JP2018177416A - Powder supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder feeding apparatus which may feed a measure apparatus with powder at a higher speed and may reduce fluctuation of the amount of powder to be measured.SOLUTION: There is provide a powder feeding apparatus comprising a casing on which an inlet is formed at an upper part and an outlet is formed at a lower part, and a pair of rollers arranged at a middle section between the inlet and the outlet in the casing. The pair of rollers comprise a first roller part having a plurality of parallel recessed shape grooves on its periphery and a second roller part having a plurality of parallel recessed shape grooves on its periphery. The first roller part and the second roller part are alternately arranged in a state where they have different phases.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a powder feeding device, and more particularly to a powder feeding device for feeding a powder obtained by mixing a fiber component and a powder component.

  Friction materials such as brake linings and disc brake pads used for vehicle brakes are made of a friction material composition including a fiber base, an inorganic filler, an organic filler and a binder as a raw material, and such fiber components and powder particles are used. The powder (raw material) mixed with the components is weighed quantitatively and preformed into a predetermined shape, and the obtained preform is hot-pressed and then heat-treated to thermally cure the binder.

  In the production of such a friction material, since the powder used as the raw material is a mixture of the fiber component and the particulate component and the flowability is poor, various improvements are made to the powder supply device for supplying the powder to the weighing device. Has been done (Patent Documents 1 to 3 etc.).

Japanese Patent Laid-Open No. 2003-034444 Patent No. 3330915 Japanese Utility Model Publication No. 03-008655

  As shown in FIG. 1, the powder feeding apparatus includes a casing 20 having an inlet 21 at the upper portion and an outlet 22 at the lower portion, and a pair of rollers disposed between the inlet 21 and the outlet 22 in the casing 20 10 is provided. A portion in sliding contact with the roller 10 in the casing 20 is formed as an arc-shaped portion 23. A hopper 30 for storing powder is disposed continuously on the inlet 21 of the casing 20 at the top of the casing 20.

  In the roller 10, a plurality of concave grooves 12 are formed on the outer periphery 11, and the roller 10 at the right in the figure rotates clockwise, and the roller 10 at the left in the figure rotates counterclockwise. At this time, the powder is filled in the concave groove 12 of the roller 10. The powder filled in the concave groove 11 is cut out with a predetermined volume by the concave groove 12 of the roller 10 and the arc-shaped portion 23 in the casing 20 by the rotation of the roller 10. When the roller 10 further rotates, the cut-out powder is discharged from the outlet 22 of the casing 20. In the powder feeding device of the present invention, the powder is thus fed in a fixed amount.

  A weighing container 40 and a weighing device 50 are disposed in the lower part of the casing 20 to weigh the powder cut out from the powder feeding device. The data measured by the weighing device 50 is output to the drive device of the roller 10 (not shown), and the roller 10 is rotated at a high speed to a predetermined amount to speed up the cutting out of the powder and to exceed the predetermined amount. The rotation of the roller 10 is slowed and set to perform precise weighing. In addition, the left and right rollers 10 are set to be independently rotatable, and when exceeding a predetermined amount, only one of the rollers rotates or the rotational speeds of the left and right rollers are made different to cut out the amount of powder. It is possible to fine-tune the

  As the powder feeding device, if it is possible to shorten the time to feed the powder as the raw material to the measuring device at high speed, the production tact can be shortened by that amount, and the production cost can be suppressed, so high speed powder Supply of the body is desired. However, on the other hand, when powder is to be supplied at high speed, the amount of powder to be weighed tends to vary. In this respect, there is room for improvement in the conventional powder supply devices (Patent Documents 1 to 3 and the like), and a powder supply device capable of supplying at a higher speed and with higher accuracy is desired. From this, it is an object of the present invention to provide a powder feeding device capable of feeding powder to the measuring device at a higher speed and suppressing variation in the amount of powder to be weighed. Do.

  An example of the roller structure used for the conventional powder supply apparatus is shown in FIG. In the roller 10 of FIG. 9, a plurality of concave grooves 12 are formed in a V shape having an apex substantially at the center in the lengthwise direction of the roller 10, and the pair of rollers 10 are V in opposite directions to each other. The vertices of the letter are arranged to face each other.

  The inventors of the present invention conducted intensive studies to find out the cause of the variation in the amount of powder to be weighed which occurs in the roller 10 in which the conventional V-shaped concave groove 12 is formed. When the roller 10 in which the concave groove 12 is formed is used, as shown in FIG. 10, the powder M which is outside the opening 24 on the outlet 22 side and exposed in the space on the outlet 22 drops and cuts out If the powder is a mixture of the fiber component and the particulate component, the fiber component in the powder entangles and is dragged by the powder M which is exposed and falls in the space on the outlet 22 side, and the opening is It was found that the drop of the powder M on the inner side of 24, that is, the drop of the excess powder and the indeterminate amount of the drop of the excess powder are the cause of the variation.

  The inventors of the present invention have a roller structure that can prevent excess powder from falling due to entanglement of the fiber component when the powder is dropped even if the powder is a mixture of the fiber component and the particulate component. Further studies were made to achieve the present invention.

  According to the above findings, the powder feeding device of the present invention comprises a casing having an inlet at the top and an outlet at the bottom, and a pair of rollers disposed between the inlet and the outlet in the casing. In the above, the pair of rollers includes a first roller portion including a plurality of parallelly arranged concave grooves on the outer periphery, and a second roller portion including a plurality of parallel parallel concave grooves on the outer periphery, It is assumed that the first roller portion and the second roller portion are alternately arranged with different phases.

  In the powder supply device according to the present invention, the first roller portion and / or the second roller portion is formed by laminating a plurality of plate members provided with a plurality of parallelly arranged concave grooves on the outer periphery. It can be done.

  Further, in the powder feeding device according to the present invention, it is preferable to provide a powder cross-linking and crushing means for breaking the cross-linking of the powder above the pair of rollers.

  According to the powder supply device of the present invention, it is possible to supply the powder obtained by mixing the fiber component and the particulate component to the measuring device at high speed, and to suppress the variation in the amount of the supplied powder. It is possible to shorten the manufacturing tact of the friction material.

It is sectional drawing which shows an example of a powder supply apparatus. It is a perspective view which shows an example of the structure of a roller in the powder supply apparatus of this invention. It is a perspective view which shows another example of the structure of a roller in the powder supply apparatus of this invention. It is a perspective view which shows another example of the structure of a roller in the powder supply apparatus of this invention. It is a perspective view which shows another example of the structure of a roller in the powder supply apparatus of this invention. It is a perspective view which shows another example of the structure of a roller in the powder supply apparatus of this invention. It is sectional drawing which shows another example of the powder supply apparatus of this invention. It is a graph which shows the dispersion of the measurement weight and measurement time in the powder supply apparatus of this invention, and the conventional powder supply apparatus, FIG. 8 (a) is an example of the powder supply apparatus of this invention, FIG.8 (b) Is an example of a conventional powder feeder. It is a perspective view which shows an example of the structure of the roller used for the conventional powder supply apparatus. It is a schematic diagram explaining the falling state of the powder in the powder supply apparatus using the structure of the conventional roller.

  The configuration of the powder supply device in the present invention is substantially the same as that of the conventional powder supply device shown in FIG. 1, and the structure of the roller 10 is different.

  The perspective view of the roller 10 in the powder feeding device of the present invention is shown in FIG. 2, but the roller 10 comprises a first roller portion 10A and a second roller portion 10B, and the first roller portion 10A and the second roller portion 10B are respectively The outer periphery 11 is provided with a concave groove 12 disposed parallel to a plurality of axes. Further, the first roller portion 10A and the second roller portion 10B are alternately arranged in a circumferentially different phase. For this reason, the concave grooves 12 of the first roller portion 10A and the concave grooves 12 of the second roller portion 10B are alternately arranged in a so-called staggered manner.

  In the powder feeding device according to the present invention, the communication between the concave groove 12 of the first roller portion 10A and the concave groove 12 of the second roller portion 10B is deteriorated by making the roller 10 into the above-mentioned shape. The concave groove 12 of the first roller portion 10A and the concave groove 12 of the second roller portion 10B are divided into small rooms. For this reason, when cutting out using powder which is a mixture of fiber component and powder particle component, even if excess powder falls due to entanglement of fiber component in the powder, the compartment unit divided up to the maximum Therefore, it is possible to cut out the powder more quantitatively while suppressing the amount of variation.

  The roller 10 is manufactured by separately preparing a plurality of first roller portions 10A and second roller portions 10B separately, arranging the first roller portions 10A and the second roller portions 10B in this order, and fixing them to the shaft of the rollers. Can.

  The shape, volume (depth and width of the concave groove 12), and the number of concave grooves 12 of the concave groove 12 of the roller 10 can be adjusted according to the characteristics of the powder supplied by the powder supply device. The shape of the concave groove 12 is desirably formed so that the side surface of the concave groove 12 is at right angles or an obtuse angle with respect to the outer periphery 11. Specifically, an arc shape, an elliptical arc shape, a U shape, and an upper bottom is wide. It is preferable to use a trapezoidal shape or the like. Further, when the diameter of the roller 10 is 60 to 80 mm, it is preferable that the depth of the concave groove be 4 to 12 mm and the width be 8 to 24 mm. The number of concave grooves is appropriately determined from the diameter of the roller 10 and the width of the concave grooves 11, but is preferably 8 to 16.

  The roller portion 10A and the roller portion 10B have their axes aligned with each other, and the center of the outer periphery 11 located between the recessed grooves 12 of the roller portion 10B is disposed near the center of the recessed groove 12 formed in the roller portion 10A. It is preferable to arrange them so as to be out of phase in the circumferential direction centering on the axis so as to be separated. Thereby, the communication of the concave groove 12 of the 2nd roller part 10B is interrupted by the outer periphery 11 of the 2nd roller part 10B, and the concave groove 12 of the 1st roller part 10A can form the state divided into the small room .

  The number of first roller portions 10A and second roller portions 10B in the roller 10 can be appropriately determined. The roller 10 in FIG. 2 is an example in which two second roller portions 10B are disposed between three first roller portions 10A, but between n (where n is 2 or more) first roller portions 10A. The n-1 second roller portions 10B may be disposed on the n-1, and the n first roller portions 10A and the n second roller portions 10B may be disposed in order. When the length of the roller 10 is 50 to 170, the total number of the first roller portion 10A and the second roller portion 10B is preferably 3 to 9.

  In addition, although the first roller portion 10A and the second roller portion 10B in FIG. 2 are an example in which the lengths of the respective roller portions are the same, among the first roller portion and the second roller portion constituting the roller 10 The length of some of the roller portions of the above may be changed. FIG. 3 shows an example of such a roller 10, and in an example in which two second roller portions 10B are disposed between three first roller portions 10A, the first roller portion 10A ′ ′ disposed at the center The width L2 of the first roller portion 10A is larger than the width L1 of the second roller portion 10B. The powder stored in the inlet 21 and the hopper 30 in the casing 20 has the maximum powder pressure at the center, but when the length of the central roller portion is increased as in this example, the pressure is maximum. The cut-out amount of the powder near the center becomes large, and the powder can be cut out efficiently. Instead, since it becomes difficult to finely adjust the amount of clipping, it is preferable to set the length of the roller portion located at the center to about 20 to 30 mm, and the length of the other roller portions to about 14 to 20 mm.

  Further, although the roller 10 in FIG. 1 is a roller having the same shape on the left and right, it may be a roller having different depths, widths, numbers, and the like of the concave groove 12 on the left and right. FIG. 4 shows an example in which rollers of different shapes are used, in which one of the rollers 10 is changed to a roller 10 ′ of a different shape. The roller 10 'also comprises a first roller portion 10A' and a second roller portion 10B ', and the first roller portion 10A' and the second roller portion 10B 'respectively have a plurality of concave grooves 12 arranged in parallel on the outer periphery 11 Prepare. In addition, the first roller portions 10A 'and the second roller portions 10B' are alternately arranged in a circumferentially different phase, and are alternately arranged in a staggered manner. As described above, the powder 10 is rotated at a high speed up to a predetermined amount to speed up the cutting of the powder, and when it exceeds the predetermined amount, the rotation of the roller 10 is delayed to accurately measure the weight. In this way, by changing the shape of the recessed groove 11 on the left and right to make the volume of the recessed groove 11 different in this way, only one roller with a different amount of cutting is rotated when the powder is cut out. Fine adjustment of the cut-out amount of powder can be performed more easily.

  Moreover, the diameters of the rollers 10 can be different between right and left. Also in this case, the amount of cutout is different between the left and right of the roller 10, so fine adjustment of the amount of cutout of the powder can be easily performed.

  Further, as shown in FIG. 5, the first roller portion 10A and the second roller portion 10B can each be formed by laminating a plurality of plate members. FIG. 5 (b) is an example in which the first roller portion 10A is formed by laminating six plate members 10a each having a plurality of concave grooves 12 arranged in parallel on the outer periphery 11, and FIG. 5 (c) is an example. This is an example in which the second roller portion 10B is formed by stacking six plate members 10b each having a plurality of concave grooves 12 arranged in parallel on the outer periphery 11 thereof. The first roller portion 10A and the second roller portion 10B thus manufactured can be manufactured by arranging the first roller portion 10A and the second roller portion 10B in this order and fixing them to the shaft of the roller.

  Furthermore, in the above-described roller 10, as shown in FIG. 6, a partition member 10C can be provided between the first roller portion 10A and the second roller portion 10B. When the partition member 10C is provided, the communication between the concave groove 12 of the first roller portion 10A and the concave groove 12 of the second roller portion 10B is interrupted, and the concave groove 12 of each first roller portion 10A and the second roller portion Since the concave groove 12 of 10 B can be made into a small chamber completely partitioned, the amount of variation of the supplied powder can be further suppressed. Although it is most effective to arrange the partitioning member 10C between each of the first roller portions 10A and the second roller portions 10B, it is most effective between the first roller portions 10A and the second roller portions 10B. It may be arranged.

  In the powder obtained by mixing the fiber component and the particulate component, cross-linking of the powder may occur at the upper portion of the pair of rollers 10 depending on the length and amount of the fiber component. When crosslinking of the powder occurs, the powder is not filled in the concave groove 12 of the roller 10 at that portion, the roller 10 idles, and the amount of the powder cut out is reduced. For this reason, in the case of a powder in which the cross-linking of the powder is likely to occur, it is preferable to provide a crushing means for breaking the cross-linking of the powder on the top of the pair of rollers 10.

  An example of the powder supply device provided with the powder cross-linking and crushing means is shown in FIG. In the powder supply device of FIG. 7, the casing 20 and the roller 10 have the same structure as that shown in FIG. 1, except that the powder cross-linking and crushing means 60 is provided in the hopper 30. In FIG. 7, the powder cross-linking and crushing means 60 has a structure in which two stirring rods 61 are attached to the shaft 62 at different positions, and the shaft 62 is rotated by a motor 63. The tip of the stirring rod 61 has a length that penetrates into the cross-linked portion of the powder, and when the shaft 62 is rotated by the motor 63, the stirring rod 61 has a structure that breaks the cross-linking of the powder.

  In the above-mentioned powder cross-linking and crushing means 60, the motor 63 may be operated intermittently, and the rotation direction can be switched between forward and reverse. The formation of the space due to the cross-linking of the powder occurs because the powder on the inlet 21 side in the casing 20 is cut out, but the powder cross-links and does not fall off on the hopper 30 side. The crushing means 60 may be driven once when cutting out the powder once, and may not be rotated at any time. 7 is an example in which two stirring rods 61 are attached to the shaft 62 while shifting their positions, but the stirring rods 61 can be arranged without shifting their positions, and three or more stirring rods 61 may be provided. can do. Furthermore, instead of the stirring rod 61, a blade-like rotary blade can be provided.

  When the above-described powder cross-linking and crushing means 60 is provided in the powder supply device, the cross-linking of the powder is broken even in the case of the powder in which the cross-linking of the powder is likely to occur. The powder can be reliably filled in the concave groove 12, and the cut-out amount of the powder is stabilized.

  Two rollers (see FIG. 2) having three first roller portions and two second roller portions arranged with a phase shift between the first roller portions are attached to the powder supply device shown in FIG. It was set as the powder supply apparatus of the example of this invention. The first roller portion and the second roller portion have a diameter of 80 mm, a groove shape of 8 grooves, a groove width of 24 mm, and a groove depth of 12, and the groove is formed parallel to the axial center It is.

  A groove having a diameter of 80 mm, 18 grooves, a groove width of 12 mm, and a groove depth of 6 mm, and such grooves are formed as a pair of V-shaped grooves opposed to each other when viewed from above A pair of rollers (see FIG. 9) was prepared and attached to the powder feeding device shown in FIG. 1 to make a conventional powder feeding device.

  A powder consisting of 27% by mass of a fiber base, 33% by mass of an inorganic filler, 21% by mass of an organic filler, and 19% by mass of a binder is prepared as a powder obtained by mixing a fiber component and a particulate component. The powder feeding apparatus of the present invention and the conventional powder feeding apparatus weigh (cut out) 80 g of powder, and the weight (weighing weight) of the weighed powder and time to complete the weighing (weighing time) Was measured. In weighing, the rotational speed of the roller is driven at 40 rpm until the weighed weight is 48 g, and when the weighed weight exceeds 48 g, the rotational speed of the roller is driven at 15 rpm and driven, and further, weighed. When the weight exceeded 68.5 g, the roller was rotated at a rotational speed of 6 rpm to drive at high speed and precision. The weight of the weighed powder at this time and the time until the completion of the weighing are shown in FIG. FIG. 8 (a) shows the distribution of the weighing weight and the weighing time by the powder feeding device of the invention example, and FIG. 8 (b) shows the distribution of the weighing weight and the weighing time by the powder feeding device of the conventional example. .

  As shown in FIG. 8 (a), in the measurement by the powder supply device of the example of the present invention, the variation of the measurement weight is small, and the supply amount is within the range of the appropriate amount. Moreover, the variation in weighing time is also small, and the weighing time is also short. From this, it can be seen that stable and high-speed weighing can be performed according to the powder supply device of the example of the present invention.

  On the other hand, in the weighing by the powder feeding device of the conventional example, as shown in FIG. 8 (b), the variation of the weighing weight is large, and in the portion shown by the dotted line at the lower right in the figure, the feeding amount becomes excessive. ing. In addition, it is understood that the portion indicated by the dotted line on the upper left in the drawing takes a long time for weighing, the supply amount is unstable, and the weighing time is not stable.

  As mentioned above, according to the powder supply apparatus of this invention, while being able to supply powder to a measuring apparatus at high speed, it was confirmed that the dispersion | variation in the quantity of the powder measured can be suppressed.

  The powder feeding device according to the present invention can feed the powder obtained by mixing the fiber component and the particulate component to the measuring device at high speed, and can suppress the variation in the amount of the powder fed. They are suitable for manufacturing friction materials such as brake linings and disc brake pads used for vehicle brakes.

Reference Signs List 10, 10 'roller 11 roller outer periphery 12 recessed groove 10A, 10A', 10A '' first roller portion 10B, 10B 'second roller portion 10C partition member 20 casing 21 casing inlet 22 casing outlet 23 casing 23 Arc-shaped portion 24 Outlet side opening 30 of casing 30 Hopper 40 Weighing container 50 Weighing device 60 Powder cross-linking and crushing means 61 Stir bar 62 Shaft 63 Motor

Claims (3)

A casing having an inlet at the top and an outlet at the bottom;
In a powder feeding device comprising a pair of rollers disposed intermediate the inlet and the outlet in the casing,
The pair of rollers includes a first roller portion including a plurality of parallelly disposed concave grooves on the outer periphery, and a second roller portion including a plurality of parallel parallel disposed concave grooves on the outer periphery, The powder supply apparatus in which a roller part and the said 2nd roller part are arrange | positioned alternately by making a phase different.   The powder supply device according to claim 1, wherein the first roller portion and the second roller portion are formed by laminating a plurality of plate members provided with a plurality of parallelly arranged concave grooves on the outer periphery.   The powder feeding device according to claim 1 or 2, wherein a powder cross-linking and breaking-up means for breaking the powder cross-linking is provided above the pair of rollers.