CN111664272A - Scissor-fork type aerial work platform sheet type multi-way reversing valve and hydraulic system with same - Google Patents

Scissor-fork type aerial work platform sheet type multi-way reversing valve and hydraulic system with same Download PDF

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Publication number
CN111664272A
CN111664272A CN202010645711.XA CN202010645711A CN111664272A CN 111664272 A CN111664272 A CN 111664272A CN 202010645711 A CN202010645711 A CN 202010645711A CN 111664272 A CN111664272 A CN 111664272A
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CN
China
Prior art keywords
oil
valve
way
reversing valve
working port
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Pending
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CN202010645711.XA
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Chinese (zh)
Inventor
朱建辉
齐宏波
孟凡辉
闫可可
张集遥
吕臣
刘衍鑫
魏家礼
张进安
王桂欣
李圣
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Xuzhou Shengnuo Power Transmission Machinery Co ltd
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Xuzhou Shengnuo Power Transmission Machinery Co ltd
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Application filed by Xuzhou Shengnuo Power Transmission Machinery Co ltd filed Critical Xuzhou Shengnuo Power Transmission Machinery Co ltd
Priority to CN202010645711.XA priority Critical patent/CN111664272A/en
Publication of CN111664272A publication Critical patent/CN111664272A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
    • F16K11/20—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members
    • F16K11/22—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members with an actuating member for each valve, e.g. interconnected to form multiple-way valves
    • 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
    • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
    • B66F11/042—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations actuated by lazy-tongs mechanisms or articulated levers
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/027—Check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0603—Multiple-way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
    • F15B2013/0448—Actuation by solenoid and permanent magnet

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

The invention relates to a scissor-type aerial work platform plate-type multi-way reversing valve and a hydraulic system with the valve, wherein the plate-type multi-way reversing valve comprises a first electromagnetic reversing valve with a three-position four-way O-shaped valve core, a second electromagnetic reversing valve with a three-position four-way Y-shaped valve core, a third electromagnetic reversing valve with a three-position four-way Y-shaped valve core and a two-position four-way fourth electromagnetic reversing valve, the first electromagnetic reversing valve is used for supplying oil to a steering oil way, the second electromagnetic reversing valve is used for supplying oil to a walking brake oil way or a lifting oil way, the third electromagnetic reversing valve is used for supplying oil to a walking oil way, the fourth electromagnetic reversing valve is used for controlling the serial-parallel switching of walking motors, the structural design of the plate-type multi-way reversing valve is adopted, the walking is stable and free from shaking at low speed, the brake is reliable and free from abnormal sound when the walking is carried out, the walking is free from being stopped when the walking is, the parking impact is improved, and the comprehensive performance of the scissor-type aerial work platform is further improved.

Description

Scissor-fork type aerial work platform sheet type multi-way reversing valve and hydraulic system with same
Technical Field
The invention relates to a scissor type aerial work platform sheet type multi-way reversing valve and a hydraulic system with the same, and belongs to the field of aerial work.
Background
A scissor-fork type aerial work platform is special equipment for aerial work with wide application. The scissor fork mechanical structure enables the lifting platform to lift, has higher stability, a wide operation platform and higher bearing capacity, enables the range of high-altitude operation to be larger, is suitable for simultaneous operation of multiple persons, can control the machine to lift and walk without descending the lifting platform by using personnel, and can control equipment to travel to other work places on the table board. The equipment has the functions of walking and steering driving, does not need manual traction and does not need an external power supply. The movable high-altitude operation device is flexible and convenient to move, enables high-altitude operation to be more convenient and faster, and is an ideal high-altitude operation device for high-efficiency and safe production of modern enterprises.
The steering, walking, braking and lifting actions of the scissor type aerial work platform are carried out or controlled by power through a hydraulic system and a multi-way reversing valve. At present, according to market feedback information, a hydraulic system of the scissor-type aerial work platform has the following defects:
1. the multi-way reversing valve adopts a cartridge valve design, and once a valve block is damaged or has a problem during processing, the whole valve block is scrapped; 2. climbing is weak; 3. low speed walking dithering; 4. vehicle speed is not controlled when going downhill; 5. when the load is too low, the brake can not be released, and abnormal sound is generated; 6. when walking, the bicycle turns suddenly and is subjected to jerking; 7. when the vehicle runs, the handle is suddenly loosened, and the vehicle parking impact is large; 8. the walking motor has suction.
Due to the defects, the high-altitude operation platform has great potential safety hazard, and the performance of the whole machine needs to be improved, so that a multi-way reversing valve for solving the problems and a hydraulic system applying the valve are urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a scissor-type aerial work platform sheet type multi-way reversing valve and a hydraulic system with the same.
The invention is realized by the following technical scheme:
a scissor-fork type aerial work platform sheet-type multi-way reversing valve is provided with an oil inlet P and an oil return port T, wherein the sheet-type multi-way reversing valve comprises a first electromagnetic reversing valve, a second electromagnetic reversing valve, a third electromagnetic reversing valve and a fourth electromagnetic reversing valve, and further comprises an intermediate oil inlet joint, and the intermediate oil inlet joint is connected with oil ports of the oil inlet P, the first electromagnetic reversing valve, the second electromagnetic reversing valve and the third electromagnetic reversing valve;
the first electromagnetic directional valve is a three-position four-way O-shaped valve core and is connected with the oil inlet P and the oil return port T, the first electromagnetic directional valve is provided with an electromagnet DT1A, an electromagnet DT1B, a working port A1 and a working port B1, a shuttle valve is arranged between the working port A1 and the working port B1, a first overflow valve connected with the oil return port T is arranged in front of or behind the shuttle valve, and first dampers are arranged in front of or behind the working port A1 and the working port B1;
the second solenoid directional control valve is a three-position four-way Y-shaped valve core and is connected with the oil inlet P and the oil return port T, the second solenoid directional control valve is provided with an electromagnet DT2A, an electromagnet DT2B, a working port A2, a working port A3 and an oil port T1, the working port A3 is connected with the oil return port T, the oil port T1 is connected with the oil inlet P and the oil return port T, a second overflow valve and a third overflow valve are respectively arranged between the working port A3 and the oil return port T and between the oil port T1 and the oil inlet P, and a second damper is arranged on the working port A2;
the third electromagnetic directional valve is a three-position four-way Y-shaped valve core and is connected with the oil inlet P and the oil outlet T, the second electromagnetic directional valve is provided with an electromagnet DT3A, an electromagnet DT3B, a working port LFA and a working port RFB, the fourth electromagnetic directional valve is a two-position four-way valve core and is connected with a third electromagnetic valve, and the fourth electromagnetic directional valve is provided with an electromagnet DT4A, a working port RFA and a working port LFB;
the third electromagnetic directional valve is a three-position four-pass band damping Y-shaped valve core or a three-position four-way non-damping Y-shaped valve core, a one-way balance valve is arranged between an oil port of the third electromagnetic directional valve and the oil inlet P and between an oil return port T and the oil return port T, the fourth electromagnetic directional valve is a two-position four-way valve core, two oil ports of the fourth electromagnetic directional valve are respectively connected with the working port LFA and the working port RFB, and an oil supplementing one-way valve is arranged on the third electromagnetic directional valve or the fourth electromagnetic directional valve.
A scissor type aerial work platform hydraulic system with a sheet type multi-way reversing valve comprises an oil tank, a steering oil cylinder, a parking brake cylinder, a lifting oil cylinder and a traveling motor, wherein the oil tank is connected with a hydraulic pump, the steering oil cylinder, the parking brake cylinder and the traveling motor are respectively used for driving a work platform to steer, park brake and travel, the lifting oil cylinder is used for driving a scissor type machine to lift, and the hydraulic pump and the oil tank are respectively connected with an oil inlet P and an oil return port T of the sheet type multi-way reversing valve;
a steering oil way is arranged between the first electromagnetic directional valve and the steering oil cylinder, the first electromagnetic directional valve is used for controlling the sheet type multi-way directional valve to change direction and supplying oil to the steering oil way, and the working port A1 and the working port B1 are communicated with the steering oil way;
a traveling brake oil way and a lifting oil way are arranged between the second solenoid directional valve and the parking brake cylinder and between the second solenoid directional valve and the lifting oil cylinder respectively, the second solenoid directional valve is used for controlling the sheet type multi-way directional valve to change direction and supplying oil to the traveling brake oil way or the lifting oil way, the working port A2 is communicated with the traveling brake oil way, the working port A3 and the oil port T1 are communicated with the lifting oil way, a manual pump is arranged on the traveling brake oil way, and a first lifting control valve and a second lifting control valve are arranged on the lifting oil way;
and a traveling oil way is arranged between the third electromagnetic directional valve and the fourth electromagnetic directional valve and a traveling motor, the third electromagnetic directional valve is used for controlling the sheet type multi-way directional valve to change direction and supply oil to the traveling oil way, the number of the traveling motors is two, the working port LFA and the working port RFA are positioned on two sides of the same traveling motor, the working port LFB and the working port RFB are positioned on two sides of the same traveling motor, the fourth electromagnetic directional valve is used for controlling the series-parallel switching of the traveling motor in the traveling oil way, and a filter is arranged between the oil return port T and the oil tank.
The invention has the beneficial effects that:
(1) by adopting the structural design of the first-created piece multi-way reversing valve, when a certain electromagnetic reversing valve is damaged or has a problem during processing, the specific combination can be disassembled and replaced to ensure the use of the whole multi-way reversing valve, and the specific relative position of each electromagnetic reversing valve can be changed under the condition of not influencing the use performance of the multi-way reversing valve, so that the cost is saved and the application is convenient;
(2) the fourth electromagnetic directional valve and the third electromagnetic directional valve are used in a combined mode, the traveling motor is switched in series and parallel connection through reversing, high-speed traveling and low-speed traveling are switched, and the climbing capacity is effectively improved compared with the prior art;
(3) the steering flow and the walking flow are well matched when the vehicle runs at low speed, the vehicle runs at low speed stably without shaking, the steering speed is controlled by the first damping when the vehicle runs in a lifting state, and the safety performance is greatly improved;
(4) when going downhill, the vehicle speed controls the hydraulic pump through the handle of the operation platform, the oil quantity of the brake oil circuit is controlled, the vehicle speed is further controlled, the handle is suddenly loosened during walking, the brake oil circuit slowly returns oil through the second damping, the vehicle parking impact is obviously improved, the uphill and downhill walking are stably started and stopped, and the potential safety hazard is effectively reduced;
(5) the brake can not be released, and no noise exists;
(6) when walking, the walking stick is suddenly turned without pause and frustration;
(7) when the equipment is steered to walk or is in emergency stop, oil is supplemented to the walking motor through the oil supplementing one-way valve, and the walking motor has no suction phenomenon.
The hydraulic system of the scissor-type aerial work platform adopts the multi-way reversing valve to realize steering, walking braking and relieving, walking, lifting, walking high-speed and low-speed switching and compound actions, and the performance of the scissor-type aerial work platform is obviously improved.
Drawings
FIG. 1 is a structural view of example 1.
FIG. 2 is a structural view of embodiment 2.
Fig. 3 is a perspective view of embodiment 2.
FIG. 4 is a structural view of embodiment 3.
The labels in the figure are: the hydraulic control system comprises a multi-way reversing valve 1, a first electromagnetic directional valve 11, a second electromagnetic directional valve 12, a third electromagnetic directional valve 13, a fourth electromagnetic directional valve 14, an intermediate oil inlet coupler 15, a shuttle valve 2, a first overflow valve 3, a first damper 4, a second overflow valve 5, a third overflow valve 6, a second damper 7, a one-way balance valve 8, an oil supplementing one-way valve 9, an oil tank 10, a steering oil cylinder 17, a parking brake cylinder 18, a lifting oil cylinder 19, a walking motor 20, a hydraulic pump 21, a steering oil way 22, a walking brake oil way 23, a lifting oil way 24, a manual pump 25, a walking oil way 26, a first lifting control valve 27, a second lifting control valve 28 and a filter 29.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings.
Example 1: a scissor-fork type aerial work platform sheet-type multi-way directional control valve is provided with an oil inlet P and an oil return port T, wherein the sheet-type multi-way directional control valve 1 comprises a first electromagnetic directional control valve 11, a second electromagnetic directional control valve 12, a third electromagnetic directional control valve 13 and a fourth electromagnetic directional control valve 14, the sheet-type multi-way directional control valve 1 further comprises an intermediate oil inlet union 15, and the intermediate oil inlet union 15 is connected with oil ports of the oil inlet P, the first electromagnetic directional control valve 11, the second electromagnetic directional control valve 12 and the third electromagnetic directional control valve 13;
the first electromagnetic directional valve 11 is a three-position four-way O-shaped valve core and is connected with an oil inlet P and an oil return port T, the first electromagnetic directional valve 11 is provided with an electromagnet DT1A, an electromagnet DT1B, a working port A1 and a working port B1, a shuttle valve 2 is arranged between the working port A1 and the working port B1, a first overflow valve 3 connected with the oil return port T is arranged in front of the shuttle valve 2 or behind the shuttle valve 2, and first dampers 4 are arranged in front of the working port A1 and the working port B1;
the second solenoid directional control valve 12 is a three-position four-way Y-shaped valve core and is connected with an oil inlet P and an oil return port T, the second solenoid directional control valve 12 is provided with an electromagnet DT2A, an electromagnet DT2B, a working port A2, a working port A3 and an oil port T1, the working port A3 is connected with the oil return port T, the oil port T1 is connected with the oil inlet P and the oil return port T, a second overflow valve 5 and a third overflow valve 6 are respectively arranged between the working port A3 and the oil return port T and between the oil port T1 and the oil inlet P, and a second damper 7 is arranged on the working port A2;
the third electromagnetic directional valve 13 is a three-position four-way Y-shaped valve core and is connected with the oil inlet P and the oil outlet T, the third electromagnetic directional valve 13 is provided with an electromagnet DT3A, an electromagnet DT3B, a working port LFA and a working port RFB, the fourth electromagnetic directional valve 14 is a two-position four-way valve core and is connected with a third electromagnetic valve, and the fourth electromagnetic directional valve 14 is provided with an electromagnet DT4A, a working port RFA and a working port LFB;
the third electromagnetic directional valve 13 is a three-position four-way valve without a damping Y-shaped valve core, a one-way balance valve 8 is arranged between an oil port of the third electromagnetic directional valve 13 and an oil inlet P and an oil return port T, the fourth electromagnetic directional valve 14 is a two-position four-way valve core, two oil ports of the fourth electromagnetic directional valve 14 are respectively connected with a working port LFA and a working port RFB, and an oil supplementing one-way valve 9 is arranged on the third electromagnetic directional valve 13 or the fourth electromagnetic directional valve 14.
Example 2:
example 2 differs from example 1 in that: and a first damper 4 is arranged behind the working port A1 and the working port B1, and the third electromagnetic directional valve 13 is a three-position four-way Y-shaped valve core.
Example 3:
a scissor type aerial work platform hydraulic system with a sheet type multi-way directional valve 1 comprises an oil tank 10, a steering oil cylinder 17, a parking brake cylinder 18, a lifting oil cylinder 19 and a walking motor 20, wherein the oil tank 10 is connected with a hydraulic pump 21, the steering oil cylinder 17, the parking brake cylinder 18 and the walking motor 20 are respectively used for driving a work platform to steer, park brake and walk, the lifting oil cylinder 19 is used for driving a scissor type machine to lift, and the hydraulic pump 21 and the oil tank 10 are respectively connected with an oil inlet P and an oil return port T of the sheet type multi-way directional valve 1 in embodiment 2;
a steering oil way 22 is arranged between the first electromagnetic directional valve 11 and the steering oil cylinder 17, the working port A1 and the working port B1 are communicated with the steering oil way 22, and the first electromagnetic directional valve 11 is used for controlling the chip type multi-way directional valve 1 to change direction and supplying oil to the steering oil way 22;
a walking brake oil way 23 and a lifting oil way 24 are arranged between the second solenoid directional valve 12 and the parking brake cylinder 18 and the lifting oil cylinder 19 respectively, the second solenoid directional valve 12 is used for controlling the sheet type multi-way directional valve 1 to change direction and supplying oil to the walking brake oil way 23 or the lifting oil way 24, the working port A2 is communicated with the walking brake oil way 23, the working port A3 and the oil port T1 are communicated with the lifting oil way 24, a manual pump 25 is arranged on the walking brake oil way 23, and a first lifting control valve 27 and a second lifting control valve 28 are arranged on the lifting oil way 24;
a traveling oil path 26 is arranged between the third electromagnetic directional valve 13 and the fourth electromagnetic directional valve 14 and the traveling motor 20, the third electromagnetic directional valve 13 is used for controlling the sheet type multi-path directional valve 1 to change direction and supplying oil to the traveling oil path 26, the number of the traveling motors 20 is two, the working ports LFA and LFB are positioned on two sides of the same traveling motor 20, the working ports RFA and RFB are positioned on two sides of the same traveling motor 20, the fourth electromagnetic directional valve 14 is used for controlling the series-parallel switching of the traveling motors 20 in the traveling oil path 26, and a filter 29 is arranged between the oil return port T and the oil tank 10.
The multi-way directional valve 1 of embodiment 1 can be applied to the hydraulic system similarly.
The working principle of the invention is as follows:
the chip type multi-way directional valve 1 is set by an electrical system, a valve core is in a middle position when each link is not electrified, an oil inlet P port oil way is cut off, when a certain electromagnet or a plurality of electromagnets are electrified, the chip type multi-way directional valve 1 enables oil in an oil tank 10 to be pumped into the oil inlet P of the chip type multi-way directional valve 1 through a hydraulic pump 21, the oil is guided through an intermediate oil inlet link 15 and is reversed to enter a corresponding execution mechanism, a third overflow valve 6 at the position of the oil inlet P controls the highest pressure of the system, the hydraulic system comprises four action loops of a steering oil way 22, a walking brake oil way 23, a lifting oil way 24 and a walking oil way 26, the hydraulic oil is filtered from an oil return port T through a filter 29 and returns to the oil tank:
(1) steering function of the hydraulic system: the valve linkage of the first electromagnetic directional valve 11 can be a three-position four-way O-shaped valve core with P, T, A, B not communicated, when an electromagnet DT1A or an electromagnet DT1B of the first electromagnetic directional valve 11 is electrified, the sheet type multi-way directional valve 1 is reversed and is communicated with a steering oil way 22 through a working port A1 and a working port B1, oil enters the steering oil cylinder 17, and the steering oil cylinder 17 extends or retracts a piston rod under the action of high-pressure oil to realize the left-turn or right-turn function of the operation platform;
(2) the walking braking and releasing functions of the hydraulic system are as follows: the valve linkage of the second solenoid directional valve 12 can be a three-position four-way Y-shaped valve core communicated with T, A, B, when DT2A of the second solenoid directional valve 12 is electrified, the plate type multi-way directional valve 1 is reversed to enable hydraulic oil to slowly enter a brake cavity of the parking brake cylinder 18 through a brake oil path under the action of a second damper 7, and a working platform is driven to release parking brake; under special conditions, for example, when the high-altitude operation vehicle needs to be moved but the hydraulic and electric systems have faults and the brake cannot be released through the DT2A, the brake can be manually released through the manual pump 25 of the scissor-type high-altitude operation platform, and then the high-altitude operation vehicle is moved through external force;
(3) lifting function of the hydraulic system: the valve linkage of the second solenoid directional valve 12 can be a three-position four-way Y-shaped valve core communicated with T, A, B, the sheet type multi-way valve is set by an electrical system, the electromagnet DT2B is electrified, and other electromagnetic valves are not electrified, so that the safety of the system during lifting is ensured; when DT2B of the second solenoid directional valve 12 is powered on, the plate-type multi-way directional valve 1 is switched to enable hydraulic oil to enter the lifting oil way 24, and the first lifting control valve 27 and the second lifting control valve 28 are used for controlling the flow and the pressure of the lifting oil way 24, so that the lifting oil cylinder 19 drives a scissor machine of the work platform to perform lifting action to lift the work platform;
(4) the walking function of the hydraulic system is as follows: the valve linkage of the third electromagnetic directional valve 13 can be a three-position four-pass-band damping Y-shaped valve core communicated with T, A, B or a Y-shaped valve core without damping, when the electromagnet DT3A or DT3B is electrified, the third electromagnetic directional valve 13 controls the chip type multi-way directional valve 1 to change direction, so that hydraulic oil enters the walking motor 20 through the walking oil way 26, the walking motor 20 rotates forwards or backwards under the action of high-pressure oil, and then the tire of the operation platform is driven to rotate forwards or backwards, and the operation platform moves forwards or backwards;
(5) the high-speed and low-speed switching function of the hydraulic system is as follows: the fourth electromagnetic directional valve 14 is a two-position four-way valve core, when the electromagnet DT4A is powered on or powered off, the two-position four-way valve core is switched to realize the series-parallel switching of the traveling motor 20, and further realize the high-speed and low-speed switching of traveling;
(6) the low-speed walking and steering composite action of the hydraulic system: through the setting of an electrical system, the electromagnet DT1A or the electromagnet DT1B is electrified, the electromagnet DT3A or the electromagnet DT3B is electrified, the DT4A is electrified or deenergized, the specific position of the first damping 4 arranged in front of or behind the working port A1 and the working port B1 is set according to the requirement of steering speed, the flow entering the steering oil cylinder 17 is controlled through proper damping, and further the steering speed is controlled, particularly when the scissors machine is in a lifting state, in the state, due to the setting of the electrical system, the pump flow is small, the scissors machine belongs to low-speed walking, the low-speed walking and steering composite action can be realized through proper damping, and the action is stable and is not suspended.
The invention has the following beneficial effects:
(1) by adopting the structural design of the first-initiated piece multi-way reversing valve 1, when a certain electromagnetic reversing valve is damaged or has a problem during processing, the specific combined protection can be detached and replaced to ensure the use of the whole multi-way reversing valve 1, see the attached drawings 1 or 2, see the attached drawing 3 under the condition of not influencing the use performance of the multi-way reversing valve 1, the specific relative position of each electromagnetic reversing valve can be changed so as to save the cost and facilitate the application, and the scissor-type aerial work platform hydraulic system realizes steering, walking braking and relieving, walking, lifting, walking high-low speed switching and compound actions by applying the multi-way reversing valve 1;
(2) the fourth electromagnetic directional valve 14 and the third electromagnetic directional valve 13 are used together, so that the traveling motor 20 is switched in series and parallel connection in a reversing manner to switch high-speed and low-speed traveling, and the climbing capability is effectively improved compared with the prior art;
(3) steering and walking flow are well matched when the vehicle runs at low speed, the vehicle runs at low speed stably without shaking, and the safety performance is greatly improved when the vehicle runs under a lifting state: the flow entering the steering oil cylinder 17 is controlled through a proper first damper 4, so that the steering speed is controlled, particularly, the scissor-fork machine belongs to low-speed walking and steering composite actions in a lifting state, and the actions are stable and are not interrupted;
(4) when the vehicle goes downhill, the vehicle speed controls the hydraulic pump 21 through the handle of the operation platform, so as to control the vehicle speed, and the larger the handle angle is, the higher the pump rotating speed is, and the larger the flow rate is; when the forklift is in running, the handle is suddenly loosened, namely when DT2A of the second electromagnetic directional valve 12 is powered off, the brake oil path returns oil slowly through the second damper 7 to drive the operation platform to park and brake, namely, the forklift is slowly operated, so that the impact caused by sudden stop of the brake can be prevented, the vehicle parking impact is obviously improved, and the potential safety hazard is effectively reduced;
when the working platform goes up a slope or down a slope, under the action of the one-way balance valve 8, enough outlet pressure of the hydraulic pump 21, brake release pressure and motor return oil back pressure can be established, and walking can be started and stopped stably through the one-way balance valve 8;
the third electromagnetic directional valve 13 selects a three-position four-pass-band damping Y-shaped valve core or a Y-shaped valve core without damping according to the parking speed and the type of the operation platform, the three-position four-pass-band damping Y-shaped valve core machine is selected to be capable of oil mixing, when the equipment stops walking, the walking motor 20 can slowly stop rotating in a damping mode, and therefore the equipment stops slowly and stably;
(5) the third overflow valve 6 at the oil inlet P controls the highest pressure of the system, and the brake can not be released when the load is too low, so that no noise exists; when the electromagnet DT3A or DT3B of the third electromagnetic directional valve 13 is electrified, the electromagnet DT2A of the second electromagnetic directional valve 12 can be electrified at the same time or slightly in a delayed manner, oil enters the one-way balance valve 8, the walking oil path 26 is conducted, and the running oil path 26 is started stably; when the electromagnet DT3A or DT3B of the third combined electromagnetic directional valve 13 loses power, the electromagnet DT2A of the second combined electromagnetic directional valve 12 delays power loss, and the specific logic relationship is to ensure stable starting and stable parking;
(6) when walking, suddenly turn without pause and frustration: the specific position of the first overflow valve 3 in front of the shuttle valve 2 or behind the shuttle valve 2 is set according to the use requirement of steering pressure, and the steering pressure is controlled through the shuttle valve 2 and the first overflow valve 3 during steering to prevent overload;
(7) the shearing fork of the operation platform is stable in mechanical lifting: the working port A3 and the oil port T1 which are communicated with the lifting oil way 24 are provided with a second overflow valve 5 to control lifting pressure so as to prevent overload;
(8) the traveling motor 20 has no suction phenomenon: when the equipment turns to walk or scram, an oil supplementing one-way valve 9 is arranged between a working port RFA and an oil port and an oil return port T of a third electromagnetic directional valve 13, the oil supplementing one-way valve 9 can be positioned on an oil way of the third electromagnetic directional valve 13 or an oil way of a fourth electromagnetic directional valve 14, the use function is not influenced, the oil supplementing one-way valve 9 timely supplements oil to a walking motor 20, and the walking motor 20 is prevented from being damaged due to empty suction;
when the traveling motors 20 are connected in series, the traveling motors 20 can be sucked empty when steering, and the traveling motors 20 are prevented from being damaged due to the fact that the traveling motors 20 are sucked empty through the oil supplementing one-way valves 9 on the working pieces of the third electromagnetic directional valves 13;
therefore, the performance of the scissor-type aerial work platform is obviously improved.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A scissor-fork type aerial work platform sheet-type multi-way reversing valve is provided with an oil inlet P and an oil return port T, and is characterized in that the sheet-type multi-way reversing valve comprises a first electromagnetic reversing valve, a second electromagnetic reversing valve, a third electromagnetic reversing valve and a fourth electromagnetic reversing valve, wherein the first electromagnetic reversing valve is a three-position four-way O-shaped valve core and is connected with the oil inlet P and the oil return port T, the first electromagnetic reversing valve is provided with an electromagnet DT1A, an electromagnet DT1B, a working port A1 and a working port B1, the second electromagnetic reversing valve is a three-position four-way Y-shaped valve core and is connected with the oil inlet P and the oil return port T, and the second electromagnetic reversing valve is provided with an electromagnet DT2A, an electromagnet DT2B, a working port A2, a working port A3 and an oil port T1;
the third electromagnetic directional valve is a three-position four-way Y-shaped valve core and is connected with the oil inlet P and the oil outlet T, the third electromagnetic directional valve is provided with an electromagnet DT3A, an electromagnet DT3B, a working port LFA and a working port RFB, the fourth electromagnetic directional valve is a two-position four-way valve core and is connected with the third electromagnetic valve, and the fourth electromagnetic directional valve is provided with an electromagnet DT4A, a working port RFA and a working port LFB.
2. The scissor type aerial work platform piece type multi-way reversing valve according to claim 1, wherein the piece type multi-way reversing valve further comprises an intermediate oil inlet joint, and the intermediate oil inlet joint is connected with oil ports of the oil inlet P, the first electromagnetic reversing valve, the second electromagnetic reversing valve and the third electromagnetic reversing valve.
3. The scissor type aerial work platform plate type multi-way reversing valve as claimed in claim 1, wherein a shuttle valve is arranged between the working port A1 and the working port B1, and a first overflow valve connected with the oil return port T is arranged in front of or behind the shuttle valve.
4. The scissor type aerial work platform plate type multi-way reversing valve as claimed in claim 1, wherein a first damper is arranged in front of or behind the working port A1 and the working port B1.
5. The scissor type aerial work platform plate type multi-way reversing valve according to claim 1, wherein the working port A3 is connected with an oil return port T, the oil port T1 is connected with an oil inlet P and an oil return port T, and a second overflow valve and a third overflow valve are respectively arranged between the working port A3 and the oil return port T and between the oil port T1 and the oil inlet P.
6. The scissor type aerial work platform plate type multi-way reversing valve as claimed in claim 1, wherein a second damper is arranged on the working port A2.
7. The scissor type aerial work platform plate type multi-way reversing valve as claimed in claim 1, wherein the third electromagnetic reversing valve is a three-position four-pass band damping Y-shaped valve core or a three-position four-way non-damping Y-shaped valve core, a one-way balance valve is arranged between an oil port of the third electromagnetic reversing valve and an oil inlet P and between an oil port of the third electromagnetic reversing valve and an oil return port T, the fourth electromagnetic reversing valve is a two-position four-way valve core, two oil ports of the fourth electromagnetic reversing valve are respectively connected with a working port LFA and a working port RFB, and an oil supplementing one-way valve is arranged on the third electromagnetic reversing valve or the fourth electromagnetic reversing valve.
8. A scissor type aerial work platform hydraulic system with a sheet type multi-way reversing valve comprises an oil tank, a steering oil cylinder, a parking brake cylinder, a lifting oil cylinder and a traveling motor, wherein the oil tank is connected with a hydraulic pump, the steering oil cylinder, the parking brake cylinder and the traveling motor are respectively used for driving a work platform to steer, park brake and travel, the lifting oil cylinder is used for driving a scissor type machine to lift, and the hydraulic pump and the oil tank are respectively connected with an oil inlet P and an oil return port T of the sheet type multi-way reversing valve according to any one of claims 1 to 7;
a steering oil way is arranged between the first electromagnetic directional valve and the steering oil cylinder, the first electromagnetic directional valve is used for controlling the sheet type multi-way directional valve to change direction and supply oil to the steering oil way, a traveling brake oil way and a lifting oil way are arranged between the second electromagnetic directional valve and the parking brake cylinder and between the second electromagnetic directional valve and the lifting oil cylinder respectively, the second electromagnetic directional valve is used for controlling the sheet type multi-way directional valve to change direction and supply oil to the traveling brake oil way or the lifting oil way, traveling oil ways are arranged between the third electromagnetic directional valve and the fourth electromagnetic directional valve and the traveling motor, the third electromagnetic directional valve is used for controlling the sheet type multi-way directional valve to change direction and supply oil to the traveling oil way, and the fourth electromagnetic directional valve is used for controlling the series-parallel switching of the traveling motor in the traveling oil way.
9. The hydraulic system of claim 8, wherein the working port a1 and the working port B1 are in communication with a steering circuit, the working port a2 is in communication with a travel brake circuit, the working port A3 and the working port T1 are in communication with a lift circuit, the number of travel motors is two, the working port LFA and the working port LFB are located on two sides of the same travel motor, and the working port RFA and the working port RFB are located on two sides of the same travel motor.
10. The hydraulic system of the scissor-type aerial work platform with the plate-type multi-way reversing valve according to claim 8, wherein a manual pump is arranged on the walking brake oil way, a first lifting control valve and a second lifting control valve are arranged on the lifting oil way, and a filter is arranged between the oil return port T and an oil tank.
CN202010645711.XA 2020-07-07 2020-07-07 Scissor-fork type aerial work platform sheet type multi-way reversing valve and hydraulic system with same Pending CN111664272A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010645711.XA CN111664272A (en) 2020-07-07 2020-07-07 Scissor-fork type aerial work platform sheet type multi-way reversing valve and hydraulic system with same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010645711.XA CN111664272A (en) 2020-07-07 2020-07-07 Scissor-fork type aerial work platform sheet type multi-way reversing valve and hydraulic system with same

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Publication Number Publication Date
CN111664272A true CN111664272A (en) 2020-09-15

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CN202010645711.XA Pending CN111664272A (en) 2020-07-07 2020-07-07 Scissor-fork type aerial work platform sheet type multi-way reversing valve and hydraulic system with same

Country Status (1)

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CN (1) CN111664272A (en)

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