阅读说明：本技术 一种剪叉式高空作业平台片式多路换向阀及具有该阀的液压系统 (Scissor-fork type aerial work platform sheet type multi-way reversing valve and hydraulic system with same ) 是由 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 于 2020-07-07 设计创作，主要内容包括：本发明涉及一种剪叉式高空作业平台片式多路换向阀及具有该阀的液压系统,片式多路换向阀包括三位四通O型阀芯的第一联电磁换向阀、三位四通Y型阀芯的第二联电磁换向阀、三位四通Y型阀芯的第三联电磁换向阀和两位四通第四联电磁换向阀,第一联电磁换向阀用于向转向油路供油,第二联电磁换向阀用于向行走制动油路或举升油路供油,第三联电磁换向阀用于行走油路供油,第四联电磁换向阀用于控制行走马达串并联切换,采用首创片多路换向阀结构设计,低速行走平稳、无抖动,刹车解除可靠无异响,行走时突然转弯无顿挫,行走马达无吸空,有效提高爬坡能力和举升行走安全性能,改善停车冲击,进而提高剪叉式高空作业平台的综合性能。(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.)

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.

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.