JPH07186016A - Polishing device for inner surface of underground buried pipe - Google Patents

Abstract

PURPOSE:To polish an inner surface of a pipe to desired sizes easily by supporting plural cylindrical grinding wheels on a holding frame in such a condition that they can be got closer to/apart from an axial center of a main body, and rotating the grinding wheels, while revolving it by rotation of the holding frame. CONSTITUTION:Plural cylindrical grinding wheels 9 are supported in parallel to each other in a polishing device main body 1 to be freely displaced in a radial direction by a slide mechanism including a slider 13, and a holding frame 8 is provided to be rotatable to the main body 1. Each grinding wheel 9 is rotated by a directly coupled motor 10 through a flexible shaft 11. Close to a circumferential surface of the grinding wheel 9, a pipe inner diameter measuring sensor 26 to measure a pipe inner radius at the front in its revolution direction is provided, and a reversible motor 23 is drive-controlled by a signal from the sensor 26 in the case where a set radius is not reached to displace the slide mechanism in the radial direction through threading engagement of a feed screw 17 with engagement members 19, 20, thereby an effective diameter of grinding is changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for polishing the inner surface of a conduit buried in the ground, and more specifically, finishing after filling and repairing a joint portion of a conduit, polishing before lining repair of a damaged portion, collapse, etc. The present invention relates to a polishing device suitable for finish polishing after filling and repairing the damaged part of the.

[0002]

2. Description of the Related Art As a device for polishing cylindrically so that there is no protruding portion on the inner surfaces of gas pipes and other water pipes and water pipes through which underground lines such as power lines and telephone lines are inserted, Although a device has been proposed, for example, in a pipe line that penetrates an underground line such as a power line or a telephone line, the manhole spacing is 2
It is as long as 00m, and the inner diameter of the pipeline is 100mm to 30
Due to the relatively small diameter of about 0 mm, it is difficult to polish the inner surface in a buried state. As an inner surface polishing apparatus for a long and small diameter conduit, for example, JP-A-2-275195,
There are JP-A-2-284855 and JP-A-4-2458.

[0003]

The prior arts described in the above publications all have a structure in which the finished size of the inner surface of the conduit is not taken into consideration, and moreover, the grinding stone or the grinding tool is moved by pulling while polishing. Therefore, not only is there a drawback that the finish is markedly "uneven" due to changes in the polishing allowance and changes in the moving speed, but also when polishing is performed more than necessary to form a recessed portion on the inner surface of the pipe.

Therefore, an object of the present invention is to bury the product in the ground.
An object of the present invention is to provide a polishing device capable of accurately and efficiently polishing the inner surface of a small-diameter conduit of about 100 to 300 mm.

[0005]

In order to achieve the above object, the present invention provides a polishing apparatus main body in which a plurality of cylindrical grinding wheels can be brought into contact with and separated from the shaft center of the main body by a slide mechanism while being parallel to each other. The bearing is supported by the holding frame, and the holding frame can be rotated with respect to the main body so that the grinding wheel can be rotated by a motor directly connected to it and revolved by another motor. In particular, a pipe inner diameter measuring sensor that can measure the inner radius of the pipe near the circumference of the grinding wheel and in front of the revolution direction is provided, and when the set radius is insufficient, the grinding wheel and slide mechanism are operated by the signal from this sensor. The main feature is that it is made possible.

[0006]

[Operation] When the main body is pulled into the pipeline while each grinding wheel is retracted inward, the main body is aligned with the axis of the pipeline in the part requiring polishing under the guidance of the guide. It is placed on the axis and kept stable. When the main body is placed in the pipeline, the operation of the polishing machine is started by the operation inside the work vehicle, etc. placed on the street, and when the pipe inner diameter measurement sensor outputs a signal that requires polishing. At the same time as the grinding wheel before and after the sensor is driven by the motor, the holding frame rotates and the grinding wheel revolves at a relatively low speed. In addition, the measurement result of the pipe inner diameter measurement sensor is monitored inside the work vehicle, etc., and under manual operation, the motor advances the grinding wheel in the radial direction via the slide mechanism through the slide mechanism, and polishing is performed until the desired size is reached. .

[0007]

The present invention will be described in detail below with reference to the illustrated embodiments. The polishing apparatus of the present invention is, for example, generally as shown in FIG. 1, a hollow shaft for inserting a cord at the center of a cylindrical main body 1 having a diameter smaller than the inner diameter of a conduit P through which an underground wire such as a power line or a telephone line is inserted. 2 is provided, and leaf spring guides 3 are extended on both outer circumferences, eyebolts 4 and 5 for binding the wires W and w are provided near the centers of both ends, and the body 1 has a substantially circular shape. A holding frame 8 in which the holding plates 6 and 6 are joined by bolts 7 and 7 is rotatably provided around the hollow shaft 2, and a plurality of diamond cutting blades are planted on the outer peripheral surface of the holding frame 8. The individual cylindrical grinding wheels 9 and 9 are directly connected by a flexible shaft 11 (a universal joint may be provided) so that they can be driven by different motors 10 and 10, respectively. The outer peripheral surface projects outward from the outer peripheral surface of the main body 1. Provided As can be rotated while.

As shown in FIGS. 1 to 3, the holding frame 8 is provided with guide grooves 12, 12 in the radial direction, and an arcuate slider 13 is supported at both end portions so that the slider 13 can be slid in the radial direction. In addition, the slider 13 is formed with dovetail groove-shaped engaging grooves 14, 14 inclined toward both ends thereof, while the left and right external threads 15, 14 are formed on one side of the outer periphery of the hollow shaft 2 in opposite directions. A hollow feed screw 17 in which 16 is engraved is loosely fitted, and the feed screw 17 has dovetail-shaped engaging projections 18 corresponding to the engaging grooves 14 in the slider 13 at the male threads 15 and 16 thereof. When the pair of engaging members 19 and 20 are screwed into each other under the opposed state and the feed screw 17 is rotated, the engaging members 19 and 2
The slider 13 is slid in the radial direction by the guide grooves 12 and 12 under the sliding movement of the engagement groove 14 and the engagement ridge 18 while keeping the distances 0 between each other. Configure a slide mechanism that can change the effective grinding diameter by the revolution of the.

The feed screw 17 can be rotated by a reversible motor 21 attached to the holding frame 8 under the interposition of a reduction mechanism 22, and a motor 23 is provided on the main body 1 to reduce the speed. The passive hollow shaft 25 of the holding frame 8 is rotated at a relatively low speed via 24, and the grinding wheels 9 and 9 are thereby revolved.

The rotational driving of the grinding wheels 9 and 9 is appropriately controlled by the measurement result by the pipe inner diameter measuring sensor 26. As the pipe inner diameter measuring sensor 26, for example, a roller type touch piece 27 is provided at the tip. The members 28 are provided radially at four positions under the condition of being supported by the supporting member 29 so as to be able to advance and retreat in the radial direction in the intermediate portion of the grinding wheels 9, 9, and each measuring member 28 is separately provided. The spring 30 urges the contact piece 27 to constantly contact the inner surface of the conduit P, and the measuring member 28 has the detected piece 3 attached thereto.
1, a proximity sensor 32 (or a proximity switch may be provided) is provided so as to correspond to this, and when the set radius is insufficient, the grinding wheel 9, based on the signal from the proximity sensor 32,
9 is driven by motors 10 and 10. The supporting member 29 and the proximity sensor 32 are preferably attached to the bolt 7 of the holding frame 8.

In order to prevent the contact piece 27 from coming into contact with the inner surface of the conduit P when the main body 1 is moved in the conduit P, the measuring member 28 is temporarily resisted against the spring 30. It is preferable to attach a retracting means that can be retracted, for example, a solenoid type actuator (not shown).

Regarding the driving of the grinding wheel 9 by the proximity sensor 32, it is desirable to drive the grinding wheels 9, 9 on both front and rear sides of the proximity sensor 32. Transformer type, eddy current type,
Various types such as a capacitance type and a magnetic type can be adopted, but a magnetic type using a Hall IC is suitable.

Grinding wheels 9 and 9 driven by the motor 21
In the radial direction, that is, the expansion / contraction adjustment, the measurement result by the pipe inner diameter measuring sensor 26 may be manually adjusted while visually recognizing the display of the sensor in the manhole or in the work vehicle arranged on the road.

In the embodiment shown in FIGS. 4 and 5, the grinding wheels 9 and 9 are used.
Of the engaging members 19 and 1 with respect to the slider 13.
9, 20 and 20 are separately provided so that the dovetail-shaped engaging projections 18 engage with the dovetail-shaped engaging grooves 14 and the holding frame 8
Is provided with a feed screw 17 on which left and right male screws 15 and 16 are engraved, and the feed screw 17 is rotated while being screwed into the engaging members 19 and 20 in a penetrating state. The slider 13 can be individually slid in the radial direction by the guide of the guide groove 12 based on the sliding movement of the engaging groove 14 and the engaging ridge 18 while bringing the mating members 19 and 20 into contact with each other. In this way, a slide mechanism capable of individually changing the advancing / retreating degrees of the grinding wheels 9 and 9 is constituted,
In addition, the feed screws 17 can be rotated by the respective motors 21 and 21 attached to the holding frame 8 under the interposition of the speed reduction mechanisms 22 and 22, and
The drive of the motors 21 and 21 may be adjusted manually while visually observing the proximity sensors 32 and 32. Note that, since the other configurations are not different in nature from the embodiment shown in FIGS. 1 to 3, the same reference numerals are given to the same portions and the description thereof will be omitted.

The rotation directions of the grinding wheels 9 and 9 are selected so that the adjacent grinding wheels 9 have opposite rotation directions as shown in FIG. The reaction force is canceled as much as possible to reduce the influence on the main body 1.

When the inner surface of the pipe P is ground by using the polishing apparatus having the above-described structure, first, the grinding wheels 9 and 9 are retracted inward, and the contact piece 27 is moved together with the measuring member 28 by the retracting means. Under the state of temporarily retracting against the spring 30, the pulling wire W and the pulling back wire w are bound to the eyebolts 4 and 5 at both ends of the main body 1, and the pulling wire W is inserted into the conduit P. After that, the main body 1 is pulled by the pulling wire W under the guidance of the leaf spring guides 3 and 3 and is arranged in the portion of the pipeline P where polishing is required. By searching in advance and confirming whether the arrangement of the main body 1 is proper or not, and when the arrangement of the main body 1 is completed, the main body 1 is stabilized at the position under the common axis of the pipe line P by the tensioning action of the guides 3, 3. Be kept .

When the main body 1 is arranged in the conduit P, the measuring member 28 which has been temporarily retracted by the retracting means is opened in the work vehicle arranged on the road, and the touching piece 2 thereof is opened.
After bringing 7 into contact with the inner surface of the pipe P, the operation of the polishing apparatus is started, and when the proximity sensors 32, 32 output a signal that requires polishing, grinding before and after the proximity sensor 32 is performed. At the same time when the wheels 9, 9 are rotated by the motors 10, 10, the motor 23 is started to rotate the holding frame 8 at a relatively low speed via the speed reducer 24 and the passive hollow shaft 25. So that the grinding wheels 9 and 9 revolve,
Further, while visually observing the measurement result by the pipe inner diameter measuring sensor 26 in the work vehicle, the feed screw 17 is rotated by the motor 21 under the manual operation, and the engaging members 19 and 20 are brought closer to each other to guide the slider 13 into the guide groove. The guides 12 and 12 are advanced in the radial direction, whereby the effective grinding diameter by the revolution of the grinding wheels 9 and 9 is increased and the operation is continued until the desired size is reached.

When the polishing is performed to a predetermined size, all the proximity sensors 32, 32 output signals indicating completion of polishing, so that power supply to the motors 10, 10 is stopped and the grinding wheels 9, 9 are rotated. At the same time, the completion of polishing can be confirmed by the display of the pipe inner diameter measuring sensor 26 in the work vehicle. At the same time, the power supply to the motor 21 is controlled by the manual operation to rotate the feed screw 17 in the reverse direction to move the grinding wheels 9 and 9 inward. The state of polishing is confirmed by the small TV camera.

As the pipe inner diameter measuring sensor 26, a sensor which directly detects the inner surface of the pipe P without contact by using a proximity sensor or a proximity switch without using the touch piece 27 is adopted. The grinding wheels 9 and 9 based on the detection result.
It may be possible to control the drive of the drive mechanism and the drive of the slide mechanism.

[0020]

As described above, according to the present invention,
It has the following effects. a While supporting a plurality of cylindrical grinding wheels 9 and 9 in parallel with each other in a state in which they can be brought into contact with and separated from the shaft center of the main body 1 by a slide mechanism, the holding frame 8 is attached to the main body 1 While allowing the grinding wheels 9 and 9 to rotate by the directly connected motors 10 and 10,
Since the holding frame 8 can be revolved by the rotation of the holding motor 8 by another motor 23, a wide area can be polished uniformly and with high efficiency by one operation while being arranged at a fixed position. . Further, since the grinding wheels 9 and 9 are rotated by the directly connected motors 10 and 10, the conduction mechanism such as gears is omitted to simplify the structure, and conduction failure occurs due to adhesion of grinding dust due to polishing. Therefore, the grinding wheel 9 can be smoothly rotated at a high speed. b A pipe inner diameter measuring sensor 26 capable of measuring the inner radius of the pipe at least in front of the revolution direction near each grinding wheel 9 is provided so that the driving of the grinding wheel 9 can be controlled. Since it is possible to operate the slide mechanism while monitoring the measurement result according to, it is possible to easily polish the inner surface of the conduit P to a desired and accurate size, and to operate the slide mechanism arbitrarily. Since it can be controlled, it is possible to properly select the polishing allowance and perform the polishing, and not only can the polishing operation be performed efficiently, but also that a severe load is applied to the grinding wheel 9 and the entire equipment. Without, it can be used for a long time.

C As a slide mechanism, a substantially arcuate slider 13 is slidably supported on the holding frame 8 at both end portions thereof, and the engaging member 1 is provided near both ends of the slider 13.
A feed screw 17 that engages the motors 9 and 20 and is driven separately by a reversible motor 21 is provided, the engagement members 19 and 20 are screwed into the feed screw 17, and the feed screws 17 engage the engagement members 19 and 20. Since the slider 13 is configured to be advanced and retracted in the radial direction via the, the long cylindrical grinding wheel 9 is stably supported by the slider 13 while keeping parallel to the axis of the pipe line P. It is possible to easily move back and forth in the radial direction, and it is possible to manufacture the equipment itself in a remarkably small size. d By providing an even number of cylindrical grinding wheels 9 and 9 and selecting the grinding wheels 9 and 9 so that adjacent ones rotate in opposite directions, the reaction force due to the rotation of the grinding wheels 9 and 9 and the grinding load. Can be effectively offset to suppress the rotation of the main body 1 of the apparatus, and the main body 1 can be stably maintained by the guides 3 and 3. Therefore, accurate inner surface grinding can be easily performed.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a polishing device for an inner surface of an underground buried pipe.

FIG. 2 is a vertical sectional front view of a polishing device.

FIG. 3 is a vertical cross-sectional end view of a main part of a slide mechanism.

FIG. 4 is a vertical sectional side view of a main part in another embodiment.

FIG. 5 is a vertical cross-sectional end view of a main part of a slide mechanism according to another embodiment.

[Explanation of symbols]

 1 Main Body 3 Guide 8 Holding Body 9 Grinding Wheel 10 Motor 13 Slider 17 Feed Screw 19 Engaging Member 20 Engaging Member 21 Reversible Motor 23 Motor 26 Pipe Inner Diameter Measurement Sensor 27 Touch Piece 32 Proximity Sensor P Pipeline

Claims (4)

[Claims] 1. A plurality of cylindrical grinding wheels (9) are attached to a main body (1) provided with guides (3), (3) near both ends.
While supporting the holding frame (8) on the main body (1) while supporting the holding frame (8) in a state where they can be brought into contact with and separated from the shaft center of the main body (1) by a slide mechanism while keeping the parallel state with each other. The grinding wheel (9),
While allowing (9) to rotate by the directly connected motors (10) and (10), it can be revolved by the rotation of the holding frame (8) by another motor (23), and each grinding wheel (9) A pipe inner diameter measuring sensor (26) capable of measuring a pipe inner surface radius near at least the front in the direction of revolution is provided to control the drive of the grinding wheel (9), and at the same time, the pipe inner diameter measuring sensor (26). A polishing device for an inner surface of an underground buried pipe, wherein the slide mechanism can be operated based on a measurement result of the above. 2. A slider (13) having a substantially arcuate shape as a slide mechanism is slidably supported on the holding frame (8) at both end portions thereof, and an engaging member (19) is provided near both ends of the slider (13). A feed screw (17) which slidably engages the (20) in the tilt direction and is driven by a reversible motor (21) is provided, and the feed screw (17) is provided with the engaging member (19), Screw (20) and feed screw (17)
The polishing device for the inner surface of the underground buried pipe according to claim 1, wherein the slider (13) is moved forward and backward through the engaging members (19) and (20) by the rotation. 3. A pipe inner diameter measuring sensor (26) is provided with a touch piece (27) biased so as to project in a radial direction, and the advancing / retreating of the touch piece (27) is controlled by a proximity sensor (32) or a proximity switch. The polishing device for the inner surface of the underground buried pipe according to claim 1, wherein the type of detection is adopted. 4. The polishing apparatus for an inner surface of an underground buried pipe according to claim 1, wherein an even number of cylindrical grinding wheels (9), (9) adjacent to each other rotate in opposite directions.