JP5869818B2 - Method of forming anticorrosion coating on metal valve box for valve - Google Patents

Description

  The present invention relates to a method for forming an anticorrosion coating on a valve metal valve box, in particular, an anticorrosion coating can be uniformly and efficiently formed on the outer surface of a valve metal valve box by thermal spraying, and the working environment is improved. The present invention relates to a method of forming an anticorrosion coating on a metal valve box for a valve, which is good and can reliably recover a non-adhered thermal spray material.

  For example, a straight pipe made of ductile cast iron has a shape close to two dimensions, and the control of the automatic spraying device is relatively easy. Therefore, the automatic spraying device uniformly and efficiently applies the anticorrosion coating to the outer surface of the straight pipe. It was already done.

  An apparatus for automatically forming an anticorrosion coating made of zinc or the like on the outer surface of a ductile cast iron straight pipe by thermal spraying is disclosed in Japanese Patent Application Laid-Open No. 5-222511. Hereinafter, this anti-corrosion coating film forming apparatus on the cast iron pipe is referred to as a conventional apparatus and will be described with reference to the drawings.

  FIG. 5 is a schematic perspective view showing a conventional apparatus.

  As shown in FIG. 5, the conventional apparatus includes a carriage 23 that can run on a rail 22 laid along the longitudinal direction of a ductile cast iron straight pipe 21, and a straight pipe 21 provided on the carriage 23. A plurality of rotating rollers 24 that rotate around the axis, and a spray gun 26 that sprays a spraying material such as zinc on the outer surface of the straight pipe 21 placed on the rotating roller 24 to form the anticorrosion coating 25; It consists of a laser irradiation device 27 that locally heats the anticorrosion coating 25 formed on the outer surface of the straight pipe 21 and a pressure roller 28 that presses the heated anticorrosion coating 25. The thermal spray gun 26, the laser irradiation device 27, and the pressure roller 28 are arranged in this order at intervals from the upstream side in the traveling direction of the carriage 23.

  According to the conventional apparatus, the anticorrosion coating 25 is automatically formed on the outer surface of the straight pipe 21 as follows.

  The straight pipe 21 is placed horizontally on the rotating roller 24, and the carriage 23 travels in the direction of arrow A in the figure, and the straight pipe 21 is rotated in the direction of arrow B in the figure by the rotating roller 24. Then, the spray gun 26, the laser irradiation device 27, and the pressure roller 28 are operated. Thereby, a spraying material such as zinc is sprayed on the outer surface of the straight pipe 21 by the spray gun 26 to form the anticorrosion coating 25. Thereafter, the anticorrosion coating 25 is locally heated by the laser irradiation device 27. Then, the locally heated anticorrosion coating 25 is pressed by the pressure roller 28. When the anticorrosion coating 25 is pressed by the pressure roller 28, the porous portion formed on the anticorrosion coating 25 is crushed. Thus, the anticorrosion coating 25 having excellent anticorrosion performance that is difficult for water and the like to permeate is automatically formed on the outer surface of the straight pipe 21.

Japanese Patent Laid-Open No. 5-222511

  As described above, according to the above-described conventional device, the anticorrosion coating 25 excellent in anticorrosion performance is automatically formed on the outer surface of the straight pipe 21, but the conventional device prevents corrosion on the outer surface of the valve metal valve box. A film cannot be formed.

  An example of the metal valve box for valves is shown. 6A and 6B are views showing a metal valve box for a valve, in which FIG. 6A is a front view and FIG. 6B is a side view.

  As shown in the drawing, the valve metal valve box 29 has a receiving port 30 at both ends and a valve rod mounting flange 31 at the center.

  The reason why the anticorrosion coating cannot be formed on the outer surface of the valve metal valve box by the conventional apparatus is as follows.

  As shown in FIG. 6, since the valve metal valve box 29 has a three-dimensional and complicated shape, the head of the thermal spray gun is always attached to the valve metal valve box 29 with respect to the fixed valve metal valve box 29. While facing the valve box 29, it is difficult to keep the distance between the spray gun and the valve metal valve box 29 constant. That is, in order to teach in advance the head direction of the thermal spray gun, the operation path, etc., and to perform automatic thermal spraying by the robot, since the movement of the thermal spray gun is complicated, the teaching takes a long time.

  Further, when the anticorrosion coating is manually formed, it is difficult to keep the distance between the spray gun head and the valve metal valve box 29 constant. If the distance between the spray gun head and the valve metal valve box 29 cannot be kept constant, the adhesion of the anticorrosion coating is inferior and the problem of peeling occurs.

  Furthermore, in the case of manual operation, it is difficult to move the spray gun at a constant speed along the shape of the valve metal valve box 29, so that the thickness of the anticorrosion coating cannot be kept uniform. Therefore, in order to maintain the anticorrosion performance, the anticorrosion film tends to be formed thicker than the specified value.

  In addition, in the case of manual operation, even if the dust mask is attached and work is performed under the dust collection hood, the molten metal is blown by air pressure, so the environment is poor due to scattering of mist-like particles and noise during spraying. Therefore, it is necessary to improve the working environment, and furthermore, the recovery / recycling efficiency of the non-adhered sprayed material is poor, so this improvement is also necessary.

  Therefore, the object of the present invention is to form a uniform and efficient anti-corrosion coating on the outer surface of the valve metal valve box by thermal spraying, and in addition, the working environment is good and the recovery of the non-adhered thermal spray material is ensured. The present invention provides a method for forming an anticorrosion coating on a metal valve box for valves.

  The present invention has been made to achieve the above object, and is characterized by the following.

The invention according to claim 1 is an anticorrosion by a robot in which a spray gun is attached to the outer surface of a valve metal valve box in which a receiving port is formed at both ends and a valve rod mounting flange is formed in the center. A method of forming a coating, wherein a plurality of valve box fixing means that are rotatable about a vertical axis are provided on a turntable at intervals along the rotation direction of the turntable, and the valve box fixing means When fixing the valve metal valve box by the above and forming the anti-corrosion coating on the outer surfaces of both ends of the valve metal valve box including the receiving port, the valve metal valve box is attached to the vertical axis. The spraying material is sprayed from the spraying gun fixed at a fixed position toward the metal valve box for the valve while being rotated as a center, and the first spraying is performed. Let it go down and spray the second time Next, the spray gun is further lowered by one step to perform the third spray, and in this way, the spray gun is sequentially lowered step by step to spray the spray material toward the valve metal valve box. When the anticorrosion coating is formed on the outer surface of the central portion of the valve metal valve box including the flange, the thermal spray gun is vertically oriented with respect to the valve metal valve box fixed at a fixed position. The first metal spraying is performed, and after the first thermal spraying is completed, the valve metal valve box is rotated by a predetermined angle around the vertical axis to perform the second thermal spraying, and then the valve metal The valve box is further rotated by a predetermined angle about the vertical axis to perform the third spraying, and thus the valve metal valve box is sequentially rotated by a predetermined angle about the vertical axis, For metal valve boxes for valves After spraying the thermal spray material and thus forming the anticorrosion coating on the entire outer surface of the valve metal valve box, the turntable is rotated to move the next valve metal valve box to the robot. On the other hand, it is characterized in that an anticorrosion film is formed on the next metal valve box for valves as in the previous case.

The invention according to claim 2 is an anticorrosion by a robot in which a spray gun is attached to the outer surface of a valve metal valve box in which a receiving port is formed at both ends and a valve rod mounting flange is formed in the center. A method of forming a coating, wherein a plurality of valve box fixing means that are rotatable about a vertical axis are provided on a turntable at intervals along the rotation direction of the turntable, and the valve box fixing means When fixing the valve metal valve box by the above and forming the anti-corrosion coating on the outer surfaces of both ends of the valve metal valve box including the receiving port, the valve metal valve box is attached to the vertical axis. The spraying material is sprayed from the spraying gun fixed at a fixed position toward the metal valve box for the valve while being rotated as a center, and the first spraying is performed. Let it go down and spray the second time Next, the spray gun is further lowered by one step to perform the third spray, and in this way, the spray gun is sequentially lowered step by step to spray the spray material toward the valve metal valve box. When the anticorrosion coating is formed on the outer surface of the central portion of the valve metal valve box, the thermal spray gun is moved in the horizontal direction with respect to the valve metal valve box fixed in place. The first spraying is performed, and after the completion of the first spraying, the spraying gun is lowered by one step to perform the second spraying, and then the spraying gun is further lowered by one step to perform the third spraying. In this way, the spray gun is sequentially lowered step by step to spray the spray material toward the valve metal valve box, thereby forming the anticorrosion coating on one half surface of the valve metal valve box. Next, the metal valve box for the valve is 180 ° rotated about the as in the case of one half, in which particular having features forming the corrosion protective coating on the other half of the metallic valve body valve.

  According to the present invention, the anticorrosion coating can be uniformly and efficiently formed on the outer surface of the valve metal valve box by thermal spraying, and the working environment is good, and the non-adhered thermal spray material can be reliably recovered. It is possible to provide a method for forming an anticorrosive coating on a metal valve box for valves.

It is a top view which shows the formation apparatus of the anti-corrosion film to the metal valve box for valves which implements this invention. It is a side view which shows the formation apparatus of the anticorrosion film to the metal valve box for valves which implements this invention. It is a front view which shows the valve box fixing means of the metal valve box for valves. It is a front view which shows the thermal spraying range of the metal valve box for valves. It is a schematic perspective view which shows a conventional apparatus. It is a figure which shows the metal valve box for valves, (a) is a front view, (b) is a side view.

Next, an embodiment of an apparatus for forming an anticorrosion coating on a metal valve box for a valve for carrying out the present invention will be described with reference to the drawings.

1, embodying the present invention, a plan view of a forming apparatus corrosion protective coating to a metal valve body valve, Figure 2, embodying the present invention, the formation of corrosion protective coating to a metal valve body valve The side view which shows an apparatus, FIG. 3 is a front view which shows the valve box fixing means of the metal valve box for valves.

  1 to 3, reference numeral 1 denotes a turntable. The turntable 1 is rotated via wheels 3 by the driving means 2. As shown in FIG. 3, 4 is a valve box fixing means. A plurality of valve box fixing means 4 are provided on the turntable 1 at intervals along the rotation direction of the turntable 1 (three in this example). Each of the valve box fixing means 4 is rotated about the vertical axis by the driving means 5. It is possible. The valve box fixing means 4 has a plurality of claws 6 for fixing the valve metal valve box 29 from the inside thereof, and the valve metal valve box 29 opens vertically on the turntable 1 by opening the claws 6. Fixed to. The plurality of claws 6 can be opened and closed by air supply / exhaust from an air supply / exhaust port 7.

  Reference numeral 9 denotes a robot to which the thermal spray gun 10 is attached. The robot 9 keeps the distance between the thermal spraying head 8 and the valve metal valve box 29 constant while the thermal spraying head 8 of the thermal spray gun 10 faces the valve metal valve box 29, while keeping the distance between the thermal spray gun 8 and the valve metal valve box 29 constant. 10 can be moved vertically or horizontally. From the thermal spray head 8, for example, a thermal spray material made of zinc and an aluminum-magnesium alloy is arc sprayed toward the valve metal valve box 29.

As will be described later, when the anticorrosion coating is formed on the outer surfaces of both ends of the valve metal valve box 29 including the receiving port 30, the spray gun 10 is fixed at a fixed position, and in this state, the drive means 5 The metal valve box 29 is rotated by the driving means 5 to perform the first spraying, and after the completion of the first spraying, the spraying gun 10 is moved down by one step to perform the second spraying. Further lowering is performed one step, and the third spray is performed. In this manner, the spray gun 10 is sequentially lowered step by step to spray the spray material toward the valve metal valve box 29.

On the other hand, when the anticorrosion coating is formed on the outer surface of the central portion of the valve metal valve box 29 including the flange 31, the valve metal valve box 29 is fixed in place without rotating, and the spray gun 10 is moved vertically. The first metal spraying is performed, and after the first thermal spraying is completed, the valve metal valve box 29 is rotated by a predetermined angle about the vertical axis by the driving means 5 to perform the second thermal spraying. The valve metal valve box 29 is further rotated by a predetermined angle about the vertical axis to perform the third spraying, and thus the valve metal valve box 29 is sequentially rotated by the predetermined angle about the vertical axis. Then, the thermal spray material is sprayed toward the valve metal valve box 29.

When the anticorrosion coating is formed on the outer surface of the central portion of the valve metal valve box 29 including the flange 31, the thermal spray gun 10 is horizontally applied to the valve metal valve box 29 fixed at a fixed position. Move and perform the first spraying. After completing the first spraying, lower the spray gun 10 one step and perform the second spraying, then lower the spray gun 10 one step further and perform the third spraying. In this manner, the spray gun 10 is sequentially lowered step by step to spray the spray material toward the valve metal valve box 29, and the anticorrosion coating is applied to one half of the valve metal valve box 29. Then, the valve metal valve box 29 is rotated by 180 ° about the vertical axis by the driving means 5, and the other half surface of the valve metal valve box 29 is anticorrosive in the same manner as in the case of one half surface. A film may be formed.

  11 is a dust collection booth. The dust collection booth 11 has an openable / closable door 12 that shields a part of the robot 9 and the turntable 1 together with at least one (one in this example) valve box fixing means 4. By installing the dust collection booth 11, it is possible to prevent the sprayed material that has not adhered to the valve metal valve box 29 from being scattered around, so that the working environment is improved. Further, by providing the dust collection booth 11 with the suction hood 13 connected to a suction machine (not shown), it becomes possible to collect the spray material that has not adhered to the valve metal valve box 29.

It is constructed as described above, carrying out the present invention, according to the forming apparatus corrosion protective coating to a metal valve body valve, as described below, corrosion protective coating on the entire outer surface of the metallic valve body valve Is formed automatically.

  First, as shown in FIG. 1, a valve metal valve box 29 is set on the valve box fixing means 4 at the P2 position of the turntable 1.

  Next, the door 12 of the dust collection booth 11 is opened, the turntable 1 is rotated, and the valve metal valve box 29 is moved to the P1 position in the dust collection booth 11. Thereafter, the door 12 of the dust collection booth 11 is closed. The P1 position is directly facing the robot 9. When the valve metal valve box 29 moves to the P1 position, the robot 9 directs the thermal spraying head 8 toward the upper surface of the upper receiving port 30 of the valve metal valve box 29. Then, the spraying material is sprayed while rotating the valve metal valve box 29 by the driving means 5 to form an anticorrosion coating on the upper surface of the upper receiving port 30 (see spraying range 1 in FIG. 4).

Next, the robot 9 directs the thermal spraying head 8 toward the outer surface of the upper end portion including the upper receiving port 30 of the valve metal valve box 29, and rotates the valve metal valve box 29 by the driving means 5, while the upper receiving port 30. First thermal spraying is performed on the outer surface of the upper end including In this way, when the first spraying is completed, the spray gun 10 is lowered by one step and the second spraying is performed in the same manner as the first time. Next, the spray gun 10 is further lowered one step to perform the third spray, and in this way, the spray gun 10 is sequentially lowered step by step to spray the spray material toward the valve metal valve box 29, Thus, the anticorrosion film is formed on the outer surface of the upper end portion of the valve metal valve box 29 (see the sprayed range 2 in FIG. 4).

Next, after the rotation of the valve metal valve box 29 is stopped, the robot 9 moves the thermal spray gun 10 in the vertical direction to perform the first thermal spray, and after the first thermal spray is completed, the valve metal valve The box 29 is rotated by a predetermined angle by the driving means 5 to perform the second spraying, and then the valve metal valve box 29 is further rotated by a predetermined angle around the vertical axis to perform the third spraying. In this way, the valve metal valve box 29 is sequentially rotated by a predetermined angle around the vertical axis to spray the spray material toward the valve metal valve box 29, and thus the valve metal valve box 29. An anticorrosion coating is formed on the outer surface of the central part (see sprayed range 3 in FIG. 4).

  Next, after the valve metal valve box 29 is turned upside down, the lower surface of the lower receiving port 30 of the metal valve box 29 for the valve and the lower receiving port 30 of the metal valve box 29 of the valve are made in the same manner as in the above-mentioned sprayed ranges 1 and 2. An anticorrosion coating is formed on the outer surface of the lower end (see sprayed areas 4 and 5 in FIG. 4).

In the spraying of the spraying range 3, the spraying gun 10 is moved in the horizontal direction to the metal valve box 29 for the valve fixed at a fixed position to perform the first spraying, and after the first spraying is completed, The spray gun 10 is moved down by one step and the second spraying is performed, then the spray gun 10 is further moved down by one step and the third spray is performed. In this manner, the spray gun 10 is sequentially lowered step by step. Then, the spray material is sprayed toward the valve metal valve box 29 to form an anticorrosion coating on one half of the valve metal valve box 29, and then the valve metal valve box 29 is moved by the driving means 5. The anti-corrosion film may be formed on the other half surface of the valve metal valve box 29 in the same manner as in the case of one half surface by rotating 180 ° around the vertical axis.

  As described above, the anticorrosion coating can be formed on the entire outer surface of the valve metal valve box 29.

  Thus, when spraying the thermal spraying ranges 1, 2, 4, and 5, the robot 9 keeps the distance between the thermal spraying head 8 and the valve metal valve box 29 constant, and keeps it constant for the valve. It is only necessary to rotate the metal valve box 29. When spraying the spraying range 3, the robot 9 keeps the distance between the spraying head 8 and the valve metal valve box 29 constant, Since it is only necessary to move the thermal spraying head 8 in the vertical direction or the horizontal direction, even if the shape of the valve metal valve box 29 is three-dimensional and complicated, the valve metal valve box 29 is fixed and sprayed. Compared to the above, teaching such as the operation path of the robot 9 is simplified.

  Further, since the robot 9 and the metal valve box 29 for valve spraying are shielded by the dust collection booth 11, the sprayed material that has not adhered to the valve metal valve box 29 is scattered around. As a result, the working environment is improved. Moreover, since the thermal spray material that has not adhered to the valve metal valve box 29 is collected by the suction device (not shown) through the suction hood 13, the thermal spray material that has not adhered can be recycled. .

  When the formation of the anticorrosion coating on the valve metal valve box 29 is completed in this way, the opening / closing door 12 of the dust collection booth 11 is opened, the turntable 1 is rotated, and the P1 position where the formation of the anticorrosion coating is completed. The valve metal valve box 29 is moved to the P3 position. As a result, the valve metal valve box 29 in which the formation of the anticorrosion coating has been completed is carried out of the dust collection booth 11. At the same time, since the next valve metal valve box 29 at the P2 position moves to the P1 position, an anticorrosion coating can be formed on the next valve metal valve box 29 in the same manner.

1: Turntable 2: Driving means 3: Wheels 4: Valve box fixing means 5: Driving means 6: Claw 7: Air supply / exhaust port 8: Thermal spraying head 9: Robot 10: Thermal spray gun 11: Dust collection booth 12: Open / close door 13: Suction hood 21: Straight pipe 22: Rail 23: Cart 24: Rotating roller 25: Anticorrosion coating 26: Thermal spray gun 27: Laser irradiation device 28: Pressure roller 29: Metal valve box 30 for valve 30: Receiving port 31: Valve stem mounting flange

Claims (2)

A method of forming an anticorrosion coating on the outer surface of a valve metal valve box in which a receiving port is formed at both ends and a valve rod mounting flange is formed in the center by a robot having a spray gun attached thereto, On the turntable, a plurality of valve box fixing means rotatable around a vertical axis are provided at intervals along the rotation direction of the turntable, and the valve metal valve box is provided by the valve box fixing means. When the anti-corrosion coating is formed on the outer surfaces of both end portions of the valve metal valve box including the receiving port, the valve metal valve box is rotated at a fixed position while rotating about the vertical axis. The thermal spray material is sprayed from the fixed spray gun toward the valve metal valve box to perform the first spraying. After the first spraying is completed, the spraying gun is lowered by one step to perform the second spraying. And then the spraying gas Is further lowered by one step to perform the third thermal spraying, and in this way, the thermal spray gun is sequentially lowered step by step to spray the thermal spray material toward the valve metal valve box, and includes the flange. When the anticorrosion coating is formed on the outer surface of the central portion of the valve metal valve box, the spray gun is moved in the vertical direction with respect to the valve metal valve box fixed at a fixed position. Spraying is performed, and after the first spraying is completed, the valve metal valve box is rotated by a predetermined angle around the vertical axis to perform the second spraying, and then the valve metal valve box is mounted on the vertical axis. Further, the valve is further rotated by a predetermined angle as a center, and the third spray is performed. In this manner, the valve metal valve box is sequentially rotated by a predetermined angle around the vertical axis to form the valve metal valve box. Spray the spray material toward this When the anticorrosion film is formed on the entire outer surface of the valve metal valve box, the turntable is rotated so that the next valve metal valve box faces the robot in the same manner as the previous time. Then, a method for forming an anticorrosion film on a valve metal valve box, comprising forming an anticorrosion film on the next valve metal valve box. A method of forming an anticorrosion coating on the outer surface of a valve metal valve box in which a receiving port is formed at both ends and a valve rod mounting flange is formed in the center by a robot having a spray gun attached thereto, On the turntable, a plurality of valve box fixing means rotatable around a vertical axis are provided at intervals along the rotation direction of the turntable, and the valve metal valve box is provided by the valve box fixing means. When the anti-corrosion coating is formed on the outer surfaces of both end portions of the valve metal valve box including the receiving port, the valve metal valve box is rotated at a fixed position while rotating about the vertical axis. The thermal spray material is sprayed from the fixed spray gun toward the valve metal valve box to perform the first spraying. After the first spraying is completed, the spraying gun is lowered by one step to perform the second spraying. And then the spraying gas The by further one stage down performs spraying of third, in this way, the thermal spraying gun stage by one and sequentially lower the thermal spraying of spray material towards the metal valve body for the valve, metal for the valve When forming the anticorrosion coating on the outer surface of the central portion of the valve box, the spraying gun is moved in the horizontal direction to the metal valve box for the valve fixed at a fixed position to perform the first spraying, After the completion of the first spraying, the thermal spray gun is lowered by one step to perform the second thermal spraying, and then the thermal spray gun is further lowered by one step to perform the third thermal spraying. Are sequentially lowered and sprayed with a thermal spray material toward the valve metal valve box to form the anticorrosion coating on one half of the valve metal valve box, and then the valve metal The valve box is rotated 180 ° around the vertical axis. And forming the anticorrosive film on the other half surface of the valve metal valve box in the same manner as in the case of the one half surface. .

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