Tail wheel device of drum screen

Abstract

The utility model discloses a tail wheel device of a drum screen. The tail wheel device comprises a tail wheel base, a circular truncated cone tail wheel, a rolling bearing, a tail wheel upper gland and a tail wheel lower gland, the tail wheel base comprises a vertical tail wheel base shaft; a mounting convex column is arranged at the upper part of the tail wheel base shaft and comprises a bearing mounting part and a gland mounting part which are arranged up and down; the rolling bearing is sleeved on the bearing mounting part, the interior of the circular truncated cone tail wheel is hollow, two ends of the circular truncated cone tail wheel are communicated, and the circular truncated cone tail wheel is sleeved on the outer side of the rolling bearing and sleeved with the bearing outer ring 32; the outer side wall of the circular truncated cone tail wheel is a circular truncated cone side surface; the tail wheel upper gland and the tail wheel lower gland are respectively locked on the upper side and the lower side of the circular truncated cone tail wheel; the tail wheel lower gland is annular, and the gland mounting part is sleeved with the tail wheel lower gland; and the tail wheel upper gland is circular and is arranged on the upper sides of the circular truncated cone tail wheel and the tail wheel base shaft in a sealing and covering manner. And the circular truncated cone tail wheel is matched with the rolling bearing and the tail wheel base, so that better rolling performance can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of drum screens, in particular to a drum screen tail wheel device. Background Art

[0002] The drum screen is a conventional sorting equipment. The drum screen is installed at an angle and supported by four supporting wheels. The drum screen drives the supporting wheels to rotate through the driving motor. The friction between the supporting wheels and the drum drives the drum to rotate along the axis of the drum. The tail of the drum is supported by the tail wheel device to ensure that the drum does not move in a row. The material enters the rotating drum, and the material that is smaller than the target sieve hole falls out of the sieve body, and the material that is larger than the target sieve hole is output from the tail of the drum as the drum rotates.

[0003] After the existing roller is installed in place, it forms an inclination angle of about 4° with the ground. The tail wheel support is set at the tail of the roller. The existing tail wheel is usually a vertical shaft welded to the frame, on which a rolling bearing is set, and a cylinder is set outside the rolling bearing to roll with the tail of the roller. Due to the small contact area between the roller and the outer wall of the cylinder, the roller still has a slight up and down jump during operation, which makes the tail wheel wear more and easily damaged. Moreover, the rolling bearing cannot be refueled after long-term use, which also leads to a short service life. In addition, the integrated structure makes it impossible to fine-tune the tail wheel. Utility Model Content

[0004] The utility model aims to provide a drum screen tail wheel device, which has the advantages of wear resistance and long service life.

[0005] In order to achieve the above purpose, the solution of the utility model is:

[0006] A drum screen tail wheel device comprises a tail wheel base, a round table tail wheel, a rolling bearing, an upper tail wheel pressure cover and a lower tail wheel pressure cover;

[0007] The tail wheel base includes an upright tail wheel base shaft;

[0008] The upper part of the tail wheel base shaft is a mounting boss, which includes a bearing mounting part and a gland mounting part arranged up and down;

[0009] The rolling bearing is sleeved on the bearing mounting portion, the interior of the truncated tail wheel is hollow and both ends are connected, and it is sleeved on the outside of the rolling bearing and sleeved with the outer ring of the bearing;

[0010] The outer side wall of the frustum tail wheel is the frustum side surface;

[0011] The upper and lower sides of the truncated platform tail wheel are respectively locked with the tail wheel upper pressure cover and the tail wheel lower pressure cover; the tail wheel lower pressure cover is annular, and the tail wheel lower pressure cover is sleeved on the pressure cover mounting part; the tail wheel upper pressure cover is circular, and the tail wheel upper pressure cover sealing cover is arranged on the upper side of the truncated platform tail wheel and the tail wheel base shaft.

[0012] Further, the outer diameter of the gland mounting portion is smaller than the outer diameter of the tail wheel base shaft, and a first stepped surface is formed between the gland mounting portion and the lower part of the tail wheel base shaft; the outer diameter of the bearing mounting portion is smaller than the outer diameter of the gland mounting portion, and a second stepped surface is formed between the bearing mounting portion and the gland mounting portion; the inner ring of the rolling bearing abuts downward and is limited by the second stepped surface, and the upper part of the rolling bearing is limited by a shaft snap ring; the lower gland of the tail wheel is located above the first stepped surface.

[0013] Further, there are two rolling bearings, which are distributed vertically; there are two inner tail wheel spacers and outer tail wheel spacers respectively corresponding to the inner ring and the outer ring of the bearing between the two rolling bearings. Both the inner tail wheel spacer and the outer tail wheel spacer are annular parts, and the two are nested inside and outside; the shaft snap ring is clamped in the annular groove above the bearing mounting portion to limit the two rolling bearings.

[0014] Further, the frustum-shaped tail wheel is made of 45# steel, and the outer side wall surface of the frustum-shaped tail wheel is heat-treated to HRC42 - 47.

[0015] Further, the lower gland of the tail wheel is provided with a number of through connection holes up and down, and the lower side surface of the frustum-shaped tail wheel is provided with a number of locking holes. The lower gland of the tail wheel is locked and fixed to the lower side surface of the frustum-shaped tail wheel by screws; the upper gland of the tail wheel is also provided with a number of through connection holes up and down, and the upper side surface of the frustum-shaped tail wheel is also provided with a number of locking holes. The upper gland of the tail wheel is locked and fixed to the upper side surface of the frustum-shaped tail wheel by screws.

[0016] Further, the bottom surface of the upper gland of the tail wheel and the top surface of the lower gland of the tail wheel respectively protrude towards the hollow interior of the frustum-shaped tail wheel with positioning flanges, and the positioning flanges are clamped and fitted to the inner wall of the hollow interior of the frustum-shaped tail wheel.

[0017] Further, an oil injection channel is provided inside the tail wheel base shaft. The oil injection channel communicates with the oil injection holes on the top surface of the tail wheel base shaft and the side surface of the lower part of the tail wheel base shaft. A joint type oil cup is provided at the oil injection hole; the inner ring side wall of the annular lower gland of the tail wheel is provided with an annular groove, and a felt sealing ring is installed in the annular groove. At the same time, the felt sealing ring is sleeved on the outer wall of the gland mounting portion in a sealing manner.

[0018] Further, the tail wheel base further includes a tail wheel base plate and a tail wheel base rib plate. The tail wheel base shaft stands upright on one side of the top surface of the tail wheel base plate. The tail wheel base rib plate is in a right triangle shape, and the two right sides of the tail wheel base rib plate are respectively connected to the top surface of the tail wheel base plate and the side surface of the tail wheel base shaft.

[0019] Further, a number of mounting long holes are respectively provided on both sides of the tail wheel base shaft and the tail wheel base rib plate on the tail wheel base plate; each mounting long hole is tightly fitted with the machine frame through a number of fasteners.

[0020] Further, it further includes two tail wheel tightening devices respectively arranged on both sides of the tail wheel base plate; the tail wheel tightening device includes a first tail wheel tightening plate, a second tail wheel tightening plate, a tail wheel tightening screw and a tail wheel tightening nut. The first tail wheel tightening plate is far away from the roller and fixed on the frame. The second tail wheel tightening plate is fixedly connected to the tail wheel base plate. The tail end of the tail wheel tightening screw sequentially passes through the first tail wheel tightening plate and the tail wheel tightening nut, and at the same time, the tail wheel tightening screw is in threaded cooperation with the tail wheel tightening nut. The tail wheel tightening nut is rotatably arranged and limited on the second tail wheel tightening plate, and the head of the tail wheel tightening screw is limited on the side of the first tail wheel tightening plate far away from the second tail wheel tightening plate.

[0021] After adopting the above technical solution, the utility model adopts a frustum-shaped tail wheel in cooperation with a rolling bearing and a tail wheel base, which can have better rolling performance; setting the frustum-shaped tail wheel can increase the contact area between the frustum-shaped tail wheel and the roller, prevent line contact, improve the wear resistance of the frustum-shaped tail wheel, and extend the service life. This tail wheel device is used on a drum sieve equipment. After long-term use, it has good comprehensive performance, simple structure and convenient maintenance. Brief Description of the Drawings

[0022] Figure 1 is a three-dimensional view of an embodiment of the utility model;

[0023] Figure 2 is a front view of an embodiment of the utility model;

[0024] Figure 3 is a top view of an embodiment of the utility model;

[0025] Figure 4 is Figure 2 a sectional view taken along line A-A of

[0026] Figure 5 is an exploded view of an embodiment of the utility model;

[0027] Figure 6 is a schematic diagram of the utility model applied to a drum sieve;

[0028] Figure 7 is Figure 6 an enlarged view of part A of

[0029] Label description: tail wheel device 10, tail wheel base 1, tail wheel base plate 11, mounting long hole 111, tail wheel base shaft 12, mounting convex column 121, bearing mounting part 1211, gland mounting part 1212, first step surface 1213, second step surface 1214, annular groove 1215, oil injection channel 122, oil injection hole 123, joint type oil injection cup 124, tail wheel base rib plate 13, conical tail wheel 2, rolling bearing 3, bearing inner ring 31, bearing outer ring 32, upper tail wheel gland 4, lower tail wheel gland 5, annular groove 51, felt sealing ring 52, connection hole a1, locking hole a2, screw a3, positioning flange a4, shaft circlip 6, fastener 7, hexagon bolt 71, flat washer 72, elastic washer 73, hexagon nut 74, tail wheel tightening device 8, first tail wheel tightening plate 81, second tail wheel tightening plate 82, tail wheel tightening screw 83, tail wheel tightening nut 84, inner tail wheel spacer 91, outer tail wheel spacer 92, roller 20, frame 30. Detailed implementation mode

[0030] To make the objectives, technical solutions and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some but not all of the embodiments of this application. Usually, the components of the embodiments of this application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0031] As Figures 1 to 5 shown, a drum screen tail wheel device 10 of the present utility model includes a tail wheel base 1, a conical tail wheel 2, a rolling bearing 3, an upper tail wheel gland 4, a lower tail wheel gland 5, a shaft circlip 6, a fastener 7 and a tail wheel tightening device 8.

[0032] Refer to Figure 5 , the tail wheel base 1 includes a tail wheel base plate 11, a tail wheel base shaft 12 and a tail wheel base rib plate 13. The tail wheel base shaft 12 stands vertically on one side of the top surface of the tail wheel base plate 11. The tail wheel base rib plate 13 is in the shape of a right triangle, and the two right sides of the tail wheel base rib plate 13 are respectively connected to the top surface of the tail wheel base plate 11 and the side surface of the tail wheel base shaft 12 to strengthen the structural strength of the tail wheel base shaft 12.

[0033] The upper part of the tail wheel base shaft 12 is a mounting convex column 121 for mounting the rolling bearing 3 and the conical tail wheel 2; the mounting convex column 121 includes a bearing mounting part 1211 and a gland mounting part 1212 arranged up and down; the outer diameter of the gland mounting part 1212 is smaller than the outer diameter of the tail wheel base shaft 12, and a first step surface 1213 is formed between the gland mounting part 1212 and the lower part of the tail wheel base shaft 12; the outer diameter of the bearing mounting part 1211 is smaller than the outer diameter of the gland mounting part 1212, and a second step surface 1214 is formed between the bearing mounting part 1211 and the gland mounting part 1212.

[0034] Refer to Figure 4 Figure 4 , three sets of rolling bearings 3 are sleeved on the bearing mounting portion 1211, and the inner ring 31 of the bearing can be downwardly abutted and limited on the second step surface 1214. The upper part of the rolling bearing 3 can be limited by the shaft snap ring 6. In this embodiment, two rolling bearings 3 are arranged vertically to enhance the rolling effect. And there are two tail wheel inner spacers 91 and tail wheel outer spacers 92 respectively located opposite to the inner ring 31 and the outer ring 32 of the bearing between the two rolling bearings 3. The tail wheel inner spacer 91 and the tail wheel outer spacer 92 are both annular parts, and the two are nested inside and outside for separating the two rolling bearings 3. The shaft snap ring 6 can be clamped in the annular groove 1215 above the bearing mounting portion 1211 to limit the two rolling bearings 3.

[0035] The frustum tail wheel 2 is hollow inside and through at both ends, and can be sleeved outside the rolling bearing 3 and socketed with the outer ring 32 of the bearing, so that the frustum tail wheel 2 can smoothly rotate around the tail wheel base shaft 12; the outer side wall of the frustum tail wheel 2 is a frustum side surface to roll horizontally in cooperation with the tail of the roller 20 (Refer to Figure 6 and Figure 7 ). And it can increase the contact area between the frustum tail wheel 2 and the roller 20, prevent line contact, improve the wear resistance of the frustum tail wheel 2, and extend the service life.

[0036] The frustum tail wheel 2 can be made of 45# steel, and the outer side wall surface of the frustum tail wheel 2 is heat-treated to HRC42 - 47 to enhance wear resistance and fatigue resistance..

[0037] The upper and lower sides of the frustum tail wheel 2 are respectively locked with the tail wheel upper gland 4 and the tail wheel lower gland 5 to limit and fix the frustum tail wheel 2, and at the same time, it can protect and block the rolling bearing 3.

[0038] The tail wheel lower gland 5 is annular, the tail wheel lower gland 5 is sleeved on the gland mounting portion 1212 and is located above the first step surface 1213, and can be supported by the first step surface 1213. There can be several through connection holes a1 on the tail wheel lower gland 5, and several locking holes a2 can be provided on the lower side surface of the frustum tail wheel 2. The tail wheel lower gland 5 and the lower side surface of the frustum tail wheel 2 can be locked and fixed by screws a3.

[0039] The tail wheel upper gland 4 is circular, the tail wheel upper gland 4 is hermetically covered on the upper sides of the frustum tail wheel 2 and the tail wheel base shaft 12. There are also several through connection holes a1 on the tail wheel upper gland 4, and several locking holes a2 can also be provided on the upper side surface of the frustum tail wheel 2. The tail wheel upper gland 4 and the upper side surface of the frustum tail wheel 2 can be locked and fixed by screws a3, thereby realizing the installation and assembly of the frustum tail wheel 2.

[0040] The bottom surface of the upper gland 4 of the tail wheel and the top surface of the lower gland 5 of the tail wheel may respectively protrude towards the hollow interior of the conical tail wheel 2 with positioning flanges a4. The positioning flanges a4 can be clamped and fitted to the inner wall of the hollow interior of the conical tail wheel 2 to facilitate the locking and installation of the upper gland 4 and the lower gland 5 of the tail wheel.

[0041] To facilitate the refueling and maintenance of the rolling bearing 3, an oil injection channel 122 may be provided inside the tail wheel base shaft 12. The oil injection channel 122 communicates with the oil injection holes 123 on the top surface of the tail wheel base shaft 12 and the lower side of the tail wheel base shaft 12. A joint type oil filling cup 124 may be provided at the oil injection hole 123. Thus, through the joint type oil filling cup 124, grease can be regularly added to the rolling bearing 3 to extend the life of the rolling bearing 3. The grease can flow out from the top of the tail wheel base shaft 12 along the oil injection channel 122 and then flow into the rolling bearing 3 sleeved on the upper part of the tail wheel base shaft 12. The joint type oil filling cup 124 is arranged on the lower side of the tail wheel base shaft 12, which can facilitate the oil injection operation.

[0042] Since the upper gland 4 of the tail wheel is circular, it can cover and seal the upper side of the conical tail wheel 2 and the tail wheel base shaft 12. Therefore, an annular groove 51 can be provided on the inner side wall of the inner ring of the annular lower gland 5 of the tail wheel. A felt sealing ring 52 is installed in the annular groove 51, so that the felt sealing ring 52 is simultaneously sleeved and sealed on the outer wall of the gland installation part 1212 to achieve the sealing of the lower side of the upper part of the tail wheel base shaft 12 and prevent the grease from leaking downward.

[0043] As Figure 1 、 Figure 5 and Figure 7 As shown, the fastener 7 includes a hexagon bolt 71, a flat washer 72, a spring washer 73 and a hexagon nut 74. A number of installation long holes 111 may be provided on both sides of the tail wheel base shaft 12 and the tail wheel base rib plate 13 on the tail wheel base plate 11. The hexagon bolt 71 passes through the spring washer 73, the flat washer 72, the installation long hole 111 and the installation hole of the frame 30 (not shown in the figure) from top to bottom and is thread-locked with the hexagon nut 74 to firmly install the tail wheel device 10 at the corresponding position of the frame 30.

[0044] Refer to Figure 5, there may be two of the tail wheel tightening devices 8, which are respectively arranged on both sides of the tail wheel base plate 11. The tail wheel tightening device 8 includes a first tail wheel tightening plate 81, a second tail wheel tightening plate 82, a tail wheel tightening screw 83 and a tail wheel tightening nut 84. The first tail wheel tightening plate 81 is away from the roller 20 and fixed on the frame 30. The second tail wheel tightening plate 82 can be fixedly connected to the tail wheel base plate 11. The tail end of the tail wheel tightening screw 83 sequentially passes through the first tail wheel tightening plate 81 and the tail wheel tightening nut 84, and at the same time, the tail wheel tightening screw 83 is in threaded cooperation with the tail wheel tightening nut 84. The tail wheel tightening nut 84 is rotatably inserted and limited on the second tail wheel tightening plate 82, and the head of the tail wheel tightening screw 83 is limited on the side of the first tail wheel tightening plate 81 away from the second tail wheel tightening plate 82.

[0045] Thus, by rotating the tail wheel tightening nut 84, the sliding of the second tail wheel tightening plate 82 on the tail wheel tightening screw 83 can be controlled, thereby driving the position adjustment of the tail wheel base plate 11. This position adjustment can be achieved by the movement of the fastener 7 in the installation long hole 111. Thus, the overall position of the tail wheel device 10 can be finely adjusted by using two tail wheel tightening devices 8, accurately positioned, and ensuring that the conical tail wheel 2 is in close contact with the rear end edge of the roller 20.

[0046] In summary, the utility model adopts the cooperation of the conical tail wheel 2, the rolling bearing 3 and the tail wheel base 1, which can have better rolling performance. The setting of the conical tail wheel 2 can increase the contact area between the conical tail wheel 2 and the roller 20, prevent line contact, improve the wear resistance of the conical tail wheel 2, and increase the service life. The setting of the oil injection channel 122 and the joint type oil injection cup 124 can regularly inject oil for maintenance of the rolling bearing 3, extend the life of the rolling bearing 3, and thus ensure the service life of the tail wheel device 10. Further, the tail wheel tightening device 8 is provided to realize the overall position fine adjustment of the tail wheel device 10 and ensure the stable operation of the roller 20.

[0047] This tail wheel device 10 is used on the roller 20 sieve equipment. After long-term use, it has good comprehensive performance, simple structure and convenient maintenance.

[0048] The above are only the preferred embodiments of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions within the idea of the utility model belong to the protection scope of the utility model. It should be noted that for those of ordinary skill in the art in this technical field, equivalent changes and modifications without departing from the principle of the utility model should still belong to the protection scope of the utility model.

[0049] In the description of the embodiments of the present application, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is 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 operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0050] In the description of the present application, the meanings of "a plurality of" and "several" are two or more, unless otherwise specifically defined.

[0051] In the description of the embodiments of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0052] In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

Claims

1. A drum sieve tail wheel device, characterized in that: it includes a tail wheel base, a frustum-shaped tail wheel, a rolling bearing, an upper tail wheel gland and a lower tail wheel gland; the tail wheel base includes a vertically erected tail wheel base shaft; the upper part of the tail wheel base shaft is an installation convex column, and the installation convex column includes a bearing installation part and a gland installation part arranged up and down; the rolling bearing is sleeved on the bearing installation part, the frustum-shaped tail wheel is hollow inside and through at both ends, and is sleeved outside the rolling bearing and socketed with the outer ring of the bearing; the outer side wall of the frustum-shaped tail wheel is a frustum side surface; the upper and lower sides of the frustum-shaped tail wheel are respectively locked with the upper tail wheel gland and the lower tail wheel gland; the lower tail wheel gland is annular, and the lower tail wheel gland is sleeved on the gland installation part; the upper tail wheel gland is circular, and the upper tail wheel gland is hermetically covered on the upper sides of the frustum-shaped tail wheel and the tail wheel base shaft.

2. The drum sieve tail wheel device according to claim 1, characterized in that: the outer diameter of the gland installation part is smaller than the outer diameter of the tail wheel base shaft, and a first step surface is formed between the gland installation part and the lower part of the tail wheel base shaft; the outer diameter of the bearing installation part is smaller than the outer diameter of the gland installation part, and a second step surface is formed between the bearing installation part and the gland installation part; the inner ring of the rolling bearing abuts downward and is limited to the second step surface, and the upper part of the rolling bearing is limited by a shaft circlip; the lower tail wheel gland is located above the first step surface.

3. The drum sieve tail wheel device according to claim 2, characterized in that: there are two rolling bearings, and they are distributed up and down; there are two tail wheel inner spacers and tail wheel outer spacers respectively corresponding to the inner ring and the outer ring of the bearing spaced between the two rolling bearings. The tail wheel inner spacer and the tail wheel outer spacer are both annular parts, and the two are nested inside and outside; the shaft circlip is clamped in the annular groove above the bearing installation part to limit the two rolling bearings.

4. The drum sieve tail wheel device according to claim 1, characterized in that: the frustum-shaped tail wheel is made of 45# steel, and the surface of the outer side wall of the frustum-shaped tail wheel is heat-treated to HRC42 - 47.

5. The drum sieve tail wheel device according to claim 1, characterized in that: the lower tail wheel gland is provided with a number of through connection holes up and down, and the lower side surface of the frustum-shaped tail wheel is provided with a number of locking holes, and the lower tail wheel gland and the lower side surface of the frustum-shaped tail wheel are locked and fixed by screws; the upper tail wheel gland is also provided with a number of through connection holes up and down, and the upper side surface of the frustum-shaped tail wheel is also provided with a number of locking holes, and the upper tail wheel gland and the upper side surface of the frustum-shaped tail wheel are locked and fixed by screws.

6. The drum sieve tail wheel device according to claim 1, characterized in that: the bottom surface of the upper tail wheel gland and the top surface of the lower tail wheel gland respectively protrude into the hollow interior of the frustum-shaped tail wheel with positioning flanges, and the positioning flanges are clamped and fitted to the inner wall of the hollow interior of the frustum-shaped tail wheel.

7. The drum sieve tail wheel device according to claim 1, characterized in that: An oil injection channel is provided inside the tail wheel base shaft. The oil injection channel communicates with an oil injection hole on the top surface of the tail wheel base shaft and the lower side surface of the tail wheel base shaft. A joint type oil injection cup is arranged at the oil injection hole; an annular groove is provided on the inner side wall of the inner ring of the annular tail wheel pressing cover. A felt sealing ring is installed in the annular groove. At the same time, the felt sealing ring is sleeved on the outer wall of the pressing cover installation part in a sealing manner.

8. A drum screen tail wheel device according to claim 1, wherein: The tail wheel base further includes a tail wheel base plate and a tail wheel base rib plate. The tail wheel base shaft stands vertically on one side of the top surface of the tail wheel base plate. The tail wheel base rib plate is in the shape of a right triangle, and the two right sides of the tail wheel base rib plate are respectively connected to the top surface of the tail wheel base plate and the side surface of the tail wheel base shaft.

9. A drum screen tail wheel device according to claim 8, wherein: A number of mounting long holes are respectively provided on both sides of the tail wheel base shaft and the tail wheel base rib plate on the tail wheel base plate; each mounting long hole is tightly fitted with the frame through a number of fasteners.

10. A drum screen tail wheel device according to claim 9, wherein: It further includes two tail wheel tightening devices respectively arranged on both sides of the tail wheel base plate; the tail wheel tightening device includes a first tail wheel tightening plate, a second tail wheel tightening plate, a tail wheel tightening screw and a tail wheel tightening nut. The first tail wheel tightening plate is far away from the drum and fixed on the frame. The second tail wheel tightening plate is fixedly connected to the tail wheel base plate. The tail end of the tail wheel tightening screw sequentially passes through the first tail wheel tightening plate and the tail wheel tightening nut. At the same time, the tail wheel tightening screw is in threaded cooperation with the tail wheel tightening nut; the tail wheel tightening nut is rotatably inserted and limited on the second tail wheel tightening plate, and the head of the tail wheel tightening screw is limited on the side of the first tail wheel tightening plate far away from the second tail wheel tightening plate.

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