Unmanned operation equipment and pressure spraying device and pressure balancing method thereof

Abstract

The present invention provides an unmanned operation equipment and a pressure spraying device thereof, and a pressure balancing method implemented by the pressure spraying device. The nozzle assembly of the pressure spraying device includes an axially connected liquid storage cavity, a nozzle and a switch valve; the liquid storage cavity includes a liquid inlet and a liquid outlet for liquid to flow in; the nozzle has a connected input port and a spray port, the nozzle is fixed to the liquid storage cavity and connects the input port with the liquid outlet; the switch valve is fixed to the liquid storage cavity and can movably block the liquid outlet. The switch valve quickly blocks the liquid outlet of the liquid storage cavity, thereby realizing the rapid closure of the nozzle, which can reduce the liquid remaining in the liquid storage cavity from continuing to spray or drip from the nozzle after the pressure pump is turned off. At the same time, the liquid volume space of the liquid storage cavity can be adjusted by the up and down movement of the switch valve, thereby smoothing the pressure pulse of the pressure pump.

Description

Technical Field

[0001] The present invention relates to the technical field of farmland spraying, and in particular to a pressure spraying device and unmanned operation equipment using the spraying device, as well as a pressure balancing method implemented by the pressure spraying device. Background Art

[0002] Currently, drones used in plant protection operations can realize automatic liquid spraying, greatly improving operation efficiency and reducing the harm of pesticides to the human body. However, most of the existing nozzles used in drones have the following defects: when the pressure pump stops working, there is still liquid and residual pressure in the pipeline, and the nozzle continues to spray for a period of time and cannot stop spraying in time, resulting in multiple spraying and heavy spraying during high-speed flight of drones. On the one hand, it causes uneven spraying and waste, and on the other hand, the excessively sprayed liquid will cause damage to crops due to its high concentration. Summary of the invention

[0003] The object of the present invention is to provide a pressure spraying device that overcomes the above technical problems, unmanned operation equipment using the pressure spraying device, and a pressure balancing method implemented by the pressure spraying device.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A pressure spraying device comprises: a liquid storage cavity, a nozzle and a switch valve; the liquid storage cavity comprises a liquid inlet and a liquid outlet for liquid to flow in; the nozzle has a connected input port and a spray port, the nozzle is fixed to the liquid storage cavity and connects the input port with the liquid outlet; the switch valve is fixedly connected to the liquid storage cavity, and the switch valve can movably block the liquid outlet.

[0006] Preferably, the switch valve comprises a driver and a rubber plug connected to the driver and driven by the driver to block the liquid outlet.

[0007] Preferably, the liquid storage cavity, the nozzle and the switch valve are coaxially connected, and the driver and the nozzle are respectively fixed at two ends of the axial direction of the liquid storage cavity.

[0008] Preferably, the driver is provided with a protective shell around its output end, a plurality of sealing rings are arranged at intervals in the protective shell, and the sealing rings are sleeved on the output end.

[0009] Preferably, a pressure sensor is provided at one end of the switch valve facing the liquid storage cavity, and the pressure sensor is used to detect the pressure of the liquid in the liquid storage cavity.

[0010] Preferably, sealing rings are provided near the connection between the liquid storage cavity and the nozzle and the switch valve.

[0011] Preferably, an anti-shock buffer is provided at one end of the switch valve facing the liquid storage cavity, which is used to smooth the pressure impact in the liquid storage cavity when the nozzle assembly is quickly closed.

[0012] Furthermore, the switch valve is provided with a ventilation structure connected with the liquid storage cavity and the outside of the nozzle assembly; the anti-impact buffer includes a first diaphragm, which covers the ventilation structure and can be deformed when the pressure in the liquid storage cavity is too high, and the ventilation structure is used to discharge the gas displaced due to deformation.

[0013] Furthermore, the spraying device also includes a medicine box, a pressure pump, a flow meter, a conduit, and a controller electrically connected to the pressure pump, flow meter and switch valve, which are arranged in sequence, and the conduit is connected to the liquid inlet.

[0014] Furthermore, the spraying device also includes a pressure regulating buffer disposed between the pressure pump and the liquid inlet and connected to the two.

[0015] Preferably, the pressure regulating buffer includes a shell, a second diaphragm, a compression spring, a regulator and a cover body; the two ends of the shell are respectively connected to the flow meter and the pressure pump, a partition is provided in the shell to divide its inner cavity into two, and one side of the shell is provided with openings on both sides of the partition; the second diaphragm is attached to the opening, the cover body is covered on the second diaphragm, the regulator is passed through the cover body and can move relative to the cover body in a direction close to or away from the shell, the compression spring is pressed between the second diaphragm and the regulator, and when the pipeline pressure is greater than the elastic force of the compression spring, the second diaphragm is retracted toward the regulator.

[0016] Furthermore, a buffer pipeline is provided between the liquid inlet and the conduit and is connected to both of them. The buffer pipeline is made of an elastic hose.

[0017] Preferably, a plurality of the nozzles are provided, and the liquid inlet of each nozzle is connected to the conduit through the buffer pipeline.

[0018] As a second aspect, the present invention also relates to an unmanned operation equipment, which includes the above-mentioned pressure spraying device.

[0019] As a third aspect, the present invention also relates to a pressure balancing method implemented by the above-mentioned pressure spraying device, comprising the following steps: detecting the pressure of the liquid in the liquid storage chamber; adjusting the occupancy rate of the liquid in the space in the liquid storage chamber according to the pressure detection result, wherein when the pressure is lower than a predetermined value, the switch valve is driven to move toward the liquid outlet; when the pressure is higher than the predetermined value, the switch valve is driven to move away from the liquid outlet.

[0020] Compared with the prior art, the solution of the present invention has the following advantages:

[0021] 1. The pressure spraying device of the present invention quickly blocks the liquid passage between the liquid storage cavity and the nozzle (specifically, blocks the liquid outlet through a rubber plug) by setting a switch valve, which reduces to a certain extent the situation where the nozzle still sprays or drips liquid outward when other parts of the spraying device have stopped working. When a pressure sensor is provided to detect the pressure of the liquid storage cavity, the valve is opened only when the pressure reaches a set value, realizing the intelligent switch of the spray head assembly.

[0022] 2. The pressure spraying device of the present invention detects the pressure in the liquid storage cavity in real time through the pressure sensor when the nozzle assembly is working, and controls the rubber plug to retract when the pressure is high, thereby increasing the volume that can be loaded with medicine in the cavity; when the pressure is low, the rubber plug is driven to move in the direction close to the liquid outlet, thereby reducing the occupancy rate of the liquid in the cavity and increasing the pressure, thereby smoothing the liquid pressure pulse generated by the pump (such as a diaphragm pump) in the liquid storage cavity to a certain extent, making the atomization of the nozzle assembly more stable.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, which will become obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0025] Figure 1 A schematic structural diagram of a pressure spraying device according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 An exploded view of the pressure spraying device shown;

[0027] Figure 3 A schematic structural diagram of a pressure spraying device according to another embodiment of the present invention;

[0028] Figure 4 for Figure 3 The schematic diagram of the structure of the pressure regulating buffer is shown, in which the arrows indicate the flow direction of the liquid. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0030] Figures 1 to 4The pressure spraying device 1000 of a preferred embodiment of the present invention is shown, which includes a water tank 200, a pressure pump 300, a flow meter 400, a conduit 600, a nozzle assembly 100, and a controller 900 electrically connected to the pressure pump 300, the flow meter 400 and the nozzle assembly 100. The controller 900 closes the nozzle 30 of the nozzle assembly 100 when the pressure of the nozzle assembly 100 is low, and stops spraying liquid outward; when the liquid is sufficient, the nozzle 30 is opened to spray liquid outward, such as liquid medicine. The flow meter 400 is used to detect the flow rate and flow velocity of the pressure pump 300.

[0031] Preferably, the spray head assembly 100 comprises an axially connected liquid storage cavity 20, a nozzle 30 and a switch valve 10. The switch valve 10 is threadedly connected to the liquid storage cavity 20, the nozzle 30 is snap-connected to the liquid storage cavity 20, and the switch valve 10 and the nozzle 30 are respectively arranged at two ends of the axial direction of the liquid storage cavity 20.

[0032] The liquid storage cavity 20 includes a liquid inlet 21 and a liquid outlet 22. The liquid inlet 21 is opened at the upper part of the liquid storage cavity 20, and the liquid outlet 22 is opened at the bottom center of the cavity. The liquid inlet 21 is connected to the conduit so that the liquid can be pumped out from the medicine box by the pressure pump and flow into the liquid storage cavity 20 through the liquid inlet 21. The liquid outlet 22 is preferably arranged in an inverted cone shape.

[0033] The nozzle 30 has an input port 31 and a spray port 32 which are connected. The input port 31 is connected to the liquid outlet 22 near the liquid outlet 22 , and the spray port 32 is used to spray out the liquid entering the nozzle 30 through the input port 31 .

[0034] In another embodiment, no bottom plate is provided at the bottom end of the liquid storage cavity, and the nozzle covers the bottom end of the liquid storage cavity so that the upper part of the nozzle constitutes the bottom of the liquid storage cavity.

[0035] Please combine Figure 3 The switch valve 10 includes a driver 11 and a rubber plug 111 connected to the output end of the driver 11. The driver 11 is electrically connected to the controller 900 and can drive the rubber plug 111 to move linearly to open and close the liquid outlet 22 of the liquid storage cavity 20 according to the instruction of the controller 900. Preferably, the driver is a linear motor with a driving rod (i.e., the output end). The rubber plug 111 is connected to the end of the driving rod of the linear motor and can be driven by the motor to move linearly to block the liquid outlet 22 or open the liquid outlet 22. Preferably, the cross-section of the rubber plug 111 is elliptical, and the length of its major axis is greater than the diameter of the liquid outlet 22.

[0036] Therefore, when the nozzle assembly needs to be closed, the controller outputs a signal to the linear motor, so that the driving rod of the linear motor extends to block the rubber plug 111 at the liquid outlet 22, closes the channel between the liquid outlet 22 and the input port 31, reduces or prevents the liquid from continuing to flow from the liquid storage cavity 20 into the nozzle 30, and realizes the switch function of the nozzle assembly, thereby reducing the liquid remaining in the liquid storage cavity 20 from continuing to spray or drip outward from the nozzle 30. When the nozzle assembly needs to be opened, the output shaft of the driving linear motor is retracted, so that the rubber plug 111 can leave the liquid outlet 22 and open the channel between the liquid outlet 22 and the input port 31.

[0037] Preferably, a pressure sensor 40 is fixed to one end of the switch valve 10 facing the liquid storage cavity 20, and the pressure sensor 40 is electrically connected to the controller for detecting the pressure of the liquid in the liquid storage cavity 20, so that the controller 900 can realize the switch of the nozzle assembly 100 according to the pressure in the liquid storage cavity 20, for example, closing the nozzle 30 when the pressure is low, and opening the nozzle 30 when the pressure is sufficient. In addition, when the nozzle 30 is opened, when the pressure sensor 40 detects a high-pressure pulse (i.e., the pressure exceeds a predetermined range), the driver 11 drives the rubber plug 111 to retract to increase the occupancy rate of the liquid in the liquid storage cavity 20 to the cavity space and smooth the pressure pulse; when a low-pressure pulse is detected (i.e., the pressure pump has pressure fluctuations and the pressure is lower than the predetermined range), the rubber plug 111 is driven to move downward to reduce the occupancy rate of the liquid in the liquid storage cavity 20 to the cavity space and actively increase the pressure.

[0038] Preferably, the driving rod of the linear motor is surrounded by a protective shell, and multiple rings of sealing rings 12 are arranged between the protective shell and the driving rod to prevent liquid from entering the driver 11 along the driving rod and corroding key components of the driver.

[0039] Preferably, a sealing ring is provided near the connection between the liquid storage cavity 20 and the switch valve 10 and the nozzle 30 to prevent liquid from leaking out of the connection.

[0040] In this embodiment, the nozzle 30 and the liquid storage cavity 20 are connected by a snap connection, which facilitates the disassembly, assembly and replacement of the nozzle 30 and the liquid storage cavity 20, for example, replacing nozzles 30 of different sizes and / or forms as needed. In other embodiments, the two can also be fixed by a threaded connection. The switch valve 10 can also be connected to the liquid storage cavity 20 by a snap connection.

[0041] Preferably, an anti-shock buffer 50 is also provided at one end of the switch valve 10 facing the liquid storage chamber 20, which is preferably an elastic buffer, such as a first diaphragm made of elastic material such as rubber, which is used to mitigate the liquid pressure shock in the pipeline when the driver drives the rubber plug 111 to quickly close the nozzle 30.

[0042] Furthermore, the switch valve 10 has a ventilation structure connected to the liquid storage cavity 20 and the outside of the nozzle assembly 100. The first diaphragm covers one end of the ventilation structure facing the liquid storage cavity, and can be deformed and placed in the ventilation structure under the action of pressure when the pressure is higher than a preset range. The ventilation structure is used to discharge the gas displaced by the deformation, so as to smooth the pressure in the liquid storage cavity and / or the pipeline when the nozzle 30 is quickly closed. When the pressure decreases and gradually returns to the normal range, the first diaphragm gradually returns to its original state.

[0043] Please combine Figure 4 Furthermore, the liquid inlet 21 is connected to the conduit 600 by means of a section of elastic buffer line 500, so as to further buffer the pressure pulse at the moment when the nozzle 30 is closed. Specifically, when the nozzle is closed quickly, the pipeline pressure increases instantaneously, causing the elastic buffer line 500 to deform elastically. Based on this, the impact of the pressure at the moment when the nozzle is closed on the pipeline can be reduced by the elastic deformation of the buffer line.

[0044] Furthermore, the pressure spraying device 1000 is provided with a plurality of the spray head assemblies 100 , and each spray head assembly 100 is connected to the conduit 600 through the buffer pipeline 500 .

[0045] Furthermore, a pressure regulating buffer 700 is provided in the main pipeline, specifically between the pressure pump and the flow meter, to smooth the pipeline pressure when the pulse of the pressure pump 300 is large and the nozzle assembly 100 is not sufficient to smooth the pipeline pressure pulse. The pressure regulating buffer 700 is connected to both the pressure pump 300 and the flow meter 400. In other embodiments, the pressure regulating buffer 700 may also be provided at other positions between the pressure pump 300 and the liquid inlet 21. Alternatively, when the nozzle assembly is sufficient to smooth the pulse pressure of the pressure pump, the pressure regulating buffer 700 may not be provided.

[0046] Preferably, the pressure regulating buffer 700 comprises a housing 701 and a cover 703 fixed to the housing 701, a second diaphragm 704 disposed between the housing 701 and the cover 703, a regulator 705 passing through the cover 703, and a compression spring 706 compressed between the second diaphragm 704 and the regulator 705. The regulator 705 can move relative to the cover 703 in a direction close to or away from the housing 701, so as to adjust the deformation of the compression spring 706, thereby controlling the elastic force of the spring.

[0047] The two ends of the shell 701 are connected to the flow meter 400 and the pressure pump 300 respectively. A partition 702 is provided in the shell 701 to divide its inner cavity into two. One side of the shell 701 is provided with openings (not numbered, the same below) on both sides of the partition 702.

[0048] The second diaphragm 704 is attached to the opening and can retract toward the regulator 705 when the pipeline pressure is greater than the elastic force of the compression spring 706, so that the second diaphragm 704 elastically opens or blocks the opening on the housing 701 to adapt to the pipeline pressure. When the pipeline pressure is low (pressure is less than the elastic force), the second diaphragm 704 is attached to the housing 701 under the elastic force of the compression spring 706 to close the pipeline; when the pipeline pressure is high (pressure is greater than the elastic force), the pressure of the liquid causes the diaphragm 704 to retract toward the regulator 705 to open the pipeline. In the pipeline conduction state, the pressure pulse of the pressure pump is smoothed by the elastic deformation of the spring, so that the liquid pressure after passing through the pressure regulating buffer 700 tends to be stable and smooth.

[0049] As a second aspect, the present invention also relates to an unmanned operation equipment (not shown), such as a plant protection drone, which has the above-mentioned pressure spraying device 100, which can quickly close the nozzle assembly when the pressure pump is turned off, thereby reducing the continued spraying or dripping of liquid remaining in the liquid storage cavity and ensuring the spraying operation effect.

[0050] As a third aspect, the present invention also relates to a pressure balancing method, which is implemented by the above-mentioned pressure spraying device. It mainly comprises the following steps:

[0051] The pressure of the liquid in the liquid storage cavity is detected by a pressure sensor, and the detection result is sent to the controller.

[0052] The controller 900 drives the rubber plug to move according to the result of the pressure detection, adjusts the occupancy rate of the cavity space of the liquid storage cavity 20, and further adjusts the pressure of the liquid.

[0053] When a low-pressure pulse is detected, that is, the pressure is lower than a predetermined value, the driver drives the rubber plug to move downward (that is, move in the direction closer to the liquid outlet), thereby reducing the occupancy rate of the liquid in the liquid storage cavity 20 to the cavity space, and actively increasing the pressure; when a high-pressure pulse is detected, that is, the pressure is higher than a predetermined value, the driver drives the rubber plug to move upward, increasing the occupancy rate of the liquid to the cavity space of the liquid storage cavity 20, thereby reducing the liquid pressure, thereby keeping the pressure of the liquid in the liquid storage cavity 20 as stable as possible.

[0054] The above descriptions are only some embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A pressure spraying device, comprising a spray head assembly, characterized in that: The nozzle assembly includes: a liquid storage cavity, a nozzle and a switch valve; the pressure spraying device also includes a controller electrically connected to the nozzle assembly; The liquid storage cavity comprises a liquid inlet and a liquid outlet for liquid to flow in; The nozzle has an input port and a spray port that are connected to each other, and the nozzle is fixed to the liquid storage cavity so that the input port is connected to the liquid outlet; The switch valve is fixedly connected to the liquid storage cavity, and the switch valve can movably block the liquid outlet; the switch valve includes a driver and a rubber plug connected to the output end of the driver, and the driver is connected to the controller to drive the rubber plug to move according to the instruction of the controller to open and close the liquid outlet of the liquid storage cavity; A pressure sensor is provided at one end of the switch valve facing the liquid storage cavity, and the pressure sensor is used to detect the pressure of the liquid in the liquid storage cavity. The controller controls the switch of the nozzle assembly according to the pressure in the liquid storage cavity.

2. The pressure spraying device according to claim 1, characterized in that: When the pressure sensor detects a high-voltage pulse, the driver drives the rubber plug to retract, thereby increasing the occupancy rate of the liquid in the liquid storage cavity to the cavity space; When the pressure sensor detects a low-pressure pulse, the driver drives the rubber plug to move downward, thereby reducing the occupancy rate of the cavity space of the liquid in the liquid storage cavity.

3. The pressure spraying device according to claim 2, characterized in that: The liquid storage cavity, the nozzle and the switch valve are coaxially connected, and the driver and the nozzle are respectively fixed at two ends of the axial direction of the liquid storage cavity.

4. The pressure spraying device according to claim 3, characterized in that: The driver is provided with a protective shell around its output end, a sealing ring is provided inside the protective shell, and the sealing ring is sleeved on the output end.

5. The pressure spraying device according to claim 3, characterized in that: An anti-shock buffer is provided at one end of the switch valve facing the liquid storage cavity, which is used to smooth the pressure impact in the liquid storage cavity when the nozzle assembly is quickly closed.

6. The pressure spraying device according to claim 5, characterized in that: The switch valve is provided with a ventilation structure communicating with the liquid storage cavity and the outside of the spray head assembly; The anti-shock buffer includes a first diaphragm, which covers the ventilation structure and can be deformed when the pressure in the liquid storage cavity is too high. The ventilation structure is used to discharge the gas displaced by the deformation.

7. The pressure spraying device according to claim 3, characterized in that: Sealing rings are respectively arranged near the connection between the liquid storage cavity and the nozzle and the switch valve.

8. The pressure spraying device according to any one of claims 1 to 7, characterized in that: It also includes a medicine box, a pressure pump, a flow meter, a catheter, and a controller electrically connected to the pressure pump, the flow meter, and the switch valve respectively, and the catheter is connected to the liquid inlet.

9. The pressure spraying device according to claim 8, characterized in that: It also includes a pressure regulating buffer which is arranged between the pressure pump and the liquid inlet and is in communication with the two.

10. The pressure spraying device according to claim 9, characterized in that The pressure regulating buffer comprises a housing, a second diaphragm, a compression spring, a regulator and a cover; The two ends of the shell are respectively connected to the flow meter and the pressure pump, a partition is provided in the shell to divide the inner cavity into two, and one side of the shell is provided with openings on both sides of the partition; The second diaphragm is fitted to the opening, the cover body is covered on the second diaphragm, the regulator is passed through the cover body and can move relative to the cover body in a direction close to or away from the shell, the compression spring is pressed between the second diaphragm and the regulator, and the second diaphragm is retracted toward the regulator when the pipeline pressure is greater than the elastic force of the compression spring.

11. The pressure spraying device according to claim 8, characterized in that: The liquid inlet of the spray head assembly is communicated with the conduit through an elastic buffer pipeline.

12. An unmanned operation equipment, characterized in that: A pressure spraying device comprising any one of claims 1 to 11.

13. A pressure balancing method implemented by the pressure spraying device according to any one of claims 1 to 11, characterized in that: The following steps are involved: Detecting the pressure of the liquid in the liquid storage chamber; The occupancy rate of the liquid in the space of the liquid storage chamber is adjusted according to the pressure detection result, wherein when the pressure is lower than a predetermined value, the switch valve is driven to move toward the liquid outlet; when the pressure is higher than the predetermined value, the switch valve is driven to move away from the liquid outlet.

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