CN211665819U - Hydraulic control circuit and excavator - Google Patents

Abstract

The utility model provides a hydraulic control loop and an excavator, which relate to the technical field of engineering machinery and comprise a first oil cylinder for driving a bucket rod to move, a first hydraulic motor for driving a turntable to rotate, a first oil supply component and a second oil supply component; the first oil supply assembly is communicated with the first oil cylinder through a first loop and is used for controlling oil inlet and oil return of the first oil cylinder; the second oil supply assembly is communicated with the first hydraulic motor through a second loop and used for controlling oil inlet and oil return of the first hydraulic motor. Because first oil feed subassembly passes through first return circuit and first hydro-cylinder intercommunication, and the second oil feed subassembly passes through second return circuit and first hydraulic motor intercommunication, so set up for the oil circuit at first hydro-cylinder place and the return circuit at first hydraulic motor place keep apart each other, the fuel feed rate of first hydro-cylinder and the fuel feed rate of first hydraulic motor do not influence each other, and the swing action of dipper and the compound harmony of the gyration action of carousel are good.

Description

Hydraulic control circuit and excavator

technical field

The utility model relates to the technical field of construction machinery, in particular to a hydraulic control circuit and an excavator.

Background technique

An excavator, also known as an excavator, is an excavator that uses a bucket to excavate materials above or below the bearing surface and load it into a transport vehicle or unload it to a stockyard. As shown in Figure 1, the existing excavator mainly includes a carrier wheel, a cockpit, a boom, a stick and a bucket. The travel motor drives the carrier wheel to move, the bucket cylinder drives the bucket to move, and the stick cylinder drives the stick to move. , the boom oil cylinder drives the boom to move; a turntable is arranged between the bearing wheel and the cockpit, and the rotary motor drives the turntable to rotate.

In the excavation work of the excavator, the rotating action of the turntable and the swinging action of the arm are very frequent, and the swinging action of the turntable and the swinging action of the boom are often combined, and the swinging action of the arm and the swinging action of the bucket are also often compound.

In the prior art, the swing motor and the stick cylinder of the excavator are often arranged in the same hydraulic circuit, and the oil supply of the two will affect each other. Slow, the swing action of the stick and the rotation action of the turntable have poor compound coordination, which affects the excavation operation of the excavator.

The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Utility model content

The purpose of the utility model is to provide a hydraulic control circuit and an excavator, so as to alleviate the technical problem of poor composite coordination between the swing action of the excavator arm and the rotation action of the turntable in the prior art.

In order to solve the above-mentioned technical problem, the technical scheme that the utility model provides is:

The hydraulic control circuit provided by the utility model includes a first oil cylinder for driving the arm to move, a first hydraulic motor for driving the turntable to rotate, a first oil supply assembly and a second oil supply assembly;

The first oil supply assembly communicates with the first oil cylinder through a first circuit, and is used to control the oil inlet and oil return of the first oil cylinder; the second oil supply assembly communicates with the first hydraulic motor through a second circuit, Used to control the oil inlet and oil return of the first hydraulic motor.

Further, the first oil supply assembly includes a first hydraulic pump, the first hydraulic pump is communicated with the first oil cylinder through the first circuit, and the first circuit is provided with a circuit for controlling the on-off of the oil circuit. the first control valve.

Further, the second oil supply assembly includes a second hydraulic pump, and the second hydraulic pump is communicated with the first hydraulic motor through the second circuit, and the second circuit is provided with a circuit for controlling the oil passage. disconnected second control valve.

Further, the hydraulic control circuit further includes a second hydraulic motor for driving the excavator to travel, a second oil cylinder for driving the boom to move, a third oil cylinder for driving the bucket to move, and a third oil supply assembly;

The third oil supply assembly is communicated with the second hydraulic motor, the second oil cylinder and the third oil cylinder, respectively.

Further, the third oil supply assembly includes a power pump group and a control valve group;

The power pump group is communicated with the control valve group through a third circuit, and the control valve group is respectively communicated with the second hydraulic motor, the second oil cylinder and the third oil cylinder.

Further, the power pump group includes a third hydraulic pump and a fourth hydraulic pump;

The third circuit includes a first branch and a second branch, the third hydraulic pump communicates with the control valve group through the first branch, and the fourth hydraulic pump passes through the second branch communicated with the control valve group.

Further, the control valve group includes a triple valve, the oil inlet of the triple valve is respectively connected with the third hydraulic pump and the fourth hydraulic pump, and the oil outlet of the triple valve is respectively connected with the third hydraulic pump. Two hydraulic motors, the second oil cylinder and the third oil cylinder are communicated.

Further, the triple valve is provided with a first oil return port and a second oil return port;

The first oil return port is communicated with the second hydraulic motor and the second oil cylinder respectively, and the second oil return port is communicated with the third oil cylinder.

The utility model provides an excavator, comprising a power output device and the hydraulic control circuit;

The power output devices are respectively connected to the first oil supply assembly and the second oil supply assembly in a driving connection.

Further, the PTO includes an engine.

Combined with the above technical solutions, the beneficial effects achieved by the present utility model are:

The hydraulic control circuit provided by the utility model includes a first oil cylinder that drives the arm to move, a first hydraulic motor that drives the turntable to rotate, a first oil supply assembly and a second oil supply assembly; the first oil supply assembly communicates with the first oil supply through the first circuit. The first oil cylinder is communicated for controlling the oil inlet and oil return of the first oil cylinder; the second oil supply assembly is communicated with the first hydraulic motor through the second circuit, and is used for controlling the oil inlet and oil return of the first hydraulic motor.

Since the first oil supply assembly communicates with the first oil cylinder through the first circuit, the first oil supply assembly can control the oil intake and return of the first oil cylinder, and the second oil supply assembly communicates with the first hydraulic motor through the second circuit, The second oil supply assembly can control the oil supply and return of the first hydraulic motor, and is set so that the oil circuit where the first oil cylinder is located and the circuit where the first hydraulic motor is located are isolated from each other, and the oil supply amount of the first oil cylinder and the first hydraulic motor are The oil supply of the excavator does not affect each other, and the swing action of the stick and the rotation action of the turntable have good compound coordination, which is beneficial to improve the stability of the excavator's excavation performance.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. The accompanying drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

1 is a schematic structural diagram of an excavator in the prior art;

FIG. 2 is a schematic structural diagram of a hydraulic control circuit provided by an embodiment of the present invention.

Icon: 100-first oil cylinder; 200-first hydraulic motor; 300-first oil supply assembly; 310-first control valve; 400-second oil supply assembly; 410-second control valve; 500-second hydraulic pressure Motor; 510-second cylinder; 520-third cylinder; 600-power pump group; 601-third hydraulic pump; 602-fourth hydraulic pump; 610-control valve group; 700-power take-off; 800-bucket Cylinder; 810-stick cylinder; 820-boom cylinder; 830-slewing motor; 840-travel motor.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a 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 those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "lower", "External" etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, construction and operation in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third," as they appear, are for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, or a It is a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

As shown in FIG. 1 , the excavator is mainly provided with a bucket cylinder 800 that controls the movement of the bucket, an arm cylinder 810 that controls the movement of the arm, a boom cylinder 820 that controls the movement of the boom, and a swing motor 830 that controls the rotation of the turntable. The travel motor 840 for the excavator travels.

As shown in FIG. 2 , this embodiment provides a hydraulic control circuit, including a first oil cylinder 100 that drives the arm to move, a first hydraulic motor 200 that drives the turntable to rotate, a first oil supply assembly 300 and a second oil supply assembly 400; the first oil supply assembly 300 communicates with the first oil cylinder 100 through the first circuit, and is used to control the oil inlet and oil return of the first oil cylinder 100; the second oil supply assembly 400 communicates with the first hydraulic motor 200 through the second circuit , used to control the oil inlet and oil return of the first hydraulic motor 200 .

Specifically, the first circuit and the second circuit are both configured as hydraulic circuits, the structures of the first oil supply assembly 300 and the second oil supply assembly 400 can be set to be the same, and the first oil supply assembly 300 and the second oil supply assembly 400 are both It can be set to be composed of necessary structures such as a hydraulic pump and a power device that drives the hydraulic pump; the oil inlet and oil return of the first oil cylinder 100 push the piston rod of the oil cylinder to telescopically move in both positive and negative directions, so as to realize the swing of the stick ; The oil inlet and oil return of the first hydraulic motor 200 correspond to the forward and reverse rotation of the first hydraulic motor 200 respectively, so as to drive the turntable to rotate in two directions.

In the hydraulic control circuit provided in this embodiment, since the first oil supply assembly 300 is communicated with the first oil cylinder 100 through the first circuit, the first oil supply assembly 300 can control the oil intake and oil return of the first oil cylinder 100, and the second oil supply assembly 300 can The oil assembly 400 is communicated with the first hydraulic motor 200 through the second circuit, and the second oil supply assembly 400 can control the oil inlet and oil return of the first hydraulic motor 200, so that the oil circuit where the first oil cylinder 100 is located and the first hydraulic pressure The circuits where the motor 200 is located are isolated from each other, the oil supply of the first oil cylinder 100 and the oil supply of the first hydraulic motor 200 do not affect each other, and the swing action of the stick and the rotation action of the turntable have good compound coordination, which is beneficial to improve the excavation operation of the excavator. performance stability.

On the basis of the above embodiment, further, the first oil supply assembly 300 in the hydraulic control circuit provided in this embodiment includes a first hydraulic pump, the first hydraulic pump communicates with the first oil cylinder 100 through the first circuit, and the first hydraulic pump The circuit is provided with a first control valve 310 for controlling the on-off of the oil circuit.

Specifically, the first circuit is configured as a hydraulic circuit composed of hydraulic pipelines, the first hydraulic pump communicates with the first control valve 310 through the hydraulic pipeline, the first control valve 310 also communicates with the first hydraulic cylinder through the hydraulic pipeline, and the first hydraulic pressure The parameters such as the pressure and flow of the pump can be reasonably selected according to the needs of use; the first control valve 310 can be set as a two-position two-way solenoid valve, the first passage of the solenoid valve controls the forward oil intake of the first oil cylinder 100, and the third The two passages control the reverse oil return of the first oil cylinder 100 .

Further, the second oil supply assembly 400 includes a second hydraulic pump, the second hydraulic pump communicates with the first hydraulic motor 200 through a second circuit, and the second circuit is provided with a second control valve 410 for controlling the on-off of the oil circuit.

Specifically, the second circuit is configured as a hydraulic circuit composed of hydraulic pipelines, the second hydraulic pump communicates with the second control valve 410 through the hydraulic pipeline, the second control valve 410 also communicates with the first hydraulic motor 200 through the hydraulic pipeline, and the second hydraulic pump communicates with the second control valve 410 through the hydraulic pipeline. The parameters such as pressure and flow of the hydraulic pump can be reasonably selected according to the needs of use; the second control valve 410 can be set as a two-position two-way solenoid valve, the first passage of the solenoid valve controls the forward oil intake of the first hydraulic motor 200, and the solenoid valve The second channel of the first hydraulic motor 200 controls the reverse oil return of the first hydraulic motor 200 .

In the hydraulic control circuit provided in this embodiment, since the first hydraulic pump independently controls the first oil cylinder 100 through the first control valve 310, and the second hydraulic pump independently controls the first hydraulic motor 200 through the second control valve 410, The oil circuit where the first oil cylinder 100 is located is completely separated from the circuit where the first hydraulic motor 200 is located, the functions of the two do not affect each other, and the structure of the hydraulic circuit is simple, which is convenient for arrangement and implementation.

On the basis of the above embodiment, the hydraulic control circuit provided in this embodiment further includes a second hydraulic motor 500 that drives the excavator to walk, a second oil cylinder 510 that drives the boom to move, and a third oil cylinder that drives the bucket to move. 520 and the third oil supply assembly; the third oil supply assembly communicates with the second hydraulic motor 500, the second oil cylinder 510 and the third oil cylinder 520, respectively.

Specifically, the third oil supply assembly can be configured as a combination of a hydraulic pump and a related control valve, and the third oil supply assembly communicates with the second hydraulic motor 500, the second oil cylinder 510 and the third oil cylinder 520 through hydraulic pipes, respectively, The forward and reverse rotation of the second hydraulic motor 500, the reciprocating movement of the piston rod of the second oil cylinder 510 and the reciprocating movement of the third oil cylinder 520 are correspondingly controlled to finally realize the forward and backward movement of the excavator, the swing of the boom and the swing of the bucket.

Further, the third oil supply assembly includes a power pump group 600 and a control valve group 610; the power pump group 600 is communicated with the control valve group 610 through a third circuit, and the control valve group 610 is respectively connected with the second hydraulic motor 500 and the second oil cylinder 510. It communicates with the third oil cylinder 520 .

Specifically, the power pump group 600 includes at least two hydraulic pumps, the third circuit includes a plurality of hydraulic pipes, the power pump group 600 is communicated with the control valve group 610 through the hydraulic pipes, and the control valve group 610 is also connected to the second hydraulic pressure through the hydraulic pipes, respectively. The motor 500 , the second oil cylinder 510 and the third oil cylinder 520 are in communication, and the control valve group 610 is used to control the oil inlet and oil return of the communication between the second hydraulic motor 500 , the second oil cylinder 510 and the third oil cylinder 520 , respectively.

Further, the power pump group 600 includes a third hydraulic pump 601 and a fourth hydraulic pump 602; the third circuit includes a first branch and a second branch, and the third hydraulic pump 601 communicates with the control valve group 610 through the first branch , the fourth hydraulic pump 602 communicates with the control valve group 610 through the second branch.

Specifically, the types of the third hydraulic pump 601, the fourth hydraulic pump 602, the first hydraulic pump and the second hydraulic pump are set to be the same, preferably, the third hydraulic pump 601, the fourth hydraulic pump 602, the first hydraulic pump and the second hydraulic pump are both set as axial piston variable displacement pumps, the first branch and the second branch are set as hydraulic pipelines, the third hydraulic pump 601 and the fourth hydraulic pump 602 are connected through the hydraulic pipeline and the control valve group. The oil inlet of the 610 is connected.

As an optional implementation of this embodiment, the power pump set 600 includes but is not limited to a third hydraulic pump 601 and a fourth hydraulic pump 602, and also includes a number of fifth hydraulic pumps, and the number of the fifth hydraulic pump can be set to one , two or more, the specific number can be selected according to actual needs.

Further, the control valve group 610 includes a triple valve, the oil inlet of the triple valve is respectively connected with the third hydraulic pump 601 and the fourth hydraulic pump 602, and the oil outlet of the triple valve is respectively connected with the second hydraulic motor 500 and the second oil cylinder 510. It communicates with the third oil cylinder 520 .

Specifically, as a type of integrated hydraulic valve, the triple valve has a compact structure, reliable use, and is widely used in the field of hydraulic control; the triple valve has one total oil inlet and three oil outlets, the third hydraulic pump 601 and the fourth The hydraulic pump 602 is connected with the total oil inlet of the triple valve through the hydraulic pipeline, and the three oil outlets of the triple valve are respectively connected with the second hydraulic motor 500, the second oil cylinder 510 and the third oil cylinder 520; the third hydraulic pump 601 and The oil pumped by the fourth hydraulic pump 602 can enter into the triple valve individually or simultaneously, and the triple valve can be used for one, two, or Three for simultaneous oil supply; that is, the triple valve can control one of the excavator's walking action, the boom's swinging action and the bucket's swinging action individually, or any two actions can be controlled in combination, or Three actions are controlled simultaneously.

Further, the triple valve is provided with a first oil return port and a second oil return port; the first oil return port communicates with the second hydraulic motor 500 and the second oil cylinder 510 respectively, and the second oil return port communicates with the third oil cylinder 520 .

Specifically, the return oil of the second hydraulic motor 500 and the second oil cylinder 510 returns through the first oil return port, the return oil of the third oil cylinder 520 returns through the second oil return port, and the triple valve can return through the first oil return port and the third oil return port. The second oil return port returns oil at the same time, which ensures the oil return speed.

The hydraulic control circuit provided in this embodiment is communicated with the third hydraulic pump 601 and the fourth hydraulic pump 602 respectively through the oil inlet of the triple valve, and the oil outlet of the triple valve is respectively connected with the second hydraulic motor 500, the second oil cylinder 510 and the The third oil cylinder 520 is connected to realize the control of the walking action of the excavator, the swing action of the boom and the swing action of the bucket. The above three actions are not affected by the swing action of the stick and the turning action of the turntable, and the above three actions The combination of this action, the swing action of the stick and the turning action of the turntable is better, which makes the working stability of the excavator better.

On the basis of the above embodiment, further, an excavator provided in this embodiment includes a power output device 700 and a hydraulic control circuit of 400 drive connections.

Specifically, the power output device 700 includes an electric motor and an internal combustion engine. The first hydraulic pump, the second hydraulic pump, the third hydraulic pump 601 and the fourth hydraulic pump 602 are all set as plunger type variable displacement pumps. The power output device 700 passes through the transmission shaft and The cam mechanism is respectively associated with the plunger rod of the first hydraulic pump in the first oil supply assembly 300 and the plunger rod of the second hydraulic pump in the second oil supply assembly 400, the plunger rod of the third hydraulic pump 601 and the fourth The plunger rod of the hydraulic pump 602 is connected.

Further, the PTO 700 includes an engine.

Specifically, the engine can be set as a gasoline engine or a diesel engine, preferably, the engine is set as a diesel engine of an excavator, and the engine drives the first hydraulic pump, the second hydraulic pump, the third hydraulic pump 601 and the fourth hydraulic pump 602, In order to convert mechanical energy into hydraulic energy; since the technical effect of the excavator provided in this embodiment is the same as the technical effect of the hydraulic control circuit provided by the above embodiment, it will not be repeated here.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that : it can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the various embodiments of the present utility model Scope of technical solutions.

Claims (10)

1. A hydraulic control circuit, comprising: the hydraulic control system comprises a first oil cylinder (100) for driving an arm to move, a first hydraulic motor (200) for driving a turntable to rotate, a first oil supply assembly (300) and a second oil supply assembly (400);

the first oil supply assembly (300) is communicated with the first oil cylinder (100) through a first loop and is used for controlling oil inlet and oil return of the first oil cylinder (100); the second oil supply assembly (400) is communicated with the first hydraulic motor (200) through a second loop and used for controlling oil inlet and oil return of the first hydraulic motor (200).

2. The hydraulic control circuit of claim 1, wherein the first oil supply assembly (300) includes a first hydraulic pump that communicates with the first cylinder (100) through the first circuit, and a first control valve (310) for controlling opening and closing of an oil passage is provided on the first circuit.

3. The hydraulic control circuit of claim 1, wherein the second oil supply assembly (400) comprises a second hydraulic pump, the second hydraulic pump is communicated with the first hydraulic motor (200) through a second circuit, and a second control valve (410) for controlling the on-off of an oil path is arranged on the second circuit.

4. The hydraulic control circuit of claim 1, further comprising a second hydraulic motor (500) driving the excavator to travel, a second cylinder (510) driving the boom to move, a third cylinder (520) driving the bucket to move, and a third oil supply assembly;

the third oil supply unit is respectively communicated with the second hydraulic motor (500), the second oil cylinder (510) and the third oil cylinder (520).

5. The hydraulic control circuit of claim 4, wherein the third oil supply assembly includes a power pump stack (600) and a control valve stack (610);

the power pump set (600) is communicated with the control valve set (610) through a third loop, and the control valve set (610) is communicated with the second hydraulic motor (500), the second oil cylinder (510) and the third oil cylinder (520) respectively.

6. The hydraulic control circuit according to claim 5, characterized in that the power pump group (600) comprises a third hydraulic pump (601) and a fourth hydraulic pump (602);

the third circuit comprises a first branch and a second branch, the third hydraulic pump (601) is communicated with the control valve group (610) through the first branch, and the fourth hydraulic pump (602) is communicated with the control valve group (610) through the second branch.

7. The hydraulic control circuit of claim 6, wherein the control valve block (610) comprises a triple valve having an oil inlet in communication with the third hydraulic pump (601) and the fourth hydraulic pump (602), respectively, and an oil outlet in communication with the second hydraulic motor (500), the second cylinder (510), and the third cylinder (520), respectively.

8. The hydraulic control circuit of claim 7, wherein the triple valve is provided with a first oil return port and a second oil return port;

the first oil return port is respectively communicated with the second hydraulic motor (500) and the second oil cylinder (510), and the second oil return port is communicated with the third oil cylinder (520).

9. An excavator, characterized by comprising a power take-off (700) and a hydraulic control circuit according to any one of claims 1-8;

the power output device (700) is in transmission connection with the first oil supply assembly (300) and the second oil supply assembly (400) respectively.

10. The excavator of claim 9 including a power take off (700) comprising an engine.

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