Excavator main pump oil supply accessory priority system and excavator

Abstract

The utility model discloses an excavator main pump oil supply accessory priority system and an excavator, the excavator main pump oil supply accessory priority system comprises a controller, a main valve, a first main pump, a hydraulic motor, a flow distribution valve and a reversing valve, the first main pump supplies hydraulic oil to the main valve and the hydraulic motor, and the hydraulic motor drives an accessory operating device; the controller sends an opening signal to the reversing valve, the reversing valve is opened and supplies hydraulic oil to the hydraulic motor, then the output flow of the first main pump is increased, then the flow distribution valve is controlled by the hydraulic oil pressure fed back by the reversing valve, and the opening degree of a second outlet of the flow distribution valve is adjusted to be large; and hydraulic oil with constant flow is supplied to the hydraulic motor through a first outlet of the reversing valve. According to the excavator main pump oil supply accessory priority system, constant supply of hydraulic pressure on an accessory device is achieved through combination of the flow distribution valve and the reversing valve, and it is guaranteed that the accessory device is in the best working condition.

Description

Technical Field

[0001] This utility model relates to the field of excavator technology, and in particular to an excavator main pump oil supply attachment priority system and an excavator. Background Technology

[0002] Excavators are equipped with different attachments depending on the working conditions, in order to complete other work tasks that cannot be done by conventional buckets, such as screening, gripping, shearing, crushing and so on.

[0003] Attachments installed on excavators are primarily designed for users who require multi-functionality, enabling the use of different attachments under varying working conditions. They also demand convenient operation and reliable performance to meet the increasing demands of customers. However, in existing technologies, the flow of hydraulic fluid from the main pump to the attachments is controlled primarily by the displacement of the auxiliary valve core within the main valve. This method struggles to precisely control the hydraulic pressure on the attachments, making it difficult to ensure reliable operation. In some situations, it can even cause the attachments to malfunction, failing to meet the excavator's operational requirements. Utility Model Content

[0004] In order to overcome at least one of the defects of the prior art, one of the objectives of this utility model is to provide an excavator main pump oil supply attachment priority system, which achieves a constant hydraulic supply to the attachment device through the combination of flow distribution valve and reversing valve, ensuring that the attachment device is in the optimal working condition.

[0005] In order to overcome at least one of the defects described in the prior art, the second objective of this utility model is to provide an excavator having the aforementioned excavator main pump oil supply attachment priority system, which makes the attachment device on the excavator work reliably.

[0006] The technical solution adopted by this utility model to solve its problem is:

[0007] An excavator main pump oil supply attachment priority system includes a controller, a main valve, a first main pump, a hydraulic motor, a flow distribution valve, and a directional valve. The first main pump supplies hydraulic oil to the main valve and the hydraulic motor, and the hydraulic motor drives the attachment control device.

[0008] The outlet of the first main pump is connected to the first inlet of the flow distribution valve, the first outlet of the flow distribution valve is connected to the first outlet of the reversing valve, and the second outlet of the flow distribution valve is connected to the main valve.

[0009] The outlet of the first main pump is also connected to the first inlet of the reversing valve, and the first outlet of the reversing valve supplies hydraulic oil to the hydraulic motor;

[0010] The controller sends an opening signal to the directional valve, which opens and supplies hydraulic oil to the hydraulic motor. Then, the output flow of the first main pump increases. Next, the flow distribution valve is controlled by the hydraulic oil pressure fed back by the directional valve, and the opening of the second outlet of the flow distribution valve is increased. Finally, a constant flow of hydraulic oil is supplied to the hydraulic motor through the first outlet of the directional valve.

[0011] Furthermore: the reversing valve is provided with a first throttling orifice, and the first outlet of the reversing valve is connected to the first throttling orifice;

[0012] After the controller sends an opening signal to the directional valve, when the outlet flow of the first main pump increases, the hydraulic oil pressure at the first outlet of the directional valve decreases, and the hydraulic oil pressure at the first outlet of the directional valve is fed back to the first outlet of the flow distribution valve. When the hydraulic oil pressure at the first outlet of the flow distribution valve decreases, the controller controls the opening degree of the second outlet of the flow distribution valve to increase.

[0013] Furthermore: the flow distribution valve is provided with a second throttling orifice, and the first outlet of the flow distribution valve is connected to the second throttling orifice; the second throttling orifice is connected to the first throttling orifice by the first outlet of the flow distribution valve and the first outlet of the reversing valve, and is controlled in real time by the pressure of the hydraulic oil in the first throttling orifice.

[0014] Furthermore, it also includes an oil tank, the inlet of the first main pump is connected to the oil tank, the first outlet of the reversing valve is connected to the oil tank, and the outlet of the hydraulic motor is connected to the oil tank.

[0015] Furthermore, it also includes a second main pump, the outlet of which is connected to the main valve.

[0016] Further: the main valve includes a first main valve group, a second main valve group, a third main valve group, and a fourth main valve group; the outlet of the first main pump is connected to the first main valve group and the second main valve group, and the second main pump is connected to the third main valve group and the fourth main valve group.

[0017] Furthermore, it also includes a switching valve, wherein the first inlet of the switching valve is connected to the outlet of the first main pump, and the second inlet of the switching valve is connected to the outlet of the second main pump;

[0018] The first outlet of the switching valve is connected to the fourth main valve, and the second outlet of the switching valve is connected to the second main valve.

[0019] Furthermore: the first main valve is connected to at least a first stick mechanism, a second boom mechanism, an auxiliary device and a slewing mechanism; the second main valve is connected to at least a first traveling mechanism; the third main valve is connected to at least a second stick mechanism, a bucket mechanism and a first boom mechanism; and the fourth main valve is connected to at least a second traveling mechanism.

[0020] Furthermore, the switching valve is electrically connected to the controller.

[0021] An excavator including the aforementioned excavator main pump fuel supply attachment priority system.

[0022] In summary, the excavator main pump fuel supply attachment priority system provided by this utility model has the following technical effects:

[0023] 1. By combining a flow distribution valve and a directional valve, a constant hydraulic supply is achieved to the hydraulic motor-driven attachment operating device, ensuring the reliable operation and function of the attachment operating device.

[0024] 2. When the attachment device is not working, the reversing valve is not open, and all the hydraulic pressure output from the first main pump is supplied to the main valve through the flow distribution valve, making hydraulic control simple.

[0025] In summary, the excavator provided by this utility model has the following technical effects: the excavator uses the aforementioned excavator main pump oil supply attachment priority system, which enables the attachment device installed on the excavator to achieve constant pressure operation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of one embodiment of the excavator main pump oil supply attachment priority system of this utility model.

[0027] The meanings of the reference numerals in the attached figures are as follows:

[0028] 1. Main valve; 2. Switching valve; 3. Switch; 4. Controller; 5. Flow distribution valve; 51. Second throttle orifice; 6. Directional valve; 61. First throttle orifice; 7. Hydraulic motor; 8. First main pump; 9. Second main pump; 10. Oil tank. Detailed Implementation

[0029] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0030] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0032] See Figure 1 This utility model discloses a priority system for the main pump oil supply attachment of an excavator.

[0033] An excavator main pump oil supply attachment priority system includes a controller 4, a main valve 1, a first main pump 8, a hydraulic motor 7, a flow distribution valve 5, and a directional valve 6. The first main pump 8 supplies hydraulic oil to the main valve 1 and the hydraulic motor 7, and the hydraulic motor 7 drives the attachment control device.

[0034] The outlet of the first main pump 8 is connected to the first inlet of the flow distribution valve 5, the first outlet of the flow distribution valve 5 is connected to the first outlet of the reversing valve 6, and the second outlet of the flow distribution valve 5 is connected to the main valve 1.

[0035] The outlet of the first main pump 8 is also connected to the first inlet of the reversing valve 6, and the first outlet of the reversing valve 6 supplies hydraulic oil to the hydraulic motor 7.

[0036] The controller 4 sends an opening signal to the directional valve 6, which opens and supplies hydraulic oil to the hydraulic motor 7. Then, the output flow of the first main pump 8 increases. Then, the flow distribution valve 5 is controlled by the hydraulic oil pressure fed back by the directional valve 6 and the opening of the second outlet of the flow distribution valve 5 is increased. Finally, a constant flow of hydraulic oil is supplied to the hydraulic motor 7 through the first outlet of the directional valve 6.

[0037] Based on the above technical solution, when the hydraulic motor 7 and the attachment operating device connected to the hydraulic motor are not working, the controller 4 controls the reversing valve 6 to not work. At this time, the flow distribution valve 5 works, and the hydraulic oil output from the outlet of the first main pump 8 enters the flow distribution valve 5 and then all of it enters the main valve 1, driving the various actuating devices or mechanisms connected to the main valve 1 to work. At this time, all the hydraulic oil output from the outlet of the first main pump 8 enters the main valve 1 through the flow distribution valve 5.

[0038] Based on the above technical solution, when the hydraulic motor 7 and the attachment control device connected to the hydraulic motor are working, the controller 4 controls the reversing valve 6 to start working. The hydraulic oil output from the outlet of the first main pump 8 needs to enter the hydraulic motor 7 through the reversing valve 6, and at the same time, it also needs to enter the main valve 1 through the flow control valve, thereby driving the attachment device and various action devices or mechanisms driven by the main valve 1 to work.

[0039] The specific hydraulic control process at this time is as follows: Controller 4 controls the hydraulic motor 7 to start and simultaneously controls the speed of the hydraulic motor 7 to remain constant. Simultaneously, controller 4 controls the directional valve 6 to open and simultaneously controls the hydraulic oil flow rate output by the first main pump 8 to increase. When the hydraulic oil flow rate output by the first main pump 8 increases, the hydraulic oil flows through the directional valve 6 into the hydraulic motor 7. At this time, the force of the hydraulic oil passing through the directional valve 6 will inevitably increase, so the pressure at the first outlet of the directional valve 6 will decrease. Simultaneously, the directional valve 6 feeds back the hydraulic oil pressure value at its first outlet to the first outlet of the flow distribution valve 5. The decrease in the hydraulic oil pressure value at the first outlet of the flow distribution valve 5 further controls the opening degree of the valve core of the flow distribution valve 5 to increase. This increases the hydraulic oil flow rate distributed by the flow distribution valve 5 to its second outlet, meaning the flow rate of hydraulic oil entering the main valve 1 through the flow distribution valve 5 increases.

[0040] In summary, when the hydraulic motor 7 and the attachment control device connected to the hydraulic motor are working, the controller 4 controls the increase of the hydraulic oil flow rate output by the first main pump 8, controls the constant speed of the hydraulic motor 7 through the controller 4, and controls the opening of the flow distribution valve 5 through the hydraulic oil pressure value fed back by the reversing valve 6, so that the flow distribution valve 5 delivers excess hydraulic oil to the main valve 1, ensuring that the flow rate of hydraulic oil entering the hydraulic motor 7 is constant.

[0041] In other words, simply put, when the flow rate of the first main pump 8 increases, and the flow rate required by the hydraulic motor 7 remains unchanged, the excess flow rate in the first main pump 8 that exceeds the flow rate required by the hydraulic motor 7 will enter the main valve 1 through the flow distribution valve 5. In this process, the flow rate of the hydraulic motor 7 is kept constant first, and then the main valve 1 is provided with sufficient flow rate.

[0042] Conversely, when some of the actuating devices or mechanisms connected to the main valve 1 are not working, the hydraulic oil flow rate output by the first main pump 8 decreases. At this time, the instantaneous flow rate through the directional valve 6 decreases, the first outlet pressure value on the directional valve 6 increases, and this pressure value is fed back to the first outlet of the flow distribution valve 5, controlling the valve core opening of the flow distribution valve 5 to decrease. At this time, the hydraulic oil flow rate entering the main valve 1 through the flow distribution valve 5 decreases, thereby ensuring that the flow rate entering the hydraulic motor 7 through the directional valve 6 can return to the set value, ensuring that the oil supply to the hydraulic motor 7 is constant, and ensuring that the hydraulic motor 7 operates at a constant speed.

[0043] The reason for the statement above, "When the flow rate of hydraulic oil output by the first main pump 8 increases, the hydraulic oil flows through the reversing valve 6 into the hydraulic motor 7. At this time, the force of the hydraulic oil passing through the reversing valve 6 will inevitably increase, so the pressure at the first outlet of the reversing valve 6 will decrease," is that in some systems, orifice plates or limiting ports may be used to control the flow rate. When the inflow flow rate increases, the pressure drop through the orifice plate or limiting port will also increase, resulting in a decrease in the pressure downstream of the orifice plate or limiting port.

[0044] In this technical solution, the reversing valve 6 is provided with a first throttling orifice 61, and the first outlet of the reversing valve 6 is connected to the first throttling orifice 61.

[0045] After the controller 4 sends an opening signal to the directional valve 6, and when the outlet flow of the first main pump 8 increases, the hydraulic oil pressure at the first outlet of the directional valve 6 decreases, and the hydraulic oil pressure at the first outlet of the directional valve 6 is fed back to the first outlet of the flow distribution valve 5. When the hydraulic oil pressure at the first outlet of the flow distribution valve 5 decreases, the controller 4 controls the opening degree of the second outlet of the flow distribution valve 5 to increase.

[0046] By utilizing the throttling principle of the first throttling orifice 61, the directional valve 6 can obtain the pressure value of the hydraulic oil flow through the directional valve 6 and feed the pressure value back to the flow distribution valve 5 to control the opening of the flow distribution valve 5, thereby controlling the flow rate entering the hydraulic motor 7 through the distribution valve.

[0047] In the above scheme, the first outlet of the reversing valve 6, which is connected to the first throttle orifice 61, obtains the pressure value at the position of the first throttle orifice 61 in real time. The first outlet of the reversing valve 6 is connected to the first outlet of the flow distribution valve 5, so that the pressure value at the first outlet of the flow distribution valve 5 changes with the pressure value at the first outlet of the reversing valve 6, thereby realizing real-time control of the opening degree of the flow distribution valve 5.

[0048] When the instantaneous flow rate entering the hydraulic motor 7 through the directional valve 6 decreases, the pressure value at the first outlet of the flow distribution valve 5 increases instantaneously with the pressure value at the first outlet of the directional valve 6. The valve core opening of the flow distribution valve 5 decreases, and the flow rate of hydraulic oil entering the main valve 1 through the second outlet of the flow distribution valve 5 decreases. At this time, part of the hydraulic oil entering the flow distribution valve 5 will flow to the hydraulic motor 7 through the first outlet of the flow distribution valve 5, ensuring that the speed of the hydraulic motor 7 remains constant.

[0049] In this technical solution, a second throttling orifice 51 is provided in the flow distribution valve 5, and the first outlet of the flow distribution valve 5 is connected to the second throttling orifice 51; the second throttling orifice 51 is connected to the first throttling orifice 61 by the first outlet of the flow distribution valve 5 and the first outlet of the reversing valve 6, and is controlled by the pressure of the hydraulic oil in the first throttling orifice 61 in real time.

[0050] In the above scheme, the pressure of the hydraulic oil flowing through the second throttle orifice 51 is changed to obtain the pressure value of the first outlet of the flow distribution valve 5 in real time, thereby realizing reverse control of the flow distribution valve 5, controlling the valve core opening of the flow distribution valve 5, controlling the flow delivered from the second outlet of the flow distribution valve 5 to the main valve 1, realizing constant flow control on the hydraulic motor 7, and enabling the hydraulic motor 7 to work at a constant speed.

[0051] In this technical solution, the excavator main pump oil supply attachment priority system also includes an oil tank 10. The inlet of the first main pump 8 is connected to the oil tank 10, the first outlet of the reversing valve 6 is connected to the oil tank 10, and the outlet of the hydraulic motor 7 is connected to the oil tank 10.

[0052] Oil tank 10 provides oil supply and simultaneously recovers hydraulic oil from hydraulic motor 7.

[0053] In this technical solution, the excavator main pump oil supply attachment priority system also includes a second main pump 9, the outlet of which is connected to the main valve 1. By setting the second main pump 9 alongside the first main pump 8, the first main pump 8 and the second main pump 9 work simultaneously. The second main pump 9 is used to supplement the power limitation of the first main pump 8, ensuring that all actuating devices and mechanisms connected to the main valve 1 can work normally.

[0054] On the excavator, there are many actuators connected to the main valve 1, and some of these actuators have high hydraulic requirements. If only the first main pump 8 is used to supply oil, it is difficult to ensure the normal operation of the actuators connected to the main pump under certain working conditions. Therefore, a second main pump 9 is added here to supplement the first main pump 8, share the pressure of the first main pump 8, and realize the oil supply to some actuators connected to the main valve 1.

[0055] In this technical solution, the main valve 1 includes a first main valve group, a second main valve group, a third main valve group, and a fourth main valve group; the outlet of the first main pump 8 is connected to the first and second main valve groups, and the second main pump 9 is connected to the third and fourth main valve groups. Multiple main valve groups are provided, connecting different actuating devices to different main valve groups to supply hydraulic oil to different actuating devices, facilitating control.

[0056] In this technical solution, the excavator main pump oil supply attachment priority system also includes a switching valve 2. The first inlet of the switching valve 2 is connected to the outlet of the first main pump 8, and the second inlet of the switching valve 2 is connected to the outlet of the second main pump 9.

[0057] The first outlet of switching valve 2 is connected to the fourth main valve 1, and the second outlet of switching valve 2 is connected to the second main valve 1.

[0058] Based on the above technical solution, by switching valve 2, the first main pump 8 and the second main pump 9 supply oil to different main valves 1 respectively. Under normal circumstances, when switching valve 2 is not switching, the first main pump 8 supplies oil to the actuating devices connected to the first and second main valve groups, and the second main pump 9 supplies oil to the third and fourth main valve groups. After switching valve 2 switches, the first main pump 8 supplies oil to the first and third main valve groups, and the second main pump 9 supplies oil to the second and fourth main valve groups.

[0059] In this technical solution, the first main valve is connected to at least the first stick mechanism, the second boom mechanism, auxiliary devices and the slewing mechanism; the second main valve is connected to at least the first traveling mechanism; the third main valve is connected to at least the second stick mechanism, the bucket mechanism and the first boom mechanism; and the fourth main valve is connected to at least the second traveling mechanism.

[0060] In this technical solution, the switching valve 2 is electrically connected to the controller 4. The switching valve 2 is controlled by the controller 4 to achieve automatic switching. A switch 3 is connected to the controller 4, which allows for one-button control of the controller 4's on / off state.

[0061] This technical solution also proposes an excavator, including the aforementioned excavator main pump oil supply attachment priority system. The excavator utilizes the aforementioned excavator main pump oil supply attachment priority system, enabling the attachment devices installed on the excavator to achieve constant pressure operation.

[0062] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A priority system for the main pump oil supply attachment of an excavator, characterized in that: It includes a controller, a main valve, a first main pump, a hydraulic motor, a flow distribution valve, and a directional valve. The first main pump supplies hydraulic oil to the main valve and the hydraulic motor, and the hydraulic motor drives the attachment control device. The outlet of the first main pump is connected to the first inlet of the flow distribution valve, the first outlet of the flow distribution valve is connected to the first outlet of the reversing valve, and the second outlet of the flow distribution valve is connected to the main valve. The outlet of the first main pump is also connected to the first inlet of the reversing valve, and the first outlet of the reversing valve supplies hydraulic oil to the hydraulic motor; The controller sends an opening signal to the directional valve, which opens and supplies hydraulic oil to the hydraulic motor. Then, the output flow of the first main pump increases. Next, the flow distribution valve is controlled by the hydraulic oil pressure fed back by the directional valve, and the opening of the second outlet of the flow distribution valve is increased. Finally, a constant flow of hydraulic oil is supplied to the hydraulic motor through the first outlet of the directional valve.

2. The excavator main pump oil supply priority system according to claim 1, characterized in that: The reversing valve is provided with a first throttling orifice, and the first outlet of the reversing valve is connected to the first throttling orifice. After the controller sends an opening signal to the directional valve, when the outlet flow of the first main pump increases, the hydraulic oil pressure at the first outlet of the directional valve decreases, and the hydraulic oil pressure at the first outlet of the directional valve is fed back to the first outlet of the flow distribution valve. When the hydraulic oil pressure at the first outlet of the flow distribution valve decreases, the controller controls the opening degree of the second outlet of the flow distribution valve to increase.

3. The excavator main pump oil supply attachment priority system according to claim 2, characterized in that: The flow distribution valve is provided with a second throttling orifice, and the first outlet of the flow distribution valve is connected to the second throttling orifice; the second throttling orifice is connected to the first throttling orifice by the first outlet of the flow distribution valve and the first outlet of the reversing valve, and is controlled in real time by the pressure of the hydraulic oil in the first throttling orifice.

4. The excavator main pump oil supply priority system according to claim 1, characterized in that: It also includes an oil tank, the inlet of the first main pump is connected to the oil tank, the first outlet of the reversing valve is connected to the oil tank, and the outlet of the hydraulic motor is connected to the oil tank.

5. The excavator main pump oil supply priority system according to claim 1, characterized in that: It also includes a second main pump, the outlet of which is connected to the main valve.

6. The excavator main pump oil supply attachment priority system according to claim 5, characterized in that: The main valve includes a first main valve group, a second main valve group, a third main valve group, and a fourth main valve group; the outlet of the first main pump is connected to the first main valve group and the second main valve group, and the second main pump is connected to the third main valve group and the fourth main valve group.

7. The excavator main pump oil supply priority system according to claim 6, characterized in that: It also includes a switching valve, wherein the first inlet of the switching valve is connected to the outlet of the first main pump, and the second inlet of the switching valve is connected to the outlet of the second main pump; The first outlet of the switching valve is connected to the fourth main valve, and the second outlet of the switching valve is connected to the second main valve.

8. The excavator main pump oil supply attachment priority system according to claim 6, characterized in that: The first main valve is connected to at least a first stick mechanism, a second boom mechanism, an auxiliary device, and a slewing mechanism; the second main valve is connected to at least a first traveling mechanism; the third main valve is connected to at least a second stick mechanism, a bucket mechanism, and a first boom mechanism; and the fourth main valve is connected to at least a second traveling mechanism.

9. The excavator main pump oil supply attachment priority system according to claim 7, characterized in that: The switching valve is electrically connected to the controller.

10. An excavator, characterized in that, Includes the excavator main pump fuel supply attachment priority system as described in any one of claims 1 to 9.

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