JP2012143763A - Kneader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a kneader improved in wear resistance of its kneading member, and capable of excellently and efficiently kneading and transferring a material to be kneaded.SOLUTION: In the kneader transferring a material to be kneaded while powders are kneaded with its kneading member by rotating a rotary shaft installed on its outer peripheral surface with the kneading member, a hardened padding 32 is provided on the upper end surface 30a of the kneading member and a notched recess part 30d is formed on the upper end surface part of the transferring surface of the kneading member where a hardened padding is also provided. In this case, the padding treatment is performed in such a way that a padding surface extends to the transferring surface over the notched recess part and that a step d' is formed between a transfer side padding surface 32a and a kneaded-material transfer surface 30b. In such a structure, the wear resistance of a rod is improved, and kneading and transferring are effectively performed without peeling off the hardened padding.

Description

  The present invention relates to a kneading apparatus, in particular, a rotating shaft having a kneading member such as a rod, paddle, or screw blade on its outer peripheral surface is rotated to knead a material to be kneaded such as a powder or a mixture of the powder and the liquid by the kneading member. The present invention relates to a kneading apparatus that conveys a kneaded material.

  In garbage incinerators, in order to detoxify the fly ash collected from the flue gas generated during incineration, the fly ash, activated carbon powder for dioxin adsorption, acid gas neutralizer, or solidifying cement, etc. The powder is kneaded with a liquid such as a mixed solution obtained by mixing a chemical solution for preventing elution of heavy metals and water for dilution, and the kneaded product is solidified into an irregular shape or lump.

  For the kneading, the above-mentioned type of kneading apparatus is used, and the powder charged from the charging port is stirred by a kneading member of a rotating rotating shaft to become a kneaded product. By arranging the kneading members in a spiral shape, the kneaded material is conveyed to the discharge port side and discharged therefrom (Patent Document 1).

  By the way, since the powder and the kneaded material collide violently on the end surface (upper end surface) or the conveying surface of the kneading member and wear occurs, the wear portion such as the upper end surface or the conveying surface of the kneading member is subjected to an abrasion resistance treatment. For example, a hardening build-up process is performed, and the wear resistance of the kneading member is improved.

JP 2004-105840 A

  However, the cured build-up is applied to the wear part such as the upper end surface or the conveying surface of the kneading member, and the wear part is flat, and therefore the build-up part is peeled off depending on how the hardened metal is melted. In order to prevent this, if the build-up part is made high (thick), it becomes easy to receive the impact of the kneaded product, and the factor of peeling increases.

  In addition, when the build-up is applied to the conveying surface of the kneading member, when the kneaded product is conveyed, the kneaded product is caught by the protruding portion of the build-up, so the base material below the protruding portion is scraped off, There is a disadvantage that the wear of the base material is accelerated.

  The present invention has been made to solve the above-described problems, and provides a kneading apparatus capable of improving the wear resistance of a kneading member and kneading and conveying a material to be kneaded well and efficiently. The task is to do.

The present invention
A kneading apparatus that rotates a rotating shaft provided with a kneading member on an outer peripheral surface and conveys a kneaded material while kneading powder by the kneading member,
Forming a notch recess in the upper end surface portion of the kneaded material conveying surface continuous with the upper end surface of the kneading member, and further curing and building up the upper end surface and the notch recess,
The cured build-up process is performed such that the build-up surface extends beyond the bottom surface of the notch to the transport surface, and a step is formed between the transport-side build-up surface and the transport surface. Features.

The present invention also provides:
A kneading apparatus that rotates a rotating shaft provided with a kneading member on an outer peripheral surface and conveys a kneaded material while kneading powder by the kneading member,
Forming a notch recess in the upper end surface portion of the kneaded material conveying surface continuous with the upper end surface of the kneading member, and further curing and building up the upper end surface and the notch recess,
The notch recess is also formed on a surface symmetrical to the kneaded material conveyance surface, and a hardening build-up process is performed on the notch recess on both sides.

  In the present invention, since the cured build-up process is performed on the worn part of the kneading member, the wear resistance of the kneading member is improved and the cured build-up is not peeled off. It becomes possible to perform efficiently.

It is a top view shown in the state where most of the upper side of the case of the kneading apparatus in the embodiment of the present invention was removed. It is a side view along one rotating shaft in the housing | casing of the kneading apparatus. (A) is a perspective view of a hardened rod as a kneading member, (b) is a longitudinal sectional view thereof, and (c) is a sectional view taken along line X-X ′ of (a). The perspective view of the rod which gave the hardening build-up on the both sides of the rod, (b) is the longitudinal cross-sectional view, (c) is sectional drawing along X-X 'of (a). It is the perspective view which showed in part the cross section the screw wing which piled up the hardening as a kneading member. It is sectional drawing which shows the other Example of the screw feather piled up by hardening. FIG. 3 is a perspective view of a paddle with hardened build-up as a kneading member. It is sectional drawing which shows the other Example of the paddle by which the hardening buildup was carried out.

  Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

  1 and 2 illustrate a kneading apparatus according to an embodiment of the present invention, and the kneading apparatus is disposed on a base frame 2. On the upper side (FIG. 2) of the right end portion of the casing 1 of the kneading apparatus is a powder such as fly ash, activated carbon powder for dioxin adsorption, and slaked lime for sulfuric acid neutralization or cement for solidification from a hopper (not shown). Is provided in the housing 1 and a fly ash kneaded product obtained by kneading powder, a mixed solution of a chemical solution and water for dilution at the lower side of the left end portion is provided. Is provided on the conveyor (not shown).

  In the housing 1, two rotating shafts 3 and 4 that rotate at non-constant speeds in opposite directions via gears 11 and 12 are provided with bearings 5 and 6 and two bearings 7 fixed to the gear case 9. , 8 are rotatably supported. The rotating shafts 3 and 4 are rotated at a non-uniform speed, for example, at a ratio of 5: 4.

  In the rotary shafts 3 and 4, the portions immediately below the input port 1 a are screw portions 3 a and 4 a having a larger diameter than the portion on the discharge port 1 b side, and the outer peripheral surfaces of the screw portions 3 a and 4 a are respectively Screw wings 3b and 4b formed in a continuous spiral shape with a predetermined pitch along the axial direction of the rotary shafts 3 and 4 are provided. The diameters of the screw portions 3a and 4a are the same, and the diameters of the screw blades 3b and 4b are also the same. However, the spiral winding directions of the screw blades 3b and 4b are opposite to each other, and the pitch ratio of the screw blades 3b and 4b is 1: 1.25, which is the reverse ratio of the rotation ratio of the rotary shafts 3 and 4. It has become.

  A plurality of rods 3c and 4c as kneading members are provided in the axial direction of the rotary shafts 3 and 4 in the portion from the screw portions 3a and 4a of the rotary shafts 3 and 4 to the vicinity of the discharge port 1b on the discharge port 1b side. They are erected vertically with respect to the outer peripheral surfaces of the rotary shafts 3 and 4 so as to be arranged in a spiral shape in a direction opposite to each other at a pitch (interval) of a predetermined distance and a pitch of a predetermined angle in the circumferential direction. The diameters of the portions of the rotary shafts 3 and 4 provided with the rods 3c and 4c are the same, the dimensions of the rods 3c and 4c are the same, and the pitches of the rods 3c and 4c in the axial direction of the rotary shafts 3 and 4 are also the same. It is. However, the angular pitches of the rods 3c and 4c in the circumferential direction of the rotary shafts 3 and 4 are different, and the angular pitch ratio is an angular pitch ratio of 45 °: 36 ° which is the same ratio as the rotary shafts 3 and 4. ing. Only one rod 3c, 4c is provided in the rotary shafts 3, 4 until halfway before the discharge port 1b, but a plurality of rods 3c, 4c are provided in the vicinity of the discharge port 1b.

  The frame 2 is provided with a motor 14, and when the motor 14 rotates, the rotation is transmitted to the rotating shaft 3 through the cyclo reducer 15, the sprocket 16, the chain 17 and the sprocket 13, so that the rotating shaft 3 is integrated. The rotating shaft 4 rotates in the opposite direction via the gears 11 and 12.

  Further, as shown in FIG. 2, the kneading apparatus is provided with a pipe (nozzle) 18 for injecting a mixed solution obtained by mixing a chemical solution for preventing heavy metal elution and water for dilution.

  By the way, in the above structure, the screw blade 3b scrapes off the powder adhering to both the outer peripheral surface of the screw part 4a and both surfaces of the screw blade 4b at the time of the kneading | mixing mentioned later, and the screw blade 4b is the outer peripheral surface of the screw part 3a and the screw blade 3b. Self-cleaning to scrape off the powder adhering to both sides of the rod, and the fly ash kneaded product in which the rod 3c adheres to the outer peripheral surface of the rotating shaft 3 by scraping off the fly ash kneaded material adhering to the outer peripheral surface of the rotating shaft 4 Self-cleaning to scrape off is performed.

  For this reason, the rotary shafts 3 and 4 have the screw blades 3b and 4b in between each other, the tip of the screw blade 3b is the outer peripheral surface of the screw portion 4a, and the tip of the screw blade 4b is the outer peripheral surface of the screw portion 3a. Are arranged so that the tip of the rod 3c is substantially in contact with the outer peripheral surface of the rotary shaft 4, and the tip of the rod 4c is substantially in contact with the outer peripheral surface of the rotary shaft 3. .

  Although not shown in FIGS. 1 and 2 for the sake of complexity, the worn portion of the rod as a kneading member is subjected to a hardening build-up process as shown in FIG. 3A is a perspective view of the rod 20, FIG. 3B is a longitudinal sectional view thereof, and FIG. 3C is a sectional view taken along line X-X ′ of FIG. The rod 20 corresponds to the rod 3c or 4c in FIGS. 1 and 2, and in FIG. 3, the upper side is a portion attached to the upper end surface of the rod and the lower end is attached to the rotary shaft 3 or 4.

  As is clear from FIGS. 3A, 3B and 3C, the upper end surface 20a of the rod 20 and the kneaded material conveying surface 20b of the rod continuous with the upper end surface 20a are subjected to a hardening build-up process. The rod 20 is made of carbon steel (S45C), chromium-molybdenum steel (SCM440), stainless steel (SUS304), etc., and the hardfacing contains 80% tungsten carbide with the rod 20 as a base material. This is done by inclining a wear-resistant hard cladding rod (for example, Elastodur 8811 (trade name)) 30 ° to 40 ° from the base material surface, attaching the tip of the hard cladding rod to the base material, and applying a flame to perform gas welding. Is called.

  The rod 20 has a notch recess 20c at a predetermined depth d (FIG. 3B) in an upper end surface portion corresponding to the conveying surface 20b, and an arc shape corresponding to the conveying surface for conveying the kneaded material. Since it is formed in (FIG. 3C), the cured build-up 21 is applied to the entire cutout recess 20c covering the upper end surface 20a. At that time, the hardening build-up process is performed so that the build-up surface 21a hardened and built up in the notch recess 20c and the transport surface 20b are the same surface, that is, the icicle position. In this way, by performing the cured build-up so that the build-up surface and the transport surface are at the same surface position, there is no step (level difference) on both surfaces, so the kneaded product is smoothly conveyed and the kneaded product is stepped. Wear on this part of the base metal can be reduced. Further, since the cured build-up is also applied to the cutout recess 20c, the welding strength of the hard build-up to the rod is improved, and the height h from the upper end surface 20a of the cured build-up 21 can be reduced. Therefore, it is possible to prevent the cured build-up 21 from being peeled off by impact with the kneaded product.

  In the kneading apparatus, there is a type of mode in which the rotation shafts 3 and 4 are reversed in the middle of conveyance and the conveyance direction is reversed. In such a kneading apparatus, the rod has a conveyance surface shown in FIG. There is also a transport surface on a plane that is symmetrical to the surface. Therefore, as shown in FIGS. 4A, 4B, and 4C, arc-shaped notch recesses 20d and 20e are formed in the portions corresponding to both conveying surfaces of the upper end surface 20a of the rod 20, Hardening 22 is given to end face 20a and both notch crevices 20d and 20e. At this time, unlike the case of FIG. 3, no hardening is performed at the center of the upper end surface. Others are the same as in the case of FIG. 3, and the same effect can be obtained as in the case where a similar hardening build-up is performed on the reverse conveying surface in FIG.

  As described above, kneading is performed not only with the cylindrical rod but also with the screw blades. Therefore, as shown in FIG. The screw blades 30 correspond to the screw blades 3b and 4b in FIGS. 1 and 2, and the lower part in FIG. 5 is a part attached to the rotary shaft 3 or 4.

  As in the case of the rod, a notch recess 30c is formed on the upper end surface 30a of the screw wing on the upper end surface portion corresponding to the conveying surface 30b of the screw wing and is formed over the entire conveying surface at a predetermined depth. The build-up 31 is applied to the upper end surface 30a and the notch recess 30c. At that time, the hardening build-up process is performed so that the build-up surface 31a hardened and built up in the notch recess 30c and the conveying surface 30b of the screw blade 30 are at the same surface position without any step. Thereby, the same effect as described in the embodiment of the rod can be obtained.

  Further, as shown in FIG. 6, the notch recess 30d formed in the screw blade 30 is made shallower than the notch recess 30c shown in FIG. 5, and the cured build-up 32 is formed on the upper end surface 30a and the notch recess. Apply to 30d. At this time, the cured build-up 32 is performed so as to extend beyond the bottom surface of the notch recess 30 d to the transport surface 30 b, and a step d ′ is provided between the transport-side surface 32 a of the hard buildup and the transport surface 30 b of the screw blade 30. I will let you. In this case, it is possible to improve the wear resistance at the corner of the screw wing (upper left corner in FIG. 6) and the strength of the cured build-up at this portion. In this case, in order to reduce the wear of the screw blades at that portion, the hardened overlay is performed so that the step d 'is as small as possible.

  Further, the kneading member may be a plate-like paddle 40 as shown in FIG. In the case of paddles, similarly to rods and screw blades, a notch recess 40c is formed on the upper end surface 40a of the paddle 40 at the upper end surface portion corresponding to the conveyance surface 40b, and has a predetermined depth over the entire conveyance surface. A cured build-up 41 is formed and applied to the upper end surface 40a and the cutout recess 40c. At that time, the hardening build-up process is performed so that the build-up surface 41a hardened and built up in the notch recess 40c and the transport surface 40b of the paddle 40 are at the same surface position. As a result, the same effect as described for the rod or screw blade is obtained.

  Further, as shown in FIG. 8, the notch recess 40d formed in the paddle 40 is made shallower than the notch recess 40c shown in FIG. 7, and the cured build-up 42 is formed on the upper end surface 40a and the notch recess 40d. To apply. At this time, the cured build-up 42 is performed so as to extend beyond the bottom surface of the cutout recess 40 d to the transport surface 40 b, so that a slight step is provided between the transport-side surface 42 a of the cured build-up and the transport surface 40 of the paddle 40. Like that. In this case, the same effect as described for the screw blades in FIG. 6 can be obtained.

  Also in the case of plate-like screw blades and paddles, in the kneading apparatus in which the opposite surface to the conveyance surfaces 30b and 40b is also the conveyance surface, both the conveyance surfaces are subjected to a hardening build-up process as in the case of FIG. .

  In such a kneading apparatus, the charged powder is conveyed to the discharge port 1b while being kneaded by the screw blades 3b and 4b, and the powder is mixed with the liquid mixture from the nozzle 18 and kneaded by the rods 3c and 4c. Further, it is sent to the discharge port 1b side and discharged from the discharge port 1b onto the conveyor.

  The worn portions of the screw blades 3b and 4b and the rods 3c and 4c are subjected to the above-described cured build-up process, so that the wear resistance of the kneading member is improved and the cured build-up is not peeled off. The kneaded product can be kneaded and transported satisfactorily and efficiently.

  In the above-described embodiment, the hardening is performed on the kneading member attached to the two rotating shafts rotating in reverse at an infinite speed. However, the kneading member is attached to the one rotating shaft in a spiral shape. The same hardening build-up can be performed on the kneading member of the kneading apparatus that is transported, and the same effect can be obtained.

DESCRIPTION OF SYMBOLS 1a Input port 1b Discharge port 3,4 Rotating shaft 3b, 4b Screw blade 3c, 4c Rod 14 Motor 20 Rod 21, 22 Hardening 30 Screw blade 31, 32 Hardening 40 Paddle 41, 42 Hardening

Claims (2)

A kneading apparatus that rotates a rotating shaft provided with a kneading member on an outer peripheral surface and conveys a kneaded material while kneading powder by the kneading member,
Forming a notch recess in the upper end surface portion of the kneaded material conveying surface continuous with the upper end surface of the kneading member, and further curing and building up the upper end surface and the notch recess,
The cured build-up process is performed such that the build-up surface extends beyond the bottom surface of the notch to the transport surface, and a step is formed between the transport-side build-up surface and the transport surface. A kneading device characterized. A kneading apparatus that rotates a rotating shaft provided with a kneading member on an outer peripheral surface and conveys a kneaded material while kneading powder by the kneading member,
Forming a notch recess in the upper end surface portion of the kneaded material conveying surface continuous with the upper end surface of the kneading member, and further curing and building up the upper end surface and the notch recess,
The notch recess is also formed on a surface symmetrical to the kneaded material conveyance surface, and a curing build-up process is performed on the notch recess on both sides.

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