A food grade calcium hydroxide grinding equipment

Abstract

The invention relates to the technical field of calcium hydroxide processing, and specifically to a grinding device for food-grade calcium hydroxide, comprising a grinding tank, a grinding bin fixedly arranged in the grinding tank by a plurality of connecting columns, grinding balls rotatably arranged in the grinding tank, the gap between the outer wall of the grinding ball and the inner wall of the grinding bin decreases from top to bottom, a rotating shaft rod is fixed in the grinding ball, and the bottom end of the rotating shaft rod passes through the bottom end of the grinding tank and is connected to the output shaft of a motor fixed below the grinding tank, a material guide bin is sealed and fixed at the upper end of the grinding tank, and a feed pipe is connected to one side of the material guide bin, and the other end of the feed pipe extends out of the side wall of the grinding tank and is connected to a feed hopper, the feed hopper is fixed to the side wall of the grinding tank by connecting columns, and a suction mechanism is arranged in the grinding tank; the invention can realize large-area rapid grinding processing of calcium hydroxide crushed slag by the grinding device, thereby improving the grinding efficiency of the grinding device.

Description

Technical Field

[0001] The invention relates to the technical field of calcium hydroxide processing, in particular to a grinding device for food-grade calcium hydroxide. Background Art

[0002] Food grade calcium hydroxide is an inorganic compound, commonly known as slaked lime or quicklime. It is a white solid that is slightly soluble in water, and its aqueous solution is often called limewater. It is a strong alkali with bactericidal and antiseptic properties, and is corrosive to skin and fabrics; it is widely used in industry. It is a common building material, and is also used as a bactericide and chemical raw material.

[0003] An existing device for grinding calcium hydroxide has an application number of CN202122284130.0, and the patent name is a fine grinding device for modified food-grade calcium hydroxide. The shell assembly includes a shell, a first motor, a separation shaft, an air pump and a nozzle. The first motor is installed on the shell, and the output shaft of the first motor passes through the shell and is rotatably connected to the shell. The output shaft of the first motor is welded to the separation shaft, the air pump is fixedly connected to the bottom of the shell, and the nozzle is installed at the bottom of the shell. The nozzle is connected to the air outlet end of the air pump through a pipe.

[0004] Although the existing grinding device can grind the crushed slag, due to the limited contact area between the grinding disc and the grinding roller inside the shell, the crushed slag located in the center of the grinding disc cannot be better ground with the grinding roller, which leads to the crushed slag inside the grinding disc cannot be effectively and fully ground, which affects the efficiency of the grinding device in grinding the calcium hydroxide crushed slag into powder. Summary of the invention

[0005] The object of the present invention is to provide a food-grade calcium hydroxide grinding device to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: it comprises a grinding tank, wherein a slag grinding mechanism is arranged in the grinding tank, wherein the slag grinding mechanism comprises a grinding bin, a connecting column, a grinding ball, a rotating shaft rod, a material guide bin, a feeding pipe and a feeding hopper, wherein the grinding bin is fixedly arranged in the grinding tank through a plurality of connecting columns, wherein grinding balls are rotatably arranged in the grinding bin, wherein the gap between the outer wall of the grinding ball and the inner wall of the grinding bin decreases from top to bottom, wherein a rotating shaft rod is fixed in the grinding ball, and the bottom end of the rotating shaft rod passes through the bottom end of the grinding tank and is connected to the output shaft of a motor fixed below the grinding tank, wherein a material guide bin is sealed and fixed at the upper end of the grinding tank, and a feeding pipe is connected to one side of the material guide bin, and the other end of the feeding pipe extends out of the side wall of the grinding tank and is connected to the feeding hopper, wherein the feeding hopper is fixed to the side wall of the grinding tank through the connecting column, and wherein a suction mechanism is arranged in the grinding tank, wherein the suction mechanism is used to extract and collect the calcium hydroxide powder that falls downward from the grinding bin into the grinding tank.

[0007] Furthermore, the suction mechanism includes an air inlet pipe, an air suction pipe and an elastic filter net. The air inlet pipe passes through the side wall of the grinding tank and is connected to the material guide bin. One end of the air suction pipe is fixedly connected to the top of the grinding tank, and the other end of the air suction pipe is connected to an air pump arranged on the outside of the grinding tank. An elastic filter net is arranged above the interior of the grinding tank, and the elastic filter net is used for filtering large particle powder adsorbed upward by the air suction pipe.

[0008] Furthermore, a driving rod is rotatably provided at the center of the elastic filter net, and the driving rod passes through the material guide bin and is connected to the rotating shaft rod. A plurality of elastic scrapers are arranged in a circular array on the outer wall of the driving rod, and the plurality of elastic scrapers are rotatably fitted to the lower surface of the elastic filter net.

[0009] Furthermore, the upper end surface of the elastic scraper is provided with a plurality of elastic protrusions, and each elastic protrusion is elastically inserted into the mesh of the elastic filter.

[0010] Furthermore, an arc-shaped material receiving plate is arranged inside the bottom end of the grinding tank, and the arc-shaped material receiving plate is sleeved on the outer wall of the rotating shaft rod.

[0011] Furthermore, the arc-shaped material receiving plate is made of elastic material, the outer wall of the rotating shaft rod is provided with a plurality of L-shaped rods, and the plurality of L-shaped rods are rotatably arranged on the lower end surface of the arc-shaped material receiving plate, the lower surface of the arc-shaped material receiving plate is provided with a plurality of protrusions at equal intervals, and the plurality of protrusions are in elastic extrusion contact with the rotating L-shaped rods.

[0012] Furthermore, the grinding tank comprises a lower tank body and an upper tank body, the upper tank body and the lower tank body are connected at their joints by flanges, and the contacting flanges are fixed to each other by the cooperation of bolts and nuts.

[0013] Furthermore, the fitting surfaces of the symmetrical flanges are both provided with annular grooves, and annular sealing gaskets are sealed in the annular grooves.

[0014] Furthermore, the side wall of the lower tank body is provided with an observation window which is easy to open, and the observation window is located above the arc-shaped receiving plate.

[0015] Furthermore, at least three support rods are welded to the outer wall of the lower tank body, and a support pad is fixed to the lower end surface of each support rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention provides an annular grinding bin in the grinding tank, and grinding balls are rotatably arranged in the grinding bin. The grinding balls and the grinding bin can make large-area contact with the crushed slag falling into the material guide bin, and the gap between the grinding balls and the grinding bin decreases from top to bottom, so that the crushed slag between the grinding balls and the grinding bin can be rotated and ground in a large area, and the ground fine particles of crushed slag directly fall downward into a smaller gap to be ground into powder, and there is no need to adjust the distance between the grinding balls and the grinding bin, so that the grinding device can quickly grind the calcium hydroxide crushed slag over a large area, thereby improving the grinding efficiency of the grinding device.

[0018] 2. The present invention arranges an elastic scraper and an elastic protrusion on the lower surface of the elastic filter, and the shaft rod drives the driving rod and multiple elastic scrapers arranged on the outer wall of the driving rod to rotate, so that the elastic scraper can rotate in contact with the lower surface of the elastic filter, and can quickly scrape and clean the powder adhered to the lower surface of the elastic filter. The elastic scraper drives the elastic protrusion inserted into the mesh to rotate synchronously. When the elastic protrusion is separated from the mesh, the elastic protrusion will pull the mesh of the elastic filter to deform. When the elastic protrusion is rotated and inserted into the mesh, the powder blocked in the mesh of the elastic filter will be cleared, thereby effectively preventing the phenomenon that the suction pipe cannot normally extract and collect the ground powder in the grinding tank due to the clogging of the mesh of the elastic filter by powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a cross-sectional view of the grinding jar of the present invention;

[0021] Figure 3 is a cross-sectional view of a grinding bin of the present invention;

[0022] Figure 4 For the present invention Figure 2 A partial enlarged view of the middle part;

[0023] Figure 5 For the present invention Figure 2 A partial enlarged view of point B in the middle;

[0024] Figure 6 For the present invention Figure 2 A partial enlarged view of point C in the middle.

[0025] In the figure: 1. grinding tank; 101. lower tank body; 102. upper tank body; 103. flange; 2. slag grinding mechanism; 21. grinding bin; 22. connecting column; 23. grinding ball; 24. rotating shaft rod; 25. material guide bin; 26. feeding pipe; 27. feeding hopper; 3. suction mechanism; 31. air inlet pipe; 32. suction pipe; 33. elastic filter; 35. driving rod; 36. elastic scraper; 361. elastic protrusion; 4. arc-shaped receiving plate; 41. protrusion block; 5. L-shaped rod; 6. annular sealing gasket; 7. observation window; 8. support rod; 9. support pad. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Embodiment 1:

[0028] like Figures 1 to 6As shown, the present invention provides a technical solution of a grinding equipment for food-grade calcium hydroxide: it comprises a grinding tank 1, wherein a slag grinding mechanism 2 is arranged in the grinding tank 1, wherein the slag grinding mechanism 2 comprises a grinding bin 21, a connecting column 22, a grinding ball 23, a rotating shaft rod 24, a material guide bin 25, a feeding pipe 26 and a feeding hopper 27, wherein the grinding bin 21 is fixedly arranged in the grinding tank 1 through a plurality of connecting columns 22, wherein the grinding ball 23 is rotatably arranged in the grinding bin 21, wherein the gap between the outer wall of the grinding ball 23 and the inner wall of the grinding bin 21 decreases from top to bottom, wherein a rotating shaft rod 24 is fixed in the grinding ball 23, and the bottom end of the rotating shaft rod 24 passes through the bottom end of the grinding tank 1 and is connected to the output shaft of a motor fixed below the grinding tank 1, wherein a material guide bin 25 is sealed and fixed at the upper end of the grinding bin 21, and a feeding pipe 26 is connected to one side of the material guide bin 25 6. The other end of the feed pipe 26 extends out of the side wall of the grinding tank 1 and is connected to the feed hopper 27. The feed hopper 27 is fixed to the side wall of the grinding tank 1 through a connecting column 22. A suction mechanism 3 is provided in the grinding tank 1. The suction mechanism 3 is used to extract and collect the calcium hydroxide powder that falls downward from the grinding bin 21 into the grinding tank 1. During operation, when it is necessary to grind the food-grade calcium hydroxide slag crushed by the crusher into powder, although the existing grinding device can grind the slag, due to the limited contact area between the grinding disc and the grinding roller inside the shell, it is easy to cause the slag located in the center of the grinding disc to be unable to have better grinding contact with the grinding roller, thereby causing the slag located inside the grinding disc to be unable to be effectively and fully ground, thereby affecting the efficiency of the grinding device in grinding the calcium hydroxide slag into powder;In the design of the present invention, after the conveyor conveys the crushed slag into the feed hopper 27, the feed hopper 27 will convey the crushed slag into the guide bin 25 through the inclined feed pipe 26, and then fall downward into the gap between the grinding balls 23 and the grinding bin 21 through the guide bin 25. Therefore, as the motor below the grinding tank 1 works, the output shaft of the motor will drive the grinding balls 23 to rotate in the grinding bin 21 through the rotating shaft rod 24. Therefore, the rotation of the grinding balls 23 will grind the crushed slag in the gap above the grinding bin 21 into small particles, and then the small particles of crushed slag will fall downward between the grinding bin 21 and the grinding balls 23 into a smaller gap to be ground into powder. At the same time, the powdered calcium hydroxide will fall into the grinding tank 1 through the powder outlet below the grinding bin 21, and then pass through The powder of the suction mechanism 3 is drawn upward out of the powder milling tank 1 for collection. Therefore, the present invention provides a ring-shaped powder milling tank 21 in the powder milling tank 1, and a grinding ball 23 is rotatably provided in the powder milling tank 21. The grinding ball 23 and the powder milling tank 21 can make large-area contact with the slag falling into the guide bin 25, and the gap between the grinding ball 23 and the powder milling tank 21 decreases from top to bottom, so that the slag between the grinding ball 23 and the powder milling tank 21 can be rotated and ground in a large area, and the ground fine particle slag directly falls downward into a smaller gap for grinding into powder, and then there is no need to adjust the distance between the grinding ball 23 and the powder milling tank 21, so that the powder milling device can quickly grind the calcium hydroxide slag in a large area, thereby improving the grinding efficiency of the powder milling device. ;

[0029] As an embodiment of the present invention, the suction mechanism 3 includes an air inlet pipe 31, an air suction pipe 32 and an elastic filter screen 33. The air inlet pipe 31 passes through the side wall of the grinding tank 1 and is connected to the guide bin 25. One end of the air suction pipe 32 is fixedly connected to the top of the grinding tank 1, and the other end of the air suction pipe 32 is connected to the air pump arranged on the outside of the grinding tank 1. An elastic filter screen 33 is arranged on the top of the inside of the grinding tank 1, and the elastic filter screen 33 is used for filtering large particles of powder adsorbed upward by the air suction pipe 32. During operation, when the grinding balls 23 continuously rotate in the grinding bin 21 to grind the calcium hydroxide slag, the air pump arranged on the outside of the grinding tank 1 is turned on at this time, and the suction force generated by the air pump will generate suction force in the grinding tank 1 through the air suction pipe 32, and at the same time, another air pump is used for filtering the large particles of powder adsorbed upward by the air suction pipe 32. The pump will spray gas into the guide bin 25 through the air inlet pipe 31, and the gas entering the guide bin 25 will push the powder ground between the grinding bin 21 and the grinding balls 23 to the lower sides of the grinding tank 1, and the gas sprayed from the powder outlet below the grinding bin 21 will lift the powder dropped from the lower part of the grinding tank 1, and at the same time, part of the gas will be blown downward to the lower part of the grinding tank 1 through the gap inside the grinding bin 21, and the suction force generated by the suction pipe 32 is greater than the gas sprayed from the air inlet pipe 31, so that the suction force generated by the suction pipe 32 can extract and collect the powder lifted from the grinding tank, and at the same time, an elastic filter net 33 is arranged inside the upper part of the grinding tank 1, and the elastic filter net 33 can filter unqualified powder to the lower part of the grinding tank 1, and then collect and grind it again.

[0030] As an embodiment of the present invention, a driving rod 35 is rotatably provided at the center of the elastic filter 33, and the driving rod 35 passes through the guide bin 25 and is connected to the rotating shaft rod 24. A plurality of elastic scrapers 36 are arranged in a circumferential array on the outer wall of the driving rod 35, and the plurality of elastic scrapers 36 are rotatably fitted to the lower surface of the elastic filter 33. During operation, when the rotating shaft rod 24 continuously drives the grinding balls 23 to grind the crushed slag in the grinding bin 21, the rotating shaft rod 24 will drive the driving rod 35 and the plurality of elastic scrapers 36 arranged on the outer wall of the driving rod 35 to rotate, so that the elastic scraper 36 can rotate while fitting to the lower surface of the elastic filter 33. Because the suction force is too large, part of the powder adheres to the elastic filter 33, and then the rotation of the elastic scraper 36 can quickly scrape and clean the powder adhered to the lower surface of the elastic filter 33.

[0031] As an embodiment of the present invention, the upper end surface of the elastic scraper 36 is provided with a plurality of elastic protrusions 361, and each elastic protrusion 361 is elastically inserted into the mesh of the elastic filter 33; during operation, when the driving rod 35 drives the plurality of elastic scrapers 36 to rotate in contact with the lower surface of the elastic filter 33, the elastic scraper 36 will drive the elastic protrusions 361 inserted into the mesh to rotate synchronously, and when the elastic protrusions 361 are separated from the mesh, the elastic protrusions 361 will pull the mesh of the elastic filter 33 to deform, and when the elastic protrusions 361 are rotated and inserted into the mesh, the powder blocked in the mesh of the elastic filter 33 will be cleared, thereby effectively preventing the phenomenon that the suction pipe 32 cannot normally extract and collect the ground powder in the grinding tank 1 due to the blockage of powder in the mesh of the elastic filter 33.

[0032] An arc-shaped receiving plate 4 is arranged inside the bottom end of the powder grinding tank 1, and the arc-shaped receiving plate 4 is sleeved on the outer wall of the rotating shaft rod 24; during operation, when the ground powder inside the powder grinding bin 21 falls downward, the arc-shaped receiving plate 4 is arranged inside the powder grinding tank 1, which can prevent the powder from falling directly into the bottom end of the powder grinding tank 1, thereby making it difficult to lift or collect the powder.

[0033] As an embodiment of the present invention, the arc-shaped material receiving plate 4 is made of elastic material, the rotating shaft rod 24 is provided with a plurality of L-shaped rods 5 on the outer wall, and the plurality of L-shaped rods 5 are rotatably arranged on the lower end surface of the arc-shaped material receiving plate 4, and a plurality of protrusions 41 are evenly spaced on the lower surface of the arc-shaped material receiving plate 4, and the plurality of protrusions 41 are elastically squeezed and contacted with the rotating L-shaped rods 5; when working, when the rotating shaft rod 24 rotates continuously, the rotating shaft rod 24 will drive the plurality of L-shaped rods 5 to rotate on the lower surface of the arc-shaped material receiving plate 4. The arc-shaped receiving plate 4 is movable, and since a plurality of raised blocks 41 are provided on the lower surface of the arc-shaped receiving plate 4, the L-shaped rod 5 will hit the raised blocks 41 when rotating, so that the arc-shaped receiving plate 4 can vibrate, and at the same time, the vertical rod of the L-shaped rod 5 will push the raised blocks 41 upward when continuing to rotate, so that the arc-shaped receiving plate 4 can produce an upwardly protruding surface. Therefore, the vibration and deformation jitter of the arc-shaped receiving plate 4 can be more conducive to the powder that falls on the surface of the arc-shaped receiving plate 4 to be lifted up by the gas.

[0034] As an embodiment of the present invention, the grinding tank 1 includes a lower tank body 101 and an upper tank body 102, and the connection between the upper tank body 102 and the lower tank body 101 is connected by a flange 103, and the contacting flanges 103 are fixed to each other by the cooperation of bolts and nuts; when working, the grinding tank 1 is divided into the lower tank body 101 and the upper tank body 102, and then connected by the flange 103, which is not only convenient for the maintenance of the components arranged inside the grinding tank 1, but also convenient for the maintenance of the inside of the grinding tank 1.

[0035] As an embodiment of the present invention, the fitting surfaces of the symmetrical flanges 103 are each provided with an annular groove, and an annular sealing gasket 6 is sealed in the annular groove; when in operation, an annular sealing gasket 6 is arranged between two adjacent flanges 103, so as to improve the sealing performance at the connection between the lower tank body 101 and the upper tank body 102, thereby preventing the suction pipe 32 from causing pressure relief when sucking powder.

[0036] As an embodiment of the present invention, the side wall of the lower tank body 101 is provided with an observation window 7 which is easy to open, and the observation window 7 is located above the arc-shaped receiving plate 4; during operation, the opening of the observation window 7 is convenient for the processing personnel to observe the amount of powder gathered on the upper surface of the arc-shaped receiving plate 4 at any time. At the same time, when the grinding equipment is not working, the processing personnel can open the observation window 7 to remove the large particles or unqualified powder remaining on the surface of the arc-shaped receiving plate 4 for reprocessing.

[0037] As an embodiment of the present invention, at least three support rods 8 are welded to the outer wall of the lower tank body 101, and a support pad 9 is fixed to the lower end face of each support rod 8; when working, the cooperation between the support rods 8 and the support pad 9 can fix the grinding tank 1 to the area where the grinding equipment is to be installed, so as to facilitate the normal use of the grinding equipment.

[0038] Working principle: During operation, after the conveyor conveys the crushed slag into the feed hopper 27, the feed hopper 27 will convey the crushed slag into the guide bin 25 through the inclined feed pipe 26, and then the crushed slag will fall downward into the gap between the grinding balls 23 and the grinding bin 21 through the guide bin 25. Therefore, as the motor below the grinding tank 1 works, the output shaft of the motor will drive the grinding balls 23 to rotate in the grinding bin 21 through the rotating shaft rod 24. Therefore, the rotation of the grinding balls 23 will grind the crushed slag in the gap above the grinding bin 21 into small particles, and then the small particles of crushed slag will fall downward between the grinding bin 21 and the grinding balls 23 into a smaller gap to be ground into powder. At the same time, the powdered calcium hydroxide will fall into the grinding tank 1 through the powder outlet below the grinding bin 21. When the grinding balls 23 are constantly rotating in the grinding bin 21, the crushed slag will be ground into powder. When the calcium hydroxide residue is ground by internal rotation, the air pump arranged on the outer side of the grinding tank 1 is turned on, and the suction force generated by the air pump will generate suction force in the grinding tank 1 through the suction pipe 32, and at the same time, another air pump will spray gas into the guide bin 25 through the air inlet pipe 31, and the gas entering the guide bin 25 will push the powder ground between the grinding bin 21 and the grinding balls 23 to the lower sides of the grinding tank 1, and at the same time, the gas sprayed from the powder outlet below the grinding bin 21 will lift the powder dropped from the lower part of the grinding tank 1, and at the same time, part of the gas will be blown downward to the lower part of the grinding tank 1 through the gap inside the grinding bin 21, and because the suction force generated by the suction pipe 32 is greater than the gas sprayed from the air inlet pipe 31, the suction force generated by the suction pipe 32 can extract and collect the powder raised from the grinding tank.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grinding device for food-grade calcium hydroxide, comprising a grinding tank (1), characterized in that: The grinding pot (1) is provided with a slag crushing grinding mechanism (2), the slag crushing grinding mechanism (2) comprising a grinding bin (21), a connecting column (22), a grinding ball (23), a rotating shaft (24), a material guide bin (25), a feeding pipe (26) and a feeding hopper (27), the grinding bin (21) being fixedly arranged in the grinding pot (1) via a plurality of connecting columns (22), a grinding ball (23) being rotatably arranged in the grinding bin (21), the gap between the outer wall of the grinding ball (23) and the inner wall of the grinding bin (21) being gradually reduced from top to bottom, a rotating shaft (24) being fixed in the grinding ball (23), and the rotating shaft (24) ) passes through the bottom end of the grinding tank (1) and is connected to the output shaft of the motor fixed below the grinding tank (1); a guide bin (25) is sealed and fixed at the upper end of the grinding tank (21); one side of the guide bin (25) is connected to a feed pipe (26); the other end of the feed pipe (26) extends out of the side wall of the grinding tank (1) and is connected to a feed hopper (27); the feed hopper (27) is fixed to the side wall of the grinding tank (1) through a connecting column (22); a suction mechanism (3) is provided in the grinding tank (1); the suction mechanism (3) is used to extract and collect the calcium hydroxide powder that falls downward from the grinding tank (21) into the grinding tank (1); The suction mechanism (3) comprises an air inlet pipe (31), an air suction pipe (32) and an elastic filter net (33); the air inlet pipe (31) passes through the side wall of the grinding tank (1) and is connected to the material guide bin (25); one end of the air suction pipe (32) is fixedly connected to the top of the grinding tank (1), and the other end of the air suction pipe (32) is connected to an air pump arranged outside the grinding tank (1); an elastic filter net (33) is arranged above the inside of the grinding tank (1), and the elastic filter net (33) is used for filtering large particles of powder adsorbed upward by the air suction pipe (32); A driving rod (35) is rotatably provided at the center of the elastic filter net (33), and the driving rod (35) passes through the material guide bin (25) and is connected to the rotating shaft rod (24), and a plurality of elastic scrapers (36) are arranged in a circular array on the outer wall of the driving rod (35), and the plurality of elastic scrapers (36) are rotatably attached to the lower surface of the elastic filter net (33); The upper end surface of the elastic scraper (36) is provided with a plurality of elastic protrusions (361), and each elastic protrusion (361) is elastically inserted into a mesh of the elastic filter net (33); An arc-shaped receiving plate (4) is arranged inside the bottom end of the grinding pot (1), and the arc-shaped receiving plate (4) is sleeved on the outer wall of the rotating shaft rod (24); The arc-shaped material receiving plate (4) is made of elastic material, a plurality of L-shaped rods (5) are arranged on the outer wall of the rotating shaft rod (24), and the plurality of L-shaped rods (5) are rotatably arranged on the lower end surface of the arc-shaped material receiving plate (4), a plurality of protrusions (41) are arranged at equal intervals on the lower surface of the arc-shaped material receiving plate (4), and the plurality of protrusions (41) are in elastic extrusion contact with the rotating L-shaped rods (5); The grinding tank (1) comprises a lower tank body (101) and an upper tank body (102), wherein the upper tank body (102) and the lower tank body (101) are connected at their joints by means of flanges (103), and the contacting flanges (103) are fixed to each other by means of bolts and nuts. The fitting surfaces of the symmetrical flanges (103) are both provided with annular grooves, and annular sealing gaskets (6) are sealed in the annular grooves; The side wall of the lower tank body (101) is provided with an observation window (7) which is easy to open, and the observation window (7) is located above the arc-shaped receiving plate (4); At least three support rods (8) are welded to the outer wall of the lower tank body (101), and a support pad (9) is fixed to the lower end surface of each support rod (8).

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