Bidirectional variable drive assembly, sprayer hydraulic walking system and sprayer

Abstract

The invention discloses a two-way variable drive assembly, a sprayer hydraulic walking system and a sprayer, the two-way variable drive assembly comprises a hydraulic drive motor, a first variable regulation and control assembly, a three-position three-way valve and a first overflow valve, the hydraulic drive motor is a two-way variable hydraulic motor and is provided with a valve plate and two working oil ports; the first variable regulation and control assembly is provided with an oil inlet, an oil outlet and a driving end, the driving end of the first variable regulation and control assembly is in linkage with a valve plate of the hydraulic driving motor, the three-position three-way valve is provided with an oil outlet, two working oil ports and two pilot oil ports, one working oil port of the hydraulic driving motor is communicated with one working oil port and one pilot oil port of the three-position three-way valve, and the other working oil port of the hydraulic driving motor is communicated with one pilot oil port of the three-position three-way valve. And the other working oil port of the hydraulic driving motor is communicated with the other working oil port of the three-position three-way valve and the pilot oil port, and an oil outlet of the three-position three-way valve is communicated with the oil tank through the first overflow valve, so that the hydraulic driving motor can be controlled by the first variable regulation and control assembly to reverse when running.

Description

Technical Field

[0001] The invention belongs to the technical field of sprayers, and in particular relates to a bidirectional variable drive assembly, a sprayer hydraulic travel system and a sprayer. Background Art

[0002] The transmission system of the chassis of the transmission sprayer is mostly a mechanical gearbox and a front and rear axle structure to drive the four wheels to move (that is, one drive motor drives the four wheels to rotate, although it is also a four-wheel drive mode), but its driving force is small, and the wheels are easy to slip, and the operation is inconvenient. Although the document number CN 205064409U "Hydraulic Travel Driving System of Sprayer" discloses that the four wheels of the sprayer are driven by four hydraulic motors, its hydraulic motor adopts a bidirectional quantitative motor, and its controllability is still insufficient. Summary of the invention

[0003] In order to solve the above technical problems, one of the objectives of the present invention is to provide a bidirectional variable drive assembly which has a simple structure, can be easily switched, and can regulate its rotation speed.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a bidirectional variable drive assembly, comprising a hydraulic drive motor, a first variable control component, a three-position three-way valve and a first overflow valve, the hydraulic drive motor being a bidirectional variable hydraulic motor, having a distribution plate and two working oil ports, the first variable control component having an oil inlet, an oil outlet and a driving end, and its driving end is linked with the distribution plate of the hydraulic drive motor, the three-position three-way valve having an oil outlet, two working oil ports and two pilot oil ports, one working oil port of the hydraulic drive motor is connected with one working oil port and one pilot oil port of the three-position three-way valve, the other working oil port of the hydraulic drive motor is connected with another working oil port and a pilot oil port of the three-position three-way valve, and the oil outlet of the three-position three-way valve is connected with the oil tank through the first overflow valve.

[0005] The beneficial effect of the above technical solution is that when the hydraulic drive motor is running, it can be reversed by the control of the first variable control component, and part of the hydraulic oil circulating in the hydraulic drive motor is discharged into the oil tank through the three-position three-way valve for cooling.

[0006] In the above technical scheme, the first variable control component includes a first variable cylinder and a two-position four-way solenoid valve, the two-position four-way solenoid valve has an oil inlet, an oil outlet and two working oil ports, the first variable cylinder has two oil ports, the two oil ports of the first variable cylinder correspond one-to-one to the two working oil ports of the two-position four-way solenoid valve and are connected to each other, the telescopic end of the first variable cylinder constitutes the driving end of the first variable control component, the oil outlet of the two-position four-way solenoid valve constitutes the oil outlet of the first variable control component and is connected to the oil tank, the oil inlet of the two-position four-way solenoid valve constitutes the oil inlet of the first variable control component, and the driving end of the first variable cylinder is linked to the spring reset end of the two-position four-way solenoid valve through a feedback rod.

[0007] The beneficial effect of the above technical solution is that: after receiving the electrical signal, the two-position four-way solenoid valve controls the extension and retraction of the first variable cylinder to drive the hydraulic drive motor to switch direction.

[0008] The second object of the present invention is to provide a hydraulic travel system for a sprayer which has a simple structure, is easy to operate, and has multiple functions.

[0009] In order to achieve the above-mentioned purpose, another technical solution of the present invention is as follows: a hydraulic travel system of a sprayer, comprising a hydraulic oil supply assembly and four bidirectional variable drive assemblies as described above, the four hydraulic drive motors and the four first variable control components are all connected to the bidirectional variable drive assembly, and the bidirectional variable drive assembly is used to provide a power source for the bidirectional variable drive assembly.

[0010] The beneficial effect of the above technical solution is that the hydraulic oil supply assembly provides hydraulic oil and power source to four bidirectional variable drive assemblies, and the four hydraulic drive motors are respectively driven by the four wheels. At this time, the four hydraulic drive motors independently drive the four wheels to rotate, which makes the whole sprayer more maneuverable.

[0011] The hydraulic oil supply assembly described in the above technical solution has a circulating pump and an oil replenishing pipe group. The circulating pump is a bidirectional variable hydraulic pump, which has two working oil ports. One working oil port of the hydraulic drive motor is connected to one working oil port of the circulating pump, and the other working oil port of the hydraulic drive motor is connected to the other working oil port of the circulating pump. The oil inlet of the first variable control component is connected to the oil replenishing pipe group, and the two working oil ports of the circulating pump are connected to the oil replenishing pipe group, and second overflow valves are respectively arranged at the connecting points. The oil replenishing pipe group is used to take hydraulic oil from the oil tank and apply hydraulic power.

[0012] The beneficial effect of the above technical solution is that: the circulating pump supplies hydraulic oil to the four hydraulic drive motors, and a circulating oil circuit is formed between the circulating pump and each hydraulic drive motor. Since part of the hydraulic oil at each hydraulic drive motor will be discharged into the oil tank through the three-position three-way valve for cooling, the circulating oil circuit also needs to be replenished with oil in real time by the oil replenishing pipe group through the second overflow valve.

[0013] The hydraulic oil supply assembly described in the above technical solution also includes a second variable control component, which has an oil inlet, an oil outlet and a drive end. The circulating pump has a distribution plate. The drive end of the second variable control component is linked to the distribution plate of the circulating pump. The oil inlet of the second variable control component is connected to the oil replenishing pipe group, and the oil outlet of the second variable control component is connected to the oil tank.

[0014] The beneficial effect of the above technical solution is that: the second variable control component is used to control the circulating pump to perform the reversing operation, and at this time the circulating pump can keep synchronization with the running direction of the hydraulic drive motor.

[0015] In the above technical solution, the second variable control component has a second variable cylinder and a three-position four-way valve, the telescopic end of the second variable cylinder constitutes the driving end of the second variable control component, the second variable cylinder has two oil ports, the three-position four-way valve has an oil inlet, an oil outlet and two working oil ports, the two working oil ports of the three-position four-way valve and the two oil ports of the second variable cylinder correspond one to one and are connected to each other, the driving end of the second variable cylinder is also linked to the valve sleeve of the three-position four-way valve through a feedback rod, and the oil inlet and oil outlet of the three-position four-way valve respectively constitute the oil inlet and oil outlet of the second variable control component.

[0016] The beneficial effect of the above technical solution is that its structure is simple, so that the three-position four-way valve can control the extension and retraction of the second variable cylinder and adjust the running direction of the circulation pump by receiving instructions.

[0017] The hydraulic oil supply assembly described in the above technical solution also includes a control valve group, which has a third variable cylinder and two solenoid control valves. The third variable cylinder has two oil ports, and the telescopic end of the third variable cylinder is linked to the valve core of the three-position four-way valve. The two solenoid control valves each have an oil inlet, an oil outlet and a working oil port. The oil inlets of the two solenoid control valves are connected to the oil replenishing pipe group, and the oil outlets of the two solenoid control valves are connected to the oil tank. Each oil port of the third variable cylinder is respectively connected to an oil outlet of the solenoid control valve.

[0018] The beneficial effect of the above technical solution is that the third variable cylinder is extended and retracted under the control of the two electromagnetic control valves to control the operating state of the three-position four-way valve, and finally the operating state of the circulation pump is controlled by the second variable cylinder.

[0019] There are two hydraulic oil supply assemblies in the above technical solution, and the four bidirectional variable drive assemblies are equally divided into two groups and correspond one to one with the two hydraulic oil supply assemblies. The two hydraulic drive motors in the same group are connected in parallel, and their two working oil ports are respectively connected to the two working oil ports corresponding to the circulating pump, and the two oil replenishment pipe groups are connected in series and connected to the oil inlets of the four first variable control components.

[0020] The beneficial effect of the above technical solution is that each hydraulic oil supply assembly controls two hydraulic drive motors, such as the hydraulic drive motor on the front left side and the hydraulic drive motor on the right rear side are controlled by one hydraulic oil supply assembly, while the hydraulic drive motor on the front right side and the hydraulic drive motor on the left rear side are controlled by another hydraulic oil supply assembly. At this time, the four wheels are cross-controlled, so that the entire sprayer has the functions of going straight, retreating, turning around on the spot or moving sideways in a crab shape.

[0021] In the above technical solution, the two third variable cylinders are respectively the third variable cylinder A and the third variable cylinder B, one oil port of the third variable cylinder A is connected to one oil port of the third variable cylinder B, and the other oil port of the third variable cylinder A is connected to the other oil port of the third variable cylinder B.

[0022] The beneficial effect of the above technical solution is that the variable displacement control oil circuits of the two circulating pumps are connected, thereby ensuring that the pressures of the control oil circuits are consistent, which can better ensure that the displacements of the two circulating pumps are the same and the control is more precise.

[0023] The third object of the present invention is to provide a sprayer which has a simple structure, strong power and convenient operation.

[0024] In order to achieve the above-mentioned object, the technical solution of the present invention is as follows: a sprayer comprises the sprayer hydraulic travel system as described above.

[0025] The beneficial effects of the above technical solution are: it has a simple structure, strong power, and diverse operating modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the bidirectional variable drive assembly described in Example 1 of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the hydraulic travel system of the sprayer according to Embodiment 2 of the present invention;

[0028] Figure 3 for Figure 2 Structural diagram of the hydraulic oil supply assembly;

[0029] Figure 4This is a schematic diagram of the structure of the hydraulic travel system of the sprayer according to Embodiment 3 of the present invention;

[0030] Figure 5 for Figure 4 Schematic diagram of the structure of the two hydraulic oil supply assemblies.

[0031] In the figure: 1. Bidirectional variable drive assembly; 11. Hydraulic drive motor; 12. First variable control component; 121. First variable cylinder; 122. Two-position four-way solenoid valve; 13. Three-position three-way valve; 14. First overflow valve; 2. Hydraulic oil supply assembly; 21. Circulation pump; 22. Oil replenishment pipe group; 221. Oil supply pump; 222. Oil filter; 223. Bypass overflow valve; 23. Second overflow valve; 24. Second variable control component; 241. Second variable cylinder; 242. Three-position four-way valve; 25. Control valve group; 251. Third variable cylinder; 251a. Third variable cylinder A; 251b. Third variable cylinder B; 252. Solenoid control valve. DETAILED DESCRIPTION

[0032] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0033] Example 1

[0034] like Figure 1 As shown, this embodiment provides a bidirectional variable drive assembly, including a hydraulic drive motor 11, a first variable control component 12, a three-position three-way valve 13 and a first overflow valve 14, wherein the hydraulic drive motor 11 is a bidirectional variable hydraulic motor, which has a distribution plate and two working oil ports, the first variable control component 12 has an oil inlet, an oil outlet and a drive end, and its drive end is linked with the distribution plate of the hydraulic drive motor 11, the three-position three-way valve 13 has an oil outlet, two working oil ports and two pilot oil ports, and the hydraulic drive motor A working oil port of the hydraulic drive motor 11 is connected with a working oil port and a pilot oil port of the three-position three-way valve 13, another working oil port of the hydraulic drive motor 11 is connected with another working oil port and a pilot oil port of the three-position three-way valve 13, and the oil outlet of the three-position three-way valve 13 is connected with the oil tank through the first overflow valve 14, so that when the hydraulic drive motor is running, it can be controlled by the first variable control component to perform reversing, and part of the hydraulic oil circulating in the hydraulic drive motor is discharged into the oil tank through the three-position three-way valve for cooling.

[0035] In the above technical scheme, the first variable control component 12 includes a first variable cylinder 121 and a two-position four-way solenoid valve 122, the two-position four-way solenoid valve 122 has an oil inlet, an oil outlet and two working oil outlets, the first variable cylinder 121 has two oil outlets, the two oil outlets of the first variable cylinder 121 correspond one-to-one to the two working oil outlets of the two-position four-way solenoid valve 122 and are connected to each other, the telescopic end of the first variable cylinder 121 constitutes the driving end of the first variable control component 12, the oil outlet of the two-position four-way solenoid valve 122 constitutes the oil outlet of the first variable control component 12 and is connected to the oil tank, the oil inlet of the two-position four-way solenoid valve 122 constitutes the oil inlet of the first variable control component 12, the driving end of the first variable cylinder 121 is linked with the spring reset end of the two-position four-way solenoid valve 122 through a feedback rod, so that the two-position four-way solenoid valve controls the telescopic movement of the first variable cylinder after receiving the electrical signal to drive the hydraulic drive motor to reverse.

[0036] in, Figure 1 A and B represent two working oil ports of the hydraulic drive motor 11 , and E represents the fluid inlet of the four-way solenoid valve 122 .

[0037] Example 2

[0038] like Figure 2 and Figure 3 As shown, this embodiment provides a hydraulic travel system for a sprayer, including a hydraulic oil supply assembly 2 and four bidirectional variable drive assemblies 1 as described in Example 1, the four hydraulic drive motors 11 and the four first variable control components 12 are all connected to the bidirectional variable drive assembly 1, and the bidirectional variable drive assembly 1 is used to provide a power source for the bidirectional variable drive assembly 1, so that the hydraulic oil supply assembly provides hydraulic oil and power source for the four bidirectional variable drive assemblies, and the four hydraulic drive motors are respectively driven by four wheels. At this time, the four hydraulic drive motors independently drive the four wheels to rotate, which makes the whole sprayer more maneuverable.

[0039] The hydraulic oil supply assembly 2 in the above technical solution has a circulating pump 21 and an oil replenishing pipe group 22. The circulating pump 21 is a bidirectional variable hydraulic pump having two working oil ports. One working oil port of the hydraulic drive motor 11 is connected to one working oil port of the circulating pump 21, and the other working oil port of the hydraulic drive motor 11 is connected to the other working oil port of the circulating pump 21. The oil inlet of the first variable control component 12 is connected to the oil replenishing pipe group 22, and the two working oil ports of the circulating pump 21 are connected to the connecting point of the oil replenishing pipe group 22, and a second overflow valve 23 is respectively provided at the connecting point. The oil replenishing pipe group 22 is used to take hydraulic oil from the oil tank and apply hydraulic power. In this way, the circulating pump supplies hydraulic oil to the four hydraulic drive motors, and a circulating oil circuit is formed between the circulating pump and each hydraulic drive motor. Since part of the hydraulic oil at each hydraulic drive motor will be discharged into the oil tank through a three-position three-way valve for cooling, the circulating oil circuit also needs to be replenished in real time by the oil replenishing pipe group through the second overflow valve.

[0040] The hydraulic oil supply assembly 2 in the above technical solution also includes a second variable control component 24, which has an oil inlet, an oil outlet and a driving end. The circulating pump 21 has a distribution plate. The driving end of the second variable control component 24 is linked to the distribution plate of the circulating pump 21. The oil inlet of the second variable control component 24 is connected to the oil replenishment pipe group 22, and the oil outlet of the second variable control component 24 is connected to the oil tank. In this way, the second variable control component is used to control the circulating pump to perform reversing operations. At this time, the circulating pump can keep synchronization with the running direction of the hydraulic drive motor.

[0041] In the above technical scheme, the second variable control component 24 has a second variable cylinder 241 and a three-position four-way valve 242. The telescopic end of the second variable cylinder 241 constitutes the driving end of the second variable control component 24. The second variable cylinder 241 has two oil ports. The three-position four-way valve 242 has an oil inlet, an oil outlet and two working oil ports. The two working oil ports of the three-position four-way valve 242 and the two oil ports of the second variable cylinder 241 correspond one to one and are connected to each other. The driving end of the second variable cylinder 241 is also linked to the valve sleeve of the three-position four-way valve 242 through a feedback rod. The oil inlet and the oil outlet of the three-position four-way valve 242 respectively constitute the oil inlet and the oil outlet of the second variable control component 24. The structure is simple, so that the three-position four-way valve can control the telescopic movement of the second variable cylinder and adjust the running direction of the circulating pump by receiving instructions.

[0042] The hydraulic oil supply assembly 2 in the above technical scheme also includes a control valve group 25, which has a third variable cylinder 251 and two electromagnetic control valves 252. The third variable cylinder 251 has two oil ports, and the telescopic end of the third variable cylinder 251 is linked to the valve core of the three-position four-way valve 242. The two electromagnetic control valves 252 each have an oil inlet, an oil outlet and a working oil port. The oil inlets of the two electromagnetic control valves 252 are connected to the oil replenishment pipe group 22, and the oil outlets of the two electromagnetic control valves 252 are connected to the oil tank. Each oil port of the third variable cylinder 251 is respectively connected to an oil outlet of the electromagnetic control valve 252, so that the third variable cylinder can be telescoped under the control of the two electromagnetic control valves to control the operating state of the three-position four-way valve, and finally the operating state of the circulating pump is controlled by the second variable cylinder.

[0043] In this embodiment, the oil replenishment pipe group includes an oil supply pump 221, an oil filter 222 and a bypass relief valve 223 arranged at the oil outlet of the oil supply pump 221 (this can avoid oil supply problems caused by oil filter clogging).

[0044] In this embodiment, the four hydraulic drive motors are connected in parallel and then connected to the circulation pump, and the liquid inlets and oil inlets of the four four-way solenoid valves 122 are connected to the oil replenishment pipe group after merging.

[0045] Figure 2 and Figure 3 A1 and B1 represent two working oil ports of the circulation pump, and E1 represents the connection point between the oil replenishment pipe group and the oil inlet of the two-position four-way solenoid valve.

[0046] Example 3

[0047] Same as Example 2, except that Figure 4 and Figure 5 As shown, in the above technical solution, two hydraulic oil supply assemblies 2 are provided, and the four bidirectional variable drive assemblies 1 are equally divided into two groups and correspond one to one to the two hydraulic oil supply assemblies 2. The two hydraulic drive motors 11 in the same group are connected in parallel, and their two working oil ports are respectively connected to the two working oil ports corresponding to the circulating pump 21, and the two oil replenishment pipe groups 22 are connected in series and connected to the oil inlets of the four first variable control components 12, so that each hydraulic oil supply assembly controls two hydraulic drive motors, such as the hydraulic drive motor on the front left side and the hydraulic drive motor on the right rear side are controlled by one hydraulic oil supply assembly, while the hydraulic drive motor on the front right side and the hydraulic drive motor on the left rear side are controlled by another hydraulic oil supply assembly. At this time, the four wheels are cross-controlled, so that the entire sprayer has the functions of going straight, retreating, turning around on the spot or moving horizontally in a crab shape.

[0048] In the above technical solution, the two third variable cylinders 251 are respectively the third variable cylinder A251a and the third variable cylinder B251b. One oil port of the third variable cylinder A251a is connected to one oil port of the third variable cylinder B251b, and the other oil port of the third variable cylinder A251a is connected to the other oil port of the third variable cylinder B251b. In this way, the variable displacement control oil circuits of the two circulating pumps are connected, thereby ensuring that the pressures of the control oil circuits are consistent, which can better ensure that the displacements of the two circulating pumps are the same and the control is more precise.

[0049] Figure 4 and Figure 5 A1 and B1 represent two working oil ports of the circulation pump, and E1 represents the connection point between the oil replenishment pipe group and the oil inlet of the two-position four-way solenoid valve.

[0050] Example 4

[0051] This embodiment provides a sprayer, including the sprayer hydraulic travel system as described in Embodiment 2 or Embodiment 3, which has a simple structure, strong power, and various operating modes.

[0052] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A bidirectional variable drive assembly, characterized in that: The invention comprises a hydraulic drive motor (11), a first variable control component (12), a three-position three-way valve (13) and a first overflow valve (14); the hydraulic drive motor (11) is a bidirectional variable hydraulic motor having a distribution plate and two working oil ports; the first variable control component (12) has an oil inlet, an oil outlet and a drive end, and the drive end is linked with the distribution plate of the hydraulic drive motor (11); the three-position three-way valve (13) has an oil outlet, two working oil ports and two pilot oil ports; one working oil port of the hydraulic drive motor (11) is in communication with one working oil port and one pilot oil port of the three-position three-way valve (13); the other working oil port of the hydraulic drive motor (11) is in communication with the other working oil port and the pilot oil port of the three-position three-way valve (13); the oil outlet of the three-position three-way valve (13) is in communication with the oil tank through the first overflow valve (14).

2. The bidirectional variable drive assembly according to claim 1, characterized in that: The first variable control component (12) comprises a first variable cylinder (121) and a two-position four-way solenoid valve (122); the two-position four-way solenoid valve (122) has an oil inlet, an oil outlet and two working oil outlets; the first variable cylinder (121) has two oil outlets; the two oil outlets of the first variable cylinder (121) correspond to the two working oil outlets of the two-position four-way solenoid valve (122) in a one-to-one manner and are connected to each other; the telescopic end of the first variable cylinder (121) constitutes the driving end of the first variable control component (12); the oil outlet of the two-position four-way solenoid valve (122) constitutes the oil outlet of the first variable control component (12) and is connected to the oil tank; the oil inlet of the two-position four-way solenoid valve (122) constitutes the oil inlet of the first variable control component (12); the driving end of the first variable cylinder (121) is linked to the spring return end of the two-position four-way solenoid valve (122) through a feedback rod.

3. A hydraulic travel system for a sprayer, characterized in that: It comprises a hydraulic oil supply assembly (2) and four bidirectional variable drive assemblies (1) as described in claim 1 or 2, the four hydraulic drive motors (11) and the four first variable control components (12) are all connected to the bidirectional variable drive assembly (1), and the bidirectional variable drive assembly (1) is used to provide a power source for the bidirectional variable drive assembly (1).

4. The hydraulic travel system of the sprayer according to claim 3, characterized in that: The hydraulic oil supply assembly (2) comprises a circulation pump (21) and an oil replenishment pipe group (22). The circulation pump (21) is a bidirectional variable hydraulic pump having two working oil ports. One working oil port of the hydraulic drive motor (11) is connected to one working oil port of the circulation pump (21), and the other working oil port of the hydraulic drive motor (11) is connected to the other working oil port of the circulation pump (21). The oil inlet of the first variable control component (12) is connected to the oil replenishment pipe group (22), and the two working oil ports of the circulation pump (21) are connected to the oil replenishment pipe group (22). Second overflow valves (23) are respectively provided at the connection points. The oil replenishment pipe group (22) is used to take hydraulic oil from the oil tank and apply hydraulic power.

5. The hydraulic travel system of the sprayer according to claim 4, characterized in that: The hydraulic oil supply assembly (2) further comprises a second variable control component (24), the second variable control component (24) having an oil inlet, an oil outlet and a drive end, the circulating pump (21) having a distribution plate, the drive end of the second variable control component (24) being linked to the distribution plate of the circulating pump (21), the oil inlet of the second variable control component (24) being connected to the oil replenishment pipe group (22), and the oil outlet of the second variable control component (24) being connected to the oil tank.

6. The hydraulic travel system of the sprayer according to claim 5, characterized in that: The second variable control component (24) comprises a second variable cylinder (241) and a three-position four-way valve (242); the telescopic end of the second variable cylinder (241) constitutes the driving end of the second variable control component (24); the second variable cylinder (241) has two oil ports; the three-position four-way valve (242) has an oil inlet, an oil outlet and two working oil ports; the two working oil ports of the three-position four-way valve (242) correspond to the two oil ports of the second variable cylinder (241) in one-to-one correspondence and are interconnected; the driving end of the second variable cylinder (241) is also linked to the valve sleeve of the three-position four-way valve (242) via a feedback rod; the oil inlet and the oil outlet of the three-position four-way valve (242) respectively constitute the oil inlet and the oil outlet of the second variable control component (24).

7. The hydraulic travel system of the sprayer according to claim 6, characterized in that: The hydraulic oil supply assembly (2) also includes a control valve group (25), the control valve group (25) having a third variable cylinder (251) and two electromagnetic control valves (252), the third variable cylinder (251) having two oil ports, and the telescopic end of the third variable cylinder (251) is linked to the valve core of the three-position four-way valve (242), the two electromagnetic control valves (252) each having an oil inlet, an oil outlet and a working oil port, the oil inlets of the two electromagnetic control valves (252) are both connected to the oil replenishment pipe group (22), the oil outlets of the two electromagnetic control valves (252) are both connected to the oil tank, and each oil port of the third variable cylinder (251) is respectively connected to an oil outlet of the electromagnetic control valve (252).

8. The hydraulic travel system of the sprayer according to claim 7, characterized in that: The hydraulic oil supply assemblies (2) are provided with two, the four bidirectional variable drive assemblies (1) are equally divided into two groups and correspond one to one with the two hydraulic oil supply assemblies (2), the two hydraulic drive motors (11) in the same group are connected in parallel, and their two working oil ports are respectively connected to the two working oil ports of the corresponding circulating pump (21), and the two oil replenishment pipe groups (22) are connected in series and communicated with the oil inlets of the four first variable control components (12).

9. The hydraulic travel system of the sprayer according to claim 8, characterized in that: The two third variable cylinders (251) are respectively the third variable cylinder A (251a) and the third variable cylinder B (251b), one oil port of the third variable cylinder A (251a) is connected to one oil port of the third variable cylinder B (251b), and the other oil port of the third variable cylinder A (251a) is connected to the other oil port of the third variable cylinder B (251b).

10. A spray machine, characterized in that: It comprises a hydraulic travel system for a sprayer as described in any one of claims 3 to 9.

Images