RU2434803C1 - Device for telescoping truck crane 4-section boom - Google Patents

Abstract

FIELD: transport. ^ SUBSTANCE: invention relates to machine building and may be used in designing and operating automotive cranes. Proposed device comprises operator's joystick connected with hydraulic control valve, 4-section telescopic boom with pickup secured on the end of first section, and a mark made on second section at preset location other than section start. Second, third and fourth sections are mounted to travel along their axes driven by hydraulic cylinders communicated via hydraulic cline with hydraulic control valve. Proposed device is equipped with control system connected, on one side, with pickup, and, on the other side, with hydraulic control valve, and independent control element connected with control system. ^ EFFECT: higher efficiency, wideming possibilies. ^ 4 cl, 9 dwg

Description

The invention relates to mechanical engineering, in particular to crane construction, and can be used in the design and operation of truck cranes with a 4-section telescopic boom.

There is a method of extending a 4-section boom of an automobile crane (automobile boom crane KS-55717BRE, pp. 3-14 - 3-23, 2009), according to which at the beginning a package of three sections is put forward - the second, third and fourth. After full extension (full length) of the second section simultaneously, jointly extend to the end of the third and fourth sections of the boom. With this method of extension, the crane capacity is not fully used, the metal structure of the boom sections is underloaded

A device is known that implements the specified method of extending a 4-section telescopic boom of a truck crane (boom crane KS-55717BRE, pp. 3-14 - 3-23, 2009), containing a 4-section telescopic boom, two hydraulic cylinders, a control valve, a sensor, located at the end of the first section, a label located at the beginning of the second section, and an operator joystick. The operator, using the joystick, drives one of the hydraulic cylinders, which pushes the package out of three sections - the second, third and fourth. When the second section is fully extended, the sensor touches the mark (Fig. 2), after which the second and fourth sections synchronously extend with the second hydraulic cylinder (Fig. 3), the sections are retracted in the reverse order: first, the third and fourth sections are pulled into the second (figure 2), then the package of the second, third and fourth sections is pulled into the main first section (figure 1). The device adopted for the prototype does not fully use the lifting capacity of the crane, the design of the boom sections is underloaded.

The objective of the present invention, both in terms of the method and the device, is to increase the efficiency of the truck crane, expand its technical capabilities associated with increasing load capacity, based on the conditions of cargo stability, as well as ensuring maximum load on the crane based on the strength conditions of its design.

The specified problem in terms of the method is solved by the fact that in the proposed method of telescoping a 4-section boom of an automobile crane, which includes extending a packet of three sections - the second, third and fourth - in the first stage, synchronously extending the third and fourth sections to the end in the second stage, according to the invention, the second section of the boom is partially extended. When lifting loads of lower mass to a greater height, the second section of the boom is fully extended.

In terms of the device, the technical problem is solved in that a device for telescoping a 4-section boom of an automobile crane, comprising a main first section of the boom with a sensor fixed to its end, located inside the first section, coaxially with the second section with a mark, the third and fourth sections, installed with the ability to move along its axis with the help of hydraulic cylinders connected by hydraulic communication with the valve, operator joystick connected to the valve, according to the invention nabzheno control system connected via the electric connection, on the one hand, with the sensor on the other - with the control valve, independent control element associated with the control system, the label is attached to the second section at a location different from its beginning. An independent control element is made in the form of a button, connected to the control system via electrical communication. The operator joystick is connected to the directional control valve via mechanical coupling.

When implementing the proposed technical solution, the carrying capacity of a truck crane, subject to cargo stability, is increased by 15-17 percent. The effect is explained by the fact that, when the second section of the boom is not fully extended, the common center of mass of the boom is closer to the axis of rotation of the crane than with the traditional one. In addition, if with the traditional method of extension, most of the metal structure of the boom sections is underloaded, then in this case, from the point of view of strength, the structure works more rationally, in an extremely loaded mode. On the other hand, with the full extension of the second section of the boom, the proposed device operates in prototype mode, lifting loads of lower mass to a greater height. Thus, the efficiency of the device increases, its technical capabilities expand.

The invention is illustrated by drawings.

Figure 1 presents the diagram of the arrows in assembled form according to the prototype.

Figure 2 - the first stage, the promotion of the package of three sections according to the prototype.

In Fig.3 - the second stage, the synchronous extension of the third and fourth sections of the boom according to the prototype.

Figure 4 - diagram of the arrows in assembled form according to the invention.

Figure 5 - the first stage of the promotion of the package of three sections according to the invention.

6 is a second stage, the synchronous extension of the third and fourth sections of the boom according to the invention.

7 - full extension of the second section of the boom according to the invention.

On Fig schematically shows a General view of the device.

Figure 9 is a view A in figure 1.

The proposed method is implemented as follows. From the boom in the initial position (figure 4) put forward a package of three sections - the second, third and fourth. The second section is not fully extended (figure 5). In the second stage carry out the synchronous extension of the third and fourth sections (Fig.6). If necessary, when lifting a load of less weight to a greater height, carry out the full extension of the second section of the boom (Fig.7). Retract the arrows in the reverse order. First, the second section is partially retracted (Fig. 6). Then, the third and fourth sections are simultaneously pulled into the second (Fig. 5), after which the package of three sections - the second, third and fourth - is pulled into the main section. Section boom occupy its original position (figure 4).

The proposed device for telescoping a 4-section boom (Fig. 8) contains a telescopic boom consisting of a main section 1, a second section 2, a third section 3, a fourth section 4, a first hydraulic cylinder 5, a second hydraulic cylinder 6, a control valve 7, a control system 8, an operator joystick 9 connected to the control valve 7 via mechanical connection. The hydraulic cylinders 5, 6 are connected by hydraulic connection 10 to the control valve 7, which, in turn, is connected by electrical connection to the control system 8. At the end of the main section 1 there is a sensor 12 connected by electrical connection 11 to the control system 8. On the second label 13 is fixed to section 2. Label 13 can be located at any predetermined point other than the end, along the length of section 2, for example in the middle, at a distance of one third from the beginning or end of section 2. The control valve 7 vy the spool 14, the second valve 15. The apparatus further comprises an independent control element 16, made for example in the form of buttons and associated with the control system via an electrical connection.

The operation of the device is as follows. At the operator’s command, using the mechanical movement of the operator joystick 9, the first spool 14 of the control valve 7 opens. The working fluid pumped by the hydraulic pump pushes the piston of the first hydraulic cylinder 5, which is mechanically connected to the second boom section 2. Section 2 extends relative to section 1. Upon reaching the mark 13 of the sensor 12, the control system 8 generates an electrical signal that, by means of electrical connection 11, switches the solenoid valve of the control valve 7, and simultaneously, by hydraulic connection 10, the hydraulic fluid channels are switched from the first hydraulic cylinder 5 to the second hydraulic cylinder 6, thereby switching the extension of the sections from the second 2 to the third 3 and fourth 4. Boom sections - the third 3 and fourth 4 - extension are bent to the mechanical stop.

At the command of the operator using an independent control element 16, for example, by pressing a button, it is possible to fully extend the second section 2 to the stop.

The retraction of the boom sections is as follows. At the operator’s command, by mechanically moving the joystick 9 in the opposite direction, the second spool valve 15 of the control valve 7. opens. The working fluid pumped by the hydraulic pump draws the piston of the first hydraulic cylinder 5, which is mechanically connected to the second section 2. Partial retraction of section 2 relative to section 1 occurs. 13 of the sensor 12, the control system 8 generates an electrical signal, which, by means of electrical connection 11, switches the solenoid valve of the control valve 7, simultaneously but, through hydraulic connection 10, switching occurs hydraulic working fluid from the first channel to the second hydraulic cylinder 5, 6, thereby retracting the sections is switched from the second 2 to the third 3 and fourth boom sections 4. third 3 and fourth 4 are pushed against the mechanical stop. At the command of the operator, by pressing the button of the independent control element 16, it is possible to retract the second section 2 to the mechanical stop. The boom is fully assembled.

Claims (4)

1. A device for telescoping a 4-section boom of an automobile crane, comprising a main first section of the boom with a sensor fixed at its end, located inside the first section coaxially with the second section with a mark, the third and fourth sections, mounted to move along its axis using hydraulic cylinders connected by hydraulic connection to the control valve, an operator joystick connected to the control valve, characterized in that the device is equipped with a control system connected osredstvom electrical communication with one side of the sensor, on the other - with the control valve, independent control element associated with the control system, the label is attached to the second section in a predetermined position different from its beginning. 2. The device according to claim 1, characterized in that the independent control element is made in the form of a button. 3. The device according to claim 1, characterized in that the independent control element is connected to the control system through electrical communication. 4. The device according to claim 1, characterized in that the operator joystick is connected to the control valve by means of mechanical communication.

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