JP2023045143A - Intermediate drive device and installation method for intermediate drive device - Google Patents

Abstract

To provide an intermediate drive device that does not require highly accurate speed control and positioning control and facilitates the installation work of the intermediate drive device.SOLUTION: An intermediate drive device 100 comprises: a pair of drive pulleys 10a, 10b that are provided side by side with a space therebetween and around which a conveyor belt 5 is wound; a frame 20 that rotatably supports rotation shafts 11a and 11b of the pair of drive pulleys 10a and 10b; a pedestal 30 that supports the frame 20 integrally with the pair of drive pulleys 10a and 10b so as to be rotatable around a central axis 20a parallel to the rotation shafts 11a and 11b; and a drive unit 40 that rotationally drives the pair of drive pulleys 10a and 10b. The frame 20 is configured to be driven and rotated by an external drive machine 50 different from the drive unit 40.SELECTED DRAWING: Figure 2

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intermediate driving device for auxiliary driving a conveyor belt in the middle of a conveying route in a stretched belt conveyor for conveying excavated waste during tunnel excavation, and a method for installing the same.

2. Description of the Related Art Conventionally, there is known an intermediate drive device for a stretched belt conveyor for conveying excavated waste (rock masses, earth and sand, etc. excavated from the ground) during tunnel excavation (see, for example, Patent Document 1).

The above Patent Document 1 discloses that a booster drive (intermediate drive device) is provided in the middle of the extended conveying path when the belt conveyor is extended in accordance with the excavation site of the tunnel. The booster drive has a bearing housing that supports a base end of a first shaft connected to an electric motor via a speed reducer and a sprocket, and a drive gear, a swing arm, and a drive It has rollers. One end of the swing arm is supported by the first shaft via a bearing, and the other end of the swing arm supports the second shaft via a bearing. The second shaft is provided with a driven-side gear that meshes with the driving gear and a driven-side roller. The booster drive includes a fixture that fixes the swing arm in place, and a fixing pin that is inserted from the swing arm into the gear on the driven side to stop the rotation of the gear.

When the booster drive is installed, if the fixing pin is removed and the electric motor is driven with the fixing pin attached, the driving force is transmitted in the order of the first shaft, the driving gear, and the gear on the driven side. rotates about the first axis. The drive of the electric motor is stopped at an angle where the first shaft (driving roller) and the second shaft (driven roller) are horizontal. In this state, the conveyor belt is inserted so as to pass through a position above the roller on the driven side, a position between the driving roller and the roller on the driven side, and a position below the driving roller in this order. Then, the electric motor is reversely driven to rotate the swing arm in the opposite direction to the installation position of the fixture. As a result, the conveyor belt passed between the driving roller and the driven roller is wound around the driving roller and the driven roller in an S-shape. In this state, the swing arm is fixed with a fixture, and the fixing pin is removed from the gear on the driven side. As a result, the drive gear and the driven side gear are rotated by the driving force of the electric motor, and the conveyor belt can be driven by the rotated drive roller and driven side roller.

JP-A-10-316215

As described above, in the intermediate driving device of Patent Document 1, it is necessary to control the rotation speed of the swinging arm when rotating the swinging arm when installing the intermediate driving device. In addition, positioning control is required for accurately aligning the rotational position of the gear on the driven side (the fixing pin mounting hole of the gear) with the fixing pin insertion position. However, it is difficult to accurately perform speed control and positioning control with a normal conveyor belt drive motor. In principle, the above-mentioned conveyor belt winding work is performed only once when the intermediate driving device is installed. It is not reasonable from the point of view of cost and cost.

Further, in Patent Document 1, in the winding operation of the conveyor belt, the conveyor belt is moved from the upper position of the roller on the driven side through the position between the driving roller and the roller on the driven side to the position below the driving roller. The conveyor belt must be under tension for proper winding. Therefore, there is also a problem that the work of winding the conveyor belt is complicated and the work is highly difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and one object of the present invention is to eliminate the need for high-precision speed control and positioning control and to facilitate the installation work of an intermediate drive device. It is an object of the present invention to provide an intermediate driving device and an installation method of the intermediate driving device which can be made into a single structure.

In order to achieve the above object, an intermediate drive device according to a first invention is an intermediate drive device installed in the middle of a conveying path in a stretched belt conveyor for conveying excavated waste during tunnel excavation to assist the conveyor belt. A device comprising: a pair of drive pulleys spaced apart and around which a conveyor belt is wound; a frame rotatably supporting a rotation shaft of each of the pair of drive pulleys; and a pedestal for supporting rotation about a central axis parallel to the rotation axis, and a drive unit for rotating a pair of drive pulleys, wherein the frame is driven by an external drive device different from the drive unit. and is configured to rotate.

In the intermediate driving device according to the first aspect of the invention, with the configuration as described above, the frame that rotatably supports the rotation shaft of each of the pair of driving pulleys can be rotated while being supported by the mount. Therefore, in a state in which the rotation angle of the frame is adjusted in advance so that the pair of drive pulleys are arranged on the front side and the back side of the conveyor belt, respectively, in accordance with the direction in which the conveyor belt extends, A conveyor belt can be inserted. Then, after the conveyor belt is inserted, the work of winding the conveyor belt around the pair of drive pulleys can be easily performed simply by rotating the frame until the conveyor belt is sufficiently wound around the respective drive pulleys. In addition, since the frame is rotated by being driven by an external drive device different from the drive section that drives the pair of drive pulleys to rotate, the drive section does not require highly accurate speed control and positioning control. As a result, high-precision speed control and positioning control are not required, and the installation work of the intermediate driving device can be facilitated.

In the intermediate drive device according to the first invention, preferably, the frame is disposed on one side of the pair of drive pulleys in a direction along the rotation shaft, and is configured to cantilever each rotation shaft, The pair of drive pulleys is configured such that the conveyor belt can be inserted between the pair of drive pulleys from the opposite side of the frame along the rotating shaft. With this configuration, the intermediate driving device is slidably moved along the rotation shaft from the side of the conveyor belt while the rotation angle of the frame (the pair of drive pulleys) is adjusted in advance according to the direction in which the conveyor belt extends. A conveyor belt can be inserted between a pair of drive pulleys only. Therefore, the work of winding the conveyor belt around the pair of drive pulleys can be easily performed in a short time simply by performing the work of rotating the frame and the work of sliding the intermediate driving device.

In this case, preferably, the frame is provided on the first frame portion side with respect to each of the pair of rotation shafts, with the first frame portion and the second frame portion facing each other with a gap in the direction along the rotation axis. and a second bearing provided on the side of the second frame portion. With this configuration, even when the rotating shaft of each driving pulley is supported in a cantilever manner, the rotating shaft can be supported at a plurality of points along the axial direction. As a result, even with the cantilever support structure, it is possible to easily secure rigidity for supporting the tension of the conveyor belt during transport of the excavated muck.

In the intermediate driving device according to the first invention, preferably, the frame has a circular shape when viewed from the direction along the rotation axis, and the pedestal moves along the rotation direction on the outer peripheral portion of the circular frame. A support member is included to provide support. With this configuration, the structure for supporting the outer peripheral portion of the frame can easily realize a configuration for supporting the frame supporting the pair of driving pulleys so as to be rotatable by 360 degrees or more.

In the intermediate drive device according to the first aspect of the invention, preferably, the pair of drive pulleys are arranged on both sides of the central axis of the frame at positions equidistant from the central axis when viewed along the rotation axis. there is With this configuration, compared to the case where one drive pulley is arranged coaxially with the center axis of the frame and the other drive pulley is arranged away from the center axis, for example, the distance between the drive pulleys is the same. , the distance (radius) from the central axis of the frame to each drive pulley can be reduced. Therefore, it is possible to reduce the size of the frame that supports the pair of drive pulleys.

In this case, each of the pair of drive pulleys preferably has a drive gear that meshes with each other, and the drive section has a pinion gear that meshes with either drive gear according to the rotation angle of the frame. With this configuration, the drive section can be easily configured by simply rotating the frame to a position where one of the drive gears meshes with the pinion gear by utilizing the fact that the distances from the central axis of the frame to the drive pulleys are equal. and each driving gear can be connected so as to be able to transmit power.

In the intermediate driving device according to the first invention, preferably, the frame has a connecting portion with the external driving equipment, and is configured to be rotated by pulling the connecting portion in the circumferential direction with the external driving equipment. . With this configuration, the frame can be rotated by the traction force acting on the connecting portion. As a result, it is possible to use a simple traction mechanism instead of a large-scale device as the external driving equipment, so that the restrictions on the space and facilities required for the installation work of the intermediate driving device can be effectively alleviated.

In this case, the frame preferably has a plurality of connections along its perimeter, and the cradle deflects the rigging from the external drive equipment to direct the rigging towards any of the plurality of connections. It has a guiding part for guiding. According to this structure, the frame can be rotated by connecting the external drive equipment and any of the connecting portions with the rigging and pulling. At this time, since the direction of the pulling force acting on the connecting part is determined by the positional relationship between the guide part and the connecting part provided on the frame, there are restrictions on the position of the externally driven equipment (pulling direction) and the distance from the externally driven equipment to the frame. The frame can be driven in rotation without.

In the intermediate drive device according to the first invention, preferably, the frame is configured to support the frame so as to be rotatable by at least 360 degrees. With this configuration, the frame can be freely rotated over one rotation (360 degrees) or more. Therefore, regardless of the direction in which the conveyor belt extends, it is necessary to pre-adjust the rotational positions of the pair of drive pulleys according to the direction in which the conveyor belt extends, or to move the conveyor belt inserted between the pair of drive pulleys. The work of rotating the frame for winding can be easily performed.

A method for installing an intermediate driving device according to a second invention is a method for installing an intermediate driving device for auxiliary driving a conveyor belt in tunnel excavation work using a stretched belt conveyor, wherein during operation of the stretched belt conveyor, A frame supporting the rotation shaft of each of the pair of drive pulleys from the side in a cantilever manner, a frame rotatably supporting the frame, and the pair of drive pulleys, on the side of the conveyor belt at the installation position of the intermediate drive device. and a step of temporarily assembling an intermediate driving device comprising a drive unit for rotating and driving the stretching belt conveyor, and then laterally moving the temporarily assembled intermediate driving device from the side of the conveyor belt, Positioning the conveyor belt between a pair of drive pulleys and winding the conveyor belt around the pair of drive pulleys by rotating the frame with external drive hardware.

In the installation method of the intermediate driving device according to the second aspect of the invention, with the configuration as described above, after the intermediate driving device is temporarily assembled, the intermediate driving device is simply slid along the rotation shaft from the side of the conveyor belt. , a conveyor belt can be positioned between a pair of drive pulleys. The frame can then be rotated to wind the conveyor belt around the pair of drive pulleys. Since the frame is driven and rotated by external drive equipment, the drive unit does not require highly accurate speed control or positioning control. As a result, high-precision speed control and positioning control are not required, and the installation work of the intermediate driving device can be facilitated.

In addition, temporary assembly of the intermediate drive device and adjustment of the rotational angle of the frame (pair of drive pulleys) in accordance with the extending direction of the conveyor belt can be performed in advance while the stretch belt conveyor is in operation. After stopping the stretching belt conveyor, the conveyor belt can be wound around the pair of drive pulleys simply by performing the operation of sliding the intermediate driving device and the operation of rotating the frame. Therefore, the stop period of the stretching belt conveyor required for installing the intermediate drive can be effectively shortened. As a result, it is possible to contribute to the efficiency of tunnel construction.

According to the present invention, as described above, there is provided an intermediate driving device and an installation method for the intermediate driving device that do not require high-precision speed control or positioning control and that facilitate the installation work of the intermediate driving device. can provide.

1 is a schematic diagram showing the overall configuration of a stretching belt conveyor provided with an intermediate driving device; FIG. It is a schematic diagram for demonstrating the whole structure of an intermediate|middle drive. FIG. 4 is a schematic partial cross-sectional view along the axis of rotation showing one drive pulley and bearing structure; FIG. 4 is a schematic cross-sectional view of the intermediate drive along the axis of rotation of the drive pulley; FIG. 4 is a schematic diagram of a frame and a mount as viewed in a direction along the rotation axis from the drive pulley side; FIG. 4 is a schematic diagram of a frame and a pedestal viewed in a direction along the rotation axis from the drive gear side; FIG. 4 is a schematic diagram showing procedures (A) to (D) for winding a conveyor belt around a pair of drive pulleys. FIG. 4 is a schematic diagram showing a frame rotation procedure (A) to (C); FIG. 4 is a first diagram for explaining a method of installing an intermediate driving device; It is a second diagram for explaining the method of installing the intermediate driving device. It is a third diagram for explaining the method of installing the intermediate driving device. It is a fourth diagram for explaining the method of installing the intermediate driving device. It is the 5th figure for demonstrating the installation method of an intermediate drive. FIG. 11 is a sixth diagram for explaining the installation method of the intermediate driving device; FIG. 11 is a seventh diagram for explaining the installation method of the intermediate driving device; FIG. 11 is an eighth diagram for explaining the installation method of the intermediate driving device; FIG. 10 is a schematic view of the A cross section of FIG. 9 ; 11. It is an arrow directional schematic diagram of the B cross section of FIG. FIG. 14 is a schematic view of the C cross section of FIG. 13 ; 14. It is an arrow directional schematic diagram of the D cross section of FIG. FIG. 4A is a cross-sectional view of the intermediate head pulley and FIG. FIG. 4 is a schematic diagram of a frame and a pedestal according to a modification;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

The configuration of an intermediate driving device 100 according to one embodiment will be described with reference to FIGS. 1 to 8. FIG. The intermediate driving device 100 is a driving device for auxiliary driving the conveyor belt 5 installed in the middle of the conveying path in the stretching belt conveyor 200 for conveying excavated waste EM during tunnel excavation shown in FIG. First, an overview of the stretching belt conveyor 200 will be described.

(Overview of stretching belt conveyor)
As shown in FIG. 1, the stretching belt conveyor 200 is a conveying device for conveying excavated waste EM during tunnel excavation, and is a conveyor device capable of extending the conveying distance as the tunnel excavation work progresses. The excavated waste EM is rock masses, earth and sand excavated from the natural ground during excavation of the tunnel. The entrance opening of the tunnel is called the pithead 1, and the tip (innermost part) of the tunnel being excavated is called the face 2.

In the following description, the up-down direction (vertical direction) is defined as the Z direction, and the front-rear direction along the excavation direction of the tunnel is defined as the X direction. Of the X directions, the front side in the excavation direction (face 2 side) is defined as the X1 direction, and the rear side in the excavation direction (pithead 1 side) is defined as the X2 direction.

The stretching belt conveyor 200 comprises an intermediate drive 100 , a mobile crusher 110 , a tailpiece carriage 120 , a belt storage 130 , a main drive 140 and a head pulley device 150 .

The stretching belt conveyor 200 transports the excavated muck EM between the tail piece carriage 120 arranged on the front side (X1 side) in the excavation direction and the head pulley device 150 arranged on the rear side (X2 side) in the excavation direction. is a conveying system wound with a conveyor belt 5 of While the head pulley device 150 is fixedly installed, the tail piece carriage 120 is movably provided and moves as the face 2 advances. The conveyor belt 5 is an annular endless belt. Conveyor belt 5 is formed longer than the conveying length (path length from tail pulley 121 of tail piece carriage 120 to head pulley 151 of head pulley device 150) at the initial stage of installation of stretching belt conveyor 200. The excess length of the conveyor belt 5 is called the excess length. The extra length is stored in the belt storage 130 so that it can be retrieved.

Excavation waste EM generated by excavation of the tunnel excavation face (face 2) is collected by a transport vehicle H such as a wheel loader and thrown into a mobile crusher 110. As shown in FIG. The mobile crusher 110 crushes the large excavation muck EM to a size that can be transported, and then puts the crushed excavation muck EM into the tail piece cart 120 .

The excavated muck EM is loaded onto the conveyor belt 5 on the tailpiece carriage 120 . As the conveyor belt 5 is driven to circulate by the driving force of the main driving device 140, the excavated waste EM on the conveyor belt 5 is conveyed from the tail pulley 121 to the head pulley 151 arranged near the wellhead.

As the excavation of the tunnel progresses, the position of the face 2 moves, so the mobile crusher 110 and the tailpiece carriage 120 are moved forward in the excavation direction (X1 direction). Then, the excess length of the stored conveyor belt 5 is let out from the belt storage 130 by the amount that the tailpiece carriage 120 moves forward.

When the excess length stored in the belt storage 130 is all paid out, the operation of the stretching belt conveyor 200 is temporarily stopped, the existing conveyor belt 5 is partially cut, and a new conveyor belt 5 is added to the cut portion. After that, the operation of the stretching belt conveyor 200 is resumed. A new conveyor belt 5 is stored in belt storage 130 as excess length. By repeating the advance of the tailpiece carriage 120 and the extension of the new conveyor belt 5, the conveying distance of the stretching belt conveyor 200 increases.

When the conveying distance of the stretching belt conveyor 200 increases, the driving force of the main driving device 140 alone may be insufficient, or the belt tension may become excessive. Therefore, as shown in FIG. 1, an intermediate driving device 100 is installed in the middle of the conveying route. The installation position of the intermediate driving device 100 is between the face 2 side tailpiece carriage 120 and the wellhead 1 side device group including the belt storage 130 , the main driving device 140 and the head pulley device 150 . Thus, FIG. 1 shows the stretching belt conveyor 200 in a state in which the tunnel has progressed to some extent and the intermediate driving device 100 has been installed.

Some steps of the installation work of the intermediate driving device 100 are performed by suspending the operation of the stretching belt conveyor 200 . The intermediate driving device 100 of the present embodiment has a configuration that facilitates installation work and shortens the operation stoppage period of the stretching belt conveyor 200 .

(intermediate drive)
Next, the structure of the intermediate driving device 100 of this embodiment will be described. As described above, the intermediate driving device 100 is a belt driving device that is installed in the middle of the conveying path of the stretching belt conveyor 200 that conveys the excavated waste EM during tunnel excavation and that serves to auxiliary drive the conveyor belt 5 .

As shown in FIG. 2, the intermediate drive device 100 includes a drive pulley 10, a frame 20, a base 30, and a drive section 40 as main structures. In the following description, the direction along the rotation shaft 11 of the driving pulley 10 (the direction in which the rotation shaft 11 extends) is simply referred to as the "axial direction". In the installed state of the intermediate drive device 100 , the axial direction Ax (see FIG. 3) is parallel to the width direction of the conveyor belt 5 .

<Drive pulley>
The conveyor belt 5 is driven by the intermediate driving device 100 by winding the conveyor belt 5 around the driving pulley 10 and pulling the conveyor belt 5 using the surface friction of the driving pulley 10 . The intermediate driving device 100 is provided with a pair (two) of driving pulleys 10a and 10b in order to generate a frictional force corresponding to a large driving force, and employs a "tandem driving" system with the pair of driving pulleys 10a and 10b. there is

In order to increase the frictional force of the conveyor belt 5, the winding angle of the conveyor belt 5 around each drive pulley 10 is 180 degrees or more, preferably about 270 degrees. The winding angle of the conveyor belt 5 is the opening angle of the arc formed by the portion of the conveyor belt 5 in contact with the surface of the drive pulley 10 .

A pair of driving pulleys 10a and 10b are provided side by side with a gap therebetween. A pair of driving pulleys 10a and 10b have rotating shafts 11 (11a and 11b) extending parallel to each other. The same conveyor belt 5 is wound around each of the pair of drive pulleys 10a and 10b so as to be stretched over the pair of drive pulleys 10a and 10b.

Each of the pair of drive pulleys 10a, 10b has, but need not necessarily have, identical construction. Therefore, the structure of one drive pulley 10 will be described. FIG. 3 is an enlarged view showing the bearing structure of one drive pulley 10. As shown in FIG.

The drive pulley 10 has a cylindrical shape extending in the axial direction Ax. The drive pulley 10 has a length equal to or longer than the belt width of the conveyor belt 5 . The driving pulley 10 is provided on the one end P side of the rotary shaft 11 . The driving pulley 10 is integrated with the rotating shaft 11 by welding or the like. That is, the drive pulley 10 rotates integrally with the rotating shaft 11 .

The rotating shaft 11 is rotatably supported by a first bearing 12a and a second bearing 12b on the other end Q side opposite to the drive pulley 10 . The first bearing 12a and the second bearing 12b are housed in a cylindrical bearing housing 13 and held by shaft seals 14a, 14b and the like. The bearing housing 13 is attached to the frame 20 .

The other end Q of the rotating shaft 11 penetrates the frame 20 (bearing housing 13 ) and protrudes to the opposite side of the frame 20 from the drive pulley 10 . A driving gear 15 is attached to the other end Q of the rotating shaft 11 .

The intermediate driving device 100 includes two sets of the driving pulley 10, the rotating shaft 11, the bearing housing 13 (the first bearing 12a, the second bearing 12b, the shaft seals 14a and 14b) and the driving gear 15 configured as described above. (pair) provided. The rotating shaft 11, the bearing housing 13, and the driving gear 15 of the driving pulley 10a are hereinafter referred to as the rotating shaft 11a, the bearing housing 13a, and the driving gear 15a, respectively. The rotating shaft 11, the bearing housing 13, and the driving gear 15 of the driving pulley 10b are called the rotating shaft 11b, the bearing housing 13b, and the driving gear 15b, respectively.

<Frame and stand>
As shown in FIG. 4, the frame 20 is a support member that rotatably supports the rotation shafts 11a and 11b of the pair of drive pulleys 10a and 10b. The frame 20 of this embodiment is rotatable around the central axis 20a while being rotatably supported around the rotary shafts 11a and 11b. As will be described later, the frame 20 is configured to be driven and rotated by an external driving device 50 (see FIG. 8) different from the driving section 40 . A center axis 20 a of the frame 20 is parallel to the axial direction Ax of the driving pulley 10 .

The frame 20 has a circular shape (see FIG. 2) when viewed from the axial direction Ax (the direction along the rotation axis 11). The frame 20, as shown in FIG. 3, includes a first frame portion 21 and a second frame portion 22 facing each other with a gap in the axial direction Ax. The first frame portion 21 and the second frame portion 22 are fixed to each other by a connecting portion 23 extending in the axial direction Ax. As described above, the frame 20 is provided with two bearing housings 13a and 13b (see FIG. 4).

As shown in FIG. 4, each of the two bearing housings 13a and 13b is connected to the first frame portion 21 at one end in the axial direction Ax, and is connected to the second frame portion 22 at the other end in the axial direction Ax. . Each first bearing 12a is provided at one end inside the bearing boxes 13a and 13b, and each second bearing 12b is provided at the other end inside the bearing boxes 13a and 13b. That is, the frame 20 has a first bearing 12a provided on the first frame portion 21 side and a second bearing 12b provided on the second frame portion 22 side with respect to each of the pair of rotating shafts 11a and 11b. ,including.

The frame 20 is disposed on one side of the pair of drive pulleys 10a and 10b along the rotation shafts 11a and 11b, and is configured to cantilever the respective rotation shafts 11a and 11b. In other words, the pair of drive pulleys 10a and 10b are provided to protrude from the frame 20 toward the one end P side in the axial direction Ax. One end P side of the pair of driving pulleys 10a and 10b is a free end without a supporting structure. Therefore, a gap SP is provided between the pair of drive pulleys 10a and 10b, with the other end Q side blocked by the frame 20 and the one end P side open. As a result, the pair of drive pulleys 10a and 10b can insert the conveyor belt 5 between the pair of drive pulleys 10a and 10b from the opposite side (one end P side) of the frame 20 along the rotation shafts 11a and 11b. is configured to

As shown in FIG. 5 , the two rotating shafts 11 a and 11 b are installed at positions equidistant from the center axis 20 a of the frame 20 . The rotation shafts 11 a and 11 b are arranged symmetrically with respect to the central axis 20 a of the frame 20 when viewed from the axial direction Ax. Therefore, the pair of driving pulleys 10a and 10b are arranged on both sides of the central axis 20a of the frame 20 at positions equidistant from the central axis 20a when viewed from the direction along the rotating shaft 11 (axial direction Ax). there is

In FIG. 4, the driving gears 15a and 15b are installed at the other ends Q of the rotating shafts 11a and 11b of the driving pulleys 10a and 10b, respectively, as described above. As shown in FIG. 6, when viewed from the axial direction Ax, the drive gears 15a and 15b have a reduction ratio of 1:1 at a position where the distances between the bearing centers are equal (that is, at the midpoint between the rotating shafts 11a and 11b). 1 are meshing with each other.

Thus, each of the pair of drive pulleys 10a, 10b has drive gears 15a, 15b that mesh with each other. Therefore, when either one of the drive gears 15a and 15b is driven, the drive pulleys 10a and 10b rotate at a constant speed in opposite directions. Each of the drive gears 15a and 15b can mesh with a pinion gear 44, which will be described later, at a position on the outer peripheral side of the frame 20 opposite to the meshing position.

As shown in FIG. 5, the frame 20 is supported by a base 30. As shown in FIG. The pedestal 30 is configured to integrally support the frame 20 with the pair of drive pulleys 10a and 10b so as to be rotatable about a central axis 20a parallel to the rotation shafts 11a and 11b. When the rotation angle range of the frame 20 is limited, it is preferable that the frame 30 supports the frame 20 so as to be rotatable by at least 270 degrees. More preferably, the cradle 30 supports the frame 20 so as to be rotatable at least 360 degrees. In this embodiment, the frame 30 rotatably supports the frame 20, and the frame 20 can be rotated any number of times (720 degrees, 960 degrees, etc.) (the rotation angle range of the frame 20 is unlimited). .

The mount 30 includes an annular support portion 31 surrounding the circular frame 20 and a base portion 32 on which the support portion 31 is installed. The mount 30 includes a support plate 33 that supports the outer peripheral portion of the circular frame 20 so as to be movable along the rotational direction. As a result, the frame 20 is rotatably supported by the pedestal 30 at its circular outer peripheral portion. The support plate 33 is an example of a "support member" in the claims.

The support plate 33 is configured to slidably support (for example, slidably support) the outer peripheral portion of the frame 20 . The support plate 33 is provided on the inner peripheral surface of the annular support portion 31 . The support plates 33 are provided at a plurality of locations in the circumferential direction along the outer peripheral portion of the frame 20 .

Further, the frame 20 is provided with a structure for switching the fixed state of the frame 20 between a state in which the frame 20 is rotatable with respect to the pedestal 30 and a state in which the frame 20 is fixed to the pedestal 30 .

Specifically, as shown in FIG. 6, an annular fixing flange 24 is provided on the outer peripheral portion of the frame 20 . In addition, as shown in FIG. 4 , one fixing flange 24 is provided on each outer peripheral portion of the first frame portion 21 and the second frame portion 22 . The fixing flange 24 is provided so as to protrude radially outward from the outer peripheral portion of the frame 20 (the first frame portion 21 and the second frame portion 22). The fixing flange 24 is provided so as to straddle each frame portion (the first frame portion 21 and the second frame portion 22 ) and the pedestal 30 .

As shown in FIG. 6, the fixing flange 24 is provided with a plurality of bolt insertion holes (not shown) arranged in two rows on the inner peripheral side and the outer peripheral side along the circumferential direction. The frame 20 (the first frame portion 21 or the second frame portion 22) and the fixing flange 24 are fixed by the inner row bolts 25a inserted into the bolt insertion holes on the inner peripheral side. The fixing flange 24 and the frame 30 are fixed by the outer row bolts 25b inserted into the bolt insertion holes on the outer peripheral side. In each of frame 20 (first frame portion 21 and second frame portion 22) and frame 30, a plurality of screw holes (not shown) for fixing bolts are formed at the same pitch as the bolt insertion holes. ing. The frame 20 is fixed to the frame 30 via the fixing flange 24 by the inner row bolts 25a and the outer row bolts 25b. By removing the outer row bolts 25 b , the frame 20 becomes rotatable with respect to the base 30 .

A connection portion 26 for connecting to an external driving device 50 (see FIG. 8) is provided on the outer peripheral portion of the frame 20 . The frame 20 is configured to be rotated by pulling the connection portion 26 in the circumferential direction by means of an external driving device 50 . The frame 20 has a plurality of connecting portions 26 along its outer periphery.

In one example, the connecting portion 26 is a connecting hook for connecting the rigging 55 (see FIG. 8). Specifically, the connecting portion 26 is provided on the outer peripheral portion of the fixing flange 24 . A plurality of connecting portions 26 are provided at intervals in the circumferential direction of the fixing flange 24 . In the example of FIG. 8, four connecting portions 26a to 26d are arranged at intervals of 90 degrees.

5, the base portion 32 of the frame 30 is provided with a guide portion 34 for guiding the rigging 55 (see FIG. 8). The guide portion 34 bends the direction of the rigging 55 from the external drive equipment 50 (see FIG. 8) and guides the rigging 55 toward one of the plurality of connecting portions 26 . In this embodiment, the guide part 34 is a pulley rotatable around the central axis. The guide portion 34 is arranged below the frame 20 when viewed in the axial direction Ax of the frame 20 and between the center of the frame 20 and the outermost peripheral portion of the frame 20 in the horizontal direction.

<Drive part>
As shown in FIG. 4, the drive unit 40 rotates the pair of drive pulleys 10a and 10b. The drive unit 40 has a pinion gear 44 (see FIG. 6) that meshes with one of the drive gears 15a and 15b according to the rotation angle of the frame 20. As shown in FIG. In FIG. 4, the drive unit 40 includes a drive motor 41, a coupling 42, a speed reducer 43, and a pinion gear 44. As shown in FIG.

A pinion gear 44 is attached to the output shaft of a speed reducer 43 that is connected to the drive motor 41 through a coupling 42 . The pinion gear 44 meshes with one of the drive gears 15a and 15b. In the state of FIG. 4, the power of the drive motor 41 is transmitted to the drive gear 15b of the drive pulley 10 via the coupling 42, the speed reducer 43, and the pinion gear 44, and is also transmitted to the drive gear 15a meshing with the drive gear 15b. transmitted. As a result, the pair of drive pulleys 10a and 10b connected to the drive gears 15a and 15b rotate in opposite directions to achieve tandem drive.

The drive motor 41, the coupling 42, and the speed reducer 43 are arranged on the opposite side of the frame 20 with respect to the gear train of the pinion gear 44 and drive gears 15a and 15b in the axial direction Ax.

4 and 6, the pinion gear 44 and the drive gear 15b mesh, but depending on the rotation angle of the frame 20 (when the frame 20 is rotated 180 degrees from FIG. 6), the pinion gear 44 and the drive gear 15a mesh.

<Winding the conveyor belt around the drive pulley>
A procedure for winding the conveyor belt 5 around the pair of driving pulleys 10a and 10b will be described with reference to FIGS. 7(A) to 7(D). In FIG. 7, the drive pulley 10b is hatched for convenience.

As shown in FIG. 7(A), a pair of drive pulleys 10a and 10b are arranged at a winding start position with respect to the conveyor belt 5. As shown in FIG. The winding start position is a position where the conveyor belt 5 is arranged between the pair of driving pulleys 10a and 10b as viewed from the axial direction Ax. One of the driving pulleys 10 a and 10 b is arranged on the front side of the conveyor belt 5 , and the other of the driving pulleys 10 a and 10 b is arranged on the back side of the conveyor belt 5 . Since the rotation angle of the frame 20 is adjusted so that the pair of drive pulleys 10a and 10b are aligned in the direction perpendicular to the conveyor belt 5 (thickness direction of the conveyor belt 5), the pair of drive pulleys 10a and 10b at the winding start position is aligned. is arbitrary in the rotational direction.

After the pair of drive pulleys 10a and 10b are positioned at the winding start position, the pair of drive pulleys 10a and 10b are moved by rotating the frame 20 as shown in FIGS. , about the central axis 20a of the frame 20 (see FIG. 5). By turning, a pair of drive pulleys 10a, 10b respectively come into contact with the conveyor belt 5 and wrap the conveyor belt 5 around the outer surface.

As shown in FIG. 7(D), when the pair of drive pulleys 10a and 10b are positioned at the predetermined winding completion position, the rotation of the frame 20 is stopped. The winding completion position is a position where either one of the pair of drive gears 15a and 15b connected to the pair of drive pulleys 10a and 10b can mesh with the pinion gear 44 of the drive section 40. FIG. In FIG. 6, since the pinion gear 44 meshes with the pair of drive gears 15a and 15b at a position horizontally aligned, the winding completion position is a position where the pair of drive pulleys 10a and 10b are horizontally aligned.

Depending on the winding start position, the pair of drive pulleys 10a, 10b (frame 20) are rotated at an angle greater than 180 degrees and less than 360 degrees from the winding start position to the winding completion position. For example, the pair of driving pulleys 10a and 10b (frame 20) are rotated approximately 270 degrees from the winding start position to the winding completion position in FIG. 7(A).

<Rotation of frame>
Next, a procedure for rotating the frame 20 will be described with reference to FIGS. 8(A) to 8(C).

When rotating the frame 20 , the frame 20 is made rotatable with respect to the base 30 in advance. Specifically, the frame 20 and the fixing flange 24 are connected by attaching the inner row bolts 25a to the fixing flange 24, while the fixing flange 24 is not attached to the outer row bolts 25b. That is, the fixing flange 24 and the mount 30 are not connected.

Next, one end of the rigging 55 is attached to one of the connection portions 26 corresponding to the rotational direction of the frame 20 via the guide portion 34 of the frame 30 . In the example of FIG. 8A, one end of the rigging 55 is connected to one connecting portion 26a at the initial position. The other end of rigging 55 is connected to external drive hardware 50 for pivoting frame 20 . In the example of FIG. 8 , an external driving device 50 for rotating the frame 20 is installed near the pedestal 30 .

In the example of FIG. 8, the external drive hardware 50 is, for example, a lever block (registered trademark). The external driving device 50 may be a lever block, a chain block, an electric or manual winch, a hydraulic cylinder, or the like, and is not particularly limited. Although the rigging 55 is a wire rope for traction, it may be a chain or a fiber rope. The external drive device 50 may be a manual device or a device using a drive source such as electric power or hydraulic pressure, and is not particularly limited. When the external drive hardware 50 is a lever block, one side of the lever block is attached to the other end of the rigging 55 and the other side of the lever block is connected to a fixedly installed anchor 51 . The traction reaction force of the external driving equipment 50 is supported by the anchors 51 .

As shown in FIG. 8(B), when the cordage 55 is hoisted by the external driving equipment 50, the connecting portion 26a is pulled. As a result, the frame 20 rotates about the central axis 20a in the pulling direction (here, clockwise).

FIG. 8(C) shows a state in which the frame 20 has rotated approximately 90 degrees and the connection portion 26a has reached the vicinity of the lowest point. In this state, one end of the rigging 55 is removed from the connecting portion 26a and reconnected to the connecting portion 26d positioned at the initial position. The rigging 55 is then hoisted again by the external drive equipment 50 . The frame 20 is rotated to a desired angle by repeating the attachment of the rigging 55 to any of the connecting portions 26 and the winding up of the rigging 55 by the external driving equipment 50 . As shown in FIG. 7, the conveyor belt 5 can be wound around the driving pulleys 10a and 10b at a predetermined angle by rotating the frame 20 approximately 270 degrees from the winding start position to the winding completion position.

According to this procedure, since the external driving equipment 50 is used to pull the frame 20, it is easy to adjust the amount of rotational movement of the frame 20, and the accuracy is high. In addition, as indicated by the two-dot chain line in FIG. 8(C), when the rigging 55 is connected to the connecting portion 26b, the rotation in the reverse rotation direction can be easily performed. Therefore, compared with the conventional system in which the drive pulley is rotated by an electric motor for driving the belt conveyor, the adjustment accuracy of the amount of rotation is dramatically improved.

After the frame 20 is rotated until the pair of driving pulleys 10a and 10b are positioned at the winding completion position, the fixing flange 24 is mounted with the outer row bolt 25b to fix the fixing flange 24 and the frame 30. . Since the mount 30 and the frame 20 are bolted via the fixing flange 24, high rigidity is obtained.

(Effect of the intermediate driving device of the present embodiment)
The intermediate driving device 100 of this embodiment can obtain the following effects.

As described above, the intermediate drive device 100 of the present embodiment rotatably supports the pair of drive pulleys 10a and 10b around which the conveyor belt 5 is wound and the rotation shafts 11a and 11b of the pair of drive pulleys 10a and 10b. a frame 20 that supports a pair of drive pulleys 10a and 10b integrally with the frame 20 so as to be rotatable around a central axis 20a parallel to the rotation shafts 11a and 11b; and a pair of drive pulleys 10a and 10b. , and the frame 20 is configured to be driven and rotated by an external driving device 50 different from the driving unit 40 .

With the above configuration, the frame 20 that rotatably supports the rotation shafts 11a and 11b of the pair of drive pulleys 10a and 10b can be rotated while being supported by the base 30. FIG. Therefore, the rotation angle of the frame 20 is adjusted in advance so that the pair of driving pulleys 10a and 10b are arranged on the front side and the back side of the conveyor belt 5 in accordance with the direction in which the conveyor belt 5 extends. The conveyor belt 5 can be inserted between the drive pulleys 10a, 10b. After the conveyor belt 5 is inserted, the operation of winding the conveyor belt 5 around the pair of drive pulleys 10a and 10b can be simplified simply by rotating the frame 20 until the conveyor belt 5 is sufficiently wound around the respective drive pulleys 10. can do In addition, since the frame 20 is rotated by being driven by an external driving device 50 different from the driving unit 40 that rotationally drives the pair of driving pulleys 10a and 10b, the driving unit 40 requires highly accurate speed control and positioning control. not. As a result, high-precision speed control and positioning control are unnecessary, and the installation work of the intermediate driving device 100 can be facilitated.

Further, in the present embodiment, as described above, the frame 20 is arranged on one side of the pair of drive pulleys 10a and 10b in the axial direction Ax, and is configured to cantilever the respective rotating shafts 11a and 11b. The pair of drive pulleys 10a and 10b are configured such that the conveyor belt 5 can be inserted between the pair of drive pulleys 10a and 10b from the side opposite to the frame 20 along the axial direction Ax. With this arrangement, the rotation angle of the frame 20 (the pair of drive pulleys 10a and 10b) is adjusted in advance according to the direction in which the conveyor belt 5 extends, and the intermediate driving device 100 is moved along the axial direction Ax from the side of the conveyor belt 5. The conveyor belt 5 can be inserted between the pair of drive pulleys 10a and 10b simply by sliding it. Therefore, the operation of winding the conveyor belt 5 around the pair of driving pulleys 10a and 10b can be easily performed in a short time simply by performing the operation of rotating the frame 20 and the operation of sliding the intermediate driving device 100. .

Further, in the present embodiment, as described above, the frame 20 has the first frame portion 21 and the second frame portion 22 facing each other with a gap in the axial direction Ax, and the pair of rotation shafts 11a and 11b. , a first bearing 12a provided on the first frame portion 21 side, and a second bearing 12b provided on the second frame portion 22 side. As a result, even when the rotating shafts 11a and 11b of the driving pulleys 10 are cantilevered, the rotating shafts 11a and 11b can be supported at a plurality of locations along the axial direction Ax. As a result, even with the cantilever support structure, it is possible to easily secure rigidity for supporting the tension of the conveyor belt 5 during transport of the excavated muck.

Further, in the present embodiment, as described above, the frame 20 has a circular shape when viewed from the axial direction Ax, and the mount 30 is movable along the rotational direction along the outer peripheral portion of the circular frame 20. A supporting support plate 33 is included. As a result, the frame 20 supporting the pair of drive pulleys 10a and 10b can be easily supported so as to be rotatable by 360 degrees or more by means of the structure for supporting the outer peripheral portion of the frame 20. As shown in FIG.

In the present embodiment, as described above, the pair of drive pulleys 10a and 10b are arranged on both sides of the central axis 20a of the frame 20 at positions equidistant from the central axis 20a when viewed in the axial direction Ax. ing. As a result, the distance between the drive pulleys 10a and 10b is reduced compared to, for example, the case where one drive pulley 10a is arranged coaxially with the center axis 20a of the frame 20 and the other drive pulley 10b is arranged away from the center axis 20a. If they are the same, the distance (radius) from the central axis 20a of the frame 20 to each drive pulley 10a, 10b can be reduced. Therefore, the frame 20 that supports the pair of drive pulleys 10a and 10b can be made smaller.

Further, in the present embodiment, as described above, each of the pair of drive pulleys 10a and 10b has the drive gears 15 (15a and 15b) that mesh with each other, and the drive section 40 rotates according to the rotation angle of the frame 20. and has a pinion gear 44 that meshes with one of the drive gears 15 . As a result, by utilizing the fact that the distances from the center axis 20a of the frame 20 to the drive pulleys 10 are equal, the frame 20 can be simply rotated to a position where one of the drive gears 15 meshes with the pinion gear 44. The drive unit 40 and the drive gears 15a and 15b can be connected so as to be able to transmit power.

Further, in the present embodiment, as described above, the frame 20 has the connecting portion 26 connected to the external driving device 50, and is configured to be rotated by pulling the connecting portion 26 in the circumferential direction with the external driving device 50. It is As a result, the frame 20 can be rotated by the traction force acting on the connecting portion 26 . As a result, a simple traction mechanism can be used as the external driving device 50 instead of a large-scale device, so that restrictions on the space and equipment required for installation work of the intermediate driving device 100 can be effectively alleviated.

Further, in the present embodiment, as described above, the frame 20 has a plurality of connecting portions 26 (26a to 26d) along the outer circumference, and the mount 30 allows the direction of the rigging 55 from the external drive equipment 50 to be adjusted. It has a guide portion 34 that bends and guides the rigging 55 toward one of the plurality of connecting portions 26a-26d. As a result, the frame 20 can be rotated by connecting the external driving equipment 50 and one of the connecting portions 26 with the rigging 55 and pulling. At this time, since the direction of the traction force acting on the connection portion 26 is determined by the positional relationship between the guide portion 34 provided on the frame 30 and the connection portion 26, The frame 20 can be rotationally driven without restrictions on the distance to the pedestal 30 .

Further, in this embodiment, as described above, the frame 30 is configured to support the frame 20 so as to be rotatable at least 360 degrees. Thereby, the frame 20 can be freely rotated over one rotation (360 degrees) or more. Therefore, regardless of the direction in which the conveyor belt 5 extends, the operation of adjusting the rotational positions of the pair of drive pulleys 10a and 10b in accordance with the direction in which the conveyor belt 5 extends, The operation of rotating the frame 20 for winding the conveyor belt 5 inserted between them can be easily performed.

(Installation method of intermediate driving device)
Next, a method for installing the intermediate driving device 100 will be described with reference to FIGS. 9 to 21. FIG. The installation method of the intermediate driving device 100 of the present embodiment is a method of installing the intermediate driving device 100 for auxiliary driving the conveyor belt 5 in tunnel excavation work using the stretching belt conveyor 200 .

The installation method of the intermediate driving device 100 of the present embodiment includes at least the following steps.
(Step 1) During the operation of the stretching belt conveyor 200, the rotating shafts 11 of the pair of driving pulleys 10a and 10b are cantilevered from the side on the side of the conveyor belt 5 at the installation position of the intermediate driving device 100. A step of temporarily assembling an intermediate driving device 100 including a supporting frame 20, a base 30 rotatably supporting the frame 20, and a driving section 40 rotating a pair of driving pulleys 10a and 10b.
(Step 2) After the stretching belt conveyor 200 is stopped, the temporarily assembled intermediate driving device 100 is laterally moved from the side of the conveyor belt 5, thereby disposing the conveyor belt 5 between the pair of driving pulleys 10a and 10b. The process of making
(Step 3) A step of winding the conveyor belt 5 around the pair of driving pulleys 10a and 10b by rotating the frame 20 with the external driving device 50;

Below, a series of installation methods including installation of not only the intermediate driving device 100 but also the accessories attached to the intermediate driving device 100 will be described. 9 to 16 are diagrams for explaining the flow of the installation method in chronological order. 9 to 16, the directions of the X1 direction and the X2 direction are opposite to those in FIG.

As shown in FIG. 9, the intermediate driving device 100 is temporarily assembled during tunnel excavation (that is, during operation of the stretching belt conveyor 200) (step 1). First, while the stretching belt conveyor 200 is in operation, the installation table 60, the temporary heavy lifting machine 61, the overhang stand 62, and the like are assembled.

Next, the intermediate driving device 100 transported through the tunnel is lifted by the temporary lifting machine 61 and temporarily installed. FIG. 9 shows a state in which the intermediate driving device 100 is being lifted by the temporary heavy lifting machine 61 . In this step, all the attached devices other than the intermediate driving device 100 are also temporarily installed on the installation table 60 . The temporary heavy lifting machine 61 is removed after the installation work of the intermediate driving device 100 is completed.

During the temporary assembly process, the stretching belt conveyor 200 conveys the excavated waste EM from the face direction (X1 direction) toward the wellhead direction (X2 direction). FIG. 9 shows a conveyor intermediate portion MP of the stretching belt conveyor 200 near the planned installation position of the intermediate driving device 100 . The conveyor intermediate portion MP is supported on the tunnel wall by knee braces (not shown).

As shown in FIG. 17 , an overhang stand 62 is temporarily installed on the installation base 60 to overhang from the position of the conveyor belt 5 to a position shifted to the side of the conveyor belt 5 . The intermediate drive 100 and the accessories are preassembled on the outrigger 62 into a ready position P1 laterally displaced from the conveyor belt 5 . The overhang stand 62 is provided for temporarily installing equipment, and is removed from the installation stand 60 after the permanent installation of the intermediate driving device 100 and the like.

After the temporary assembly step, a step of stopping the stretching belt conveyor 200 is performed. As a result, the main drive 140 (see FIG. 1) is stopped, so the conveyor belt 5 is stopped.

In FIGS. 10 to 16, illustration of temporarily installed equipment is omitted except for equipment necessary for explanation. In the following description, the portion of the annular conveyor belt 5 that conveys the excavation waste EM toward the wellhead side (X2 direction) is called a carrier-side belt 5a, and after conveying the excavation waste EM, it returns toward the face 2 side (X1 direction). The portion where the belt is pulled is called a return side belt 5b.

As shown in FIG. 10, after the stretching belt conveyor 200 is stopped, a step of removing a portion of the stretching belt conveyor 200 (conveyor intermediate portion MP) present in the installation section of the intermediate driving device 100 is performed.

Next, a step of installing pulleys for guiding the conveyor belt 5 to the drive pulleys 10a and 10b of the intermediate drive device 100 is performed. Specifically, the belt handling jig 63 is installed, and the return vent pulley 64a is installed while the belt handling jig 63 retracts the return side belt 5b (broken line portion). Subsequently, the belt handling jig 63 is moved to the face side (X1 direction), and the return vent pulley 64b is installed while similarly retracting the return side belt 5b. When the belt handling jig 63 is removed from the return belt 5b, the return belt 5b is stretched between the return vent pulleys 64a and 64b.

Next, as shown in FIGS. 11 and 18, the intermediate head pulley 65 is installed while the carrier side belt 5a is retracted by the belt handling jig 63. As shown in FIG. When the belt handling jig 63 is removed from the carrier side belt 5a, the carrier side belt 5a is stretched over the intermediate head pulley 65. As shown in FIG.

Next, as shown in FIG. 12, the carrier side belt 5a on the wellhead side (X2 side) of the intermediate head pulley 65 is pulled in the face direction (X1 direction) by the belt handling jig 63, and the carrier vent pulley 66a is installed. . When the belt handling jig 63 is removed from the carrier side belt 5a, the carrier side belt 5a is stretched from the intermediate head pulley 65 to the carrier vent pulley 66a.

Next, the conveyor belt 5 is arranged between the pair of driving pulleys 10a and 10b of the temporarily assembled intermediate driving device 100 (step 2). Specifically, as shown in FIG. 19, an intermediate driving device 100 temporarily installed in advance is placed on the carrier side belt 5a between the intermediate head pulley 65 and the carrier vent pulley 66a from the side of the belt. slide to move. Before the intermediate drive device 100 is slid, the rotation angle of the frame 20 is adjusted in advance so that the drive pulleys 10a and 10b are positioned at the winding start position (see FIG. 7A). The intermediate drive 100 is translated in the direction indicated by the arrow 80 towards the conveyor belt 5 from a ready position P1 laterally adjacent to the conveyor belt 5 on the overhanging platform 62 . As a result of the movement, the intermediate drive 100 is arranged in the installation position P2 (see FIG. 20).

As a result, as shown in FIG. 13, the carrier-side belt 5a (conveyor belt 5) is inserted between the driving pulleys 10a and 10b (more precisely, the driving pulleys 10a and 10b are located on the upper surface side of the carrier-side belt 5a). , are inserted on the bottom side).

Next, as shown in FIG. 14, the conveyor belt 5 is wound around the pair of drive pulleys 10a and 10b (step 3). Specifically, the frame 20 of the intermediate driving device 100 is rotated to wind the carrier-side belt 5a (conveyor belt 5) around the drive pulleys 10a and 10b. The winding procedure of the conveyor belt 5 is as described above with reference to FIGS. 7(A) to 7(D). The driving pulleys 10a, 10b arranged at the winding completion position are meshed with the pinion gear 44 (see FIG. 6). This allows the intermediate drive device 100 to drive the conveyor belt 5 .

After that, as shown in FIG. 15, a step of installing the carrier vent pulley 66b on the portal side (X2 side) of the intermediate driving device 100 is performed. As a result, both the carrier-side belt 5a and the return-side belt 5b are in a normal state (a state in which the conveyor belt 5 can be circulated).

Subsequently, a step of installing accessories of the intermediate driving device 100 is performed. As shown in FIG. 16, the head chute 67, transfer hopper, transfer conveyor section 68, etc. are installed at the position of the intermediate head pulley 65. As shown in FIG. The head chute 67 is a cylindrical member that receives the excavated waste EM conveyed from the face side to the intermediate head pulley 65 and supplies the received excavated waste EM to the transfer hopper and the transfer conveyor section 68 . The transfer hopper and transfer conveyor section 68 are devices for dispersing the excavation muck EM and supplying it onto the carrier-side belt 5a on the wellhead side. The transfer conveyor section 68 is composed of impact rollers, conveyor rollers, rectifying plates, and the like. In addition, a monitoring device (not shown) such as a meandering detector is also installed. Between the intermediate head pulley 65 and the intermediate driving device 100, a belt cleaning device (not shown) such as a scraper or a water cleaner is installed. Finally, a step of installing the conveyor frame 69 on the face side (X1 direction side) is performed.

The intermediate driving device 100 and the attached equipment are installed on the stretching belt conveyor 200 by the above steps. When the process of installing the conveyor frame 69 on the face side is completed, the suspended stretching belt conveyor 200 is restarted. Therefore, tunnel excavation work will resume. After restarting the operation, the conveyor belt 5 is driven to circulate by the main driving device 140 and the intermediate driving device 100 .

The bearing structure of the intermediate head pulley 65 will be described with reference to FIG. Two bearings 71 are provided inside the pulley portion 70 along the axial direction Ax. The intermediate head pulley 65 is also equipped with external protective devices such as seals that protect the bearings 71 . The intermediate head pulley 65 is rotatably supported by a shaft 72 via these two bearings 71 . The shaft 72 is fixed to the installation base 60 . That is, the intermediate head pulley 65 is a free pulley in which the shaft 72 is fixed and the pulley portion 70 rotates with respect to the fixed shaft 72 via the bearing 71 .

With such a structure, the intermediate head pulley 65 is cantilevered on the installation base 60 . Other return vent pulleys 64a, 64b and carrier vent pulleys 66a, 66b are also cantilevered on the mounting table 60 with the same structure as the intermediate head pulley 65 shown in FIG. For this reason, these pulleys can be installed at predetermined support positions by simply arranging the pulleys so that the leading end sides of the pulleys are inserted into the conveyor belt 5 from the side in the same manner as the intermediate driving device 100 described above.

(Effect of installation method of intermediate driving device of this embodiment)
The installation method of the intermediate driving device 100 of the present embodiment can provide the following effects.

As described above, the installation method of the intermediate driving device 100 of the present embodiment includes the steps of temporarily assembling the intermediate driving device 100 while the stretching belt conveyor 200 is in operation, and temporarily assembling the intermediate driving device 100 after stopping the stretching belt conveyor 200. By laterally moving the intermediate driving device 100 from the side of the conveyor belt 5 to dispose the conveyor belt 5 between the pair of driving pulleys 10a and 10b, and by rotating the frame 20 by the external driving device 50 , winding the conveyor belt 5 around the pair of drive pulleys 10a, 10b.

With the above configuration, after temporary assembly of the intermediate driving device 100, the pair of driving pulleys 10a and 10b can be driven by simply sliding the intermediate driving device 100 along the rotating shaft 11 from the side of the conveyor belt 5. A conveyor belt 5 can be arranged between. Thereafter, by rotating the frame 20, the conveyor belt 5 can be wound around the pair of drive pulleys 10a and 10b. Since the frame 20 is driven and rotated by the external drive equipment 50, the drive unit 40 does not require highly accurate speed control and positioning control. As a result, high-precision speed control and positioning control are unnecessary, and the installation work of the intermediate driving device 100 can be facilitated.

Further, while the stretching belt conveyor 200 is in operation, temporary assembly of the intermediate driving device 100 and adjustment of the rotation angle of the frame 20 (the pair of driving pulleys 10a and 10b) in accordance with the extending direction of the conveyor belt 5 are carried out in advance. can be kept After the stretching belt conveyor 200 is stopped, the conveyor belt 5 can be wound around the pair of driving pulleys 10a and 10b only by performing the operation of sliding the intermediate driving device 100 and the operation of rotating the frame 20. can be done. Therefore, the stop period of the stretching belt conveyor 200 required for installing the intermediate driving device 100 can be effectively shortened. As a result, it is possible to contribute to the efficiency of tunnel construction.

Furthermore, in this embodiment, various pulleys such as the intermediate head pulley 65, return vent pulleys 64a and 64b, and carrier vent pulleys 66a and 66b are also provided with a cantilever support structure like the drive pulleys 10a and 10b. As a result, not only the intermediate driving device 100 but also various belt-guiding pulleys attached to the intermediate driving device 100 can be assembled to the stretching belt conveyor 200 by simply inserting them into the conveyor belt 5 from one side.

Thus, while the stretching belt conveyor 200 is in operation, the installation table 60 and the overhanging platform 62 are pre-assembled on the side of the stretching belt conveyor 200, and the intermediate driving device 100, the intermediate head pulley 65, the return vent pulley 64a, 64b, carrier vent pulleys 66a, 66b, etc. are temporarily assembled, and then the stretching belt conveyor 200 is stopped, and the temporarily assembled intermediate driving device 100 and the auxiliary equipment can be quickly assembled. As a result, it is possible to minimize the tunnel excavation stop period (operation stop period of the stretching belt conveyor 200) until the main assembly is completed.

[Modification]
The embodiments disclosed this time should be considered illustrative and not restrictive in all respects. The scope of the present invention is indicated by the scope of the claims rather than the description of the above-described embodiments, and includes all modifications (modifications) within the scope and meaning equivalent to the scope of the claims.

For example, in the above-described embodiment, an example in which the mount 30 including the ring-shaped support portion 31 and the base portion 32 is provided has been shown, but the present invention is not limited to this. For example, as shown in FIG. 22, the ring-shaped support portion 31 may not be provided on the frame 30 . FIG. 22 shows an example in which the mount 230 supports the lower portion of the circular frame 20 with the base portion 32 . In FIG. 22, the base 230 includes support rollers 233 that support the outer peripheral portion of the circular frame 20 so as to be movable along the rotational direction. The support roller 233 is configured to roll and support the outer peripheral portion of the frame 20 . The support roller 233 is an example of a "support member" in the claims.

Further, in the above-described embodiment, an example in which the annular fixing flange 24 is provided on the frame 20 is shown, but the present invention is not limited to this. In the example of FIG. 22, the frame 20 is not provided with the fixing flange 24 . Instead of providing the fixing flange 24 , a plurality of fixing brackets 235 are provided on the pedestal 230 . A bolt insertion hole (not shown) is provided in the fixing bracket 235, and the fixing bracket 235 is fixed to the base portion 32 with a joint bolt 236b. When the frame 20 is arranged at a predetermined rotation angle, the joint bolt 236a can be inserted into the bolt insertion hole of the fixing bracket 235 and fixed to the screw hole (not shown) of the frame 20. FIG. Thereby, the frame 20 is fixed to the base portion 32 via the fixing bracket 235 . In addition, in this modification, a connecting portion 26 is provided around the frame 20 . The frame 230 is provided with the guide portion 34 as in the embodiment, and the rotation of the frame 20 can be performed in the same manner as in the above embodiment.

Further, in the above-described embodiment, an example in which the frame 20 cantilevers the rotation shafts 11a and 11b of the pair of drive pulleys 10a and 10b is shown, but the present invention is not limited to this. In the intermediate driving device 100 of the present invention, a structure may be provided to support one end P side of the rotating shafts 11a and 11b opposite to the frame 20. FIG. In this case, when inserting the conveyor belt 5 between the pair of drive pulleys 10a and 10b, the structure for supporting one end P side of the rotary shafts 11a and 11b is removed from the intermediate drive device 100, and the pair of drive pulleys 10a and 10b is removed. A structure for supporting one end P side of the rotating shafts 11a and 11b after arranging the conveyor belt 5 therebetween may be attached to the intermediate driving device 100. FIG.

Further, in the above-described embodiment, the example in which the first bearing 12a provided on the first frame portion 21 side and the second bearing 12b provided on the second frame portion 22 side with respect to the rotating shaft 11 is provided. Although shown, the invention is not so limited. In the present invention, instead of providing the first frame portion 21 and the second frame portion 22, the frame may be a single flat plate structure. In this case, for example, the frame may be provided with a large-diameter bearing structure that rotatably supports the outer peripheral portion of the driving pulley 10 .

In the above embodiment, the pair of drive pulleys 10a and 10b are arranged on both sides of the central axis 20a of the frame 20 at positions equidistant from the central axis 20a, but the present invention is limited to this. can't In the present invention, for example, one of the pair of drive pulleys 10a and 10b may be arranged on the central axis 20a of the frame 20, and the other may be arranged at a predetermined distance from the central axis 20a.

Moreover, in the above-described embodiment, an example in which the drive gears 15a and 15b are provided at the other ends of the rotating shafts 11a and 11b, respectively, is shown, but the present invention is not limited to this. In the present invention, the driving gears 15a and 15b may be provided at positions (intermediate positions of the rotating shaft) between the respective driving pulleys 10a and 10b and the frame 20 in the axial direction Ax.

Moreover, although the pair of drive pulleys 10a and 10b meshes with the pinion gear 44 at the winding completion position in the above embodiment, the present invention is not limited to this. In the present invention, for example, by making the position of the pinion gear 44 (drive unit 40) changeable, the intermediate drive device 100 is configured so that either one of the pair of drive pulleys 10a and 10b can mesh with the pinion gear 44 at any rotational position. may be configured.

Further, in the above-described embodiment, an example in which the frame 20 is rotated by pulling the connection portion 26 in the circumferential direction by the external drive equipment 50 is shown, but the present invention is not limited to this. In the present invention, for example, a plurality of engagement pieces (protrusions) are provided along the outer peripheral portion of the frame 20, and the engagement pieces are pushed out in the circumferential direction by an external driving device 50 comprising a direct acting mechanism such as a hydraulic cylinder. The frame 20 may be rotated by . The frame 20 can be freely rotated by arranging the engaging pieces at a pitch of one stroke of the cylinder and changing the engaging piece to be pushed out for each stroke. In this case, since the rigging 55 is not used, the guide part 34 for guiding the rigging 55 does not have to be provided on the frame 30 .

5 Conveyor Belt 10 (10a, 10b) Drive Pulley 11 (11a, 11b) Rotating Shaft 12a First Bearing 12b Second Bearing 15 (15a, 15b) Drive Gear 20 Frame 20a Center Axis 21 First Frame Part 22 Second Frame Part 26 (26a to 26d) connecting portion 30, 230 pedestal 33 support plate (support member)
34 guide part 40 drive part 44 pinion gear 50 external drive equipment 55 rigging 100 intermediate drive device 200 stretching belt conveyor 233 support roller (support member)
Ax axial direction (direction along the axis of rotation)

Claims (10)

An intermediate driving device installed in the middle of a conveying path and for auxiliary driving a conveyor belt in a stretched belt conveyor for conveying excavated waste during tunnel excavation,
a pair of drive pulleys spaced apart and around which the conveyor belt is wound;
a frame rotatably supporting the rotation shaft of each of the pair of drive pulleys;
a pedestal that supports the frame integrally with the pair of drive pulleys and rotatably around a central axis parallel to the rotation axis;
a drive unit that rotationally drives the pair of drive pulleys,
An intermediate drive, wherein the frame is configured to be driven to rotate by external drive equipment different from the drive. the frame is disposed on one side of the pair of drive pulleys in a direction along the rotation axis and configured to cantilever each of the rotation axes;
2. The intermediate drive according to claim 1, wherein the pair of drive pulleys are configured so that the conveyor belt can be inserted between the pair of drive pulleys from the opposite side of the frame along the rotating shaft. Device. The frame is
a first frame portion and a second frame portion facing each other with a gap in the direction along the rotation axis;
3. The rotating shaft according to claim 2, comprising a first bearing provided on the first frame portion side and a second bearing provided on the second frame portion side for each of the pair of rotating shafts. intermediate drive. the frame has a circular shape when viewed in a direction along the rotation axis;
The intermediate driving device according to any one of claims 1 to 3, wherein the mount includes a support member that supports an outer peripheral portion of the circular frame so as to be movable along the rotational direction. 5. The pair of drive pulleys according to any one of claims 1 to 4, wherein the pair of drive pulleys are arranged on both sides of the central axis of the frame at positions equidistant from the central axis when viewed along the rotation axis. 2. An intermediate drive device according to claim 1. each of the pair of drive pulleys has a drive gear that meshes with each other;
6. The intermediate driving device according to claim 5, wherein said drive section has a pinion gear that meshes with one of said drive gears according to the rotation angle of said frame. 7. The frame according to any one of claims 1 to 6, wherein the frame has a connection portion with the external drive equipment, and is configured to rotate by pulling the connection portion in a circumferential direction with the external drive equipment. 10. An intermediate drive device according to claim 1. The frame has a plurality of connection portions along the outer circumference,
8. The intermediate drive of claim 7, wherein the cradle includes guides for bending rigging from the external drive hardware and guiding the rigging towards one of the plurality of connections. The intermediate drive device according to any one of claims 1 to 8, wherein the cradle is configured to support the frame so as to be rotatable at least 360 degrees. A method for installing an intermediate driving device for auxiliary driving a conveyor belt in tunnel excavation work using a stretched belt conveyor, comprising:
a frame for laterally supporting the rotation shaft of each of a pair of driving pulleys in a cantilever manner, and the frame, on the side of the conveyor belt at the installation position of the intermediate drive device during operation of the stretching belt conveyor; a step of temporarily assembling the intermediate driving device including a pedestal for rotatably supporting the driving unit and a driving unit for rotationally driving the pair of driving pulleys;
After stopping the stretching belt conveyor, disposing the conveyor belt between the pair of drive pulleys by laterally moving the temporarily assembled intermediate drive device from the side of the conveyor belt;
winding the conveyor belt around the pair of drive pulleys by rotating the frame with external drive hardware.

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