Loading control valve for backhoe loader

Abstract

The utility model relates to the technical field of engineering machinery control, in particular to a loading control valve for a backhoe loader, which comprises a valve body, an oil inlet path and an oil return path are arranged in the valve body, and the valve body sequentially comprises an end cover, a rotating bucket valve core, a movable arm valve core, an oil pump valve core A and an oil pump valve core B which are connected in series into a whole in a sealing mode. The rotating bucket valve element is a three-position six-way manual valve, and the movable arm valve element is a four-position six-way manual valve. The oil pump valve element A is provided with an oil pump connector A and an oil tank connector, and the oil pump valve element B is provided with an oil pump connector B; pilot-operated unloading valves communicated between the oil inlet path and the oil return path are arranged in the oil pump valve core A and the oil pump valve core B; oil inlets of the rotating bucket valve core and the movable arm valve core are provided with one-way valves A and are communicated with an oil pump interface A and an oil pump interface B through oil inlet paths, and oil outlets are communicated with an oil tank interface through oil return paths, so that actions of the bucket are accelerated by communicating double pumps, and the working efficiency is improved.

Description

Technical Field

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

[0002] As a multifunctional small-scale engineering machine that integrates the features of traditional excavators and traditional loaders, the backhoe loader can perform shoveling operations in loading mode and excavation operations in excavation mode. For example, a rotary loading backhoe loader disclosed in Chinese CN117536283A includes a control room, a loading device is provided at the front end of the control room, and an excavation device is provided at the rear end. Among them, the loading device is provided with a bucket cylinder and a boom cylinder. The bucket cylinder controls the rotation of the bucket through a mechanical connecting rod, and the boom cylinder controls the lifting and lowering of the bucket through the boom. However, when the control room controls the loading device, the speed of each action of the loading device needs to be accelerated to improve work efficiency.

[0003] Therefore, for the excavator loader, it is urgent to design a control valve for the loading device. Utility Model Content

[0004] The purpose of the present invention is to overcome the defects and shortcomings in the prior art. To this end, the present invention provides a loading control valve for an excavator loader, which can speed up the speed of various bucket movements and improve work efficiency.

[0005] To achieve the above-mentioned object, the utility model provides a loading control valve for an excavator loader, comprising a valve body, wherein an oil inlet and an oil return line are provided in the valve body, wherein the valve body sequentially comprises an end cover, a bucket valve core, an arm valve core, an oil pump valve core A, and an oil pump valve core B, which are sealed and serially connected as one; the bucket valve core is a three-position six-way manual valve, and the arm valve core is a four-position six-way manual valve;

[0006] The oil pump valve core A is provided with an oil pump interface A and an oil tank interface, and the oil pump valve core B is provided with an oil pump interface B; the oil pump valve core A and the oil pump valve core B are both provided with a pilot unloading valve connected between the oil inlet and the oil return;

[0007] The oil inlets of the bucket valve core and the boom valve core are both provided with a one-way valve A and are connected to the oil pump interface A and the oil pump interface B through the oil inlet line, and the oil outlets are both connected to the oil tank interface through the oil return line.

[0008] Furthermore, a high-pressure oil circuit is also provided in the valve body, and the high-pressure oil circuit connects the middle position of the bucket valve core and the boom valve core; the oil pump valve core A and the oil pump valve core B are respectively provided with a throttle port A and a pilot unloading valve connecting the high-pressure oil circuit and the return oil circuit; the oil pump valve core A and the oil pump valve core B are also provided with a throttle port B connecting the oil inlet circuit and the high-pressure oil circuit; the end cover is provided with an HPCO interface connected to the high-pressure oil circuit.

[0009] Furthermore, two overflow oil supply valves A are provided on the bucket valve core; the A port and the B port of the bucket valve core are both connected to the oil return circuit through the corresponding overflow oil supply valves A.

[0010] Furthermore, the boom valve core is provided with a first overflow oil supply valve B, and the A port of the boom valve core is connected to the oil return circuit through the first overflow oil supply valve B.

[0011] Furthermore, the oil inlets of the bucket valve core and the boom valve core are both connected to the oil inlet passage through a one-way valve A.

[0012] Furthermore, the valve body also includes a spare valve core located between the bucket valve core and the boom valve core; the spare valve core is a three-position six-way manual valve; the oil inlet of the spare valve core is provided with a one-way valve B connected to the oil inlet circuit, and the oil outlet is connected to the return oil circuit; the high-pressure oil circuit is connected to the middle position of the spare valve core.

[0013] Furthermore, two prefabricated overflow holes are provided on the spare valve core; the A port and the B port on the spare valve core are connected to the oil return circuit through the corresponding prefabricated overflow holes; the prefabricated overflow holes are used to install the second overflow oil replenishing valve B or a detachable plug.

[0014] Furthermore, the oil pump interface B is provided with a one-way valve C, and the one-way valve C is connected to the oil inlet circuit.

[0015] Compared with the existing technology, the beneficial effects of the present invention are: by manually pushing the movement of the bucket valve core and the boom valve core, the throttle opening of the valve core can be controlled, the movement speed of each oil cylinder can be controlled, and then the movement speed of the bucket can be controlled; by connecting the two pumps through the oil pump interface A and the oil pump interface B and connecting them to the same oil inlet line, the flow can be merged, the speed of each action can be accelerated, and work efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present utility model.

[0017] Figure 2 It is a top view of the utility model.

[0018] Figure 3 for Figure 2Right view of .

[0019] Figure 4 It is the hydraulic principle diagram of the utility model after rotation.

[0020] Among them: 1. End cover; 2. Bucket valve core; 3. Boom valve core; 4. Oil pump valve core A; 5. Oil pump valve core B; 6. Spare valve core; 7. Oil inlet line; 8. Oil return line; 9. High-pressure oil line; 21. Overflow oil supply valve A; 22. One-way valve A; 31. First overflow oil supply valve B; 41. Oil pump interface A; 42. Oil tank interface; 43. Pilot unloading valve; 44. Pilot overflow valve; 51. Oil pump interface B; 52. One-way valve C; 61. One-way valve B; 62. Second overflow oil supply valve B; 63. Plug. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Example

[0023] See also Figures 1 to 4 The utility model provides a loading control valve for an excavator loader, including a valve body, in which an oil inlet line 7 and an oil return line 8 are provided. The valve body sequentially includes an end cover 1, a bucket valve core 2, an arm valve core 3, an oil pump valve core A4 and an oil pump valve core B5 which are sealed and connected in series as one. The bucket valve core 2 is a three-position six-way manual valve, and the arm valve core 3 is a four-position six-way manual valve.

[0024] The oil pump valve core A4 is provided with an oil pump interface A41 and an oil tank interface 42, and the oil pump valve core B5 is provided with an oil pump interface B51; the oil pump valve core A4 and the oil pump valve core B5 are both provided with a pilot unloading valve 43 connected between the oil inlet line 7 and the oil return line 8;

[0025] The oil inlets of the bucket valve core 2 and the boom valve core 3 are both provided with a one-way valve A22 and are connected to the oil pump interface A41 and the oil pump interface B51 through the oil inlet line 7, and the oil outlets are both connected to the oil tank interface 42 through the oil return line 8.

[0026] Manually operating the bucket valve core 2 and boom valve core 3 controls the corresponding trembling and boom movement speeds. Connecting oil pumps P1 and P2 via oil pump ports A41 and B51 funnels the pressurized oil into a single oil inlet 7, converging the flow rates and accelerating each movement, improving work efficiency. Pilot-operated unloading valve 43 provides pressure overload protection, and its details are omitted for clarity.

[0027] The oil pump interface B51 here may be provided with a one-way valve C52, which is connected to the oil inlet line 7 to prevent the hydraulic oil from flowing back and overflowing from the oil pump interface B51.

[0028] As an embodiment of the present utility model, a high-pressure oil circuit 9 is further provided in the valve body, which connects the middle position of the bucket valve core 2 and the boom valve core 3; the oil pump valve core A4 and the oil pump valve core B5 are respectively provided with a throttle port A and a pilot relief valve 44 connected between the high-pressure oil circuit 9 and the return oil circuit 8; the oil pump valve core A4 and the oil pump valve core B5 are also provided with a throttle port B connecting the oil inlet circuit 7 and the high-pressure oil circuit 9; and the end cover 1 is provided with an HPCO interface connected to the high-pressure oil circuit 9.

[0029] When bucket valve spool 2 and boom valve spool 3 are in neutral, hydraulic oil entering through oil pump port A41 and oil pump port B51 flows through throttle port B into high-pressure oil circuit 9. When the oil pressure in high-pressure oil circuit 9 overloads, pilot-operated relief valve 44 within oil pump spool A4 and oil pump spool B5 diverts hydraulic oil from return line 8 through tank port 42 to an external tank. The HPCO port is used to connect external hydraulic components as needed, and its details are omitted here.

[0030] Two overflow oil supply valves A21 can be provided on the bucket valve core 2 here; the A port and B port of the bucket valve core 2 are connected to the return oil line 8 through the corresponding overflow oil supply valve A21 to ensure the normal operation of the bucket cylinder, thereby ensuring the moving speed of the bucket and improving work efficiency.

[0031] The boom valve core 3 here may also be provided with a first overflow oil supply valve B31, and the A port of the boom valve core 3 is connected to the oil return line 8 through the first overflow oil supply valve B31 to ensure the normal operation of the boom cylinder, which will not be described in detail.

[0032] Secondly, the oil inlets of the bucket valve core 2 and the boom valve core 3 can be connected to the oil inlet line 7 through the one-way valve A22 to prevent the hydraulic oil from flowing back and ensure smooth overall operation.

[0033] As an embodiment of the present utility model, the valve body also includes a spare valve core 6 located between the bucket valve core 2 and the boom valve core 3; the spare valve core 6 is a three-position six-way manual valve; the oil inlet of the spare valve core 6 is provided with a one-way valve B61 connected to the oil inlet circuit 7, and the oil outlet is connected to the oil return circuit 8; the high-pressure oil circuit 9 is connected to the middle position of the spare valve core 6.

[0034] The spare valve core 6 here can be provided with two prefabricated overflow holes; the A port and the B port on the spare valve core 6 are connected to the oil return line 8 through the corresponding prefabricated overflow holes; Figure 4 As shown, the prefabricated overflow hole is used to install the second overflow oil supply valve B62 or the detachable plug 63, which can be installed selectively according to needs to connect external hydraulic components for functional expansion, and the details will not be repeated here.

[0035] The utility model adopts a three-in-one six-piece structure as a whole, which is easy to install and maintain and occupies a small space. The flow of the bucket valve core 2 and the boom valve core 3 is controlled by the oil pump valve core A4 and the oil pump valve core B5, thereby accelerating the speed of each action of the bucket, thereby improving work efficiency.

[0036] 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 loading control valve for an excavator loader, comprising a valve body, wherein an oil inlet passage (7) and an oil return passage (8) are provided in the valve body, characterized in that: The valve body comprises an end cover (1), a bucket valve core (2), a boom valve core (3), an oil pump valve core A (4) and an oil pump valve core B (5) which are sealed and connected in series as one; the bucket valve core (2) is a three-position six-way manual valve, and the boom valve core (3) is a four-position six-way manual valve; The oil pump valve core A (4) is provided with an oil pump interface A (41) and an oil tank interface (42), and the oil pump valve core B (5) is provided with an oil pump interface B (51); the oil pump valve core A (4) and the oil pump valve core B (5) are both provided with a pilot unloading valve (43) connected between the oil inlet path (7) and the oil return path (8); The oil inlets of the bucket valve core (2) and the boom valve core (3) are both provided with a one-way valve A (22) and are connected to the oil pump interface A (41) and the oil pump interface B (51) via the oil inlet line (7), and the oil outlets are both connected to the oil tank interface (42) via the oil return line (8).

2. The loading control valve for an excavator loader according to claim 1, characterized in that: A high-pressure oil circuit (9) is further provided in the valve body, and the high-pressure oil circuit (9) is connected to the middle position of the bucket valve core (2) and the boom valve core (3); a throttle port A and a pilot-operated overflow valve (44) are respectively provided in the oil pump valve core A (4) and the oil pump valve core B (5), which are connected between the high-pressure oil circuit (9) and the return oil circuit (8); a throttle port B is further provided in the oil pump valve core A (4) and the oil pump valve core B (5), which is connected to the oil inlet circuit (7) and the high-pressure oil circuit (9); and an HPCO interface communicating with the high-pressure oil circuit (9) is provided on the end cover (1).

3. The loading control valve for an excavator loader according to claim 2, characterized in that: Two overflow oil supply valves A (21) are provided on the rotating bucket valve core (2); the A port and the B port of the rotating bucket valve core (2) are both connected to the oil return path (8) through the corresponding overflow oil supply valves A (21).

4. The loading control valve for an excavator loader according to claim 2, characterized in that: A first overflow oil supply valve B (31) is provided on the boom valve core (3), and a port A of the boom valve core (3) is connected to the oil return path (8) via the first overflow oil supply valve B (31).

5. A loading control valve for an excavator loader according to claim 3 or 4, characterized in that: The oil inlets of the bucket valve core (2) and the boom valve core (3) are both connected to the oil inlet passage (7) via a one-way valve A (22).

6. The loading control valve for an excavator loader according to claim 5, characterized in that: The valve body further comprises a spare valve core (6) located between the bucket valve core (2) and the boom valve core (3); the spare valve core (6) is a three-position six-way manual valve; the oil inlet of the spare valve core (6) is provided with a one-way valve B (61) communicating with the oil inlet circuit (7), and the oil outlet is communicated with the oil return circuit (8); the high-pressure oil circuit (9) is communicated with the middle position of the spare valve core (6).

7. The loading control valve for an excavator loader according to claim 6, characterized in that: The spare valve core (6) is provided with two prefabricated overflow holes; both port A and port B on the spare valve core (6) are connected to the oil return path (8) through the corresponding prefabricated overflow holes; the prefabricated overflow holes are used to install a second overflow oil supply valve B (62) or a detachable plug (63).

8. The loading control valve for an excavator loader according to claim 1, characterized in that: The oil pump interface B (51) is provided with a one-way valve C (52), and the one-way valve C (52) is connected to the oil inlet circuit (7).

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