A screening mechanism for sand used in bridge construction

Abstract

The present invention relates to the technical field of screening equipment, and specifically to a screening mechanism for bridge construction sand, comprising a base, a screening box is arranged above the base, a sliding member is arranged at the bottom of the screening box, a horizontal shaking mechanism matched with the screening box is arranged on the base, a supporting frame is fixedly connected to the base, a driving roller and a driven roller are arranged on the supporting frame, the driving roller and the driven roller are connected through a conveyor belt, a plurality of collecting plates are arranged on the conveyor belt, the collecting plate and the conveyor belt are connected through a rotator, a baffle is fixedly connected to the collecting plate, the baffle and the conveyor belt are connected through a first tension spring, a receiving hopper is fixedly connected to the screening box, a baffle bar is arranged above the receiving hopper, and the baffle bar and the receiving hopper are connected through a first connecting column; the sand that has not been screened can be screened again through the screening net to ensure that the sand is fully screened, while reducing the time that the sand that has not been screened stays on the screening net, thereby improving the screening efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of screening equipment, in particular to a screening mechanism for sand used in bridge construction. Background Art

[0002] Sand is an important building material in bridge construction. The size of sand used in different places is also different. Therefore, the size of sand needs to be classified. The current sand screening work relies on manual work, which has the disadvantage of high labor intensity. In the prior art, a Chinese patent with publication number CN211436931U discloses a rapid sand screening equipment for bridge construction. The date of publication is September 8, 2020. By designing the screening frame to be at an angle of degrees to the horizontal plane, the speed of the coarse sand inside the screening frame flowing out of the discharge port is effectively accelerated, avoiding the phenomenon of sand residue inside the screening frame. In the process of sand screening, the sand that cannot be screened will hinder other sand from passing through the screening frame, increasing the screening time and affecting the screening efficiency. Summary of the invention

[0003] In view of this, the purpose of the present invention is to propose a screening mechanism for bridge construction sand to solve the above-mentioned problem that during the sand screening process, the sand that cannot be screened will hinder other sand from passing through the screening frame, increase the screening time, and affect the screening efficiency.

[0004] Based on the above purpose, the present invention provides a screening mechanism for bridge construction sand, including a base, a screening box is arranged above the base, a sliding member is arranged at the bottom of the screening box, a horizontal shaking mechanism matched with the screening box is arranged on the base, a support frame is fixedly connected to the base, a driving roller and a driven roller are arranged on the support frame, the driving roller and the driven roller are connected by a conveyor belt, a plurality of collecting plates are arranged on the conveyor belt, the collecting plates and the conveyor belt are connected by a rotator, a baffle is fixedly connected to the collecting plates, the baffle and the conveyor belt are connected by a first tension spring, and a support frame is fixedly connected to the base, a driving roller and a driven roller are arranged on the support frame, the driving roller and the driven roller are connected by a conveyor belt, a plurality of collecting plates are arranged on the conveyor belt, the collecting plates are connected by a rotator, a baffle is fixedly connected to the collecting plates, the baffle and the conveyor belt are connected by a first tension spring, and a baffle is fixedly connected to the screening box. A material receiving hopper is connected, a baffle is provided above the material receiving hopper, the baffle and the material receiving hopper are connected by a first connecting column, a first discharge port and a second discharge port are respectively provided on an inner wall on one side of the screening box, a third discharge port is provided on an inner wall on the other side of the screening box, a first material guide plate and a second material guide plate are fixedly connected in the base, a screening mesh is provided between the first material guide plate and the second material guide plate, both sides of the screening mesh are fixedly connected to the inner wall of the screening box, the first material guide plate, the second material guide plate and the screening mesh are all inclined, a material guide block is provided on the screening box, and the material guide block and the screening box are connected by a telescopic mechanism.

[0005] Optionally, a first material guide trough and a second material guide trough are fixedly connected to one side of the screening box, the first material guide trough cooperates with the first discharge port, the second material guide trough cooperates with the second discharge port, and a third material guide trough is fixedly connected to the other side of the screening box, the third material guide trough cooperates with the third discharge port.

[0006] Optionally, the horizontal shaking mechanism includes a side panel arranged on one side of the screening box, the side panel and the screening box are connected by an elastic compression unit, the side panel and the base are fixedly connected, a cam is provided on the side of the screening box away from the side panel, a motor is fixedly connected to the top of the base, and the output end of the motor is fixedly connected to the cam.

[0007] Optionally, the elastic compression unit includes two telescopic rods arranged between the side plate and the screening box, the two ends of the telescopic rods are respectively fixedly connected to the screening box and the side plate, and the outer sleeve of the telescopic rods is provided with a compression spring, and the two ends of the compression spring are respectively fixedly connected to the side plate and the screening box.

[0008] Optionally, the sliding member includes a plurality of rollers disposed below the screening box, the rollers and the screening box are connected via a connecting block, and the rollers are in contact with the top of the base.

[0009] Optionally, the rotator includes support plates symmetrically arranged on both sides of the collecting plate, the support plates and the conveyor belt are fixedly connected, and the collecting plate and the support plates are rotatably connected via a rotating shaft.

[0010] Optionally, the telescopic mechanism includes two prisms arranged on one side of the screening box, the prisms and the guide block are connected by a second connecting column, one end of the guide block is located in the first discharge port, and the cross-section of the guide block is a right-angled trapezoidal structure, and two limit columns are fixedly connected to one side of the screening box, and the two limit columns respectively pass through the two prisms, and a positioning unit cooperating with the prism is provided on the screening box.

[0011] Optionally, the positioning unit includes a connecting plate arranged on one side of the screening box, with first fixed plates fixedly connected to both sides of the connecting plate, a slot is provided on the prism, two plug blocks are fixedly connected to the bottom of the first fixed plate, the plug blocks and the slots cooperate with each other, a second fixed plate is provided below the connecting plate, the second fixed plate is fixedly connected to the screening box, two fixed columns are fixedly connected to the second fixed plate, the fixed columns pass through the connecting plate, a second tension spring is provided on the outside of the fixed columns, and both ends of the second tension spring are fixedly connected to the connecting plate and the second fixed plate, respectively.

[0012] The beneficial effects of the present invention are as follows: sand is poured into the screening box, the sand is guided by the first guide plate, and then the sand flows onto the screening net, the screened sand flows onto the second guide plate, and finally the screened sand is discharged through the second discharge port, and the unscreened sand is discharged through the third discharge port, and the sand falls on the collecting plate. The baffle design prevents the sand from slipping off the collecting plate, and the driving roller is externally connected to a driver so that the driving roller drives the conveyor belt to move. When the collecting plate contacts the baffle bar, the baffle bar limits the position of the collecting plate, causing the collecting plate to tilt, and the first tension spring is in a tensioned state, thereby causing the sand on the collecting plate to slide onto the receiving hopper. When the collecting plate is no longer in contact with the baffle bar When the sand that has not been screened is needed to be collected, the guide block is driven to move by the telescopic mechanism, so that the guide block contacts the first guide plate, the first discharge port is opened, and the sand on the first guide plate slides onto the guide block, and finally the large particles of sand that have not been screened are discharged through the first discharge port. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0015] Figure 2 For the present invention Figure 1 A schematic diagram of the enlarged structure of the middle A area;

[0016] Figure 3 This is a schematic diagram of the structure of a screening box according to an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of the structure of an elastic compression unit according to an embodiment of the present invention;

[0018] Figure 5 This is a schematic diagram of the internal structure of the screening box according to an embodiment of the present invention;

[0019] Figure 6 This is a schematic diagram of the telescopic mechanism structure of an embodiment of the present invention;

[0020] Figure 7It is a schematic diagram of the receiving hopper structure of an embodiment of the present invention.

[0021] The markings in the figure are:

[0022] 1. Base; 2. Screening box; 3. Support frame; 4. Driving roller; 5. Driven roller; 6. Conveyor belt; 7. Collecting plate; 8. Baffle; 9. First tension spring; 10. Receiving hopper; 11. Baffle bar; 12. First discharge port; 13. Second discharge port; 14. Third discharge port; 15. First guide plate; 16. Second guide plate; 17. Screening net; 18. Guide block; 19. First guide trough; 20. Second guide trough; 21. Three material guide troughs; 22, side plates; 23, motors; 24, cams; 25, telescopic rods; 26, compression springs; 27, connecting blocks; 28, rollers; 29, support plates; 30, rotating shafts; 31, prisms; 32, first connecting columns; 33, limiting columns; 34, connecting plates; 35, first fixed plates; 36, slots; 37, inserts; 38, second fixed plates; 39, fixed columns; 40, second tension springs; 41, second connecting columns. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0024] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] Embodiment 1:

[0026] One or more embodiments of the present specification provide a screening mechanism for bridge construction sand, such as Figures 1 to 7As shown, it includes a base 1, a screening box 2 is arranged above the base 1, a sliding member is arranged at the bottom of the screening box 2, a horizontal shaking mechanism matched with the screening box 2 is arranged on the base 1, a support frame 3 is fixedly connected to the base 1, a driving roller 4 and a driven roller 5 are arranged on the support frame 3, the driving roller 4 and the driven roller 5 are connected by a conveyor belt 6, a plurality of collecting plates 7 are arranged on the conveyor belt 6, the collecting plates 7 and the conveyor belt 6 are connected by a rotator, a baffle 8 is fixedly connected to the collecting plate 7, the baffle 8 and the conveyor belt 6 are connected by a first tension spring 9, and a A receiving hopper 10 is provided with a baffle 11 above the receiving hopper 10, and the baffle 11 and the receiving hopper 10 are connected by a first connecting column 32. A first discharge port 12 and a second discharge port 13 are respectively provided on the inner wall of one side of the screening box 2, and a third discharge port 14 is provided on the inner wall of the other side of the screening box 2. A first guide plate 15 and a second guide plate 16 are fixedly connected in the base 1, and a screening net 17 is provided between the first guide plate 15 and the second guide plate 16. Both sides of the screening net 17 are fixedly connected to the inner wall of the screening box 2, and the first guide plate 15 and the second guide plate 16 are respectively fixedly connected to the inner wall of the screening box 2. The screen mesh 17 is tilted, a guide block 18 is provided on the screen box 2, and the guide block 18 and the screen box 2 are connected by a telescopic mechanism. Sand is poured into the screen box 2, and the sand is guided by the first guide plate 15, so that the sand flows to the screen mesh 17, and the screened sand flows to the second guide plate 16. Finally, the screened sand is discharged through the second discharge port 13, and the unscreened sand is discharged through the third discharge port 14. The sand falls on the collecting plate 7. The baffle plate 8 is designed to prevent the sand from sliding out of the collecting plate 7. The driving roller 4 is externally connected to a driver so that the driving roller 4 can be driven. The movable roller 4 drives the conveyor belt 6 to move. When the collecting plate 7 contacts the baffle 11, the baffle 11 limits the position of the collecting plate 7, causing the collecting plate 7 to tilt. The first tension spring 9 is in a tensioned state, causing the sand on the collecting plate 7 to slide onto the receiving hopper 10. When the collecting plate 7 is no longer in contact with the baffle 11, the first tension spring 9 resets the position of the collecting plate 7. The unscreened sand can be screened again through the sieve 17, ensuring that the sand is fully screened. At the same time, the time that the unscreened sand stays on the sieve 17 is reduced, thereby improving the screening efficiency.

[0027] In some optional specific embodiments, such as Figure 1 and Figure 5 As shown, a first material guide trough 19 and a second material guide trough 20 are fixedly connected to one side of the screening box 2, the first material guide trough 19 cooperates with the first discharge port 12, the second material guide trough 20 cooperates with the second discharge port 13, and a third material guide trough 21 is fixedly connected to the other side of the screening box 2, the third material guide trough 21 cooperates with the third discharge port 14. Through the design of the first material guide trough 19, the second material guide trough 20 and the third material guide trough 21, sand is guided.

[0028] In some optional specific embodiments, such as Figure 1 , Figure 3 and Figure 4 As shown, the horizontal shaking mechanism includes a side plate 22 arranged on one side of the screening box 2, the side plate 22 and the screening box 2 are connected by an elastic compression unit, the side plate 22 and the base 1 are fixedly connected, a cam 24 is provided on the side of the screening box 2 away from the side plate 22, a motor 23 is fixedly connected to the top of the base 1, the output end of the motor 23 is fixedly connected to the cam 24, the elastic compression unit includes two telescopic rods 25 arranged between the side plate 22 and the screening box 2, and the two ends of the telescopic rod 25 are respectively fixed to the screening box 2 and the side plate 22. The telescopic rod 25 is fixedly connected, and a compression spring 26 is provided on the outside of the telescopic rod 25. The two ends of the compression spring 26 are fixedly connected to the side plate 22 and the screening box 2 respectively. Through the design of the side plate 22, the telescopic rod 25 and the compression spring 26, the screening box 2 is elastically connected to the base 1. The motor 23 drives the cam 24 to rotate, and the cam 24 can hit the screening box 2, so that the screening box 2 can shake in the horizontal direction to prevent sand from accumulating on the receiving hopper 10, the first guide plate 15, the second guide plate 16 and the screening mesh 17.

[0029] In some optional specific embodiments, such as Figure 1 and Figure 3 As shown, the sliding member includes a plurality of rollers 28 arranged below the screening box 2. The rollers 28 and the screening box 2 are connected via a connecting block 27. The rollers 28 are in contact with the top of the base 1. Through the design of the connecting block 27 and the rollers 28, the screening box 2 is supported to reduce the resistance encountered by the screening box 2 when it moves.

[0030] In some optional specific embodiments, such as Figure 1 and Figure 2 As shown, the rotator includes support plates 29 symmetrically arranged on both sides of the collecting plate 7, the support plates 29 are fixedly connected to the conveyor belt 6, and the collecting plate 7 and the support plate 29 are rotatably connected via a rotating shaft 30. Through the design of the support plates 29 and the rotating shaft 30, the collecting plate 7 is rotatably connected relative to the conveyor belt 6.

[0031] Embodiment 2:

[0032] One or more embodiments of the present specification provide a screening mechanism for bridge construction sand, such as Figure 1 and Figure 6As shown, it includes a telescopic mechanism, which includes two prisms 31 arranged on one side of the screening box 2, the prism 31 and the guide block 18 are connected by a second connecting column 41, one end of the guide block 18 is located in the first discharge port 12, and the cross-section of the guide block 18 is a right-angled trapezoidal structure, one side of the screening box 2 is fixedly connected to two limiting columns 33, the two limiting columns 33 respectively penetrate the two prisms 31, the screening box 2 is provided with a positioning unit matched with the prism 31, the positioning unit includes a connecting plate 34 arranged on one side of the screening box 2, the two sides of the connecting plate 34 are respectively fixedly connected to the first fixing plate 35, a slot 36 is opened on the prism 31, the bottom of the first fixing plate 35 is fixedly connected to two plug blocks 37, the plug blocks 37 and the slots 36 cooperate, a second fixing plate 38 is provided below the connecting plate 34, the second fixing plate 38 is fixedly connected to the screening box 2, and the second fixing plate 38 is on There are two fixed columns 39 fixedly connected, the fixed columns 39 pass through the connecting plate 34, and the outer sleeve of the fixed columns 39 is provided with a second tension spring 40. The two ends of the second tension spring 40 are fixedly connected to the connecting plate 34 and the second fixing plate 38 respectively. The connecting plate 34 is manually driven to move up, so that the first fixing plate 35 drives the plug 37 to disengage from the corresponding slot 36, and the second tension spring 40 is in a stretched state. The prism 31 is manually driven to move, so that the second connecting column 41 drives the guide block 18 to move, and then the guide block 18 and the first guide plate 15 are in contact, and at the same time the slot 36 moves to the bottom of another plug 37, and the connecting plate 34 is released. The second tension spring 40 drives the connecting plate 34 and the first fixing plate 35 to move downward, so that the plug 37 is inserted into the corresponding slot 36, so that the prism 31 can be fixed relative to the screening box 2, and then the guide block 18 can be fixed relative to the screening box 2.

[0033] Working principle: sand is poured into the screening box 2, and the sand is guided by the first guide plate 15, so that the sand flows to the screening net 17, and the screened sand flows to the second guide plate 16, and finally the screened sand is discharged through the second discharge port 13, and the unscreened sand is discharged through the third discharge port 14, and the sand falls on the collecting plate 7. The design of the baffle 8 prevents the sand from slipping out of the collecting plate 7. The driving roller 4 is externally connected to the driver, so that the driving roller 4 drives the conveyor belt 6 to move. When the collecting plate 7 contacts the baffle 11, the baffle 11 limits the position of the collecting plate 7, so that the collecting plate 7 is tilted, and the first The stretch spring 9 is in a stretched state, so that the sand on the collecting plate 7 slides onto the receiving hopper 10, and the sand slides onto the first guide plate 15 through the receiving hopper 10. When the collecting plate 7 is no longer in contact with the baffle 11, the first stretch spring 9 resets the position of the collecting plate 7, and the unscreened sand can be screened again through the sieve 17, ensuring that the sand is fully screened and reducing the time that the unscreened sand stays on the sieve 17, thereby improving the screening efficiency. The design of the side plate 22, the telescopic rod 25 and the compression spring 26 makes the screening box 2 elastically connected to the base 1, and the motor 23 drives the cam to move. The wheel 24 rotates, and the cam 24 can hit the screening box 2, so that the screening box 2 can be shaken in the horizontal direction to prevent sand from accumulating on the receiving hopper 10, the first guide plate 15, the second guide plate 16 and the screening net 17. The screening box 2 is supported by the design of the connecting block 27 and the roller 28 to reduce the resistance encountered by the screening box 2 when it moves. When it is necessary to collect the unscreened sand, the connecting plate 34 is manually driven to move up, so that the first fixing plate 35 drives the plug block 37 to disengage from the corresponding slot 36, the second tension spring 40 is in a tensioned state, and the prism 31 is manually driven to move, so that the second connecting The column 41 drives the guide block 18 to move, so that the guide block 18 and the first guide plate 15 are in contact, and at the same time the slot 36 moves to the bottom of another plug block 37, and the connecting plate 34 is loosened. The second tension spring 40 drives the connecting plate 34 and the first fixed plate 35 to move downward, so that the plug block 37 is inserted into the corresponding slot 36, so that the prism 31 can be fixed relative to the screening box 2, and then the guide block 18 is fixed relative to the screening box 2, and the first discharge port 12 can be opened, and the sand on the first guide plate 15 slides onto the guide block 18, and finally the large particles of sand that have not been screened are discharged through the first discharge port 12.

[0034] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0035] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A screening mechanism for bridge construction sand, comprising a base (1), a screening box (2) being arranged above the base (1), characterized in that: The bottom of the screening box (2) is provided with a sliding member, the base (1) is provided with a horizontal shaking mechanism matched with the screening box (2), the base (1) is fixedly connected with a support frame (3), the support frame (3) is provided with a driving roller (4) and a driven roller (5), the driving roller (4) and the driven roller (5) are connected through a conveyor belt (6), a plurality of collecting plates (7) are provided on the conveyor belt (6), the collecting plates (7) and the conveyor belt (6) are connected through a rotator, a baffle (8) is fixedly connected to the collecting plates (7), the baffle (8) and the conveyor belt (6) are connected through a first tension spring (9), a receiving hopper (10) is fixedly connected to the screening box (2), a baffle bar (11) is provided above the receiving hopper (10), and the baffle bar (11) and the receiving hopper are connected to each other. (10) connected by a first connecting column (32), a first discharge port (12) and a second discharge port (13) are respectively provided on the inner wall of one side of the screening box (2), a third discharge port (14) is provided on the inner wall of the other side of the screening box (2), a first guide plate (15) and a second guide plate (16) are fixedly connected in the base (1), a screening net (17) is provided between the first guide plate (15) and the second guide plate (16), both sides of the screening net (17) are respectively fixedly connected to the inner wall of the screening box (2), the first guide plate (15), the second guide plate (16) and the screening net (17) are all arranged in an inclined manner, a guide block (18) is provided on the screening box (2), and the guide block (18) and the screening box (2) are connected by a telescopic mechanism; The telescopic mechanism comprises two prisms (31) arranged on one side of the screening box (2); the prisms (31) and the guide block (18) are connected via a second connecting column (41); one end of the guide block (18) is located in the first discharge port (12); and the cross section of the guide block (18) is a right-angled trapezoidal structure; two limiting columns (33) are fixedly connected to one side of the screening box (2); the two limiting columns (33) respectively penetrate the two prisms (31); and a positioning unit matching the prisms (31) is provided on the screening box (2); The positioning unit comprises a connecting plate (34) arranged on one side of the screening box (2), the two sides of the connecting plate (34) are respectively fixedly connected with first fixing plates (35), a slot (36) is provided on the prism (31), the bottom of the first fixing plate (35) is fixedly connected with two plug blocks (37), the plug blocks (37) and the slot (36) cooperate with each other, a second fixing plate (38) is provided below the connecting plate (34), the second fixing plate (38) is fixedly connected with the screening box (2), two fixing columns (39) are fixedly connected to the second fixing plate (38), the fixing columns (39) pass through the connecting plate (34), a second tension spring (40) is sleeved on the outside of the fixing column (39), and the two ends of the second tension spring (40) are respectively fixedly connected to the connecting plate (34) and the second fixing plate (38).

2. The screening mechanism for bridge construction sand according to claim 1, characterized in that: A first material guide trough (19) and a second material guide trough (20) are fixedly connected on one side of the screening box (2), the first material guide trough (19) cooperates with the first discharge port (12), the second material guide trough (20) cooperates with the second discharge port (13), and a third material guide trough (21) is fixedly connected on the other side of the screening box (2), the third material guide trough (21) cooperates with the third discharge port (14).

3. The screening mechanism for bridge construction sand according to claim 1, characterized in that: The horizontal shaking mechanism comprises a side plate (22) arranged on one side of the screening box (2), the side plate (22) and the screening box (2) are connected via an elastic compression unit, the side plate (22) and the base (1) are fixedly connected, a cam (24) is provided on the side of the screening box (2) away from the side plate (22), a motor (23) is fixedly connected to the top of the base (1), and the output end of the motor (23) is fixedly connected to the cam (24).

4. The screening mechanism for bridge construction sand according to claim 3, characterized in that: The elastic compression unit comprises two telescopic rods (25) arranged between the side plate (22) and the screening box (2), the two ends of the telescopic rods (25) being fixedly connected to the screening box (2) and the side plate (22) respectively, and a compression spring (26) being sleeved on the outside of the telescopic rods (25), and the two ends of the compression spring (26) being fixedly connected to the side plate (22) and the screening box (2) respectively.

5. The screening mechanism for bridge construction sand according to claim 1, characterized in that: The sliding member comprises a plurality of rollers (28) arranged below the screening box (2); the rollers (28) and the screening box (2) are connected via a connecting block (27); and the rollers (28) are in contact with the top of the base (1).

6. The screening mechanism for bridge construction sand according to claim 1, characterized in that: The rotator comprises support plates (29) symmetrically arranged on both sides of the collecting plate (7); the support plates (29) and the conveyor belt (6) are fixedly connected; and the collecting plate (7) and the support plates (29) are rotatably connected via a rotating shaft (30).

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