KR20200113470A - Safety hydraulic control system for high-altitude work vehicle, and hydraulic control method using thereof - Google Patents

Abstract

The present invention relates to a safety hydraulic control system for a tower wagon, and a hydraulic control method using the same. According to the present invention, the safety hydraulic control system for a tower wagon comprises: a basket angle adjusting cylinder; a boom length adjusting cylinder installed inside a boom; a boom angle adjusting cylinder; an outrigger horizontal length adjusting cylinder; an outrigger vertical length adjusting cylinder; a boom length sensor; a boom angle sensor; a basket horizontality sensor; an outrigger length sensor; a landing sensor; a controller for transmitting a control signal; and a hydraulic pressure adjusting unit. According to the present invention, it is possible to prevent a tower work platform and an outrigger from being suddenly stopped.

Description

Safety hydraulic control system for aerial work vehicles, and hydraulic control method using hydraulic control system {SAFETY HYDRAULIC CONTROL SYSTEM FOR HIGH-ALTITUDE WORK VEHICLE, AND HYDRAULIC CONTROL METHOD USING THEREOF}

The present invention relates to a safety hydraulic control system for an aerial work vehicle, and a hydraulic control method using a hydraulic control system, and more particularly, to an aerial work platform and an outrigger operated by the drive of a hydraulic cylinder. The present invention relates to a safety hydraulic control system for an aerial work vehicle that allows the flow of hydraulic oil injected into cylinders to be attenuated, and a hydraulic control method using the hydraulic control system.

In general, a specially equipped vehicle refers to a vehicle equipped with special facilities and structures for performing a special task, and the specially equipped vehicle includes an ambulance, a fire engine, a cargo crane, a ladder truck, a crane, a truck crane, and an aerial vehicle.

Among the above-described specially equipped vehicles, high place work vehicles can work safely and conveniently from high places, and have mobility, so they are very useful in situations such as scaffolding work inside and outside buildings, temporary installation and maintenance work of telecommunication facilities, inspection and repair work of bridges, etc. Used.

Such an aerial work vehicle is constructed by installing a base frame on the chassis of a freight vehicle such as a truck, and mounting an aerial work platform to the base frame. In addition, outriggers are installed at the front and rear of the base frame so that high place work can be performed while stably supported on the floor.

Here, the boom and basket (boarding box) constituting the aerial platform are operated by the drive of the hydraulic cylinder as anyone can see, and the horizontal extension beam and the vertical extension beam constituting the outrigger are also driven by the hydraulic cylinder as anyone can know. It works by

However, in conventional aerial work vehicles, when the boom, basket, horizontal extension beam, and vertical extension beam reach the start and end points of a preset operating range, a hydraulic cylinder that operates the boom, basket, horizontal extension beam, and vertical extension beam. There was a problem that the drive stops suddenly.

Since such a problem involves impact, the service life of the aerial workbench and the outrigger is shortened, and there is a risk that the worker falls from the basket, especially when the worker is in the basket.

0001). Korean Patent Publication 10-2011-37498 (Publication date: 2011.04.13) 0002). Korean Patent Registration 10-0739111 (Registration date: 2007.07.06) 0003). Republic of Korea Patent Registration 10-1038523 (Registration date: 2011.05.26) 0004). Korean Patent Registration 10-0714730 (Registration date: 2007.04.27)

An object of the present invention is to be able to attenuate the flow rate of hydraulic oil injected into the hydraulic cylinders when the basket and the outrigger operated by the drive of the hydraulic cylinder are out of the preset safety range, so that the aerial workbench and the outrigger are suddenly started. It is to provide a means and a method to prevent it from stopping.

In addition, the problem to be solved by the present invention is not limited to the technical problems mentioned above, and other technical problems that are not mentioned are clearly to those of ordinary skill in the technical field to which the present invention belongs from the following description. It will be understandable.

The present invention in order to achieve the object of the present invention as described above,

trailer; A boom rotation shaft rotatably installed on the top of the trailer; A boom installed to be elevating on the boom rotation shaft; A basket installed at one end of the boom so that the angle can be adjusted vertically; And in the aerial work vehicle comprising a pair of outriggers respectively installed in the middle portion and the rear portion of the trailer,

A basket angle adjusting cylinder installed between the lower end of the basket and the end of the boom; A boom length adjusting cylinder installed inside the boom and performing an elevating operation of the boom; A boom angle adjustment cylinder installed between the lower end of the boom and the boom rotation shaft; An outrigger horizontal length adjustment cylinder installed at each of the outriggers and configured to adjust a horizontal distance between each of the outrigger legs; An outrigger vertical length adjustment cylinder installed on each of the outriggers and for adjusting the height of each of the outrigger legs; A boom length sensor for measuring an elevated degree of the boom; A boom angle sensor for measuring an angle between the boom and the trailer; A basket horizontal detection sensor for checking whether the basket is horizontally maintained in parallel with the ground; An outrigger length sensor measuring how far the legs of each of the outriggers are separated from the body; A landing detection sensor measuring how high the legs of each of the outriggers are; A controller for receiving signals from the boom length sensor, boom angle sensor, basket horizontal detection sensor, outrigger length sensor, and landing detection sensor and transmitting a control signal of the cylinder; And receiving the signal transmitted from the controller, the basket angle adjustment cylinder, boom length adjustment cylinder, boom angle adjustment cylinder, horizontal length adjustment cylinder, including a hydraulic control unit for operating by providing hydraulic oil to any one of the vertical length adjustment cylinder Provides an aerial vehicle equipped with a safe hydraulic control system.

The controller in the above includes a display that can visually provide the operation status of each component, and at least one of the basket angle adjustment cylinder, boom length adjustment cylinder, boom angle adjustment cylinder, horizontal length adjustment cylinder, and vertical length adjustment cylinder It is preferable to include a lever type control switch for manually directly controlling the.

The hydraulic control unit in the above preferably further comprises one or more proportional control valves to provide pressure to each of the basket angle control cylinder, boom length control cylinder, boom angle control cylinder, horizontal length control cylinder, and vertical length control cylinder. Do.

As a hydraulic control method of an aerial vehicle equipped with the above safety hydraulic control system, the hydraulic control unit 300 includes the basket angle control cylinder, boom length control cylinder, boom angle control cylinder, horizontal length control cylinder, and vertical length control. When providing pressure to one or more of the cylinders using hydraulic oil, a maximum pressure providing step (S1) of providing pressure at the maximum pressure; In the step (S1), if the operating degree of the cylinder to be operated is 80% or more of the maximum range, a first flow rate blocking step (S2) of blocking 50% of the flow rate of hydraulic oil flowing into the cylinder; In the step (S2), when the operating degree of the cylinder to be operated is 85% or more of the maximum range, a second flow rate blocking step (S3) of blocking 70% of the flow rate of hydraulic oil flowing into the cylinder; In the step (S3), if the operating degree of the cylinder to be operated is 90% or more of the maximum range, a first flow rate blocking step (S4) of blocking 85% of the flow rate of hydraulic oil flowing into the cylinder; And in the step (S4), if the operating degree of the cylinder to be operated is 100% of the maximum range, the flow rate blocking step (S5) of blocking 100% of the flow rate of hydraulic oil flowing into the cylinder is performed to operate the cylinder. It provides a hydraulic control method using a safe hydraulic control system that can control.

According to the present invention, when the aerial work table and the outrigger operated by the drive of the hydraulic cylinder are out of the preset safety range, the flow rate of the hydraulic oil injected into the hydraulic cylinders can be attenuated, so that the aerial work table and the outrigger are suddenly It is possible to prevent stopping, thereby providing an effect that not only enables safe and comfortable work, but also extends the life of the components.

1 is a schematic view showing a side portion of an aerial work vehicle equipped with a safety hydraulic control system according to the present invention.
2 is a view schematically showing a plan view of an aerial vehicle equipped with a safety hydraulic control system according to the present invention.
3 is a schematic structural diagram of the safety hydraulic control system of the present invention.
Figure 4 is a flow chart of a hydraulic control method using the safety hydraulic control system of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, a description of a function or configuration that is already known will be omitted in order to clarify the gist of the present invention.

In addition, terms used in the present specification are for describing exemplary embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase. As used in the specification, "comprises" and/or "comprising" does not exclude the presence or addition of one or more other elements.

1 is a view schematically showing a side part of an aerial vehicle equipped with a safety hydraulic control system of the present invention, and FIG. 2 is a schematic view showing a plan view of an aerial vehicle equipped with the safety hydraulic control system of the present invention to be. Hereinafter, a schematic installation and operation form of the safety hydraulic control system of the present invention will be described with reference to FIGS. 1 and 2.

As shown in Figs. 1 and 2, the safety hydraulic control system of the present invention is installed in a general aerial vehicle 10, wherein the aerial vehicle 10 includes a vehicle chain trailer 11 and the trailer 11 It is installed on the upper end and is installed at one end of the boom 13, which connects the boom 13 and the trailer 11 and connects the boom 13 and the trailer 11, and is installed at one end of the boom 13 and is angled up and down. Includes an adjustable basket (14).

In addition, a pair of outriggers 15 are installed at the middle and rear portions of the trailer 11, respectively. The outriggers 15 are for fixing the trailer 11 to the ground without shaking, and are installed a pair of left and right in the middle part and a pair of left and right at the rear part, like a general conventional outrigger.

And in order to adjust the angle by rotating the above components or to perform the lifting operation, a plurality of cylinders are installed. First, a boom length adjustment cylinder 402 (not shown) that performs an elevating operation of the boom 13 is installed inside the boom 13, and for adjusting the vertical angle of the boom 13 A boom angle adjustment cylinder 403 is installed between the lower end of the boom and the boom rotation shaft 12.

In addition, in order to adjust the angle of the basket 14 installed at the end of the boom 13, a basket angle adjustment cylinder 401 is installed between the bottom surface of the basket 14 and the end of the boom 13 .

And, each of the pair of outriggers 15 installed on the middle and rear portions of the trailer 11, respectively, is a horizontal outrigger for adjusting the horizontal distance of the legs of the outrigger 15 in a direction parallel to the ground. It includes a length adjustment cylinder 404, and an outrigger vertical length adjustment cylinder 405 for adjusting the height of the legs of the outrigger 15.

In order to apply the hydraulic control system of the present invention to the aerial vehicle 10 configured as described above, a boom length sensor 131 and a boom angle sensor 132 are installed inside the boom 13. The boom length sensor 131 is for measuring the elevation degree of the boom 13 that can be elevated by the boom length adjustment cylinder 402, and when measuring the operation degree of the boom length adjustment cylinder 402 It is possible to measure the elevation of the entire boom 13.

In addition, the boom angle sensor 132 is for measuring the angle formed by the boom 13 with the trailer. When measuring the degree of operation of the boom angle adjustment cylinder 403, the angle of the entire boom 13 is measured. Can be measured.

In addition, a basket horizontal monitoring sensor 141 that measures the rotated angle of the basket 14 and monitors whether the horizontal with the ground is maintained is installed on one side of the basket 14. The basket horizontal monitoring sensor 141 measures the rotation angle of the basket 14 and measures the degree of operation of the basket angle adjustment cylinder 401 in order to check whether the horizontal is maintained parallel to the ground.

In addition, an outrigger length sensor 151 and a landing sensor 152 are installed on the outriggers 15, respectively. The outrigger length sensor 151 measures the degree of operation of the outrigger horizontal length adjustment cylinder 404 to measure how far the legs of each of the outriggers 15 are separated from the body, and the landing detection sensor Reference numeral 152 measures the degree of operation of the vertical length adjustment cylinder 405 of the outrigger to determine how high the legs of each of the outriggers 15 are.

3 is a schematic structural diagram of the hydraulic control system of the present invention. Hereinafter, the configuration and operation of the hydraulic control system of the present invention will be described with reference to FIG. 3.

As described above, as a component included and installed to use the hydraulic control system of the present invention, the boom length sensor 131, the boom angle sensor 132, the basket horizontal detection sensor 141, the outrigger length sensor ( 151) and a landing detection sensor 152, and a basket angle adjustment cylinder 401, a boom length adjustment cylinder 402, a boom angle adjustment cylinder 403, a horizontal length adjustment cylinder 404 and a vertical length adjustment cylinder Includes 405.

In the state including the above components, the sensors 131, 132, 141, 151, 152 are connected to the controller 200, respectively. The controller 200 receives signals from the sensors 131, 132, 141, 151, 152 and transmits a control signal for controlling the cylinders 401, 402, 403, 404, 405 Do it.

Here, the controller 200 includes a display capable of visually providing the user with the operation status of each component provided from the sensors 131, 132, 141, 151, 152, and the cylinders 401 , 402, 403, 404, 405). It is preferable to include a control switch for operating. In particular, it is preferable that the control switch be a lever type switch in order to manually quickly operate or stop each cylinder.

And the hydraulic control system of the present invention further includes a hydraulic control unit 300. The hydraulic control unit 300 receives a control signal transmitted from the controller 200 and provides pressure to each of the cylinders 401, 402, 403, 404, 405 so that it can be substantially operated. Part.

In particular, a valve for providing pressure to the cylinders 401, 402, 403, 404, 405 should be included in the hydraulic control unit 300. In the hydraulic control system of the present invention, the hydraulic control unit 300 It is preferable to use a proportional control valve for the valve to be used.

Using the proportional control valve as described above is difficult to perform the gradual pressure cutoff operation step for the cylinder to be described below when using a conventional brush valve used to provide cylinder pressure, and to achieve this, the proportional control valve Because you have to use

4 is a flow chart of a hydraulic control method using the hydraulic control system of the present invention, which is a flow chart showing a process in which hydraulic oil is injected into each of the cylinders 401, 402, 403, 404, 405.

As shown in Fig. 4, when a user gives an operation command to one or more of the cylinders 401, 402, 403, 404, 405 through the controller 200, the hydraulic control unit ( In 300), hydraulic oil for pressure provision will be injected into the control target among the cylinders 401, 402, 403, 404, 405. For convenience of explanation, the following will describe the operation of the boom length adjusting cylinder 402 among the cylinders 401, 402, 403, 404, 405 as an example, and the remaining cylinders 401, 403, The operation of 404 and 405 is also the same.

When an operation command is given to the boom length adjustment cylinder 402, the injection of hydraulic oil starts.At this time, since there is no need to block the hydraulic oil at first, the hydraulic control unit 300 is the boom length adjustment cylinder at the maximum pressure without blocking. The maximum pressure providing step (S1) of providing pressure to 402 is performed.

At this time, the boom length sensor 131 that detects the operation of the boom length adjustment cylinder 402 detects the operation of the boom length adjustment cylinder 402 in real time and provides the current status to the controller 200. The controller 200 monitors the operation of the boom length adjustment cylinder 402 in real time, and checks whether the ascending degree of the boom 13 operated by the boom length adjustment cylinder 402 reaches 80% of the maximum ascent height. Confirm. If the degree of elevation of the boom 13 is less than 80% of the maximum elevation height, the step (S1) is continued.

And when the degree of elevation of the boom 13 reaches 80% of the maximum elevation height during the step (S1), the controller 200 controls the proportional control valve of the hydraulic control unit 300, and the boom length A first flow rate blocking step (S2) of blocking 50% of the flow rate of hydraulic oil flowing into the control cylinder 402 is performed.

While performing the step (S2), the controller 200 continuously checks the degree of elevation of the boom 13 transmitted by the boom length sensor 131. If the degree of elevation of the boom 13 is less than 85% of the maximum elevation height, the step (S2) is continued.

And when the degree of elevation of the boom 13 reaches 85% of the maximum elevation height during the step (S2), the controller 200 controls the proportional control valve of the hydraulic control unit 300, and the boom length A second flow rate blocking step (S3) of blocking 70% of the hydraulic oil flow rate flowing into the adjustment cylinder 402 is performed.

While performing the step (S3), the controller 200 continuously checks the degree of elevation of the boom 13 transmitted by the boom length sensor 131. If the degree of elevation of the boom 13 is less than 90% of the maximum elevation height, the step (S3) is continued.

And, when the degree of elevation of the boom 13 reaches 90% of the maximum elevation during the step (S3), the controller 200 controls the proportional control valve of the hydraulic control unit 300, and the boom length A third flow rate blocking step (S4) of blocking 85% of the flow rate of hydraulic oil flowing into the control cylinder 402 is performed.

While performing the step (S4), the controller 200 continuously checks the degree of elevation of the boom 13 transmitted by the boom length sensor 131. If the degree of elevation of the boom 13 is less than 100% of the maximum elevation height, the step S4 is continued.

And when the degree of elevation of the boom 13 reaches 100% of the maximum elevation during the step (S4), the boom 13 has risen to the maximum, which means that the operation of the boom length adjustment cylinder 402 is also the maximum value. It means that it worked up to. Accordingly, the controller 200 controls the proportional control valve of the hydraulic control unit 300 to perform a flow blocking step (S5) of blocking all of the hydraulic oil flow flowing into the boom length adjustment cylinder 402.

By gradually reducing the flow rate of the hydraulic oil flowing into the boom length adjusting cylinder 402 while passing through the steps (S2 to S5) as described above, the boom 13 is lifted or lowered even during the maximum operation of the cylinder 402 You can complete the motion smoothly without rattles when rotating.

In addition, in the above example, it was described according to the operation of the cylinder 402 that performs the lifting and lowering of the boom 13, but in the case of the cylinders 401 and 403 involved in the rotational operation, the measurement criterion of the above step is the maximum rotation angle. It will be based on. For example, when reaching 80% of the maximum rotation angle, reaching 85%, reaching 90%, reaching 100%, each step may be performed.

Since these lifting or rotating operations are substantially performed through the operation of the cylinders 401, 402, 403, 404, 405, when measuring the operation range in the steps (S1 to S5), the operation target It may be measured indirectly by measuring the degree of operation of one or more of the cylinders 401, 402, 403, 404, 405 that moves.

In the above, although specific embodiments of the present invention have been described and illustrated, the present invention is not limited to the described embodiments, and various modifications and variations can be made without departing from the spirit and scope of the present invention. It is self-evident to those who have. Therefore, such modifications or variations should not be individually understood from the technical spirit or point of view of the present invention, and the modified embodiments should be said to belong to the claims of the present invention.

10: Aerial work vehicle. 11: trailer.
12: boom rotation shaft. 13: Boom.
14: basket. 15: Outrigger.
131: boom length sensor. 132: Boom angle sensor.
141: basket horizontal detection sensor. 151: Outrigger length sensor.
152: landing detection sensor. 200: controller.
300: hydraulic control unit. 401: basket angle cut cylinder.
402: boom length adjustment cylinder. 403: boom angle adjustment cylinder.
404: horizontal length adjustment cylinder. 405: vertical length adjustment cylinder.

Claims (4)

trailer; A boom rotation shaft rotatably installed on the top of the trailer; A boom installed to be elevating on the boom rotation shaft; A basket installed at one end of the boom so that the angle can be adjusted vertically; And in the aerial work vehicle comprising a pair of outriggers respectively installed in the middle portion and the rear portion of the trailer,
A basket angle adjusting cylinder installed between the lower end of the basket and the end of the boom;
A boom length adjusting cylinder installed inside the boom and performing an elevating operation of the boom;
A boom angle adjustment cylinder installed between the lower end of the boom and the boom rotation shaft;
An outrigger horizontal length adjustment cylinder installed at each of the outriggers and configured to adjust a horizontal distance between each of the outrigger legs;
An outrigger vertical length adjustment cylinder installed on each of the outriggers and for adjusting the height of each of the outrigger legs;
A boom length sensor for measuring an elevated degree of the boom;
A boom angle sensor for measuring an angle between the boom and the trailer;
A basket horizontal detection sensor for checking whether the basket is horizontally maintained in parallel with the ground;
An outrigger length sensor measuring how far the legs of each of the outriggers are separated from the body;
A landing detection sensor measuring how high the legs of each of the outriggers are;
A controller for receiving signals from the boom length sensor, boom angle sensor, basket horizontal detection sensor, outrigger length sensor, and landing detection sensor and transmitting a control signal of the cylinder;
And receiving the signal transmitted from the controller, the basket angle adjustment cylinder, boom length adjustment cylinder, boom angle adjustment cylinder, horizontal length adjustment cylinder, including a hydraulic control unit for operating by providing hydraulic oil to any one of the vertical length adjustment cylinder A safe hydraulic control system for an aerial vehicle

The method of claim 1, wherein the controller includes a display capable of visually providing the operation status of each component, the basket angle adjustment cylinder, the boom length adjustment cylinder, the boom angle adjustment cylinder, a horizontal length adjustment cylinder, and a vertical length adjustment cylinder. A safety hydraulic control system for an aerial vehicle, characterized in that it comprises a lever-type control switch for manually directly controlling one or more of them
The method of claim 1, wherein the hydraulic control unit further comprises at least one proportional control valve to provide pressure to each of the basket angle control cylinder, boom length control cylinder, boom angle control cylinder, horizontal length control cylinder, and vertical length control cylinder. A safe hydraulic control system for an aerial vehicle, characterized in that it comprises
A method for controlling hydraulic pressure of an aerial vehicle equipped with the safety hydraulic control system of any one of claims 1 to 3, comprising:
When the hydraulic control unit 300 provides pressure using hydraulic oil to one or more of the basket angle control cylinder, boom length control cylinder, boom angle control cylinder, horizontal length control cylinder, and vertical length control cylinder, the maximum pressure Maximum pressure providing step (S1) to provide the pressure;
In the step (S1), if the operating degree of the cylinder to be operated is 80% or more of the maximum range, a first flow rate blocking step (S2) of blocking 50% of the flow rate of hydraulic oil flowing into the cylinder;
In the step (S2), when the operating degree of the cylinder to be operated is 85% or more of the maximum range, a second flow rate blocking step (S3) of blocking 70% of the flow rate of hydraulic oil flowing into the cylinder;
In the step (S3), if the operating degree of the cylinder to be operated is 90% or more of the maximum range, a first flow rate blocking step (S4) of blocking 85% of the flow rate of hydraulic oil flowing into the cylinder;
And in the step (S4), if the operating degree of the cylinder to be operated is 100% of the maximum range, the flow rate blocking step (S5) of blocking 100% of the flow rate of hydraulic oil flowing into the cylinder is performed to operate the cylinder. Hydraulic control method using a safe hydraulic control system, characterized in that to control.

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