CN-224200891-U - Multi-way valve multifunctional valve body assembly and backhoe loader

CN224200891UCN 224200891 UCN224200891 UCN 224200891UCN-224200891-U

Abstract

The utility model discloses a multi-way valve multifunctional valve body assembly and an excavating loader, which comprises a valve body, a main valve core assembly, an end cover assembly I, an end cover assembly II, a pilot electromagnetic valve I and a pilot electromagnetic valve II, wherein the valve body is provided with a plurality of oil ports and a plurality of oil channels, the main valve core assembly comprises a main valve core and a spring, the main valve core is arranged on the valve body in a penetrating mode, the main valve core 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 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 used for sealing and limiting the main valve core, the spring is arranged in the end cover assembly II and sleeved on the main valve core and used for resetting the moved main valve core, and the pilot electromagnetic valve I and the pilot electromagnetic valve II are respectively fixed on the valve body and used for driving the main valve core to axially move to communicate the corresponding oil ports and the oil channels, and the actuating mechanism can realize four functions of lifting, descending, middle position and floating.

Inventors

ZHANG XIAOHANG
LIU WANLIANG
Ming Xuze
QI ZHENHONG
TANG JIANFENG

Assignees

徐州阿马凯液压技术有限公司

Dates

Publication Date: 20260505
Application Date: 20250627

Claims (9)

1. A multi-way valve multi-function valve body assembly, comprising: the valve body is provided with a plurality of oil ports and a plurality of oil channels; the main valve core assembly comprises a main valve core and a spring, wherein the main valve core is arranged in the valve body in a penetrating way, and is in clearance fit with the valve body, and the main valve core 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 spring is positioned in the end cover assembly II, sleeved on the main valve core and used for resetting the main valve core after moving; 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 shaft to move axially to communicate corresponding oil ports and oil ducts, so that four functions of lifting, descending, middle position and floating of the actuating mechanism can be realized.
2. The multi-way valve multi-function valve body assembly of claim 1, wherein: And the valve body is provided with a P oil inlet, an A working port, a B working port, a T oil return port, an oil duct I, an oil duct II and an oil duct III.
3. A multi-way valve multi-function valve body assembly according to claim 2, wherein: when the main valve core is in the middle position, all channels among the P oil inlet, the T oil return port, the A working port and the B working port are blocked, no oil flows, and the position of the actuating mechanism is locked at the moment; The pilot electromagnetic valve I is powered on, the pressure of the pilot cavity is increased, the main valve core is reversed, the end cover assembly I is used for limiting, the oil passage from the P oil inlet to the B working port is opened, oil enters the B working port through the oil passage I, the oil passage II and the oil passage III, the passage from the A working port to the T oil return port is opened, and the actuating mechanism is lifted.
4. A multi-way valve multi-function valve body assembly according to claim 2, wherein: limiting the current fed into the pilot electromagnetic valve II, lifting the pressure of the pilot cavity to a limiting value, reversing a main valve core, opening a channel from a P oil inlet to an A working port, enabling oil to enter the A working port through an oil duct I and an oil duct II, opening a channel from the B working port to a T oil return port, enabling oil to flow to the T oil return port through an oil duct III, and enabling an actuating mechanism to fall; The pilot electromagnetic valve II is connected with maximum current, the pressure of a pilot cavity is improved, the main valve core is completely reversed, limiting is carried out by means of the end cover assembly II, channels from the working port A to the oil return port B to the oil return port T are opened, other oil channels are sealed, and the actuating mechanism enters a floating function.
5. The multi-way valve multi-function valve body assembly of claim 1, wherein: The main valve core assembly further comprises a pin hook, the pin hook is located in the end cover assembly II and fixedly connected with the end portion of the main valve core, a pin hook connecting piece on the end cover assembly II is connected with the pin hook, and the main valve core is controlled to change direction through rotating the pin hook connecting piece.
6. The multi-way valve multi-function valve body assembly of claim 1, wherein: The pilot electromagnetic valve I is arranged on the valve body close to the end cover assembly II, the pilot cavity is arranged in the end cover assembly II, the pilot electromagnetic valve II is arranged on the valve body close to the end cover assembly I, and the pilot cavity is arranged in the end cover assembly I.
7. A multi-way valve multi-function valve body assembly according to claim 2, wherein: The main valve core is a stepped shaft, at least one bypass groove is formed in the main valve core, and an additional oil flow channel is formed in the valve body and used for relieving impact caused by oil flow.
8. The multi-way valve multi-function valve body assembly of claim 7, wherein: The pilot electromagnetic valve I is powered on, the pressure of the pilot cavity is increased, the bypass groove is opened in the reversing process of the main valve core, oil flows from the P oil inlet to the oil duct II through the oil duct I, and in the oil duct II, the oil flows to two parts, one part normally enters the working port B through the oil duct III, and the other part flows to the oil return port T through the bypass groove and the working port A.
9. An excavating loader characterized by: A multi-way valve comprising the multi-way valve multi-function valve body assembly of any one of claims 1 to 8.

Description

Multi-way valve multifunctional valve body assembly and backhoe loader Technical Field The utility model relates to a multi-way valve multifunctional valve body component, belonging to a backhoe loader Background The loader-digger is adapted to different terrain operations, improves the operation adaptability, and buffers impact when encountering hard obstacles or uneven surfaces during the process of digging or loading, reduces impact and damage to equipment, and needs to add a floating function in common lifting and lowering functions. While ensuring the realization of the functions, the demand for the actual operation comfort of each function is also increasing. However, in the prior art, a plurality of schemes are only provided for realizing four-bit (lifting, descending, middle-position and floating) functions, but the valve body assembly structure is complex and is not concerned with operability problems. The prior patent discloses an electro-hydraulic proportional multi-way valve (CN 221220988U) with a floating position, and the technology has the following defects: 1. The patent only realizes simple functions and is not optimized for the impact of actions; 2. In the patent, related functions are realized through the stepped limiting block on the valve core, so that the processing technology is complicated, and the actual use risk is increased; 3. The valve core component in the patent comprises a plurality of parts and is complex to assemble; 4. The pilot electromagnetic valve is positioned at one side, the end cover and the valve body are complex to process, and the integration degree is low; 5. The patent end cover part only has an electric control pilot, and no emergency manual function is provided. Disclosure of Invention The utility model aims to solve the technical problems of structure and performance optimization of a valve body assembly at a loading end of an existing backhoe loader. The utility model provides a multi-way valve multifunctional valve body component, which realizes the integrated 4-position function of a valve core by arranging the matching relation between the valve core and the valve body and using a single spring structure, namely lifting, descending, middle position and floating, simplifies the structure of the double-spring valve core in the existing market, simultaneously increases a valve core bypass groove, improves the impact of actions and integrates the emergency manual function. The utility model is realized according to the following technical scheme: In a first aspect, the present utility model provides a multi-way valve multi-function valve body assembly comprising: the valve body is provided with a plurality of oil ports and a plurality of oil channels; the main valve core assembly comprises a main valve core and a spring, wherein the main valve core is arranged in the valve body in a penetrating way, and is in clearance fit with the valve body, and the main valve core 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 spring is positioned in the end cover assembly II, sleeved on the main valve core and used for resetting the main valve core after moving; 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 shaft to move axially to communicate corresponding oil ports and oil ducts, so that four functions of lifting, descending, middle position and floating of the actuating mechanism can be realized. In some embodiments, the valve body is provided with a P oil inlet, an a working port, a B working port, a T oil return port, an oil passage I, an oil passage II, and an oil passage III. In some embodiments, when the main valve core is in the middle position, all channels between the P oil inlet, the T oil return port, the A working port and the B working port are blocked, no oil flows, the position of the actuating mechanism is locked, the pilot electromagnetic valve I is electrified, the pressure of the pilot cavity is lifted, the main valve core is reversed and limited by virtue of the end cover component I, the oil channels from the P oil inlet to the B working port are opened, the oil enters the B working port through the oil channels I, the oil channels II and the oil channels III, the channels from the A working port to the T oil return port are opened, and the actuating mechanism is lifted. In some embodiments, the current fed into the pilot electromagnetic valve II is limited, the pressure of the pilot cavity is increased to a limiting value, the main valve core is reversed, a channel from a P oil inlet to an A working port is opened, oil enters the A working port through an oil duct I and an oil duct II, a channel from a B working port to a T oil return port is opened, the oil flows to the T oil