Boom folding hydraulic control system for a boom sprayer

Abstract

The boom spraying machine folding hydraulic control system comprises a master control valve, a left folding arm cylinder group, a right folding arm cylinder group, a horizontal cylinder, a locking cylinder, a lifting cylinder group, a two-way hydraulic lock, a sequence valve, a sub-control valve a, a sub-control valve b, a sub-control valve c and a sub-control valve d. The master control valve is connected with a hydraulic oil tank, the input port and the oil return port of the hydraulic oil tank are connected with the master control valve, the pressure oil is input into the master control valve from the P port, and the oil return of the whole system flows back to the tank from the T port. The master control valve is connected with each sub-control valve to provide hydraulic oil for each sub-control valve. The left folding arm cylinder group, the right folding arm cylinder group, the horizontal cylinder, the locking cylinder and the lifting cylinder group are respectively provided with the sub-control valve on the pipeline connected with the master control valve. The application can be embedded in the process of folding arm two-side opening or closing and single-side arm folding of the boom spraying machine requiring hydraulic control.

Description

Technical Field

[0001] This invention relates to the field of boom sprayer equipment, and in particular to a hydraulic control system for boom folding of a boom sprayer. Background Technology

[0002] During the growth period, crops often encounter pests and diseases. To prevent these pests and diseases, people frequently use field boom sprayers to spray pesticides onto the crops. Traditional boom sprayers often use a wide-width folding boom structure. To improve operational efficiency, increasingly wider spray widths are being used in boom sprayers. As the spray width increases, the folding arms on both sides used to mount the boom become wider when unfolded. In actual operation, due to obstacles in the field, such as large trees, utility poles, or the bottom of steep slopes, if it is still necessary to spray the crops, it may be necessary to retract one side of the boom sprayer to avoid obstacles and not interfere with the spraying operation. During normal operation, the wide folding boom of the boom sprayer opens and closes synchronously on both the left and right sides. This ensures left-right balance during the closing process and prevents lateral deviation. However, when encountering obstacles, it needs to be folded on one side. Traditional boom sprayers cannot achieve the hydraulic automatic control process for folding on one side. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a hydraulic control system for folding booms of a boom sprayer, which can realize the automatic synchronous opening and closing of the booms on both sides of the boom sprayer and realize the working state of spraying with one boom.

[0004] To solve the above technical problems, the present invention is implemented in the following manner: The boom folding hydraulic control system of the boom sprayer of the present invention includes a main control valve, a left boom cylinder group, a right boom cylinder group, a horizontal cylinder, a locking cylinder, a lifting cylinder group, a two-way hydraulic lock, a sequence valve and a sub-control valve;

[0005] The main control valve is connected to the hydraulic oil tank, and the inlet and outlet of the hydraulic oil tank are respectively connected to the main control valve; the main control valve is connected to each sub-control valve to provide hydraulic oil to the sub-control valves;

[0006] A sub-control valve is installed on the pipeline connecting the left arm cylinder group to the main control valve, and a two-way hydraulic lock is installed between the sub-control valve and the left arm cylinder group.

[0007] A sub-control valve is installed on the pipeline connecting the right arm cylinder group to the main control valve, and a two-way hydraulic lock is installed between the sub-control valve and the right arm cylinder group.

[0008] A sub-control valve is installed on the pipeline connecting the horizontal cylinder and the main control valve, and a two-way hydraulic lock is installed between the sub-control valve and the horizontal cylinder.

[0009] A sub-control valve is installed on the pipeline connecting the oil circuit interface of one end of the locking cylinder to the main control valve, and a two-way hydraulic lock is installed between the sub-control valve and the locking cylinder; the other end of the locking cylinder is connected to the sequence valve through a pipeline, and the sequence valve is connected to the main control valve through a pipeline.

[0010] A sub-control valve is installed on the pipeline connecting the lifting cylinder assembly and the main control valve, and a two-way hydraulic lock is installed between the sub-control valve and the lifting cylinder assembly.

[0011] The positive effects of this invention:

[0012] This invention discloses a hydraulic control system for the boom folding mechanism of a boom sprayer, which solves the problem that traditional boom sprayers cannot achieve automatic hydraulic control of single-sided folding. This invention can be embedded in boom sprayers requiring hydraulic control for simultaneous opening or closing of both sides of the folding arm, or for single-sided arm folding during spraying. Because it employs a structure where the balance frame locking seat and the balance frame are mutually locked, the horizontal position of the boom after single-sided folding is hydraulically adjusted, and the adjustment process is stable and reliable. This invention makes boom sprayers suitable for more complex environments, such as spraying environments requiring single-sided arm folding for operation, thus expanding the working range of boom sprayers. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a schematic diagram of the hydraulic control system of the present invention.

[0015] Figure 2 This is a partial schematic diagram of the mechanical structure controlled by the hydraulic system control system.

[0016] Figure 3 This is a partial schematic diagram showing the hydraulic system controlling the locking cylinder to lock the balance frame.

[0017] The components are as follows: 1. Sequence valve; 2. Main control valve; 3. Two-way hydraulic lock; 4. Sub-control valve a; 5. Sub-control valve b; 6. Sub-control valve c; 7. Sub-control valve d; 8. Main frame; 9. Left extension arm; 10. Left extension arm cylinder assembly; 11. Balance frame; 12. Horizontal cylinder; 13. Two-way damper; 14. Right extension arm cylinder assembly; 15. Right extension arm; 16. Rotary shaft; 17. Locking cylinder; 18. Locking block; 19. Balance frame locking seat. Detailed Implementation

[0018] As a specific embodiment of the present invention, such as Figure 1As shown, the boom folding hydraulic control system of the boom sprayer of the present invention includes a main control valve 2, a left boom cylinder group 10, a right boom cylinder group 14, a horizontal cylinder 12, a locking cylinder 17, a lifting cylinder group, a two-way hydraulic lock 3, a sequence valve 1, a sub-control valve a4, a sub-control valve b5, a sub-control valve c6, and a sub-control valve d7.

[0019] The main control valve 2 is connected to the hydraulic oil tank. The inlet and outlet of the hydraulic oil tank are connected to the main control valve 2 respectively. Pressurized oil is input from the P port to the main control valve 2, and the return oil of the entire system flows back to the oil tank from the T port. The main control valve 2 is connected to each sub-control valve to provide hydraulic oil to each sub-control valve.

[0020] A sub-control valve a4 is installed on the pipeline connecting the left boom cylinder group 10 and the main control valve 2, and a two-way hydraulic lock 3 is installed between the sub-control valve a4 and the left boom cylinder group 10.

[0021] A sub-control valve d7 is installed on the pipeline connecting the right arm cylinder group 14 and the main control valve 2, and a two-way hydraulic lock 3 is installed between the sub-control valve d7 and the right arm cylinder group 14.

[0022] A sub-control valve b5 is installed on the pipeline connecting the horizontal cylinder 12 and the main control valve 2, and a two-way hydraulic lock 3 is installed between the sub-control valve b5 and the horizontal cylinder 12.

[0023] A sub-control valve c6 is installed on the pipeline connecting the oil circuit interface of one end of the locking cylinder 17 to the main control valve 2. A two-way hydraulic lock 3 is installed between the sub-control valve c6 and the locking cylinder 17. The other end of the locking cylinder 17 is connected to the sequence valve 1 through a pipeline. The sequence valve 1 is connected to the main control valve 2 through a pipeline.

[0024] A sub-control valve c6 is installed on the pipeline connecting the lifting cylinder assembly and the main control valve 2, and a two-way hydraulic lock 3 is installed between the sub-control valve c6 and the lifting cylinder assembly.

[0025] like Figure 2 , Figure 3 As shown, the left extension arm 9 and the right extension arm 15 are connected to both sides of the balance frame 11 and form a rotatable connection with both sides of the balance frame 11. Since the left extension arm 9 and the right extension arm 15 each include several segments of extension arms that can be opened or folded back individually, the opening or closing of the left extension arm 9 and the right extension arm 15 is achieved by several cylinders included in the left extension arm cylinder group 10 and the right extension arm cylinder group 14, respectively.

[0026] A rotating shaft 16 is fixed at the center of the upper end of the balance frame 11. The balance frame 11 is rotatably connected to the main frame 8 through the rotating shaft 16, meaning that the balance frame 11 can swing around the rotating shaft 16. The upper end of the balance frame locking seat 19 is sleeved on the rotating shaft 16 and is rotatably connected to the rotating shaft 16. A slot is provided at the middle of the lower end of the balance frame locking seat 19. The bottom of the locking block is rotatably connected to the main frame 8, and a locking hammer is provided at the top. After the locking cylinder 17 controls the locking block 18 to rotate, the locking hammer can be locked in the slot, restricting the swing of the balance frame locking seat 19. One end of the bidirectional damper 13 is hinged to the main frame 8, and the other end is hinged to the lower end of the balance frame locking seat 19. One end of the horizontal cylinder 12 is hinged to the lower end of the balance frame locking seat 19. The other end is hinged to the lower crossbeam of the balance frame 11; the horizontal cylinder 12 and the bidirectional damper 13 are respectively set on both sides of the balance frame locking seat 19; when the locking cylinder 17 controls the locking hammer to engage in the slot, the balance frame locking seat 19 will not be able to swing left and right. At this time, since the balance frame 11 and the balance frame locking seat 19 are connected by the horizontal cylinder 12, the balance frame 11 will also be in a locked state; by changing the extension length of the cylinder rod of the horizontal cylinder 12, the horizontal position of the balance frame 11 can be adjusted. During the adjustment process, due to the presence of the bidirectional damper, the adjustment becomes slow, so that the left arm 9 or the right arm 15 in the single-sided unfolded state will not touch the ground due to the rapid adjustment of the horizontal position of the balance frame 11.

[0027] A hydraulic control method for boom folding of a boom sprayer, the method being based on a boom folding hydraulic control system, comprising the following steps:

[0028] 1) Synchronous deployment of the boom sprayer's two boom arms: Pressurized oil flows out from port A of main control valve 2, and under the action of sub-control valves a4 and d7, enters pipelines A4 and A1 respectively, driving the piston rods of the left boom cylinder group 10 and the right boom cylinder group 14 to extend outwards respectively. Driven by the piston rods, the left and right boom arms open synchronously; the return oil paths of the left boom cylinder group 10 and the right boom cylinder group 14 flow from pipelines B1 and B4 through the main control valve 2 circuit B and then return to the oil tank through port T; during the boom extension process, under the action of sub-control valve c6, pipeline B2 is in a state of connection with the main control valve 2 circuit B; due to the sequence valve 1 being set There is an opening pressure value, meaning that the flow from the V end to the C end of the sequence valve 1 requires the pressure in the pipeline to reach the opening pressure value. Therefore, the sequence valve 1 is not open during the arm extension process, meaning that the locking cylinder 17 is still locked to both arms during the arm extension process. After the arm extension action is completed, the pressure in the pipeline will gradually increase and reach the opening pressure of the V end of the sequence valve 1. Then, the hydraulic oil flows from the V end through the sequence valve 1 and then from the C end of the sequence valve 1 into the locking cylinder 17. The piston cylinder of the locking cylinder 17 retracts, controlling the locking hammer to leave the slot, thereby unlocking the arm. After unlocking, the symmetrically arranged boom sprayers on both sides enter a self-balancing working state.

[0029] 2) Synchronous retraction process of the boom sprayer's two arms: By controlling the main control valve 2, the pressurized oil supplied by the hydraulic oil tank flows out from port B of the main control valve 2 pipeline. Under the action of the sub-control valves a4, c6 and d7, it enters pipelines B4, B2 and B1 respectively. At this time, since the driving pressure required for the locking cylinder 17 is relatively small, that is, the sequence valve 1 does not need to meet the opening pressure value of port V, the hydraulic oil can flow from end C to end V. Therefore, under the drive of the hydraulic oil, the locking cylinder 17 first controls the locking hammer to engage in the slot, completing the mechanical locking of the boom. Then, after the internal pressure of the left boom cylinder group 10 and the right boom cylinder group reaches the retraction state, the boom begins to retract synchronously to the end. During the retraction process, the return oil pipeline A4 of the left boom cylinder group 10 and the return oil pipeline A1 of the right boom cylinder group are connected to port A of the main control valve 2 through sub-control valves a4 and d7 respectively, and return to the oil tank through port A of the main control valve 2.

[0030] 3) Preparation process for single-sided boom operation: First, open both booms simultaneously according to step 1); then control the control valve on the side of the boom that does not need to be folded to the neutral position, where the oil circuit is blocked. At this time, the hydraulic oil in the cylinder group 10 of the left boom or the cylinder group of the right boom on the side that does not need to be folded cannot flow in the cylinder body and is in a locked state; then wait for the boom on the folding side to retract according to step 2), until the left boom 9 or the right boom 15 folds back to the required working state. Throughout the process, the locking cylinder 17 continuously controls the locking hammer to engage in the slot, locking the balance frame 11; finally, by changing the extension length of the cylinder rod of the horizontal cylinder 12, the horizontal position of the balance frame 11 can be adjusted. After the horizontal position of the balance frame 11 is adjusted, single-sided boom spraying operation can be carried out.

[0031] It is important to note that when single-arm deployment is required, both arms must be deployed first before folding and retracting the single arm. This is because if single-arm deployment begins from the folded state, following step 1), once the single arm is fully deployed, locking cylinder 17 will automatically unlock, causing the machine to suddenly become unbalanced and easily leading to accidents such as tipping over or the deployed side touching the ground. After single-arm spraying is completed, when retracting the arm, the other undeployed arm must be deployed first to achieve double-arm deployment. After adaptive leveling, the double-arm retraction can then be achieved through the retraction process. A two-way hydraulic lock 3 is installed, which utilizes the characteristic that the two-way hydraulic lock 3 remains locked when its two sides are depressurized, thus ensuring safety during the system's hydraulic control process.

[0032] It should be specifically noted that the above description is merely a preferred embodiment of the device structure of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, alterations, and equivalent changes made to the above examples based on the core technology of the present invention shall still fall within the technical scope of the present invention and shall be protected by the patent of the present invention.

Claims

1. A hydraulic control system for folding boom of a boom sprayer, characterized in that: Includes main control valve, left arm cylinder group, right arm cylinder group, horizontal cylinder, locking cylinder, lifting cylinder group, two-way hydraulic lock, sequence valve, sub-control valve a, sub-control valve b, sub-control valve c, and sub-control valve d. The main control valve is connected to the hydraulic oil tank. The inlet and outlet of the hydraulic oil tank are connected to the main control valve, respectively. Pressurized oil is input to the main control valve from the P port, and the return oil of the entire system flows back to the oil tank from the T port. The main control valve is connected to each sub-control valve to provide hydraulic oil to each sub-control valve. A sub-control valve a is installed on the pipeline connecting the left arm cylinder group to the main control valve, and a two-way hydraulic lock is installed between the sub-control valve a and the left arm cylinder group. A sub-control valve d is installed on the pipeline connecting the right arm cylinder group to the main control valve, and a two-way hydraulic lock is installed between the sub-control valve d and the right arm cylinder group. A sub-control valve b is installed on the pipeline connecting the horizontal cylinder and the main control valve, and a two-way hydraulic lock is installed between the sub-control valve b and the horizontal cylinder. A sub-control valve c is installed on the pipeline connecting the oil circuit interface of one end of the locking cylinder to the main control valve. A two-way hydraulic lock is installed between the sub-control valve c and the locking cylinder. The other end of the locking cylinder is connected to the sequence valve through a pipeline, and the sequence valve is connected to the main control valve through a pipeline. A sub-control valve c is installed on the pipeline connecting the lifting cylinder assembly and the main control valve, and a two-way hydraulic lock is installed between the sub-control valve c and the lifting cylinder assembly. The left and right extension arms are connected to both sides of the balance frame, forming a rotatable connection with both sides of the balance frame; a rotating shaft is fixed at the center of the upper end of the balance frame, and the balance frame is rotatably connected to the main frame through the rotating shaft; the upper end of the balance frame locking seat is sleeved on the rotating shaft, forming a rotatable connection with the rotating shaft, and a slot is provided at the middle of the lower end of the balance frame locking seat; the bottom of the locking block is rotatably connected to the main frame, and a locking hammer is provided at the top; after the locking block is rotated by the locking cylinder, the locking hammer can be locked in the slot, restricting the swing of the balance frame locking seat; one end of the bidirectional damper is hinged to the main frame, and the other end is hinged to the lower end of the balance frame locking seat; one end of the horizontal cylinder is hinged to the lower end of the balance frame locking seat. One end forms a hinge connection, and the other end forms a hinge connection with the lower crossbeam of the balance frame; the horizontal cylinder and the bidirectional damper are respectively set on both sides of the balance frame locking seat; when the locking cylinder controls the locking hammer to engage in the slot, the balance frame locking seat will not be able to swing left and right. At this time, since the balance frame and the balance frame locking seat are connected by the horizontal cylinder, the balance frame will also be in a locked state; by changing the extension length of the cylinder rod of the horizontal cylinder, the horizontal position of the balance frame can be adjusted. During the adjustment process, due to the presence of the bidirectional damper, the adjustment becomes slow, so that the left arm or right arm in a single-sided unfolded state will not touch the ground due to rapid adjustment of the horizontal position of the balance frame.

2. A hydraulic control method for boom folding of a boom sprayer, the method being based on a boom folding hydraulic control system for the boom sprayer, comprising the following steps: 1) Synchronous deployment of the boom sprayer's two boom arms: Pressurized oil flows out from port A of the main control valve, and under the action of sub-control valves a and d, enters pipelines A4 and A1 respectively, driving the piston rods of the left and right boom cylinder assemblies to extend outwards. Driven by the piston rods, the left and right boom arms open synchronously. The return oil paths of the left and right boom cylinder assemblies flow from pipelines B1 and B4 through the main control valve circuit B and then back to the oil tank through port T. During the boom extension process, under the action of sub-control valve c, pipeline B2 is connected to the main control valve circuit B. Due to the sequence valve being set with an opening... The opening pressure value, that is, the flow from the V end to the C end of the sequence valve, requires the pressure in the pipeline to reach the opening pressure value. Therefore, the sequence valve is not open during the arm extension process, that is, the locking cylinder is still in the locked state of both arms during the arm extension process. After the arm extension action is completed, the pressure in the pipeline will gradually increase and reach the opening pressure of the V end of the sequence valve. Then, the hydraulic oil flows from the V end through the sequence valve and then from the C end of the sequence valve into the locking cylinder. The piston cylinder of the locking cylinder retracts, controlling the locking hammer to leave the slot, thereby unlocking the arm. After unlocking, the symmetrically arranged boom sprayer arms on both sides enter the self-balancing working state. 2) Synchronous retraction process of the boom sprayer's two booms: By controlling the main control valve, the pressurized oil supplied by the hydraulic oil tank flows out from port B of the main control valve pipeline. Under the action of sub-control valves a, c, and d, it enters pipelines B4, B2, and B1 respectively. At this time, since the driving pressure required by the locking cylinder is relatively small, that is, the sequence valve does not need to meet the opening pressure value of port V, the hydraulic oil can flow from end C to end V. Therefore, under the drive of the hydraulic oil, the locking cylinder first controls the locking hammer to engage in the slot, completing the mechanical locking of the boom. Then, after the internal pressure of the left boom cylinder group and the right boom cylinder group reaches the retraction state, the boom begins to retract synchronously to the end. During the retraction process, the return oil pipeline A4 of the left boom cylinder group and the return oil pipeline A1 of the right boom cylinder group are connected to port A of the main control valve through sub-control valves a and d respectively, and return to the oil tank through port A of the main control valve. 3) Preparation process for single-sided boom operation: First, open both booms simultaneously as per step 1). Then, control the control valve on the side of the boom that does not need to be folded to the neutral position, where the oil circuit is blocked. At this time, the hydraulic oil in the cylinder group of the left or right boom on the side that does not need to be folded cannot flow in the cylinder and is locked. Then, wait for the boom on the folding side to retract as per step 2), until the left or right boom returns to the required working state. Throughout the process, the locking cylinder continuously controls the locking hammer to engage in the slot, locking the balance frame. Finally, by changing the extension length of the cylinder rod of the horizontal cylinder, the horizontal position of the balance frame can be adjusted. Once the horizontal position of the balance frame is adjusted, single-sided boom spraying can be carried out.

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