A screen assembly for a grinder and methods of use and a grinder

Abstract

The application discloses a screen device of a grinding machine, the grinding machine comprising a grinding cylinder for accommodating grinding medium and material, the screen device comprising a screen seat, a screen, a discharge pipe, a first fixing part and a second fixing part, the screen being installed on the screen seat and used for separating the ground material from the grinding medium; the discharge pipe being connected with the screen seat and used for conveying the material filtered through the screen to a conveying pipe; the first fixing part being used for being connected with the grinding cylinder; the second fixing part being used for being connected with the conveying pipe; the screen seat being rotatably connected with the first fixing part, and the discharge pipe being rotatably connected with the second fixing part, and the screen seat and the discharge pipe being rotated to change the installation angle of the screen. The application changes the connecting structure and the use method of the screen device, adjusts the installation angle of the screen according to the abrasion condition of the screen, improves the utilization rate of the screen and prolongs the service life of the screen.

Description

Technical Field

[0001] This application relates to the field of powder grinding technology, and in particular to a screen device for a grinding mill, its usage method, and the grinding mill itself. Background Technology

[0002] In the production of natural asphalt, a grinding mill is needed to grind the natural asphalt particles to a finer size. According to the structural characteristics of the grinding mill, the grinding mill cavity is filled with a large amount of grinding media. In order to separate the grinding material from the grinding media during the operation of the equipment, the equipment is equipped with a screen. The gap of the screen is smaller than the diameter of the grinding media. The material flows out from the gap of the screen, while the grinding media is blocked and isolated, thereby realizing the separation of the grinding media from the material.

[0003] In related technologies, the screen installation device is fixedly welded or connected with fasteners and fixed to the discharge end cover of the sand mill. After the grinding material passes through the screen, it flows out from the discharge pipe of the mill. Once the bottom of the screen is worn through, the screen is basically unusable. Summary of the Invention

[0004] In view of this, the present application aims to provide a screen device for a grinder, a method of using the same, and a grinder, so as to extend the service life of the screen.

[0005] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0006] One aspect of this application provides a screen device for a grinding mill, the grinding mill including a grinding cylinder for containing grinding media and materials, the screen device comprising:

[0007] Screen holder;

[0008] A screen, installed on the screen holder, is used to separate the ground material from the grinding media;

[0009] The discharge pipe is connected to the screen holder and is used to transport the material filtered by the screen to the conveying pipe.

[0010] A first fixing member is used for connection with the grinding cylinder; and

[0011] The second fastener is used to connect to the delivery pipe;

[0012] The screen base is rotatably connected to the first fixing member, and the discharge pipe is rotatably connected to the second fixing member. Rotating the screen base and the discharge pipe can change the installation angle of the screen.

[0013] Furthermore, the screen device includes a rotating component, which is disposed between the screen base and the first fixed component, and / or between the discharge pipe and the second fixed component.

[0014] Furthermore, the rotating component is a ball bearing;

[0015] Both the screen holder and the first fixing member have a first groove, and the two first grooves together form a first raceway, in which the ball is disposed; and / or, both the discharge pipe and the second fixing member have a second groove, and the two second grooves together form a second raceway, in which the ball is disposed.

[0016] Furthermore, the first fixing member is provided with a first through hole, the first through hole communicating with the first groove, and the ball is installed onto the first raceway through the first through hole; and / or,

[0017] The second fastener is provided with a second through hole, which connects to the second groove, and the ball is installed onto the second raceway through the second through hole.

[0018] Furthermore, the screen device includes a sealing ring;

[0019] The screen holder and the first fixing member both have the third groove, and the two third grooves together form a first annulus, on which the sealing ring is provided; and / or, the discharge pipe and the second fixing member both have the fourth groove, and the two fourth grooves together form a second annulus, on which the sealing ring is provided.

[0020] Furthermore, the screen holder includes a base and a protrusion, the screen is mounted on the base, and the protrusion is connected to the base so that the screen holder forms a step shape inward along the outer periphery of the base. The first fixing member is rotatably connected to the outer periphery of the protrusion, and the side of the first fixing member is in contact with the stepped surface of the base. The screen device also includes a sealing member, which is disposed between the stepped surface of the base and the side of the first fixing member.

[0021] Furthermore, the discharge pipe includes a detachably connected connecting pipe and a rotating pipe, the connecting pipe being connected to the screen base, and the rotating pipe being rotatably connected to the second fixing member.

[0022] Furthermore, the screen device also includes a clamping member, one end of which is connected to the screen base and the other end of which is connected to the first fixing member.

[0023] Furthermore, the first fixing member has a plurality of mounting holes arranged in a circumferential array, one end of the clamping member is fixed to the screen base, and the other end can be selectively fixed to one of the mounting holes.

[0024] A second aspect of this application provides a grinding mill, comprising:

[0025] Grinding cylinder, used to hold grinding media and materials; and

[0026] The aforementioned screen device is connected to the grinding cylinder and is used to separate the ground material from the grinding medium.

[0027] A third aspect of this application provides a method of using a screen device for a grinder, comprising:

[0028] Connect the screen holder with the screen to the grinding cylinder, and connect the discharge pipe to the conveying pipe;

[0029] After the preset working time, rotate the screen holder and the discharge pipe to change the installation angle of the screen.

[0030] The sieve device and its usage method provided in this application embodiment include a sieve installed on a sieve base, a first fixing member connected to a grinding cylinder, a second fixing member connected to a conveying pipe, a sieve base rotatably connected to the first fixing member, and a discharge pipe rotatably connected to the second fixing member. The grinding material is separated from the grinding media through the sieve and transported to the conveying pipe via the discharge pipe. After the sieve device has been working for a period of time, the installation angle of the sieve is changed by rotating the sieve base and the discharge pipe. This application embodiment improves the utilization rate of the sieve and extends its service life by changing the connection structure and usage method of the sieve device to adjust the installation angle of the sieve according to its wear condition. Attached Figure Description

[0031] Figure 1 This is a schematic diagram showing the wear range of the screen in a grinding machine.

[0032] Figure 2 This is a schematic diagram of the structure of a screening device provided in an embodiment of this application;

[0033] Figure 3 for Figure 2 A sectional view;

[0034] Figure 4 This is a schematic diagram of the structure of a screen holder and a discharge pipe provided in an embodiment of this application;

[0035] Figure 5 for Figure 4 A structural diagram from another perspective, showing the ball bearings;

[0036] Figure 6 for Figure 2 Schematic diagram of the rotating tube

[0037] Figure 7 for Figure 2 Schematic diagram of the structure of the first fixing component;

[0038] Figure 8 for Figure 2 Schematic diagram of the structure of the second fastener;

[0039] Figure 9 A grinding machine provided in an embodiment of this application;

[0040] Figure 10 A flowchart illustrating a method of using a sieve device provided in an embodiment of this application.

[0041] Explanation of reference numerals in the attached figures

[0042] Grinding machine 1; grinding cylinder 11; screen device 12; first raceway 12a; second raceway 12b; first annular raceway 12c; second annular raceway 12d; first groove 12e; second groove 12f; third groove 12g; fourth groove 12h; screen seat 121; heating medium inlet / outlet pipe 1211; screen 122; discharge pipe 123; connecting pipe 1231; rotating pipe 1232; first fixing member 124; first through hole 1241; mounting hole 1242; third through hole 1243; second fixing member 125; second through hole 1251; rotating member 126; ball bearing 1261; sealing ring 127; sealing member 128; clamping member 129; conveying pipe a. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0044] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. The terms "first," "second," etc., used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly including at least one feature. In the description of the embodiments of this application, "multiple" means at least two, that is, including two or more, such as two or three, unless otherwise explicitly specified. In the description of the embodiments of this application, the orientation or positional relationship of "upper" and "lower" refers to the orientation or positional relationship when the grinding machine is in normal use. It should be understood that these orientational terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0045] In the production of natural asphalt, a grinding mill is needed to grind the asphalt particles to a finer size. Based on the mill's structural characteristics, the mill chamber contains a large amount of grinding media. During operation, to separate the grinding material from the grinding media, a screen is installed. The screen openings are smaller than the diameter of the grinding media. The material flows out through the screen openings, while the grinding media is blocked and isolated, thus achieving separation. In related technologies, the screen device is fixedly welded or connected with fasteners, and fixed to the mill's discharge end cover. However, during use, due to wear from the grinding media, the more severely worn side of the screen is generally on the lower part (e.g., the...). Figure 1 (The shaded area) Once the bottom of the screen is worn through, the screen is basically unusable. At this point, the wear on other screen surfaces above the screen is relatively small. Screen devices in related technologies have a short service life, require time and effort to maintain, increase operating costs, and cause great waste.

[0046] In view of this, please refer to Figures 2-9 In a first aspect, this application provides a screen device 12 for a grinding mill. The grinding mill includes a grinding cylinder 11 for containing grinding media and materials. The screen device 12 includes a screen base 121, a screen 122, a discharge pipe 123, a first fixing member 124, and a second fixing member 125.

[0047] Screen 122 is mounted on screen holder 121 and is used to separate the ground material from the grinding media. Screen 122 can be made of wear-resistant materials, such as carbon steel, manganese steel, or stainless steel for metals, and nylon, rubber, or polyurethane for non-metals, to increase its service life. Specifically, screen 122 can be made of polyurethane, which features high wear resistance, high elasticity, high strength, and strong self-cleaning ability, thereby greatly improving screening and production efficiency. The gaps in screen 122 are smaller than the size of the grinding media but larger than the size of the ground material to achieve separation of the ground material from the grinding media.

[0048] The discharge pipe 123 is connected to the screen holder 121 and is used to convey the material filtered by the screen 122 to the conveying pipe a. Specifically, the discharge pipe 123 passes through the screen holder 121, with one end connected to the end face of the screen holder 121 where the screen 122 is installed. The material filtered by the screen 122 enters the discharge pipe 123 and is conveyed through the discharge pipe 123 to the conveying pipe a, and discharged outside the grinder. The conveying pipe a is generally fixedly installed in the production plant and is used to convey the ground material to the next process.

[0049] The first fixing member 124 is used to connect with the grinding cylinder 11. The connection method between the first fixing member 124 and the grinding cylinder 11 is not limited; it can be a non-detachable connection such as welding or riveting. To facilitate the installation of the screen device 12, a detachable connection such as a threaded connection or a snap-fit ​​connection can also be used. For example, a third through hole 1243 is provided on the first fixing member 124. Specifically, the third through hole 1243 is a threaded hole, and the first fixing member 124 is threadedly connected to the grinding cylinder 11. The second fixing member 125 is used to connect with the conveying pipe a, which can be a threaded connection or a flange connection. For example, the second fixing member 125 is flanged to the conveying pipe a. The end of the second fixing member 125 connected to the conveying pipe a forms a flange, and then a sealing gasket is added between the two flanges. Finally, the two flanges are tightened with bolts to make them tightly connected.

[0050] The screen base 121 is rotatably connected to the first fixing member 124, and the discharge pipe 123 is rotatably connected to the second fixing member 125. Specifically, a rotating member 126 may be provided between the screen base 121 and the first fixing member 124 and / or the discharge pipe 123 and the second fixing member 125, or the screen base 121 may rotate through corresponding grooves provided between the first fixing member 124 and / or the discharge pipe 123 and the second fixing member 125. For example, the screen base 121 may be provided with a convex rail, and the first fixing member 124 may be provided with an annular groove. The screen base 121 may rotate within the groove of the first fixing member 124 via the convex rail. The discharge pipe 123 and the second fixing member 125 may have the same configuration. Rotating the screen base 121 and the discharge pipe 123 will cause the screen 122 to rotate, thereby changing the installation angle of the screen 122.

[0051] Specifically, Figure 1 A schematic diagram of the wear range of screen 122 is shown, where the mesh of screen 122 is not shown. The surface of screen 122 where wear from the abrasive media is most severe is located at the bottom of screen 122, for example... Figure 1 The shaded area corresponds to the 5-7 o'clock position on a clock. It can be understood that the grinder is a horizontal grinder, and the bottom of the screen 122 refers to the side vertically away from the center of the screen 122. After the screen device 12 has been working for a period of time, rotating the screen base 121 and the discharge pipe 123 causes the screen 122 to rotate, thereby changing the installation angle of the screen 122. See [link / reference needed]. Figure 1The double-headed arrow indicates that the rotation direction of the screen 122 can be either clockwise or counterclockwise. In the screen device 12 provided in this embodiment, after the screen device 12 has been working for a period of time, the installation angle of the screen 122 is changed by rotating the screen base 121 and the discharge pipe 123. That is, the surface of the screen 122 that suffers more wear from the grinding media is primarily located at the bottom of the screen 122. After the bottom of the screen 122 is worn, the grinder stops working, and the screen base 121 and the discharge pipe 123 are rotated, so that the bottom of the screen 122 is replaced by a less worn part, such as the upper or side part of the screen 122. This application improves the utilization rate of the screen 122 and extends its service life by changing the installation angle of the screen 122 through an improved structure of the screen device 12.

[0052] It is understandable that rotating the screen base 121 and the discharge pipe 123 to rotate the screen 122 and change its installation angle is suitable for situations where the screen 122 can still function normally. The screen 122 functioning normally means that it can separate the ground material from the grinding media. If the screen 122 cannot function normally, it needs to be replaced.

[0053] In one embodiment, the screen device 12 includes a rotating member 126. The rotating member 126 can be disposed between the screen base 121 and the first fixed member 124, or between the discharge pipe 123 and the second fixed member 125. Alternatively, the rotating member 126 can be disposed simultaneously between the screen base 121 and the first fixed member 124 and between the discharge pipe 123 and the second fixed member 125. It is understood that if the screen base 121 and the first fixed member 124 or the discharge pipe 123 and the second fixed member 125 are not provided with a rotating member 126, they can be rotated through the track groove structure in the above embodiment.

[0054] The form of the rotating component 126 is not limited; it can be a ball bearing 1261 or a slider. For example, the rotating component 126 can be a ball bearing 1261, disposed between the screen holder 121 and the first fixed member 124, forming a bearing-like structure. Alternatively, the rotating component 126 can be a slider, disposed between the screen holder 121 and the first fixed member 124, with one of the screen holder 121 and the first fixed member 124 having a slider and the other having a track. The screen holder 121 rotates by sliding the slider on the track.

[0055] In one embodiment, please refer to Figures 2-5 and Figure 7When the screen holder 121 and the first fixing member 124 are equipped with a rotating member 126, the rotating member 126 is a ball bearing 1261. It is understood that there are multiple balls bearing 1261, which cause the screen holder 121 to rotate rapidly. Both the screen holder 121 and the first fixing member 124 have a first groove 12e. The cross-sectional shape of the first groove 12e can be a square groove or a semi-circular groove. To better accommodate the balls bearing 1261, it can be set as a semi-circular groove. The two first grooves 12e together form a first raceway 12a, and the balls bearing 1261 are disposed within the first raceway 12a, allowing them to roll along the first raceway 12a. The screen holder 121 rotates via rolling balls 1261. Compared to a screen without rotating parts 1261, rolling friction reduces frictional resistance, preventing wear on the screen holder 121 and the first fixed part 124 due to prolonged rotation. The rotation of the balls 1261 also increases the rotation speed, making rotation easier and enhancing the user experience. After a period of use, the service life of the first raceway 12a can be extended by adding lubricant.

[0056] In one embodiment, please refer to Figures 2-8 When the discharge pipe 123 and the second fixing member 125 are equipped with a rotating member 126, the rotating member 126 is a ball bearing 1261. Both the discharge pipe 123 and the second fixing member 125 have a second groove 12f, which together form a second raceway 12b. The ball bearing 1261 is placed in the second raceway 12b and can roll along the second raceway 12b. The discharge pipe 123 rotates by the rolling of the ball bearing 1261. Compared with not having a rotating member 126, the rolling friction reduces the frictional resistance and prevents wear on the discharge pipe 123 and the second fixing member 125 due to long-term rotation. The rotation of the ball bearing 1261 also increases the rotation speed, making it easier to rotate and enhancing the operating experience.

[0057] There can be multiple first raceways 12a and second raceways 12b. For details, please refer to [link / reference needed]. Figure 3 The symmetry plane shown in the figure refers to the symmetry plane of the first fixing member 124 when the mounting hole 1242 is not opened, that is, the first fixing member 124 is symmetrical on both sides of the symmetry plane shown in the figure. Two first raceways 12a and two second raceways 12b are each provided, wherein the first groove 12e is symmetrically arranged on both sides of the symmetry plane, and the second groove 12f is symmetrically arranged on both sides of the symmetry plane. Therefore, two first raceways 12a are symmetrically formed on both sides of the symmetry plane of the first fixing member 124, and two second raceways 12b are symmetrically formed on both sides of the symmetry plane of the second fixing member 125. By providing two first raceways 12a and two second raceways 12b, compared with a single raceway, the structure is more stable, the stress is more evenly distributed, and the service life of the first raceways 12a and two raceways 12b is extended.

[0058] In one embodiment, please refer to Figure 7The first fixing member 124 is provided with a first through hole 1241, which connects to the first groove 12e. The ball 1261 is installed onto the first raceway 12a through the first through hole 1241. To facilitate quick installation of the ball 1261, the first fixing member 124 is rotated so that the first through hole 1241 is positioned above the first groove 12e. The first through hole 1241 can be a threaded hole or a pin hole. For example, if the first through hole 1241 is a threaded hole, after the ball 1261 is installed, it is sealed with bolts to prevent the ball 1261 from rolling out through the first through hole 1241 during rolling. By providing the first through hole 1241, the installation of the ball 1261 is facilitated, resulting in a compact, efficient, convenient, and easy-to-implement structure.

[0059] In one embodiment, please refer to Figure 8 The second fixing member 125 is provided with a second through hole 1251, which connects to the second groove 12f. The ball 1261 is installed onto the second raceway 12b through the second through hole 1251. To facilitate quick installation of the ball 1261, the second fixing member 125 is rotated so that the second through hole 1251 is positioned above the second groove 12f. The second through hole 1251 can be a threaded hole or a pin hole. For example, if the second through hole 1251 is a pin hole, after the ball 1261 is installed, an interference fit is made using a pin to prevent the ball 1261 from rolling out through the second through hole 1251 during rolling. The interference fit between the pin and the pin hole means that the pin is inserted into the pin hole and presses against the wall of the pin hole. By providing the second through hole 1251, the installation of the ball 1261 is facilitated, resulting in a compact, efficient, convenient, and easy-to-implement structure.

[0060] In one embodiment, please refer to Figure 3The screen device 12 also includes a sealing element 128. The material of the sealing element 128 is not limited and can be silicone, fluorosilicone rubber, or nylon, etc. The screen holder 121 includes a base and a protrusion. The screen 122 is mounted on the base, and the protrusion is connected to the base so that the screen holder 121 forms a step shape inward along the outer periphery of the base. The first fixing member 124 is rotatably connected to the outer periphery of the protrusion, and the side of the first fixing member 124 is in contact with the stepped surface of the base. It can be understood that the stepped surface refers to the side of the base where the protrusion is provided. For example, the first fixing member 124 is annular and is sleeved on the protrusion of the screen holder 121. The inner ring of the first fixing member 124 is rotatably connected to the protrusion of the screen holder 121, and the side of the first fixing member 124 is in contact with the stepped surface of the screen holder 121. The sealing element 128 is disposed between the stepped surface of the base and the side of the first fixing member 124. It is understandable that there is a certain gap between the side of the first fixing member 124 and the screen base 121. During the operation of the grinding machine, material will splash inside the grinding cylinder 11. By setting the sealing member 128, the material inside the grinding cylinder 11 is sealed to reduce the leakage of the ground material. That is, to reduce the occurrence of material overflowing from the grinding cylinder 11 through the gap during the operation of the grinding machine, and to reduce the material from entering the inner ring of the first fixing member 124 and affecting the rotation of the first fixing member 124 and the screen base 121, thereby extending the service life of the screen device 12.

[0061] In one embodiment, the screen device 12 includes a sealing ring 127. The sealing ring 127 can be disposed between the screen base 121 and the first fixing member 124, or between the discharge pipe 123 and the second fixing member 125, or simultaneously between the screen base 121 and the first fixing member 124, and between the discharge pipe 123 and the second fixing member 125. Exemplarily, both the screen base 121 and the first fixing member 124 have a third groove 12g, and the two third grooves 12g together form a first annular channel 12c. The sealing ring 127 is disposed on the first annular channel 12c for sealing the rotatable connection between the screen base 121 and the first fixing member 124. It is understood that the sealing ring 127 reduces the entry of dust and other foreign matter into the rotatable connection. Both the discharge pipe 123 and the second fixing member 125 have a fourth groove 12h. The two fourth grooves 12h together form a second annulus 12d. A sealing ring 127 is provided on the second annulus 12d for sealing the rotatable connection between the discharge pipe 123 and the second fixing member 125. The material of the sealing ring 127 is not limited and can be nitrile rubber, polyurethane rubber, or metal rubber, etc.

[0062] For example, when the screen device 12 is not equipped with the rotating part 126, the screen base 121 and the first fixing part 124 are rotatably connected through the above-mentioned track groove structure. The sealing ring 127 can reduce the entry of debris into the annular groove and protect the track groove structure from failure due to debris blockage.

[0063] Exemplarily, the screen holder 121 and the first fixing member 124 are rotatably connected via a rotating member 126. Specifically, when the rotating member 126 is a ball bearing 1261, the first annular channel 12c is located on the adjacent outer side of the first raceway 12a. A sealing ring 127 is used to seal the ball bearing 1261. The sealing ring 127 reduces the intrusion of foreign matter such as dust into the raceway; when adding lubricant for maintenance of the first raceway 12a, the sealing ring 127 ensures that the lubricant only acts on the ball bearing 1261 and the first raceway 12a without overflowing.

[0064] In one embodiment, please refer to Figures 2-5 The discharge pipe 123 includes a detachably connected connecting pipe 1231 and a rotating pipe 1232. The connecting pipe 1231 is connected to the screen holder 121, for example, by welding. The rotating pipe 1232 is rotatably connected to a second fixing member 125. The connecting pipe 1231 and the rotating pipe 1232 can be connected by threads or flanges. Specifically, the connecting pipe 1231 and the rotating pipe 1232 are connected by flanges, with the ends of the connecting pipe 1231 and the rotating pipe 1232 forming flanges. A sealing gasket is then placed between the two flanges, and finally, bolts are used to tighten the two flanges to make them tightly joined. The connecting pipe 1231 and the rotating pipe 1232 can also be connected by threads, with one of the connecting pipe 1231 and the rotating pipe 1232 having internal threads and the other having external threads, connected by mutual mating. By making the connecting pipe 1231 and the rotating pipe 1232 detachably connected, it is convenient to disassemble and inspect them when the rotation of the rotating pipe 1232 is obstructed.

[0065] In one embodiment, please refer to Figures 2-3 The screen device 12 also includes a clamping member 129, one end of which is connected to the screen base 121, and the other end is connected to the first fixing member 124. The clamping member 129 can be block-shaped, strip-shaped, or irregularly shaped. The connection method between the clamping member 129, the screen base 121, and the first fixing member 124 can be a pin connection or a bolt connection, etc. The clamping member 129 clamps and fixes the screen base 121 and the first fixing member 124 to facilitate the operation of the screen device 12. When the installation angle of the screen 122 needs to be changed, the screen 122 can be rotated by disassembling the clamping member 129. By clamping and fixing the screen base 121 and the first fixing member 124 with the clamping member 129, the screen device 12 has a more compact structure and saves space.

[0066] For example, please refer to Figure 7The first fixing member 124 has a plurality of mounting holes 1242 arranged in a circumferential array. One end of the clamping member 129 is fixed to the screen holder 121, and the other end can be selectively fixed to one of the mounting holes 1242. The mounting hole 1242 can be a threaded hole or a pin hole. When the mounting hole 1242 is a threaded hole, the other end of the clamping member 129 is fixed to the first fixing member 124 by a bolt; when the mounting hole 1242 is a pin hole, the other end of the clamping member 129 is fixed to the first fixing member 124 by a pin. By setting a plurality of mounting holes 1242 arranged in a circumferential array, after the screen holder 121 rotates, a suitable mounting hole 1242 can be selected to fix the clamping member 129 according to the wear degree and range of the screen 122, reducing the design size requirements of the clamping member 129 and saving costs.

[0067] In one embodiment, please refer to Figures 2-5 The screen holder 121 includes two heating medium inlet / outlet pipes 1211, each with an inlet and outlet. One pipe is used to add the heating medium, and the other is used to discharge it. Specifically, the heating medium can be hot oil. During the operation of the screen device 12, hot oil is added to one heating medium inlet / outlet pipe 1211, while simultaneously discharging hot oil from the other pipe. This continuous circulation of the heating medium through the inlet / outlet pipes 1211 accelerates the separation of the ground material from the grinding media, providing convenience, speed, and improved efficiency.

[0068] The second aspect of the embodiments of this application is referred to. Figure 9 A grinding mill 1 is provided, including a grinding cylinder 11 and the aforementioned screen device 12. The grinding cylinder 11 is used to contain grinding media and materials, and the screen device 12 is connected to the grinding cylinder 11 to separate the ground materials from the grinding media.

[0069] The grinding machine 1 can be a vertical grinding machine 1 or a horizontal grinding machine 1, etc.

[0070] For a third aspect of the embodiments of this application, please refer to Figure 10 A method for using a screen device in a grinding mill is provided, applicable to any of the screen devices described above, the method of use including:

[0071] S1. Connect the screen holder with the screen to the grinding cylinder, and connect the discharge pipe to the conveying pipe;

[0072] S2. After the preset working time, rotate the screen holder and discharge pipe to change the installation angle of the screen.

[0073] Understandably, the preset time is determined based on the screen's lifespan, which refers to the elapsed time before the screen can no longer separate the ground material from the grinding media under normal grinding conditions. The preset time is less than the screen's lifespan. Specifically, the preset time is determined by calculating the lifespan of different screen materials.

[0074] The usage method of the embodiments of this application will be described in detail below with reference to specific embodiments of the rotary screen 122.

[0075] For example, the screen holder 121 with the screen 122 is connected to the grinding cylinder 11, and the discharge pipe 123 is connected to the conveying pipe a. After the grinding machine 1 has been in operation for a preset time, the contact surface between the screen 122 and the grinding media is worn, with the bottom being severely worn. The grinding machine 1 is then stopped. By rotating the screen holder 121 and the discharge pipe 123 in the same direction, the screen 122 is rotated, and the bottom of the screen 122 is replaced with the less worn part of the screen 122. The grinding machine 1 is then restarted.

[0076] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A screen device for a grinding mill, the grinding mill comprising a grinding cylinder for containing grinding media and material, the material being natural bitumen, characterized in that, The sieve device includes: Screen holder; A screen, installed on the screen holder, is used to separate the ground material from the grinding media; The discharge pipe is connected to the screen holder and is used to transport the material filtered by the screen to the conveying pipe. A first fixing member is used for connection with the grinding cylinder; and The second fastener is used to connect to the delivery pipe; The screen base is rotatably connected to the first fixing member, and the discharge pipe is rotatably connected to the second fixing member. Rotating the screen base and the discharge pipe can change the installation angle of the screen. The screen device includes a rotating component, which is disposed between the screen base and the first fixed component; the rotating component is also disposed between the discharge pipe and the second fixed component. The rotating component is a ball bearing, disposed between the screen base and the first fixing member, forming a bearing-like structure. Both the screen base and the first fixing member have a first groove, which together form a first raceway. The ball bearing is disposed within the first raceway and can roll along it. Both the discharge pipe and the second fixing member have a second groove, which together form a second raceway. The ball bearing is disposed within the second raceway and can roll along it. The screen device includes a sealing ring; the screen base and the first fixing member are both formed with a third groove, and the two third grooves together form a first annular channel, on which the sealing ring is disposed; the discharge pipe and the second fixing member are both formed with a fourth groove, and the two fourth grooves together form a second annular channel, on which the sealing ring is disposed; The screen holder includes a base and a protrusion. The screen is mounted on the base, and the protrusion is connected to the base so that the screen holder forms a step shape inward along the outer periphery of the base. The first fixing member is rotatably connected to the outer periphery of the protrusion, and the side of the first fixing member is in contact with the stepped surface of the base. The screen device also includes a sealing member, which is disposed between the stepped surface of the base and the side of the first fixing member.

2. The screen device according to claim 1, characterized in that, The first fixing member is provided with a first through hole, which communicates with the first groove, and the ball is installed onto the first raceway through the first through hole; and / or, The second fastener is provided with a second through hole, which connects to the second groove, and the ball is installed onto the second raceway through the second through hole.

3. The sieve device according to claim 1, characterized in that, The discharge pipe includes a detachably connected connecting pipe and a rotating pipe. The connecting pipe is connected to the screen base, and the rotating pipe is rotatably connected to the second fixing member.

4. The sieve device according to claim 1, characterized in that, The screen device further includes a clamping member, one end of which is connected to the screen base and the other end of which is connected to the first fixing member.

5. The screen device according to claim 4, characterized in that, The first fixing member has a plurality of mounting holes arranged in a circumferential array. One end of the clamping member is fixed to the screen base, and the other end can be selectively fixed to one of the mounting holes.

6. A grinding machine, characterized in that, include: A grinding cylinder is used to hold grinding media and materials. as well as The screen device according to any one of claims 1 to 5 is connected to the grinding cylinder and is used to separate the ground material from the grinding medium.

7. A method of using a screen device for a grinding mill, characterized in that, The method of using the sieve device according to any one of claims 1 to 5 includes: Connect the screen holder with the screen to the grinding cylinder, and connect the discharge pipe to the conveying pipe; After the preset working time, rotate the screen holder and the discharge pipe to change the installation angle of the screen.

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