JPH03226398A - Press having double steel belts - Google Patents

Abstract

PURPOSE:To average deviations of a rolling body and to prevent belts from meandering by fixing many rolling units provided with many rolling elements each on each supporter and rolling and circulating the rolling bodies of each rolling unit between the supporter and a running steel belt. CONSTITUTION:Since rolling friction is generated respectively between the rear of each steel belt 1, 1' and the rolling surfaces of the rolling elements 5 of each rolling unit 3, 3 and between the rolling surface of each rolling element 5 and the surface of the track base 6 of each rolling unit, the friction coefficient is so small that the driving power of the steel belts 1, 1' is reduced. Further, since each rolling unit 3 holds the rolling elements 5 through a holder 7 and plural rolling units 3 are mounted on the supporters 4, 4', the rolling elements 5 are held independently by plural rolling units 3 irrespective of generation of deviations and inclinations in the rolling elements 5 in the rolling units 3, 3, therefore, the deviations and inclinations are not accumulated but averaged, and pressing pressure can be elevated without giving a force to meander the steel belts 1, 1'.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a double steel belt machine, and more specifically, to a double steel belt machine, a pair of upper and lower endless steel belts are provided with drive drums at each end. Then, the belt is run under tension, and material is continuously supplied from one end of the belt between the upper and lower opposed belt surfaces, and the surface of the steel belt that is in contact with the material to be pressed (hereinafter referred to as the back surface of the belt). This relates to a device that presses a material to be pressed by applying pressure to it via an upper and lower belt using a pair of press devices installed on one side of the press, and continuously takes out the material from the other end.

(Prior art) A press device with two layers of endless steel belts is used to supply laminated plastic sheets in multiple layers, press them while heating, and mold them into a single sheet. A reinforcing material such as glass fiber or carbon fiber is sandwiched between sheets and pressed by heating, melting or hardening, or a plastic sheet or film is laminated onto a sheet material made of plastic, metal, natural organic material, etc. Then, it is melt-pressed under heat, or a small piece of wood is supplied and heated and pressurized to press it into a sheet shape, or an inorganic substance mixed with a binder etc. is supplied and heated and pressurized and pressed into a sheet shape. It is used in industrial fields such as

In a press device using a steel heald, the shaft ends of a large number of rolls are supported by a frame using bearings, etc., and the frames are installed in upper and lower stages, and by raising and lowering one frame, the distance between the belts can be reduced. A widely used method is to adjust and support the frame fixedly or to apply a force in the opposite direction to counteract the repulsive force from the compressing material when the material is fed between the healds.

In this case, when the material between the belts is pressed, the reaction force from the pressed material is applied at the center of the roll in the direction of widening the belt interval, and the opposing force is applied at the end of the roll axis in the direction of narrowing the belt interval. As a roll, it is subjected to a force that causes it to curve, which causes it to bend. As this press pressure increases, the amount of deflection increases, and may eventually exceed the allowable value and cause the roll to break.

In order to prevent this roll from breaking, it is necessary to increase the strength of the roll, but to do this, it is necessary to increase the diameter of the roll or to support it with a group of backup rolls, similar to rolling rolls in steel plants. It becomes necessary. However, with any of these measures, the interval between rolls must be increased.

On the other hand, in a press device that uses rolls, the press force from the rolls is applied only to the contact point between the roll and the steel belt, and this contact point is a thin straight part parallel to the roll axis, and the force from the rolls is applied to other parts. There is no force applied to the belt, but a reaction force from the material to be pressed acts to spread the belt. In other words, the belt is maintained in a constant position at the position where it contacts the rolls, and a force that tries to spread the belt acts between adjacent rolls (the distortion caused by this force also depends on the rigidity of the belt, but for a given material) In other words, it is proportional to the fourth power of the roll spacing.

In other words, it is necessary to make the arrangement interval of the rolls relatively large,
In addition, since strain is proportional to pressure and proportional to the fourth power of the distance between the rolls, it is necessary to keep the pressing force per unit area below a certain value in order to substantially prevent strain. This limit value is approximately 1 kilogram per square centimeter.

As an improvement on this, the invention described in Japanese Patent Application Laid-Open No. 12192/1980 is known.

That is, in the invention described in this publication, as a method of pressing at a higher pressure while continuously running two stages of upper and lower endless steel belts, sufficient strength is provided with an appropriate distance from the back surface of the belt. A method is provided in which a number of rolls are endlessly connected along the outer periphery of the support with a chain or an equivalent connecting device, and the rolls are rotated in synchronization with the drive speed of the belt. We are hiring.

According to this method, the reaction force of the material during pressing can be countered by the support instead of the roll. Therefore,
Since the diameter of the rolls can be designed to be small, the spacing between the rolls can be made small and high press pressure can be obtained.

However, this method has the disadvantage that it is extremely difficult to keep the upper and lower opposing rolls on the same vertical plane at all times while moving them along with the progress of the belt. That is, when connecting a group of rolls with a chain or equivalent connecting device, a large number of chain links are used, but since the length and elongation of the chain links are different between the upper and lower presses, even if the upper and lower presses are Even if a pair of opposing rolls can be set on the same vertical plane, there is a tendency for the axes to shift during continued operation and to move away from the positions on the same plane. In practice, since the roll group consists of a large number of upper and lower roll groups, it is virtually impossible to install many pairs of upper and lower opposing roll groups on the same vertical plane, even if carefully adjusted at the start of operation. It becomes possible. This means that the stress applied to the material to be pressed through the belt is not on the same plane, resulting in wave-like deformation of the material to be pressed and the belt, and the belt meandering. As a result, the material to be pressed undergoes complicated deformation, and the belt is also subjected to complicated repeated bending stress, making it susceptible to damage and shortening its lifespan. Furthermore, the driving resistance increases,
Therefore, the driving power will increase.

Furthermore, when operating with a constant spacing between a pair of vertically opposing supports, which are constituent members of a press device, the pressing force changes as the axes of the upper and lower opposed rolls deviate from the same vertical plane, resulting in stability. It is impossible to obtain a pressed product with a high quality. In addition, when operating with a constant pressure applied to the entire support using hydraulic pressure, etc., the effective pressure acting on the material varies as the vertically opposing rolls deviate from the same vertical plane. However, stable pressed products cannot be obtained. Moreover, as the operating time passes, it is unavoidable that the amount of misalignment between the cores of the upper and lower rolls changes, and furthermore, because the amount of misalignment of the cores differs for each pair of upper and lower rolls, it is difficult to press in a stable state. This is becoming increasingly impossible.

Furthermore, in this method, a pair of upper and lower chains are driven in synchronization, but as mentioned above, even if they are driven synchronously,
The elongation of chains, etc. during driving caused misalignment of the roll axis, making it difficult to achieve the initial objective.

(Problems to be Solved by the Invention) As described above, in conventional devices of this type, in order to equalize the pressing force on the material to be pressed, it is necessary to increase the distance between the rolls, and the If an attempt is made to increase the pressing force by reducing the distance between the rolls, the center of the rolls will be misaligned and an uneven pressing force will be applied to the material to be pressed, deforming the material and causing irregularities. This resulted in the production of non-defective products, and in addition, a meandering moment was applied to the steel belt, and complicated repeated bending stress was applied to the steel belt, resulting in a shortened belt life.

SUMMARY OF THE INVENTION An object of the present invention is to solve these conventional problems and to provide an apparatus that can press a material to be pressed continuously in an accurate and stable manner.

(Means for Solving the Problem) In order to achieve this object, the present invention includes a pair of endless steel belts that are vertically opposed and run by a drum, and a belt that is disposed inside the circumferential surface of each steel belt. The rolling unit includes a track base, a large number of rolling elements rolling around the track base, and a large number of rolling units attached to opposing surfaces of the respective supports, and a large number of rolling elements rolling around the track base. This is a means for solving the above problem, and consists of a holder that aligns and holds the wafers.

(Function) In the press section, rolling friction occurs between the back surface of the steel belt and the rolling surface of the rolling element of the rolling unit, and between the rolling surface of the rolling element and the surface of the rolling unit track, respectively. Its friction coefficient is extremely small at 0.003 to 0.005.
Not only can the driving power of the steel belt under pressure be reduced, but each rolling unit uses its cage to keep the rolling elements aligned, so by attaching multiple rolling units to a support, rolling can be reduced. Even if a slight deviation or inclination occurs in the rolling elements within the unit, since the rolling elements are held independently in multiple rolling units, these deviations and inclinations will be averaged out without being accumulated. and does not apply any force that would cause rippling or meandering to the steel belt in contact with it. Since the rolling unit can be made smaller and the number of them can be increased and attached to the support, the diameter of the rolling elements held in the rolling unit can be made as small as possible, and therefore the relationship between the rolling elements and the steel belt can be Since the distance between adjacent contact lines can be reduced, the press pressure can be increased without increasing strain on the steel belt. Considering the distortion of the steel belt, it is naturally necessary to consider the mounting interval of each rolling unit. When heating while pressing, a heat source is usually provided for each support, but in this case, since the rolling elements are rolling along the entire back surface of the belt, it is necessary to heat the entire belt. On the other hand, in the present invention, since the rolling elements in the rolling unit simply roll around the way, a heat source is provided on the part of the support facing the way to heat only a relatively narrow area. Compared to the conventional method in which a roller revolves around a support, less heat is radiated and heating efficiency is increased.

(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings. In FIG. 1, reference numerals 1 and 1' denote an upper belt and a lower belt, respectively, which are made of endless steel and are driven under tension by a pair of upper and lower drums 2, 2', respectively.

The material to be pressed 11 is fed from one end between the opposing surfaces of each belt I, 1'.

1' is pressed via upper and lower belts 1, 1' by upper and lower rolling elements of a plurality of rolling units 3 attached to a box-shaped support 4.4' arranged on the back side of the roller.

The box-shaped supports 4, 4' are fixed in the horizontal direction, but in the vertical direction are actuated by springs, hydraulic cylinders, etc., and are mounted so that the rolling wheels are perpendicular to the direction of belt movement. The moving body group 3 presses the pressed material 11 with a predetermined force W via the belts 1 and 1'.

3 to 5 show an example of the rolling unit 3, and are a top view, a side view, and a sectional view, respectively, and the rolling unit 3 is composed of a large number of rolling elements 5, a track 6, and a cage 7. be done.

As shown in FIG. 5, the rolling element 5 is a pestle-shaped roller with a small diameter at the center, and in this embodiment, the roll diameter is set to 4 mm.

As shown in FIG. 6, the track base 6 has a rolling surface of the rolling elements 5 having an oval cross section, and has wing-shaped brackets protruding from both sides thereof as shown in FIG. 7. Further, the retainer 7 includes a group of rolling elements 5 placed on the rolling surface of the track base 6.
. A part of the surface of the rolling element 5 is designed to protrude. Rolling element group 5.5- protruding from this opening
is brought into contact with the back surface of the steel belt 1°1'. Top and bottom 2
The wing-shaped brackets of each track 6 of the stage are the upper and lower supports 4.4.
The rolling elements 5 mounted on the steel belts 1 and 1' and aligned and held in the retainer 7 roll on the surface of the track 6 as the steel belts 1 and 1' press against each other. When a compressive force is generated between the upper and lower supports 4 and 4', the rolling elements 5 press the back surfaces of both steel belts 1°1' via the track 6 of the rolling unit 3, compressing the material to be pressed. do.

When a pestle-shaped roller with a diameter of 4nI11 in this embodiment is used as the rolling element 5, the deflection of the belt is proportional to the fourth power of the distance between the contact lines of adjacent rollers. The surface facing the belt is almost flat and is pushing the belt.

In the present invention, a plurality of rolling units 3, preferably as many as possible, are installed on the support 4.4' even if the rolling elements 5 aligned and held by the retainer 7 slightly wobble within the rolling unit 3. By doing so, the movement of the rolling elements 5 is averaged and meandering moments are prevented from acting on the belt. A pestle-shaped roller with a diameter of 4 mm is used as the rolling element 5, and the outer dimensions of the rolling unit 3 including the mounting part are 41 m in length and 22.2 in width on the supports 4 and 4' at a rate of approximately 1 per square meter. When 0.000 rolling units are installed, the greatest deflection of the belt occurs in the middle between each rolling unit 3, and the interval in this embodiment is about 208. With this unit interval, the thickness of the steel belt 1 is 1.5 mm, and the material to be pressed 11 is 20 kg.
/ct! When a pressure of rG is applied, the maximum value of belt deflection is 4 microns or less, and since the material 11 to be pressed is continuously moving and does not remain in the area where the belt deflection is large, it is hardly practical. It is not affected by any deflection.

Further, in many cases, heating is performed simultaneously under pressure, and therefore heat sources are attached to the upper and lower supports 4, 4', and heat is transferred to each belt 1, 1' through contact with the rolling elements 5 of the rolling unit 3. Here, it is also possible to cut out the side of the retainer 7 of the rolling unit 3 that does not contact the belt, and in this case, the rolling elements 5 are also brought into contact with the support 4.4', and the rolling elements 5 are heated directly. However, it can also assist in heat transfer to the belt. Of course, since the entire rolling unit 3 including the rolling elements 5 is interposed between the support 4° 4' and the belts 1, 1', the rolling elements are not connected to the supports 4, 4' as in the prior art. If the cage 7 is made of a heat insulating material, etc., there will be no wasteful heat radiation from the rolling elements and their cage, and the energy will be reduced by radiation and convection. Thermal efficiency including heat transfer can be significantly improved.

(Effects of the Invention) As described above in detail, the present invention fixes a large number of rolling units each having a large number of rolling elements aligned and held by a cage to a support, and provides a space between the support and a running belt. By rolling and circulating the rolling elements in each rolling unit, the adverse effects on the belt due to misalignment of the rolling elements are averaged out, and the belt can run smoothly without meandering while applying pressure uniformly. Also, when heating the material to be pressed, the rolling elements simply roll and circulate between the support body to which the heat source is attached and the belt, compared to the conventional method in which the rolling elements circulate to the opposite side of the support body from the belt. Heat utilization efficiency can be significantly improved.

[Brief explanation of drawings]

Fig. 1 is a side view of a track double steel belt press machine showing an overview of the present invention, Fig. 2 is a detailed installation view of a rolling unit showing a typical embodiment of the invention, and Fig. 3 is a side view of the same rolling unit. 4 is a side view of the same, FIG. 5 is a sectional view of the same, FIG. 6 is a side view of the track of the rolling unit, and FIG. 7 is a plan view of the same. Description of main parts of the figure 1.1'-Steel belt 2, 2'--Drum 3-Rolling unit 4.4'-
Support 5--Rolling element 6-Railway 7-
・Cage 11・--Material to be pressed 2nd figure

Claims (1)

[Claims] A pair of endless steel belts that are vertically opposed and run by a drum, a support body disposed inside the circumferential surface of each steel belt, and a large number of rollers attached to the opposing surface of each support body. 1. A double steel belt brace machine, comprising: a track base, a large number of rolling elements rolling around the track base, and a holder that holds these rolling elements in alignment.