JPH0626625Y2 - Indication device for detecting the amount of breakage of shield machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an apparatus for detecting the amount of breakage of a medium-breaking shield machine.

[Conventional technology]

In the middle-breaking shield machine, when the middle-breaking jack connecting the shield and the rear shield is changed in stroke by changing left and right, the middle-breaking jack is shortened as shown in FIG. Side front shield 1
And the overlap amount l of the rear shield 2 is the overlap amount l'of the opposite side.
Get bigger. Therefore, if the increase / decrease of the overlapping amount 1 is detected, the amount of middle bending, that is, the inclination θ with respect to the rear shield can be known.

6 to 8 show a conventional example of the center bending amount detection instruction device based on this principle. The device comprises a center bending amount detection rod 5 having a base end fixed to a mounting seat 17 of the front shield 1 and a pointer 10 at the tip, and a scale plate 11 fixed to a mounting seat 18 of the rear shield 2. The amount of movement of the tip of the center bending amount detection rod 5 corresponding to the increase / decrease in the overlapping amount 1 of the front and rear shields 1 and 2 at the time of center bending can be read from the inside of the machine by the pointer 10 and the scale plate 11.

[Problems to be solved by the device]

However, in the above-mentioned conventional technique, as shown in FIG. 8, the distance between the pointer 10 and the scale plate 11 changes due to the inclination of the front shield 1, and the larger the overlapping amount l, the more the pointer 10 is scaled 11.
The parallax increases as the distance from the image increases. Also, before,
Since the shield 4 is provided on the sliding portions of the rear shields 1 and 2, the distance between the pointer 10 and the scale plate 11 changes due to the lateral deflection of the front shield, which causes a problem of poor reading accuracy.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide a center-bending detection instruction device with high reading accuracy.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a center bending amount detection rod having a base end attached to a front shield via a universal joint and a pointer at a tip, a guide member attached to a rear shield, and The tip of the bending amount detection rod is supported by the guide member so as to be movable in parallel with the axis of the rear shield, and includes a connecting member for guiding, and a scale plate attached to the guide member, The amount of movement of the tip of the rod for detecting the amount of bending in the middle due to the bending operation is indicated by a pointer and a scale plate.

[Action]

In the present invention, the base end of the center bending amount detection rod is attached to the front shield via the universal joint, and the tip is supported and guided by the guide member attached to the rear shield. In addition, the tip of the center bending amount detection rod always moves on a straight line parallel to the axis of the rear shield regardless of the lateral deflection of the front shield. Therefore,
The distance between the pointer provided at the tip of the center bending amount detection rod and the scale plate attached to the guide member can always be kept to a minimum, and accurate reading can be performed.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

The front shield 1 and the rear shield 2 are connected by a center-breaking jack 3, and the sliding portions of the front and rear shields are stopped by a seal 4.

The proximal end of the center bending amount detection rod 5 is fastened to one end of a universal joint (ball joint in the illustrated example) by a nut 8, and the other end of the universal joint 6 is attached to a mounting seat 7 provided on the front shield 1 by a nut. It is fastened by 9. As a result, the proximal end of the center bending amount detection rod 5 is attached to the front shield 1 in a state in which it is provided with degrees of freedom around two axes, vertical and horizontal. A pointer 10 is attached to the tip of the center bending amount detection rod 5, and a scale plate 11 to be combined with the pointer 10 includes a rear shield 2
It is attached to the guide member 12 fixedly attached to the rear shield 2 in parallel with the axis thereof.

The connecting member for connecting the tip of the center bending amount detecting rod 5 to the guide member 12 is composed of a bolt 14, a nut 15, and a collar 16, and the guide groove 13 and the collar 16 provided in the guide member 12 and the tip of the center bending amount detecting rod 5 are connected. To the bolt hole of the tab 5a provided on the
By passing through 14 and tightening the tab 5a with the nut 15, the tip of the center bending amount detection rod 5 is supported by the guide member 12 so as to be movable along the guide groove 13 in parallel with the axis of the rear shield 2. , And guide the movement.

Since the center-bending amount detection instruction device of this embodiment is configured as described above, when the center-folding jack 3 is actuated to bend the shield in the middle, the front shield 1 tilts as shown in FIG. However, the distance between the pointer 10 and the scale plate 11 is always kept to a minimum, and the pointer 10 is not moved to the scale plate 11 as in the conventional example shown in FIG.
The front shield 1
Even if the distance between the pointer 10 and the scale plate 11 does not change due to the lateral deflection, the amount of movement of the tip of the center bending amount detection rod 5 corresponding to the increase or decrease in the overlapping amount 1 of the front and rear shields 1 and 2 is accurately read. be able to.

This embodiment is an example of detecting and instructing the amount of center bending of the shield in the left-right direction. However, by installing a similar device on the circumference of the front and rear shields 1 and 2 at a position perpendicular to the drawing, the vertical direction It is also possible to instruct the detection of the amount of center fold. In FIG. 2, even when the front shield 1 is tilted in the vertical direction,
The center-bending amount detection rod 5 inclines to follow it, so that no unreasonable force is applied to the connecting portion.

[Effect of device]

According to the present invention, the tip of the center bending amount detection rod attached to the front shield does not depend on the inclination of the front shield, and
Regardless of the lateral deflection of the front shield, it always moves on a straight line parallel to the axis of the rear shield to keep the distance between the pointer provided at the tip of the rod and the scale plate attached to the rear shield to a minimum. Since it leans, it is possible to accurately read the amount of movement of the tip of the center-bending amount detection rod due to the center-bending operation.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a shield machine equipped with a device for detecting the amount of broken center of the present invention, FIG. 2 is a view taken along the line II-II of FIG. 1, and FIG. 3 is a line III-III of FIG. FIG. 4 is a sectional view, FIG. 4 is an operation state diagram of the device of the present invention, FIG. 5 is an explanatory view of detecting a center bending amount, and FIG. 6 is a cross sectional view of a shield machine equipped with a conventional center bending amount detection indicating device, FIG. 7 is a VII-VII arrow view of FIG. 6,
FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 1 ... Front shield, 2 ... Rear shield, 5 ... Middle bending amount detection rod, 6 ... Universal joint, 10 ... Pointer, 11 ... Scale plate, 12 ...
Guide member, 13 ... Guide groove, 14, 15, 16 ... Connecting member

Claims (1)

[Scope of utility model registration request] 1. A center-breaking shield machine, wherein a base end is attached to a front shield via a universal joint, a center-bending amount detecting rod having a pointer at a tip, and a guide member attached to a rear shield. A connecting member for supporting and guiding the tip of the center bending amount detection rod by the guide member so as to be movable parallel to the axis of the rear shield, and a scale plate attached to the guide member. An apparatus for instructing middle breakage amount detection of a shield machine, comprising a pointer and a scale plate for indicating the amount of movement of the tip of the middle breakage amount detection rod due to the middle breakage operation.