Multi-way valve multifunctional valve body assembly and loader-digger

Abstract

The utility model discloses a multi-way valve multifunctional valve body assembly and a backhoe loader. The multi-way valve multifunctional valve body assembly comprises a valve body, a main valve element assembly, an end cover assembly I, an end cover assembly II, a pilot electromagnetic valve I and a pilot electromagnetic valve II. The valve body is provided with a plurality of oil ports and a plurality of oil ducts; the main valve element assembly comprises a main valve element and a spring. The main valve element is arranged in the valve body in a penetrating mode and can axially move in the valve body. The end cover assembly I is fixed on the valve body close to one end of the main valve core in the length direction and is used for sealing and limiting the main valve core; the end cover assembly II is fixed on the valve body close to the other end of the main valve core in the length direction and is used for sealing and limiting the main valve core; the spring is located in the end cover assembly II and arranged on the main valve element in a sleeving mode, and the moved main valve element is reset. And the pilot electromagnetic valve I and the pilot electromagnetic valve II are respectively fixed on the valve body and are used for driving the main valve core to axially move so as to communicate the corresponding oil port and the oil duct, so that four functions of lifting, descending, neutral position and floating can be realized for the actuating mechanism.

Description

Technical Field

[0001] This utility model relates to a multi-way valve body assembly, belonging to the field of excavator loaders. Background Technology

[0002] To adapt to different terrains and improve operational adaptability, and to buffer impacts when encountering hard obstacles or uneven surfaces during excavation or loading, reducing damage to the equipment, a floating function needs to be added to the ordinary lifting and lowering functions. While ensuring functional implementation, the demand for operational comfort for each function is also increasing. However, current technologies only offer many solutions for implementing the four-position (lifting, lowering, neutral, and floating) functions, but the valve body assembly structure is relatively complex and does not address operability issues. This invention mainly addresses these problems by proposing an optimized solution for the valve body assembly structure.

[0003] Existing patents disclose an electro-hydraulic proportional multi-way valve with a floating position (CN 221220988 U), but this technology has the following shortcomings:

[0004] 1. This patent only implements a simple function and does not optimize for the impact of the action;

[0005] 2. The patent uses a stepped limiting block on the valve core to achieve the relevant functions, which complicates the manufacturing process and increases the risk of actual use.

[0006] 3. The valve core assembly in this patent contains many parts and is complex to assemble;

[0007] 4. The pilot solenoid valve of this patent is located on one side, and the processing of the end cap and valve body is complicated, resulting in a low degree of integration;

[0008] 5. The end cap part of this patent only has an electronic pilot control and does not have an emergency manual function. Summary of the Invention

[0009] The technical problem this invention aims to solve is to optimize the structure and performance of existing loading end valve body assemblies for excavators and loaders. This invention provides a multi-way valve body assembly that, by setting the cooperative relationship between the valve core and the valve body, achieves a four-position function (lifting, lowering, neutral, and floating) with a single spring structure. This simplifies the existing dual-spring valve core structure on the market, while also adding a bypass groove to the valve core, improving the impact of operation and integrating an emergency manual function.

[0010] This utility model is achieved according to the following technical solution:

[0011] In a first aspect, this utility model provides a multi-way valve body assembly, comprising:

[0012] The valve body is equipped with multiple oil ports and multiple oil passages;

[0013] The main valve core assembly includes a main valve core and a spring; the main valve core passes through the valve body with a clearance fit between them, and the main valve core is axially movable within the valve body;

[0014] End cap assembly I is fixed to the valve body at one end near the length of the main valve core and is used to seal and limit the main valve core.

[0015] End cap assembly II is fixed to the valve body at the other end of the main valve core along its length and is used to seal and limit the main valve core; the spring is located in end cap assembly II and is fitted onto the main valve core to reset the main valve core after it has moved.

[0016] Pilot solenoid valve I and pilot solenoid valve II are respectively fixed on the valve body and are used to drive the main valve core to move axially to connect the corresponding oil port and oil passage, thereby enabling the actuator to perform four functions: lifting, lowering, neutral position, and floating.

[0017] In some embodiments, the valve body is provided with an oil inlet (P), a working port (A), a working port (B), a return port (T), oil passage I, oil passage II, and oil passage III.

[0018] In some embodiments, when the main valve core is in the neutral position, all channels between the P inlet, T return port, A working port, and B working port are blocked, and no oil flows. At this time, the actuator position is locked. The pilot solenoid valve I is energized, the pilot chamber pressure increases, the main valve core reverses, and is limited by the end cover assembly I. The oil passage from the P inlet to the B working port opens, and the oil enters the B working port through oil passage I, oil passage II, and oil passage III. The channel from the A working port to the T return port opens, and the actuator is lifted.

[0019] In some embodiments, the current supplied to pilot solenoid valve II is limited, the pilot chamber pressure rises to the limited value, the main valve core reverses, the channel from P inlet to A working port opens, oil enters A working port through oil passage I and oil passage II, the channel from B working port to T return port opens, oil flows to T return port through oil passage III, and the actuator falls; pilot solenoid valve II is supplied with the maximum current, the pilot chamber pressure rises, the main valve core completely reverses, and is limited by end cap assembly II, the channels from A working port and B working port to T return port open, the remaining oil passages are sealed, and the actuator enters the floating function.

[0020] In some embodiments, the main valve core assembly further includes a pin hook located in the end cap assembly II and fixedly connected to the end of the main valve core; the pin hook connector on the end cap assembly II is connected to the pin hook, and the main valve core is controlled to change direction by rotating the pin hook connector.

[0021] In some embodiments, the pilot solenoid valve I is mounted on the valve body near the end cap assembly II, and the pilot chamber is located in the end cap assembly II; the pilot solenoid valve II is mounted on the valve body near the end cap assembly I, and the pilot chamber is located in the end cap assembly I.

[0022] In some embodiments, the main valve core is a stepped shaft, and at least one bypass groove is provided on the main valve core to provide an additional oil flow channel in the valve body to mitigate the impact caused by oil flow.

[0023] In some embodiments, when the pilot solenoid valve I is energized, the pilot chamber pressure increases. During the main valve core switching process, the bypass groove opens, and the oil flows from the P inlet through oil passage I to oil passage II. In oil passage II, the oil flows to two parts: one part enters the B working port normally through oil passage III, and the other part flows through the bypass groove and the A working port to the T return port.

[0024] Secondly, this utility model provides an excavator loader, including the aforementioned multi-way valve multi-functional valve body assembly.

[0025] The beneficial effects of this utility model are:

[0026] 1. The multi-way valve body assembly proposed in this utility model has a novel structure, is simple to process, and is easy to assemble;

[0027] 2. The multi-way valve body assembly proposed in this utility model significantly improves and optimizes the problem of impact during operation, and has strong practicality.

[0028] 3. The multi-way valve body assembly proposed in this utility model adds a manual emergency function, effectively avoiding many unexpected situations and significantly improving the overall safety of the machine. At the same time, through optimization of the valve core, it mitigates impacts in various usage scenarios, greatly improving the overall operating comfort of the machine.

[0029] 4. The multi-way valve body assembly proposed in this utility model simplifies the end cap, reducing the difficulty of debugging the main valve after installation, maintaining the entire valve, and optimizing and replacing the valve stem. Attached Figure Description

[0030] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0031] In the attached diagram:

[0032] Figure 1This is a cross-sectional view of a multi-way valve body assembly according to the present invention. Figure 1 ;

[0033] Figure 2 This is a structural diagram of the main valve core of this utility model;

[0034] Figure 3 This is a structural diagram of the end cap assembly II of this utility model;

[0035] Figure 4 This is a cross-sectional view of a multi-way valve body assembly according to the present invention. Figure 2 .

[0036] Figure labels: Valve body 1, main valve core 2, spring 3, pin hook 4, end cover assembly I 5, end cover assembly II 6, pilot solenoid valve I 7, pilot solenoid valve II 8, through groove 2-1, pin hook connector 6-1, pilot chamber 7-1, pilot chamber 8-1, P oil inlet 101, A working port 102, B working port 103, T oil return port 104, oil passage I 105, oil passage II 106, oil passage III 107.

[0037] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0039] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] like Figure 1 As shown, this utility model provides a multi-way valve body assembly, including a valve body 1, a main valve core assembly, an end cap assembly I5, an end cap assembly II6, a pilot solenoid valve I7, and a pilot solenoid valve II8; the valve body 1 is provided with multiple oil ports and multiple oil passages; the main valve core assembly includes a main valve core 2 and a spring 3; the main valve core 2 passes through the valve body 1, and the two are clearance-fitted, allowing the main valve core 2 to move axially within the valve body 1; the end cap assembly I5 is fixed to the valve body 1 near one end of the main valve core 2 along its length, for use in... The main valve core 2 is sealed and limited; the end cap assembly II 6 is fixed on the valve body 1 near the other end of the main valve core 2 along its length, and is used to seal and limit the main valve core 2; the spring 3 is located in the end cap assembly II 6 and is fitted on the main valve core 2 to reset the main valve core 2 after it has been moved; the pilot solenoid valve I 7 and the pilot solenoid valve II 8 are respectively fixed on the valve body 1, and are used to drive the main valve core 2 to move axially to connect the corresponding oil port and oil passage, thereby enabling the actuator to achieve four functions: lifting, lowering, neutral position, and floating.

[0042] It should be noted that the floating function means that the loader's working device can float relatively freely up and down under different loads, without being subject to precise position control.

[0043] The following provides a further explanation of the specific structure of the valve body described above.

[0044] like Figure 1 As shown, valve body 1 is provided with P oil inlet 101, A working port 102, B working port 103, T oil return port 104, oil passage I 105, oil passage II 106, and oil passage III 107.

[0045] Basic function implementation: When the main valve core 2 is in the neutral position, all channels between P oil inlet 101, T oil return 104, A working port 102, and B working port 103 are blocked, and there is no oil flow. At this time, the actuator position is locked.

[0046] When the pilot solenoid valve I7 is energized, the pressure in the pilot chamber 7-1 increases, the main valve core 2 reverses, and is limited by the end cover assembly I5. At this time, the oil passage from P inlet 101 to B working port 103 is opened, and the oil enters B working port 103 through oil passage I 105, oil passage II 106 and oil passage III 107. The channel from A working port 102 to T return port 104 is opened, and the actuator is lifted.

[0047] The current supplied to the pilot solenoid valve II8 is limited, the pressure in the pilot chamber 8-1 is increased to the limit value, the main valve core 2 is reversed, at this time the channel from P inlet port 101 to A working port 102 is opened, the oil enters A working port 102 through oil passage I 105 and oil passage II 106, the channel from B working port 103 to T return port 104 is opened, the oil flows to T return port 104 through oil passage III 107, and the actuator falls;

[0048] When the pilot solenoid valve II8 is energized with the maximum current, the pressure in the pilot chamber 8-1 increases, the main valve core 2 is completely reversed, and the end cover assembly II6 is used for limiting. At this time, the channels from working port A 102 and working port B 103 to return port T 104 are opened, the other oil passages are sealed, and the actuator enters the floating function.

[0049] Further options, such as Figure 2 As shown, the main valve core 2 is a stepped shaft, and at least one bypass groove 2-1 is provided on the main valve core 2, which provides an additional oil flow channel in the valve body 1 to reduce the impact caused by the oil flow.

[0050] The principle of bypass grooves in mitigating impact is as follows: Figure 4 As shown: When the pilot solenoid valve I7 is energized, the pressure in the pilot chamber 7-1 gradually increases. During the reversal of the main valve core 2, the bypass groove 2-1 opens, and the oil flows from the P inlet 101 through the oil passage I 105 to the oil passage II 106. In the oil passage II 106, the oil flows in two parts. One part enters the B working port 103 normally through the oil passage III 107, and the other part flows through the bypass groove 2-1 and the A working port 102 to the T return port 104. This reduces the flow rate impacting the oil working device when the main valve is opened. When the reversal of the main valve core 2 is completed, the bypass groove 2-1 is blocked, and all the oil enters the B working port 103 normally through the oil passage III 107, without affecting the performance parameters of normal function.

[0051] Further options, such as Figure 1 , Figure 3 As shown, the main valve core assembly also includes a pin 4, which is located in the end cap assembly II 6 and is fixedly connected to the end of the main valve core 2. The pin hook connector 6-1 on the end cap assembly II 6 is connected to the pin hook 4, and the main valve core 2 can be reversed externally by rotating the pin hook connector 6-1. The pilot solenoid valve I 7, the pilot solenoid valve II 8, and the pilot-related oil passages are all integrated on the valve body 1, so that the pilot oil reaches the pilot chamber 7-1 and the pilot chamber 8-1 through the internal oil passages of the valve body, which simplifies the processing technology of the end cap assembly I 5 and the end cap assembly II 6 and improves the integration degree of the valve body.

[0052] In summary, this utility model provides a multi-way valve body assembly that achieves the following functions and effects:

[0053] 1. The multi-way valve body assembly proposed in this utility model has a novel structure, is simple to process, and is easy to assemble;

[0054] 2. The multi-way valve body assembly proposed in this utility model significantly improves and optimizes the problem of impact during operation, and has strong practicality.

[0055] 3. The multi-way valve body assembly proposed in this utility model adds a manual emergency function, effectively avoiding many unexpected situations and significantly improving the overall safety of the machine. At the same time, through optimization of the valve core, it mitigates impacts in various usage scenarios, greatly improving the overall operating comfort of the machine.

[0056] 4. The multi-way valve body assembly proposed in this utility model simplifies the end cap, reducing the difficulty of debugging the main valve after installation, maintaining the entire valve, and optimizing and replacing the valve stem.

[0057] The excavator loader provided by this utility model is described below. The excavator loader described below can be referred to in correspondence with the multi-way valve multi-functional valve body assembly described above.

[0058] The present invention provides an excavator loader, which may include a multi-way valve body assembly as described in any of the above embodiments.

[0059] The beneficial effects achieved by the excavator loader provided by this utility model are consistent with the beneficial effects achieved by the multi-way valve and multi-functional valve body assembly provided by this utility model, so they will not be repeated here.

[0060] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0061] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0062] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A multi-way valve body assembly, characterized in that, include: The valve body is equipped with multiple oil ports and multiple oil passages; The main valve core assembly includes a main valve core and a spring; the main valve core passes through the valve body with a clearance fit between them, and the main valve core is axially movable within the valve body; End cap assembly I is fixed to the valve body at one end near the length of the main valve core and is used to seal and limit the main valve core. End cap assembly II is fixed to the valve body at the other end of the main valve core along its length and is used to seal and limit the main valve core; the spring is located in end cap assembly II and is fitted onto the main valve core to reset the main valve core after it has moved. Pilot solenoid valve I and pilot solenoid valve II are respectively fixed on the valve body and are used to drive the main valve core to move axially to connect the corresponding oil port and oil passage, thereby enabling the actuator to perform four functions: lifting, lowering, neutral position, and floating.

2. The multi-way valve body assembly according to claim 1, characterized in that: The valve body is provided with an oil inlet (P), a working port (A), a working port (B), a return port (T), oil passage I, oil passage II, and oil passage III.

3. The multi-way valve body assembly according to claim 2, characterized in that: When the main valve core is in the neutral position, all channels between the P inlet port, T return port, A working port, and B working port are blocked, and there is no oil flow. At this time, the actuator position is locked. When pilot solenoid valve I is energized, the pressure in the pilot chamber increases, the main valve core reverses, and is limited by end cover assembly I. The oil passage from P inlet to B working port opens, and the oil enters B working port through oil passage I, oil passage II and oil passage III. The passage from A working port to T return port opens, and the actuator is lifted.

4. The multi-way valve body assembly according to claim 2, characterized in that: The current supplied to pilot solenoid valve II is limited, the pilot chamber pressure rises to the limit value, the main valve core reverses, the channel from P inlet to A working port opens, the oil enters A working port through oil passage I and oil passage II, the channel from B working port to T return port opens, the oil flows to T return port through oil passage III, and the actuator falls. When the pilot solenoid valve II is supplied with the maximum current, the pilot chamber pressure increases, the main valve core is completely reversed, and the end cover assembly II provides a limit. The channels from working port A and working port B to return port T are opened, while the remaining oil passages are sealed, and the actuator enters the floating function.

5. A multi-way valve body assembly according to claim 1, characterized in that: The main valve core assembly also includes a pin hook, which is located in the end cap assembly II and is fixedly connected to the end of the main valve core; the pin hook connector on the end cap assembly II is connected to the pin hook, and the main valve core is controlled to switch directions by rotating the pin hook connector.

6. The multi-way valve body assembly according to claim 1, characterized in that: The pilot solenoid valve I is mounted on the valve body near the end cap assembly II, and the pilot chamber is located in the end cap assembly II; the pilot solenoid valve II is mounted on the valve body near the end cap assembly I, and the pilot chamber is located in the end cap assembly I.

7. A multi-way valve body assembly according to claim 2, characterized in that: The main valve core is a stepped shaft, and at least one bypass groove is provided on the main valve core, which provides an additional oil flow channel in the valve body to reduce the impact caused by the oil flow.

8. A multi-way valve body assembly according to claim 7, characterized in that: When pilot solenoid valve I is energized, the pressure in the pilot chamber increases. During the main valve core switching process, the bypass groove opens, and the oil flows from the P inlet through oil passage I to oil passage II. In oil passage II, the oil flows to two parts: one part enters the B working port normally through oil passage III, and the other part flows through the bypass groove and the A working port to the T return port.

9. A backhoe loader, characterized in that: Includes the multi-way valve body assembly as described in any one of claims 1 to 8.

Images