CN219688337U - Closed pipe chain conveying device - Google Patents

Abstract

The utility model provides a closed pipe chain conveying device, which comprises a driving box provided with a driving motor and a driven box provided with a driven sprocket; a main shaft of the driving motor is provided with a driving chain wheel; a closed material conveying pipeline and a return pipeline are arranged between the driving box and the driven box, and are connected with the driving box and the driven box in a closed manner to form an annular loop; a feed inlet is arranged on the material conveying pipeline; the driving box, the driven box, the material conveying pipeline and the return pipeline are internally provided with chains which are connected end to form a closed loop, and the chains are connected with a driving chain wheel and a driven chain wheel; the chain comprises a plurality of first chain links and second chain links which are alternately connected, wherein the first chain links and the second chain links are of sheet structures, and connecting holes capable of being connected through connecting shafts are formed in two ends of each chain link; a scraping plate is fixedly connected in the middle of each first chain link; the second chain link is meshed with the driving chain wheel and the driven chain wheel. The chain of the conveying device is not easy to be separated and broken, the chain links can be overhauled and replaced, and the number of the chain links can be increased or decreased along with the change of the length of the pipeline.

Description

Closed pipe chain conveying device

Technical Field

The utility model relates to the technical field of material conveying, in particular to a closed pipe chain conveying device.

Background

In chemical production, material conveying is particularly important, and chemical production efficiency, production capacity and the like are affected. Wherein, the unsuitable human contact's material variety that exists in the chemical industry production is various, and its main contact mode has: direct contact, volatilization contact, post-reaction contact and the like often cause direct or indirect damage to human skin, eyes, respiratory systems, internal organs and the like. With requirements of occupational health, environmental protection, automation and intelligent production, the requirements of the production process are higher and higher, and the traditional material conveying system cannot meet the requirements of the industry and the requirements of environmental protection. At present, the pipe chain conveyor is widely considered in the industry to be capable of conveying various materials which are not suitable for human contact without pollution.

The principle of the pipe chain conveyor is as follows: in the closed pipeline, the chain moves along the pipeline to drive the scraping plate arranged on the chain to move, and the scraping plate drives the material to move along the pipeline to form a continuous material flow so as to finish material conveying. Because the pipe chain conveyor adopts the ring pipe sealing type structure, dust emission and material volatilization can be prevented, no dust overflows, and the direct contact between the material and a human body in the conveying process is effectively avoided. And the loop pipe structure can be horizontally, obliquely and vertically conveyed in a multi-direction combination way, so that the device can be designed and installed in a production three-dimensional space according to the needs of customers, manual participation in the conveying process is reduced, and the device is incomparable with other conveying devices in large performance. However, existing tube chain conveyors have found some problems to be improved during use, such as: the pipe chain conveyor generally adopts a loop chain for conveying, but the loop chain is easy to be disconnected and broken in the conveying process; because the ring chain is basically of an integral structure, when pipelines with different lengths are replaced, the ring chain needs to be replaced integrally, and the defects that chain links are worn and not easy to replace, the length is difficult to adjust and the like are also caused; affecting the normal use of the tube chain conveyor. Therefore, it is necessary to develop a tube chain conveying device which can solve the above problems.

Disclosure of Invention

The utility model provides a closed pipe chain conveying device, which is used for solving the problems that a common ring chain in the existing device is easy to be disconnected and broken, the abrasion of a chain link is difficult to replace, the length of the chain is difficult to be adjusted along with the change of the length of a pipeline, and the overall replacement cost is high.

The utility model provides a closed pipe chain conveying device, which comprises: the device comprises a driving box and a driven box, wherein a driving motor is arranged in the driving box, a driving chain wheel is arranged on a main shaft of the driving motor, and a driven chain wheel is arranged in the driven box; a closed material conveying pipeline and a closed return pipeline are arranged between the driving box and the driven box, and two ends of the material conveying pipeline and the return pipeline are respectively connected with the driving box and the driven box in a closed manner to form an annular loop; a feed inlet is formed in the material conveying pipeline and used for feeding; the driving box, the driven box, the material conveying pipeline and the return pipeline are internally provided with chains which are connected end to form a closed loop, the chains are connected with a driving chain wheel and a driven chain wheel, and the chains are used for dragging conveyed materials to be conveyed to a discharge opening from a feed inlet.

Further preferably, the chain comprises a plurality of first chain links and second chain links which are alternately connected, wherein the first chain links and the second chain links are of sheet-shaped structures, and connecting holes capable of being connected through connecting shafts are formed in two ends of each chain link; a scraping plate is fixedly connected in the middle of each first chain link; the second chain link is meshed with the driving chain wheel and the driven chain wheel.

Further preferably, the second chain link comprises a connecting plate and U-shaped connecting lugs at two ends of the connecting plate, and connecting holes are formed in two side plates of the U-shaped connecting lugs; the first chain link is inserted into the U-shaped connecting lug of the second chain link and is connected through a connecting shaft inserted into the connecting hole.

Further preferably, the connection plates of the first chain link and the second chain link are arranged vertically.

Further preferably, annular elastic scraping blades are symmetrically and fixedly connected on the front side surface and the rear side surface of the scraping plate along the running direction of the chain, and the outer edges of the elastic scraping blades on the front side surface and the rear side surface are abutted with the inner walls of the conveying pipeline and the return pipeline.

Further preferably, the return pipeline is further provided with a cleaning box, the top of the cleaning box is provided with two cleaning motors, the output end of each cleaning motor is correspondingly connected with one end part of two brush rollers inside the cleaning box, and the other end part of each brush roller is rotationally connected with the inner wall of the cleaning box.

It is further preferred that two brush rollers are provided on both sides of the chain for cleaning the chain and the blade from both sides of the chain.

Further preferably, the two brush rolls are rotated in opposite directions.

Further preferably, the material conveying pipeline and the return pipeline are composed of a plurality of sections of pipe joints which are connected end to end, connecting flanges are fixed at two ends of each pipe joint along the circumferential direction, and a plurality of mounting holes are uniformly formed in each connecting flange along the circumferential direction; an inner sealing ring is convexly arranged on the connecting flange at one end of the pipe joint along the circumferential direction, an outer sealing groove concavely arranged is fixedly arranged on the connecting flange at the other end of the pipe joint along the circumferential direction, and the outer diameter of the inner sealing ring is equal to the inner diameter of the outer sealing groove.

Further preferably, the connecting flanges of two adjacent pipe sections are butted and connected through bolts penetrating through the mounting holes, and the inner sealing ring is positioned in the outer sealing groove of the adjacent pipe section.

Further preferably, the joint of the inner sealing ring and the outer sealing groove is sealed by a sealing filler, and the sealing filler is compressed by a bolt to deform and fill the gap so as to achieve the sealing effect.

The closed pipe chain conveying device provided by the utility model has the advantages that the phenomena of chain falling, chain breakage, chain falling and twisting are avoided, the chain operation is stable and continuous, the first chain link and the second chain link are connected by adopting the connecting shaft, the disconnection or connection of the chain is facilitated, the installation and the length adjustment are also facilitated, the targeted overhaul and replacement can be realized after the chain link is worn or broken, the whole service life of the chain is greatly prolonged, and the use cost of the chain is reduced.

The conveying device utilizes the cooperation of the scraping plate and the elastic scraping blade to keep the scraping plate tightly attached to the conveying pipeline, and the material can be prevented from being remained in the conveying pipeline due to the abrasion of the tube plate only by abrasion and replacement of the elastic scraping blade. Meanwhile, the cleaning box is used for cleaning the materials attached to the scraping plate, the chain and the elastic scraping plate, so that the service lives of the chain and the scraping plate are prolonged.

The sealing element, the sealing filler and other multiple sealing structures connected by the flange and the spigot are adopted between pipe joints of the pipeline of the conveying device, so that the sealing performance of the pipeline is improved, the material is conveyed by the conveying device, the problems of diffusion and dust emission cannot be caused in the conveying process, the air quality problem caused by volatilization of the material can be effectively avoided, the health of staff is ensured, the workload of staff cleaning sites can be greatly reduced, the production site is kept clean and tidy, and the environment-friendly and reliable effects are realized.

The conveying device realizes mechanized feeding, does not need manual operation, has high practicability, can be used for conveying massive, granular and powdery materials containing liquid and volatile gas, is also suitable for material conveying operation in various fields, and realizes automation, intellectualization and environmental protection of feeding.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a closed pipe chain conveying device according to an embodiment of the present utility model;

FIG. 2 is a schematic view of an embodiment of a link and flighting assembly;

FIG. 3 is a schematic view of a cleaning tank according to an embodiment of the present utility model;

fig. 4 is a schematic view illustrating installation of a pipe joint according to an embodiment of the present utility model.

Reference numerals illustrate:

1: drive box, 2: driven case, 3: material conveying pipeline, 4: backhaul pipe, 5: chain, 6: cleaning box, 11: drive motor, 12: drive sprocket, 21: driven sprocket, 31: feed inlet, 32: pipe section, 33: connection flange, 34: bolt, 35: sealing filler, 51: first link, 52: second link, 53: connecting shaft, 54: scraper blade, 61: cleaning motor, 62: brush roller, 331: inner seal ring, 332: outer seal groove, 521: connection plate, 522: u-shaped engaging lug 541: an elastic scraping blade.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions in the embodiments of the present utility model will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are also within the scope of the utility model.

As shown in fig. 1, the present utility model provides a closed pipe chain conveying apparatus, comprising: the device comprises a driving box 1 and a driven box 2, wherein a driving motor 11 is arranged in the driving box 1, a driving chain wheel 12 is arranged on a main shaft of the driving motor 11, and a driven chain wheel 21 is arranged in the driven box 2; a closed material conveying pipeline 3 and a return pipeline 4 are arranged between the driving box 1 and the driven box 2, and two ends of the material conveying pipeline 3 and the return pipeline 4 are respectively connected with the driving box 1 and the driven box 2 in a closed manner to form an annular loop; the material conveying pipeline 3 is provided with a material inlet 31 for feeding; the driving box 1, the driven box 2, the conveying pipeline 3 and the return pipeline 4 are internally provided with a chain 5 which is connected end to form a closed loop, the chain 5 is connected with a driving chain wheel 12 and a driven chain wheel 21, and the chain 5 is used for dragging conveyed materials to be fed from a feed inlet 31 to a discharge outlet.

As shown in fig. 2, it is further preferable that the chain 5 includes a plurality of first links 51 and second links 52 alternately connected, each of the first links 51 and the second links 52 has a sheet-like structure, and both ends of the links are provided with connection holes capable of being connected by connection shafts 53; a scraper 54 is fixedly connected in the middle of each first chain link 51; the second link 52 is in meshed engagement with the drive sprocket 12 and the driven sprocket 21.

When the material is conveyed, the driving motor 11 of the driving box 1 drives the driving chain wheel 12, the driving chain wheel 12 rotates to drive the driven chain wheel 21 of the driven box 2 to rotate, so that the chain 5 meshed with the driving chain wheel is driven, the scraping plate 54 on the first chain link 51 of the chain 5 scrapes the material entering from the feeding hole 31, the material is conveyed along the conveying pipeline 3, and after the material is conveyed to the discharging hole to finish discharging, the chain 5 returns to the feeding hole 31 through the return pipeline 4.

The chain 5 structure adopts connecting axle 53 to connect first chain link 51 and second chain link 52, and the disconnection or the connection of chain 5 of being convenient for also facilitate the installation to conveniently increase or reduce the quantity of first chain link 51 and second chain link 52 and adjust the length of chain 5, with this conveying pipeline 3 and return stroke pipeline 4 of matching different length, solved the difficult change of chain link in traditional endless chain, chain 5 be difficult to along with pipeline length variation regulation length, the higher problem of overall replacement cost.

Further preferably, the second chain link 52 comprises a connecting plate 521 and U-shaped connecting lugs 522 at two ends of the connecting plate 521, and connecting holes are formed in two side plates of the U-shaped connecting lugs 522; the first link 51 is inserted into the U-shaped connecting lug 522 of the second link 52 and is connected by a connecting shaft 53 inserted into the connecting hole. Still more preferably, the first links 51 are disposed perpendicular to the connection plates 521 of the second links 52.

The second chain link 52 is connected with the first chain link 51 through the U-shaped connecting lug 522, and the first chain link 51 is perpendicular to the connecting plate 521, has increased the resistance to twisting between the first chain link 51 and the second chain link 52 for the scraper blade 54 can not drive the twist between the first chain link 51 and the second chain link 52 and take place to twist, and chain 5 operates steadily continuously.

After the conveying device is used for a long time, the scraping plate 54 is in contact with the pipeline to be easily worn, so that materials can remain in the conveying pipeline 3, therefore, further preferably, annular elastic scraping plates 541 are symmetrically and fixedly connected on the front side surface and the rear side surface of the scraping plate 54 along the running direction of the chain 5, and the outer edges of the elastic scraping plates 541 on the front side surface and the rear side surface are abutted against the inner walls of the conveying pipeline 3 and the return pipeline 4.

The outer edge of the elastic scraping blade 541 is abutted against the inner wall of the pipeline, so that the pushing effect of the scraping plate 54 can be enhanced, and the material is prevented from adhering to the inner wall of the conveying pipeline 3. When the elastic scraping blades 541 on the front and rear sides along the running direction of the chain 5 are in use, after the front (or rear) elastic scraping blade 541 is worn, the rear (or front) elastic scraping blade 541 still can keep close fit with the conveying pipeline 3 all the time, so that the maintenance and replacement frequency of the scraping plate 54 and the elastic scraping blade 541 is reduced, and the elastic scraping blade 541 is more convenient to detach and replace than the scraping plate 54.

As shown in fig. 3, it is further preferable that the return pipeline 4 is further provided with a cleaning tank 6, the top of the cleaning tank 6 is provided with two cleaning motors 61, the output end of each cleaning motor 61 is correspondingly connected with one end of two brush rollers 62 inside the cleaning tank 6, and the other end of each brush roller 62 is rotatably connected with the inner wall of the cleaning tank 6.

It is further preferable that two brush rollers 62 are provided on both sides of the chain 5 for cleaning the chain 5 and the blade 54 from both sides of the chain 5. Still more preferably, the two brush rolls 62 are rotated toward each other.

The cleaning box 6 is arranged on the return pipeline 4, and the brush rollers 62 arranged on the two sides of the chain 5 rotate in opposite directions under the action of the cleaning motor 61, so that the brushes on the brush rollers 62 are used for cleaning the scraping plate 54, the chain 5 and materials attached to the elastic scraping plate 541 on the scraping plate, the friction force between the chain 5, the scraping plate 54 and the inner wall of the pipeline is avoided from being increased by the attached materials, abrasion caused by friction is avoided, and the service lives of the chain 5, the scraping plate 54, the elastic scraping plate 541 and the pipeline are prolonged.

As shown in fig. 4, it is further preferable that the conveying pipeline 3 and the return pipeline 4 are composed of a plurality of sections of pipe sections 32 connected end to end, connecting flanges 33 are fixed at two ends of the pipe sections 32 along the circumferential direction, and a plurality of mounting holes are uniformly formed on each connecting flange 33 along the circumferential direction; an inner sealing ring 331 is convexly arranged on the connecting flange 33 at one end of the pipe joint 32 along the circumferential direction, an outer sealing groove 332 concavely arranged is fixed on the connecting flange 33 at the other end of the pipe joint 32 along the circumferential direction, and the outer diameter of the inner sealing ring 331 is equal to the inner diameter of the outer sealing groove 332.

Because the conveying pipeline 3 and the return pipeline 4 are both composed of the multi-section pipe joint 32, the tightness of the pipeline is difficult to ensure, and materials are easy to overflow from the connecting gap of the pipe joint 32. Therefore, it is further preferable that the connection flanges 33 of the adjacent two pipe sections 32 are butted and connected by bolts 34 penetrating into the mounting holes, and the inner seal ring 331 is located in the outer seal groove 332 of the adjacent pipe section 32. The inner sealing ring 331 is connected with the spigot of the outer sealing groove 332, and the sealing member connected by the spigot can ensure the tightness and neutrality of material conveying so as to prevent the material from overflowing from the connecting gap of the pipe joint 32 in the conveying process.

It is further preferable that the joint of the inner seal ring 331 and the outer seal groove 332 is sealed by a seal packing 35, and the seal packing 35 is compressed by a bolt 34 to deform and fill the gap to achieve the sealing effect. The gap at the joint between the inner seal ring 331 and the outer seal groove 332 is filled with the deformation generated by the seal packing 35, so that the joint gap of the pipe joint 32 is further ensured not to be leaked, powder leaked and air leakage.

It should be noted that, the conveying pipeline 3 and the return pipeline 4 may be freely combined according to actual production requirements, may be vertical, may be horizontal, may be inclined or circular, so as to meet the requirements of different working environments, and are not particularly limited in the present utility model. The number of the first links 51 and the second links 52 in the chain 5 is selected according to the actual requirement, and the actual length is matched with the loop in the device of the present utility model, and the present utility model is not particularly limited.

It should be noted that the discharge port of the closed tube chain conveying device is disposed at one end far from the feed port 31, more preferably, the discharge port is disposed at the bottom of the driving box 1 or the driven box 2, and those skilled in the art may select according to actual production needs, and the present utility model is not limited thereto. For example, when the closed pipe chain conveying device needs to convey materials obliquely or vertically, the driving box 1 is often arranged at a high position, and if the materials are fed upwards, the discharging opening is arranged below the driving box 1; if feeding downwards, the discharge opening is arranged below the driven box 2.

The motor, the chain wheel and other elements included in the driving box 1 and the driven box 2 and the tensioning part of the chain 5 commonly used in the prior art are all products available in the market, and the connection relationship and the working principle of the tensioning part belong to the prior art and are not repeated here.

When the closed pipe chain conveying device disclosed by the utility model specifically works, materials enter the conveying pipeline 3 from the feed inlet 31, the driving motor 11 of the driving box 1 drives the driving chain wheel 12, the driving chain wheel 12 rotates to drive the driven chain wheel 21 of the driven box 2 to rotate, so that the chain 5 in meshed connection with the driving chain wheel is driven, the scraping plate 54 on the first chain link 51 of the chain 5 scrapes the materials entering from the feed inlet 31, the materials are conveyed along the conveying pipeline 3, and after the materials are conveyed to the discharge opening, the chain 5 returns to the feed inlet 31 through the return pipeline 4. The chain 5 can pass through the cleaning box 6 when running in the return pipeline 4, and the brush rollers 62 arranged on two sides of the chain 5 simultaneously rotate in opposite directions under the action of the cleaning motor 61, so that the brushes on the brush rollers 62 are used for cleaning the scraping plate 54, the chain 5 and the materials attached to the elastic scraping plate 541, and the materials are prevented from wearing the components, and the service lives of the chain 5, the scraping plate 54, the elastic scraping plate 541 and the pipeline are prolonged.

The conveying pipeline 3 and the return pipeline 4 are formed by connecting multiple pipe joints 32 end to end, wherein two adjacent pipe joints 32 are connected through a connecting flange 33 and bolts 34, and are connected through corresponding rabbets of an inner sealing ring 331 and an outer sealing groove 332 of each adjacent pipe joint 32, sealing filler 35 is arranged at the joint of the inner sealing ring 331 and the outer sealing groove 332, when the bolts 34 are fastened, the sealing filler 35 deforms to fill gaps at the joint of the inner sealing ring 331 and the outer sealing groove 332, the tightness and neutrality of material conveying are ensured, and materials are prevented from overflowing from the joint gaps of the pipe joints 32 in the conveying process.

The chain 5 is a closed loop formed by a plurality of first chain links 51 and second chain links 52 which are alternately connected, the first chain links 51 are inserted into the U-shaped connecting lugs 522 of the second chain links 52, the connecting holes on the two side plates of the U-shaped connecting lugs 522 are connected with the connecting holes of the first chain links 51 through connecting shafts 53, and the first chain links 51 are perpendicular to the connecting plates 521. The scraper 54 is fixedly connected to the middle position of the first chain link 51, annular elastic scraping blades 541 are symmetrically and fixedly connected to the front side surface and the rear side surface of the scraper 54 along the running direction of the chain 5, the outer edges of the elastic scraping blades 541 on the front side surface and the rear side surface are abutted to the inner walls of the conveying pipeline 3 and the return pipeline 4, the pushing effect of the scraper 54 can be enhanced, materials are prevented from being attached to the inner walls of the conveying pipeline 3, and the elastic scraping blades 541 are more convenient to detach and replace after being worn than the scraper 54.

When the space position and the length of the conveying pipeline 3 and the return pipeline 4 need to be adjusted according to production modification, a certain number of pipe joints 32 can be increased or decreased after the pipe joints 32 of the pipeline are disconnected, correspondingly, the chain 5 also needs to disconnect the first chain links 51 and the second chain links 52, a certain number of chain links are increased or decreased at two ends of the disconnected chain links, then the first chain links 51 and the second chain links 52 are connected again to form a closed loop, then the chain 5 is reinserted into the newly replaced conveying pipeline 3 and the return pipeline 4, the disconnected pipe joints 32 are connected again in a sealing mode, and the chain 5 is connected with the driving chain wheel 12 and the driven chain wheel 21 in a meshed mode, so that the length adjustment of the conveying pipeline 3, the return pipeline 4 and the chain 5 is realized.

In the present utility model, the detailed structure of some devices is not described in detail, but is known in the art, and is not described herein.

It should be noted that, the conveying pipeline inside the device is provided with pressure sensors or temperature sensors in different units, and meanwhile, different valves, such as a pressure release valve, a pressure regulating valve, a safety valve and the like, are also provided for regulating and stabilizing the pressure of the whole device, and also provided with pneumatic valves and the like, which are used for regulating the opening of the valves so as to regulate the material flow in the pipeline.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solution of the present utility model, and not limiting thereof; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will appreciate that; the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. A closed tube chain conveying device, comprising: the device comprises a driving box and a driven box, wherein a driving motor is arranged in the driving box, a driving chain wheel is arranged on a main shaft of the driving motor, and a driven chain wheel is arranged in the driven box;

a closed material conveying pipeline and a return pipeline are arranged between the driving box and the driven box, and two ends of the material conveying pipeline and the return pipeline are respectively connected with the driving box and the driven box in a closed manner to form an annular loop; a feed inlet is formed in the material conveying pipeline and used for feeding; the driving box, the driven box, the material conveying pipeline and the return pipeline are internally provided with chains which are connected end to form a closed loop, the chains are connected with the driving chain wheel and the driven chain wheel, and the chains are used for dragging conveyed materials to be conveyed from a feeding hole to a discharging hole;

the chain comprises a plurality of first chain links and second chain links which are alternately connected, wherein the first chain links and the second chain links are of sheet structures, and connecting holes capable of being connected through connecting shafts are formed in two ends of each chain link; a scraping plate is fixedly connected in the middle of each first chain link; the second chain link is in meshed connection with the driving chain wheel and the driven chain wheel.

2. The closed pipe chain conveying device according to claim 1, wherein the second chain link comprises a connecting plate and U-shaped connecting lugs at two ends of the connecting plate, and connecting holes are formed in two side plates of the U-shaped connecting lugs; the first chain link is inserted into the U-shaped connecting lug of the second chain link and is connected through the connecting shaft inserted into the connecting hole.

3. The closed tube chain conveyor according to claim 2, wherein the first link is disposed perpendicular to the web of the second link.

4. The closed pipe chain conveying device according to claim 1, wherein annular elastic scraping blades are symmetrically fixedly connected to the front side surface and the rear side surface of the scraping plates along the running direction of the chain, and the outer edges of the elastic scraping blades on the front side surface and the rear side surface are abutted against the inner walls of the material conveying pipeline and the return pipeline.

5. The closed pipe chain conveying device according to any one of claims 1 to 4, wherein a cleaning box is further arranged on the return pipeline, two cleaning motors are arranged at the top of the cleaning box, the output end of each cleaning motor is correspondingly connected with one end part of two brush rollers inside the cleaning box, and the other end part of each brush roller is rotatably connected with the inner wall of the cleaning box.

6. The sealed pipe chain conveying apparatus according to claim 5, wherein two brush rollers are provided on both sides of the chain for cleaning the chain and the scraper from both sides of the chain.

7. The sealed pipe chain conveying device according to claim 6, wherein the two brush rollers are rotated in opposite directions.

8. The closed pipe chain conveying device according to claim 1, wherein the material conveying pipeline and the return pipeline are composed of a plurality of pipe joints connected end to end, connecting flanges are fixed at two ends of each pipe joint along the circumferential direction, and a plurality of mounting holes are uniformly formed in each connecting flange along the circumferential direction; an inner sealing ring is arranged on the connecting flange at one end of the pipe joint in a protruding mode along the circumferential direction, an outer sealing groove which is concavely arranged is fixed on the connecting flange at the other end of the pipe joint along the circumferential direction, and the outer diameter of the inner sealing ring is equal to the inner diameter of the outer sealing groove.

9. The closed pipe chain conveying device according to claim 8, wherein the connecting flanges of two adjacent pipe sections are butted and connected through bolts penetrating through the mounting holes, and the inner sealing rings are located in the outer sealing grooves of the adjacent pipe sections.

10. The sealed pipe chain conveying device according to claim 9, wherein a sealing filler is arranged at the joint of the inner sealing ring and the outer sealing groove for sealing, and the sealing filler is pressed by the bolt to deform and fill a gap so as to achieve the sealing effect.