JP6744772B2 - Liner processing equipment - Google Patents

Description

The present invention relates to a liner processing device.

Patent Document 1 discloses a pressure vessel having a liner made of synthetic resin. The liner has a substantially cylindrical main body part having both ends in the axial direction reduced in diameter, and a cylindrical projecting part formed to project at an end part in the axial direction of the main body part. The outer peripheral surface of the cylindrical protruding portion is a sealing surface to which a seal member provided on the inner periphery of the retainer is brought into close contact.

JP, 2005-132307, A

The liner is manufactured by blow molding. In blow molding, since the sealing surface of the cylindrical protrusion is formed by a pair of dies that are opened in the radial direction, an axial parting line remains on the sealing surface. Conventionally, in order to erase the parting line, the sealing surface was cut, but there was a problem that the cutting accuracy was low. A polishing method using a buff is also available as a means for improving the processing accuracy, but the polishing processing using the buff has a problem that it takes a long time.

The present invention has been completed based on the above circumstances, and an object thereof is to smoothly form the sealing surface of the liner.

The present invention is
A liner processing device for processing a liner made of a synthetic resin that constitutes a pressure container, in which a cylindrical projecting portion is projected from a main body portion having a fluid storage space inside,
A molding jig having a molding surface fitted to the sealing surface of the tubular protrusion;
Heating means for heating the sealing surface via the molding jig,
It is characterized in that it is provided with a cooling means for cooling the sealing surface via the molding jig.

According to this configuration, when the molding surface of the molding jig is fitted to the sealing surface of the cylindrical protrusion and the sealing surface is heated by the heating means through the molding jig, the sealing surface fits into the molding surface. It is plastically deformed and formed into a smooth surface with low surface roughness. After heating, when the sealing surface is cooled by the cooling means via the molding jig, the sealing surface is solidified in a smooth state. According to the present invention, the sealing surface can be finished more smoothly than by cutting.

A partially omitted sectional view showing a state in which the liner of Example 1 is set in a holder of a processing apparatus. Partial cross-sectional view showing a state in which the sealing surface is heated by the heating means. XX line sectional view of FIG. Partial cross-sectional view showing a state in which the sealing surface is being cooled by the cooling means. 2-4 Y-Y line sectional view Partially omitted cross-sectional view showing the state where the mouthpiece is attached to the processed cylindrical protrusion

In the present invention, the heating means may be a heating unit that is attachable to and detachable from the molding jig. According to this configuration, after the sealing surface is heated and molded, the heating unit is removed from the molding jig, whereby the time required for cooling the molding jig and the sealing surface can be shortened.

The present invention may include an accommodation space that is formed inside the molding jig and accommodates a heater that constitutes the heating unit. According to this configuration, the contact area between the heater and the molding jig or the facing area can be ensured to be wider than in the case where the heater is arranged on the outer surface of the molding jig, so that the heating efficiency is improved.

According to the present invention, the cooling means is disposed outside the molding jig and a cooling passage formed inside the molding jig, and supplies and discharges a cooling fluid to and from the cooling passage. A supply/discharge unit may be provided. According to this configuration, the contact area between the cooling fluid and the molding jig can be secured to be wider than that in the case where the cooling flow path is routed along the outer surface of the molding jig, so that the cooling efficiency can be improved.

In the present invention, the supply/discharge unit may be detachable from the molding jig. According to this configuration, if the water supply/drainage unit is removed from the molding jig while the sealing surface is heated, the temperature rise of the water supply/drainage unit can be avoided, so that the time required for cooling the molding jig and the sealing surface can be shortened. be able to.

<Example 1>
A first embodiment embodying the present invention will be described below with reference to FIGS. In the following description, with respect to the vertical direction, the directions shown in FIGS. Regarding the left and right directions, the directions shown in FIGS. 1 to 6 are defined as left and right. Regarding the front-back direction, the upper side in FIGS. 3 and 5 is defined as the front.

The liner A, which is a processing target of the processing apparatus 20 for liner of the first embodiment, has a main body portion 10 having a fluid storage space 15 for storing a high-pressure fluid therein. The main body portion 10 includes a body portion 11 having a substantially cylindrical shape with its axis oriented in the up-down direction, and dome portions 12 formed at both ends of the body portion 11 in the axial direction. From the dome portion 12 on the upper side, a cylindrical protruding portion 13 having a substantially cylindrical shape is coaxially protruded upward (outward). From the lower dome portion 12, a closed end portion 14 having a substantially cylindrical shape projects coaxially downward (outward).

The cylindrical protrusion 13 connects the inside and the outside of the liner A. The closed end 14 separates the inside and the outside of the liner A. The region of the outer surface of the liner A excluding the cylindrical protrusion 13 is covered with an outer layer body (not shown) made of carbon fiber reinforced plastic (CFRP) or the like. The liner A and the outer layer body constitute a pressure vessel 19 together with a base 17 described later.

The liner A is molded into the above shape by a blow molding machine (not shown). From the blow molding machine, a cylindrical parison (not shown) made of a resin material such as a mixed resin of high-density polyethylene (HDPE) and ethylene/vinyl alcohol copolymer resin (EVOH), which is the material of the liner A, has an axis line. It is pushed downward in the vertical direction. The extruded parison is arranged between a pair of front and rear molds (not shown) that are opened in the horizontal direction (radial direction of the parison).

At this time, inside the parison, a metal rod 21 with its axis oriented in the vertical direction, a metal backup ring 23 screwed into the male threaded portion 22 at the upper end of the rod 21, and a lower end of the rod 21. A holding metal fitting 24 attached to the male screw portion 22 of the portion by screwing is arranged coaxially with the parison. The rod 21 constitutes the liner processing device 20. The backup ring 23 and the holding fitting 24 constitute the liner processing device 20 and the pressure vessel 19.

The pair of molds are closed, and pressurized air is supplied into the parison through an air supply passage (not shown) formed in the rod 21. Then, the outer surface of the parison is pressed against the mold, and the liner A having the above shape is molded. That is, the main body portion 10, the cylindrical protruding portion 13, and the closed end portion 14 are molded into a predetermined shape. At this time, the backup ring 23 is fixed to the inner peripheral surface of the cylindrical protruding portion 13, and the holding metal fitting 24 is fixed to the inner surface of the closed end portion 14. The molded liner A is cooled until it solidifies and its shape becomes stable.

On the outer surface of the liner A after molding, a pair of left and right parting lines resulting from molding by a pair of front and rear molds is formed. Since the outer peripheral surface of the cylindrical protruding portion 13 is the seal surface 16 with which the seal ring 18 provided on the inner peripheral surface of the mouthpiece 17 is in close contact, the fact that a parting line remains on the seal surface 16 causes deterioration of the sealing performance. Therefore, it is necessary to perform processing to erase the parting line. Conventionally, a method of smoothing the sealing surface 16 by cutting may be adopted, but the cutting method increases the surface roughness. Further, in order to reduce the surface roughness, polishing with a buff may be performed, but polishing with the buff takes a long time.

In the present embodiment, as a means for solving the problem of cutting work and forming the sealing surface 16 of the cylindrical protruding portion 13 of the liner A into a smooth curved surface having a small surface roughness in a short time, a liner processing device is used. 20 is used. The liner processing device 20 includes a molding jig 25, a heating means 35, and a cooling means 39 in addition to the rod 21, the backup ring 23, and the holding metal fitting 24.

The molding jig 25 is made of a material having a high thermal conductivity such as metal and has a block shape as a whole. In the molding jig 25, a molding hole 26 whose axis is oriented in the vertical direction is formed in a vertically penetrating form. The opening shape of the molding hole 26 (the shape viewed at right angles to the axis) is circular. The inner peripheral surface of the molding hole 26 is a molding surface 27 that is continuous over the entire circumference. The inner diameter of the molding surface 27 is the same as the outer diameter of the sealing surface 16 of the tubular protrusion 13. Further, the outer diameter of the sealing surface 16 in the state of being molded by the mold is set to be slightly larger than the inner diameter of the molding surface 27.

The molding jig 25 is formed with a pair of left and right housing spaces 28 that are open on the upper surface thereof. The pair of accommodating spaces 28 are arranged and shaped symmetrically with respect to the axis of the molding hole 26. The pair of accommodation spaces 28 are arranged so as to face the parting line on the outer peripheral surface of the cylindrical protrusion 13 in the circumferential direction. That is, the pair of accommodation spaces 28 are arranged so as to sandwich the molding hole 26 from both left and right sides. The heater 38 of the heating means 35 is housed in the housing space 28.

Inside the molding jig 25, a cooling flow path 29 forming a cooling means 39 is formed. The cooling flow path 29 has a substantially U shape in a plan view, and has an upstream-side flow path 30 in the left-right direction and a turning flow path 31 in the front-rear direction that is continuous with the downstream end (left end portion) of the upstream-side flow path 30. , And a downstream flow passage 32 in the left-right direction that is continuous with the downstream end (rear end) of the turning flow passage 31.

The upstream flow path 30 is arranged in a region in front of the molding hole 26 and the left and right housing spaces 28. The upstream end (right end) of the upstream flow path 30 is opened as a water supply port 33 on the outer right surface of the molding jig 25. The turning flow path 31 is arranged on the left side of the accommodation space 28 on the left side. The downstream flow path 32 is arranged in a region behind the molding hole 26 and the left and right housing spaces 28. The downstream end (right end) of the downstream flow path 32 is opened as a drainage port 34 on the right outer surface of the molding jig 25.

As shown in FIG. 2, the heating means 35 is composed of a heating unit 36 that can be attached to and detached from the molding jig 25. The heating unit 36 includes a base member 37 having a flat plate shape, and a pair of left and right heaters 38 protruding from the lower surface of the base member 37. The heater 38 heats the material of the liner A to a temperature at which it can be softened or melted.

The heating unit 36 is configured to move between a heating position (see FIG. 2) and a standby position (not shown) by a driving mechanism (not shown). When the heating unit 36 is in the heating position, the base member 37 is placed on the upper surface of the molding jig 25, and the pair of heaters 38 are housed in the pair of housing spaces 28. When the heating unit 36 is in the standby position, the base member 37 is separated from the upper surface of the molding jig 25, and the pair of heaters 38 are located outside the accommodation space 28.

As shown in FIG. 4, the cooling means 39 is configured to include the cooling flow path 29 formed in the molding jig 25 and the supply/discharge unit 40. The water supply/drainage unit 40 is configured to include a flat plate-shaped support member 41, a joint member 43 separate from the support member 41, a water supply hose 47, and a drain hose 48. A guide rail 42 that is long in the left-right direction is formed at the right end of the lower surface of the support member 41. A guide groove 44 in the left-right direction into which the guide rail 42 is fitted is formed at the upper end of the joint member 43. The joint member 43 is slidably in contact with the guide rail 42 by a drive mechanism (not shown), and is a support member between a connection position (see FIGS. 4 and 5) and a separation position (not shown) to the right of the connection position. It is configured to be able to move relative to 41 in the left-right direction.

Inside the joint member 43, a horizontal water supply hole 45 and a horizontal water discharge hole 46 are formed. The water supply hole 45 is arranged at the front end portion of the joint member 43 so as to correspond to the upstream flow path 30. The drain hole 46 is arranged at the rear end of the joint member 43 so as to correspond to the downstream flow path 32. A downstream end of a water supply hose 47 is fixed (connected) to the upstream end (right end) of the water supply hole 45 in a communicating state. An upstream end of the drain hose 48 is fixed (connected) in a communicating state to a downstream end (right end) of the drain hole 46. The water supply hose 47 and the drain hose 48 move together with the joint member 43.

The supply/discharge unit 40 is configured to move between a cooling position (see FIG. 4) and a standby position (not shown) by a drive mechanism (not shown). When the supply/discharge unit 40 is in the cooling position, the support member 41 is placed on the upper surface of the molding jig 25, and the joint member 43 is located to the right of the molding jig 25. At this time, if the joint member 43 is at the connection position, the downstream end (left end) of the water supply hole 45 is connected to the upstream end of the upstream flow path 30 (cooling flow path 29), and the upstream end of the drain hole 46. The (left end portion) is connected to the downstream end of the downstream flow passage 32 (cooling flow passage 29). When the joint member 43 is at the separated position, the water supply hole 45 is separated from the cooling flow path 29 (upstream side flow path 30) and the drain hole 46 is separated from the cooling flow path 29 (downstream side flow path 32).

Next, a process of molding the sealing surface 16 of the cylindrical protrusion 13 will be described. The liner A, which is molded by a mold and solidified in a state where it is integrated with the rod 21, the backup ring 23, and the holding metal fitting 24, is set in the holder 49 with its axis oriented in the vertical direction, as shown in FIG. Is positioned. Thereafter, as shown in FIGS. 2 to 5, the molding jig 25 is attached to the liner A. At this time, at this time, the molding hole 26 is fitted onto the cylindrical protrusion 13 so that a large clearance is not formed between the molding surface 27 and the sealing surface 16.

After that, as shown in FIGS. 22 and 3, the heating unit 36 is moved to the heating position and assembled to the molding jig 25. As a result, the base member 37 is placed on the upper surface of the molding jig 25, and the pair of heaters 38 is housed in the housing space 28. At this time, the front, rear, left, and right outer surfaces and the bottom surface (lower surface) of the heater 38 are in contact with or close to the inner surface of the accommodation space 28 to face each other. After moving the heating unit 36 to the heating position, the temperature of the heater 38 is increased. Then, the heat of the heater 38 is transferred to the inner surface of the accommodation space 28, moves inside the molding jig 25, and is transferred from the molding surface 27 to the sealing surface 16.

As a result, the sealing surface 16, in particular, the left and right side surface portions where the parting line is formed is heated to be in a softened or melted state, and the molding surface 27 is closely adhered to the molding surface 27 without leaving a gap. To be done. As a result, the parting line disappears, and the sealing surface 16 is processed so as to have a smooth curved surface without extreme irregularities or steps in the circumferential direction. After heating and molding the sealing surface 16 as described above, the heating unit 36 is moved to the retracted position, and the heater 38 is detached from the molding jig 25.

After that, while the molding jig 25 is still fitted to the cylindrical protruding portion 13, the feeding/discharging unit 40 is moved to the cooling position as shown in FIG. Place on top. Next, the joint member 43 is translated from the detached position to the connected position. As a result, the water supply hole 45 of the joint member 43 is connected to the upstream end of the cooling flow path 29, and the drain hole 46 is connected to the downstream end of the cooling flow path 29. When the connection is completed, cooling water (cooling fluid) is supplied to the molding jig 25 side.

The cooling water flows in one direction in a path that passes through the water supply hose 47, the water supply hole 45, the upstream flow path 30, the turning flow path 31, the downstream flow path 32, the drain hole 46, and the drain hose 48 in order. Since the cooling water removes heat from the cylindrical protruding portion 13 (sealing surface 16) and the molding jig 25, the temperatures of the sealing surface 16 and the cylindrical protruding portion 13 decrease, and the sealing surface 16 adheres to the molding surface 27. Then, it solidifies while maintaining the state of being molded into a smooth curved surface. After the sealing surface 16 is solidified, the joint member 43 is slid to the disengagement position, and then the strong drainage unit is moved to the standby position.

When the feeding/discharging unit 40 is removed from the molding jig 25, the molding jig 25 is moved upward and separated from the cylindrical protrusion 13. Then, by rotating the rod 21, the upper and lower male screw portions 22 are removed from the backup ring 23 and the holding metal fitting 24, and are pulled out above the liner A. The backup ring 23 and the holding metal fitting 24 remain in the state of being integrated with the liner A and function as components of the pressure vessel 19. After removing the rod 21 from the liner A, the mouthpiece 17 is fitted on the outer circumference of the cylindrical protruding portion 13, and the seal ring 18 provided on the inner circumference of the mouthpiece 17 is brought into close contact with the sealing surface 16. As a result, the gap between the outer circumference of the cylindrical protrusion 13 and the inner circumference of the base 17 is hermetically sealed.

As described above, the liner processing device 20 of the present embodiment has a form in which the cylindrical protruding portion 13 protrudes from the main body portion 10 having the fluid storage space 15 inside, and is made of a synthetic resin that constitutes the pressure vessel 19. This is a device for applying processing to the liner A. This liner processing device 20 includes a molding jig 25 having a molding surface 27 fitted to the sealing surface 16 of the cylindrical protrusion 13, and a sealing surface 16 (cylindrical surface) via the molding jig 25 (molding surface 27). The heating means 35 for heating the cylindrical projection 13) and the cooling means 39 for cooling the sealing surface 16 (cylindrical projection 13) via the molding jig 25 (molding surface 27) are provided.

According to this configuration, the molding surface 27 of the molding jig 25 is fitted to the sealing surface 16 of the cylindrical protruding portion 13, and the sealing surface 16 is heated by the heating means 35 via the molding jig 25 (molding surface 27). Then, the sealing surface 16 is plastically deformed so as to fit the molding surface 27, and is molded into a smooth surface having low surface roughness. After heating, when the sealing surface 16 is cooled by the cooling means 39 via the molding jig 25 (molding surface 27), the sealing surface 16 is solidified in a smooth state. According to the present invention, the sealing surface 16 can be finished more smoothly than by cutting. In addition, the time required for processing is shorter than polishing processing by buffing.

The heating means 35 is a heating unit 36 that can be attached to and detached from the molding jig 25. Therefore, if the heating unit 36 is removed from the molding jig 25 immediately after the step of heating and molding the sealing surface 16 is completed, the heat of the heater 38 is applied to the sealing surface 16 and the molding jig 25 more than necessary. It doesn't have to be transmitted. By doing so, the time required to cool the molding jig 25 and the sealing surface 16 after heating can be shortened.

Further, inside the molding jig 25, an accommodation space 28 for accommodating the heater 38 constituting the heating unit 36 is formed. The front surface, the rear surface, the left and right side surfaces, and the bottom surface of the heater 38 are all closely facing or in contact with the inner surface of the housing space 28 (that is, the molding jig 25). According to this configuration, as compared with the case where the heater 38 is arranged along the outer surface of the molding jig 25, it is possible to secure a wider contact area or facing area between the heater 38 and the molding jig 25. The amount of heat transferred to the molding jig 25 increases, and the heating efficiency is high.

The cooling means 39 includes a cooling flow path 29 formed inside the molding jig 25, and a supply/discharge unit 40 arranged outside the molding jig 25. Supplies and discharges cooling water (cooling fluid) to and from the cooling channel 29. Compared with the case where the cooling flow path 29 is installed along the outer surface of the molding jig 25, the cooling flow path 29 formed inside the molding jig 25 is shaped with cooling water (cooling fluid). Since a large contact area with the jig 25 can be secured, cooling efficiency can be improved.

Further, since the feeding/discharging unit 40 is attachable/detachable to/from the molding jig 25, the feeding/discharging unit 40 can be removed from the molding jig 25 while the sealing surface 16 is heated. It is possible to prevent the temperature of the unit 40 from rising. In this way, in the cooling step after heating, the time required to cool the molding jig 25 and the sealing surface 16 can be shortened.

<Other Examples>
The present invention is not limited to the embodiments described by the above description and the drawings, and the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, only the outer circumference of the cylindrical protrusion is the sealing surface, but the present invention is directed to the case where only the inner circumference of the cylindrical protrusion is the sealing surface, and It can also be applied to the case where both the outer circumference and the inner circumference are sealing surfaces.
(2) In the above embodiment, the heater is housed inside the molding jig, but the heater may be arranged on the outer surface of the molding jig.
(3) In the above embodiment, the heating means (heating unit) is attachable to and detachable from the molding jig, but the heating means may remain integrated with the molding jig.
(4) In the above embodiment, the supply/discharge unit of the cooling means is attachable/detachable to/from the molding jig, but the supply/discharge unit may remain integrated with the molding jig.
(5) In the above-described embodiment, the cooling fluid passages are formed inside the molding jig, but the cooling fluid cooling passages may be arranged along the outer surface of the molding jig. Good.
(6) In the above embodiment, the cooling fluid is a liquid, but the cooling fluid may be a gas.
(7) In the above embodiment, the heater is arranged only at two positions corresponding to the parting line of the cylindrical protruding portion, but the heater is arranged so as to correspond to the entire circumference of the cylindrical protruding portion. Good.

A... Liner 10... Main body 13... Cylindrical protrusion 15... Fluid storage space 16... Sealing surface 19... Pressure vessel 20... Liner processing device 25... Molding jig 27... Molding surface 28... Housing space 29... Cooling flow Path 35... Heating means 36... Heating unit 38... Heater 39... Cooling means 40... Supply/discharge unit

Claims (5)

A liner processing device for processing a liner made of a synthetic resin that constitutes a pressure container, in which a cylindrical projecting portion is projected from a main body portion having a fluid storage space inside,
A molding jig having a molding surface fitted to the sealing surface of the tubular protrusion;
Heating means for heating the sealing surface via the molding jig,
A liner processing apparatus comprising: a cooling unit that cools the sealing surface via the molding jig. The liner processing apparatus according to claim 1, wherein the heating means is a heating unit that is detachable from the molding jig. The liner processing apparatus according to claim 2, further comprising an accommodation space formed inside the molding jig and accommodating a heater that constitutes the heating unit. The cooling means is arranged outside the molding jig and a cooling flow path formed inside the molding jig, and supplies and discharges a cooling fluid to and from the cooling flow path. The liner processing apparatus according to any one of claims 1 to 3, further comprising: The liner processing apparatus according to claim 4, wherein the supply/discharge unit is attachable to and detachable from the molding jig.

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