Hopper and powder supply device

Abstract

Provided is a technique for suppressing the occurrence of flashing when a material is introduced into a hopper. 【Solution means】A receiving part 11c for receiving powder, and a lower side than the receiving part 11c A feeding part 11d located at the position of the powder and sending the powder to the feeder 80, and a powder contact part 12 located between the receiving part 11c and the feeding part 11d and hit by the powder during the fall of the powder. The powder contact part 12 is a cylindrical member communicating vertically, and the inner surface thereof has a reduced diameter as it goes downward, and a first member 30 against which the powder hits the inner surface, and a first convex part (cone body 21) located between the first member 30 and the feeding part 11d and having a reduced diameter as it goes upward, and a second member 20 against which the powder passing through the first member 30 hits the surface of the first convex part (cone body 21). A hopper 10 is provided in which a first flow path (flange opening 23) for dropping the powder toward the feeding part 11d is provided around the bottom surface of the first convex part (cone body 21).

Description

Technical Field

[0001] The present invention relates to a hopper and a powder supply device.

Background Art

[0002] There is known a device that stores powder in a hopper and supplies the powder to the next process with a feeder. When gas is contained in the powder supplied from the upstream cut gate to the hopper, the fluidity of the powder increases rapidly, and flushing may occur. Flushing refers to a phenomenon in which the fluidity of the powder increases rapidly due to the inclusion of gas in the powder, and it flows like a low-viscosity fluid with a slight differential pressure or driving force. When flushing occurs, it becomes difficult to stop the flow of the powder. Therefore, various techniques have been proposed to prevent flushing (see, for example, Patent Document 1). Patent Document 1 discloses a configuration including a conical baffle plate and a barrier member fixed by a stay at the bottom of a vibrating feeder (vibrating powder and granule discharging device), and a flow control plate at the lower part. This is to prevent flushing even when the distance between the bottom surface of the barrier member and the discharge port is larger than before.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When supplying a powder having high flushing properties, such as silica, using a hopper, the powder flowing into the hopper from the cut gate may not stop at the feeder provided below the hopper. In this case, there is a possibility that the supply amount of the powder cannot be controlled.

[0005] The present invention has been made in view of such a situation, and an object thereof is to be able to control the supply amount of powder even when powder having high fluidity is charged into the hopper.

Means for Solving the Problems

[0006] According to the present invention, the following techniques are provided. 1. A receiving part for receiving powder, A feeding part located below the receiving part and feeding the powder to a feeder, A powder contact part located between the receiving part and the feeding part and against which the powder hits during falling, and having, The powder contact part is A cylindrical member communicating vertically, the inner surface of which decreases in diameter toward the lower side, and a first member against which the powder hits on the inner surface, A second member located between the first member and the feeding part, having a first convex part that decreases in diameter toward the upper side, and against which the powder passing through the first member hits on the surface of the first convex part, And having, A first flow path for causing the powder to fall toward the feeding part is provided around the bottom surface of the first convex part, a hopper. 2. The tip of the first convex part enters the opening below the first member without contacting the first member, the hopper according to 1. 3. The powder contact part is Further having a third member having a second convex part that decreases in diameter toward the upper side between the receiving part and the first member, A second flow path for causing the powder to fall toward the first member is provided around the bottom surface of the second convex part, the hopper according to 1. or 2. 4. When the area of the gap between the first member and the second member at the same height as the opening below the first member is S1, and the area of the second flow path at the same height as the bottom surface of the second convex part is S2, S1 / S2×100(%) is 10% or more and 20% or less. The hopper according to 3. 5. The hopper according to any one of 1. to 4., wherein when viewed from below, the bottom surface of the first convex portion of the second member covers the lower opening of the first member. 6. The hopper according to any one of 1. to 5., further comprising a fourth member which is a straight pipe above the powder contact portion. 7. The hopper according to any one of 1. to 6., a feeder that receives powder from the hopper and supplies the powder to the outside, a mass measurement device that measures the mass change of the hopper and the feeder and measures the mass of the powder supplied from the feeder to the next process, and a powder supply device having the same.

Advantages of the Invention

[0007] According to the present invention, by adopting the hopper as described above, it is possible to suppress the occurrence of flushing when the material is charged into the hopper, and to realize a powder supply device capable of stably supplying powder.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Best Mode for Carrying Out the Invention

[0009] <<First Embodiment>> <Outline of Powder Feeding Device 1> FIG. 1 is a schematic diagram showing a schematic configuration of the internal structure of the powder feeding device 1 of the present embodiment. FIG. 2 is a schematic diagram showing a schematic configuration of the internal structure of the hopper 10 and the feeder 80, and is an enlarged view of region A in FIG. 1. FIG. 3 is a view showing the second member 20, where FIG. 3(a) is a perspective view and FIG. 3(b) is a longitudinal sectional view. FIG. 4 is a view showing the first member 30, where FIG. 4(a) is a perspective view and FIG. 4(b) is a longitudinal sectional view. In the drawings, the flow of the powder P is indicated by arrows.

[0010] The powder feeding device 1 of the present embodiment includes a mass measuring device 90, a feeder 80, and a hopper 10. An air-driven cut gate 72 is provided, as an example, above the hopper 10. By opening and closing the air-driven cut gate 72, a predetermined amount of powder P falls from upstream of the air-driven cut gate 72 and is introduced into the hopper 10. Note that a soft cylindrical member 17 (for example, a polyester bag) connects the air-driven cut gate 72 and the receiving portion 11c of the hopper 10 (the opening 55 at the upper part of the straight pipe 50 in the present embodiment) so that the air-driven cut gate 72 and the mass upstream thereof do not act on the mass measuring device 90.

[0011] Powder is an aggregate of fine solid particles, and granule is an aggregate of relatively coarse solid particles. There is no clear distinction between powder and granule, but generally, those with a particle size of 1 mm or less are regarded as powder, and those larger than that are regarded as granules. Hereinafter, unless otherwise specified, powder and granule will be referred to as "powder" for convenience. Also, as an example, the size of the powder in the present embodiment is about 0.01 μm to 500 μm.

[0012] Feeder 80 supplies the powder P stored in hopper 10 to the next process with a set constant mass. As an example, the feeder 80 is a table feeder and a disk feeder. The table feeder is a type of rotary motion feeder, which is a device where a disk or scraping blades attached to the lower part of a cylindrical hopper rotate to cut out the powder P. The disk feeder is a device that rotates a supply disk with circumferential grooves on its upper surface in a certain direction, drops and accumulates the powder P on the supply disk at a predetermined position, scrapes the accumulated powder P into the grooves of the supply disk by a scraping plate, and cuts out the powder P while rotating.

[0013] The mass measuring device 90 measures the mass change of the hopper 10 and the feeder 80 to grasp the mass of the powder supplied from the feeder 80 to the next process, and the feeder 80 performs feedback control in response to the result.

[0014] In this embodiment, the hopper 10 has a configuration (the first member 30 and the second member 20) such that no flushing occurs in the input powder so that the feedback control by the feeder 80 can be properly performed. This will be specifically described below.

[0015] <Hopper 10> Hopper 10 receives the powder P from the receiving part 11c at the top of the hopper, stores a certain weight of the powder P, and sends the powder P from the feeding part 11d at the bottom of the hopper to the feeder 80. In this embodiment, as an example, the receiving part 11c is the opening 55 at the upper part of the straight pipe 50. Also, the second member 20 is attached via a connecting member 19 having a communication hole 18 on the upper surface of the feeder 80, and the bottom surface (flange part 22) of the second member 20 serves as the feeding part 11d at the bottom of the hopper.

[0016] Hopper 10 has a hopper body 11, a powder contact part 12 provided inside the hopper body 11, and a straight pipe 50 (fourth member) provided above the powder contact part 12. Specifically, the powder contact part 12 is provided between the receiving part 11c and the feeding part 11d. As the powder contact part 12, a first member 30 and a second member 20 are arranged in order from the top. It is preferable that the centers of the hopper body 11, the first member 30, the second member 20, and the straight pipe 50 coincide in a top view.

[0017] The hopper body 11 is a cylindrical member, and a straight pipe 50 is provided at the opening at the top. The hopper body 11 is not limited to the illustrated shape and can adopt various shapes. The hopper body 11 may be composed of a plurality of members (upper hopper body 11a and lower hopper body 11b) as described below, or may be configured as a single member. Also, the hopper body 11 may have the same inner diameter as a whole, or may have different inner diameters depending on the vertical position. The powder P introduced from its upstream by the opening and closing of the air-driven cut gate 72 is received from the receiving part 11c and supplied into the hopper body 11 through the straight pipe 50. Inside the hopper body 11, it is preferable that the first member 30 and the second member 20, which are the powder contact part 12, are arranged vertically so that their centers coincide in a top view. The powder P passes through the straight pipe 50, the first member 30, the second member 20 inside the hopper body 11, passes through the feeding part 11d, and is supplied to the feeder 80.

[0018] The hopper body 11 has an upper hopper body 11a on the upper side and a lower hopper body 11b on the lower side. The flange part 32 of the first member 30 is attached so as to be sandwiched between the upper hopper body 11a and the lower hopper body 11b. Also, the second member 20 is attached to the bottom surface of the lower hopper body 11b so that the ring part 25 of its flange part 22 is sandwiched between the lower hopper body 11b and the connecting member 19 at the hopper bottom.

[0019] <Straight pipe 50 (fourth member)> The straight pipe 50, which is the fourth member, has, as an example, a straight pipe body 51 and an air vent 52. The straight pipe body 51 is, as an example, a stainless steel circular pipe with a circular cross-section. The upper opening 55 of the straight pipe 50 functions as the receiving portion 11c. The diameter of the straight pipe body 51 is, as an example, 100 mm or more and 300 mm or less. The diameter of the straight pipe body 51 is 30% or more and 85% or less, preferably 50% or more and 65% or less, and more preferably 55% or more and 60% or less, with respect to the diameter of the hopper body 11 at the position of the lower opening 54 of the straight pipe body 51. By setting the diameter of the straight pipe body 51 with respect to the diameter of the hopper body 11 as described above, when the powder P is put into the hopper body 11, it is possible to prevent the powder P from diffusing or scattering and entraining the air in the hopper body 11.

[0020] <The first member 30> The first member 30 is located above the second member 20. In other words, it is disposed between the straight pipe 50 and the second member 20. The first member 30 is a cylindrical member located between the receiving portion 11c and the feeding portion 11d and communicating vertically, and its inner surface tapers downward and the powder P hits the inner surface. The first member 30 is, as an example, made of stainless steel.

[0021] The first member 30 has a funnel body 31 in the shape of a so-called funnel and a flange portion 32 that extends annularly outward at the upper end of the funnel body 31. The funnel body 31 has an inner surface that tapers downward and is a portion where the powder P hits. Specifically, the funnel body 31 has a shape in which a cone is inverted and its lower end portion is cut off, and has an upper opening 34 on the upper side and a lower opening 33 on the lower side. A flow path through which the powder P passes is formed between the upper opening 34 and the lower opening 33. The shape of the funnel body 31 may be any shape as long as its inner surface tapers downward, and it may be a shape in which a pyramid is inverted and its lower end portion is cut off instead of a cone. When the funnel body 31 tapers, it means that the inner size shrinks. In the case of a cone, it means that the inner diameter becomes smaller. In the case of a pyramid, it means that the maximum width of the cross-sectional shape becomes smaller and the lengths of the respective sides also become smaller accordingly.

[0022] The flange portion 32 is sandwiched between the upper hopper body 11a and the lower hopper body 11b, and the first member 30 is fixed to the hopper body 11.

[0023] The distance between the first member 30 (funnel body 31) and the straight pipe 50 is, for example, 0 mm or more and 900 mm or less. By setting the distance between the first member 30 and the straight pipe 50 within the above range, it is possible to minimize the entrainment of air into the powder P and introduce it into the first member 30.

[0024] In the funnel body 31, the powder P that enters from the upper opening 34 and falls hits the inner surface and is collected at the center due to the inclination of the inner surface, and then moves downward (that is, toward the second member 20) from the lower opening 33 and is discharged. The inclination angle θ1 of the inner surface of the funnel body 31 with respect to the horizontal plane is, for example, 35° or more and 70° or less, and preferably 40° or more and 50° or less. By setting the inclination angle θ1 within the above range, the powder P can move smoothly downward without staying in the middle. From another perspective, the inclination angle θ1 is larger than the angle of repose of the powder P. The angle of repose refers to the angle formed between the slope of the mountain of powder formed when the powder is dropped from a certain height and remains stable without spontaneously collapsing and the horizontal plane. For the measurement of the angle of repose of the powder P, there are various measurement methods such as the injection method using a funnel and a disk tray, the discharge method, and the inclination method. In this embodiment, it is based on the injection method. The angle of repose can be measured, for example, using a powder property evaluation device (Powder Tester PT-X (manufactured by Hosokawa Micron Corporation) or Multi Tester MT-1 (manufactured by Seishin Enterprise Co., Ltd.)).

[0025] The inner diameter of the upper opening 34 substantially coincides with the inner diameter of the hopper body 11 at the location where the funnel body 31 is clamped (the inner diameter at the lower part of the upper hopper body 11a and the inner diameter at the upper part of the lower hopper body 11b). When the inner diameter of the upper opening 34 is R31 and the inner diameter of the lower opening 33 is R32, the ratio R32 / R31 is, for example, 0.3 or more and 0.5 or less. By setting the ratio R32 / R31 within the above range, the powder P can be collected within a certain range at the center of the hopper body 11, and the entrainment of air contained in the powder P can be reduced.

[0026] In this embodiment, although the horizontal cross-section of the funnel body 31 is circular, it is not limited to this. For example, the cross-section may be polygonal or a shape combining a straight line and a curve. In any case, a configuration is adopted in which the powder P can move smoothly downward.

[0027] <The second member 20> The second member 20 is located between the first member 30 and the feeding part 11d. The second member 20 has a conical body 21 which is a first convex part that tapers upward and a flange part 22. The powder P that has passed through the first member 30 hits the surface of the conical body 21.

[0028] The conical body 21 is, for example, a cone. The conical body 21 may be a polygonal pyramid, but considering the smooth movement of the powder P, a polygonal pyramid with a cross-section close to a circle (for example, a polygon with 8 or more sides) is preferred. That the conical body 21 has a reduced diameter towards the upper side means that the outer shape of the conical body 21 shrinks. In the case of a cone, it means that the outer diameter becomes smaller. Also, in the case of a polygon, it means that the maximum width of the cross-sectional shape becomes smaller and the lengths of the respective sides also become smaller accordingly.

[0029] The conical body 21 does not have an opening. Therefore, the powder P does not move directly below the conical body 21. Also, the conical body 21 does not have a concave-like shape where the powder P can stay.

[0030] The tip of the conical body 21 enters the interior of the first member 30 from the lower opening 33 of the first member 30. At this time, the conical body 21 is not in contact with the first member 30 (more specifically, the funnel body 31). That is, the lower opening 33 of the funnel body 31 is not closed by the second member 20, and a flow path for the powder P is secured.

[0031] Also, when viewed from below, the bottom surface of the conical body 21 (the first convex portion) of the second member 20 covers the lower opening (the lower opening 33) of the first member 30. In other words, the inner diameter of the lower opening 33 is smaller than the outer diameter of the bottom surface of the conical body 21 of the second member 20. With this configuration, the powder P moving downward from the lower opening 33 does not directly fall into the flange opening 23 of the flange portion 22. Thereby, the function as a baffle plate of the conical body 21 can be surely exerted.

[0032] A first flow path for dropping the powder P towards the feeding portion 11d is provided around the bottom surface of the conical body 21.

[0033] Specifically, an annular flange portion 22 extending outward is provided on the bottom surface of the conical body 21. The flange portion 22 has an outermost ring portion 25 and a flange bridge portion 24 that connects the ring portion 25 and the conical body 21. The flange bridge portion 24 is provided in a shape connected to the conical body 21 at four locations as an example. An opening defined by the bottom surfaces of the ring portion 25, the flange bridge portion 24, and the conical body 21 is the flange opening 23. The flange opening 23 is connected to the feeder 80, and the powder P is supplied to the feeder 80 through the flange opening 23. That is, the flange opening 23 functions as the first flow path.

[0034] The inclination angle θ2 of the side surface 27 of the conical body 21 with respect to the horizontal plane is larger than the angle of repose of the powder P. The inclination angle θ2 is, for example, 45° or more and 70° or less, preferably 50° or more and 65° or less. The angle of repose of the powder P is 10° or more and 55° or less when the average particle size is 0.01 μm or more and 50 μm or less. When the inclination angle θ2 is not constant, the inclination angle θ2 is larger than the angle of repose of the powder P at any position and is within the above range.

[0035] By making the inclination angle θ2 larger than the angle of repose of the powder P, the powder P surely moves downward without staying on the side surface 27 of the conical body 21.

[0036] Examples of the powder P include silica, crystalline zeolite, calcium oxide, and the like. The average particle size of the powder P is, for example, 0.01 μm or more and 50 μm or less. The jet index of the powder P is 60 or more and 100 or less. The jet index is an index proposed by R.L. Carr to quantitatively represent the ease of flushing of the powder P. The jet index is calculated as the sum of indexes obtained from an empirical conversion table for measured values of the fluidity index, collapse angle, difference angle, and dispersibility. The jet index (fluidity index, collapse angle, difference angle, and dispersibility) can be measured using, for example, a powder property evaluation device (Powder Tester PT-X (manufactured by Hosokawa Micron Corporation) or Multi Tester MT-1 (manufactured by Seishin Enterprise Co., Ltd.)). The fluidity index is an evaluation index for comprehensively and quantitatively expressing fluidity. It is obtained by measuring four types of values of powder: (1) angle of repose, (2) compressibility, (3) spatula angle, and (4) uniformity or degree of aggregation, and assigning scores to the top 25 indices empirically obtained for many powders for each of these values, and is represented by the sum of these values. The angle of collapse is the inclination angle of the collapse surface formed by collapsing the powder deposit layer by applying a certain impact force, such as dropping a weight or using an electromagnetic impacter, onto a rectangular vat on which the base for measuring the angle of repose is placed, after measuring the angle of repose. The difference angle refers to the difference between the angle of repose and the angle of collapse. The degree of dispersion is a numerical expression of the property of powder particles in the gas phase to tend to exist individually dispersed. There are various evaluation methods depending on the purpose, such as (1) representing it by the flow velocity required to scatter the particles of the deposited powder in an air stream, and (2) representing it by the ratio of the scattered particles when placed in an air stream with a constant flow velocity. Usually, powders with a high degree of dispersion have a large scattering property.

[0037] <Movement of Powder P> The movement of powder P in the hopper 10 with the above configuration will be described with reference to FIGS. 1 and 2. When the air-driven cut gate 72 is opened and the powder P introduced into the hopper 10 enters the hopper body 11 from the straight pipe 50, first, it passes through the upper opening 34 of the first member 30, and a part hits the inclined surface of the funnel body 31 and changes its direction toward the center side. Also, a remaining part of the powder P hits the conical body 21 inserted into the lower opening 33 of the first member 30 and changes its direction outward. In this way, the powder P moves downward in the region between the upper opening 34 of the first member 30 and the conical body 21 at that position.

[0038] Furthermore, the powder P moves downward along the inclined surface of the conical body 21 and is introduced into the feeder 80 from the flange opening 23 provided in the flange portion 22 of the second member 20. The powder P is sent out to the outside by the scraping blade 81 of the feeder 80.

[0039] In this way, by the second member 20 and the first member 30 functioning as baffle plates, the time for the powder P to fall is ensured. Also, with respect to the area of the upper opening 34 of the first member 30, the area of the powder passage formed by the lower opening 33 of the first member 30 with a reduced diameter and the conical body 21 of the second member 20 becomes smaller, so that the air contained in the powder P can be reduced. As a result, the occurrence of flashing can be suppressed. Further, according to the powder supply device 1 having the hopper 10 with the powder contact portion 12 (the first member 30 and the second member 20), the feeder 80, and the mass measuring device 90, the fluctuation in mass measurement accompanying the stable fall of the powder P can be suppressed.

[0040] <<Second Embodiment>> The hopper 10 of the second embodiment will be described with reference to FIGS. 5 and 6. The description will focus on the differences from the first embodiment, and the same components will be denoted by the same reference numerals and the description will be omitted as appropriate. FIG. 5 is a schematic diagram showing the schematic configuration of the hopper 10. FIG. 6 is a view showing the configuration of the third member 40, where FIG. 6(a) is a perspective view and FIG. 6(b) is a longitudinal sectional view.

[0041] In the present embodiment, the difference from the first embodiment is that, in addition to the first member 30 and the second member 20, a third member 40 is further added as the powder contact portion 12 to the configuration of the first embodiment. The third member 40 is provided above the first member 30. That is, it can be said that the third member 40 is provided between the straight pipe 50 and the first member 30. Preferably, the centers of the third member 40 and the first member 30 coincide in a top view. Below the straight pipe 50, the third member 40 is disposed instead of the first member 30.

[0042] The third member 40 has the same shape as the second member 20. Specifically, the third member 40 has a conical body 41 and a flange portion 42. The conical body 41 is a second convex portion whose diameter decreases as it goes upward, and is, for example, a cone or a pyramid. The conical body 41 may have exactly the same structure as the conical body 21 of the second member 20, or may have a structure with a smaller size or a different inclination. However, similar to the conical body 21 of the second member 20, the conical body 41 of the third member 40 also has a diameter that decreases as it goes upward, and the inclination angle θ3 of the side surface 47 of the conical body 41 with respect to the horizontal plane is larger than the angle of repose of the powder P. The inclination angle θ3 is, for example, 45° or more and 70° or less, preferably 50° or more and 65° or less.

[0043] The distance from the tip of the conical body 41 to the lower end portion 53 (opening 54) of the straight pipe 50 is, for example, -100 mm or more and +200 mm or less. When the distance is negative, it indicates a state where the tip of the conical body 41 has entered from the lower end portion 53 (opening 54) of the straight pipe 50. However, even when the distance is negative, the conical body 41 and the straight pipe 50 are not in contact. FIG. 5 shows a state where the distance is positive and the tip of the conical body 41 has not entered the lower end portion 53 (opening 54) of the straight pipe 50. Also, when the distance is negative, that is, when the tip of the conical body 41 has entered from the lower end portion 53 (opening 54) of the straight pipe 50, the lower end portion 53 (opening 54) of the straight pipe 50 becomes narrower and the falling speed of the powder P decreases. In order to ensure sufficient space for the powder P to pass through and prevent the falling speed from decreasing too much, the ratio SB / SA of the cross-sectional area SB of the conical body 41 at the position of the opening 54 to the area SA of the opening 54 is preferably 0.5 or less, more preferably 0.4 or less. Also, from the viewpoints of always applying the powder P to the conical body 41 and preventing the entrainment of air in the hopper 10 due to the diffusion and scattering of the powder P, the diameter of the bottom surface of the conical body 41 is preferably the same as or larger than the diameter of the lower end portion 53 (opening 54).

[0044] Around the bottom surface of the conical portion main body 41, a second flow path for causing the powder P to fall toward the first member 30 is provided. Specifically, an annular flange portion 42 extending outward is provided on the bottom surface of the conical portion main body 41. Similar to the flange portion 22 of the second member 20, the flange portion 42 has an outermost ring portion 45 and a flange bridge portion 44 connecting the ring portion 45 and the conical portion main body 41. The flange bridge portion 44 is provided, for example, in a shape connected to the conical portion main body 41 at four locations. The opening defined by the ring portion 45, the flange bridge portion 44, and the bottom surface of the conical portion main body 41 is the flange opening 43. Through the flange opening 43, the powder P moves to the funnel main body 31 in the first member 30. That is, the flange opening 43 functions as the second flow path. Further, the ring portion 45 and the flange portion 32 of the first member 30 are sandwiched between the upper hopper main body 11a and the lower hopper main body 11b, so that the first member 30 and the third member 40 are fixed to the hopper main body 11.

[0045] The second member 20, the first member 30, and the third member 40 have, for example, the following relationship with respect to the flow path through which the powder P moves. When the area of the gap between the first member 30 and the second member 20 at the same height as the lower opening (lower opening 33) of the first member 30 is S1, and the area of the second flow path (that is, the flange opening 43) at the same height as the bottom surface of the second convex portion (conical portion main body 41) of the third member is S2, S1 / S2 is 10% or more and 20% or less.

[0046] The area S1 can also be said to be the value obtained by subtracting the cross-sectional area of the conical portion main body 21 of the second member 20 at that position from the area of the lower opening 33 of the first member 30. The area S2 can also be said to be the sum of the areas of the flange openings 43.

[0047] The lower limit of S1 / S2 is preferably 12% or more, and more preferably 14% or more. The upper limit of S1 / S2 is preferably 18% or less, and more preferably 16% or less. By setting S1 / S2 within such a numerical range, the flow path of the powder P (i.e., the range where the powder P exists) at the lower opening 33 of the first member 30 can be made smaller than the flow path of the powder P (i.e., the range where the powder P exists) at the bottom surface of the third member 40. As a result, the powder P can be concentrated more towards the lower side. Further, since the third member 40 functions as a baffle plate, sufficient time can be ensured until the powder P accumulates, and by reducing the flow path, the air contained in the powder P can be further reduced.

[0048] As described above, according to the present embodiment, by the first member 30, the second member 20, and the third member 40 functioning as baffle plates, the time for the powder P to fall can be ensured, and the air contained in the powder P can be reduced. As a result, the occurrence of flashing can be suppressed. According to the powder supply device 1 having the hopper 10 having the powder contact portion 12 (the first member 30, the second member 20, and the third member 40), the feeder 80, and the mass measuring device 90, the blurring of the mass measurement accompanying the stable fall of the powder P can be suppressed.

[0049] <Summary of the features and functions of the hopper 10 and the powder supply device 1> The features of the hopper 10 and the powder supply device 1 of the first and second embodiments will be briefly summarized and described. 1. A receiving portion 11c for receiving the powder P, A feeding portion 11d located below the receiving portion 11c for feeding the powder P to the feeder 80, A powder contact portion 12 located between the receiving portion 11c and the feeding portion 11d and against which the powder P hits during the fall, The powder contact portion 12 Is a cylindrical member communicating vertically, and the inner surface thereof has a reduced diameter towards the lower side, and a first member 30 against which the powder P hits on the inner surface, Is located between the first member 30 and the feeding portion 11d, has a first convex portion (cone portion main body 21) having a reduced diameter towards the upper side, and a second member 20 against which the powder P passing through the first member 30 hits on the surface of the first convex portion (cone portion main body 21), having, A hopper 10, wherein a first flow path (flange opening 23) for dropping the powder P toward the feeding portion 11d is provided around the bottom surface of the first convex portion (cone body 21). 2. The hopper 10 according to 1., wherein the tip of the first convex portion (cone body 21) enters the lower opening (lower opening 33) of the first member 30 without contacting the first member 30. 3. The powder contact portion 12 further has a third member 40 having a second convex portion (cone body 41) that tapers upward between the receiving portion 11c and the first member 30, The hopper 10 according to 1. or 2., wherein a second flow path (flange opening 43) for dropping the powder P toward the first member 30 is provided around the bottom surface of the second convex portion (cone body 41). 4. When the area of the gap between the first member 30 and the second member 20 at the same height as the lower opening (lower opening 33) of the first member 30 is S1, and the area of the second flow path (flange opening 43) at the same height as the bottom surface of the second convex portion (cone body 41) is S2, The hopper 10 according to 3., wherein S1 / S2 × 100 (%) is 10% or more and 20% or less. 5. The hopper 10 according to 1. or 2., wherein the bottom surface of the first convex portion (cone body 21) of the second member 20 covers the lower opening (lower opening 33) of the first member 30 when viewed from below. 6. The hopper 10 further has a fourth member (straight pipe 50) that is a straight pipe above the powder contact portion 12, The hopper according to 1. or 2., wherein the fourth member (straight pipe 50) is centered with the first member 30 in a top view. 7. The hopper 10 according to 1. or 2., a feeder 80 that receives the powder P by the hopper 10 and supplies the powder P to the outside, A mass measuring device 90 that measures the mass changes of the hopper 10 and the feeder 80 and measures the mass of the powder P supplied from the feeder 80 to the next process, The powder supply device 1 having

[0050] As mentioned above, the embodiments of the present invention have been described, but these are examples of the present invention, and various configurations other than the above can also be adopted.

Explanation of reference numerals

[0051] 1 Powder supply device 10 Hopper 11 Hopper body 11c Receiving part 11d Feeding part 12 Powder contact part 20 Second member 21 Cone body 22 Flange part 23 Flange opening 24 Flange bridge part 30 First member 31 Funnel body 32 Flange part 33 Lower opening 34 Upper opening 40 Third member 41 Cone body 42 Flange part 43 Flange opening 50 Straight pipe 80 Feeder 90 Mass measuring device

Claims

1. A receiving portion for receiving the powder; a sending section located below the receiving section and configured to send the powder to a feeder; a powder contact portion located between the receiving portion and the feeding portion and contacted by the powder while falling, The powder contact portion is a first member which is a cylindrical member that is connected vertically, the diameter of the inner surface of which decreases toward the lower side, and the powder comes into contact with the inner surface; a second member located between the first member and the feed section, the second member having a first convex portion whose diameter decreases toward the upper side, the second member being contacted by powder having passed through the first member on a surface of the first convex portion; having a first flow path is provided around a bottom surface of the first convex portion to allow the powder to fall toward the feed section, a tip end of the first protrusion is inserted into a lower opening of the first member without contacting the first member, The powder contact portion is a third member having a second protrusion having a diameter decreasing toward an upper side, the third member being disposed between the receiving portion and the first member; a second flow path is provided around a bottom surface of the second convex portion to allow the powder to fall toward the first member, When an area of ​​the gap between the first member and the second member at the same height as the lower opening of the first member is S1 and an area of ​​the second flow path at the same height as the bottom surface of the second convex portion is S2, S1 / S2×100(%)=10% or more and 20% or less, hopper.

2. The powder contains one or more selected from the group consisting of silica, crystalline zeolite, and calcium oxide, 2. The hopper according to claim 1, wherein the powder has an average particle size of 0.01 μm or more and 50 μm or less.

3. A hopper as described in claim 1 or 2, wherein the powder has a spray index of 60 or more and 100 or less.

4. 3. The hopper according to claim 1, wherein, when viewed from below, a bottom surface of the first protrusion of the second member covers a lower opening of the first member.

5. 3. The hopper according to claim 1, further comprising a fourth member which is a straight pipe and is disposed above the powder contact portion.

6. A hopper according to claim 1 or 2; a feeder that receives the powder from the hopper and supplies the powder to an outside; a mass measuring device that measures a change in mass between the hopper and the feeder and measures a mass of the powder supplied from the feeder to a next process; A powder supplying device comprising:

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