Spraying machine running chassis

Abstract

The utility model discloses a kind of spray pesticide machine walking chassis, comprising: rack, the bottom of the rack is equipped with front wheel device and rear wheel device;The front wheel device includes hollow drive shaft driven by first power device, the hollow drive shaft is rotatably installed in the bottom of the rack by bearing, the both ends of the hollow drive shaft are respectively transmission connection with the front wheel axle of adjustable axial position, the front rail wheel is installed in the front wheel axle, and the bearing is located in the inside of two front rail wheels.Wheel track adjustment, the utility model is no longer restricted by rack structure and mounting bearing, it can be freely adjusted from the inside of rack to outside, even in extreme case, it is very easy to replace longer axle, greatly improve the adaptability of machine to agricultural greenhouse track non-uniform.

Description

Technical Field

[0001] This utility model relates to the field of sprayer technology, and in particular to a walking chassis for a sprayer used 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, which features an air-assisted sprayer mounted on the upper part of the casing, with a fan-like oscillating device at the connection point. The casing houses an air pump, air tank, and a motor. While this sprayer can achieve the aforementioned spraying objectives to a certain extent, it is bulky. Moving it from one greenhouse to another requires disassembling the upper sprayer and transporting it separately, necessitating two people to lift it; otherwise, it becomes top-heavy, making operation very inconvenient and costly. Furthermore, the sprayer has high power, generally requiring an external power cord. Using a separate cord winder increases the difficulty of cord winding and operation. Therefore, the industry urgently needs a compact, easily portable, and reliable sprayer with further cost reduction.

[0004] To this end, the inventor of this utility model applied for a Chinese utility model patent entitled "Sprayer," with application number CN202520119692.5. In this patent application, the inventor 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 mist outlet, being lighter, was separated from the fan and easily fixed to a suitable position on the walking frame via the air delivery pipe. The flexible air delivery pipe is easier to arrange. As a result, 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 inlet during fan operation effectively 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 support. Meanwhile, the bottom of the walking frame is equipped with track wheels and transfer wheels. The contact point of the transfer wheels is higher than that of the track wheels. The upper part of the walking frame is equipped with a tie rod handrail. During operation, the transfer wheels are suspended in the air, and the walking frame can move easily on the ground track of the greenhouse via the track wheels. When transferring, the sprayer is tilted by the tie rod handrail. At this time, the transfer wheels are on the ground and the other parts are suspended in the air. Thus, one person can easily drag the machine to move it like a small trailer, which is very convenient to use.

[0005] However, in actual use, some issues still need further improvement. The main issue is its still relatively large size. Although the machine is equipped with transfer wheels, allowing it to be easily towed like a suitcase, some greenhouse entrances have deep steps that prevent the machine from being towed in. In such cases, it's difficult for one person to complete the transfer. Even in scenarios where towing is possible, installing and removing the transfer wheels still requires manual bending. Furthermore, the sprayer has a horizontal layout with a medicine tank, air pump, and fan, and a vertical layout with a support frame, electrical box, and hoses. When towed, the machine's horizontal length is roughly equivalent to the thickness of a suitcase, making tilting or lowering the machine quite strenuous.

[0006] Furthermore, because the range of adjustment for the sprayer's wheel track is limited by the chassis width, when the track width exceeds 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. Utility Model Content

[0007] In view of this, the technical problem to be solved by this utility model is to provide a walking chassis for a sprayer to improve the machine's adaptability to the inconsistent track gauge of agricultural greenhouses.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0009] A sprayer chassis includes: a frame, with a front wheel assembly and a rear wheel assembly mounted on the bottom of the frame; the front 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, and two ends of the hollow drive shaft being respectively connected to axially adjustable front wheel axles; the front wheel axles are equipped with front track wheels, and the bearings are located inside the two front track wheels.

[0010] The rear wheel device includes an axle tube, with an axially adjustable rear wheel axle connected to both ends of the axle tube. The rear wheel axle is rotatably mounted with a rear track wheel.

[0011] The shaft tube is hinged to the bottom of the frame at its middle section.

[0012] Wherein, the front track wheel is lower than the frame, and / or the rear track wheel is lower than the frame.

[0013] Wherein, the front wheel axle is a multi-faceted shaft, and the hollow drive shaft is provided with a prism shaft insertion hole that matches the multi-faceted shaft; or the front wheel axle is threaded or keyed to the hollow drive shaft.

[0014] The rear wheel device is a swivel wheel device.

[0015] The frame includes a main frame and a telescopic frame. The telescopic frame is telescopically and fixedly connected to the main frame. When pulled out, the telescopic frame is fixedly connected to the rear of the main frame. When retracted, the telescopic frame is stored under the main frame. The front wheel device is located on the main frame, and the rear wheel device is located on the telescopic frame.

[0016] The main frame is equipped with an air storage chamber, and the main frame also serves as an air storage bag device.

[0017] The rear wheel assembly is either connected to the front wheel assembly via a transmission connection, or the rear wheel assembly is connected to the power unit via a transmission connection, or the rear wheel assembly is driven by a second power unit.

[0018] The bottom of the frame is provided with a limit switch adjustment bracket, which includes a sleeve, a telescopic rod and a limit switch mounting rocker arm. The telescopic rod is inserted into the sleeve and the limit switch rocker arm is fixed to the end of the telescopic rod.

[0019] After adopting the above technical solution, the beneficial effects of this utility model are:

[0020] Because the hollow drive shaft of the front wheel assembly is rotatably mounted on the bottom of the frame via bearings, and the two ends of the hollow drive shaft are respectively connected to the axially adjustable front wheel axle, the front wheel axle is equipped with front track wheels, and the bearings are located on the inner side of the two front track wheels, 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, which greatly improves the machine's adaptability to the inconsistent track gauge of agricultural greenhouses.

[0021] In this invention, the rear wheel device can be an axially adjustable axle structure, forming a four-wheel layout together with the front wheel device; or it can be a universal wheel device, forming a three-wheel layout together with the front wheel device, to improve the machine's adaptability to the greenhouse floor.

[0022] In this utility model, when the rear wheel device adopts a wheel 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 axle can swing up and down. The track wheel and the track always maintain a close fit and are not affected by the undulation of the bottom surface.

[0023] In this invention, the frame is divided into a main frame and a telescopic frame. The telescopic frame is telescopically and fixedly connected to the main frame. When extended, the telescopic frame is fixedly connected to the rear of the main frame; when retracted, the telescopic frame is stored under the main frame. The front wheel assembly is located on the main frame, and the rear wheel assembly is located on the telescopic frame, allowing the generator to be placed on the main frame and the water tank on the telescopic frame. When the machine is in a parallel, stowed state, the telescopic frame retracts, and the electrical control box, fixed to the folding bracket, can be stored in the position where the telescopic frame is extended, making the machine more compact.

[0024] In this invention, the main 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.

[0025] In this invention, a limit switch adjustment bracket is provided at the bottom of the frame. By pulling out and fixing the telescopic rod, the length of the limit switch extending out of the frame can be adjusted to accommodate the lateral position of the ground contact object. By rotating and fixing the telescopic rod, the height of the limit switch can be adjusted to accommodate the height of the ground contact object. The ground contact objects are spaced along the travel path of the sprayer. When the limit switch 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, thereby implementing intermittent travel spraying operations. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the sprayer embodiment 1, which uses the chassis of the sprayer of this utility model, in an upright working state;

[0027] Figure 2 This is a schematic diagram of the structure of the sprayer embodiment 1, which uses the chassis of the sprayer of this utility model, in a parallel storage state;

[0028] Figure 3 A schematic diagram of the structure of the sprayer in embodiment 1, which uses the chassis of this utility model, when placed vertically in a parallel storage state;

[0029] Figure 4 A schematic diagram of the structure of the sprayer in embodiment 1, which uses the chassis of this utility model, when it is being towed in a parallel storage state;

[0030] Figure 5 yes Figure 1 A cross-sectional view of the folding positioning mechanism of Embodiment 1 shown;

[0031] Figure 6 yes Figure 5 The right view;

[0032] Figure 7 yes Figure 1 The above view shows the chassis of Embodiment 1.

[0033] Figure 8 This is a cross-sectional view of the folding positioning mechanism of Embodiment 2 of the sprayer using the chassis of the sprayer of this utility model;

[0034] Figure 9 yes Figure 8 The right view;

[0035] Figure 10 This is a cross-sectional view of the folding positioning mechanism of Embodiment 3 of the sprayer using the chassis of the sprayer of this utility model;

[0036] Figure 11 yes Figure 10 The right view;

[0037] In the picture:

[0038] 11. Main frame; 12. Telescopic frame; 121. Telescopic beam; 122. Guide sleeve; 13. Front wheel assembly; 131. Hollow drive shaft; 132. Drive gear; 133. Bearing seat; 134. Front wheel axle; 135. Front track wheel; 14. Rear wheel assembly; 141. Shaft tube; 142. Rear wheel axle; 143. Rear track wheel; 21. Folding bracket; 211. Vertical long slot; 221. Hinge seat; 221a. First open slot; 221b. Second open slot; 221c. Support leg; 222. Hinge shaft; 223. Lifting rod; 2 24. Elastic device; 225. Guide component; 226. Hinge seat; 2261. Limiting plate; 2262. Fixing plate; 2263. Arc groove; 2264. Limiting hole; 227. Bolt; 228. Knob; 229. Elastic pin; 30. Air pump; 31. Air supply pipe; 40. Fan; 41. Height adjustment device; 42. Mist outlet; 50. Electrical control box; 60. Generator; 70. Water tank; 71. Water supply pipe; 80. Atomizing nozzle; 91. Sleeve; 92. Telescopic rod; 93. Limit switch mounting rocker arm; 94. Limit switch. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] Example 1

[0041] like Figure 1 and Figure 2 As shown, a sprayer has a chassis comprising a frame, a front wheel assembly 13, and a rear wheel assembly 14, which are respectively mounted on the bottom of the frame. In this embodiment, the front wheel assembly 13 is driven by a first power unit (not shown), and the rear wheel assembly 14 adopts a driven structure. To make both the front wheel assembly 13 and the rear wheel assembly 14 drive axles, they can be connected by a transmission, such as a chain drive, belt drive, or gear drive, or the rear wheel assembly 14 can be directly connected to the first power unit. Of course, as an alternative arrangement, the rear wheel assembly 14 can also be driven independently by a second power unit.

[0042] In this embodiment, the first power unit is a walking motor, powered by a generator 60. Since the air pump and fan have relatively high power, external power supply is preferred when greenhouse conditions allow. Battery power can also be used if cost is acceptable. Currently, electricity usage in agricultural greenhouses is generally not standardized. Placing the generator 60 on the main 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 assembly 13 and / or the rear wheel assembly 14 via the motor, is more practical.

[0043] The sprayer is equipped with a liquid supply system, an air supply system, an air delivery system, and an electrical control system. The liquid supply system includes a water 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 mist outlet 42. An atomizing nozzle 80 is fixedly installed in the mist outlet 42. The atomizing nozzle 80 is connected to the water supply pipe 71 of the liquid supply system and the air supply 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, the water pump, the fan 40, and the travel motor, etc., and is used to control the operation of these systems. The electrical control system is well known to those skilled in the art and will not be described in detail here.

[0044] The air pump 30 is fixedly installed at one end of the frame, and the fan 40 is installed on the folding bracket 21 (in a more preferred embodiment, the fan 40 and the electrical control box 50 are respectively installed on both sides of the folding bracket 21). The folding bracket 21 is hinged to the frame and a folding positioning mechanism is provided between them. Through the folding positioning mechanism, the folding bracket 21 and the frame can form an upright working state and a parallel storage state.

[0045] like Figure 1 As shown, in the upright working state, the generator 60 and the water tank 70 of the liquid supply system are placed on the frame. At this time, the generator 60, water tank 70, and air pump 30 are arranged horizontally. Simultaneously, the air pump 30, fan 40, and electrical control box 50 are arranged vertically. The electrical control box 50 is positioned higher for easy observation and operation. The fan 40 and electrical control box 50 are installed on both sides of the folding bracket 21. The fan 40 is height-adjustable and fixed to the folding bracket 21 via the height adjustment device 41, allowing for convenient adjustment of the height of the mist outlet 42 to accommodate the height of fruits and vegetables. In this case, the mist outlet 42 can be directly installed at the air outlet of the fan 40, eliminating the need for an air supply duct and further reducing the machine's size.

[0046] like Figure 2 As shown, when it is necessary to move the machine, first remove the generator 60 and water tank 70, fold the folding bracket 21 so that the folding bracket 21 is parallel to the frame, and the machine is in a parallel storage state. The air pump 30, fan 40 and electrical control box 50 are arranged horizontally from left to right. At this time, the whole machine becomes a relatively low and flat shape.

[0047] like Figure 4 As shown, then, lift one end of the folding bracket 21, which also serves as a handle. The track wheel located below the air pump 30 remains on the ground, and can be directly used for transfer and towing. Because the machine is flat and compact with a low center of gravity, it is easier to tow or move, thus improving the machine's adaptability to agricultural greenhouses.

[0048] This example illustrates the specific structure of a folding positioning mechanism.

[0049] like Figure 5 and Figure 6 As shown, the folding positioning mechanism includes a hinge seat 221, an elastic device 224, and a lifting rod 223. The hinge seat 221 is fixed to the frame (in this embodiment, the main frame 11). The hinge seat 221 is provided with a first open slot 221a corresponding to the upright working state and a second open slot 221b corresponding to the parallel storage state. The elastic device 224 (preferably a compression spring) is disposed in the hollow cavity of the folding bracket 21. The folding bracket 21 has a vertical long slot 211. The lifting rod 223 includes a lifting part and a locking part. The locking part passes through the folding bracket 21 from the vertical long slot 211. The folding bracket 21 is hinged to the hinge seat 221 through the hinge shaft 222. In its natural state, the locking part is elastically pressed against the first open slot 221a or the second open slot 221b by the elastic device 224. When pulled up, the locking part compresses the elastic device 224 and disengages from the first open slot 221a or the second open slot 221b, thus realizing a state change.

[0050] In this embodiment, a transition portion is provided between the lifting portion and the locking portion, and a guide member 225 is provided on the folding bracket 21. The transition portion passes through the guide hole of the guide member 225, and the guide member 225 extends into the hollow cavity of the folding bracket 21 and abuts against the elastic device 224 to limit the elastic device 224.

[0051] To facilitate the disassembly and assembly of the lifting rod 223 and the elastic device 224, the folding bracket 21 can be configured as a separate insert structure, which also facilitates the adjustment of the height of the folding bracket 21.

[0052] The folding positioning mechanism is not limited to the specific structure described above. As long as the folding positioning mechanism enables the folding bracket 21 to form a stable upright working state and a parallel storage state with the chassis, more folding positioning mechanisms will be further described in Embodiments 2 and 3 below.

[0053] like Figure 3 As shown, the hinge seat 221 is provided with a support leg 221c extending to the front side of the frame. When the folding bracket 21 is in the storage state, the support leg 221c and the front track wheel 135 touch the ground together, which is convenient for vertical placement and saves space.

[0054] like Figure 7As shown, in this embodiment, the frame is divided into a main frame 11 and a telescopic frame 12. The telescopic frame 12 is telescopically and fixedly connected to the main frame 11. The telescopic frame 12 includes a telescopic beam 121, which is adapted to a guide sleeve 122, which is fixed to the main frame 11. When pulled out, the telescopic frame 12 is fixedly connected to the rear of the main frame 11. When retracted, the telescopic frame 12 is stored under the main frame 11. The front wheel device 13 is disposed on the main frame 11, and the rear wheel device 14 is disposed on the telescopic frame 12. Figure 1 As shown, the generator 60 is placed on the main frame 11, and the water tank 70 is placed on the telescopic frame 12. When the machine is in a parallel storage state, as... Figure 2 As shown, when the telescopic frame 12 retracts, the electrical control box 50 fixed to the folding bracket 21 can be stored in the position when the telescopic frame 12 is pulled out, making the machine more compact.

[0055] like Figure 7 As shown, the front wheel assembly 13 includes a hollow drive shaft 131, on which a drive gear 132 is provided. The hollow drive shaft 131 is driven by the first power device through a gear transmission device. The hollow drive shaft 131 is rotatably mounted on the bottom of the frame (in this embodiment, the main frame 11) via bearings. The bearings are mounted on bearing seats 133, which are fixed to the lower part of the main frame 11. The two ends of the hollow drive shaft 131 are respectively connected to a front wheel axle 134 with adjustable axial position. The front wheel axle 134 is equipped with front track wheels 135. The bearing seats 133 (containing bearings inside) are located inside the two front track wheels 135. The front track wheels 135 are lower than the frame (in this embodiment, the main frame 11). To facilitate adjustment of the axial position of the front wheel axle 134 and to transmit torque, the front wheel axle 134 is preferably a prismatic shaft, such as a square shaft or a hexagonal shaft. Correspondingly, the hollow drive shaft 131 is provided with square shaft insertion holes or hexagonal shaft insertion holes that match the square shaft or hexagonal shaft. Alternatively, the front wheel axle 134 can also be threaded or keyed to the hollow drive shaft 131.

[0056] The rear wheel assembly 14 includes an axle tube 141, which is mounted on the bottom of the frame (in this embodiment, the telescopic frame 12). Both ends of the axle tube 141 are connected to axially adjustable rear wheel axles 142. Rear track wheels 143 are rotatably mounted on the rear wheel axles 142. Similar to the front track wheels 135, the rear track wheels 143 are lower than the frame (in this embodiment, the main frame 11). To facilitate adjustment of the axial position of the rear wheel axles 142, the rear wheel axles 142 and the axle tube 141 are connected via a plug-in structure.

[0057] The purpose of this design is to make the wheel gauge adjustment no longer restricted by the frame structure and bearing seat 133. The front track wheel 135 or the rear track wheel 143 can be freely adjusted from the inside to the outside of the frame. Even if a longer axle is needed in extreme cases, it is very easy, which greatly improves the machine's adaptability to the non-uniform track gauge of agricultural greenhouses.

[0058] In this embodiment, the middle part of the shaft tube 141 is hinged to the bottom of the frame (in this embodiment, it refers to the telescopic frame 12), so that it forms 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.

[0059] In this embodiment, the rear wheel device adopts an axially adjustable axle structure, forming a four-wheel layout together with the front wheel device. However, the structure of the rear wheel device is not limited to this; it can also adopt a universal wheel device to form a three-wheel layout together with the front wheel device, thereby improving the machine's adaptability to the greenhouse floor.

[0060] In this embodiment, the main frame 11 is provided with an air storage chamber, and the main frame 11 also serves as an air storage device. This structure eliminates the need for a separately installed air storage tank, making the entire machine structure more compact and reducing costs.

[0061] In this embodiment, as Figure 1 and Figure 7 As shown, a limit switch adjustment bracket is provided at the bottom of the frame (in this embodiment, the main frame 11). The adjustment bracket includes a sleeve 91, a telescopic rod 92, and a limit switch mounting rocker arm 93. The telescopic rod 92 is inserted into the sleeve 91, and the limit switch mounting rocker arm 93 is fixed to the end of the telescopic rod 92. The limit switch 94 is mounted on the limit switch mounting rocker arm 93. Pulling out and fixing the telescopic rod 92 adjusts the length of the limit switch 94 extending out of the frame to accommodate the lateral position of the ground contact object; rotating and fixing the telescopic rod 92 adjusts the height of the limit switch 94 to accommodate 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 / stop of the travel motor and thus implement intermittent travel spraying operation.

[0062] Example 2

[0063] like Figure 8 and Figure 9 As shown, the concept of Embodiment 2 is basically the same as that of Embodiment 1, except that the structure of the folding positioning mechanism is different.

[0064] In this embodiment, the folding positioning mechanism includes a hinge seat 226 and a locking device. The hinge seat 226 is fixed to the frame (in this embodiment, it refers to the main frame 11). The folding bracket 21 is hinged to the hinge seat 226 via a hinge shaft 222. The hinge seat 226 is provided with a fixing plate 2262, which is provided with an arc-shaped groove 2263. The fixing plate 2262 extends to the front of the frame and also serves as a support leg. The locking device includes a bolt 227 and a knob 228. The bolt 227 passes through the arc-shaped groove 2263 of the folding bracket 21 and the fixing plate and is threadedly connected to the knob 228. When tightened, the folding bracket 21 is fixed to the hinge seat 226.

[0065] When bolt 227 abuts against one end of arc-shaped groove 2263 or when folding bracket 21 abuts against the limiting plate 2261 of hinge seat 226, folding bracket 21 is in the upright working state; when bolt 227 abuts against the other end of arc-shaped groove 2263 or when folding bracket 21 abuts against chassis, folding bracket 21 is in the parallel folded state. Compared with embodiment 1, the folding positioning mechanism of this embodiment is located on both sides of the frame, is firmly locked, eliminates the need for lifting rod 223, and facilitates operation of the folding positioning mechanism even when the fan is at a low position.

[0066] Example 3

[0067] like Figure 10 and Figure 11 As shown, the concept of Embodiment 3 is basically the same as that of Embodiment 1, except that the structure of the folding positioning mechanism is different.

[0068] In this embodiment, the folding positioning mechanism includes a hinge seat 226 and an elastic locking pin 229. The hinge seat 226 is fixed to the frame (in this embodiment, it refers to the main frame 11). The folding bracket 21 is hinged to the hinge seat 226 via a hinge shaft 222. The hinge seat 226 is provided with a fixing plate 2262, which is provided with at least two limiting holes 2264. One limiting hole 2264 corresponds to the upright working state, and the other limiting hole 2264 corresponds to the parallel storage state. The fixing plate 2262 extends to the front of the frame and also serves as a support leg. The elastic part of the elastic locking pin 229 is provided inside the folding bracket 21. The locking part of the elastic locking pin 229 extends out of the folding bracket 21 and engages with the limiting hole 2264 when needed. Pressing the elastic locking pin 229 disengages the locking part from the limiting hole 2264, thereby enabling the state transformation of the folding bracket 21.

[0069] Compared with Embodiment 1, the folding positioning mechanism in this embodiment is located on both sides of the frame, eliminating the need for the lifting rod 223, which makes it easier to operate the folding positioning mechanism even when the fan is at a low position.

[0070] This utility model is not limited to the above embodiments. For example, the structure of the folding positioning mechanism is sufficient as long as the folding bracket 21 and the chassis can form a stable upright working state and a parallel storage state through the folding positioning mechanism. No further examples will be listed.

[0071] 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 chassis for a sprayer, comprising: A frame, wherein a front wheel assembly and a rear wheel assembly are mounted at the bottom of the frame; characterized in that, The front wheel assembly includes a hollow drive shaft driven by a first 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 a front wheel axle with adjustable axial position. The front wheel axle is equipped with front track wheels, and the bearings are located inside the two front track wheels.

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

3. The sprayer chassis as described in claim 2, characterized in that, The shaft tube is hinged to the bottom of the frame at its middle section.

4. The sprayer chassis as described in claim 2, characterized in that, The front track wheel is lower than the frame, and / or the rear track wheel is lower than the frame.

5. The sprayer chassis as described in claim 2, characterized in that, The front wheel axle is a multi-faceted shaft, and the hollow drive shaft is provided with a prism shaft insertion hole that matches the multi-faceted shaft, or the front wheel axle is threaded or keyed to the hollow drive shaft.

6. The sprayer chassis as described in claim 1, characterized in that, The rear wheel assembly is a swivel wheel assembly.

7. The sprayer chassis as described in claim 1, characterized in that, The frame includes a main frame and a telescopic frame. The telescopic frame is telescopically and fixedly connected to the main frame. When pulled out, the telescopic frame is fixedly connected to the rear of the main frame. When retracted, the telescopic frame is stored under the main frame. The front wheel device is located on the main frame, and the rear wheel device is located on the telescopic frame.

8. The sprayer chassis as described in claim 7, characterized in that, The main frame is equipped with an air storage chamber, and the main frame also serves as an air storage bag device.

9. The sprayer chassis as described in claim 1, characterized in that, The rear wheel assembly is driven by the front wheel assembly, or the rear wheel assembly is driven by the first power device, or the rear wheel assembly is driven by the second power device.

10. The sprayer chassis as described in claim 1, characterized in that, The bottom of the frame is provided with a limit switch adjustment bracket, which includes a sleeve, a telescopic rod and a limit switch mounting rocker arm. The telescopic rod is inserted into the sleeve and the limit switch rocker arm is fixed to the end of the telescopic rod.

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