Hydraulic system applied to small accessory and swing arm deflection of excavator and excavator

Abstract

The invention discloses a hydraulic system applied to an accessory and swing arm deflection of an excavator and the excavator. The hydraulic system comprises a controller, a proportional valve, a main control valve, a reversing valve, a main pump, a swing arm deflection oil cylinder and accessories. The controller is connected with a right input part and a left input part; the proportional valve is electrically connected with the controller, and the proportional valve is electrically connected with the main control valve; the main pump is communicated with the main control valve through an oil way, the main control valve is communicated with the reversing valve through an oil way, and the movable arm deflection oil cylinder and the accessory are both communicated with the reversing valve through an oil way. The controller controls the opening degree of the proportional valve, and the proportional valve controls the opening degree of the main control valve. According to the auxiliary small and movable arm deflection hydraulic system applied to the excavator, the controller and the proportional valve are additionally arranged, the main control valve is controlled through the proportional valve, and the controllability of two actions meeting the customer requirements is achieved in the same valve element state. In addition, the maximum flow of rotation of the accessory can be set through the controller, the maximum rotation speed of rotation of the accessory is adjustable, and different rotation speed requirements of customers are met.

Description

Technical Field

[0001] The invention relates to the technical field of excavators, and in particular to a hydraulic system for swinging an attached boom of an excavator and an excavator. Background Art

[0002] In micro excavation, due to limited space, it is difficult to achieve the independent control of the attachment rotation function by adding a main control valve, so a nine-link main valve is usually used. In addition to the 8 functions of the normal operation of the whole machine, the extra link is used for the auxiliary large flow. When some attachments need rotation and clamping functions, the large flow of a single link can no longer meet the use requirements, and it is necessary to select a main valve based on the existing main control valve to achieve the attachment rotation function.

[0003] In order to realize the attachment rotation function, the boom swing action and attachment rotation are switched, and the switching is realized by the electromagnetic switching valve. In the default state, the electromagnetic switching valve is not energized, and the boom swing function is realized. When the electromagnetic switching valve is energized, its valve core will change direction to realize the attachment rotation function.

[0004] The above hydraulic system realizes the boom swinging action and the attachment rotation action. The boom swinging valve core is not symmetrical, and the flow rate during the left and right deflection is inconsistent. Therefore, when switching to the attachment rotation, the left and right rotation speeds of the attachment will be inconsistent. In addition, in the above hydraulic system, the attachment rotation is controlled by the foot-operated pilot valve. When the attachment action and the whole vehicle action are operated at the same time, there is no coordination and the action is stiff. In addition, when the flow rate of the boom swinging valve core does not meet the attachment rotation flow rate, the valve core needs to be replaced. Summary of the invention

[0005] In order to overcome at least one of the defects of the prior art described above, the present invention provides a hydraulic system for the swing arm and the boom of an excavator, which controls the main control valve by adding a controller and a proportional valve, so as to achieve the controllability of two actions that meet the customer's requirements under the same valve core state. In addition, the maximum flow rate of the rotation of the attachment can be set by the controller, so that the maximum rotation speed of the attachment can be adjusted to meet the different speed requirements of customers.

[0006] In order to overcome at least one of the defects of the prior art described above, the present invention provides an excavator having an excavator attachment and a boom swing hydraulic system, so that the maximum rotation speed of the attachment can be adjusted to meet the different speed requirements of customers.

[0007] The technical solution adopted by the present invention to solve the problem is:

[0008] A hydraulic system for the small and boom tilting of an excavator, comprising a controller, a proportional valve, a main control valve, a reversing valve, a main pump, a boom tilting oil cylinder and accessories;

[0009] The controller is connected to a right input part and a left input part;

[0010] The proportional valve is electrically connected to the controller, and the proportional valve is connected to the main control valve oil circuit;

[0011] The main pump is in communication with the main control valve oil circuit, the main control valve is in communication with the reversing valve oil circuit, and the boom yaw cylinder and the attachments are both in communication with the reversing valve oil circuit;

[0012] The controller controls the opening degree of the proportional valve, and the proportional valve controls the opening degree of the main control valve.

[0013] Further: the reversing valve includes a first oil outlet, a second oil outlet, a third oil outlet and a fourth oil outlet arranged in parallel, the boom yaw oil cylinder is in oil circuit communication with the first oil outlet and the third oil outlet, and the attachment is in oil circuit communication with the second oil outlet and the fourth oil outlet;

[0014] The reversing valve also includes a first oil inlet and a second oil inlet, the first oil outlet and the third oil outlet are respectively connected to the first oil inlet and the second oil inlet at the same time, or the second oil outlet and the fourth oil outlet are respectively connected to the first oil inlet and the second oil inlet at the same time.

[0015] Furthermore: the reversing valve includes a reversing signal input part; the reversing signal input part inputs a signal to control the first oil inlet to be connected with the first oil outlet and the second oil outlet, and also controls the second oil inlet to be connected with the third oil outlet and the fourth oil outlet.

[0016] Furthermore, the proportional valve includes a first pilot valve and a second pilot valve, and the first pilot valve and the second pilot valve respectively control opposite ends of the main valve core of the main control valve.

[0017] Furthermore, the main valve core of the main control valve controls the oil circuit of the main control valve to be connected with the first oil inlet or the second oil inlet.

[0018] Furthermore: the right input part and the left input part are respectively the right-handed part of the handle wheel and the left-handed part of the handle wheel, and the right-handed part of the handle wheel and the left-handed part of the handle wheel are electrically connected to the first pilot valve and the second pilot valve through the controller respectively.

[0019] Furthermore: the boom swing cylinder has a boom swing cylinder large chamber and a boom swing cylinder small chamber, and the boom swing cylinder large chamber and the boom swing cylinder small chamber are respectively connected to the first oil outlet and the third oil outlet oil circuit.

[0020] Furthermore: the attachment is connected to a rotary motor, and the rotary motor is provided with a left rotary liquid inlet and a right rotary liquid inlet, and the left rotary liquid inlet and the right rotary liquid inlet are respectively connected to the second oil outlet and the fourth oil outlet oil circuit.

[0021] Furthermore: the main pump is connected to a main pump hydraulic oil tank.

[0022] An excavator comprises the aforementioned hydraulic system for excavator attachment and boom swing.

[0023] In summary, the hydraulic system for the swing arm and boom of an excavator provided by the present invention has the following technical effects:

[0024] By setting up the controller and proportional valve, the main control valve can be controlled to achieve the purpose of opening the valve core of the main control valve, obtain the required output flow, and achieve the controllability of two actions that meet customer requirements under the same valve core state. In addition, the maximum flow of the attachment rotation can be set through the controller, and the maximum rotation speed of the attachment can be adjusted to meet the different speed requirements of customers.

[0025] In summary, the excavator provided by the present invention has the following technical effects:

[0026] This excavator is equipped with a hydraulic system for the excavator's accessories and boom swing, which allows the excavator to achieve an adjustable maximum rotation speed of the accessories to meet the different speed requirements of customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a schematic diagram of an embodiment of a hydraulic system for the swing arm and boom of an excavator.

[0028] The meanings of the reference numerals are as follows:

[0029] 1. Controller; 2. Proportional valve; 3. Main control valve; 4. Boom swing cylinder; 5. Main pump; 6. Main pump hydraulic oil tank; 7. Reversing valve; 8. Attachments; 11. Right input part; 12. Left input part. DETAILED DESCRIPTION

[0030] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They 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 direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0033] See also Figure 1 The present invention discloses a hydraulic system for an excavator attachment and a boom swing, comprising a controller 1, a proportional valve 2, a main control valve 3, a reversing valve 7, a main pump 5, a boom swing cylinder 4 and an attachment 8.

[0034] The controller 1 is connected to a right input unit 11 and a left input unit 12 .

[0035] The proportional valve 2 is electrically connected to the controller 1 , and the proportional valve 2 is oil-connected to the main control valve 3 .

[0036] The main pump 5 is in oil communication with the main control valve 3 , the main control valve 3 is in oil communication with the reversing valve 7 , and the boom yaw cylinder 4 and the attachment 8 are both in oil communication with the reversing valve 7 .

[0037] The controller 1 controls the opening of the proportional valve 2 , and the proportional valve 2 controls the opening of the main control valve 3 .

[0038] Based on the above scheme, the hydraulic system for the small and movable arm of the excavator is applied and has at least four working states.

[0039] Working state 1: The reversing valve 7 is in working state A1, and the system delivers oil to the boom sway cylinder 4. The operator transmits a control signal to the controller 1 through the right input part 11, and the controller 1 outputs a signal to control the proportional valve 2. The A10 port on the proportional valve 2 outputs the pilot pressure oil to control the valve core of the main control valve 3 to state B1, so that the pressure oil of the main pump 5 enters the boom sway cylinder 4 through the main control valve 3 and the switching valve to achieve the right swing of the boom. The boom sway cylinder 4 has a large chamber of the boom sway cylinder 4 and a small chamber of the boom sway cylinder 4. When the hydraulic oil enters the small chamber of the boom sway cylinder 4, the boom swings to the right. When the hydraulic oil enters the large chamber of the boom sway cylinder 4, the boom swings to the left.

[0040] Working state 2: the reversing valve 7 is still in working state A1, and the system delivers oil to the boom tilt cylinder 4. The operator delivers a control signal to the controller 1 through the left input part 12, and the controller 1 outputs a signal to control the proportional valve 2. The A20 port on the proportional valve 2 outputs the pilot pressure oil to control the valve core of the main control valve 3 to state B2, so that the pressure oil of the main pump 5 enters the large chamber of the boom tilt cylinder 4 through the main control valve 3 and the switching valve, and the boom is tilted to the left.

[0041] Working state three: the reversing valve 7 is in working state A2, and the system delivers oil to the attachment 8. The operator delivers a control signal to the controller 1 through the right input part 11, and the controller 1 outputs a signal to control the proportional valve 2. The A10 port on the proportional valve 2 outputs the pilot pressure oil to control the valve core of the main control valve 3 to state B1, so that the pressure oil of the main pump 5 enters the attachment 8 through the main control valve 3 and the switching valve, and the attachment 8 rotates right.

[0042] Working state 4: the reversing valve 7 is still in working state A2, and the system delivers oil to the attachment 8. The operator delivers a control signal to the controller 1 through the left input part 12, and the controller 1 outputs a signal to control the proportional valve 2. The A20 port on the proportional valve 2 outputs the pilot pressure oil to control the valve core of the main control valve 3 to state B2, so that the pressure oil of the main pump 5 enters the attachment 8 through the main control valve 3 and the switching valve, and the attachment 8 rotates left.

[0043] In the description of the above working state, the difference between the reversing valve 7 being in working state A1 and the reversing valve 7 being in working state A2 is that the reversing valve 7 is in a non-powered state and a powered state. The valve core of the main control valve 3 is in state B1 and the valve core of the main control valve 3 is in state B2, which are two different positions of the valve core of the main control valve 3.

[0044] In the above technical solution, the proportional valve 2 is controlled by the controller 1, and the A10 port and the A20 port on the proportional valve 2 deliver pilot pressure oil to the main control valve 3 to control the valve core position and opening of the main control valve 3. Then the hydraulic oil of the main pump 5 enters the boom swing cylinder 4 or the attachment 8 through the controlled main control valve 3 and the reversing valve 7, so as to achieve the controllability of two actions that meet the customer's requirements under the same valve core state.

[0045] In the above technical solution, in order to solve the problem of "the left and right rotation speeds of the attachment 8 are inconsistent" in the prior art, the maximum flow rate of the rotation of the attachment 8 can be set by the controller 1, and the valve core of the main control valve 3 selects the maximum flow rate required for the boom swing and the rotation of the attachment 8, and keeps the valve core opening area consistent. Assuming that the flow rate Q required for the rotation of the attachment 8 is the largest, the maximum flow rates at both ends of the core are set to Q. At this time, the action speed of the boom swing will become faster. Therefore, a boom swing mode is set in the controller 1, and the flow rate required for the boom swing is set according to the percentage of the flow rate Q. When the right input part 11 or the left input part 12 is manipulated, the input part outputs a voltage signal to the controller 1, and the controller 1 outputs a corresponding current signal according to the maximum flow rate set by the set boom swing mode to control the opening of the proportional solenoid valve, so as to control the pilot oil pressure output by A10\A20 to achieve the purpose of controlling the valve core opening and realize the output of the required flow rate.

[0046] Therefore, in summary, the application of the technical solution of the present invention to the hydraulic system of the excavator's small and boom swing accessories can achieve the controllability of two actions that meet customer requirements under the same valve core state, and can also achieve an adjustable maximum speed of 8 revolutions of the accessories to meet customers' different speed requirements.

[0047] In the present technical solution, the reversing valve 7 includes a first oil outlet, a second oil outlet, a third oil outlet and a fourth oil outlet which are arranged in parallel, the boom swing cylinder 4 is in oil circuit communication with the first oil outlet and the third oil outlet, and the accessory 8 is in oil circuit communication with the second oil outlet and the fourth oil outlet.

[0048] The reversing valve 7 further comprises a first oil inlet and a second oil inlet, and the first oil outlet and the third oil outlet are respectively communicated with the first oil inlet and the second oil inlet at the same time, or the second oil outlet and the fourth oil outlet are respectively communicated with the first oil inlet and the second oil inlet at the same time.

[0049] The reversing valve 7 is an electromagnetic reversing valve 7, which automatically controls the first oil inlet and the second oil inlet to be connected with the first oil outlet and the third oil outlet, or to be connected with the second oil outlet and the fourth oil outlet through electrical signals.

[0050] When the first oil inlet and the second oil inlet are connected to the first oil outlet and the third oil outlet respectively, the hydraulic oil output by the main pump 5 enters the boom tilt cylinder 4 through the reversing valve 7. When the first oil inlet and the second oil inlet are connected to the second oil outlet and the fourth oil outlet respectively, the hydraulic oil output by the main pump 5 enters the attachment 8 through the reversing valve 7, specifically, the rotary motor of the attachment 8 to control the rotation of the attachment 8.

[0051] In the present technical solution, the reversing valve 7 includes a reversing signal input part. The reversing signal input part inputs a signal to control the first oil inlet to communicate with the first oil outlet and the second oil outlet, and also controls the second oil inlet to communicate with the third oil outlet and the fourth oil outlet.

[0052] The reversing signal input part inputs an electrical signal to the reversing valve 7, so that the reversing valve 7 is energized. The reversing valve 7 is in a non-energized or energized state respectively. The reversing valve 7 is in a working state A1 and the reversing valve 7 is in a working state A2, that is, the reversing valve 7 delivers the hydraulic oil delivered by the main pump 5 to the boom swing cylinder 4 and the attachment 8 respectively.

[0053] In the present technical solution, the proportional valve 2 includes a first pilot valve and a second pilot valve, and the first pilot valve and the second pilot valve respectively control the opposite ends of the main valve core of the main control valve 3. The first pilot valve and the second pilot valve control the valve core action of the main control valve 3, control the movement direction of the valve core of the main control valve 3, and further control the valve core opening of the main control valve 3.

[0054] In the present technical solution, the main valve core of the main control valve 3 controls the oil circuit of the main control valve 3 and the first oil inlet or the second oil inlet. The hydraulic oil output by the main pump 5 enters the reversing valve 7 through the main control valve 3, and finally enters the boom tilt cylinder 4 or the attachment 8 through the reversing valve 7. The hydraulic oil output by the main pump 5 controls the different movements of the boom tilt cylinder 4 or the attachment 8 through the first oil inlet or the second oil inlet.

[0055] In the technical solution, the right input part 11 and the left input part 12 are respectively the right-handed part of the handle dial and the left-handed part of the handle dial, which are respectively electrically connected to the first pilot valve and the second pilot valve through the controller 1. Changing the input part to the handle dial makes the operation more coordinated and easier to control.

[0056] In this technical solution, the boom sway cylinder 4 has a large boom sway cylinder 4 chamber and a small boom sway cylinder 4 chamber, and the large boom sway cylinder 4 chamber and the small boom sway cylinder 4 chamber are respectively connected to the first oil outlet and the third oil outlet oil circuit.

[0057] In the present technical solution, the attachment 8 is connected to a rotary motor, and a left rotary liquid inlet and a right rotary liquid inlet are provided on the rotary motor. The left rotary liquid inlet and the right rotary liquid inlet are respectively connected to the second oil outlet and the fourth oil outlet oil circuit.

[0058] In the present technical solution, the main pump 5 is connected to a main pump hydraulic oil tank 6 .

[0059] An excavator includes the aforementioned hydraulic system for excavator attachments and boom swing, so that the excavator can achieve 8-turn maximum rotation speed adjustment of the attachments to meet different speed requirements of customers.

[0060] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A hydraulic system for the swing arm and boom of an excavator, characterized in that: Including controller, proportional valve, main control valve, reversing valve, main pump, boom tilt cylinder and accessories; The controller is connected to a right input part and a left input part; The proportional valve is electrically connected to the controller, and the proportional valve is connected to the main control valve oil circuit; The main pump is in communication with the main control valve oil circuit, the main control valve is in communication with the reversing valve oil circuit, and the boom yaw cylinder and the attachments are both in communication with the reversing valve oil circuit; The controller controls the opening degree of the proportional valve, and the proportional valve controls the opening degree of the main control valve.

2. The hydraulic system for the swing arm and the auxiliary arm of an excavator according to claim 1 is characterized in that: The reversing valve includes a first oil outlet, a second oil outlet, a third oil outlet and a fourth oil outlet arranged in parallel, the boom yaw oil cylinder is in oil communication with the first oil outlet and the third oil outlet, and the attachment is in oil communication with the second oil outlet and the fourth oil outlet; The reversing valve also includes a first oil inlet and a second oil inlet, the first oil outlet and the third oil outlet are respectively connected to the first oil inlet and the second oil inlet at the same time, or the second oil outlet and the fourth oil outlet are respectively connected to the first oil inlet and the second oil inlet at the same time.

3. The hydraulic system for the swing arm and the auxiliary arm of an excavator according to claim 2 is characterized in that: The reversing valve includes a reversing signal input part; the reversing signal input part inputs a signal to control the first oil inlet to be connected with the first oil outlet and the second oil outlet, and also controls the second oil inlet to be connected with the third oil outlet and the fourth oil outlet.

4. The hydraulic system for the swing arm and the auxiliary arm of an excavator according to claim 2 is characterized in that: The proportional valve includes a first pilot valve and a second pilot valve, and the first pilot valve and the second pilot valve respectively control opposite ends of a main valve core of the main control valve.

5. The hydraulic system for the swing arm and the auxiliary arm of an excavator according to claim 4 is characterized in that: The main valve core of the main control valve controls the oil circuit of the main control valve to be connected with the first oil inlet or the second oil inlet.

6. The hydraulic system for the swing arm and the auxiliary arm of an excavator according to claim 4 is characterized in that: The right input part and the left input part are respectively a right-handed handle wheel part and a left-handed handle wheel part, and the right-handed handle wheel part and the left-handed handle wheel part are respectively electrically connected to the first pilot valve and the second pilot valve through the controller.

7. The hydraulic system for the swing arm and boom of an excavator according to claim 2 is characterized in that: The boom tilt cylinder comprises a boom tilt cylinder large chamber and a boom tilt cylinder small chamber, and the boom tilt cylinder large chamber and the boom tilt cylinder small chamber are respectively connected to the first oil outlet and the third oil outlet oil circuit.

8. The hydraulic system for the swing arm and the auxiliary arm of an excavator according to claim 2 is characterized in that: The attachment is connected to a rotary motor, and the rotary motor is provided with a left rotary liquid inlet and a right rotary liquid inlet, and the left rotary liquid inlet and the right rotary liquid inlet are respectively connected to the second oil outlet and the fourth oil outlet oil circuit.

9. The hydraulic system for the excavator's auxiliary gear and boom swing according to claim 1, characterized in that: The main pump is connected to a main pump hydraulic oil tank.

10. An excavator, characterized in that: The invention comprises the hydraulic system for the auxiliary small and boom swing of the excavator as described in claims 1 to 9.

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