JP5173749B2 - Chimney lining material removal device - Google Patents

Description

  The present invention relates to a device for removing a lining material such as asbestos that is attached to the inner surface of an existing chimney, in particular, a chimney having a structure in which a device body on which a rotary cutter is mounted is held at a central position in the chimney by a holding device. The present invention relates to an inner lining material removing device.

As is well known, lining materials with fire resistance and heat insulation are applied inside the large-scale chimneys of reinforced concrete, but asbestos (asbestos) is often used as the lining material in chimneys constructed in the past. It was.
In recent years, asbestos harmfulness has become clear, it is necessary to remove asbestos from the inner surface of the chimney to replace it with a safe lining material or to dismantle an existing chimney. As a means for safely and efficiently carrying out the removal, for example, removal devices as shown in Patent Document 1 and Patent Document 2 have been developed and are in widespread use in the future.

FIG. 5 shows an outline of the removal apparatus disclosed in Patent Document 1. This is used by being suspended from the top of an existing chimney 1, and an apparatus main body 10 for removing the lining material 2 attached to the inner surface of the chimney 1, and the apparatus main body 10. The holding device 20 for holding at the center position in the chimney 1 is mainly used, and the whole is integrally assembled with the main frame 15.
The apparatus main body 10 is mounted with a rotary head 12 having a bit 11 for peeling and removing the lining material 2 on the peripheral edge, and a drive motor 13 for rotationally driving it. The holding device 20 includes an upper and lower two-stage arm group 21 for holding the device main body 10 at the center position in the chimney 1 and taking a reaction force of the rotational driving force of the drive motor.
The upper and lower arm groups 21 in the holding device 20 are each composed of three arms 22 that can be deployed radially, and each arm 22 is swingable with respect to the main frame 15 with a shaft 23 at the upper end. A wheel 24 that is pivotally supported and can roll up and down the inner surface of the chimney 1 is attached to the lower ends of the arms 22. Each arm 22 can be radially expanded radially outward by operation of a hydraulic cylinder 25 as an operation mechanism. When each arm 22 is deployed, each wheel 24 is pressed against the inner surface of the chimney 1. The entire device is naturally held at the chimney center position so that both axes coincide.
Specifically, the hydraulic cylinders 25 are arranged above the arm groups 21 of the respective stages, and when the rods of the hydraulic cylinders 25 are respectively extended to push down the upper ends of the arms 22 of the respective stages, the arms 22 are pivoted. 23, the lower end portion of the wheel 24 is rotated outward and the wheels 24 are pressed against the inner surface of the chimney, whereby the entire device is naturally held at the chimney center position and the reaction force of the driving force of the driving motor 13 is obtained. In this state, the entire apparatus can be moved up and down while being guided by the wheels 24.
Further, when each arm 22 is pulled inward, the rod of the hydraulic cylinder 25 is retracted and the upper end of each arm 22 is pulled upward, or a spring that biases each arm 22 inward is provided at each stage. It is provided and pulled back inward using its elastic force.

FIG. 6 shows an outline of the removal apparatus shown in Patent Document 2. Since this also basically functions in the same manner as the removing apparatus shown in FIG. 5, the same reference numerals are given to the components common to both.
This removing device also includes a device main body 10 and a holding device 20, and the holding device 20 has upper and lower two-stage arm groups 21. An opening / closing operation is performed by an operation mechanism 30 constituted by 26 and a single spring 27.
That is, the operating mechanism 30 in this removing apparatus is attached to the rod 28 by disposing the spring 27 (pull spring) below the lower arm group 21 and pulling down the rod 28 by the downward biasing force of the spring 27. The upper ends of the arms 22 are pushed down via the pushers 29 to deploy the arms 22 at the same time, and the rod 28 is resisted against the urging force of the spring 27 by one hydraulic cylinder 26 disposed on the upper arm group 21. Then, the arms 22 are configured to be simultaneously returned to the inside by being pulled upward.
JP-A-11-200160 JP 2001-32535 A

Comparing the above two types of removal devices, the former requires two hydraulic cylinders 25 as an operating mechanism for independently operating the upper and lower two-stage arm group 21, so that it is difficult to reduce the size and weight of the entire device. It is also disadvantageous in terms of cost.
On the other hand, the latter has a configuration in which the upper and lower two-stage arm group 21 is operated simultaneously by a single hydraulic cylinder 26 and a single spring 27, so that the entire apparatus can be reduced in size and weight and cost can be reduced compared to the former. The latter is advantageous in that respect.

However, there is a case where a slight level difference is generated on the inner surface of the existing chimney, and the former is more advantageous for the holding performance of the holding device 20 in such a case.
That is, when there is a step 3 on the inner surface of the chimney as shown in FIG. 7, there is a slight difference in the inner diameter dimension of the chimney 1 above and below the step 3 (in the example shown in FIG. 7, the step 3 Therefore, it is preferable that the arm group 21 at each stage can adjust the unfolded state of each arm 22 following such a change in the inner diameter dimension.
In that respect, since the arm group 21 at each stage is independently operated by the hydraulic cylinder 25 in the removal device disclosed in Patent Document 1, the arm 22 at each stage is provided as shown in FIG. It is possible to hold the entire apparatus stably by appropriately deploying it corresponding to the chimney inner diameter above and below the stepped portion 3, respectively.
On the other hand, since the removal device shown in Patent Document 2 is configured to operate the arm groups 21 at each stage by only one hydraulic cylinder 26 and a single spring 27, the upper and lower arm groups 21 are independent. Therefore, in the state where the stepped portion 3 is straddled as shown in FIG. 7 (b), one arm group 21 is lifted from the inner surface of the chimney and the entire device becomes unstable, and the entire device becomes a chimney. It is also assumed that it will incline.

As described above, the conventional removal device of this type has advantages and disadvantages with respect to the configuration of the holding device 20, and therefore, in order to further spread this type of removal device, an improvement in that point is required.
In view of the above circumstances, the present invention does not impair the size and weight of the entire apparatus, and does not increase the cost. An object of the present invention is to provide an effective and suitable chimney lining material removing device that can be pressed against and can always hold the device main body stably.

  The present invention is an apparatus for removing a lining material that is disposed in an existing chimney so as to be movable up and down and is attached to the inner surface of the chimney, and a rotary head having a bit at the peripheral edge portion is connected to the chimney by a drive motor. An apparatus main body that rotates along a cross-section and peels and removes the lining material by the bit, and a holding apparatus that holds the apparatus main body at a central position in a chimney and receives a reaction force of the driving force by the drive motor The holding device has upper and lower two-stage arm groups arranged at intervals in the vertical direction, and an operation mechanism for driving the arm groups of the respective stages, and the arm groups of the respective stages. Each of which has a plurality of arms that are pivotally supported at the upper end and radially deployable radially outward of the chimney and capable of returning to the inside, and the inner surface of the chimney is arranged vertically at the lower end of each arm. Roll Possible wheels are attached, and the operation mechanism is arranged between the upper and lower springs, and a spring for arranging each arm in the upper part of each arm group and deploying each arm radially outward, respectively. It is composed of a bi-directional cylinder for returning the arms to the inside, and the springs respectively bias the wheels attached to the lower ends of the arms by urging the upper ends of the arms of the respective stages downward via pushers. The two-way cylinder can be pressed against the inner surface of the chimney, and the upper and lower ends of the rod are engaged with the pusher by the upward movement of the rod, respectively, and the pusher is resisted against the downward biasing force by the spring. Each arm can be returned to the inside by being pressed and displaced upward.

In the removing device of the present invention, the operating mechanism for the upper and lower two-stage arm groups is constituted by one bi-directional cylinder and a spring for independently energizing each stage arm group. Although it is basically operated by a bi-directional cylinder, the arm group at each step can behave independently of the step portion in the step portion.
Therefore, according to the removal apparatus of the present invention, the entire arm can be stably held by the arm groups at each stage and is not inclined with respect to the chimney, and the arm groups at each stage are operated independently. The operation mechanism is the most compact by adopting a bi-directional cylinder as a hydraulic cylinder for operating each arm group and placing it between the upper and lower springs. Therefore, it is possible to sufficiently reduce the size and weight of the entire removal device and reduce the cost.

Hereinafter, an embodiment of a chimney lining material removing apparatus according to the present invention will be described with reference to FIGS. 1 to 4. The basic configuration and basic functions of the removing apparatus of the present embodiment are shown in FIGS. 5 and 6. Since it is the same as the conventional removal apparatus shown, elements common to those conventional removal apparatuses are denoted by the same reference numerals and description thereof is omitted.
The removal device of the present embodiment is mainly composed of the apparatus main body 10 and the holding device 20 as in the prior art, and the holding device 20 has upper and lower two-stage arm groups 21. The difference from the conventional one is the configuration of an operation mechanism for opening and closing the arm group 21 at each stage.

That is, the operation mechanism 40 in the removal device of the present embodiment is basically operated by operating the arm groups 21 at each stage by one hydraulic cylinder as in the conventional one shown in FIG. As the hydraulic cylinder, a bi-directional cylinder 41 in which the rod 42 is extended and retracted in both the upper and lower directions is adopted. The bi-directional cylinder 41 is disposed between the upper and lower arm groups 21 and is connected to the main frame 15 via the bracket 43. Are fixed.
The upper ends of the arms 22 are pivotally supported on the main frame 15 by the shafts 23, but pushers 44 for pushing the upper ends of the arms 22 downward are provided above the arm groups 21 of the respective stages. The springs 45 (pressing springs) are respectively arranged on the upper portions of the respective pushers 44, and each arm is provided via each pusher 44 by the downward biasing force of each spring 45 as shown in FIG. Each arm 22 is expanded outward by pushing down the upper end of 22.
As described above, the operation mechanism 40 in the present embodiment is mainly composed of one bi-directional cylinder 41 and two springs 45, and the bi-directional cylinder 41 described above has its rod 42 extended when the rod 42 is extended upward. The stoppers 46 attached to the upper and lower ends of 42 are engaged with the upper and lower pushers 44, respectively, and the pushers 44 can be pushed up against the downward biasing force of the spring 45, whereby FIG. As shown in FIG. 3, the arms 22 can be pulled back inward simultaneously.

When inserting the removing device of this embodiment into the chimney 1, as shown in FIG. 1, the bidirectional cylinder 41 is operated to extend the rod 42 upward, and the pushers 44 are pushed up to compress the springs 45, respectively. Then, each arm 22 is pulled back inward.
When the entire apparatus is inserted into the chimney 1 in this state, the hydraulic pressure in the bidirectional cylinder 41 is released. As a result, as shown in FIG. 2, the rod 42 is pushed down via the pusher 44 by the urging force of the spring 45, and at the same time, the upper end of each arm 22 is also pushed down by the pusher 44 so that the lower end of the arm 22 expands outward. Accordingly, each wheel 24 is pressed against the inner surface of the chimney 1 and the entire device is naturally held stably at the chimney center position without being inclined.

When the inner diameter of the chimney 1 is equal in each part, the unfolded state of each arm 22 is also naturally equal. However, for example, when there is a step in the chimney 1 as shown in FIG. As a result, the unfolded state of the arm group 21 at each stage naturally changes.
That is, the entire apparatus is lowered from the state shown in FIG. 2, and when the lower arm group 21 reaches the position of the stepped portion 3 as shown in FIG. 3, the lower end portion of each lower arm 22 is the stepped portion 3. , So that the upper end of each arm 22 is slightly displaced upward. At that time, although the pusher 44 is pressed against the stopper 46 by the urging force of the spring 45 downward, the upward displacement is not restrained, so the pusher 44 is pushed up by the upward displacement of the upper end of the arm 22. The inward rotation of the arm 22 is allowed as it is.
At this time, the upper arm group 21 maintains the state up to that point regardless of the operation of the lower arm group 21, so that both the upper and lower arm groups 21 sandwich the step portion 3 as shown in FIG. The entire apparatus can be stably held above and below, and thus the entire apparatus can pass through the position of the step portion 3 without being inclined.

  If the upper arm group 21 continues to descend and reaches the position of the stepped portion 3, the upper arms 22 follow the stepped portion 3 and rotate to the inside. Then, it passes through the step portion 3 as it is. Of course, as shown in FIG. 4, the stable state is maintained even after passing through the step portion 3.

As described above, the removal device of the present invention is basically configured such that the upper and lower two-stage arm groups 21 are operated by one hydraulic cylinder, but in the stepped portion 3, each stage arm group 21 behaves independently. Therefore, both arm groups 21 can always pass through the stepped portion 3 while being pressed against the inner surface of the chimney, and even in this case, the entire apparatus can always be held stably.
In particular, since the bi-directional cylinder 41 is used as one hydraulic cylinder and is disposed between the upper and lower springs 45, the whole of them can be arranged most compactly, and the entire apparatus can be sufficiently downsized.
Therefore, the removal device of the present invention does not cause the holding state to become unstable due to a part of the arms 22 floating in the stepped portion 3 unlike the conventional removal device shown in FIG. Since the conventional removal device does not use two hydraulic cylinders, the entire device is not reduced in size, weight, and cost. That is, the removing device of the present invention has both advantages of the conventional removing device, and is extremely effective as this kind of chimney lining material removing device.

Although one embodiment of the present invention has been described above, the above embodiment is merely a preferable example, and the specific configuration of the arm group and its operation mechanism as well as the apparatus main body and the holding device is described in the present invention. Needless to say, appropriate design changes can be made without departing from the scope of the invention.
In addition, although the said embodiment demonstrated the case where there existed a level | step-difference part which a lower part narrows in the middle of the chimney 1, conversely also when there exists a step part which a lower part expands as shown in FIG. Needless to say, the arm group 21 can follow and move stably.

It is a figure which shows schematic structure of the removal apparatus which is one Embodiment of this invention. It is a figure which shows the state (state in the upper position of a level | step difference part) of the holding | maintenance apparatus in a chimney similarly. It is a figure which shows the state (state in the position of a level | step-difference part) of the holding | maintenance apparatus in a chimney. It is a figure which shows the state (state in the downward position of a level | step-difference part) of the holding | maintenance apparatus in a chimney similarly. It is a figure which shows an example of the conventional removal apparatus. It is a figure which shows another example same as the above. It is a figure which shows the state of the holding | maintenance apparatus in the position of a level | step difference part similarly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chimney 2 Lining material 3 Level difference part 10 Apparatus main body 11 Bit 12 Rotating head 13 Drive motor 15 Main frame 20 Holding device 21 Arm group 22 Arm 23 Axis 24 Wheel 40 Operation mechanism 41 Bidirectional cylinder 42 Rod 43 Bracket 44 Pusher 45 Spring 46 Stopper

Claims (1)

An apparatus for removing a lining material disposed in an existing chimney so as to be movable up and down and attached to the inner surface of the chimney,
An apparatus main body that rotates a rotary head having a bit at a peripheral edge portion along a cross section of a chimney by a drive motor and peels and removes the lining material by the bit;
A holding device that holds the device main body at the center position in the chimney and receives a reaction force of the driving force by the drive motor;
The holding device has upper and lower two-stage arm groups arranged at intervals in the vertical direction, and an operation mechanism for driving the arm groups of the respective stages,
Each arm group of each stage has a plurality of arms whose upper ends are pivotally supported and whose lower ends are radially expandable radially outward of the chimney and can be returned to the inside, and the chimneys are disposed at the lower ends of the arms. Wheels that can roll up and down the inner surface of the
The operating mechanism is arranged at the upper part of each arm group of each stage and is arranged between the springs for deploying each arm radially outward and the upper and lower springs to return each arm to the inside. Consisting of a two-way cylinder
Each of the springs can press the wheels attached to the lower ends of the arms against the inner surface of the chimney by urging the upper ends of the arms of the respective stages downward via pushers,
The bi-directional cylinder causes the upper and lower ends of the rod to engage with the pusher by the upward movement of the rod, and the pusher is pressed and displaced upward against the downward biasing force of the spring. The lining material removing device in a chimney characterized in that each arm can be returned to the inside by the above.

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