CN117756035A - Aerial working platform and hydraulic control system thereof - Google Patents

Abstract

The application discloses an aerial working platform and a hydraulic control system thereof, wherein the system comprises a telescopic oil cylinder and a main reversing valve; the one-way balance valve is arranged in the working oil way with the rod cavity, and a balance valve pilot oil way of the one-way balance valve is connected with the working oil way without the rod cavity; the hydraulic control one-way valve is arranged in the working oil path of the rodless cavity and enables hydraulic oil to flow to the rodless cavity through the hydraulic control one-way valve and to be blocked reversely, the hydraulic control one-way valve comprises a one-way valve pilot oil path for reversely opening the one-way valve, and the one-way valve pilot oil path is connected to the working oil path of the rod cavity between the one-way balance valve and the main reversing valve; the oil cylinder is communicated with the oil way, the rodless cavity and the rod cavity are communicated, and a communication control valve for controlling the on-off of the oil way is arranged in the communication oil way. According to the hydraulic balance valve, the novel hydraulic balance valve is used, the pressure is detected through the pilot oil way in the balance valve, the automatic flow adjustment is completed, and the running speed of the hydraulic oil cylinder can be automatically controlled.

Description

Aerial working platform and hydraulic control system thereof

Technical Field

The application belongs to the technical field of aerial work, and particularly relates to an aerial work platform and a hydraulic control system thereof.

Background

In the use process of the high-altitude operation machine, various arm supports are often required to be frequently operated, and the hydraulic oil cylinders drive the various arm supports to move. The speed of the cylinder operation is generally controlled by electric or manual operation, and the speed is often fixed and cannot be changed according to the load of the cylinder.

In the hydraulic system of the oil cylinder, the hydraulic oil cylinder is provided with hydraulic oil by a pump, and the proportional reversing valve provides proper flow for the oil cylinder by controlling the magnitude of current, so that the movement speed of the hydraulic oil cylinder is controlled, which is a conventional control principle of the speed of the oil cylinder. In the process, a sensor and the like can be added to detect the pressure of the cavity of the oil cylinder and the position of the piston, and then the movement speed of the hydraulic oil cylinder can be timely adjusted by changing the current of the proportional reversing valve. However, the pressure sensor, the stroke sensor and other detection components are inevitably required to be additionally introduced, so that the cost is high, the reliability is poor, the failure rate is high, the materials are more, and the standardization is not facilitated.

Disclosure of Invention

The purpose of the application is to provide an aerial working platform and a hydraulic control system thereof, so as to simplify the system and control the action speed of a hydraulic cylinder more automatically.

According to one aspect of the present application, there is provided a hydraulic control system for an aerial work platform, comprising:

the telescopic oil cylinder comprises a telescopic oil cylinder and a main reversing valve, wherein a rod cavity working oil way is connected between a working oil port of the main reversing valve and a rod cavity of the telescopic oil cylinder, and a rod cavity working oil way is connected between the working oil port of the main reversing valve and a rod cavity-free working oil way;

the one-way balance valve is arranged in the working oil way with the rod cavity, and a balance valve pilot oil way of the one-way balance valve is connected with the working oil way without the rod cavity;

the hydraulic control one-way valve is arranged in the rodless cavity working oil way and enables hydraulic oil to flow to the rodless cavity through the hydraulic control one-way valve and to be blocked reversely, the hydraulic control one-way valve comprises a one-way valve pilot oil way for opening the one-way valve reversely, and the one-way valve pilot oil way is connected to the rod cavity working oil way between the one-way balance valve and the main reversing valve;

the oil cylinder is communicated with the oil way, the rodless cavity and the rod cavity are communicated, and a communication control valve for controlling the on-off of the oil way is arranged in the communication oil way.

In some embodiments, the hydraulic control system includes:

and the overflow valve is connected with the hydraulic control one-way valve in parallel and is arranged in the working oil way of the rodless cavity.

In some embodiments, the communication control valve is also a pilot-controlled check valve and is configured to only allow hydraulic oil to flow from the rod-shaped cavity to the rodless cavity and to be blocked reversely, the communication control valve includes a communication valve pilot oil path for controlling a check valve opening pressure, and the pilot oil of the communication valve pilot oil path is derived from the rod-shaped cavity working oil path between the check balance valve and the main directional valve and is used for driving a valve port lock of the communication control valve.

In some embodiments, the communication control valve is a normally closed valve, and the one-way valve opening pressure of the communication control valve is greater than the one-way valve opening pressure of the pilot operated one-way valve.

In some embodiments, an electromagnetic switch valve connected in series with the communication control valve is further provided in the cylinder communication oil path.

In some embodiments, the electromagnetic switch valve is a normally closed electromagnetic valve which normally breaks an oil path.

In some embodiments, the hydraulic control system includes:

the pressure sensor is used for detecting the oil pressure of one end of the rodless cavity working oil way, which is close to the main reversing valve; and

and the controller is used for controlling the on-off of the electromagnetic switch valve.

In some embodiments, the controller is configured to:

acquiring an oil pressure detection value of the pressure sensor;

determining that the oil pressure detection value is smaller than a set pressure value;

controlling the electromagnetic switch valve to conduct the oil cylinder communication oil way;

determining that the oil pressure detection value is not less than the set pressure value;

and controlling the electromagnetic switch valve to disconnect the oil cylinder from the oil way.

In some embodiments, the balance valve set pressure of the one-way balance valve is adjustable and set to be greater than 1.3 times the load pressure.

According to another aspect of the application, there is also provided an aerial work platform comprising a hydraulic control system according to the aerial work platform described above.

In the hydraulic control system of the aerial working platform, the hydraulic control one-way valve is adopted to replace the existing one-way balance valve on the working oil way without the rod cavity, and the oil cylinder communication oil way with the communication control valve is additionally arranged. The arrangement is that when the piston rod is pushed out, the oil pressure of the working oil way of the rodless cavity is small and is insufficient to open the one-way balance valve when the load pressure is small, so that the oil return of the rod cavity can open the communication control valve, and the oil return is carried out to the rodless cavity through the oil cylinder connecting oil way, the differential function is realized, and the extending speed of the piston is high under the working condition of small load; when the load pressure is high, the oil pressure of the working oil way of the rodless cavity is high, and the one-way balance valve can be opened, so that the oil can be normally returned through the one-way balance valve, and the extending speed of the piston is low; therefore, the hydraulic system can automatically adjust the speed of the oil cylinder.

Additional features and advantages of embodiments of the present application will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of embodiments of the present application and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and together with the description serve to explain, without limitation, the embodiments of the present application. Other figures may be made from the structures shown in these figures without inventive effort for a person of ordinary skill in the art. In the drawings:

FIG. 1 is a hydraulic schematic diagram of a hydraulic control system of a prior art aerial work platform;

FIG. 2 is a hydraulic schematic diagram of a hydraulic control system of an aerial work platform in accordance with one embodiment of the present application; and

fig. 3 is a hydraulic schematic diagram of a hydraulic control system of an aerial work platform in accordance with another embodiment of the present application.

Description of the reference numerals

1. Filter for hydraulic oil tank 2

3. Gear pump 4 pump mouth check valve

5. One-way balance valve of main reversing valve 6

7. Hydraulic control one-way valve 8 overflow valve

9. Telescopic cylinder of communication control valve 10

11. Electromagnetic switch valve L0 oil cylinder communication oil way

L1 working oil circuit with rod cavity L2 working oil circuit without rod cavity

X0 one-way valve pilot oil path X1 communication valve pilot oil path

Y01-Y03 electromagnet

Detailed Description

The following detailed description of specific embodiments of the present application refers to the accompanying drawings. It should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application.

An aerial work platform according to the present application and a hydraulic control system thereof are described below with reference to the accompanying drawings.

As shown in fig. 1, in the hydraulic control system of the existing aerial working platform, hydraulic oil reaches a gear pump through a filter, the gear pump conveys the hydraulic oil to a proportional reversing valve, and when the illustrated electromagnet Y01 is powered on, the running speed of a hydraulic oil cylinder is controlled by controlling the current of the proportional electromagnet and adjusting the flow. Further, a pressure sensor and a stroke sensor can be added in the hydraulic system, and the running speed of the oil cylinder can be controlled by judging the pressure and the stroke of the piston and adjusting the magnitude of current. Obviously, the speed of the oil cylinder is difficult to be regulated by a simple hydraulic system, detection components such as a pressure sensor, a stroke sensor and the like are additionally added to be finished, the cost is high, the reliability is poor, and the standardization is not facilitated.

In view of this, the application discloses a novel hydraulic control system of aerial work platform. As shown in fig. 2, in one embodiment, the hydraulic control system includes:

the telescopic oil cylinder 10 and the main reversing valve 5, wherein a rod cavity working oil way L1 is connected between a working oil port of the main reversing valve 5 and a rod cavity of the telescopic oil cylinder 10, and a rod cavity working oil way L2 is connected between the working oil port and a rod cavity;

the one-way balance valve 6 is arranged in the working oil path L1 with the rod cavity, and a balance valve pilot oil path of the one-way balance valve 6 is connected with the working oil path L2 without the rod cavity;

the hydraulic control one-way valve 7 is arranged in the rodless cavity working oil path L2 and enables hydraulic oil to flow to the rodless cavity through the hydraulic control one-way valve 7 and to be blocked reversely, the hydraulic control one-way valve 7 comprises a one-way valve pilot oil path X0 for reversely opening the one-way valve, and the one-way valve pilot oil path X0 is connected to the rod cavity working oil path L1 between the one-way balance valve 6 and the main reversing valve 5;

the oil cylinder is communicated with an oil way L0, a rodless cavity and a rod cavity are communicated, and a communication control valve 9 for controlling the on-off of the oil way is arranged in the communication oil way.

It can be seen that, in the hydraulic system of the present application, the hydraulic control check valve 7 is adopted to replace the existing check balance valve in the rodless cavity working oil path L2, and the cylinder communication oil path L0 with the communication control valve 9 is additionally provided. Compared with the larger opening pressure of the one-way balance valve in the existing hydraulic system of fig. 1, the opening pressure of the hydraulic control one-way valve 7 of fig. 2 is small, and the energy-saving effect is better; in other words, the pilot operated check valve 7 replaces the existing one-way balancing valve, and the opening pressure is smaller when the piston rod is retracted. Particularly, when the piston rod of the telescopic oil cylinder 10 is pushed out, oil return of the rod cavity can be carried out to the rodless cavity through the oil cylinder connecting oil way L0 when the load pressure is small, and oil return is not needed through the main reversing valve 5, so that a differential function can be realized, and the extending speed of the piston is high; when the load pressure is high, the oil can be normally returned through the one-way balance valve 6, and the extending speed of the piston is low, so that the speed of the oil cylinder can be automatically adjusted, and the oil cylinder is further specifically described below.

In addition, in the application, the hydraulic control one-way valve is utilized to replace the one-way balance valve, and in the piston rod retraction stroke, the reverse opening pressure of the hydraulic control one-way valve in the working oil way of the rodless cavity is smaller than the opening pressure of the one-way balance valve, so that the oil return during piston retraction is facilitated.

In the present embodiment, the hydraulic control system further includes a relief valve 8, and the relief valve 8 is disposed in the rod-less chamber working oil passage L2 in parallel with the pilot operated check valve 7. The overflow valve 8 can limit the maximum pressure of the rodless cavity in a locking state, and plays a role in protecting the oil cylinder; compared with a one-way balance valve, the combination of the overflow valve and the hydraulic control one-way valve which are used as the replacement has lower price and cost, smaller opening pressure and more energy-saving hydraulic system.

In the embodiment of fig. 2, the communication control valve 9 also employs a pilot operated check valve to achieve more reliable automated hydraulic control without the need for additional introduction of an electrically controlled valve element. As shown in fig. 2, the communication control valve 9 therein is provided to allow only hydraulic oil to flow from the rod-shaped chamber to the rodless chamber and to be blocked reversely; the communication control valve 9 includes a communication valve pilot oil passage X1 for controlling the opening pressure of the check valve, and the pilot oil of the communication valve pilot oil passage X1 is derived from a rod chamber working oil passage L1 between the check balance valve 6 and the main directional valve 5 and is used for driving the valve port lock of the communication control valve 9. Wherein, the pilot oil passage X0 of the check valve is used for reversely opening the hydraulic control check valve 7, and the pilot oil passage X1 of the communication valve is used for driving the valve port of the communication control valve 9 to lock, so that the pilot pressure oil is guided to the opposite hydraulic control end of the check valve.

In the present embodiment, the valve element of the communication control valve 9 is pushed to the closed valve port by the compression spring, that is, the communication control valve 9 is a normally closed valve, that is, when the oil pressure of the hydraulic oil in the forward direction (that is, the oil with the rod cavity) does not reach the set value, the valve port of the communication control valve 9 is difficult to open, and the oil cylinder connecting oil path L0 is blocked. In comparison, the pilot operated check valve 7 does not have a compression spring pushing the valve core to lock the valve port, so the check valve opening pressure of the communication control valve 9 is obviously larger than that of the pilot operated check valve 7. Further, it is obvious that the opening pressure of the one-way valve of the communication control valve 9 is also smaller than the opening pressure of the one-way balance valve 6, so when the load of the oil cylinder is increased, the load pressure will firstly open the communication control valve 9, so that the communication between the rod cavity and the rodless cavity is realized, the piston is pushed out faster, when the load of the oil cylinder is larger, the oil inlet pressure of the working oil circuit L2 of the rodless cavity is larger, the one-way balance valve 6 will be opened, the oil in the rodless cavity returns through the one-way balance valve 6, and at the moment, the movement of the piston of the oil cylinder will be slowed down, and the piston is more suitable for controlling the stroke of the oil cylinder when the load is pushed out. Compared with the conventional load jacking oil return mode of the one-way balance valve 6 with the rod cavity working oil path L1 and the main reversing valve 5 all the time, after the oil cylinder communication oil path L0 and the communication control valve 9 thereof are introduced, the differential mode of the rod cavity and the rodless cavity communication can be directly realized when the small load is pushed out, so that the piston rod is pushed out faster, the response is faster, the system response is more sensitive, and the energy is also saved.

It can be understood by those skilled in the art that the communication control valve 9 is not limited to a hydraulic control check valve, and may be a hydraulic control slide valve with other possible structures, and may also be replaced by an electric control switch valve, so as to perform corresponding control according to working conditions to timely switch on or switch off the oil cylinder connecting oil path L0.

Referring to fig. 3, in another embodiment, not only the communication control valve 9 but also an electromagnetic switch valve 11 connected in series with the communication control valve 9 is provided in the cylinder communication oil passage L0. The series combination mode of the communication control valve 9 and the electromagnetic switch valve 11 can play a double safety role, and can timely switch the control oil way to select whether the differential function is realized.

Alternatively, the electromagnetic switch valve 11 in fig. 3 may be designed as a normally closed electromagnetic valve that normally shuts off the oil passage (i.e., the cylinder communication oil passage L0). When the electromagnetic switch valve 11 is powered on, similar to the embodiment of fig. 2, the oil cylinder communication oil path L0 is controlled only by the communication control valve 9, so that the oil cylinder speed is automatically adjusted. However, the electromagnetic switch valve 11 can be controlled not to be electrified under the condition of need, so that the intervention is manually controlled, and the automatic regulation mode of the oil cylinder speed is interrupted.

Specifically, in the embodiment shown in fig. 3, the electromagnetic switch valve 11 is designed as a normally closed electromagnetic valve that normally shuts off the oil passage (i.e., the cylinder communication oil passage L0). In this case, the on-off of the oil cylinder communication oil path L0 can be controlled as needed, so as to realize the switching of the automatic adjustment mode or other control modes of the oil cylinder speed.

For example, in some embodiments, a hydraulic control system may include:

the pressure sensor is used for detecting the oil pressure of one end of the working oil path L2 of the rodless cavity, which is close to the main reversing valve 5; and

and a controller for controlling the on-off of the electromagnetic switch valve 11.

In this way, the load is determined by combining the oil pressure detection of the rodless cavity of the oil cylinder with the pressure sensor, so as to judge whether to select the differential mode or the conventional oil return mode, and then the electromagnetic switch valve 11 is correspondingly controlled.

In other words, the controller may control the switching of the solenoid valve 11, i.e., control the on-off of the cylinder communication oil passage L0, but the hydraulic system may automatically realize the differential by the detection of the pressure. The electromagnetic switch valve 11 is normally closed by default, and cannot realize the differential function, and in the power-on state, can realize the differential, so that it is possible to select whether or not the differential function is realized.

Specifically, as an example, the controller may be configured to:

acquiring an oil pressure detection value of a pressure sensor;

determining that the oil pressure detection value is smaller than the set pressure value;

controlling the electromagnetic switch valve 11 to conduct the oil cylinder communication oil way L0;

determining that the oil pressure detection value is not smaller than the set pressure value;

the electromagnetic switch valve 11 is controlled to disconnect the oil cylinder communication oil passage L0.

Therefore, the pressure is identified through the inside of the hydraulic system, the on-off of the oil cylinder communication oil way L0 is controlled, so that the differential function is realized, and the running speed of the oil cylinder is regulated. When the oil pressure detection value is smaller than the preset pressure value, the oil pressure representing the rodless cavity is not large, the load is not large, and the oil cylinder communication oil way L0 can be conducted at the moment so as to realize differential oil return of the rod cavity. When the oil pressure detection value is not smaller than the preset pressure value, the electromagnetic switch valve 11 is controlled to disconnect the oil cylinder communication oil path L0, namely the illustrated electromagnet Y03 is not electrified, and the rodless cavity oil normally returns through the one-way balance valve 6. In this embodiment, when the communication control valve 9 and the communication valve pilot oil passage X1 thereof fail, it is possible to ensure the on-off control and reliability of the cylinder communication oil passage L0.

In the present embodiment, the balance valve set pressure of the one-way balance valve 6 is adjustable and set to be greater than 1.3 times the load pressure. Therefore, parameters can be more reasonably adjusted by adjusting the set pressure of the balance valve, the pilot ratio, the opening pressure of the hydraulic control one-way valve and the like so as to realize automatic adjustment of the speed of the oil cylinder.

The hydraulic control system of the aerial working platform in the embodiment can be applied to various aerial working platforms.

Taking fig. 2 as an example, hydraulic oil of the aerial working platform reaches the gear pump 3 through the filter 2, and the gear pump 3 conveys the hydraulic oil to the main reversing valve 5 through the pump port check valve 4 for preventing backflow and oil return. The main reversing valve 5 is a proportional reversing valve, when the electromagnet Y01 is powered on, the current of the proportional electromagnet is controlled, the valve port passing flow of the main reversing valve 5 is regulated, hydraulic oil is pumped into a rodless cavity of the oil cylinder, and a piston rod is pushed to extend out, so that the running speed of the hydraulic oil cylinder 10 can be controlled.

Further, a pressure sensor, a stroke sensor and the like can be added into the system, and the running speed of the oil cylinder can be controlled by judging the pressure and the stroke and adjusting the magnitude of the current. However, the hydraulic system has the disadvantages of increased cost, more complex control logic, high failure rate and increased material quantity due to the addition of electric elements such as pressure sensors, stroke sensors and the like, and is unfavorable for after-sale maintainability. In the case of a stroke sensor without a pressure sensor, the speed of the hydraulic system is determined by the proportional control valve, so that the speed in the whole action process is constant, and in some cases, a differential function is required to be used, the situation of low speed can occur.

When the electromagnet Y01 is electrified, hydraulic oil enters the hydraulic control one-way valve 7 and then enters the rodless cavity of the oil cylinder, and meanwhile, pilot oil enters the pilot control cavity of the one-way balance valve 6. Assuming that the balance valve set pressure of the one-way balance valve 6 is 300bar, the pilot ratio is 4:1, the pilot cracking pressure is 75bar. When the pressure entering the hydraulic control one-way valve 7 is less than 75bar, the one-way balance valve 6 is not opened, and the oil return from the rod cavity of the oil cylinder returns to the rodless cavity through the hydraulic control one-way valve 7 to form a differential mode. When the pressure of the oil entering the hydraulic control one-way valve 7 is more than 75bar, the one-way balance valve 6 is opened, and the oil return of the rod cavity of the oil cylinder returns to the hydraulic oil tank 1 through the one-way balance valve 6 and the main reversing valve 5.

When the electromagnet Y02 is electrified, the pumped hydraulic oil passes through the main reversing valve 5 and then enters the one-way valve in the one-way balance valve 6 to enter the rod cavity of the oil cylinder. Meanwhile, the pilot oil enters the hydraulic control one-way valve 7, the hydraulic control one-way valve 7 is reversely opened, and hydraulic oil in a rodless cavity of the oil cylinder returns to the hydraulic oil tank 1 through the main reversing valve 5. The relief valve 8 serves to limit the maximum load pressure in the locked state and protect the cylinder.

According to the hydraulic system, the speed of the oil cylinder can be automatically adjusted through the optimization design of the internal structure of the hydraulic system, elements such as a pressure sensor and a stroke sensor are not required to be additionally increased by an electric control system, and the purposes of simplicity, economy and reliability are achieved. Specifically, the differential function is realized when the pressure is small by identifying the pressure in the hydraulic system, the speed is high, and the regulation of the speed of the oil cylinder is automatically realized by the common function when the pressure is large.

Meanwhile, the one-way balance valve of the rodless cavity of the oil cylinder is changed into the combination of the hydraulic control one-way valve 7 and the overflow valve 8, the price cost is lower, the opening pressure is smaller, and the hydraulic system is more energy-saving. The opening pressure of the one-way balance valve 6 is equal to the balance valve set pressure divided by the pilot ratio, and the opening pressure of the pilot-operated one-way valve 7 is equal to the load pressure divided by the pilot ratio.

In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (10)

1. A hydraulic control system for an aerial work platform, the hydraulic control system comprising:

the telescopic oil cylinder comprises a telescopic oil cylinder (10) and a main reversing valve (5), wherein a rod cavity working oil way (L1) is connected between a working oil port of the main reversing valve (5) and a rod cavity of the telescopic oil cylinder (10), and a rodless cavity working oil way (L2) is connected between the working oil port and the rodless cavity;

the one-way balance valve (6) is arranged in the rod cavity working oil way (L1), and a balance valve pilot oil way of the one-way balance valve (6) is connected with the rod cavity working oil way (L2);

the hydraulic control one-way valve (7) is arranged in the rodless cavity working oil way (L2) and enables hydraulic oil to flow to the rodless cavity through the hydraulic control one-way valve (7) and to be blocked reversely, the hydraulic control one-way valve (7) comprises a one-way valve pilot oil way (X0) for reversely opening the one-way valve, and the one-way valve pilot oil way (X0) is connected to the rod cavity working oil way (L1) between the one-way balance valve (6) and the main reversing valve (5);

and the oil cylinder is communicated with the oil circuit (L0), the rodless cavity and the rod cavity are communicated, and a communication control valve (9) for controlling the on-off of the oil circuit is arranged in the communication oil circuit.

2. The hydraulic control system of an aerial work platform of claim 1, wherein the hydraulic control system comprises:

and the overflow valve (8) is arranged in the rodless cavity working oil way (L2) in parallel with the hydraulic control one-way valve (7).

3. Hydraulic control system of an aerial working platform according to claim 1 or 2, characterised in that the communication control valve (9) is also a pilot-operated non-return valve and is arranged to allow hydraulic oil only to flow from the rod-like chamber to the rodless chamber and to be blocked in reverse, the communication control valve (9) comprising a communication valve pilot oil circuit (X1) for controlling the non-return valve opening pressure, the pilot oil of the communication valve pilot oil circuit (X1) originating from the rod-like chamber working oil circuit (L1) between the non-return balance valve (6) and the main reversing valve (5) and being used for driving the valve port locking of the communication control valve (9).

4. A hydraulic control system of an aerial working platform according to claim 3, characterised in that the communication control valve (9) is a normally closed valve, the non-return valve opening pressure of the communication control valve (9) being greater than the non-return valve opening pressure of the pilot operated non-return valve (7).

5. A hydraulic control system of an aerial working platform according to claim 3, characterized in that an electromagnetic switch valve (11) connected in series with the communication control valve (9) is further provided in the cylinder communication oil path (L0).

6. The hydraulic control system of an aerial working platform according to claim 5, wherein the electromagnetic switch valve (11) is a normally closed electromagnetic valve that normally opens an oil passage.

7. The hydraulic control system of an aerial work platform of claim 5, wherein the hydraulic control system comprises:

the pressure sensor is used for detecting the oil pressure of one end of the rodless cavity working oil way (L2) close to the main reversing valve (5); and

and the controller is used for controlling the on-off of the electromagnetic switch valve (11).

8. The aerial work platform hydraulic control system of claim 7, wherein the controller is configured to:

acquiring an oil pressure detection value of the pressure sensor;

determining that the oil pressure detection value is smaller than a set pressure value;

controlling the electromagnetic switch valve (11) to conduct the oil cylinder communication oil way (L0);

determining that the oil pressure detection value is not less than the set pressure value;

and controlling the electromagnetic switch valve (11) to disconnect the oil cylinder communication oil way (L0).

9. Hydraulic control system of an aerial working platform according to claim 1, characterised in that the balancing valve setting pressure of the one-way balancing valve (6) is adjustable and set to be greater than 1.3 times the load pressure.

10. An aerial work platform, characterized in that it comprises a hydraulic control system of an aerial work platform according to any one of claims 1-9.