Inside and outside combined control cartridge valve oil way
By using a cartridge valve oil circuit with combined internal and external control, and by employing the design of an electromagnetic ball valve and an accumulator, stable pressure holding and rapid braking of the slider in the hydraulic system are achieved. This solves the overshoot and vibration problems in the slider position control of the hydraulic cartridge valve, and improves positioning accuracy and system stability.
Patent Information
- Application Number
- CN202423180967.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-23
AI Technical Summary
Existing hydraulic cartridge valves are prone to position overshoot and impact vibration during the rise and fall of the slide block, resulting in inaccurate positioning. In particular, when the system pressure increases instantaneously, the main valve core may open momentarily, affecting the pressure holding and braking effect of the slide block.
The cartridge valve oil circuit adopts a combination of internal and external control systems. It uses electromagnetic ball valves and accumulators, and through three-phase pressure automatic selection and damping design, it ensures that the main valve core does not open when the system is pressurized instantaneously, and quickly closes the main valve core when the slider descends, so as to achieve rapid braking.
It effectively prevents the main valve core from opening instantaneously when the system pressure increases instantaneously, ensuring the pressure holding stability of the slider, and achieving rapid braking when the slider descends, avoiding position overshoot and impact vibration, and improving positioning accuracy.
Smart Images
Figure CN223498305U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of control oil circuit technology, and in particular relates to a cartridge valve oil circuit with combined internal and external control. Background Technology
[0002] Cartridge valves are used in various hydraulic machinery, with flow rates up to 1000 L / min and diameters ranging from 200 to 250 mm. When used in combination with ordinary hydraulic control valves, they can control the direction, pressure, and flow rate of the hydraulic fluid in the system. The working principle of a hydraulic cartridge valve is mainly based on the pressure changes in the control chambers (X chamber / C chamber) to control the opening and closing of the main valve spool. The opening and closing of ports A and B are determined by controlling the pressure in chambers X and C. When there is no hydraulic pressure in chambers X and C, the main valve spool is opened, and ports A and B are connected, with the flow direction determined by the pressure difference between ports A and B. When there is hydraulic pressure in chambers X and C, the spool is closed, and ports A and B are not connected.
[0003] Cartridge valves can be connected to the inlet and outlet ports of the hydraulic cylinder. The typical actions of the slider are: slider rises, pressure is applied and maintained, and slider retracts. The system pressure depends on the load. During the slider retraction process, the load pressure is relatively small. When the slider returns from rapid retraction to rest, position "overshoot" often occurs, resulting in inaccurate positioning and impact vibration. Utility Model Content
[0004] The purpose of this invention is to provide a cartridge valve oil circuit with combined internal and external control. By controlling the oil pressure in the control chambers, the system has sufficient control pressure to ensure that the main valve core does not open instantaneously even when the system pressure increases instantaneously. At the same time, it can quickly act on the control chamber of the cartridge valve to quickly close the main valve core, thereby achieving rapid braking of the slider.
[0005] To achieve the above objectives, the technical solution of this utility model is as follows: a cartridge valve oil circuit with combined internal and external control, comprising an external control system and an internal control system. The internal control system includes a cartridge valve and three check valves. The cartridge valve includes a valve body, a main valve core, a reset component, and a control component. The main valve core is slidably connected to the valve body. The reset component is located between the main valve core and the valve body and is used to reset the main valve core. The control component is used to control the main valve core. The upper side of the main valve core is cavity C. The valve body on the lower side of the main valve core has three oil ports, designated as ports A, B, and D. Port A of the cartridge valve is connected to the system oil port, and port B of the cartridge valve is connected to the oil port of the cylinder. C cavity is connected to the external control system, port A, and port D respectively, and check valves for unidirectional flow to C cavity are provided on the three connection channels.
[0006] Furthermore, the external control oil system includes a control pump and an accumulator. The control pump is used to transport oil in the oil tank, and the accumulator is installed in the oil line between the control pump and the internal control system.
[0007] Furthermore, the control component is an electromagnetic ball valve.
[0008] Furthermore, the oil inlet pipe of the control component is provided with a first damper.
[0009] Furthermore, a second damping is provided on the oil passage between the C-cavity and the control component.
[0010] Furthermore, the oil outlet of the control component is connected to the oil tank.
[0011] The working principle and beneficial effects of this technical solution are as follows:
[0012] 1. Anti-interference locking function
[0013] When the slider rises, the electromagnet of the control component (solenoid ball valve) is energized, and the pressure oil in chamber C flows back to the oil tank through the control component (solenoid ball valve). Chamber C is depressurized, and under the pressure of port A, the main valve core overcomes the force of the reset component, the main valve core retracts, the slider rises, and pressure is applied and maintained.
[0014] The pressures at ports A, D, and the external control system's outlets are not consistent. This system can automatically select the port with the highest pressure as the control oil source, which flows to chamber C of the cartridge valve through the first damper and the electrical control component (solenoid ball valve).
[0015] Thanks to the adoption of three-phase pressure automatic selection with internal and external control, even if multiple sliders are set, their actions will not interfere with each other.
[0016] Especially when the slider is in the pressure-holding state, when the system pressure increases instantaneously, although the pressurized oil flows to the C chamber through the check valve between the C chamber and the A port, the pressure increase rate in the C chamber lags behind that at the A port due to the first damping effect. This may cause the main valve spool to open instantaneously, affecting the pressure holding of the slider. However, under the external pressure provided by the accumulator, even in the case of instantaneous system pressure increase, the system has sufficient control pressure to ensure that the main valve spool does not open instantaneously.
[0017] 2. Rapid braking function
[0018] When the slider descends, the electromagnet of the control component (solenoid ball valve) is energized, and the pressure oil in chamber C flows back to the oil tank through the control component (solenoid ball valve). Chamber C is depressurized, and under the pressure of port B, the main valve core overcomes the force of the reset component, the main valve core retracts, and the slider returns to its position.
[0019] The system pressure depends on the load. During the slide's retraction, the load pressure is relatively low. When the slide returns from rapid retraction to a standstill, position overshoot often occurs, resulting in inaccurate positioning and impact vibration. At this time, under the external pressure provided by the accumulator, it can quickly act on the C chamber of the cartridge valve, rapidly closing the main valve core, thereby achieving rapid braking of the slide. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the oil circuit of a cartridge valve with combined internal and external control according to this utility model.
[0021] Figure 2 This is a schematic diagram of the principle when the present invention is applied to multiple sets of hydraulic cylinders. Detailed Implementation
[0022] The following detailed description illustrates the specific implementation method:
[0023] The reference numerals in the accompanying drawings include: control pump 1, accumulator 2, internal control system 3, cartridge valve 4, first check valve 5, second check valve 6, third check valve 7, first damper 8, control element 9, and second damper 10.
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0025] The basic implementation examples are as follows: Figure 1The diagram shows a cartridge valve oil circuit with combined internal and external control, comprising an external control system and an internal control system 3. The internal control system 3 includes a cartridge valve 4 and three check valves (a first check valve 5, a second check valve 6, and a third check valve 7). The cartridge valve 4 includes a valve body, a main valve core, a reset element (using a reset spring), and a control element 9 (using a solenoid ball valve). The main valve core is slidably connected to the valve body, and the reset element is located between the main valve core and the valve body for resetting the main valve core. The control element 9 controls the main valve core. The upper side of the main valve core is cavity C, and the valve body below the main valve core has three ports, designated as port A, port B, and port D. Port A of cartridge valve 4 is connected to the system oil port, and port B of cartridge valve 4 is connected to the oil port of the cylinder. Chamber C is connected to ports K, A, and D of the external control system, and each of the three connection channels is equipped with a check valve for unidirectional flow to chamber C. Specifically, a first check valve 5 connects chamber C to port K of the external control system, a second check valve 6 connects chamber C to port A, and a third check valve 7 connects chamber C to port D. The outlet of control component 9 is connected to the oil tank. A first damper 8 is installed on the inlet pipe of control component 9. A second damper 10 is installed on the oil pipe between chamber C and control component 9. The external control oil system includes a control pump 1 and an accumulator 2. The control pump 1 is used to transport oil from the oil tank, and the accumulator 2 is installed on the oil line between the control pump 1 and the internal control system 3.
[0026] like Figure 2 As shown, multiple internal control systems 3 and one external control system are configured, with each internal control system 3 connected to one hydraulic cylinder. The connection port between the external control system and the internal control system 3 is port K, which is... Figure 2 K1 and K2 in the middle.
[0027] The specific implementation process is as follows:
[0028] 1. Anti-interference locking function
[0029] When the slider rises, the electromagnet of the control component 9 (solenoid ball valve) is energized, and the pressure oil in chamber C flows back to the oil tank through the control component 9 (solenoid ball valve). Chamber C is depressurized, and under the pressure of port A, the main valve core overcomes the force of the reset component, the main valve core retracts, the slider rises, and pressure is applied and maintained.
[0030] The pressures at ports A, D, and K of the external control system are not the same. This system can automatically select the port with the highest pressure as the control oil source, which flows to the C chamber of the cartridge valve 4 through the first damper 8 and the electrical control component 9 (solenoid ball valve).
[0031] Thanks to the adoption of three-phase pressure automatic selection with internal and external control, even if multiple sliders are set, their actions will not interfere with each other.
[0032] Especially when the slider is in the pressure-holding state, when the system pressure increases instantaneously, although the pressurized oil flows to the C chamber through the one-way valve between the C chamber and the A port, the pressure increase rate in the C chamber lags behind that at the A port due to the action of the first damper 8. This may cause the main valve core to open instantaneously, affecting the pressure holding of the slider. However, under the external pressure provided by the accumulator 2, even in the case of instantaneous system pressure increase, the system has sufficient control pressure to ensure that the main valve core does not open instantaneously.
[0033] 2. Rapid braking function
[0034] When the slider descends, the electromagnet of the control component 9 (solenoid ball valve) is energized, and the pressure oil in chamber C flows back to the oil tank through the control component 9 (solenoid ball valve). The pressure in chamber C is relieved, and under the pressure of port B, the main valve core overcomes the force of the reset component, the main valve core retracts, and the slider returns to its position.
[0035] The system pressure depends on the load. During the slide's retraction, the load pressure is relatively low. When the slide returns from rapid retraction to a standstill, position overshoot often occurs, resulting in inaccurate positioning and impact vibration. At this time, under the external pressure provided by the accumulator 2, it can quickly act on chamber C of the cartridge valve 4, rapidly closing the main valve core, thereby achieving rapid braking of the slide.
[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0037] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. A cartridge valve oil circuit with combined internal and external control, characterized in that: The system includes an external control system and an internal control system (3). The internal control system (3) includes a cartridge valve (4) and three check valves. The cartridge valve (4) includes a valve body, a main valve core, a reset component, and a control component (9). The main valve core is slidably connected to the valve body. The reset component is located between the main valve core and the valve body and is used to reset the main valve core. The control component (9) is used to control the main valve core. The upper side of the main valve core is cavity C. The valve body on the lower side of the main valve core is provided with three oil ports, namely port A, port B, and port D. Port A of the cartridge valve (4) is connected to the system oil port, and port B of the cartridge valve (4) is connected to the oil port of the cylinder. C cavity is connected to the external control system, port A, and port D respectively, and check valves for unidirectional flow to C cavity are provided on the three connection channels.
2. The cartridge valve oil circuit with combined internal and external control according to claim 1, characterized in that: The external control oil system includes a control pump (1) and an accumulator (2). The control pump (1) is used to transport oil in the oil tank, and the accumulator (2) is installed in the oil line between the control pump (1) and the internal control system (3).
3. The cartridge valve oil circuit with combined internal and external control according to claim 1, characterized in that: The control component (9) is an electromagnetic ball valve.
4. The cartridge valve oil circuit with combined internal and external control according to claim 3, characterized in that: The control component (9) is equipped with a first damper (8) on its oil inlet pipe.
5. The cartridge valve oil circuit with combined internal and external control according to claim 3, characterized in that: A second damper (10) is provided on the oil passage between the C cavity and the control component (9).
6. The cartridge valve oil circuit with combined internal and external control according to claim 3, characterized in that: The oil outlet of the control component (9) is connected to the oil tank.