Accessory flow control system and engineering machinery
By designing a genus flow control system that contains flow adjustment solenoid valve sets and instruments, the problem of incomplete flow adjustment in the existing technology has been solved, and the accurate adjustment and automatic gear of the maximum input traffic of construction machinery are realized. Bitter judgment.
Patent Information
- Application Number
- CN202421123482.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-22
AI Technical Summary
The existing engineering machinery equipment flow control system is difficult to achieve accurate adjustment, and it is impossible to automatically determine whether the current engine gear meets the manually set flow rate.
Design a type of flow control system, including hydraulic pumps, underwriting hydraulic execution parts, control valves, control devices and flow adjustment devices. The flow adjustment device consists of the flow adjustment solenoidal valve group and instrument group. The maximum traffic target value is input through the instrument. The electronic control controls the maximum traffic of the electromotor group in the electrical control flow, and the accurate flow adjustment is achieved.
The accurate adjustment of the maximum input traffic of construction machinery is achieved, which is convenient and accurately regulate the traffic, and can automatically determine whether the engine gear meets whether the flow needs are met.
Smart Images
Figure CN222415455U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a hydraulic control system, more specifically, to an attachment flow control system and engineering machinery. Background Art
[0002] The accessories in the working device of construction machinery are usually driven by hydraulic actuators. Construction machinery needs to replace corresponding accessories to complete different tasks. Various accessories have their own maximum working flow rate, and the maximum output flow rate that the hydraulic pump equipped on the construction machinery can provide can often be adapted to various accessories. For some accessories, the maximum output flow rate of the hydraulic pump is much larger than the maximum flow rate of the accessory. At this time, it is necessary to adjust the hydraulic flow supplied to the accessories to make the two compatible.
[0003] In existing flow control systems for construction machinery accessories, a flow regulating valve for manually adjusting the flow is usually arranged in front of the accessory control valve. The flow regulation accuracy of this accessory flow control system is not high, and it is difficult to achieve an ideal output flow. At the same time, it is also impossible to automatically determine whether the current engine gear meets the manually set flow. Utility Model Content
[0004] The technical problem to be solved by the utility model is the problem of adjusting the maximum flow input of engineering machinery accessories, and provides an accessory flow control system and engineering machinery, so as to accurately adjust the maximum input flow of engineering machinery accessories.
[0005] The technical solution of the utility model to achieve its purpose is as follows: construct an attachment flow control system, including a hydraulic pump, an attachment hydraulic actuator, a control main valve for controlling the attachment hydraulic actuator, a control device for controlling the switching of the control main valve, and a flow regulating device, wherein the flow regulating device includes:
[0006] A flow regulating solenoid valve group, connected between the control main valve and the hydraulic pump, for regulating the maximum flow to the oil inlet of the control main valve;
[0007] The instrument is electrically connected to the flow regulating solenoid valve group and is used for inputting a flow regulating signal and outputting a flow control current corresponding to the flow regulating signal to the flow regulating solenoid valve group.
[0008] In the flow control system of the utility model, the instrument comprises an instrument controller which outputs flow control current to the flow regulating electromagnetic valve group, and an input and display module which is electrically connected to the instrument controller.
[0009] In the accessory flow control system of the utility model, the input and display module is composed of a touch-type display or a display and an adjusting knob.
[0010] In the attachment flow control system of the utility model, the hydraulic pump is a gear pump, the gear control device of the engine driving the hydraulic pump is electrically connected to the instrument controller, and the instrument controller displays the flow range corresponding to the engine working gear on the input and display module according to the setting.
[0011] In the attachment flow control system of the utility model, the gear control device is composed of an engine control unit or an engine gear knob.
[0012] In the flow control system of the utility model, the flow regulating solenoid valve group includes a regulating solenoid valve and a pressure compensating valve;
[0013] The electromagnet of the regulating solenoid valve is electrically connected to the instrument, the oil inlet and outlet ports of the regulating solenoid valve are correspondingly connected to the hydraulic pump and the control main valve, and the regulating solenoid valve can adjust the valve opening between the oil inlet and outlet ports according to the flow control current;
[0014] The oil inlet and outlet ports of the pressure compensating valve are connected to the oil inlet port of the regulating solenoid valve and the hydraulic oil tank correspondingly, the spring chamber of the pressure compensating valve is connected to the oil outlet port of the regulating solenoid valve, and the control chamber of the pressure compensating valve is connected to the oil inlet port of the regulating solenoid valve. The pressure of the spring chamber and the control chamber of the pressure compensating valve acts on both ends of the valve core to adjust the valve opening between the oil inlet and outlet ports of the pressure compensating valve, thereby ensuring that the pressure difference between the oil inlet and outlet ports of the regulating solenoid valve is constant, so that the flow rate flowing through the regulating solenoid valve is only related to the opening of the regulating solenoid valve.
[0015] In the accessory flow control system of the utility model, the pressure compensating valve is a four-way valve, a first oil inlet of which is connected to the oil inlet of the regulating solenoid valve, a first oil outlet is connected to the hydraulic oil tank, and the oil outlet of the regulating solenoid valve is connected to the control main valve via the second oil inlet and the second oil outlet of the pressure compensating valve, and the change in the valve opening between the first oil inlet and the oil outlet is opposite to the change in the valve opening between the second oil inlet and the oil outlet.
[0016] In the accessory flow control system of the utility model, the control device comprises a controller and an electric control handle electrically connected to the controller; the control main valve is an electromagnetic valve whose electromagnet is electrically connected to the controller.
[0017] In the accessory flow control system of the utility model, the control device includes a controller, an electric control handle electrically connected to the controller, and an electric proportional pilot valve electrically connected to the controller. The pilot oil port of the electric proportional pilot valve is connected to the hydraulic control end of the control main valve, and the oil inlet is connected to the pilot pressure oil source.
[0018] The technical solution for achieving the purpose of the utility model is as follows: constructing an engineering machine having the aforementioned attachment flow control system, and the engineering machine may be an excavator, a loader, etc.
[0019] Compared with the prior art, the utility model inputs the target value of the maximum flow rate through an instrument and adjusts the maximum flow rate of the electromagnetic valve group through electronic control, and the flow rate adjustment is convenient and accurate. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a principle diagram of a flow control system of the utility model.
[0021] Parts names and serial numbers in the figure:
[0022] Hydraulic pump 1, flow regulating solenoid valve group 2, regulating solenoid valve 21, pressure compensating valve 22, hydraulic oil tank 3, electric control handle 4, controller 5, electric proportional pilot valve 6, safety valve 7, first oil replenishment overflow valve 8, second oil replenishment overflow valve 9, control main valve 10, accessory hydraulic actuator 11, instrument controller 12, input and display module 13, gear control device 14. DETAILED DESCRIPTION
[0023] The specific implementation scheme is described below with reference to the accompanying drawings.
[0024] like Figure 1 As shown, the attachment flow control system of this embodiment includes a hydraulic pump 1, an attachment hydraulic actuator 11, a control main valve 10 for controlling the attachment hydraulic actuator 11, a control device for controlling the switching of the control main valve 10, and a flow regulating device. The flow regulating device includes a flow regulating solenoid valve group 2 and an instrument.
[0025] The flow regulating solenoid valve group 2 is connected between the control main valve 10 and the hydraulic pump 1 , and is used to regulate the maximum flow of the oil inlet to the control main valve 10 .
[0026] The instrument is electrically connected to the flow regulating solenoid valve group 2 , and is used for inputting a flow regulating signal and outputting a flow control current corresponding to the flow regulating signal to the flow regulating solenoid valve group 2 .
[0027] The first oil replenishment relief valve 8 and the second oil replenishment relief valve 9 are respectively arranged on the two connecting oil lines between the control main valve 10 and the attachment hydraulic actuator 11. The first oil replenishment relief valve 8 and the second oil replenishment relief valve 9 are both composed of a relief valve and a check valve in parallel, which play the role of overload protection and oil replenishment. A safety valve 7 is arranged on the oil inlet line of the control main valve 10, and the safety valve 7 plays the role of limiting the maximum pressure of the system.
[0028] In this embodiment, the operator can input a flow value (i.e., a flow adjustment signal) that matches the attachment hydraulic actuator 11 through the instrument, and the instrument outputs a corresponding flow control current according to the input flow value, so that the maximum flow that the flow adjustment solenoid valve group 2 can output matches the attachment hydraulic actuator 11. By inputting the target value of the maximum flow through the instrument and controlling the maximum flow of the flow adjustment solenoid valve group 2 through electronic control, the flow adjustment is convenient and accurate.
[0029] Optionally, the instrument includes an instrument controller 12 that outputs flow control current to the flow regulating solenoid valve group 2, and an input and display module 13 electrically connected to the instrument controller 12. Further, the input and display module 13 is composed of a touch display or a display and an adjustment knob. The flow value is input through the touch display or the adjustment knob, and is intuitively displayed on the display, which facilitates the flow regulation operation.
[0030] Optionally, the hydraulic pump 1 is a gear pump, and the gear control device 14 of the engine driving the hydraulic pump 1 is electrically connected to the instrument controller 12, and the instrument controller 12 displays the flow range corresponding to the working gear of the engine on the input and display module 13 according to the setting. The output flow of the gear pump is related to its rotation speed, that is, it is associated with the gear of the engine driving the hydraulic pump 1. The instrument controller 12 is electrically connected to the gear control device 14 of the engine, obtains the gear of the engine, and displays the flow range (the maximum flow that the hydraulic pump can provide) on the input and display module 13 according to the engine gear, so that the operator can intuitively judge whether the flow output of the hydraulic pump can meet the flow demand of the attachment hydraulic actuator 11. If the flow value input by the operator (that is, the flow demand of the attachment hydraulic actuator) is greater than the flow range displayed by the input and display module 13, it means that the current flow output of the hydraulic pump cannot meet the flow demand of the attachment hydraulic actuator 11. The operator can increase the engine gear to increase the output flow of the hydraulic pump, thereby meeting the flow demand of some large-flow attachment hydraulic actuators 11.
[0031] Optionally, the gear control device 14 is composed of an engine control unit or an engine gear knob. The instrument controller 12 can directly obtain the engine speed from the engine control unit to determine its gear position and further determine the output flow of the hydraulic pump, or the instrument controller 12 obtains the gear information from the engine gear knob to determine the output flow of the hydraulic pump.
[0032] Optionally, the flow regulating solenoid valve group 2 includes a regulating solenoid valve 21 and a pressure compensating valve 22 .
[0033] The electromagnet of the regulating solenoid valve 21 is electrically connected to the instrument controller 12, and the oil inlet and outlet ports of the regulating solenoid valve 21 are correspondingly connected to the hydraulic pump 1 and the control main valve 10. The regulating solenoid valve 21 can adjust the valve opening between its oil inlet and outlet ports according to the flow control current.
[0034] The oil inlet and outlet of the pressure compensating valve 22 are connected to the oil inlet of the regulating solenoid valve 21 and the hydraulic oil tank 3, the spring chamber of the pressure compensating valve 22 is connected to the oil outlet of the regulating solenoid valve 21 (the spring chamber is connected to the valve after the regulating solenoid valve 21), the control chamber of the pressure compensating valve 22 is connected to the oil inlet of the regulating solenoid valve 21 (the controller is connected to the valve before the regulating solenoid valve 21), and the pressure of the spring chamber and the control chamber of the pressure compensating valve 22 acts on both ends of its valve core to adjust the valve opening between the oil inlet and outlet of the pressure compensating valve 22. The instrument controller controls the valve opening of the regulating solenoid valve 21 by outputting a flow control current, thereby adjusting the maximum flow to the control main valve 10, and the excess flow provided by the hydraulic pump 1 flows to the hydraulic oil tank 3 through the pressure compensating valve 22.
[0035] Furthermore, the pressure compensation valve 22 is a four-way valve, whose first oil inlet is connected to the oil inlet of the regulating solenoid valve 21, the first oil outlet is connected to the hydraulic oil tank 3, and the oil outlet of the regulating solenoid valve 21 is connected to the control main valve 10 through the second oil inlet and the second oil outlet of the pressure compensation valve 22. The change of the valve opening between the first oil inlet and the second oil outlet is opposite to the change of the valve opening between the second oil inlet and the second oil outlet. The valve core of the pressure compensation valve 22 moves with the change of the pressure difference between the valve before and after the regulating solenoid valve 21, and further adjusts the flow to the control main valve when the hydraulic actuator of the attachment is actuated. When the valve opening of the control main valve 10 increases, the flow to the hydraulic actuator of the attachment increases, the pressure difference between the valve before and after the regulating solenoid valve 21 decreases, the valve core of the pressure compensation valve 22 moves toward the control chamber, the valve opening between the second oil inlet and the second oil outlet increases, the flow to the control main valve increases, the valve opening between the first oil inlet and the second oil outlet decreases, and the flow to the hydraulic oil tank decreases. Similarly, when the valve opening of the control main valve 10 is small, the flow to the hydraulic actuator of the accessory is small, the pressure before and after the valve of the regulating solenoid valve 21 increases, the valve core of the pressure compensation valve 22 moves toward the spring chamber, the valve opening between the second inlet and outlet oil ports decreases, the flow to the control main valve 10 decreases, the valve opening between the first inlet and outlet oil ports increases, and the flow to the hydraulic oil tank 3 increases.
[0036] Optionally, the control device may also include a controller 5, an electric control handle 4 electrically connected to the controller 5, and an electric proportional pilot valve 6 electrically connected to the controller 5. The pilot oil port of the electric proportional pilot valve 6 is connected to the hydraulic control end of the control main valve 10, and the oil inlet is connected to the pilot pressure oil source. The pilot pressure oil source may be a pilot pump or a pilot oil supply valve. The pilot oil supply valve reduces the high-pressure working pressure oil in the hydraulic system to obtain low-pressure pilot pressure oil for pilot control. The control device may also include a controller 5 and an electric control handle 4 electrically connected to the controller 5; the control main valve 10 is an electromagnetic valve in which the electromagnet is electrically connected to the controller. The controller directly drives the control valve to change direction by outputting a control current.
[0037] This embodiment provides a construction machine having the aforementioned attachment flow control system. The construction machine may be an excavator or a loader.
Claims
1. An attachment flow control system, comprising a hydraulic pump, an attachment hydraulic actuator, a control main valve for controlling the attachment hydraulic actuator, a control device for controlling the switching of the control main valve, and a flow regulating device, characterized in that: The flow regulating device comprises: A flow regulating solenoid valve group, connected between the control main valve and the hydraulic pump, for regulating the maximum flow to the oil inlet of the control main valve; The instrument is electrically connected to the flow regulating solenoid valve group and is used for inputting a flow regulating signal and outputting a flow control current corresponding to the flow regulating signal to the flow regulating solenoid valve group.
2. The attachment flow control system according to claim 1, characterized in that: The instrument comprises an instrument controller for outputting flow control current to the flow regulating solenoid valve group, and an input and display module electrically connected to the instrument controller.
3. The attachment flow control system according to claim 2, characterized in that: The input and display module is composed of a touch display or a display and an adjusting knob.
4. The attachment flow control system according to claim 2, characterized in that: The hydraulic pump is a gear pump, and the gear control device of the engine driving the hydraulic pump is electrically connected to the instrument controller. The instrument controller displays the flow range corresponding to the engine working gear on the input and display module according to the setting.
5. The attachment flow control system according to claim 1, characterized in that: The gear control device is composed of an engine control unit or an engine gear knob.
6. The attachment flow control system according to any one of claims 1 to 5, characterized in that: The flow regulating solenoid valve group includes a regulating solenoid valve and a pressure compensating valve; The electromagnet of the regulating solenoid valve is electrically connected to the instrument, the oil inlet and outlet ports of the regulating solenoid valve are correspondingly connected to the hydraulic pump and the control main valve, and the regulating solenoid valve can adjust the valve opening between the oil inlet and outlet ports according to the flow control current; The oil inlet and outlet ports of the pressure compensating valve are connected to the oil inlet port of the regulating solenoid valve and the hydraulic oil tank correspondingly, the spring chamber of the pressure compensating valve is connected to the oil outlet port of the regulating solenoid valve, and the control chamber of the pressure compensating valve is connected to the oil inlet port of the regulating solenoid valve. The pressure in the spring chamber and the control chamber of the pressure compensating valve acts on both ends of the valve core to adjust the valve opening between the oil inlet and outlet ports of the pressure compensating valve.
7. The attachment flow control system according to claim 6, characterized in that: The pressure compensating valve is a four-way valve, whose first oil inlet is connected to the oil inlet of the regulating solenoid valve, and the first oil outlet is connected to the hydraulic oil tank. The oil outlet of the regulating solenoid valve is connected to the control main valve via the second oil inlet and the second oil outlet of the pressure compensating valve, and the change in the valve opening between the first oil inlet and the oil outlet is opposite to the change in the valve opening between the second oil inlet and the oil outlet.
8. The attachment flow control system according to claim 1, characterized in that: The control device includes a controller and an electric control handle electrically connected to the controller; the control main valve is an electromagnetic valve whose electromagnet is electrically connected to the controller.
9. The attachment flow control system according to claim 1, characterized in that: The control device includes a controller, an electric control handle electrically connected to the controller, and an electric proportional pilot valve electrically connected to the controller. The pilot oil port of the electric proportional pilot valve is connected to the hydraulic control end of the control main valve, and the oil inlet is connected to the pilot pressure oil source.
10. An engineering machine, characterized in that: A tool flow control system according to any one of claims 1 to 9.