CN218598491U

CN218598491U - Pilot control system, hydraulic control system, and work machine

Info

Publication number: CN218598491U
Application number: CN202223150228.8U
Authority: CN
Inventors: 马朝志
Original assignee: Sany Heavy Machinery Ltd
Current assignee: Sany Heavy Machinery Ltd
Priority date: 2022-11-25
Filing date: 2022-11-25
Publication date: 2023-03-10
Anticipated expiration: 2032-11-25

Abstract

The utility model relates to a hydraulic system technical field provides a guide's control system, hydraulic control system and operation machinery. The pilot control system comprises a pilot pump assembly, an energy accumulator, a pressure detection device and a control device. The pilot pump assembly is connected with the accumulator. The pressure detection device is connected with the energy accumulator and is used for detecting the pressure at the outlet of the energy accumulator. The energy accumulator is connected with a pilot control oil way of the main control system. The control device is electrically connected with the pilot pump assembly and the pressure detection device and is used for controlling the working state of the pilot pump assembly based on the detection result of the pressure detection device. Through the structure, the pilot pump assembly fills oil for the energy accumulator, the real-time pressure value of the energy accumulator is detected through the pressure detection device, and the working state of the pilot pump assembly is controlled by the control device based on the detection result of the pressure detection device. Therefore, energy waste caused by continuous work of the pilot pump assembly can be greatly reduced, and heat generated by overflow of the pilot pump assembly is reduced.

Description

Pilot control system, hydraulic control system, and work machine

Technical Field

The utility model relates to a hydraulic system technical field especially relates to a guide's control system, hydraulic control system and operation machinery.

Background

In a work machine such as an excavator, a hydraulic control system is generally used as a power system to drive the work machine for traveling and construction work. Hydraulic control systems typically include a main system for adjusting the operating state of the implement and a pilot control system that provides pilot control pressure to the main system. In the prior art, when a main system does not need pilot control pressure, a pilot pump is still in a continuous output state, and pressure oil output by the pilot pump overflows through an overflow valve and flows back into an oil tank, so that a large amount of heat is generated and energy waste is increased.

SUMMERY OF THE UTILITY MODEL

The utility model provides a pilot control system, hydraulic control system and operation machinery for solve or improve the great and extravagant problem of energy that just exists of the produced heat of current pilot control system at operation in-process pilot pump overflow.

According to a first aspect of the present invention, there is provided a pilot control system, comprising: the pilot pump assembly, energy storage ware, pressure detection device and controlling means.

The pilot pump assembly is connected with the accumulator. The pressure detection device is connected with the energy accumulator and is used for detecting the pressure at the outlet of the energy accumulator. And the energy accumulator is connected with a pilot control oil way of the main control system. The control device is electrically connected with the pilot pump assembly and the pressure detection device and is used for controlling the working state of the pilot pump assembly based on the detection result of the pressure detection device.

According to the utility model provides a pair of guide's control system, guide's pump package spare includes guide's pump and motor. The motor is connected with the pilot pump. The control device is connected with the motor and used for controlling the working state of the motor based on the detection result of the pressure detection device.

According to the utility model provides a pair of pilot control system, pilot control system still includes the pilot intercommunication device, the energy storage ware passes through the pilot intercommunication device with the pilot control oil circuit is connected. The pilot communication device is used for controlling the communication state of the energy accumulator and the pilot control oil way.

According to the utility model provides a pair of guide's control system, guide's intercommunication device is including guide's intercommunication switching-over valve. The pilot communication reversing valve comprises a communication position and a stop position.

In the state of the communication position, the accumulator is communicated with the pilot control oil way; and in the state of the stopping position, the energy accumulator is stopped from the pilot control oil way.

According to the utility model provides a pair of guide's control system, controlling means with guide's intercommunication switching-over valve is connected. The control device is used for controlling the switching of the working position of the pilot communication reversing valve.

According to the utility model provides a pair of guide's control system, the guide's pump with be provided with the backflow prevention check valve between the energy storage ware.

According to the pilot control system provided by the utility model, when the real-time pressure value of the energy accumulator is lower than the target pressure value set in the control device, the control device controls the pilot pump assembly to start; and when the real-time pressure value of the accumulator is greater than or equal to the target pressure value set in the control device, the control device controls the pilot pump assembly to close.

According to a second aspect of the present invention, there is provided a hydraulic control system, comprising a main control system and a pilot control system as described above.

Wherein the master control system comprises a master control valve. And the pilot control oil port of the main control valve is connected with the energy accumulator through the pilot control oil way.

According to the utility model provides a pair of hydraulic control system, main control system still includes main pump and final controlling element. The main pump is connected with the execution device through the main control valve.

According to a third aspect of the present invention, there is provided a work machine comprising a pilot control system or a hydraulic control system as described above.

The utility model provides an among the pilot control system, the pilot pump subassembly is connected with the energy storage ware to fill liquid for the energy storage ware by the pilot pump subassembly. The energy accumulator is connected with the pilot control oil way of the main control system, and the energy accumulator supplies oil for the pilot control oil way of the main control system. The pressure detection device is connected with the energy accumulator and used for detecting the real-time pressure value of the energy accumulator. The control device is electrically connected with the pressure detection device and the pilot pump assembly. The pressure detection device can transmit the real-time pressure value of the energy accumulator detected by the pressure detection device to the control device, and the control device can control the working state of the pilot pump assembly based on the real-time pressure value.

When the real-time pressure value of the energy accumulator is lower than the set target pressure value in the control device, the control device controls the pilot pump assembly to be opened, so that the pilot pump assembly charges the energy accumulator, and the oil supply requirement of a pilot control oil path of the main control system is further guaranteed. And when the real-time pressure value of the accumulator is greater than or equal to the target pressure value set in the control device, the control device controls the pilot pump assembly to close.

Through the structure, the pilot pump assembly fills oil for the energy accumulator, the real-time pressure value of the energy accumulator is detected through the pressure detection device, and the working state of the pilot pump assembly is controlled by the control device based on the detection result of the pressure detection device. Therefore, energy waste caused by continuous work of the pilot pump assembly can be greatly reduced, and heat generated by overflow of the pilot pump assembly is reduced.

Further, the present invention provides a hydraulic control system and a working machine, both of which include the pilot control system as described above, and therefore, both of which also have the advantages as described above.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a system schematic diagram of a hydraulic control system provided by the present invention;

reference numerals are as follows:

100. a pilot pump assembly; 101. a pilot pump; 102. a motor; 200. an accumulator; 300. a pressure detection device; 400. a control device; 500. a pilot communication device; 501. a pilot control oil path; 600. a backflow prevention check valve; 700. a main pump; 800. a master control valve; 900. and an execution device.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, a first feature may be "on" or "under" a second feature such that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may mean that the first feature is directly above or obliquely above the second feature, or that only the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, without mutual contradiction, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification to make the objects, technical solutions, and advantages of the embodiments of the present invention clearer, and the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

A pilot control system, a hydraulic control system, and a working machine according to an embodiment of the present invention will be described with reference to fig. 1. It should be understood that the following description is only exemplary of the present invention and does not constitute any particular limitation of the present invention.

An embodiment of the first aspect of the present invention provides a pilot control system, as shown in fig. 1, the pilot control system includes: a pilot pump assembly 100, an accumulator 200, a pressure detection device 300, and a control device 400.

The pilot pump assembly 100 is connected to an accumulator 200. The pressure detecting means 300 is connected to the accumulator 200 and serves to detect the pressure at the outlet of the accumulator 300. The accumulator 200 is connected to a pilot control oil passage 501 of the main control system. The control device 400 is electrically connected to the pilot pump assembly 100 and the pressure detection device 300, and is used to control the operating state of the pilot pump assembly 100 based on the detection result of the pressure detection device 300.

In the pilot control system provided by the present invention, the pilot pump assembly 100 is connected to the accumulator 200 to charge the accumulator 200 with the pilot pump assembly 100. The accumulator 200 is connected to a pilot control oil passage 501 of the main control system, and the accumulator 200 supplies oil to the pilot control oil passage 501 of the main control system. The pressure detecting device 300 is connected to the accumulator 200 for detecting a real-time pressure value of the accumulator 200. The control device 400 is connected to the pressure detection device 300 and the pilot pump assembly 100. The pressure detection device 300 can transmit the real-time pressure value of the accumulator 200 detected by the pressure detection device into the control device 400, and the control device 400 can control the working state of the pilot pump assembly 100 based on the real-time pressure value.

For example, in one embodiment of the present invention, when the real-time pressure value of the accumulator 200 is lower than the target pressure value set in the control device 400, the control device 400 controls the pilot pump assembly 100 to start; when the real-time pressure value of the accumulator 200 is greater than or equal to the target pressure value set in the control device 400, the control device 400 controls the pilot pump assembly 100 to close.

Therefore, when the real-time pressure value of the accumulator 200 is lower than the target pressure value set in the control device 400, the control device 400 controls the pilot pump assembly 100 to be opened, so that the pilot pump assembly 100 fills the accumulator 200, and the oil supply requirement of the pilot control oil path 501 of the main control system is further ensured. When the real-time pressure value of the accumulator 200 is greater than or equal to the target pressure value set in the control device 400, the control device 400 controls the pilot pump assembly 100 to close, so as to reduce energy waste.

With this configuration, the pilot pump assembly 100 fills the accumulator 200 with oil, the real-time pressure value of the accumulator 200 is detected by the pressure detection device 300, and the control device 400 controls the operating state of the pilot pump assembly 100 based on the detection result of the pressure detection device 300. Thus, it is possible to greatly reduce energy waste due to continuous operation of the pilot pump assembly 100 and to reduce heat generated due to flooding of the pilot pump assembly 100.

In one embodiment of the present invention, the pilot pump assembly 100 includes a pilot pump 101 and a motor 102. The motor 102 is connected to the pilot pump 101. The control device 400 is connected to the motor 102. The control means 400 is for controlling the operating state of the motor 102 based on the detection result of the pressure detecting means 300.

For example, a maximum target pressure value and a minimum target pressure value are preset in the control device 400. During operation, the pressure detection device 300 is capable of detecting a real-time pressure value of the accumulator 200. When the real-time pressure value of the accumulator 200 is lower than the minimum target pressure value, the control device 400 controls the motor 102 to be started and drives the pilot pump 101 to operate, so that the pilot pump 101 sucks the oil from the oil tank and supplies the oil to the accumulator 200. When the real-time pressure value of the accumulator 200 is greater than or equal to the maximum target pressure value, the control device 400 controls the motor 102 to be turned off, so that the pilot pump 101 stops operating, and the pilot pump 101 stops charging the accumulator 200.

As can be seen from the above description, the control device 400 controls the motor 102 to operate and drives the pilot pump 101 to start only when the accumulator 200 needs to be replenished with oil. When the oil supply pressure of the accumulator 200 can satisfy the operation demand, the motor 102 and the pilot pump 101 are both in a stopped state. This reduces energy waste and spill loss caused by the pilot pump 101 continuously operating in an unnecessary state.

It should be noted here that the present invention is not limited in any way to the specific type of the pressure detection device 300. For example, in one embodiment of the present invention, the pressure detection device 300 includes a pressure sensor.

In an embodiment of the present invention, the pilot control system further includes a pilot communication device 500. The accumulator 200 is connected to a pilot control oil passage 501 through a pilot communication device 500. The pilot communication device 500 is used to control the communication state between the accumulator 200 and the pilot control oil passage 501.

More specifically, in one embodiment of the present invention, the pilot communication device 500 includes a pilot communication directional valve. The pilot communication reversing valve comprises a communication position and a stop position.

In the state of the communication position, the accumulator 200 is communicated with the pilot control oil passage 501; in the stop position, the accumulator 200 is stopped from the pilot oil passage 501.

For example, when the accumulator 200 is required to supply the pilot control oil passage 501 of the main control system, the pilot communication selector valve is switched to the communication position so that the accumulator 200 communicates with the pilot control oil passage 501. Still further, the main control valve 800 in the main control system includes a left control port and a right control port. The communication position of the pilot communication reversing valve comprises a left control position and a right control position. When the main control valve 800 needs to be switched to the left position, the pilot communication directional control valve is switched to the left control position, so that the accumulator 200 is communicated with the left control oil port of the main control valve 800, and the main control valve 800 is driven to be switched to the left position. Or, when the main control valve 800 needs to be switched to the right position, the pilot communication directional control valve is switched to the right control position, so that the accumulator 200 is communicated with the right control oil port of the main control valve 800, and the main control valve 800 is driven to be switched to the right position. Or, when the main control valve 800 needs to maintain the neutral position, the pilot communication directional control valve is switched to the stop position, at this time, the accumulator 200 and the left and right control oil ports of the main control valve 800 are both stopped, and the main control valve 800 can be maintained in the neutral position.

In another embodiment of the present invention, the control device 400 is connected to the pilot communication directional valve. The control device 400 controls switching of the operation position of the switching pilot communication selector valve. The operating position of the pilot communication directional valve may be adjusted by the control device 400. Further, control buttons for controlling the control device 400 may be arranged on the work machine cab table. For example, the control buttons include a button for directly switching the operation position of the pilot communication directional valve. Furthermore, the control device 400 may be provided with a remote control. The operating state of the pilot communication reversing valve can be remotely controlled by an operator through a remote controller. Therefore, an operator can flexibly select an operation mode under different scenes or working conditions, and if the operator works normally, the operator can select to perform corresponding operation on a workbench of a cab; alternatively, during maintenance, the operator can choose to perform corresponding operations from a remote control outside the cab so as to observe the operating state of the pilot control system.

It should be noted that, in the embodiment of the present invention, the control device 400 may be a conventional hardware control device 400 such as a single chip or a PLC. In other words, the control means of the present invention can be implemented by only a hardware device or a hardware circuit without the aid of a software program

In an embodiment of the present invention, a backflow prevention check valve 600 is disposed between the pilot pump 101 and the accumulator 200. The backflow prevention check valve 600 can prevent the hydraulic oil on the outlet side from flowing backward into the pilot pump 101 to damage the pilot pump 101. This effectively protects the pilot pump 101 and prolongs the service life of the pilot pump 101.

An embodiment of the second aspect of the present invention provides a hydraulic control system, as shown in fig. 1, including a main control system and a pilot control system as described above.

Wherein the master control system includes a master control valve 800. The pilot oil port of the main control valve 800 is connected to the accumulator 200 through a pilot oil passage 501.

Further, in an embodiment of the present invention, the main control system further includes a main pump 700 and an executing device 900. The main pump 700 is connected to the actuator 900 through the main control valve 800.

For example, in an embodiment of the present invention, an oil inlet of the main pump 700 is connected to the oil tank, an oil outlet of the main pump 700 is connected to an oil inlet of the main control valve 800, and an oil return port of the main control valve 800 is connected to the oil tank. The oil outlet of the main control valve 800 is connected with the execution device 900. The main control valve 800 is used to control the operation state of the actuator 900. For example, the main control valve 800 is a directional valve. When the actuator 900 is a hydraulic motor, the steering of the hydraulic motor can be adjusted by controlling the operating position of the main control valve 800. When the actuator 900 is a hydraulic cylinder, the extension state of the piston rod of the hydraulic cylinder can be adjusted by controlling the operating position of the main control valve 800. For another example, the main control valve 800 is a proportional directional valve, and the rotation speed of the hydraulic motor or the operation speed of the piston rod of the hydraulic cylinder can be controlled by adjusting the opening degree of the oil port communication of the main control valve 800.

An embodiment of the third aspect of the present invention provides a working machine, including a hydraulic control system as described above.

For example, the work machine includes an excavator. When the work machine is an excavator, the actuator 900 may include a travel motor, a swing motor, a boom cylinder, an arm cylinder, a bucket cylinder, and the like. Accordingly, the traveling motor, the swing motor, the boom cylinder, the arm cylinder, and the bucket cylinder are driven to operate by the main pump 700, and the excavator travels, the swing platform swings, and the boom, the arm, the bucket, and the like operate accordingly.

It should be understood that the above-described embodiment is only an exemplary embodiment of the present invention, and should not constitute any limitation to the present invention. That is, the work machine includes, but is not limited to, an excavator. For example, in other embodiments of the present invention, the working machine may further include a crane, a loading vehicle, a heading machine, or the like.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A pilot control system is characterized by comprising a pilot pump assembly, an energy accumulator, a pressure detection device and a control device,

the pilot pump assembly is connected with the energy accumulator, the pressure detection device is connected with the energy accumulator and used for detecting the pressure at the outlet of the energy accumulator, the energy accumulator is connected with a pilot control oil way of the main control system, and the control device is electrically connected with the pilot pump assembly and the pressure detection device and used for controlling the working state of the pilot pump assembly based on the detection result of the pressure detection device.

2. The pilot control system according to claim 1, wherein the pilot pump assembly includes a pilot pump and an electric motor connected to the pilot pump, and the control device is connected to the electric motor for controlling an operating state of the electric motor based on a detection result of the pressure detecting device.

3. The pilot control system according to claim 1, further comprising a pilot communication device through which the accumulator is connected to the pilot control oil passage, the pilot communication device being configured to control a communication state of the accumulator with the pilot control oil passage.

4. The pilot control system of claim 3, wherein the pilot communication device comprises a pilot communication directional-change valve comprising a communication position and a cut-off position,

5. The pilot control system according to claim 4, wherein the control device is connected to the pilot communication-switching valve, and the control device is configured to control switching of an operation position of the pilot communication-switching valve.

6. The pilot control system of claim 2 wherein a back-flow prevention check valve is provided between the pilot pump and the accumulator.

7. The pilot control system of claim 1, wherein the control device controls the pilot pump assembly to start when a real-time pressure value of the accumulator is lower than a target pressure value set in the control device; and when the real-time pressure value of the accumulator is greater than or equal to the target pressure value set in the control device, the control device controls the pilot pump assembly to close.

8. Hydraulic control system, characterized in that it comprises a main control system and a pilot control system according to any of claims 1-7,

the main control system comprises a main control valve, and a pilot control oil port of the main control valve is connected with the energy accumulator through the pilot control oil way.

9. The hydraulic control system of claim 8, wherein the main control system further comprises a main pump and an implement, the main pump being connected to the implement through the main control valve.

10. A work machine comprising a pilot control system according to any one of claims 1-7 or comprising a hydraulic control system according to claim 8 or 9.