Automatic steering control valve group

Abstract

The utility model relates to an automatic steering control valve group, which comprises a steering valve main body, which is provided with a hydraulic flow channel, and the hydraulic flow channel is used for hydraulic fluid to enter and transmitting hydraulic energy; the electric proportional pressure reducing valve is fixedly arranged on the conversion valve main body, is connected with the hydraulic flow channel, and is used for receiving a control electric signal of the unmanned tractor and adjusting the flow according to the control electric signal; and the priority flow valve is fixedly arranged on the conversion valve main body, is connected with the hydraulic flow channel, and is used for receiving a flow feedback signal of the unmanned tractor and adjusting the pressure of the hydraulic flow channel. The hydraulic valve group has the effect that the hydraulic valve group has two operation modes of automatic control and manual control when a hydraulic system of the unmanned tractor is refitted.

Description

Technical Field

[0001] This application relates to the field of agricultural machinery and equipment technology, and in particular to an automatic steering control valve assembly. Background Technology

[0002] Currently, there is a strong demand from farms and farmers for the conversion of tractors to driverless operation, especially for tractors used for loading goods. After the tractors are converted to driverless operation, they can be located by satellite and remotely operated, which has the advantage of being able to carry out corresponding operations at night.

[0003] In related technologies, the hydraulic control system of a tractor is an important component for the operation control of the tractor. When improving the hydraulic control valve group of the hydraulic control system, or when carrying out unmanned driving conversion, the hydraulic control system needs to be modified accordingly.

[0004] In response to the aforementioned technologies, when modifying a hydraulic control system, in order to maintain the original manual control, it is necessary to design a corresponding hydraulic control valve group for matching, so as to maintain both automatic and manual control hydraulic valve group operation modes. Utility Model Content

[0005] In order to maintain the hydraulic valve assembly with both automatic and manual control operating modes, this application provides an automatic steering control valve assembly.

[0006] The automatic steering control valve assembly provided in this application adopts the following technical solution:

[0007] An automatic steering control valve assembly includes:

[0008] The main body of the steering valve has a hydraulic flow channel, through which hydraulic fluid enters and transmits hydraulic energy.

[0009] An electro-proportional pressure reducing valve is fixedly mounted on the steering valve body and connected to the hydraulic flow channel. It is used to receive control electrical signals from the unmanned tractor and to adjust the flow rate according to the control electrical signals.

[0010] A priority flow valve is fixedly mounted on the steering valve body. The priority flow valve is connected to the hydraulic flow channel and is used to receive the flow feedback signal from the unmanned tractor and adjust the pressure of the hydraulic flow channel.

[0011] By adopting the above technical solution, the electro-proportional pressure reducing valve realizes automatic control of the hydraulic system under the control signal issued by the unmanned tractor, so that hydraulic energy can be transmitted through the corresponding hydraulic flow channel. The hydraulic flow channel can be controlled by the manual operation control hydraulic system on the tractor. Thus, the hydraulic system of the unmanned tractor has two modes: automatic control and manual control. At the same time, the priority flow regulating valve can adjust the flow according to the feedback, increasing the stability of the hydraulic system.

[0012] Optionally, the steering valve body is also provided with a balance valve, which is connected between the hydraulic flow channel and the oil cylinder on the unmanned tractor to balance the load pressure of the oil cylinder.

[0013] By adopting the above technical solution, the setting of the balance valve allows the pressure in the hydraulic channel to be adjusted accordingly, thereby maintaining the hydraulic transmission between the cylinder and the hydraulic channel of the unmanned tractor in a balanced manner and preventing large fluctuations.

[0014] Optionally, the steering valve body is also fixedly provided with an overflow valve, which is connected to the hydraulic flow channel and is used to adjust the pressure input to the hydraulic flow channel.

[0015] By adopting the above technical solution, the relief valve can alleviate and regulate the pressure when there are large changes in the pressure in the hydraulic flow channel. This makes it less likely that large pressure changes in the hydraulic flow channel will affect the safety of the connected body, thus helping to improve the safety of use.

[0016] Optionally, the steering valve body is further provided with a shuttle valve, which is connected to the priority flow valve and is used to control the pressure entering the priority flow valve.

[0017] By adopting the above technical solution, the shuttle valve is designed so that when hydraulic energy enters the priority flow valve through the shuttle valve, the flow rate can be detected and a feedback signal can be generated. Thus, the priority flow valve can automatically adjust the flow rate according to the feedback signal to maintain a stable flow transmission in the hydraulic channel.

[0018] Optionally, the hydraulic passage is provided with a P port, a T port, an A port, a B port, an E port, and an F port. The P port is connected to the steering oil source of the unmanned tractor, the T port is connected to the hydraulic oil tank of the unmanned tractor, the A port and the B port are respectively connected to the steering cylinder of the unmanned tractor, and the E port and the F port are connected to the steering gear of the unmanned tractor.

[0019] By adopting the above technical solution, the hydraulic flow channel is opened with corresponding oil ports so that the hydraulic system on the unmanned tractor can be connected to the steering valve body as needed, which facilitates the hydraulic control and adjustment of the corresponding valve body.

[0020] Optionally, the maximum input flow rate of the hydraulic channel is 70-76 LPM.

[0021] By adopting the above technical solution, the input flow requirements within a certain range can be met under the limitation of the maximum input flow range. Compared with a single maximum input flow value, it can increase the adaptability of hydraulic systems of different specifications.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. The electro-proportional pressure reducing valve realizes automatic control of the hydraulic system under the control signal issued by the unmanned tractor, so that hydraulic energy can be transmitted through the corresponding hydraulic flow channel, and the hydraulic flow channel can be controlled by the manual operation control hydraulic system on the tractor. Thus, the hydraulic system of the unmanned tractor has two modes: automatic control and manual control.

[0024] 2. The setting of the balance valve allows the pressure in the hydraulic flow channel to be adjusted accordingly, thereby maintaining the hydraulic transmission between the cylinder and the hydraulic flow channel of the unmanned tractor in a balanced manner and preventing large fluctuations.

[0025] 3. The relief valve is designed to alleviate and regulate the pressure when there are significant changes in the pressure within the hydraulic flow channel, thus preventing the hydraulic flow channel from being affected by large pressure changes and ensuring the safe operation of the connected unit. Attached Figure Description

[0026] Figure 1 This is a side view of the overall structure of the automatic steering control valve assembly in this application.

[0027] Figure 2 This is a top view of the automatic steering control valve assembly in this application.

[0028] Figure 3 This is a left view of the automatic steering control valve assembly in this application.

[0029] Explanation of reference numerals in the attached diagram: 1. Steering valve body; 11. Hydraulic flow channel; 111. P port; 112. T port; 113. A port; 114. B port; 115. E port; 116. F port; 2. Electro-proportional pressure reducing valve; 3. Priority flow valve; 4. Balance valve; 5. Relief valve; 6. Shuttle valve. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses an automatic steering control valve assembly. (Refer to...) Figure 1The automatic steering control valve group is applied to the steering hydraulic control system of the unmanned tractor. It includes a steering valve body 1, an electro-proportional pressure reducing valve 2, and a priority flow valve 3. The electro-proportional pressure reducing valve 2 and the priority flow valve 3 are both fixedly mounted on the connecting generator body. The connecting generator body has corresponding hydraulic flow channels 11 for connecting the electro-proportional pressure reducing valve 2 and the priority flow valve 3. The unmanned tractor can automatically control the electro-proportional pressure reducing valve 2 by sending control electrical signals, thereby realizing the automatic control and adjustment of the hydraulic system. At the same time, it will not affect the original manual hydraulic control operation of the steering valve body 1, thus maintaining the manual and automatic adjustment modes of the unmanned tractor.

[0032] Reference Figures 1-3 The hydraulic flow channel 11 has multiple oil ports for connecting to the steering hydraulic control system on the unmanned tractor. Specifically, these ports include P port 111, T port 112, A port 113, B port 114, E port 115, and F port 116. P port 111 connects to the steering oil source of the unmanned tractor, T port 112 connects to the hydraulic oil tank of the unmanned tractor, A port 113 and B port 114 connect to the steering cylinder of the unmanned tractor, and E port 115 and F port 116 connect to the steering gear of the unmanned tractor. There are spare oil ports with plugs for use as pressure testing ports when needed. The electro-proportional pressure reducing valve 2 controls the flow rate in the pipeline by controlling the current, thereby controlling the speed of the steering cylinder. Furthermore, in this embodiment, the maximum input flow rate into the hydraulic flow channel 11 has a certain range, specifically 70-76 LPM (70 to 76 liters per minute), to meet the hydraulic flow requirements within this range.

[0033] Reference Figure 1 The steering valve body 1 is also equipped with a balance valve 4, a relief valve 5, and a shuttle valve 6. The balance valve 4 is connected between the hydraulic flow channel 11 and the hydraulic cylinder on the unmanned tractor. When oil is input into the cylinder, the balance valve 4 balances and regulates the pressure of the oil source. The relief valve 5 is fixedly connected to the steering valve body 1 and also connected to the hydraulic flow channel 11, so that when a higher pressure oil source enters the hydraulic flow channel 11, it can be buffered and regulated, thereby protecting the hydraulic flow channel 11. After being installed and fixed to the steering valve body 1, the shuttle valve 6 is connected to the priority flow valve 3 to receive external flow and detect the flow rate, thereby generating a feedback signal for the flow detection. This feedback signal is then transmitted to the electro-proportional pressure reducing valve 2, allowing the electro-proportional pressure reducing valve 2 to adjust the flow distribution according to the feedback signal. The shuttle valve 6 controls the priority flow valve 3, ensuring that manual control and remote automatic control do not interfere with each other.

[0034] The implementation principle of an automatic steering control valve group in this application embodiment is as follows: During operation, the shuttle valve 6 detects the flow rate entering the hydraulic flow channel 11 and generates a feedback signal. After receiving the feedback signal, the electro-proportional pressure reducing valve 2 automatically adjusts the flow rate, thereby forming automatic control of the hydraulic system. Meanwhile, the hydraulic flow channel 11 on the steering valve body 1 remains unchanged, so that personnel can control it through the manual control system on the unmanned tractor. Thus, the unmanned tractor can be operated using both automatic and manual control modes.

[0035] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic steering control valve assembly, applied to the steering hydraulic control system of an unmanned tractor, characterized in that, include: The steering valve body (1) has a hydraulic flow channel (11) for hydraulic fluid to enter and transmit hydraulic energy; An electric proportional pressure reducing valve (2) is fixedly mounted on the steering valve body (1) and connected to the hydraulic flow channel (11). It is used to receive the control electrical signal of the unmanned tractor and to adjust the flow rate according to the control electrical signal. A priority flow valve (3) is fixedly mounted on the steering valve body (1). The priority flow valve (3) is connected to the hydraulic flow channel (11) and is used to receive the flow feedback signal from the unmanned tractor and adjust the pressure of the hydraulic flow channel (11).

2. The automatic steering control valve assembly according to claim 1, characterized in that: The steering valve body (1) is also provided with a balance valve (4), which is connected between the hydraulic flow channel (11) and the oil cylinder on the unmanned tractor to balance the load pressure of the oil cylinder.

3. The automatic steering control valve assembly according to claim 1, characterized in that: An overflow valve (5) is also fixedly provided on the main body (1) of the steering valve. The overflow valve (5) is connected to the hydraulic flow channel (11) and is used to adjust the pressure input to the hydraulic flow channel (11).

4. An automatic steering control valve assembly according to claim 1, characterized in that: The main body (1) of the steering valve is also provided with a shuttle valve (6), which is connected to the priority flow valve (3) and is used to control the pressure entering the priority flow valve (3).

5. An automatic steering control valve assembly according to claim 1, characterized in that: The hydraulic flow channel (11) is provided with a P port (111), a T port (112), an A port (113), a B port (114), an E port (115), and an F port (116). The P port (111) is connected to the steering oil source of the unmanned tractor, the T port (112) is connected to the hydraulic oil tank of the unmanned tractor, the A port (113) and the B port (114) are respectively connected to the steering cylinder of the unmanned tractor, and the E port (115) and the F port (116) are connected to the steering gear of the unmanned tractor.

6. An automatic steering control valve assembly according to claim 1, characterized in that: The maximum input flow rate range of the hydraulic flow channel (11) is 70-76 LPM.

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