Squeezing and dewatering device for paper production

Abstract

The utility model provides a squeezing dehydration device for paper production, which comprises a first squeezing unit and a second squeezing unit which are arranged on a bearing frame, the second squeezing unit is arranged on the upper side of the first squeezing unit, and the first squeezing unit and the second squeezing unit are matched to form a first compaction opening and a second compaction opening. Paper pulp sequentially passes through the first compaction opening and the second compaction opening to complete the squeezing process, a scraping and sweeping unit is further arranged on the side, close to the second compaction opening, of the top of the second squeezing unit, and the scraping and sweeping unit is connected with the bearing frame through an overturning unit. The paper pulp squeezing device is compact in structure, reasonable in design and convenient and fast to operate, and paper pulp squeezing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of paper production tools, in particular to a press dehydration device for paper production. Background Art

[0002] The paper-making industry is an energy-consuming industry, and the production of paper is the most commonly used item in our daily life. Paper runs through many aspects such as life, work, and study. With the progress of society, in the process of paper production, it is also necessary to consider how to protect the environment. While ensuring the production effect, the impact on the environment is reduced. During the pressing process of pulp, its main function is to remove the water adsorbed in the paper with high efficiency, so as to facilitate the subsequent process treatment. In addition, during the pressing of paper, the paper after removing water will adsorb on the pressed felt and needs to be cleaned in time.

[0003] Chinese Patent Document CN 212404622 U records a press dehydration device for papermaking, but the processing capacity of this device is low, and the number of presses is single, so the dehydration effect is limited; Chinese Patent Document CN 208183436 U records a pressing device for papermaking, which cannot clean the felt in time and has defects in use and needs to be improved. Summary of the Utility Model

[0004] The utility model provides a press dehydration device for paper production, which solves the problems of complex structure of the pulp pressing device, poor press dehydration effect, and inconvenient cleaning.

[0005] To solve the above technical problems, the technical solution adopted by the utility model is: a press dehydration device for paper production, including a first extrusion unit and a second extrusion unit arranged on a load-bearing frame. The second extrusion unit is arranged on the upper side of the first extrusion unit. The first extrusion unit and the second extrusion unit cooperate to form a first compaction port and a second compaction port. The pulp completes the pressing process after passing through the first compaction port and the second compaction port in sequence. A scraping unit is also arranged on the top of the second extrusion unit near one side of the second compaction port. The scraping unit is connected to the load-bearing frame through a flipping unit.

[0006] In a preferred solution, the first extrusion unit includes a first round roller, a second round roller, and a third round roller. The first felt is wound around the first round roller, the second round roller, and the third round roller.

[0007] The second extrusion unit includes a fourth round roller and a fifth round roller. The second felt is wound around the fourth round roller and the fifth round roller. The fifth round roller and the second round roller cooperate to form the first compaction port, and the fourth round roller and the first round roller cooperate to form the second compaction port.

[0008] In a preferred embodiment, the load-bearing frame includes a first mounting frame, a second mounting frame, and a third mounting frame that are arranged in parallel. The first mounting frame, the second mounting frame, and the third mounting frame are connected by a fixing plate. The fourth roller and the first roller are rotatably arranged on the first mounting frame, the fifth roller and the second roller are rotatably arranged on the second mounting frame, and the third roller is rotatably arranged on the third mounting frame.

[0009] In a preferred embodiment, a top plate is provided on the top of the first mounting frame. A first driving unit is provided on the top plate. The first driving unit is used to drive the fourth roller to rotate. A second driving unit is provided on one side of the first mounting frame. The second driving unit is used to drive the first roller to rotate. The rotating directions of the first roller and the fourth roller are opposite.

[0010] In a preferred embodiment, the first driving unit includes a first motor. A first fixing sleeve is provided at the end of the first motor. The first fixing sleeve is connected to a second fixing sleeve through a first belt. The second fixing sleeve is sleeved on the end of the fourth roller.

[0011] The second driving unit includes a second motor. A third fixing sleeve is provided at the end of the second motor. The third fixing sleeve is connected to a fourth fixing sleeve through a second belt. The fourth fixing sleeve is sleeved on the end of the first roller.

[0012] In a preferred embodiment, straight extension plates are provided on the outer sides of the upper parts of the first mounting frame and the second mounting frame. A third waist-shaped round hole is provided through the upper side of the straight extension plate. The shaft rods of the fourth roller and the fifth roller are inserted into the third waist-shaped round hole. The straight extension plate is connected to an adjustment unit through screws. The adjustment unit supports the shaft rods of the fourth roller and the fifth roller.

[0013] In a preferred embodiment, the adjustment unit includes a first cylinder body and a first ejector rod. The top of the first ejector rod is connected to a second clamping block through a first clamping block and screws. A first arc-shaped opening and a second arc-shaped opening are respectively provided on the first clamping block and the second clamping block. The first arc-shaped opening and the second arc-shaped opening are attached to the shaft rods of the fourth roller and the fifth roller.

[0014] In a preferred embodiment, a tightening unit for adjusting the tightness of the second belt is further provided on the fixing plate. The tightening unit includes a third motor and an L-shaped plate. The third motor is connected to the L-shaped plate through a screw rod. A fifth fixing sleeve is rotatably provided on the L-shaped plate. The second belt is wound around the fifth fixing sleeve.

[0015] A first threaded hole is provided through the L-shaped plate. The screw rod is inserted into the first threaded hole. Two clamping plates are provided in parallel at the bottom of the L-shaped plate. A second threaded hole is provided through the clamping plate. The second threaded hole is connected to a limiting plate through screws.

[0016] In a preferred embodiment, the scraping unit includes a scraper and a movable plate. The scraper is connected to the movable plate by screws. A plurality of third threaded holes are provided through the scraper in parallel, and a plurality of second oblong holes are provided through the movable plate in parallel. The screws are inserted into the second oblong holes and the third threaded holes. A chamfer is provided at the end of the movable plate, and the chamfer abuts against the second felt.

[0017] In a preferred embodiment, a plurality of bosses are provided on the top plate in parallel. A notch is provided in the middle of the boss, and a first through hole is provided through the notch. A plurality of lifting lugs are provided on one side of the scraper in parallel. The second pin is inserted into the lifting lug and the first through hole.

[0018] The flipping unit includes a second cylinder body and a second ejector rod. An arc head is provided at the end of the second ejector rod. The second cylinder body is fixed to the top plate through a support frame. A driving plate is provided in the middle of the scraper. Two baffles are provided in parallel on the inner side of the driving plate. There is a gap between the two baffles. A first oblong hole is provided through the baffle. The first pin is inserted into the arc head and the first oblong hole.

[0019] The beneficial effects of the present invention are as follows: By respectively providing a first extrusion unit and a second extrusion unit on the load-bearing frame, they can cooperate with each other at multiple positions to complete the pressing of the pulp, ensuring better dehydration effect. At the same time, the provided cleaning unit can change its own size as needed, making the adjustment more convenient. The first driving unit and the position adjustment unit cooperate to adjust the distance between the second extrusion unit and the first extrusion unit, thereby changing the opening sizes of the first compaction port (primary feeding pressing) and the second compaction port (secondary discharging pressing), ensuring good use effect. At the same time, the position adjustment unit can also play a role in tensioning the first belt, and the tightening unit provided at the bottom of the load-bearing frame can also perform tensioning adjustment on the second belt, ensuring the overall stable operation of the device. Due to the characteristics of the belt itself, elongation will occur over time. When the elongation amount is within the allowable range, by adjusting the position adjustment unit and the tightening unit, the utilization rate of the belt is improved, the use cost is lower, and it has good economic benefits. Description of the Drawings

[0020] The following further describes the present invention in conjunction with the drawings and embodiments:

[0021] Figure 1 is a schematic diagram of the present invention Figure 1 ;

[0022] Figure 2 is a schematic diagram of the present invention Figure 2 ;

[0023] Figure 3 is a schematic diagram of the present invention Figure 3 ;

[0024] Figure 4 is Figure 1 the front view schematic diagram of

[0025] Figure 5 is Figure 1 explosion structure schematic of Figure 1 ;

[0026] Figure 6 is Figure 1 explosion structure schematic of Figure 2 ;

[0027] Figure 7 is Figure 6 enlarged schematic of part A of ;

[0028] Figure 8 is Figure 1 explosion structure schematic of Figure 3 ;

[0029] Figure 9 is Figure 8 enlarged schematic of part B of ;

[0030] Figure 10 is Figure 1 explosion structure schematic of Figure 4 ;

[0031] Figure 11 is Figure 10 structure schematic of the sweeping unit installation and flipping unit of Figure 1 ;

[0032] Figure 12 is Figure 10 structure schematic of the sweeping unit installation and flipping unit of Figure 2 .

[0033] In the figure: load-bearing frame 1; first mounting frame 101; second mounting frame 102; third mounting frame 103; fixed plate 104; straight extension plate 105; third waist-shaped round hole 106; first extrusion unit 2; first round roller 201; second round roller 202; third round roller 203; first felt 204; second extrusion unit 3; fourth round roller 301; fifth round roller 302; second felt 303; first drive unit 4; first motor 401; first fixed sleeve 402; first belt 403; second fixed sleeve 404; second drive unit 5; second motor 501; third fixed sleeve 502; second belt 503; fourth fixed sleeve 504; top plate 6; boss 601; notch 602; first through hole 603; position adjustment unit 7; first cylinder body 701; first ejector rod 702; first clamping block 703; first arc-shaped opening 704; second clamping block 705; second arc-shaped opening 706; tightening unit 8; third motor 801; L-shaped plate 802; fifth fixed sleeve 803; screw rod 804; first threaded hole 805; clamping plate 806; limiting plate 807; second threaded hole 808; scraping unit 9; scraper 901; lifting lug 902; drive plate 903; baffle plate 904; first waist-shaped round hole 905; movable plate 906; second waist-shaped round hole 907; chamfer 908; third threaded hole 909; interval 910; flipping unit 10; second cylinder body 1001; second ejector rod 1002; arc head 1003; screw 11; 12; second compaction port 13; first bolt 14; second bolt 15; support frame 16. Detailed implementation mode

[0034] As Figures 1 - 5 shown in the figure, a pressing and dewatering device for paper production includes a first extrusion unit 2 and a second extrusion unit 3 arranged on a load-bearing frame 1. The second extrusion unit 3 is arranged above the first extrusion unit 2. The first extrusion unit 2 and the second extrusion unit 3 cooperate to form a first compaction port 12 and a second compaction port 13. The pulp passes through the first compaction port 12 and the second compaction port 13 in sequence to complete the pressing process. A scraping unit 9 is also arranged on one side of the top of the second extrusion unit 3 close to the second compaction port 13. The scraping unit is connected to the load-bearing frame 1 through a flipping unit 10. With this structure, the first compaction port 12 and the second compaction port 13 respectively play the roles of primary pressing and secondary pressing. At the same time, the opening of the first compaction port 12 is larger than that of the second compaction port 13. Through the above settings, it is ensured that the pulp can obtain primary pressing with a larger feeding amount, and then secondary pressing is carried out. The overall pressing effect is better, the pressing efficiency is higher, and at the same time, the overall pressing time is controllable, ensuring the stability of the production rhythm. When the pressing is completed, the caked paper scraps that may adhere to the second extrusion unit 3 are removed by the scraping unit 9. The overall process is stable. The flipping unit 10 can adjust the angle of the scraping unit 9 relative to the third extrusion unit 3 to ensure high efficiency in cleaning the caked paper scraps.

[0035] In a preferred embodiment, the first squeezing unit 2 includes a first round roller 201, a second round roller 202, and a third round roller 203, and the first felt 204 is wound around the first round roller 201, the second round roller 202, and the third round roller 203.

[0036] The second squeezing unit 3 includes a fourth round roller 301 and a fifth round roller 302, and the second felt 303 is wound around the fourth round roller 301 and the fifth round roller 302. The fifth round roller 302 and the second round roller 202 cooperate to form a first compaction port 12, and the fourth round roller 301 and the first round roller 201 cooperate to form a second compaction port 13.

[0037] The multiple round rollers cooperate with each other to ensure the stability of pressing. At the same time, the first felt 204 close to the third round roller 203 serves as the starting section for conveying pulp, which can support the pulp from the previous process and continuously supply it to the first round roller 201 and the second round roller 202. The design is compact and the use is convenient.

[0038] In a preferred embodiment, the load-bearing frame 1 includes a first mounting frame 101, a second mounting frame 102, and a third mounting frame 103 arranged in parallel. The first mounting frame 101, the second mounting frame 102, and the third mounting frame 103 are connected by a fixing plate 104. The fourth round roller 301 and the first round roller 201 are rotatably arranged on the first mounting frame 101, the fifth round roller 302 and the second round roller 202 are rotatably arranged on the second mounting frame 102, and the third round roller 203 is rotatably arranged on the third mounting frame 103.

[0039] Adopting a modular design ensures that the production costs of the first mounting frame 101, the second mounting frame 102, and the third mounting frame 103 are relatively low, and at the same time, the installation is convenient and the bearing capacity is stable.

[0040] In a preferred embodiment, a top plate 6 is provided on the top of the first mounting frame 101. A first driving unit 4 is provided on the top plate 6 for driving the fourth round roller 301 to rotate. A second driving unit 5 is provided on one side of the first mounting frame 101 for driving the first round roller 201 to rotate. The rotation directions of the first round roller 201 and the fourth round roller 301 are opposite.

[0041] The tangential directions of the adjacent sides of the first round roller 201 and the fourth round roller 301 face outward respectively, ensuring the stability of discharging. The top plate 6 serves as a temporary platform and provides an installation foundation. The first driving unit 4 and the second driving unit 5 are respectively arranged on both sides of the first mounting frame 101, so that there is a relatively large operating space during maintenance. Reducers can be provided on the first driving unit 4 and the second driving unit 5 as needed to ensure the stability of the rotation speed.

[0042] In a preferred embodiment, the first driving unit 4 includes a first motor 401. A first fixing sleeve 402 is provided at the end of the first motor 401. The first fixing sleeve 402 is connected to a second fixing sleeve 404 through a first belt 403. The second fixing sleeve 404 is sleeved on the end of the fourth roller 301.

[0043] The second driving unit 5 includes a second motor 501. A third fixing sleeve 502 is provided at the end of the second motor 501. The third fixing sleeve 502 is connected to a fourth fixing sleeve 504 through a second belt 503. The fourth fixing sleeve 504 is sleeved on the end of the first roller 201.

[0044] The first fixing sleeve 402, the second fixing sleeve 404, the third fixing sleeve 502 and the fourth fixing sleeve 504 are all provided with belt clamping grooves, and multiple belt clamping grooves can be provided according to needs to ensure the smooth rotation of the whole.

[0045] In a preferred embodiment, straight extension plates 105 are provided on the outer sides of the upper parts of the first mounting frame 101 and the second mounting frame 102. A third waist-shaped round hole 106 is provided through the upper side of the straight extension plate 105. The shafts of the fourth roller 301 and the fifth roller 302 are inserted into the third waist-shaped round hole 106. The straight extension plate 105 is connected to an adjustment unit 7 through a screw 11. The adjustment unit 7 supports on the shafts of the fourth roller 301 and the fifth roller 302.

[0046] The height of the fourth roller 301 and the fifth roller 302 can be changed through the adjustment unit 7, so as to change the distance relative to the first roller 201 and the second roller 202, ensuring the pressing effect. At the same time, the adjustment unit 7 can also play a role in tensioning. Due to the characteristics of the belt itself, the problem of elongation will occur as the use time increases. When the elongation amount is within the allowable range, through the adjustment of the adjustment unit, the utilization rate of the belt is improved and the use cost is lower.

[0047] As Figures 8 - 9 shown in [reference number], in a preferred embodiment, the adjustment unit 7 includes a first cylinder body 701 and a first ejector rod 702. The top of the first ejector rod 702 is connected to a second clamping block 705 through a first clamping block 703 and a screw 11. The first clamping block 703 and the second clamping block 705 are respectively provided with a first arc-shaped opening 704 and a second arc-shaped opening 706. The first arc-shaped opening 704 and the second arc-shaped opening 706 are attached to the shafts of the fourth roller 301 and the fifth roller 302. With this structure, the whole can be locked stably, installed and disassembled conveniently, and at the same time, the bearing capacity of the whole is strong.

[0048] As Figures 6 - 7Among them, in a preferred solution, a tightening unit 8 for adjusting the tightness of the second belt 503 is further provided on the fixing plate 104. The tightening unit 8 includes a third motor 801 and an L-shaped plate 802. The third motor 801 is connected to the L-shaped plate 802 through a screw 804. A fifth fixing sleeve 803 is rotatably provided on the L-shaped plate 802, and the second belt 503 is wound around the fifth fixing sleeve 803.

[0049] A first threaded hole 805 is provided through the L-shaped plate 802, and the screw 804 is inserted into the first threaded hole 805. Two clamping plates 806 are provided in parallel at the bottom of the L-shaped plate 802. A second threaded hole 808 is provided through the clamping plate 806, and the second threaded hole 808 is connected to a limiting plate 807 through a screw 11.

[0050] The tightening unit 8 can play a role in tensioning. Due to the characteristics of the belt itself, with the increase of the use time, the problem of elongation will occur. When the elongation amount is within the allowable range, by changing the position of the fifth fixing sleeve 803, the influence of the belt elongation is eliminated to a certain extent, ensuring the smooth operation of the whole.

[0051] Such as Figures 10 - 12 Among them, in a preferred solution, the scraping unit 9 includes a scraper 901 and a movable plate 906. The scraper 901 is connected to the movable plate 906 through a screw 11. A plurality of third threaded holes 909 are provided in parallel through the scraper 901. A plurality of second waist-shaped holes 907 are provided in parallel through the movable plate 906. The screw 11 is inserted into the second waist-shaped hole 907 and the third threaded hole 909. A chamfer 908 is provided at the end of the movable plate 906, and the chamfer 908 abuts against the second felt 303. With this structure, the position of the movable plate 906 can be flexibly adjusted within a certain range, ensuring the convenience of use, so as to better meet the need of cleaning caked paper scraps of different thicknesses.

[0052] In a preferred solution, a plurality of bosses 601 are provided in parallel on the top plate 6. A notch 602 is provided in the middle of the boss 601. A first through hole 603 is provided through the notch 602. A plurality of lifting lugs 902 are provided in parallel on one side of the scraper 901. The second pin 15 is inserted into the lifting lug 902 and the first through hole 603.

[0053] The flipping unit 10 includes a second cylinder body 1001 and a second ejector rod 1002. An arc head 1003 is provided at the end of the second ejector rod 1002. The second cylinder body 1001 is fixed to the top plate 6 through a support frame 16. A driving plate 903 is provided in the middle of the scraper 901. Two baffles 904 are provided in parallel on the inner side of the driving plate 903. A gap 910 is provided between the two baffles 904. A first waist-shaped hole 905 is provided through the baffle 904. The first pin 14 is inserted into the arc head 1003 and the first waist-shaped hole 905.

[0054] By driving the second ejector rod 1002 to change its position within the second cylinder block 1001, the angle of the scraper 901 relative to the cover plate 6 is changed. At the same time, the overall locking is stable, and according to the production requirements, quick adjustment can be made, with a fast adjustment rhythm, ensuring the overall production efficiency.

[0055] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A press dewatering device for paper production, characterized in that: It includes a first extrusion unit (2) and a second extrusion unit (3) provided on a load-bearing frame (1). The second extrusion unit (3) is provided on the upper side of the first extrusion unit (2). The first extrusion unit (2) and the second extrusion unit (3) cooperate to form a first compaction port (12) and a second compaction port (13). The pulp completes the pressing process after passing through the first compaction port (12) and the second compaction port (13) in sequence. On one side of the top of the second extrusion unit (3) near the second compaction port (13), a scraping unit (9) is further provided. The scraping unit (9) is connected to the load-bearing frame (1) through a flipping unit (10).

2. The press dewatering device for paper production according to claim 1, characterized in that: The first extrusion unit (2) includes a first round roller (201), a second round roller (202) and a third round roller (203). A first felt (204) is wound around the first round roller (201), the second round roller (202) and the third round roller (203). The second extrusion unit (3) includes a fourth round roller (301) and a fifth round roller (302). A second felt (303) is wound around the fourth round roller (301) and the fifth round roller (302). The fifth round roller (302) and the second round roller (202) cooperate to form a first compaction port (12), and the fourth round roller (301) and the first round roller (201) cooperate to form a second compaction port (13).

3. The press dewatering device for paper production according to claim 2, characterized in that: The load-bearing frame (1) includes a first mounting frame (101), a second mounting frame (102) and a third mounting frame (103) arranged in parallel. The first mounting frame (101), the second mounting frame (102) and the third mounting frame (103) are connected through a fixing plate (104). The fourth round roller (301) and the first round roller (201) are rotatably provided on the first mounting frame (101). The fifth round roller (302) and the second round roller (202) are rotatably provided on the second mounting frame (102). The third round roller (203) is rotatably provided on the third mounting frame (103).

4. The press dewatering device for paper production according to claim 3, characterized in that: A top plate (6) is provided on the top of the first mounting frame (101). A first driving unit (4) is provided on the top plate (6). The first driving unit (4) is used to drive the fourth round roller (301) to rotate. A second driving unit (5) is provided on one side of the first mounting frame (101). The second driving unit (5) is used to drive the first round roller (201) to rotate. The rotation directions of the first round roller (201) and the fourth round roller (301) are opposite.

5. The press dewatering device for paper production according to claim 4, characterized in that: The first driving unit (4) includes a first motor (401). A first fixing sleeve (402) is provided at the end of the first motor (401). The first fixing sleeve (402) is connected to a second fixing sleeve (404) through a first belt (403). The second fixing sleeve (404) is sleeved on the end of the fourth round roller (301). The second driving unit (5) includes a second motor (501). A third fixing sleeve (502) is provided at the end of the second motor (501). The third fixing sleeve (502) is connected to a fourth fixing sleeve (504) through a second belt (503). The fourth fixing sleeve (504) is sleeved on the end of the first round roller (201).

6. The press dewatering device for paper production according to claim 5, characterized in that: On the outer sides of the upper parts of the first mounting frame (101) and the second mounting frame (102), there are straight extension plates (105). A third waist-shaped round hole (106) runs through the upper side of the straight extension plate (105). The shaft rods of the fourth roller (301) and the fifth roller (302) are inserted into the third waist-shaped round hole (106). The straight extension plate (105) is connected with an adjustment unit (7) by screws (11), and the adjustment unit (7) is supported on the shaft rods of the fourth roller (301) and the fifth roller (302).

7. The press dewatering device for paper production according to claim 6, characterized in that: The adjustment unit (7) includes a first cylinder body (701) and a first ejector rod (702). The top of the first ejector rod (702) is connected with a second clamping block (705) through a first clamping block (703) and screws (11). The first clamping block (703) and the second clamping block (705) are respectively provided with a first arc-shaped opening (704) and a second arc-shaped opening (706). The first arc-shaped opening (704) and the second arc-shaped opening (706) are attached to the shaft rods of the fourth roller (301) and the fifth roller (302).

8. The press dewatering device for paper production according to claim 5, characterized in that: The fixing plate (104) is also provided with a tightening unit (8) for adjusting the tightness of the second belt (503). The tightening unit (8) includes a third motor (801) and an L-shaped plate (802). The third motor (801) is connected with the L-shaped plate (802) through a screw rod (804). A fifth fixing sleeve (803) is rotatably arranged on the L-shaped plate (802). The second belt (503) is wound around the fifth fixing sleeve (803). A first threaded hole (805) runs through the L-shaped plate (802). The screw rod (804) is inserted into the first threaded hole (805). Two clamping plates (806) are arranged in parallel at the bottom of the L-shaped plate (802). A second threaded hole (808) runs through the clamping plate (806). The second threaded hole (808) is connected with a limiting plate (807) by screws (11).

9. The press dewatering device for paper production according to claim 1, characterized in that: The scraping unit (9) includes a scraper (901) and a movable plate (906). The scraper (901) is connected with the movable plate (906) by screws (11). A plurality of third threaded holes (909) run through the scraper (901) in parallel. A plurality of second waist-shaped round holes (907) run through the movable plate (906) in parallel. The screws (11) are inserted into the second waist-shaped round holes (907) and the third threaded holes (909). A chamfer (908) is arranged at the end of the movable plate (906), and the chamfer (908) abuts against the second felt (303).

10. The press dewatering device for paper production according to claim 9, characterized in that: A plurality of convex platforms (601) are arranged in parallel on the top plate (6). A notch (602) is arranged in the middle of the convex platform (601). A first through hole (603) runs through the notch (602). A plurality of lifting lugs (902) are arranged in parallel on one side of the scraper (901). A second pin (15) is inserted into the lifting lugs (902) and the first through hole (603). The flipping unit (10) includes a second cylinder block (1001) and a second ejector rod (1002). An arc head (1003) is provided at the end of the second ejector rod (1002). The second cylinder block (1001) is fixed by a support frame (16) and a top plate (6). A driving plate (903) is provided in the middle of the scraper (901). Two baffles (904) are arranged in parallel on the inner side of the driving plate (903). A gap (910) is provided between the two baffles (904). A first waist-shaped round hole (905) is penetrated through the baffle (904). A first pin (14) is inserted into the arc head (1003) and the first waist-shaped round hole (905).

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