CN211288294U

CN211288294U - Load-sensitive proportional multi-way valve application system for overhead working truck

Info

Publication number: CN211288294U
Application number: CN201921938611.5U
Authority: CN
Inventors: 郑军
Original assignee: Hangzhou Aichi Engineering Vehicles Co Ltd
Current assignee: Hangzhou Aichi Engineering Vehicles Co Ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2020-08-18
Anticipated expiration: 2029-11-12

Abstract

The utility model relates to a sensitive proportion multiple unit valve application system of load for high altitude construction car, including a solenoid valve, non-proportional reversing valve, No. two solenoid valves and the sensitive proportion multiple unit valve of load, characteristics are: the first electromagnetic valve and the second electromagnetic valve are respectively arranged on oil inlet paths of the load sensitive proportional multi-way valve and the non-proportional reversing valve, the non-proportional reversing valve is connected with the load sensitive proportional multi-way valve in parallel, the non-proportional reversing valve is composed of a plurality of reversing valves, the load sensitive proportional multi-way valve is composed of a connecting block, a tail plate and a plurality of reversing valve units, the load sensitive proportional multi-way valve is arranged at a rotary table of the high-altitude operation vehicle, and the non-proportional reversing valve is arranged at a working bucket of the high-altitude operation vehicle. The utility model has the advantages of reasonable design, low in manufacturing cost, installation and easy maintenance, the flexible operation is high-efficient to can further improve the manned travelling comfort of work fill.

Description

Load-sensitive proportional multi-way valve application system for overhead working truck

Technical Field

The utility model belongs to the technical field of high altitude construction equipment, concretely relates to sensitive proportion multiple unit valve application system of load for high altitude construction car, mainly used high altitude construction car.

Background

The overhead working truck is a multipurpose overhead working machine, and generally comprises a rotary table arranged on a truck body, a multi-section arm support connected to the rotary table and a working hopper arranged at the tail end of the arm support, wherein the working hopper is used for carrying workers and working devices and can convey the workers and the working devices to specified heights and positions for overhead working through the movement of the rotary table and the arm support. At present, most of high-altitude operation vehicles adopt a hydraulic transmission mode to realize stepless speed regulation and random change of a movement direction, a load sensitive proportional multi-way valve is selected to further improve the transmission stability and the manned comfort of a working bucket, and different actuating mechanisms have different working speeds. Although the use of the load-sensitive proportional multi-way valve obviously improves the stability, accuracy and reliability of the high-altitude operation vehicle during operation, the problems of cost increase, poor economy, complex maintenance and the like are also brought, so that the improvement of the existing load-sensitive proportional multi-way valve control system is expected, and a novel control system with simpler structure, lower cost and convenient maintenance is designed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a structural design is reasonable, with low costs, easy maintenance, can further improve the sensitive proportional multi-way valve application system of load that is used for the high altitude construction car of work fill manned travelling comfort.

The utility model provides a technical scheme that above-mentioned problem adopted is: the load sensitive proportional multi-way valve application system for the overhead working truck comprises a first electromagnetic valve, a non-proportional reversing valve, a second electromagnetic valve and a load sensitive proportional multi-way valve, and is characterized in that: the non-proportional reversing valve and the load-sensitive proportional multi-way valve are connected on the main oil line in a parallel connection mode, the oil inlet path of the non-proportional reversing valve is provided with a second electromagnetic valve, the oil inlet path of the load-sensitive proportional multi-way valve is provided with a first electromagnetic valve, the load sensitive proportional multi-way valve comprises a connecting block, a reversing valve unit and a tail plate, a three-way pressure compensator, a safety valve and a pressure reducing valve which are connected in parallel are arranged in the connecting block, a filter is also arranged behind the pressure reducing valve, the reversing valve unit comprises a main reversing valve, a shuttle valve, a two-way pressure compensator and a secondary overflow valve, the shuttle valve is matched with a three-way pressure compensator in the connecting block to work, the two-way pressure compensator is connected with the main reversing valve in series, the load-sensitive proportional multi-way valve is connected with the first actuating element, and the non-proportional reversing valve is connected with the second actuating element. The utility model discloses utilize solenoid valve control load sensitive proportional multi-way valve's oil feed break-make and off-load, utilize solenoid valve control No. two oil feed break-make of non-proportional reversing valve, realize that an executive component and No. two executive components carry out different combination actions through the valve position of switching non-proportional reversing valve and load sensitive proportional multi-way valve, three-way pressure compensator in the connecting block of load sensitive proportional multi-way valve and the shuttle valve cooperation work in the switching-over valve unit make oil pump outlet pressure be higher than each main switching-over valve highest load pressure, make the unnecessary flow that the oil pump provided pass through three-way pressure compensator overflow in the oil return case; the two-way pressure compensator is used for ensuring that each actuating element works independently at different pressures and speeds, the control flow is not influenced by the load, each reversing valve can take oil as required, and the energy-saving effect is good; the secondary overflow valve limits the highest pressure of the load port of the reversing valve by limiting the pressure of the LS. The system is highly integrated in structure, adopts a modular design, has small installation space, and is favorable for maintenance due to the fact that the installation positions of all parts are clear.

As preferred, the utility model discloses an aerial working car includes automobile chassis, revolving stage, cantilever crane, work fill, an executive component and No. two executive components, the revolving stage is installed on automobile chassis, and the both ends of cantilever crane link to each other with revolving stage and work fill respectively, still install the revolving stage control box on the revolving stage, install the work fill control box on the work fill, an executive component links to each other with revolving stage and cantilever crane respectively, No. two executive components link to each other with cantilever crane and work fill respectively. When the overhead working truck works, a worker can respectively operate through the rotary table operation box positioned on the rotary table and the working bucket operation box positioned on the working bucket to control the first execution element and the second execution element, wherein the first execution element is used for controlling the rotary table and the arm support to execute different action instructions, and the second execution element is used for controlling the arm support and the working bucket to execute different action instructions.

Preferably, the non-proportional reversing valve of the present invention is composed of a plurality of reversing valves in parallel or in a clamping manner, and the non-proportional reversing valve is located at the turntable. Because the second actuating element sometimes needs to execute a plurality of different actions at the same time, and the actions cannot be realized only by a single reversing valve, a plurality of reversing valves are combined and used in a parallel or clamping mode.

As preferred, the utility model discloses a sensitive proportion multiple unit valve of load divide into parallel, liquid accuse formula and screens formula, the parallel comprises the switching-over valve unit that a plurality of quantity connect in parallel each other and the connecting block of connection at switching-over valve unit both ends and tailboard, and the sensitive proportion multiple unit valve of load is located work fill department. The parallel load-sensitive proportional multi-way valve is also provided with a plurality of reversing valve units because the first actuating element needs to execute a plurality of different actions.

Preferably, the safety valve of the present invention is in a normally closed state. The safety valve plays a safety protection role in the application system, when the pressure rises above a set value, the safety valve automatically opens to prevent the pressure from rising continuously, and when the pressure drops to the set value, the safety valve automatically returns to a closed state.

Preferably, the first solenoid valve of the present invention includes but is not limited to a two-position three-way solenoid valve, and the second solenoid valve includes but is not limited to a two-position four-way solenoid valve. When the first electromagnetic valve is electrified to work, the P port and the LS port are communicated, and a low-pressure oil return path in the load-sensitive proportional multi-way valve is closed, so that the system can be ensured to build pressure; when the second electromagnetic valve is electrified to work, the port P is communicated with the port B, the port T is communicated with the port A, and hydraulic oil enters the second execution element along the arm support to work.

Preferably, the utility model discloses an executive component carries out including gyration, fluctuation, underarm, flexible action at the during operation, No. two executive component carry out including going up and down, hoist, swing, instrument action at the during operation. The different actions executed by the first actuating element are respectively controlled by different reversing valve units in the load-sensitive proportional multi-way valve, and the different actions executed by the second actuating element are respectively controlled by different reversing valves in the non-proportional reversing valve.

Compared with the prior art, the utility model, have following advantage and effect: the on-off relation between the LS signal and the main oil way P, T is established through the first electromagnetic valve, and the on-off of oil inlet of the non-proportional reversing valve is controlled through the second electromagnetic valve, so that the first actuating element and the second actuating element can execute different combined actions, the composition and the structure of a control system are simplified, the manufacturing cost is reduced, the economy is improved, the system is convenient to install and maintain, the operation is flexible and efficient, and the popularization and the implementation are easy.

Drawings

In order to illustrate the embodiments of the present invention or the solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is a schematic structural view of a load-sensitive proportional multi-way valve according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of an actual structure of the embodiment of the present invention.

Fig. 4 is a schematic structural view of the aerial work platform of the embodiment of the present invention.

Description of reference numerals: 1. a first electromagnetic valve; 2. a non-proportional directional valve; 3. a second electromagnetic valve; 4. a load-sensitive proportional multi-way valve; 5. an execution element; 6. an actuator element number two; 7. connecting blocks; 8. a direction change valve unit; 9. a tail plate; 10. a three-way pressure compensator; 11. a safety valve; 12. a pressure reducing valve; 13. a filter; 14. a main directional control valve; 15. a shuttle valve; 16. a two-way pressure compensator; 17. a secondary overflow valve; 18. an automotive chassis; 19. a turntable; 20. a boom; 21. a work bench.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

Examples are given.

Referring to fig. 1 to 4, the aerial working truck of this embodiment includes an automobile chassis 18, a turntable 19, an arm support 20, a working bucket 21, a first actuator 5 and a second actuator 6, wherein the turntable 19 is mounted on the automobile chassis 18, a turntable operation box is mounted on the turntable 19, two ends of the arm support 20 are respectively connected with the turntable 19 and the working bucket 21, the arm support 20 is composed of a large arm, a second arm and a small arm, a hook is mounted at the front end of the large arm, the large arm and the second arm are connected with each other through a balancing device and an oil cylinder at the front end, the working bucket 21 is mounted at the tail end of the small arm, the working bucket 21 is square, the working bucket operation box is mounted on the working bucket 21, the first actuator is located at a connection position of the turntable 19 and the arm support 20, and the second actuator 6 is located at a connection position of the arm support. When the overhead working truck works, a worker can respectively operate through the rotary table operation box positioned on the rotary table 19 and the working bucket operation box positioned on the working bucket 21 to control the first execution element 5 and the second execution element 6, wherein the first execution element is used for controlling the rotary table 19 and the arm support 20 to execute a plurality of actions such as rotation, fluctuation, underarm, stretching and the like, and the second execution element is used for controlling the arm support and the working bucket to execute a plurality of actions such as lifting, hoisting, swinging, tools and the like.

The load-sensitive proportional multi-way valve application system comprises a first electromagnetic valve 1, a non-proportional reversing valve 2, a second electromagnetic valve 3 and a load-sensitive proportional multi-way valve 4. The non-proportional reversing valve 2 and the load-sensitive proportional multi-way valve 4 are connected to a main oil path in a parallel connection mode, a second electromagnetic valve 3 is arranged on an oil inlet path of the non-proportional reversing valve 2 and used for controlling the on-off of oil inlet of the non-proportional reversing valve 2, the second electromagnetic valve 3 is a two-position four-way electromagnetic valve, when the two-position four-way electromagnetic valve is electrified and works, a port P is communicated with a port B, a port T is communicated with a port A, and hydraulic oil enters the non-proportional reversing valve 2 along the oil path; the first electromagnetic valve 1 is arranged on an oil inlet path of the load sensitive proportional multi-way valve 4 and used for controlling the on-off and the off-load of oil inlet of the load sensitive proportional multi-way valve 4, the first electromagnetic valve 1 is a two-position three-way electromagnetic valve, when the first electromagnetic valve is electrified to work, a P port and an LS port are communicated, a low-pressure oil return path in the load sensitive proportional multi-way valve 4 is closed, and the pressure can be built in a system.

The load-sensitive proportional multi-way valve 4 of the embodiment comprises a connecting block 7, a reversing valve unit 8 and a tail plate 9, wherein a three-way pressure compensator 10, a safety valve 11 and a pressure reducing valve 12 which are connected in parallel are arranged in the connecting block 7, and a filter 13 is arranged behind the pressure reducing valve 12. The safety valve 11 plays a safety protection role in the application system, and is normally in a closed state, when the pressure rises above a set value, the safety valve 11 can be automatically opened to prevent the pressure from rising continuously, and when the pressure drops to the set value, the safety valve can automatically return to the closed state. The reversing valve unit 8 comprises a main reversing valve 14, a shuttle valve 15, a two-way pressure compensator 16 and a secondary overflow valve 17, wherein the shuttle valve 15 and the three-way pressure compensator 10 work cooperatively to enable the pressure at the outlet of the oil pump to be higher than the highest load pressure of each main reversing valve 14, so that redundant flow provided by the oil pump can overflow to the oil return tank through the three-way pressure compensator 10, the two-way pressure compensator 16 is used for ensuring that each executing element works independently at different pressure and speed, controlling the flow without being influenced by load, enabling each reversing valve to take oil as required and having better energy-saving effect; the secondary relief valve 17 limits the highest pressure of the load port of the main directional control valve 14 by limiting the pressure of LS. The reversing valve units 8 are connected with a plurality of numbers in the load-sensitive proportional multi-way valve 4 in a parallel connection mode, and each reversing valve unit 8 is connected with the first actuating element 5 through the main reversing valve 14 to control the first actuating element 5 to execute different actions. The load-sensitive proportional multi-way valve 4 is integrally arranged inside the rotary table 19, and the modular design is adopted, so that the installation space is small, the installation positions of all parts are clear, and the maintenance work is facilitated.

The non-proportional reversing valve 2 of the embodiment is arranged at the working bucket 21 and is composed of a plurality of reversing valves in parallel, the non-proportional reversing valve 2 is connected with the second actuating element 6, and the second actuating element 6 can execute different actions by utilizing the plurality of parallel reversing valves.

In the embodiment, when the load sensitive proportional multi-way valve 4 is operated by the turntable operation box or the working bucket operation box, the first electromagnetic valve 1 and the second electromagnetic valve 3 are in a power-off state, and the load sensitive proportional multi-way valve 4 distributes flow to the first execution element 5 to work as required; when the reversing valve 2 is operated, the first electromagnetic valve 1 is electrified to work, a medium-low pressure oil return path of the load sensitive proportional multi-way valve 4 is closed, the system can be ensured to build pressure, the second electromagnetic valve 3 is electrified to work, a port P and a port B of the second electromagnetic valve 3 are communicated, and the non-proportional reversing valve 2 controls the second execution element 6 to work; when the non-proportional reversing valve 2 and the load-sensitive proportional multi-way valve 4 are operated simultaneously, the flow is distributed to the first actuator 5 and the second actuator 6 to work simultaneously.

In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a sensitive proportional multi-way valve application system of load for high altitude construction car, includes solenoid valve (1), non-proportional reversing valve (2), No. two solenoid valves (3) and the sensitive proportional multi-way valve of load (4), its characterized in that: the non-proportional reversing valve (2) and the load-sensitive proportional multi-way valve (4) are connected to a main oil path in a parallel connection mode, an oil inlet path of the non-proportional reversing valve (2) is provided with a second electromagnetic valve (3), an oil inlet path of the load-sensitive proportional multi-way valve (4) is provided with a first electromagnetic valve (1), the load-sensitive proportional multi-way valve (4) comprises a connecting block (7), a reversing valve unit (8) and a tail plate (9), a three-way pressure compensator (10), a safety valve (11) and a pressure reducing valve (12) which are connected in parallel are arranged in the connecting block (7), a filter (13) is further arranged behind the pressure reducing valve (12), the reversing valve unit (8) comprises a main reversing valve (14), a shuttle valve (15), a two-way pressure compensator (16) and a secondary overflow valve (17), and the shuttle valve (15) and the three-way pressure compensator (10) in the connecting block (7, the two-way pressure compensator (16) is connected with a main reversing valve (14) in series, the load sensitive proportional multi-way valve (4) is connected with the first actuating element (5), and the non-proportional reversing valve (2) is connected with the second actuating element (6).

2. The load sensitive proportional multi-way valve application system for aerial lift trucks of claim 1, wherein: the high-altitude operation car comprises an automobile chassis (18), a rotary table (19), an arm support (20), a working bucket (21), a first execution element (5) and a second execution element (6), wherein the rotary table (19) is installed on the automobile chassis (18), two ends of the arm support (20) are respectively connected with the rotary table (19) and the working bucket (21), a rotary table operation box is further installed on the rotary table (19), the working bucket operation box is installed on the working bucket (21), the first execution element (5) is respectively connected with the rotary table (19) and the arm support (20), and the second execution element (6) is respectively connected with the arm support (20) and the working bucket (21).

3. The load sensitive proportional multi-way valve application system for aerial lift trucks of claim 1, wherein: the non-proportional reversing valve (2) is composed of a plurality of reversing valves in parallel or in a clamping mode, and the non-proportional reversing valve (2) is located at the rotary table (19).

4. The load sensitive proportional multi-way valve application system for aerial lift trucks of claim 1, wherein: the load-sensitive proportional multi-way valve (4) is divided into a parallel type, a hydraulic control type and a clamping type, the parallel type is composed of a plurality of reversing valve units (8) which are mutually connected in parallel, and connecting blocks (7) and tail plates (9) which are connected to two ends of the reversing valve units (8), and the load-sensitive proportional multi-way valve (4) is located at a working bucket (21).

5. The load sensitive proportional multi-way valve application system for aerial lift trucks of claim 1, wherein: the safety valve (11) is in a normally closed state.

6. The load sensitive proportional multi-way valve application system for aerial lift trucks of claim 1, wherein: the first solenoid valve (1) comprises but is not limited to a two-position three-way solenoid valve, and the second solenoid valve (3) comprises but is not limited to a two-position four-way solenoid valve.

7. The load sensitive proportional multi-way valve application system for aerial lift trucks of claim 1, wherein: the first actuating element (5) performs actions including rotation, fluctuation, lower arm and expansion and contraction during working, and the second actuating element (6) performs actions including lifting, winding, swinging and tool actions during working.