KR20100078553A - Blasting apparatus and control method for vacuum pressure of the blasting apparatus - Google Patents

Abstract

PURPOSE: A blasting machine and an internal pressure control method thereof are provided to collect abrasive and contaminant by preventing the excessive increase of a vacuum pressure. CONSTITUTION: A blasting machine(100) comprises a pressure measurement unit(134), an internal pressure controlling unit(130), and a vacuum control unit. The pressure measurement unit is installed on one side of the blasting unit(140). The pressure measurement unit measures the inner pressure of the blasting unit. The internal pressure controlling unit is installed in a vacuum control line(154), and the vacuum control line supplies the air to the blasting unit. The internal pressure controlling unit controls the amount of the air provided to the blasting unit.

Description

BLASTING APPARATUS AND CONTROL METHOD FOR VACUUM PRESSURE OF THE BLASTING APPARATUS}

The present invention relates to a blasting apparatus and an internal pressure adjusting method, and more particularly, to provide a blasting apparatus and an internal pressure adjusting method for maintaining a constant suction force of the blasting unit and facilitating recovery of abrasives and contaminants.

In general, since the joint portion of the ship shell may be easily corroded and contaminated after welding, it is common to paint the joint portion to prevent it. In order to apply the coating, before the painting work, contamination and rust of the welding part should be removed in advance through surface treatment such as grinding or blasting to inject abrasive.

Since the work on the hull shell is performed at a relatively high position, the working environment is poor and dangerous, and thus surface treatment is performed by using a vacuum suction blasting apparatus rather than by hand. The blasting apparatus is attached to the hull shell by providing a vacuum pressure, and the abrasive for blasting is sprayed on the hull shell and priced.

1 and 2 are shown for more detailed description. 1 is a blasting apparatus described in Patent No. 10-526775, and FIG. 2 is a cross-sectional view of the apparatus attached to the hull shell using the vacuum pressure described in Patent No. 10-464462.

As shown in FIG. 1, the blasting apparatus 10 is connected to the pulley 20 at the top of the hull, and the first wire 40 and the second wire 50 fixed to the fixture 30 at the bottom of the hull are blasting apparatus. It is formed to pass through the first roller 11 and the second roller 12 of 10 to prevent the fall. The first wire 40 and the second wire 50 are connected to the motor unit 60 driven by the control unit 70 to maintain a constant tensile force.

The blasting apparatus 10 works in a state of being attached to the hull outer wall 100 by a vacuum pressure through an adsorption part. A vacuum brake is used as a device for maintaining a constant vacuum pressure, and the shape of the vacuum brake is shown in FIG. 2 is shown.

The vacuum brake 39 serves to maintain a vacuum pressure or to allow continuous operation without the accumulation of grit in the vacuum suction hose. For example, the suction plate 39c having the spring 39a is provided. When the lower portion is lowered, the outside air is introduced through the hole (29b) to maintain a constant vacuum pressure, on the contrary, when the vacuum pressure drops, the suction plate (39c) is raised to reduce the inflow of the outside air. During the initial blasting operation, the suction plate 39c maintains a constant clearance to perform the operation while continuously introducing outside air. In addition, when setting the initial vacuum pressure, it adjusts with the fixing nut 39d.

However, despite the various fall prevention devices described with reference to FIGS. 1 and 2, the airtightness between the hull wall and the carriage pad is not maintained, and as the fluid flows from the outside, the suction force of the vacuum brake decreases, causing the blasting device to fall from the wall. There is a risk. Here, when the pressure inside the pad drops below -0.2 kgf / cm 2 while the blasting apparatus is running, there is a problem that the blasting apparatus is separated from the wall. On the other hand, if the vacuum pressure in the vacuum pad is increased too much, the stability against adhesion is secured, but the fluid flow in the vacuum pad is not smooth, and the pretreatment quality of the surface to be coated is poor and the recovery of abrasives and contaminants is not smooth. have.

Therefore, while maintaining the vacuum pressure within the range in which the robot can move within the pad, an appropriate amount of fluid is introduced into the pad to enable a smooth recovery of the abrasive, and thus, the blasting apparatus is urgently needed.

The present invention has been made in view of the above problems, to provide a blasting device and an internal pressure control method that can ensure the stability by preventing the fall of the vacuum adsorption force to prevent the fall.

It is another object of the present invention to provide a blasting apparatus and an internal pressure control method which facilitates recovery of abrasives and contaminants by preventing excessive increase in vacuum pressure.

According to embodiments of the present invention for achieving the above object of the present invention, a blasting apparatus capable of finely adjusting the suction force without a bulky mechanical vacuum breaker is provided on one side of the blasting unit, the blasting Pressure measurement unit for measuring the internal pressure of the unit, the internal pressure control unit for adjusting the amount of air supplied to the blasting unit is provided on the vacuum control line for supplying air to the blasting unit and the pressure measuring unit It is configured to include a vacuum control unit for controlling the operation of the internal pressure control unit according to the result.

Here, the internal pressure adjusting unit includes a plurality of orifices having flow paths of different sizes and a solenoid valve provided in each orifice to open and close the orifices according to a signal of the vacuum control unit.

For example, the internal pressure control unit is provided with n orifices (where n is a natural number), and each of the n orifices is any one of 1 / n to n / n of the pipe size of the vacuum control line. It can be formed to have a flow path size of. In addition, the vacuum control unit opens and closes the solenoid valve so that an orifice having a flow path size corresponding to an air supply amount to be supplied to the blasting unit is opened.

On the other hand, according to other embodiments of the present invention for achieving the above object of the present invention, the method of adjusting the internal pressure of the blasting unit to be adsorbed to the surface to be coated by vacuum to perform a blasting (blasting) process on the surface, the blasting Measuring the internal pressure of the unit and adjusting the internal pressure of the blasting unit by adjusting the amount of air supplied from the internal pressure adjusting unit to the blasting unit according to the measured pressure. Here, the adjusting the internal pressure selectively opens one or more orifices among a plurality of orifices having flow paths of different sizes.

Here, the internal pressure adjusting unit is composed of orifices having n different flow paths of n (where n is a natural number) and n solenoid valves which are provided in one-to-one correspondence with the orifices to open and close the orifices. Each orifice may be formed to have a flow path size of 1 / n to n / n of the pipe size of the vacuum control line.

Further, the vacuum control unit opens and closes the solenoid valve so that at least one orifice is simultaneously opened, and at least one orifice is simultaneously opened and closed so that the combination of the open orifices has an open flow path size corresponding to the air supply amount to be supplied to the blasting unit. It works.

According to the present invention having the configuration as described above, first, by selectively opening and closing the orifice having the flow path of different sizes, it is possible to finely control the amount of air flowing into the blasting unit and to finely control the vacuum pressure inside the blasting unit I can regulate it.

Second, since the n orifices are formed to sequentially increase or decrease the cross-sectional area of the orifice such as 1 / n to n / n, it is easy to calculate the amount of air to be introduced into the blasting unit, and to control the pressure inside the blasting unit. It is easy.

In addition, by opening one or more orifices, it is easy to control the amount of air flowing into the blasting unit.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited or limited by the embodiments. In describing the present invention, a detailed description of well-known functions or constructions may be omitted for clarity of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. For reference, FIG. 3 is a configuration diagram of a blasting apparatus 100 according to an embodiment of the present invention, FIG. 4 is an internal pressure adjusting unit 130 of the blasting unit 140 in the blasting apparatus 100 of FIG. 3. 5 is a cross-sectional view for explaining an example of the internal pressure adjusting unit 130 of FIG. 4.

Referring to FIG. 3, the blasting apparatus 100 according to the present invention includes an abrasive supply unit 110, a blasting unit 140, an air supply unit 150, an internal pressure control unit 130, and a vacuum in which an abrasive is stored and supplied. The control unit 135 is included.

The abrasive supply unit 110 stores the abrasive used in the blasting process and supplies it to the blasting unit 140.

For reference, the abrasive described in the present invention is exemplified as a grit for spraying and polishing a surface of a large steel structure such as a ship (hereinafter referred to as a 'drawing surface') in a mixed state with air. The abrasive is combined with the air mixing line 152 through the abrasive supply line 115 in the abrasive supply unit 110 is supplied to the blasting unit 140. Here, the reference numeral 151 in FIG. 3 is an air supply line 151 for supplying air from the air supply unit 150 to the abrasive supply unit 110.

The abrasive used in the blasting unit 140 is reusable. In order to reuse the abrasive, a dust collector 120 for separating and collecting the waste abrasive which cannot be reused from the used abrasive, the impurities separated from the surface to be coated, and the like are provided. The dust collector 120 separates and collects a relatively heavy reusable abrasive, light weight waste abrasive and impurities using centrifugal force generated by rotating the abrasive recovered from the blasting unit 140 at high speed. do. Here, one side of the dust collecting unit 120 is connected to the air supply unit 150 is connected to the air suction line 125 for generating a suction force to the dust collecting unit 120, the other side of the dust collecting unit 120 An exhaust pump 121 for discharging the exhaust gas generated at 120 to the outside is provided.

The air supply unit 150 supplies air when the abrasive is supplied and recovered, and is in communication with all of the abrasive supply unit 110, the dust collecting unit 120, and the blasting unit 140. Specifically, the air supply unit 150 is connected to the dust collecting unit 120 provided in the abrasive supply unit 110 to generate a suction force in the dust collecting unit 120, is connected to the abrasive supply unit 110 and the abrasive supply unit A pressure is generated to press the abrasive inside 110 toward the abrasive supply line 115. The air supply unit 150 is connected to the blasting unit 140 to provide pressure to move the abrasive into the blasting unit 140 in the air mixing line 152 and to provide the blasting unit 140. It provides air that is mixed and sprayed with the abrasive through.

The blasting unit 140 receives the abrasive from the abrasive supply unit 110 and grinds the surface of the to-be-painted surface by spraying the abrasive mixed with air toward the to-be-painted state in a state where the abrasive is adsorbed by the vacuum. The blasting unit 140 is provided with a carriage pad 410 attached to the to-be-moved surface so as to be movable, and in which the vacuum is formed and maintained in the blasting unit 140 (hereinafter, referred to as a pad chamber 401). It is made). And one side of the blasting unit 140 is connected to the air mixing line 152 is supplied with the abrasive mixed with the air from the abrasive supply unit 110, the abrasive used in the blasting unit 140 is recovered and the An abrasive recovery line 141 for providing a vacuum in the blasting unit 140 is connected. For reference, the technical configuration of the blasting unit 140 is understood from the known technology and is not the gist of the present invention, detailed description and illustration are omitted.

On the other hand, in order to control the degree of vacuum in the blasting unit 140, the vacuum control line 154 is connected to the air supply unit 150 to supply air into the blasting unit 140. And on the vacuum control line 154 is provided with an internal pressure control unit 130 and a vacuum control unit 135 for adjusting the amount of air supplied through the vacuum control line 154.

4 and 5, a pressure measuring unit 134 is provided at one side of the blasting unit 140 to measure the pressure inside the pad chamber 401, and the vacuum control unit 135 is provided with the pressure. The internal pressure adjusting unit 130 is controlled according to the result measured by the measuring unit 134 to adjust the amount of air supplied into the blasting unit 140. For example, the pressure measuring unit 134 may use a conventional manometer or pressure sensor. The vacuum controller 135 may be a conventional power line controller (PLC).

The internal pressure control unit 130 is a solenoid valve for opening and closing the orifice (310) and the orifice (310) which is a supply passage of air to adjust the amount of air supplied from the vacuum control line (154) (solenoid valve) 330. Here, in the drawing, reference numeral 301 denotes a housing 301 forming an appearance of the internal pressure adjusting unit 130.

Here, the internal pressure adjusting unit 130 is provided in the plurality of orifices 310 and the orifices 310 having different sizes of flow paths and the plurality of solenoid valves 330 for opening and closing the orifices 310. Is made of.

The vacuum control unit 135 is formed to control the opening and closing operation of the solenoid valve 330, by opening the orifice 310 so as to correspond to a predetermined air inflow amount of a predetermined amount of air into the blasting unit 140. Allow inflow. In this case, the solenoid valve 330 is normally closed (validally closed) valve is used, the vacuum control unit 135 operates the predetermined solenoid valve 330, the corresponding orifice 310 is opened.

In addition, since the internal pressure adjusting unit 130 is composed of a plurality of orifices 310 having different flow path sizes, the amount of air introduced into the blasting unit 140 by opening and closing the respective orifices 310 is fine. Can be adjusted.

For example, since the orifice 310 is formed to increase or decrease the cross-sectional area of the flow path at a predetermined rate, the supply amount of air introduced through the internal pressure control unit 130 is also at a predetermined rate according to the increase or decrease of the cross-sectional area of the orifice 310. Supply increases and decreases. For example, as shown in FIG. 5, the internal pressure adjusting unit 130 includes eight orifices 311, 312, 313, 314, 315, 316, 317, and 318 and eight solenoid valves 331 and 332. , 333, 334, 335, 336, 337, and 338. The eight orifices 311, 312, 313, 314, 315, 316, 317, and 318 are respectively 1/8, 2/8, 3/8, and 4/8 of the flow path size of the vacuum control line 154. , 5/8, 6/8, 7/8, 8/8. Accordingly, the vacuum control line 154 according to the orifices 311, 312, 313, 314, 315, 316, 317, and 318 that are opened among the orifices 311, 312, 313, 314, 315, 316, 317, and 318. ), The amount of air supplied can be adjusted as 1, 7/8, 6/8, 5/8, 4/8, 3/8, 1/8, 1/8, 0.

However, the present invention is not limited by the drawings, and the number of the orifices 310 and the solenoid valves 330 may vary substantially. In addition, since the size of the passage opening in the internal pressure control unit 130 may be achieved by the combination of one or more orifices 310, the vacuum control unit 135 is formed to open and close one or more solenoid valves 330. It is also possible.

According to the present invention, by increasing or decreasing the amount of air supplied into the blasting unit 140, the pressure in the pad chamber 401 can be constantly adjusted and the appropriate vacuum degree can be maintained so that the adsorption force of the blasting unit 140 is maintained. It can reduce the risk of fall and fall and prevent over-vacuum.

Specifically, when the internal pressure of the blasting unit 140 increases above a certain size, that is, when the degree of vacuum decreases, the blasting unit 140 falls on the surface while the suction force of the blasting unit 140 decreases. There is a danger. For example, when the internal pressure of the blasting unit 140 falls below -0.2 kgf / cm 2, the blasting unit 140 may be separated from the surface to be coated.

On the contrary, when the internal pressure of the blasting unit 140 decreases to a predetermined size or less, that is, when the degree of vacuum is increased, the fluid does not flow smoothly inside the blasting unit 140 due to the over-vacuum phenomenon. The pretreatment quality is poor and the recovery of abrasives and contaminants is not smooth. For example, the blasting unit 140 may be over-vacuum when the internal pressure increases to more than -0.3kgf / ㎠. However, the present invention not only maintains the internal pressure of the blasting unit 140 within a predetermined range, but also quickly and precisely with respect to a change in the internal pressure of the blasting unit 140. The pressure can be adjusted.

Hereinafter, operations of the internal pressure regulating unit 130 and the vacuum control unit 135 having the above-described configuration will be described in detail with reference to FIGS. 6A and 6B. Hereinafter, flow path sizes corresponding to 1/8, 2/8, 3/8, 4/8, 5/8, 6/8, 7/8, and 8/8 of the flow path size of the vacuum control line 154 will be described. An internal pressure adjusting unit 130 provided with eight orifices 310 having the same will be described as an example. In addition, the eight orifices 311, 312, 313, 314, 315, 316, 317, and 318 and the eight solenoid valves 331, 332, 333, 334, 335, 336, 337, and 338 for convenience of description. Are the first to eighth orifices 311, 312, 313, 314, 315, 316, 317, and 318 and the first to eighth valves 331, 332, and the like. 333, 334, 335, 336, 337, 338).

The vacuum controller 135 controls the solenoid valves 331, 332, 333, 334, 335, 336, 337, and 338 according to the internal pressure of the blasting unit 140 measured by the pressure measuring unit 134. By opening and closing the orifice 310, the amount of air supplied from the vacuum control line 154 to the blasting unit 140 is adjusted. Particularly, the vacuum control unit 135 and the internal pressure adjusting unit 130 supply air to the blasting unit 140 when the internal pressure of the blasting unit 140 becomes an over-vacuum state. Over-vacuum of 140 can be eliminated.

In addition, the solenoid valve 330 is a normally closed valve, and the vacuum control unit 135 operates the solenoid valve 330 provided in the orifice 310 corresponding to the amount of air to be supplied. Accordingly, as the corresponding orifice 310 is opened, as much air as the open orifice 310 is supplied into the blasting unit 140.

For example, the vacuum control unit 135 passes through the internal pressure adjusting unit 130 to the blasting unit 140 when the pressure inside the blasting unit 140 becomes over vacuum than −0.4 kgf / cm 2. By supplying air to increase the pressure in the blasting unit 140 to lower the degree of vacuum. In addition, the vacuum control unit 135 controls the open cross-sectional area of the orifice 310 to increase or decrease by 1/8 as the internal pressure of the blasting unit 140 increases or decreases by 0.02 kgf / cm 2. Here, since the internal pressure of the blasting unit 140 is a vacuum pressure, the internal pressure of the blasting unit 140 is represented by (−), and the greater the absolute value of the internal pressure, the higher the internal pressure of the blasting unit 140 becomes.

First, when the internal pressure of the blasting unit 140 is more than -0.4 kgf / cm 2 (S11), the vacuum control unit 135 closes all the solenoid valves 330 and air into the blasting unit 140. Block the supply of (S110).

Next, when the internal pressure of the blasting unit 140 is less than −0.4 kgf / cm 2 (S12), the vacuum control unit 135 operates the solenoid valve 331 first to open the orifice 311. Then, the air corresponding to 1/8 of the amount of air supplied from the vacuum control line 154 is supplied into the blasting unit 140 (S120).

Next, when the internal pressure of the blasting unit 140 is more than -0.42 kgf / cm 2 -0.4 kgf / cm 2 or less (S13), the vacuum control unit 135 operates the solenoid valve 332 twice. Burn orifice 312 is opened, the air corresponding to 2/8 of the amount of air supplied from the vacuum control line 154 into the blasting unit 140 is supplied (S130).

As such, the vacuum controller 135 controls the open cross-sectional area of the orifice 310 to increase by 1/8 as the internal pressure of the blasting unit 140 decreases by 0.02 kgf / cm 2. Here, the steps S14 to S18 in FIGS. 6A and 6B are substantially the same as the above-described steps, and thus will be omitted for convenience of description.

And when the internal pressure of the blasting unit 140 is more than -0.58kgf / ㎠ (S20), all the solenoid valves (331, 332, 333, 334, 335, 336, 337, 338) while the eight The orifices 311, 312, 313, 314, 315, 316, 317, 318 are all opened (S200).

Meanwhile, in the above-described embodiment, an orifice 310 is opened according to a preset air supply amount, which has been described as an example. This is to improve the control accuracy of the solenoid valve 330 by reducing the number of solenoid valves 330 that the internal pressure regulating unit 130 and the solenoid valve 330 is opened and closed at the same time to a minimum. to be. However, unlike the above-described embodiment, the size of the flow path to be opened corresponding to the preset air supply amount may be achieved by combining one or more orifices 310. For example, if 4/8 of the flow path size of the vacuum control line 154 is to be opened, the orifice 4 or 314 is opened or the orifice 311 and the orifice 3 are the same as in the above-described embodiment. 313 may be open at the same time. Similarly, the vacuum control unit 135 may control the opening and closing of the solenoid valve so that three or more orifices are opened to open a predetermined flow path size.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1 is a schematic view of a conventional general blasting apparatus;

2 is a partial side cross-sectional view of a conventional general blasting unit;

3 is a schematic view showing a blasting apparatus according to an embodiment of the present invention;

Figure 4 is a schematic view showing the configuration of the blasting apparatus and the internal pressure control of Figure 3;

5 is a cross-sectional view illustrating main parts for explaining an example of an internal pressure adjusting unit in the internal pressure adjusting unit of FIG. 4;

6A and 6B are flowcharts illustrating a vacuum control method of a blasting unit according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: blasting apparatus 110: abrasive supply portion

115: abrasive supply line 120: dust collector

121: exhaust pump 125: air suction line

130: internal pressure adjusting unit 134: pressure measuring unit

135: vacuum control unit 140: blasting unit

141: abrasive recovery line 150: air supply

151: air supply line 152: air mixing line

154: vacuum control line 301: housing

310: orifice 330: solenoid valve

401: pad chamber 410: carriage pad

Claims (7)

A blasting apparatus comprising a blasting unit which is adsorbed on a surface of an object by vacuum and performs a blasting process on the surface of the object, A pressure measuring unit provided at one side of the blasting unit to measure an internal pressure of the blasting unit; An internal pressure control unit provided on a vacuum control line for supplying air to the blasting unit to adjust an amount of air supplied to the blasting unit; And A vacuum control unit controlling an operation of the internal pressure adjusting unit according to the result measured by the pressure measuring unit; Blasting device comprising a. The method of claim 1, The internal pressure adjusting unit, A plurality of orifices having flow paths of different sizes; And A solenoid valve provided at each orifice to open and close the orifice according to a signal from the vacuum control unit; Blasting apparatus comprising a. The method of claim 2, The internal pressure adjusting unit, n (where n is a natural number) orifices are provided, And each of the n orifices is formed to have a flow path size of any one of 1 / n to n / n of the pipe size of the vacuum control line. The method of claim 3, And the vacuum control unit opens and closes the solenoid valve so that an orifice having a flow path size corresponding to an air supply amount to be supplied to the blasting unit is opened. In the method of controlling the internal pressure of the blasting unit which is adsorbed to the surface to be coated by vacuum to perform a blasting (blasting) process on the surface, Measuring the internal pressure of the blasting unit; And Adjusting an internal pressure of the blasting unit by adjusting an amount of air supplied from the internal pressure adjusting unit to the blasting unit according to the measured pressure; Including, The internal pressure control step of the internal pressure control method of the blasting apparatus, characterized in that for selectively opening one or more of the plurality of orifices having flow paths of different sizes. The method of claim 5, Internal pressure regulator, an orifice having n different flow paths, wherein n is a natural number; And N solenoid valves provided in one-to-one correspondence with the orifices to open and close the orifices; Including, Wherein each orifice is formed to have a flow path size of 1 / n to n / n of a pipe size of the vacuum control line. The method of claim 6, The vacuum control unit opens and closes the solenoid valve to open at least one orifice at the same time, And at least one orifice is simultaneously opened and closed such that the combination of the open orifices has an open flow path size corresponding to the air supply amount to be supplied to the blasting unit.

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