Vertical grinding machine

Abstract

The present application provides a vertical grinding machine, which includes a grinding cylinder, a feed inlet, a discharge outlet, a filter screen and a stirring device. A grinding chamber and a diversion chamber that communicate with each other are formed inside the grinding cylinder. The grinding chamber is used to accommodate materials and grinding media, and the diversion chamber is used to collect the materials ground by the grinding media. The feed inlet is arranged at the lower part of the grinding cylinder and communicates with the grinding chamber. The discharge outlet is arranged at the upper part of the grinding cylinder and communicates with the diversion chamber. The filter screen is arranged inside the grinding cylinder and divides the internal space of the grinding cylinder into the grinding chamber and at least one diversion chamber. The stirring device is configured to stir the materials and the grinding media in the grinding chamber. The materials enter the grinding chamber from the feed inlet, the grinding media grind the materials, and the ground materials are collected in the diversion chamber through the filter screen and then discharged from the discharge outlet.

Description

Technical Field

[0001] The present application relates to the technical field of material grinding, and particularly to a vertical grinding machine. Background Art

[0002] Natural asphalt, also known as earth asphalt or mineral asphalt, has its light components evaporated, and then is polymerized by oxygen in the air under sunlight irradiation to become mineral asphalt, which mainly consists of asphaltene, resin and other colloids, as well as a small amount of other mineral impurities such as metals and non-metals. The natural asphalt ore is crushed and ground, and then a processing liquid is added to the ground asphalt powder to form a natural asphalt mixed slurry.

[0003] The existing vertical grinding machine for grinding natural asphalt includes a grinding cylinder, a feed inlet communicated with the upper part of the grinding cylinder, a discharge outlet communicated with the lower part of the grinding cylinder, and a filter screen arranged at the discharge outlet. The natural asphalt mixed slurry enters the grinding cylinder from the feed inlet under pressure. The grinding medium in the grinding cylinder, such as steel balls, grinds the natural asphalt particles to the required particle size. After the natural asphalt mixed slurry ground by the grinding medium passes through the filter screen, it is discharged from the discharge outlet. Since the natural asphalt mixed slurry at the discharge outlet is fed under pressure, and at the same time the grinding medium moves downward due to gravity, more and more grinding medium is deposited at the lower part of the grinding cylinder under the action of the natural asphalt mixed slurry and gravity. Too much grinding medium is likely to wear or block the filter screen located at the discharge outlet. Summary of the Invention

[0004] In view of this, the embodiments of the present application are expected to provide a vertical grinding machine to solve the technical problem that too much grinding medium in the prior art is likely to wear or block the filter screen located at the discharge outlet.

[0005] To achieve the above object, the technical solution of the present application is realized as follows:

[0006] The embodiments of the present application provide a vertical grinding machine, including:

[0007] A grinding cylinder, in which a mutually communicated grinding chamber and a diversion chamber are formed. The grinding chamber is used to accommodate materials and grinding medium, and the diversion chamber is used to collect the materials ground by the grinding medium;

[0008] A feed inlet, which is arranged at the lower part of the grinding cylinder and communicated with the grinding chamber;

[0009] A discharge outlet, which is arranged at the upper part of the grinding cylinder and communicated with the diversion chamber;

[0010] A filter screen, which is arranged in the grinding cylinder and divides the internal space of the grinding cylinder into the grinding chamber and at least one diversion chamber;

[0011] A stirring device, which is configured to stir the materials and the grinding medium in the grinding chamber;

[0012] The materials enter the grinding chamber from the feed port, the grinding medium grinds the materials, and the ground materials are collected in the diversion chamber through the filter screen and then discharged from the discharge port.

[0013] Further, the stirring device includes a stirring shaft, a driving source, and a plurality of stirrers. The driving source is arranged outside the grinding cylinder. One end of the stirring shaft is connected to the driving source, and the other end of the stirring shaft is suspended in the grinding chamber. The stirrers are arranged on the stirring shaft and located in the grinding chamber.

[0014] Further, each stirrer includes a mounting seat, a plurality of stirring rods, and a plurality of stirring blades. The mounting seat has a hollow mounting channel. The plurality of stirring rods are arranged at intervals on the outer periphery of the mounting seat. One end of each stirring rod is connected to the mounting seat, and the other end of each stirring rod is connected to the corresponding stirring blade. Each stirrer is cooperatively mounted with the stirring shaft through the mounting channel.

[0015] Further, the stirring blades of the stirrer near one end of the stirring shaft are configured to push the grinding medium towards the other end of the stirring shaft;

[0016] And / or, the stirring blades of the stirrer located between the two ends of the stirring shaft are configured to purely rotate and push the grinding medium;

[0017] And / or, the number of the stirring blades of the stirrer located at the two ends of the stirring shaft is more than the number of the stirring blades of the stirrer located between the two ends of the stirring shaft;

[0018] And / or, the stirring blades of two adjacent stirrers are aligned or misaligned.

[0019] Further, the filter screen is provided as a single layer or multiple layers.

[0020] Further, the diversion chamber surrounds the upper part of the grinding chamber;

[0021] Or, the diversion chamber is arranged above the grinding chamber.

[0022] Further, the vertical grinding machine further includes a positioning member, and the positioning member is connected to the suspended end of the stirring shaft.

[0023] Furthermore, the vertical grinder further includes a plurality of wear-resistant linings. Each wear-resistant lining includes a plurality of protrusions facing the inside of the grinding chamber, and the plurality of wear-resistant linings cover the inner wall of the grinding cylinder.

[0024] Furthermore, the vertical grinder further includes a heat conduction device configured to conduct heat into the grinding cylinder.

[0025] Furthermore, the grinding cylinder includes an outer cylinder body and an inner cylinder body arranged at intervals. The heat conduction device includes a heat conduction cavity formed between the outer cylinder body and the inner cylinder body and a flow guiding rib arranged in the heat conduction cavity. An oil inlet and an oil outlet respectively communicating with the heat conduction cavity are formed on the outer cylinder body. The flow guiding rib is configured to make the heat-conducting oil flow spirally along the circumferential direction of the inner cylinder body from the oil inlet to the oil outlet;

[0026] Or, the grinding cylinder includes an outer cylinder body and an inner cylinder body arranged closely. The heat conduction device includes a flow guiding groove formed on the inner side wall of the outer cylinder body and / or the outer side wall of the inner cylinder body. An oil inlet and an oil outlet respectively communicating with the flow guiding groove are formed on the outer cylinder body. The flow guiding groove is configured to make the heat-conducting oil flow spirally along the circumferential direction of the inner cylinder body from the oil inlet to the oil outlet.

[0027] In the vertical grinder provided by the embodiment of the present application, by arranging the feed inlet at the lower part of the grinding cylinder, the discharge outlet at the upper part of the grinding cylinder, and the filter screen in the grinding cylinder to divide the inner space of the grinding cylinder into a grinding chamber and at least one diversion chamber, the feed inlet communicates with the grinding chamber, and the discharge outlet communicates with the diversion chamber. Therefore, the filter screen is located at the upper part of the grinding chamber, avoiding abrasion or blockage of the filter screen caused by the grinding medium deposited at the lower part of the grinding cylinder. By accommodating a certain volume of materials in the diversion chamber, a buffer space is provided for the materials entering the diversion chamber, avoiding the directly passing of the ground materials through the filter screen into the discharge outlet arranged at the upper part of the grinding cylinder, avoiding excessive extrusion of the materials on the filter screen and damage to the filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of a vertical grinder in an embodiment of the present application;

[0029] Figure 2 is Figure 1 a cross-sectional view taken along the A-A direction in

[0030] Figure 3 is Figure 2 a cross-sectional view taken along the B-B direction in

[0031] Figure 4 is a schematic structural diagram of a stirrer in an embodiment of the present application;

[0032] Figure 5Schematic diagram of another vertical grinder in the embodiments of the present application;

[0033] Figure 6 Schematic diagram of a stirring device in the embodiments of the present application. The driving source is not shown, and the positioning member is shown. The direction indicated by the arrow in the figure is the rotation direction of the stirring shaft;

[0034] Figure 7 Schematic diagram of a wear-resistant inner lining in the embodiments of the present application;

[0035] Figure 8 Partial cross-sectional view of the grinding inner lining and the grinding cylinder in a vertical grinder in the embodiments of the present application;

[0036] Figure 9 Schematic diagram of a heat conduction device in the embodiments of the present application;

[0037] Figure 10 Schematic diagram of another heat conduction device in the embodiments of the present application;

[0038] Figure 11 Schematic diagram of yet another heat conduction device in the embodiments of the present application.

[0039] Description of reference numerals

[0040] Grinding cylinder 10; grinding chamber 10a; diversion chamber 10b; outer cylinder 11; oil inlet 11a; oil outlet 11b; inner cylinder 12; diversion rib 13; diversion groove 13'; feed inlet 20; discharge outlet 30; filter screen 40; first filter screen 41; second filter screen 42; stirring device 50; stirring shaft 51; driving source 52; stirrer 53; mounting base 531; mounting channel 531a; stirring rod 532; stirring blade 533; material-facing surface 533a; grinding medium 60; positioning member 70; wear-resistant inner lining 80; protrusion 81; counterbore 82; first end face 82a; heat conduction device 90; heat conduction chamber 90a; connecting member 100; second end face 100a. Detailed implementation manners

[0041] It should be noted that, without conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other. The detailed description in the detailed implementation manners should be understood as an explanatory illustration of the purpose of the present application and should not be regarded as an improper limitation to the present application.

[0042] In the description of the present application, the orientation or positional relationship of "upper", "lower", "top", and "bottom" is based on the normal use state of the vertical grinder, as shown in the attached Figure 2Regarding the orientation or positional relationship shown, it should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0043] An embodiment of the present application provides a vertical grinding machine. Please refer to Figure 1 and Figure 2 , which includes a grinding cylinder 10, a feed inlet 20, a discharge outlet 30, a filter screen 40, and a stirring device 50. A grinding chamber 10a and a diversion chamber 10b that communicate with each other are formed inside the grinding cylinder 10. The grinding chamber 10a is used to accommodate materials and grinding media 60, and the diversion chamber 10b is used to collect the materials ground by the grinding media 60; the feed inlet 20 is arranged at the lower part of the grinding cylinder 10 and communicates with the grinding chamber 10a; the discharge outlet 30 is arranged at the upper part of the grinding cylinder 10 and communicates with the diversion chamber 10b; the filter screen 40 is arranged inside the grinding cylinder 10 and divides the internal space of the grinding cylinder 10 into the grinding chamber 10a and the diversion chamber 10a; the stirring device 50 is configured to stir the materials and the grinding media 60 in the grinding chamber 10a; the materials enter the grinding chamber 10a from the feed inlet 20, the grinding media 60 grind the materials, and the ground materials are collected in the diversion chamber 10b after passing through the filter screen 40 and then discharged from the discharge outlet 30.

[0044] Under the action of pressure, the material enters the grinding chamber 10a through the feed port 20 provided at the lower part of the grinding cylinder 10 and mixes with the grinding medium 60 in the grinding chamber 10a. The material moves from bottom to top in the grinding cylinder 10 under the action of pressure. The material to be ground with larger particle size is located at the lower part of the grinding cylinder 10, and the material with smaller particle size after grinding is located at the upper part of the grinding cylinder 10. During the upward movement of the material in the grinding cylinder 10, the grinding medium 60 moves downward under the action of its own gravity, and the material and the grinding medium 60 form opposite movement directions. At the same time, the stirring device 50 stirs the material and the grinding medium 60 in the grinding chamber 10a. Therefore, most of the grinding medium 60 is evenly mixed with the material under the action of pressure, gravity and the agitation of the stirring device. The high-frequency contact between the material and the grinding medium 60 makes the grinding of the material by the grinding medium 60 more sufficient and the grinding effect better. A small part of the grinding medium 60 gradually deposits at the lower part of the grinding cylinder 10 under the action of gravity, so that a higher density of the grinding medium 60 is distributed at the lower part of the grinding cylinder 10. Another small part of the grinding medium 60 is mixed in the material and is carried by the material to the upper part of the grinding cylinder 10. The grinding medium 60 carried upward by the material moves at a slower speed under the action of its own gravity and has a smaller extrusion force on the filter screen 40, so the filter screen 40 will not be worn. With the action of gravity, the grinding medium 60 carried upward by the material gradually moves downward. Therefore, there is less grinding medium at the upper part of the grinding cylinder 10 and the density is smaller, which will not block the filter screen 40. In addition, since the discharge port 30 is provided at the upper part of the grinding cylinder 10 and the filter screen 40 is used to filter the material after grinding, the filter screen 40 must be located and will also be located at the upper part of the grinding cylinder 10 relatively. Therefore, the grinding medium 60 deposited at the lower part of the grinding cylinder 10 will not cause wear or blockage to the filter screen 40. The material after grinding enters the diversion chamber 10b through the filter screen 40. The diversion chamber 10b can accommodate a certain volume of material, so that the material entering the diversion chamber 10b has a buffer space, avoiding the material after grinding directly passing through the filter screen 40 and entering the discharge port 20 provided at the upper part of the grinding cylinder 10, and avoiding excessive extrusion of the filter screen 40 by the material and damage to the filter screen 40.

[0045] When the above-mentioned grinder is used to grind natural asphalt mixed slurry or other materials in a fluid state, the feed inlet 20 is arranged at the lower part of the grinding cylinder 10, and the discharge outlet 30 is arranged at the upper part of the grinding cylinder 10. The material moves from bottom to top under pressure. The fluid-state material has viscosity. The solid grinding medium 60 is less affected by the pressure in the grinding cylinder 10. The grinding medium 60 carried upward by the material is affected by the viscous force of the material. Under the combined action of gravity, compared with the upward movement speed of the material, the upward movement speed of the grinding medium 60 is slower and the inertia is smaller, and the impact force on the filter screen 40 is small. Therefore, when the above-mentioned grinder is used to grind natural asphalt mixed slurry or other materials in a fluid state, it can better reduce the wear and blockage of the grinding medium 60 on the filter screen 40.

[0046] In one embodiment of the present application, please refer to Figure 2 , the stirring device 50 includes a stirring shaft 51, a driving source 52 and a plurality of stirrers 53. The driving source 52 is arranged outside the grinding cylinder 10. One end of the stirring shaft 51 is connected to the driving source 52, and the other end of the stirring shaft 51 is suspended in the grinding chamber 10a. The stirrers 53 are arranged on the stirring shaft 51 and are located in the grinding chamber 10a. By driving the stirring shaft 51 to rotate through the driving source 52, the stirring shaft 51 drives the stirrers 53 to move. The stirrers 53 stir the material and the grinding medium 60 in the grinding chamber 10a, so that the material and the grinding medium are more evenly mixed and contact more frequently, making the grinding of the material by the grinding medium 60 more sufficient and the grinding effect better.

[0047] In one embodiment of the present application, please refer to Figures 2 - 4 , each stirrer 53 includes a mounting seat 531, a plurality of stirring rods 532 and a plurality of stirring blades 533. The mounting seat 531 has a hollow mounting channel 531a. The plurality of stirring rods 532 are arranged at intervals on the outer periphery of the mounting seat 531. One end of each stirring rod 532 is connected to the mounting seat 531, and the other end of each stirring rod 532 is connected to the corresponding stirring blade 533. Each stirrer 53 is cooperatively installed with the stirring shaft 51 through the mounting channel 531a.

[0048] A plurality of stirring rods 532 and a plurality of stirring blades 533 are arranged on the mounting seat 531. The stirring blades 533 are installed on the mounting seat 531 through the stirring rods 532. First, it is convenient to adjust the installation angle of the stirring blades 533. Second, the stirring rods 532 make the stirring blades 533 closer to the side wall of the grinding chamber 10a, and the stirring range is wider. In addition, the stirring rods 532 occupy less space than the stirring blades 533. In the case of making the stirring blades 533 closer to the side wall of the grinding chamber 10a, the material and the grinding medium 60 have a larger accommodation space, making the stirring more sufficient and the mixing of the grinding medium 60 and the material more uniform.

[0049] In one embodiment, the agitator 53 is detachably connected to the stirring shaft 51, which may be a key connection such as a flat key or a spline, or a pin connection, a screw connection, etc., such as a threaded connection or a bolt fastening connection. The detachable connection between the agitator 53 and the stirring shaft 51 avoids the need to disassemble the entire stirring device 50 for repair due to the damage of the agitator 53 during use. It can not only replace the agitator 53 conveniently and quickly, but also save costs and reduce the maintenance time.

[0050] In one embodiment, the other end of each stirring rod 532 is detachably connected to the corresponding stirring blade 533, which may be a key connection such as a flat key or a spline, or a pin connection, a screw connection, etc. Since the stirring blade 533 is a consumable part, during use, due to the continuous friction and collision of the material and the grinding medium 60, the stirring blade 533 may be deformed or damaged. The detachable connection is adopted to avoid replacing the entire agitator 53, which is not only convenient for replacing the stirring blade 533, but also can save costs and reduce the maintenance time.

[0051] In one embodiment of the present application, please refer to Figure 2 、 Figure 5 and Figure 6 , the stirring blade 533 of the agitator 53 near one end of the stirring shaft 51 is configured to push the grinding medium 60 towards the other end of the stirring shaft 51. For example, the blade 533 of the agitator 53 near the upper end of the stirring shaft 51 is configured to push the grinding medium 60 downward, or the blade 533 of the agitator 53 near the lower end of the stirring shaft 51 is configured to push the grinding medium 60 upward, or the blade 533 of the agitator 53 near the upper end of the stirring shaft 51 is configured to push the grinding medium 60 downward and the blade 533 of the agitator 53 near the lower end of the stirring shaft 51 is configured to push the grinding medium 60 upward at the same time. This design avoids the excessive flow of the grinding medium 60 to the upper or lower part of the vertical grinder, further avoids the wear or blockage of the filter screen 40 by the grinding medium 60, makes the grinding medium 60 more evenly distributed around the agitator 53, and enables the grinding medium 60 to be in full contact with the material within the range where the agitator 53 is located for grinding.

[0052] Specifically, the material receiving surface 533a of the stirring blade 533 of the stirrer 53 near the upper end of the stirring shaft 51 is inclined upward, and the eddy current formed by the stirring blade 533 drives the grinding medium 60 downward. The material located in the upper part of the grinding chamber 10a moves upward from bottom to top under the action of pressure. After the material is ground, the particle size of the material near the upper end of the stirring shaft 51 is smaller, and the grinding medium 60 is relatively larger. Since the material receiving surface 533a is inclined upward, the stirring blade 533 forms a downward eddy current, driving the mixture of the solid grinding medium 60 and the material downward. The solid grinding medium 60 is less affected by the pressure in the grinding cylinder 10. The grinding medium 60 carried upward by the material moves upward slower and has less inertia under its own gravity compared to the upward movement speed of the material, and is more likely to move downward faster under the action of the eddy current. Although the material will also move downward under the action of the eddy current, compared with the grinding medium 60, due to the smaller particle size and lighter weight of the material, it is less affected by the downward driving of the eddy current, and the material still moves upward at a relatively fast speed. Therefore, the material located in the upper part of the grinding chamber 10a continues to move upward from bottom to top under the action of pressure, while the grinding medium 60 moves downward under the action of its own gravity and the eddy current, and the material and the grinding medium 60 are gradually separated. The material receiving surface 533a of the stirring blade 533 of the stirrer 53 near the lower end of the stirring shaft 51 is inclined downward, and the stirring blade 533 drives the grinding medium 60 upward. The downward inclination of the material receiving surface 533a forms an upward eddy current. The material located in the lower part of the grinding chamber 10a moves upward from bottom to top under the action of pressure, and the grinding medium 60 moves upward under the action of the eddy current and the material.

[0053] When the above-mentioned grinder is used to grind natural asphalt mixed slurry or other materials in a fluid state, the fluid-state material has viscosity. The solid grinding medium 60 is less affected by the pressure in the grinding cylinder 10, and the fluid-state material is more affected by the pressure in the grinding cylinder 10. The grinding medium 60 carried upward by the material moves upward slower and has less inertia under its own gravity compared to the upward movement speed of the material. Therefore, the grinding medium 60 located in the upper part of the grinding cylinder 10 is more likely to move downward under the action of the downward eddy current. The grinding medium 60 located in the lower part of the grinding cylinder 10 moves upward under the action of the material and the upward eddy current.

[0054] It can be understood that the stirrer 53 near one end of the stirring shaft 51 is configured to push the grinding medium 60 towards the other end of the stirring shaft 51. One stirrer 53 can be provided, or two, or multiple, such as three, four, five, or six, etc.

[0055] The material-facing surface 533a of the stirring blade 533 refers to the surface of the stirring blade 533 that forms a surface for axially extruding the material towards the stirring shaft 51 along the rotation direction of the stirring shaft 51. Here, "axially extruding the material towards the stirring shaft" should be understood as having at least a component force for axially extruding the material along the stirring shaft 51. For example, if the material-facing surface 533a is inclined downward, the stirring blade 533 forms component forces for axially upward and radially outward extrusion of the material towards the stirring shaft 51; if the material-facing surface 533a is inclined upward, the stirring blade 533 forms component forces for axially downward and radially outward extrusion of the material towards the stirring shaft 51.

[0056] In an embodiment of the present application, please refer to Figure 2 、 Figure 5 and Figure 6 , the stirring blades 533 of the stirrer 53 located between the two ends of the stirring shaft 51 are configured to purely rotate and push the grinding medium 60. With this design, it is avoided that the grinding medium 60 moves upward or downward under the action of the stirrer 53 located between the two ends of the stirring shaft 51, so that the grinding medium 60 and the material are mixed together and repeatedly collide and rub against each other within the range of the above-mentioned stirrer 53, and the grinding medium 60 and the material are fully contacted and ground within the range where the stirrer 53 is located.

[0057] Specifically, the stirring blades 533 of the stirrer 53 located between the two ends of the stirring shaft 51 are horizontally arranged, and the horizontally arranged stirring blades 533 purely rotate and push the grinding medium 60.

[0058] In an embodiment of the present application, please refer to Figure 2 , the number of the stirring blades 533 of the stirrer 53 located at the two ends of the stirring shaft 51 is more than the number of the stirring blades 533 of the stirrer 53 located between the two ends of the stirring shaft 51. With this design, the more the number of the stirring blades 533 of the stirrer 53 located at the two ends of the stirring shaft 51, the denser the arrangement of the stirring blades 533, the smaller the gap between the stirring blades 533, and the more difficult it is for the solid grinding medium 60 to bypass the stirring blades 533 and approach the upper or lower part of the grinding chamber 10a. Further, it is avoided that too much of the grinding medium 60 flows to the upper or lower part of the vertical grinder, so that the grinding medium 60 forms a suspended state and can be more evenly distributed around the stirrer 53, improving the grinding efficiency of the material.

[0059] In an embodiment of the present application, please refer to Figure 2 、 Figure 3 and Figure 6, the stirring blades 533 of two adjacent stirrers 53 are staggeredly installed. Since the stirrers 53 are arranged on the stirring shaft 51, that is to say, two adjacent stirrers 53 are arranged vertically, and the stirring blades 533 of the stirrer 53 located above and the stirring blades 533 of the stirrer 53 located below are staggered from each other, so that the stirring range is wider and the stirring is more sufficient. In other embodiments, the stirring blades 533 of two adjacent stirrers 53 can also be aligned and installed.

[0060] In one embodiment of the present application, please refer to Figure 2 , the diversion chamber 10b surrounds the upper part of the grinding chamber 10a. The diversion chamber 10b and the grinding chamber 10a form a structure with a "T" - shaped cross - section. Since the filter screen 40 divides the internal space of the grinding cylinder 10 into the grinding chamber 10a and the diversion chamber 10b, and the diversion chamber 10b surrounds the upper part of the grinding chamber 10a, the filter screen 40 is annular. One end of the filter screen 40 is connected to the top wall of the diversion chamber 10b, and the other end of the filter screen 40 is connected to the side wall of the diversion chamber 10b. This design can also enable the filter screen 40 to have a larger filtering area, facilitate the ground materials in the grinding chamber 10a to enter the diversion chamber 10b faster, avoid the blockage of the filter screen 40 by materials, and improve the working efficiency of the grinder.

[0061] In one embodiment of the application, please refer to Figure 5 , the diversion chamber 10b is arranged above the grinding chamber 10a. The diversion chamber 10b and the grinding chamber 10a form a structure with a "T" - shaped cross - section. In other embodiments, the diversion chamber 10b and the grinding chamber 10a can also form a cylindrical structure (not shown), that is, both the outer cylinder 11 and the inner cylinder 12 are cylindrical. Since the filter screen 40 divides the internal space of the grinding cylinder 10 into the grinding chamber 10a and the diversion chamber 10b, and the diversion chamber 10b is arranged above the grinding chamber 10a, the filter screen 40 is planar. The outer periphery of the filter screen 40 is connected to the side wall of the grinding chamber 10a, and the area of the filter screen 40 is equal to the cross - sectional area of the grinding chamber 10a, so that the filter screen 40 has a larger filtering area, which is convenient for the ground materials in the grinding chamber 10a to enter the diversion chamber 10b faster and improves the working efficiency of the grinder.

[0062] In order to prevent the grinding medium from entering the diversion chamber from the grinding chamber due to the wear or damage of a single - layer filter screen. In one embodiment of the present application, the filter screen 40 is arranged as a single layer or multiple layers. For example, the filter screens 40 in Figure 2 and Figure 5 can be used separately, or the filter screens 40 in Figure 2 and Figure 5In combination with the filter screen 40 therein, that is, the filter screen 40 is arranged in two layers. The first-layer filter screen is the second filter screen 42 arranged horizontally in a planar shape, and the second-layer filter screen is the first filter screen 41 arranged vertically in a ring shape. The second filter screen 42 divides the internal space of the grinding cylinder 10 into a grinding chamber 10a and a diversion chamber 10b. The first filter screen 41 is located in the diversion chamber 10b and divides the diversion chamber 10b into two sub-diversion chambers. The diversion chamber 10b and the grinding chamber 10a form a structure with a "T"-shaped cross-section. In other embodiments, the multi-layer filter screen may be one or more of horizontal arrangement, inclined arrangement, and vertical arrangement.

[0063] In one embodiment of the present application, please refer to Figure 2 and Figure 5 , the vertical grinding machine further includes a positioning member 70, and the positioning member 70 is connected to the suspended end of the stirring shaft 51. The positioning member 70 is used to reduce the deviation of the lower end of the stirring shaft 51 during rotation. Since the grinding medium 60 gradually settles to the bottom of the grinding chamber 10a under the action of gravity, that is to say, the density of the grinding medium 60 at the bottom of the grinding chamber 10a is greater than that of the grinding medium 60 at other positions in the grinding chamber 10a. The non-stirred bottom grinding medium 60 remains relatively stationary, and the grinding medium 60 at least partially surrounds the periphery of the positioning member 70. The relatively dense grinding medium 60 is used to limit the deviation of the positioning member 70, strengthen the positioning effect of the positioning member 70, and further reduce the deviation of the lower end of the stirring shaft 51.

[0064] When the above grinding machine is used to grind natural asphalt mixed slurry or other materials in a fluid state, the fluid-state material has viscosity, and the grinding medium 60 deposited at the bottom of the grinding chamber 10a is bonded into a relatively stable whole, which is equivalent to providing a relatively stable "mounting seat" for the positioning member 70, further strengthening the positioning effect on the positioning member 70, and further reducing the deviation of the lower end of the stirring shaft 51.

[0065] In one embodiment of the present application, please refer to Figure 2 、 Figure 3 、 Figure 5 、 Figure 7, the vertical grinding machine further includes a plurality of wear-resistant linings 80. Each wear-resistant lining 80 includes a plurality of protrusions 81 facing the inside of the grinding chamber 10a, and the plurality of wear-resistant linings 80 cover the inner wall of the grinding chamber 10a. On the one hand, the protrusions 81 effectively increase the surface area of contact between the wear-resistant lining 80 and the material and the grinding medium 60, enabling the wear-resistant lining 80 to be used for a longer time. On the other hand, in the form of the protrusions 81, the surface area of the wear-resistant lining 80 can be increased over a large area without occupying too much space inside the grinding chamber 10a. Thirdly, the protrusions 81 increase the roughness of the surface of the wear-resistant lining 80 close to the grinding chamber 10a, increasing the frictional force between the wear-resistant lining 80 and the material, so that the material can be ground to the required particle size more quickly. In one embodiment, the heights of the plurality of protrusions 81 are not equal. In another embodiment, the heights of the plurality of protrusions 81 are equal.

[0066] In one embodiment of the present application, please refer to Figure 8 , the vertical grinding machine includes a connecting member 100. A counterbore 82 is formed in the wear-resistant lining 80, and the connecting member 100 fixes the wear-resistant lining 80 to the inner wall of the grinding chamber 10a through the counterbore 82. The distance between the first end face 82a of the counterbore 82 close to the inner wall of the grinding chamber 10a and the second end face 100a of the connecting member 100 close to the inner wall of the grinding chamber 10a is C, where C > 0.

[0067] The connecting member 100 can be a screwed member such as a bolt, a screw, a stud, etc. The second end face 100a has a structure for applying force to the connecting member 100, such as a slotted head or a Phillips head, etc.

[0068] The distance between the first end face 82a and the second end face 100a is greater than zero, that is, the end face of the connecting member 100 close to the grinding chamber 10a is located inside the counterbore 82. During the use of the grinding machine, the material fills into the counterbore 82, covering the end face of the connecting member 100 close to the grinding chamber 10a, avoiding the structure such as a slotted head or a Phillips head on the end face of the connecting member 100 close to the grinding chamber 10a from being worn by the moving grinding medium 60 and the material.

[0069] In one embodiment of the present application, please refer to Figure 8 , the value range of the distance C between the first end face 82a and the second end face 100a can be selected as: 5mm ≤ C ≤ 10mm.

[0070] If C < 5 mm, the filling amount of the material in the counterbore 82 is too small, and the grinding medium 60 in motion may scrape the end face of the connecting member 100 close to the grinding chamber 10a. If C > 10 mm, the thickness of the position where the wear-resistant lining 80 is connected to the connecting member 100 is too thin, affecting the stability of the connection between the connecting member 100 and the wear-resistant lining 80. If 5 mm ≤ C ≤ 10 mm, it can not only ensure that there is enough filling amount of the material in the counterbore 82, effectively avoiding the grinding medium 60 in motion from scraping the end face of the connecting member 100 close to the grinding chamber 10a, but also ensure that the thickness of the position where the wear-resistant lining 80 is connected to the connecting member 100 is thick enough to ensure the stable connection between the connecting member 100 and the wear-resistant lining 80.

[0071] In one embodiment of the present application, please refer to Figure 2 and Figure 3 , the cross-section of the inner wall of the grinding cylinder 10 is circular, and the wear-resistant lining 80 is plate-shaped. Along the cross-section direction of the grinding cylinder 10, a plurality of wear-resistant linings 80 form a regular polygon inscribed in the grinding cylinder 10. The number of sides of the regular polygon is preferably 6 to 10.

[0072] Due to the requirement of wear resistance, the wear-resistant lining 80 usually has a high hardness. Making the wear-resistant lining 80 into a plate shape is convenient for manufacturing and processing. It can be understood that a plurality of wear-resistant linings 80 form a regular polygon inscribed in the inner wall of the grinding cylinder 10, that is, a plurality of wear-resistant linings 80 are successively inscribed in the inner wall of the grinding cylinder 10 to form the grinding chamber 10a, and the cross-section of the grinding chamber 10a is a regular polygon. When a polygon is inscribed in a circle, the area of the regular polygon is the largest. That is to say, when the cross-section of the inner wall of the grinding cylinder 10 is circular, under the condition that the volume of the grinding cylinder 10 is certain, when the grinding chamber 10a formed by a plurality of wear-resistant linings 80 is a regular polygon, the cross-sectional area is the largest, the volume of the grinding chamber 10a is the largest, and more materials and grinding media 60 can be accommodated in the grinding chamber 10a.

[0073] Since the smaller the number of wear-resistant linings 80, the fewer the number of sides of the formed regular polygon, the smaller the area of the regular polygon, and the larger the gap between the wear-resistant lining 80 and the grinding cylinder 10, which will greatly reduce the effective use space of the grinding cylinder 10; the larger the number of wear-resistant linings 80, although it will increase the effective use space of the grinding cylinder 10, it also increases the number of wear-resistant linings 80 used, increasing the workload of processing, installation and maintenance of the wear-resistant lining 80. In addition, when the number of sides of the regular polygon is greater than 10, the increase in the effective use space of the grinding cylinder is small. Therefore, the number of sides of the regular polygon is 6 to 10. For example, 6, 7, 8, 9, 10, corresponding to the cross-sections of the grinding chamber 10a formed by a plurality of wear-resistant linings 80 being hexagon, heptagon, octagon, nonagon and decagon respectively. This design can not only ensure a large effective use space of the grinding cylinder 10, but also ensure a reasonable number of wear-resistant linings 80 used.

[0074] In order to heat the material, in one embodiment of the present application, please refer to Figure 2 and Figure 3 , the vertical grinder further includes a heat conduction device 90 configured to conduct heat into the grinding cylinder 10.

[0075] It can be understood that when the above-mentioned grinder is used to grind liquid natural asphalt mixture or other materials that need to be heated during grinding, heat needs to be transferred into the grinding cylinder 10 so that the natural asphalt mixture or other materials maintain a certain temperature to keep them in a viscous liquid state, that is, a fluid state.

[0076] In one embodiment of the present application, please refer to Figure 9 , the grinding cylinder 10 includes an outer cylinder 11 and an inner cylinder 12 arranged at intervals. The heat conduction device 90 includes a heat conduction cavity 90a formed between the outer cylinder 11 and the inner cylinder 12 and a guide rib 13 arranged in the heat conduction cavity 90a. An oil inlet 11a and an oil outlet 11b respectively communicating with the heat conduction cavity 90a are formed on the outer cylinder 11. The guide rib 13 is configured to make the heat-conducting oil flow spirally along the circumferential direction of the inner cylinder 12 from the oil inlet 11a to the oil outlet 11b. The heat-conducting oil enters the heat conduction cavity 90a from the oil inlet 11a, and under the guidance of the guide rib 13, the heat-conducting oil flows spirally along the circumferential direction of the inner cylinder 12 to the oil outlet 11b. During the circumferential spiral flow of the heat-conducting oil in the heat conduction cavity 90a, the heat-conducting oil transfers heat to the inner cylinder 12 and then to the grinding cavity 10a, thereby maintaining the temperature of the material. The guide rib 13 is helically fixed on the inner cylinder 12 by means of threaded connection, welding or embedded connection.

[0077] It should be noted that other heat-conducting liquids can also be arranged in the heat conduction cavity, as long as the high-temperature liquid in the heat conduction cavity can transfer heat to the material in the grinding cavity to maintain the temperature of the material.

[0078] In another embodiment, please refer to Figure 10 , the grinding cylinder 10 includes an outer cylinder 11 and an inner cylinder 12 arranged closely. The heat conduction device 90 includes a guide groove 13' formed on the inner side wall of the outer cylinder 11. An oil inlet 11a and an oil outlet 11b respectively communicating with the guide groove 13' are formed on the outer cylinder 11. The guide groove 13' is configured to make the heat-conducting oil flow spirally along the circumferential direction of the inner cylinder 12 from the oil inlet 11a to the oil outlet 11b. In other embodiments, the guide groove 13' can also be formed on the outer side wall of the inner cylinder 12, or formed on the inner side wall of the outer cylinder 11 and the outer side wall of the inner cylinder 12 at the same time. The guide groove 13' on the inner side wall of the outer cylinder 11 and the guide groove 13' on the outer side wall of the inner cylinder 12 are arranged in alignment or stagger.

[0079] In still another embodiment, refer to Figure 11, a plurality of annular diversion grooves 13' are respectively formed on the inner side wall of the outer cylinder 11 and the outer side wall of the inner cylinder 12. In other embodiments, a plurality of annular diversion grooves 13' can also be formed only on the inner side wall of the outer cylinder 11 or on the outer side wall of the inner cylinder 12. Correspondingly, the oil inlet 11a and the oil outlet 11b are respectively arranged in one-to-one correspondence with a plurality of diversion grooves 13'.

[0080] It can be understood that in one embodiment, please refer to Figure 9 and Figure 10 , the oil inlet 11a is formed above the outer cylinder 11, and the oil outlet 11b is formed below the outer cylinder 11. The heat-conducting oil enters the heat-conducting cavity 90a from the oil inlet 11a located above the outer cylinder 11, flows circumferentially around the inner circumference of the heat-conducting cavity 90a, and finally flows out from the oil outlet 11b located below the outer cylinder 11. In another embodiment, the oil inlet 11a is formed below the outer cylinder 11, and the oil outlet 11b is formed above the outer cylinder 11. The heat-conducting oil enters the heat-conducting cavity 90a from the oil inlet 11a located below the outer cylinder 11, flows circumferentially around the inner circumference of the heat-conducting cavity 90a, and finally flows out from the oil outlet 11b located above the outer cylinder 11.

[0081] In another embodiment of the present application, the heat-conducting device 90 includes an oil guide pipe (not shown) spirally wound around the outer wall of the grinding cylinder 10, and the oil guide pipe is configured with flowing heat-conducting oil. The oil guide pipe can be in a spiral form or spirally wound around the outer wall of the grinding cylinder 10 in a ring shape.

[0082] The above-mentioned "spiraling" means that at least part of the heat-conducting oil travels at least one circle along the grinding cylinder 10 from the oil inlet 11a and then reaches the oil outlet 11b. Figure 11 The "spiraling" in

[0083] means that the heat-conducting oil travels half a circle to both sides along the grinding cylinder 10 from the oil inlet 11a and then reaches the oil outlet 11b, and the actual travel is still at least one circle. During the traveling process, the heat-conducting oil heats the area of the inner cylinder 12 passed by, extends the flowing path of the heat-conducting oil, prevents the heat-conducting oil from flowing from the oil inlet 11a to the oil outlet 11b along the shortest path, ensures uniform heating of the inner cylinder 12, and thus maintains the temperature stability of the material during the production process.

[0084] In one embodiment, a heat insulation and heat preservation layer can be provided on the outer side wall of the grinding cylinder 10 to insulate and heat-preserve the heat-conducting cavity 90a or the diversion groove 13'.

[0085] The vertical grinding machine in the embodiments of this application can be used for grinding natural asphalt or other materials.

[0086] As described above, it is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

1. A vertical grinding machine, characterized in that, For grinding materials in a fluid state, including: A grinding cylinder, within which a grinding chamber and a diversion chamber are formed and interconnected. The grinding chamber is used to accommodate the materials and the grinding medium, and the diversion chamber is used to collect the materials ground by the grinding medium; A feed inlet, which is arranged at the lower part of the grinding cylinder and is in communication with the grinding chamber; A discharge outlet, which is arranged at the upper part of the grinding cylinder and is in communication with the diversion chamber; A filter screen, which is arranged inside the grinding cylinder and divides the internal space of the grinding cylinder into the grinding chamber and at least one diversion chamber; A stirring device, which is configured to stir the materials and the grinding medium in the grinding chamber; The materials enter the grinding chamber from the feed inlet, the grinding medium grinds the materials, and the ground materials are collected into the diversion chamber through the filter screen and then discharged from the discharge outlet; The stirring device includes a stirring shaft and a plurality of stirrers. One end of the stirring shaft is suspended in the grinding chamber, and the stirrers are arranged on the stirring shaft and are located in the grinding chamber; each stirrer includes a plurality of stirring blades; The stirring blades of the stirrer near the upper end of the stirring shaft are configured to push the grinding medium downward, and the stirring blades of the stirrer near the lower end of the stirring shaft are configured to push the grinding medium upward; the stirring blades of the stirrers located between the two ends of the stirring shaft are configured to push the grinding medium in a pure rotation manner to prevent the grinding medium from moving upward or downward under the action of the stirrers located between the two ends of the stirring shaft; the number of stirring blades of the stirrers located at the two ends of the stirring shaft is more than the number of stirring blades of the stirrers located between the two ends of the stirring shaft; Wherein, the material-facing surface of the stirring blades of the stirrer near the upper end of the stirring shaft is inclined upward, and the material-facing surface of the stirring blades of the stirrer near the lower end of the stirring shaft is inclined downward.

2. The vertical grinding machine according to claim 1, wherein, The stirring device includes a driving source, which is arranged outside the grinding cylinder, and one end of the stirring shaft is connected to the driving source.

3. The vertical grinding machine according to claim 2, wherein Each stirrer includes a mounting seat and a plurality of stirring rods. The mounting seat has a hollow mounting channel, and the plurality of stirring rods are arranged at intervals on the outer periphery of the mounting seat. One end of each stirring rod is connected to the mounting seat, and the other end of each stirring rod is connected to the corresponding stirring blade. Each stirrer is cooperatively mounted with the stirring shaft through the mounting channel.

4. The vertical grinding machine according to claim 3, characterized in that, The stirring blades of two adjacent stirrers are mounted in alignment or in a staggered manner.

5. The vertical grinding machine according to claim 1, characterized in that, The filter screen is provided as a single layer or multiple layers.

6. The vertical grinding machine according to claim 1, characterized in that, The diversion chamber surrounds the upper part of the grinding chamber; Or, the diversion chamber is arranged above the grinding chamber.

7. The vertical grinding machine according to any one of claims 2 to 6, characterized in that The vertical grinding machine further includes a positioning member, which is connected to the suspended end of the stirring shaft.

8. The vertical grinding machine according to any one of claims 1 to 6, characterized in that The vertical grinding machine further includes a plurality of wear-resistant linings. Each wear-resistant lining includes a plurality of protrusions facing the inside of the grinding chamber, and the plurality of wear-resistant linings cover the inner wall of the grinding cylinder.

9. The vertical grinding machine according to any one of claims 1 to 6, characterized in that, The vertical grinding machine further includes a heat conduction device, which is configured to conduct heat into the grinding cylinder.

10. The vertical grinding machine according to claim 9, wherein, The grinding cylinder includes an outer cylinder body and an inner cylinder body which are arranged at intervals. The heat conduction device includes a heat conduction cavity formed between the outer cylinder body and the inner cylinder body and flow guiding ribs arranged in the heat conduction cavity. An oil inlet and an oil outlet which are respectively communicated with the heat conduction cavity are formed on the outer cylinder body. The flow guiding ribs are configured such that heat conducting oil spirally flows from the oil inlet along the circumferential direction of the inner cylinder body to the oil outlet; Alternatively, the grinding cylinder includes an outer cylinder body and an inner cylinder body which are closely arranged. The heat conduction device includes flow guiding grooves formed on the inner side wall of the outer cylinder body and / or the outer side wall of the inner cylinder body. An oil inlet and an oil outlet which are respectively communicated with the flow guiding grooves are formed on the outer cylinder body. The flow guiding grooves are configured such that heat conducting oil spirally flows from the oil inlet along the circumferential direction of the inner cylinder body to the oil outlet.

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