CN110862047A - Hydraulic control device and method for explosion-proof synchronous circuit for elevator - Google Patents
Hydraulic control device and method for explosion-proof synchronous circuit for elevator Download PDFInfo
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- CN110862047A CN110862047A CN201911139729.6A CN201911139729A CN110862047A CN 110862047 A CN110862047 A CN 110862047A CN 201911139729 A CN201911139729 A CN 201911139729A CN 110862047 A CN110862047 A CN 110862047A
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- oil
- valve
- way reversing
- hydraulic
- reversing valve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
- B66F7/08—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement hydraulically or pneumatically operated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/28—Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions
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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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
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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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/01—Locking-valves or other detent i.e. load-holding devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/027—Check valves
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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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/007—Overload
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/72—Output members, e.g. hydraulic motors or cylinders or control therefor having locking means
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/75—Control of speed of the output member
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
- F15B2211/8636—Circuit failure, e.g. valve or hose failure
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Analytical Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Types And Forms Of Lifts (AREA)
- Fluid-Pressure Circuits (AREA)
- Elevator Control (AREA)
Abstract
The invention relates to a hydraulic control device of an explosion-proof synchronous loop for an elevator, which comprises an oil tank (1), wherein the oil tank (1) is sequentially connected with a gear pump (3), a one-way valve (5) and a three-position four-way reversing valve (6), a first working port of the three-position four-way reversing valve (6) is connected with a right hydraulic control port of a hydraulic control hydraulic lock (7), the right hydraulic control port of the hydraulic control hydraulic lock (7) is sequentially connected with a first throttling valve (8), a two-position two-way reversing valve (10) and a double-acting oil cylinder (11), an upper cavity of the double-acting air cylinder (11) is connected with a second throttling valve (9), the second throttling valve (9) is connected with a left hydraulic control port of the hydraulic control hydraulic lock (7), the left hydraulic control port of the hydraulic control hydraulic lock (7) is connected with a second working port of the three-position four-way reversing valve (. The invention has the advantages of realizing the speed regulation, the stay, the overload protection, the power-off protection and the explosion protection of the elevator, along with simple structure, convenient realization and improved safety.
Description
Technical Field
The invention relates to the technical field of hydraulic pressure of hydraulic elevators, in particular to a hydraulic control device and method of an explosion-proof synchronous circuit for an elevator.
Background
The hydraulic elevator is a hoisting machine widely used in municipal engineering, storage transportation and factory production, and mainly comprises a chassis, a scissor fork supporting arm, a hydraulic device, a method and a workbench. The hydraulic device and the method are core units of the lifter, are used for realizing the ascending, descending, speed regulation, stopping, overload protection and the like of the lifting platform, and have the requirements of simple structure, high efficiency, stable operation and reliable work.
Along with the progress of society, people pay more and more attention to the safety requirement, the hydraulic device and the method only provide overload protection and cannot meet the requirement, under the general condition, when the hydraulic elevator is powered off suddenly during the work of a load, or when an oil cylinder of the hydraulic elevator breaks, a loaded working table surface can descend due to the fact that the hydraulic device and the method cannot provide protection in time, and certain potential safety hazards are caused, so that the hydraulic device and the method need to develop more safety protection functions.
Disclosure of Invention
The invention aims to solve the problems that the existing hydraulic system is low in safety and cannot simultaneously meet the requirements of overload, power-off and explosion protection, and provides an explosion-proof synchronous loop hydraulic control device for an elevator, which not only can realize the functions of ascending, descending, speed regulation and stopping of an elevator platform, but also can provide overload protection, power-off protection and explosion-proof protection, and has a simple structure and low cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hydraulic control device of an explosion-proof synchronous loop for an elevator comprises an oil tank, a gear pump, a one-way valve, a three-position four-way reversing valve, a hydraulic control hydraulic lock, a throttle valve, a two-position two-way reversing valve and a double-acting oil cylinder, wherein the oil tank is connected with an oil suction port of the gear pump through a pipeline, the gear pump is connected with a motor, a filter for filtering hydraulic oil impurities is arranged on the pipeline between the oil tank and the gear pump, an oil outlet of the gear pump is connected with an oil inlet of the one-way valve through a pipeline, an oil outlet of the one-way valve is connected with an oil inlet of the three-position four-way reversing valve through a pipeline, a first working port of the three-position four-way reversing valve is connected with a right hydraulic control port of the hydraulic control hydraulic lock, a second working port of the three-position four-way reversing valve is, the two-position two-way reversing valve is connected with the lower parts of the first double-acting oil cylinder and the second double-acting air cylinder through pipelines respectively, the upper parts of the first double-acting air cylinder and the second double-acting air cylinder are connected with a second throttling valve through pipelines respectively, and the second throttling valve is connected with a left-position hydraulic control port of the hydraulic control hydraulic lock through a pipeline;
the piston rod ends of the two double-acting cylinders are connected with a connecting rod used for being connected with an external device.
Furthermore, an overflow pipe is connected with a pipeline between the gear pump and the one-way valve, an overflow valve is arranged on the overflow pipe, and an outlet of the overflow valve is connected with the oil tank through a pipeline.
In order to further achieve the aim of the invention, the invention also provides a hydraulic control method of the explosion-proof synchronous circuit for the elevator, the used device comprises an oil tank, a gear pump, a one-way valve, a three-position four-way reversing valve, a hydraulic control hydraulic lock, a first throttle valve, a second throttle valve, a two-position two-way reversing valve and a double-acting oil cylinder, and the method specifically comprises the following steps:
(1) when the elevator needs to ascend, the electric control three-position four-way reversing valve is positioned at the rightmost side, the two-position two-way reversing valve is positioned in a passage state, at the moment, the motor drives the gear pump to absorb oil from the oil tank, hydraulic oil enters the one-way valve through the gear pump and then flows into the three-position four-way reversing valve through a pipeline, flows to a right hydraulic control port of the hydraulic control hydraulic lock from a first working port of the three-position four-way reversing valve, then sequentially enters a lower cavity of the double-acting oil cylinder through the first throttling valve and the two-position two-way reversing valve, and drives a;
(2) meanwhile, the upper cavity of the double-acting oil cylinder is extruded, so that the hydraulic oil is discharged to the second throttle valve from the upper cavity, flows to the three-position four-way reversing valve through a left-position hydraulic control port of the hydraulic control hydraulic lock, and finally flows back to the oil tank through a second working port of the three-position four-way reversing valve to complete a rising loop;
(3) when the elevator needs to descend, the electric control three-position four-way reversing valve is positioned at the leftmost side and the two-position
The two-way reversing valve is in a passage state, at the moment, the motor drives the gear pump to absorb oil from the oil tank, hydraulic oil enters the one-way valve through the gear pump and then flows into the three-position four-way reversing valve through a pipeline, flows to a left-position hydraulic control port of the hydraulic control hydraulic lock from a second working port of the three-position four-way reversing valve and then flows into an upper cavity of the double-acting oil cylinder through a second throttling valve to drive a piston in the double-acting oil cylinder to move downwards;
(4) meanwhile, the lower cavity of the double-acting oil cylinder is extruded, so that hydraulic oil is discharged from the lower cavity, sequentially flows through the two-position two-way reversing valve, the first throttle valve and the hydraulic control hydraulic lock, flows to the three-position four-way reversing valve through a right-position hydraulic control port of the hydraulic control hydraulic lock, and finally flows back to the oil tank through a first working port of the three-position four-way reversing valve to complete a descending loop;
(5) when the elevator needs to stay, the three-position four-way reversing valve is controlled by the electric control to be in the middle position, the two-position two-way reversing valve is in the open circuit state, the oil way is disconnected at the moment, and hydraulic oil is kept in the double-acting oil cylinder, so that the elevator is in the stay state;
(6) when the elevator needs power-off protection, the two-position two-way reversing valve is powered off, the valve block is pushed to an open circuit state under the action of the spring, so that an oil circuit is disconnected, the motor is powered off, the gear pump stops oil absorption work, a hydraulic control hydraulic lock is opened, and double open circuit protection is realized;
(7) when the elevator rises and needs to regulate speed, hydraulic oil is discharged to the second throttling valve from the upper cavity, and the flow passing through the second throttling valve is regulated at the moment, so that the oil quantity of the discharged hydraulic oil is controlled, and the function of rising and speed regulation is realized;
(8) when the elevator descends and needs to adjust speed, hydraulic oil is discharged from the lower cavity and flows to the first throttling valve through the two-position two-way reversing valve, and the flow passing through the first throttling valve is adjusted at the moment, so that the oil quantity of the discharged hydraulic oil is controlled, and the function of descending and speed adjusting is realized;
(9) when the oil pipe bursts, the two-position two-way reversing valve is in an open circuit state, so that the hydraulic oil is locked in a lower cavity of the double-acting oil cylinder, and the explosion-proof protection function is achieved.
Further, when the elevator needs overload protection, an oil path is additionally arranged on a pipeline between the gear pump and the one-way valve, an overflow valve is arranged on the oil path, the working critical pressure of the overflow valve is adjusted, when the system pressure is smaller than the working critical pressure, the overflow valve is in an open circuit state, the system normally operates, when the system pressure is larger than the working critical pressure, the overflow valve is in a passage state, hydraulic oil does not pass through the one-way valve any more, and the hydraulic oil is redirected to flow into an oil tank through the overflow valve, so that the overload protection function is realized;
in the technical scheme of the invention, the ascending, descending, speed regulation, stopping, overload protection, power-off protection and explosion protection of the elevator are realized through a whole set of hydraulic control system, the structure is simple, the realization is convenient, and the safety of the hydraulic control system is improved.
Drawings
FIG. 1 is a schematic structural diagram of a hydraulic control device of an explosion-proof synchronous circuit for an elevator according to the present invention;
FIG. 2 is a schematic diagram of the hydraulic control of the present invention operating when extended;
FIG. 3 is a schematic diagram of the operation of the hydraulic control of the present invention during compression;
fig. 4 is a schematic structural diagram of the hydraulic control apparatus of the present invention when not operating.
Detailed Description
Example 1
In order to make the present invention more clear, the hydraulic control apparatus and method of an explosion-proof synchronous circuit for an elevator of the present invention will be further described with reference to the accompanying drawings, and the embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.
Referring to fig. 1, a hydraulic control device of an explosion-proof synchronous circuit for an elevator comprises an oil tank 1, and is characterized in that:
the oil tank 1 is connected with an oil suction port of the gear pump 3 through a pipeline, the gear pump 3 is connected with a motor 4, a filter 2 for filtering hydraulic oil impurities is arranged on the pipeline between the oil tank 1 and the gear pump 3, an oil outlet of the gear pump 3 is connected with an oil inlet of a one-way valve 5 through a pipeline, an oil outlet of the one-way valve 5 is connected with an oil inlet of a three-position four-way reversing valve 6 through a pipeline, a first working port of the three-position four-way reversing valve 6 is connected with a right hydraulic control port of a hydraulic control hydraulic lock 7, the right hydraulic control port of the hydraulic control hydraulic lock 7 is connected with a first throttle valve 8 through a pipeline, the first throttle valve 8 is respectively connected with a first two-position two-way reversing valve 10a and a second two-position two-way reversing valve 10b through pipelines, the first two-position two-way reversing valve 10a is connected with a lower cavity of a first double-acting oil, the upper cavities of the first double-acting cylinder 11a and the second double-acting cylinder 11b are respectively connected with a second throttle valve 9 through pipelines, the second throttle valve 9 is connected with a left hydraulic control port of the hydraulic control hydraulic lock 7 through a pipeline, the left hydraulic control port of the hydraulic control hydraulic lock 7 is connected with a second working port of the three-position four-way reversing valve 6, and the three-position four-way reversing valve 6 is connected with the oil tank 1 through a pipeline;
the piston rod ends of the first double-acting oil cylinder 11a and the second double-acting air cylinder 11b are connected with a connecting rod 12 used for being connected with an external device;
an overflow pipe 13 is connected with a pipeline between the gear pump 3 and the one-way valve 5, an overflow valve 14 is arranged on the overflow pipe 13, and the outlet of the overflow valve 14 is connected with the oil tank 1 through a pipeline.
The invention also provides a hydraulic control method of the explosion-proof synchronous circuit for the elevator, the used device comprises an oil tank, a gear pump, a one-way valve, a three-position four-way reversing valve, a hydraulic control hydraulic lock, a first throttling valve, a second throttling valve, a two-position two-way reversing valve and a double-acting oil cylinder, and the hydraulic control method is characterized by comprising the following steps:
(1) when the elevator needs to ascend, the electric control three-position four-way reversing valve 6 is positioned at the rightmost side, the first two-position two-way reversing valve 10a and the second two-position two-way reversing valve 10b are positioned in a passage state, at the moment, the motor 4 drives the gear pump 3 to suck oil from the oil tank 1, hydraulic oil enters the one-way valve 5 through the gear pump 3 and then flows into the three-position four-way reversing valve 6 through a pipeline, flows to the right hydraulic control port of the hydraulic control hydraulic lock 7 from the first working port of the three-position four-way reversing valve 6, then respectively enters the first two-position two-way reversing valve 10a and the second two-position two-way reversing valve 10b through the first throttle valve 8, the hydraulic oil entering the first two-position two-way reversing valve 10a flows into the lower cavity of the first double-acting oil cylinder 11a, the hydraulic oil entering the second two-position two-way reversing valve 10b, driving the upper connecting rod 12 to move upwards together;
(2) meanwhile, the upper chambers of the first two-position two-way reversing valve 10a and the second two-position two-way reversing valve 10b are squeezed, so that the hydraulic oil is discharged to the second throttle valve 9 from the upper chambers, flows to the three-position four-way reversing valve 6 through a left-position hydraulic control port of the hydraulic control hydraulic lock 7, and finally flows back to the oil tank 1 through a second working port of the three-position four-way reversing valve 6 to complete an ascending loop;
(3) when the elevator needs to descend, the three-position four-way reversing valve 6 is controlled to be positioned at the leftmost side by an electric control, the first two-position two-way reversing valve 10a and the second two-position two-way reversing valve 10b are in a passage state, at the moment, the motor 4 drives the gear pump 3 to suck oil from the oil tank 1, hydraulic oil enters the one-way valve 5 through the gear pump 3 and flows into the three-position four-way reversing valve 6 through a pipeline, flows to a left-position hydraulic control port of the hydraulic control hydraulic lock 7 from a second working port of the three-position four-way reversing valve 6, then flows into upper chambers of the first double-acting oil cylinder 11a and the second double-acting oil cylinder 11b through the second throttle valve 9, and drives pistons in the two double-acting;
(4) meanwhile, the lower cavities of the first double-acting oil cylinder 11a and the second double-acting oil cylinder 11b are extruded, so that hydraulic oil is discharged from the lower cavities, flows into the first two-position two-way reversing valve 10a and the second two-position two-way reversing valve 10b respectively, then sequentially flows through the first throttle valve 8 and the hydraulic control hydraulic lock 7, flows to the three-position four-way reversing valve 6 through the right-position hydraulic control port of the hydraulic control hydraulic lock 7, and finally flows back to the oil tank 1 through the first working port of the three-position four-way reversing valve 6, and a descending loop is completed;
(5) when the elevator needs to stay, the electric control three-position four-way reversing valve 6 is in a middle position, the first two-position two-way reversing valve 10a and the second two-position two-way reversing valve 10b are in an open circuit state, at the moment, an oil way is disconnected, and hydraulic oil is reserved in the first double-acting oil cylinder 11a and the second double-acting oil cylinder 11b, so that the elevator is in a stay state;
(6) when the elevator needs power-off protection, the first two-position two-way reversing valve 10a and the second two-position two-way reversing valve 10b lose power, the valve block is pushed to an open circuit state under the action of the spring, so that an oil circuit is disconnected, meanwhile, the motor 4 is powered off, the gear pump 3 stops oil absorption work, so that the hydraulic control hydraulic lock 7 is opened, and double open circuit protection is realized;
(7) when the elevator rises and needs to adjust speed, hydraulic oil is discharged to the second throttling valve 9 from the upper cavity, and the passing flow of the second throttling valve 9 is adjusted at the moment, so that the oil quantity of the discharged hydraulic oil is controlled, and the function of rising and speed adjusting is realized;
(8) when the elevator descends and needs to adjust speed, hydraulic oil is discharged from the lower cavity and flows to the first throttling valve 8 through the first two-position two-way reversing valve 10a and the second two-position two-way reversing valve 10b, and the flow passing through the first throttling valve 8 is adjusted at the moment, so that the oil quantity of the discharged hydraulic oil is controlled, and the function of descending and speed adjustment is realized;
(9) when the elevator needs overload protection, an oil path is additionally arranged on a pipeline between the gear pump 3 and the one-way valve 5, an overflow valve 14 is arranged on the oil path, the working critical pressure of the overflow valve 14 is adjusted, when the system pressure is smaller than the working critical pressure, the overflow valve 14 is in an open circuit state, the system normally operates, when the system pressure is larger than the working critical pressure, the overflow valve 14 is in a passage state, hydraulic oil does not pass through the one-way valve 5 any more, and the hydraulic oil is redirected to flow into the oil tank 1 through the overflow valve 14, so that the overload protection function is realized;
(10a) when an oil pipe bursts, the first two-position two-way reversing valve 10a and the second two-position two-way reversing valve 10b are in an open circuit state, so that hydraulic oil is locked in lower cavities of the first double-acting oil cylinder 11a and the second double-acting oil cylinder 11b, and the explosion-proof protection function is achieved.
The invention has low cost and simple manufacture, realizes the ascending, descending, speed regulation, staying, overload protection, power-off protection and explosion protection of the elevator, has simple structure and convenient realization, and improves the safety of a hydraulic control system.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (5)
1. The utility model provides an explosion-proof synchronization circuit's hydraulic control device for lift, includes oil tank (1), its characterized in that:
the oil tank (1) is connected with an oil suction port of the gear pump (3), the gear pump (3) is connected with a motor (4), an oil outlet of the gear pump (3) is connected with an oil inlet of a one-way valve (5), an oil outlet of the one-way valve (5) is connected with an oil inlet of a three-position four-way reversing valve (6), a first working port of the three-position four-way reversing valve (6) is connected with a right-position hydraulic control port of a hydraulic control hydraulic lock (7), a right-position hydraulic control port of the hydraulic control hydraulic lock (7) is connected with a first throttle valve (8), the first throttle valve (8) is connected with a two-position two-way reversing valve (10), the two-position two-way reversing valve (10) is connected with a lower cavity of a double-acting oil cylinder (11), an upper cavity of the double-acting air cylinder (11) is connected with a second throttle valve (9), the second throttle valve (9) is connected with a left-position hydraulic control port of the hydraulic, the oil return port of the three-position four-way reversing valve (6) is connected with the oil tank (1);
the piston rod end of the double-acting oil cylinder (11) is connected with a connecting rod (14), and a filter (2) is arranged on a pipeline between the oil tank (1) and the gear pump (3).
2. The hydraulic control apparatus of an explosion-proof synchronous circuit for an elevator according to claim 1, characterized in that:
an overflow pipe (13) is connected to a pipeline between the gear pump (3) and the check valve (5), an overflow valve (16) is arranged on the overflow pipe (13), and an outlet of the overflow valve (16) is connected with the oil tank (1).
3. The hydraulic control apparatus of an explosion-proof synchronous circuit for elevators according to claim 1 or 2, characterized in that:
the two-position two-way reversing valves (10) are arranged in parallel to form two, and the corresponding double-acting cylinders (11) are arranged in parallel to form two.
4. A method of hydraulic control using the hydraulic control apparatus according to claim 1, characterized by comprising the steps of:
the method comprises the following steps: when the elevator needs to ascend, the electric control three-position four-way reversing valve (6) is positioned at the rightmost side, the two-position two-way reversing valve (10) is positioned in a passage state, the motor (4) drives the gear pump (3) to absorb oil from the oil tank (1), hydraulic oil enters the one-way valve (5) through the gear pump (3) and then flows into the three-position four-way reversing valve (6) through a pipeline, flows to the right hydraulic control port of the hydraulic control hydraulic lock (7) from the first working port of the three-position four-way reversing valve (6), then sequentially passes through the first throttling valve (8) and the two-position two-way reversing valve (10) to enter the lower cavity of the double-acting oil cylinder (11), drives a piston in the double-acting oil cylinder (11) to move upwards, simultaneously, the upper cavity of the double-acting oil cylinder (11) is extruded, so that the hydraulic oil is discharged to the second throttling valve (9) from the, finally, the oil flows back into the oil tank (1) through a second working port of the three-position four-way reversing valve (6) to complete an ascending loop;
step two: when the elevator needs to descend, the three-position four-way reversing valve (6) is controlled to be positioned at the leftmost side by an electric control, the two-position two-way reversing valve (10) is positioned in a passage state, at the moment, the motor (4) drives the gear pump (3) to absorb oil from the oil tank (1), hydraulic oil enters the one-way valve (5) through the gear pump (3) and then flows into the three-position four-way reversing valve (6) through a pipeline, flows to the left hydraulic control port of the hydraulic control hydraulic lock (7) through the second working port of the three-position four-way reversing valve (6), then flows into the upper chamber of the double-acting oil cylinder (11) through the second throttling valve (9) to drive the piston in the double-acting oil cylinder (11) to move downwards, meanwhile, the lower chamber of the double-acting oil cylinder (11) is extruded, so that the hydraulic oil is discharged from the lower chamber, sequentially flows through the two-position two-way reversing valve (10), the first throttling valve (8), finally, the oil flows back into the oil tank (1) through a first working port of the three-position four-way reversing valve (6) to complete a descending loop;
step three: when the elevator needs to stay, the electric control three-position four-way reversing valve (6) is in the middle position, the two-position two-way reversing valve (10) is in the open circuit state, the oil way is disconnected at the moment, and hydraulic oil is reserved in the double-acting oil cylinder (11) to enable the elevator to stay;
step four: when the elevator needs power-off protection, the two-position two-way reversing valve (10) is powered off to disconnect an oil way, the motor (4) is powered off, the gear pump (3) stops oil absorption work, the hydraulic control hydraulic lock (7) is opened, and double-open protection is completed;
step five: when the elevator rises and needs speed regulation, hydraulic oil is discharged to the second throttling valve (9) from the upper cavity of the double-acting oil cylinder (11), the passing flow of the second throttling valve (9) is regulated at the moment, the oil quantity of the discharged hydraulic oil is controlled, and rising speed regulation is completed;
step six: when the elevator descends and needs speed regulation, hydraulic oil is discharged from a lower cavity of the double-acting oil cylinder (11) and flows to the first throttling valve (8) through the two-position two-way reversing valve (10), the passing flow of the first throttling valve (8) is regulated at the moment, the oil quantity of the discharged hydraulic oil is controlled, and descending speed regulation is completed;
step seven: when an oil pipe bursts, the two-position two-way reversing valve (10) is in an open circuit state, so that hydraulic oil is locked in a lower cavity of the double-acting oil cylinder (11), and explosion-proof protection is completed.
5. The hydraulic control method according to claim 4, characterized in that:
when the elevator needs overload protection, an overflow pipe (13) is additionally arranged on a pipeline between the gear pump (3) and the check valve (5), an overflow valve (14) is arranged on the overflow pipe (13), the working critical pressure of the overflow valve (14) is adjusted, when the system pressure is larger than the working critical pressure, the overflow valve (14) is in a passage state, hydraulic oil is redirected to flow into an oil tank through the overflow valve (14), and the overload protection is completed.
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