Hydraulic oil circuit sharing system of backhoe loader and backhoe loader

Abstract

The present invention discloses a hydraulic oil circuit sharing system for an excavator loader and an excavator loader. The hydraulic oil circuit sharing system for the excavator loader includes: a control module, a handle switching module, an end tool switching module, a main valve module, and a switching switch; the control module is used to convert a handle operation signal into an oil quantity control signal; the main valve module is connected to the end tool switching module oil circuit; the main valve module is provided with a first oil circuit and a second oil circuit, and the main valve module is used to control the flow of working oil input into the end tool switching module; the end tool switching module includes a loading end auxiliary tool, an excavating end auxiliary tool, and a switching valve block, and the two auxiliary tools share the first oil circuit and the second oil circuit; the switching switch is connected between the handle switching module and a power supply; the control module is used to receive handle operation signals of different operating handles in the handle switching module according to the connection and disconnection between the control module and the power supply. The present invention reduces the space occupied by the internal oil circuit of the loader excavator and is low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of backhoe loader equipment, and in particular to a hydraulic oil circuit common system of a backhoe loader and the backhoe loader. Background Art

[0002] With the rapid development of society, the operating efficiency of various mechanical equipment is becoming increasingly important, and equipment with a high degree of integration has also been fully developed. Backhoe loaders are equipped with a loading device at the front and an excavating device at the back, which is equivalent to integrating the functions of a loader and an excavator. Due to these characteristics, they are popular among many users.

[0003] In addition to their standard basic functions, loader excavators often require new features during operation. These include hydraulic shears, a breaker hammer, and a rotary wood clamp at the excavation end, and bucket opening and closing at the loading end. To achieve these features, a new main valve and, consequently, a new oil circuit are required, supplying oil to both the excavation and loading ends through two separate circuits. This setup, due to the addition of new components, occupies a significant portion of the loader excavator's internal space and is costly. Summary of the Invention

[0004] The invention provides a hydraulic oil circuit common system of an excavator loader and an excavator loader, so as to solve the problem that the internal oil circuit of the loader excavator occupies a large space and has a high cost.

[0005] According to one aspect of the present invention, a hydraulic oil circuit sharing system for a backhoe loader is provided, the hydraulic oil circuit sharing system for the backhoe loader comprising: a control module, a handle switching module, an end tool switching module, a main valve module and a switching switch;

[0006] The input end of the control module is electrically connected to the output end of the handle switching module, and the handle switching module includes at least two operating handles; the operating handles are provided with a dial, and a handle operation signal is generated by dialing the dial; the output end of the control module is electrically connected to the main valve module; the control module is used to convert the handle operation signal into an oil quantity control signal;

[0007] The main valve module is connected to the oil circuit of the end tool switching module; the main valve module is provided with a first oil circuit and a second oil circuit, and the main valve module is used to input the working oil into the end tool switching module through the first oil circuit, and output it to the main valve module through the second oil circuit, and control the flow rate of the working oil input into the end tool switching module;

[0008] The end tool switching module includes a loading end tool, an excavating end tool, and a switching valve block. The two tools share the first oil circuit and the second oil circuit. The module is used to input the working oil input by the main valve module into the switching valve block. The switching valve block is used to input the working oil into the loading end tool or the excavating end tool.

[0009] The handle switching module is provided with a third oil circuit and a fourth oil circuit, the third oil circuit is used to input pilot oil to the operating handle and return oil through the fourth oil circuit;

[0010] The switching switch is connected between the handle switching module and the power supply; the switching switch is also connected between the end tool switching module and the power supply; and the switching switch is also connected between the control module and the power supply; the switching switch is used to control the switching of the loading end auxiliary tool and the excavation end auxiliary tool in the end tool switching module, and the control module is used to receive the handle operation signals of different operating handles in the handle switching module according to the connection and disconnection between it and the power supply.

[0011] Optionally, the main valve module includes: a first proportional solenoid valve, a second proportional solenoid valve and a main control valve;

[0012] The input ends of the first proportional solenoid valve and the second proportional solenoid valve are electrically connected to the output end of the control module; the first input end of the main control valve is connected to the output end oil circuit of the first proportional solenoid valve, the second input end of the main control valve is connected to the output end oil circuit of the second proportional solenoid valve, the first output end of the main control valve is connected to the end tool switching module through the first oil circuit, and the second output end of the main control valve is connected to the end tool switching module through the second oil circuit;

[0013] The first proportional solenoid valve and the second proportional solenoid valve are used to control the flow distribution of the working oil in the main control valve according to the oil quantity control signal.

[0014] Optionally, the main control valve is a hydraulically controlled main valve.

[0015] Optionally, the main valve module further includes: a relief valve, an oil replenishment one-way valve, a fifth oil circuit and a sixth oil circuit;

[0016] The main control valve inputs the working oil into the end tool switching module through the fifth oil passage, and outputs the refluxed working oil to the recovery tank through the sixth oil passage;

[0017] The relief valve includes a first relief valve and a second relief valve; the oil replenishment check valve includes a first oil replenishment check valve and a second oil replenishment check valve; the first relief valve and the first oil replenishment check valve are connected between the first oil circuit and the sixth oil circuit, and the second relief valve and the second oil replenishment check valve are connected between the second oil circuit and the sixth oil circuit.

[0018] Optionally, the handle switching module includes a safety solenoid valve;

[0019] The switching signal input end of the safety solenoid valve is electrically connected to the switching switch, the safety solenoid valve is connected to the pilot oil supply equipment through the third oil circuit, and the safety solenoid valve is connected to the recovery oil tank through the fourth oil circuit. The safety solenoid valve is used to control the pilot oil input into the operating handle of the excavation end according to the opening and closing signal of the switching switch.

[0020] Optionally, the operating handle includes an excavation end handle and a loading end handle;

[0021] The safety solenoid valve is connected to the excavation end handle via a seventh oil circuit, the excavation end handle is connected to the recovery oil tank via an eighth oil circuit, and the signal output end of the excavation end handle is electrically connected to the control module;

[0022] The loading end handle is connected to the pilot oil supply device through the third oil circuit, the loading end handle is connected to the recovery oil tank through the ninth oil circuit, and the signal output end of the loading end handle is electrically connected to the control module.

[0023] Optionally, the switching valve block includes: an oil circuit switching solenoid valve;

[0024] The oil circuit switching solenoid valve is connected to the first output end of the main valve module through the first oil circuit, and the oil circuit switching solenoid valve is connected to the second output end of the main valve module through the second oil circuit; the oil circuit switching solenoid valve is connected to the first input end of the loading end auxiliary tool through the ninth oil circuit, and the oil circuit switching solenoid valve is connected to the second input end of the loading end auxiliary tool through the tenth oil circuit; the oil circuit switching solenoid valve is connected to the first input end of the excavation end auxiliary tool through the eleventh oil circuit, and the oil circuit switching solenoid valve is connected to the second input end of the excavation end auxiliary tool through the twelfth oil circuit; the oil circuit switching solenoid valve is used to supply oil to the loading end auxiliary tool or the excavation end auxiliary tool.

[0025] Optionally, the oil circuit switching solenoid valve includes: a two-position six-way solenoid valve.

[0026] Optionally, the main valve module includes: an electrically controlled main valve;

[0027] The input end of the electrically controlled main valve is electrically connected to the output end of the control module, the first output end of the electrically controlled main valve is connected to the end tool switching module through the first oil circuit, and the second output end of the electrically controlled main valve is connected to the end tool switching module through the second oil circuit; the electrically controlled main valve is used to input the working oil into the end tool switching module through the first oil circuit, and output it to the electrically controlled main valve through the second oil circuit, and control the flow rate of the working oil input into the end tool switching module.

[0028] According to another aspect of the present invention, a backhoe loader is provided, characterized in that the backhoe loader includes the hydraulic oil circuit common system of the backhoe loader described in any of the above embodiments.

[0029] The technical solution provided by the embodiment of the present invention, by setting a control module, a handle switching module, an end tool switching module, a main valve module and a switching switch, can be read by the control module. The electrical signal of the switching switch can be read by the control module. When the switching switch is closed, the control module only recognizes the handle operation signal sent by the toggle dial of the excavation end operating handle. When the switching switch is disconnected, the control module only recognizes the handle operation signal sent by the toggle dial of the loading end operating handle, thereby preventing misoperation of the dial when the dial is used. The control module can convert the handle operation signal sent by the operating handle by toggling the dial into an oil volume control signal, so that the main valve module can adjust the oil flow, thereby controlling the flow of the working oil input into the loading end auxiliary tool or the excavation end auxiliary tool. By setting different maximum currents for the loading end and the excavation end output by the control module, the main valve module can be controlled to provide different flow rates of working oil to the excavation end and the loading end, respectively, to meet the maximum flow requirements of different auxiliary tools. The loading end and the excavating end provided in the embodiment of the present invention share a main valve module. The working oil of the end tool switching module can be input through the first oil circuit and the second oil circuit. There is no need to set up separate oil circuits for the loading end auxiliary tools and the excavating end auxiliary tools. Through this setting method, the internal occupied space of the loading excavator is reduced, and the layout of the internal oil pipeline is simplified, reducing the design difficulty and cost.

[0030] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 12 is a structural diagram of a hydraulic oil circuit sharing system for a backhoe loader provided in an embodiment of the present invention;

[0033] Figure 2 2 is a schematic structural diagram of another hydraulic oil circuit sharing system for a backhoe loader provided in accordance with an embodiment of the present invention;

[0034] Figure 3 2 is a structural diagram of a hydraulic oil circuit sharing system for a backhoe loader according to another embodiment of the present invention;

[0035] Figure 4 2 is a structural diagram of a hydraulic oil circuit sharing system for a backhoe loader according to another embodiment of the present invention;

[0036] Figure 5 3 is a structural diagram of a hydraulic oil circuit sharing system for another backhoe loader provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0038] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] The embodiment of the present invention provides a hydraulic oil circuit sharing system for an excavator loader. Figure 1 A structural diagram of a hydraulic oil circuit sharing system for an excavator loader provided by an embodiment of the present invention, with reference to Figure 1The hydraulic oil circuit shared system of the backhoe loader includes: a control module 1, a handle switching module 2, an end tool switching module 3, a main valve module 4, and a switch 5. The input end of the control module 1 is electrically connected to the output end of the handle switching module 2. The handle switching module 2 includes at least two operating handles. The operating handles are provided with a dial. For example, the dial on the operating handle can be a Hall dial. By turning the Hall dial, a handle operation signal can be sent to the control module 1. The handle operation signal can be a voltage signal. The output end of the control module 1 is electrically connected to the main valve module 4. The control module 1 is used to convert the handle operation signal into an oil volume control signal. The main valve module 4 is connected to the end tool switching module 3 oil circuit. The main valve module 4 is provided with a first oil circuit Y1 and a second oil circuit Y2. The main valve module 4 is used to input the working oil into the end tool switching module through the first oil circuit Y1 and output it to the main valve module 4 through the second oil circuit Y2, thereby controlling the flow rate of the working oil in the input end tool switching module 3. The tool switching module 3 includes a loading tool 31, an excavating tool 32, and a switching valve block 34. Both tools share a first oil circuit Y1 and a second oil circuit Y2. The switching valve block 34 is used to transfer the operating oil from the main valve module 4 to the operating oil circuit. The switching valve block 34 then transfers the operating oil to either the loading tool 31 or the excavating tool 32. The handle switching module 2 is provided with a third oil circuit Y3 and a fourth oil circuit Y4. The third oil circuit Y3 is used to input pilot oil to the operating handle and return oil through the fourth oil circuit Y4. A switching switch 5 is connected between the handle switching module 2 and the power supply. The switching switch 5 is also connected between the tool switching module 3 and the power supply. Furthermore, the switching switch 5 is connected between the control module 1 and the power supply. The switching switch 5 controls the switching between the loading tool 31 and the excavating tool 32 in the tool switching module 3. The control module 1 receives operating signals from the different operating handles in the handle switching module 2 based on its connection to the power supply.

[0040] The backhoe loader is provided with a loading end and an excavation end. The lever of the operating handle is the hydraulic part of the operating handle. By swinging the lever of the loading end operating handle left and right and up and down, the basic functions of raising and lowering the boom of the loading end and retracting and extending the bucket can be realized. The dial of the operating handle is the electrical control part of the operating handle. The dial wheel can be set on the lever. By installing the loading end auxiliary tool 31 on the loading end and moving the dial wheel of the loading end operating handle left and right, more functions such as opening and closing the bucket can be realized. By swinging the lever of the excavation end operating handle left and right and up and down, the basic functions of rotating the excavation end, raising and lowering the boom, retracting and releasing the bucket arm, retracting and releasing the bucket, and extending and retracting the outriggers can be realized. By installing the excavation end auxiliary tool 32 on the excavation end and moving the dial wheel of the excavation end operating handle left and right, more functions such as extending and retracting the bucket arm, hydraulic shears, breaker hammer, rotating wood clamps can be realized.

[0041] For example, when the switching switch 5 is closed, the end tool switching module 3 is connected to the power supply, and the switching valve block 34 connects the oil circuit of the end tool switching module 3 with the excavation end auxiliary tool 32, so that the excavation end auxiliary tool 32 can work. The third oil circuit Y3 is used to input pilot oil to the operating handle that controls the excavation end. At this time, the hydraulic part of the operating handle of the excavation end can work to control the excavation operation. At the same time, the control module 1 receives the electrical signal input from the switching switch 5 to the control module 1. At this time, the control module 1 only recognizes the handle operation signal sent by the dial wheel of the excavation end operating handle, and does not recognize the handle operation signal sent by the dial wheel of the loading end operating handle. When the dial wheel on the operating handle of the excavation end is turned, the operating handle sends the handle operation signal of the excavation end to the control module 1. The control module 1 converts this handle operation signal into an oil quantity control signal and inputs it into the main valve module 4. The main valve module 4 adjusts the oil circuit flow according to the oil quantity control signal. The oil quantity control signal can be a current signal of different sizes. At this time, the oil circuit of the end tool switching module 3 is connected to the excavation end auxiliary tool 32 , and the main valve module 4 can directly input the regulated oil into the excavation end auxiliary tool 32 through the end tool switching module 3 , so that the excavation end auxiliary tool 32 is put into operation.

[0042] When the switch 5 is off, the end tool switching module 3 is disconnected from the power supply, and the switching valve block 34 connects the oil circuit of the end tool switching module 3 to the loading-end auxiliary tool 31, allowing the loading-end auxiliary tool 31 to operate. The third oil circuit Y3 inputs pilot oil to the operating handle used to control the loading end. At this time, there is no pilot oil in the operating handle of the excavation end, and the control module 1 does not receive the electrical signal from the switch 5. The control module 1 only recognizes the handle operation signal sent by the toggle wheel of the loading-end operating handle. When the toggle wheel of the loading-end operating handle is turned, the operating handle sends the loading-end handle operation signal to the control module 1. The control module 1 converts this handle operation signal into an oil quantity control signal and inputs it into the main valve module 4. The main valve module 4 adjusts the oil circuit flow according to the oil quantity control signal. At this time, the oil circuit of the end tool switching module 3 is connected to the loading-end auxiliary tool 31. The main valve module 4 can directly input the regulated oil into the loading-end auxiliary tool 31 through the end tool switching module 3, putting the loading-end auxiliary tool 31 into operation. For example, the main valve module 4 can input the working oil into the switching module 3 through the first oil circuit Y1 and return the oil through the second oil circuit Y2, or it can input the working oil into the switching module 3 through the second oil circuit Y2 and return the oil through the first oil circuit Y1.

[0043] Therefore, the loading end attachment 31 and the excavating end attachment 32 can share the first oil passage Y1 and the second oil passage Y2 .

[0044] The technical solution provided by the embodiment of the present invention is to set up a control module 1, a handle switching module 2, an end tool switching module 3, a main valve module 4 and a switching switch 5. The control module 1 can read the electrical signal of the switching switch 5. When the switching switch 5 is closed, the control module 1 only recognizes the handle operation signal sent by the toggle wheel of the excavation end operating handle. When the switching switch 5 is disconnected, the control module 1 only recognizes the handle operation signal sent by the toggle wheel of the loading end operating handle, thereby preventing misoperation of the toggle wheel. The control module 1 can convert the handle operation signal sent by the operating handle by toggling the toggle wheel into an oil volume control signal, so that the main valve module 4 adjusts the oil flow, thereby controlling the flow of the working oil input into the loading end auxiliary tool 31 or the excavation end auxiliary tool 32. By setting different maximum current signals for the loading end and the excavation end output by the control module 1, the main valve module 4 can be controlled to provide different flow rates of working oil to the excavation end and the loading end, respectively, to meet the maximum flow requirements of different auxiliary tools. The loading end and the excavating end provided in the embodiment of the present invention share a main valve module 4. The working oil of the end tool switching module 3 can be input through the first oil circuit Y1 and the second oil circuit Y2. There is no need to set separate oil circuits for the loading end auxiliary tool 31 and the excavating end auxiliary tool 32. Through this setting method, the internal occupied space of the loading excavator is reduced, the layout of the internal oil pipeline is simplified, and the design difficulty and cost are reduced.

[0045] Figure 2 A structural diagram of another hydraulic oil circuit sharing system for a backhoe loader provided by an embodiment of the present invention, referring to Figure 2 Based on the above embodiments, the main valve module 4 optionally includes: a first proportional solenoid valve 41, a second proportional solenoid valve 42, and a main control valve 43. The input ends of the first and second proportional solenoid valves 41, 42 are electrically connected to the output end of the control module 1. The first input end A1 of the main control valve 43 is connected to the oil circuit of the output end of the first proportional solenoid valve 41, and the second input end A2 of the main control valve 43 is connected to the oil circuit of the output end of the second proportional solenoid valve 42. The first output end of the main control valve 43 is connected to the end tool switching module 3 via the first oil circuit Y1, and the second output end of the main control valve 43 is connected to the end tool switching module 3 via the second oil circuit Y2. The first and second proportional solenoid valves 41, 42 are used to control the flow distribution of the working oil in the main control valve 43 according to the oil quantity control signal.

[0046] The control module 1 converts the handle operation signal input from the handle switching module 2 into an oil volume control signal. To distinguish the direction of the dial on the operating handle, thereby enabling each end tool to operate in different directions, a first proportional solenoid valve 41 and a second proportional solenoid valve 42 are provided, each independently controlled in response to the dial's direction of movement. The first and second proportional solenoid valves 41 and 42 are supplied with oil via the third oil circuit Y3 and are connected to the oil recovery tank via their oil circuit output terminals T3. For example, when the handle dial is turned left (right), the control module 1 receives the handle operation signal and converts it into an oil volume control signal, which is then input into the first proportional solenoid valve 41, causing it to operate. Pilot oil is supplied to the first proportional solenoid valve 41 via the third oil circuit Y3. The first proportional solenoid valve 41 then delivers the pilot oil to the first input terminal A1 of the main control valve 43, pushing the valve core of the main control valve 43 rightward. The main control valve 43 then supplies oil to the end tool switching module 3 via the first oil circuit Y1. The first proportional solenoid valve 41 moves the valve core a different distance depending on the oil control signal. This adjusts the flow of the hydraulic oil in the input end tool switching module 3. The hydraulic oil enters the end tool switching module 3 through the second oil passage Y2 of the main control valve 43, connecting the excavating tool 32 or the loading tool 31 to the oil passage, enabling normal operation. The oil is then returned via the first oil passage Y1.

[0047] When the dial on the operating handle is turned right (left), control module 1 receives the handle operation signal and converts it into an oil quantity control signal, which is input into second proportional solenoid valve 42, causing second proportional solenoid valve 42 to operate. Second proportional solenoid valve 42 inputs pilot oil into second input port A2 of main control valve 43, pushing the valve core of main control valve 43 to the left. Main control valve 43 supplies oil to end tool switching module 3 through first oil circuit Y1, and returns oil through second oil circuit Y2.

[0048] In the embodiment of the present invention, by providing a first proportional solenoid valve 41 and a second proportional solenoid valve 42, it is possible to distinguish the direction of the dial of the operating handle, thereby improving the reliability of the operation of the backhoe loader. Only one main control valve 43 is required. By sharing the first oil circuit Y1 and the second oil circuit Y2, the input of working oil into the excavation end auxiliary tool 32 and the loading end auxiliary tool 31 can be achieved, without the need for a complex oil circuit design, thereby reducing the internal occupied volume of the backhoe loader.

[0049] Based on the above embodiments, optionally, the main control valve 43 is a hydraulic control main valve.

[0050] Among them, the hydraulic control main valve switches the oil circuit and adjusts the flow rate through the input pilot oil. During the working process, it is only controlled by the input pilot oil, with good stability and no electrical connection between it and other equipment. Therefore, its normal operation will not be affected by external contact with water, thereby improving its wading ability.

[0051] Continue to refer Figure 2 Based on the above embodiments, the main valve module 4 optionally further includes: a relief valve 45, an oil replenishment check valve 46, a fifth oil circuit Y5, and a sixth oil circuit Y6. The main control valve inputs the working oil into the switching module 3 via the fifth oil circuit Y5, and outputs the returned working oil to the recovery tank via the sixth oil circuit Y6. The relief valve 45 includes a first relief valve 451 and a second relief valve 452; the oil replenishment check valve 46 includes a first oil replenishment check valve 461 and a second oil replenishment check valve 462. The first relief valve 451 and the first oil replenishment check valve 461 are connected between the first oil circuit Y1 and the sixth oil circuit Y6, and the second relief valve 452 and the second oil replenishment check valve 462 are connected between the second oil circuit Y2 and the sixth oil circuit Y6.

[0052] When the tool switching module 3 and the main control valve 43 circulate the working oil, excessive oil in the pipeline may cause a certain impact on the pipeline. Therefore, the provision of a relief valve 45 can reduce the impact on the oil pipeline and play a role in protecting the oil pipeline. If the oil in the pipeline is insufficient, it may affect the normal operation of the excavation end auxiliary tool 32 or the loading end auxiliary tool 31. Therefore, the oil replenishment check valve 46 can be used to replenish the oil to ensure that the operation of the excavation end auxiliary tool 32 or the loading end auxiliary tool 31 is always stable. Because the working oil flowing back to the main control valve 43 from the tool switching module 3 has a relatively high temperature, a heat dissipation system can be provided between the sixth oil circuit Y6 and the recovery tank to cool the working oil before outputting it to the recovery tank, thereby improving the stability of the working oil in the recovery tank.

[0053] Figure 3 A structural diagram of a hydraulic oil circuit sharing system for a backhoe loader according to an embodiment of the present invention is provided. Figure 3 Based on the above embodiments, the handle switching module 2 optionally includes a safety solenoid valve 21. The switching signal input terminal of the safety solenoid valve 21 is electrically connected to the switch 5. The safety solenoid valve 21 is connected to the pilot oil supply device via the third oil line Y3. The safety solenoid valve 21 is connected to the recovery oil tank via the fourth oil line Y4. The safety solenoid valve 21 is used to control the pilot oil input to the operating handle of the excavator end according to the on / off signal of the switch 5.

[0054] For example, when the switch 5 is closed, the safety solenoid valve 21 is energized. At this point, the safety solenoid valve 21 receives pilot oil from the third oil circuit Y3 and inputs it into the operating handle for controlling the excavating end. When the operating handle for the excavating end is turned, the control module 1 receives a handle operation signal from the operating handle. This signal is converted into an oil flow control signal and input into the main control valve 43. The main control valve 43 adjusts the oil flow in the circuit based on the oil flow control signal. This connects the oil circuit of the tool switching module 3 to the excavating end auxiliary tool 32, enabling the excavating end auxiliary tool 32 to operate normally. When the switch 5 is opened, the safety solenoid valve 21 loses power. At this point, the safety solenoid valve 21 cannot receive pilot oil from the third oil circuit Y3, rendering the operating handle for controlling the excavating end inoperable. However, the hydraulic portion of the operating handle for controlling the loading end continues to operate, receiving pilot oil from the third oil circuit Y3. Simultaneously, the control module 1 receives no electrical signals from the switch 5 and only recognizes the handle operation signal from the loading end's dial. At this time, the oil circuit of the end tool switching module 3 is connected to the loading end auxiliary tool 31, which can make the loading end auxiliary tool 31 work normally.

[0055] Continue to refer Figure 3 Based on the above embodiments, the operating handles optionally include an excavation handle 22 and a loading handle 23. The safety solenoid valve is connected to the excavation handle 22 via the seventh oil line Y7, the excavation handle 22 is connected to the recovery oil tank via the eighth oil line Y8, and the signal output end of the excavation handle 22 is electrically connected to the control module 1. The loading handle 23 is connected to the pilot oil supply device via the third oil line Y3, and is connected to the recovery oil tank via the ninth oil line Y9. The signal output end of the loading handle 23 is electrically connected to the control module 1.

[0056] When the switch 5 is closed, the safety solenoid valve 21 is energized. At this point, the safety solenoid valve 21 receives pilot oil from the third oil circuit Y3 and inputs it into the excavator handle 22 via the seventh oil circuit Y7, enabling the excavator handle 22 to operate. Simultaneously, the control module 1 receives the electrical signal from the switch 5 and only recognizes the handle operation signal from the toggle of the excavator handle 22. For example, the excavator handle 22 may be a cross-shaped handle with a toggle. When the toggle of the excavator handle 22 is turned left or right, the control module 1 receives the handle operation signal from the toggle of the excavator handle 22 left or right. Based on the toggle amplitude, the control module 1 generates different oil flow control signals, thereby controlling the flow of operating oil input into the excavator auxiliary tool 32 by the main control valve 43. This allows the excavator auxiliary tool 32 to perform different amplitude movements. The excavator handle 22 only operates when the switch 5 is closed, thus providing high reliability and safety. Because the loading handle 23 also receives pilot oil from the third oil circuit Y3, it can still operate. However, the control module 1 does not recognize the handle operation signal from the dial of the loading handle 23, and no hydraulic oil is input to the loading auxiliary tool 31. Therefore, the hydraulic part of the loading handle 23 can operate, but it cannot operate the loading auxiliary tool 31.

[0057] When the switch 5 is off, the safety solenoid valve 21 loses power, and the pilot oil in the third oil circuit Y3 cannot supply oil to the excavator handle 22. Simultaneously, the control module 1 cannot receive the electrical signal from the switch 5 and can only recognize the handle operation signal from the dial on the loading handle 23. Therefore, the excavator cannot operate. Specifically, because the excavator handle 22 lacks pilot oil input, moving the lever of the excavator handle 22 does not produce a corresponding movement. Furthermore, when the dial on the excavator handle 22 is moved, the control module 1 does not receive the handle operation signal generated by the dial, and the excavator auxiliary tool 32 does not operate. This configuration prevents malfunctions caused by erroneous movement of the excavator handle 22. When the dial on the loading handle 23 is turned left or right, the control module 1 receives a handle operation signal indicating the left or right rotation of the loading handle 23. Based on the amplitude of the rotation, the control module 1 generates different oil flow control signals, thereby controlling the flow of operating oil input from the main control valve 43 to the loading tool 31, ensuring the normal operation of the loading tool 31. By switching the switch 5 and the safety solenoid valve 21, the excavating handle 22 controls the excavating tool 32, while the loading handle 23 controls the loading tool 31. Furthermore, when the excavating tool 32 is operating, the loading handle 23 cannot control the loading tool 31; and when the loading tool 31 is operating, the excavating handle 22 cannot control the excavating tool 32. This configuration prevents accidental operation of either the excavating tool 32 or the loading tool 31, providing improved safety and reliability.

[0058] Figure 4 A structural diagram of a hydraulic oil circuit sharing system for a backhoe loader according to an embodiment of the present invention is provided. Figure 4 Based on the above embodiments, the switching valve block 34 optionally includes an oil circuit switching solenoid valve 33. The oil circuit switching solenoid valve 33 is connected to the first output end of the main valve module 4 via the first oil circuit Y1 and to the second output end of the main valve module 4 via the second oil circuit Y2. The oil circuit switching solenoid valve 33 is connected to the first input end of the loading-end auxiliary tool 31 via the ninth oil circuit Y9 and to the second input end of the loading-end auxiliary tool 31 via the tenth oil circuit Y10. The oil circuit switching solenoid valve 33 is connected to the first input end of the excavating-end auxiliary tool 32 via the eleventh oil circuit Y11 and to the second input end of the excavating-end auxiliary tool 32 via the twelfth oil circuit Y12. The oil circuit switching solenoid valve 33 is used to supply oil to either the loading-end auxiliary tool 31 or the excavating-end auxiliary tool 32.

[0059] The oil circuit switching solenoid valve 33 can achieve different flow modes depending on the on / off state of the switching switch 5. For example, when the switching switch 5 is off, the oil circuit switching solenoid valve 33 is in the de-energized state and the oil circuit switching solenoid valve 33 is in the right position. The working oil can be input into the loading end auxiliary tool 31 through the ninth oil circuit Y9 or the tenth oil circuit Y10, which is equivalent to the connection between the main control valve 43 and the loading end auxiliary tool 31. The loading end auxiliary tool 31 can be controlled to work by the dial of the loading end handle 23. When the switching switch 5 is closed, the oil circuit switching solenoid valve 33 is in the energized state and the oil circuit switching solenoid valve 33 is in the left position. The working oil can be input into the excavation end auxiliary tool 32 through the eleventh oil circuit Y11 or the twelfth oil circuit Y12, which is equivalent to the connection between the main control valve 43 and the excavation end auxiliary tool 32. The excavation end auxiliary tool 32 can be controlled to work by the dial of the excavation end handle 22. By providing the oil circuit switching solenoid valve 33 , the loading end auxiliary tool 31 and the excavation end auxiliary tool 32 can be switched according to the switching signal of the switching switch 5 .

[0060] On the basis of the above embodiments, optionally, the oil circuit switching solenoid valve 33 includes: a two-position six-way solenoid valve.

[0061] Among them, the two-position six-way solenoid valve has a smaller volume and occupies less space, and the two-position six-way solenoid valve has reliable operation and high stability.

[0062] Figure 5 A structural diagram of a hydraulic oil circuit sharing system for a backhoe loader according to an embodiment of the present invention is provided. Figure 5 Unlike the previous embodiments, the main valve module 4 includes an electrically controlled main valve 44. The input of the electrically controlled main valve 44 is electrically connected to the output of the control module. The first output of the electrically controlled main valve 44 is connected to the end tool switching module 3 via the first oil passage Y1, and the second output of the electrically controlled main valve 44 is connected to the end tool switching module 3 via the second oil passage Y2. The electrically controlled main valve 44 is used to input working oil into the end tool switching module 3 via the first oil passage Y1, and output it to the electrically controlled main valve 44 via the second oil passage Y2, thereby controlling the flow of working oil in the input end tool switching module 3.

[0063] Among them, the electronically controlled main valve 44 can directly adjust the flow rate according to the current signal. Therefore, the oil quantity control signal output by the control module 1 can directly act on the electronically controlled main valve 44. The electronically controlled main valve 44 directly adjusts the flow rate of the working oil in the input end switching module 3 according to the oil quantity control signal. This setting method does not require the use of the first proportional solenoid valve 41 and the second proportional solenoid valve 42, further reducing the occupied space inside the excavator loader.

[0064] The present invention also provides an excavator loader, including the hydraulic oil circuit sharing system of the excavator loader provided by any embodiment of the present invention, which has the corresponding beneficial effects of the hydraulic oil circuit sharing system of the excavator loader, and will not be repeated.

[0065] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0066] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A hydraulic oil circuit sharing system for a backhoe loader, characterized in that: The hydraulic oil circuit common system of the backhoe loader includes: a control module, a handle switching module, an end tool switching module, a main valve module and a switching switch; The input end of the control module is electrically connected to the output end of the handle switching module, and the handle switching module includes at least two operating handles; the operating handles are provided with a dial, and a handle operation signal is generated by dialing the dial; the output end of the control module is electrically connected to the main valve module; the control module is used to convert the handle operation signal into an oil quantity control signal; The main valve module is connected to the oil circuit of the end tool switching module; the main valve module is provided with a first oil circuit and a second oil circuit, and the main valve module is used to input the working oil into the end tool switching module through the first oil circuit, and output it to the main valve module through the second oil circuit, and control the flow rate of the working oil input into the end tool switching module; The end tool switching module includes a loading end tool, an excavating end tool, and a switching valve block. The two tools share the first oil circuit and the second oil circuit. The module is used to input the working oil input by the main valve module into the switching valve block. The switching valve block is used to input the working oil into the loading end tool or the excavating end tool. The handle switching module is provided with a third oil circuit and a fourth oil circuit, the third oil circuit is used to input pilot oil to the operating handle and return oil through the fourth oil circuit; The switching switch is connected between the handle switching module and the power supply; the switching switch is also connected between the end tool switching module and the power supply; and the switching switch is also connected between the control module and the power supply; the switching switch is used to control the switching of the loading end auxiliary tool and the excavation end auxiliary tool in the end tool switching module, and the control module is used to receive the handle operation signals of different operating handles in the handle switching module according to the connection and disconnection between it and the power supply.

2. The hydraulic oil circuit sharing system of the backhoe loader according to claim 1, characterized in that: The main valve module includes: a first proportional solenoid valve, a second proportional solenoid valve and a main control valve; The input ends of the first proportional solenoid valve and the second proportional solenoid valve are electrically connected to the output end of the control module; the first input end of the main control valve is connected to the output end oil circuit of the first proportional solenoid valve, the second input end of the main control valve is connected to the output end oil circuit of the second proportional solenoid valve, the first output end of the main control valve is connected to the end tool switching module through the first oil circuit, and the second output end of the main control valve is connected to the end tool switching module through the second oil circuit; The first proportional solenoid valve and the second proportional solenoid valve are used to control the flow distribution of the working oil in the main control valve according to the oil quantity control signal.

3. The hydraulic oil circuit sharing system of the backhoe loader according to claim 2, characterized in that: The main control valve is a hydraulic control main valve.

4. The hydraulic oil circuit sharing system of the backhoe loader according to claim 2, characterized in that: The main valve module further includes: a relief valve, an oil replenishment one-way valve, a fifth oil circuit and a sixth oil circuit; The main control valve inputs the working oil into the end tool switching module through the fifth oil passage, and outputs the refluxed working oil to the recovery tank through the sixth oil passage; The relief valve includes a first relief valve and a second relief valve; the oil replenishment check valve includes a first oil replenishment check valve and a second oil replenishment check valve; the first relief valve and the first oil replenishment check valve are connected between the first oil circuit and the sixth oil circuit, and the second relief valve and the second oil replenishment check valve are connected between the second oil circuit and the sixth oil circuit.

5. The hydraulic oil circuit sharing system of the backhoe loader according to claim 1, characterized in that: The handle switching module includes a safety solenoid valve; The switching signal input end of the safety solenoid valve is electrically connected to the switching switch, the safety solenoid valve is connected to the pilot oil supply equipment through the third oil circuit, and the safety solenoid valve is connected to the recovery oil tank through the fourth oil circuit. The safety solenoid valve is used to control the pilot oil input into the operating handle of the excavation end according to the opening and closing signal of the switching switch.

6. The hydraulic oil circuit sharing system of the backhoe loader according to claim 5, characterized in that: The operating handle includes an excavation end handle and a loading end handle; The safety solenoid valve is connected to the excavation end handle via a seventh oil circuit, the excavation end handle is connected to the recovery oil tank via an eighth oil circuit, and the signal output end of the excavation end handle is electrically connected to the control module; The loading end handle is connected to the pilot oil supply device through the third oil circuit, the loading end handle is connected to the recovery oil tank through the ninth oil circuit, and the signal output end of the loading end handle is electrically connected to the control module.

7. The hydraulic oil circuit sharing system of the backhoe loader according to claim 1, characterized in that: The switching valve block includes: an oil circuit switching solenoid valve; The oil circuit switching solenoid valve is connected to the first output end of the main valve module through the first oil circuit, and the oil circuit switching solenoid valve is connected to the second output end of the main valve module through the second oil circuit; the oil circuit switching solenoid valve is connected to the first input end of the loading end auxiliary tool through the ninth oil circuit, and the oil circuit switching solenoid valve is connected to the second input end of the loading end auxiliary tool through the tenth oil circuit; the oil circuit switching solenoid valve is connected to the first input end of the excavation end auxiliary tool through the eleventh oil circuit, and the oil circuit switching solenoid valve is connected to the second input end of the excavation end auxiliary tool through the twelfth oil circuit; the oil circuit switching solenoid valve is used to supply oil to the loading end auxiliary tool or the excavation end auxiliary tool.

8. The hydraulic oil circuit sharing system of the backhoe loader according to claim 7, characterized in that: The oil circuit switching solenoid valve includes: a two-position six-way solenoid valve.

9. The hydraulic oil circuit sharing system of the backhoe loader according to claim 1, characterized in that: The main valve module includes: an electrically controlled main valve; The input end of the electrically controlled main valve is electrically connected to the output end of the control module, the first output end of the electrically controlled main valve is connected to the end tool switching module through the first oil circuit, and the second output end of the electrically controlled main valve is connected to the end tool switching module through the second oil circuit; the electrically controlled main valve is used to input the working oil into the end tool switching module through the first oil circuit, and output it to the electrically controlled main valve through the second oil circuit, and control the flow rate of the working oil input into the end tool switching module.

10. A backhoe loader, characterized in that: The backhoe loader comprises the hydraulic oil circuit sharing system for backhoe loaders according to any one of claims 1-8.

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