CN212744561U - Intelligent control system of hydraulic suspension device - Google Patents
Intelligent control system of hydraulic suspension device Download PDFInfo
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- CN212744561U CN212744561U CN202022099228.4U CN202022099228U CN212744561U CN 212744561 U CN212744561 U CN 212744561U CN 202022099228 U CN202022099228 U CN 202022099228U CN 212744561 U CN212744561 U CN 212744561U
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Abstract
The utility model discloses a hydraulic suspension device's intelligence control system, include: two adjacent valve rod sections of a valve rod of the hydraulic distributor are respectively provided with a rising speed control conical surface and a falling speed control conical surface; when the hydraulic distributor is at a rising or falling working position, the valve rod and the valve body form a rising speed throttling gap or a falling speed throttling gap at the rising speed control conical surface or the falling speed control conical surface, the axial displacement of the valve rod is controlled by the electric control unit, the throttling area of the rising speed throttling gap or the falling speed control conical surface can be changed, and the rising or falling speed of the farm implement can be controlled. Because the first working oil way is provided with the stop valve, the stop valve is closed under the action of the return spring in a neutral state, the connection between the rodless cavity of the lifting oil cylinder and the hydraulic distributor is cut off, the agricultural implement settlement caused by leakage of the hydraulic distributor is avoided, and the static settlement requirement of the agricultural implement is met.
Description
Technical Field
The utility model relates to a hydraulic pressure linkage of agricultural equipment especially relates to a hydraulic pressure linkage's intelligence control system.
Background
The hydraulic suspension device of agricultural equipment (such as a tractor) is used for hanging a suspension type or semi-suspension type farm tool, carrying out farm tool lifting and tilling depth adjustment, realizing loading, hydraulic power output and the like. The hydraulic suspension device consists of a hydraulic system and a suspension mechanism, wherein the hydraulic system comprises an oil pump, a distributor, a lifting oil cylinder, an oil cylinder control mechanism and the like, and the suspension mechanism comprises an upper pull rod, a lower pull rod, a lifting arm and the like. On one hand, the ascending, descending, neutral and floating of the farm tool can be realized by operating the distributor, so that the tractor has the functions of position control, force control and force-position comprehensive control, and on the other hand, the active shock absorption of the farm tool can be realized by the hydraulic suspension device in the transition operation.
To the effect of the first aspect, chinese utility model patent CN202385466U discloses an automatically controlled distributor, which adopts electromagnet or motor-driven lead screw nut mechanism as the linear actuator, and controls the valve rod of the distributor to move to the set positions of rising, falling, neutral, floating, etc. through sensor and electronic control unit, so as to realize the intelligent control of the hydraulic lifter. However, the valve rod of the large and medium-sized hydraulic distributor needs to be driven to move, the linear actuator in the above patent technology needs to consume large electric power, and the cost and the service life are limited.
To this end, chinese patent CN103047210A discloses an electrohydraulic control device for a hydraulic distributor, which controls the movement of the distributor through the electrohydraulic control device, and uses the power of a host hydraulic system as the energy source for the movement control of a valve rod, thereby saving the consumption of electric power, but the device still has the following technical defects:
1) when the agricultural equipment is in a farming state, the energy of the system can be wasted by frequently using the pressure of the main oil way;
2) four electromagnetic valves are adopted to control the movement of the valve core, and the structure is complex.
In order to reduce the consumption of system energy and solve the problem of excessive use of main oil circuit pressure when the farm implement is in the working state, chinese utility model patent application CN202020989612.9 discloses an intelligent control system of a hydraulic suspension device, including: the hydraulic distributor comprises four working positions corresponding to a rising working mode, a descending working mode, a neutral working mode and a floating working mode of the agricultural implement respectively, a first working oil port of the hydraulic distributor is communicated with a rodless cavity of the lifting oil cylinder through a first working oil path, a second working oil port of the hydraulic distributor is communicated with a rod cavity of the lifting oil cylinder through a second working oil path, a pressure oil port of the hydraulic distributor is communicated with a main oil path, and the main oil path is provided with a switch valve; the force sensor is used for detecting tension information borne by the lower pull rod or the upper pull rod; a lifter position sensor for detecting position information of the lifter; the valve rod displacement sensor is used for detecting displacement information of a valve rod of the hydraulic distributor; the force sensor, the lifter position sensor and the valve rod displacement sensor are respectively electrically connected with the electric control unit; the energy storage oil way comprises an energy accumulator, and the energy accumulator is communicated with the main oil way through a second one-way valve; the energy accumulator is respectively communicated with the first working oil way and the second working oil way through a pressure reversing valve; one end of a valve rod of the hydraulic distributor is connected with a hydraulic push rod, and the other end of the valve rod of the hydraulic distributor is provided with a return spring; the hydraulic push rod is communicated with the energy storage oil way through an oil charging electromagnetic valve, the hydraulic push rod returns oil and releases pressure through an oil discharging electromagnetic valve, and the oil charging electromagnetic valve and the oil discharging electromagnetic valve are respectively electrically connected with the electric control unit.
When the farm tool is in a rising working mode or a neutral working mode, hydraulic oil of the first working oil way is in a high-pressure state, oil return of the second working oil way is performed, pressure is relieved, and the high-pressure oil of the first working oil way charges the energy accumulator under the action of the high-pressure oil; when the farm tool is in a descending working mode, hydraulic oil of the second working oil way is in a high-pressure state, oil is returned from the first working oil way to be decompressed, and the high-pressure oil of the second working oil way is used for pressurizing the energy accumulator; and only when the farm tool is in a floating working mode, the energy accumulator cannot be charged due to the unloading of the hydraulic oil of the first working oil way and the second working oil way, the switch valve is closed, and the main oil way charges the energy accumulator. Therefore, when the farm tool is in a working state, the using condition of the pressure of the main oil way is less, and the consumption of system energy is reduced.
And when the oil charging electromagnetic valve is electrified and opened, high-pressure oil in the energy accumulator pushes the hydraulic push rod, the valve rod of the hydraulic distributor moves leftwards, and when the oil discharging electromagnetic valve is electrified and opened, hydraulic oil of the hydraulic push rod is decompressed, and the valve rod of the hydraulic distributor moves rightwards under the action of the return spring. The electric control unit detects the stress information of the lower pull rod or the upper pull rod through the force sensor, detects the position information of the lifter through the lifter position sensor, controls the movement of the valve rod of the hydraulic distributor by controlling the on and off of the oil filling electromagnetic valve and the oil discharging electromagnetic valve, and feeds back the position information of the valve rod through the valve rod displacement sensor, so that the ascending, descending, centering and floating functions of the farm implement are realized. Compared with the scheme that four electromagnetic valves control the valve rods, the valve rod of the hydraulic distributor can be controlled by only two electromagnetic valves and one return spring, and the structure is simpler and more reliable.
However, in the using process, the hydraulic system can not adjust the rising and falling speeds of the farm tool, and the performance of the electric control system of the tractor is limited.
The hydraulic suspension device on the other hand is used for actively damping the farm tool.
The basic principle of active shock absorption is that the vertical motion of a lifting oil cylinder is utilized to compensate the vertical shock of the articulated farm implement, when a tractor starts to shock due to the reason of the road surface, an electric control unit collects the information of a force sensor and a position sensor, the shock amplitude and the direction of the farm implement are judged, and an electric control hydraulic valve is used for charging or discharging oil to a rod cavity and a rodless cavity of the lifting oil cylinder, so that the lifting oil cylinder generates displacement opposite to the shock direction, and the shock of the articulated farm implement is reduced. This has proposed very high requirement to the responsiveness of automatically controlled unit and automatically controlled hydrovalve, and in the application, there is the action lag problem in the lift cylinder, seriously influences the shock attenuation effect.
In order to reduce the responsiveness requirements on an electric control unit and an electric control hydraulic valve and improve the active damping effect on a hitching agricultural implement, chinese patent CN111520367A discloses an electric control hydraulic system of a hydraulic hitch, a tractor and an active damping control method, wherein a first overflow pressure maintaining branch oil path for performing overflow pressure maintaining on a rodless cavity of a lift cylinder and a second overflow pressure maintaining branch oil path for performing overflow pressure maintaining on a rod cavity of the lift cylinder are arranged between a first working oil path and a second working oil path, and the first overflow pressure maintaining branch oil path and the second overflow pressure maintaining branch oil path are provided with electric control switch valves.
When the traction agricultural equipment (tractor) hung with agricultural implements starts to transition operation, the vibration generated by bumpy road surface can make the cylinder body and the piston rod of the lifting oil cylinder instantaneously generate relative motion, so that high-pressure oil is generated in a rodless cavity or a rod cavity, and because a first overflow pressure-maintaining branch oil way and a second overflow pressure-maintaining branch oil way are arranged between the first working oil way and the second working oil way, the high-pressure oil can automatically flow to the other cavity of the lifting oil cylinder through the first overflow pressure-maintaining branch oil way or the second overflow pressure-maintaining branch oil way, so that the vibration amplitude of the articulated agricultural implements is smaller than that of the traction agricultural equipment, and active damping is realized; in the automatic oil filling step, an electric control hydraulic valve is not needed, so that the response hysteresis phenomenon does not exist; before the automatic oil filling step is finished, the electric control hydraulic valve can be started in advance, and when the automatic oil filling step is finished, hydraulic oil can be immediately supplemented from the main oil circuit to the cavity of the high-pressure oil flowing out through the electric control hydraulic valve.
When the hydraulic cylinder body of the lifting oil cylinder moves upwards relative to the piston rod instantaneously, the volume of hydraulic oil flowing out of the rodless cavity is more than that of the hydraulic oil required by the rod cavity, and the damping effect is influenced; similarly, when the cylinder body of the lifting oil cylinder moves downwards relative to the piston rod of the lifting oil cylinder instantly, the volume of the hydraulic oil flowing out of the rod cavity is less than that of the hydraulic oil required by the rodless cavity, and the rodless cavity can form vacuum to cause cavitation.
In addition, when the hydraulic distributor is in a neutral working mode, the force of the farm tool acting on the lifting oil cylinder forms high pressure on hydraulic oil, the high pressure is transmitted to the hydraulic distributor, and the farm tool is caused to settle through the leakage of a gap between a valve body and a valve rod in the hydraulic distributor.
SUMMERY OF THE UTILITY MODEL
The above-mentioned not enough to prior art, the utility model provides a hydraulic suspension device's intelligence control system, this control system not only make hydraulic pressure distributor's valve rod required drive power when axial motion little, response speed is fast, can realize moreover that the agricultural implement rises, the adjustable of slew velocity.
In order to solve the technical problem, the utility model discloses a technical scheme is:
an intelligent control system for a hydraulic suspension device, comprising: the hydraulic distributor comprises a valve body and a valve rod arranged in the valve body, the valve body is provided with a first working oil cavity communicated with a first working oil port, a second working oil cavity communicated with a second working oil port, a pressure oil cavity communicated with a pressure oil port and an oil return cavity communicated with an oil return port, the first working oil port is communicated with a rodless cavity of the lifting oil cylinder through a first working oil path, the second working oil port is communicated with a rod cavity of the lifting oil cylinder through a second working oil path, the pressure oil port is communicated with a main oil path, and the oil return port is communicated with an oil tank; the hydraulic distributor is provided with a neutral working position, an ascending working position, a descending working position and a floating working position; the valve rod is provided with a plurality of valve rod sections for controlling the communication or disconnection of the corresponding oil cavities, one end of the valve rod is connected with a hydraulic push rod, and the other end of the valve rod is provided with a return spring; the energy storage oil way comprises an energy accumulator, the energy accumulator is communicated with the first working oil way through a first one-way valve, the energy accumulator is communicated with the second working oil way through a second one-way valve, and the energy accumulator is communicated with the main oil way through a third one-way valve; the hydraulic push rod is communicated with the energy storage oil way through an oil charging electromagnetic valve, the hydraulic push rod returns oil and releases pressure through an oil discharging electromagnetic valve, and the oil charging electromagnetic valve and the oil discharging electromagnetic valve are respectively and electrically connected with an electric control unit; the force sensor is used for detecting tension information borne by the lower pull rod or the upper pull rod; a lifter position sensor for detecting position information of the lifter; the valve rod displacement sensor is used for detecting displacement information of a valve rod of the hydraulic distributor; the force sensor, the lifter position sensor and the valve rod displacement sensor are respectively electrically connected with the electric control unit; two adjacent valve rod sections of the valve rod are respectively provided with a rising speed control conical surface and a falling speed control conical surface; when the hydraulic distributor is in a neutral working position, the pressure oil cavity is communicated with the oil return cavity, the first working oil cavity is closed, and the second working oil cavity is closed; when the hydraulic distributor is in a rising working position, the pressure oil cavity is disconnected and communicated with the oil return cavity, the valve rod forms a rising speed throttling gap with the valve body at the position of the rising speed control conical surface, the first working oil cavity is communicated with the pressure oil cavity through the rising speed throttling gap, and the second working oil cavity is communicated with the oil return cavity; when the hydraulic distributor is at a descending working position, the pressure oil cavity is disconnected and communicated with the oil return cavity, the valve rod forms a descending speed throttling gap with the valve body at the descending speed control conical surface, the first working oil cavity is communicated with the oil return cavity through the descending speed throttling gap, and the second working oil cavity is communicated with the pressure oil cavity; when the hydraulic distributor is in a floating working position, the pressure oil cavity, the first working oil cavity and the second working oil cavity are respectively communicated with the oil return cavity.
The hydraulic distributor is provided with a neutral pressurizing working position, when the hydraulic distributor is located at the neutral pressurizing working position, the pressure oil cavity is disconnected and communicated with the oil return cavity, the first working oil cavity is closed, and the second working oil cavity is closed.
The hydraulic distributor is provided with a floating pressurizing working position, when the hydraulic distributor is located at the floating pressurizing working position, the pressure oil cavity is disconnected and communicated with the oil return cavity, the first working oil cavity is communicated with the oil return cavity, and the second working oil cavity is communicated with the oil return cavity.
A first overflow pressure maintaining branch oil way for performing overflow pressure maintaining on a rodless cavity of the lifting oil cylinder and a second overflow pressure maintaining branch oil way for performing overflow pressure maintaining on a rod cavity of the lifting oil cylinder are arranged between the first working oil way and the second working oil way; the first overflow pressure-maintaining branch oil path comprises a first overflow pressure-maintaining valve, and the opening pressure of the first overflow pressure-maintaining valve is not less than the pressure of the articulated farm tool on the first working oil port when the electric control hydraulic valve is in a neutral state; and the second overflow pressure-maintaining branch oil way comprises a second overflow pressure-maintaining valve.
One valve rod section of the valve rod is provided with a throttling step surface; the hydraulic distributor is provided with a damping working position, when the hydraulic distributor is located at the damping working position, the throttling step surface and the corresponding inner hole of the valve body form a throttling gap which enables the second working oil cavity to be communicated with the oil return cavity, the pressure oil cavity is communicated with the oil return cavity, and the first working oil cavity is closed.
The first working oil way is provided with a stop valve, the stop valve comprises a valve sleeve, a valve core, a return spring and a gland device, the valve sleeve comprises a first valve sleeve and a second valve sleeve which are axially arranged and fixedly connected together, and the return spring is positioned in the second valve sleeve and is clamped between the gland device and the valve core; the first valve sleeve is provided with a first cavity and a first oil port communicated with the first cavity, and the second valve sleeve is provided with a second cavity and a second oil port communicated with the second cavity; the first oil port is communicated with a first working oil port of the hydraulic distributor, and the second oil port is communicated with a rodless cavity of the lifting oil cylinder; of course, a first oil port can be arranged to be communicated with the rodless cavity of the lifting oil cylinder, and a second oil port can be communicated with a second working oil port of the hydraulic distributor; the valve core comprises a first valve core section and a second valve core section which have the same outer diameter, an annular groove is formed between the first valve core section and the second valve core section, the annular groove corresponds to the position of the first cavity, the first valve core section is in sliding fit with the first valve sleeve, the second valve core section is in sliding fit with the second valve sleeve, a flange is arranged at the position, close to the annular groove, of the second valve core section, a valve core sealing conical surface is arranged on the flange, a valve sleeve sealing conical surface is arranged at the end part of the first valve sleeve, the conical degrees of the valve core sealing conical surface and the valve sleeve sealing conical surface are different, and under the action of the return spring, the first cavity is disconnected from the second cavity when the valve core sealing conical surface abuts against the inner edge of the valve sleeve sealing conical surface; the valve core is connected with a linear actuating mechanism through a connecting device, the linear actuating mechanism is electrically connected with the electric control unit, and the linear actuating mechanism drives the valve core to move when being electrified, so that the valve core sealing conical surface is separated from the valve sleeve sealing conical surface, and the first cavity is communicated with the second cavity.
Or the free end of the first valve sleeve is opened to form a hydraulic control port, the hydraulic control port is communicated with the main oil way, and the preset elastic force of the return spring is greater than the thrust of the oil pressure of the main oil way to the valve core when the main oil way is in a pressure relief state but less than the thrust of the oil pressure of the main oil way to the valve core when the main oil way is in a high-pressure state.
The connecting device comprises a pull rod and a pull rod sleeve, the pull rod extends into the second valve sleeve from the gland device and is fixedly connected with the valve core, the pull rod sleeve is connected with the pull rod in a sliding mode, the pull rod sleeve is connected with a moving shaft of the linear actuating mechanism, and the linear actuating mechanism drives the pull rod sleeve to further drive the pull rod to move axially.
Wherein, the oil filling electromagnetic valve and the oil discharging electromagnetic valve are respectively a normally closed two-position two-way electromagnetic valve.
After the technical scheme is adopted, the utility model discloses the technological effect who reaches is:
1) because two adjacent valve rod sections of the valve rod are respectively provided with a rising speed control conical surface and a falling speed control conical surface, when the hydraulic distributor is in a rising working position, a pressure oil cavity of the hydraulic distributor is disconnected and communicated with an oil return cavity, a rising speed throttling gap is formed between the valve rod and the valve body at the rising speed control conical surface, the first working oil cavity is communicated with the pressure oil cavity through the rising speed throttling gap, the second working oil cavity is communicated with the oil return cavity, and the throttling area of the rising speed throttling gap can be changed by controlling the axial displacement of the valve rod through an electric control unit, so that the rising speed of the agricultural implement can be controlled; similarly, when the hydraulic distributor is at a descending working position, the pressure oil cavity of the hydraulic distributor is disconnected and communicated with the oil return cavity, the valve rod forms a descending speed throttling gap with the valve body at the descending speed control conical surface, the first working oil cavity is communicated with the oil return cavity through the descending speed throttling gap, the second working oil cavity is communicated with the pressure oil cavity, and the axial displacement of the valve rod is controlled through the electric control unit, so that the throttling area of the descending speed throttling gap can be changed, and the descending speed of the farm implement can be controlled.
Meanwhile, because the utility model discloses an energy storage oil circuit, the energy storage ware of energy storage oil circuit through first check valve with first working oil circuit intercommunication, the energy storage ware through second check valve with the second working oil circuit intercommunication, the energy storage ware through third check valve with the main oil circuit intercommunication; the hydraulic push rod is communicated with the energy storage oil way through an oil charging electromagnetic valve, the hydraulic push rod returns oil and releases pressure through an oil discharging electromagnetic valve, and the oil charging electromagnetic valve and the oil discharging electromagnetic valve are respectively electrically connected with the electric control unit, so that the energy accumulator can be charged with pressure when the hydraulic distributor is at a rising working position, a falling working position and a middle working position, namely, when the farm implement is at the rising state, the falling state and the middle state. When the oil charging electromagnetic valve is electrified and opened, high-pressure oil in the energy accumulator pushes the hydraulic push rod, the valve rod of the hydraulic distributor moves leftwards (shown in the attached drawing), and when the oil discharging electromagnetic valve is electrified and opened, hydraulic oil of the hydraulic push rod is decompressed, and the valve rod of the hydraulic distributor moves rightwards (shown in the attached drawing) under the action of the return spring. The electric control unit detects the stress information of the lower pull rod or the upper pull rod through the force sensor, detects the position information of the lifter through the lifter position sensor, controls the movement of the valve rod of the hydraulic distributor by controlling the on and off of the oil filling electromagnetic valve and the oil discharging electromagnetic valve, and feeds back the position information of the valve rod through the valve rod displacement sensor, so that the ascending, descending, centering and floating functions of the farm implement are realized. Therefore, the driving force required by the axial movement of the valve rod of the hydraulic distributor is small, and the response speed is high.
2) Because the first working oil way is provided with the stop valve, the stop valve is closed under the elastic force action of the return spring in a neutral state, the connection between the rodless cavity of the lifting oil cylinder and the hydraulic distributor is cut off, and the agricultural implement settlement caused by the leakage of the hydraulic distributor is avoided.
Because the valve core of the stop valve of the utility model comprises a first valve core section and a second valve core section with the same outer diameter, an annular groove is arranged between the first valve core section and the second valve core section, the annular groove corresponds to the first cavity position of the first valve sleeve, the first valve core section is in sliding fit with the first valve sleeve, the second valve core section is in sliding fit with the second valve sleeve, the second valve core sleeve is provided with a flange near the annular groove, the flange is provided with a valve core sealing conical surface, the end part of the first valve sleeve is provided with a valve sleeve sealing conical surface, the conical degrees of the valve core sealing conical surface and the valve sleeve sealing conical surface are different, under the elastic action of the return spring, when the valve core sealing conical surface is propped against the inner edge of the valve sleeve sealing conical surface, hydraulic oil can be filled in the inner edge of the valve sleeve sealing conical surface, so that the first cavity is disconnected and communicated with the second cavity, because the outer diameters of the first valve core section and the second valve core section are the same and the inner diameters of the first valve sleeve and the second valve sleeve are also the same, the acting force of the hydraulic oil on the valve core is zero in the first cavity, and the acting force of the hydraulic oil on the valve core is also zero in the second cavity, so that the valve is opened only by overcoming the elastic force of the return spring, the valve is completely free from the influence of the hydraulic oil flowing through the valve, the operation is more sensitive, and the use is more reliable.
3) When the hydraulic distributor is in a damping working position during transition operation, because a valve rod section of a valve rod of the hydraulic distributor is provided with a throttling step surface, the throttling step surface and a corresponding inner hole of the valve body form a throttling gap which enables the second working oil cavity to be communicated with the oil return cavity, the pressure oil cavity is communicated with the oil return cavity, the first working oil cavity is closed, the effective cross-sectional areas of a rod cavity and a rodless cavity of the lifting oil cylinder are different, when a cylinder body of the lifting oil cylinder instantly moves upwards relative to the piston rod, the volume of hydraulic oil flowing out of the rodless cavity is more than that of the hydraulic oil required by the rod cavity, and the excessive hydraulic oil can flow to the oil return cavity from the rod cavity through the throttling gap; similarly, when the cylinder body of the lifting oil cylinder is instantly downward relative to the piston rod of the lifting oil cylinder, the volume of the hydraulic oil flowing out of the rod cavity is not enough to fill the space vacated by the rodless cavity, so that suction force can be generated, and the rodless cavity can absorb oil from the oil return cavity through the throttling gap, so that cavitation is avoided.
4) Under the conditions of a floating state and a neutral state, but the farm tool falls on the ground for a long time, a stop state and the like, the accumulator can not be charged, the pressure in the accumulator can be low or even zero, and at the moment, the electric control unit can only control the valve rod to move rightwards (shown in the attached drawing) but can not control the valve rod to move leftwards. In order to reach under these special operating mode also can control hydraulic pressure distributor valve rod two-way movement's purpose, the utility model discloses set up neutral pressure work position and the unsteady pressure work position that pressurizes at hydraulic pressure distributor, control unit issues control command, open oil charge solenoid valve control valve rod and move left, last certain time (for example 0.5 second) detect the valve rod displacement through position sensor, if do not move left, then judge accumulator insufficient pressure, then control the oil drain solenoid valve and open, under return spring's effect, it moves right neutral pressure work position or unsteady pressure work position to push away the valve rod earlier, for the accumulator back of pressurizing, the left side of control valve rod moves again.
Drawings
Fig. 1 is a hydraulic schematic diagram of an embodiment of an intelligent control system of a hydraulic suspension apparatus of the present invention;
FIG. 2 is a longitudinal cross-sectional view of the hydraulic distributor of FIG. 1 in a raised operating position;
FIG. 3 is a longitudinal cross-sectional view of the hydraulic distributor of FIG. 1 in a shock absorbing operating position;
FIG. 4 is a longitudinal cross-sectional view of the hydraulic distributor of FIG. 1 in a neutral operating position;
FIG. 5 is a longitudinal cross-sectional view of the hydraulic distributor of FIG. 1 in a neutral charge operating position;
FIG. 6 is a longitudinal cross-sectional view of the hydraulic distributor of FIG. 1 in a lowered operating position;
FIG. 7 is a longitudinal cross-sectional view of the hydraulic distributor of FIG. 1 in a floating operating position;
FIG. 8 is a longitudinal cross-sectional view of the hydraulic distributor of FIG. 1 in a floating charge operating position;
FIG. 9 is a longitudinal cross-sectional view of the valve stem of FIGS. 2-8;
FIG. 10 is a longitudinal cross-sectional view of the shut-off valve of FIG. 1;
FIG. 11 is an enlarged view of a portion of FIG. 10 at I;
FIG. 12 is a longitudinal cross-sectional view of the valve cartridge of FIG. 10;
in the figure:
001-main oil path, 10-stop valve, 101-first valve sleeve, 1011-valve sleeve sealing conical surface, 101A-first cavity, 101A-first oil port, 102-second valve sleeve, 102B-second cavity, 102B-second oil port, 103-gland device, 104-return spring, 105-valve core, 1051-first valve core section, 1052-second valve core section, 1053-flange, 1053A-valve core sealing conical surface, 1054-annular groove, 106-pull rod, 107-pull rod sleeve, 108-linear actuator; d-outer diameter, alpha-angle difference between the valve core sealing conical surface and the valve core sealing conical surface;
20-lifting oil cylinder, 21-first overflow pressure retaining valve, 22-second overflow pressure retaining valve, 30-hydraulic distributor, 301-valve body, 302-valve rod, 302A-rising speed control conical surface, 302B-falling speed control conical surface, 302C-throttling step surface, 31-return spring, 32-hydraulic push rod, 41-valve rod displacement sensor, 42-force sensor, 43-lifter position sensor, 44-radar speed sensor, 45-rotating speed sensor, 50-first one-way valve, 60-second one-way valve, 71-oil filling electromagnetic valve, 72-oil discharging electromagnetic valve, 80-energy accumulator and 90-third one-way valve;
a-a first working oil port, B-a second working oil port, a P-pressure oil port and a T-oil return port;
a-a first working oil chamber, b-a second working oil chamber, a p-pressure oil chamber, a t-oil return chamber and an m-throttling gap.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in fig. 1, an intelligent control system for a hydraulic suspension device can intelligently control the hydraulic suspension device of a tractor, and can also intelligently control the hydraulic suspension devices of other agricultural equipment.
Referring to fig. 2, the hydraulic distributor 30 includes a valve body 301 and a valve rod 302 disposed in the valve body 301, wherein the valve body 301 is provided with a first working oil chamber a communicated with a first working oil port a, a second working oil chamber B communicated with a second working oil port B, a pressure oil chamber P communicated with the pressure oil port P, and an oil return chamber T communicated with an oil return port T.
As shown in fig. 1, the first working oil port a is communicated with a rodless cavity of the lift cylinder 20 through a first working oil path, the second working oil port B is communicated with a rod cavity of the lift cylinder 20 through a second working oil path, the pressure oil port P is communicated with the main oil path 001, and the oil return port T is communicated with an oil tank. One end of the valve rod 302 is connected with a hydraulic push rod 32, and the other end is provided with a return spring 31.
As shown in fig. 9, the valve rod 302 is provided with a plurality of valve rod segments for controlling the communication or disconnection of the corresponding oil chambers, wherein two adjacent valve rod segments are respectively provided with an ascending speed control conical surface 302A and a descending speed control conical surface 302B, and the two conical surfaces are matched with the valve body 301 for controlling the ascending speed and the descending speed of the farm implement. The other valve rod section of the valve rod is provided with a throttling step surface 302C, the throttling step surface 302C and a corresponding inner hole of the valve body 301 form a throttling gap which enables the second working oil cavity b to be communicated with the oil return cavity t, and the throttling gap is used for compensating the difference of the volumes of a rod cavity and a rodless cavity of the lifting oil cylinder in a damping working mode. These two structures are the two key points of the present invention, and will be described in detail below.
As shown in fig. 1, in order to drive the valve rod 302 of the hydraulic distributor 30 by hydraulic pressure, the intelligent control system of the present invention is provided with an energy storage oil path, wherein the energy storage oil path comprises an energy accumulator 80, the energy accumulator 80 is communicated with the first working oil path through a first check valve 50, the energy accumulator 80 is communicated with the second working oil path through a second check valve 60, and the energy accumulator 80 is communicated with the main oil path 001 through a third check valve 90; the hydraulic push rod 32 is communicated with the energy storage oil way through an oil filling electromagnetic valve 71, the hydraulic push rod 32 returns oil and releases pressure through an oil discharging electromagnetic valve 72, the oil filling electromagnetic valve 71 and the oil discharging electromagnetic valve 72 are respectively and electrically connected with an electric control unit, and the oil filling electromagnetic valve 71 and the oil discharging electromagnetic valve 72 are preferably normally closed two-position two-way electromagnetic valves.
As shown in fig. 1, the force sensor 42 is used for detecting the tensile force information borne by the lower pull rod or the upper pull rod; the lifter position sensor 43 is used to detect position information of the lifter; the valve rod displacement sensor 41 is used for detecting displacement information of a valve rod of the hydraulic distributor; the force sensor 42, the lifter position sensor 43 and the valve rod displacement sensor 41 are electrically connected to the electronic control unit, respectively. The present embodiment is also provided with a radar speed sensor 44 and a revolution speed sensor 45.
In order to adapt to the active shock absorption of hanging agricultural equipment in the transition operation, the utility model discloses shock mitigation system has still been set up. As shown in fig. 1, a first overflow pressure maintaining branch oil path for performing overflow pressure maintaining on a rodless cavity of the lift cylinder 20 and a second overflow pressure maintaining branch oil path for performing overflow pressure maintaining on a rod cavity of the lift cylinder 20 are provided between the first working oil path and the second working oil path; the first overflow pressure-maintaining branch oil passage comprises a first overflow pressure-maintaining valve 21, and the opening pressure of the first overflow pressure-maintaining valve 21 is not less than the pressure of the hitching farm implement to the first working oil port a when the hydraulic distributor 30 is in a neutral state; the second overflow pressure-maintaining branch oil path includes a second overflow pressure-maintaining valve 22. The working principle of active shock absorption is disclosed in chinese patent CN111520367A, and is not described herein.
As shown in fig. 3, during transition operation, the hydraulic distributor 30 is located at a damping working position, one valve rod section of the valve rod 302 of the hydraulic distributor is provided with a throttling step surface 302C, the throttling step surface 302C and a corresponding inner hole of the valve body 301 form a throttling gap m which enables the second working oil chamber b to be communicated with the oil return chamber t, the pressure oil chamber p is communicated with the oil return chamber t, and the first working oil chamber a is closed. Because the effective cross-sectional areas of the rod cavity and the rodless cavity of the lift cylinder 20 are different, when the cylinder body of the lift cylinder 20 moves upward relative to the piston rod instantaneously, the volume of hydraulic oil flowing out of the rodless cavity is more than that of the hydraulic oil needed by the rod cavity, and the excessive hydraulic oil flows to the oil return cavity t from the rod cavity through the throttling gap m; similarly, when the cylinder body of the lift cylinder 20 moves downward relative to the piston rod of the lift cylinder instantaneously, the volume of the hydraulic oil flowing out of the rod cavity is not enough to fill the empty space of the rodless cavity, so that suction force can be generated, and the rodless cavity can absorb oil from the oil return cavity t through the throttling gap, thereby avoiding cavitation.
As shown in fig. 1 and fig. 10, 11, and 12, a shutoff valve 10 is provided in the first hydraulic fluid passage in order to prevent oil leakage from the hydraulic distributor 30 in the neutral state.
The shutoff valve 10 comprises a valve sleeve, a valve core 105, a return spring 104 and a gland device 103, wherein the valve sleeve comprises a first valve sleeve 101 and a second valve sleeve 102 which are axially arranged and fixedly connected together, and the return spring 104 is positioned in the second valve sleeve 102 and is clamped between the gland device 103 and the valve core 105.
The first valve housing 101 is provided with a first cavity 101A and a first oil port 101A communicated with the first cavity 101A, the second valve housing 102 is provided with a second cavity 102B and a second oil port 102B communicated with the second cavity 102B, the first oil port is communicated with a first working oil port a of the hydraulic distributor, the second oil port 102B is communicated with a rodless cavity of the lift cylinder 20, and the two can be exchanged, that is: the first port 101A is communicated with a rodless cavity of the lift cylinder, and the second port 102B is communicated with a first working port a of the hydraulic distributor. The spool 105 includes a first spool section 1051 and a second spool section 1052 having the same outer diameter d, an annular groove 1054 is provided between the first spool section 1051 and the second spool section 1052, the annular groove 1054 corresponds in position to the first chamber 101a, the first spool section 1051 is in sliding engagement with the first valve housing 101, the second spool section 1052 is in sliding engagement with the second valve sleeve 102, the second spool section 1052 is provided with a flange 1053 adjacent the annular groove, the flange 1053 is provided with a valve core sealing tapered surface 1053A, the end of the first valve housing 101 is provided with a valve housing sealing tapered surface 1011, the taper of the valve core sealing conical surface 1053A and the taper of the valve sleeve sealing conical surface 1011 are different and have an angle difference alpha, under the action of the return spring 104, when the valve core sealing conical surface 1053A abuts against the inner edge of the valve sleeve sealing conical surface 1011, the first chamber 101a is disconnected from the second chamber 102 b.
The valve core 105 is connected with a linear actuator 108 through a connecting device, the linear actuator 108 is electrically connected with the electronic control unit, and when the linear actuator 108 is powered on, the linear actuator 108 drives the valve core 105 to move, so that the valve core sealing conical surface 1053A is separated from the valve sleeve sealing conical surface 1011, and the first cavity 101a is communicated with the second cavity 102 b. The connecting device comprises a pull rod 106 and a pull rod sleeve 107, the pull rod 106 extends into the second valve sleeve 102 from the gland device 103 and is fixedly connected with the valve core 105, the pull rod sleeve 107 is connected with the pull rod 106 in a sliding mode, the pull rod sleeve 107 is connected with a moving shaft of the linear actuator 108, and the linear actuator 108 drives the pull rod sleeve 107 to further drive the pull rod 106 to move axially. The linear actuator 108 may be a linear motor or an electromagnet.
The free end of the first valve housing 101 is open to be a hydraulic control port, the hydraulic control port is communicated with the main oil path 001, and the preset elastic force of the return spring 104 is greater than the thrust of the oil pressure of the main oil path 001 in a pressure relief state to the valve element 105 but less than the thrust of the oil pressure of the main oil path 001 in a high pressure state to the valve element 105, that is: when the main oil path 001 is in a high pressure state, the hydraulic oil pushes the spool 105 open. When the hydraulic distribution valve is in the ascending mode and the descending mode, the shutoff valve 10 is opened to be in the communication state.
The stop valve 10 is a normally closed stop valve, and in a neutral state, the stop valve 10 is closed under the elastic force of a return spring, so that the connection between the rodless cavity of the lifting oil cylinder 20 and the hydraulic distributor 30 is cut off, the agricultural implement settlement caused by leakage of the hydraulic distributor is avoided, and the static settlement requirement of the agricultural implement is met.
The taper of the valve core sealing conical surface 1053A and the taper of the valve sleeve sealing conical surface 1011 are different, under the action of the return spring 104, when the valve core sealing conical surface 1053A leans against the inner edge of the valve sleeve sealing conical surface 1011, hydraulic oil can fill the inner edge of the valve sleeve sealing conical surface, so that the first cavity 101a is disconnected from the second cavity 102b, because the outer diameter d of the first valve core section 1051 and the second valve core section 1052 is the same, the first valve core section 1051 is in sliding fit with the first valve sleeve 101, the second valve core section 1052 is in interactive fit with the second valve sleeve 102, the outer diameter d of the first valve core section 1051 is the same as the inner diameter of the first valve sleeve 101, the outer diameter d of the second valve core section 1052 is also the same as the inner diameter of the second valve sleeve 102, therefore, in the first cavity 101a, the acting force of the valve core 105 is zero, and in the second cavity 102b, the acting force of the valve core 105 is zero, therefore, the valve is opened only by overcoming the elastic force of the return spring, and the valve is completely not influenced by the hydraulic oil flowing through the valve, so that the operation is more sensitive and the use is more reliable.
The present embodiment uses the combination of the electric control mode and the hydraulic control mode for controlling the stop valve 10, the opening force provided by the hydraulic control mode is large, the operation is convenient and energy-saving, but the electric control mode is not affected by the oil pressure of the main oil path and can be used at any time, and particularly, when the floating state hydraulic control mode cannot be performed, the electric control mode is not replaceable. Of course, if the problem of power consumption is not considered, only the electric control mode can be adopted.
In this embodiment, the hydraulic distributor is provided with a neutral working position, a neutral pressurizing working position, a rising working position, a falling working position, a floating pressurizing working position and a damping working position. Fig. 2 to 8 sequentially show the matching relationship of the components of each working position.
As shown in fig. 2, when the hydraulic distributor 30 is in the ascending operating position, the pressure oil chamber p is disconnected from the oil return chamber t, the valve rod forms an ascending speed throttling gap with the valve body at the ascending speed control conical surface, the first operating oil chamber a is communicated with the pressure oil chamber p through the ascending speed throttling gap, and the second operating oil chamber b is communicated with the oil return chamber t. The cut-off valve 10 is opened under the action of high-pressure oil in the main oil way 001. High-pressure oil in a rodless cavity of the lifting oil cylinder and high-pressure oil in a main oil way 001 charge the energy accumulator 80 simultaneously. The electric control unit controls the axial displacement of the valve rod 302, and can control the rising speed of the farm implement.
As shown in fig. 3, when the hydraulic distributor is located at the damping working position, the throttling step surface and the corresponding inner hole of the valve body form a throttling gap m which enables the second working oil chamber b to be communicated with the oil return chamber t, the pressure oil chamber p is communicated with the oil return chamber t, and the first working oil chamber a is closed.
As shown in fig. 4, when the hydraulic pressure distributor 30 is in the neutral operating position, the pressure oil chamber p communicates with the oil return chamber t, the first working oil chamber a is closed, and the second working oil chamber b is closed. The stop valve 10 is closed, and the high-pressure oil in the rodless cavity of the lifting oil cylinder charges the energy accumulator.
As shown in fig. 5, when the hydraulic pressure distributor 30 is in the neutral charge pressure operating position, the pressure oil chamber p is disconnected from the oil return chamber t, the first working oil chamber a is closed, and the second working oil chamber b is closed. The main passage 001 charges the accumulator 80 through the check valve 90.
As shown in fig. 6, when the hydraulic distributor 30 is in the descending operating position, the pressure oil chamber p is disconnected from the oil return chamber t, the valve rod forms a descending speed throttling gap with the valve body at the descending speed control conical surface, the first working oil chamber a is communicated with the oil return chamber t through the descending speed throttling gap, and the second working oil chamber b is communicated with the pressure oil chamber p. The cut-off valve 10 is opened under the action of high-pressure oil in the main oil way 001. The rod cavity high pressure oil of the lift cylinder and the main oil path 001 high pressure oil charge the accumulator 80 simultaneously. The electric control unit controls the axial displacement of the valve rod 302, and can control the descending speed of the farm tool.
As shown in fig. 7, when the hydraulic pressure distributor 30 is in the floating operation position, the pressure oil chamber p, the first working oil chamber a, and the second working oil chamber b communicate with the oil return chamber t, respectively. When the hydraulic oil in the main oil path 001 is low-pressure, the electric control unit controls the linear actuator 108 to move upwards (in the direction shown in the figure), and the valve core 105 of the stop valve is pushed to open against the spring force of the return spring 104.
As shown in fig. 8, when the hydraulic distributor is in the floating pressurizing working position, the pressure oil chamber p is disconnected from the oil return chamber t, the first working oil chamber a is communicated with the oil return chamber t, and the second working oil chamber b is communicated with the oil return chamber t. The main passage 001 charges the accumulator 80 through the check valve 90.
In the utility model, when the hydraulic distributor is at the ascending working position, the pressure oil chamber p of the hydraulic distributor 30 is disconnected and communicated with the oil return chamber t, the valve rod 302 is at the ascending speed control conical surface 302A and forms an ascending speed throttling gap with the valve body 301, the first working oil chamber a is communicated with the pressure oil chamber p through the ascending speed throttling gap, the second working oil chamber b is communicated with the oil return chamber t, and the throttling area of the ascending speed throttling gap can be changed through the axial displacement of the electric control unit control valve rod 302, so that the ascending speed of the farm tool can be controlled; similarly, when the hydraulic distributor 30 is at the descending working position, the pressure oil chamber p of the hydraulic distributor is disconnected from the oil return chamber t, the valve rod 302 forms a descending speed throttling gap with the valve body at the descending speed control conical surface 302B, the first working oil chamber a is communicated with the oil return chamber t through the descending speed throttling gap, the second working oil chamber B is communicated with the pressure oil chamber p, and the axial displacement of the valve rod 302 is controlled by the electric control unit, so that the throttling area of the descending speed throttling gap can be changed, and the descending speed of the agricultural implement can be controlled.
The utility model discloses in, when hydraulic pressure distributor 30 is in rising work position, decline work position and meso position work position, also can all pressurize energy storage 80 when the agricultural implement is in rising state, decline state and meso position state promptly. When the oil-filling electromagnetic valve 71 is electrified and opened, high-pressure oil in the energy accumulator 80 pushes the hydraulic push rod 32, the hydraulic distributor valve rod 302 moves towards the left figure, when the oil-discharging electromagnetic valve 72 is electrified and opened, hydraulic oil in the hydraulic push rod 32 is decompressed, and under the action of the return spring 31, the hydraulic distributor valve rod 302 moves towards the right figure. The electric control unit detects the stress information of the lower pull rod or the upper pull rod through the force sensor, detects the position information of the lifter through the lifter position sensor, controls the movement of the valve rod of the hydraulic distributor by controlling the on and off of the oil filling electromagnetic valve and the oil discharging electromagnetic valve, and feeds back the position information of the valve rod through the valve rod displacement sensor, so that the ascending, descending, centering and floating functions of the farm implement are realized. Therefore, the driving force required by the axial movement of the valve rod of the hydraulic distributor is small, and the response speed is high.
The utility model discloses in, but the agricultural implement of floating state, neutral state falls to ground for a long time, under the circumstances such as shut down state, can not pressurize for energy storage ware 80, can cause energy storage ware 80 internal pressure very low or even be zero, at this moment, the automatically controlled unit can only control the valve rod and move to the right shown in the figure, and can not control the valve rod and move left. In order to reach under these special operating mode also can control hydraulic pressure distributor valve rod 302 two way movement's purpose, the utility model discloses set up well neutral pressure work position and the unsteady pressure work position that pressurizes at hydraulic pressure distributor 30, control unit issues control command, open oil charge solenoid valve control valve rod 302 and move to the left, last a certain time for example 0.5 second through position sensor 41 detection valve rod displacement, if do not have the left side to move, then judge that the energy storage ware is deficient to press, then control oil drain solenoid valve opens, under return spring 31's effect, push earlier the valve rod right side move to well neutral pressure work position or unsteady pressure work position, for the energy storage ware back of pressurizing, the left side of control valve rod moves again.
The present invention is not limited to the above embodiments, and all improvements based on the concept, principle, structure and method of the present invention will fall within the protection scope of the present invention.
Claims (10)
1. An intelligent control system for a hydraulic suspension device, comprising:
the hydraulic distributor comprises a valve body and a valve rod arranged in the valve body, the valve body is provided with a first working oil cavity (a) communicated with a first working oil port (A), a second working oil cavity (B) communicated with a second working oil port (B), a pressure oil cavity (P) communicated with a pressure oil port (P) and an oil return cavity (T) communicated with an oil return port (T), the first working oil port (A) is communicated with a rodless cavity of the lifting oil cylinder through a first working oil way, the second working oil port (B) is communicated with a rod cavity of the lifting oil cylinder through a second working oil way, the pressure oil port (P) is communicated with a main oil way, and the oil return port (T) is communicated with an oil tank; the hydraulic distributor is provided with a neutral working position, an ascending working position, a descending working position and a floating working position;
the valve rod is provided with a plurality of valve rod sections for controlling the communication or disconnection of the corresponding oil cavities, one end of the valve rod is connected with a hydraulic push rod, and the other end of the valve rod is provided with a return spring;
the energy storage oil way comprises an energy accumulator, the energy accumulator is communicated with the first working oil way through a first one-way valve, the energy accumulator is communicated with the second working oil way through a second one-way valve, and the energy accumulator is communicated with the main oil way through a third one-way valve; the hydraulic push rod is communicated with the energy storage oil way through an oil charging electromagnetic valve, the hydraulic push rod returns oil and releases pressure through an oil discharging electromagnetic valve, and the oil charging electromagnetic valve and the oil discharging electromagnetic valve are respectively and electrically connected with an electric control unit;
the force sensor is used for detecting tension information borne by the lower pull rod or the upper pull rod; a lifter position sensor for detecting position information of the lifter; the valve rod displacement sensor is used for detecting displacement information of a valve rod of the hydraulic distributor; the force sensor, the lifter position sensor and the valve rod displacement sensor are respectively electrically connected with the electric control unit; it is characterized in that the preparation method is characterized in that,
two adjacent valve rod sections of the valve rod are respectively provided with a rising speed control conical surface and a falling speed control conical surface;
when the hydraulic distributor is in a neutral working position, the pressure oil cavity (p) is communicated with the oil return cavity (t), the first working oil cavity (a) is closed, and the second working oil cavity (b) is closed;
when the hydraulic distributor is in a rising working position, the pressure oil cavity (p) is disconnected from the oil return cavity (t), the valve rod forms a rising speed throttling gap with the valve body at the position of the rising speed control conical surface, the first working oil cavity (a) is communicated with the pressure oil cavity (p) through the rising speed throttling gap, and the second working oil cavity (b) is communicated with the oil return cavity (t);
when the hydraulic distributor is at a descending working position, the pressure oil cavity (p) is disconnected and communicated with the oil return cavity (t), the valve rod forms a descending speed throttling gap with the valve body at the descending speed control conical surface, the first working oil cavity (a) is communicated with the oil return cavity (t) through the descending speed throttling gap, and the second working oil cavity (b) is communicated with the pressure oil cavity (p);
when the hydraulic distributor is in a floating working position, the pressure oil chamber (p), the first working oil chamber (a) and the second working oil chamber (b) are respectively communicated with the oil return chamber (t).
2. The intelligent control system of a hydraulic suspension device according to claim 1, wherein the hydraulic distributor is provided with a neutral charge pressure working position, and when the hydraulic distributor is in the neutral charge pressure working position, the pressure oil chamber (p) is disconnected from the oil return chamber (t), the first working oil chamber (a) is closed, and the second working oil chamber (b) is closed.
3. The intelligent control system of a hydraulic suspension device according to claim 1, wherein the hydraulic distributor is provided with a floating charge working position, and when the hydraulic distributor is in the floating charge working position, the pressure oil chamber (p) is disconnected from the return oil chamber (t), the first working oil chamber (a) is communicated with the return oil chamber (t), and the second working oil chamber (b) is communicated with the return oil chamber (t).
4. The intelligent control system of a hydraulic hitch according to claim 1, wherein a first overflow pressure-maintaining branch oil passage for performing overflow pressure maintaining on a rodless chamber of the lift cylinder and a second overflow pressure-maintaining branch oil passage for performing overflow pressure maintaining on a rod chamber of the lift cylinder are provided between the first working oil passage and the second working oil passage; the first overflow pressure-maintaining branch oil path comprises a first overflow pressure-maintaining valve, and the opening pressure of the first overflow pressure-maintaining valve is not less than the pressure of the hitching farm implement on the first working oil port (A) when the hydraulic distributor is in a neutral state; and the second overflow pressure-maintaining branch oil way comprises a second overflow pressure-maintaining valve.
5. The intelligent control system for a hydraulic suspension system as claimed in claim 4, wherein one stem segment of the valve stem is provided with a throttle step surface; the hydraulic distributor is provided with a damping working position, when the hydraulic distributor is located at the damping working position, the throttling step surface and the corresponding inner hole of the valve body form a throttling gap which enables the second working oil cavity (b) to be communicated with the oil return cavity (t), the pressure oil cavity (p) is communicated with the oil return cavity (t), and the first working oil cavity (a) is closed.
6. The intelligent control system of a hydraulic suspension device according to claim 1, wherein the first working oil passage is provided with a shutoff valve.
7. The intelligent control system for a hydraulic suspension system as recited in claim 6 wherein said shutoff valve comprises a valve housing, a valve spool, a return spring and a gland arrangement, said valve housing comprising a first valve housing and a second valve housing axially aligned and fixedly connected together, said return spring being disposed within said second valve housing and being sandwiched between said gland arrangement and said valve spool;
the first valve sleeve is provided with a first cavity and a first oil port communicated with the first cavity, and the second valve sleeve is provided with a second cavity and a second oil port communicated with the second cavity;
the first oil port is communicated with a first working oil port (A) of the hydraulic distributor, and the second oil port is communicated with a rodless cavity of the lifting oil cylinder; or
The first oil port is communicated with a rodless cavity of the lifting oil cylinder, and the second oil port is communicated with a first working oil port (A) of the hydraulic distributor;
the valve core comprises a first valve core section and a second valve core section which have the same outer diameter, an annular groove is formed between the first valve core section and the second valve core section, the annular groove corresponds to the position of the first cavity, the first valve core section is in sliding fit with the first valve sleeve, the second valve core section is in sliding fit with the second valve sleeve, a flange is arranged at the position, close to the annular groove, of the second valve core section, a valve core sealing conical surface is arranged on the flange, a valve sleeve sealing conical surface is arranged at the end part of the first valve sleeve, the conical degrees of the valve core sealing conical surface and the valve sleeve sealing conical surface are different, and under the action of the return spring, the first cavity is disconnected from the second cavity when the valve core sealing conical surface abuts against the inner edge of the valve sleeve sealing conical surface;
the valve core is connected with a linear actuating mechanism through a connecting device, the linear actuating mechanism is electrically connected with the electric control unit, and the linear actuating mechanism drives the valve core to move when being electrified, so that the valve core sealing conical surface is separated from the valve sleeve sealing conical surface, and the first cavity is communicated with the second cavity.
8. The intelligent control system for a hydraulic hitch apparatus of claim 7, wherein the free end of the first valve housing is open to a pilot port, the pilot port is in communication with the main oil passage, and the preset spring force of the return spring is greater than the thrust of the oil pressure of the main oil passage to the spool when the main oil passage is in the pressure relief state but less than the thrust of the oil pressure of the main oil passage to the spool when the main oil passage is in the high pressure state.
9. The intelligent control system for a hydraulic suspension system as recited in claim 7, wherein the linkage assembly includes a pull rod extending from the capping device into the second valve housing and fixedly coupled to the valve core, and a pull rod sleeve slidably coupled to the pull rod, the pull rod sleeve being coupled to the movable shaft of the linear actuator, the linear actuator driving the pull rod sleeve to move the pull rod axially.
10. The intelligent control system for a hydraulic suspension device according to claim 1, wherein the oil-filling solenoid valve and the oil-discharging solenoid valve are each a normally closed two-position two-way solenoid valve.
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| CN202022099228.4U CN212744561U (en) | 2020-09-22 | 2020-09-22 | Intelligent control system of hydraulic suspension device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022062277A1 (en) * | 2020-09-22 | 2022-03-31 | 博鼎精工智能科技(山东)有限公司 | Intelligent control system of hydraulic hitch device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022062277A1 (en) * | 2020-09-22 | 2022-03-31 | 博鼎精工智能科技(山东)有限公司 | Intelligent control system of hydraulic hitch device |
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