A control device and method for oil regeneration during arm retraction, and an excavator

Abstract

This invention provides a control device, method, and excavator for oil return regeneration during stick retraction, relating to the field of excavators. The control device includes an electric control handle, a controller electrically connected to the handle, and a main valve electrically connected to the controller. The handle receives external signals, converts them into a first electrical signal, and outputs the first electrical signal. The controller receives the first electrical signal, converts it into a second electrical signal, and outputs the second electrical signal. The main valve's input is connected to the rod chamber, and its output is connected to the rodless chamber. The main valve receives the second electrical signal and adjusts its opening based on the voltage or current value represented by the second signal. This control device improves the accuracy of oil return regeneration control during stick retraction, optimizing excavator operation in terms of fuel consumption and operability.

Description

Technical Field

[0001] This invention relates to the field of excavators, and more specifically, to a control device, method, and excavator for oil return regeneration control during boom retraction. Background Technology

[0002] Hydraulic excavators are high-powered construction machines. During operation, the stick device moves frequently. Due to the large mass of the stick device, a large amount of potential energy is released during the stick retraction process. Most of this energy is consumed in the hydraulic valve throttling orifice and converted into heat energy, resulting in energy waste and system overheating, reducing the lifespan of hydraulic components, and exhibiting low energy utilization.

[0003] In existing excavators, the control precision of the stick is low during the return oil flow from the rod chamber to the rodless chamber when the stick retracts, which affects work efficiency. Summary of the Invention

[0004] The present invention includes, for example, providing a return oil regeneration control device during boom retraction, which can improve the control accuracy of return oil regeneration during boom retraction and optimize the excavator's fuel consumption and operability.

[0005] The present invention also aims to provide an excavator that includes the aforementioned boom retraction oil regeneration control device and has all the functions of the boom retraction oil regeneration control device.

[0006] The present invention also aims to provide a method for controlling the return oil regeneration during boom retraction, which can be used to improve the control accuracy of the boom.

[0007] The embodiments of the present invention can be implemented as follows:

[0008] An embodiment of the present invention provides a return oil regeneration control device for a stick retraction in an excavator. The excavator includes a hydraulic cylinder for driving the stick, the cylinder having a rod chamber and a rodless chamber. The return oil regeneration control device for stick retraction includes:

[0009] An electronically controlled handle, wherein the electronically controlled handle is used to receive external signals, convert the external signals into a first electrical signal, and output the first electrical signal;

[0010] A controller electrically connected to the electric control handle, the controller being used to receive the first electrical signal, convert the first electrical signal into a second electrical signal, and output the second electrical signal;

[0011] The main valve is electrically connected to the controller. The input end of the main valve is connected to the rod chamber, and the output end of the main valve is connected to the rodless chamber. The main valve is used to receive the second electrical signal and adjust the valve opening degree according to the voltage or current value represented by the second electrical signal.

[0012] Optionally, the main valve includes a first holding valve, the input end of which is connected to the rod chamber, and the output end of which is connected to the rodless chamber;

[0013] When the main valve receives the second electrical signal and the pressure in the rod chamber is greater than or equal to a preset value, the first holding valve is used to deliver hydraulic oil from the input end of the first holding valve to the output end of the first holding valve.

[0014] Optionally, the first holding valve includes a first directional valve and a first cone valve connected to the first directional valve, the first directional valve having a first state and a second state;

[0015] When the first directional valve is in the first state, the first cone valve is open, and the first holding valve is used to deliver hydraulic oil from the input end of the first holding valve to the output end. When the first directional valve is in the second state, the first cone valve is closed, and the first holding valve is used to keep the hydraulic oil in the first holding valve.

[0016] Optionally, the main valve further includes a first solenoid valve, the input end of which is connected to the output end of the first holding valve, and the output end of which is connected to the rodless chamber.

[0017] When the main valve receives the second electrical signal, the first solenoid valve is used to connect the input terminal and the output terminal of the first solenoid valve.

[0018] Optionally, the oil return and regeneration control device during boom retraction further includes a first main pump and an oil tank, wherein the input end of the first main pump is connected to the oil tank, and the output end of the first main pump is connected to the output end of the first solenoid valve.

[0019] The first main pump is used to mix the hydraulic oil in the oil tank with the hydraulic oil output from the first solenoid valve, and then they enter the rodless chamber together.

[0020] Optionally, the main valve further includes a second solenoid valve, the input end of which is connected to the first main pump, and the output end of which is connected to the output end of the first solenoid valve.

[0021] When the main valve receives the second electrical signal, the second solenoid valve is used to deliver hydraulic oil from the input end of the second solenoid valve to the output end of the second solenoid valve.

[0022] Optionally, the second solenoid valve is connected to the first holding valve via a pilot control oil circuit. When the main valve receives the second electrical signal, the second solenoid valve is used to cause the pilot oil to push the valve core of the first holding valve to change the working state of the first holding valve.

[0023] Optionally, the main valve further includes a third solenoid valve, the input end of which is connected to the output end of the first solenoid valve, and the output end of the third solenoid valve is an oil discharge port.

[0024] The controller is also used to output a third electrical signal. When the main valve receives the third electrical signal, the third solenoid valve is used to deliver hydraulic oil from the input end of the third solenoid valve to the output end of the third solenoid valve.

[0025] Embodiments of the present invention also provide an excavator, including the aforementioned oil return regeneration control device for boom retraction.

[0026] Embodiments of the present invention also provide a method for controlling oil return regeneration during stick retraction, for an excavator, the excavator including a main valve and a cylinder for driving the stick, the cylinder having a rod chamber and a rodless chamber, the input end of the main valve communicating with the rod chamber, and the output end of the main valve communicating with the rodless chamber, the method comprising:

[0027] Receive external signals, convert the external signals into a first electrical signal, and output the first electrical signal;

[0028] Receive the first electrical signal, convert the first electrical signal into a second electrical signal, and output the second electrical signal;

[0029] The valve opening of the main valve is adjusted according to the voltage or current value represented by the second electrical signal.

[0030] The beneficial effects of the boom retraction oil return regeneration control device, method, and excavator of this invention include, for example:

[0031] An embodiment of the present invention provides a return oil regeneration control device when the boom retracts. The controller outputs a second electrical signal. After receiving the second electrical signal, the main valve adjusts the valve opening according to the magnitude of the current or voltage value represented by the second electrical signal, thereby more accurately controlling the flow of hydraulic oil, improving the return oil regeneration control accuracy when the boom retracts, and optimizing the excavator's fuel consumption and operability.

[0032] Embodiments of the present invention also provide an excavator that includes the aforementioned boom retraction oil regeneration control device and has the beneficial effects of the boom retraction oil regeneration control device.

[0033] The embodiments of the present invention also provide a method for controlling the return oil regeneration during boom retraction. A second electrical signal is output, and the valve opening of the main valve is adjusted according to the magnitude of the current or voltage value represented by the second electrical signal. This method can also more accurately control the flow of hydraulic oil, improve the control accuracy of return oil regeneration during boom retraction, and optimize the excavator's fuel consumption and operability. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a control flowchart of the boom retraction oil regeneration control device provided in an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the internal oil circuit of the main valve provided in an embodiment of the present invention;

[0037] Figure 3 A flowchart of the oil return and regeneration control method during boom retraction provided in an embodiment of the present invention.

[0038] Icons: 100 - Oil return and regeneration control device during boom retraction; 10 - Electric control handle; 11 - Main valve; 111 - First holding valve; 1111 - First directional valve; 1112 - First cone valve; 112 - Second holding valve; 1121 - Second directional valve; 1122 - Second cone valve; 113 - First solenoid valve; 114 - Second solenoid valve; 1141 - First position; 1142 - Second position; 1143 - Third position; 1144 - Pilot control oil circuit; 115 - Third solenoid valve; 116 - Fourth solenoid valve; 12 - Controller; 13 - First main pump; 14 - Oil tank; 15 - Second main pump; 300 - Cylinder; 31 - Rod chamber; 32 - Rodless chamber. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0043] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0044] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0045] This embodiment provides an excavator including a hydraulic cylinder 300 for driving the stick. The hydraulic cylinder 300 has a rod chamber 31 and a rodless chamber 32. The excavator also includes a return oil regeneration control device 100 for stick retraction. The return oil regeneration control device 100 is used to form a hydraulic oil delivery circuit between the rod chamber 31 and the rodless chamber 32. Specifically, the return oil regeneration control device 100 can cause the hydraulic oil in the rod chamber 31 to flow back to the rodless chamber 32 when the stick is retracted, thereby accelerating the movement speed of the piston in the hydraulic cylinder 300 and effectively improving the stick retraction speed.

[0046] It should be noted that during the process of hydraulic oil flowing back from the rod chamber 31 to the rodless chamber 32, the flow rate of the hydraulic oil is unstable, resulting in low control accuracy when the stick retracts, and thus low working efficiency.

[0047] This embodiment also provides a boom retraction control device 100, which can effectively improve the control accuracy of the boom. For details, please refer to... Figure 1 and Figure 2 The boom retraction oil return and regeneration control device 100 includes an electric control handle 10, a controller 12 electrically connected to the electric control handle, and a main valve 11 electrically connected to the controller 12. The electric control handle 10 receives external signals, converts them into a first electrical signal, and outputs the first electrical signal. The controller 12 receives the first electrical signal, converts it into a second electrical signal, and outputs the second electrical signal. The input end of the main valve 11 is connected to the rod chamber 31, and the output end of the main valve 11 is connected to the rodless chamber 32. The main valve 11 receives the second electrical signal and adjusts the valve opening according to the voltage or current value represented by the second electrical signal.

[0048] It should be noted that the second electrical signal can be either a current signal or a voltage signal.

[0049] It should be noted that the aforementioned external signals can be operation signals from the operator to operate the electric control handle 10, or operation signals from the operator to press the buttons on the electric control handle 10.

[0050] It should be noted that in this embodiment, the electric control handle 10 is electrically connected to the controller 12. The operator can send a first electrical signal to the controller 12 by controlling the electric control handle 10, thereby controlling the controller 12 to output a second electrical signal. At the same time, the operator can control the magnitude of the current or voltage value represented by the second electrical signal by placing the electric control handle 10 in different positions.

[0051] It should be noted that in this embodiment, after the main valve 11 receives the second electrical signal, the pilot oil in the main valve 11 will push the valve core of the main valve 11 to move, thereby controlling the valve opening of the main valve 11. It is worth noting that the structure of driving the valve core by pilot oil is found in commonly used hydraulic systems, so the oil circuit of the pilot oil will not be described in detail here.

[0052] It should be noted that in this embodiment, the magnitude of the current or voltage value represented by the second electrical signal is positively correlated with the valve opening of the main valve 11. That is, the larger the current or voltage value represented by the second electrical signal, the larger the valve opening of the main valve 11, and the greater the flow rate of hydraulic oil from the rod chamber 31 through the main valve 11 to the rodless chamber 32. Similarly, the smaller the current or voltage value represented by the second electrical signal, the smaller the valve opening of the main valve 11, and the smaller the flow rate of hydraulic oil from the rod chamber 31 through the main valve 11 to the rodless chamber 32. Of course, in other embodiments, the magnitude of the current or voltage value represented by the second electrical signal may also be negatively correlated with the valve opening of the main valve 11.

[0053] It is worth noting that in this embodiment, the output and input ends of each valve body are based on the flow direction of the hydraulic oil when the boom retracts. Specifically, at this time, the hydraulic oil flows from the rod chamber 31 to the rodless chamber 32. That is to say, in other embodiments, for example, when the flow direction of the hydraulic oil is from the rodless chamber 32 to the rod chamber 31, the valve ports corresponding to the output and input ends of some valve bodies will change accordingly.

[0054] It is understandable that by changing the magnitude of the current or voltage value represented by the second electrical signal output by the controller 12, the valve opening of the main valve 11 can be accurately controlled, thereby improving the control accuracy of oil return regeneration when the boom retracts, and optimizing the excavator's fuel consumption and operability.

[0055] Specifically, in this embodiment, the main valve 11 includes a first holding valve 111. The input end of the first holding valve 111 is connected to the rod chamber 31, and the output end of the first holding valve 111 is connected to the rodless chamber 32. When the main valve 11 receives a second electrical signal and the pressure in the rod chamber 31 is greater than or equal to a preset value, the first holding valve 111 is used to deliver hydraulic oil from the input end of the first holding valve 111 to the output end of the first holding valve 111.

[0056] Understandably, the first holding valve 111 effectively maintains the hydraulic oil pressure in the rod chamber 31. When the hydraulic oil pressure in the rod chamber 31 is less than or equal to a preset value, the hydraulic oil remains within the first holding valve 111 and the rod chamber 31, at which point the stick remains in the preset position. When the hydraulic oil pressure in the rod chamber 31 is greater than or equal to the preset value, the hydraulic oil in the rod chamber 31 can pass through the first holding valve 111 and enter the rodless chamber 32, at which point the stick is in the retracted state. In actual use, the operator can adjust the specific value of the preset value according to the actual situation.

[0057] For details, please refer to Figure 2In this embodiment, the first holding valve 111 includes a first directional valve 1111 and a first cone valve 1112 connected to the first directional valve 1111. The first directional valve 1111 has a first state and a second state. When the first directional valve 1111 is in the first state, the first cone valve 1112 is open, and the first holding valve 111 is used to deliver hydraulic oil from the input end to the output end of the first holding valve 111. When the first directional valve 1111 is in the second state, the first cone valve 1112 is closed, and the first holding valve 111 is used to retain hydraulic oil within the first holding valve 111.

[0058] It should be noted that, please refer to Figure 2 When the first directional valve 1111 is in the first state, that is, when the valve core of the first directional valve 1111 is in the first state... Figure 2 When in the left position, the first holding valve 111 is used to deliver hydraulic oil from the input end of the first holding valve 111 to the output end of the first holding valve 111, and into the rodless chamber 32. When the first directional valve 1111 is in the second state, that is, when the valve core of the first directional valve 1111 is in the left position, the first directional valve 1111 is in the right position. Figure 2 When in the right position, the first holding valve 111 is in a pressure-holding state, and the hydraulic oil is held within the first holding valve 111 and the rod chamber 31. It is worth noting that in this embodiment, the first directional valve 1111 switches from the second state to the first state by pilot oil pushing the valve core of the first directional valve 1111.

[0059] Specifically, when the first directional valve 1111 is in the first state, Figure 2 Hydraulic oil in the spring-loaded chamber on the left side of the first cone valve 1112 enters the oil tank 14 through the first directional valve 1111. When the pressure of the hydraulic oil output from the rod chamber 31 is greater than or equal to a preset value, the hydraulic oil pushes the valve core of the first cone valve 1112 to the left, thus outputting from the output end of the first holding valve 111. It can be understood that when the first directional valve 1111 is in the second state... Figure 2 The spring-loaded chamber on the left side of the first cone valve 1112 is filled with hydraulic oil. The valve core of the first cone valve 1112 cannot move to the left, and the hydraulic oil output from the rod chamber 31 cannot pass through the first holding valve 111, thereby maintaining the hydraulic oil pressure in the rod chamber 31.

[0060] It should be noted that, please refer to Figure 2 In this embodiment, the main valve 11 also includes a second holding valve 112. The second holding valve 112 includes a second directional valve 1121 and a second cone valve 1122 connected to the second directional valve 1121. It should be noted that the second holding valve 112 can be used to maintain the hydraulic oil pressure in the rodless chamber 32. Its working principle is similar to that of the first holding valve 111, so it will not be described in detail here.

[0061] Please refer to Figure 2 In this embodiment, the main valve 11 further includes a first solenoid valve 113. The input end of the first solenoid valve 113 is connected to the output end of the first holding valve 111, and the output end of the first solenoid valve 113 is connected to the rodless chamber 32. When the main valve 11 receives a second electrical signal, the first solenoid valve 113 is used to connect the input end and the output end of the first solenoid valve 113.

[0062] It should be noted that in this embodiment, the first solenoid valve 113 is used to control the opening and closing of the oil passage from the rod chamber 31 to the rodless chamber 32. Specifically, when the main valve 11 receives the second electrical signal, the input end of the first solenoid valve 113 is connected to the output end of the first solenoid valve 113, and the hydraulic oil output from the output end of the first holding valve 111 can enter the rodless chamber 32 through the first solenoid valve 113. Of course, when the main valve 11 does not receive the second electrical signal, the input end of the first solenoid valve 113 is disconnected from the output end of the first solenoid valve 113, and the hydraulic oil cannot enter the rodless chamber 32.

[0063] Please refer to Figure 2 In this embodiment, the return oil regeneration control device 100 during boom retraction further includes a first main pump 13 and an oil tank 14. The input end of the first main pump 13 is connected to the oil tank 14, and the output end of the first main pump 13 is connected to the output end of the first solenoid valve 113. The first main pump 13 is used to mix the hydraulic oil in the oil tank 14 with the hydraulic oil output from the first solenoid valve 113, and then they enter the rodless chamber 32 together.

[0064] It is understandable that when the hydraulic oil output from the first solenoid valve 113 mixes with the hydraulic oil in the oil tank 14, it can increase the power of the hydraulic oil output from the first solenoid valve 113, effectively accelerate the speed at which the hydraulic oil enters the rodless chamber 32, thereby improving the response speed of the stick and increasing work efficiency.

[0065] Please refer to Figure 2 In this embodiment, the main valve 11 further includes a second solenoid valve 114. The input end of the second solenoid valve 114 is connected to the first main pump 13, and the output end of the second solenoid valve 114 is connected to the output end of the first solenoid valve 113. When the main valve 11 receives a second electrical signal, the second solenoid valve 114 is used to deliver hydraulic oil from the input end of the second solenoid valve 114 to the output end of the second solenoid valve 114.

[0066] It should be noted that in this embodiment, the second solenoid valve 114 is also a directional valve. When the main valve 11 receives the second electrical signal, the pilot oil pushes the valve core of the second solenoid valve 114 to move, so that the valve core of the second solenoid valve 114 is in a certain position. Figure 2 intermediate workstations ( Figure 2In the first working position 1141, the input and output ends of the second solenoid valve 114 are connected, allowing hydraulic oil output from the first main pump 13 to enter the rodless chamber 32 via the second solenoid valve 114. Of course, as the hydraulic oil returns from the rodless chamber 32 to the oil tank 14, the controller 12 can also send another electrical signal, causing the valve core of the second solenoid valve 114 to be in a specific position. Figure 2 The leftmost workstation ( Figure 2 Similarly, in the second station 1142, when the hydraulic pressure in the rod chamber 31 needs to return to the oil tank 14, the valve core of the second solenoid valve 114 can also be in the pilot position under the action of the pilot oil. Figure 2 The rightmost workstation ( Figure 2 (Third workstation, 1143).

[0067] Please refer to Figure 2 In this embodiment, the second solenoid valve 114 is connected to the first holding valve 111 through the pilot control oil circuit 1144. When the main valve 11 receives the second electrical signal, the second solenoid valve 114 is used to push the valve core of the first holding valve 111 with the pilot oil to change the working state of the first holding valve 111.

[0068] It should be noted that, in this embodiment, a pilot control oil circuit 1144 is provided between the second solenoid valve 114 and the first holding valve 111. Specifically, a pilot control oil circuit 1144 is provided between the second solenoid valve 114 and the first directional valve 1111 in the first holding valve 111. When the main valve 11 receives the second electrical signal, the pilot oil will simultaneously push the valve core of the second solenoid valve 114 and the valve core of the first directional valve 1111, so that the valve core of the second solenoid valve 114 is in the intermediate position. Figure 2 In the first station (1141), the valve core of the first directional valve 1111 is located at... Figure 2 The first directional valve 1111 is in the left position. That is to say, the pilot oil pushes the valve core of the first holding valve 111 to change the working state of the first holding valve 111. Specifically, the pilot oil pushes the valve core of the first directional valve 1111 to switch the first directional valve 1111 from the second state to the first state.

[0069] Please refer to Figure 2 In this embodiment, the main valve 11 further includes a third solenoid valve 115. The input end of the third solenoid valve 115 is connected to the output end of the first solenoid valve 113, and the output end of the third solenoid valve 115 is an oil discharge port. The controller 12 is also used to output a third electrical signal. When the main valve 11 receives the third electrical signal, the third solenoid valve 115 is used to transport hydraulic oil from the input end of the third solenoid valve 115 to the output end of the third solenoid valve 115.

[0070] It should be noted that while the controller 12 is continuously outputting the second electrical signal, it can also output a third electrical signal through another transmitter. When the main valve 11 receives the third electrical signal, the hydraulic oil is transported from the input end of the third solenoid valve 115 to the output end of the third solenoid valve 115, and finally enters the oil tank 14 to complete the oil unloading, thereby cutting off the return oil operation from the rod chamber 31 to the rodless chamber 32.

[0071] Please refer to Figure 2 In this embodiment, the return oil regeneration control device 100 during boom retraction further includes a second main pump 15 and a fourth solenoid valve 116. The input end of the second main pump 15 is connected to the oil tank 14, and the output end of the second main pump 15 is connected to the input end of the fourth solenoid valve 116. The output end of the fourth solenoid valve 116 is connected to the output end of the second solenoid valve 114. When the main valve 11 receives a second electrical signal, the fourth solenoid valve 116 is used to deliver hydraulic oil from the input end of the fourth solenoid valve 116 to the output end of the fourth solenoid valve 116.

[0072] It should be noted that, please refer to Figure 2 In this embodiment, the fourth solenoid valve 116 is also a directional valve. When the main valve 11 receives the second electrical signal, the pilot oil pushes the valve core of the fourth solenoid valve 116 to move. At this time, the valve core of the fourth solenoid valve 116 is located at... Figure 2 The right position in the middle. The working principle of the fourth solenoid valve 116 is similar to that of the second solenoid valve 114, so it will not be described again here.

[0073] It is understood that in this embodiment, the hydraulic oil output from the output end of the second solenoid valve 114, the hydraulic oil output from the fourth solenoid valve 116, and the hydraulic oil output from the first solenoid valve 113 are mixed and enter the rodless chamber 32 together, which further increases the speed at which the hydraulic oil enters the rodless chamber 32, thereby improving the response speed of the stick and improving working efficiency.

[0074] Please refer to Figure 3 and combined Figure 1 and Figure 2 The present invention also provides a method for controlling the return oil regeneration during stick retraction in an excavator. The excavator includes a main valve 11 and a cylinder 300 for driving the stick. The cylinder 300 has a rod chamber 31 and a rodless chamber 32. The input end of the main valve 11 is connected to the rod chamber 31, and the output end of the main valve 11 is connected to the rodless chamber 32. The method for controlling the return oil regeneration during stick retraction includes:

[0075] S100: Receives external signals, converts the external signals into a first electrical signal, and outputs the first electrical signal.

[0076] S200: Receives the first electrical signal, converts the first electrical signal into a second electrical signal, and outputs the second electrical signal.

[0077] S300: Adjust the valve opening of the main valve 11 according to the voltage or current value represented by the second electrical signal.

[0078] Understandably, the electric control handle 10 receives an external signal, converts it into a first electrical signal, and outputs the first electrical signal. The controller 12 receives the first electrical signal, converts it into a second electrical signal, and outputs the second electrical signal. After the main valve 11 receives the second electrical signal, the pilot oil in the main valve 11 pushes the valve core of the main valve 11 to move, thereby adjusting the valve opening of the main valve 11. By changing the current or voltage value represented by the second electrical signal output by the controller 12, the valve opening of the main valve 11 can be accurately controlled, thereby improving the accuracy of oil return regeneration control during boom retraction and optimizing the excavator's fuel consumption and operability.

[0079] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A return oil regeneration control device for boom retraction, used in an excavator, the excavator including a hydraulic cylinder for driving the boom, the hydraulic cylinder having a rod chamber and a rodless chamber, characterized in that, The oil return and regeneration control device during boom retraction includes: An electronically controlled handle, wherein the electronically controlled handle is used to receive external signals, convert the external signals into a first electrical signal, and output the first electrical signal; A controller electrically connected to the electric control handle, the controller being used to receive the first electrical signal, convert the first electrical signal into a second electrical signal, and output the second electrical signal; A first main pump and an oil tank, wherein the input end of the first main pump is connected to the oil tank; A main valve electrically connected to the controller has its input end connected to the rod chamber and its output end connected to the rodless chamber. The main valve receives the second electrical signal and adjusts its valve opening based on the voltage or current value represented by the second electrical signal. The main valve includes a first holding valve, a first solenoid valve, and a second solenoid valve. The input end of the first holding valve is connected to the rod chamber, and its output end is connected to the rodless chamber. When the main valve receives the second electrical signal and the pressure in the rod chamber is greater than or equal to a preset value, the hydraulic oil flowing out of the rod chamber mixes with the hydraulic oil in the tank and enters the rodless chamber. The input end of the first solenoid valve is connected to... The output end of the first holding valve is connected, and the output end of the first solenoid valve is connected to the rodless chamber and the output end of the first main pump. The first main pump is used to mix the hydraulic oil in the oil tank with the hydraulic oil output from the first solenoid valve and then enter the rodless chamber together. When the main valve receives the second electrical signal, the first solenoid valve is used to connect the input end of the first solenoid valve with the output end of the first solenoid valve. The input end of the second solenoid valve is connected to the first main pump, and the output end of the second solenoid valve is connected to the output end of the first solenoid valve. When the main valve receives the second electrical signal, the second solenoid valve is used to deliver hydraulic oil from the input end of the second solenoid valve to the output end of the second solenoid valve.

2. The boom retraction oil regeneration control device according to claim 1, characterized in that, The first holding valve includes a first directional valve and a first cone valve connected to the first directional valve, the first directional valve having a first state and a second state; When the first directional valve is in the first state, the first cone valve is open, and the first holding valve is used to deliver hydraulic oil from the input end of the first holding valve to the output end. When the first directional valve is in the second state, the first cone valve is closed, and the first holding valve is used to keep the hydraulic oil in the first holding valve.

3. The oil return and regeneration control device during boom retraction according to claim 1, characterized in that, The second solenoid valve is connected to the first holding valve through a pilot control oil circuit. When the main valve receives the second electrical signal, the second solenoid valve is used to cause the pilot oil to push the valve core of the first holding valve to change the working state of the first holding valve.

4. The boom retraction oil regeneration control device according to any one of claims 1-3, characterized in that, The main valve also includes a third solenoid valve, the input end of which is connected to the output end of the first solenoid valve, and the output end of the third solenoid valve is an oil discharge port. The controller is also used to output a third electrical signal. When the main valve receives the third electrical signal, the third solenoid valve is used to deliver hydraulic oil from the input end of the third solenoid valve to the output end of the third solenoid valve.

5. An excavator, characterized in that, Includes the oil return and regeneration control device for boom retraction as described in any one of claims 1-4.

6. A method for controlling oil return regeneration during boom retraction, used in the excavator as described in claim 5, characterized in that, The method includes: Receive external signals, convert the external signals into a first electrical signal, and output the first electrical signal; Receive the first electrical signal, convert the first electrical signal into a second electrical signal, and output the second electrical signal; The valve opening of the main valve is adjusted according to the voltage or current value represented by the second electrical signal.

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