Drum-type dryer for organic fertilizer production

Abstract

The utility model relates to the technical field of drying equipment, and discloses an organic fertilizer production drum-type dryer which comprises two supports, the top of one support is fixedly connected with a second connecting shell, the top of the other support is fixedly connected with a first connecting shell, a drying drum is rotatably connected between the second connecting shell and the first connecting shell, and the drying drum is connected with the second connecting shell. Two annular sliding rails are fixedly connected to the outer side of the drying roller, a gear ring is fixedly connected to the outer side of the drying roller, a smashing mechanism is arranged in the drying roller, a purifying box is installed at the top of one support, supporting strips are fixedly connected to the inner wall of the purifying box, and an activated carbon plate is slidably connected to the interior of the purifying box. And the outer side of the purification box is fixedly connected with a fixed block. The drying roller and the connecting shaft rotate relatively to be matched with the smashing rods to smash materials, the elastic scraping plates are combined to clean the inner wall, the synergistic effect of drying, smashing and cleaning at the same time is achieved, fertilizer adhesion is effectively prevented, and the drying efficiency and the equipment stability are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to drying equipment technical field especially relates to a kind of organic fertilizer production roller dryer. BACKGROUND

[0002] In the organic fertilizer production process, raw materials are usually derived from livestock and poultry manure, straw, kitchen garbage and other biological organic waste, these raw materials still have high moisture content after pre-heap or high-temperature fermentation treatment, if not timely dehydration and drying, not only is not conducive to subsequent granulation, packaging and storage, but also can cause odor diffusion, nutrient loss, secondary pollution and other problems. Roller dryer is widely used in large-scale organic fertilizer production line due to its reasonable structure, strong continuous operation ability and high running stability. The internal roller structure can continuously turn the material during rotation, so that it is evenly heated and has high drying efficiency. At the same time, this type of equipment has strong adaptability, can handle materials with high moisture content, has good anti-clogging ability, and is suitable for large-scale continuous production of industrialization demand. Through drying treatment, not only can effectively reduce the moisture content of fertilizer, improve its storage stability, transportation convenience and market commercialization value, but also help to reduce the risk of incomplete fermentation or deterioration in later period, so as to ensure the stability and safety of product quality.

[0003] The current common roller dryer equipment has the following problems: first, there is no efficient material crushing and automatic cleaning structure in the roller, which can easily cause wet material aggregation and wall sticking, affecting the drying effect; second, the waste gas treatment structure design is simple, and the activated carbon plate is fixed by bolts, which not only is complicated to disassemble and assemble, but also needs tools, resulting in low replacement efficiency and inconvenient operation, affecting the normal operation and maintenance.

[0004] Therefore, an organic fertilizer production roller dryer is proposed to solve the above problems. UTILITY MODEL CONTENTS

[0005] In order to make up for the above shortcomings, the utility model provides an organic fertilizer production roller dryer, which aims to improve the problems of material adhesion, incomplete crushing and complicated replacement operation of activated carbon plate in existing equipment.

[0006] In order to achieve the above object, the utility model discloses the following technical scheme: a kind of organic fertilizer production drum dryer, including two supports, one the support top is fixedly connected with connecting shell two, another the support top is fixedly connected with connecting shell one, connecting shell two with connecting shell one between rotationally connected with drying drum, the drying drum outside is fixedly connected with two annular slide rails, the drying drum outside is fixedly connected with gear ring, the drying drum inside is provided with stirring mechanism, one the support top is equipped with purification tank, the purification tank inner wall is fixedly connected with support strip, the purification tank inside is slidably connected with activated carbon plate, the purification tank outside is fixedly connected with fixed block, the purification tank outside is provided with fixed mechanism, the purification tank with connecting shell one is communicated by air inlet pipe, one the support outside is equipped with driving device, the driving device output end is fixedly connected with gear wheel;

[0007] The stirring mechanism includes a connecting shaft, one end of the connecting shaft is fixedly connected to the inner wall of the connecting shell two, the other end of the connecting shaft is fixedly connected to the inner wall of the connecting shell one, a plurality of stirring rods are fixedly connected to the outer side of the connecting shaft, a cleaning assembly is provided at the end of the stirring rod away from the connecting shaft, and a plurality of smashing rods are fixedly connected to the outer side of the connecting shaft.

[0008] As a further description of the above technical solution:

[0009] The fixed mechanism includes an outer shell, the outer shell is fixedly connected to the outer side of the purification tank, an inner shell is fixedly connected to the inside of the outer shell, a bolt is slidably connected to the inside of the inner shell, a spring two is sleeved outside the bolt, and a temporary locking assembly is provided outside the bolt.

[0010] As a further description of the above technical solution:

[0011] The cleaning assembly includes a protective shell, the protective shell is fixedly connected to the end of the stirring rod away from the connecting shaft, a plurality of springs one are provided in the inside of the protective shell, a limiting plate is slidably connected to the inside of the protective shell, and a scraper is fixedly connected to one side of the limiting plate.

[0012] As a further description of the above technical solution:

[0013] The temporary locking assembly includes a backing plate, the backing plate is fixedly connected to the outside of the bolt, a clamping block is fixedly connected to the outside of the backing plate, and a U-shaped clamping groove is formed in the outside of the inner shell.

[0014] As a further description of the above technical solution:

[0015] One of the annular slide rails is slidably connected to the inside of the support, and the other annular slide rail is slidably connected to the inside of the connecting shell one.

[0016] As a further description of the above technical solutions:

[0017] The gear is engaged with the gear ring, the connecting shell two top is fixedly connected with the feeding pipe, and the connecting shell one bottom is fixedly connected with the discharging pipe.

[0018] As a further description of the above technical solutions:

[0019] The pin is inserted into the fixed block, the clamping block is slidingly connected in the U-shaped clamping groove, one end of the second spring is fixedly connected to the top of the backing plate, the other end of the second spring is in abutment with the inner wall of the inner shell, and the top of the supporting strip is in abutment with the bottom of the activated carbon plate.

[0020] As a further description of the above technical solutions:

[0021] The scraper penetrates through one side of the protection shell and is slidingly connected in the protection shell, the side, away from the limiting plate, of the scraper is in abutment with the inner wall of the drying drum, one end of the first spring is fixedly connected to the side, away from the scraper, of the limiting plate, and the other end of the first spring is in abutment with the inner wall of the protection shell.

[0022] The utility model has the following beneficial effects:

[0023] 1、The utility model discloses a drying drum and connecting shaft relative rotation cooperation broken pole carry out material crushing, and combine the structure design of scraping plate component cleaning drum inner wall of elastic force, realize the dynamic processing effect of fertilizer in the drum inside edge turns edge drying edge broken, edge cleaning. Compared with the problem that the stirring and cleaning function are separated, and the scraping plate is not stable in the traditional structure, the scheme can effectively prevent fertilizer accumulation and adhesion, significantly improve drying uniformity and equipment stability, and is more practical.

[0024] 2、The utility model discloses a drying drum and connecting shaft relative rotation cooperation broken pole carry out material crushing, and combine the structure design of scraping plate component cleaning drum inner wall of elastic force, realize the dynamic processing effect of fertilizer in the drum inside edge turns edge drying edge broken, edge cleaning. Compared with the problem that the stirring and cleaning function are separated, and the scraping plate is not stable in the traditional structure, the scheme can effectively prevent fertilizer accumulation and adhesion, significantly improve drying uniformity and equipment stability, and is more practical. ACCURACY OF DRAWINGS

[0025] Figure 1 A three-dimensional schematic view of an organic fertilizer production drum dryer is provided for the utility model;

[0026] Figure 2 For Figure 1 An enlarged schematic view of position A in the middle;

[0027] Figure 3A kind of organic fertilizer production cylinder dryer's purification box section of the utility model proposes the structure schematic diagram of section;

[0028] Figure 4 For Figure 3 The enlarged schematic view in B place;

[0029] Figure 5 A kind of organic fertilizer production cylinder dryer's inside structure schematic diagram is proposed in the utility model;

[0030] Figure 6 For Figure 5 The enlarged schematic view in C place.

[0031] Legend:

[0032] 1, drying cylinder;2, gear ring;3, purification box;4, connecting shell one;5, protective shell;6, air inlet pipe;7, discharge pipe;8, support;9, limit plate;10, connecting shell two;11, feed pipe;12, annular slide rail;13, spring one;14, scraper;15, driving device;16, gear;17, support strip;18, activated carbon plate;19, shell;20, U-shaped clamping groove;21, inner shell;22, bolt;23, spring two;24, pad;25, fixed block;26, clamping block;27, break rod;28, connecting shaft;29, stirring rod. Specific implementation

[0033] The technical scheme in the embodiments of the utility model will be described clearly and completely in conjunction with the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are within the scope of protection of the utility model.

[0034] Refer to Figure 1 - Figure 6The utility model provides an embodiment: an organic fertilizer production drum dryer, two supports 8, one support 8 top fixedly connected with connecting shell no. 2 10, another support 8 top fixedly connected with connecting shell no. 1 4, and the connecting shell no. 2 10 is rotatably connected with drying cylinder 1 between connecting shell no. 1 4, and the drying cylinder 1 outside fixedly connected with two annular slide rails 12, drying cylinder 1 outside fixedly connected with gear ring 2, drying cylinder 1 inside is provided with the mechanism of stirring and crushing, one support 8 top is installed with the purification box 3, and the purification box 3 inner wall is fixedly connected with the support strip 17, and the purification box 3 inside is slidably connected with activated carbon plate 18, and the purification box 3 outside is fixedly connected with fixed block 25, and the purification box 3 outside is provided with fixed mechanism, and the purification box 3 is communicated with connecting shell no. 1 4 through air inlet pipe 6, and one support 8 outside is installed with driving device 15, and driving device 15 output end is fixedly connected with gear 16;

[0035] The mechanism of stirring and crushing includes connecting shaft 28, and one end of connecting shaft 28 is fixedly connected in the inner wall of connecting shell no. 2 10, and the other end of connecting shaft 28 is fixedly connected in the inner wall of connecting shell no. 1 4, and a plurality of stirring rods 29 are fixedly connected outside connecting shaft 28, and the stirring rod 29 is provided with cleaning assembly away from one end of connecting shaft 28, and a plurality of broken rods 27 are fixedly connected outside connecting shaft 28, one annular slide rail 12 is slidably connected in the inside of support 8, and the other annular slide rail 12 is slidably connected in the inside of connecting shell no. 1 4, gear 16 is engaged with gear ring 2, connecting shell no. 2 10 top is fixedly connected with feed pipe 11, and connecting shell no. 1 4 bottom is fixedly connected with discharge pipe 7.

[0036] Two supports 8 respectively play the role of supporting the whole device, guaranteeing the stable operation of equipment. One support 8 top fixedly connected with connecting shell no. 2 10, another support 8 top fixedly connected with connecting shell no. 1 4, connecting shell no. 2 10 rotatably connected with drying cylinder 1 between connecting shell no. 1 4, drying cylinder 1 as the main cavity of fertilizer drying, realizes the uniform heating and conveying of fertilizer by rotating. Drying cylinder 1 outside fixedly connected with two annular slide rails 12, annular slide rail 12 is slidably connected in the inside of support 8 and connecting shell no. 1 4 respectively, plays the role of support and direction, ensures the stable rotation of cylinder. Drying cylinder 1 outside still fixedly connected with gear ring 2, realizes power transmission through the engagement with gear 16. Gear 16 is installed on the output end of driving device 15, and driving device 15 provides power source for the whole drying cylinder 1.

[0037] The inside of the drying drum 1 is provided with a crushing mechanism for crushing and stirring the fertilizer, improving the drying efficiency. The crushing mechanism includes a connecting shaft 28, one end of which is fixedly connected to the inner wall of the connecting shell two 10, and the other end is fixedly connected to the inner wall of the connecting shell one 4, which plays a supporting and driving role for the crushing parts. A plurality of stirring rods 29 are fixedly connected to the outer side of the connecting shaft 28 for stirring the fertilizer inside the drum. The end of the stirring rod 29 away from the connecting shaft 28 is provided with a cleaning assembly for cleaning the attachments on the inner wall of the drum to prevent the fertilizer from sticking. A plurality of crushing rods 27 are fixedly connected to the outer side of the connecting shaft 28 for crushing large pieces of fertilizer to improve the subsequent processing effect.

[0038] The purification box 3 is installed on the top of a support 8 for treating waste gas and odor generated during the drying process. The inner wall is fixedly connected with a support strip 17 for supporting the activated carbon plate 18. The purification box 3 is slidably connected with the activated carbon plate 18, which plays a role in adsorbing harmful gases and achieving purification and emission. The outer side of the purification box 3 is fixedly connected with a fixed block 25 for cooperating with the fixing mechanism to fix the activated carbon plate 18 in the purification box 3. The purification box 3 is communicated with the connecting shell one 4 through the air inlet pipe 6, so that the gas generated during the drying process enters the purification box 3 for treatment.

[0039] The connecting shell two 10 is fixedly connected with the feeding pipe 11 for feeding the raw materials into the inside of the drying drum 1 for drying treatment. The bottom of the connecting shell one 4 is fixedly connected with the discharge pipe 7 for discharging the treated organic fertilizer, realizing the purpose of continuous operation.

[0040] Referring to Figure 1 , Figure 3 and Figure 4 , the fixing mechanism includes a shell 19 fixedly connected to the outer side of the purification box 3. The inner shell 21 is fixedly connected inside the shell 19. The inner shell 21 is slidably connected with a latch 22. The latch 22 is sleeved with a spring two 23. The outer side of the latch 22 is provided with a temporary locking assembly.

[0041] The fixing mechanism comprises an outer shell 19 fixedly connected to the outside of the purification box 3, which serves to firmly connect the fixing mechanism with the purification box 3 and ensure that the activated carbon plate 18 is stably fixed with the purification box 3. The inner shell 21 is fixedly connected inside the outer shell 19 and serves to bear the bolt 22 and its parts. The bolt 22 is slidably connected inside the inner shell 21 and can slide during work to realize insertion into and extraction from the fixing block 25, thereby realizing the locking or unlocking function of the activated carbon plate 18. The bolt 22 is sleeved with the spring 23 on the outside, which provides elastic force for the bolt 22 to automatically recover during locking or unlocking, ensuring that the bolt 22 can quickly rebound to the original position and be tightly inserted into the fixing block 25 when needed. The bolt 22 is also provided with a temporary locking assembly on the outside, which is used to temporarily fix the position of the bolt 22 after it is extracted from the fixing block 25, preventing accidental loosening or displacement and ensuring the safe operation of the equipment.

[0042] Referring to Figure 1 , Figure 2 , Figure 5 and Figure 6 , the cleaning assembly comprises a protective shell 5 fixedly connected to the end of the stirring rod 29 away from the connecting shaft 28, a plurality of springs 13 are arranged inside the protective shell 5, a limiting plate 9 is slidably connected inside the protective shell 5, a scraper 14 is fixedly connected to one side of the limiting plate 9, the scraper 14 penetrates through one side of the protective shell 5 and is slidably connected inside the protective shell 5, and the side of the scraper 14 away from the limiting plate 9 abuts against the inner wall of the drying drum 1. One end of the spring 13 is fixedly connected to the side of the limiting plate 9 away from the scraper 14, and the other end of the spring 13 abuts against the inner wall of the protective shell 5.

[0043] The cleaning assembly comprises a protective shell 5 fixedly connected to the end of the stirring rod 29 away from the connecting shaft 28, which serves to connect the cleaning assembly with the stirring rod 29 and ensure that the cleaning assembly can normally operate when the drying drum 1 rotates. A plurality of springs 13 are arranged inside the protective shell 5, which serve to provide appropriate elastic force for the limiting plate 9 and the scraper 14, ensuring that the scraper 14 can effectively contact and clean the fertilizer attached to the inner wall of the drying drum 1. The limiting plate 9 is slidably connected inside the protective shell 5 and serves to limit the sliding range of the scraper 14 to prevent the scraper 14 from sliding out of the protective shell 5 during cleaning. The scraper 14 is fixedly connected to one side of the limiting plate 9, penetrates through one side of the protective shell 5 and is slidably connected inside the protective shell 5, and the side of the scraper 14 away from the limiting plate 9 abuts against the inner wall of the drying drum 1. During work, the scraper 14 scrapes off the fertilizer attached to the inner wall of the drying drum 1 by contacting the inner wall, preventing the fertilizer from sticking.

[0044] The one end of the spring 13 is fixedly connected to the limiting plate 9 away from the scraper 14, and the other end of the spring 13 is in abutment with the inner wall of the protective shell 5, so that the limiting plate 9 and the scraper 14 can work stably by the elastic force provided by the spring 13, the appropriate contact force is maintained, and it is ensured that the scraper 14 can effectively clean the inner wall of the drying drum 1. The cleaning assembly can effectively prevent the wet fertilizer from adhering to the inner wall of the drying drum 1, improve the drying efficiency, and maintain the long-term stable operation of the equipment.

[0045] With reference to Figure 3 and Figure 4 The temporary locking assembly comprises a backing plate 24 fixedly connected to the outside of the bolt 22, a clamping block 26 fixedly connected to the outside of the backing plate 24, a U-shaped clamping groove 20 formed in the outside of the inner shell 21, the bolt 22 being inserted into the fixed block 25, the clamping block 26 being slidingly connected to the inside of the U-shaped clamping groove 20, the one end of a spring 23 being fixedly connected to the top of the backing plate 24, the other end of the spring 23 being in abutment with the inner wall of the inner shell 21, and the top of the supporting strip 17 being in abutment with the bottom of the activated carbon plate 18.

[0046] The backing plate 24 is used for fixing the clamping block 26 and transmitting the elastic force of the spring 23 to the bolt 22, so that the bolt 22 can be tightly inserted into the fixed block 25 without external force. The U-shaped clamping groove 20 cooperates with the clamping block 26, so that when the bolt 22 is pulled out of the fixed block 25, the clamping block 26 can be clamped in the U-shaped clamping groove 20 by rotating the bolt 22, thereby temporarily locking the bolt 22. When the activated carbon plate 18 is replaced, the bolt 22 does not need to be pulled all the time. When it is necessary to unlock, the bolt 22 can be rotated, and the clamping block 26 can slide in the U-shaped clamping groove 20 by rotating the bolt 22 in the opposite direction. At this time, the bolt 22 is released, and under the action of the spring 23, the bolt 22 is inserted into the fixed block 25.

[0047] Working principle: when the device is used, the fertilizer to be dried is first put into the drying drum 1 through the feeding pipe 11, and then the driving device 15 is started. The driving device 15 drives the gear 16 to rotate, the gear 16 is engaged with the toothed ring 2, and then the drying drum 1 rotates at a set speed between the two supports 8. With the rotation of the drying drum 1, the connecting shaft 28 also rotates relatively, and the smashing rod 27 on the connecting shaft 28 rotates relatively, thereby gradually smashing the fertilizer. At the same time, the scraper 14 tightly adheres to the inner wall of the drying drum 1 under the action of the spring 13, so as to ensure that the adhering substances on the inner wall of the drum are cleaned, the fertilizer is prevented from adhering to the inner wall, and the dried fertilizer is discharged from the discharge pipe 7.

[0048] In the process of drying the fertilizer, the exhaust gas generated enters the purification tank 3 through the air inlet pipe 6. After the purification of the active carbon plate 18, the exhaust gas is discharged from the top of the purification tank 3. When the active carbon plate 18 needs to be replaced after being used for a period of time, first, the bolt 22 is pulled out of the fixed block 25, then the bolt 22 is rotated, so that the clamping block 26 is clamped into the U-shaped clamping groove 20. At this time, the bolt 22 is temporarily locked, and it is not necessary to hold the bolt 22 all the time. Next, the old active carbon plate 18 is taken out of the purification tank 3, and a new active carbon plate 18 is inserted. Finally, the bolt 22 is gently pulled, so that the bolt 22 can be rotated, and then the bolt 22 is rotated in the opposite direction, so that the clamping block 26 slides in the U-shaped clamping groove 20. After the bolt 22 is released, the bolt 22 will automatically rebound and be inserted into the fixed block 25 under the action of the spring 23, and the replacement of the active carbon plate 18 is completed.

[0049] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A drum dryer for the production of organic fertilizers, comprising two supports (8), characterized in that: One top of the bracket (8) is fixedly connected with a connecting shell two (10), another top of the bracket (8) is fixedly connected with a connecting shell one (4), the connecting shell two (10) and the connecting shell one (4) are rotatably connected with a drying roller (1), the outer side of the drying roller (1) is fixedly connected with two annular slide rails (12), the outer side of the drying roller (1) is fixedly connected with a gear ring (2), the inside of the drying roller (1) is provided with a crushing mechanism, one top of the bracket (8) is provided with a purification box (3), the inner wall of the purification box (3) is fixedly connected with a supporting strip (17), the inside of the purification box (3) is slidably connected with an activated carbon plate (18), the outer side of the purification box (3) is fixedly connected with a fixed block (25), the outer side of the purification box (3) is provided with a fixing mechanism, the purification box (3) and the connecting shell one (4) are communicated through an air inlet pipe (6), one outer side of the bracket (8) is provided with a driving device (15), the output end of the driving device (15) is fixedly connected with a gear (16). The crushing mechanism comprises a connecting shaft (28), one end of the connecting shaft (28) is fixedly connected with the inner wall of the connecting shell two (10), the other end of the connecting shaft (28) is fixedly connected with the inner wall of the connecting shell one (4), the outer side of the connecting shaft (28) is fixedly connected with a plurality of stirring rods (29), one end of the stirring rod (29) away from the connecting shaft (28) is provided with a cleaning assembly, the outer side of the connecting shaft (28) is fixedly connected with a plurality of smashing rods (27).

2. The organic fertilizer production drum dryer according to claim 1, characterized in that: The fixing mechanism comprises an outer shell (19), the outer shell (19) is fixedly connected with the outer side of the purification box (3), the inner shell (21) is fixedly connected with the inner shell (21), the inner shell (21) is slidably connected with a bolt (22), the outer side of the bolt (22) is sleeved with a spring two (23), and the outer side of the bolt (22) is provided with a temporary locking assembly.

3. The organic fertilizer production drum dryer according to claim 1, characterized in that: The cleaning assembly comprises a protective shell (5), the protective shell (5) is fixedly connected with the outer side of the stirring rod (29) away from the connecting shaft (28), the protective shell (5) is provided with a plurality of springs one (13) in the inside, the protective shell (5) is slidably connected with a limiting plate (9) in the inside, and the limiting plate (9) is fixedly connected with a scraper (14) on one side.

4. The organic fertilizer production drum dryer according to claim 2, characterized in that: The temporary locking assembly comprises a backing plate (24), the backing plate (24) is fixedly connected with the outer side of the bolt (22), the outer side of the backing plate (24) is fixedly connected with a clamping block (26), and the outer side of the inner shell (21) is provided with a U-shaped clamping groove (20).

5. The organic fertilizer production drum dryer according to claim 1, characterized in that: One annular slide rail (12) is slidably connected in the inside of the bracket (8), and the other annular slide rail (12) is slidably connected in the inside of the connecting shell one (4).

6. The organic fertilizer production drum dryer according to claim 1, characterized in that: The gear (16) is engaged with the gear ring (2), the top of the connecting shell two (10) is fixedly connected with a feeding pipe (11), and the bottom of the connecting shell one (4) is fixedly connected with a discharging pipe (7). The gear (16) is engaged with the gear ring (2), the top of the connecting shell two (10) is fixedly connected with a feeding pipe (11), and the bottom of the connecting shell one (4) is fixedly connected with a discharging pipe (7).

7. The organic fertilizer production drum dryer according to claim 4, characterized in that: The plug-in bolt (22) is plugged inside the fixed block (25), the clamping block (26) is slidingly connected inside the U-shaped clamping groove (20), one end of the spring two (23) is fixedly connected to the top of the backing plate (24), the other end of the spring two (23) abuts against the inner wall of the inner shell (21), and the top of the supporting strip (17) abuts against the bottom of the activated carbon plate (18).

8. The organic fertilizer production drum dryer according to claim 3, characterized in that: The scraper (14) penetrates through one side of the protective shell (5) and is slidingly connected inside the protective shell (5), the side, away from the limiting plate (9), of the scraper (14) abuts against the inner wall of the drying cylinder (1), one end of the spring one (13) is fixedly connected to the side, away from the scraper (14), of the limiting plate (9), and the other end of the spring one (13) abuts against the inner wall of the protective shell (5).

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