JPS6152786B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting the steam temperature in a heating steam chamber in a plastic foam molding device, and the device has a simple structure and allows easy adjustment of the steam temperature. This is what we are trying to provide.

By the way, in a plastic foam molding apparatus, since the volume of the heating steam chamber is constant, the steam temperature in the chamber is directly proportional to the steam pressure. There is no difference in that a means of adjusting the steam pressure was adopted to achieve this.

First, an overview of the conventional device will be explained using the system diagram shown in FIG.

The heating steam from the heating steam source B goes through the steam supply passage y ₁ ,
The steam is supplied to the male and female heating steam chambers S ₁ and S ₂ through passages y 2 , respectively, and these passages y ₁ and y ₂ are equipped with on-off valve devices V _{1 and} V ₂ and on-off valve devices, respectively.
A pressure reducing valve device W ₁ integrated adjacent to V ₁ , V ₂ ,
W ₂ is deployed.

Since the opening/closing and depressurizing devices described above for both the male and female heating steam chambers are completely the same in structure and function, the male heating steam chamber side will be described below.

The on-off valve _V1 is connected to the heated steam source B from the pressure reducing valve device _W1 .
On the side, an opening/closing valve body is provided in the steam supply passage y ₁ and is connected to the piston D ₁ of the pneumatic device.
_v1 opens and closes the steam supply passage.

The outlet side of this on-off valve device V ₁ is the inlet side of the pressure reducing valve device W ₁ connected adjacent to this side, and the valve rod of the pressure reducing valve body W ₁ is a male threaded portion R ₁ provided on the outside of the valve box. It extends through the center of the piston Z ₁ at the tip.
is attached.

Further, a pressure regulating spring Q1 is compressed and interposed between an adjusting nut _N1 screwed onto the male threaded portion _R1 and _a seat plate _T1 attached to the valve rod.

In addition, a steam passageway with one end connected to the heating steam room S ₁
The other end of E ₁ is opened to the cylinder end face on the back side of the piston Z ₁ .

To adjust the heated steam temperature by operating the conventional device with the above structure, first, the on-off valve body v ₁ of the on-off valve device V _{1 is}
fully open, then turn the adjusting nut _N1 of the pressure reducing valve device _W1 to adjust the spring pressure of the pressure regulating spring _Q1 ,
The opening degree of the pressure reducing valve body _W1 is automatically controlled according to the pressure in the heating steam chamber _S1 to maintain the pressure in the heating steam chamber _S1 , that is, the steam temperature at a required temperature. .

That is, the heated steam passes through the steam supply passage _y1 from the heated steam source B, enters the on-off valve device _V1 as shown in _a1 , and flows between the valve opening of the pressure reducing valve device _W1 and the pressure reducing valve body _w1 as indicated by _b1. It passes through as shown in the arrow _c1 , exits from the pressure reducing valve device _W1 as shown by the arrow c1, and is supplied to the heating steam chamber _S1 as shown by the arrow _b1 .

When the steam temperature in the heating steam chamber Si decreases (that is, when the steam pressure decreases), the pressure reducing valve device W ₁ is activated through the steam passage E ₁ .
The pressure on the back side of the piston Z ₁ decreases, and the pressure regulating spring Q ₁ expands, resulting in the pressure reducing valve body w ₁
moves to the left in the figure to open the space between it and the valve seat, and a larger amount of heated steam is supplied from the opening/closing valve device V ₁ side through this opened valve opening, and the steam pressure in the heating steam chamber S ₁ is regulated. It rises until it is in equilibrium with the pressure spring Q ₁ , and the steam chamber Si
The steam temperature within is restored.

Moreover, when the pressure in the heating steam chamber S ₁ rises and the temperature rises, the pressure on the back of the piston Z ₁ rises, conversely to the above, and the pressure regulating spring Q ₁ is compressed, and as a result, the pressure reducing valve body w ₁ By narrowing the gap between the valve seats, the amount of steam supplied to the heating steam chamber _S1 is reduced, the steam pressure in the steam chamber is decreased, and the steam temperature is lowered and restored.

As mentioned above, the conventional device has two valve devices, an on-off valve device V ₁ and a pressure reducing valve device W ₁ , arranged adjacent to each other in the steam supply passage y ₁ , and a pressure reducing valve device along with this.
An adjusting nut _N1 for adjusting the opening degree of the pressure reducing valve element _W1 of _W1 is provided outside the steam supply passage forming the valve box.

Furthermore, in conventional equipment, the pressure reducing valve device
The air supply passageway _Y1 , where _W1 is installed, is installed at a position very high above the floor.

That is, the above-mentioned conventional device has a complicated structure because it includes two valve devices V ₁ and W ₁ , and the position of the adjustment nut for adjusting the opening degree of the valve body w ₁ of one pressure reducing valve device W ₁ is difficult. It was very inconvenient to adjust the valve because it was located very high above the floor.

As mentioned above, the present invention was devised for the purpose of eliminating the two drawbacks of the conventional device. (1) The pressure regulating valve device in the conventional device is removed, and a pressure regulator device is provided in its place to improve the structure. (2) By connecting the pressure reducing valve device and the pressure regulator device with a pressurized air flow pipe, the pressure regulator device can be easily installed at a desired position relative to the pressure reducing valve device. This has been improved so that pressure adjustment operations can be performed easily.

The present invention will be explained below with reference to the system diagram shown in FIG.

A steam supply passage Y ₁ for supplying heating steam from the heating steam source B to the male and female heating steam chambers S ₁ and S ₂ ,
Each of _Y2 is provided with a pressure reducing valve device _X1 , _X2 , and each of these pressure reducing valve devices _X1 , _X2 is provided with a pressure regulator device _C1 , _C2, respectively.

In addition, as described later, the pressure reducing valve devices X ₁ and X ₂
is equipped with a pressure reducing valve body that adjusts the heating steam passages Y ₁ and Y ₂ from fully open to fully closed using a pneumatic device.

The pneumatic device for operating the pressure reducing valve devices X ₁ and X ₂ includes a filter F from a pressurized air source A, a pressure reducing valve V having a pressure gauge G, and an oiler L.
Pressurized air is supplied from the inlet side A through the pressurized air distribution pipe U and U ₁ and U ₂ . The pressurized air outlet side B of the pneumatic device is
The pressure regulator devices C ₁ and C ₂ are connected to the inlet side C of the pneumatic device by pressurized air distribution pipes K ₁ and K ₂ .

Furthermore, each pressure regulator device C ₁ , C ₂ has a pressure gauge G ₁ ,
G ₂ , and the steam pressure in the heated steam chambers _{S 1} , S ₂ is transferred from the steam passages P 1 , P ₂ to each pressure regulator device C ₁ , C ₂ via one end of the passages P ₁ , P ₂ . It is designed to be communicated to.

As shown in the figure, electromagnetic valves M ₁ and M ₂ are provided in each of the pressurized air flow passages U ₁ and U ₂ , respectively.

Due to the structure described above, in the present invention, the structure related to the valve device is simplified by providing only one pressure reducing valve device X ₁ , X ₂ , and coordination with the pressure reducing valve device X ₁ , X ₂ is simplified. Since the pressure device devices C ₁ and C ₂ are connected to each other by pressurized air distribution pipes K ₁ and K ₂ , the pressure regulator device C can be connected to the pressure reduction valve device by piping the communication gaps K ₁ and K ₂ as required. ₁ and _C2 can be installed at desired positions for easy operation, completely eliminating the inconveniences associated with conventional devices.

Next, an example of each embodiment of the pressure reducing valve devices X ₁ and X ₂ in FIG. 3 and the pressure regulator devices C ₁ and C ₂ in FIG. 4 will be described.

In FIG. 3, referring to the pressure reducing valve devices X ₁ and X ₂ , the heating steam source B and the male and female heating steam chambers S ₁ ,
S ₂ is communicated with steam passages Y ₁ and Y ₂ , and a pressure reducing valve body 1 is provided in these passages Y ₁ and Y ₂ to adjust the passage from fully open to fully closed.

From the heating steam source B, heating steam flows through the valve openings as indicated by arrows a, b and c and is supplied to the heating steam chambers S ₁ and S ₂ .

A piston 3 is provided on the pressure reducing valve body 1 via a piston rod 2, and a pressure regulating spring 4 is provided above the piston so as to oppose the air pressure of a pneumatic device acting on the lower side of the piston.

A pressurized air inlet 6 and a pressurized air outlet 7 of the pneumatic device are provided on the cylindrical wall of the cylinder 5 in which the piston 3 is fitted, respectively, and a pressurized air distribution pipe U connected to the pressurized air source A is provided. The inlet side _A of the ends of the pressurized air distribution pipes K1 and K2 are connected to the pressurized air inlet 6, and the pressurized air outlet 7 is connected to the outlet side of the pressurized air distribution pipes _{K1 and K2} . Ro has been contacted.

On the other hand _, referring to _the pressure regulator devices _{C 1} and C ₂ in FIG _. act.

An interlocking rod 13 is supported in an upright position at the center of the pressure-sensitive membrane plate 8, and the upper end of the interlocking rod 13 is connected to the actuating piece 1.
A rotating support shaft 14 is supported horizontally by a support bolt 15 on one side (left side in the figure) of 0, and the actuating piece 10 can move up and down on the other side (right side in the figure) with the rotation support shaft 14 as an axis. It's becoming like that.

Further, a pressure regulating spring 9 whose spring pressure can be adjusted by an adjusting bolt 12 is installed on the upper surface of the actuating piece 10 so as to counteract the movement of the pressure sensitive membrane plate 8.

Note that the ends C of the pressurized air distribution pipes K ₁ and K ₂ mentioned above are connected to the pressurized air distribution hole 16, and the opening/closing valve body 11 is connected to the bent opening end of the pressurized air distribution hole.
(The illustrated one is a spherical valve), and this opening/closing valve body 11 is pressed from above by the vertically movable side portion of the actuating piece 10 mentioned above.

In addition, 17 shown in the figure is a heating steam vent and a pressure gauge.
It is connected to C ₁ , C ₂ , and the heating steam passage P ₁ ,
The steam pressure in the heating steam chambers S ₁ and S ₂ is displayed on the pressure gauges G ₁ and G ₂ through the gap in the lower surface of the pressure-sensitive membrane plate 8 through P ₂ .

The following describes how the pressure reducing valve devices X ₁ and X ₂ and the pressure regulator devices C ₁ and C ₂ operate in conjunction with each other.

First, the spring pressure of the pressure regulating spring 9 is set to the required value using the adjusting bolt 12 of the pressure regulator device C ₁ , C ₂ , while the spring pressure of the pressure regulating spring 4 of the pressure reducing valve device X ₁ , X ₂ is set to the pressure reducing valve body 1 . Since the required opening degree for the valve seat is pre-selected, when the steam temperature (i.e. steam pressure) in the heating steam chambers S ₁ and S ₂ rises above the set required temperature (i.e. the steam pressure When the pressure sensitive membrane plates 8 of the pressure regulator devices C ₁ and C ₂ are lifted upward, the interlocking rod 13 is also pushed upward, and as a result, the actuating piece 10 rotates around the rotation support shaft 14. It rotates counterclockwise against the pressure regulating spring 9.

Therefore, the on-off valve body 11 is released from the pressing action from above by the actuating piece 10.

On the other hand, from the pressurized air source A to the pressurized air distribution pipe U ₁ ,
The pressurized air that passes through U ₂ and first flows into and out of the pressure reducing valve devices X ₁ and X ₂ as shown by the arrows, flows through the pressurized air distribution pipes K ₁ and
The pressurized air flows into the pressure regulator devices C ₁ and C ₂ via K ₂ , but this pressurized air pushes up the open/close valve body 11 which is in a free state above the open end of the pressurized air circulation hole 16 and is ejected into the atmosphere.

Therefore, the pressure of the pressurized air in the pressure reducing valve devices X ₁ and X ₂ decreases, and as a result, the pressure regulating spring 4 expands and pushes the piston 3 downward, and as a result, the opening/closing valve body 1 descends toward the valve seat. The valve opening becomes narrower and heating steam source B
The amount of heating steam supplied to the heating steam chambers S ₁ and S ₂ decreases, thus the amount of heating steam in the heating steam chambers decreases, and as a result, the steam temperature decreases.

Conversely, when the steam temperature in the heating steam chambers S ₁ , S ₂ decreases (that is, when the steam pressure in the heating steam chambers S ₁ , S ₂ decreases), the pressure regulating springs 9 of the pressure regulator devices C ₁ , C ₂ presses the actuating piece 10 toward the pressure-sensitive membrane plate 8, and as a result, the actuating piece 10 presses the opening/closing valve body 11 located on the open end of the pressurized air circulation hole 16 from above, and releases the pressurized air into the atmosphere. Spillage inside is completely stopped. As a result, the air pressure below _{the pistons 3 of the pressure reducing valve devices X 1 ,} A larger amount of heating steam is supplied from the spreading heating steam source B to the heating steam chambers S ₁ and S ₂ .

That is, the steam pressure in the heating steam chambers S ₁ and S ₂ increases, and therefore the heating steam temperature increases.

As described above, although the above-described embodiment of the present invention has a simple structure, it is possible to provide a heating steam temperature control device that operates smoothly and reliably and has good functionality.

[Brief explanation of the drawing]

FIG. 1 is an overall system diagram of a conventional device. 2 to 4 show an embodiment of the device of the present invention, FIG. 2 is a system diagram of the entire device, and FIGS. 3 and 4 each show an example of the embodiment, including a pressure reducing valve device and FIG. 3 is an enlarged cross-sectional view of both main device parts of the pressure regulator device. In the drawings, A...pressurized air source, B...heated steam source, _y1 , _y2 , _Y1 , _Y2 ...steam supply passage, _S1 , _S2 ...
…Male, female heating steam chamber, V ₁ , V ₂ … Opening/closing valve device,
W ₁ , W ₂ , X ₁ , X ₂ ... pressure reducing valve device, C ₁ , C ₂ ... pressure regulator device, F ... filter, V ... pressure reducing valve, L
... Euler, U ₁ , U ₂ , K ₁ , K ₂ ... Pressurized air distribution pipe, P ₁ , P ₂ , E ₁ , E ₂ ... Steam passage, M ₁ , M ₂ ...
...Solenoid valve, w ₁ , w ₂ ... Pressure reducing valve body, Q ₁ , Q ₂ ...
Pressure regulating spring, R ₁ , R ₂ ... Male thread part, N ₁ , N ₂ ... Adjustment nut, v ₁ , v ₂ ... Opening/closing valve body, D ₁ , D ₂ , Z ₁ , Z ₂
... Piston, a ₁ , a ₂ , b ₁ , b ₂ , c ₁ , c ₂ , d ₁ ,
d ₂ , a, b, c...steam distribution route, T ₁ , T ₂ ...
Seat plate, 1... Valve body for pressure reduction, 2... Piston rod, 3... Piston, 4, 9... Pressure regulating spring, 5...
... Cylinder, 6 ... Pressurized air inlet, 7 ... Pressurized air outlet, 8 ... Pressure sensitive membrane plate, 10 ... Actuation piece, 11 ... Opening/closing valve body, 12 ... Pressure regulating bolt, 1
3... Interlocking rod, 14... Rotation support shaft, 15... Support bolt, 16... Pressurized air circulation hole.

Claims (1)

[Claims] 1. During foam molding of raw materials, each of the steam supply passages to the male and female heating steam chambers surrounding the outside of the molding chamber is controlled by a pneumatic device from fully open to fully closed. For each of these pressure reducing valve devices, a pneumatic device of the pressure reducing valve device is installed in accordance with the steam pressure of the heating steam chamber. a pressure regulator device having a pneumatic device configured to flow out pressurized air from the pressure reducing valve device; A feature is that the outlet holes for pressurized air to the provided pneumatic device are communicated with each other, so that the pressure regulator device can be installed at a desired position for easy operation with respect to the pressure reducing valve device. Temperature control device for raw material heating steam in plastic foam molding equipment. 2. A pneumatic device of a pressure reducing valve device includes a piston connected to a pressure reducing valve body and restrained by an adjustment spring, and a cylinder having an outlet hole for pressurized air in a cylinder wall and fitting the piston, On the other hand, the pneumatic device of the pressure regulator device is restrained by an actuating piece interposed between a pressure-sensitive membrane plate that receives steam pressure in a heating steam chamber and a pressure regulating spring facing this pressure-sensitive plate, and this actuating piece. 2. A temperature control device for raw material heating steam in a plastic foam molding apparatus according to claim 1, further comprising an on-off valve body configured to always close an outlet hole for pressurized air.