A solid material grinding method and device with adjustable discharge particle size

Abstract

The present invention discloses a solid material grinding method and device with adjustable discharge particle size, wherein the device includes a grinding disc housing; a dynamic grinding disc and a static grinding disc are placed in a grinding disc cavity in the grinding disc housing in a coaxial structure with grinding surfaces facing each other; the dynamic grinding disc is driven by a driving mechanism to rotate in the grinding disc housing to grind the material between the dynamic and static grinding discs; the dynamic grinding disc is also connected to a push mechanism, and the push mechanism adjusts the spacing between the dynamic and static grinding discs by pushing and pulling; the top rectifying air blowing and the side rectifying air blowing blow air from the top and sides of the dynamic and static grinding discs respectively, and the center rectifying air blowing blows air toward the center of the static grinding disc. The present invention is suitable for the crushing process of solid minerals, and utilizes the clearance between the dynamic and static grinding discs to avoid metal collision during the grinding process, thereby improving energy utilization efficiency; reducing the temperature rise during the grinding process to ensure the stability of the properties of the mineral particles; and ensuring the accuracy of the product particle size by accurately controlling the grinding clearance.

Description

Technical Field

[0001] The invention relates to a grinding device, in particular to a solid material grinding method and a device with adjustable discharge particle size. Background Art

[0002] In order to test the physical and chemical properties of solid minerals, it is often necessary to crush a certain mass of representative samples to a finer particle size through technical means to facilitate subsequent analysis and inspection. Gyratory crushers, cone crushers, jaw crushers, and collision crushers (including rod mills, ball mills, etc.) are widely used in the crushing process of solid minerals at home and abroad. Commonly used crushing equipment has metal collisions during use, which causes the equipment to heat up, vibrate, and increase noise, resulting in a waste of input energy; the higher temperature of the equipment after long-term powder making will have a certain impact on the physical and chemical properties of the mineral particles, affecting the accuracy of the test results. The particle size control of the products of conventional powder making equipment is not precise, and the particles are often too coarse to meet the requirements of subsequent use. Summary of the invention

[0003] The purpose of the present invention is to provide a solid material grinding method and device with adjustable output particle size, which is suitable for the crushing process of solid minerals, utilizes the gap between the dynamic and static grinding discs to avoid metal collision during the grinding process, thereby improving energy utilization efficiency; reduces the temperature rise during the grinding process to ensure the stability of the properties of the mineral particles; and ensures the accuracy of the product particle size by accurately controlling the grinding gap.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A solid material grinding device with adjustable discharge particle size, comprising:

[0006] The grinding disc housing is provided with an inlet, an outlet, a top rectifying air blow, a side rectifying air blow, and a center rectifying air blow;

[0007] The dynamic and static grinding discs are coaxially arranged in the grinding disc cavity in the grinding disc housing with their grinding surfaces facing each other; the static grinding disc is fixed to the grinding disc housing, and the dynamic grinding disc is driven by a driving mechanism to rotate in the grinding disc housing to grind the material between the dynamic and static grinding discs; the dynamic grinding disc is also connected to a pushing mechanism, and the pushing mechanism adjusts the distance between the dynamic and static grinding discs by pushing and pulling;

[0008] The top rectifying air blowing and the side rectifying air blowing blow air from above and from the sides of the dynamic and static grinding discs respectively along the radial direction of the dynamic and static grinding discs, and the center rectifying air blowing blows air toward the center of the static grinding disc along the axial direction of the dynamic and static grinding discs.

[0009] Preferably, the dynamic and static grinding discs have the same shape and structure, and both of them are based on the grinding disc, with the center of the grinding surface of the grinding disc as the point, and adjacent convex surfaces and concave surfaces are distributed in a fan shape on the grinding surface; the outer edge surrounding the convex surface and concave surface on the grinding surface of the grinding disc is the grinding side; a grinding cavity is formed between the dynamic grinding disc and the static grinding disc, the concave surface is connected to the grinding cavity, and the convex surface side connects the concave surface and the convex surface.

[0010] Preferably, adjacent convex surfaces and concave surfaces form a group, and 2-6 groups of the concave and convex surfaces are arranged on the grinding surface of each grinding disc.

[0011] Preferably, the convex side edge is inclined at a certain angle, and the inclined convex side edge has a certain width.

[0012] Preferably, the driving mechanism comprises:

[0013] shell;

[0014] A central shaft, which is placed in the central shaft cavity of the housing and one end of which is coaxially connected to the dynamic grinding disc;

[0015] A plurality of fixed bearings, which are sleeved on the central shaft and evenly distributed along the axial direction of the central shaft;

[0016] A sprocket, which is sleeved on the other end of the central shaft and is placed outside the housing;

[0017] A transmission motor is connected to the sprocket through a chain.

[0018] Preferably, the end of the central shaft, the central shaft mounting seat, the dynamic grinding disc mounting seat and the dynamic grinding disc are coaxially connected in sequence.

[0019] Preferably, the pushing mechanism comprises:

[0020] A main cylinder, the axial direction of which is parallel to the axial direction of the central axis;

[0021] A bearing sleeve connected to one of the fixed bearings;

[0022] A connecting plate is respectively connected to the bearing sleeve and the end of the piston rod in the master cylinder.

[0023] Preferably, at least one limiting bolt passes through the outer shell and abuts against the connecting plate, and the axial direction of the limiting bolt is parallel to the axial direction of the central axis.

[0024] Preferably, the feed inlet extends toward the center of the static grinding disc, and a feed hopper is mounted on the feed inlet; and a collecting hopper is mounted on the discharge port.

[0025] Preferably, a top cover is provided on the opening of the feed hopper, the opening and closing of which is controlled by a cover-opening cylinder, the top cover is provided with a cylinder top cover rectifying air blowing for blowing air into the feed hopper, and a cylinder side wall rectifying air blowing for blowing air into the feed hopper is provided on the side of the feed hopper near the top cover.

[0026] Preferably, a vibrating screen whose vibration is controlled by a vibrating motor is installed at the outlet of the collecting hopper.

[0027] Preferably, the collecting hopper is connected to the feeding port via a material back-blowing pipe, and the collecting hopper is also provided with a back-blowing air blower that can be connected to the blowing device.

[0028] The solid material grinding device with adjustable discharge particle size described in any one of the above items, and the grinding method thereof is as follows:

[0029] The material is fed into the grinding disc housing, and is semi-fluidized through the interaction of center rectifying air blowing, top rectifying air blowing, and side rectifying air blowing. The semi-fluidized material particles are then broken up by the relative movement of the dynamic grinding disc and the static grinding disc.

[0030] The solid material grinding method and device with adjustable output particle size provided by the present invention are suitable for the crushing process of solid minerals. The gap between the dynamic and static grinding discs is used to avoid metal collision during the grinding process, thereby improving energy utilization efficiency; reducing the temperature rise during the grinding process to ensure the stability of the properties of the mineral particles; and ensuring the accuracy of the product particle size by accurately controlling the grinding gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0032] Figure 1 A cross-sectional view of a solid material grinding device with adjustable discharge particle size provided in Embodiment 1 of the present invention;

[0033] Figure 2 A three-dimensional diagram of a solid material grinding device with adjustable discharge particle size provided in Embodiment 1 of the present invention;

[0034] Figure 3 A cross-sectional view of a solid material grinding device with adjustable discharge particle size provided in the second embodiment of the present invention;

[0035] Figure 4 A three-dimensional diagram of a solid material grinding device with adjustable discharge particle size provided in the second embodiment of the present invention;

[0036] Figure 5 This is a structural diagram of the dynamic and static grinding discs in the solid material grinding device with adjustable discharge particle size provided in embodiments 1 and 2 of the present invention.

[0037] Description of reference numerals:

[0038] 1. Feeding port; 2. Center rectifying air blowing; 3. Static grinding disc; 4. Grinding disc housing; 5. Dynamic grinding disc; 6. Dynamic grinding disc mounting seat; 7. Main cylinder; 8. Limit bolt; 9. Sprocket; 10. Connecting plate; 11. Center shaft cavity; 12. Center shaft; 13. Fixed bearing; 14. Limiting groove; 15. Center shaft mounting seat; 16. Grinding disc cavity; 17. Top rectifying air blowing; 18. Bearing sleeve; 19. Housing; 20. Vibrating screen; 21. Vibrating motor; 22. Material backflush pipe;

[0039] 101, transmission motor; 102, support seat; 103, base; 104, side rectification air blowing; 105, collecting hopper; 106, cylinder side wall rectification air blowing; 107, feeding hopper; 108, cylinder top cover rectification air blowing; 109, open cover cylinder; 110, vent hole; 111, top cover; 112, back-blowing air blowing;

[0040] 201, concave surface; 202, convex surface; 203, grinding cavity; 204, convex side; 205, grinding side. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "include..." or "comprise..." do not exclude the existence of other elements in the process, method, article or terminal device including the elements. In addition, in this article, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself.

[0043] Embodiment 1

[0044] like Figure 1 and Figure 2 As shown, a solid material grinding device with adjustable discharge particle size comprises:

[0045] The grinding disc housing 4 is provided with an inlet 1, an outlet, a top rectifying air blow 17, a side rectifying air blow 104, and a center rectifying air blow 2;

[0046] The dynamic and static grinding discs 5 and 3 are coaxially arranged in the grinding disc cavity 16 in the grinding disc housing 4 with their grinding surfaces facing each other; the static grinding disc 3 is fixed to the grinding disc housing 4, and the dynamic grinding disc 5 is driven by a driving mechanism to rotate in the grinding disc housing 4 to grind the materials between the dynamic and static grinding discs 5 and 3; the dynamic grinding disc 5 is also connected to a pushing mechanism, and the pushing mechanism adjusts the distance between the dynamic and static grinding discs 5 and 3 by pushing and pulling;

[0047] The top rectifying air blow 17 blows air from above the dynamic and static grinding discs 5 and 3 along the radial direction of the dynamic and static grinding discs 5 and 3, the side rectifying air blow 104 blows air from the sides of the dynamic and static grinding discs 5 and 3 along the radial direction of the dynamic and static grinding discs 5 and 3, and the center rectifying air blow 2 blows air toward the center of the static grinding disc 3 along the axial direction of the dynamic and static grinding discs 5 and 3.

[0048] Specifically, a grinding disc cavity 16 is provided inside the grinding disc housing 4, and an inlet 1 and an outlet are provided on the grinding disc housing 4. A top rectifying air blow 17 is installed above the grinding disc housing 4, side rectifying air blows 104 are installed on the side walls on both sides, and a center rectifying air blow 2 is installed on the side wall facing the grinding disc cavity 16.

[0049] The dynamic and static grinding wheels 5 and 3 are placed in a grinding wheel chamber 16 in the grinding wheel housing 4 in a coaxial structure with grinding surfaces facing each other.

[0050] The shapes and structures of the dynamic and static grinding discs 5 and 3 are the same. Figure 5 As shown, the dynamic and static grinding discs 5 and 3 are both based on the grinding disc, with the center of the grinding surface of the grinding disc as the dot, and adjacent convex surfaces 202 and concave surfaces 201 are distributed in a fan shape on the grinding surface. The outer edge surrounding the convex surface 202 and the concave surface 201 on the grinding surface of the grinding disc is a grinding side edge 205. A grinding cavity 203 is formed between the dynamic grinding disc 5 and the static grinding disc 3, the concave surface 201 is connected to the grinding cavity 203, and the convex side edge 204 connects the concave surface 201 and the convex surface 202. The convex side edge 204 is inclined at a certain angle, and the inclined convex side edge 204 has a certain width.

[0051] like Figure 5 As shown, adjacent convex surfaces 202 and concave surfaces 201 form a group, and 2-6 groups of the concave and convex surfaces are arranged on the grinding surface of each circular grinding disc.

[0052] The driving mechanism includes a housing 19 , a central shaft 12 , a fixed bearing 13 , a sprocket 9 , and a transmission motor 101 .

[0053] A central shaft cavity 11 is provided in the housing 19, and a central shaft 12 is placed in the central shaft cavity 11 and one end of the central shaft 12 is coaxially connected to the dynamic grinding disc 5 (one end of the central shaft 12 is coaxially connected to the non-grinding surface of the dynamic grinding disc 5 that is opposite to the grinding surface).

[0054] To facilitate assembly, preferably, the end of the central shaft 12, the central shaft mounting seat 15, the dynamic grinding disc mounting seat 6 and the dynamic grinding disc 5 are coaxially connected in sequence (the dynamic grinding disc mounting seat 6 is coaxially connected to the non-grinding surface of the dynamic grinding disc 5 opposite to the grinding surface).

[0055] A plurality of fixed bearings 13 are sleeved on the central shaft 12 and are evenly distributed along the axial direction of the central shaft 12. The central shaft 12 together with the fixed bearings 13 can slide along the axial direction of the central shaft, wherein one side of 1-3 fixed bearings 13 has an annular groove 14, which is used to locate the maximum sliding distance of the central shaft 12.

[0056] The sprocket 9 is sleeved on the other end of the central shaft 12 and is placed outside the housing 19. The transmission motor 101 is transmission-connected to the sprocket 9 via a chain.

[0057] The housing 19 can be connected to the grinding disc housing 4, and the grinding disc housing 4 can be fixed on the base 103. The support base 102 is connected between the housing 19 and the base 103, and the support base 102 is used to support the housing 19. The transmission motor 101 can be fixed on the housing 19.

[0058] The push mechanism comprises a main cylinder 7, a bearing sleeve 18 and a connecting plate 10. The axial direction of the main cylinder 7 is parallel to the axial direction of the central axis 12, and the cylinder barrel of the main cylinder 7 can be horizontally placed on the base 103 and fixed to the base 103.

[0059] The bearing sleeve 18 is connected to a fixed bearing 13, such as Figure 1 As shown, the bearing sleeve 18 is connected to the fixed bearing 13 on the left end of the central shaft 12.

[0060] The connecting plate 10 is connected to the bearing sleeve 18 and the end of the piston rod in the master cylinder 7 respectively.

[0061] At least one limiting bolt 8 passes through the housing 19 and abuts against the connecting plate 10 , and the axial direction of the limiting bolt 8 is parallel to the axial direction of the central axis 12 .

[0062] like Figure 1As shown, the feed port 1 extends toward the center of the static grinding disc 3, and the feed port 1 extends obliquely into the static grinding disc 3. The feed port 1 is equipped with a feed hopper 107, and the discharge port is located at the bottom of the grinding disc housing 4, and a collection hopper 105 is installed on the discharge port.

[0063] The opening of the feed hopper 107 is provided with a top cover 111 which is opened and closed by a cover opening cylinder 109, and the top cover 111 is provided with a cylinder top cover rectifying air blowing 108 which blows air into the feed hopper 107, and the side of the feed hopper 107 near the top cover 111 is provided with a cylinder side wall rectifying air blowing 106 which blows air into the feed hopper 107.

[0064] The grinding method of the solid material grinding device with adjustable discharge particle size is as follows:

[0065] The material is fed into the grinding disc housing, and the material is rendered semi-fluidized through the interaction of the central rectifying air blowing 2, the top rectifying air blowing 17, and the side rectifying air blowing 104, and then the semi-fluidized material particles are broken by the relative movement of the dynamic grinding disc 5 and the static grinding disc 3.

[0066] The technical features of the solid material grinding device with adjustable discharge particle size in this embodiment are as follows: (1) No metal-metal collision occurs during the grinding process. The test material particles are crushed by the relative movement of the dynamic grinding disc 5 and the static grinding disc 3. The dynamic and static grinding discs 5 and 3 are both circular grinding discs as the main body, with the center of the grinding surface of the grinding disc as the center point, and adjacent convex surfaces 202 and concave surfaces 201 are distributed in a fan shape on the grinding surface. Adjacent convex surfaces 202 and concave surfaces 201 form a group, and 2-6 groups of the concave and convex surfaces are provided on the grinding surface of each circular grinding disc. The outer edge surrounding the convex surface 202 and concave surface 201 on the grinding surface of the grinding disc is a grinding side edge 205. The convex side edge 204 is inclined at a certain angle, and the inclined convex side edge has a certain width. A grinding cavity 203 (the grinding cavity 203 includes the gap between the dynamic grinding disc 5 and the static grinding disc 3) is formed between the dynamic grinding disc 5 and the static grinding disc 3, and the ground material is ground in the cavity. The concave surface 201 is connected to the grinding cavity 203, and both of them play the role of material storage. The convex side edge 204 connects the concave surface 201 and the convex surface 202. When the dynamic grinding disc rotates, the convex side edge 204 plays the role of cutting and crushing the material, and at the same time, some of the material is introduced into the gap between the convex surface 202, and the material is ground between the convex surface 202 and the grinding side edge 205 to particles of suitable particle size.

[0067] (2) Gas pretreatment. Use a refrigeration device to cool the gas entering the grinding device in advance. The refrigeration device can use compressor refrigeration, semiconductor refrigeration, vortex tube refrigeration, etc. The purpose of cooling the gas is to take away the heat in the grinding process, reduce the water vapor content in the gas, and prevent the moisture in the gas from affecting the ground material.

[0068] (3) Semi-fluidized gas. After the material enters the hopper 107, the material particles enter the grinding chamber 203 with the cooperation of the airflow provided by the cylinder top cover rectifying air blowing 108 and the cylinder side wall rectifying air blowing 106. In the grinding chamber 203, with the cooperation of the center rectifying air blowing 2, the top rectifying air blowing 17, and the side rectifying air blowing 104, the material is semi-fluidized, thereby increasing the contact probability between materials of different particle sizes and the grinding surface and improving the grinding efficiency. The gas can take away the heat generated by the collision, avoiding the influence of the temperature rise on the properties of the material particles; at the same time, it can take away particles with a particle size smaller than the gap between the grinding surfaces, avoiding repeated grinding, shortening the grinding time, and avoiding excessive particle size.

[0069] (4) Gas field rectification gas: There are 1-4 top rectification gas blows 17 and side rectification gas blows 104. After the gas of each rectification gas blow enters the central axis cavity 11, the flow field formed by the gas surrounds the dynamic and static grinding discs 5 and 3 to maintain a stable temperature; the granular products overflowing from the grinding surface are brought into the collecting hopper 105. After the grinding is completed, the rectification gas flow rate is increased to realize the purging function, and the residual materials in the grinding chamber are cleaned up in coordination with the grinding gap to change with a certain amplitude and frequency.

[0070] (5) The gap between the grinding surfaces is adjustable. The maximum particle size of the particles after grinding can be adjusted by adjusting the gap between the convex surfaces of the dynamic and static grinding discs 5 and 3. The position of the limit groove 14 and the limit bolt 8 determines the distance between the dynamic and static grinding surfaces. The dynamic grinding surface is fixed during the grinding process by the pressure of the main cylinder 7. After the main cylinder 7 is released, the distance between the dynamic and static grinding surfaces can be expanded to facilitate cleaning.

[0071] (6) Fixing of the central axis: The central axis 12 is fixed in the central axis cavity 11 through 2-6 fixed bearings 13. The dynamic grinding disc 5 and the dynamic grinding disc mounting seat 6 are fixed by 3-15 bolts. The bolts can be arranged in a concentric circle, square or other shape. The dynamic grinding disc 5 is fixed by bolts and the flatness of the grinding surface can be fine-tuned by bolts. The dynamic grinding disc mounting seat 6 is connected to the central axis mounting seat 15.

[0072] (7) Central axis sliding. The central axis 12 together with the fixed bearing 13 can slide along the central axis axial direction, wherein one side of 1-3 fixed bearings 13 has a limiting groove 14, which is an annular groove and is used to locate the maximum sliding distance of the central axis 12.

[0073] (8) One end of the central shaft 12 is connected to the end of the piston rod on the main cylinder 7 through the connecting plate 10, and the connecting plate 10 is connected to the bearing sleeve 18. The bearing sleeve 18 is connected to the fixed bearing 13 on the other end of the central shaft 12. The bearing sleeve 18 can drive the central shaft 12 to slide. The main cylinder 7 can drive the central shaft 12 to slide within a certain distance, thereby driving the dynamic grinding disc 5 to move and adjusting the distance between the dynamic and static grinding discs 5 and 3.

[0074] (9) Minimum gap adjustment: The connecting plate 10 is connected to the bearing sleeve 18. The minimum gap between the dynamic and static grinding discs 5 and 3 is determined by adjusting the length of the limit bolt 8 exposed from the connecting plate.

[0075] (10) Feeding method: The material is fed from the center of the static grinding disc 3 through the feed hopper 107. This method enables the material to quickly enter the grinding chamber, thereby improving efficiency; it is in close contact with the gas source, quickly enters a semi-fluidized state, and increases the probability of contact between the material and the grinding surface. When the solid material grinding device with adjustable discharge particle size is working, the cylinder side wall rectifying air blowing 106 and the cylinder top cover rectifying air blowing 108 continuously introduce a certain amount of gas to prevent the material from being blown back into the hopper.

[0076] (11) Collection of materials after grinding: The dynamic and static grinding discs 5 and 3 are provided with an annular grinding disc housing 4, and the grinding disc housing 4 is connected to the collecting hopper 105. A vent hole 110 is provided above the collecting hopper 105. The vent hole 110 contains replaceable filter cotton. By introducing gas into the vent hole 110, the discharge of materials in the collecting hopper 105 is accelerated.

[0077] The solid material grinding method and device with adjustable output particle size are suitable for the crushing process of solid minerals. The gap between the dynamic and static grinding discs is used to avoid metal collision during the grinding process, thereby improving energy utilization efficiency; reducing the temperature rise during the grinding process to ensure the stability of the mineral particle properties; and ensuring the accuracy of the product particle size by accurately controlling the grinding gap.

[0078] Embodiment 2

[0079] The solid material grinding device with adjustable discharge particle size in this embodiment is a further improvement based on the structure of the first embodiment, wherein the components identical or corresponding to the first embodiment are marked with the same reference numerals as the first embodiment. For simplicity, only the differences between the second embodiment and the first embodiment are described.

[0080] like Figure 3 and Figure 4 As shown, a vibrating screen 20 controlled by a vibrating motor 21 is installed at the outlet of the collecting hopper 105. (The vibrating screen 20 and the vibrating motor 21 can be selected from mature products already available on the market)

[0081] The collecting hopper 105 is connected to the feeding port through a material back-blowing pipe 22, and the collecting hopper 105 is also provided with a back-blowing air blower 112 which can be connected to the air blowing device, and the back-blowing air blower 112 is located on the side of the collecting hopper 105. When the solid material grinding device with adjustable discharge particle size is working, the back-blowing air blower 112 is connected to the air blowing device.

[0082] The solid material grinding device with adjustable discharge particle size in this embodiment can replace the vibration screen 20 with different apertures as needed, and the vibration screen 20 can vibrate under the drive of the vibration motor 21. Under the combined effect of vibration and airflow in the grinding disc cavity 16, particles smaller than the aperture of the vibration screen 20 fall down. During the grinding process, the vibration motor 21 can be turned on all the time or after a certain period of time.

[0083] After the grinding process has been carried out for a period of time, the transmission motor 101 and the vibrating screen 20 stop working, the distance between the dynamic and static grinding discs 5 and 3 increases, the remaining material in the grinding chamber 203 falls, and then the dynamic and static grinding discs 5 and 3 restore the previous distance. The vibration motor 21 starts for a period of time and then stops. The blowing device starts to blow back air, and the material on the vibrating screen 20 is sent back to the feed port 1 through the material backblowing pipe 112. The vibrating screen 20 can realize automatic material return, and the final material screening rate reaches 100%. This belongs to automatic material return.

[0084] After the grinding process has been going on for a while, the transmission motor 101 and the vibrating screen 20 stop working, the distance between the dynamic and static grinding discs 5 and 3 increases, the remaining material in the grinding chamber 203 falls, and then the dynamic and static grinding discs 5 and 3 restore the previous distance. The vibration motor 21 starts for a while and then stops. The vibrating screen 20 is manually removed and the material on the screen is poured back to the feed port 1. This operation is repeated until the material screening rate reaches 100%. This belongs to manual material return.

[0085] By adjusting the power of the vibration motor 21, or changing the main vibration direction and vibration frequency of the vibration motor 21, the vibration motor can drive the grinding chamber 203 to vibrate when working, so as to clean the surfaces of the dynamic and static grinding discs 5 and 3, and achieve the function of cleaning the inner surface of the grinding chamber 203. During self-cleaning, the distance between the dynamic and static grinding discs 5 and 3 changes, and the samples remaining on the surfaces of the dynamic and static grinding discs 5 and 3 are blown clean in conjunction with the continuous or pulsed gas provided by each air blow. Through the above action, the inner wall of the grinding chamber 203 and the screen of the vibration screen 20 can also be cleaned at the same time. The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that for ordinary technicians in this field, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A solid material grinding device with adjustable discharge particle size, characterized in that: include: The grinding disc housing is provided with an inlet, an outlet, a top rectifying air blow, a side rectifying air blow, and a center rectifying air blow; The dynamic and static grinding discs are coaxially arranged in the grinding disc cavity in the grinding disc housing with their grinding surfaces facing each other; the static grinding disc is fixed to the grinding disc housing, and the dynamic grinding disc is driven by a driving mechanism to rotate in the grinding disc housing to grind the material between the dynamic and static grinding discs; the dynamic grinding disc is also connected to a pushing mechanism, and the pushing mechanism adjusts the distance between the dynamic and static grinding discs by pushing and pulling; The top rectifying air blowing and the side rectifying air blowing blow air from above and from the sides of the dynamic and static grinding discs respectively along the radial direction of the dynamic and static grinding discs, and the center rectifying air blowing blows air toward the center of the static grinding disc along the axial direction of the dynamic and static grinding discs; The dynamic and static grinding discs have the same shape and structure; the dynamic and static grinding discs are both based on the grinding disc as the main body, with the center of the grinding surface of the grinding disc as the dot, and adjacent convex and concave surfaces are distributed in a fan shape on the grinding surface; the outer edge surrounding the convex and concave surfaces on the grinding surface of the grinding disc is the grinding side edge; a grinding cavity is formed between the dynamic grinding disc and the static grinding disc, the concave surfaces are connected to the grinding cavity, and the convex side edges connect the concave surfaces to the convex surfaces; adjacent convex surfaces and concave surfaces are a group, and 2-6 groups of concave and convex surfaces are arranged on the grinding surface of each grinding disc; The feed inlet extends toward the center of the static grinding disc, and a feed hopper is mounted on the feed inlet; a collecting hopper is mounted on the discharge port; A top cover is provided on the opening of the feed hopper, the opening and closing of which is controlled by a cover-opening cylinder. The top cover is provided with a cylinder top cover rectifying air blowing for blowing air into the feed hopper. A cylinder side wall rectifying air blowing for blowing air into the feed hopper is provided on the side of the feed hopper near the top cover.

2. The solid material grinding device with adjustable discharge particle size according to claim 1, characterized in that: The driving mechanism comprises: shell; A central shaft, which is placed in the central shaft cavity of the housing and one end of which is coaxially connected to the dynamic grinding disc; A plurality of fixed bearings, which are sleeved on the central shaft and evenly distributed along the axial direction of the central shaft; A sprocket, which is sleeved on the other end of the central shaft and is placed outside the housing; A transmission motor is connected to the sprocket through a chain.

3. The solid material grinding device with adjustable discharge particle size according to claim 2, characterized in that: The pushing mechanism comprises: A main cylinder, the axial direction of which is parallel to the axial direction of the central axis; A bearing sleeve connected to one of the fixed bearings; A connecting plate is respectively connected to the bearing sleeve and the end of the piston rod in the master cylinder.

4. The solid material grinding device with adjustable discharge particle size according to claim 3, characterized in that: At least one limiting bolt passes through the shell and abuts against the connecting plate, and the axial direction of the limiting bolt is parallel to the axial direction of the central axis.

5. The solid material grinding device with adjustable discharge particle size according to claim 1, characterized in that: A vibrating screen controlled by a vibrating motor is arranged at the outlet of the collecting hopper.

6. The solid material grinding device with adjustable discharge particle size according to claim 1, characterized in that: The collecting hopper is connected to the feeding port through a material back-blowing pipe, and the collecting hopper is also provided with a back-blowing air blower that can be connected to the blowing device.

7. The solid material grinding device with adjustable discharge particle size according to any one of claims 1 to 6, wherein the grinding method is as follows: The material is fed into the grinding disc housing, and is semi-fluidized through the interaction of center rectifying air blowing, top rectifying air blowing, and side rectifying air blowing. The semi-fluidized material particles are then broken up by the relative movement of the dynamic grinding disc and the static grinding disc.

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