JP2014151349A - Continuous hot press apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous hot press apparatus in which metal belts are efficiently heated in a short period of time and furthermore uniformly heated, thereby temperature difference in the metal belts is reduced.SOLUTION: The continuous hot press apparatus includes: a pair of pressurization heads 1 including pressurization chambers 10 into which pressurized fluid is supplied; a pair of endless metal belts 2 which are disposed opposite to the pressurization heads 1; a transport mechanism for moving the metal belts 2; and heating mechanisms 3 for heating the metal belts 2. The heating mechanism 3 are equipped with exciting coils 31 and high frequency power sources 32 which are disposed in the pressurization chambers 10. The metal belt 2 comprises an induction heating metal which generates heat by a high frequency magnetic field of the exciting coil 31. In the continuous hot press apparatus, the exciting coils 31 perform induction heating of the metal belts 2 by a high frequency power supplied from the high frequency power sources 32, the metal belts 2 heated by the pressurized fluid transport an article to be pressed 20 in heated and pressured state. A magnetic plate 35 is disposed on the metal belt 2 side of the exciting coil 31 in the pressurization chamber 10.

Description

  The present invention relates to a continuous hot press apparatus in which a pressed object is sandwiched from above and below by an endless metal belt, and the pressed object is heated and pressurized by a metal belt, and in particular, a pressure head is disposed on the back side of the metal belt. The metal belt is disposed so as to close the opening of the pressurization chamber provided in the pressurization head, and the pressurizing fluid is supplied to the pressurization chamber so that the pressed object is heated by the metal belt. Further, the present invention relates to a continuous hot press apparatus that sandwiches and transfers in a pressurized state.

A continuous hot press apparatus has been developed in which a pressed object is sandwiched from above and below by a pair of endless metal belts, and the pressed object is transferred while heated by a metal belt. (See Patent Document 1)
As shown in FIGS. 1 and 2, this continuous hot press apparatus is provided with a pair of pressure heads 101 arranged to face each other, and a pressurized fluid 111 is applied to a press surface 101 a of the pressure head 101. Is provided with a pressurized chamber 110 for supplying the pressure. The pressurizing chamber 110 is provided with a metal belt 102 so as to open a surface facing the opposing pressure head 101 and close the opening. In this press apparatus, in a state where the metal belt 102 closes the pressurizing chamber 110, oil heated as the pressurizing fluid 111 is supplied to the pressurizing chamber 110 in a pressurized state. 120 is transferred while heating and pressurizing.

  The press device of Patent Document 1 shown in FIGS. 1 and 2 heats oil that is a pressurized fluid 111 to heat the metal belt 102, and presses the object to be pressed 120 while heating the heated metal belt 102. . Since the continuous hot press apparatus having this structure heats the metal belt 102 through oil, there is a drawback that it takes a very long time to restart after stopping the apparatus. This is because it takes time to stop the apparatus and heat the oil whose temperature has decreased to several hundred degrees. In addition, there is a drawback in that extremely large heat energy is required until the oil is heated to a set temperature. For example, in a continuous hot press apparatus using 800 liters of oil, heating the oil temperature to about 400 ° C. requires as long as about 3 hours.

  The shortening of the start time can be eliminated by providing a metal plate in the vicinity of the belt, inductively heating it, and heating the pressed object with the heated metal plate, as disclosed in Patent Document 2, for example. In this apparatus, as shown in FIG. 3, a heating plate 201 heated by electromagnetic induction is disposed outside the belt 202, and the pressed object is heated by the heating plate 201 via the belt 202.

JP 2007-105783 A JP-A-8-209426 JP 2010-274295 A

  As shown in FIG. 3, the structure in which the belt 202 is heated by the heating plate 201 and the pressed object is heated by the heated belt 202 cannot effectively heat the pressed object by using the heat energy of the heating plate 201. There are drawbacks. In addition, a device that arranges a pressure head outside the belt, supplies a pressurized fluid to a pressure chamber provided in the pressure head, and pressurizes the belt with the pressure of the pressurized fluid pressurizes the heating plate. Although it is necessary to arrange in the chamber, the heating plate arranged here conducts heat to the oil of the pressurized fluid, so the belt is heated to the correct set temperature unless the pressurized fluid is heated to the set temperature. There is a disadvantage that cannot be done.

  In order to solve the above disadvantages, the present inventor arranges an exciting coil 331 inside the pressurizing chamber 310 so as to face the back surface of the metal belt 302 as shown in FIG. A continuous hot press apparatus in which high frequency power is supplied to the excitation coil 331 and the metal belt 302 is induction-heated by the excitation coil 331 has been developed. (See Patent Document 3)

  In the above continuous hot press apparatus, the metal belt 302 is heated by induction heating with the exciting coil 331. Therefore, an apparatus for heating the metal belt with a pressurized fluid or a heating plate disposed outside the metal belt is heated. The metal belt can be heated efficiently in a short time as compared with the apparatus. For this reason, there exists the characteristic which can carry out induction heating of a metal belt efficiently. However, the above apparatus has a drawback that it is difficult to uniformly heat the metal belt, temperature unevenness occurs in the metal belt, and the whole pressed object cannot be heated and pressed in an ideal state. Although the temperature unevenness of the metal belt can be reduced by adjusting the shape and arrangement of the exciting coil, it is extremely difficult to uniformly heat the metal belt.

  The present invention has been developed for the purpose of solving the above-described drawbacks. An important object of the present invention is to uniformly heat the metal belt in a short time and to uniformly heat the metal belt. An object of the present invention is to provide a continuous hot press apparatus capable of reducing the difference.

Means for Solving the Problems and Effects of the Invention

  The continuous hot press apparatus of the present invention includes a first pressurizing head 1 </ b> A including a pressurizing chamber 10 that is disposed to face each other and that has openings on opposing faces and to which a pressurized fluid 11 is supplied. And a pair of pressure heads 1 including the second pressure head 1B and the pressure head 10 can be moved relative to the pressure head 1 in a state where the opening of the pressure chamber 10 provided in the pressure head 1 is closed. A pair of endless metal belts 2 arranged to face each other, a transfer mechanism 4 for moving the metal belt 2, and a heating mechanism 3 for heating the metal belt 2 are provided. The heating mechanism 3 includes an excitation coil 31 disposed inside the pressurizing chamber 10 so as to face the back surface of the metal belt 2, and a high-frequency power source 32 that supplies high-frequency power to the excitation coil 31. Yes. The metal belt 2 is a metal belt made of induction heating metal that generates heat due to the high frequency magnetic field of the exciting coil 31, and closes the opening of the pressurizing chamber 10 so as to move relative to the exciting coil 31. In the continuous hot press apparatus, the exciting coil 31 induction-heats the metal belt 2 with high-frequency power supplied from a high-frequency power supply 32, and the metal belt 2 pressurized with the pressurized fluid 11 heats and pressurizes the pressed object 20. Transport in state. Further, the continuous hot press apparatus has a magnetic plate 35 disposed in the pressurizing chamber 10 on the metal belt 2 side of the exciting coil 31.

  The above-described continuous hot press apparatus has a feature that the temperature difference can be reduced by uniformly heating the metal belt while efficiently heating the metal belt in a short time. This is a continuous hot press device in which an excitation coil is arranged in a pressurization chamber of a pressurization head so that a metal belt is an induction heating metal that generates heat by a high frequency magnetic field. This is because the magnetic plate is disposed on the metal belt side. This continuous hot press machine directly heats the metal belt that presses the object to be pressed by induction heating so that the metal belt can be heated efficiently in a short time, while the magnetic plate is interposed between the excitation coil and the metal belt. By arranging, the strength of the magnetic flux density of the metal belt can be controlled to reduce the temperature difference of the metal belt. The magnetic plate disposed between the exciting coil and the metal belt shields a high-frequency magnetic field formed around the exciting coil to reduce the magnetic flux density induced in the metal belt. Therefore, in this continuous hot press apparatus, in a region where the temperature of the metal belt is high, a magnetic plate is disposed between the exciting coil and the metal belt, thereby reducing the amount of heat generated in this region and the temperature difference of the metal belt. And the temperature distribution can be made uniform.

  In the continuous hot press apparatus of the present invention, the magnetic plate 35 can be made of a magnetic metal. Moreover, the continuous hot press apparatus of this invention can make the magnetic plate 35 into a ferrite.

In the continuous hot press apparatus of the present invention, a part or the whole of the magnetic plate 35 can be either a porous plate 35 </ b> A having a plurality of through holes 36 or a mesh material.
This continuous hot press apparatus can easily control the magnetic shield action of the magnetic plate by adjusting the size and number of through holes provided in the magnetic plate or the size of the mesh. For this reason, this continuous hot press apparatus can control the magnetic shielding action of the magnetic plate to make the temperature of the metal belt more uniform.

In the continuous hot press apparatus of the present invention, the magnetic plate 35 can be disposed at the center of the metal belt 2.
In this continuous hot press apparatus, since the magnetic plate is disposed in the central portion of the metal belt that generates the largest amount of heat without the magnetic plate being disposed, the magnetic flux density in the central portion of the metal belt is reduced and induction heated metal The temperature rise of the belt can be made uniform.

In the continuous hot press apparatus of the present invention, the pressurizing head 1 is made of metal, and the shield plate 37 can be disposed on the back surface of the exciting coil 31 in the pressurizing chamber 10 of the pressurizing head 1.
This continuous hot press device shields the high frequency magnetic field of the exciting coil with a shield plate arranged on the back of the exciting coil, and is effective for induction heating of the metal pressure head by the AC magnetic flux generated by the exciting coil. Can be prevented. Since this structure can prevent the pressure head from generating heat, the heat utilization efficiency can be prevented from being lowered by the heat radiation of the pressure head to the outside.

  In the continuous hot press apparatus of the present invention, the shield plate 37 can be made of magnetic metal or ferrite.

It is a schematic longitudinal cross-sectional view of the conventional press apparatus. FIG. 2 is an enlarged cross-sectional view of the press device shown in FIG. 1. It is a schematic longitudinal cross-sectional view of the other conventional press apparatus. It is an expanded sectional view which shows the pressurization head part of the continuous hot press apparatus which this inventor developed previously. It is a schematic block diagram of the continuous hot press apparatus concerning one Example of this invention. It is a side view which shows the pressurization head part of the continuous hot press apparatus shown in FIG. It is a top view which shows the pressurization head part of the continuous hot press apparatus shown in FIG. It is the VIII-VIII sectional view taken on the line which shows the pressurization head part of the continuous hot press apparatus shown in FIG. It is a partially expanded schematic sectional drawing which shows the pressurization head part of the continuous hot press apparatus shown in FIG. It is a schematic sectional drawing which shows the pressurization head part of the continuous hot press apparatus shown in FIG. 5, Comprising: It is a figure corresponded in the XX sectional view of FIG. It is a schematic sectional drawing which shows the state by which alternating current magnetic flux permeate | transmits a metal belt with the high frequency magnetic field which generate | occur | produces from the exciting coil of the conventional continuous hot press apparatus. It is a schematic sectional drawing which shows the state by which alternating current magnetic flux permeate | transmits a metal belt with the high frequency magnetic field generate | occur | produced from an excitation coil in the state which has arrange | positioned the magnetic plate between the excitation coil and the metal belt. It is a schematic sectional drawing which shows the pressurization head part of the continuous hot press apparatus which concerns on the other Example of this invention. It is a schematic sectional drawing which shows the preheater of the continuous hot press apparatus shown in FIG. It is an expanded sectional view which shows the pressurization head for cooling of the continuous hot press apparatus shown in FIG. It is an expanded sectional view which shows the thickness adjustment mechanism of the press apparatus shown in FIG. It is the partial cross section perspective view which expanded and decomposed | disassembled the principal part of the thickness adjustment mechanism shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment shown below exemplifies a continuous hot press apparatus for embodying the technical idea of the present invention, and the present invention does not specify the continuous hot press apparatus as follows. Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  5 to 10 show a continuous hot press apparatus that presses a sheet-like workpiece 20 like a rubber sheet. The continuous hot press apparatus shown in these drawings includes a pair of pressure heads 1 including a first pressure head 1 </ b> A and a second pressure head 1 </ b> B disposed so as to be opposed to each other vertically, and the pressure head 1. A pair of endless metal belts 2 disposed opposite to each other so as to be able to move relative to the pressure head 1 in a state in which the opening of the pressure chamber 10 provided in the cylinder is closed, and the metal belt 2, a transfer mechanism 4 that moves the metal belt 2, a heating mechanism 3 that heats the metal belt 2, a reciprocating mechanism 8 that reciprocates the pair of pressure heads 1 toward and away from each other, and a first pressure head A thickness adjusting mechanism 7 is provided that connects 1A and the second pressure head 1B so that the distance between the press surfaces 1a in the pressed state can be adjusted.

  The pair of pressure heads 1 presses the pressed object 20 with the pressing surface 1a facing each other. In the continuous hot press apparatus shown in the figure, the pressure heads 1 are arranged at the top and bottom. In the figure, the upper pressure head 1 is a first pressure head 1A, and the lower pressure head 1 is a second pressure head 1B. However, the upper pressure head can be used as the second pressure head, and the lower pressure head can be used as the first pressure head. Moreover, the continuous hot press apparatus of this invention does not necessarily need to arrange | position a pair of pressurization head up and down.

  As shown in the enlarged sectional views of FIGS. 9 and 10, the pressurizing head 1 is provided with a pressurizing chamber 10 for supplying a pressurizing fluid 11 to the press surface 1a. The pressurizing chamber 10 has a metal belt 2 disposed so as to open a surface facing the opposing pressure head 1 and close the opening.

  The metal belt 2 is a belt made of induction heating metal that generates heat by the high frequency magnetic field of the exciting coil 31. As the metal belt 2 to be induction-heated, a martensitic stainless steel or a philite stainless steel, which is a Cr-based stainless steel, can be used, and a cold-worked Cr-Ni austenitic stainless steel belt is used. . For the metal belt 2, SUS403 stainless steel excellent in high stress and heat resistance is preferably used.

  However, as the metal belt, stainless steel such as SUS410, SUS410S, SUS410J1, SUS416, SUS420J1, SUS420J2, SUS420F, SUS429J1, SUS431, SUS440A, SUS440B, SUS440C, and SUS440F can be used in addition to SUS403. Further, as phylite-based stainless steel, SUS4xx-based stainless steel such as SUS405, SUS410L, SUS429, SUS430, SUS430F, SUS430LX, SUS434, SUS436L, SUS444, and SUS447J1, and stainless steel such as SUSXXM27 can also be used. Further, as cold-worked austenitic stainless steel, SUS304, the most commonly used stainless steel, SUS301 that can be made high strength by cold working, and stainless steel that improves cold workability by adding Cu to SUS304. And stainless steel such as SUS3xx and SUS2xx can be used.

  Furthermore, the metal belt 2 can also use a clad material containing a metal to be induction-heated. At least one layer of the clad metal belt is made of martensitic stainless steel, philite stainless steel, or cold-worked austenitic stainless steel. Furthermore, the metal belt made of the clad material can be made of stainless steel as the surface layer and clad material of iron or iron alloy as the inner layer. Since the metal belt is induction-heated in the inner layer, the surface stainless steel layer is not induction-heated, that is, a non-magnetic stainless steel, for example, an austenitic stainless steel such as Cr-Ni-based stainless steel, that is, an 18-8-based stainless steel. Stainless steel can also be used.

  As shown in FIGS. 9 and 10, the pressurizing head 1 is provided with a metal belt 2 on the press surface 1 a and presses the object to be pressed 20 between the upper and lower metal belts 2. The pressurizing head 1 is provided with a peripheral wall 13 around it, and the inside of the peripheral wall 13 serves as a pressurizing chamber 10. The peripheral wall 13 is provided with a concave groove 15 for inserting the packing 14 on the contact surface with the metal belt 2. The packing 14 placed in the concave groove 15 is in close contact with the surface of the metal belt 2 in a pressed state, and seals the pressurizing chamber 10.

  A pair of endless metal belts 2 disposed between the pressure heads 1 and above and below the pressed object 20 are moved by the transfer mechanism 4. As shown in FIG. 5, the transfer mechanism 4 includes a pair of rolls 41 disposed at both ends of the continuous hot press apparatus and on which the metal belt 2 is hung, and a rotation mechanism (not shown) that rotates these rolls 41. And. The transfer mechanism 4 rotates the upper and lower rolls 41 to move the pair of endless metal belts 2 arranged in the upper and lower directions together in the same direction. The pair of endless metal belts 2 disposed above and below is moved in the same direction while sandwiching a workpiece such as a rubber sheet as the pressed object 20. The endless metal belt 2 hung on the roll 41 is disposed on the surface opposite to the press surface 1 a of the pressure head 1. The endless metal belt 2 is stopped in a state where the workpiece of the pressed object 20 is pressed, and when the workpiece such as a rubber sheet of the pressed object 20 is carried into the press surface 1a or the vulcanized rubber sheet is discharged. Moved together.

  The continuous hot press apparatus shown in FIG. 5 is arranged in the direction in which the metal belt 2 is moved, and the pressure head 1 for heating and the pressure for cooling that cools the pressed object 20 that has been heated by passing through the pressure head. And a head 5. A heating mechanism 3 is provided so that the pressure head 1 for heating sandwiches a pair of metal belts 2 and heats the pressed object 20 with the metal belt 2.

  As shown in FIGS. 9 and 10, the heating mechanism 3 includes an excitation coil 31 disposed inside the pressurizing chamber 10 so as to face the back surface of the metal belt 2, and a high-frequency power supplied to the excitation coil 31. And a high frequency power supply 32 for supplying the power. The exciting coil 31 is fixed to the pressure head 1, and the metal belt 2 is moved relative to the pressure head 1. Therefore, the excitation coil 31 is configured so that the metal belt 2 and the excitation coil 31 can move relative to each other, that is, the metal belt 2 moves relative to the excitation coil 31 and closes the opening of the pressurizing chamber 10. 31 is fixed to the pressure head 1.

  A magnetic plate 35 is disposed in the pressurizing chamber 10 on the metal belt 2 side of the exciting coil 31. The exciting coil 31 approaches the metal belt 2 and efficiently heats the metal belt 2 by induction. The exciting coil 31 is a planar coil, and the magnetic plate 35 can be disposed between the exciting coil 31 and the metal belt 2, and is disposed as close to the back surface of the metal belt 2 as possible.

  The high frequency power supply 32 supplies high frequency power to the exciting coil 31 to perform induction heating. In order for the high frequency power supply 32 to heat the metal belt 2 to a set temperature, the high frequency power supply 32 includes a temperature sensor 33 for the metal belt 2. The high frequency power supply 32 controls the high frequency power supplied to the metal belt 2 at the temperature detected by the temperature sensor 33 to keep the metal belt 2 at a set temperature. The output of the high-frequency power source 32 connected to the exciting coil 31 of the pressurizing chamber 10 is set to an optimum value in consideration of the size and thickness of the metal belt 2, but is set to, for example, 1 kW to several tens kW. . The heating time of the metal belt 2 can be shortened by increasing the output of the high-frequency power source 32. For this reason, the output of the high frequency power supply 32 is set to an optimum value in consideration of the heating time of the metal belt 2, the heat capacity of the metal belt 2, and the heat capacity of the pressed object 20. Moreover, the frequency of the high frequency power supply 32 is set to 20 kHz to 100 MHz. When the frequency of the high-frequency power supply increases, it is necessary to use a high-speed element for the element used for the high-frequency power supply, which increases the cost of power transistors such as FETs and MOSFETs. Inductive heating is difficult, and low frequency noise increases. Therefore, the frequency of the high frequency power supply is preferably 100 kHz to 10 MHz.

  The high frequency power supply 32 compares the detected temperature of the temperature sensor 33 with the set temperature, controls on / off the high frequency power output to the excitation coil 31, or supplies the excitation coil 31 with a temperature difference between the detected temperature and the set temperature. The magnitude | size of electric power is controlled and the metal belt 2 is heated to preset temperature. The set temperature of the metal belt 2 is not constant depending on the pressed object 20 heated in a pressurized state, and is set to, for example, 150 ° C. to 500 ° C. For example, in a continuous hot press apparatus used for rubber sheet vulcanization, the set temperature of the metal belt 2 is about 200 ° C.

  The magnetic plate 35 is disposed between the exciting coil 31 and the metal belt 2 in order to reduce the temperature difference between the metal belts 2. The temperature distribution of the metal belt 2 is specified by the shape of the exciting coil 31 and the position where it is arranged. The heat generation amount of the metal belt 2 that generates heat by the high frequency magnetic field of the exciting coil 31 is large in a region where the magnetic flux density induced by the exciting coil 31 is high, and is small in a region where the magnetic flux density is low. The magnetic plate 35 is disposed between the exciting coil 31 and the metal belt 2 and controls the strength of the magnetic flux density of the metal belt 2. The region of the metal belt 2 in which the magnetic plate 35 is disposed between the exciting coil 31 is magnetically shielded by the magnetic plate 35 and the magnetic flux density becomes weak. Therefore, the continuous hot press apparatus arranges the magnetic plate 35 between the region where the temperature of the metal belt 2 becomes high and the exciting coil 31, thereby reducing the amount of heat generated in this region and the temperature difference of the metal belt 2. , Ie, uniform temperature distribution.

  The exciting coil 31 generates a high frequency magnetic field around the exciting high frequency current. The AC magnetic flux is transmitted through the metal belt 2 by the high frequency magnetic field. The cross-sectional view of FIG. 11 shows the alternating magnetic flux generated around the exciting coil 31 with a chain line. The metal belt 2 is an induction heating metal that is arranged in a high frequency magnetic field and generates heat. The exciting coil 31 generates an alternating magnetic flux around it in proportion to the current. An eddy current flows through the metal belt 2 by this AC magnetic flux. The eddy current generates Joule heat to heat the metal belt 2. The calorific value of the metal belt 2 is large in the alternating magnetic flux density, that is, in the high magnetic flux density region, and is small in the low magnetic flux density region. The magnetic flux density of the metal belt 2 is high in the vicinity of the excitation coil 31 and decreases as the distance from the excitation coil 31 increases. The metal belt 2 shown in the cross-sectional view of FIG. 11 is separated from the exciting coil 31 in the side region, and the magnetic flux density becomes low and the temperature becomes low. That is, the magnetic flux density is increased by approaching the exciting coil 31 at the center of the metal belt 2, and the temperature is increased.

  In the cross-sectional view of FIG. 12, the magnetic plate 35 is disposed between the exciting coil 31 and the metal belt 2. The magnetic plate 35 is disposed close to a specific region of the metal belt 2 where the magnetic flux density by the exciting coil 31 is increased. The magnetic plate 35 magnetically shields the high frequency magnetic field of the exciting coil 31 and reduces the magnetic flux density of the metal belt 2. With this structure, the metal belt 2 has a reduced magnetic flux density in a region where the magnetic plate 35 is disposed between the metal coil 2 and the heat generation amount due to Joule heat. That is, the temperature rise can be reduced by arranging the magnetic plate 35 between the excitation coil 31 and the specific region of the metal belt 2 where the temperature is high when the magnetic plate 35 is not arranged. The magnetic plate 35 can reduce the temperature rise in the region where the temperature of the metal belt 2 is high. Therefore, the temperature difference of the metal belt 2 can be reduced by disposing the magnetic plate 35 between the exciting coil 31 and the region where the temperature increases without the magnetic plate 35 being disposed.

  The magnetic plate 35 is a metal plate made of a magnetic metal. This metal plate is a metal plate having a high magnetic permeability such as iron, pure iron, silicon steel, directional silicon steel, and permalloy. Since the metal plate is conductive, it is excited by the alternating magnetic field of the exciting coil 31 to cause an eddy current to flow and generate heat due to Joule heat caused by the current. Therefore, the magnetic plate 35 of the metal plate itself generates heat to heat the pressurized fluid 11 in the pressurized chamber 10 and to heat the metal belt 2 through the heated pressurized fluid 11. In particular, pure iron has a smaller specific resistance than silicon steel, permalloy or the like, and can increase the amount of heat generated by Joule heat to heat the pressurized fluid 11. As the magnetic plate 35, a plate-like or sheet-like ferrite can be used instead of the metal plate.

  The magnetic plate 35 can be a perforated plate 35A having a plurality of through holes 36 or a net member. The magnetic plate 35 can be provided with a plurality of through holes 36 in a part or the whole region, or can be a net material. The perforated plate 35A can be provided with a circular, polygonal, or slit-shaped through hole to reduce the magnetic shielding effect. The perforated plate 35A can more effectively reduce the magnetic shield action by providing a large number of large through holes. The mesh material can increase the mesh size and reduce the magnetic shielding effect more effectively. The magnetic plate 35 can use a perforated plate 35 </ b> A or a net material to control the magnetic shield action and make the temperature of the metal belt 2 more uniform. This is because the magnetic flux density of the metal belt 2 can be controlled by the degree to which the magnetic plate 35 magnetically shields.

  For example, as shown in the cross-sectional view of FIG. 9, the magnetic plate 35 can be disposed at the center of the metal belt 2 that generates the largest amount of heat without the magnetic plate 35 being disposed. This structure magnetically shields the high-frequency magnetic field of the exciting coil 31 facing the central part of the metal plate 2 to reduce the magnetic flux density in the central part of the metal belt 2 and to reduce the amount of heat generated by Joule heat. Further, the temperature of the metal belt 2 can be made uniform without disposing the magnetic plate 35 on both sides where the heat generation amount is small.

  Further, as shown in the sectional view of FIG. 13, the magnetic plate 35 is a metal having no through hole between the excitation coil 31 and the central portion of the metal belt 2 that generates the largest amount of heat when the magnetic plate 35 is not disposed. A plate 35B is disposed, and a porous plate 35A provided with a plurality of through holes 36 is provided on the outer side of the central portion of the metal belt 2 that generates a smaller amount of heat than the center portion but larger than both sides. By reducing the magnetic shielding effect, the temperature difference of the metal belt 2 can be further reduced.

  The above embodiment shows a specific example in which the heat generation amount on both sides of the metal belt 2 is small by the excitation coil 31, but the metal belt 2 does not necessarily have a low temperature only on both sides. Depending on the shape and arrangement of 31, the temperature of the metal belt 2 is partially increased or decreased. Therefore, a magnetic plate 35 is arranged between the region where the temperature of the metal belt 2 is increased and the exciting coil 31, and the metal belt 2. The temperature difference between 2 can be reduced.

  The metal pressure head 1 has a high magnetic permeability, and the AC magnetic flux generated by the exciting coil 31 is transmitted to generate heat by Joule heat. The pressurizing head 1 that generates heat dissipates heat to the outside to reduce heat utilization efficiency. The apparatus shown in FIGS. 9, 10, and 13 limits the amount of heat generated by the pressure head 1 by arranging a shield plate 37 in the pressure chamber 10 on the back surface of the exciting coil 31. The shield plate 37 shown in the figure is disposed on the entire back surface of the excitation coil 31 to magnetically shield the pressure head 1 from the excitation coil 31. In the pressure head 1 magnetically shielded by the shield plate 37, the magnetic flux density decreases and the heat generation amount decreases.

  As with the magnetic plate 35, the shield plate 37 is a metal plate having a high magnetic permeability. The metal shield plate 37 generates heat and heats the pressurized fluid 11. The continuous hot press apparatus of FIG. 9 supplies the pressurized fluid 11 to the center part of the shield plate 37 that generates heat. The pressurized fluid 11 supplied here is heated by the shield plate 37 and the temperature rises to heat the metal belt 2. The illustrated shield plate 37 has a plurality of through holes 38. The shield plate 37 having the through hole 38 allows the pressurized fluid 11 to pass through the through hole 38 and causes the pressurized fluid 11 to flow on both sides thereof. The pressurized fluid 11 flowing between the shield plate 37 and the excitation coil 31 is heated by both the shield plate 37 and the excitation coil 31. The exciting coil 31 generates heat by the Joule heat of the flowing current and heats the pressurized fluid 11. The through hole 38 of the shield plate 37 is adjusted to a size that does not lower the magnetic shield. The through hole 38 of the shield plate 37 is made sufficiently small with respect to the wavelength of the high frequency magnetic field of the exciting coil 31 so that the magnetic shield action is not lowered.

  In the continuous hot press apparatus of FIG. 9, the pressurized fluid 11 supplied to the central portion of the pressurizing chamber 10 is transmitted through the central portion of the exciting coil 31 and supplied between the exciting coil 31 and the metal belt 2. . The pressurized fluid 11 supplied here passes through the through holes 36 provided in the magnetic plate 35, flows on both surfaces of the magnetic plate 35, and flows from the center to both sides. The pressurized fluid 11 flowing on both surfaces of the magnetic plate 35 is heated by the magnetic plate 35 and heats the metal belt 2. The pressurized fluid 11 that heats the metal belt 2 and flows on both sides of the metal belt 2 is discharged to the outside from both sides of the pressurized chamber 10.

  The continuous hot press apparatus shown in FIGS. 5 and 14 includes a preheater 6 that preheats the metal belt 2 transferred to the opening of the pressurizing chamber 10. In this apparatus, the metal belt 2 preheated by the preheater 6 is transferred to the opening of the pressurizing chamber 10 and is further induction-heated to a set temperature by the exciting coil 31 provided in the pressurizing chamber 10. Furthermore, the continuous hot press apparatus of the present invention is provided with a plurality of pre-heating machines 6 in the transfer direction of the metal belt 2 to gradually increase the temperature of the metal belt 2, thereby preventing thermal distortion of the metal belt 2. Heat to set temperature. This continuous hot press apparatus is a preheating machine in which the heating temperature of the metal belt 2 of the preheating machine 6 arranged on the side approaching the pressurizing chamber 10 is arranged on the side away from the pressurizing chamber 10. The temperature of the metal belt 2 is gradually increased by making the temperature higher than the heating temperature of the metal belt 2.

  The continuous hot press apparatus shown in FIGS. 5 and 15 is provided with a three-stage preheater 6 to heat the metal belt 2 to 400 ° C. by gradually increasing the temperature. The first stage preheater 6A of this apparatus heats the metal belt 2 cooled by passing through the pressure head 5 for cooling to 150 ° C. The second stage preheater 6B heats the metal belt 2 heated by the first stage preheater 6A to 250 ° C. The third stage preheating machine 6C heats the metal belt 2 heated by the second stage preheating machine 6B to 350 ° C. Finally, the heating mechanism 3 provided in the pressure head 1 heats the temperature of the metal belt 2 to 400 ° C.

  Similar to the heating mechanism 3 that heats the metal belt 2 in the pressurizing chamber 10, the preheating machine 6 includes a preheating excitation coil 61 disposed opposite to the metal belt 2, and the preheating excitation coil 61. And a preheating power source 62 for supplying high frequency power to the power source. The first-stage preheater 6A and the second-stage preheater 6B shown in FIG. 15 have the preheat excitation coil 61 opposed to the surface of the metal belt 2 along the outer periphery of the roll 41 of the transfer mechanism 4. Arranged. The third stage preheater 6C is located between the pressure head 1 and the roll 41 formed by arranging the first stage preheater 6A and the second stage preheater 6B. A preheating excitation coil 61 is arranged opposite to the back surface of 2. As in the heating mechanism 3 described above, the preheating machine 6 detects the temperature of the metal belt 2 to be heated by the temperature sensor 63, and the preheating power source 62 is set so that the temperature of the metal belt 2 becomes the set temperature. The power supplied to the preheating excitation coil 61 is controlled to control the metal belt 2 to the set temperature. The continuous hot press apparatus of FIG. 15 uses an exciting coil and a high frequency power source for the preheater 6, but an infrared heater or the like can also be used for the preheater.

  As shown in FIGS. 5 and 16, the cooling pressure head 5 is provided with a metal belt 2 disposed on the press surface 5 a and pressing the object to be pressed 20 between the upper and lower metal belts 2. Then, the metal belt 2 is cooled. This cooling pressure head 5 is provided with a first pressure head 5A and a second pressure head 5B on the top and bottom in the same manner as the pressure head 1 for heating described above. As shown in the enlarged sectional view, a pressurizing chamber 50 for supplying a pressurized fluid 51 is provided on the press surface 5a. The pressurizing chamber 50 has a metal belt 2 disposed so as to open a surface facing the opposing pressure head 5 for cooling and close the opening. The pressure head 5 for cooling is provided with a peripheral wall 53 around it, and the inside of the peripheral wall 53 serves as a pressure chamber 50. The peripheral wall 53 is provided with a concave groove 55 for inserting the packing 54 on the contact surface with the metal belt 2. The packing 54 placed in the concave groove 55 is in close contact with the surface of the metal belt 2 in a pressed state, and seals the pressurizing chamber 50. The pressure head 5 for cooling is a hydraulic cylinder 59, and moves the first pressure head 5A up and down to hold the pair of pressure heads in a specified gap. Further, the metal belt 2 is disposed on the press surfaces 5a of the first pressure head 5A and the second pressure head 5B disposed above and below, and the pressed object 20 is placed between the upper and lower metal belts 2. In a state in which the metal belt 2 is pressed, the metal belt 2 is cooled while supplying the pressurized fluid 51 to the pressure chamber 50 and pressurizing the rubber sheet of the pressed object 20 with the metal belt 2. Therefore, cooled oil is supplied as the pressurized fluid 51 to the pressure chamber 50 of the pressure head 5 for cooling. The pressurized fluid 51 supplied to the pressure chamber 50 of the pressure head 5 for cooling cools the metal belt 2 to 100 ° C., for example.

  Further, in the continuous hot press apparatus, the pair of pressure heads 1 are fixed at predetermined positions by the thickness adjusting mechanism 7, the metal belt 2 is brought into close contact with the peripheral wall 13, and the pressure chamber 10 is closed with the metal belt 2. The pressurizing fluid 11 is supplied to the pressurizing chamber 10 as a state in which the pressurizing head 20 is pressed by the pressurizing head 1. The pressurized fluid 11 supplied to the pressurized chamber 10 presses the rubber sheet of the pressed object 20 via the metal belt 2. Furthermore, the pressurized fluid 11 supplied to the pressurized chamber 10 can heat the metal belt 2 with the pressurized fluid 11 as a heated and pressurized fluid. This continuous hot press apparatus can efficiently heat the metal belt by both the heated pressurized fluid supplied to the pressurized chamber and the heating mechanism. However, the metal belt can be heated only by a heating mechanism, and the pressurized fluid supplied to the pressurized chamber can be a fluid that is not heated.

  The pressure head 1 that presses a sheet-like pressed object 20 such as a rubber sheet is a high-pressure press that accurately controls the position of the pair of pressure heads 1 so that the gap between the pressure heads 1 is accurately determined. It is important to keep it constant. This is because a slight gap in the gap affects product quality and production efficiency. In particular, an apparatus for providing a pressurization chamber 10 between the pressurization head 1 and the metal belt 2 and press-fitting a pressurization fluid 11 therein to press the object 20 to be pressed such as a rubber sheet with the metal belt 2 is an additional process. Since the displacement of the pressure head 1 causes the metal belt 2 to meander, it is required to control the gap of the pressure head 1 with extremely high accuracy in order not to reduce the production efficiency. For example, in a rubber sheet vulcanizing apparatus, it is required to control the lateral displacement of the metal belt 2 that presses the rubber sheet to 2 to 3 mm or less.

  The continuous hot press apparatus shown in the figure controls the gap between the pair of pressure heads 1 with a thickness adjusting mechanism 7 having a structure described in detail below. The continuous hot press apparatus is provided with a plurality of thickness adjusting mechanisms 7 on both sides of the pressure head 1 to keep the gap between the pressure heads 1 constant. The apparatus shown in FIGS. 6 to 8 is provided with four sets of thickness adjusting mechanisms 7 in total, two on both sides of the pressure head 1. As shown in FIGS. 8, 16, and 17, the thickness adjusting mechanism 7 includes a guide rod 74 that is fixed to the first pressure head 1A in a vertical posture, and a guide rod 74 that can be inserted into the guide rod 74. With the guide wall 76 fixed to the pressure head 1 </ b> B of 2 and the guide rod 74 inserted into the guide wall 76, the guide wall 76 and the guide rod 74 are inserted into the through holes 77 and 75, and the guide rod 74 is inserted. And a wedge 78 for fixing the guide wall 76 at a fixed position, and a guide rod 74 and an insertion mechanism 79 for inserting the wedge 78 into the through holes 75 and 77 of the guide wall 76.

  The guide rod 74 is fixed to the first pressure head 1 </ b> A so as to extend in the reciprocating direction of the pressure head 1 by the reciprocating mechanism 8. The continuous hot press apparatus shown in the figure reciprocates the first pressure head 1 </ b> A up and down to press the rubber sheet of the pressed object 20. Accordingly, the guide rod 74 is extended in the vertical direction and protrudes downward so as to be inserted into the guide wall 76 fixed to the lower second pressure head 1B. The guide rod 74 in the figure is fixed at the lower end so that the replacement plate 87 can be replaced. The replacement plate 87 is a hard metal plate with little wear, and is fixed to the lower end of the guide rod 74 via a set screw 88 so that it can be replaced. The guide rod 74 can be replaced with a new one when the replacement plate 87 is worn.

  The guide rod 74 has a quadrangular prism shape, and has a through hole 75 into which the wedge 78 is inserted in the horizontal direction in the drawing. The guide rod does not necessarily have a quadrangular prism shape. The guide rod may be a polygonal column, a cylinder, or an elliptic cylinder.

  The through hole 75 of the guide rod 74 shown in the figure is a quadrangle, and the lower surface is a sliding surface 75A along the lower surface of the wedge 78. The through-hole 75 has a sliding surface 75A as an inclined surface. The inclined sliding surface 75A slides on the inclined surface 78A on the lower surface of the wedge 78 in a surface contact state. This structure can reduce wear by sliding in a surface contact state on the lower surface of the wedge 78 inserted into the through hole 75, that is, sliding while contacting in a wide area. However, the lower surface of the through hole does not necessarily have to be an inclined surface along the lower surface of the wedge. The upper surface of the through hole 75 of the guide rod 74 is preferably provided with a clearance between the upper surface of the wedge 78 in a state where the wedge 78 is inserted into the through hole 75 as shown in FIG. The through hole 75 can be inserted until the upper surface is separated from the upper surface of the wedge 78 and the upper surface of the wedge 78 contacts the upper surface of the through hole 77 provided in the guide wall 76. However, the through hole provided in the guide rod is a state where the wedge is inserted into the through hole of the guide wall and the upper surface of the wedge is brought into contact with the upper surface of the through hole of the guide wall. Can also be contacted.

  In the thickness adjusting mechanism 7 of FIG. 17, the guide wall 76 into which the guide rod 74 is inserted is a cylindrical guide cylinder 89. The guide wall 76 of the guide cylinder 89 has a pair of guide walls 76 on opposite wall surfaces. In the guide wall 76 in this figure, the opposing wall surface of the rectangular guide tube 89 is a guide wall 76. The guide wall 74 of the guide tube 89 can prevent the horizontal displacement of the guide rod 74 by inserting the guide rod 74 therein. Further, since the guide rod 74 is inserted between the pair of guide walls 76 and the wedge 78 is inserted into the guide rod 74 and the through holes 75 and 77 of the guide walls 76 on both sides thereof, a strong pressing force is applied to the pressure head 1. The wedge 78 can be held at a specific position and in a specific posture in a state where the pressure acts. The reason why the wedge 78 is not displaced is that the pressing force acting on the pair of pressure heads 1 acts in a balanced manner on the opposing surfaces which are the upper and lower surfaces of the wedge 78 and cancels out. Further, the wedge 78 is not misaligned because there are guide walls 76 on both sides of the guide rod 74 and the guide rod 74 and the guide wall 76 are balanced on both sides of the contact surface of the guide rod 74 with the guide walls 76. This is because a reverse force often acts. Further, the wedge 78 is inserted into and removed from the guide rod 74 and the through holes 75 and 77 of the guide wall 76 in a state in which no pressing force is applied to the pressure head 1, so that the insertion mechanism 79 of the wedge 78 can be changed to a simple cylinder or the like. Can be a mechanism. However, the guide wall of the thickness adjusting mechanism is not specified as a guide tube. The guide wall may be a wall surface disposed on one side of the guide rod, or a structure in which a pair of guide walls provided on both sides of the guide rod are not connected.

  The guide wall 76 is provided with a through hole 77 into which the wedge 78 is inserted in a state where the guide rod 74 is inserted. In the thickness adjusting mechanism 7 of FIG. 17, the through-hole 77 of the guide wall 76 has a quadrangular shape. However, like the through-hole of the guide rod, the through-hole 77 does not necessarily need to be specified as a quadrilateral, and a wedge is inserted. It can be in various shapes.

  As shown in the sectional view of FIG. 16, the through hole 77 of the guide wall 76 is slidably brought into contact with the upper surface of the wedge 78 with the upper surface as a sliding surface 77A, opposite to the through hole 75 of the guide rod 74. A clearance is provided by separating the lower surface from the lower surface of the wedge 78. With this structure, the wedge 78 can be inserted smoothly. However, the lower surface of the through hole of the guide wall can be brought into contact with the lower surface of the wedge while the wedge is inserted into the through hole and the guide rod and the guide wall are stopped at a specific position.

  The upper surface of the through hole 77 of the guide wall 76 becomes the sliding surface 77A of the upper surface of the wedge 78. The through-hole 77 has an upper surface that is the sliding surface 77A as an inclined surface. The sliding surface 77A on the upper surface of the inclined through hole 77 slides on the inclined surface 78B on the upper surface of the wedge 78 in a surface contact state. This structure can reduce wear by sliding in the surface contact state on the upper surface of the wedge 78 inserted into the through hole 77, that is, sliding while contacting in a wide area. However, the upper surface of the through hole does not necessarily have to be an inclined surface along the upper surface of the wedge.

  The wedges 78 shown in FIGS. 16 and 17 have the upper surface inclined downward and the lower surface inclined upward toward the tip inserted into the through hole 75. As shown in FIG. 16, the wedge 78 is inserted into the guide rod 74 and the through holes 75 and 77 of the guide wall 76, and the upper surface is slid on the upper surface of the through hole 77 of the guide wall 76 to guide the guide wall 76. Is pushed up, the lower surface is slid on the lower surface of the through hole 75 of the guide rod 74, and the guide rod 74 is pushed down to fix the guide rod 74 and the guide wall 76 at a fixed position. The wedge 78 shown in the drawing has both the upper surface and the lower surface as inclined surfaces 78A and 78B with respect to the insertion direction, but the wedge may have only the lower surface as an inclined surface and the upper surface as a surface parallel to the insertion direction.

  The wedge 78 is reciprocated by the insertion mechanism 79, inserted into the through holes 75 and 77, and pulled out from the through holes 75 and 77. The insertion mechanism 79 inserts the wedge 78 into both the through holes 75 and 77 in a state where the guide rod 74 is inserted into the guide wall 76, and connects the guide rod 74 and the guide wall 76 to a fixed position. In this state, the pair of pressure heads 1 are held in a predetermined gap and hold the pressed object 20 such as a rubber sheet. Further, the insertion mechanism 79 draws the wedge 78 from the through holes 75 and 77 so that the guide rod 74 can be raised with respect to the guide wall 76. In this state, the metal belt 2 is moved so that the pressed object 20 such as a rubber sheet is not pressed. The insertion mechanism 79 of the plurality of thickness adjusting mechanisms 7 reciprocates the wedge 78 together. In the illustrated continuous hot press apparatus, the insertion mechanism 79 is a cylinder. However, the insertion mechanism can be any mechanism that can reciprocate the wedge.

  The thickness adjusting mechanism 7 in FIGS. 16 and 17 is provided with a stopper 80 that abuts the tip of the guide rod 74. The stopper 80 specifies the position where the guide rod 74 descends. Therefore, the thickness adjusting mechanism 7 including the stopper 80 specifies the lowered position of the guide rod 74 with the stopper 80 and inserts the wedge 78 into the through holes 75 and 77. The thickness adjusting mechanism 7 accurately controls the lowering position of the guide rod 74 with the stopper 80, inserts the wedge 78 into the through holes 75 and 77 in this state, and adjusts the gap of the pressure head 1 with the stopper 80. Keep the state. For this reason, the gap between the pair of pressure heads 1 can be made more accurate. However, the continuous hot press apparatus does not necessarily need to be provided with a stopper. This is because the connecting position between the guide rod and the guide wall can be adjusted at the position where the wedge is inserted into the through hole.

  The thickness adjusting mechanism 7 shown in FIGS. 16 and 17 is provided with a stopper 80 for specifying the lowered position of the guide rod 74 with respect to the guide wall 76. In the thickness adjusting mechanism 7 in these drawings, a stopper 80 is provided at the lower end of the guide wall 76. However, although not shown, the stopper can be connected to the second pressure head. Since the guide wall 76 is connected to the second pressure head 1B, the stopper connected to the second pressure head is connected to the guide wall via the second pressure head.

  The stopper 80 moves in the insertion direction of the guide rod 74, the vertical direction in the figure, and adjusts the vertical position where the guide rod 74 is inserted into the guide wall 76, and the lowered position of the guide rod 74 in the figure. The stopper 80 hits the tip (lower end in the figure) of the guide rod 74 and specifies the position where the guide rod 74 is inserted into the guide wall 76. Therefore, the stopper 80 is provided on the guide wall 76 so that it can move up and down and can stop at a predetermined movement position so that the stop position of the guide rod 74 can be adjusted up and down.

  The stopper 80 in FIGS. 16 and 17 includes a screw rod 81 and an adjusting screw 82 screwed into the screw rod 81. The screw rod 81 is screwed into the end portion of the guide tube 89, that is, the lower end of the guide tube 89 in the drawing. The guide tube 89 is provided with a female screw 89A for screwing the screw rod 81 at the lower end. In order to rotate the screw rod 81, a square head 81A protrudes from the lower end. When the screw rod 81 is rotated, it moves up and down along the female screw 89A of the guide tube 89, and the position is changed. The screw rod 81 moved up and down is stopped at the moved position, and the lower end position of the guide rod 74 is specified.

  In the illustrated stopper 80, an adjustment screw 82 that contacts the tip of the guide rod 74 is screwed into the upper end of the screw rod 81, and this adjustment screw 82 is brought into contact with the lower end of the guide rod 74. The adjusting screw 82 can be moved in the reciprocating direction of the guide rod 74 but is screwed into the screw rod 81 so as not to rotate. The screw rod 81 is provided with a female screw hole 81 </ b> B into which the adjustment screw 82 is screwed in an upper end portion. The female screw hole 81B has a central axis as a reciprocating direction of the guide rod 74. The illustrated adjustment screw 82 is held by the guide cylinder 89 so that the square head 82A is slid on the inner surface of the guide cylinder 89 and does not rotate. The square head 82A of the adjustment screw 82 has an outer shape slightly smaller than the inner shape of the guide cylinder 89 so that it does not rotate but can move in the axial direction. The adjustment screw 82 that does not rotate is relatively rotated in the direction opposite to the rotation direction of the screw rod 81 when the screw rod 81 is rotated. The screw threads of the screw rod 81 and the adjusting screw 82 are in the same direction. For example, when the thread of the screw rod 81 is a right thread, the thread of the adjustment screw 82 is also a right thread. Therefore, when the screw rod 81 is rotated in the upward direction, the adjustment screw 82 is lowered. This is because the adjustment screw 82 is rotated in the opposite direction with respect to the screw rod 81. The screw rod 81 and the adjustment screw 82 are different in the pitch of the thread that moves in one rotation. The screw rod 81 and the adjustment screw 82 having different pitches have different distances to move in opposite directions, and the difference in the movement distance is the movement distance of the tip of the adjustment screw 82. In this structure, the screw rod 81 is rotated once, and the moving distance of the adjusting screw 82 can be made smaller than one pitch of the screw thread. For this reason, the position of the guide rod 74 can be adjusted with higher accuracy by rotating the screw rod 81. However, the stopper can also adjust the position of the guide rod by directly contacting the tip of the screw rod with the tip of the guide rod.

The above continuous hot press apparatus presses and vulcanizes the rubber sheet of the pressed object 20 as follows.
With the reciprocating mechanism 8, the first pressure head 1 </ b> A that is the pressure head 1 is set to the raised position. The reciprocating mechanism 8 raises the first pressure head 1 </ b> A by the hydraulic cylinder 19. This continuous hot press apparatus does not press the pressed object 20 by pressing the first pressure head 1 </ b> A with the hydraulic cylinder 19 of the reciprocating mechanism 8. The reciprocating mechanism 8 only needs to move the first pressure head 1A up and down. That is, the thickness adjusting mechanism 7 holds the pair of pressure heads 1 in a specified gap and presses the rubber sheet of the pressed object 20 with the pressurized fluid 11 supplied to the pressure chamber 10 of the pressure head 1. Because. Therefore, the reciprocating mechanism 8 is not required to have a strong pressing force for pressing the workpiece 20.

  With the first pressure head 1A as the raised position, the rubber sheet of the pressed object 20 is carried in between the first pressure head 1A and the second pressure head 1B. The rubber sheet of the article to be pressed 20 is carried between the pressure heads 1 with the metal belt 2 sandwiched from above and below.

  After carrying the rubber sheet of the pressed object 20 between the first pressure head 1A and the second pressure head 1B, the reciprocating mechanism 8 lowers the first pressure head 1A. At this time, the guide rod 74 connected to the first pressure head 1A is inserted between the guide walls 76 connected to the second pressure head 1B. The first pressure head 1 </ b> A is lowered until the lower end of the guide rod 74 hits the stopper 80.

  With the lower end of the guide rod 74 in contact with the stopper 80, the insertion mechanism 79 inserts the wedge 78 into the guide wall 76 and the through holes 77 and 75 of the guide rod 74 to lock the thickness adjusting mechanism 7, and The gap of the pressure head 1 is kept constant. As shown in FIG. 8, the wedge 78 presses the upper surface of the through hole 77 of the guide wall 76 on the upper surface and presses the lower surface of the through hole 75 of the guide rod 74 on the lower surface. Is fixed in place. In this state, the relative position between the guide rod 74 and the guide wall 76 is specified, and the gap between the first pressure head 1A and the second pressure head 1B is kept constant via the guide rod 74 and the guide wall 76. Is done.

  Thereafter, the pressurized fluid 11 is supplied to the pressurized chamber 10. The pressurized chamber 10 to which the pressurized fluid 11 is supplied is in a state where the opening is closed with the metal belt 2. The pressurized fluid 11 supplied to the pressurized chamber 10 is oil having a pressure of 5 MPa. The pressurized fluid 11 supplied to the pressurizing chamber 10 pressurizes the rubber sheet of the pressed object 20 through the metal belt 2 in a heated state. At this time, the total pressure at which the pressurized fluid 11 presses the pressed object 20 is the product of the pressure of the pressurized fluid 11 and the opening area of the pressurized chamber 10, and this total pressure is 500 to thousands of tons. .

  Further, the continuous hot press apparatus preheats the metal belt 2 transferred to the pressurizing head 1 with the preheating machine 6 and heats the metal belt 2 that transfers the opening of the pressurizing chamber 10 with the heater light 3. To do. The preheating machine 6 supplies high frequency power from a preheating power supply 62 to a preheating excitation coil 61 disposed opposite to the back surface of the metal belt 2 to inductively heat the metal belt 2 to a set temperature. The heating mechanism 3 supplies high frequency power from a high frequency power supply 32 to an excitation coil 31 disposed opposite to the back surface of the metal belt 2 in the pressurizing chamber 10, and induction heats the metal belt 2 to a set temperature. To do. The continuous hot press apparatus of FIG. 5 heats the metal belt 2 to 150 ° C. by the first stage preheating machine 6A, and the second stage preheating of the metal belt 2 heated by the first stage preheating machine 6A. The metal belt 2 heated by the machine 6B to 250 ° C. and heated by the second stage preheating machine 6B is heated to 350 ° C. by the third stage preheating machine 6C. Further, finally, the temperature of the metal belt 2 is heated to 400 ° C. by the heating mechanism 3 provided in the pressure head 1.

  As described above, in the continuous hot press apparatus, the thickness adjustment mechanism 7 moves the metal belt 2 while keeping the gap between the pair of pressure heads 1 constant, so that the pressed object between the metal belts 2 is moved. The rubber sheet 20 is continuously heated and pressurized to vulcanize.

DESCRIPTION OF SYMBOLS 1 ... Pressure head 1A ... 1st pressure head
1B ... Second pressure head
DESCRIPTION OF SYMBOLS 1a ... Press surface 2 ... Metal belt 3 ... Heating mechanism 4 ... Transfer mechanism 5 ... Pressure head for cooling 5A ... First pressure head
5B ... Second pressure head
5a ... Press surface 6 ... Preheating machine 6A ... First stage preheating machine
6B ... Second stage preheater
6C: Third stage preheater 7: Thickness adjusting mechanism 8: Reciprocating mechanism 10: Pressurizing chamber 11 ... Pressurized fluid 13 ... Peripheral wall 14 ... Packing 15 ... Recessed groove 19 ... Hydraulic cylinder 20 ... Pressed object 31 ... excitation coil 32 ... high frequency power supply 33 ... temperature sensor 35 ... magnetic plate 35A ... perforated plate
35B ... Metal plate 36 ... Through hole 37 ... Shield plate 38 ... Through hole 41 ... Roll 50 ... Pressurizing chamber 51 ... Pressurized fluid 53 ... Peripheral wall 54 ... Packing 55 ... Recessed groove 59 ... Hydraulic cylinder 61 ... Preheating excitation coil 62 ... Preheating power supply 63 ... Temperature sensor 74 ... Guide rod 75 ... Through hole 75A ... Sliding surface 76 ... Guide wall 77 ... Through hole 77A ... Sliding surface 78 ... Wedge 78A ... Inclined surface
78B ... Inclined surface 79 ... Insertion mechanism 80 ... Stopper 81 ... Screw rod 81A ... Square head
81B ... Female screw hole 82 ... Adjustment screw 82A ... Square head 87 ... Replacement plate 88 ... Screw 89 ... Guide cylinder 89A ... Female screw 101 ... Pressurizing head 101a ... Press surface 102 ... Metal belt 110 ... Pressurizing chamber 111 ... Pressurizing fluid 120 ... Pressed object 201 ... Heat plate 202 ... Belt 302 ... Metal belt 310 ... Pressure chamber 331 ... Excitation coil

Claims (7)

A first pressurizing head (1A) and a second pressurizing head (1A) each having a pressurizing chamber (10) which is disposed so as to face each other and which is supplied with a pressurized fluid (11) having openings on the faces facing each other A pair of pressure heads (1) composed of a pressure head (1B) and the pressure head (1) in a state where the opening of the pressure chamber (10) provided in the pressure head (1) is closed. A pair of endless metal belts (2) arranged so as to be relatively movable, a transfer mechanism (4) for moving the metal belt (2), and the metal belt (2). A heating mechanism (3) for heating,
The heating mechanism (3) is disposed inside the pressurizing chamber (10) so as to face the back surface of the metal belt (2), and the excitation coil (31) It has a high frequency power supply (32) that supplies high frequency power,
The metal belt (2) is a metal belt made of an induction heating metal that generates heat by a high-frequency magnetic field of the excitation coil (31), and the pressurizing chamber (10) is movable relative to the excitation coil (31). Block the opening of
The excitation coil (31) induction heats the metal belt (2) with high-frequency power supplied from the high-frequency power source (32), and a pair of metal belts (2) pressurized with a pressurized fluid (11) is covered. A continuous hot press device configured to transfer a pressed product (20) in a heated and pressurized state,
A continuous hot press apparatus comprising a magnetic plate (35) disposed in the pressurizing chamber (10) on the metal belt (2) side of the exciting coil (31).   The continuous hot press apparatus according to claim 1, wherein the magnetic plate (35) is a magnetic metal.   The continuous hot press apparatus according to claim 1, wherein the magnetic plate (35) is ferrite.   The continuous hot according to any one of claims 1 to 3, wherein a part or the whole of the magnetic plate (35) is one of a perforated plate (35A) having a plurality of through holes (36) and a net member. Press device.   The continuous hot press apparatus according to any one of claims 1 to 4, wherein the magnetic plate (35) is disposed at a central portion of the metal belt (2).   The pressurizing head (1) is made of metal, and a shield plate (37) is disposed in the pressurizing chamber (10) of the pressurizing head (1) on the back surface of the exciting coil (31). The continuous hot press apparatus as described in any one of Claims 1 thru | or 5.   The continuous hot press apparatus according to claim 6, wherein the shield plate (37) is made of magnetic metal or ferrite.

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