CN215214157U

CN215214157U - Hydraulic system of overhead working truck

Info

Publication number: CN215214157U
Application number: CN202120977428.7U
Authority: CN
Inventors: 侯敏; 刘正雷; 彭彪
Original assignee: Hunan Chutian Huaxing Intelligent Equipment Co ltd
Current assignee: Hunan Chutian Huaxing Intelligent Equipment Co ltd
Priority date: 2021-05-08
Filing date: 2021-05-08
Publication date: 2021-12-17
Anticipated expiration: 2031-05-08

Abstract

The utility model discloses an aerial working car hydraulic system, include oil tank, oil pump, flow distribution valve, turn to oil circuit and walking oil circuit, the oil-out of oil pump with the oil inlet of flow distribution valve links to each other, an oil-out of flow distribution valve with the oil inlet that turns to the oil circuit links to each other, another oil-out of flow distribution valve with the oil inlet of walking oil circuit links to each other, turn to the oil return opening of oil circuit with be equipped with the series-parallel solenoid valve between the oil inlet of walking oil circuit, the oil return opening of series-parallel solenoid valve with the oil tank links to each other, works as when series-parallel solenoid valve is in series connection position, turn to the oil return opening of oil circuit with the oil inlet intercommunication of walking oil circuit, work as when series-parallel solenoid valve is in parallel connection position, turn to the oil return opening of oil circuit with the oil tank intercommunication. The utility model has the advantages of simple structure is favorable to avoiding walking and the pause in when turning to the compound action to be frustrated and turn to hypodynamia's phenomenon under the heavy load operating mode.

Description

Hydraulic system of overhead working truck

Technical Field

The utility model relates to a high altitude construction equipment especially relates to a high altitude construction car hydraulic system.

Background

The scissor-fork type overhead working truck is used for replacing a scaffold and is widely used for overhead working, such as indoor and outdoor overhead decoration work and the like. The scissor type overhead working truck comprises three actions of lifting, walking and steering, wherein the walking and the steering have single action and composite action, and the walking smoothness and the composite action are the core of the control performance of the whole machine. At present, the following two main technical schemes are adopted for walking and steering:

one is as follows: the single pump supplies oil, the flow is divided into two parts through the flow dividing valve, one part is used for steering (steering is preferred, the flow value is a fixed value and accounts for about 15 percent of the total flow of the system), the other part is used for walking, the steering return oil directly returns to the oil tank, and the walking and steering parallel mode belongs to. When the height of the scissor-type overhead working truck is lower than a set value (for example, about 2.5 m), the scissor-type overhead working truck is in a full-flow walking mode, if steering action is added in the walking process, the walking speed can be reduced by about 15%, and at the moment, the scissor-type overhead working truck has slight pause and frustration; when the scissor-type aerial work vehicle is higher than a set value, in order to ensure driving safety, the walking speed of the work vehicle can be limited by adjusting the output flow of the pump, the flow divided by steering is a fixed value, so the walking speed can be greatly reduced (about 30 percent or even larger), steering action is added in the walking process of the scissor-type aerial work vehicle at the moment, the scissor-type aerial work vehicle has serious pause and frustration, some manufacturers can adjust the walking speed to be very low in order to pursue more stable aerial running, steering is added at the moment, and the walking even can be stopped.

The second step is as follows: the single pump supplies oil, the flow distribution is the same as the scheme, but the return oil of the steering action is directly connected with the walking oil inlet, and the walking and steering series mode belongs to. At the moment, the steering action is added in the walking process, the walking speed is not influenced, and therefore the vehicle does not have pause and frustration. However, this solution has the following disadvantages: because the steering oil circuit and the walking oil circuit are connected in series, the system pressure is equal to the sum of the walking pressure and the steering pressure during compound action, and therefore, when the walking load is large (such as climbing working conditions), the phenomenon of steering weakness can occur.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome prior art not enough, provide a simple structure, be favorable to avoiding the walking and turn to the compound action when the pause and pause in the time of feeling and the heavy load operating mode under the compound action turn to the high altitude construction car hydraulic system of the phenomenon hypodynamia.

In order to solve the technical problem, the utility model discloses a following technical scheme:

the hydraulic system of the overhead working truck comprises an oil tank, an oil pump, a flow distribution valve, a steering oil way and a walking oil way, wherein an oil outlet of the oil pump is connected with an oil inlet of the flow distribution valve, an oil outlet of the flow distribution valve is connected with an oil inlet of the steering oil way, another oil outlet of the flow distribution valve is connected with an oil inlet of the walking oil way, a series-parallel electromagnetic valve is arranged between an oil return port of the steering oil way and the oil inlet of the walking oil way, an oil return port of the series-parallel electromagnetic valve is connected with the oil tank, when the series-parallel electromagnetic valve is in a series position, the oil return port of the steering oil way is communicated with the oil inlet of the walking oil way, and when the series-parallel electromagnetic valve is in a parallel position, the oil return port of the steering oil way is communicated with the oil tank.

As a further improvement of the above technical solution: and a one-way valve is arranged between the steering oil way and the series-parallel connection electromagnetic valve.

As a further improvement of the above technical solution: the electromagnetic valve also comprises an inclination angle sensor which is in signal connection with the series-parallel connection electromagnetic valves.

As a further improvement of the above technical solution: the steering oil path comprises a steering electromagnetic valve connected with the flow distribution valve and a steering execution component connected with the steering electromagnetic valve.

As a further improvement of the above technical solution: the steering executing component is a double-rod hydraulic cylinder.

As a further improvement of the above technical solution: the walking oil path comprises a walking electromagnetic valve connected with the flow distribution valve and a walking execution component connected with the walking electromagnetic valve.

As a further improvement of the above technical solution: the walking executing component comprises more than two hydraulic motors.

As a further improvement of the above technical solution: and a lifting electromagnetic valve is also arranged between the oil pump and the flow distribution valve.

Compared with the prior art, the utility model has the advantages of: the utility model discloses an aerial working car hydraulic system is equipped with the series-parallel solenoid valve between the oil return opening of turning to the oil circuit and the oil inlet of walking oil circuit, realizes turning to the oil circuit and walking oil circuit switching of series-parallel through the series-parallel solenoid valve, when the series-parallel solenoid valve is in series connection position, turns to the oil return opening of oil circuit and communicates with the oil inlet of walking oil circuit, turns to the oil circuit and walks the oil circuit and establishes ties this moment, when walking and turning to the compound action, the walking is not slowed down, the vehicle does not have and is frustrated and feels; when the series-parallel connection electromagnetic valves are in parallel connection, the oil return port of the steering oil way is communicated with the oil tank, the steering oil way is connected with the walking oil way in parallel, the steering action is not influenced by walking load, and the steering oil way is suitable for heavy-load working conditions such as climbing.

Drawings

Fig. 1 is a schematic structural diagram of the hydraulic system of the overhead working truck of the utility model.

The reference numerals in the figures denote: 1. an oil tank; 2. an oil pump; 3. a flow distribution valve; 4. a steering oil path; 41. a steering solenoid valve; 42. a steering executing component; 5. a traveling oil path; 51. a traveling electromagnetic valve; 52. a walking executing component; 6. series-parallel connection electromagnetic valves; 61. a one-way valve; 7. lifting solenoid valve.

Detailed Description

The invention is described in further detail below with reference to the drawings and specific examples.

Fig. 1 shows an embodiment of the hydraulic system of the aerial work platform of the present invention, the hydraulic system of the aerial work platform of this embodiment comprises an oil tank 1, an oil pump 2, a flow distribution valve 3, a steering oil path 4 and a walking oil path 5, an oil outlet of the oil pump 2 is connected with an oil inlet of the flow distribution valve 3, an oil outlet of the flow distribution valve 3 is connected with an oil inlet of the steering oil path 4, another oil outlet of the flow distribution valve 3 is connected with an oil inlet of the walking oil path 5, a series-parallel connection solenoid valve 6 is arranged between an oil return port of the steering oil path 4 and the oil inlet of the walking oil path 5, an oil return port of the series-parallel connection solenoid valve 6 is connected with the oil tank 1, when the series-parallel electromagnetic valves 6 are in the series position, the oil return port of the steering oil path 4 is communicated with the oil inlet of the walking oil path 5, when the series-parallel connection electromagnetic valves 6 are in parallel connection, the oil return port of the steering oil path 4 is communicated with the oil tank 1.

According to the hydraulic system of the overhead working truck, the series-parallel connection electromagnetic valve 6 is arranged between an oil return port of the steering oil circuit 4 and an oil inlet of the walking oil circuit 5, series-parallel connection switching of the steering oil circuit 4 and the walking oil circuit 5 is realized through the series-parallel connection electromagnetic valve 6, when the series-parallel connection electromagnetic valve 6 is in a series position, the oil return port of the steering oil circuit 4 is communicated with the oil inlet of the walking oil circuit 5, the steering oil circuit 4 and the walking oil circuit 5 are connected in series at the moment, walking is not decelerated during walking and steering composite actions, and vehicles are not subjected to pause feeling; when the series-parallel connection electromagnetic valve 6 is in a parallel position, an oil return port of the steering oil path 4 is communicated with the oil tank 1, the steering oil path 4 is connected with the walking oil path 5 in parallel, the steering action is not influenced by the walking load, and the steering oil path is suitable for large-load working conditions such as climbing.

Further, in the present embodiment, a check valve 61 is provided between the steering oil passage 4 and the series-parallel solenoid valves 6. The one-way valve 61 is arranged to prevent hydraulic oil from reversely entering the steering oil way 4, and normal operation of the system is guaranteed.

Further, in the present embodiment, the hydraulic system of the aerial lift truck further includes an inclination sensor (not shown in the figure), and the inclination sensor is in signal connection with the series-parallel connection solenoid valve 6. When the inclination angle sensor identifies the climbing working condition, the series-parallel connection electromagnetic valve 6 is switched to the parallel connection position in time, the steering oil path 4 is connected with the walking oil path 5 in parallel, and the steering action is not influenced by the walking load.

As a preferred embodiment, the steering oil passage 4 includes a steering solenoid valve 41 connected to the flow distribution valve 3, and a steering actuator 42 connected to the steering solenoid valve 41.

In a preferred embodiment, the steering actuator 42 is a double-rod hydraulic cylinder, which is simple and reliable. In other embodiments, the steering oil passage 4 may have other structures, and the steering operation of the aerial work platform may be achieved, and the steering actuator 42 may be two single-rod hydraulic cylinders in opposite directions.

In a preferred embodiment, the travel oil path 5 includes a travel solenoid valve 51 connected to the flow rate distribution valve 3, and a travel actuator 52 connected to the travel solenoid valve 51.

As a preferred embodiment, the walking executing component 52 comprises more than two hydraulic motors, and the structure is simple and reliable. Of course, in other embodiments, the traveling oil path 5 may have other configurations, and the steering operation of the aerial work vehicle may be performed, and the number of the traveling actuators 52 may be appropriately adjusted.

In the preferred embodiment, a lifting solenoid valve 7 is further disposed between the oil pump 2 and the flow distributing valve 3. The lifting electromagnetic valve 7 controls a lifting execution component (not shown in the figure, such as a hydraulic cylinder and the like) to realize the lifting action of the high-altitude operation vehicle, and the structure is simple and reliable.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the technical solution of the present invention, using the technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides an aerial working car hydraulic system, includes oil tank (1), oil pump (2), flow distribution valve (3), turns to oil circuit (4) and walking oil circuit (5), the oil-out of oil pump (2) with the oil inlet of flow distribution valve (3) links to each other, an oil-out of flow distribution valve (3) with turn to the oil inlet of oil circuit (4) and link to each other, another oil-out of flow distribution valve (3) with the oil inlet of walking oil circuit (5) links to each other its characterized in that: turn to the oil return opening of oil circuit (4) with be equipped with between the oil inlet of walking oil circuit (5) connection in series solenoid valve (6), the oil return opening of connection in series solenoid valve (6) with oil tank (1) links to each other, works as when connection in series solenoid valve (6) is in the position of establishing ties, turn to the oil return opening of oil circuit (4) with the oil inlet intercommunication of walking oil circuit (5), works as when connection in series solenoid valve (6) is in the position of establishing ties, turn to the oil return opening of oil circuit (4) with oil tank (1) intercommunication.

2. The aerial lift truck hydraulic system of claim 1, wherein: a one-way valve (61) is arranged between the steering oil way (4) and the series-parallel electromagnetic valve (6).

3. The aerial lift truck hydraulic system of claim 1, wherein: the electromagnetic valve also comprises an inclination angle sensor which is in signal connection with the series-parallel connection electromagnetic valves (6).

4. The aerial lift truck hydraulic system of any one of claims 1 to 3, wherein: the steering oil path (4) comprises a steering electromagnetic valve (41) connected with the flow distribution valve (3) and a steering execution component (42) connected with the steering electromagnetic valve (41).

5. The aerial lift truck hydraulic system of claim 4, wherein: the steering executing component (42) is a double-rod hydraulic cylinder.

6. The aerial lift truck hydraulic system of any one of claims 1 to 3, wherein: the walking oil path (5) comprises a walking electromagnetic valve (51) connected with the flow distribution valve (3) and a walking execution component (52) connected with the walking electromagnetic valve (51).

7. The aerial lift truck hydraulic system of claim 6, wherein: the walking execution component (52) comprises more than two hydraulic motors.

8. The aerial lift truck hydraulic system of any one of claims 1 to 3, wherein: and a lifting electromagnetic valve (7) is also arranged between the oil pump (2) and the flow distribution valve (3).