CN110645212B - Hydraulic control system and door system - Google Patents

Hydraulic control system and door system Download PDF

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Publication number
CN110645212B
CN110645212B CN201810665870.9A CN201810665870A CN110645212B CN 110645212 B CN110645212 B CN 110645212B CN 201810665870 A CN201810665870 A CN 201810665870A CN 110645212 B CN110645212 B CN 110645212B
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China
Prior art keywords
oil
cylinder
port
oil cylinder
main
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CN201810665870.9A
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CN110645212A (en
Inventor
何锡阳
聂才刚
卓圣翔
潘洪明
姜振兴
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BYD Co Ltd
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BYD Co Ltd
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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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C17/00—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/50—Power-operated mechanisms for wings using fluid-pressure actuators
    • E05F15/53—Power-operated mechanisms for wings using fluid-pressure actuators for swinging wings
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/50—Application of doors, windows, wings or fittings thereof for vehicles
    • E05Y2900/53—Type of wing
    • E05Y2900/531—Doors
    • E05Y2900/532—Back doors or end doors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention provides a hydraulic control system, which comprises an oil tank, an oil pump, a reversing valve, a main oil cylinder and an auxiliary oil cylinder, wherein the oil pump is arranged on an oil way between the reversing valve and the oil tank; the main oil cylinder and the auxiliary oil cylinder are both communicated with the reversing valve; the reversing valve comprises a left working state and a right working state, when the reversing valve is in the left position, oil is fed into a rodless cavity of the main oil cylinder, oil is discharged from a rod cavity of the main oil cylinder, and oil is discharged from a rodless cavity of the auxiliary oil cylinder; when the reversing valve is in the right position, the rodless cavity of the main oil cylinder produces oil, the rod cavity of the main oil cylinder takes oil, and the rodless cavity of the auxiliary oil cylinder takes oil. According to the stay bar control system, the main oil cylinder can drive the auxiliary oil cylinder to act, namely the main oil cylinder and the auxiliary oil cylinder act in a coordinated mode, and two different functions can be achieved. The invention also provides a door system.

Description

Hydraulic control system and door system
Technical Field
The invention relates to a hydraulic control system and a door system.
Background
The sanitation vehicle in the prior art is provided with the safety stay bar, and after the back door of the sanitation vehicle is opened in place, the safety stay bar can be manually operated to support the back door, so that the sanitation vehicle can conveniently load or dump garbage, and meanwhile, the back door is prevented from falling and closing due to the factors of failure of a control system, burst of a pipeline, accidental external force and the like, and personal and property safety loss is caused. The support rod is simple in structure, the support rod is extended and retracted through manual operation, manpower and time are wasted, and operation is inconvenient.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. To this end, a first object of the present invention is to propose an efficient hydraulic control system.
A second object of the invention is to propose a door system.
In order to achieve the above object, an embodiment of the present invention provides a hydraulic control system, including an oil tank, an oil pump, a reversing valve, a main oil cylinder and an auxiliary oil cylinder, wherein the oil pump is disposed on an oil path between the reversing valve and the oil tank; the main oil cylinder and the auxiliary oil cylinder are both communicated with the reversing valve; the reversing valve comprises a left working state and a right working state, when the reversing valve is in the left position, oil is fed into a rodless cavity of the main oil cylinder, oil is discharged from a rod cavity of the main oil cylinder, and oil is discharged from a rodless cavity of the auxiliary oil cylinder; when the reversing valve is in the right position, the rodless cavity of the main oil cylinder produces oil, the rod cavity of the main oil cylinder takes oil, and the rodless cavity of the auxiliary oil cylinder takes oil.
According to the hydraulic control system provided by the embodiment of the invention, when oil enters the rodless cavity of the main oil cylinder, the piston rod of the main oil cylinder can be extended out, and the piston rod of the auxiliary oil cylinder can be retracted; when oil is fed into the rod cavity of the main oil cylinder, the piston rod of the main oil cylinder can be retracted, the piston rod of the auxiliary oil cylinder is extended out, the main oil cylinder acts to drive the auxiliary oil cylinder to act, namely the main oil cylinder and the auxiliary oil cylinder work in a cooperative mode, and two different functions can be achieved.
According to some embodiments of the invention, the reversing valve comprises a port a, a port B, a port P and a port T, the port P being in communication with the oil pump and the port T being in communication with the oil tank; a first oil way is arranged between the rodless cavities of the auxiliary oil cylinders at the port B; a second oil way is arranged between the port A and the rodless cavity of the main oil cylinder; and a third oil way is arranged between rod cavities of the main oil cylinder at the port B.
According to some embodiments of the invention, when the reversing valve is in the left position, the port a is communicated with the port P, the second oil path is filled with oil, the rodless cavity of the master cylinder is filled with oil, the port B is communicated with the port T, the rod cavity of the master cylinder is filled with oil, the third oil path is filled with oil, the rodless cavity of the slave cylinder is filled with oil, and the first oil path is filled with oil; when the reversing valve is in the right position, the port A is communicated with the port T, the second oil way produces oil, the rodless cavity of the main oil cylinder produces oil, the port B is communicated with the port P, the rod cavity of the main oil cylinder produces oil, the third oil way produces oil, the rodless cavity of the auxiliary oil cylinder produces oil, and the first oil way produces oil.
According to some embodiments of the invention, the rod chamber of the slave cylinder is provided with a spring, and two ends of the spring are respectively fixed on the cylinder wall of the slave cylinder and the piston head of the piston rod of the slave cylinder.
According to some embodiments of the invention, a first hydraulic control check valve is arranged on the first oil path, a pilot oil path of the first hydraulic control check valve is communicated with the port a, and when the port a takes oil, the first hydraulic control check valve is conducted reversely.
According to some embodiments of the invention, an electrically controlled directional valve is provided on the first oil passage.
According to some embodiments of the invention, a manual stop valve is arranged in parallel at two ends of an oil path where the first hydraulic control one-way valve or the electric control reversing valve is located.
According to some embodiments of the invention, a second hydraulic control check valve and a third hydraulic control check valve are respectively arranged on the second oil path and the third oil path, a pilot oil path of the second hydraulic control check valve is communicated with the third oil path, and a pilot oil path of the third hydraulic control check valve is communicated with the second oil path.
According to some embodiments of the invention, the second oil passage and the third oil passage are each provided with a speed regulating valve. According to some embodiments of the invention, the master cylinder has a larger radius than the slave cylinder.
According to some embodiments of the invention, the operating state of the directional control valve further comprises a neutral position, and when the directional control valve is in the neutral position, the port a and the port B are both communicated with the port T.
According to some embodiments of the invention, the reversing valve is in a neutral position after the piston rod of the slave cylinder is extended to a maximum position.
In order to achieve the above object, in another embodiment of the present invention, a door system is provided, which includes the above hydraulic control system, the main cylinder pushes the door main body to open and pulls the door main body to close, the auxiliary cylinder pushes the stay bar to support the door main body when the door is opened, and the auxiliary cylinder pulls the stay bar to retract when the door main body is closed.
According to the door system provided by the embodiment of the invention, when the main oil cylinder pushes the door main body to open, the auxiliary oil cylinder pushes the stay bar to support the door main body, when the auxiliary oil cylinder pulls the door main body to close, the auxiliary oil cylinder pulls the stay bar to retract, the main oil cylinder and the auxiliary oil cylinder cooperate to realize automatic opening and closing of the door main body and automatic support and recovery of the stay bar, and the door system is simple and convenient to operate and high in safety.
According to some embodiments of the invention, a piston rod of the main cylinder is connected with the door main body, a piston rod of the auxiliary cylinder is connected with the stay bar, when oil enters a rod cavity of the main cylinder, the piston rod of the main cylinder pushes the door main body to open, oil enters a rod-free cavity of the auxiliary cylinder, and the auxiliary cylinder pushes the stay bar to support the door main body; when the rodless cavity of the auxiliary oil cylinder produces oil, the auxiliary oil cylinder pulls the support rod to retract, the rodless cavity of the main oil cylinder takes oil, and the piston rod of the main oil cylinder pulls the door main body to close.
According to some embodiments of the present invention, the stay is hinged to the door main body and one end of the stay is connected to a piston rod of the sub cylinder.
According to some embodiments of the invention, the door body is provided with a locking groove for locking the stay.
Drawings
FIG. 1 is a schematic diagram of a hydraulic control system of the present invention;
FIG. 2 is an operational state diagram of a door system of the present invention;
FIG. 3 is another operational state diagram of a door system of the present invention;
FIG. 4 is a state diagram of an operation of a hydraulic control system of the present invention;
fig. 5 is another operational state diagram of a hydraulic control system of the present invention.
Reference numerals:
the hydraulic control system comprises an oil tank 1, an oil pump 2, a safety valve 3, a reversing valve 4, a two-way pilot-operated check valve 5, a second hydraulic-operated check valve 51, a pilot oil path 510 of the second hydraulic-operated check valve, a third hydraulic-operated check valve 52, a pilot oil path 520 of the third hydraulic-operated check valve, a speed regulating valve 6, a first check valve 61, a first damping valve 62, a second damping valve 63, a second check valve 64, a master cylinder 7, a rod chamber 71 and a third oil path 710 of the master cylinder, a rodless chamber 72 and a second oil path 720 of the master cylinder, a slave cylinder 8, a rod chamber 81 and a piston rod 810 of the slave cylinder, a spring 811, a piston head 812, a rodless chamber 82 of the slave cylinder, a first hydraulic-operated check valve 9, a pilot oil path 91 of the first hydraulic-operated check valve, a first oil path 92, a stop valve 10, a guide groove 11, a hinge 110, a first section 111, a second section 112, a door body 12, a box body 13, a hydraulic control system 1000 and a strut 2000.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to fig. 1-5 are exemplary and intended to be illustrative of the invention and should not be construed as limiting the invention.
As shown in fig. 1, a first aspect of the present invention provides a hydraulic control system 1000, including an oil tank 1, an oil pump 2, a reversing valve 4, a main oil cylinder 7 and an auxiliary oil cylinder 8, where the oil pump 2 is disposed on an oil path between the reversing valve 4 and the oil tank 1; the main oil cylinder 7 and the auxiliary oil cylinder 8 are both communicated with the reversing valve 4; the reversing valve 4 comprises a left working state and a right working state, when the reversing valve 4 is in the left position, the rodless cavity 72 of the main oil cylinder takes oil in, the rod cavity 71 of the main oil cylinder takes oil out, and the rodless cavity 82 of the auxiliary oil cylinder takes oil out; when the reversing valve 4 is in the right position, the rodless cavity 72 of the main oil cylinder produces oil, the rod cavity 71 of the main oil cylinder produces oil, and the rodless cavity 82 of the auxiliary oil cylinder produces oil.
According to the hydraulic control system 1000 of the embodiment of the invention, when the rodless cavity of the main oil cylinder is fed with oil, the piston rod of the main oil cylinder can be extended out, and the piston rod of the auxiliary oil cylinder can be retracted; when oil is fed into the rod cavity of the main oil cylinder, the piston rod of the main oil cylinder can be retracted, the piston rod of the auxiliary oil cylinder is extended out, the main oil cylinder can drive the auxiliary oil cylinder to act, namely the main oil cylinder 7 and the auxiliary oil cylinder 8 work in a cooperative mode, and two different functions can be achieved.
Preferably, the rod chamber 82 of the slave cylinder is provided with a spring 811, and both ends of the spring 811 are fixed to the cylinder wall of the slave cylinder and the piston head of the piston rod 810 of the slave cylinder 8, respectively. If the rod cavity 71 of the main oil cylinder is filled with oil, the rodless cavity 82 of the auxiliary oil cylinder is filled with oil, the pressure required by the rodless cavity 82 of the auxiliary oil cylinder to push the piston head 812 is greater than that of the main oil cylinder 7, and after the main oil cylinder 7 acts, the hydraulic control system 1000 builds enough pressure to act; if the rodless cavity 72 of the main oil cylinder is filled with oil, the rodless cavity 82 of the auxiliary oil cylinder is filled with oil, the piston head 812 of the auxiliary oil cylinder is pushed by the compressed spring 811, the pressure applied to the piston head 812 of the auxiliary oil cylinder 8 is larger than that applied to the main oil cylinder 7, and the auxiliary oil cylinder 8 acts before the main oil cylinder 7 acts.
Preferably, the radius of the master cylinder 7 is larger than that of the slave cylinder 8. The radius of the main cylinder 7 is larger than that of the auxiliary cylinder 8, the radius of the piston head 812 of the piston rod 810 of the auxiliary cylinder 8 is small, that is, the mass of the piston head 812 is small (under the condition that the densities and heights of the piston heads of the main cylinder 7 and the auxiliary cylinder 8 are the same), although the mass of the piston head 812 is small, that is, the load force required by the hydraulic control system 1000 (the load force is the minimum power required for pushing the piston head, the same applies below) is small, because the radius of the piston head 812 is small, that is, the force bearing area is too small, the hydraulic control system 1000 needs to provide large pressure to meet the requirement of the load force, and moreover, needs to provide pressure for overcoming the pressure of the spring 811. Although the piston head of the main cylinder has a large mass, i.e., the load force required by the hydraulic control system 1000 is large, the hydraulic control system 1000 can establish the load force for moving the piston head of the main cylinder only by small pressure because the piston head of the piston rod of the main cylinder 7 has a large radius, i.e., the force-receiving area is large. Therefore, when oil enters the rod cavity of the oil cylinder 7, the smaller pressure can push the piston rod of the main oil cylinder 8 to move, the pressure at the moment is not enough to meet the requirement of the load force of the piston head 812, and the piston head of the main oil cylinder 7 acts earlier than the piston head of the auxiliary oil cylinder 8; when the piston rod of the main cylinder 7 is retracted to the bottom, the pressure of the hydraulic control system 1000 is gradually increased, that is, the provided pressure is gradually increased, until a load force pushing the piston head 812 of the auxiliary cylinder 8 to move can be established, and the piston rod 810 of the auxiliary cylinder 8 is extended.
Meanwhile, the radius of the main oil cylinder 7 is larger than that of the auxiliary oil cylinder 8, so that the time for the auxiliary oil cylinder 8 to finish the action is shorter than that of the main oil cylinder 7.
Specifically, when oil enters the rod cavity 71 of the master cylinder, the pressure required by the piston rod 810 of the auxiliary cylinder 8 is high, the master cylinder 7 acts before the auxiliary cylinder 8, and the auxiliary cylinder 8 acts after the hydraulic control system 1000 establishes sufficient pressure, so that the master cylinder 7 and the auxiliary cylinder 8 act sequentially; when oil is fed into the rodless cavity 72 of the main oil cylinder, the pressure (the pressure action of the spring 811) on the piston head 812 of the piston rod 810 of the auxiliary oil cylinder 8 is greater than that of the main oil cylinder 7, the auxiliary oil cylinder 8 acts earlier than the main oil cylinder 7, the action completion time of the auxiliary oil cylinder 8 is shorter than that of the main oil cylinder 7, and the sequential action of the main oil cylinder 7 and the auxiliary oil cylinder 8 can be realized.
According to some embodiments of the present invention, the master cylinder 7 and the slave cylinder 8 have the same radius. When oil is fed into the rod cavity 71 of the main oil cylinder, the loads of the main oil cylinder 7 and the auxiliary oil cylinder 8 are the same, the pressure to be established is the same, the auxiliary oil cylinder 8 and the main oil cylinder 7 start to act simultaneously, the action finishing time of the auxiliary oil cylinder 8 is the same as that of the main oil cylinder 7, and the simultaneous action of the main oil cylinder 7 and the auxiliary oil cylinder 8 can be realized; when the rodless cavity 72 of the main oil cylinder is filled with oil, the piston rod of the oil cylinder 7 is pushed out, the piston rod of the auxiliary oil cylinder 8 is pulled back, the main oil cylinder 7 and the auxiliary oil cylinder 8 act simultaneously, the action completion time of the auxiliary oil cylinder 8 is the same as that of the main oil cylinder 7, and the simultaneous action of the main oil cylinder 7 and the auxiliary oil cylinder 8 can be realized.
Specifically, the reversing valve 4 comprises an A port, a B port, a P port and a T port, wherein the P port is communicated with the oil pump 2, and the T port is communicated with the oil tank 1; a first oil way 92 is arranged between the rodless cavities 82 of the auxiliary oil cylinders at the port B; a second oil path 720 is arranged between the port A and the rodless cavity 72 of the main oil cylinder; and a third oil path 710 is arranged between the rod cavities 71 of the main oil cylinder with the port B. The port A, the port B, the port P and the port T are all ports of the reversing valve 4, the port B, the rodless cavity 82 of the auxiliary oil cylinder and the first oil way 92 are communicated, the port A, the rodless cavity 72 of the main oil cylinder and the second oil way 720 are communicated, and the port B, the rod cavity 71 of the main oil cylinder and the third oil way 710 are communicated. The first oil passage 92 and the third oil passage 710 are both communicated with the port B, that is, the first oil passage 92 and the third oil passage 710 are communicated. According to other embodiments of the present invention, the first oil passage 92 may communicate with the port a, and the first oil passage 92 communicates with the second oil passage 720.
Further, when the reversing valve 4 is in the left position, the port A is communicated with the port P, the second oil path 720 is filled with oil, the rodless cavity 72 of the main oil cylinder is filled with oil, the port B is communicated with the port T, the rod cavity 71 of the main oil cylinder discharges oil, the third oil path 710 discharges oil, the rodless cavity 82 of the auxiliary oil cylinder discharges oil, and the first oil path 92 discharges oil; when the reversing valve 4 is in the right position, the port A is communicated with the port T, the second oil path 720 produces oil, the rodless cavity 72 of the main oil cylinder produces oil, the port B is communicated with the port P, the rod cavity 71 of the main oil cylinder takes oil, the third oil path 710 takes oil, the rodless cavity 82 of the auxiliary oil cylinder takes oil, and the first oil path 92 takes oil.
The reversing valve 4 can be a three-position four-way valve, when the reversing valve 4 is positioned at a left position, the port A is communicated with the port P, namely the second oil path 720 is communicated with the oil pump 2, and the port B is communicated with the port T, namely the first oil path 92 and the third oil path 710 are communicated with the oil tank 1; when the reversing valve 4 is positioned at the right position, the port B is communicated with the port P, namely the first oil path 92 and the third oil path 710 are communicated with the oil pump 2, and the port A is communicated with the port T, namely the second oil path 720 is communicated with the oil tank 1; when the change valve 4 is located at the middle position, the port a and the port B are communicated with the port T, that is, the first oil passage 92, the second oil passage 720 and the third oil passage 710 are communicated with the oil tank 1.
It can be understood that when the first oil path 92 is communicated with the oil pump 2, the rodless cavity 82 of the auxiliary oil cylinder is filled with oil, and when the first oil path 92 is communicated with the oil tank 1, the rodless cavity 82 of the auxiliary oil cylinder is filled with oil; when the third oil path 710 is communicated with the oil pump 2, the rod cavity 71 of the main oil cylinder takes oil in, and when the third oil path 710 is communicated with the oil tank 1, the rod cavity 71 of the main oil cylinder takes oil out; when the second oil path 720 is communicated with the oil pump 2, the rodless cavity 72 of the master cylinder takes in oil; when the second oil passage 720 is connected to the oil tank 1, the rodless chamber 72 of the master cylinder discharges oil.
Specifically, the working state of the reversing valve 4 further includes a neutral position, and when the reversing valve 4 is in the neutral position, the port a and the port B are both communicated with the port T. The first oil path 92, the second oil path 720 and the third oil path 710 are all communicated with the oil tank 1, because the two-way pilot-controlled check valve 5 (including the second pilot-controlled check valve 51 and the third pilot-controlled check valve 52) plays a role of hydraulic lock, the main oil cylinder 7 does not flow, and because the first pilot-controlled check valve 9 is in one-way conduction, the oil liquid of the auxiliary oil cylinder 8 does not flow.
Preferably, the direction valve 4 is in the neutral position after the piston rod 810 of the slave cylinder 8 is extended to the maximum position. Due to the locking function of the two-way hydraulic control one-way valve 5 and the one-way conduction function of the first hydraulic control one-way valve 9, the main oil cylinder 7 and the auxiliary oil cylinder 8 are both kept in the existing state, namely, a piston rod of the main oil cylinder 7 and a piston rod 810 of the auxiliary oil cylinder 8 do not act. The maximum position of extension of piston rod 810 of the present embodiment is the maximum compressed position of spring 811. Optionally, a first hydraulic control check valve 9 is arranged on the first oil path, a pilot oil path of the first hydraulic control check valve is communicated with the port a, and when the pressure of the port a is greater than a set value, the first hydraulic control check valve is conducted reversely. The pilot oil path 91 of the first pilot-controlled check valve is communicated with the port a, namely, the pilot oil path is communicated with the second oil path 720, when the second oil path 720 takes oil, namely, the pressure of the second oil path 720 is increased, the pressure of the port a is increased, and when the pressure of the port a is greater than a set value, namely, the pressure of the pilot oil path 91 of the first pilot-controlled check valve is greater than the set value, the first pilot-controlled check valve 9 is conducted reversely. The pilot oil path 91 of the first pilot-controlled check valve is a pilot-controlled oil path of the first pilot-controlled check valve 9, and when the pressure of the pilot oil path 91 of the first pilot-controlled check valve exceeds a set value, the first pilot-controlled check valve 9 can be controlled to be opened reversely by the oil pressure of the second oil path 720, so that the oil flows backwards through the first pilot-controlled check valve 9. Pilot oil passage 91 of the first pilot-operated check valve may communicate with third oil passage 710, and first oil passage 92 and second oil passage 720 at this time.
Further, when the oil pressure of the pilot oil passage 91 of the first pilot-operated check valve is less than or equal to a set value, the oil flows into the sub-cylinder 8 through the third oil passage 710 and the first oil passage 92; when the oil pressure of the pilot oil passage 91 of the first pilot-operated check valve is greater than the set value, the oil of the sub-cylinder 8 flows to the third oil passage 710 through the first oil passage 92. When the oil pressure of the pilot oil path 91 of the first hydraulic control one-way valve is less than or equal to a set value, the first hydraulic control one-way valve 9 is opened in the forward direction, the oil of the third oil path 710 mainly flows through the rod cavity, and the rest oil flows into the auxiliary oil cylinder 8 through the first oil path 92; when the oil pressure of the pilot oil path 91 of the first pilot-controlled check valve is greater than the set value, the pilot oil path 91 of the first pilot-controlled check valve opens the first pilot-controlled check valve 9 in the reverse direction, and the oil of the sub-cylinder 8 flows to the third oil path 710 through the first oil path 92 and flows back to the oil tank 1 together with the oil of the third oil path 710. The pilot oil path 91 of the first pilot-controlled check valve is communicated with the second oil path 720, whether the first pilot-controlled check valve 9 is conducted reversely is determined according to the pressure when the second oil path 720 takes oil, and the set value can be determined according to the pressure when the second oil path 720 takes oil. The forward direction and the reverse direction of the first pilot-controlled check valve 9 are opposite directions. The first hydraulic control one-way valve 9 has high response speed, and the auxiliary oil cylinder 8 can rapidly act along with the main oil cylinder 7.
Optionally, an electrically controlled directional valve is provided on the first oil passage 92. The electric control reversing valve can be a two-position two-way valve, when the reversing valve 4 is in the right position and oil is fed into the rod cavity 71 of the main oil cylinder, the oil flows into the auxiliary oil cylinder 8 through the third oil path 710 of the main oil cylinder 7; when the reversing valve 4 is in the left position, oil flows into the rodless cavity 72 of the main cylinder, and the oil flows from the auxiliary cylinder 8 to the third oil path 710 of the main cylinder 7. The pressure of the rod cavity is detected through the pressure sensor, when the pressure of the rod cavity reaches a preset pressure value, the working position of the two-position two-way valve is a left position, and oil flows into the auxiliary oil cylinder 8 through the third oil way 710 of the main oil cylinder 7; when oil enters the rodless cavity 72 of the main oil cylinder, namely the pressure of the rod cavity does not reach the preset pressure value, the working position of the two-position two-way valve is the right position, and the oil flows to the third oil way 710 of the main oil cylinder 7 from the auxiliary oil cylinder 8. According to other embodiments of the present invention, the pressure sensor may detect the pressure of the rod-less chamber or both the rod-less chamber and the rod-less chamber, and determine whether the rod-less chamber or the rod-less chamber is filled with oil according to the pressure of the rod-less chamber or the rod-less chamber.
Preferably, the manual stop valve is arranged in parallel at two ends of an oil path where the first hydraulic control one-way valve or the electric control reversing valve is located. The shut-off valve 10 is an on-off valve that can be opened or closed manually. When the stop valve 10 is opened, the oil liquid of the auxiliary oil cylinder 8 can flow back to the oil tank 1 through the unloading of the stop valve 10, and when the first hydraulic control one-way valve 9 breaks down, the auxiliary oil cylinder 8 manually retracts the piston rod 810 of the auxiliary oil cylinder 8, so that the energy consumption can be reduced, and the hydraulic elements can be prevented from being damaged to a greater extent.
Preferably, a second hydraulic control check valve and a third hydraulic control check valve are respectively arranged on the third oil path 710 and the third oil path 710, a pilot oil path of the second hydraulic control check valve is communicated with the third oil path 710, and a pilot oil path of the third hydraulic control check valve is communicated with the second oil path 720. When oil enters the second oil path 720, the pilot oil path 510 of the second hydraulic control one-way valve leads the third hydraulic control one-way valve 52 of the third oil path 710 to be conducted reversely, and the third oil path 710 discharges oil; when oil enters the third oil path 710, the pilot oil path 520 of the third hydraulic control one-way valve enables the second hydraulic control one-way valve 51 to be conducted reversely, and oil is discharged from the second oil path 720; when the second oil path 720 and the third oil path 710 are both communicated with the oil tank, the pilot oil path 510 of the second hydraulic control check valve and the pilot oil path 520 of the third hydraulic control check valve do not work, and because the second hydraulic control check valve 51 and the second hydraulic control check valve 52 are communicated in a single direction, the oil in the rod chamber 71 of the master cylinder and the oil in the rodless chamber 72 of the master cylinder do not flow, that is, the oil in the second oil path 720 and the oil in the third oil path 710 do not flow. The second hydraulic control check valve 51 and the third hydraulic control check valve 52 form a two-way hydraulic control check valve 5, and the two-way hydraulic control check valve 5 can play a role of locking the oil cylinder, namely a hydraulic lock, so that oil in the rod cavity and the rodless cavity does not flow (does not flow), namely the oil in the second oil passage 720 and the third oil passage 710 does not flow (does not flow). When the vehicle loses power or is unstable, the two-way hydraulic control one-way valve 5 can relieve damage to the main oil cylinder 7.
Further, the third oil passage 710 and the third oil passage 710 are provided with speed control valves 6, respectively. The speed control valve 6 is used to adjust the speed of the third oil passage 710 or the third oil passage 710. The speed regulating valve 6 of the third oil path 710 comprises a first check valve 61 and a first damping valve 62, the first damping valve 62 is arranged on the third oil path 710, and the first check valve 61 is connected with the first damping valve 62 in parallel; the speed control valve 6 of the third oil passage 710 includes a second check valve 64 and a second damping valve 63, the second damping valve 63 is provided in the third oil passage 710, and the second check valve 64 is connected in parallel with the second damping valve 63.
Preferably, the oil pump 2 bypass is connected with the oil tank 1, the bypass is provided with the safety valve 3, and the safety valve 3 unloads the oil pump 2 when the oil pressure of the oil line is too high.
As shown in fig. 2, a second aspect of the present invention provides a door system including the hydraulic control system 1000 according to the first aspect of the present invention, the main cylinder 7 pushes the door main body 12 to open and pulls the door main body 12 to close, the sub cylinder 8 pushes the stay 2000 to support the door main body 12 when the door main body 12 is opened, and the sub cylinder 8 pulls the stay 2000 to retract when the door main body 12 is closed. The door system includes a box body 13 and a door body 12, the door body 12 is hinged to the box body 13, the door body 12 can rotate around the box body 13 when opened and closed, and the box body 13 can be closed after the door body 12 is closed. The main oil cylinder 7 is used for opening and closing the door main body 12, and the auxiliary oil cylinder 8 is used for driving the support rod 2000 to move. The stay 2000 gradually supports the door main body 12 when the master cylinder 7 starts to open the door main body 12, and the stay 2000 gradually retracts when the master cylinder 7 starts to close.
According to the door system of the invention, the stay rod 2000 can automatically support the door main body 12 when the main oil cylinder 7 opens the door main body 12, and the stay rod 2000 can be retracted when the main oil cylinder 7 closes the door main body 12, namely, the main oil cylinder 7 and the auxiliary oil cylinder 8 cooperate to realize the automatic opening and closing of the door main body 12 and the automatic supporting and retracting of the stay rod 2000, so that the door system is simple and convenient to operate and high in safety, the phenomenon that the stay rod 2000 is bent and broken due to forgetting to retract the stay rod 2000 when the door main body 12 is closed is avoided, and the phenomenon that the door main body 12 suddenly drops to cause damage to people or parts due to forgetting to start the stay rod 2000 when the door main body 12 is opened is avoided. In addition, if the hydraulic control system 1000 fails, the supporting rod 2000 can be manually operated to support and remove the support of the supporting rod 2000, so that the function of the supporting rod 2000 is always effective.
Further, a piston rod of the main oil cylinder 7 is connected with the door main body 12, a piston rod 810 of the auxiliary oil cylinder 8 is connected with the support rod 2000, when oil enters the rod cavity 71 of the main oil cylinder, the piston rod of the main oil cylinder 7 pushes the door main body 12 to be opened, oil enters the rodless cavity 82 of the auxiliary oil cylinder, and the auxiliary oil cylinder 8 pushes the support rod 2000 to support the door main body 12; when the rodless cavity 82 of the auxiliary oil cylinder produces oil, the auxiliary oil cylinder 8 pulls the support rod 2000 to retract, the rodless cavity 72 of the main oil cylinder takes oil, and the piston rod of the main oil cylinder 7 pulls the door main body 12 to close.
Optionally, the radius of the main cylinder 7 is larger than that of the auxiliary cylinder 8, and after the main cylinder 7 opens the door main body 12 to the maximum opening degree, the pressure of the hydraulic control system 1000 gradually increases so that the support rod 2000 gradually supports the door main body 12 by the auxiliary cylinder 8; the sub-cylinder 8 retracts the stay 2000 before the main cylinder 7 closes the door main body 12. The hydraulic control system 1000 can automatically realize the sequential actions of the stay bar 2000 and the door main body 12, and has simple and convenient operation and high safety.
Alternatively, the radius of the main cylinder 7 is the same as that of the sub cylinder 8, that is, the mass or required load force of the door main body 12 and the stay 2000 is the same, the sub cylinder 8 makes the stay 2000 gradually support the door main body 12 when the main cylinder 7 starts to open the door main body 12, and the stay 2000 moves to a position for supporting the door main body 12 just after the door is opened to the maximum opening; the sub-cylinder 8 releases the stay 2000 from the supporting position and gradually retracts when the main cylinder 7 starts to close, and the stay 2000 is just fully retracted when the door is fully closed. The hydraulic control system 1000 can automatically realize the simultaneous action of the stay bar 2000 and the door main body 12, and has simple and convenient operation and high safety.
According to an embodiment of the present invention (not shown in the figures), the first oil path 92 communicates with the second oil path 720, when the second oil path 720 is filled with oil, the rodless cavity 72 of the master cylinder is filled with oil, the master cylinder 7 opens the door main body 12, then the rodless cavity 82 of the slave cylinder is filled with oil, and the piston rod 810 of the slave cylinder 8 pushes the first section 111 to enable the support rod 2000 to play a supporting role; when the third oil path 710 is filled with oil, the rodless cavity 82 of the auxiliary oil cylinder is filled with oil, the piston rod 810 of the auxiliary oil cylinder 8 pulls the first section 111 to retract the support rod 2000, then the rod cavity 71 of the main oil cylinder is filled with oil, and the main oil cylinder 7 closes the door main body 12.
According to another embodiment of the present invention, as shown in fig. 4 and 5, the first oil path 92 is communicated with the third oil path 710, when the third oil path 710 is filled with oil, the rod chamber 71 of the master cylinder is filled with oil, the master cylinder 7 opens the door main body 12, then the rodless chamber 82 of the slave cylinder is filled with oil, and the piston rod 810 of the slave cylinder 8 pushes the first section 111 to enable the support rod 2000 to play a supporting role; when the second oil path 720 is filled with oil, the rodless cavity 82 of the auxiliary oil cylinder discharges oil, the piston rod 810 of the auxiliary oil cylinder 8 pulls the first section 111 to retract the support rod 2000, then the rodless cavity 72 of the main oil cylinder is filled with oil, and the main oil cylinder 7 closes the door main body 12.
Preferably, the stay 2000 is hinged to the door main body 12 and one end of the stay 2000 is connected to the piston rod 810 of the slave cylinder 8.
Specifically, the stay 2000 includes a first section 111, the first section 111 is connected to a piston rod 810 of the sub-cylinder 8, and the first section 111 is hinged to the door main body 12. The body of the main cylinder 7 may be fixed to the door main body 12, and one end of the first section 111 is connected to the piston rod 810 of the sub cylinder 8, so that the piston rod 810 of the sub cylinder 8 may pull or push the first section 111. The first section 111 is hinged to the door main body 12 by a hinge 110 so that the first section 111 can rotate about a hinge point, which is any point between a connection point of the first section 111 and the piston rod 810 of the sub-cylinder 8 and a connection point of the first section 111 and the second section 112.
Specifically, the strut 2000 includes a second section 112, the second section 112 being connected to the first section 111. An included angle between the second section 112 and the first section 111 is a set angle, and the set angle is an obtuse angle, so that the stay bar 2000 can be extended and retracted to the maximum extent, the space is saved, and the piston rod 810 of the auxiliary oil cylinder 8 is favorable for pushing the stay bar 2000 to rotate around a hinged point. The second section 112 and the first section 111 may be welded or integrally formed, and are not limited to this embodiment as long as they can be linked. The second section 112 and the first section 111 form a set angle, and when the first section 111 rotates, the second section 112 is driven to do arc motion around the hinge point. The set angle and the lengths of the first section 111 and the second section 112 in the embodiment of the present invention may satisfy the following conditions: when the door main body 12 is fully opened, the stay 2000 moves to a position just capable of supporting the door main body 12.
Preferably, the door main body 12 is provided with a catching groove 11 for catching the stay 2000. The box 13 is provided with a guide groove 11, one end of the second section 112 slides to a locking position of the guide groove 11 when the door body 12 is opened to a set height, and slides to a releasing position of the guide groove 11 when the door body 12 is closed, one end of the second section 112 can support the door body 12 when in the locking position, and one end of the second section 112 is separated from the guide groove 11 when in the releasing position. One end of the second segment 112 is capable of moving in an arc by the first segment 111, and the other end is capable of sliding in the guide groove 11, i.e. reciprocating between the locking position and the releasing position of the guide groove 11. The locking position of the guide groove 11 of the embodiment of the invention is at the innermost side of the guide groove 11, and the second section 112 is just clamped by the guide groove 11 when moving to the locking position of the guide groove 11, so that the door main body 12 can be firmly supported; the release position of the guide slot 11 is at the open end of the guide slot 11 and the second section 112 moves to the release position of the guide slot 11 just off the guide slot 11. According to other embodiments of the present invention, the groove depth of the locking position of the guide groove 11 is slightly larger, and the groove depths of the positions other than the locking position of the guide groove 11 are the same, which can also play the role of locking the second segment 112 and releasing the second segment 112.
The operation of the brace 2000 of an embodiment of the present invention will now be described with reference to figures 1-5 in conjunction with a hydraulic control system 1000 and a door system. The piston rod of the master cylinder 7 is connected with the door main body 12. The piston rod 810 of the slave cylinder 8 is connected to the stay 2000.
As shown in fig. 3 and 4, when the reversing valve 4 is in the right position, oil enters the rod chamber 71 of the master cylinder, the piston rod of the master cylinder 7 retracts to pull the door main body 12 to open, after the piston rod of the cylinder 7 is compressed to the bottom, that is, the door main body 12 is completely opened, hydraulic oil enters the rod chamber 82 of the slave cylinder, the piston rod 810 of the slave cylinder 8 pushes the support rod 2000 to extend, that is, the piston rod 810 of the slave cylinder 8 starts to move after the piston rod of the master cylinder 7 retracts. Because the force bearing areas of the piston heads 812 of the main cylinder 7 and the auxiliary cylinder 8 are different and the piston head 812 of the auxiliary cylinder 8 is also acted by the force of the spring 811, when the main cylinder 7 acts, the pressure generated is not enough to move the piston rod 810 of the auxiliary cylinder 8, and until the main cylinder 7 contracts to a certain distance, the pressure borne by the piston rod 810 of the auxiliary cylinder 8 is increased, that is, the pressure is increased to a level that the piston rod 810 of the auxiliary cylinder 8 can move (that is, the reason for realizing the sequential action of the main cylinder 7 and the auxiliary cylinder 8 is that the pressure borne by the piston head 812 is different). Due to the one-way circulation function of the first hydraulic control one-way valve 9, the oil entering the auxiliary oil cylinder 8 is always kept, so that the piston rod 810 of the auxiliary oil cylinder 8 is always in the extending state, namely the support rod 2000 is kept in the extending state.
As shown in fig. 2 and 5, when the direction valve 4 is in the left position, oil enters the rodless chamber 72 of the master cylinder, and the piston rod of the master cylinder 7 is pushed out, pushing the door main body 12 to close. The pilot oil path 91 of the first pilot-controlled check valve only needs a small pressure (set value of pressure at port a) to enable the first pilot-controlled check valve 9 to be opened reversely, the piston rod 810 of the auxiliary cylinder 8 is retracted rapidly under the action of oil pressure and the spring 811, and the stay rod 2000 is pulled to be retracted. However, this small pressure (the set value of the pressure at the port a) is not sufficient to move the main cylinder 7 until the pressure for moving the piston rod of the main cylinder 7 is established, and the door main body 12 is closed, that is, the main cylinder 7 is operated to close the door main body 12 after the piston rod 810 of the sub cylinder 8 is retracted. The action sequence of the auxiliary oil cylinder 8 and the main oil cylinder 7 is as follows: the door main body 12 is opened-the stay 2000 is extended-the stay 2000 is retracted-the door main body 12 is closed.
As shown in fig. 1, according to some embodiments of the present invention, the sub-cylinder 8 needs continuous power if it is required that the piston rod of the main cylinder 7 maintains the maximum compression state, i.e., the door main body 12 maintains the maximum opening degree, due to the locking function of the two-way pilot-operated check valve 5; due to the one-way conduction effect of the first hydraulic control one-way valve 9, the piston rod 810 of the auxiliary oil cylinder 8 keeps the extending state, namely the supporting rod 2000 keeps the extending state to support the door main body 12, the supporting force can be provided for the door main body 12 instead of the oil pump 2, the reversing valve can be switched to the middle position, and the energy consumption is saved.
As shown in fig. 1, according to other embodiments of the present invention, when the power of the vehicle is failed or the vehicle is dropped, the direction valve 4 is in the neutral position, and the master cylinder 7 and the slave cylinder 8 can be maintained in the existing state even though the door main body 12 and the strut 2000 are maintained in the existing state. The second oil path 720 and the third oil path 710 are both connected with the oil tank 1, at this time, the two-way hydraulic control check valve 5 plays a role of hydraulic lock, the oil pressure of the rod chamber 71 of the master cylinder and the oil pressure of the rodless chamber 72 of the master cylinder are both small, the second oil path 720 and the third oil path 710 do not flow, and the piston rod of the master cylinder 7 does not move. The first oil passage 92 is communicated with the oil tank 1, under the one-way conduction action of the first pilot-controlled check valve 9, the oil liquid in the auxiliary oil cylinder 8 does not flow, the pressure of the oil liquid in the auxiliary oil cylinder 8 is not enough to move the piston rod 810 of the auxiliary oil cylinder 8, and therefore the piston rod 810 of the auxiliary oil cylinder 8 does not act, namely the stay rod 2000 does not act. When the stay 2000 needs to be retracted, the stop valve 10 can be manually opened, the piston rod 810 of the auxiliary cylinder 8 is retracted under the action of the spring 811 after the opening, and if the stay 2000 is extended, the stay 2000 is manually pulled to overcome the pressure of the spring 811.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (14)

1. A hydraulic control system is characterized by comprising an oil tank, an oil pump, a reversing valve, a main oil cylinder and an auxiliary oil cylinder,
the oil pump is arranged on an oil path between the reversing valve and the oil tank;
the main oil cylinder and the auxiliary oil cylinder are both communicated with the reversing valve;
the reversing valve comprises a left working state and a right working state,
when the reversing valve is in a left position, oil is fed into a rodless cavity of the main oil cylinder, oil is discharged from a rod cavity of the main oil cylinder, and oil is discharged from a rodless cavity of the auxiliary oil cylinder;
when the reversing valve is in the right position, the rodless cavity of the main oil cylinder produces oil, the rod cavity of the main oil cylinder takes oil, and the rodless cavity of the auxiliary oil cylinder takes oil;
the reversing valve comprises an A port, a B port, a P port and a T port, the P port is communicated with the oil pump, and the T port is communicated with the oil tank; a first oil way is arranged between the rodless cavities of the auxiliary oil cylinders at the port B; a second oil way is arranged between the port A and the rodless cavity of the main oil cylinder; a third oil way is arranged between rod cavities of the main oil cylinder at the port B;
and a first hydraulic control one-way valve is arranged on the first oil way, a pilot oil way of the first hydraulic control one-way valve is communicated with the port A, and when the pressure of the port A is greater than a set value, the first hydraulic control one-way valve is conducted reversely.
2. The control system of claim 1,
when the reversing valve is in a left position, the port A is communicated with the port P, the second oil path takes in oil, the rodless cavity of the main oil cylinder takes in oil, the port B is communicated with the port T, the rod cavity of the main oil cylinder produces oil, the third oil path produces oil, the rodless cavity of the auxiliary oil cylinder produces oil, and the first oil path produces oil;
when the reversing valve is in the right position, the port A is communicated with the port T, the second oil way produces oil, the rodless cavity of the main oil cylinder produces oil, the port B is communicated with the port P, the rod cavity of the main oil cylinder produces oil, the third oil way produces oil, the rodless cavity of the auxiliary oil cylinder produces oil, and the first oil way produces oil.
3. The control system of claim 1, wherein the rod chamber of the slave cylinder is provided with a spring, and both ends of the spring are fixed to the cylinder wall of the slave cylinder and the piston head of the piston rod of the slave cylinder, respectively.
4. The control system of claim 1, wherein an electrically controlled directional valve is provided on the first oil passage.
5. The control system according to claim 4, wherein a manual stop valve is arranged in parallel at two ends of an oil path where the first hydraulic control one-way valve or the electric control reversing valve is located.
6. The control system according to claim 1, wherein a second pilot check valve and a third pilot check valve are provided in the second oil passage and the third oil passage, respectively, a pilot oil passage of the second pilot check valve communicates with the third oil passage, and a pilot oil passage of the third pilot check valve communicates with the second oil passage.
7. The control system according to claim 1, wherein the second oil passage and the third oil passage are each provided with a speed control valve.
8. The control system of claim 1 wherein the master cylinder has a larger radius than the slave cylinder.
9. The control system of claim 1 wherein the operating condition of the directional valve further includes a neutral position, and wherein when the directional valve is in the neutral position, both the port a and the port B are in communication with the port T.
10. The control system of claim 9, wherein the directional control valve is in a neutral position after the piston rod of the slave cylinder is extended to a maximum position.
11. A door system comprising a door main body, characterized by comprising the hydraulic control system of any one of claims 1 to 10, wherein the master cylinder is used for pushing the door main body to open and pulling the door main body to close, the slave cylinder pushes the stay bar to support the door main body when the door main body is opened, and the slave cylinder pulls the stay bar to retract when the door main body is closed.
12. The door system of claim 11, wherein a piston rod of the master cylinder is coupled to the door body, a piston rod of the slave cylinder is coupled to the brace,
when oil is fed into the rod cavity of the main oil cylinder, the piston rod of the main oil cylinder pushes the door main body to open, oil is fed into the rodless cavity of the auxiliary oil cylinder, and the auxiliary oil cylinder pushes the support rod to support the door main body;
when the rodless cavity of the auxiliary oil cylinder produces oil, the auxiliary oil cylinder pulls the support rod to retract, the rodless cavity of the main oil cylinder takes oil, and the piston rod of the main oil cylinder pulls the door main body to close.
13. The door system of claim 11, wherein the brace is hingedly coupled to the door body and one end of the brace is coupled to a piston rod of the slave cylinder.
14. The door system of claim 11, wherein the door body comprises a catch configured to catch the brace.
CN201810665870.9A 2018-06-26 2018-06-26 Hydraulic control system and door system Active CN110645212B (en)

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CN111547475B (en) * 2020-04-28 2021-12-21 中国煤炭科工集团太原研究院有限公司 Dual broken belt locking system for mining inclined conveying belt

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DE3912778A1 (en) * 1989-04-19 1990-10-25 Bosch Gmbh Robert Locking catch for pneumatic door closing mechanism - releasing catch by door opening pressure line of piston-cylinder unit
KR20050016860A (en) * 2003-08-04 2005-02-21 현대자동차주식회사 Automatic Opening and Closing Apparatus of Front Lid for Truck
CN205190413U (en) * 2015-12-07 2016-04-27 福建龙马环卫装备股份有限公司 Garbage truck back shroud cylinder control's hydraulic system
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