CN111022397A - Garage carrying trolley hydraulic system driving method - Google Patents
Garage carrying trolley hydraulic system driving method Download PDFInfo
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- CN111022397A CN111022397A CN201911378396.2A CN201911378396A CN111022397A CN 111022397 A CN111022397 A CN 111022397A CN 201911378396 A CN201911378396 A CN 201911378396A CN 111022397 A CN111022397 A CN 111022397A
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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
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H6/00—Buildings for parking cars, rolling-stock, aircraft, vessels or like vehicles, e.g. garages
- E04H6/08—Garages for many vehicles
- E04H6/12—Garages for many vehicles with mechanical means for shifting or lifting vehicles
- E04H6/18—Garages for many vehicles with mechanical means for shifting or lifting vehicles with means for transport in vertical direction only or independently in vertical and horizontal directions
- E04H6/24—Garages for many vehicles with mechanical means for shifting or lifting vehicles with means for transport in vertical direction only or independently in vertical and horizontal directions characterised by use of dollies for horizontal transport, i.e. cars being permanently parked on wheeled platforms
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Abstract
The invention discloses a driving method of a hydraulic system of a garage carrying trolley, which utilizes the hydraulic system to drive the garage carrying trolley to run, wherein the clamping and fixing of wheels of a vehicle to be carried are realized by controlling the rotation of a clamping arm through a swing cylinder, the up-and-down lifting of a frame on the carrying trolley is realized by driving a lifting cylinder, the forward and backward movement of the carrying trolley is realized by driving a traveling motor, and the forward and backward rotation of the clamping arm, the up-and-down lifting of the lifting cylinder and the forward and backward movement of the trolley are respectively realized by a reversing valve connected with the hydraulic system; the driving speeds of the walking motor, the lifting cylinder and the swinging cylinder are controlled by the hydraulic system flow, and the driving loads of the walking motor, the lifting cylinder and the swinging cylinder are controlled by the hydraulic system pressure; the driving load is the weight of the vehicle carried by the carrying trolley. The invention can adapt to the requirements of the carrying trolley on various different working conditions by adjusting the power through the hydraulic system, and the operation process is safe and reliable.
Description
Technical Field
The invention relates to the technical field of carrying trolleys, in particular to a driving method of a hydraulic system of a garage carrying trolley.
Background
The modern intelligent warehouse management system and the intelligent parking garage have increasingly intensified requirements, the carrying trolley carried by the automobile is also rapidly developed, the carrying trolley becomes an important implementation mode of the modern intelligent parking garage, and the intelligent parking garage has the function of lifting the weight of the modern intelligent warehouse management system. At present, intelligent warehousing and intelligent parking garages at home and abroad can not be widely applied, and a plurality of technical difficulties which are not overcome yet exist. The movement flexibility of the carrying trolley still has a larger ascending space, so that the movement flexibility and the movement reliability of the carrying trolley are improved, and the carrying trolley is of great importance to the working efficiency and is an important direction for development and research.
However, the carrying trolleys in the prior art are all driven in an electric control mode, the carrying trolleys adopting the electric control mode are good in stability, but the carrying trolleys are not enough in flexibility and low in efficiency, have certain application defects in places with high requirements on storage, garages and the like and limited spaces, and are difficult to move in a precise transverse direction, a precise longitudinal direction and a precise curved track particularly under the condition that the electric control type carrying trolleys are not suitable for heavy loads, so that a power system of the carrying trolleys still needs to be improved.
When a common carrying trolley carries a vehicle to be parked, the wheels of the vehicle need to be clamped and fixed firstly, then the vehicle is lifted to a certain height along with a frame to be suspended, and finally the vehicle moves to a parking place to be parked or is taken out of the parking place. If a driving mode other than electric control, such as hydraulic control, is adopted, different lifting forces and driving forces are needed due to different dead weights of different vehicles, and the adaptability to various working conditions, such as overall control coordination of actions of clamping, lifting, running and the like, and safety control in the running process are all technical problems to be solved.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: the driving method of the hydraulic system of the garage carrying trolley is provided, the power can be adjusted to meet the requirements of the carrying trolley on various different working conditions, and the operation process is safe and reliable.
In order to solve the technical problems, the invention adopts the following technical scheme:
a driving method of a hydraulic system of a garage carrying trolley drives the garage carrying trolley to run by utilizing the hydraulic system, wherein the clamping and fixing of wheels of a vehicle to be carried are realized by controlling the rotation of a clamping arm through a swing cylinder, the up-and-down lifting of a frame on the carrying trolley is realized by driving a lifting cylinder, the forward and backward movement of the carrying trolley is realized by driving a walking motor, and the forward and backward rotation of the clamping arm, the up-and-down lifting of the lifting cylinder and the forward and backward movement of the trolley are respectively realized by a reversing valve connected to the hydraulic system; the driving speeds of the walking motor, the lifting cylinder and the swinging cylinder are controlled by the hydraulic system flow, and the driving loads of the walking motor, the lifting cylinder and the swinging cylinder are controlled by the hydraulic system pressure; the driving load is the weight of the vehicle carried by the carrying trolley.
In the method, the hydraulic system is used for driving the carrying trolley to run, and compared with the traditional carrying trolley which adopts an electric driving mode, the method improves the movement flexibility and the movement reliability of the carrying trolley and can improve the working efficiency of the carrying trolley.
As optimization, the hydraulic system comprises a variable pump, a motor and an execution assembly of a carrying trolley, wherein the motor is connected with the variable pump, an output oil port of the variable pump is connected with a main oil inlet path, an input oil port of the variable pump is connected with a main oil return path, and the main oil inlet path and the main oil return path form a closed main oil path; the main oil circuit is internally provided with an adjusting mechanism for automatically adjusting the flow entering the execution assembly, the adjusting mechanism comprises a shuttle valve, an electromagnetic servo valve and a hydraulic cylinder, wherein two input ends of the shuttle valve are respectively connected with the main oil inlet circuit and the main oil return circuit, the output end of the shuttle valve is connected with the input end of the electromagnetic servo valve, two output ends of the electromagnetic servo valve are respectively correspondingly connected with two cavities of the hydraulic cylinder, a piston rod of the hydraulic cylinder is connected with a gear adjusting rod of the variable pump, the electromagnetic servo valve receives an electric signal and correspondingly adjusts the position of a piston plate of the hydraulic cylinder by adjusting the oil amount entering the two cavities of the hydraulic cylinder, so that the piston rod moves to pull an adjusting rod on the variable pump to adjust the output flow of the variable pump so as to meet the operation demand speed of the execution assembly, and the adjusting mechanism further comprises a control system for controlling the.
Therefore, the adopted variable pump is a bidirectional variable pump, so that an oil inlet and an oil return port in the variable pump can be mutually converted according to requirements; during specific implementation, a shaft of the motor acts on a shaft of the variable pump, and oil pumped out by the variable pump provides power for an execution assembly of the carrying trolley, so that the normal work of the execution assembly is ensured; the speed of the existing carrying trolley in the running process needs to be regulated and controlled constantly, the flow pumped out by the variable pump directly influences the running speed of the execution assembly, so the output flow of the variable pump is controlled by the matching of the electromagnetic servo valve and the hydraulic cylinder, and the speed of the execution assembly is automatically controlled, the specific regulating process is that when the carrying trolley needs to work at a higher speed, the flow of a main oil inlet channel needs to be increased, so oil in a main oil channel flows into the electromagnetic servo valve through the shuttle valve, the electromagnetic servo valve receives a signal instruction which is transmitted by a control system and increases the flow of the main oil channel, the electromagnetic servo valve can regulate the flow and the direction of the flow entering the servo valve, the corresponding flow of two cavities entering the hydraulic cylinder is regulated through the electromagnetic servo valve, a piston plate in the hydraulic cylinder moves, and a piston rod is driven to move, the piston rod pulls an adjusting rod on the variable pump to automatically adjust the output flow of the variable pump, so that the output flow of the variable pump is controlled to adapt to the action of the movement required speed of the execution assembly; therefore, the variable pump is acted by the cooperation of the electromagnetic servo valve and the hydraulic cylinder, the variable pump can automatically adjust the flow in the main oil way, the requirements of different working conditions of the carrying trolley are met, and the carrying trolley is more intelligent to control.
As optimization, an oil supplementing system for supplementing oil to a main oil way is arranged in the hydraulic system, the oil supplementing system comprises an oil supplementing tank, an oil supplementing pump and an oil supplementing loop, the oil supplementing loop comprises an oil supplementing inlet way and an oil supplementing return way, an oil return port of the oil supplementing tank is communicated with the oil supplementing return way, an oil outlet of the oil supplementing tank is connected with a stop valve for controlling the on-off of the oil supplementing tank, the output end of the stop valve is connected with the input end of the oil supplementing pump, and the output end of the oil supplementing pump is connected with a first one-way valve for preventing oil of the oil supplementing inlet; the oil supplementing pump is used for guiding oil in the oil supplementing tank into a low-pressure oil circuit area in the main oil circuit so as to supplement oil for the hydraulic system; the oil supply device is characterized in that an oil supplementing branch is connected between the main oil inlet path and the main oil return path in parallel, two second one-way valves are connected to the oil supplementing branch, the output ends of the two second one-way valves are arranged in a back-to-back mode, and the oil supplementing path is connected between the two second one-way valves on the oil supplementing branch.
Therefore, the hydraulic system is a closed oil circuit, when leakage exists in the hydraulic system or the pressure is insufficient, oil needs to be supplemented through the oil supplementing system, oil is absorbed from the oil supplementing tank through the oil supplementing pump, the oil in the oil supplementing tank is led into the low-pressure oil circuit in the main oil circuit through the oil supplementing pump, oil is supplemented at the leakage position of the execution assembly in the operation process, and the phenomenon that the variable pump is vacuumed to cause insufficient pressure of the hydraulic system, so that the hydraulic system cannot normally work and noise is generated is avoided; the second one-way valve is used for avoiding high-pressure oil return in the process of connecting oil of the oil supplementing pump into a low-pressure oil circuit area in the main oil circuit.
And as optimization, an oil supplementing overflow valve is also connected in series on a supplementing oil return path of the oil supplementing tank.
Therefore, when the oil quantity supplemented into the main oil circuit by the oil supplementing system is too large, the oil pressure is too high, and when the oil pressure is greater than the pressure set value of the oil supplementing overflow valve, part of oil liquid of the oil supplementing system can directly return to the oil supplementing tank through the oil supplementing overflow valve, so that the oil pressure control of the oil supplementing loop is realized.
As optimization, still including the strainer valve among the oil supplementing system, the strainer valve is connected and is set up between the output of stop valve and oil supplementing pump input.
Therefore, the filter valve is arranged in the oil supplementing system, so that impurities such as dust particles are prevented from entering the hydraulic system, all oil liquid before entering the hydraulic system is ensured to be filtered by the filter valve, and the oil liquid cleanliness of the oil supplementing loop and the main oil way is accurately controlled.
And as optimization, a first pressure reducing overflow valve is respectively connected in parallel between two ends of the two second one-way valves on the oil supplementing branch, the input port of the first pressure reducing overflow valve is connected with the output end of the corresponding second one-way valve, the output port of the first pressure reducing overflow valve is connected on the oil supplementing branch between the two second one-way valves, and the pressure setting value of the first pressure reducing overflow valve is greater than that of the oil supplementing overflow valve.
Therefore, in the operation process of the carrying trolley, the oil pressure of the main oil way is suddenly increased due to various reasons, and therefore for the protection of the hydraulic system, when the oil pressure value of the main oil inlet way is larger than the pressure setting value of the first pressure reduction overflow valve, the first pressure reduction overflow valve on the oil supplementing branch is automatically opened under the action of high pressure, and high-pressure oil flows into the oil supplementing tank through the oil supplementing return way after passing through the first pressure reduction overflow valve, so that the oil pressure on the main oil inlet way is adjusted, the whole hydraulic system works stably, meanwhile, the hydraulic system is guaranteed not to be damaged, and in the process, the pressure setting value of the first pressure reduction overflow valve is larger than the oil supplementing overflow valve, so that the oil supplementing overflow valve cannot block the oil passing through the first pressure reduction overflow valve; on the contrary, when the oil pressure of the main oil return path is too high, the oil passes through the first pressure reduction overflow valve connected in parallel on the main oil return path and then flows into the oil supplementing tank, and the oil pressure regulation of the main oil path is completed.
Preferably, the output end of the shuttle valve is further connected with a second pressure reduction overflow valve, the output end of the second pressure reduction overflow valve is connected with an oil return opening of the oil supplementing tank so as to drain oil entering the shuttle valve into the oil supplementing tank to protect the hydraulic cylinder, and the pressure setting value of the second pressure reduction overflow valve is equal to the pressure setting value of the first pressure reduction overflow valve.
Like this, still be connected with second decompression overflow valve on the output through the shuttle valve, and the pressure setting value of second decompression overflow valve equals first decompression overflow valve, consequently when the oil pressure on the main oil supply way is too high, first decompression overflow valve and second decompression overflow valve can simultaneous working, first decompression overflow valve regulation time is limited, when the regulating power is restricted, second decompression overflow valve and second decompression overflow valve simultaneous working, can accelerate the pressure release speed of fluid in the main oil way, in order to ensure the safety of pneumatic cylinder, and through second decompression overflow valve, can assist the regulation and control to the high-pressure fluid of main oil way, improve regulation and control efficiency.
As optimization, the executing assembly comprises a plurality of executing elements connected in parallel, each executing element comprises a walking motor, a lifting cylinder and a swinging cylinder, the walking motor is used for driving the carrying trolley to move forwards or backwards, the lifting cylinder is used for driving the upper frame of the carrying trolley to lift upwards and downwards, and the swinging cylinder is used for controlling each group of clamping arms on the frame to clamp or loosen wheels of the vehicle to be stopped; the two walking motors are arranged, the frame of the carrying trolley is divided into a front frame and a rear frame which are independent, and the front frame and the rear frame are correspondingly provided with one walking motor for driving the front frame and the rear frame to move forwards and backwards; the lifting cylinders are arranged in two, and the front frame and the rear frame are respectively provided with one lifting cylinder for lifting the front frame and the rear frame so as to lift the vehicle on the frames; the number of the swing cylinders is four, a front group of clamp arms and a rear group of clamp arms are arranged on the front frame and the rear frame, each group of clamp arms comprises two clamp arms on the left side and the right side of the frame, and each swing cylinder correspondingly acts on one group of clamp arms; eight reversing valves are connected in parallel between the main oil inlet path and the main oil return path, the reversing valves are three-position four-way reversing valves, the number of the reversing valves is equal to the number of the executing elements, and each reversing valve correspondingly controls one executing element; two input ends of the reversing valve are respectively connected with the main oil inlet and the oil inlet in the execution element, two output ends of the reversing valve are respectively connected with the main oil return path and the oil return port in the execution element to form a closed loop, and corresponding appointed movement in the execution assembly is completed by reversing the reversing valve.
The carrying trolley comprises a walking motor, a lifting cylinder and a swinging cylinder, wherein the walking motor drives the carrying trolley to move, the lifting cylinder drives a frame on the carrying trolley to lift up and down, and the swinging cylinder controls each group of clamping arms on the frame to clamp or loosen wheels of a vehicle to be stopped; when the carrying trolley moves forwards, the motor drives the variable pump to rotate to pump out oil, and when a reversing valve corresponding to the walking motor is connected to a hydraulic system at the left position, the walking motor starts to work to drive the carrying trolley to move forwards; when the carrying trolley needs to retreat, the motor drives the variable pump to rotate, and when a reversing valve corresponding to the walking motor is connected to the hydraulic system at the right position, the walking motor starts to work to drive the carrying trolley to retreat; similarly, when the frame of the carrying trolley is lifted, after the trolley is driven by the walking motor to reach a preset position, the two electromagnetic directional valves corresponding to the walking motor are reset, the trolley stops moving, then the electromagnetic directional valves corresponding to the lifting cylinders are controlled to enable the electromagnetic directional valves to be connected to the system at the right position, and oil enters the rodless cavity to enable the frame to be lifted; when the frame descends, the corresponding electromagnetic directional valve is switched into the left position; when wheels of a vehicle to be stopped on the frame need to be clamped, the action of the clamping arms is realized through the swinging cylinders, the reversing valves corresponding to the four groups of clamping arms are controlled, the left positions of the reversing valves are connected to the system, all the swinging cylinders simultaneously act and clamp the wheels, and when the right positions of the electromagnetic reversing valves are connected to the system, the swinging cylinders simultaneously act and release the wheels; the swinging cylinder, the lifting cylinder and the hydraulic motor all act independently, so that a hydraulic system is not required to provide too large pressure and flow, and the closed type hydraulic system is completely suitable for the closed type hydraulic system.
Preferably, a one-way speed regulating valve and a hydraulic control one-way valve are connected between the input end of the lifting cylinder and the corresponding reversing valve, and the input end of the hydraulic control one-way valve is also connected with the output end of the lifting cylinder so as to support the load of the frame through the hydraulic control one-way valve.
Therefore, in order to ensure that the lifting cylinder can achieve high lifting speed and low descending speed, the one-way speed regulating valve is arranged, because the entering direction of oil is the same as that of the one-way speed regulating valve, the oil directly enters the rodless cavity through the one-way speed regulating valve and the hydraulic control one-way valve, the one-way speed regulating valve only serves as the one-way valve, the oil can rapidly pass through the one-way speed regulating valve, the speed regulating function is not achieved, the frame can rapidly ascend, and the parking efficiency can be accelerated; after the frame is lifted, the lifting cylinder stops, and due to the unidirectionality of the hydraulic control one-way valve, oil does not enter between the input end of the hydraulic control one-way valve and the output end of the lifting cylinder, the hydraulic control one-way valve cannot be opened, and oil in the rodless cavity cannot flow back through the hydraulic control one-way valve, so that the lifting cylinder can be continuously stable, and the continuous lifting of the frame by the hydraulic cylinder can be ensured; then when the frame descends, the one-way speed regulating valve can ensure that the frame descends slowly under the action of the one-way speed regulating valve when the frame descends, and the protection of vehicles on the frame is facilitated.
Preferably, an overflow branch is connected in parallel between two ends of the walking motor, two third check valves are arranged on the overflow branch, output ends of the two third check valves are oppositely arranged, a third overflow valve is connected between the two third check valves on the overflow branch, and an outlet end of the third overflow valve is connected with the oil supplementing tank.
Like this, come the cooperation third overflow valve through setting up the third check valve, the third check valve ensures the unidirectionality of oil circuit, can guarantee through the third overflow valve that the walking motor is loaded when starting, and the import oil pressure can not be too big, plays the safety protection effect, and the pressure setting value of third overflow valve is less than the pressure setting value of first decompression overflow valve, guarantees like this that fluid in the main oil circuit enters into the walking motor and works, and can directly not follow the spill in the first decompression overflow valve and walk.
Preferably, a cooler is arranged on a main oil path between the variable displacement pump and the execution assembly.
Like this, when the load change among the executive component is too fast, lead to the oil pressure constantly to change, the temperature of fluid also can sharply rise so, through set up the cooler on main oil inlet way and main oil return way, can guarantee to get into the fluid temperature among the executive component, played the guard action to the executive component.
In conclusion, the beneficial effects of the invention are as follows: the hydraulic system is used for driving the carrying trolley to run, compared with the traditional carrying trolley which adopts an electric driving mode, the movement flexibility and the movement reliability of the carrying trolley are improved, the working efficiency of the carrying trolley can be improved, the hydraulic system adopts bidirectional symmetrical arrangement, an oil inlet and an oil return port in a variable pump can be mutually converted according to needs, the flow of the hydraulic system can be controlled by a servo valve, and the electric signal regulation of the control system is realized, so that the electric signal regulation system is suitable for the requirements of different working conditions of the carrying trolley; meanwhile, the oil supplementing system can supplement oil to the hydraulic system and also can receive oil returned by overflow of the hydraulic system, so that the stability and the safety of the hydraulic system are kept; and the swinging cylinder, the lifting cylinder and the hydraulic motor of the execution assembly in the carrying trolley are mutually independently operated, so that the parallel reversing valve is adopted to independently control, the hydraulic system is not required to provide too large pressure and flow, and the complexity of the hydraulic system is reduced.
Drawings
For purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made in detail to the present invention as illustrated in the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a hydraulic system of the present invention;
FIG. 2 is a schematic diagram of an actuator assembly of the present invention;
fig. 3 is a schematic diagram of the working principle of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Reference numerals in the drawings of the specification include: the hydraulic control system comprises a motor 1, a variable pump 2, an electromagnetic servo valve 3, a hydraulic cylinder 4, a first check valve 5, a second check valve 6, a third check valve 7, a first pressure-reducing overflow valve 8, a second pressure-reducing overflow valve 9, a shuttle valve 10, a stop valve 11, a filter valve 12, an oil supplementing pump 13, a third overflow valve 14, a cooler 15, an oil supplementing tank 16, a reversing valve 17, a swing cylinder 18, a traveling motor 19, a lifting cylinder 20, a hydraulic control check valve 21, a one-way speed regulating valve 22 and an oil supplementing overflow valve 23.
The invention relates to a driving method of a hydraulic system of a garage carrying trolley, which drives the garage carrying trolley to run by utilizing the hydraulic system, wherein the clamping and fixing of wheels of a vehicle to be carried are realized by controlling the rotation of a clamping arm through a swinging cylinder 18, the up-and-down lifting of a frame on the carrying trolley is realized by driving a lifting cylinder 20, the forward and backward movement of the carrying trolley is realized by driving a walking motor 19, and the forward and backward rotation of the clamping arm, the up-and-down lifting of the lifting cylinder 20 and the forward and backward movement of the trolley are respectively realized by a reversing valve 17 connected with the hydraulic system; the driving speeds of the walking motor 19, the lifting cylinder 20 and the swinging cylinder 18 are controlled by the hydraulic system flow, and the driving loads of the walking motor 19, the lifting cylinder 20 and the swinging cylinder 18 are controlled by the hydraulic system pressure; the driving load is the weight of the vehicle carried by the carrying trolley.
In the method, the hydraulic system is used for driving the carrying trolley to run, and compared with the traditional carrying trolley which adopts an electric driving mode, the method improves the movement flexibility and the movement reliability of the carrying trolley and can improve the working efficiency of the carrying trolley.
As an optimization, the hydraulic system related in the method, as shown in fig. 1, fig. 2 and fig. 3, includes a variable pump 2, a motor 1 and an execution assembly of a carrying trolley, the motor is connected with the variable pump 2, an output oil port of the variable pump 2 is connected with a main oil inlet, an input oil port of the main oil inlet is connected with a main oil return, and the main oil inlet and the main oil return form a closed main oil path; an adjusting mechanism for automatically adjusting the flow entering the execution assembly is arranged in the main oil way, the adjusting mechanism comprises a shuttle valve 10, an electromagnetic servo valve 3 and a hydraulic cylinder 4, wherein, two input ends of the shuttle valve 10 are respectively connected with a main oil inlet path and a main oil return path, the output end is connected with the input end of the electromagnetic servo valve 3, two output ends of the electromagnetic servo valve 3 are respectively connected with two chambers of the hydraulic cylinder 4 correspondingly, a piston rod of the hydraulic cylinder 4 is connected with a gear adjusting rod of the variable displacement pump 2, the electromagnetic servo valve 3 receives an electric signal and correspondingly adjusts the position of a piston plate of the hydraulic cylinder 4 by adjusting the oil volume entering the two chambers of the hydraulic cylinder 4, so that the piston rod moves to pull an adjusting rod on the variable pump 2 to adjust the output flow of the variable pump 2 to meet the operation requirement speed of the execution assembly, and the control system controls the execution assembly and the electromagnetic servo valve 3 to operate.
In the invention, the adopted variable pump 2 can be a bidirectional variable pump 2, so that an oil inlet and an oil return port in the variable pump 2 can be mutually converted according to requirements; during specific implementation, the shaft of the motor 1 acts on the shaft of the variable pump 2, and oil pumped out by the variable pump 2 provides power for an execution assembly of the carrying trolley, so that the normal work of the execution assembly is ensured; the speed of the existing carrying trolley in the running process needs to be regulated and controlled constantly, and the flow pumped out by the variable pump 2 directly influences the running speed of the execution assembly, so that the flow pumped out by the variable pump 2 is controlled by matching the electromagnetic servo valve 3 and the hydraulic cylinder 4, and the speed of the execution assembly is automatically controlled; the specific adjusting process is that when the carrying trolley needs to work at a higher speed, the flow of a main oil inlet path needs to be increased, so that oil in the main oil path flows into the electromagnetic servo valve 3 through the shuttle valve 10, after the electromagnetic servo valve 3 receives a signal instruction which is transmitted by the control system and is used for increasing the flow of the main oil path, the electromagnetic servo valve can adjust the flow and the direction entering the servo valve, the electromagnetic servo valve 3 adjusts the corresponding flow of two cavities entering the hydraulic cylinder 4, so that the piston plate in the hydraulic cylinder 4 moves, the piston plate moves to drive the piston rod to move, the piston rod moves to pull the adjusting rod on the variable pump 2 to automatically adjust the output flow of the variable pump 2, and the output flow of the variable pump 2 is controlled to adapt to the movement demand speed of the execution assembly; therefore, the variable pump 2 is acted by the cooperation of the electromagnetic servo valve 3 and the hydraulic cylinder 4, so that the variable pump 2 can automatically adjust the flow in the main oil way to meet the requirements of different working conditions of the carrying trolley, and the carrying trolley is more intelligently controlled.
In a specific embodiment, an oil supplementing system for supplementing oil to a main oil way is arranged in the hydraulic system, the oil supplementing system comprises an oil supplementing tank 16, an oil supplementing pump 13 and an oil supplementing loop, the oil supplementing loop comprises an oil supplementing inlet way and an oil supplementing return way, an oil return port of the oil supplementing tank 16 is communicated with the oil supplementing return way, an oil outlet of the oil supplementing tank 16 is connected with a stop valve 11 for controlling the opening and closing of the oil supplementing tank 16, the output end of the stop valve 11 is connected with the input end of the oil supplementing pump 13, and the output end of the oil supplementing pump 13 is connected with a first one-way valve 5 for preventing the oil in the oil supplementing channel; the oil supplementing pump 13 is used for guiding oil in the oil supplementing tank 16 into a low-pressure oil circuit area in the main oil circuit so as to supplement oil for the hydraulic system; an oil supplementing branch is connected in parallel between the main oil inlet path and the main oil return path, two second one-way valves 6 are connected to the oil supplementing branch, the output ends of the two second one-way valves 6 are arranged in a back-to-back mode, and the oil supplementing path is connected between the two second one-way valves 6 on the oil supplementing branch.
Thus, because the hydraulic system is a closed oil circuit, when leakage exists in the hydraulic system or the pressure is insufficient, oil needs to be supplemented through the oil supplementing system, the oil supplementing pump 13 absorbs oil from the oil supplementing tank 16, the oil supplementing pump 13 guides oil in the oil supplementing tank 16 into a low-pressure oil circuit in a main oil circuit, oil is supplemented at the leakage position of an execution assembly in the operation process, and the phenomenon that the variable pump 2 is vacuumed to cause insufficient pressure of the hydraulic system, so that the hydraulic system cannot normally work and generates noise is avoided; the second one-way valve is used for avoiding high-pressure oil return in the process of connecting oil of the oil supplementing pump into a low-pressure oil circuit area in the main oil circuit.
In the specific embodiment, an oil supply relief valve 23 is also connected in series to the oil supply return line of the oil supply tank 16.
Therefore, when the oil quantity supplemented into the main oil circuit by the oil supplementing system is too large, the oil pressure is too high, and the oil pressure is greater than the pressure set value of the oil supplementing overflow valve 23, a part of oil liquid of the oil supplementing system can directly return to the oil supplementing tank 16 through the oil supplementing overflow valve 23, and the oil pressure control of the oil supplementing circuit is realized.
In the specific embodiment, the oil supplementing system further comprises a filter valve 12, and the filter valve 12 is connected and arranged between the output end of the stop valve 11 and the input end of the oil supplementing pump 13.
Therefore, the filter valve 12 is arranged in the oil supplementing system, so that impurities such as dust particles are prevented from entering the hydraulic system, all oil liquid before entering the hydraulic system is ensured to be filtered by the filter valve 12, and the oil liquid cleanliness of the oil supplementing loop and the main oil way is accurately controlled.
In a specific embodiment, a first pressure-reducing overflow valve 8 is connected in parallel between two ends of each of the two second check valves 6 on the oil supplementing branch, an input port of the first pressure-reducing overflow valve 8 is connected with an output port of the corresponding second check valve 6, an output port of the first pressure-reducing overflow valve is connected to the oil supplementing branch between the two second check valves 6, and a pressure setting value of the first pressure-reducing overflow valve 8 is greater than a pressure setting value of the oil supplementing overflow valve 23.
Therefore, in the operation process of the carrying trolley, the oil pressure of the main oil way is suddenly increased due to various reasons, and therefore for the protection of the hydraulic system, when the oil pressure value of the main oil inlet way is larger than the pressure setting value of the first pressure reduction overflow valve 8, the first pressure reduction overflow valve 8 on the oil supplementing branch is automatically opened under the action of high pressure, high-pressure oil passes through the first pressure reduction overflow valve 8 and then flows into the oil supplementing tank 16 through the oil supplementing return way, so that the oil pressure on the main oil inlet way is adjusted, the whole hydraulic system works stably, meanwhile, the hydraulic system is guaranteed not to be damaged, and in the process, the pressure setting value of the first pressure reduction overflow valve 8 is larger than the oil supplementing overflow valve 23, so that the oil supplementing overflow valve 23 cannot block the oil passing through the first pressure reduction overflow valve 8; on the contrary, when the oil pressure of the main oil return path is too high, the oil passes through the first pressure reducing overflow valve 8 connected in parallel on the main oil return path and then flows into the oil supplementing tank 16, so that the oil pressure regulation of the main oil return path is completed.
In a specific embodiment, the output end of the shuttle valve 10 is further connected with a second pressure reducing overflow valve 9, the output end of the second pressure reducing overflow valve 9 is connected with an oil return port of an oil supplementing tank 16 so as to drain the high-pressure oil entering the shuttle valve 10 into the oil supplementing tank 16 to achieve the effect of protecting the hydraulic cylinder 4, and the pressure setting value of the second pressure reducing overflow valve 9 is equal to the pressure setting value of the first pressure reducing overflow valve 8.
Like this, still be connected with second relief overflow valve 9 on the output through shuttle valve 10, and the pressure setting value of second relief overflow valve 9 equals first relief overflow valve 8, consequently when the oil pressure on the main oil inlet way is too high, first relief overflow valve 8 and second relief overflow valve 9 can simultaneous working, first relief overflow valve 8 regulation time is limited, when regulating power is limited, second relief overflow valve 9 and first relief overflow valve 8 simultaneous working, can accelerate the pressure release speed of fluid in the main oil way, with the safety of ensureing pneumatic cylinder 4, and through second relief overflow valve 9, also can assist the regulation and control to the high-pressure fluid of main oil way, improve regulation and control efficiency.
In a specific embodiment, the executing assembly comprises a plurality of executing elements connected in parallel, the executing elements comprise a walking motor 19, a lifting cylinder 20 and a swinging cylinder 18, the walking motor 19 is used for driving the carrying trolley to move forward or backward, the lifting cylinder 20 is used for driving a frame on the carrying trolley to lift up and down, and the swinging cylinder 18 is used for controlling each group of clamping arms on the frame to clamp or release wheels of the vehicle to be stopped; the two walking motors 19 are arranged, the frame of the carrying trolley is divided into a front frame and a rear frame which are independent, and the front frame and the rear frame are respectively and correspondingly provided with the walking motor 19 for driving the front frame and the rear frame to move forwards and backwards; the number of the lifting cylinders 20 is two, and the front frame and the rear frame are both provided with one lifting cylinder 20 for lifting the front frame and the rear frame to lift the vehicle on the frames; the number of the swing cylinders 18 is four, a front group of clamping arms and a rear group of clamping arms are arranged on the front frame and the rear frame, each group of clamping arms comprises two clamping arms on the left side and the right side of the frame, and each swing cylinder 18 acts on one group of clamping arms correspondingly; eight reversing valves 17 are connected in parallel between the main oil inlet path and the main oil return path, the reversing valves 17 are three-position four-way reversing valves 17, the number of the reversing valves 17 is equal to the number of the executing elements, and each reversing valve 17 correspondingly controls one executing element; two input ends of the reversing valve 17 are respectively connected with the main oil inlet and the oil inlet in the actuating element, and two output ends of the reversing valve 17 are respectively connected with the main oil return path and the oil return port in the actuating element, so that a closed loop is formed, and corresponding appointed movement in the actuating assembly is completed through reversing of the reversing valve 17.
Thus, the carrying trolley comprises a walking motor 19, a lifting cylinder 20 and a swinging cylinder 18, the walking motor 19 drives the carrying trolley to move, the lifting cylinder 20 drives a frame on the carrying trolley to lift up and down, and the swinging cylinder 18 controls each group of clamping arms on the frame to clamp or release wheels of a vehicle to be stopped; when the carrying trolley moves forwards, the motor 1 drives the variable pump 2 to rotate to pump oil out, and when the left position of the reversing valve 17 corresponding to the walking motor 19 is connected to a hydraulic system, the walking motor 19 starts to work to drive the carrying trolley to move forwards; when the carrying trolley needs to retreat, the motor 1 drives the variable pump 2 to rotate, and when the reversing valve 17 corresponding to the walking motor 19 is connected to a hydraulic system at the right position, the walking motor 19 starts to work to drive the carrying trolley to retreat; similarly, when the frame of the carrying trolley is lifted, after the trolley is driven by the traveling motor 19 to reach a preset position, the two electromagnetic directional valves 17 corresponding to the traveling motor 19 are reset, the trolley stops moving, then the electromagnetic directional valves 17 corresponding to the lifting cylinder 20 are controlled to enable the right position of the trolley to be connected to the system, and oil enters the rodless cavity to enable the frame of the trolley to be lifted; when the frame descends, the corresponding electromagnetic directional valve 17 is switched to the left position; when the wheels of the vehicle to be stopped on the frame need to be clamped, the action of the clamping arms is realized through the swinging cylinders 18, the reversing valves 17 corresponding to the four groups of clamping arms are controlled, the left positions of the reversing valves 17 are connected to the system, all the swinging cylinders 18 simultaneously act and clamp the wheels, and when the right positions of the electromagnetic reversing valves 17 are connected to the system, the swinging cylinders 18 simultaneously act and release; the swing cylinder 18, the lifting cylinder 20 and the hydraulic motor all act independently of one another, so that the hydraulic system is not required to provide too much pressure and flow, and the closed hydraulic system is fully applicable here.
In a specific embodiment, a one-way speed regulating valve 22 and a hydraulic control one-way valve 21 are connected between the input end of the lifting cylinder 20 and the corresponding reversing valve 17, and the input end of the hydraulic control one-way valve 21 is also connected with the output end of the lifting cylinder 20 to support the load of the frame.
Therefore, in order to ensure that the lifting cylinder 20 can realize quick lifting and slow descending, the unidirectional speed regulating valve 22 is arranged, because the entering direction of oil is the same as that of the unidirectional speed regulating valve 22, the oil directly enters the rodless cavity through the unidirectional speed regulating valve 22 and the hydraulic control one-way valve 21, the unidirectional speed regulating valve 22 only serves as a one-way valve, so that the oil can quickly pass through the unidirectional speed regulating valve, the speed regulating function is not realized, the frame can quickly ascend, and the parking efficiency can be accelerated; after the frame is lifted, the lifting cylinder 20 stops, and due to the unidirectionality of the hydraulic control one-way valve 21, oil does not enter between the input end of the hydraulic control one-way valve 21 and the output end of the lifting cylinder 20, the hydraulic control one-way valve 21 cannot be opened, and oil in a rodless cavity cannot flow back through the hydraulic control one-way valve 21, so that the lifting cylinder 20 can be continuously and stably, and the continuous lifting of the frame by the hydraulic cylinder 4 can be ensured; then when the frame descends, the one-way speed regulating valve 22 can ensure that the frame descends slowly under the action of the one-way speed regulating valve 22 when the frame descends, which is beneficial to protecting the vehicle on the frame.
In a specific implementation process, an overflow branch is connected in parallel between two ends of the traveling motor 19, two third check valves 7 are arranged on the overflow branch, output ends of the two third check valves 7 are arranged in opposite directions, a third overflow valve 14 is connected between the two third check valves 7 on the overflow branch, and an outlet end of the third overflow valve 14 is connected with an oil supplementing tank 16.
Like this, come the cooperation third overflow valve 14 through setting up third check valve 7, third check valve 7 guarantees that its fluid passes through the unidirectionality, and third overflow valve 14 can guarantee that when walking motor 19 takes the load to start, the import oil pressure can not be too big, plays the safety protection effect. The pressure setting value of the third relief valve 14 is smaller than that of the first pressure-reducing relief valve 8, so that the oil in the main oil path is ensured to enter the traveling motor to work, and the oil cannot directly overflow from the first pressure-reducing relief valve.
In the specific embodiment, a cooler 15 is arranged on the main oil path between the variable displacement pump 2 and the actuating assembly.
Like this, when the load change among the executive component is too fast, lead to the oil pressure constantly to change, the temperature of fluid also can sharply rise, through set up cooler 15 respectively on main oil inlet way and main oil return way, can guarantee to get into the fluid temperature among the executive component, played the guard action to the executive component.
In order to better understand the scheme, the hydraulic system can meet the following conditions in specific implementation, the first condition is that, for example, when the operation speed of an execution assembly in a carrying trolley needs to be accelerated, the flow of a main oil inlet path needs to be increased, oil in a main oil path flows into an electromagnetic servo valve 3 through a shuttle valve 10, after the electromagnetic servo valve 3 receives an electric signal instruction for increasing the flow of the main oil path, the electromagnetic servo valve can adjust the flow and the direction of the flow entering the servo valve, the corresponding flow entering two cavities of a hydraulic cylinder 4 is adjusted through the electromagnetic servo valve 3, a piston plate in the hydraulic cylinder 4 moves, so that the piston plate drives a piston rod to move, the piston rod pulls an adjusting rod on a variable pump 2 to automatically adjust the output flow of the variable pump 2, so as to control the output flow of the variable pump 2 and adapt to the action of the motion demand speed of the execution assembly, if the running speed of an execution assembly in the carrying trolley is required to be slowed down, the flow entering the main oil inlet path is reduced in a manner opposite to the action; therefore, the output flow of the hydraulic system can be automatically adjusted after being connected with the signal of the control system through the electromagnetic servo valve, so that the running speed of the carrying trolley is adjusted, the hydraulic system is suitable for various working conditions with different speed requirements, and the application range is wide.
The second case is: when leakage exists in a hydraulic system or pressure is insufficient, oil needs to be supplemented through an oil supplementing system, so that oil is absorbed from an oil supplementing tank 16 through an oil supplementing pump 13, the oil supplementing pump 13 is used for guiding oil in the oil supplementing tank 16 into a low-pressure oil circuit area in a main oil circuit, so that oil is supplemented to the hydraulic system in the operation process, and the phenomenon that the variable pump 2 is vacuumed to cause insufficient pressure of the hydraulic system, so that the hydraulic system cannot normally work and noise is generated is avoided.
The third case is: in the running process of the carrying trolley, the oil pressure of a main oil way is suddenly increased due to various reasons, and the initial flow calculated by the variable pump through the control system is slightly larger than a normal value, so that the working of the carrying trolley is ensured; however, when the speed of the actuator is reduced, the flow passing through the actuator is also reduced, and the hydraulic system needs time for receiving a signal to adjust, so that the flow pumped by the variable pump can quickly cause the oil pressure to rise; when the speed of the lifting cylinder is reduced under the action of the one-way speed regulating valve, the flow passing through the lifting cylinder is reduced, and the flow passing through the variable pump is unchanged, so that the oil pressure is increased; when the carrying trolley stops due to external reasons or is accidentally locked, the hydraulic system receives signals to adjust the flow and takes time, so that the variable pump can continue to supply the flow and can also quickly cause the rise of the oil pressure, and therefore, the oil pressure can be raised due to the multiple reasons, for the protection of the hydraulic system, when the oil pressure value of a main oil way is greater than the pressure setting values of the first pressure reduction overflow valve 8 and the second pressure reduction overflow valve 9, the second pressure reduction overflow valve 9 and the first pressure reduction overflow valve 8 on an oil supplementing branch are automatically opened under the action of high oil pressure, high-pressure oil passes through the first pressure reduction overflow valve 8 and the second pressure reduction overflow valve 9 and then flows into the oil supplementing tank 16 through an oil supplementing return way, so that the oil pressure on the main oil inlet way is adjusted, the whole hydraulic system works stably, the hydraulic system is ensured not to be damaged, and the pressure setting values of the first pressure reduction overflow valve 8 and the second pressure reduction overflow valve 9 are greater than, therefore, the oil-supplementing overflow valve 23 does not have a blocking effect on passing oil; wherein, first decompression overflow valve 8's regulation intensity is limited, and in order to accelerate the pressure release speed of main oil circuit, second decompression overflow valve 9 and first decompression overflow valve 8 simultaneous working to ensure that hydraulic system does not receive the damage, and second decompression overflow valve 9's special setting especially, especially for the safety of protection hydraulic cylinder 4, through second decompression overflow valve 9, can assist the regulation and control to the oil pressure of main oil circuit, improved hydraulic system's oil pressure regulation and control efficiency. Therefore, the oil supplementing system can supplement oil for the closed hydraulic system and also can receive oil returned by overflow of the hydraulic system, and stability and safety of the hydraulic system are kept.
Finally, it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that, while the invention has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The garage carrying trolley hydraulic system driving method is characterized in that: the garage carrying trolley is driven to run by a hydraulic system, wherein the clamping and fixing of the wheels of the vehicle to be carried are realized by controlling the rotation of the clamping arms through the swinging cylinders, the up-and-down lifting of the frame on the carrying trolley is realized by the driving of the lifting cylinders, the forward and backward movement of the carrying trolley is realized by the driving of the traveling motor, and the forward and backward rotation of the clamping arms, the up-and-down lifting of the lifting cylinders and the forward and backward movement of the trolley are respectively realized by reversing valves connected to the hydraulic system; the driving speeds of the walking motor, the lifting cylinder and the swinging cylinder are controlled by the hydraulic system flow, and the driving loads of the walking motor, the lifting cylinder and the swinging cylinder are controlled by the hydraulic system pressure; the driving load is the weight of the vehicle carried by the carrying trolley.
2. The garage handling cart hydraulic system drive method of claim 1, further comprising: the hydraulic system comprises a variable pump, a motor and an execution assembly of a carrying trolley, wherein the motor is connected with the variable pump, an output oil port of the variable pump is connected with a main oil inlet path, an input oil port of the variable pump is connected with a main oil return path, and the main oil inlet path and the main oil return path form a closed main oil path; the execution assembly is connected to the main oil circuit; the method is characterized in that: the main oil circuit is internally provided with an adjusting mechanism for automatically adjusting the flow entering the execution assembly, the adjusting mechanism comprises a shuttle valve, an electromagnetic servo valve and a hydraulic cylinder, wherein two input ends of the shuttle valve are respectively connected with the main oil inlet circuit and the main oil return circuit, the output end of the shuttle valve is connected with the input end of the electromagnetic servo valve, two output ends of the electromagnetic servo valve are respectively correspondingly connected with two cavities at two sides of a piston of the hydraulic cylinder, a piston rod of the hydraulic cylinder is connected with a gear adjusting rod of the variable pump, the electromagnetic servo valve receives an electric signal and correspondingly adjusts the position of a piston plate of the hydraulic cylinder by adjusting the oil amount entering the two cavities of the hydraulic cylinder, so that the piston rod moves to pull the adjusting rod on the variable pump to adjust the output flow of the variable pump to meet the operation demand speed of the execution assembly, and the adjusting mechanism further comprises a control system for.
3. The garage handling cart hydraulic system drive method of claim 2, wherein: the hydraulic system is internally provided with an oil supplementing system for supplementing oil to a main oil way, the oil supplementing system comprises an oil supplementing tank, an oil supplementing pump and an oil supplementing loop, the oil supplementing loop comprises an oil supplementing inlet way and an oil supplementing return way, an oil return port of the oil supplementing tank is communicated with the oil supplementing return way, an oil outlet of the oil supplementing tank is connected with a stop valve for controlling the on-off of the oil supplementing tank, the output end of the stop valve is connected with the input end of the oil supplementing pump, and the output end of the oil supplementing pump is connected with a first one-way valve for preventing oil in the oil supplementing; the oil supplementing pump is used for guiding oil in the oil supplementing tank into a low-pressure oil circuit area in the main oil circuit so as to supplement oil for the hydraulic system; the oil supply device is characterized in that an oil supplementing branch is connected between the main oil inlet path and the main oil return path in parallel, two second one-way valves are connected to the oil supplementing branch, the output ends of the two second one-way valves are arranged in a back-to-back mode, and the oil supplementing path is connected to the oil supplementing branch and located between the two second one-way valves.
4. The garage handling cart hydraulic system drive method of claim 3, wherein: and an oil supplementing overflow valve is also connected in series on the oil supplementing return path of the oil supplementing tank.
5. The garage handling cart hydraulic system drive method of claim 3, wherein: still including the strainer valve among the oil supplementing system, the strainer valve is connected and is set up between stop valve output and oil supplementing pump input.
6. The garage handling cart hydraulic system drive method of claim 3, wherein: and a first pressure reducing overflow valve is respectively connected in parallel between two ends of the two second one-way valves on the oil supplementing branch, the input port of the first pressure reducing overflow valve is connected with the output end of the corresponding second one-way valve, the output port of the first pressure reducing overflow valve is connected on the oil supplementing branch between the two second one-way valves, and the pressure setting value of the first pressure reducing overflow valve is greater than that of the oil supplementing overflow valve.
7. The garage handling cart hydraulic system drive method of claim 6, further comprising: the output end of the shuttle valve is also connected with a second pressure reduction overflow valve, the output end of the second pressure reduction overflow valve is connected with an oil return port of the oil supplementing tank so as to drain oil entering the shuttle valve into the oil supplementing tank to protect the hydraulic cylinder, and the pressure setting value of the second pressure reduction overflow valve is equal to that of the first pressure reduction overflow valve.
8. The garage handling cart hydraulic system drive method of claim 2, wherein: the execution assembly comprises a plurality of execution elements which are connected in parallel, each execution element comprises a walking motor, a lifting cylinder and a swinging cylinder, the walking motor is used for driving the carrying trolley to move forwards or backwards, the lifting cylinder is used for driving the frame on the carrying trolley to lift up and down, and the swinging cylinder is used for controlling each group of clamping arms on the frame to clamp or loosen wheels of the vehicle to be stopped; the two walking motors are arranged, the frame of the carrying trolley is divided into a front frame and a rear frame which are independent, and the front frame and the rear frame are correspondingly provided with one walking motor for driving the front frame and the rear frame to move forwards and backwards; the lifting cylinders are arranged in two, and the front frame and the rear frame are respectively provided with one lifting cylinder for lifting the front frame and the rear frame so as to lift the vehicle on the frames; the number of the swing cylinders is four, a front group of clamp arms and a rear group of clamp arms are arranged on the front frame and the rear frame, each group of clamp arms comprises two clamp arms on the left side and the right side of the frame, and each swing cylinder correspondingly acts on one group of clamp arms;
eight reversing valves are connected in parallel between the main oil inlet path and the main oil return path, the reversing valves are three-position four-way reversing valves, the number of the reversing valves is equal to the number of the executing elements, and each reversing valve correspondingly controls one executing element; two input ends of the reversing valve are respectively connected with the main oil inlet and the oil inlet in the execution element, two output ends of the reversing valve are respectively connected with the main oil return path and the oil return port in the execution element to form a closed loop, and corresponding appointed movement in the execution assembly is completed by reversing the reversing valve.
9. The garage handling cart hydraulic system drive method of claim 8, further comprising: and a one-way speed regulating valve and a hydraulic control one-way valve are connected between the input end of the lifting cylinder and the corresponding reversing valve, and the input end of the hydraulic control one-way valve is also connected with the output end of the lifting cylinder so as to support the load of the frame through the hydraulic control one-way valve.
10. The garage handling cart hydraulic system drive method of claim 8, further comprising: an overflow branch is connected in parallel between the two ends of the walking motor, two third one-way valves are arranged on the overflow branch, the output ends of the two third one-way valves are arranged in opposite directions, a third overflow valve is connected between the two third one-way valves on the overflow branch, and the outlet end of the third overflow valve is connected with an oil supplementing tank.
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| CN201911378396.2A CN111022397A (en) | 2019-12-27 | 2019-12-27 | Garage carrying trolley hydraulic system driving method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112780089A (en) * | 2021-01-26 | 2021-05-11 | 湖北泊都智能科技有限公司 | Plane moving carrier |
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Application publication date: 20200417 |