CN220803463U

CN220803463U - Low-noise grinding and fine grinding equipment

Info

Publication number: CN220803463U
Application number: CN202322497704.1U
Authority: CN
Inventors: 马西良; 贺春皓; 谢永定; 郑逸飞
Original assignee: Shandong University of Science and Technology
Current assignee: Shandong University of Science and Technology
Priority date: 2023-09-14
Filing date: 2023-09-14
Publication date: 2024-04-19
Anticipated expiration: 2033-09-14

Abstract

The application provides low-noise grinding fine grinding equipment which comprises a grinding box, wherein a bottom tank is connected to the outer wall of the top of the grinding box in a penetrating way, a supporting frame is fixed to the outer walls of four corners of the bottom of the grinding box, a discharge port is connected to the outer wall of the bottom of one side of the bottom tank in a penetrating way, a feeding funnel is arranged on the outer wall of the top of the grinding box in a penetrating way, an active grinding roller is arranged on the inner wall of one side of the top of the grinding box, two ends of the active grinding roller are fixedly provided with transmission shafts, two ends of each transmission shaft are adjacent to the inner walls of two sides of the grinding box in a rotating way, and a driving motor is arranged on the outer wall of one side of the grinding box. According to the application, through the arrangement of the linkage noise reduction assembly, in the working process of the grinding and fine grinding equipment, the air pump is driven to work, generated compressed air is input into the telescopic air bag through the air pipe, the compressed air is injected into the noise reduction air bag through the through pipe, and the noise reduction air bag is covered on the outer walls of the grinding box and the bottom tank, so that the grinding and fine grinding equipment works to realize the effects of sound insulation and noise reduction.

Description

Low-noise grinding and fine grinding equipment

Technical Field

The utility model relates to the technical field of grinding and fine grinding equipment, in particular to low-noise grinding and fine grinding equipment.

Background

Crushing, grinding and refining is a processing method for changing materials into smaller particles or powder; it is widely applied to a plurality of industries including the fields of chemical industry, pharmacy, food processing, material research and the like; the methods of grinding and lapping are varied and include, generally: mechanical crushing: crushing the material into a desired particle size by performing impact, shearing or crushing operations of the material using a crusher, grinder or the like; ball milling: placing the materials into a ball milling tank, and rotationally rubbing together with a ball grinding material to grind the materials into particles or powder; cutting and grinding: cutting the material into desired particle sizes using a cutting tool or blade; liquid grinding: the materials are suspended in a liquid medium and are ground in a stirring or high-speed impact mode, and the method is suitable for some materials which are difficult to crush.

However, the grinding and accurate grinding equipment in the existing market is simple in structure, noise can be generated in the working process of the grinding and accurate grinding equipment, the noise-insulation and noise-reduction capability is not achieved, and the fineness uniformity cannot be guaranteed by the traditional grinding and accurate grinding equipment. We have therefore improved on this by proposing a low noise grinding and refining apparatus.

Disclosure of Invention

The utility model aims at: the grinding and fine grinding device aims at the problems that noise can be generated in the working process of the existing grinding and fine grinding device, the noise-insulation and noise-reduction capability is not achieved, and the fineness uniformity cannot be guaranteed by the traditional grinding and fine grinding device.

In order to achieve the above object, the present utility model provides the following technical solutions:

a low noise grinding and refining apparatus to improve the above problems.

The application is specifically as follows:

Including grinding the case, it has the end jar to link up on the top outer wall of grinding the case, be fixed with the support frame on the bottom four corners outer wall of grinding the case, link up on end jar one side bottom outer wall and be connected with the bin outlet, link up on the top outer wall of grinding the case and install feed hopper, install initiative grinding roller on the top one side inner wall of grinding the case, the both ends of initiative grinding roller are fixed with the transmission shaft, and the transmission shaft both ends rotate with the both sides inner wall of grinding the case and close to, install driving motor on one side outer wall of grinding the case, driving motor output shaft and transmission shaft connection, the movable tank has been seted up on the both ends outer wall of grinding case in initiative grinding roller one side, the internally mounted of movable block has been installed to the movable tank, rotate on the outer wall between the movable block and install driven grinding roller, be fixed with flexible gasbag on the inner wall of movable block one side, be provided with the linkage subassembly on the outer wall of grinding case and end jar, be provided with the accurate grinding screening subassembly on the middle part inner wall of grinding the case of making an uproar.

As the preferable technical scheme of the application, the linkage noise reduction assembly comprises a noise reduction air bag which is connected to the outer walls of the grinding box and the bottom tank in a fitting way, a through pipe is communicated with the outer walls of two sides of the noise reduction air bag, one end of the through pipe is communicated with the inside of one side of the telescopic air bag, an air pump is installed on the outer wall of one side of the grinding box, the transmission shaft is coaxial with a driving shaft of the air pump, an air conveying end of the air pump is communicated with an air conveying pipe, one end of the air conveying pipe is communicated with the inside of the telescopic air bag, an adjustable pressure relief valve is communicated with the outer wall of one side top of the noise reduction air bag, one end of the adjustable pressure relief valve is communicated with an exhaust elbow, and the end of the exhaust elbow is positioned above the driving motor.

As the preferable technical scheme of the application, the linkage screening fine grinding assembly comprises a screen plate arranged in the middle of the grinding box, sliding blocks are fixed on the outer walls of two sides of the screen plate, sliding grooves are formed in the inner walls of the middle of two sides of the grinding box, the sliding blocks are inserted into the sliding grooves, springs are fixed on the outer walls of the bottom ends of the sliding grooves, mounting shafts are rotatably connected to the inner walls of two sides of the middle of the grinding box, cams are fixedly distributed on the outer walls of the mounting shafts and are in contact connection with the screen plate, a first belt pulley is fixed at one end of the mounting shaft penetrating through the outer part of the grinding box, a second belt pulley is fixed at one end of the transmission shaft, and a belt is sleeved between the first belt pulley and the second belt pulley.

According to the preferable technical scheme, the suction pump is fixed on the outer wall of one side of the grinding box, the transmission shaft is coaxial with the driving shaft of the suction pump, the suction end of the suction pump is connected with the suction pipe in a penetrating way, the end part of the suction pipe penetrates through the grinding box, the end part of the suction pipe is positioned above the screen plate, the pump end of the suction pump is connected with the pump pipe in a penetrating way, the end part of the pump pipe penetrates through the grinding box, and the pump pipe is positioned above the grinding roller.

As a preferable technical scheme of the application, guide blocks are fixed on the outer walls of the two sides of the moving block, and guide grooves are formed on the inner walls of the two sides of the moving groove.

As a preferable technical scheme of the application, the rubber cushion is attached and connected to the inner part of the bottom tank.

As a preferable technical scheme of the application, the air suction end of the air pump is provided with an air filter element in a penetrating way.

Compared with the prior art, the utility model has the beneficial effects that:

In the scheme of the application:

1. Through the arrangement of the linkage noise reduction assembly, the transmission shaft rotates to drive the air pump to work in the working process of the grinding and fine grinding equipment, generated compressed air is input into the telescopic air bag through the air pipe, the compressed air is injected into the noise reduction air bag through the through pipe, the telescopic air bag is inflated to expand to drive the movable block to move in the movable groove, the driven grinding roller is tightly attached to the outer wall of the driving grinding roller, the pressure relief valve can be adjusted to adjust the pressure threshold value in the telescopic air bag, so that the force of the driven grinding roller attached to the driving grinding roller is adjusted, the grinding processing of different fineness is facilitated, and the noise reduction air bag is covered on the outer walls of the grinding box and the bottom tank, so that the noise reduction effect of the grinding and fine grinding equipment in working and noise insulation is achieved;

2. Through linkage screening correct grinding subassembly setting, the powder after above-mentioned grinding roller mills falls on the sieve, carries out the screening of qualified fineness powder through the sieve, and above-mentioned transmission shaft rotates the worker and can drive the second belt pulley and rotate, can drive the installation axle and rotate under the cooperation transmission of first belt pulley and belt, and the installation axle can drive the cam and rotate, and the sieve of cam below is knocked, can drive the sieve and reciprocate vibrations under the cooperation of spout, slider and spring, has improved the screening efficiency of sieve, does benefit to the screening of grinding powder.

Drawings

Fig. 1 is a schematic perspective view of a low-noise grinding and refining apparatus according to the present application;

FIG. 2 is a schematic view showing a three-dimensional cutaway structure of a low-noise grinding and refining apparatus according to the present application;

FIG. 3 is an enlarged view showing the structure of the region A of the low-noise grinding and refining apparatus according to the present application;

FIG. 4 is an enlarged view showing the structure of region B in the low-noise grinding and refining apparatus according to the present application;

FIG. 5 is an enlarged view of the structure of region C in the low noise grinding and refining apparatus of the present application;

FIG. 6 is an enlarged view of the structure of the region D of the low noise grinding and refining apparatus according to the present application;

fig. 7 is an enlarged view of the structure of the E region in the low noise grinding and refining apparatus according to the present application.

The figures indicate:

1. A grinding box; 2. a bottom tank; 3. a support frame; 4. a discharge port; 5. a feed hopper; 6. an active grinding roller; 61. a transmission shaft; 7. a driving motor; 8. a moving groove; 9. a moving block; 10. driven grinding roller; 11. a telescopic air bag; 12. a linkage noise reduction assembly; 13. a linkage screening fine grinding assembly; 14. a suction pump; 15. a suction pipe; 16. a pump material pipe; 17. a guide block; 18. a guide groove; 19. an air filter element;

121. a noise reduction air bag; 122. a through pipe; 123. an air pump; 124. a gas pipe; 125. an adjustable relief valve; 126. an exhaust elbow;

131. A sieve plate; 132. a slide block; 133. a chute; 134. a spring; 135. a mounting shaft; 136. a cam; 136. a cam; 137. a first pulley; 138. a second pulley; 139. a belt.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model.

Thus, the following detailed description of the embodiments of the utility model is not intended to limit the scope of the utility model, as claimed, but is merely representative of some embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, under the condition of no conflict, the embodiments of the present utility model and the features and technical solutions in the embodiments may be combined with each other.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, the terms "upper", "lower", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or an azimuth or a positional relationship conventionally put in use of the inventive product, or an azimuth or a positional relationship conventionally understood by those skilled in the art, such terms are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element to be referred must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Referring to fig. 1, 2, 3, 4, 5, 6 and 7, the present embodiment proposes a low noise grinding and fine grinding apparatus, which comprises a grinding box 1, a bottom tank 2 is connected to the top outer wall of the grinding box 1, a supporting frame 3 is fixed to the four corner outer walls of the bottom of the grinding box 1, a discharge port 4 is connected to the bottom outer wall of one side of the bottom tank 2, a feed hopper 5 is mounted to the top outer wall of the grinding box 1, an active grinding roller 6 is mounted to the top inner wall of one side of the grinding box 1, transmission shafts 61 are fixed at two ends of the active grinding roller 6, two ends of the transmission shafts 61 are adjacent to the two inner walls of the grinding box 1 in rotation, a driving motor 7 is mounted to one side outer wall of the grinding box 1, an output shaft of the driving motor 7 is connected to the transmission shafts 61, and a moving groove 8 is formed in the outer walls of the two ends of the grinding box 1 on one side of the active grinding roller 6, the internally mounted of movable groove 8 has movable block 9, rotate on the outer wall between the movable block 9 and install driven grinding roller 10, movable groove 8 is fixed with flexible gasbag 11 on the inner wall of movable block 9 one side, be provided with linkage on the outer wall of grinding case 1 and end jar 2 and fall subassembly 12 of making an uproar, be provided with linkage screening fine grinding subassembly 13 on the middle part inner wall of grinding case 1, this grinding fine grinding equipment's use, the raw materials is thrown into grinding case 1 through feed hopper 5 in-process driving motor 7 work drive transmission shaft 61 and initiative grinding roller 6 rotate, can drive movable block 9 and remove in movable groove 8 under the lapse effect of flexible gasbag 11, make driven grinding roller 10 closely laminate on initiative grinding roller 6 outer wall, carry out the grinding of throw-in material under the cooperation of driven grinding roller 10 and initiative grinding roller 6.

As a preferred embodiment, based on the above mode, the linkage noise reduction assembly 12 further comprises a noise reduction air bag 121 which is connected on the outer walls of the grinding box 1 and the bottom tank 2 in a fitting way, the outer walls of the two sides of the noise reduction air bag 121 are communicated with a through pipe 122, one end of the through pipe 122 is communicated with the inside of one side telescopic air bag 11, an air pump 123 is installed on the outer wall of one side of the grinding box 1, a transmission shaft 61 and a driving shaft of the air pump 123 are coaxial, an air conveying end of the air pump 123 is communicated with an air conveying pipe 124, one end of the air conveying pipe 124 is communicated with the inside of the telescopic air bag 11, an adjustable pressure release valve 125 is communicated with the outer wall of the top of one side of the noise reduction air bag 121, one end of the adjustable pressure release valve 125 is communicated with an exhaust elbow 126, and the end of the exhaust elbow 126 is positioned above the driving motor 7, in the working process of the grinding and fine grinding equipment, the transmission shaft 61 rotates to drive the air pump 123 to rotate, generated compressed air is input into the telescopic air bag 11 through the air pipe 124, compressed air is injected into the noise reduction air bag 121 through the through pipe 122, the telescopic air bag 11 is inflated to expand to drive the movable block 9 to move in the movable groove 8, the driven grinding roller 10 is tightly attached to the outer wall of the driving grinding roller 6, the pressure relief valve 125 can be adjusted, the pressure threshold value in the telescopic air bag 11 and the noise reduction air bag 121 can be adjusted, the force of the driven grinding roller 10 attached to the driving grinding roller 6 is adjusted, the grinding processing of different fineness is facilitated, and the noise reduction air bag 121 covers the outer wall of the bottom tank 2 of the grinding box 1 and plays the role of sound insulation and noise reduction of the grinding and fine grinding equipment.

As a preferred embodiment, further, linkage screening fine grinding subassembly 13 is including setting up at the sieve 131 at grinding case 1 middle part on the basis of the above-mentioned mode, be fixed with slider 132 on the both sides outer wall of sieve 131, the spout 133 has been seted up on the both sides middle part inner wall of grinding case 1, slider 132 is pegged graft in the inside of spout 133, and be fixed with spring 134 on the bottom outer wall of spout 133, be connected with installation axle 135 on the middle part both sides inner wall of grinding case 1 in the rotation, be fixed with cam 136 on the outer wall of installation axle 135, and cam 136 and sieve 131 contact connection, installation axle 135 runs through the one end that is fixed with first belt pulley 137 in grinding case 1 outside, the one end of transmission shaft 61 is fixed with second belt pulley 138, the cover is equipped with the belt 139 between first belt pulley 137 and the second belt pulley 138, the powder after the grinding of above-mentioned grinding roller falls on sieve 131, pass through sieve 131 and pass through qualified fineness powder, in the bottom jar 2 is collected to qualified powder, the later stage is discharged through bin 4, above-mentioned transmission shaft 61 rotation work can drive second belt pulley 138, install axle 136 can drive under the cooperation of first belt pulley 137 and belt 135 and can drive the installation axle 136 and can take place the rotation, the cam 136 can take place, the vibration of the sieve 131 can take place, the vibration of the sieve plate 131 can take place, and make a sieve 133 is carried out, the vibration, and the vibration can take place, the sieve is carried out, and the sieve is carried out by the vibration, and can take advantage under the vibration, the sieve plate 131.

As a preferred embodiment, further, on the basis of the above mode, a suction pump 14 is fixed on the outer wall of one side of the grinding tank 1, the transmission shaft 61 and the driving shaft of the suction pump 14 are coaxial, the suction end of the suction pump 14 is connected with a suction pipe 15 in a penetrating manner, the end of the suction pipe 15 penetrates through the inside of the grinding tank 1, the end of the suction pipe 15 is located above the screen plate 131, the pump end of the suction pump 14 is connected with a pump pipe 16 in a penetrating manner, the end of the pump pipe 16 penetrates through the inside of the grinding tank 1, the pump pipe 16 is located above the grinding roller, the suction pump 14 is driven to operate during the rotation of the transmission shaft 61, the large-particle powder above the screen plate 131 is sucked through the suction pipe 15, the sucked powder flows back to the above the grinding roller, and the circulating grinding of the powder is performed through the grinding roller, so that the grinding efficiency and the effect of the fine grinding device are improved.

As a preferred embodiment, on the basis of the above mode, further, guide blocks 17 are fixed on the outer walls of the two sides of the moving block 9, guide grooves 18 are formed on the inner walls of the two sides of the moving groove 8, and the cooperation of the guide blocks 17 and the guide grooves 18 realizes that the moving block 9 moves in the moving groove 8 more stably.

In the preferred embodiment, the rubber cushion is attached to the inside of the bottom can 2, and the rubber cushion improves the blanking sound insulation and noise reduction capability in the bottom can 2.

In a preferred embodiment, the air filter 19 is installed to penetrate the air intake end of the air pump 123, and the air intake of the air pump 123 is filtered by the air filter 19.

Specifically, this low noise's grinding correct grinding equipment during operation/during use: in the use process of the grinding and fine grinding equipment, raw materials are put into a grinding box 1 through a feeding funnel 5, a driving motor 7 works to drive a transmission shaft 61 and a driving grinding roller 6 to rotate, a moving block 9 is driven to move in a moving groove 8 under the pushing action of a telescopic air bag 11, a driven grinding roller 10 is tightly attached to the outer wall of the driving grinding roller 6, the materials are put into the grinding box under the matching of the driven grinding roller 10 and the driving grinding roller 6, in the working process of the grinding and fine grinding equipment, the transmission shaft 61 rotates to drive an air pump 123 to rotate, generated compressed air is input into the telescopic air bag 11 through an air pipe 124, the compressed air is injected into a noise reduction air bag 121 through a through pipe 122, the telescopic air bag 11 is inflated to drive the moving block 9 to move in the moving groove 8, the driven grinding roller 10 is tightly attached to the outer wall of the driving grinding roller 6, the adjustable pressure relief valve 125 can be adjusted to adjust the pressure threshold value in the telescopic air bag 11 and the noise reduction air bag 121, thereby realizing the adjustment of the force of the driven grinding roller 10 attached to the driving grinding roller 6, being beneficial to grinding processing with different fineness, the noise reduction air bag 121 covers the outer walls of the grinding box 1 and the bottom tank 2 to play the role of sound insulation and noise reduction of the grinding fine grinding equipment, the ground powder of the grinding roller falls on the sieve plate 131, the sieve plate 131 screens the qualified powder, the qualified powder is collected into the bottom tank 2, the later is discharged through the discharge outlet 4, the rotation of the transmission shaft 61 drives the second belt pulley 138 to rotate, the installation shaft 135 is driven to rotate under the cooperation transmission of the first belt pulley 137 and the belt 139, the installation shaft 135 drives the cam 136 to rotate, the sieve plate 131 below the cam 136 knocks, the sieve plate 131 can be driven to vibrate reciprocally under the cooperation of the sliding block 132 and the spring 134 in the sliding groove 133, so that the sieving efficiency of the sieve plate 131 is improved, the sieving of the grinding powder is facilitated, the suction pump 14 can be driven to work in the rotation process of the transmission shaft 61, the larger powder of the particles above the sieve plate 131 is sucked through the suction pipe 15, the sucked powder flows back to the upper part of the grinding roller, the powder is circularly ground through the grinding roller, and the grinding efficiency and effect of the grinding fine grinding equipment are improved.

The above embodiments are only for illustrating the present utility model and not for limiting the technical solutions described in the present utility model, and although the present utility model has been described in detail in the present specification with reference to the above embodiments, the present utility model is not limited to the above specific embodiments, and thus any modifications or equivalent substitutions are made to the present utility model; all technical solutions and modifications thereof that do not depart from the spirit and scope of the utility model are intended to be included in the scope of the appended claims.

Claims

1. The utility model provides a grinding fine grinding equipment of low noise, its characterized in that, including grinding case (1), link up on the top outer wall of grinding case (1) and be connected with end tank (2), be fixed with support frame (3) on the bottom four corners outer wall of grinding case (1), link up on the bottom outer wall of end tank (2) one side and be connected with bin outlet (4), link up on the top outer wall of grinding case (1) and install feed hopper (5), install initiative grinding roller (6) on the top one side inner wall of grinding case (1), the both ends of initiative grinding roller (6) are fixed with transmission shaft (61), and the both sides inner wall rotation of transmission shaft (61) both ends and grinding case (1) is close to, install driving motor (7) on the outer wall of one side of grinding case (1), driving motor (7) output shaft and transmission shaft (61) are connected, set up on the outer wall of both ends of grinding case (1) one side and be located initiative grinding roller (6) and move groove (8), internally mounted in movable block (9), be located flexible and move on one side of the fixed air bag (10) between movable block (9), the grinding box (1) and the outer wall of the bottom tank (2) are provided with a linkage noise reduction assembly (12), and the inner wall of the middle part of the grinding box (1) is provided with a linkage screening accurate grinding assembly (13).

2. The low-noise grinding fine grinding equipment according to claim 1, wherein the linkage noise reduction assembly (12) comprises a noise reduction air bag (121) which is connected to the outer walls of the grinding box (1) and the bottom tank (2) in a fitting manner, a through pipe (122) is communicated to the outer walls of two sides of the noise reduction air bag (121), one end of the through pipe (122) is communicated to the inside of one side of the telescopic air bag (11), an air pump (123) is mounted on one side of the outer wall of the grinding box (1), a driving shaft of the driving shaft (61) and a driving shaft of the air pump (123) are coaxial, an air conveying end of the air pump (123) is in through connection with an air conveying pipe (124), one end of the air conveying pipe (124) is in communication with the inside of the telescopic air bag (11), one side top outer wall of the noise reduction air bag (121) is in through connection with an adjustable pressure relief valve (125), one end of the adjustable pressure relief valve (125) is in through connection with an exhaust elbow (126), and the end of the exhaust elbow (126) is located above the driving motor (7).

3. The low-noise grinding fine grinding equipment according to claim 1, wherein the linkage screening fine grinding assembly (13) comprises a screen plate (131) arranged in the middle of the grinding box (1), sliding blocks (132) are fixed on the outer walls of two sides of the screen plate (131), sliding grooves (133) are formed in the inner walls of the middle of two sides of the grinding box (1), the sliding blocks (132) are inserted into the sliding grooves (133), springs (134) are fixed on the outer walls of the bottom ends of the sliding grooves (133), mounting shafts (135) are rotatably connected to the inner walls of two sides of the middle of the grinding box (1), cams (136) are fixedly distributed on the outer walls of the mounting shafts (135), the cams (136) are in contact connection with the screen plate (131), the mounting shafts (135) penetrate through one ends of the outer portions of the grinding box (1) to be fixedly provided with first belt pulleys (137), one ends of the transmission shafts (61) are fixedly provided with second belt pulleys (138), and belts (139) are sleeved between the first belt pulleys (137) and the second belt pulleys (138).

4. A low noise grinding and refining equipment according to claim 3, characterized in that, a suction pump (14) is fixed on the outer wall of one side of the grinding box (1), the transmission shaft (61) is coaxial with the driving shaft of the suction pump (14), the suction end of the suction pump (14) is connected with a suction pipe (15) in a penetrating way, the end of the suction pipe (15) penetrates through the inside of the grinding box (1), the end of the suction pipe (15) is located above the screen plate (131), the pumping end of the suction pump (14) is connected with a pumping pipe (16) in a penetrating way, the end of the pumping pipe (16) penetrates through the inside of the grinding box (1), and the pumping pipe (16) is located above the grinding roller.

5. A low noise grinding and refining apparatus according to claim 2, characterized in that guide blocks (17) are fixed to both side outer walls of the moving block (9), and guide grooves (18) are formed in both side inner walls of the moving groove (8).

6. A low noise grinding and refining apparatus as claimed in claim 1, characterized in that a rubber cushion is attached to the inside of the bottom tank (2).

7. A low-noise grinding and refining apparatus as claimed in claim 2, characterized in that the suction end of the air pump (123) is provided with an air filter element (19) mounted therethrough.