JP3096971B2 - Joint structure of skin plate in open shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a joining structure between a front frame and a skin plate of an open shield machine.

[0002]

2. Description of the Related Art FIG. 13 shows a joint structure between a front frame and a skin plate of a conventional open shield machine. In the figure, 21 is a front frame, 2
Reference numeral 2 denotes a skin plate, and the skin plate 22 is divided into an upper skin plate 22a and a lower skin plate 22b. Reference numeral 23 denotes a skin plate guide protruding into the inside of the machine. A tail frame 24 is provided on the inside of the skin plate 22 and is recessed in a groove shape on the inside of the machine.
Are loosely fitted to the respective guides 25 with a margin.
Reference numeral 6 denotes a joining pin, and upper and lower skin plates 22a, 22b
Are connected to the front frame 21 by one joint pin 6 respectively.
Is joined to.

Therefore, the following problems have arisen.
In the first case, since one skin plate 22a and 22b are joined at one place, if the joint portion is broken by the concentration of stress, the function of the skin plate cannot be performed.

The second is a single skin plate 22a,
Since the joints 22b are joined at one place, the upper and lower joint surfaces of the skin plates 22a and 22b open outward (ground side) when correcting the yawing of the open shield machine or at the time of carving. During the opening, the soil plate enters and the skin plate cannot follow.

[0005] The third is skin plates 22a and 22b.
Since the skin plate guide 23 is attached to the tail frame guide 25 with a margin so that it slides smoothly, when the pitching correction is performed, the upper and lower skin plates 22a and 22a as shown in FIG. 22b is opened, earth and sand enter the tail frame guide 25, and sliding becomes impossible.

[0006]

The problem to be solved by the present invention is to maintain the function of the skin plate even if one joint pin is broken.
Another object of the present invention is to make it possible to follow the smooth without opening the skin plate even during the yawing correction or the curve. It is another object of the present invention to suppress the occurrence of troubles such as inability to slide or follow a skin plate even after pitching correction or after curve, and to enable smooth propulsion of an open shield machine. .

[0007]

The features of the present invention are as follows. That is, in order to maintain the function of the skin plate even if one joint pin is broken, a long hole in the front-rear direction is formed above and below the joint plate of the skin plate, and a center is formed between the upper and lower long holes. Each is provided with a circular hole. The skin plate is connected to the front frame so that the skin plate can be rotated up and down about the joint pin inserted into the circular hole with the joint pin inserted into the upper and lower slots and the circular hole. .

Also, when correcting yawing or pitching,
The skin plate can be divided into a plurality of stages up and down so that the skin plate can follow the skin plate even after the sliding, and the slide guides provided opposite to the upper and lower skin plates are provided with a common tail frame. Slidably accommodated in the guides so as to be parallel and not spaced apart from each other.

[0009]

1 to 7, reference numeral 1 denotes a front frame, reference numeral 2a denotes an inner joining plate of the front frame 1, and reference numeral 2b denotes an outer joining plate, which will be described later. It protrudes toward the skin plate 3 side. Skin plate 3
Is divided into an upper skin plate 3a and a lower skin plate 3b. Reference numeral 4a denotes an upper joint plate projecting from the upper skin plate 3a, and 4b denotes a lower joint plate projecting from the lower skin plate 3b. Have been.

Reference numerals 5a and 5b denote elongated holes in the front-rear direction, which are provided above and below the upper and lower joining plates 4a and 4b, respectively.
A circular hole 5 is provided at the center of each of the upper and lower slots 5a and 5b.
c is provided. On the other hand, joining plates 2 inside and outside the machine
A circular hole is provided in a, 2b at a position facing each of the holes 5a, 5b, 5c. Reference numerals 6a, 6b and 6c denote joining pins, 6a and 6b are inserted and fixed in the long holes 5a and 5b, and 6c is inserted and fixed in the circular hole 5c to join the front frame 1 and the skin plate 3.

Reference numeral 7a denotes an upper skin plate guide provided on the upper skin plate 3a, and 7b denotes a lower skin plate 3b.
2 is a lower skin plate guide provided in the first embodiment. An upper slide guide 8a is provided at the lower end of the upper skin plate 3a. A lower slide guide 8b is provided at the upper end of the lower skin plate 3b. The upper and lower skin plate guides 7a and 7b are, as shown in FIG.
Slidably fitted only in the front and rear. Also, as shown in FIG. 4, both the upper and lower slide guides 8a and 8b
Each of the tail frame guides 10 is slidably fitted only in the front and rear directions.

Reference numeral 11 denotes a guide frame, as shown in FIG.
It protrudes downward from the rear end of the upper slide guide 8a. A guide rod 12 projects rearward from the rear end of the lower slide guide 8b as shown in FIGS.
The guide rod 12 is slidably inserted into the guide frame 11. 12 'is a stopper.

FIGS. 9 and 10 show the joint pin 6 of the conventional skin plate in detail. The joining pin 6 for joining the joining plates 2a and 2b inside and outside the front frame 1 and the joining plate 4 of the skin plate 3 is formed at the base of the bolt 13. Then, a bolt 13 having a notch 13b provided in a flat bolt head 13a is inserted from outside the machine into a pin hole, and a stopper 15 fixed by welding to the outside machine joining plate 2b is brought into contact with the notch 13b.
The nut 14 was tightened from inside the machine.

However, such a conventional joining structure requires a work space for inserting the bolt 13 between the open shield machine and the shaft during assembly and disassembly of the open shield machine. As a result, the shaft becomes larger by that amount, and there is an inconvenience associated with danger due to work in a narrow space.

According to the present invention, as shown in FIG. 8, the nut 14 is fixed to the front side joining plate 2 by welding, and the bolt 13 having the joining pin 6 formed at the tip portion is fixed to the nut 14. The two joining plates 2 and 4 are joined by screwing. As a result, since joining can be performed only inside the machine, the shaft is small, and the work in the machine is safe. Further, since there is no outwardly protruding portion, the frictional resistance at the time of propulsion is reduced, and effects such as requiring less propulsion energy can be obtained.

Since the present invention is constructed as described above, if the front frame 1 is going to fall forward or the tail frame is going to fall backward, as shown in FIG. The pins 6a and 6b are elongated holes 5a and
5b, the upper joining pin 6a can move forward and the lower joining pin 6b can move backward with respect to the center joining pin 6c. Therefore, the upper and lower skin plates 3
a, 3b are respectively centered on the central joint pin 6c,
It falls relatively backward with respect to the front frame 1.

At this time, the upper slide guide 8a of the upper and lower skin plates 3a and the lower slide guide 8b of the lower skin plate guide 3b are slidably inserted into the same tail frame guide 10 only forward and backward. Has been
The lower slide guide 8b slides rearward, and the guide rod 12 at the rear end is supported by the guide frame 11. Therefore, since the lower skin plate 3b retreats in parallel with the upper skin plate 3a, there is no opening between the upper and lower skin plates 3a and 3b as in the conventional case. In addition, the skin plates 3a, 3b do not open outward.

Conversely, if the front frame 1 is going to rise forward or the tail frame is going to rise backward, FIG.
As shown by, the upper joint pin 6a moves backward, the lower joint pin 6b moves forward, and the upper and lower skin plates 3a and 3b move upward with respect to the front frame 1 around the center joint pin 6c as an axis. it can. At this time, the guide bar 12 of the lower slide guide 8b is supported by the guide frame 11, and the lower skin plate 3b moves forward with respect to the upper skin plate 3a.
There is no opening between the upper and lower skin plates 3a, 3b, and no opening to the outside.

Although the skin plate is divided into upper and lower parts in the illustrated example, the present invention can be applied to a case where only one skin plate is provided.
a and 8b are unnecessary. Further, the present invention can be implemented even if the skin plate is divided into three or more stages.

[0020]

According to the present invention, the skin plate is joined to the front frame by three joining pins, so that even if one joining pin is broken, the skin plate does not fall off, and its function is improved. Can be maintained.

Even after the yawing correction, the pitching correction and the curve, troubles such as the inability of the skin plate to slide and the ability to follow the skin plate can be suppressed, and the smooth open shield machine can be propelled. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of an open shield machine viewed from the inside.

FIG. 2 is a plan view showing a joint between a front frame and a skin plate.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a rear view of the guide frame.

FIG. 6 is a side view of a guide rod.

FIG. 7 is a rear view of the guide rod.

FIG. 8 is a cross-sectional view illustrating joining by a joining pin.

FIG. 9 is a cross-sectional view showing joining by a conventional joining pin.

FIG. 10 is a side view of FIG. 9;

FIG. 11 is a schematic side view showing a state in which the skin plate is relatively lowered with respect to the front frame.

FIG. 12 is a schematic side view showing a state in which the skin plate is raised rearward relative to the front frame.

FIG. 13 is a schematic side view showing a conventional joining structure.

[Explanation of symbols]

 Reference Signs List 1 front frame 3 skin plate 5a, 5b long hole 5c circular hole 6a, 6b, 6c joining pin 8a upper slide guide 8b lower slide guide

Claims (3)

(57) [Claims] An elongated hole in the front-rear direction is provided above and below a joint plate of a skin plate, and a circular hole is provided at the center of the upper and lower elongated holes, and inserted into the upper and lower elongated holes and the circular hole. An opener wherein the skin plate is connected to the front frame so that the skin plate can be rotated up and down around the joint pin inserted into the circular hole.
The joint structure of the skin plate in the field. 2. A skin plate is divided into a plurality of upper and lower stages, and slide guides provided to oppose the upper and lower skin plates are parallel to a common tail frame guide. And not to open the interval
2. The opener of claim 1, wherein the opener is slidably received.
Bonding structure of skin plate in a metal machine. 3. The joining pin is formed such that a tip end of a bolt screwed to a nut fixed to an inner joining frame of the front frame does not protrude from the outer joining frame. The joining structure of the skin plate in the open shield machine of 1 or 2.