KR20110003622A - Inside grinding apparatus of cast iron pipe with ellipse or curved shape - Google Patents

Abstract

PURPOSE: An apparatus for grinding the inside of a cast iron pipe of ellipse or curved shape is provided to improve abrasion efficiency since air is discharged for the removal of dust with cooling a flexible shaft. CONSTITUTION: An apparatus for grinding the inside of a cast iron pipe of ellipse or curved shape comprises a grinding rotating unit(100), a transport unit(200), a rotation support units(400), a lifting unit(300), and a controller. The grinding rotating unit rotates abrasive(130) with a rotary motor(110) to grind the inside of a cast iron pipe(P). The transport unit transfers the grinding rotating unit, so abrasive moves forward and backward along the inside of the cast iron pipe. The rotation support unit rotates and supports the cast iron pipe. The lifting unit lifts the grinding rotating unit. The controller controls the height of the grinding rotating unit.

Description

Inside grinding apparatus of cast iron pipe with ellipse or curved shape}

The present invention relates to an elliptical tube or curved tube inner surface polishing apparatus, more specifically an ellipse that can be polished with a uniform polishing pressure when polishing the inner surface of the cast iron tube of the oval or curved tube shape as well as the straight tube shape. A cast iron pipe inner surface polishing apparatus in the form of a pipe or a curved pipe.

In order to paint the inner surface of the cast iron pipe, it is necessary to polish the inner surface of the pipe by prior work to remove various foreign substances, scale, slag, weld bead, etc.

Polishing apparatus for polishing the inner surface of the tube is generally fixed to the outer peripheral surface of the polishing rod and coupled to the pipe to polish the inner surface while reciprocating and rotating the polishing rod.

However, the conventional pipe inner surface polishing apparatus performs cutting by grinding stone by simply lowering or cutting the tip of the polishing rod in the pipe. However, in the case of an elliptical tube or a curved tube rather than a circular tube, the abrasive stone corresponding to the inner surface is polished with a constant cutting force. It was very hard.

In addition, when the abrasive is worn, the cutting force is lowered and the abrasive is abrasion wear has a disadvantage of frequent replacement of the abrasive stone.

In particular, when the cross section of the cast iron pipe is elliptical rather than round, the curved pipe which is not a straight pipe or when the polishing pressure is reduced due to the wear of the abrasive stone is not appropriately maintained to maintain a constant polishing pressure, thereby reducing the polishing state or polishing efficiency. There is this.

The present invention has been made to solve the above problems is an object of the present invention is to control the height of the polishing axis to uniformly cut the elliptical tube or elliptical tube to uniformly reduce the polishing pressure applied to the abrasive during polishing Another object is to provide an inner surface polishing apparatus of a cast iron pipe.

In order to achieve the above object, the present invention inserts an abrasive shaft equipped with an abrasive into a cast iron pipe, and rotates the abrasive with a rotating motor to polish the inside of the cast iron pipe, and the abrasive rotating part transfers the abrasive rotating part to the inside of the cast iron pipe. In the cast iron pipe internal polishing apparatus consisting of a conveying unit for moving forward and backward along the rotation and the support for rotating the cast iron pipe, an elevating unit for elevating the polishing rotating unit is provided on the conveying unit, the rotary motor due to friction between the abrasive and the cast iron pipe inner surface A control unit is provided to control the lifting of the lifting unit according to the load current applied to adjust the height of the polishing rotating unit, and the polishing material is performed while maintaining a constant polishing pressure with an inner surface of the cast iron pipe having an elliptical cross section or a curved pipe shape. The inner surface of cast iron pipe can be polished uniformly The features.

Here, the elevating portion is a guide support which is installed on the conveying portion, a lifting plate which slides up and down along the guide support and the polishing rotating portion is installed on the upper portion, and a screw coupled to the lifting plate lower to lift the lifting plate It is characterized in that it is composed of a jack and the lifting motor which is installed on the conveying unit to drive the screw jack.

In addition, the control unit is installed in the rotary motor by comparing the current sensor for measuring the current applied to the rotary motor, and the measured value measured by the current sensor and a predetermined set value by sending a control signal to the lifting unit by the polishing Characterized in that it can be configured as a controller for adjusting the height of the rotating portion.

The polishing shaft has a hollow tube shape, and the polishing shaft includes a flexible shaft for connecting the rotary motor and the abrasive, and an injection hole for injecting air and a discharge hole for discharging air are formed on the polishing shaft. It is characterized by.

On the other hand, the transfer unit is characterized in that the transfer rail is installed on the bottom, a transfer bogie moving forward and backward on the transfer rail and the lifting portion is fixed to the upper portion, and a transfer motor installed in the transfer bogie to drive the transfer bogie It is done.

Preferably, the rotation support portion is characterized in that the lower part of the cast iron pipe is composed of a roller for rotatably supporting the cast iron pipe, a support motor for rotationally driving the roller, and a lift cylinder for driving the roller and the support motor.

The effect of the present invention by the configuration as described above can not only uniformly polish the inner surface of the cast iron pipe of the elliptical tube or curved tube cross section, it is possible to perform a uniform polishing operation even if the abrasive is worn.

In addition, as the air injected into the polishing shaft cools and releases the flexible shaft, dust is removed to increase polishing efficiency.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. The following description and the accompanying drawings are presented for the overall understanding of the present invention, and thus the technical scope of the present invention is not limited thereto. And a detailed description of known configurations and functions that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a block diagram showing an inner surface polishing apparatus of an elliptical tube or a curved tube according to an embodiment of the present invention.

The present invention may be configured to include a grinding rotary unit 100, the transfer unit 200, the lifting unit 300, the control unit, the rotation support unit 400 to refer to the large bar.

First, the polishing rotating part 100 is to perform polishing by rotating the abrasive 130 inserted into the inner surface of the cast iron pipe (p), the rotary motor 110, the polishing shaft 120, the abrasive 130, the flexible shaft ( 140).

The rotary motor 110 is coupled to the flexible shaft 140 by the coupling 150 and the abrasive 130 is coupled to the front end of the flexible shaft 140.

The flexible shaft 140 coupled to the rotary motor 110 is installed in the polishing shaft 120 so that the polishing shaft 120 has a hollow tube shape. In addition, the polishing shaft 120 is preferably fixed and supported by the fastener 160 on the lifting plate 320 of the lifting unit 300 to be described later.

Therefore, while the abrasive shaft 120 is inserted into the cast iron pipe p, the abrasive 130 coupled to the front end of the flexible shaft 140 rotates by the rotary motor 110, thereby rotating the inner surface of the cast iron pipe p. Polishing

The abrasive 130 is polished in a state where the abrasive stone is appropriate and in contact with the inner surface of the lower side of the cast iron pipe (p).

Figure 2 is a detailed view showing the abrasive rotating portion of the present invention shown in FIG. Referring to FIG. 2, the grinding shaft 120 functions to guide the flexible shaft 140 in a fixed state without rotation and injects compressed air into an outer circumferential surface. And a discharge hole 124 through which air may be discharged to the outside. Here, it is preferable that the plurality of discharge holes 124 is formed while continuously drawing a circle along the outer circumferential surface of the polishing shaft 120.

That is, since the flexible shaft 140 rotating inside the polishing shaft 120 is flexible, the flexible shaft 140 rotates and collides with the inner surface of the polishing shaft 120 to generate frictional heat. When a separate device for supplying compressed air is connected, the high pressure air is injected into the injection hole 122 to cool the heated flexible shaft 140. In addition, as the heated air is discharged through the plurality of discharge holes 124, dust adhered to the inner surface of the cast iron pipe p during wear may be removed to improve wear efficiency.

Next, the conveying unit 200 may be composed of a conveying rail 210, a conveying bogie 220, a conveying motor 230, the conveying bogie 220 may be moved forward and backward by conveying the polishing rotating part 100. The transport cart 220 moves on the transport rail 210 installed on the floor.

And the transfer motor 230 is installed on the transfer cart 220 to provide power to the transfer cart 220 to be moved forward and backward on the transfer rail 210.

Therefore, as the feed cart 220 moves forward and backward, the polishing rotating part 100 moves forward and backward, wherein the polishing shaft 120 and the abrasive 130 move forward and backward along the inside of the cast iron pipe p.

Next, the lifting unit 300 for elevating the polishing rotating unit 100 will be described.

The lifting unit 300 may be composed of a guide support 310, a lifting plate 320, a screw jack 330, the lifting motor 340, the guide support 310 is shown in the transfer unit It is installed on the feed cart 220 of 200 and a pair is installed standing on both sides is provided higher than the cast iron pipe (p) is installed horizontally for polishing.

The lifting plate 320 is slidably coupled to the guide support 310 to move up and down. The elevating plate 320 has a flat plate shape, and the rotary motor 110 and the fixture 160 of the polishing rotating unit 100 are installed on the upper portion thereof.

The screw jack 330 is coupled to the lower portion of the elevating plate 320 and is driven by the elevating motor 340 installed on the carriage carriage 220.

The screw jack 330 is a known configuration, briefly described, is composed of a screw shaft and a worm gear therein to drive the worm gear coupled to the lifting motor 340 to move the screw shaft vertically disposed with the worm gear up and down It is a structure that can lift an object.

The screw jack 330 is suitable for precisely adjusting the lifting height, and can be precisely controlled by a controller to be described later by installing the lifting motor 340 as a servo motor.

Next, the control unit (not shown) is composed of a current sensor (not shown) and a controller (not shown) to control the lifting unit 300 according to the load applied to the rotary motor 110 by the polishing rotating unit 100 Adjust the height.

The current sensor is installed in the rotary motor 110 to measure the current supplied to the rotary motor 110 from the outside to send to the controller, the abrasive 130 by friction when polishing the inner surface of the cast iron pipe Torque load is applied to the rotary motor 110, which causes a change in the current supplied to the rotary motor 110.

This change is measured by the current sensor and sent to the controller, which is programmed as a computer to control the operation of the lifting unit 300.

That is, the control signal is sent to the lifting unit 300 by comparing the measured values measured by the current sensor while the preset current value is input to the controller. Therefore, when the load is high on the rotary motor 110 and the measured value is larger than the set value, the lifting plate 320 is controlled to rise so that the abrasive 130 falls slightly from the inner surface of the cast iron pipe (p). This decreases.

However, when the load is small and the measured value is smaller than the set value, the lifting plate 320 is controlled to descend so that the abrasive 130 is in close contact with the inner surface of the cast iron pipe p, thereby increasing the polishing pressure. To further strengthen.

Since the abrasive 130 is controlled in this manner, the abrasive 130 is polished in a state of being in close contact with the inner surface of the cast iron pipe p, so that uniform polishing can be performed.

Next, the rotary support unit 400 is configured to support the cast iron pipe (p) while rotating, it may be composed of a roller 410, the support motor 420, the lifting cylinder 430, and referring to the bar as shown above The cylinder 430 is installed and the support motor 420 is provided on the lifting cylinder 430, the roller 410 is rotated by the support motor 420 on the support motor 420 and the roller The cast iron pipe p to be polished is placed in 410.

That is, since the lifting cylinder 430 drives the support motor 420 and the roller 410 up and down, the cast iron pipe p is placed on the roller 410 in the state of lifting up and down at an appropriate height and the support motor 420. ), The cast iron pipe p rotates in a supported state.

Hereinafter will be described a preferred operating state of the present invention.

The cast iron pipe (p) to be polished is placed in the roller 410, the lifting cylinder 430 is driven and fixed to an appropriate height, and then the support motor 420 is driven, so that the roller 410 rotates and the cast iron pipe ( p) also starts to rotate.

Then, the elevating plate 320 is driven to the appropriate height by driving the elevating motor 340, and the height of the polishing shaft 120 installed on the elevating plate 320 can be inserted into the cast iron pipe p. Secure to hold.

Next, the feed cart 220 is advanced to allow the polishing shaft 120 to be inserted into the cast iron pipe p, and then stop the feed cart 220.

Again, the height of the lifting plate 320 is adjusted so that the abrasive 130 is brought into close contact with the inner surface of the lower side of the cast iron pipe p, and then when the rotary motor 110 is driven, the abrasive is rotated along with the rotation of the flexible shaft 140. 130 is rotated to start polishing the inner surface of the cast iron pipe (p).

Grinding a certain point inside the cast iron pipe (p) is the transfer cart 220 can be moved forward or backward to polish another point.

By the way, if the cross section of the cast iron pipe (p) is an ellipse or the whole is a curved pipe along the longitudinal direction, the abrasive 130 is in close contact with the inner surface of the cast iron pipe (p) in accordance with the forward and backward movement of the feed cart (220). This results in a change in polishing pressure, which reduces the polishing efficiency. In addition, when the grinding operation is performed for a long time, the abrasive 130 is worn and the same is the case that the frictional force is reduced.

Therefore, in the present invention, the current sensor of the control unit measures the load current applied to the rotary motor 110 according to the change in the polishing pressure and transmits it to the controller, the controller is compared with the already set value the lifting motor 340 Controlling the rising and falling of the elevating plate 320 by sending a control signal to.

As a result, the height of the elevating plate 320 is adjusted by the controller according to the change of the polishing pressure (friction force) between the abrasive 130 and the inner surface of the cast iron pipe p, thereby performing polishing at a constant polishing pressure. Not only can the inner surface of the cast iron pipe (p) in the form of a pipe or a curved tube can be uniformly polished, but the polishing can be performed while maintaining the same polishing pressure even when the abrasive 130 is worn.

Meanwhile, if the compressed air is blown into the polishing shaft 120 through the injection hole 122 while the polishing is in progress, the air is released through the discharge hole 124 by air cooling the flexible shaft 140. Polishing dust stuck to the inner surface of the cast iron pipe (p) being polished can be removed to maximize polishing efficiency.

As described above, the present invention controls the height by elevating the polishing rotating part to allow the abrasive to be polished at a constant polishing pressure with the inner surface of the cast iron pipe, thereby achieving uniform polishing, and cooling and removing dust through air. The technical scope of the present invention may be set forth with reference to the accompanying drawings, which is merely an exemplary embodiment, and the true scope of the present invention should be determined by the claims.

1 is a block diagram showing an inner surface polishing apparatus of an elliptic tube or a curved tube according to an embodiment of the present invention.

Figure 2 is a detailed view showing the abrasive rotating portion of the present invention shown in FIG.

<< Explanation of main parts of drawing >>

100: polishing rotating part 110: rotating motor

120: grinding shaft 122: injection hole

124: discharge hole 130: abrasive

140: flexible shaft 150: coupling

160: fixture

200: transfer unit 210: transfer rail

220: transport cart 230: transport motor

300: lifting unit 310: guide support

320: lifting plate 330: screw jack

340: lifting motor

400: rotation support 410: roller

420: support motor 430: lifting cylinder

p: cast iron pipe

Claims (6)

An abrasive rotating part 100 for inserting the abrasive shaft 120 with the abrasive 130 into the cast iron pipe p and rotating the abrasive 130 with the rotary motor 110 to polish the inside of the cast iron pipe p; The abrasive device inside the cast iron pipe is composed of a conveying part 200 for conveying the abrasive rotating part 100 so that the abrasive 130 is moved back and forth along the inside of the cast iron pipe (p) and a rotation support part 400 for rotating the cast iron pipe (p). To On the conveying part 200, an elevating part 300 for elevating the polishing rotating part 100 is installed. Control unit for adjusting the height of the polishing rotating part 100 by controlling the lifting of the lifting unit 300 according to the load current applied to the rotary motor 110 due to the friction between the abrasive 130 and the inner surface of the cast iron pipe (p). Is equipped with, The abrasive 130 is an elliptical tube or curved tube, characterized in that the cross-section is elliptical or curved pipe shape of the cast iron pipe (p) while maintaining a constant polishing pressure and the polishing operation is performed to uniformly polish the inner surface of the cast iron pipe (p). Cast iron pipe inner surface polishing machine. The method of claim 1, The lifting unit 300, A guide support 310 installed on the transfer part 200, a lifting steel plate 320 sliding up and down along the guide support 310, and the polishing rotating part 100 is installed on an upper portion thereof, and the lifting plate ( 320 is coupled to the lower screw jack 330 to elevate the elevating plate 320, and the lifting motor 340 is installed on the conveying part 200 to drive the screw jack 330 Cast iron pipe inner surface polishing apparatus of the elliptical tube or curved tube. The method of claim 1, The control unit, A control signal installed on the rotary motor 110 to compare the current sensor measuring the current applied to the rotary motor 110 with the measured value measured by the current sensor and a preset set value to the lifting unit 300. Cast iron pipe inner surface polishing apparatus of the elliptical tube or curved tube characterized in that it can be configured as a controller for adjusting the height of the polishing rotating part 100 by sending a. The method of claim 1, The polishing shaft 120 has a hollow tube shape, the inside of the polishing shaft 120 is provided with a flexible shaft 140 for connecting the rotary motor 110 and the abrasive 130, The inner surface of the polishing shaft 120, the injection hole 122 for injecting air and the discharge hole for discharging air is formed in the elliptical tube or curved tube inner surface polishing apparatus. The method of claim 1, The transfer unit 200, The transport rail 210 is installed on the floor, the transport cart 220 is moved forward and backward on the transport rail 210 and the lifting unit 300 is fixed to the upper and the transport cart 220 is installed on the Cast iron pipe inner surface polishing apparatus of the elliptical tube or curved tube characterized in that consisting of a transfer motor 230 for driving the feed cart (220). 6. The method according to any one of claims 1 to 5, The rotation support unit 400, The lower part of the cast iron pipe (p), the roller 410 for rotatably supporting the cast iron pipe (p), the support motor 420 for rotating the roller 410, and the roller 410 and the support motor 420 An elliptical tube or a curved pipe inner surface polishing apparatus, characterized in that the elevating cylinder (430) for elevating driving.

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