rocker arm 93. Pulling out and fixing the telescopic rod 92 can adjust the length of the limit switch 94 extending out of the frame to adapt to the lateral position of the ground contact object; rotating and fixing the telescopic rod 92 can adjust the height of the limit switch 94 to adapt to the height of the ground contact object. The ground contact objects are spaced along the travel path of the sprayer. When the limit switch 94 touches a contact object, it sends a signal to the automatic start / stop device of the travel motor to control the start and stop of the travel motor and thus implement intermittent travel spraying operation. Furthermore, since the limit switch adjustment bracket is installed at the bottom of the tray body 21, adjusting the limit switch 94 is very convenient whether the tray body 21 is raised for storage or lowered for use. At the same time, combined with the flexible nature of the pull rope 22, the pull rope 22 will bend and deform during the raising and lowering of the tray body 21, without interfering with the contacts of the limit switch 94, thus providing great convenience for machine use.

[0052] This invention transforms the base portion, originally located behind the vertical support 12 for placing the medicine barrel 70, into a folding tray structure. When folded, the tray body 21 is attached to and fixed to the vertical support 12 in a stowed state. When unfolded, the tray body 21 is located behind the frame 11 for placing the medicine barrel 70. In the stowed state, the length of the sprayer is reduced by one-third, equivalent to reducing the thickness of the "suitcase" during transport by one-third, thereby reducing the machine's volume during transfer and improving the convenience of transporting the machine. See [reference needed]. Figure 9 .

[0053] The support device for the spray interface 42 is described in detail below.

[0054] like Figure 1 , Figure 5 and Figure 6 As shown, the spray interface 42 is connected to the vertical bracket 12 via a support device. The spray interface support device includes a support frame 60, adjusting rods 61, and interface fixing components. The support frame 60 includes a vertical rod portion and a horizontal rod portion, forming an inverted L shape. The vertical rod portion is height-adjustable and fixed to the vertical bracket 12 to maintain sufficient support strength. The horizontal rod portion extends forward to above the blower 40 and forms a connecting end. Along the left-right direction of the machine, the connecting end can be located in the middle or on both sides of the support frame 60, thus allowing the installation of one or two adjusting rods 61. Two adjusting rods 61 can form a dual spray interface structure, thereby spraying to both sides of the sprayer and improving work efficiency.

[0055] The adjusting rod 61 includes a height adjusting end and an interface mounting end. The height adjusting end and the interface mounting end are arranged parallel to each other, and a transition section is provided between them. The height adjusting end is adjustablely and fixedly connected to the support frame 60. In this way, simply reversing the adjusting rod 61 allows switching between high-blowing and low-blowing states without changing the projected position of the spray interface 42 on the horizontal plane. This eliminates the hassle of simultaneously adjusting the marker position under different spraying states. (See [reference]) Figure 1 and Figure 7 Furthermore, the crossbar portion of the support frame 60 is used to install the winding reel 80. Since they are a certain distance apart, the adjusting rod 61 will not interfere with the winding reel 80 when it is adjusted up and down. Therefore, the winding reel 80 does not need to be set on the outside of the support frame and will not protrude from the frame 11 of the sprayer, making it easier for the machine to pass through narrow passages.

[0056] The interface mounting end is connected to the interface fixing component via an angle adjustment structure. In this embodiment, the angle adjustment structure includes an angle adjustment plate 62 and a connecting arm 64. The angle adjustment plate 62 is disposed at the interface mounting end and has an arc-shaped groove 621. The connecting arm 64 is hinged to the angle adjustment plate 62, with one end fixed to the interface fixing component and the other end fixedly connected to the angle adjustment plate 62 via a fastener passing through the arc-shaped groove 621. The angle adjustment structure allows adjustment of the spray angle of the spray interface 42, thereby facilitating accurate positioning of the spray interface 42.

[0057] When using dual spray interfaces 42, the adjusting rod 61 needs to extend outward to provide sufficient installation space for the air supply duct 41. This extension inevitably affects the spray angle of the spray interface 42. In this embodiment, the adjusting rod 61 is a tubular component, and the angle adjusting plate 62 is rotatably mounted and fixedly connected to the adjusting rod 61 via a shaft head. This allows the angle of the spray interface 42 to be adjusted back, thereby offsetting the effect of the extending adjusting rod 61 and ensuring normal operation of the equipment.

[0058] like Figure 1 and Figure 6 As shown, in this embodiment, the interface fixing component adopts a C-shaped pipe clamp 63. In use, the spray interface 42 can be inserted into the opening of the C-shaped pipe clamp 63, and the elasticity of the clamp will secure the spray interface 42 within the C-shaped pipe clamp 63. This not only facilitates accurate positioning of the spray interface but also makes disassembly and assembly convenient, and ensures a secure and durable installation. Figure 4 As shown, two C-shaped pipe clamps 63 are fixed together end to end, which can easily form a dual-spray interface structure that sprays to one side. The C-shaped pipe clamps 63 are preferably made of steel wire.

[0059] This utility model is not limited to the above embodiments. All improvements made based on the concept, principle, structure and method of this utility model shall fall within the protection scope of this utility model.

Claims

1. A sprayer for applying pesticides, comprising: A mobile chassis, the mobile chassis comprising a frame, a front wheel assembly, and a rear wheel assembly; The rear wheel assembly includes a hollow drive shaft driven by a power unit. The hollow drive shaft is rotatably mounted on the bottom of the frame via bearings. Both ends of the hollow drive shaft are respectively connected to axially adjustable rear wheel axles. Rear track wheels are mounted on the rear wheel axles, and the bearings are located inside the two rear track wheels. The frame is fixedly equipped with a vertical support, and an air pump and a blower are mounted on the frame. Its characteristic is that… The vertical support is located at the rear of the frame. The rear frame is equipped with a folding tray device, which includes a tray body that is hinged to the rear frame. When folded, the tray body is attached to and fixed to the vertical support. When unfolded, the tray body is located at the rear of the frame for placing medicine barrels.

2. The sprayer as described in claim 1, characterized in that, The folding pallet device also includes a pull rope, the first end of which is connected to the vertical support, and the second end of which is connected to the pallet body. At least one end of the pull rope is hinged to a corresponding component via a hinge bolt.

3. The sprayer as described in claim 1, characterized in that, A fixing device is provided between the pallet body and the vertical support.

4. The sprayer as described in claim 3, characterized in that, The fixing device includes a pin, which is disposed on the tray body.

5. The sprayer as described in claim 1, characterized in that, The bottom of the tray body is provided with a limit switch adjustment bracket, which includes a telescopic rod and a limit switch mounting rocker arm. The telescopic rod is fixedly and adjustablely to the bottom of the tray body, and the limit switch rocker arm is fixed to the end of the telescopic rod.

6. The sprayer as described in claim 1, characterized in that, The frame is equipped with an air storage chamber, and the frame also serves as an air storage bag device.

7. The sprayer as described in claim 1, characterized in that, The front wheel assembly includes an axle tube, with an axially adjustable front wheel axle connected to both ends of the axle tube, and a front track wheel rotatably mounted on the front wheel axle.

8. The sprayer as described in claim 7, characterized in that, The shaft tube is hinged to the bottom of the frame at its middle section.

9. The sprayer as described in claim 1, characterized in that, The front wheel device is a swivel wheel device.

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