JPH0632748B2 - Squeeze membrane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is applied to a dewatering machine or the like for squeezing a liquid from a fiber product or the like containing a liquid inside, and is usually formed from an elastic sheet called a squeezing membrane. The present invention relates to a pressing body for squeezing.

(Prior Art) Conventionally, in a machine that handles a liquid, such as a washing machine and a cloth processing machine, the liquid contained in an object to be processed is squeezed in a batch manner and squeezed out. The representative one is
There is one that squeezes the liquid in the object to be squeezed by hydraulically squeezing the object to be squeezed in the container through an elastic film (membrane).

The dewatering device in the continuous water washing machine is one of them. To be more specific, taking this as an example, FIG. 3 shows a conventional dewatering device for laundry and the like, where 1 is a bowl-shaped member called a bell. At the center of the bottom, a pipe through which pressurized water circulates is connected in one body. Reference numeral 2 is a frame that supports the drainage plate 4 and the endless conveyor belt 5. A large number of parallel grooves 44 are formed on the upper surface of the drainage plate 4, and a large number of small holes are formed in the conveyor belt 5 so as to penetrate the front and back sides.

Reference numeral 6 is a disk-shaped membrane made of an elastic film such as rubber, the cross section of which has a rising portion at the circumferential end as shown in FIG. 5, and a hook portion is formed at the rising portion toward the center. At the same time, the tip is wedge-shaped. The membrane 6 is attached to the inner peripheral end surface of the bell 1 in an airtight manner by engaging with a stopper 11 provided near the inner peripheral end surface of the bell 1.

The bell 1 can be lifted and lowered by a lifting device (not shown), and it descends when the laundry 8 that is the object to be pressed is squeezed to assume the position shown in FIG. 3. At this time, the flange portion of the bell 1 and the frame 2 are clamped. It is designed to be clamped by 3. Therefore, the clamp 3 reciprocates between the solid line and the chain double-dashed line as shown by the arrow via an actuating mechanism (not shown).

Next, its operation will be described. FIG. 4 shows a state before the laundry 8 which is the object to be squeezed is squeezed. At this time, the pressurized water 7 is discharged in the direction indicated by the arrow 22 by a pump or the like (not shown), the membrane 6 is supported and fixed by the stopper 11, and is deformed upwardly along the inner curved surface of the bell 1. There is. At the time of this deformation, the membrane 6
Usually, the material is stretched by about 6 to 70%, and therefore, a material having a good elongation and an elongation of 300 to 700% is selected.

As described above, the bell 1 can be moved up and down, and when it is on the upper side, the laundry 8 is preformed in a pre-process (not shown) and is moved to the lower side of the bell 1 by the conveyor belt 5.

After that, the bell 1 descends to a state shown in FIG. 4, and at this time, a space 31 exists between the laundry 8 and the membrane 6.

Next, the clamp 3 holds the frame 2 and the bell 1 moved from the position indicated by the chain double-dashed line to the position indicated by the solid line. When this holding is completed, the water in the direction of arrow 22 shown in FIG. 4 is switched to the direction shown by arrow 21 in FIG. 3 by the switching device (not shown), and the pressurized water 7 acts to pass through the membrane 6. The laundry 8 is squeezed into a pressurized state as shown in FIG. 3, and the squeezed water flows into the groove 44 of the drainage plate 4 through the small hole of the conveyor belt 5, and this groove 44 It is drained to the outside via the.

At this time, the membrane 6 is drained while being deformed along the laundry 8 as shown in FIGS. 2 and 6.

By the way, such a conventional dehydrator is used to wash the laundry 8
When the laundry 8 is dehydrated, the laundry 8 is not completely leveled in the preforming in the previous step, so that the laundry 8 has an uneven shape as shown in FIG. It is partly variable and results in various problems with drying and ironing after dehydration.

Therefore, the leveled laundry 8 as shown in FIG. 2 is desirable.

Further, when the laundry 8 is squeezed by this method, its volume is reduced and its height is reduced to less than half, but since the pressing direction is from the upper side to the lower side, its diameter is increased. . By the way, the one with a diameter of 950 mm
After pressing it will be 1000-1050 mm.

At this time, sandwiching portions 9 and 19 as shown in FIG. 6 are formed on the outer peripheral portion of the membrane 6, the outer peripheral portion of the laundry 8 is pressed against the belt 5 by the membrane 6, and the outer peripheral portion of the laundry 8 is locked. As it becomes, the volume of the laundry 8 is reduced. Membulin 6 which is a rubber body with particularly high elongation
Has a relatively small hardness (for example, Hs 40 °), and the coefficient of friction of the surface is 1.0 to 1.2 with respect to the laundry. That is,
This means that the force for pulling out the laundry from the sandwiching portions 9, 19 is greater than the force for pushing the laundry.

Therefore, if the squeezing is continued while the outer peripheral portion is locked, the laundry 8 having a small elongation will be torn.
The coefficient of friction between the conveyor belt 5 formed of a mesh belt and the like and the laundry is usually adjusted to less than 1.0.

This is especially because when the laundry is biased before dehydration, the deformed portion 29 (Fig. 6) is largely deformed before and after the compression of the laundry, and the volume near the portion is reduced due to the compression. A lot of tears will be seen in the portion indicated by 39. That is, the greater the deformation of the laundry, the greater the tension.

Furthermore, when the pressure of the pressurized water is removed after the dehydration is completed in the state shown in FIG. 6, the dehydrated laundry expands and, conversely, the membrane 6 is pushed from the laundry 8 side. Therefore, the laundry 8 works to dig into the membrane 6, and if the surface friction coefficient of the membrane 6 is larger than 1.0 at this time, there is no slip and there is a negative pressure relationship between the membrane 6 and the laundry 8 as well. Often, the laundry 8 is stuck to the inner surface of the membrane 6 and is lifted by the rise of the bell 1 as it is, and when the next laundry is dehydrated, the previous laundry is placed on the next laundry. There was a problem that the machine would stop and the machine would stop.

(Problems to be solved by the invention) As described above, when a conventional membrane having a high coefficient of friction on the surface and excellent extensibility is used, during deliquoring, the vicinity of the periphery of the membrane and the belt conveyor are A part of the object to be squeezed is in a locked state, and breakage is likely to occur at a portion of the object to be squeezed that is largely deformed by squeezing. On the contrary, the object is sucked on the surface of the membrane, and when the bell is lifted, the object to be pressed in the sucked state ascends together with the membrane and is placed on the object to be pressed next time, resulting in the removal of the next time. It was a cause of stopping the machine at the time of liquid or causing the machine to malfunction.

The present invention has been made as a result of investigating that the cause of the above-mentioned problems is in the structure of the membrane, and aims to reduce the damage of the object to be squeezed and eliminate the cause of machine failure.

(Means for Solving the Problems) Therefore, the present invention has a bowl-shaped support member that is movable up and down and has an internal space formed by attaching a membrane to an abutting portion with an object to be squeezed containing a liquid. Then, while lowering the supporting member to the dehydration position, supplying pressurized water to the space, and pressing the object to be pressed through the membrane against a pressure receiving surface having a drain hole to dehydrate by using a dehydrating device , A few microns on the surface of the Mebren that contacts the object to be squeezed
It is a thin layer having a thickness of several hundreds of microns and has a smoothed portion having a hardness of Hs 75 ° or more, and is used as a means for solving the problem.

(Operation) In the present invention, since a smoothing portion having a hardness of Hs 75 ° or more and having a thin layer of several microns to several hundreds of microns is formed on the surface of the membrane that is in contact with the object to be compressed, the membrane and the object to be compressed are The friction between them is reduced, the object to be squeezed easily slips on the surface of the membrane, and the object to be squeezed is evenly distributed over the surface of the membrane even during deliquoring. Also, the locked state where the object to be squeezed is prevented from happening. Also, since the object to be squeezed easily slips on the surface of the membrane, the object to be squeezed can be prevented from adhering to the surface of the membrane when the pressure of the pressurized water is released at the end of deliquoring.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a squeezed material membrane of the present invention, the overall shape of which is the same as the conventional one. As the material, a material having high extensibility such as rubber is selected as in the conventional case.
However, in the membrane 6 according to this embodiment, the entire surface in contact with the object to be squeezed is subjected to a thin layer smoothing treatment as shown in the figure.

The smoothed surface is formed by coating or adhering the surface of the membrane 6 with a resin having a small friction coefficient such as a fluorine resin. Alternatively, in consideration of the fact that the material itself such as rubber has a low hardness, which makes it difficult to slip with the object to be squeezed, an extremely thin layer portion of the surface of the membrane 6, that is, the membrane. The surface to be contacted with the laundry 8, which is the object to be squeezed, may be subjected to a curing treatment to form a smoothing portion having a thin layer of several microns to several hundreds microns and a hardness of Hs 75 ° or more.

The hardness measurement of rubber is specified in JISK6253 "Vulcanized Rubber Hardness Test Method". However, the thickness is 2 mm or more. Therefore, the thin-layer membrane of "several microns to several hundreds of microns" in the present invention cannot be measured. Therefore, the amount of carbon contained in the membrane is changed, and the test piece having a thickness of 2 mm is changed from Hs 70 ° to 95 ° every 5 °. The corresponding test piece and the surface-hardened membrane were compared for wear coefficient to determine the corresponding hardness.

Furthermore, the surface subjected to the hardening treatment may be subjected to the above-mentioned smoothing treatment.

Therefore, in the present invention, all of the above processes are referred to as smoothing process and used.

When the membrane 6 is subjected to the above-described treatment, its operation will be described by taking a pressing device in a washing machine as an example. By making the surface slippery, for example, as shown in FIG. Even after the dehydration, however, the laundry 8 can always be formed into an averaged shape as shown in FIG. As a result, a uniform residual water content can be obtained in the laundry, and problems such as drying and ironing in the subsequent steps do not occur. In other words, in drying, ironing, etc., it is necessary to set the processing conditions according to the part with the highest residual water content and to perform drying, etc., so other parts tend to be overdried and damage the fiber, If the residual water ratio becomes uniform, the fibers will not be damaged and the energy loss will be reduced.

Further, as described above, when the conventional membrane 6 is used, the laundry 8 before dehydration shown in FIG. 4 is squeezed from above by the membrane 6, so the height becomes half or less, but it is crushed in the diameter direction. As shown in FIG. 6, the sandwiching portions 9 and 19 sandwiched between the membrane 6 and the conveyor belt 5 spread out.
Then, the laundry 8 is contracted to the center by the pressure 17 from the surroundings, and the laundry is damaged at the portion indicated by the reference numeral 39. Here, if the surface of the membrane 6 is smoothed and the coefficient of friction with the laundry is less than 1.0,
It has been clarified from many experiments that the laundry 8 is easily removed from the sandwiched portions 9 and 19 and the laundry 8 is not damaged.

At the end of dehydration, even if the laundry expands when the pressure of the pressurized water is released, the relative slip with the membrane is improved,
It prevents clinging by the membrane and prevents sticking. Therefore, this also improves productivity without stopping the function.

(Effect of the invention) As described in detail above, according to the present invention, a smoothing portion having a hardness of Hs 75 ° or more is formed in a thin layer of several microns to several hundreds of microns on the surface of the membrane that contacts the object to be squeezed. The hardness of the material itself, such as low hardness rubber, can be increased, and since the smoothing part is a thin layer, it deforms in synchronization with the flexibility of the membrane, and the surface that comes into contact with the object to be squeezed slips. Since the compressed object can move without unevenness, the compressed object has a uniform shape after dehydration, the residual water ratio is uniform, and damage to the fiber etc. due to subsequent heat treatment is eliminated, and energy consumption is reduced. The loss of is also reduced. Moreover, the object to be compressed sandwiched between the membrane and the conveyor can easily come out, and the damage to the object to be compressed due to the pulling force is eliminated.

Further, after the dehydration is completed, slippage between the object to be compressed and the membrane is improved, and the hugging of the object to be pressed by the membrane and the generation of negative pressure can be prevented at the same time, and the phenomenon of sticking of the object to be pressed onto the membrane can be prevented. It is possible.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a membrane showing an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view showing a deliquoring state at the end of pressing when the membrane according to the present invention is used, and FIG. Sectional view of the main part of the used dewatering device at the time of dewatering, FIG. 4 is a cross-sectional view of the same main part before dewatering, FIG. 5 is a cross-sectional view of a conventional membrane, and FIG. 6 uses the same conventional membrane. It is a cross-sectional schematic diagram which shows the liquid removal state at the time of the completion of pressing in the case of doing. Explanation of the main parts of the figure 1 …… Bell 6 …… Membrane 8 …… Washed goods 16 …… Smoothed surface

Claims (1)

[Claims] 1. A vertically movable bowl-shaped support member having an internal space formed by attaching a membrane to an abutting portion of an object to be squeezed containing a liquid, and lowering the support member to a dehydration position. Together with supplying pressurized water to the space portion, in the squeezing membrane used in the dehydrator for dewatering by pressing the squeezed object through the membrane to the pressure receiving surface having the drain hole, on the surface of the Mebren that contacts the squeezed object. A squeezing membrane comprising a thin layer having a thickness of several microns to several hundreds of mecron and having a smoothing portion having a hardness of Hs 75 ° or more.