JP2011069157A - Gate device for earth removal port of screw conveyer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gate device for an earth removal port of a screw conveyor, which enables an internal space in a shield machine to be secured by reducing the installation space. <P>SOLUTION: The gate device 23 opens/closes the earth removal port 21 of a screw conveyor 15 by advance or retreat of a gate plate 22. The gate plate 22 includes a pair of gate plates 22a, 22b which are divided at the center in the advancing and retreating direction, and configured so as to be opened and closed in a double swing manner. Power cylinders 24 openably/closably driving the gate plates 22a, 22b are disposed on both sides of the gate plates 22a, 22b in the direction orthogonal to the opening and closing directions of the gate plates, respectively. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a soil discharge gate device for a screw conveyor in a shield machine.

  As shown in FIG. 7, the shield machine includes a screw conveyor 15 as a soil removal device for carrying the excavated earth and sand backward (see, for example, Patent Document 1). The screw conveyor 15 includes a cylindrical casing 16 having a soil intake port 19 at a front end and a soil discharge port 21 at a rear end side, a screw 17 rotatably provided in the casing 16, and a casing 16 is provided with a drive unit 18 that rotationally drives the screw 17 and a gate device (also referred to as a discharge port gate device) 51 that opens and closes the discharge port 21 by moving the gate plate 50 forward and backward. Yes.

  The gate device 51 opens and closes the earth discharge port 21 by moving the gate plate 50 back and forth in the longitudinal direction of the screw conveyor 15 by a power cylinder 52.

JP 2006-233609 A

  However, since the gate device 51 employs a structure in which the gate plate 50 is opened only in one side (one direction), the power cylinder 52 at the time of extension is obtained by extending the rod part 52b from the cylinder part 52a of the power cylinder 52. There is a problem that a large installation space is required by adding the length of the gate plate 50 to the length of the gate. For this reason, the space inside the shield machine 1 is limited. For example, in the case of a screw conveyor of a small-diameter shield machine, a gate device having a structure in which the gate plate is opened only on one side may not be installed due to the space in the machine. It was.

  The present invention has been made in view of the above circumstances, and provides an earthing gate device for a screw conveyor that can reduce the installation space of a gate device and can secure the space inside a shield machine. Objective.

  In order to achieve the above object, the present invention provides a gate device that opens and closes a gate conveyor and opens and closes a discharge port of a screw conveyor, and the gate plate is divided at the center in the forward and backward direction so that it can be opened and closed in both directions. The power cylinder for opening and closing the gate plate is disposed on both sides in a direction orthogonal to the opening and closing direction of both gate plates.

  The power cylinder is a bidirectional power cylinder that advances and retracts the rod portion from both ends in the longitudinal direction of the cylinder portion.

  A slide guide for slidably guiding the outer end portion of the gate plate in the opening and closing direction; and a lock pin for fixing the gate plates to a fully closed position at the outer end portion of the slide guide and the gate plate; Is provided with a pin hole for fitting.

  A wire reel type stroke meter for detecting the opening / closing strokes of the gate plates, and an end portion of the wire drawn from the stroke meter is wound around a pulley provided at an outer end portion of one gate plate; It is fixed to the outer end of the other gate plate.

  ADVANTAGE OF THE INVENTION According to this invention, the installation space of a gate apparatus can be reduced and the in-machine space of a shield machine can be ensured.

It is a schematic longitudinal cross-sectional view of the shield machine which concerns on embodiment of this invention. It is a top view of the gate apparatus installed in the discharge port of a screw conveyor. It is a partial cross section side view of a gate apparatus. It is the sectional view on the AA line of FIG. It is a schematic longitudinal cross-sectional view of the shield machine which concerns on other embodiment of this invention. It is a schematic rear view of the shield machine. It is a figure which shows the soil discharge gate apparatus of the conventional screw conveyor.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is explained in full detail based on an accompanying drawing.

  As shown in FIG. 1, the shield machine 1 has a cylindrical shield frame 2 provided with a partition wall 3 for partitioning the front and rear, and a rotary cutter 4 for excavating a face mountain on the front surface of the shield frame 2. It is provided and configured. The cutter 4 is provided with a plurality of cutter spokes 4b radially on the center boss 4a. The cutter spoke 4b projects a ground bit by projecting radially outward from the inside of the cutter bit 4c and the cutter spoke 4b. An overcutter (not shown) is provided.

  A rotating ring 5 is rotatably provided on the partition wall 3, and the rotating ring 5 and the cutter spoke 4 b are connected via an intermediate beam 6. The rotary ring 5 is provided with a ring-shaped gear 7, and the partition wall 3 is provided with a drive unit (for example, an electric motor) 9 that rotates the cutter 4 by engaging a drive gear 8 with the gear 7. . The partition wall 3 includes, for example, an annular first partition wall 3a provided on the inner periphery of the shield frame 2 and a second partition wall 3b arranged on the inner periphery side of the first partition wall 3a. The partition 3b is a fixed partition as with the first partition 3a, but may be structured to rotate together with the rotating ring 5.

  Between the cutter 4 and the partition wall 3, an earth and sand taking-in chamber (chamber) 10 for taking in the earth and sand excavated by the cutter bit 4c and the over cutter is formed. A stirring blade for rotating the cutter spoke 4b integrally with the cutter spoke 4b to knead the earth and sand in the earth and sand taking-in chamber 10 or to suppress the adhesion of the earth and sand to the first partition 3a. 11 is protrudingly provided. The shield frame 2 in the illustrated example includes a front body portion 2a and a rear body portion 2b that are connected to each other via a middle folding jack 12, and a propulsion shield jack 13 is provided on the front body portion 2a. A segment assembling apparatus (not shown) is provided on the rear body portion 2b via a turning ring 14.

  A screw conveyor 15 is provided below the first partition wall 3a constituting the partition wall 3 for carrying out the earth and sand from the earth taking-in chamber 10 backward. The screw conveyor 15 includes a cylindrical casing 16, a screw 17 that is rotatably provided in the casing 16, and a drive unit (for example, an electric motor) 18 that rotationally drives the screw 17. The screw 17 includes a rotating shaft 17a and a spiral feed blade 17b provided on the rotating shaft 17a. The drive portion 18 is attached to the rear end portion of the casing 16, and the drive portion 18 rotates the rear end portion of the rotary shaft 17 a of the screw 17 via a reduction mechanism (not shown). The tip of the screw 17 is a free end, and the screw 17 is retracted along the casing 16 or pulled out from the casing 16 by releasing the fixation of the drive unit 18 with the casing 16 and moving it backward. Is possible.

  As for the screw conveyor 15, the front-end part is connected to the lower side of the said 1st partition 3a, and the rear-end side is extended toward diagonally upward. The front end portion of the casing 16 has an earth and sand intake port 19 that is cut obliquely in order to connect to the first partition 3a. The first partition 3a is provided with an opening 20 that communicates the earth and sand intake port 19 of the casing 16 and the earth and sand intake chamber 10 of the shield machine 1, and the tip of the screw 17 takes in the earth and sand from this opening 20. It protrudes into the chamber 10.

  The first partition 3a is provided with an inlet gate (not shown) that can close the opening 20 when the distal end side of the screw 17 is retracted from the opening 20 for maintenance. In addition, a discharge port 21 is provided at a lower portion on the rear end side of the casing 16, and a gate device 23 that opens and closes the discharge port 21 by moving the gate plate 22 forward and backward is provided.

  In particular, the gate plate 22 includes a pair of gate plates 22a and 22b which are divided at the center in the advancing and retreating direction and can be opened and closed in both directions as shown in FIGS. A pair of left and right power cylinders 24 for opening and closing the gate plates 22a and 22b are disposed on both sides in a direction orthogonal to the opening and closing direction of the gates 22b.

  The power cylinder 24 is preferably a bi-directional power cylinder that advances and retracts the rod portions 24b and 24b from both ends in the longitudinal direction of the cylinder portion 24a, for example, in order to simplify the structure. The power cylinder 24 is preferably a hydraulic cylinder. In this case, connection ports 25a, 25b, and 25c for connecting hydraulic pipes (not shown) are provided at the center and both ends on the side surface of the cylinder portion 24a of the power cylinder 24, and hydraulic pressure is supplied from the center connection port 25a. The rods 24b and 24b are extended by introducing and discharging the hydraulic pressure from the connection ports 25b and 25c at both ends, the hydraulic pressure is introduced from the connection ports 25b and 25c at both ends, and the hydraulic pressure from the central connection port 25a. The rod portions 24b and 24b can be contracted by discharging the.

  The gate device 23 has a cylindrical earth discharge cylinder portion 26 having flange portions 26fa and 26fb at both upper and lower ends, and a pair of left and right gate plates 22a, A slit 27 is provided through 22b so as to be able to advance and retract in the horizontal direction. In this case, in order to form the slit 27 through which the gate plates 22a and 22b having a width substantially equal to the diameter of the soil discharge tube portion 26 can be formed, the soil discharge tube portion 26 is an intermediate portion in the vertical direction and the upper tube portion 26a and the lower tube. It is preferable that slit forming members 27a and 27b that are divided into upper and lower parts are interposed between the upper cylinder part 26a and the lower cylinder part 26b. The upper slit forming member 27a is fixed to the upper cylindrical portion 26a, and the lower slit forming member 27b is fixed to the lower cylindrical portion 26b. By fastening these upper and lower slit forming members 27a and 27b with bolts and nuts, The earth removal cylinder part 26 which consists of the upper cylinder part 26a and the lower cylinder part 26b is assembled.

  A pair of upper and lower support portions 28a and 28b for supporting the intermediate portion in the longitudinal direction of the power cylinder 24 are provided on both side portions of the upper cylinder portion 26a and the lower cylinder portion 26b, respectively. Support shafts 29a and 29b project from the upper and lower portions of the intermediate portion in the longitudinal direction of the power cylinder 24, and these support shafts 29a and 29b are supported by the support portions 28a and 28b.

  A packing 30 and a packing presser 31 are provided at both ends in the longitudinal direction of the slit forming members 27a and 27b to seal between the gate plates 22a and 22b extended from the slit 27 and the slit forming members 27a and 27b. It has been. These packing 30 and packing presser 31 are preferably provided in a plurality of stages in order to improve the sealing performance.

  The front end portions (butting portions) which are the inner end portions of the gate plates 22a and 22b are formed in a shape having an inclined portion 32 which is inclined so as to expand downward in order to suppress biting of earth and sand. Preferably it is. On both sides of the outer ends of the gate plates 22a and 22b, connecting portions 34 for connecting the rod portions 24b of the power cylinder 24 via connecting pins 33 are provided.

  At the front and rear portions of the lower cylinder portion 26b in the earth removal cylinder portion 26, a slide guide 35 having an inverted U-shaped cross section for projecting the outer end portions of the gate plates 22a and 22b so as to be slidable in the opening and closing direction protrudes. A slider 35a that slides along the slide guide 35 is provided at the outer end of each gate plate 22a, 22b. The slide guide 35 and the outer ends of the gate plates 22a and 22b are provided with pin holes 37 into which lock pins 36 for fixing the gate plates 22a and 22b in the fully closed position are fitted from below. . The pin hole 37 is provided with an engagement member (not shown) that detachably engages with an annular groove 36a formed at the tip of the lock pin 36 to prevent the lock pin 36 from falling off. It is preferable. Further, the lock pin 36 is preferably connected to the lower flange portion 26fb of the gate device 23 through a hanging strap 36b in order to prevent the lock pin 36 from being lost.

  A wire reel type stroke meter 38 for detecting the opening / closing strokes of the gate plates 22a, 22b is provided on one side of the earth discharging cylinder portion 26. The stroke meter 38 includes a reel 38b for winding the wire 38a therein, and a detection unit (not shown) that detects the amount of winding of the wire 38a, that is, the amount of movement (opening) of the gate plates 22a and 22b by the rotation of the reel 38b. Have. The end portion of the wire 38a drawn from the stroke meter 38 is wound around a pulley 39 provided at the outer end portion of one gate plate 22b and is fixed to the outer end portion of the other gate plate 22a. That is, the end of the wire 38a drawn from the stroke meter 38 is fixed to the outer end of the other gate plate 22a via the stopper 40, and the wire 38a between the end of the wire 38a and the stroke meter 38 is fixed. An intermediate portion of the gate plate 22b is wound around a pulley 39 provided at the outer end portion of one gate plate 22b, so that one stroke meter 38 detects the opening / closing stroke (opening) of the pair of gate plates 22a and 22b. It can be done.

  In the figure, reference numeral 41 denotes a suspension portion for suspending the gate device 23 by a hoisting device or the like when the gate device 23 is removed from the soil discharge port 21 of the screw conveyor 15 for maintenance or the like. In the figure, reference numeral 42 denotes a cover provided to protect the movable part including the outer ends of the gate plates 22a and 22b.

  The operation of the present embodiment having the above configuration will be described. In order to open the gate plates 22a and 22b from the state in which both the gate plates 22a and 22b are closed, the rod portions 24b of both the power cylinders 24 and 24 may be extended. As a result, both gate plates 22a and 22b are fully opened, so that the earth and sand can be discharged from the discharge port 21 of the screw conveyor 15. On the contrary, when the rods 24b of both the power cylinders 24, 24 are contracted, the rod portions 24b reach the stroke end on the closed side, whereby both the gate plates 22a, 22b are fully closed, thereby the screw conveyor 15 The discharge of earth and sand from the earth discharge port 21 can be stopped. Moreover, the amount of earth and sand discharged can be easily adjusted by adjusting the opening between the gate plates 22a and 22b.

  In this case, after the wire 38a drawn out from the stroke meter 38 is wound around the pulley 39 at the outer end portion of one gate plate 22b, the end portion of the wire 38a is fixed to the outer end portion of the other gate plate 22a. Therefore, when both gate plates 22a and 22b are opened, the wire 38a is fed out from the reel 38b in the stroke meter 38, and when both gate plates 22a and 22b are closed, the reel 38b in the stroke meter 38 is moved to the reel 38b. The wire 38a is wound up.

  According to the present embodiment, the gate plate 22 is composed of a pair of gate plates 22a and 22b that are divided at the center in the advancing and retreating direction and can be opened and closed in both directions, and are orthogonal to the opening and closing direction of both gate plates 22a and 22b. Since the power cylinders 24 for opening and closing the gate plates 22a and 22b are arranged on both sides in the direction, the installation space for the gate device 23 can be reduced, and the space inside the shield machine 1 can be secured. By making the gate plates 22a and 22b split in the middle and sliding open and close in both directions, the opening and closing stroke of the gate plates 22a and 22b can be halved compared to a conventional single slide plate. By disposing power cylinders 24, 24 for opening and closing the gate plates 22a, 22b on both sides in a direction orthogonal to the opening / closing direction of the gate plates 22a, 22b, the power cylinders are arranged on the opening movement side of the gate plates 22a, 22b. The installation space for the power cylinder 24 should be sufficiently reduced as compared with the case of arrangement (in this case, it is necessary to secure not only the space for the cylinder portion of the power cylinder but also the space for the moving stroke of the rod portion). Can do.

  In addition, since the power cylinder 24 is a bidirectional power cylinder that advances and retracts the rod portions 24a and 24a from both ends in the longitudinal direction, the number of power cylinders 24 used can be reduced, and the structure can be simplified and the cost can be reduced. I can plan.

  A slide guide 35 for slidably guiding the outer ends of the gate plates 22a and 22b in the opening / closing direction is provided, and both gate plates 22a and 22b are provided at the outer ends of the slide guide 35 and the gate plates 22a and 22b. Is provided with a pin hole 37 for fitting a lock pin 36 for fixing the shield plate in the fully closed position. Therefore, when the gate plates 22a and 22b of the gate device 23 are closed and the excavation work of the shield machine 1 is stopped, It is possible to prevent the gate plates 22a and 22b from being opened arbitrarily by returning the oil to the power cylinder 24 side.

  A wire reel type stroke meter 38 for detecting the open / close stroke of both the gate plates 22a and 22b is provided, and the end of the wire 38a drawn from the stroke meter 38 is provided at the outer end of one gate plate 22b. Since it is wound around the pulley 39 and is fixed to the outer end of the other gate plate 22a, one opening / closing stroke (that is, whether it is in the fully closed position or the fully open position) of both gate plates 22a, 22b Therefore, the cost can be reduced.

  FIG. 5 is a schematic longitudinal sectional view of a shield machine according to another embodiment of the present invention, and FIG. 6 is a schematic rear view of the shield machine. The same parts as those in the embodiment of FIG. The shield machine 1 of the embodiment of FIG. 5 is a so-called mud pressure shield, and the shield frame 2 has a smaller diameter and the screw conveyor 15 is shorter than the shield machine of FIG. The cutter 4 has a center shaft 43 rotatably provided on the partition wall 3 in the shield frame 2 via a bearing 42, and the drive gear 8 of the drive unit 9 meshes with the gear 7 attached to the center shaft 43. Has been.

  The screw conveyor 15 has a discharge port 21 for discharging soil in the axial direction from the rear end of the casing 16, and a gate device 23 is attached to the discharge port 21. The screw conveyor 15 is a ribbon type, and the screw 17 is composed only of a feed blade 17b having no rotating shaft.

  The structure of the gate device 23 is the same as that in the above embodiment. A soil discharge pipe 44 is connected to the outlet side flange portion 26 fb of the gate device 23, and the mud is conveyed rearward through the soil discharge pipe 44. In FIG. 6, the earthpipe 44 is not shown. Also according to this embodiment, the same effect as that of the above embodiment can be obtained.

  The embodiments of the present invention have been described in detail with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the gist of the present invention. . In the above embodiment, the gate device is mounted so that the gate plate opening / closing direction is the longitudinal direction of the screw conveyor, but the gate plate opening / closing direction is orthogonal to or intersects the screw conveyor longitudinal direction. It may be done. In addition, in a screw conveyor having a discharge port at the rear end of the casing, the gate device of the present invention can be applied to the discharge port at the rear end of the casing.

  The power cylinder is not limited to a bidirectional power cylinder, and may be a combination of two power cylinders at the rear ends. The power cylinder is not limited to a hydraulic cylinder, and may be an electric cylinder.

15 Screw Conveyor 21 Earth Removal Port 22 Gate Plate 23 Gate Device 24 Power Cylinder 24a Cylinder Portion 24b Rod Portion 35 Slide Guide 36 Lock Pin 37 Pin Hole 38 Stroke Meter 38a Wire 39 Pulley

Claims (4)

  In the gate device that opens and closes the discharge port of the screw conveyor by moving the gate plate forward and backward, the gate plate is divided at the center in the forward and backward direction and consists of a pair of gate plates that can be opened and closed in both directions. A discharge conveyor gate device for a screw conveyor, wherein power cylinders for opening and closing the gate plate are disposed on both sides in a direction orthogonal to the opening and closing direction.   2. The discharge port gate device for a screw conveyor according to claim 1, wherein the power cylinder is a bidirectional power cylinder for moving the rod portion forward and backward from both longitudinal ends of the cylinder portion.   A slide guide for slidably guiding the outer end portion of the gate plate in the opening and closing direction; and a lock pin for fixing the gate plates to a fully closed position at the outer end portion of the slide guide and the gate plate; 2. A screw conveyor discharge gate apparatus according to claim 1, wherein a pin hole is provided for fitting the screw.   A wire reel type stroke meter for detecting the opening / closing stroke of both gate plates is provided, and an end portion of the wire drawn out from the stroke meter is wound around a pulley provided at an outer end portion of one gate plate. 2. The discharge port gate device for a screw conveyor according to claim 1, wherein the gate port device is fixed to an outer end portion of the other gate plate.

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