JPH078730Y2 - Articulation mechanism of bending boom device of concrete pump - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint mechanism of a bending boom device for a concrete pump.

[0002]

2. Description of the Related Art Generally, in concrete pumps, a bending boom device supports a transportation pipe for pumping ready-mixed concrete to a concrete pouring place at a construction site. This refraction boom device is constructed so that it can be flexed freely with multiple joints, and at each joint, a transportation pipe for ready-mixed concrete made of steel pipe is arranged to the boom at the front stage where the transportation pipe for ready-mixed concrete made of steel pipe is arranged. The boom on the rear stage side is configured to rotate about, for example, one rotation axis and to be bent only in the vertical plane. In this bending boom device, although the bending boom device itself can be rotated in a horizontal direction as a whole by the rotation of the turntable to which the bending boom device is attached to operate each boom in a horizontal plane, Since the boom cannot be refracted at the same time in the vertical plane and the horizontal plane, that is, since the degree of freedom of each joint is 1, the trajectory drawn by the tip of the boom on the rear side is limited to one plane, and When trying to bring the tip to any position in the three-dimensional space, the workability was poor.

Therefore, a mechanism for simultaneously bending the rear boom with respect to the front boom in a vertical plane and in a horizontal plane is a bending boom device for a concrete pump, as disclosed in, for example, Japanese Utility Model Publication No. 62-14052. Proposed. The bending boom device includes a plurality of articulated arms having a transport pipe and an intermediate swivel device that connects two of the articulated arms, and the articulated arm is moved by the swivel motion and the elevation motion. The posture is changed in 360 degrees in a three-dimensional space. Therefore, the intermediate swivel device includes one rotary shaft connected to the end of the front articulated arm and another rotary shaft connected to the end of the rear articulated arm. Are orthogonal to each other at a predetermined distance, and the boom on the rear stage side can be simultaneously refracted in a vertical plane and a horizontal plane.

[0004]

However, in the conventional bending boom device for a concrete pump, the intermediate turning device is configured by disposing two orthogonal rotating shafts separately, and is installed in the boom on the front stage side. On the other hand, in order to change the posture of the boom on the rear stage side in a three-dimensional space by 360 degrees, that is, in order to have two degrees of freedom, a swing drive device composed of gears or the like is provided in the intermediate swing device. It was necessary to provide the boom on the latter stage side as a rotating mechanism for rotating in the horizontal plane, and the structure was complicated.

The present invention has been made to solve the above-mentioned problems, and its purpose is to make the posture of the boom on the rear side relative to the boom on the front stage side in any direction in a three-dimensional space with a simple structure. It is an object of the present invention to provide a joint mechanism for a bending boom device of a concrete pump, which can be changed to.

[0006]

SUMMARY OF THE INVENTION In the present invention, a front boom with a front transport pipe and a rear boom with a rear transport pipe are connected to one of the shaft sides. A right-angled hollow portion extending from the cylindrical support portion to the one cylindrical support portion on the other shaft side is connected via a cross-shaped joint pin having at least a formed cross-section, and the pair of opposing ends are connected to the connecting end of the boom on the front stage side. A yoke having a joint portion is provided, and a yoke having a pair of opposing joint portions is provided at the connecting end of the boom on the rear stage side, and the pair of joint portions of the yoke on the front stage side is connected to one shaft side of the cross joint pin. Rotatably mounted on both cylindrical support parts, and the pair of joint parts of the rear boom yoke are rotatably mounted on the other cylindrical support parts on the other shaft side of the cross joint pin, In the right-angled hollow part, A connecting pipe bent at a right angle is provided, and both ends of this connecting pipe are transported through a rotary pipe joint that is rotatable around both axes of the cross joint pin. It is characterized by being connected to a pipe.

[0007]

In the present invention, the rear boom rotates about one axis of the cross joint pin at the same time as it rotates about the other axis with respect to the front boom. That is, the boom on the rear stage side can rotate in two degrees of freedom around both axes of the cross joint pin, and can take any posture in the three-dimensional space.

On the other hand, when the boom on the rear stage side is rotated, the transport pipe on the rear stage side is rotated together with the boom on the rear stage side. That is,
Due to the rotating operation of both rotary pipe joints of the connecting pipe with respect to the transport pipe on the upstream side, the transport pipe on the downstream side rotates with two degrees of freedom.
In detail, the connecting pipe is connected to the transport pipe on the front side.
Rotate around one axis of the cruciform joint pin via one rotary pipe joint, and the transport pipe on the latter stage side with respect to the rotating connecting pipe, the other side of the cruciform joint pin via the other rotary pipe joint. Rotate around the axis of.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A joint mechanism of a bending boom device for a concrete pump according to an embodiment of the present invention will be described below with reference to FIGS. This bending boom device is rotatably installed in a horizontal direction on a turntable mounted on a concrete pump, and is configured to be bendable at a plurality of joints.
The joint mechanism in the joint is shown in the figure.

In the figure, reference numeral 1 denotes a front-stage boom, and a front-stage transportation pipe 2 having a tip bent at a right angle in a horizontal plane is arranged on the front-stage boom 1. . The yoke 3 on the front side is attached to the connecting tip of the boom 1 on the front side.
Is provided. The yoke 3 on the front stage side is formed in a U shape, and has a pair of joint portions 4 facing each other in the horizontal direction.
Have five. Each joint part 4 and 5 is a plate member 4A,
Support holes 4B and 5B are formed at the tip of 4A, respectively.

Reference numeral 6 denotes a rear-stage boom. The rear-stage boom 6 has a rear-stage transportation pipe 7 having a tip bent at a right angle in a vertical plane along the boom 6. It is arranged in a state of being supported by a bracket 6A fixed to the. At the rear end of the boom 6 on the rear stage side, the yoke 8 on the rear stage side
Is provided. The rear yoke 8 is formed in a U shape and has a pair of joint portions 9 facing each other in the vertical direction.
Have ten. Each joint part 9 and 10 is a plate material 9
Support holes 9B and 10B are formed at the tips of A and 10A, respectively.

Reference numeral 11 is a hollow cross-shaped joint pin, A
-Pipe 12 for A-axis and pipe 1 for BB-axis
3 are made to cross at right angles, and a cross-shaped hollow space 1 inside
4 are formed. Around the both ends of the pipe 12 related to the AA axis, the AA axis side cylindrical support portions 15 and 16 are formed,
On both outer peripheral sides of the pipe 13 related to the BB axis, BB axis side cylindrical support portions 17 and 18 are formed.

A connecting pipe 19 is provided in a right-angled hollow portion 14A, which is a part of the hollow space 14, and is bent at a right angle so as to penetrate therethrough. Reference numeral 20 denotes a first rotary pipe joint, which is a fixed flange 20A and a rotary flange 20B which is rotatable about the axis AA with respect to the fixed flange 20A.
It consists of and. The right end of the connecting pipe 19 is the first
It is connected to the rotary flange 20B of the rotary pipe joint 20,
The fixed flange 20A of the rotary pipe joint 20 is connected to the end of the transport pipe 2 on the preceding stage side. That is, the connecting pipe 19
Is rotatable about the AA axis with respect to the upstream side transport pipe 2 via the first rotary pipe joint 20.

Reference numeral 21 denotes a second rotary pipe joint, which is a fixed flange 2
1A and a rotary flange 21B which is rotatable around the BB axis with respect to the fixed flange 21A. The upper end of the connection pipe 19 is connected to the fixed flange 21A of the first rotary pipe joint 21, and the rotary flange 21B of the first rotary pipe joint 21 is connected to the end of the transport pipe 2 on the preceding stage side. That is, the transport pipe 7 on the rear stage side is rotatable about the BB axis with respect to the connecting pipe 19 via the second rotary pipe joint 21.

Both supporting holes 4B, 5B of the pair of joint parts 4, 5 of the yoke 3 of the boom 1 on the front side are provided with the cylindrical supporting parts 1 of the cross joint pin 11 on the AA axis side.
5 and 16 are rotatably mounted on the shaft. Further, both supporting holes 9B and 10B of the pair of joint portions 9 and 10 of the yoke 8 of the rear boom 6 are freely rotatable on both cylindrical supporting portions 17 and 18 of the cross joint pin 11 on the BB axis side. Is pivoted on.

Further, a first support bracket 22 is attached to the side surface of the boom 1 on the front stage side, and a spherical body 23B is swingably connected to the first support bracket 22 to a first spherical bearing 23A. A first hydraulic cylinder 24 having a base end portion 23 is attached. The tip portion 26 of the rod 25 of the first hydraulic cylinder 24 has a second spherical bearing 26.
A spherical body 26B is connected to A in a spherically swingable manner. A pair of plate members 9A of the yoke 8 of the boom 6 on the rear side,
On the side end surface of 10A, the first L-shaped brackets 6B and 6B are provided.
Are fixed side by side, and the first L-shaped bracket 6
The tips of B and 6B are integrally connected by a bar member 6C arranged in the vertical direction. The tip portion 26 of the rod 25 is attached to the rod member 6C.

On the other hand, a second support bracket 27 is attached to the bottom surface of the boom 1 on the front stage side, and a spherical body 28B is swingably connected to the second support bracket 27 to a first spherical bearing 28A. A second hydraulic cylinder 29 having a base end portion 28 is attached. The tip portion 31 of the rod 30 of the second hydraulic cylinder 29 has a second spherical bearing 31A.
The spherical body 31B is coupled to the spherical body so as to be swingable. Bottom surface 1 of plate material 10A of yoke 8 of boom 6 on the rear stage side
Second L-shaped brackets 6D and 6D (only one position is shown in the figure) are fixed to each other in line 0, and the tips of the second L-shaped brackets 6D and 6D are bar members 6E arranged in the lateral direction.
Are joined together. The tip portion 31 of the rod 30 is attached to the rod member 6E.

In the present embodiment, however, the operation of the second hydraulic cylinder 29 causes the boom 6 on the rear stage side to move the A- of the cruciform joint pin 11 relative to the boom 1 on the front stage side.
At the same time as rotating around the A axis, the first hydraulic cylinder 24
By the action of, the rotation about the BB axis is performed. That is, the boom 6 on the rear stage side rotates about both axes of the cruciform joint pin 11 with two degrees of freedom and takes an arbitrary posture in the three-dimensional space.

On the other hand, when the boom 6 on the rear stage side is rotated, the transport pipe 7 on the rear stage side is rotated together with the boom 6 on the rear stage side.
That is, with respect to the transport pipe 1 on the upstream side, the transport pipes 7 on the downstream side rotate with two degrees of freedom due to the rotating operation of the rotary pipe joints 20 and 21 at both ends of the connecting pipe 19. More specifically, the connection pipe 19 rotates about the AA axis of the cruciform joint pin via the first rotary pipe joint 20 with respect to the transport pipe 2 on the upstream side, and with respect to the rotating connection pipe 19. Then, the rear-stage side transport pipe 7 rotates around the BB axis of the cross joint pin 11 via the second rotary pipe joint 21.

Therefore, the joint mechanism between the front boom 1 and the rear boom 6 and the joint mechanism between the front transport pipe 2 and the rear transport pipe 7 each have two degrees of freedom. The tip of the boom 6 on the rear stage side is oriented in an arbitrary direction in a three-dimensional space and draws a locus in a predetermined spherical shape. According to the above-mentioned configuration, the boom 6 on the rear side is different from the boom 1 on the front side.
Uses a so-called universal joint mechanism that connects them to the joint mechanism of the front boom 1 and the rear boom 6 in order to change the posture in the three-dimensional space via the cross joint pin 11. The structure can be simplified. At this time, the connection structure of the front-stage side transport pipe 2 and the rear-stage side transport pipe 7 needs to be a structure capable of mutually three-dimensional operation.
4A and a connecting pipe 19 penetrating the right-angled hollow portion 14A, and a rotary pipe joint 2 at both ends of the connecting pipe 19
By using 0 and 21 as the constituent elements, the front-stage transport pipe 2 is simultaneously rotated around two axes with respect to the rear-stage transport pipe 7, and the degree of freedom is 2. Two
Also, the connection structure of the transport pipe 7 on the rear side can be easily configured.

In short, the transport pipe 7 on the rear side is provided with respect to the boom 1 on the front stage on which the transport pipe 2 on the front stage is arranged with a simple structure.
It is possible to change the posture of the boom 6 on the rear side where the is arranged in any direction in the three-dimensional space. In addition, in this embodiment, the right-angled hollow portion 14A is formed as a part of the hollow space 14, but it is sufficient if there is a space for penetrating only the connecting pipe 19, and for example, as shown in FIG. The V-shaped joint pin 11 may be formed with only the right-angled hollow portion 14A that accommodates the connecting pipe 19.

[0022]

As described above, according to the present invention,
In order to change the posture in the three-dimensional space, the boom on the rear stage with respect to the boom on the front stage is connected to the joint mechanism of the boom on the front stage and the boom on the rear stage via cross joint pins. Since a universal joint mechanism is adopted,
The structure can be simplified. At this time, it is necessary to make the connecting structure of the front-stage side transport pipe and the rear-stage side transport pipe so that they can be operated three-dimensionally with each other. By making the connecting pipe penetrating the right-angled hollow portion and the rotary pipe joints at both ends of this connecting pipe as constituent elements, the transport pipe on the front stage side is simultaneously rotated about two axes with respect to the transport pipe on the rear stage side. Therefore, the degree of freedom is set to 2, and the connecting structure of the transport pipe on the front stage side and the transport pipe on the rear stage side can be easily configured.

In short, with a simple structure, the posture of the boom on the rear stage with the transport pipes on the rear stage is set to any direction in the three-dimensional space with respect to the boom on the front stage with the transport pipes on the front stage. There is an effect that can be changed.

[Brief description of drawings]

FIG. 1 is a perspective view of a joint mechanism of a bending boom device for a concrete pump according to an embodiment of the present invention.

FIG. 2 is a side view seen from the same direction as the AA axis direction in FIG.

3 is a plan view seen from the same direction as the BB axis direction of FIG. 1. FIG.

FIG. 4 is a cross-sectional view taken along the line CC of FIG.

FIG. 5 is a cross-sectional view showing a modified example of the cross-shaped joint pin.

[Explanation of symbols]

 1 Boom on the front stage side 2 Transport pipe on the front stage side 3 Yoke on the front stage side 4, 5 Joint part 6 Boom on the rear stage side 7 Transport pipe on the rear stage side 8 Yoke on the rear stage side 9, 10 Joint part 11 Cross joint pin 14A Right angle hollow Part 15, 16 A-A shaft side cylindrical support part 17, 18 BB shaft side cylindrical support part 19 Connection pipe 20 1st rotary pipe joint 21 2nd rotary pipe joint

Claims (1)

[Scope of utility model registration request] 1. A front-stage boom having a front-stage transport pipe and a rear-stage boom having a rear-stage transport pipe are provided from one cylindrical support portion on one shaft side to the other shaft side. Which is connected via a cruciform joint pin having at least a right-angled hollow portion extending to one of the cylindrical support portions,
A yoke having a pair of facing joints is provided at the connecting end of the boom on the front side, and a yoke having a pair of facing joints is provided at the connecting end of the boom on the rear side. Part of the cross joint pin is rotatably mounted on both cylindrical support parts on one shaft side of the cruciform joint pin. A connecting pipe that is rotatably mounted on a cylindrical support part and has a connecting pipe bent at a right angle through the hollow part at the right angle, and both ends of this connecting pipe are rotated around both axes of the cross joint pin. A joint mechanism of a bending boom device for a concrete pump, characterized in that the joint mechanism is connected to a front-stage side transport pipe and a rear-stage side transport pipe via free rotary pipe joints, respectively.