CN113879776B - Scraper conveyor, scraper and rolling body - Google Patents

Abstract

The application relates to the technical field of material conveying devices, in particular to a scraper conveyor, a scraper and rolling bodies. The scraper conveyor comprises a material conveying groove, an annular chain, a scraper body, rolling bodies and a spraying device. The annular chain can circularly move relative to the material conveying groove; the scraper body is arranged on the annular chain, a fixing hole and a sewage draining hole which are communicated with each other are formed in the scraper body, and the fixing hole and the sewage draining hole penetrate through the scraper body; the rolling body is arranged in the fixed hole, the rolling body comprises a shell and a ball, a mounting cavity is formed in the shell, the ball is arranged in the mounting cavity, part of the ball extends out of the bottom side of the shell, and the shell is provided with a sewage outlet hole communicated with the mounting cavity and the sewage outlet hole; the spraying device is arranged at the machine head and/or the machine tail, and when the scraper body turns over at the machine head or the machine tail, the spraying device can spray towards the sewage draining hole of the scraper body. The application can utilize water flow to clean the scraper body and the rolling bodies, reduce the balls to be clamped in the mounting cavity, and improve the rolling performance of the balls.

Description

Scraper conveyor, scraper and rolling body

Technical Field

The application relates to the technical field of material conveying devices, in particular to a scraper conveyor, a scraper and rolling bodies.

Background

A scraper conveyor is a conveyor device for transporting coal and materials, and generally includes an endless chain and a scraper mounted on the endless chain, where the endless chain can drive the scraper to move on a material conveying trough of the scraper conveyor. For reducing the friction loss of scraper blade and material conveyer trough, the bottom of current scraper blade is equipped with the rolling element, and the rolling element includes the shell and can be at the rolling ball in the shell, and the ball has the bottom side that partially stretches out the shell to can roll on the material conveyer trough, in order to change the sliding friction between scraper blade and the material conveyer trough into rolling friction, and then reduce the running resistance of scraper blade, and reduce wearing and tearing.

But the scraper conveyor is usually used in the scene that environmental cleanliness is relatively poor such as colliery, and impurity such as buggy, mud generally have on the material conveying groove, and the scraper blade is in the operation in-process, and impurity gets into in the shell easily. After long-time use, the impurity accumulated in the shell can increase the rolling resistance of the balls, and even the balls can be clamped in the shell to be difficult to rotate, so that the normal use of the equipment is affected.

Disclosure of Invention

In order to solve the technical problems, the application provides the scraper conveyor, the scraper and the rolling bodies, which can clean the scraper body and the rolling bodies by utilizing water flow, reduce the clamping of balls in the mounting cavity, improve the rolling performance of the balls and effectively solve the problems in the prior art.

In order to solve the problems, the application provides a scraper conveyor which comprises a material conveying groove, an annular chain, a scraper body, rolling bodies and a spraying device. The annular chain can circularly move relative to the material conveying groove; the scraper body is arranged on the annular chain, a fixing hole and a sewage draining hole which are communicated with each other are formed in the scraper body, and the fixing hole and the sewage draining hole penetrate through the scraper body; the rolling body is arranged in the fixed hole, the rolling body comprises a shell and a ball, a mounting cavity is formed in the shell, the ball is arranged in the mounting cavity, part of the ball extends out of the bottom side of the shell, and the shell is provided with a sewage outlet hole communicated with the mounting cavity and the sewage outlet hole; the spraying device is arranged at the machine head and/or the machine tail, and when the scraper body turns over at the machine head or the machine tail, the spraying device can spray towards the sewage draining hole of the scraper body.

Further, the scraper conveyor further comprises a separation plate, and the separation plate can form a sewage disposal channel communicated with the sewage disposal hole and the outside.

Further, the division board is the blowdown lid, and the blowdown lid has the link that links to each other with the scraper blade body to rotate and open or close the blowdown hole, and when the scraper blade body upset down, the blowdown lid can rotate under the effect of gravity and open the blowdown hole, in order to form the blowdown passageway.

Further, the drain cover is provided with a water inlet hole communicated with the drain hole.

Further, the division plate is a sewage filter screen, the sewage filter screen is arranged in the sewage hole, meshes of the sewage filter screen form a sewage channel, and the sewage filter screen is separated from the sewage hole and the outer side of the scraper body.

Further, the edge of the pollution discharge filter screen forms an annular convex rib, and the inner wall of the pollution discharge hole forms an annular groove for interference insertion of the annular convex rib.

Further, the distance between the top surface of the blowdown filter screen and the top edge of the blowdown hole is not less than 3mm.

Further, the wear-resistant sealing ring is arranged at the bottom side of the installation cavity, and the wear-resistant sealing ring is clamped by the wall of the installation cavity and the balls.

Further, the spraying device comprises a water outlet pipe and a water spraying head arranged on the water outlet pipe, and the water spraying head faces the sewage draining hole.

The application also provides a scraper which comprises a scraper body and rolling bodies. The scraper body is internally provided with a fixing hole and a drain hole which are communicated with each other, and the fixing hole and the drain hole penetrate through the scraper body; the rolling body is installed in the fixed orifices, and the rolling body includes shell and ball, and the inside installation cavity that forms of shell, ball install in the installation cavity, and the ball has the bottom side that stretches out the shell in part, and the shell has the dirt outlet hole of intercommunication installation cavity and dirt discharging hole.

The application also provides a rolling body which comprises a shell, a ball and a pollution discharge filter screen. The inside of the shell is provided with a mounting cavity, and the shell is provided with a pollution discharge hole communicated with the mounting cavity and the outside; the ball is arranged in the mounting cavity, and part of the ball extends out of the bottom side of the shell; the blowdown filter screen is installed in the shell, and the blowdown filter screen separates out dirty hole and the outside of shell.

The application has the beneficial effects that the scraper body starts to turn over when moving to the machine head or the machine tail, and the spraying device can spray the sewage draining hole of the scraper body. The sprayed water flow can dilute impurities in the scraper body and the rolling body, so that the impurities become fluid, and the fluid impurities are easier to discharge from the sewage draining hole. Moreover, under the effect of water pressure, the impurity in scraper blade body and the rolling body can be washed out by rivers, reduces impurity card at scraper blade body and rolling body. After the scraper body and the rolling bodies are cleaned by water flow, the balls can be reduced to be clamped in the mounting cavity, the rolling performance of the balls is improved, and the service life is prolonged. In addition, after cleaning, a small amount of moisture can be reserved on the scraper body and the rolling body, and when materials are conveyed, impurities entering the installation cavity are mixed with the moisture, so that the fluidity of the impurities can be improved, and the resistance of the impurities to the rolling balls is reduced. The application effectively solves the problems existing in the prior art.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

fig. 1 is a schematic view showing a partial perspective view of a scraper conveyor according to an embodiment of the present application.

FIG. 2 is a schematic cross-sectional view of a portion of a scraper conveyor according to an embodiment of the present application.

Fig. 3 is a schematic view of a scraper according to an embodiment of the application.

Fig. 4 is a schematic cross-sectional view of a portion of a blade body according to an embodiment of the application.

FIG. 5 is a schematic partial cross-sectional view of a screed according to an embodiment of the present application.

Fig. 6 is a schematic top view of a portion of a screed according to an embodiment of the present application.

Fig. 7 is a schematic view of a structure of a drain cover in a closed state according to an embodiment of the application.

Fig. 8 is a schematic view of a structure in which a drain cover is opened according to an embodiment of the application.

Fig. 9 is a schematic top view of a portion of a screed according to another embodiment of the present application.

Fig. 10 is a schematic partial cross-sectional view of a screed according to another embodiment of the present application.

Fig. 11 is a schematic view of a rolling element according to another embodiment of the present application.

Wherein: 1. a material conveying groove; 2. an endless chain; 3. a scraper body; 31. a fixing hole; 32. a blow-down hole; 4. a rolling element; 41. a housing; 411. a mounting cavity; 412. a dirt outlet hole; 42. a ball; 5. a spraying device; 51. a water outlet pipe; 511. a water spray head; 6. a drain cover; 61. a connection end; 62. a water inlet hole; 7. a pollution discharge filter screen; 8. and (5) a wear-resistant sealing ring.

Detailed Description

In order to more clearly illustrate the general inventive concept, reference will be made in the following detailed description, by way of example, to the accompanying drawings.

It should be noted that in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than as described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.

In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. However, it is noted that a direct connection indicates that two bodies connected together do not form a connection relationship by an excessive structure, but are connected to form a whole by a connection structure. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the present application, as shown in fig. 1 to 10, there is provided a scraper conveyor comprising a material conveying groove 1, an endless chain 2, a scraper body 3, rolling bodies 4, and a shower device 5. The annular chain 2 can move circularly relative to the material conveying groove 1; the scraper body 3 is arranged on the annular chain 2, a fixing hole 31 and a pollution discharge hole 32 which are mutually communicated are formed in the scraper body 3, and the fixing hole 31 and the pollution discharge hole 32 penetrate through the scraper body 3; the rolling element 4 is arranged in the fixed hole 31, the rolling element 4 comprises a shell 41 and a ball 42, an installation cavity 411 is formed in the shell 41, the ball 42 is arranged in the installation cavity 411, part of the ball 42 extends out of the bottom side of the shell 41, and the shell 41 is provided with a pollution discharge hole 412 which is communicated with the installation cavity 411 and the pollution discharge hole 32; the spraying device 5 is arranged at the machine head and/or the machine tail, and when the scraper body 3 turns over at the machine head or the machine tail, the spraying device 5 can spray towards the sewage draining hole 32 of the scraper body 3.

According to the scraper conveyor, when the scraper body 3 moves to the machine head or the machine tail, the scraper body starts to turn over, and the spraying device 5 can spray the drain hole 32 of the scraper body 3. The sprayed water flows into the installation cavity 411 through the sewage drain hole 32 and the sewage outlet hole 412 to dilute impurities in the scraper body 3 and the rolling bodies 4, so that the impurities become fluid, and the fluid impurities are more easily discharged from the sewage drain hole 32. Especially when the scraper body 3 is turned downward, the diluted impurities can be discharged under the action of gravity, and the scraper body 3 can vibrate in the operation process, so that the diluted impurities are more easily discharged from the drain hole 32 under the action of vibration.

In addition, under the action of water pressure, softer impurities are easily broken into finer particles by the impact force of water flow, are not easily blocked in the installation cavity 411, the pollution discharge hole 412 and the pollution discharge hole 32, and are more easily discharged. Moreover, the impact force of the water flow can generate thrust to impurities, and the impurities can be discharged under the thrust, so that the impurities are further reduced from being blocked in the scraper body 3 and the rolling bodies 4.

After the scraper body 3 and the rolling bodies 4 are cleaned by water flow, the phenomenon that the balls 42 are clamped in the mounting cavity 411 can be reduced, the rolling performance of the balls 42 is improved, and the service life is prolonged. In addition, after cleaning, a small amount of moisture can be reserved on the scraper body 3 and the rolling bodies 4, and impurities entering the installation cavity 411 are mixed with the moisture during material conveying, so that the fluidity of the impurities can be improved, and the resistance of the impurities to the balls 42 is reduced. Particularly in a coal mine, after the coal slime entering the installation cavity 411 is mixed with water, the ball 42 can be lubricated, and the rolling performance of the ball 42 is improved.

In addition, the water flow sprayed by the spraying device 5 can play an auxiliary cooling role on the balls 42.

It should be noted that, in the present application, the state where the balls 42 partially protrude from the bottom side of the housing 41 is based on the state where the balls 42 face downward with respect to the squeegee body 3, it is understood that when the balls 42 face upward with respect to the squeegee body 3, the balls 42 partially protrude from the top side of the housing 41. In the present application, turning the squeegee body 3 downward means that the squeegee body 3 is located below the balls 42 after the squeegee body 3 is turned.

In a preferred embodiment, further specifically, the scraper conveyor further comprises a partition plate capable of forming a trapway communicating the trapway 32 with the outside.

The scraper blade body 3 can separate big granule material and get into in the installation cavity 411 at the in-process of carrying the material, reduces big granule material card and takes place at dirty hole 412 or installation cavity 411's phenomenon, can reduce the washing degree of difficulty moreover. In addition, when the scraper blade body 3 moves to aircraft nose or tail, the rivers that spray set 5 sprayed can get into the installation cavity 411 by blowdown passageway, blowdown hole 32, play dirty hole 412, and impurity mobility after diluting improves, can be discharged by the blowdown passageway that the division board formed.

In the form of a partition plate, in a further specific embodiment, the partition plate is a drain cover 6, and the drain cover 6 has a connection end 61 connected to the scraper body 3 to rotatably open or close the drain hole 32, and when the scraper body 3 is turned upside down, the drain cover 6 can rotate to open the drain hole 32 under the action of gravity to form the drain passage.

As shown in fig. 6 to 8, the scraper body 3 closes the drain hole 32 during the material conveying process, so that the entry of impurities from the drain hole 32 into the installation cavity 411 can be reduced. When the scraper body 3 runs to the machine head or the machine tail, on one hand, the water flow sprayed by the spraying device 5 can flush the sewage draining cover 6 to open the sewage draining hole 32, and on the other hand, the sewage draining cover 6 can automatically open the sewage draining hole 32 through rotation under the action of self gravity and under the pushing of the gravity of impurities. After the drain cover 6 is opened, water flows into the drain hole 32 to dilute the scraper body 3 and the rolling bodies 4. When the scraper body 3 turns upwards again, the sewage draining cover 6 can rotate under the action of self gravity to automatically close the sewage draining hole 32.

When the drain cover 6 is opened by rotation, the impurities above the drain cover can be pushed down. Especially under the condition that the blowdown cover 6 is arranged in the blowdown hole 32, when the blowdown cover 6 rotates to be opened, impurities in the blowdown hole 32 can be pushed down, and the phenomenon that the impurities are clamped in the blowdown hole 32 is reduced.

It should be noted that, in this embodiment, the connection manner of the sewage draining cover 6 and the scraper body 3 is not limited. In one embodiment, the attachment end 61 of the trapper 6 is hinged to the scraper body 3. In another embodiment, the connection end 61 of the drain cover 6 and the scraper body 3 are connected by rubber or other elastic structure, and the drain cover 6 can rotate relative to the scraper body 3 by elastic deformation of the elastic structure to open or close the drain hole 32.

It should be further noted that, in this embodiment, the drain cover 6 closes the drain hole 32, including a case where the drain cover 6 covers the entire drain hole 32, and a case where the drain cover 6 covers a part of the drain hole 32.

With respect to the structure of the drain cover 6, in the embodiment shown in fig. 7, further specifically, the drain cover 6 is provided with a water inlet hole 62 communicating with the drain hole 32. When the trapway 6 is provided with the inlet opening 62, the inlet opening 62 forms part of the trapway. If the sewage draining cover 6 is blocked by impurities and is difficult to automatically open, water flow of the spraying device 5 can enter the sewage draining hole 32 through the water inlet hole 62, and diluted impurities can be discharged through the water inlet hole 62. Moreover, when the scraper body 3 is turned downward, the water inside the scraper body can increase the thrust to the sewage disposal cover 6, which is beneficial to the opening of the sewage disposal cover 6, so as to improve the efficiency of discharging impurities.

In an alternative embodiment, the scraper conveyor further comprises a drain filter screen 7, wherein the drain filter screen 7 is arranged in the drain hole 32, the mesh of the drain filter screen 7 forms a drain channel, and the drain filter screen 7 separates the drain hole 412 from the outer side of the scraper body 3. As shown in fig. 9 and 10, the dirt discharging filter screen 7 can block large particle materials from entering the installation cavity 411 in the process of conveying the materials by the scraper body 3. When the scraper body 3 is turned over at the machine head or the machine tail, water flow sprayed by the spraying device 5 can enter the installation cavity 411 through the pollution discharge filter screen 7 so as to dilute impurities, and the diluted impurities can be discharged through the pollution discharge filter screen 7.

It should be noted that, in this embodiment, the installation manner of the drain filter screen 7 is not limited, and in one embodiment, the drain filter screen 7 is inserted into the drain hole 32 in an interference manner.

For the installation of the blowdown filter 7, it is further specified that the distance between the top surface of the blowdown filter 7 and the top edge of the blowdown hole 32 is not less than 3mm. When the material falls on the scraper blade body 3, in the big material is difficult for getting into blowdown hole 32, can reduce big material direct impact blowdown filter screen 7, reduce blowdown filter screen 7 damage. In addition, when the blowdown filter screen 7 is sprayed, part of the rebound water flow is limited by the wall of the blowdown hole 32 and can flow to the blowdown filter screen 7 again, and then flows into the installation cavity 411 to dilute impurities, so that the effect of flushing the impurities is improved. Moreover, the sewage filter screen 7 is closer to the sewage outlet 412, so that the stroke of impurities flowing out of the sewage filter screen 7 along with water flow can be shortened, thereby reducing impurity blockage and improving sewage efficiency.

In a preferred embodiment, further specifically, the bottom side of the mounting cavity 411 is provided with a wear-resistant sealing ring 8, and the wall of the mounting cavity 411 and the balls 42 clamp the wear-resistant sealing ring 8. As shown in fig. 7, the wear-resistant sealing ring 8 can reduce the gap between the ball 42 and the wall of the installation cavity 411, improve the sealing performance of the installation cavity 411, and reduce the entry of impurities into the installation cavity 411. Furthermore, the wear-resistant sealing ring 8 can scrape impurities attached to the surface of the ball 42, so that the impurities can be reduced from entering the mounting cavity 411 along with the rolling of the ball 42.

With respect to the configuration of the spray device 5, in a preferred embodiment, further specifically, the spray device 5 includes a water outlet pipe 51 and a spray head 511 disposed on the water outlet pipe 51, the spray head 511 facing the drain hole 32. As shown in fig. 2, the water flow can spray the drain hole 32 of the squeegee body 3 by the water spray head 511, thereby cleaning the inside of the squeegee body 3 and the rolling bodies 4 of impurities.

As shown in fig. 3 to 10, the present application further provides a scraper, which comprises a scraper body 3 and rolling bodies 4. The scraper body 3 is internally provided with a fixing hole 31 and a pollution discharge hole 32 which are communicated with each other, and the fixing hole 31 and the pollution discharge hole 32 penetrate through the scraper body 3; the rolling element 4 is mounted in the fixed hole 31, the rolling element 4 includes a housing 41 and a ball 42, a mounting cavity 411 is formed inside the housing 41, the ball 42 is mounted in the mounting cavity 411, the ball 42 partially extends out of the bottom side of the housing 41, and the housing 41 has a dirt outlet 412 communicating the mounting cavity 411 with the dirt outlet 32.

When the scraper of the application turns downwards in the operation process, impurities in the installation cavity 411 can be discharged through the sewage outlet 412 and the sewage discharging hole 32 under the action of gravity and the promotion of the vibration of the scraper, so that the accumulation of the impurities in the installation cavity 411 is reduced. The scraper can be applied to the material conveyor, and the scraper starts to turn over when moving to the machine head or the machine tail, and the spraying device 5 can spray the drain hole 32 of the scraper body 3.

The sprayed water flows into the installation cavity 411 through the sewage drain hole 32 and the sewage outlet hole 412 to dilute impurities in the scraper body 3 and the rolling bodies 4, so that the impurities become fluid, and the fluid impurities are more easily discharged from the sewage drain hole 32. Especially when the scraper body 3 is turned downward, the diluted impurities can be discharged under the action of gravity, and the scraper body 3 can vibrate in the operation process, so that the diluted impurities are more easily discharged from the drain hole 32 under the action of vibration.

In addition, under the action of water pressure, softer impurities are easily broken into finer particles by the impact force of water flow, are not easily blocked in the installation cavity 411, the pollution discharge hole 412 and the pollution discharge hole 32, and are more easily discharged. Moreover, the impact force of the water flow can generate thrust to impurities, and the impurities can be discharged under the thrust, so that the impurities are further reduced from being blocked in the scraper body 3 and the rolling bodies 4.

After the scraper body 3 and the rolling bodies 4 are cleaned by water flow, the phenomenon that the balls 42 are clamped in the mounting cavity 411 can be reduced, the rolling performance of the balls 42 is improved, and the service life is prolonged. In addition, after cleaning, a small amount of moisture can be reserved on the scraper body 3 and the rolling bodies 4, and impurities entering the installation cavity 411 are mixed with the moisture during material conveying, so that the fluidity of the impurities can be improved, and the resistance of the impurities to the balls 42 is reduced. Particularly in a coal mine, after the coal slime entering the installation cavity 411 is mixed with water, the ball 42 can be lubricated, and the rolling performance of the ball 42 is improved.

In addition, the water flow sprayed by the spraying device 5 can play an auxiliary cooling role on the balls 42.

As shown in fig. 11, the application also provides a rolling element 4, which comprises a shell 41, a ball 42 and a pollution discharge filter screen 7. The inside of the shell 41 is provided with a mounting cavity 411, and the shell 41 is provided with a pollution outlet 412 which is communicated with the mounting cavity 411 and the outside; the balls 42 are mounted in the mounting cavity 411, and the balls 42 have portions protruding from the bottom side of the housing 41; the drain filter 7 is mounted to the housing 41, and the drain filter 7 separates the drain hole 412 from the outside of the housing 41.

During operation of the rolling element 4, the pollution discharge filter screen 7 can prevent large particle materials from entering the installation cavity 411. When the rolling bodies 4 turn downwards, impurities in the installation cavity 411 can be discharged by the pollution discharge filter screen 7, and the impurities are reduced to be accumulated in the installation cavity 411. The rolling body 4 may be mounted on the scraper body 3 and may be applied to the scraper conveyor, and the water flow sprayed by the spraying device 5 may enter the mounting cavity 411 through the pollution discharge filter screen 7 to dilute impurities, and the diluted impurities may be discharged through the pollution discharge filter screen 7.

In addition, during assembly, the pollution discharge filter screen 7 can be mounted on the shell 41, and then the assembled rolling bodies 4 can be mounted in the fixing holes 31 of the scraper body 3, so that the operation is easy.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.

The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.

Claims (9)

1. A scraper conveyor, comprising:

a material conveying groove;

the annular chain can move circularly relative to the material conveying groove;

the scraper body is arranged on the annular chain, a fixing hole and a sewage draining hole which are communicated with each other are formed in the scraper body, and the fixing hole and the sewage draining hole penetrate through the scraper body;

the rolling body is arranged in the fixing hole and comprises a shell and a ball, an installation cavity is formed in the shell, the ball is arranged in the installation cavity, part of the ball extends out of the bottom side of the shell, and the shell is provided with a pollution discharge hole communicated with the installation cavity and the pollution discharge hole;

the spraying device is arranged at the machine head and/or the machine tail, and when the scraper body is overturned at the machine head or the machine tail, the spraying device can spray towards the sewage draining hole of the scraper body.

2. The scraper conveyor of claim 1, further comprising a divider plate configured to form a trapway communicating the trapway with the outside.

3. The scraper conveyor of claim 2, wherein the divider plate is a drain cover having a connecting end connected to the scraper body to rotatably open or close the drain hole, and wherein the drain cover is capable of rotatably opening the drain hole under the action of gravity to form the drain channel when the scraper body is turned upside down.

4. A scraper conveyor according to claim 3, wherein the drain cover is provided with a water inlet opening communicating with the drain hole.

5. The scraper conveyor of claim 2, wherein the divider plate is a blowdown filter screen mounted to the blowdown port, the mesh of the blowdown filter screen forms the blowdown channel, and the blowdown filter screen separates the blowdown port from the outer side of the scraper body.

6. The scraper conveyor of claim 5, wherein a distance between a top surface of the blowdown screen and a top edge of the blowdown aperture is no less than 3mm.

7. The scraper conveyor of claim 1, wherein a wear-resistant seal ring is mounted to a bottom side of the mounting cavity, and wherein the wear-resistant seal ring is clamped by a cavity wall of the mounting cavity and the balls.

8. The scraper conveyor of claim 1, wherein the spray device comprises a water outlet pipe and a sprinkler head disposed on the water outlet pipe, the sprinkler head facing the blowdown port.

9. A screed comprising:

the scraper body is internally provided with a fixing hole and a sewage draining hole which are communicated with each other, and the fixing hole and the sewage draining hole penetrate through the scraper body;

the rolling body is arranged in the fixing hole and comprises a shell and a ball, an installation cavity is formed in the shell, the ball is arranged in the installation cavity, part of the ball extends out of the bottom side of the shell, and the shell is provided with a pollution discharge hole communicated with the installation cavity and the pollution discharge hole;

when the scraper blade overturns downwards in the operation process, impurities in the installation cavity can be discharged through the sewage outlet and the sewage discharging hole under the action of gravity and under the promotion of vibration of the scraper blade.