CN112337576A - Sand making machine impeller and mounting structure thereof - Google Patents
Sand making machine impeller and mounting structure thereof Download PDFInfo
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- CN112337576A CN112337576A CN202011113814.8A CN202011113814A CN112337576A CN 112337576 A CN112337576 A CN 112337576A CN 202011113814 A CN202011113814 A CN 202011113814A CN 112337576 A CN112337576 A CN 112337576A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
- B02C13/28—Shape or construction of beater elements
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Abstract
The invention discloses a sand making machine impeller and its mounting structure, including: the wall panel comprises an upper main body plate, a lower main body plate and a plurality of wall panels, wherein the upper main body plate and the lower main body plate are in the same shape and size; each wall plate is arranged at equal intervals, and each wall plate is provided with a set of wear-resistant throwing kit; the upper main body plate and the lower main body plate are both circular plates, and a circular feeding barrel is arranged in the middle of the upper main body plate; the feeding barrel is characterized in that the number of the wall plates is four, the radius ratio of the feeding barrel to the upper main body plate is 1:2.0-2.5, and the ratio of the height between the upper main body plate and the lower main body plate to the radius of the feeding barrel is 1.0-1.5: 1. The invention ensures that the feeding and discharging of the impeller of the whole sand making machine are very balanced, and the sand making effect is good; and make wear-resisting external member also increase, the wear of single set of wear-resisting external member is littleer to effectively increase wear-resisting external member's life.
Description
Technical Field
The invention relates to the technical field of sand making machines, in particular to a sand making machine impeller and an installation structure thereof.
Background
The sand making machine is widely used for finely crushing and shaping metal and non-metal ores, building aggregates, artificial sand and various metal slags. The impeller is a key part of a sand making machine, the impeller manufactured in the prior art generally comprises a cavity, a material distribution cone, chute plates, a feeding hole, a discharging hole, a material throwing head, a counterattack block and other components are arranged in the cavity, after materials enter the cavity through the feeding hole, the materials are uniformly distributed to the chute plates of the impeller through the material distribution cone at the center of the cavity, and the materials are ejected through the chute plates and the discharging hole through the rotation of the impeller.
At present, the common impeller of the sand making machine is generally in a three-cavity structure, as described in the chinese patent publication No. CN 204816776U. In order to improve the yield, the diameter of the impeller is increased, and the number of cavities is increased. However, when the number of the cavities is increased, the balance of feeding and discharging of the whole impeller is also deteriorated, so that the impeller is limited to reach the rotating speed, and the yield is improved extremely limitedly. In addition, in the prior art, the material in the feed hopper generally enters the crushing cavity directly, as disclosed in the patent of the invention of China with the publication number of CN 104772188A. When the existing structure is used for feeding, the outer main body of the impeller is easily abraded by the impact of materials, and the feeding uniformity is not ideal.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide the four-cavity sand making machine impeller with good feeding and discharging balance.
The invention also aims to provide a sand making machine impeller mounting structure which can enhance the feeding uniformity of the impeller, avoid the abrasion of the impeller main body by materials and has better safety
In order to achieve the purpose, the invention adopts the following technical scheme.
A sander impeller comprising: the wall panel comprises an upper main body plate, a lower main body plate and a plurality of wall panels, wherein the upper main body plate and the lower main body plate are in the same shape and size; each wall plate is arranged at equal intervals, and each wall plate is provided with a set of wear-resistant throwing kit; the upper main body plate and the lower main body plate are both circular plates, and a circular feeding barrel is arranged in the middle of the upper main body plate; the feeding barrel is characterized in that the number of the wall plates is four, the radius ratio of the feeding barrel to the upper main body plate is 1:2.0-2.5, and the ratio of the height between the upper main body plate and the lower main body plate to the radius of the feeding barrel is 1.0-1.5: 1.
More preferably, the ratio of the radius of the feeding barrel to the radius of the upper body plate is 1:2.1, and the ratio of the height between the upper body plate and the lower body plate to the radius of the feeding barrel is 1.4: 1.
More preferably, the wear-resistant throwing kit comprises: the knife plate and the vertical guard plate are positioned on the same side of the wallboard, and the impact plate is positioned on the other side of the wallboard; the vertical guard plate is a trapezoidal plate with a wide upper end and a narrow lower end; the impact block plate is formed by splicing a plurality of split units, and the positions of the two split units positioned at the uppermost side and the lowermost side can be subjected to intermodulation; the surface of the impact plate is provided with a convex edge; the cutting board comprises a base body and an alloy strip embedded in the base body, the surface of the alloy strip is a working surface of the cutting board, one side, which is firstly contacted with a material, of the working surface is an impact side, and the working surfaces of the base body and the alloy strip are arc-shaped and protruded towards the impact side.
More preferably, the maximum thickness of the arc-shaped bulge of the base body and the working surface of the alloy strip towards the impact side exceeds 10% of the total thickness.
More preferably, the alloy strip is a sectional type hard alloy strip; copper powder is filled between the alloy strip and the substrate, and the alloy strip and the substrate are fixed through copper powder in a brazing mode.
A sand making machine impeller mounting structure for mounting a sand making machine impeller as described above, comprising: the impeller lid sets up protect mouthful circle, side support, go up drum and drum on the impeller lid the middle part of impeller lid be equipped with system sand machine feeder hopper with the through-hole that the feed bucket of system sand machine impeller corresponds, protect mouthful to enclose and install on the through-hole and with the feed bucket cooperation, the side support is used for realizing the fixed of impeller lid and broken chamber, it is located to go up the drum the upper surface of impeller lid centers on protect mouthful circle setting, the drum is located down the lower surface cover of impeller lid is in system sand machine impeller's periphery.
More preferably, the impeller cover is provided with wear resistant layers on both the upper and lower surfaces thereof.
More preferably, the guard ring is fixed to the impeller cover by a plurality of bolts.
More preferably, the number of the side supports is at least three, each side support and the impeller cover are welded, fixed by bolts or integrally formed, and the outer end of each side support is provided with a mounting and fixing hole for connecting a crushing cavity.
More preferably, the upper cylinder, the lower cylinder and the impeller cover are of an integrally formed structure or a welded and fixed structure, the size of the upper cylinder is smaller than that of the lower cylinder, and the side bracket is fixed on the upper side of the impeller cover. .
The invention has the beneficial effects that:
one, through setting up four wallboard that the interval was arranged, and then form four cavitys, match through the size and the feed bucket size to the cavity simultaneously for the feeding ejection of compact of whole system sand machine impeller is very balanced, and system sand is effectual. In addition, compared with the traditional three-cavity sand making machine impeller, the abrasion-resistant sleeve is increased due to the fact that the cavities are increased synchronously, and the abrasion of a single abrasion-resistant sleeve is smaller, so that the service life of the abrasion-resistant sleeve is effectively prolonged.
Secondly, the working surfaces of the base body and the alloy strip are protruded towards the impact side in an arc shape, and the protruded thicknesses exceed 10% of the total thickness; the wear-resisting property of the working surface of the cutting board can be effectively improved, so that the service life of the cutting board is long, and the running cost of the sand making machine is reduced. Tests prove that compared with the traditional rectangular cutting board, the cutting board adopted in the invention has the service life prolonged by more than 2.5 times. In addition, the knife board adopted by the invention has higher strength and can increase the rotating speed of the impeller, thereby improving the overall yield and saving the cost.
Thirdly, the impeller cover of the sand making machine is arranged at the lower part of the feed hopper and the upper part of the impeller of the sand making machine, and is covered on the integral impeller through the lower cylinder; the material in the feed hopper can only enter the impeller through the mouth protecting ring, so that the outer main body of the impeller can be protected from being abraded by the material during feeding; meanwhile, the lower cylinder can also increase the cavity strength of the crushing cavity; in addition, the mouth protecting ring guides central feeding and forms waterfall edge feeding with surrounding gaps, so that materials enter the crushing cavity to be crushed uniformly. Particularly, the impeller cover is stably fixed above the crushing cavity through the side support, so that the damage of a machine can be effectively avoided in the operation of equipment, and meanwhile, when the impeller rotates at a high speed, if the impeller falls off and is about to fly out of the crushing cavity, accidents can be effectively avoided.
Drawings
FIG. 1 shows a longitudinal cross-sectional view of a sander impeller provided by the present invention.
FIG. 2 shows a longitudinal cross-sectional view of a sander impeller provided by the present invention.
Fig. 3 is a schematic structural view of the knife plate.
Fig. 4 is a schematic view of the working surface of the cutting board.
Fig. 5 is a schematic view showing an installation structure of the knife plate and the impeller body.
Fig. 6 is a schematic structural view of the standing plate.
FIG. 7 is a schematic view showing the structure of the impact plate.
Fig. 8 is a schematic structural view of an impeller cover.
Fig. 9 shows a schematic cross-sectional view of the impeller cover.
Description of reference numerals:
1: upper main body plate, 2: lower body panel, 3: wallboard, 4: wear-resisting casting external member, 5: feed barrel, 6: impeller main body, 7: impeller cover, 8: mouth guard ring, 9: side support, 10: upper cylinder, 11: lower cylinder, 12: bolt, 13: and installing a fixing hole.
4-1: cutting board, 4-2: vertical guard plate, 4-3: impact the plate.
4-1-1: matrix, 4-1-2: alloy strip, 4-1-3: and (7) protecting the board.
4-3-1: split unit, 4-3-2: and (7) a rib.
Detailed Description
In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated without limiting the specific scope of protection of the present invention.
Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, a definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the feature, and in the description of the invention, "at least" means one or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "assembled", "connected", and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; the two elements can be directly connected or connected through an intermediate medium, and the two elements can be communicated with each other. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
In the present invention, unless otherwise specified and limited, "above" or "below" a first feature may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other through another feature therebetween. Also, the first feature being "above," "below," and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply an elevation which indicates a level of the first feature being higher than an elevation of the second feature. The first feature being "above", "below" and "beneath" the second feature includes the first feature being directly below or obliquely below the second feature, or merely means that the first feature is at a lower level than the second feature.
The following describes the embodiments of the present invention with reference to the drawings of the specification, so that the technical solutions and the advantages thereof are more clear and clear. The embodiments described below are exemplary and are intended to be illustrative of the invention, but are not to be construed as limiting the invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Example 1
As shown in fig. 1 and 2, a sand making machine impeller includes: the wall plate comprises an upper main body plate 1, a lower main body plate 2 and a plurality of wall plates 3, wherein the upper main body plate 1 and the lower main body plate 2 are consistent in shape and size; the wall plates 3 are arranged at equal intervals, and a set of wear-resistant throwing sleeve 4 is arranged on each wall plate 3; the upper main body plate 1 and the lower main body plate 2 are both circular plates, and a circular feeding barrel 5 is arranged in the middle of the upper main body plate 1; the wall plate feeding device is characterized in that the number of the wall plates 3 is four, the radius ratio of the feeding barrel 5 to the upper main body plate 1 is 1:2.1, and the ratio of the height between the upper main body plate 1 and the lower main body plate 2 to the radius of the feeding barrel 5 is 1.4: 1.
The utility model provides a system sand machine impeller, through setting up the wallboard that four intervals were arranged, and then form four cavitys, match through size and the feeder bucket size to the cavity simultaneously for the feeding ejection of compact of whole system sand machine impeller is very balanced, and system sand is effectual. In addition, compare with three chamber system sand machine impellers of tradition, this embodiment makes wear-resisting external member also increase because of the cavity increases in step, and the wear of single set of wear-resisting external member is littleer to effectively increase wear-resisting external member's life. Of course, according to different actual needs, the radius ratio of the feeding barrel to the upper main body plate is properly adjusted to be 1: 2-2.5; the ratio of the height between the upper main body plate and the lower main body plate to the radius of the feeding barrel is properly adjusted to be 1-1.5: 1; substantially similar technical effects can be achieved, and are not limited to the present embodiment.
Referring again to fig. 2, the wear-resistant throwing kit 4 includes: the cutting board 4-1 is arranged at one end of the wallboard 3, the vertical protection board 4-2 and the impact board 4-3 are arranged at the other end of the wallboard 3, the cutting board 4-1 and the vertical protection board 4-2 are positioned at the same side of the wallboard 3, and the impact board 4-3 is positioned at the other side of the wallboard 3; the knife plate 4-1, the vertical protection plate 4-2 and the impact plate 4-3 are respectively fixed on an impeller of a sand making machine through corresponding bolts. When the material crusher works practically, the material impacts the cutter plate 4-1 to form primary crushing, then is thrown outwards to the periphery of the impeller, impacts the vertical protection plate 4-2 again to form secondary crushing, and then rebounds to the impact plate 4-3 to perform tertiary crushing; in all crushing processes, mutual collision between materials can be generated, and excellent material particle types are achieved.
Referring to fig. 3 and 4, the cutting plate 4-1 comprises a base body 4-1-1 and an alloy strip 4-1-2 embedded in the base body 4-1-1, the surface of the alloy strip 4-1-2 is a working surface of the cutting plate 4-1, the side of the working surface, which first contacts with a material, is an impact side, the working surfaces of the base body 4-1-1 and the alloy strip 4-1-2 are both arc-shaped and convex towards the impact side, and the maximum convex thickness is more than 10% of the total thickness of the cutting plate. The advantage of setting up like this can effectively improve the wear resistance of cutting board working face to make the long service life of cutting board 4-1, reduce the running cost of system sand machine. Experiments prove that compared with the traditional rectangular cutting board, the cutting board adopted in the embodiment has the service life prolonged by more than 2.5 times. In addition, the knife plate 4-1 adopted by the embodiment has higher strength and can increase the rotating speed of the impeller, so that the overall yield is improved, and the cost is saved.
In this embodiment, copper powder is filled between the alloy strip 4-1-2 and the base 4-1-1, and the copper powder is fixed by brazing. The alloy strip 4-1-2 and the substrate 4-1-1 are fixed by copper powder filled in the alloy strip through brazing, so that the cutting board 4-1 can be used more stably. Because the copper powder is lower than the melting temperature of the base metal, when the connected parts and the brazing filler metal are heated until the brazing filler metal is melted, the parts are connected by utilizing the wetting and spreading of the liquid brazing filler metal on the surface of the base metal, the mutual dissolution and diffusion of the liquid brazing filler metal and the base metal, and the wetting, capillary flow and joint filling in the gap between the base metals, and the mutual dissolution and diffusion of the base metals, and the connection strength is high.
In the present embodiment, the alloy strips 4-1-2 are preferably segmented cemented carbide strips. The sectional type hard alloy strip has the advantage that the problem of breakage of the alloy strip 4-1-2 caused by the difference of mechanical properties of the matrix 4-1-1 and the alloy strip 4-1-2 can be avoided. As for the specific segmentation method of the hard alloy strip, refer to the disclosure of chinese utility model patent No. CN207254419U, which is not further described herein.
In this embodiment, an L-shaped edge protection plate 4-1-3 is arranged on the knife plate 4-1, and after the knife plate 4-1 is fixed with the sand making machine impeller, the L-shaped edge protection plate 4-1-3 partially extends out of the impeller main body 6, as shown in fig. 5. Therefore, the periphery of the impeller main body 6 of the sand making machine is protected from being in direct contact with the crushed materials through the edge protection plates 4-1-3, and the service life of the impeller is prolonged.
Referring to fig. 6 and 7, the vertical protection plate 4-2 is a trapezoidal plate with a wide upper end and a narrow lower end. The impact block plate 4-3 is formed by splicing a plurality of split units 4-3-1, and the positions of the two split units 4-3-1 positioned at the uppermost side and the lowermost side can be subjected to intermodulation. Thus, when one of the upper and lower body units 4-3-1 is worn more severely, the upper and lower body units 4-3-1 can be reversed for continuous use, and the service life of the impact plate 4-3 is prolonged. Particularly, the convex edges 4-3-2 are arranged on the surface of the impact block plate 4-3, so that the wear resistance and the material crushing performance of the impact block plate 4-3 can be effectively improved, and the impact block plate has a more excellent material crushing effect.
Example 2
As shown in fig. 8 and 9, an impeller mounting structure of a sand making machine is characterized by comprising: impeller lid 7 sets up protect mouthful circle 8, side support 9, go up drum 10 and drum 11 on the impeller lid 7 the middle part of impeller lid 7 is equipped with the through-hole that corresponds with the feeder bucket of system sand machine feeder hopper and system sand machine impeller, protect mouthful circle 8 to install on the through-hole and with the feeder bucket cooperation, side support 9 is used for realizing the fixed of impeller lid 7 with broken chamber, go up drum 10 is located the upper surface of impeller lid 7 centers on protect mouthful circle 8 to set up, drum 11 is located down the lower surface cover of impeller lid 7 is in system sand machine impeller periphery.
According to the sand making machine impeller mounting structure provided by the embodiment, materials in the feed hopper can only enter the sand making machine impeller through the opening protecting ring 8, so that the outer main body of the sand making machine impeller can be protected from being abraded by the materials during feeding; meanwhile, the lower cylinder 10 can also increase the cavity strength of the crushing cavity; in addition, the mouth protecting ring 8 guides central feeding and forms waterfall edge feeding with surrounding gaps, so that materials enter the crushing cavity to be crushed uniformly. Particularly, the impeller cover 7 is stably fixed above the crushing cavity through the side bracket 9, so that the damage of a machine can be effectively avoided in the operation of equipment, and meanwhile, when the impeller rotates at a high speed, if the impeller falls off and is about to fly out of the crushing cavity, accidents can be effectively avoided.
To facilitate the implementation of the whole scheme, the following preferred schemes are adopted in the embodiment: preferably, the upper surface and the lower surface of the impeller cover 7 are both provided with wear resistant layers.
Preferably, the mouth guard ring 8 is fixed with the impeller cover 7 through a plurality of bolts 12, so that the mounting and dismounting are convenient, and the maintenance and the replacement of the mouth guard ring are facilitated.
Preferably, the number of the side brackets 9 is three, and the side brackets are uniformly welded and fixed on the periphery of the impeller cover 7, so that the structure is simple, and the connection is stable. Preferably, the outer end of each side bracket 9 is provided with a mounting and fixing hole 13 to facilitate the connection and the disconnection of the side bracket 9 and the crushing cavity. In other embodiments, the number of the side brackets may be four, five, or even more, according to different actual needs, and the side brackets and the impeller cover are integrally formed or bolted, but not limited to this embodiment.
Preferably, the upper cylinder 10 is smaller than the lower cylinder 11, and the side bracket 9 is fixed on the upper side of the impeller cover 7, so that the connecting area is large and the connecting strength is high.
Further, the upper cylinder 10, the lower cylinder 11 and the impeller cover 7 are preferably of an integrally formed or welded structure, and the structural strength is high.
It will be appreciated by those skilled in the art from the foregoing description of construction and principles that the invention is not limited to the specific embodiments described above, and that modifications and substitutions based on the teachings of the art may be made without departing from the scope of the invention as defined by the appended claims and their equivalents. The details not described in the detailed description are prior art or common general knowledge.
Claims (10)
1. A sander impeller comprising: the wall panel comprises an upper main body plate, a lower main body plate and a plurality of wall panels, wherein the upper main body plate and the lower main body plate are in the same shape and size; each wall plate is arranged at equal intervals, and each wall plate is provided with a set of wear-resistant throwing kit; the upper main body plate and the lower main body plate are both circular plates, and a circular feeding barrel is arranged in the middle of the upper main body plate; the feeding barrel is characterized in that the number of the wall plates is four, the radius ratio of the feeding barrel to the upper main body plate is 1:2.0-2.5, and the ratio of the height between the upper main body plate and the lower main body plate to the radius of the feeding barrel is 1.0-1.5: 1.
2. A sander impeller according to claim 1 wherein the ratio of the radius of the feed barrel to the upper body plate is 1:2.1 and the ratio of the height between the upper body plate and the lower body plate to the radius of the feed barrel is 1.4: 1.
3. A sander impeller according to claim 1, wherein the wear resistant fling kit comprises: the knife plate and the vertical guard plate are positioned on the same side of the wallboard, and the impact plate is positioned on the other side of the wallboard;
the vertical guard plate is a trapezoidal plate with a wide upper end and a narrow lower end;
the impact block plate is formed by splicing a plurality of split units, and the positions of the two split units positioned at the uppermost side and the lowermost side can be subjected to intermodulation; the surface of the impact plate is provided with a convex edge;
the cutting board comprises a base body and an alloy strip embedded in the base body, the surface of the alloy strip is a working surface of the cutting board, one side, which is firstly contacted with a material, of the working surface is an impact side, and the working surfaces of the base body and the alloy strip are arc-shaped and protruded towards the impact side.
4. A sand maker impeller according to claim 3 wherein the base, the working face of the alloy strip arcuately projecting maximum thickness to the impact side each exceeds 10% of the total thickness.
5. A sand maker impeller according to claim 3 wherein the alloy strip is a segmented cemented carbide strip; copper powder is filled between the alloy strip and the substrate, and the alloy strip and the substrate are fixed through copper powder in a brazing mode.
6. A sander impeller mounting structure for mounting a sander impeller according to any one of claims 1 to 5, comprising: the impeller lid sets up protect mouthful circle, side support, go up drum and drum on the impeller lid the middle part of impeller lid be equipped with system sand machine feeder hopper with the through-hole that the feed bucket of system sand machine impeller corresponds, protect mouthful to enclose and install on the through-hole and with the feed bucket cooperation, the side support is used for realizing the fixed of impeller lid and broken chamber, it is located to go up the drum the upper surface of impeller lid centers on protect mouthful circle setting, the drum is located down the lower surface cover of impeller lid is in system sand machine impeller periphery.
7. A sand maker impeller mounting structure according to claim 6, wherein a wear resistant layer is provided on both the upper and lower surfaces of the impeller cover.
8. A sand maker impeller mounting structure according to claim 6, wherein the grommet is secured to the impeller cover by a plurality of bolts.
9. A sand making machine impeller mounting structure as claimed in claim 6, wherein the number of the side brackets is at least three, each side bracket and the impeller cover are welded, bolted or integrally formed, and mounting and fixing holes for connecting the crushing chamber are formed at the outer end of each side bracket.
10. A sand making machine impeller mounting structure as claimed in claim 6, wherein the upper cylinder and the lower cylinder are of an integral structure or a welded and fixed structure with the impeller cover, the upper cylinder is smaller in size than the lower cylinder, and the side bracket is fixed on the upper side of the impeller cover.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011113814.8A CN112337576A (en) | 2020-10-17 | 2020-10-17 | Sand making machine impeller and mounting structure thereof |
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| CN202011113814.8A CN112337576A (en) | 2020-10-17 | 2020-10-17 | Sand making machine impeller and mounting structure thereof |
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Application publication date: 20210209 |