CN113819101B - Load sensitive control multiway valve connecting block - Google Patents
Load sensitive control multiway valve connecting block Download PDFInfo
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- CN113819101B CN113819101B CN202111097224.5A CN202111097224A CN113819101B CN 113819101 B CN113819101 B CN 113819101B CN 202111097224 A CN202111097224 A CN 202111097224A CN 113819101 B CN113819101 B CN 113819101B
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- connecting block
- damping
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- 239000003921 oil Substances 0.000 claims abstract description 144
- 230000001105 regulatory effect Effects 0.000 claims abstract description 91
- 238000013016 damping Methods 0.000 claims abstract description 85
- 238000007789 sealing Methods 0.000 claims description 35
- 230000003139 buffering effect Effects 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 230000009471 action Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 8
- 239000010720 hydraulic oil Substances 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 230000004044 response Effects 0.000 abstract description 7
- 239000010729 system oil Substances 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/022—Flow-dividers; Priority valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/024—Pressure relief valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/027—Check valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/001—Servomotor systems with fluidic control
Abstract
The invention protects a load sensitive control multi-way valve connecting block, which comprises a connecting block valve group (1) and a preselection switch valve group (2); the connecting block valve group (1) comprises an overflow valve component (1-1), a system pressure regulating valve component (1-2) and a damping valve component (1-3), wherein the three components are integrally assembled into a whole through a connecting block valve body (1-4) and are communicated through an oil way; the preselection switch valve assembly comprises a preselection switch valve body (2-1), a preselection valve core (2-2), a reset spring assembly (2-3) and an electric proportional pressure reducing valve assembly (2-4). The system oil supply enters the connecting block valve group through the connecting block oil inlet P, passes through a high-pressure oil inlet which is integrated in an oil passage in the connecting block valve body and leads to the preselection switch valve group, the control valve core position of the preselection switch valve group determines the on-off states of the working oil ways Y1 and Y2, and only one working oil way can be communicated with the pressure oil port. The invention has the advantages of high system stability, quick response, reduced system pressure fluctuation and improved control stability.
Description
Technical Field
The invention belongs to the technical field of hydraulic pressure, and particularly relates to a load-sensitive control valve technology.
Background
With the increasing requirements of environmental protection, energy conservation and the like, the current mechanical equipment is developed towards energy conservation, integration, high safety and the like. The load-sensitive control multi-way valve hydraulic system often has a plurality of working joints, and all the working joints have the function of independently controlling the movement of a load. Because of the working condition requirement or the safety requirement, if some execution elements run simultaneously, safety accidents or working logic failure can be caused. The multi-way valve has a plurality of working joints, and the operating handles or the control knobs are more, so that accidents can be caused by certain reasons such as misoperation of operators, control program faults and the like in the control process. In hydraulic systems, the load force of the actuators is time-varying, and it is a technical key how to make the system pressure respond quickly to changes in load pressure, and to maintain a high degree of stability and reliability during pressure changes. High-end products in the domestic market are monopolized abroad at present.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a load-sensitive control multiway valve connecting block which is used for improving the stability and the safety of a load-sensitive control system, enabling the pressure of the system to change along with the change of the load pressure and always keeping slightly higher than the load pressure so as to realize the purpose of energy conservation.
The technical scheme of the invention is as follows:
a load sensitive control multi-way valve connecting block comprises a connecting block valve group and a preselection switch valve group; the connecting block valve group comprises an overflow valve component with a vibration prevention function, a system pressure regulating valve component with a replaceable damping aperture, a damping valve component for reducing system pressure oscillation and rapidly relieving pressure, and a connecting block valve body.
The preselection switch valve assembly comprises a preselection switch valve body, a preselection valve core, a reset spring assembly, an electric proportional pressure reducing valve assembly and a control handle assembly; the preselection switch valve assembly comprises a preselection switch valve body, a preselection valve core, a reset spring assembly, an electric proportional pressure reducing valve assembly and a control handle assembly, wherein the electric proportional pressure reducing valve assembly is used for controlling hydraulic oil pressure of a pressure oil cavity A or a pressure oil cavity B at two ends of the preselection valve core, the preselection valve core moves under the action of pressure oil, and when the control force of the preselection valve core is removed by the reset spring assembly, the preselection valve core returns to the middle position.
The loop connection of the multiway valve connecting block is as follows: the pressure oil connected to the pressure oil port P of the valve body of the connecting block is communicated with the oil port of the overflow valve assembly P1, the oil port of the overflow valve assembly P1 is communicated with the oil port P2, the oil port of the overflow valve assembly P2 is communicated with the oil port of the system pressure regulating valve assembly P3, the oil port of the system pressure regulating valve assembly P3 is communicated with the oil port P4, and the oil port of the system pressure regulating valve assembly P4 is directly communicated with the oil port of the preselected switch valve assembly P5; and an oil return port R of the connecting block valve body is communicated with a port R1 of the overflow valve assembly. The system pressure regulating valve assembly LS1 is communicated with the damping valve assembly LS2, the damping valve assembly L2 is communicated with the LS3 through an internal damping loop, and the damping valve assembly LS3 is communicated with the load feedback pressure oil port LS4 of the multi-way valve reversing link; the oil port of the preselection switch valve group Y2 is communicated with the oil port of the reversing valve Ph of the multi-way valve, and the oil port of the preselection switch valve group Y1 is connected with a working oil way of the executing element.
Further, the system pressure regulating valve assembly comprises a spring, an end cover, a system pressure regulating valve core and a throttling plug, wherein the spring, the end cover, the system pressure regulating valve core and the throttling plug are integrated in the connecting block valve body; the upper end of the spring is propped against the end cover, the lower end of the spring is pressed on the system pressure regulating valve core, the throttle screw plug is arranged at the lower end of the central oil hole of the system pressure regulating valve core, and the throttle screw plug is of a detachable structure, so that the damping with different apertures can be replaced according to the system requirement to be matched with the system so as to ensure that the system operates stably; the feedback pressure cavity is formed in an oil cavity formed by the end cover, the system pressure adjusting valve core and the connecting block valve body, and the system pressure cavity is arranged in the oil cavity formed by the system pressure adjusting valve core, the sealing plug and the connecting block valve body.
Further, the damping valve assembly comprises a damping valve body, a pre-pressing spring seat, a pre-pressing spring, a supporting rod, a pre-pressing steel ball, a one-way spring seat, a one-way spring and a one-way steel ball which are integrated in the connecting block valve body.
The damping valve body is connected in the connecting block valve body through threads, and a part of structural style is removed by large-diameter turning of the threads of the damping valve body at the threads near the bottom end, so that a spiral damping oil duct is formed between the damping valve body and the threads of the connecting block valve body after the damping valve body is installed.
Further, the relief valve assembly (including pressure regulating screw, lock nut, spring seat, pressure regulating spring, sealing ball valve core, sealing valve seat, buffering valve core, steel ball, spring seat, buffering spring, buffering check valve spring, and buffering valve bushing, they are integrated with the connecting block valve body).
The structural design can be seen from the following:
as shown in FIG. 5, according to the invention, the structural design of the system pressure regulating valve core is changed by changing the throttle plug, the lift L of the opening of the control valve core is regulated by the force balance relation of the two ends of the system pressure regulating valve core, so that the flow area of a control window is changed, the system pressure is regulated according to the throttle principle, and the system pressure is slightly higher than the load pressure (about 8-20 bar). The orifice diameter of the throttle plug is changed according to the system characteristics to match the system damping, so that the optimal stability characteristics are obtained.
As shown in FIG. 6, according to the structural design of the damping valve assembly with the combination of thread damping and pre-pressing and one-way functions, when the pressure of an executive component is increased, feedback control oil rapidly acts on the system pressure regulating valve assembly through the one-way valve structure of the damping valve assembly, so that a control window is rapidly reduced, the pressure is rapidly increased, the purpose of rapid response is achieved, when the pressure reduction value of the executive component is smaller, the feedback control oil slowly flows through a thread damping oil duct, and the system pressure regulating valve core is slowly reduced, so that the movement of the system is gentle. When the system pressure reduction value is large, the feedback control oil passes through the pre-pressing valve rapidly, so that the aim of quick response is fulfilled. The system has the characteristics of quick response and stable operation.
As shown in fig. 7, the relief valve assembly with the buffer valve core structure is designed, when the system pressure P value exceeds the relief valve set value, the relief valve is opened, so that the highest pressure of the system is limited. When the relief valve is in unloading, the sealing ball valve assembly rises rapidly, so that the pressure reaches a set value rapidly, and when the pressure overshoot is reduced and the system pressure is reduced, the valve core of the sealing ball of the relief valve is slowly seated, thereby reducing the pressure fluctuation of the system.
The invention has the following advantages:
the invention has the advantages of high system stability, quick response, reduced system pressure fluctuation and improved control stability.
The invention ensures that the working pressure of the system changes along with the change of the load pressure and is always kept slightly higher than the load pressure, thereby having remarkable energy-saving effect; when the load pressure changes suddenly, the instantaneous movement speed of the pressure regulating valve core can be effectively reduced by the damping of the throttling screw plug, so that the movement of the pressure regulating valve core is more stable, the pressure impact in the system operation is reduced, the control precision is effectively improved, and the service life of an executing element is effectively prolonged. The load pressure is increased, the system pressure is rapidly increased, and the response of the executing element is rapid; along with the difference of the load pressure reduction amplitude, the system pressure has two control stages of rapid reduction and gradual reduction, the system pressure fluctuation is small, and the control of the executive component is more stable. The pressure protection function enables the unloading action of the system to be rapid, and the executive component is effectively protected; the boosting process is gentle, the regulating characteristic is extremely little influenced by temperature, so that pressure impact born by each part under the high-pressure working condition is lower, and the stability and reliability of the system are effectively improved.
The invention is suitable for the fields of emergency rescue, petroleum drilling, engineering machinery, agriculture and forestry and the like.
Drawings
FIG. 1 is an outline view of a load-sensitive multiway valve connection block;
figure 2 is an outline view of the connecting block valve block;
FIG. 3 is a cross-sectional view of a pre-selection switch valve block
FIG. 3a is a cross-sectional view A-A of FIG. 3 (only the valve body is shown);
FIG. 4 is a schematic diagram of the system circuit on;
FIG. 5 is a cross-sectional view of a system pressure regulator valve assembly;
FIG. 6 is a cross-sectional view of a damper valve assembly;
FIG. 6a is a partial exploded view of FIG. 6;
FIG. 7 is a cross-sectional view of the anti-rattle relief valve assembly;
fig. 7a is a partial enlarged view of fig. 7.
In the figure:
1. connecting block valve group 2. Preselection switch valve group
1-1 overflow valve Assembly
1-1-1 parts of pressure regulating screw 1-1-2 parts of locking nut 1-1-3 parts of spring seat 1-1-4 parts of pressure regulating spring 1-1-5 parts of sealing ball valve core 1-1-6 parts of sealing valve seat 1-1-8 parts of buffer valve core 1-1-9 parts of steel ball 1-1-10 parts of spring seat 1-1-11 parts of buffer check valve spring 1-1-12 parts of buffer valve bushing;
1-2 System pressure regulating valve Assembly
1-2-1 parts of springs 1-2-2 parts of end covers 1-2-3 parts of system pressure regulating valve cores 1-2-5 parts of throttle plugs 1-2-6 parts of sealing plugs;
1-3 damping valve Assembly
1-3-1 parts of damping valve body 1-3-2 parts of pre-pressing spring seat 1-3-3 parts of pre-pressing spring seat 1-3-4 parts of supporting rod 1-3-5 parts of pre-pressing steel ball 1-3-6 parts of threaded damping oil duct 1-3-7 parts of one-way spring seat 1-3-8 parts of one-way spring 1-3-9 parts of one-way steel ball;
1-4 connecting block valve body
2-1, a pre-selection switch valve body 2-2, a pre-selection switch valve core 2-3, a return spring component 2-4, a proportional pressure reducing valve component 2-5 and a handle component.
Detailed Description
The structure of the present invention is described in detail below with reference to the accompanying drawings:
referring to fig. 1, the connecting block structure of the load sensitive control multiway valve provided by the invention is divided into a connecting block valve group (1) and a preselection switch valve group (2). The oil circuit connection principle of the two parts is shown in fig. 4. The pressure oil outlet P4 of the overflow valve assembly integrated in the connecting block valve bank is connected with the inlet of the preselection switch valve bank P5, the oil port Y1 of the preselection switch valve bank is connected with the working oil way of the executive component, and the oil port Y2 is connected with the pressure oil inlet of the reversing valve. Namely, system oil supply enters the connecting block valve group through the connecting block oil inlet P, passes through a high-pressure oil inlet which is integrated in an oil passage in the connecting block valve body and leads to the preselection switch valve group, the control valve core position of the preselection switch valve group determines the on-off states of the working oil ways Y1 and Y2, and only one working oil way can be communicated with the pressure oil port.
Referring to fig. 3, in this embodiment, the structure of the pre-selection switch valve assembly (2) specifically includes a pre-selection switch valve body (2-1), a pre-selection valve core (2-2), a return spring assembly (2-3), an electro-proportional pressure reducing valve assembly (2-4) and a control handle assembly (2-5). The novel valve is characterized in that the preselection valve core (2-2) is arranged in a valve hole of the preselection switch valve body (2-1), the reset spring assembly (2-3) is arranged on one side of the preselection switch valve body (2-1) and is connected with one end of the preselection valve core through threads, the reset spring assembly (2-3) is fixedly arranged on the right end face of the preselection switch valve body through screw installation, the electric proportional pressure reducing valve assembly (2-4) is fixedly arranged on the right end face of the preselection switch valve body through screw installation, and the control handle assembly (2-5) is connected with the other end of the preselection valve core through a connecting pin and is fixedly arranged on the left end face of the preselection switch valve body through screw installation.
When the valve core of the preselect switch valve bank moves leftwards, the working pressure oil way Y1 is communicated with the system pressure P5, and the Y1 oil way executive component starts working. At this time, the reversing unit of the multi-way valve behind the Y2 oil way is disconnected with the system pressure oil, and a power source is lost, namely, under the working condition, the multi-way valve behind the pre-selection switch valve group cannot be started. The multi-way valve after the preselect switch valve group only has the working capacity when the preselect valve core is switched to the right position. The preselection valve core is provided with two modes of handle control and electric proportion control, and the electric proportion pressure reducing valve is used for controlling the hydraulic oil pressure of a pressure oil cavity A or a pressure oil cavity B at two ends of the preselection valve core, so that the preselection valve core moves under the action of pressure oil. The return spring assembly returns the spool to neutral when the operating force of the preselected spool is removed.
Referring to fig. 2, in this embodiment, the connecting block valve set (1) includes an overflow valve assembly (1-1) with a vibration preventing function, a system pressure adjusting valve assembly (1-2) with a replaceable damping aperture, and a damping valve assembly (1-3) for reducing system pressure oscillation and quick pressure relief, which are integrally assembled through a connecting block valve body (1-4), and are communicated through an oil path.
The oil circuit connection principle of the connecting block valve group (1) is shown in fig. 4. The pressure oil connected to the pressure oil port P of the valve body of the connecting block is communicated with the oil port of the overflow valve assembly P1, the oil port of the overflow valve assembly P1 is communicated with the oil port P2, the oil port of the overflow valve P2 is communicated with the oil port of the system pressure regulating valve assembly P3, and the oil port of the system pressure regulating valve assembly P3 is communicated with the oil port P4. The pressure values of the pressure oils P1, P2, P3 and P4 are equal. The oil port of the system pressure regulating valve component P4 is directly communicated with the oil port of the preselected switch valve component P5. And an oil return port R of the connecting block valve body is communicated with a port R1 of the overflow valve assembly. The system pressure regulating valve assembly LS1 is communicated with the damping valve assembly LS2, the damping valve assembly LS2 is communicated with the LS3 through an internal damping loop (see figure 4), and the damping valve assembly LS3 is communicated with a load feedback pressure oil port (LS 4) of the multi-way valve reversing connection. The pressure value of the multi-way valve reversing link LS4 is always equal to the working pressure of an executive component connected with the multi-way valve. The Y2 port of the preselection switch valve bank is communicated with the Ph port of the multi-way valve reversing link, and the Y1 port of the preselection switch valve bank is connected with a working oil way of the executing element.
Referring to fig. 5, in the present embodiment, the system pressure regulating valve assembly structure integrated in the connection block valve group includes a spring (1-2-1), an end cap (1-2-2), a system pressure regulating valve core (1-2-3), a throttle screw plug (1-2-5), a sealing plug (1-2-6), etc., which are integrated in the connection block valve body (1-2-4).
The upper end of the spring (1-2-1) is propped against the end cover (1-2-2), the lower end of the spring is pressed on the system pressure regulating valve core (1-2-3), and the throttle screw plug (1-2-5) is arranged at the lower end of the central oil hole of the system pressure regulating valve core (1-2-3). The feedback pressure cavity is formed in an oil cavity formed by an end cover (1-2-2), a system pressure adjusting valve core (1-2-3) and a connecting block valve body (1-4), and the system pressure cavity is arranged in the oil cavity formed by the system pressure adjusting valve core (1-2-3), a sealing plug (1-2-6) and the connecting block valve body (1-4).
The throttle screw plug (1-2-5) is of a detachable structure, and damping with different apertures can be replaced according to system requirements so as to be matched with a system to ensure that the operation is stable. The lift L of the opening of the control valve core is regulated through the force balance relation between the two ends of the system pressure regulating valve core, so that the flow area of the control window is changed, and the system pressure is slightly higher than the load pressure.
When the system pressure regulating valve assembly is used, when the system pressure regulating valve shaft is in the axial direction, the difference between the acting force Fp of the pressure oil P and the acting force Fls of the load feedback oil LS generated by the working pressure of the actuating element is equal to the pre-tightening force Ft of the spring, and the magnitude of the pre-tightening force of the spring determines the magnitude of the axial opening L of the valve core, so that the magnitude of the opening of the control port of the system pressure regulating valve core is determined. For a constant flow system, according to the throttling principle that flow flows through small holes, pressure difference can be generated before and after the small holes, and the larger the aperture of the small holes is, the lower the system pressure is, the smaller the aperture is, and the larger the system pressure is. The opening of a control window of the system pressure regulating valve core determines the size of a pressure oil port P. Therefore, the system pressure only operates under the condition that the working pressure PLs of the executing element and the pre-tightening force of the spring are equivalent to the sum of the pressure Pt of the valve core of the system pressure regulation, and the constant flow system approximately operates under the load pressure PLs because the Pt value is smaller (8-20 bar), so that the aim of saving energy is achieved. If the Pressure (PLs) of the actuating element changes instantaneously, the valve core of the system pressure adjusting valve is out of balance, and the window size of the valve core changes accordingly, so that the system pressure changes along with the change, and finally, a new balance state is achieved. And if the pressure oil way of the executing element is directly connected with the system pressure regulating valve core. The instantaneous large fluctuation of the pressure of the actuating element causes large displacement of the system pressure regulating valve core, thereby causing large change of the system pressure P and causing abnormality such as system pressure fluctuation, impact, instability and the like.
In the invention, load feedback oil generated by an executive component pressure oil way is connected with a system pressure regulating valve group through a damping valve component integrated in the connecting block valve group. The damping valve assembly has a structure shown in FIG. 6, and comprises a damping valve body (1-3-1), a pre-pressing spring seat (1-3-2), a pre-pressing spring (1-3-3), a supporting rod (1-3-4), a pre-pressing steel ball (1-3-5), a one-way spring seat (1-3-7), a one-way spring (1-3-8), a one-way steel ball (1-3-9) and the like, which are integrated in a connecting block valve body (1-3-6).
The pre-pressing steel ball (1-3-5) is in contact with a conical surface at the bottom of the damping valve body hole, the conical surface of the pre-pressing spring seat (1-3-2) arranged at the lower part of the damping valve body hole is in contact with the pre-pressing steel ball, the end face of the supporting rod (1-3-4) is in contact with the end face of the pre-pressing spring seat, one end of the pre-pressing spring (1-3-3) is in contact with a step face of the pre-pressing spring seat, and the other end of the pre-pressing spring is in contact with a step face of the pre-pressing spring seat at the upper part of the damping valve body hole.
The damping valve body (1-3-1) is connected in the connecting block valve body (1-4) through threads, the upper end of the damping valve body is installed on the connecting block valve body (1-4) through a step surface, and a screw type damping oil duct (1-3-6) is formed between the damping valve body and the connecting block valve body of the damping valve assembly and the screw thread of the connecting block valve body, which is close to the bottom end, namely, a mode of removing a part of the screw thread of the damping valve body through large-diameter turning is adopted as shown in fig. 6a, so that after the damping valve body is installed, a screw type damping oil duct (1-3-6) is formed between the damping valve body and the screw thread of the connecting block valve body.
The damping valve assembly is structurally designed so that when load feedback Pressure (PLs) pressure generated by the actuator pressure is increased, the flow of the feedback loop is quickly communicated with a feedback pressure cavity of the system pressure regulating valve core through a one-way valve of the damping valve assembly, so that a control window of the system pressure regulating valve is quickly reduced, and the system pressure is lifted to be matched with the actuator pressure. And the overshoot of the system pressure is slowly unloaded through a threaded damping oil duct of the damping valve assembly, and the system pressure regulates the smooth movement of the valve core, so that the working pressure is stable. When the Pressure (PLs) of the executive component is reduced, the system pressure regulating valve core moves towards the increasing direction of the control window under the action of pressure oil P of the system pressure cavity, and the flow of the feedback pressure cavity of the extrusion system pressure regulating valve core slowly flows out through the threaded damping oil duct, so that the purpose of slowing down the movement speed of the system pressure regulating valve core is achieved, and the movement of the system is changed stably. The value of the decrease in actuator pressure (Pls) is greater. The system pressure regulating valve core is characterized in that when the pressure difference between two ends of the system pressure regulating valve core is larger, the acceleration obtained by the system pressure regulating valve core is larger, the valve core moving speed is also faster, namely the hydraulic oil flowing speed of a feedback pressure cavity of the system pressure regulating valve core is also higher, the pressure of the feedback pressure cavity of the system pressure regulating valve core is increased along with the pressure according to a small hole throttling principle, and when the pressure is larger than the opening pressure (25 bar) of a check valve of a damping valve assembly, the flow of the feedback pressure cavity is quickly unloaded through the check valve, so that the system pressure regulating valve core is quickly moved to a target value. The fine adjustment of the P value of the pressure oil port is realized by slowly displacing the pressure regulating valve core of the system through a threaded damping oil duct structure to change the size of a control window. The system works stably through the functional structural design.
Referring to fig. 7, in this embodiment, the connection block valve set further integrates an overflow valve assembly with a vibration preventing function, the overflow valve assembly includes a pressure adjusting screw (1-1-1), a lock nut (1-1-2), a spring seat (1-1-3), a pressure adjusting spring (1-1-4), a sealing ball valve core (1-1-5), a sealing valve seat (1-1-6), a buffer valve core (1-1-8), a steel ball (1-1-9), a spring seat (1-1-10), a buffer spring (1-1-11), a buffer check valve spring (1-1-12), a buffer valve bushing (1-1-13), and the like, which are integrated with the connection block valve body (1-1-7).
The pressure regulating screw (1-1-1) is connected with the lock nut (1-1-2) through threads, the threaded end face of the pressure regulating screw is in contact with the bottom surface of a groove of the spring seat (1-1-3), one end of the pressure regulating spring (1-1-4) is in contact with the step surface of the protruding end of the spring seat, the other end of the pressure regulating spring is in contact with the step surface of the sealing ball valve core (1-1-5), the protruding end step surface of the sealing valve seat (1-1-6) is in contact with the inner step surface of the connecting block valve body (1-4), the conical surface of the sealing valve seat is in contact with the ball end face of the sealing ball valve core, the conical surface end of the buffering valve core (1-1-8) is in contact with the ball end face of the sealing ball valve core, the steel ball (1-1-9) is in contact with the bottom hole in the middle of the buffering valve core, the spring seat (1-1-10) is in contact with the step surface of the buffering valve core, one end of the buffering spring (1-1-11) is in contact with the step surface of the spring seat (1-1-1-5), the other end of the buffering valve seat is in contact with the bottom surface of the sealing hole, the one end of the buffering valve (1-1-12) is in contact with the bottom surface of the sealing valve core is in contact with the ball end face of the sealing valve core (13).
When the system pressure value P exceeds the relief valve set point, the relief valve will open so that the maximum value of the pressure port P is limited. The overflow valve is provided with a buffer valve core structural design, when the overflow valve needs unloading, the sealing ball valve core rises rapidly, so that the pressure reaches a set value rapidly, and the buffer valve core rises under the action of the buffer spring and is kept in fit with the sealing sphere. The working condition buffering one-way valve is in an opening state, so that the buffering valve core can move rapidly. When the pressure overshoot is reduced and the system pressure is reduced, the overflow valve sealing ball valve core falls back, the buffer check valve is in a closed state, the buffer valve core supports the sealing ball valve core, the falling speed is slow, the speed is determined by a clearance value between the buffer valve core and the buffer valve sleeve, and the buffer valve core and the buffer valve sleeve have longer contact length, so that reliable damping can be provided in a larger hydraulic oil viscosity range, and the pressure fluctuation of the system is reduced.
The working principle of the whole load sensitive control multi-way valve connecting block is as follows:
referring to fig. 4, the system oil supply enters the connecting block valve group through the connecting block oil inlet P, passes through the high-pressure oil inlet opening integrated in the internal oil duct of the connecting block valve body and leads to the preselection switch valve group, and the control valve core position of the preselection switch valve group determines the on-off states of the working oil way Y1 and the working oil way Y2. And only one working oil passage can be communicated with the pressure oil port, see fig. 3. Thus, the condition that the executive component of the working oil way Y1 and the executive component connected with the working oil way Y2 work simultaneously is avoided.
Through the system pressure regulating valve component integrated in the connecting block valve bank, as shown in fig. 5, the opening degree of the control port of the system pressure regulating valve core is determined through the force balance relation among the system pressure cavity oil pressure, the feedback pressure cavity oil pressure and the pre-tightening spring on the system pressure regulating valve core shaft, for a constant flow system, according to the throttling principle that flow flows through small holes, pressure difference can be generated before and after the control port of the system pressure regulating valve core, the larger the aperture of the small holes is, the lower the system pressure is, the smaller the aperture is, and the larger the system pressure is. The opening of the control window of the system pressure regulating valve core determines the system pressure and oil pressure and keeps only slightly higher than the load pressure value. During the whole adjusting process, the aperture of the damping screw plug can influence the stability of the valve core. The damping screw plug is of a detachable structural design, and an optimal value can be selected according to the system requirement so as to reduce pressure fluctuation in the running process of the system.
The feedback pressure oil way of the executing element is connected with the feedback pressure cavity of the system pressure regulating valve group (2) through a damping valve component (1-3) integrated in the connecting block valve group. When the load pressure is increased, the flow of the feedback loop is quickly communicated with the feedback pressure cavity of the system pressure regulating valve core through the one-way valve of the damping valve assembly, so that the control window of the three-way flow valve is quickly reduced, and the system pressure is increased to be matched with the pressure of the actuating element. The overshoot of the system pressure is slowly unloaded through the threaded damping oil duct of the damping valve assembly, so that the system pressure regulating valve core moves slowly, the working pressure is stable, when the load pressure is reduced, the system pressure regulating valve core moves towards the increasing direction of the control window under the action of pressure oil in the system pressure oil cavity, the flow of the feedback pressure cavity of the extrusion system pressure regulating valve core slowly flows out through the threaded damping oil duct, the purpose of slowing down the movement speed of the system pressure regulating valve core is achieved, and the system movement is changed stably. When the load pressure reduction value is larger, namely the pressure difference between two ends of the system pressure regulating valve core is larger, the acceleration obtained by the system pressure regulating valve core is larger, the valve core moving speed is also higher, namely the hydraulic oil flowing speed of the feedback pressure cavity of the system pressure regulating valve core is also higher, the pressure of the feedback pressure cavity of the system pressure regulating valve core is increased along with the pressure according to the orifice throttling principle, and when the pressure is larger than the opening pressure (25 bar) of the one-way valve, the flow of the feedback pressure cavity is quickly unloaded through the one-way valve, so that the system pressure regulating valve core is quickly moved to a target value. The fine adjustment of the system pressure value is realized by slowly displacing the system pressure regulating valve core through the threaded damping oil duct structure to change the size of the control window, and the system is enabled to work stably while having quick correspondence through the functional structural design.
The relief valve is integrated in the connecting block valve group and is provided with a buffer structure, and under the unloading working condition, the relief action of the relief valve is quick through the opening of the buffer one-way valve. Under the pressure-increasing working condition, the closing speed of the overflow valve core is slowed down through the damping action between the closing of the one-way valve and the valve sleeve of the pressure-stabilizing valve core. Therefore, the structural design gives consideration to the characteristics of quick response, system pressure fluctuation reduction and control stability improvement.
Claims (10)
1. A load sensitive control multi-way valve connecting block comprises a connecting block valve group (1) and a preselection switch valve group (2); the connecting block valve group (1) comprises an overflow valve component (1-1), a system pressure regulating valve component (1-2) and a damping valve component (1-3), wherein the three components are integrally assembled into a whole through a connecting block valve body (1-4), and are communicated through an oil way;
the preselection switch valve assembly (2) comprises a preselection switch valve body (2-1), a preselection valve core (2-2), a reset spring assembly (2-3), an electric proportional pressure reducing valve assembly (2-4) and a control handle assembly (2-5), wherein the electric proportional pressure reducing valve assembly (2-4) is used for controlling hydraulic oil pressure of a pressure oil cavity A or a pressure oil cavity B at two ends of the preselection valve core, so that the preselection valve core (2-2) moves under the action of pressure oil, and when the control force of the preselection valve core (2-2) is removed, the reset spring assembly (2-3) enables the preselection valve core to return to the middle position;
the loop connection of the multiway valve connecting block is as follows: the pressure oil connected to the pressure oil port P of the valve body of the connecting block is communicated with the oil port of the overflow valve assembly P1, the oil port of the overflow valve assembly P1 is communicated with the oil port P2, the oil port of the overflow valve assembly P2 is communicated with the oil port of the system pressure regulating valve assembly P3, the oil port of the system pressure regulating valve assembly P3 is communicated with the oil port P4, and the oil port of the system pressure regulating valve assembly P4 is directly communicated with the oil port of the preselected switch valve assembly P5; the oil return port R of the valve body of the connecting block is communicated with the port R1 of the overflow valve assembly, the port LS1 of the system pressure regulating valve assembly is communicated with the port LS2 of the damping valve assembly, the port LS2 of the damping valve assembly is communicated with the port LS3 of the damping valve assembly through an internal damping loop (see figure 4), and the port LS3 of the damping valve assembly is communicated with the load feedback pressure port LS4 of the reversing linkage of the multi-way valve; the Y2 port of the preselection switch valve bank is communicated with the Ph port of the multi-way valve reversing link, and the Y1 port of the preselection switch valve bank is connected with a working oil way of the executing element.
2. The load sensitive control multiway valve connection block of claim 1, wherein the system pressure regulating valve assembly (1-2) comprises a spring (1-2-1), an end cap (1-2-2), a system pressure regulating valve core (1-2-3), a throttle plug screw (1-2-5) integrated into the connection block valve body (1-4); the upper end of the spring (1-2-1) is propped against the end cover (1-2-2), the lower end of the spring is pressed on the system pressure regulating valve core (1-2-3), and the throttle screw plug (1-2-5) is arranged at the lower end of the central oil hole of the system pressure regulating valve core (1-2-3); the feedback pressure cavity is formed in an oil cavity formed by an end cover (1-2-2), a system pressure adjusting valve core (1-2-3) and a connecting block valve body (1-4), and the system pressure cavity is arranged in the oil cavity formed by the system pressure adjusting valve core (1-2-3), a sealing plug (1-2-6) and the connecting block valve body (1-4).
3. The connecting block of the load sensitive control multi-way valve according to claim 2, wherein the throttle screw plug is of a detachable structure, the damping of different apertures is replaced according to the system requirement, and the lift L of the opening of the control valve core is adjusted by adjusting the force balance relation of the two ends of the valve core through the system pressure, so that the flow area of the control window is changed, and the system pressure is slightly higher than the load pressure.
4. A load sensitive control multiway valve connection block according to claim 1, 2 or 3, wherein the damping valve assembly (1-3) comprises a damping valve body (1-3-1), a pair of pre-loaded spring seats (1-3-2), a pre-loaded spring (1-3-3), a support rod (1-3-4), a pre-loaded steel ball (1-3-5), a one-way spring seat (1-3-7), a one-way spring (1-3-8), a one-way steel ball (1-3-9) integrated in the connection block valve body (1-4).
5. The load-sensitive control multi-way valve connecting block according to claim 4, wherein the pre-pressing steel ball (1-3-5) is installed in contact with a conical surface at the bottom of the damping valve body hole, the conical surface of the pre-pressing spring seat (1-3-2) installed at the lower part of the damping valve body hole is installed in contact with the pre-pressing steel ball, the end face of the supporting rod (1-3-4) is installed in contact with the end face of the pre-pressing spring seat, one end of the pre-pressing spring (1-3-3) is installed in contact with a step face of the pre-pressing spring seat, and the other end of the pre-pressing spring seat is installed in contact with a step face of the pre-pressing spring seat at the upper part of the damping valve body hole.
6. The connection block for the load-sensitive control multi-way valve according to claim 4, wherein the damping valve body (1-3-1) is connected in the connection block valve body (1-4) through threads, the upper end of the damping valve body is installed on the connection block valve body (1-4) through a step surface, and a part of the threads of the damping valve body is removed through large-diameter turning at the thread position close to the bottom end, so that a spiral damping oil duct (1-3-6) is formed between the damping valve body and the threads of the connection block valve body after the damping valve body is installed.
7. A load sensitive control multiway valve connection block according to claim 1, 2 or 3, wherein the relief valve assembly (1-1) comprises a pressure regulating screw (1-1-1), a lock nut (1-1-2), a spring seat (1-1-3), a pressure regulating spring (1-1-4), a sealing ball valve core (1-1-5), a sealing valve seat (1-1-6), a damping valve core (1-1-8), a steel ball (1-1-9), a spring seat (1-1-10), a damping spring (1-1-11), a damping check valve spring (1-1-12), and a damping valve bushing (1-1-13), which are integrated in the connection block valve body (1-4).
8. The load-sensitive control multi-way valve connecting block according to claim 7, wherein the pressure regulating screw (1-1-1) is connected with the lock nut (1-1-2), the threaded end face of the pressure regulating screw is in contact with the bottom surface of the groove of the spring seat (1-1-3), one end of the pressure regulating spring (1-1-4) is in contact with the step surface of the protruding end of the spring seat, the other end of the pressure regulating spring is in contact with the step surface of the sealing ball valve core (1-1-5), the protruding end step surface of the sealing valve seat (1-1-6) is in contact with the inner step surface of the connecting block valve body (1-4), the conical surface of the sealing valve seat is in contact with the spherical end of the sealing valve core, the conical surface of the buffering valve core (1-1-8) is in contact with the bottom surface of the middle part of the buffering valve core, the spring seat (1-1-10) is in contact with the step surface of the buffering valve core, one end of the buffering spring (1-1-11) is in contact with the step surface of the buffering valve core, the other end of the sealing valve seat (1-1-10) is in contact with the bottom surface of the sealing valve core, the one end of the sealing valve seat is in contact with the ball seat (1-1-1-12) is in contact with the bottom surface of the buffering valve core (1-1-1-12), the flat end surface of the buffer valve bushing (1-1-13) is in contact installation with the bottom surface of the sealing valve seat hole.
9. A load sensitive control multiway valve connecting block according to claim 1, 2 or 3, characterized in that the preselection valve core (2-2) of the preselection switch valve assembly (2) is arranged in a valve hole of the preselection switch valve body (2-1), the reset spring assembly (2-3) is connected with one end of the preselection valve core and is installed and fixed on the right end face of the preselection switch valve body, the electric proportional pressure reducing valve assembly (2-4) is installed and fixed on the right end face of the preselection switch valve body, the control handle assembly (2-5) is connected with the other end of the preselection valve core through a connecting pin and is installed and fixed on the left end face of the preselection switch valve body; when the pre-selection valve core (2-2) moves leftwards, the working pressure oil way Y1 is communicated with the system pressure P5, the Y1 oil way executing element starts to work, at the moment, the multi-way valve reversing unit behind the Y2 oil way is disconnected with the system pressure oil, and a power source is lost, namely under the working condition, the multi-way valve unit behind the pre-selection switch valve group cannot be started, and only when the pre-selection valve core is reversed to the right position, the multi-way valve unit behind the pre-selection switch valve group has the working capacity.
10. The load-sensitive control multiway valve connecting block according to claim 1, 2 or 3, wherein the left and right direction change of the pre-selection switch valve core of the pre-switch valve group is adopted, so that only 1 path of oil ports of the oil path Y1 and Y2 are communicated with the oil port of the pressure oil path P5 in operation, when the oil port of the pressure oil path P5 is communicated with the oil port of the working oil path Y1, the oil port of the Y2 and the oil port of the pressure oil path P5 are in a disconnection state, the multiway valve working link connected behind the pre-selection switch valve group is disabled, and only the executive component connected with the oil port of the working oil path Y1 can work.
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