JPH061037B2 - Rollerbit support device for tunnel machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller bit supporting device for a tunnel excavator, and more particularly to a roller bit supporting device rotatably arranged on each spoke of a cutter wheel.

[Conventional technology]

7 and 8 show a tunnel machine, 1 is a shield main body, 2 is a cutter wheel attached to the front part of the shield main body 1, a cutter head 3 is provided at the center thereof, and a plurality of spokes 4 are provided at each spoke 4. The cutting bits 5 are fixed respectively.
Further, the cutter wheel 2 is rotatably supported by a bearing 7 provided in a partition wall 6 of the shield body 1 and can be rotated by a drive device 8 mounted on the partition wall portion 6.
Reference numeral 9 is a screw conveyor for carrying the earth and sand excavated by the cutter wheel 2 backward, and 10 is a shield jack.

In the above tunnel excavator, in order to enhance excavation in a gravel layer in which large gravel is mixed, each spoke 4 of the cutter wheel 2 is provided with a roller bit 11 consisting of a plurality of rollers as shown in FIG. Each is arranged.
These roller bits 11 are arranged at different radial positions from the center of rotation of the cutter wheel 2.

Next, an example of a conventional roller bit supporting device will be described with reference to FIGS. 9 to 11. In the figure, a roller bit 11 is rotatably supported by a shaft 12, and both ends of the shaft 12 are supported by a supporting member 13 so as not to rotate. The support member 13 is incorporated in the spoke 4 of the cutter wheel, and is fixed to the spoke 4 by a plurality of bolts 14 on the back side of the spoke 4 (inside the shield machine). Then, when an unexpected situation such as wear of the roller bit 11 occurs and the roller bit 11 needs to be replaced, the bolt 14 is removed to remove the support member 13 having the roller bit 11 from the spokes 4 inside the shield machine. It can be removed.

[Problems to be solved by the invention]

In the roller bit supporting device described above, the support member 13 including the roller bit 11 is removed by removing the bolts 14 from the spokes 4.
It has the advantage that it can be removed to the inside of the shield machine, but it has the following problems.

(1) Since the load F acting on the roller bit 11 is received by the tensile force of the bolt 14, the bolt 14 is easily damaged. Also, large bolts must be used to prevent damage to bolts 14.

(2) Since the number of bolts 14 is large, it takes a lot of time to replace the roller bit 11.

(3) When the roller bit 11 is replaced, the support member 13 is also integrally replaced, and therefore the handling weight at the time of replacement becomes heavy.

In order to prevent the problem of the above item (1), as shown in FIG. 12, the reaction force receiving member 15 of the roller bit 11 is fixedly mounted on the spoke 4, and the support member 13 is bolted to the reaction force receiving member 15. Some of them are attached by 16 so that the load F does not act directly on the bolt 16. This makes it possible to use a small bolt as the bolt 16, but causes a problem that the roller bit 11 cannot be removed inside the shield machine.

An object of the present invention is to enable replacement of only the roller bit including the shaft when replacing the roller bit, and to allow the roller bit to be taken out inside the shield machine, and to apply the load applied to the roller bit directly to the bolt as a tensile force. It is an object of the present invention to provide a roller bit supporting device for a tunnel excavator that can solve the above problems without operating.

[Means for Solving the Problems] The above object is to install a cutter wheel on the front part of the shield body, and to arrange a roller bit consisting of a plurality of rollers on each spoke of the cutter wheel. In a tunnel excavator in which a bit is rotatably supported by a shaft and both ends of the shaft are supported by support members fixed to the spokes, a shaft support hole of the support member has two tapered tapers. The surface is formed so that the taper surface faces the direction of the load applied to the roller bit, and a key groove is formed continuously from the inside of the shield machine to reach the bottom of the angled taper surface from the inside of the shield machine. And, on the other hand,
Tapered surfaces that match the tapered surfaces of the shaft support hole are formed at both ends of the shaft that supports the roller bit, and both ends of the roller bit support shaft are aligned with the tapered surfaces of the shaft support hole of the support member. This can be achieved by inserting and supporting, and inserting the taper key into the key groove, and fixing the rear end of the taper key to the support member with a bolt in a state where the tip of the taper key abuts against the back surface of the roller bit support shaft.

[Action]

The load (F) applied to the roller bit is received by the taper surface supporting the shaft of the support member, the component force due to the angle of this taper surface is applied to the taper key, and the component force due to the taper angle of the taper key causes the support member to move. Since it acts on the bolts that are fixed to the spokes of the cutter wheel, the load acting on this bolt is very small. When replacing the roller bit, the taper key can be removed and the shaft can be taken out through the key groove of the taper key to take out the roller bit including the shaft inside the shield machine.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. 1 is a plan view of a roller bit supporting device according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a view taken along the line III-III of FIG. 2, and FIG. FIG. 5 is a front view of the roller bit, FIG. 5 is a view taken along the line VV of FIG. 4, and FIG.
FIG. 3B is a sectional view with the taper key removed, and FIG. 6B is a sectional view with the roller bit removed. In this roller bit support device, tapered surfaces 12a and 12b having appropriate angles α and β are formed at both ends of a shaft 12 that rotatably supports the roller bit 11. A support member 13 for supporting the shaft 12 is incorporated in the spoke 4 of the cutter wheel and fixed to the spoke 4 by a bolt 17 on the rear surface side of the spoke 4. Further, in the shaft support hole of the support member 13,
Two taper surfaces 13a, 13b which are adapted to the taper surfaces 12a, 12b at both ends of the shaft 12 and have a mountain shape.
Is formed so that its tapered surface faces the load F applied to the roller bit. Then, the tapered surface 12
The wedge action of a, 12b and 13a, 13b fixes the shaft 12 to the support member 13 and prevents the shaft 12 from rotating. Further, inside the support member 13, there is formed a key groove 19 into which the taper key 18 is inserted from the inside of the shield machine. Then, by inserting the taper key 18 into the key groove 19 and abutting the tip of the taper key on the shaft 12, the shaft 12
The shaft 12 can be prevented from falling off and the shaft 12 can be positioned. The taper key 18 is fixed to the support member 13 with a bolt 20. Further, the key groove 19 is a shaft
It has a groove width larger than the outer diameter of the 12 ends. And
By removing the taper key 18 and passing the shaft 12 through the key groove 19, the roller bit 11 including the shaft 12 can be taken out to the inside of the shield machine. The taper surface at the end of the shaft 12
The angles α and β of 12a may be different angles or the same angle.

In the above embodiment, the load F applied to the roller bit 11
Is received by the taper surface 13b supporting the shaft 12 of the support member 13, the component force due to the angle (β) of the taper surface 13b is applied to the taper key 18, and the component force due to the taper angle of the taper key 18 is further supported. Will act on the bolts 17 that secure the to the spokes 4. This allows the bolt
The load (tensile force) acting on 17 becomes extremely small, and it becomes possible to use a small bolt as the bolt 17, and
The number of bolts can be reduced. Further, when replacing the roller bit 11, the bolt 20 is removed and the taper key 18 is pulled out as shown in FIG. 6 (a), and the shaft 12 is attached to the key groove 19 as shown in FIG. 6 (b).
The roller bit 11 including the shaft 12 is taken out to the inside of the shield machine by passing it through. As a result, the roller bit 11 can be taken out to the inside of the shield machine, and since only the roller bit 11 including the shaft 12 can be replaced, the handling weight at the time of replacement becomes small. When replacing the roller bit, the taper key 18 and the shaft 12 may be attached and detached.
Easy replacement work.

〔The invention's effect〕

 As described above, the present invention has the following effects.

(1) Since the load applied to the roller bit is not directly applied as a tensile force to the bolt fixing the support member to the spoke of the cutter wheel, the load applied to the bolt can be drastically reduced and a small bolt can be used.

(2) When replacing the roller bit, the roller bit can be taken out inside the shield machine. Further, when the roller bit is replaced, only the roller bit including the shaft is replaced, and the handling weight can be reduced. Further, when replacing the taper key, the taper key may be attached and detached and the shaft may be attached and detached to and from the support member, so that the exchange operation is simplified.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention. FIG. 1 is a plan view of a roller bit supporting device according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. Figure is III-I in Figure 2.
II arrow view, FIG. 4 is a front view of the roller bit, FIG. 5 is a VV arrow view of FIG. 4, and FIG. 6 (a) is a cross-sectional view with the taper key of FIG. 2 removed. FIG. 7B is a cross-sectional view with the roller bit removed, FIG. 7 is a vertical cross-sectional view of the tunnel excavator, FIG. 8 is a view taken along arrow VIII-VIII of FIG. 7, and FIG. 9 is a conventional roller. FIG. 10 is a sectional view of the bit supporting device, FIG. 10 is a view taken along arrow XX in FIG. 9, FIG. 11 is a state diagram with the roller bit removed, and FIG. 12 is also a sectional view of a conventional roller bit supporting device. 1 ... Shield body, 2 ... Cutter wheel, 4 ... Spoke, 11 ... Roller bit, 12 ... Shaft, 12a, 12b ... Tapered surface,
13 ... Support member, 13a, 13b ... Tapered surface, 17 ... Bolt, 18 ...
Taper key, 19 ... Keyway, 20 ... Bolt.

Claims (1)

[Claims] 1. A cutter wheel is attached to a front portion of a shield body, and a roller bit composed of a plurality of rollers is arranged on each spoke of the cutter wheel, and each roller bit is rotatably supported by a shaft. In addition, in a tunnel excavator in which both ends of the shaft are supported by supporting members fixed to the spokes, two shaft-shaped tapered surfaces are formed into roller bits in the shaft supporting holes of the supporting members. A key groove is formed so as to face the direction of the applied load and is continuous with the shaft support hole and extends from the inside of the shield machine to the bottom of the angled taper surface.
Tapered surfaces that match the tapered surfaces of the shaft support hole are formed at both ends of the shaft that supports the roller bit, and both ends of the roller bit support shaft are aligned with the tapered surfaces of the shaft support hole of the support member. A tunnel excavation characterized by inserting and supporting, and inserting a taper key into the key groove and fixing the rear end of the taper key to a support member with a bolt with the tip of the taper key abutting against the back surface of the roller bit support shaft. Roller bit support structure for machine.