Excavator bucket confluence hydraulic system and excavator

Abstract

The utility model relates to an excavator bucket confluence hydraulic system and an excavator, and belongs to the technical field of engineering machinery, the excavator bucket confluence hydraulic system comprises a main valve, a linear walking valve and a reversing valve, the oil inlet end of the linear walking valve is communicated with the oil outlet end of the main valve, and the oil outlet end of the linear walking valve is communicated with the oil inlet end of the reversing valve; the oil outlet end of the reversing valve is communicated with a hydraulic oil cylinder for controlling the bucket, the communication mode of the oil channels is changed by adjusting the reversing operation of the linear walking valve, the originally independent oil channels can be reconnected, oil channels which are originally supplied to different hydraulic systems respectively can be reconnected, and therefore the working efficiency is improved. At the moment, hydraulic oil in the second oil supply cavity is converged at the front end of the oil inlet of the reversing valve, then the bidirectional converging function is achieved through reversing of the reversing valve, the flowing path of the hydraulic oil is optimized, therefore, the performance and the response speed of the whole hydraulic system are improved, and then the efficiency that the hydraulic system drives the bucket to work is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of engineering machinery, and particularly relates to a hydraulic system for excavator bucket confluence and an excavator. BACKGROUND

[0002] The statements herein merely provide background technology related to the present disclosure, and do not necessarily constitute prior art.

[0003] Hydraulic excavators are widely used in bridge construction excavation, urban pipeline laying, mine exploitation, and old building demolition, and have the advantages of high mobility, high working efficiency, etc. Most hydraulic excavators use a double-pump confluence system, i.e., the boom and stick valves are confluenced inside, and the bucket adopts a valve external pipe to realize double-pump confluence. In the existing patent No. CN212896585U, the bucket confluence needs to be realized by adding a pipe and a one-way valve outside the main valve to realize the post-valve confluence function. However, this case can only realize the oil confluence in one direction of the bucket hydraulic cylinder rodless cavity, and cannot provide pressure to the hydraulic cylinder rod cavity. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present disclosure is to provide a hydraulic system for excavator bucket confluence and an excavator, which can at least solve one of the above technical problems.

[0005] To achieve the above purpose, one or more embodiments of the present disclosure provide a hydraulic system for excavator bucket confluence, comprising a main valve, a straight travel valve, and a reversing valve. The oil inlet end of the straight travel valve is communicated with the oil outlet end of the main valve. The oil outlet end of the straight travel valve is communicated with the oil inlet end of the reversing valve. The oil outlet end of the reversing valve is communicated with a hydraulic cylinder for controlling the bucket.

[0006] Further, the oil outlet end of the main valve comprises a first oil supply port, a second oil supply port, and a vent port.

[0007] Further, the hydraulic system further comprises a first mid-position cut-off valve and a second mid-position cut-off valve. The first mid-position cut-off valve is a two-position two-way valve. The second mid-position cut-off valve is a two-position two-way valve.

[0008] Further, the valve right position of the first mid-position cut-off valve is a straight-through position, and the valve left position is a cut-off position.

[0009] Further, the valve left position of the second mid-position cut-off valve is a straight-through position, and the valve right position is a cut-off position. The valve left position of the second mid-position cut-off valve is a normal position. When the valve position is reversed, the second oil supply port is cut off from the oil return oil path. The oil in the oil return oil path of the second oil supply port is confluenced in front of the oil inlet port of the reversing valve through the straight travel valve core reversal.

[0010] Further, the oil supply pipeline of the first oil supply port is connected to the oil inlet of the reversing valve through the internal oil pipeline of the main valve.

[0011] Further, the reversing valve is a three-position eight-way valve, and the valve middle position of the reversing valve in a normal state is connected to the rodless chamber of the hydraulic oil cylinder.

[0012] Further, the straight-line travel valve is a two-position four-way valve, and the valve left position of the straight-line travel valve in a normal state is connected to the valve middle position of the reversing valve.

[0013] Further, a one-way valve is arranged on the pipeline connected between the rod chamber of the hydraulic oil cylinder and the exhaust port.

[0014] Another aspect of the embodiment of the present disclosure provides a excavator comprising the excavator bucket converging hydraulic system described above.

[0015] The beneficial effects of one or more technical solutions above are:

[0016] The present disclosure adjusts the reversing operation of the straight-line travel valve, so that the oil passage connection mode changes, the originally independent oil passages are reconnected, the originally separate oil passages for different hydraulic systems are reconnected, the hydraulic oil in the second oil supply port converges at the front end of the oil inlet of the reversing valve, and the bidirectional converging function is realized through the reversing of the reversing valve. The flow path of the hydraulic oil is optimized, the performance and response speed of the entire hydraulic system are improved, and the efficiency of the hydraulic system driving the bucket work is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of this application form a part thereof, serve to further provide a further understanding of the application, and together with the description of the exemplary embodiments of the application, serve to explain the application, and do not constitute a limitation of the application.

[0018] Figure 1 The hydraulic system schematic diagram in one or more embodiments of the present disclosure;

[0019] Figure 2 The reversing valve position switching schematic diagram when the bucket is rapidly excavated in one or more embodiments of the present disclosure;

[0020] Figure 3 The reversing valve position switching schematic diagram when the bucket is rapidly unloaded in one or more embodiments of the present disclosure.

[0021] In the drawings, 1 is a main valve, 2 is a straight-line travel valve, 3 is a reversing valve, 4 is a first middle position cut-off valve, 5 is a second middle position cut-off valve, 6 is a first oil supply port, 7 is a second oil supply port, 8 is an exhaust port, and 9 is a hydraulic oil cylinder. DETAILED DESCRIPTION

[0022] As Figures 1-3This embodiment provides a hydraulic system for the confluence of excavator buckets, including a main valve 1, a linear travel valve 2, and a directional valve 3; the oil outlet of the main valve 1 includes a first oil supply port 6, a second oil supply port 7, and an exhaust port 8; the oil supply line of the first oil supply port 6 is connected to the oil inlet of the directional valve 3 through the internal oil circuit of the main valve 1 and the left position of the linear travel valve 2.

[0023] like Figure 1 As shown, the directional valve 3 is a three-position eight-way valve. Under normal conditions, the valve's neutral position is connected to the rodless chamber of the hydraulic cylinder. The inlet of the linear travel valve 2 is connected to the outlet of the main valve 1, the outlet of the linear travel valve 2 is connected to the inlet of the directional valve 3, and the outlet of the directional valve 3 is connected to the hydraulic cylinder 9 that controls the bucket.

[0024] Specifically, such as Figure 1 As shown, the linear travel valve 2 is a two-position four-way valve. In normal operation, the left position of the linear travel valve 2 is connected to the valve center position of the directional valve 3 and the first oil supply port 6. The second center position shut-off valve 5 is located in the left position, and the second oil supply port 7 is connected to the return oil circuit. At this time, the excavator's bucket is supplied with oil by the first oil supply port 6 through the left or right movement of the directional valve 3, and operates at a normal speed.

[0025] The hydraulic system also includes a second neutral-position shut-off valve 5, which is a two-position two-way valve.

[0026] The left position of the second neutral position shut-off valve 5 is the straight-through position, and the right position is the shut-off position. The left position of the second neutral position shut-off valve 5 is the normal position. When the valve position is reversed, the return oil circuit of the second oil supply port 7 is cut off. Through the reversing of the straight travel valve 2, the oil in the return oil circuit of the second oil supply port 7 is made to merge at the front end of the oil inlet of the reversing valve 3.

[0027] Specifically, when the second neutral shut-off valve 5 switches from the left position to the right position, it cuts off the return oil circuit connected to the second oil supply port 7. During the reversing process, the oil in the return oil circuit of the second oil supply port 7 will not flow to other parts. At the same time, the linear travel valve 2 will perform a reversing action. At this time, the oil in the return oil circuit of the second oil supply port 7 is guided to the front end of the oil inlet of the reversing valve 3, and merges with the oil flowing through the first oil supply port 6, thereby increasing the bucket's operating speed and preventing unnecessary leakage or pressure fluctuations of the oil during the reversing process.

[0028] This embodiment also provides an excavator, including the excavator bucket merging hydraulic system described above.

[0029] The working principle of this utility model is as follows:

[0030] like Figure 2As shown, when the straight travel valve 2 moves right, the reversing valve 3 is switched to the left valve position, at this time, the hydraulic oil converges in front of the reversing valve 3 and flows into the rodless cavity of the hydraulic cylinder 9 to drive the excavator bucket to swing greatly for digging.

[0031] As shown, when the straight travel valve 2 moves right, the reversing valve 3 is switched to the left valve position, at this time, the hydraulic oil converges in front of the reversing valve 3 and flows into the rodless cavity of the hydraulic cylinder 9 to drive the excavator bucket to swing greatly for digging. Figure 3

[0032] Although the specific embodiments of the present disclosure are described above with reference to the drawings, the description is not a limitation on the scope of protection of the present disclosure, and those skilled in the art should understand that various modifications or changes made on the basis of the technical solutions of the present disclosure without creative labor are still within the scope of protection of the present disclosure.​

Claims

1. A hydraulic system for merging the bucket of an excavator, characterized in that, It includes a main valve, a linear travel valve, and a directional valve. The oil inlet of the linear travel valve is connected to the oil outlet of the main valve, the oil outlet of the linear travel valve is connected to the oil inlet of the directional valve, and the oil outlet of the directional valve is connected to the hydraulic cylinder that controls the bucket.

2. The excavator bucket confluence hydraulic system according to claim 1, characterized in that, The main valve's outlet includes a first oil supply port, a second oil supply port, and an exhaust port.

3. The excavator bucket confluence hydraulic system according to claim 1, characterized in that, The hydraulic system also includes a first neutral-position shut-off valve and a second neutral-position shut-off valve. The first neutral-position shut-off valve is a two-position two-way valve, and the second neutral-position shut-off valve is a two-position two-way valve.

4. The excavator bucket confluence hydraulic system according to claim 3, characterized in that, The right position of the first neutral shut-off valve is the through position, and the left position is the shut-off position.

5. The excavator bucket confluence hydraulic system according to claim 3, characterized in that, The second neutral position shut-off valve has a straight-through position on the left and a shut-off position on the right. The second neutral position shut-off valve is in its normal position on the left. When the valve position is reversed, the return oil circuit of the second oil supply port is cut off. The oil in the return oil circuit of the second oil supply port is merged at the front end of the reversing valve inlet by the valve core reversing through the straight-line travel valve core.

6. The excavator bucket confluence hydraulic system according to claim 2, characterized in that, The oil supply line of the first oil supply port is connected to the oil inlet of the reversing valve through the internal oil circuit of the main valve.

7. The excavator bucket confluence hydraulic system according to claim 1, characterized in that, The directional valve is a three-position eight-way valve, and in its normal state, the valve's neutral position is connected to the rodless chamber of the hydraulic cylinder.

8. The excavator bucket confluence hydraulic system according to claim 1, characterized in that, The linear travel valve is a two-position four-way valve, and in its normal state, the left position of the linear travel valve is connected to the middle position of the directional valve.

9. The excavator bucket confluence hydraulic system according to claim 1, characterized in that, A one-way valve is installed on the pipeline connecting the rod chamber and the exhaust port of the hydraulic cylinder.

10. An excavator, characterized in that, The excavator bucket merging hydraulic system includes any one of the claims 1-9 above.

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