JPH0621672B2 - Ball valve manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a ball valve.

(Prior Art) A conventional ball valve is generally manufactured by individually incorporating predetermined valve constituent members into a valve casing obtained by forging or casting in a desired shape in advance.

(Problems to be Solved by the Invention) The valve casing in the above conventional means is forged or cast,
Therefore, the work is a hot work, and complicated cutting work is required for molding as a secondary means, which results in a great cost burden in the manufacturing stage. Since the valves are molded by individually incorporating the individual products in a predetermined order into the proper places, the manufacturing means thereof is extremely complicated, labor-intensive and time-consuming, and consequently the product price is unavoidably high.

(Means for Solving Problems) The present invention is an improvement over the above-mentioned conventional complicated means, uses a commercially available pipe material having a simple plastic means as a valve casing, and the valve constituent members are all required members in advance. Combined and molded into a single unit,
The desired ball valve is obtained by a simple means by inserting and fixing this into a valve casing made of the above-mentioned pipe material. The pipe material is cut into a predetermined length and protrudes cylindrically on the peripheral wall of the intermediate portion. The valve housing with the built-in holes for the valve opening / closing stem unit, the valve seat ring, the O-ring, and the stop ring with the peripheral edge bent outward are positioned in that order on both sides of the ball valve body. Ball valve element and valve seat ring and O with stop ring
It consists of a valve body unit that sandwiches the ring and is integrally connected with a bolt and a nut that penetrates the ring, and a stem unit that is integrally connected with the stem to the cylindrical case, and is provided facing the assembly hole of the stem unit. The positioning sensor detects the loading position of the valve unit while pushing the valve unit into a predetermined position in the valve housing by the robot operation controlled by the adjusting device, and then tightens the bolt and nut to tighten the O-ring. After compression, the stop rings on both sides are welded to the inner surface of the valve housing at the periphery by laser or electron beam to fix the valve body unit in place in the valve housing, and then through the mounting holes of the valve housing. The lower end of the stem of the stem unit is fitted into and engaged with the recess of the ball valve body, and the case of the stem unit is welded to the cylindrical portion of the mounting hole by laser or electron beam and then operated by the robot. Connecting bolt, by disassembling the nut, characterized in that taking it from the valve housing.

(Operation) In the ball valve according to the present invention, the valve casing is connected to the pipe passage at both ends by an appropriate means, and the stem of the valve opening / closing stem unit protruding from the valve casing is rotated to rotate the ball valve. Used to open and shut the water distribution passage.

(Example) An embodiment of the method of the present invention will be described with reference to the drawings.

The present invention is formed by a combination of a valve housing A shown in FIG. 2, a valve unit B shown in FIG. 3 and a stem unit C shown in FIG.

The valve casing A is a tubular body (1) obtained by cutting a tubular material (1) having a predetermined diameter into desired dimensions.
It is provided with an assembling hole (2) for the valve opening / closing stem unit on the wall surface of the intermediate portion in the longitudinal direction, and the assembling hole (2) projects the pipe wall into a tubular shape (2a). Form.

As shown in FIG. 4, the valve body unit B includes valve seat rings (4) and (4) on both sides of a ball valve (3) provided with an engaging recess (3a) into which the lower end of the valve opening / closing stem is fitted. Further, a stop ring (6) whose outer periphery is bent through an O-ring (5) is positioned on the outer peripheral edge of the outer surface, and a bolt inserted through the center hole of each of these members.
A ball valve (3) and valve seat rings (4) on both sides of it with stop rings (6) and (6) located at both ends by (7) and nuts (8) applied to it.
(4) and O-rings (5) and (5) were sandwiched and integrally connected to form a valve unit B as shown in FIG.

In the illustrated example, washers (9) are provided at both ends when fastening the bolts (7) and nuts (8).

The stop ring (6) has a dish shape with its outer edge bent to facilitate welding with the valve casing A, which will be described later, and further, the both side valve seat ring (4) and the stop ring (6) are opposed to each other. Edge is slope (4a)
As (6a), an O-ring (5) is easily interposed between them, and the size of the stop ring (6) in the valve unit B in which the respective members are integrally connected is determined by the size of the valve casing A. It has a size that is substantially inscribed in the peripheral surface so that it can be inserted into the outer casing A,
The outer diameter of the O-ring (5) depends on the outer diameter of the stop ring (6) and the valve casing A.
The diameter was slightly larger than the inner diameter of. As shown in FIG. 5, the stem unit C has a cylindrical case (11) at the upper part of the stem (10) whose lower end is a fitting engagement end (10a) into the engagement recess (3a) of the ball valve (3). An assembling hole which is formed by being capped and integrally connected by a nut (12), and which is provided on the peripheral wall of the valve casing A with the cylindrical case (11).
The size was made to match the size of the protruding cylindrical portion (2a) forming (2).

Next, means for obtaining the ball valve by combining the valve casing A and the valve unit B, and further combining the valve unit B and the stem unit C will be described with reference to FIGS. 6 and 7. As shown in FIG. 6, the valve body unit B is gripped by the arm (13) of the robot, and this is inserted into the valve casing A. At this time, in order to confirm the charging position, a sensor (14) such as an optical sensor is opposed to the mounting hole (2) of the valve casing A to detect the position of the valve unit B, and the valve unit B is detected. When the sensor reaches a predetermined position in the valve casing A, the sensor (14) detects the detection point (15) provided at another proper place such as the center of the concave hole (3a) of the ball valve (3) of the valve unit B. When it is detected, the adjustment device (1
The movement of the robot is controlled via 6) to stop the charging operation of the valve body unit B and stabilize the valve body unit B at a fixed position.

Then, by the robot operation, the bolts and nuts (8) (9) of the valve unit B are tightened by the robot, and the O-rings (5) are compressed to seal both sides of the ball valve (3), and accordingly the O-rings. (Five)
Thus, the valve unit B is watertightly assembled in the valve casing A.
Next, the valve body unit B is fixedly fixed in the valve housing A by laser or electron beam welding (17) to the inner peripheral surface of the double-sided stop ring (6) of the valve body unit B on the inner surface of the valve housing A.

Then, in that state, as shown in FIG. 6, the assembling hole (2) of the valve casing A
After inserting the stem unit C through the above, the case (11) of the unit C is assembled with the lower engaging end (7a) of the stem (7) fitted in the recess (3a) of the ball valve (3). After welding (18) to the cylindrical part (2a) of the peripheral wall forming the hole (2) with a laser or an electron beam, the left and right robots (13) and (13) are used, and one of the robots is used. While holding the nut (8) with the arm, screw the bolt (7) with the other robot arm, disassemble the bolt (7) and nut (8) as shown by the phantom line in the figure, and take it out. As a result, the work of combining the valve casing A, the valve unit B and the stem unit C is completed, and a ball valve as shown in FIG. 1 is obtained.

(Effects of the Invention) According to the present invention, a tubular material which is easily processed and formed is cut into a predetermined size as a valve casing, and each constituent member is preliminarily supplied in a lump by bolts and nuts as a valve unit. Since the ball valve is formed by charging and fixing it in a fixed position in the valve housing and combining the stem unit, the valve components are assembled one by one to the valve housing obtained by conventional forging and casting. The valve manufacturing is much simpler than that of molding by using the robot, and the assembly of the valve body unit to the valve casing is automated by the flow work by the robot, so the work efficiency is extremely high.
Further, since the valve body unit is connected to the valve housing by laser or electron beam welding, the heat generated during welding does not cause thermal deterioration of the constituent members, especially the O-ring, and labor costs can be reduced and production costs can be reduced. Have.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a cutaway side view showing an example of a product obtained by the present invention, Fig. 2 is a cutaway side view of a valve casing, and Fig. 3 is a cutaway of a valve unit. Side view, 4th
FIG. 5 is a developed perspective view showing constituent members of the valve unit, FIG. 5 is a side view in which a part of the stem unit is cut off, and FIGS. 6 and 7 are diagrams showing the operation sequence of the method of the present invention. A ... Valve casing, B ... Valve unit, C ... Stem unit, (2) ... Assembling hole, (3) ... Ball valve, (4) ... Valve seat ring, (5) ... O-ring, (6) …… stop ring, (7) …… bolt, (8) …… nut, (10) …… stem, (11) cylindrical case, (12) …… nut, (13)… ... Robot arm, (14) ...
… Sensors, (16) …… Adjusters, (17) (18) …… Laser or electron beam welding

Claims (1)

[Claims] 1. A valve casing having a valve member formed by cutting a pipe material into a predetermined length and having a cylindrical opening projecting a stem unit for valve opening and closing in the peripheral wall of the pipe member, and valve seats on both sides of a ball valve body. ring,
Position the O-ring and the stop ring whose outer edge is bent outwards in this order, sandwich the ball valve body and valve seat ring and the O-ring with the stop rings on both sides, and integrally connect them with bolts and nuts that pass through them. The valve unit and a stem unit in which the stem is integrally connected to the cylindrical case, and the adjusting device that detects the loading position of the valve unit by the positioning sensor provided facing the mounting hole of the stem unit. The valve unit is pushed into a predetermined position in the valve housing by the robot operation controlled by, and then the bolts and nuts are further tightened to compress the O-rings. The valve unit is fixed to a fixed position in the valve housing by welding with a laser or electron beam, and then the stem lower end of the stem unit is inserted into the recess of the ball valve body through the built-in hole of the valve housing. A ball characterized by the fact that the case of the stem unit is welded to the cylindrical portion of the assembling hole with a laser or an electron beam, and then the connecting bolt and nut are disassembled by the robot operation and taken out from the valve casing. Valve manufacturing method.