CN117510021B - Sludge dewatering equipment - Google Patents

Abstract

The invention discloses sludge dewatering equipment, and relates to the technical field of sludge treatment. The sludge dewatering equipment is characterized in that a shell is provided with a feed inlet, a treatment space and a discharge outlet, the feed inlet is communicated with the treatment space, the treatment space is also communicated with the discharge outlet, and a first extrusion assembly and a second extrusion assembly are arranged in the treatment space in a transmission manner; the first extrusion assembly comprises a force application part and a first extrusion surface, wherein the force application part is used for applying pressure to the first extrusion surface; the second extrusion assembly comprises a plurality of extrusion units, each extrusion unit comprises a base body and an elastic partition plate, the elastic partition plates are arranged on one side of the base body or on two sides of the base body in a telescopic mode, two adjacent extrusion units are separated through the elastic partition plates, the upper surface of the base body of each extrusion unit is formed into a second extrusion surface, and an area between the second extrusion surface and the first extrusion surface is formed into an extrusion area. The sludge dewatering equipment disclosed by the invention not only can improve the dewatering efficiency and the dewatering effect of the sludge dewatering equipment, but also can reduce the burden of a subsequent drying process.

Description

Sludge dewatering equipment

Technical Field

The invention relates to the technical field of sludge treatment, in particular to sludge dewatering equipment.

Background

For sludge produced in industrial production and daily life, a mechanical dehydration mode is usually adopted for treatment, and crawler-type dehydration equipment has become a common sludge dehydration equipment because of continuous high-efficiency treatment capacity. The crawler-type dewatering equipment comprises a flocculation station, a gravity sedimentation station and an extrusion station, wherein the flocculation station is used for quickly separating water from solid sludge by adding a flocculating agent into water-bearing sludge, the sedimentation station is used for filtering and separating water from filter cloth by means of gravity, and the filtered solid sludge is discharged into the extrusion station and is extruded through an upper crawler belt and a lower crawler belt to obtain a mud cake structure with lower final water content.

The water content of the sludge dehydrated by the crawler-type dehydration equipment is still above 70%, the water content is still higher, and the dehydration efficiency and the dehydration effect are both improved. Specifically, the inventors found that: the upper and lower tracks of the crawler-type dewatering equipment are generally of planar structures, and in the extrusion process, part of sludge is not only caused to move in the direction opposite to the transmission direction of the tracks, so that part of sludge cannot be extruded, and the dewatering efficiency of the crawler-type dewatering equipment is affected; and moreover, the mud cake formed by the extrusion station is of an integral structure, so that the mud cake is large in size, the dehydration effect of crawler-type dehydration equipment is affected, and the burden of a subsequent drying process is increased.

Therefore, the sludge dewatering equipment with high dewatering efficiency and good dewatering effect is a technical problem to be solved urgently by the person skilled in the art.

Disclosure of Invention

The invention discloses sludge dewatering equipment, which aims to solve the technical problems that the dewatering efficiency and the dewatering effect of crawler-type dewatering equipment in the related art are to be improved.

In order to solve the problems, the invention adopts the following technical scheme:

The sludge dewatering equipment comprises a shell, a first extrusion assembly and a second extrusion assembly, wherein a feed inlet, a treatment space and a discharge outlet are formed in the shell, the feed inlet is communicated with the treatment space, the treatment space is also communicated with the discharge outlet, and the first extrusion assembly and the second extrusion assembly are arranged in the treatment space in a transmission manner; the first extrusion assembly comprises a force application part and a first extrusion surface, wherein the force application part is used for applying pressure to the first extrusion surface; the second extrusion subassembly includes a plurality of extrusion units, extrusion unit includes base member and elastic diaphragm, elastic diaphragm in vertical direction telescopic set up in one side of base member or the both sides of base member, adjacent two extrusion unit passes through elastic diaphragm separates, the upper surface of the base member of extrusion unit forms to the second extrusion face, the second extrusion face with the region between the first extrusion face forms to the extrusion region, elastic diaphragm can be based on the mud volume in the extrusion region is adjusted the elastic diaphragm stretches out the height of the upper surface of base member.

Further, the elastic partition plate comprises a partition plate body and first elastic pieces, wherein the partition plate body is movably arranged on one side of the base body or on two sides of the base body, the first elastic pieces are arranged on the base body, and when the partition plate body is subjected to pressure in the vertical direction, the partition plate body moves downwards and drives the first elastic pieces to be in a compressed state; when the pressure of the vertical direction is relieved, the first elastic piece is in a straightening state and drives the partition plate body to reset.

Further, the elastic separator further comprises a second elastic member, the second elastic member is mounted on the separator body, the second extrusion assembly further comprises a first adjusting part, the first adjusting part is fixed on the shell, and when the first adjusting part blocks the separator body, the distance between the separator body and the adjacent separator body is reduced, and the second elastic member is in a compressed state; when the first adjusting part releases the blocking of the baffle body, the second elastic piece is in a straightening state and drives the baffle body to reset.

Further, the first adjusting part comprises a mounting plate, a stop block and a third elastic piece, wherein the mounting plate is fixed on the shell, a first sliding groove is formed in the mounting plate, the first sliding groove comprises a horizontal part and an inclined part, a first distance between the horizontal part and the upper surface of the base body is smaller than a second distance between the inclined part and the upper surface of the base body, the stop block is slidably arranged in the first sliding groove, the third elastic piece is connected with the stop block, when the stop block is positioned in the horizontal part, the stop block blocks the baffle body, and the third elastic piece is in a natural state, when the thrust of the baffle body to the stop block is larger than the blocking force of the stop block to the baffle body, the baffle body drives the stop block to slide to the inclined part, and the third elastic piece is in a compressed state, and when the thrust of the baffle body to the stop block is eliminated, the third elastic piece resets and drives the stop block to slide to the horizontal part.

Further, the second pressing assembly further comprises a mounting groove fixed to two sides of the housing, the pressing unit further comprises a first mounting shaft slidably mounted in the mounting groove, and the first mounting shaft is further connected with the base body and used for supporting the base body.

Further, the first extrusion assembly further comprises a partition extrusion part, the partition extrusion part is fixed on the force application part and two sides of the first extrusion surface, first protruding parts are arranged at two ends of the partition body and protrude out of the upper surface of the partition body, and when the force application part applies pressure to the first extrusion surface, the partition extrusion part is in contact with the first protruding parts and applies pressure in the vertical direction to the partition body.

Further, a second protruding portion is further arranged at one end, close to the discharge hole, of the partition plate extruding portion, and the second protruding portion is in contact with the second extruding surface.

Further, a second sliding groove is formed in the shell, the force application part is slidably installed in the second sliding groove, the first extrusion assembly further comprises a second adjusting part, the second adjusting part is used for adjusting the distance between the first extrusion surface and the second extrusion surface, a fourth elastic piece is arranged on the second adjusting part, and when the force application part slides downwards under the action of gravity, the fourth elastic piece is in an extension state; when the force application part is also subjected to the acting force opposite to the gravity direction, the fourth elastic piece is in a reset state and drives the force application part to slide upwards.

Further, the sludge dewatering equipment also include the scraper subassembly, the scraper subassembly is located discharge gate department, and the scraper subassembly includes first scraper and second scraper, first scraper is located first extrusion face department, first scraper is used for striking off the mud on the first extrusion face, the second scraper is located second extrusion face department, the second scraper is used for striking off the mud on the second extrusion face.

Further, the second scraper comprises a scraping part and a shielding part, the scraping part is rotatably connected with the shielding part, a first limiting part is arranged below the scraping part and used for limiting the rotating angle of the scraping part, a second limiting part is arranged below the shielding part and used for limiting the rotating angle of the shielding part.

The technical scheme adopted by the invention can achieve the following beneficial effects:

According to the sludge dewatering equipment disclosed by the invention, the second extrusion assembly comprises a plurality of extrusion units, each extrusion unit comprises a substrate and an elastic partition plate, two adjacent extrusion units are separated by the elastic partition plates, the upper surface of the substrate of each extrusion unit is formed into a second extrusion surface, so that the second extrusion surface can be divided into a plurality of extrusion spaces by the elastic partition plates, sludge entering from a feed inlet falls into each extrusion space, the first extrusion surface extrudes and dewaters the sludge in each extrusion space, and in the extrusion dewatering process, the sludge in each extrusion space is limited in each area by the partition plates, so that part of sludge moves in the direction opposite to the transmission direction of the second extrusion assembly, and extrusion force between the first extrusion surface and the second extrusion surface is reduced, and the dewatering efficiency and the dewatering effect of the sludge dewatering equipment are affected; on the other hand, the second extrusion surface is divided into a plurality of extrusion spaces through the elastic partition plate, so that the size of the mud cake discharged from the discharge hole can be reduced, and the mud cake drying and other treatments can be facilitated in the subsequent process.

Therefore, the sludge dewatering equipment provided by the invention has the advantages that the second extrusion surface is divided into a plurality of extrusion spaces through the elastic partition plate, so that the dewatering efficiency and the dewatering effect of the sludge dewatering equipment can be improved, the burden of a subsequent drying process can be reduced, and the technical problem that the dewatering efficiency and the dewatering effect of the crawler-type dewatering equipment in the related technology are to be improved is solved.

According to the sludge dewatering equipment disclosed by the invention, the elastic partition plate arranged on the side surface of the substrate is of a structure which can be stretched in the vertical direction, the height of the elastic partition plate extending out of the upper surface of the substrate can be adjusted based on the sludge amount in the extrusion area, and the elastic partition plate which can be stretched in the vertical direction can adapt to the change of the sludge amount between the first extrusion surface and the second extrusion surface in the extrusion dewatering process of the first extrusion surface and the second extrusion surface, so that the downward moving distance of the first extrusion surface can not be limited due to the arrangement of the elastic partition plate under the condition of small feeding amount. Namely, the method comprises the following steps: according to the sludge dewatering equipment, the partition plate is of the telescopic structure, so that the first extrusion surface and the second extrusion surface can always extrude sludge in the extrusion area, and the dewatering efficiency and the dewatering effect of the sludge dewatering equipment can be ensured.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of a sludge dewatering apparatus according to an embodiment of the present application;

FIG. 2 is a first partial schematic view of a sludge dewatering apparatus according to an embodiment of the present application;

FIG. 3 is a second partial schematic view of a sludge dewatering apparatus according to an embodiment of the present application;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is an enlarged view of portion B of FIG. 3;

FIG. 6 is a third partial schematic view of a sludge dewatering apparatus according to an embodiment of the present application;

FIG. 7 is an enlarged view of portion C of FIG. 6;

FIG. 8 is a fourth partial schematic view of a sludge dewatering apparatus according to an embodiment of the present application;

FIG. 9 is an enlarged view of portion D of FIG. 8;

FIG. 10 is a fifth partial schematic view of a sludge dewatering apparatus according to an embodiment of the present application;

FIG. 11 is an enlarged view of portion E of FIG. 10;

FIG. 12 is a sixth partial schematic view of a sludge dewatering apparatus according to an embodiment of the present application;

fig. 13 is an enlarged view of the portion F in fig. 12;

FIG. 14 is a seventh partial schematic view of a sludge dewatering apparatus according to an embodiment of the present application;

fig. 15 is an enlarged view of a portion G in fig. 14;

FIG. 16 is a partial exploded view of a first adjustment portion of an embodiment of the present application;

Fig. 17 is a schematic view showing a structure in which the first regulating portion is in a blocking state according to the embodiment of the present application;

Fig. 18 is a schematic structural view of the first adjusting portion in the dodged state according to the embodiment of the present application;

FIG. 19 is a partial exploded view of a substrate according to an embodiment of the present application;

FIG. 20 is a schematic view of the structure of the elastic partition on the base of the embodiment of the present application in an extended state;

FIG. 21 is a schematic view of the structure of an elastic separator plate in a compressed state on a base according to an embodiment of the present application;

FIG. 22 is a first schematic view of another preferred construction of a substrate in accordance with an embodiment of the present application;

FIG. 23 is a second schematic view of another preferred construction of a substrate in accordance with an embodiment of the present application;

FIG. 24 is a H-H cross-sectional view of FIG. 23;

FIG. 25 is a schematic view of another preferred construction of a base of an embodiment of the present application with the elastomeric barrier in an extended and mutually compressed state;

FIG. 26 is a schematic view of the structure of an elastic separator plate in an uncompressed state according to an embodiment of the present application;

FIG. 27 is a schematic view showing the structure of the elastic separator in a mutually pressed state according to the embodiment of the present application;

FIG. 28 is a schematic view of another preferred construction of a base of an embodiment of the present application, with the elastomeric baffles in a compressed and uncompressed state.

In the figure: 100. a housing; 110. a feed inlet; 120. a processing space; 130. a discharge port; 140. a second chute; 150. a hinged plate; 200. a first press assembly; 210. a force application part; 220. a first pressing surface; 230. a separator pressing portion; 231. a second protruding portion; 240. a second adjusting part; 241. a fourth elastic member; 242. a second support column; 300. a second extrusion assembly; 310. an extrusion unit; 311. a base; 3111. an upper surface; 3112. a support plate; 3113. a first support column; 3114. a clamping block; 312. an elastic partition; 3121. a separator body; 3121a, a first lobe; 3121b, guide posts; 3121c, a clamping groove; 3121d, avoidance gap; 3122. a first elastic member; 3123. a second elastic member; 313. a first mounting shaft; 320. a second pressing surface; 330. an extrusion region; 340. a first adjusting part; 341. a mounting plate; 3411. a first chute; 3411a, horizontal part; 3411b, inclined portion; 342. a stop block; 343. a third elastic member; 344. a mounting rod; 345. a fixing member; 346. a baffle; 350. a mounting groove; 400. a scraper assembly; 410. a first scraper; 420. a second scraper; 421. a scraping section; 422. a shielding part; 423. a first limit part; 424. a second limit part; 425. and (3) a torsion spring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

The sludge dewatering equipment provided by the embodiment of the application is described in detail below by means of specific embodiments and application scenarios thereof with reference to fig. 1 to 28.

The sludge dewatering equipment of the present embodiment includes a housing 100, a first pressing assembly 200, and a second pressing assembly 300, as shown in fig. 1 to 3, 6, 8, 10, 12, and 14. The present embodiment will be described in detail only with respect to the first pressing assembly 200 and the second pressing assembly 300 of the sludge dewatering apparatus, and the remaining structures of the sludge dewatering apparatus, such as the water collecting assembly, may be the structures of the prior art, and will not be described in detail herein.

The housing 100 provides a support foundation for the remaining components. Specifically, the casing 100 is provided with a feed inlet 110, a processing space 120 and a discharge outlet 130, where the feed inlet 110 is communicated with the processing space 120, and the processing space 120 is also communicated with the discharge outlet 130, as shown in fig. 1-3, 6, 8, 10, 12 and 14. The sludge to be treated entering from the feed inlet 110 enters the treatment space 120 for extrusion dehydration treatment, and the dehydrated sludge cake is discharged from the discharge outlet 130 to complete the dehydration process.

The first and second pressing assemblies 200 and 300 are drivingly disposed within the processing space 120 as shown in fig. 3, 6, 8, 10, 12 and 14. Specifically, the first extrusion assembly 200 and the second extrusion assembly 300 can be driven to drive by a driving component such as a motor, and the transmission structure of the driving component can be the same as that of the prior art, which is not described herein. The driving directions of the first and second pressing assemblies 200 and 300 may be opposite, for example, the first pressing assembly 200 is driven in a counterclockwise direction and the second pressing assembly 300 is driven in a clockwise direction.

The first pressing assembly 200 includes a force application portion 210 and a first pressing surface 220, and the force application portion 210 is configured to apply pressure to the first pressing surface 220, as shown in fig. 3, 6, 8, 10, 12, and 14. Specifically, the force application part 210 includes a plurality of squeeze rollers, and the squeeze rollers can apply pressure to the first squeeze surface 220 by using their own weight due to their own weight, so as to achieve the squeeze dewatering effect in cooperation with the second squeeze assembly 300. The first pressing surface 220 may be a track or belt.

The second pressing assembly 300 includes a plurality of pressing units 310, and the number of the pressing units 310 may be determined based on the specification size of the apparatus, as shown in fig. 3, 6, 8, 10, 12, and 14. The pressing unit 310 includes a base 311 and an elastic partition 312, as shown in fig. 4. The elastic partition 312 is disposed at one side of the base 311 or both sides of the base 311, and the elastic partition 312 is stretchable in a vertical direction. The vertical direction is the up-down direction as shown in fig. 3. Fig. 19 to 28 specifically show schematic structural views of the base 311 and the elastic partition 312. Adjacent two pressing units 310 are separated by an elastic partition 312, as shown in fig. 3. The upper surface 3111 of the base 311 of the pressing unit 310 is formed as a second pressing surface 320, and a region between the second pressing surface 320 and the first pressing surface 220 is formed as a pressing region 330, as shown in fig. 3, 6, 8, 10, 12, and 14. Specifically, when the elastic partition 312 is in a natural state, the elastic partition 312 protrudes from the upper surface 3111 of the base 311, so that the second pressing surface 320 can be divided into a plurality of independent areas by the elastic partition 312. Fig. 20 and 22 show schematic views of the elastic partition 312 in a natural state. The squeezing area 330 is an area for squeezing and dewatering the sludge.

The elastic partition 312 can adjust the height of the elastic partition 312 protruding from the upper surface 3111 of the base 311 based on the amount of sludge in the pressing region 330. Specifically, when the amount of sludge in the pressing area 330 is small, the gap between the first pressing surface 220 and the second pressing surface 320 is small, the elastic partition 312 is compressed, and the height of the elastic partition protruding from the upper surface 3111 of the base 311 is small; when the amount of sludge in the squeeze area 330 is large, the gap between the first squeeze surface 220 and the second squeeze surface 320 is large, and the height of the elastic partition 312 extending out of the upper surface 3111 of the base 311 is large. Fig. 20 and 22 show schematic views of the elastomeric caul 312 extending to a greater height above the upper surface 3111 (i.e., in a natural or uncompressed state); fig. 21 and 28 illustrate a schematic view of the elastomeric caul 312 extending a small height (i.e., compressed) above the upper surface 3111.

In the above technical solution, the second extrusion assembly 300 includes a plurality of extrusion units 310, each extrusion unit 310 includes a base 311 and an elastic partition 312, two adjacent extrusion units 310 are separated by the elastic partition 312, and an upper surface 3111 of the base 311 of each extrusion unit 310 is formed into a second extrusion surface 320, so that it can be seen that the second extrusion surface 320 can be separated into a plurality of extrusion spaces by the elastic partition 312, sludge entering from the feed inlet 110 falls into each extrusion space, the first extrusion surface 220 performs extrusion dehydration on the sludge in each extrusion space, and during the extrusion dehydration, the sludge in each extrusion space is limited in each region by the partition, so that part of the sludge can be prevented from moving in a direction opposite to the transmission direction of the second extrusion assembly 300, and the extrusion force between the first extrusion surface 220 and the second extrusion surface 320 is reduced, thereby affecting the dehydration efficiency and the dehydration effect of the sludge dehydration apparatus; on the other hand, the second pressing surface 320 is divided into a plurality of pressing spaces by the elastic partition plate 312, so that the size of the mud cake discharged from the discharge port 130 can be reduced, and the subsequent processes of drying the mud cake and the like can be facilitated.

It can be seen that, in the sludge dewatering device of this embodiment, the elastic partition plate 312 separates the second extrusion surface 320 into a plurality of extrusion spaces, so that not only can the dewatering efficiency and the dewatering effect of the sludge dewatering device be improved, but also the burden of the subsequent drying process can be reduced, and the technical problem that the dewatering efficiency and the dewatering effect of the crawler-type dewatering device in the related art are to be improved is solved.

In a second aspect, in the sludge dewatering apparatus of the present embodiment, the elastic partition 312 disposed on the side of the substrate 311 is of a structure that is retractable in the vertical direction, the elastic partition 312 can adjust the height of the elastic partition 312 extending out of the upper surface 3111 of the substrate 311 based on the amount of sludge in the extrusion area 330, and in the process of extrusion dewatering of the first extrusion surface 220 and the second extrusion surface 320, the elastic partition 312 that is retractable in the vertical direction can adapt to the change of the amount of sludge between the first extrusion surface 220 and the second extrusion surface 320, so that the distance of downward movement of the first extrusion surface 220 is not limited due to the arrangement of the elastic partition 312 in the case of smaller feeding amount. Namely, the method comprises the following steps: in the sludge dewatering device of the embodiment, the partition plate is set to be of a telescopic structure, so that the first extrusion surface 220 and the second extrusion surface 320 can always extrude the sludge in the extrusion area 330, and the dewatering efficiency and the dewatering effect of the sludge dewatering device can be ensured. According to a preferred embodiment, the resilient spacer 312 includes a spacer body 3121 and a first resilient member 3122, as shown in fig. 19-25. The first resilient member 3122 may be a spring. The spacer body 3121 is movably disposed at one side of the base 311 or both sides of the base 311 in the vertical direction, and preferably, the spacer body 3121 is movably disposed at both sides of the base 311, so that sludge can be prevented from falling into a gap between two adjacent pressing units 310. The first resilient member 3122 is mounted to the base 311. Specifically, the base 311 has a support plate 3112, a first support column 3113 is fixed on the support plate 3112, and the first elastic member 3122 is sleeved on the first support column 3113, as shown in fig. 19-25. When the diaphragm body 3121 receives pressure in the vertical direction (the pressure is derived from the gravity of the force application portion 210), the diaphragm body 3121 moves downward and drives the first elastic member 3122 to be in a compressed state; when the diaphragm body 3121 is relieved by the pressure in the vertical direction, the first elastic member 3122 is in a straightened state and drives the diaphragm body 3121 to return.

Fig. 20 and 21 show schematic views of the spacer body 3121 in a natural state and a compressed state, respectively; fig. 22 and 25 show schematic views of a separator body 3121 of another base structure in a natural state; fig. 28 shows a schematic view of a separator body 3121 of another base structure in a compressed state.

According to the sludge dewatering equipment of the preferred technical scheme of the embodiment, through the action of the first elastic piece 3122, the expansion and contraction of the partition plate body 3121 in the vertical direction can be realized, so that the dewatering efficiency and the dewatering effect of the sludge dewatering equipment can be improved through the arrangement of the elastic partition plate 312, the burden of the subsequent drying process is reduced, and meanwhile, the distance of downward movement of the first extrusion surface 220 is not limited due to the arrangement of the elastic partition plate 312.

According to a preferred embodiment, the resilient spacer 312 further includes a second resilient member 3123, shown in fig. 24, 26 and 27. The second resilient member 3123 may be a spring. The second elastic member 3123 is installed on the spacer body 3121. Specifically, the spacer body 3121 is provided with a guide post 3121b, and the second elastic member 3123 is mounted on the guide post 3121b, as shown in fig. 25-27. The guide posts 3121b may not only function to support the second resilient member 3123, but may also provide a guide for the sliding movement of the resilient membrane 312 in a horizontal direction. The horizontal direction is the front-rear direction as shown in fig. 22. Preferably, the spacer body 3121 is provided with a clamping groove 3121c, the base 311 is provided with a clamping block 3114, and the clamping groove 3121c is slidably clamped on the clamping block 3114, as shown in fig. 25.

The second pressing assembly 300 further includes a first adjusting portion 340, where the first adjusting portion 340 is used for adjusting the distance between the spacer body 3121 and the left spacer body 3121 thereof, as shown in fig. 10 to 15. The number of the first adjusting parts 340 may be not limited, and may be one or more. Fig. 10, 12 and 14 show only a schematic structure provided with one first adjusting portion 340. The number of the first regulating parts 340 is preferably plural so that the sludge between the adjacent two spacer bodies 3121 can be pressed in the horizontal direction a plurality of times. Further, when the number of the first adjusting portions 340 is plural, the ability of each first adjusting portion 340 to adjust the distance between the two spacer bodies 3121 may be the same, or may be: the first adjusting part 340 gradually increases the ability of adjusting the distance between the two spacer bodies 3121 from the direction of the inlet 110 to the outlet 130, so that the dehydrating effect of the sludge dehydrating apparatus can be further improved.

Fig. 16 to 18 specifically show a schematic structural view of the first adjusting portion 340. The first adjusting part 340 is fixed to the housing 100, and the first adjusting part 340 is located between the inlet 110 and the outlet 130. Specifically, the first adjusting portion 340 may be fixed to the housing 100 by means of screws, snaps, or adhesive, and a fixing structure thereof is not shown. When the first adjusting portion 340 blocks the spacer body 3121, the distance between the spacer body 3121 and the spacer body 3121 on the left side thereof is reduced, and the second elastic member 3123 is put in a compressed state; when the blocking of the spacer body 3121 by the first adjusting portion 340 is released, the second elastic member 3123 is in a straightened state and drives the spacer body 3121 to be restored, and simultaneously the distance between the spacer bodies 3121 is increased.

As shown in fig. 10 to 15, in the clockwise transferring process of the second pressing assembly 300, the separator body 3121 thereon is also transferred clockwise, when the first adjusting portion 340 blocks the separator body 3121, the transfer of the separator body 3121 clockwise is blocked, and the separator body 3121 on the left side of the separator body 3121 is still transferred clockwise at a normal speed, so that the distance between the separator body 3121 and the separator body 3121 on the left side thereof is reduced, and the sludge located in the pressing area can be further pressed in the horizontal direction by pressing of the two separator bodies 3121; on the other hand, since the distance between the partition body 3121 and the partition body 3121 on the left side thereof is reduced, the volume of the pressing area formed by the two partition bodies 3121 is reduced, thereby also facilitating the pressing of the sludge in the area by the force application portion. Fig. 25 and 27 show schematic views after the distance between the two spacer bodies 3121 is reduced.

The feeding amount is larger at part of the time, so that the first extrusion surface 220 and the second extrusion surface 320 are located at a first distance, the feeding amount is smaller at part of the time, the first distance is still kept between the first extrusion surface 220 and the second extrusion surface 320, and at the time of the smaller feeding amount, the extrusion dehydration of the sludge cannot be fully realized by the first extrusion surface 220 and the second extrusion surface 320, so that the sludge dehydration effect at the time is poor. According to the sludge dewatering equipment of the preferred technical scheme of the embodiment, the distance between the baffle body 3121 and the baffle body 3121 at the left side thereof can be reduced by arranging the first adjusting part 340, so that the extrusion effect of the first extrusion surface 220 on the sludge can be ensured, meanwhile, the baffle body 3121 and the baffle body 3121 at the left side thereof can also extrude the sludge in the horizontal direction, further, under the condition of uneven feeding, the sludge on each extrusion unit 310 can be ensured to be fully extruded, and thus, the better dewatering effect can be maintained.

According to a preferred embodiment, the first adjusting portion 340 includes a mounting plate 341, a stopper 342, and a third elastic member 343, as shown in fig. 11, 13, 15-18. The mounting plate 341 is used to provide support for the remaining components of the first adjustment part 340, and the mounting plate 341 is also used to be fixedly connected with the housing 100. The third elastic member 343 may be a spring. The mounting plate 341 is provided with a first sliding groove 3411, the stop 342 is slidably mounted in the first sliding groove 3411, and the third elastic member 343 is connected with the stop 342, as shown in fig. 11, 13 and 15-18. Preferably, the first adjusting portion 340 further includes a mounting rod 344, a fixing member 345 and a baffle 346, wherein the mounting rod 344 is connected with the stop 342, the baffle 346 is mounted on the mounting plate 341, the third elastic member 343 is sleeved on the mounting rod 344, and two ends of the third elastic member 343 are limited by the fixing member 345 and the baffle 346, as shown in fig. 16-18.

Further, the first sliding groove 3411 includes a horizontal portion 3411a and an inclined portion 3411b, where a first distance between the horizontal portion 3411a and the upper surface 3111 of the base 311 is smaller than a second distance between the inclined portion 3411b and the upper surface 3111 of the base 311, that is, the horizontal portion 3411a is at a higher position, and the inclined portion 3411b is inclined downward from an end of the horizontal portion 3411a, as shown in fig. 11, 13, 15 to 18. When the stopper 342 is located in the horizontal portion 3411a, the stopper 342 blocks the spacer body 3121, and the third elastic member 343 is in a natural state, as shown in fig. 10 to 13 and 17. When the pushing force of the baffle body 3121 to the baffle plate 342 is greater than the blocking force of the baffle plate body 3121 to the baffle plate 342, the baffle plate body 3121 drives the baffle plate 342 to slide towards the inclined portion 3411b, and when the baffle plate 342 slides towards the inclined portion 3411b, the mounting rod 344 is driven to move, and the third elastic member 343 is in a compressed state, as shown in fig. 18. When the pushing force of the baffle body 3121 to the block 342 disappears, the third elastic member 343 is reset and drives the mounting rod 344 to move reversely, so as to drive the block 342 to slide towards the horizontal portion 3411 a. Fig. 14 and 15 show a schematic view in which the barrier body 3121 pushes the stopper 342 to slide toward the inclined portion 3411b when the pushing force of the barrier body 3121 against the stopper 342 is greater than the blocking force of the stopper 342 against the barrier body 3121.

Specifically, in the initial state, the stopper 342 is located in the horizontal portion 3411a, and the third elastic member 343 is in the natural state, as shown in fig. 17. During the clockwise transfer of the second pressing assembly 300, the diaphragm body 3121 thereon is also transferred in the clockwise direction, and the second elastic member 3123 on the diaphragm body 3121 is in a compressed state when one of the diaphragm bodies 3121 to which the second pressing assembly 300 is transferred is in contact with the stopper 342 and is blocked by the stopper 342. The transfer of the partition body 3121 in the clockwise direction is blocked, and the partition body 3121 on the left side of the partition body 3121 is still transferred in the clockwise direction at a normal speed, so that the distance between the partition body 3121 and the partition body 3121 on the left side thereof is reduced, the sludge located in the extrusion area can be further extruded in the horizontal direction by extruding the two partition bodies 3121, and meanwhile, the volume of the extrusion area formed by the two partition bodies 3121 is reduced, so as to ensure the extrusion effect of the first extrusion surface 220 on the sludge, as shown in fig. 10 to 13, 25 and 27.

As the second extrusion assembly 300 continues to be conveyed in the clockwise direction, the sludge in the extrusion area formed by the two baffle bodies 3121 reaches the extrusion limit, at this time, the sludge in the area will generate a pushing force on the baffle body 3121 blocked by the block 342, the baffle body 3121 transmits the pushing force to the block 342, when the pushing force received by the block 342 is greater than the blocking force of the block 342 on the baffle body 3121, the baffle body 3121 drives the block 342 to slide towards the inclined part 3411b, and the third elastic member 343 is in a compressed state, as shown in fig. 14 to 15. Because the inclined portion 3411b is located at a lower position, the stop 342 can provide a space for avoiding the transmission of the baffle body 3121, and the baffle body 3121 can smoothly pass through the stop 342; while the spacer body 3121 may be restored by the second elastic member 3123. Fig. 17 is a schematic view of the structure of the stopper 342 after being reset.

After the spacer body 3121 passes through the stop block 342, the pushing force of the spacer body 3121 to the stop block 342 disappears, and at this time, the stop block 342 can be reset under the driving of the third elastic member 343, that is, the stop block 342 slides towards the horizontal portion 3411a, so that the stop block 342 can be ready for blocking the next passing spacer body 3121. Therefore, by providing the first adjusting part 340, each extrusion unit 310 can be subjected to the extrusion force in the vertical direction and the extrusion force in the horizontal direction, so that the sludge dewatering equipment can still maintain a good dewatering effect under the condition of uneven feeding.

Referring to fig. 11, two spacer bodies 3121 are provided on each pressing unit 310, and a stopper 342 is used for blocking the right spacer body 3121 on the pressing unit 310, and a relief notch 3121d is provided on the left spacer body 3121 on the pressing unit 310, so that the stopper 342 does not block the spacer body 3121 when the left spacer body 3121 passes the stopper 342.

According to a preferred embodiment, the second press assembly 300 further comprises a mounting groove 350, as shown in fig. 3, 6, 8-10, 12 and 14. The mounting grooves 350 are fixed to both sides of the housing 100, the pressing unit 310 further includes a first mounting shaft 313, the first mounting shaft 313 is slidably mounted in the mounting grooves 350, and the first mounting shaft 313 is further connected to the base 311 and serves to support the base 311. Fig. 8 and 9 show schematic views of the first mounting shaft 313 mounted in the mounting groove 350, and fig. 20 to 25 show schematic views of the first mounting shaft 313 mounted on the base 311.

The first mounting shaft 313 may slide within the mounting groove 350 during the transfer of the second pressing assembly 300. When a pressing action is generated between the first pressing surface 220 and the second pressing surface 320, particularly, when the pressing unit 310 directly acted on by the force application portion 210 is under a pressure greater than that of the remaining pressing units 310 not directly acted on by the force application portion 210, the pressing unit 310 at the position where the force is greater may collapse downward, so that there is a problem in that the pressing is insufficient. In the sludge dewatering apparatus according to the preferred embodiment, the first mounting shaft 313 for supporting the pressing units 310 is mounted through the mounting groove 350, and when the pressing force is applied to the pressing units 310 by the force applying part 210, each pressing unit 310 can be supported through the cooperation of the mounting groove 350 and the first mounting shaft 313, thereby ensuring that sufficient pressing can be maintained between the first pressing surface 220 and the second pressing surface 320 at all times to ensure the dewatering effect.

According to a preferred embodiment, the first pressing assembly 200 further includes a separator pressing part 230, as shown in fig. 3 to 5, 8, 10, 12 and 14. The diaphragm pressing portion 230 is fixed to both sides of the urging portion 210 and the first pressing surface 220. The two ends of the partition body 3121 are provided with first protrusions 3121a, and the first protrusions 3121a protrude from the upper surface of the partition body 3121. Preferably, the surface of the first protruding portion 3121a is a planar structure, and a chamfer is provided at a corner of the first protruding portion 3121 a. Fig. 19 to 28 each show a schematic structural view of the first protruding portion 3121 a. Preferably, the hardness at the first protruding portion 3121a may be greater than the hardness of the spacer body 3121. When the first pressing surface 220 presses against the second pressing surface 320, the spacer pressing portion 230 contacts the first protrusion 3121a and compresses the spacer body 3121 downward, so that the force between the first pressing surface 220 and the spacer body 3121 can be reduced, thereby facilitating protection of the first pressing surface 220 and the spacer body 3121. Fig. 3 and 4 show schematic views of the separator pressing portion 230 contacting the first protruding portion 3121 a.

Specifically, in order to ensure the sludge treatment capacity, the partition plate body 3121 is generally formed into a sheet shape, so as to meet the separation effect thereof, and in the extrusion process of the first extrusion surface 220 and the second extrusion surface 320, since the partition plate body 3121 is thinner, the upper surface of the partition plate body 3121 is formed into a sharp blade, and the acting force of the force application portion 210 is larger, when the first extrusion surface 220 extrudes the sludge, the partition plate body 3121 cuts the first extrusion surface 220, thereby influencing the service life of the first extrusion surface 220; meanwhile, the pressing force of the first pressing surface 220 directly acts on the spacer body 3121, so that the spacer body 3121 also has a potential risk of being flattened.

According to a preferred embodiment, the end of the separator pressing part 230 adjacent to the discharge port 130 is further provided with a second protrusion 231, and the second protrusion 231 is in contact with the second pressing surface 320, as shown in fig. 3 and 5. The contact of the second protrusion 231 with the second pressing surface 320 may mean complete contact between the second protrusion 231 and the second pressing surface 320; or a gap where the distance between the second convex portion 231 and the second pressing surface 320 is extremely small, such as a gap smaller than 2mm, in the case where no pressing force is applied. Specifically, as shown in fig. 5, the second protrusion 231 has a larger width than the rest of the separator pressing part 230, and the separator body 3121 located therein can be always flattened (as shown in fig. 5, the separator body 3121 is compressed to be flush with the second pressing surface 320) due to the contact of the second protrusion 231 with the second pressing surface 320, so that interference between the separator body 3121 at the discharge port 130 and the scraper assembly 400 at the discharge port 130 can be avoided, and it is ensured that the scraper assembly 400 at the discharge port 130 can scrape mud cakes adhered to the first pressing surface 220 and/or the second pressing surface 320.

According to a preferred embodiment, the housing 100 is provided with a second chute 140, and the force application portion 210 is slidably mounted in the second chute 140, as shown in fig. 2. The plurality of urging portions 210 are hinged to the housing 100 by hinge plates 150 as shown in fig. 1, 3 and 6. The first pressing assembly 200 further includes a second adjusting portion 240, and the second adjusting portion 240 is configured to adjust a distance between the first pressing surface 220 and the second pressing surface 320. When the sludge enters the extrusion area 330, the force application part 210 applies pressure to the first extrusion surface 220 by its own weight, when the sludge feeding amount is small, the distance between the first extrusion surface 220 and the second extrusion surface 320 is also small, and when the sludge feeding amount is increased, the distance between the first extrusion surface 220 and the second extrusion surface 320 is also increased, and by providing the second adjusting part 240, the force application part 210 can be assisted to move upwards, so that the first extrusion surface 220 can better adapt to the change of the sludge feeding amount.

Preferably, the second adjusting part 240 is provided with a fourth elastic member 241. The fourth elastic member 241 may be a spring. The second adjusting portion 240 further includes a second support post 242, where the second support post 242 is connected to the force applying portion 210, and the fourth elastic member 241 is sleeved on the second support post 242, as shown in fig. 3. When the force application portion 210 slides downward by the force of gravity, the fourth elastic member 241 is in an extended state (that is, when the force application portion 210 is acted on by the force of gravity only, that is, when there is no sludge in the pressing region 330), the fourth elastic member 241 is in an extended state). When the force application portion 210 receives a force opposite to the gravity direction, the fourth elastic member 241 is in a reset state and drives the force application portion 210 to slide upwards. Specifically, the force applying portion 210 is further subjected to a force opposite to the gravity direction, that is, a pressing force of the sludge, when the feeding amount of the sludge is larger, the pressing force is larger, and at this time, the force applying portion 210 can slide upwards and lift under the action of the pressing force of the sludge, so that the force applying portion 210 can better adapt to the change of the feeding amount of the sludge through the auxiliary action of the fourth elastic member 241.

According to a preferred embodiment, the sludge dewatering apparatus further comprises a scraper assembly 400, the scraper assembly 400 being located at the discharge opening 130, as shown in fig. 6 and 7. Doctor assembly 400 includes a first doctor 410 and a second doctor 420 as shown in fig. 6 and 7. The first scraper 410 is located at the first pressing surface 220, and the first scraper 410 is used for scraping the sludge on the first pressing surface 220. The second scraper 420 is located at the second pressing surface 320, and the second scraper 420 is used for scraping the sludge on the second pressing surface 320. In the process of extrusion dehydration, as moisture in the sludge cannot be thoroughly removed, the sludge has a certain viscosity, and part of the sludge is adhered to the first extrusion surface 220 and possibly also adhered to the second extrusion surface 320, and if the sludge on the first extrusion surface 220 and the second extrusion surface 320 is not removed, the subsequent sludge treatment capacity and the sludge dehydration effect of the sludge dehydration equipment are affected. In the sludge dewatering device according to the preferred embodiment of the present invention, by providing a scraper at the first pressing surface 220 and the second pressing surface 320, respectively, sludge on the first pressing surface 220 can be scraped off, and sludge on the second pressing surface 320 can be scraped off, so that sludge throughput and sludge dewatering effect of the sludge dewatering device can be ensured.

According to a preferred embodiment, the second scraper 420 comprises a scraping portion 421 and a shielding portion 422, the scraping portion 421 being rotatably connected to the shielding portion 422, as shown in fig. 7. By the provision of the shielding part 422, not only can the mud cake be prevented from falling into the gap between the housing 100 and the second pressing assembly 300, but also the mud cake can be guided to the next station. Preferably, the scraping portion 421 and the shielding portion 422 are rotatably connected by a torsion spring 425, as shown in fig. 7. In the sludge dewatering device according to the preferred embodiment, the scraping portion 421 is rotatably connected to the shielding portion 422, and when the shielding portion 422 is pressed by the mud cake, the scraping portion 421 is tilted upward; when the pressing of the mud cake against the shielding portion 422 disappears, the scraping portion 421 is restored to be in contact with the second pressing surface 320. The scraping portion 421 and the shielding portion 422 are rotatably connected by the torsion spring 425, so that the scraping portion 421 is always in a state of being attached to the second pressing surface 320, and the cleaning effect of the scraping portion on mud cakes is ensured.

Preferably, a first limiting portion 423 is disposed below the scraping portion 421, and the first limiting portion 423 is used to limit a rotation angle of the scraping portion 421, as shown in fig. 7. A second limiting portion 424 is disposed below the shielding portion 422, and the second limiting portion 424 is used for limiting a rotation angle of the shielding portion 422. Through the effect of first spacing portion 423 and second spacing portion 424, can restrict the turned angle of striking off portion 421 and shielding portion 422 to can avoid striking off portion 421 and shielding portion 422 to carry out the large-angle rotation for a long time, lead to its ability of resetting to receive the influence, thereby can't ensure striking off portion 421 be in the problem of laminating the state mutually with second extrusion face 320 all the time.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention.

Claims (7)

1. A sludge dewatering device is characterized by comprising a shell (100), a first extrusion assembly (200) and a second extrusion assembly (300), wherein,

The shell (100) is provided with a feed inlet (110), a processing space (120) and a discharge outlet (130), the feed inlet (110) is communicated with the processing space (120), the processing space (120) is also communicated with the discharge outlet (130), and the first extrusion component (200) and the second extrusion component (300) are arranged in the processing space (120) in a transmission way;

The first pressing assembly (200) comprises a force application part (210) and a first pressing surface (220), wherein the force application part (210) is used for applying pressure to the first pressing surface (220);

The second pressing assembly (300) comprises a plurality of pressing units (310), the pressing units (310) comprise a base body (311) and elastic partition plates (312), the elastic partition plates (312) are arranged on one side of the base body (311) or on two sides of the base body (311) in a telescopic manner in the vertical direction, two adjacent pressing units (310) are separated by the elastic partition plates (312), the upper surface (3111) of the base body (311) of the pressing unit (310) is formed into a second pressing surface (320), a region between the second pressing surface (320) and the first pressing surface (220) is formed into a pressing region (330), and

The elastic partition plate (312) can adjust the height of the elastic partition plate (312) extending out of the upper surface (3111) of the base body (311) based on the amount of sludge in the pressing region (330);

The elastic baffle plate (312) comprises a baffle plate body (3121) and first elastic pieces (3122), wherein the baffle plate body (3121) is movably arranged on one side of the base body (311) or on two sides of the base body (311), the first elastic pieces (3122) are arranged on the base body (311), and when the baffle plate body (3121) is subjected to pressure in the vertical direction, the baffle plate body (3121) moves downwards and drives the first elastic pieces (3122) to be in a compressed state; when the pressure of the baffle body (3121) in the vertical direction is relieved, the first elastic piece (3122) is in a straightening state and drives the baffle body (3121) to reset;

the elastic partition (312) further comprises a second elastic member (3123), the second elastic member (3123) is mounted on the partition body (3121), the second extrusion assembly (300) further comprises a first adjustment portion (340), the first adjustment portion (340) is fixed on the housing (100), and when the first adjustment portion (340) blocks the partition body (3121), a distance between the partition body (3121) and an adjacent partition body (3121) is reduced, and the second elastic member (3123) is in a compressed state; when the first adjusting part (340) releases the blocking of the baffle body (3121), the second elastic piece (3123) is in a straightened state and drives the baffle body (3121) to reset;

The first adjusting part (340) comprises a mounting plate (341), a block (342) and a third elastic piece (343), wherein the mounting plate (341) is fixed on the shell (100), a first sliding groove (3411) is arranged on the mounting plate (341), the first sliding groove (3411) comprises a horizontal part (3411 a) and an inclined part (3411 b), a first distance between the horizontal part (3411 a) and the upper surface (3111) of the base body (311) is smaller than a second distance between the inclined part (3411 b) and the upper surface (3111) of the base body (311), the block (342) is slidably arranged in the first sliding groove (3411), the third elastic piece (343) is connected with the block (342),

When the block (342) is positioned in the horizontal part (3411 a), the block (342) blocks the partition plate body (3121) and the third elastic member (343) is in a natural state,

When the pushing force of the baffle plate body (3121) to the baffle plate (342) is larger than the blocking force of the baffle plate body (3121) to the baffle plate body (3121), the baffle plate body (3121) drives the baffle plate (342) to slide towards the inclined part (3411 b) and the third elastic member (343) is in a compressed state,

When the pushing force of the baffle plate body 3121 to the stop block 342 disappears, the third elastic member 343 is reset and drives the stop block 342 to slide towards the horizontal part 3411 a.

2. The sludge dewatering equipment according to claim 1, characterized in that the second press assembly (300) further comprises mounting slots (350), the mounting slots (350) being fixed to both sides of the housing (100), the press unit (310) further comprises a first mounting shaft (313), the first mounting shaft (313) being slidably mounted in the mounting slots (350), and the first mounting shaft (313) being further connected with the base body (311) and being adapted to support the base body (311).

3. The sludge dewatering equipment according to claim 1, wherein the first pressing assembly (200) further comprises a partition pressing portion (230), the partition pressing portion (230) being fixed to both sides of the force applying portion (210) and the first pressing surface (220),

The separator comprises a separator body (3121), wherein first protruding parts (3121 a) are arranged at two ends of the separator body (3121), the first protruding parts (3121 a) protrude from the upper surface of the separator body (3121), and when the force application part (210) applies pressure to the first extrusion surface (220), the separator extrusion part (230) is in contact with the first protruding parts (3121 a) and applies pressure in the vertical direction to the separator body (3121).

4. A sludge dewatering apparatus as claimed in claim 3, wherein the end of the separator pressing portion (230) adjacent to the discharge port (130) is further provided with a second protruding portion (231), and the second protruding portion (231) is in contact with the second pressing surface (320).

5. The sludge dewatering equipment according to claim 1, wherein a second chute (140) is provided on the housing (100), the force application portion (210) is slidably mounted in the second chute (140), the first pressing assembly (200) further comprises a second adjustment portion (240), the second adjustment portion (240) is used for adjusting the distance between the first pressing surface (220) and the second pressing surface (320),

The second adjusting part (240) is provided with a fourth elastic member (241), and

When the force application part (210) slides downwards under the action of gravity, the fourth elastic piece (241) is in an extension state;

When the force application part (210) is also acted by a force opposite to the gravity direction, the fourth elastic piece (241) is in a reset state and drives the force application part (210) to slide upwards.

6. The sludge dewatering equipment as claimed in any one of claims 1 to 5, further comprising a doctor assembly (400), the doctor assembly (400) being located at the discharge outlet (130), and

The doctor assembly (400) includes a first doctor (410) and a second doctor (420),

The first scraper (410) is positioned at the first extrusion surface (220), the first scraper (410) is used for scraping the sludge on the first extrusion surface (220),

The second scraper (420) is located at the second extrusion surface (320), and the second scraper (420) is used for scraping sludge on the second extrusion surface (320).

7. The sludge dewatering equipment as claimed in claim 6, characterized in that the second scraper (420) comprises a scraping portion (421) and a shielding portion (422), the scraping portion (421) being rotatably connected with the shielding portion (422), and

A first limiting part (423) is arranged below the scraping part (421), the first limiting part (423) is used for limiting the rotation angle of the scraping part (421),

A second limiting part (424) is arranged below the shielding part (422), and the second limiting part (424) is used for limiting the rotation angle of the shielding part (422).