Excavating main control valve for backhoe loader

Abstract

The utility model relates to the technical field of engineering machinery control, in particular to an excavation main control valve for a backhoe loader, which comprises a valve body with a hydraulic channel, and the valve body sequentially comprises an oil inlet joint, an excavation joint, a support leg joint and a tail joint which are hermetically connected in series into a whole; the excavating unit and the supporting leg unit are three-position six-way manual valves, and an electromagnetic valve is arranged on the tail unit; the number of the excavating units is four, and the number of the supporting leg units is two. Wherein the oil inlet connector is provided with an oil pump connector communicated with the hydraulic channel; the tail connector is further provided with an X connector and an oil tank connector which are communicated with the hydraulic channel; pressure regulating assemblies A used for limiting and stabilizing pressure are arranged between the hydraulic channel and the opening A and the opening B of the excavation unit, and each pressure regulating assembly A comprises an oil supplementing one-way valve A and an overload overflow valve A which are connected into a whole in parallel; in the using process, the excavating unit and the supporting rod unit complete hydraulic oil circulation through the hydraulic channel; oil pressure adjustment is conducted through the pressure adjusting assembly A, it is guaranteed that excavation movement is conducted rapidly and stably, and unified specification production is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery control, in particular to an excavation main control valve for an excavator loader. Background Art

[0002] As a multifunctional small-scale engineering machine that integrates the characteristics of traditional excavators and traditional loaders, the backhoe loader can perform shoveling operations in loading mode and excavation operations in excavation mode. For example, the backhoe loader disclosed in Chinese invention patent CN100537908C has an excavation part that includes a bucket, a dipper rod and a boom that are hinged to each other in sequence and driven by corresponding cylinders, and a stabilizing support leg driven by two support leg cylinders to be raised and lowered is provided on the vehicle body. With the development of technology, the boom is hinged to the slewing seat, and the slewing seat is hinged to the vehicle body and driven to swing by the yaw cylinder. For example, the backhoe loader excavation end working device disclosed in Chinese invention patent CN107514020A has a boom hinged to the slewing support. However, when the excavation part is in operation, the main control valve is required to control each action to be stable and fast, and the existing backhoe loaders have various forms and combinations and need to expand functions, resulting in different specifications of the excavation main control valve.

[0003] Therefore, for existing excavator loaders, it is urgent to design a main control valve that takes into account all parts of the excavation structure and can expand functions, so as to facilitate the use of the main control valve and unify its specifications. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects and shortcomings of the prior art. To this end, the utility model provides an excavation main control valve for an excavator loader, which can unify the specifications of the main control valve and expand its functions while ensuring stable and rapid excavation action, making it easy to use.

[0005] To achieve the above-mentioned object, the utility model provides an excavation main control valve for an excavator loader, comprising a valve body with a hydraulic channel, the valve body sequentially comprising an oil inlet link, an excavation link, an outrigger link, and a tail link, which are sealed and serially connected as one; the excavation link and the outrigger link are three-position six-way manual valves, and the tail link is provided with a solenoid valve; the number of the excavation links is four, and the number of the outrigger links is two;

[0006] The oil inlet connection is provided with an oil pump interface communicating with the hydraulic channel; the tail connection is also provided with an X interface and an oil tank interface communicating with the hydraulic channel; a pressure regulating assembly A for limiting and stabilizing pressure is provided between the hydraulic channel and ports A and B of the excavation connection. The pressure regulating assembly A includes an oil replenishment check valve A and an overload relief valve A connected in parallel.

[0007] The excavation link and the outrigger link both complete the hydraulic oil circulation through the hydraulic channel; the solenoid valve on the tail link is used to reverse the hydraulic oil in the hydraulic channel and transmit the flow of the hydraulic oil through the X interface.

[0008] Furthermore, the hydraulic channel includes an oil inlet circuit and an annular oil circuit that are connected to each other; the oil inlet circuit is provided with a one-way valve C for isolating it from the annular oil circuit, and the one-way valve C is sealably and detachably arranged on the tail joint; one end of the annular oil circuit is provided with two intermittently separated plugs, and the plug seal is sealably and detachably arranged on the oil inlet joint.

[0009] Furthermore, the oil inlets of the excavation joint and the support leg joint are both provided with a one-way valve D and are connected to the oil pump interface and the oil tank interface through the oil inlet path, and the oil outlets are both connected to the oil tank interface through the annular oil path.

[0010] Furthermore, the hydraulic channel also includes a loading oil circuit communicated with the oil tank interface, and the loading oil circuit is connected to the middle position of the excavation link and the leg link; the oil inlet link is provided with an HPCO interface communicated with the loading oil circuit.

[0011] Furthermore, the valve body also includes a spare joint located between the support leg joint and the tail joint; the spare joint is a three-position six-way manual valve; the oil inlet of the spare joint is provided with a one-way valve E connected to the oil inlet circuit, and the oil outlet is connected to the annular oil circuit; the loading oil circuit is connected to the middle position of the spare joint.

[0012] Furthermore, a pressure regulating assembly B for limiting and stabilizing pressure is provided between the annular oil circuit and the A and B ports of the backup link. The pressure regulating assembly B includes an oil replenishment one-way valve B and an overload relief valve B connected in parallel.

[0013] Compared with the existing technology, the beneficial effects of the present invention are: the four excavation links and two support rod links can meet the use of existing excavator loaders, making the overall structure compact and the specifications uniform; at the same time, the pressure stabilizing component can ensure the stability of the pressure at the A port and the B port on the excavation link and the support rod link, ensuring that the excavation action is completed quickly; the solenoid valve and the X interface on the tail link can control the clamping cylinder of the external clamping tool, which is conducive to the rapid completion of the excavation action. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present utility model.

[0015] Figure 2 for Figure 1 Right view of .

[0016] Figure 3 for Figure 1 Top view of .

[0017] Figure 4 The hydraulic principle diagram of the utility model after rotation.

[0018] Wherein: 1, oil inlet association; 2, excavating association; 3, support rod association; 4, tail association; 5, spare association; 6, oil inlet path; 7, annular oil path; 8, loading oil path; 11, oil pump interface; 12, HPCO interface; 13, plug; 21, check valve D; 22, pressure regulating assembly A; 41, X interface; 42, oil tank interface; 43, check valve C; 51, check valve E; 52, pressure regulating assembly B. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0020] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. EMBODIMENT

[0021] Please refer to Figures 1 to 4 The utility model provides a kind of excavating main control valve for excavator, including including valve body with hydraulic passage, wherein, valve body includes sealing string in tail cap 1, excavating association 2, support rod association 3 and tail association 4 successively as a whole;Excavating association 2 and support rod association 3 are three-position six-way manual valve, and electromagnetic valve is provided on tail association 4;The number of excavating association 2 is four, and the number of support rod association 3 is two;

[0022] Oil pump interface 11 that is communicated with hydraulic passage is provided on the oil inlet association 1 here;X interface 41 and oil tank interface 42 that are communicated with hydraulic passage are further provided on tail association 4;Pressure regulating assembly A 22 is provided between the A port and B port of excavating association 2 and hydraulic passage, and the pressure regulating assembly A 22 includes oil supplement check valve A and overload overflow valve A that are connected in parallel as a whole, so that pressure regulating assembly A 22 has the functions of one-way oil supplement and overload overflow, to achieve the effects of pressure limiting and pressure stabilizing,

[0023] During operation, the four excavation links 2 control the corresponding bucket, arm, boom, and yaw cylinders, respectively, while the two support links 3 control the outrigger cylinders. Accordingly, hydraulic oil circulates through hydraulic channels in both the excavation links 2 and the support links 3. Pressure regulating assembly A22 controls oil overflow and oil replenishment at ports A and B of the excavation link 2, maintaining corresponding pressures and ensuring stable and rapid excavation. For example, the oil pressure at ports A1 and B1 corresponding to the yaw cylinder is maintained at 240 bar; the oil pressure at port A2 corresponding to the bucket cylinder is maintained at 310 bar, and the oil pressure at port B2 is maintained at 240 bar; the oil pressure at port A3 corresponding to the arm cylinder is maintained at 270 bar, and the oil pressure at port B3 is maintained at 280 bar; and the oil pressure at ports A4 and B4 corresponding to the boom cylinder is maintained at 280 bar. 1 bar is 0.1 MPa, and the details are omitted here.

[0024] As an embodiment of the present utility model, the hydraulic channel includes an oil inlet circuit 6 and an annular oil circuit 7 that are connected to each other; a one-way valve C43 is provided on the oil inlet circuit 6, and the one-way valve C43 here can isolate the oil inlet circuit 6 from the annular oil circuit 7, and the one-way valve C43 is sealed and detachably arranged on the tail link 4; one end of the annular oil circuit 7 is provided with two intermittently separated plugs 13, and the plug 13 is sealed and detachably arranged on the oil inlet link 1 to ensure that the hydraulic oil flows back to the external oil tank.

[0025] Among them, the oil inlets of the excavation link 2 and the support rod link 3 can be equipped with a one-way valve D21 and connected to the oil pump interface 11 and the oil tank interface 42 through the oil inlet line 6, and the oil outlets are connected to the oil tank interface 42 through the annular oil line 7 to prevent the hydraulic oil from flowing back to the oil inlet line 6 and maintain the stability of the hydraulic pressure.

[0026] The hydraulic channel here can also include a loading oil circuit 8 connected to the oil tank interface 42, and the loading oil circuit 8 connects to the middle position of the excavation link 2 and the support rod link 3; the oil inlet link 1 is provided with an HPCO interface 12 connected to the loading oil circuit 8, and the HPCO interface 12 here is connected to other external components and performs high-pressure oil transportation, which will not be described in detail.

[0027] As an embodiment of the present utility model, the valve body also includes a spare link 5 located between the support link 3 and the tail link 4; the spare link 5 is a three-position six-way manual valve; the oil inlet of the spare link 5 is provided with a one-way valve E51 connected to the oil inlet circuit 6, and the oil outlet is connected to the annular oil circuit 7; the loading oil circuit 8 is connected to the middle position of the spare link 5.

[0028] The backup link 5 here can be expanded to control different auxiliary devices to complete excavation auxiliary tasks such as crushing, grabbing, shearing, compacting, etc. The auxiliary devices here include existing breakers, pile drivers, rammers, crushing pliers, heavy hydraulic shears and quick connectors, etc. The details are not repeated here.

[0029] The X interface 41 on the tail link 4 is connected to the clamping cylinder of the existing external clamping tool. The hydraulic oil in the hydraulic channel is reversed through the solenoid valve on the tail link 4, and the flow of hydraulic oil is transmitted through the X interface 41 to control the clamping cylinder, which is convenient for auxiliary transportation of the clamping tool, helps the excavator to expand its uses, and makes the excavation process fast and stable. The details are not repeated here.

[0030] A pressure regulating assembly B52 may be provided between the annular oil circuit 7 and the A and B ports of the backup link 5. The pressure regulating assembly B52 includes an oil replenishment one-way valve B and an overload relief valve B connected in parallel with each other. The pressure regulating assembly B52 has the same function as the pressure regulating assembly A22, and also plays the role of pressure limiting and stabilizing.

[0031] The present invention may be summarized in other specific forms that do not violate the spirit or main features of the present invention. Therefore, no matter from which point of view, the above embodiments of the present invention can only be regarded as an illustration of the present invention and not as a limitation of the present invention. The claims indicate the scope of the present invention, while the above description does not indicate the scope of the present invention. Therefore, any changes within the meaning and scope equivalent to the claims of the present invention should be considered as included within the scope of the claims of the present invention.

Claims

1. A main control valve for an excavation loader, comprising a valve body with a hydraulic passage, characterized in that: The valve body comprises an oil inlet joint (1), an excavation joint (2), a support leg joint (3) and a tail joint (4) which are sealed and connected in series as one; the excavation joint (2) and the support leg joint (3) are three-position six-way manual valves, and the tail joint (4) is provided with a solenoid valve; the number of the excavation joints (2) is four, and the number of the support leg joints (3) is two; The oil inlet link (1) is provided with an oil pump interface (11) communicating with the hydraulic channel; the tail link (4) is also provided with an X interface (41) and an oil tank interface (42) communicating with the hydraulic channel; a pressure regulating assembly A (22) for limiting and stabilizing pressure is provided between the hydraulic channel and the A port and the B port of the excavation link (2), and the pressure regulating assembly A (22) includes an oil replenishment check valve A and an overload relief valve A connected in parallel to each other; The excavation link (2) and the outrigger link (3) both complete the circulation of hydraulic oil through the hydraulic channel; the solenoid valve on the tail link (4) is used to reverse the direction of the hydraulic oil in the hydraulic channel and transmit the flow of the hydraulic oil through the X interface (41).

2. The excavation main control valve for a backhoe loader according to claim 1, characterized in that: The hydraulic channel comprises an oil inlet (6) and an annular oil circuit (7) which are in communication with each other; a one-way valve C (43) is provided on the oil inlet (6) for isolating the oil inlet from the annular oil circuit (7); the one-way valve C (43) is sealingly and detachably arranged on the tail joint (4); two discontinuously separated plugs (13) are provided at one end of the annular oil circuit (7); the plugs (13) are sealingly and detachably arranged on the oil inlet joint (1).

3. The excavation main control valve for an excavator loader according to claim 2, characterized in that: The oil inlets of the excavation joint (2) and the support leg joint (3) are both provided with a one-way valve D (21) and are connected to the oil pump interface (11) and the oil tank interface (42) through the oil inlet path (6), and the oil outlets are both connected to the oil tank interface (42) through the annular oil path (7).

4. The excavation main control valve for an excavator loader according to claim 3, characterized in that: The hydraulic channel further comprises a loading oil circuit (8) communicating with the oil tank interface (42), wherein the loading oil circuit (8) is connected to the middle position of the excavation link (2) and the outrigger link (3); and the oil inlet link (1) is provided with an HPCO interface (12) communicating with the loading oil circuit (8).

5. The excavation main control valve for an excavator loader according to claim 4, characterized in that: The valve body further comprises a spare link (5) located between the leg link (3) and the tail link (4); the spare link (5) is a three-position six-way manual valve; the oil inlet of the spare link (5) is provided with a one-way valve E (51) communicating with the oil inlet circuit (6), and the oil outlet is communicated with the annular oil circuit (7); the loading oil circuit (8) is communicated with the middle position of the spare link (5).

6. The excavation main control valve for an excavator loader according to claim 5, characterized in that: A pressure regulating assembly B (52) for limiting and stabilizing pressure is provided between the annular oil circuit (7) and the A and B ports of the standby link (5). The pressure regulating assembly B (52) includes an oil replenishment check valve B and an overload relief valve B connected in parallel.

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