JPS633763Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a hot plate for hot-pressing plate bodies such as plywood, laminated materials, and resin laminates in a hot press.

The hot plate used to heat and press the plate is usually made of a thick steel plate with a certain degree of rigidity in order to maintain its straightness, depending on the vertical and horizontal dimensions, and this thick steel plate is heated with steam, hot oil, etc. In order to form a passage for circulating the heating medium, a plurality of holes are perforated at regular intervals in the length and width of the hole, and then the holes are fixed with a stopper rod.

For this reason, the hot plate has to be overweight compared to its original purpose, and its production requires special equipment and skilled techniques, which increases the time and cost of production. Become.

In addition, in a hot press in which hot plates of this kind are arranged in multiple stages in the vertical direction, not only does the press equipment become oversized to support the excess weight of the hot plates themselves, but also the heat plates arranged in multiple stages The disadvantage was that the power required to raise and lower the board increased the burden.

Furthermore, the plate after being heated and pressed is likely to suffer from poor adhesion due to variations in the pressing force. The cause of this poor adhesion is firstly that the plate itself is somewhat thick and thin, and secondly, the fact that a plurality of ram cylinders are disposed in the press device is also a contributing cause. In other words, since the same driving source is used to supply oil to each ram cylinder, a slight time difference is required for each ram to rise, and the movable plate attached to each ram is raised at a slight incline. This is because it is inevitable. Furthermore, a sliding guide that slides on a sliding plate attached to the movable platen side of the press column is arranged on the outer side of the movable platen, but the contact state between each sliding guide and the sliding plate is Since the movement is not uniform, the movable platen has no choice but to rise in a slightly inclined state depending on the magnitude of the sliding resistance. Therefore, the pressing force per unit area of the plate body pressed in this inclined state will vary.

The above-mentioned tendency is currently being exacerbated by the overweight of the hot plate and the increase in the number of stages, and the difference in pressing force between the upper stage and the lower stage is secondary to this. To solve this problem, parallel lifting can be achieved by installing a simultaneous clamping device that synchronously compresses, closes, and opens while supporting the weight of each hot plate, but the hot plate itself does not maintain a certain straightness. Due to its mechanism, it cannot cope with the thickness of the plate, and variations in pressing force still occur.

In view of the above, the present invention adopts a pair of flat metal plates as the material of the heating plate to reduce the weight, and arranges equipment in a staggered manner between the metal plates to form a passage for the heating medium. The structure is such that it can expand to follow the thickness of the plate and apply a predetermined pressure when the plate is heated and compressed.An example of the structure will be described below with reference to the accompanying drawings.

The hot plate 1 is made of a pair of metal plates 2, 2', such as a relatively thin steel plate or an aluminum plate with an anodized surface. Place it opposite to the
A plurality of pieces of equipment 3 are arranged parallel to each other in a staggered manner at appropriate intervals between the metal plates 2 and 2'.

Since the hot plate 1 usually has a rectangular shape with different vertical and horizontal dimensions, the above-mentioned equipment 3 is placed parallel to its vertical side 4.
When arranging the equipment 3, as shown in FIG. 1, the length is shorter than the vertical side 4, and conversely, when arranging the equipment 3 parallel to the horizontal side 5, as shown in FIG. The equipment 3 is shorter than the horizontal side 5, and is shorter than at least one side of the metal plates 2, 2',
A gap is formed to ensure an inflow passage.

Next, one of the upper and lower surfaces of the equipment 3 is welded to the opposing metal plates 2, 2' (in the embodiment, the lower metal plate 2'), and the other is used as a free end.
Just let them touch each other. At this time, the even corner portion of the equipment 3 which becomes the free end shall be formed in advance into a curved shape.

Furthermore, after bending the four peripheral edges of the metal plates 2 and 2', welding is performed to close them (see Figure 3), or a partition having the same height as that between the metal plates 2 and 2' is formed. The plate 6 is welded to its four peripheral edges to form a closed state. (See Figure 4) At one end between the closed metal plates 2 and 2',
A supply port 7 for supplying a heating medium such as hot oil or steam,
A discharge port 8 is installed at the other end, and the equipment 3 arranged in a staggered manner forms a passage 9 through which the heating medium circulates.

FIG. 5 is a circuit diagram assuming that the heating medium is hot oil, from the oil tank 10 to the pump 11.
The hot oil pumped up through the pipe 12 is supplied from the supply port 7 to the passage 9 in the hot plate 1,
Further, a relief valve 16 is connected to the pipe 13 connected to the discharge port 8, which returns hot oil having a pressure higher than a set pressure to the oil tank 10 when the stop valve 15 of the branch pipe 14 is shut off.

In addition, when using steam, a boiler shall be installed in place of the oil tank 10.

Next, the multi-stage hot press 17 to which the hot plate 1 is normally mounted will be briefly described with reference to FIG.

The hot press 17 has an upper frame 19 and a lower frame 20 that are vertically opposed to each other via a support 18, and a cylinder 21 installed on the lower frame 20.
It has a movable platen 23 that is raised and lowered by a ram 22. The lower part of the upper frame 19 and the movable platen 23
The uppermost and lowermost heating plates 1 are fixed to the upper part of the heating plate 1, and a plurality of intermediate heating plates 1 are arranged at appropriate intervals between the heating plates 1, and claw members (not shown) are arranged between the heating plates 1. Supported through.

In addition, 24 in the figure shows a plate body.

Next, the hot plate 1 of the present invention is placed in a multi-stage hot press 1.
7 will be explained below.

Each hot plate 1 has its thickness uniformly regulated by the equipment 3 and is given a certain degree of rigidity, and its free end is connected to one of the metal plates 2, 2' (in the embodiment, the upper metal It is in contact with plate 2).

In this state, the bottom and middle hot plates 1
After inserting and placing the plates 24 on all stages at once through an upward push block or other plate 24 insertion device (not shown), when the cylinder 21 is actuated to raise the ram 22, the movable platen 23 is moved upward. The plate body 24 that has risen and is placed on the lowest heating plate 1 is placed on the middle heating plate 1.
is raised sequentially to reach the upper limit.

When reaching the upper limit, the plate body 24 comes into close contact between the lowermost, intermediate, and uppermost hot plates 1, and at this point, the operation of the cylinder 21 is temporarily stopped and the current position is maintained.

Next, after shutting off the stop valve 15 and instructing the relief valve 16 to apply a predetermined pressure to the plate 24 to be clamped, the heating medium is supplied from the supply port 7 via the pump 11 to the passage inside the hot plate 1. 9, a predetermined pressure is generated.

At this time, since one of the metal plates 2 and 2' of the hot plate 1 is simply in contact with the free end of the equipment 3, the hot plate 1 becomes expandable and heated by following the thickness of the plate 24. Clamping can be performed.

After the heat-pressing is completed, the stop valve 15 is released to release the pressure, and the cylinder 21 is activated to lower the ram 22 to complete the bonding of the plates 24.

As described above, the heat plate of the present invention is not only easier to manufacture and process than the conventional heat plate, but also has a reduced weight, and since one of the components constituting the passage is a free end, By supplying heating medium,
By generating pressure at any time, it is possible to expand to follow the thickness of the plate, thereby eliminating problems such as poor adhesion.

For this reason, when the hot plate of the present invention is attached to a hot press, the press equipment becomes smaller due to the lighter weight of the hot plate, and the ram cylinder has a lower amount of work to raise and lower as well as maintain the pressure generated on the hot plate. The required power can be sufficiently reduced, and since the surface of the hot plate is made of a metal plate, sliding intervention between the hot plates, such as a push block, will not be hindered.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view showing one embodiment of the hot plate of the present invention, Fig. 2 is a partially cutaway plan view showing another embodiment of the same, and Fig. 3 is a partially cutaway plan view showing the same embodiment. 4 is a partially cutaway side view showing another embodiment, FIG. 5 is a circuit diagram for supplying and discharging the heating medium to the hot plate, FIG. 6 is a front view of the hot press, and FIG. 7 is a side view showing another embodiment. FIG. 3 is an explanatory diagram showing heat-pressing of the same plate body. 1...Hot plate, 2,2'...Metal plate, 3...Materials,
6... Partition plate, 7... Supply port, 8... Discharge port, 9
... Passage, 16 ... Relief valve, 17 ... Hot press.

Claims (1)

[Scope of utility model registration request] Between a pair of metal plates facing each other at a certain height, a plurality of pieces of equipment shorter than one side of the metal plate are arranged in a staggered pattern at appropriate intervals, and either the top or bottom of the pieces is placed relative to each other. Furthermore, the four peripheral edges of the pair of metal plates are bent or welded through a partition plate having a certain height to form a closed shape, and a supply port and a supply port are formed between the closed metal plates. A hot plate for a hot press, characterized in that a discharge port is installed to supply and discharge a heating medium to a passage formed by the above-mentioned equipment.