JPH11200776A - Mounting structure of roller bit and rotating cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts involved in the attachment of a roller bit and facilitate the attachment and detachment of the roller bit in the mounting structure of the roller bit and a rotating cutter. SOLUTION: When a roller bit 5 is to be mounted from the chamber side of a shield machine, the roller shaft 10b of the roller bit 5 is inserted into the vertical groove 16 of a side wall 11b. When reaching the end of the vertical groove 16, the roller shaft 10a is inserted into a notched hole 12 of the sidewall 11a by sliding the roller bit 5 to the sidewall 11 a. And then a spacer 18 is inserted between the end face of the roller shaft 10b and the bottom of the end of the vertical groove 16, and in addition a support plate 17 is fitted into a T-groove 15 (15a), and then the support plate 17 is joined to the side wall 11b with a bolt 20, and the roller shaft 10b is fixed to the side wall 11b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure and a rotary cutter for a roller bit mounted on a tunnel excavator such as a shield machine, and more particularly to a mounting structure and a rotary bit for a roller bit used for excavating boulders and rock. About cutter.

[0002]

2. Description of the Related Art Generally, a shield excavator, which is a typical example of a tunnel excavator, has a rotary cutter for excavating a ground in front thereof, and a cutter frame of the rotary cutter has a roller bit used for excavating boulders and bedrock. Are mounted in the radial direction. In a shield machine equipped with such a rotary cutter, there is a shield excavator in which a roller bit can be attached from the chamber side at the rear of the rotary cutter in order to facilitate replacement of the roller bit.
No. 97 and Japanese Unexamined Patent Application Publication No. H8-1000059 describe this.

FIG. 9 shows a roller bit mounting structure described in Japanese Utility Model Publication No. 5-3597. In FIG. 9, a roller bit 45 includes a cutting roller 49 and the cutting roller 49.
Roller shafts 40a and 40b rotatably supporting the roller members 40a and 40b.
b and the spacers 48a, 48b support the roller brackets 41a, 41b.

When mounting the roller bit 45, the roller shafts 40a and 40b are inserted from the chamber side into the bearings S of the roller brackets 41a and 41b, and then the support members 47a and 4b are inserted into the notches T of the roller brackets 41a and 41b.
7b in the direction of arrow B, and
Spacers 48a, 48b are inserted in the direction of arrow A into the gap between the base end surfaces U of 1a, 41b and the mounting seats 46a, 46b,
Thereafter, the support members 47a, 47b and the spacers 48a, 48b are connected by the connecting bolts 44, and the connecting bolts 43 are connected.
Spacers 48a, 48b and mounting seats 46a, 46b
And

FIG. 10 shows a roller bit mounting structure disclosed in Japanese Patent Application Laid-Open No. 8-100988. 10, a roller bit 55 includes a cutting roller 59 and roller shafts 50a and 50 that rotatably support the cutting roller 59.
b, and the roller shafts 50a, 50b
a and 57b support the roller brackets 51a and 51b.

When mounting the roller bit 55, the roller shafts 50a, 50b are inserted into the bearing portions V of the roller brackets 51a, 51b from the chamber side, and subsequently, the support members 57a, 57b are inserted into the groove portions W of the roller brackets 51a, 51b.
b in the direction of arrow C, and then the support members 57a, 57b and the roller brackets 51a,
51b.

[0007]

The actual fairness 5 shown in FIG.
In the mounting structure of the roller bit described in JP-A-3597, the support members 47a and 47b and the spacers 48a and 48b are used.
The roller shafts 40a and 40b at both ends of the roller bit 45 are respectively
a, 41b. Also, the spacers 48a, 4
8b and the mounting seats 46a and 46b are connected by two connecting bolts 43, respectively, and the support members 47a and 47b and the spacers 48a and 48b are connected by two connecting bolts 44, respectively. For this reason, in the mounting structure of FIG. 9, the number of parts involved in mounting the roller bit 45 increases, which not only increases the manufacturing cost, but also takes time to mount and remove the roller bit 45.

On the other hand, Japanese Patent Application Laid-Open No. 8-1005 shown in FIG.
In the mounting structure of the roller bit described in Japanese Patent Publication No. 98, the roller shafts 50a and 50b are supported on the roller brackets 51a and 51b only by the support members 57a and 57b, and the support members 57a and 57b and the roller brackets 51a and 51b.
9 is simply connected with the connecting bolt 53, so that the number of components involved in mounting the roller bit 55 can be reduced as compared with the mounting structure of FIG.

However, even in the mounting structure shown in FIG. 10, the support members 57a and 57b are inserted into the groove portions W on both of the opposing roller brackets 51a and 51b, respectively.
Since the roller bracket 57b and the roller brackets 51a and 51b are respectively connected by the connecting bolts 53, the number of parts related to the mounting of the roller bit 55 is still large, and it takes time to mount and remove the roller bit 55.

In order to insert the supporting members 57a, 57b into the grooves W of the roller brackets 51a, 51b in the direction of arrow C, the cutting roller 59 and the roller brackets 51a, 51b are required.
Since a gap larger than the thickness of the support members 57a and 57b is required between the positions b, the space for mounting the set of roller bits 55 in the rotary cutter is increased. In this case,
Since the number of roller bits 55 attached to the cutter frame of the rotary cutter is limited, one roller bit 5
The digging load applied to 5 becomes large, and the blade of the cutting roller 59 is easily worn.

[0011] Of the plurality of roller bits attached to the rotary cutter, the roller bit at the outermost position is inclined radially outward with respect to the other roller bits so that the outermost portion of the face can be excavated. It is common to attach it. However, in the mounting structure of FIG. 10, as described above, the cutting roller 59 and the roller brackets 51a, 51
1b, a predetermined amount of gap is formed between the cutting rollers 5b.
9, the distance from the outer surface of the roller brackets 51a and 51b becomes longer. Therefore, in order to reliably excavate the outermost peripheral portion of the face, the roller bit 85 must be largely inclined outward in the radial direction. When the amount of inclination of the roller bit 85 is large, the roller bit 8 is rotated during the rotation of the rotary cutter 82.
5 occurs, the cutting edge of the cutting roller 89 wears, and the excavation efficiency decreases.

A first object of the present invention is to provide a roller bit mounting structure and a rotary cutter which reduce the number of parts involved in mounting the roller bit and facilitate the mounting and dismounting of the roller bit.

A second object of the present invention is to provide a roller bit mounting structure in which the mounting space for a set of roller bits can be reduced and the roller bits can be densely arranged on a rotary cutter.

A third object of the present invention is to provide a rotary cutter capable of reducing the inclination angle of the roller bit at the outermost peripheral position and improving the durability and excavation efficiency of the cutting roller.

[0015]

Means for Solving the Problems (1) The above first and second embodiments
In order to achieve the object of the present invention, the present invention provides a method for manufacturing a rotary cutter, comprising:
In a roller bit mounting structure for detachably supporting roller shafts at both ends of a roller bit inserted from the rear chamber side of a rotary cutter, one of the roller shafts at both ends of the roller bit is shorter than the other, and the holder is opposed to the holder. Of the side walls to be provided, one side wall is provided with a notch hole only to insert and support the shorter roller shaft, and the other side wall is provided with a removable fastening mechanism to support the longer roller shaft. I do.

As described above, by providing only the notch hole on one side wall and providing a detachable fastening mechanism only on the other side wall, the roller bit can be mounted more easily than when the fastening mechanism is provided on both side walls. The number of related parts can be reduced, so that the roller bit can be easily attached and detached.

Further, since one of the roller shafts at both ends of the roller bit is shorter than the other, the total length of the roller bit is shortened, and the space for mounting one set of roller bits on the rotary cutter is reduced, thereby rotating the roller bit. It can be densely arranged on the cutter frame of the cutter.

(2) In the above (1), preferably,
The fastening mechanism is formed on the inner wall surface of the other side wall, extends in the roller bit insertion direction from the chamber side, and terminates at a portion facing the notch hole. An orthogonal transverse groove, a spacer inserted between the end face of the longer roller shaft and the bottom surface of the end portion of the longitudinal groove to restrain the axial movement of the roller bit; It has a support plate that is inserted between the lateral groove and the chamber-side receiving surface and supports the roller shaft, and a bolt that detachably couples the support plate to the side wall. Thus, the longer roller shaft can be fixedly supported on the other side wall.

(3) In order to achieve the first and third objects, the present invention provides a rotary cutter having a plurality of roller bits mounted at a plurality of radial positions, wherein at least one of the plurality of radial positions is provided. (1) at the outermost position
And the roller bit is attached with the shorter roller shaft facing radially outward.

As a result, at least for the roller bit at the outermost peripheral position, the number of parts related to the mounting of the roller bit is reduced as described in (1) above, so that the roller bit can be easily attached and detached.

Further, by mounting the roller bit with the shorter roller shaft facing radially outward, the distance from the cutting roller of the roller bit to the outer surface of the side wall of the holder is shortened radially outward. The inclination angle of the roller bit for excavating the part can be reduced, which reduces the occurrence of slip of the cutting roller during rotation of the rotary cutter, reduces the wear of the cutting roller blade and improves the excavation efficiency I do.

[0022]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show a mounting structure of the roller bit 5 of the present embodiment. The roller bit 5 has a cutting roller 9 having a blade portion 9h for cutting a face.
And a roller shaft 1 that rotatably supports the cutting roller 9.
The roller shaft 10a has a shorter length than the roller shaft 10b, and the roller bit 5 is detachably attached to the holder 11 at these roller shafts 10a and 10b.

The holder 11 has a box-like shape in which the upper and lower sides are open, and one of the opposing side walls 11a and 11b.
Of these, only the notch hole 12 into which the shorter roller shaft 10a of the roller bit 5 is inserted is provided in the inner wall surface of the side wall 11a, and the longer roller shaft 10 is provided in the side wall 11b.
A removable fastening mechanism 30 for supporting b.

As shown in FIG. 5, the fastening mechanism 30 is provided on the inner wall surface of the side wall 11b, and is formed from a chamber-side (lower side in the figure) end to a position facing the notch hole 12, The vertical groove 16 has a T-shaped groove 15 including a horizontal groove portion 15b orthogonal to the terminal end. As shown in FIG. 6, the vertical groove 16 is formed deeper than the T-shaped groove 15 so that the roller shaft 10b of the roller bit 5 can be inserted from the chamber side (the back side in the drawing).

The fastening mechanism 30 is inserted between the end face of the roller shaft 10b and the bottom face of the end portion of the longitudinal groove 16 to restrict the movement of the roller bit 5 in the axial direction.
A T-shaped support plate 17 that is fitted in the T-shaped groove 15 and supports the roller shaft 10b; and a bolt that detachably connects the support plate 17 to the side wall 11b at the receiving surface 15a of the T-shaped groove 15 on the chamber side. 20.

Assuming that the length of the roller shaft 10a is Ra and the length of the roller shaft 10b is Rb, R
a <Rb. The total length R of the roller bit 5 is slightly shorter than the distance H between the inner wall surface of the side wall 11a and the bottom surface of the vertical groove 16 of the side wall 11b. From below) can be inserted into the vertical groove 16. The roller shaft 10
The length r from the end surface of the cutting roller 9 to the end surface of the cutting roller 9 on the roller shaft 10b side is slightly shorter than the distance h between the inner wall surface of the side wall 11a and the inner wall surface of the side wall 11b. 5 is inserted into the vertical groove 16 from the chamber side, the roller shaft 10b side end of the cutting roller 9 is
It does not hit the top of 1b.

When the roller shaft 10a is inserted into the notch hole 12, the distance t between the end surface of the roller shaft 10b and the bottom surface of the terminal end of the longitudinal groove 16 is slightly longer than the length Ra of the roller shaft 10a. A gap is generated, and the thickness of the spacer 18 that restrains the axial movement of the roller bit 5 also becomes t. Furthermore, in this embodiment, the roller shaft 10b of the cutting roller 9
It is assumed that a gap of t equal to the above occurs between the end surface on the side and the inner wall surface of the side wall 11b.

FIG. 7 shows a shield machine equipped with a rotary cutter to which the roller bit 5 is attached. In FIG. 7, the shield machine has a shield body 6, and a drive shaft 8 is rotatably supported on the bulkhead 4 of the shield body 6, and the rotary cutter 2 is connected to the drive shaft 8. The rotary cutter 2 is rotated by a rotary mechanism (for example, a hydraulic motor or the like) (not shown) to excavate the front face 1.
The earth and sand excavated by the rotary cutter 2 is taken into the chamber 3 between the rotary cutter 2 and the bulkhead 4, and is sent from the inside of the chamber 3 to the rear of the shield body 6 by the screw conveyor 7.

The rotary cutter 2 has a cutter frame 2A, and the above-mentioned roller bit 5 is mounted at a plurality of radial positions of the cutter frame 2A. Here, the roller bit 5 excluding the roller bit 5A at the outermost peripheral position is:
The roller shafts 10a and 10b are mounted perpendicular to the shield axis direction, and the outermost roller bit 5A
Is mounted at an angle α to the outside in the radial direction with respect to the other roller bit 5 so that the outermost peripheral portion J of the face 1 can be excavated. Each roller bit 5 is attached with the shorter roller shaft 10a facing radially outward.

In the embodiment constructed as described above, the roller bit 5 is inserted from the chamber 3 side of the shield machine.
When the roller bit 5 is mounted, the roller shaft 10b is inserted into the longitudinal groove 16 of the side wall 11b from the chamber 3 side, and the roller bit 5
The roller bit 5 is slid in the direction of arrow A when the end of the vertical groove 16 is reached, and the roller shaft 10a is inserted into the cutout hole 12 of the side wall 11a.
Next, a spacer 18 is inserted in the direction of arrow B between the end surface of the roller shaft 10b and the bottom surface of the end portion of the vertical groove 16, and the support plate 17 is further inserted into the T-shaped groove 15 in the direction opposite to the arrow A. The support plate 17 is connected to the side wall 11b by 20 and the roller shaft 10b is fixedly supported on the side wall 11b.

When removing the roller bit 5,
First, the bolt 20 is removed, the support plate 17 is pulled out from the T-shaped groove 15, and then the spacer 18 is taken out from between the end face of the roller shaft 10b and the bottom face of the vertical groove 16. Then, the roller bit 5 is slid in the direction opposite to the arrow A to pull out the roller shaft 10a from the notch hole 12, and then the roller bit 5 is moved in the direction opposite to the arrow C to be drawn into the chamber 3.

In this embodiment configured as described above, a detachable fastening mechanism 30 is provided only on the side wall 11b of the holder 11, and a cutout hole 12 for inserting the roller shaft 10a is provided on the side wall 11a. With the simple structure, the number of parts related to the mounting of the roller bit 5 can be reduced as compared with the case where the fastening mechanism is provided on both side walls 11a and 11b. As a result, not only the manufacturing cost is reduced, but also the work of replacing the roller bit 5 on site can be easily performed.

Further, since the length Ra of the roller shaft 10a is shorter than the length Rb of the roller shaft 10b, the total length R of the roller bit 5 is shortened, and the space for mounting one set of roller bits 5 in the rotary cutter 2 is reduced. Can be smaller. As a result, the number of the roller bits 5 can be increased and the cutter bits 2A can be densely arranged. In this case, the excavation load applied to one cutting roller 9 is reduced, and the wear of the blade portion 9a of the cutting roller 9 is reduced. it can.

Since the roller bit 5A at the outermost position of the rotary cutter 2 is mounted with the shorter roller shaft 10a facing radially outward, the roller bit 5A extends from the cutting roller 9 of the roller bit 5A to the outer surface of the side wall of the holder 11. The distance becomes shorter outward in the radial direction, and the inclination angle of the roller bit 5A for excavating the outermost peripheral portion J of the face 1 can be small. This will be described with reference to FIG.

FIG. 8A shows a state in which the roller bits 85 at the outermost position are tilted outward in the radial direction in order to excavate the outermost portion J of the face 1 when fastening mechanisms are provided on both side walls of the holder. It is shown. In this case, the distance from the center of the cutting roller 89 of the roller bit 85 to the outer surface of the side wall of the holder 81 is d1 on both the outside and inside in the radial direction, and the inclination angle of the roller bit 85 is β.

FIG. 8 (b) shows a state in which the roller bit 5A at the outermost position is inclined in order to excavate the outermost portion J of the cutting face 1 in the same manner as described above.
In this case, the distance from the center of the cutting roller 9 of the roller bit 5A to the radially outer side wall outer surface of the holder 11 is:
The radial inside is d1 as in FIG. 8A, and the radial outside is d2. Also, roller bit 5A
Is α as described above.

In the present embodiment, the shorter roller shaft 10a of the roller shafts 10a and 10b of the roller bit 5A is mounted radially outward as described above.
The distance d2 is shorter than the distance d1, so that the inclination angle α of the roller bit 5A is smaller than the inclination angle β in FIG. 8A. As a result, the slip of the cutting roller 9 of the roller bit 5A generated during the rotation of the rotary cutter 2 is reduced as shown in FIG.
As compared with (a), the wear of the blade portion 9a of the cutting roller 9 is reduced, and the excavation efficiency by the roller bit 5A is improved.

As described above, according to the present embodiment, the number of parts involved in mounting the roller bit 5 can be reduced, so that the roller bit 5 can be easily replaced.

Further, since the space for mounting the set of roller bits 5 in the rotary cutter can be reduced, the roller bits 5 can be densely arranged on the rotary cutter 2.

Further, since the inclination angle of the roller bit 5A at the outermost position for excavating the outermost portion J of the face 1 can be reduced, the blade portion 9 of the cutting roller 9 of the roller bit 5A can be reduced.
a can be reduced, and the excavation efficiency by the roller bit 5A can be improved.

In this embodiment, the shorter roller shaft 10a is attached to all the roller bits 5 so as to face radially outward. However, the present invention is not limited to this. Only the mounting structure of the roller bit 5A may be so configured.

Further, a T-shaped groove 15 including a vertical groove 16 and a horizontal groove portion 15b is provided on the inner wall surface of the side wall 11b of the holder 11,
The structure is such that the T-shaped support plate 17 is inserted into the T-shaped groove 15. However, the present invention is not limited to this. A flat support plate may be inserted between the shaft 10b and the chamber-side receiving surface of the lateral groove.

[0043]

According to the present invention, since a detachable fastening mechanism is provided only on one side wall of the holder, the number of parts involved in mounting the roller bit can be reduced, and the roller bit can be replaced from the chamber side. Easy to do.

Since the space for mounting one set of roller bits can be reduced, the roller bits can be densely arranged on the rotary cutter.

Further, since the inclination angle of the roller bit at the outermost peripheral position for excavating the outermost peripheral portion of the face can be reduced, the wear of the blade of the cutting roller of the roller bit can be reduced and the excavation efficiency can be improved. .

[Brief description of the drawings]

FIG. 1 is a front sectional view of a roller bit mounting structure according to an embodiment of the present invention.

FIG. 2 is a bottom view of the roller bit mounting structure shown in FIG. 1;

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a sectional view showing a cutout hole provided in one side wall of the holder shown in FIG. 1;

FIG. 5 is a sectional view showing a vertical groove and a T-shaped groove provided on the other side wall of the holder shown in FIG. 1;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a view showing a shield machine equipped with a rotary cutter to which the roller bit shown in FIG. 1 is attached.

8 is a view showing a difference between the inclination angle of the roller bit at the outermost peripheral position shown in FIG. 7 and the inclination angle of the roller bit at the outermost peripheral position when fastening mechanisms are provided on both side walls of the holder.

FIG. 9 is a view showing a conventional roller bit mounting structure.

FIG. 10 is a diagram showing another conventional roller bit mounting structure.

[Explanation of symbols]

 Reference Signs List 2 Rotating cutter 2A Cutter frame 3 Chamber 5 Roller bit 9 Cutting roller 10a, 10b Roller shaft 11 Holder 11a, 11b Side wall 12 Notch hole 15 T-shaped groove 15a Receiving surface 15b Horizontal groove portion 16 Vertical groove 17 Support plate 18 Spacer 20 Bolt 30 Fastening mechanism

Claims (3)

[Claims] 1. A roller bit mounting structure for detachably supporting roller shafts at both ends of a roller bit inserted from a rear chamber side of a rotary cutter between opposing side walls of a holder mounted on a cutter frame of the rotary cutter. In the above, one of the roller shafts at both ends of the roller bit is shorter than the other, and among the opposing side walls of the holder, only a notch hole is provided in one of the side walls, and the shorter roller shaft is inserted and supported, and A roller bit mounting structure, characterized in that a removable fastening mechanism is provided on a side wall of the roller bit to support a longer roller shaft. 2. The roller bit mounting structure according to claim 1, wherein the fastening mechanism is formed on an inner wall surface of the other side wall, extends from the chamber side in a roller bit insertion direction, and is formed in the notch hole. A longitudinal groove terminating at an opposing portion and a transverse groove orthogonal to the longitudinal groove near the terminus; and a shaft inserted between the end face of the longer roller shaft and the bottom surface of the terminating portion of the longitudinal groove. A spacer that restrains movement in the direction, a support plate that is inserted between the longer roller shaft and the chamber-side receiving surface of the lateral groove, supports the roller shaft, and the support plate is detachable from the side wall. A mounting structure for a roller bit, comprising: a connecting bolt. 3. A rotary cutter having roller bits mounted at a plurality of radial positions, wherein the roller bit mounting structure according to claim 1 is provided at least at an outermost peripheral position among said plurality of radial positions. A roller cutter having a roller bit with its roller shaft facing radially outward.