CN112896933A

CN112896933A - Scraper mechanism and scraper chain replacing method

Info

Publication number: CN112896933A
Application number: CN202110071906.2A
Authority: CN
Inventors: 雷清善; 查安鸿; 杨中柏; 贺桂生; 刘松灵; 康德悦; 粟登峰; 李永灵; 蒋玉东
Original assignee: SGIS Songshan Co Ltd
Current assignee: SGIS Songshan Co Ltd
Priority date: 2021-01-18
Filing date: 2021-01-18
Publication date: 2021-06-04

Abstract

The application relates to the technical field of material conveying equipment, in particular to a scraper mechanism and a scraper chain replacement method. A scraping mechanism comprising: the device comprises a chute, a plurality of pieces of equipment and a plurality of pieces of equipment, wherein one end of the chute is provided with an observation port; the driving chain wheel is arranged in the chute and close to one end of the observation port; the driven chain wheel is arranged in the chute and is far away from one end of the observation port; the scraper chain is sleeved on the driving chain wheel and the driven chain wheel; the upper guide shaft and the lower guide shaft are positioned at the observation port and parallel to the rotating shaft of the driving sprocket, the upper guide shaft is higher than the rotating shaft of the driving sprocket, and the lower guide shaft is not lower than the lower edge of the driving sprocket. When changing the scraper chain, scrape more than the scraper chain guide shaft and guide shaft down and be the fulcrum, utilize self dead weight tensioning, avoid scraping the scraper chain card and hinder in the chute to under drive sprocket, realize smoothly that old scraper chain exports and the assembly of new scraper chain, convenient change.

Description

Scraper mechanism and scraper chain replacing method

Technical Field

The application relates to the technical field of material conveying equipment, in particular to a scraper mechanism and a scraper chain replacing method.

Background

In the field of material conveying, a scraper mechanism is common conveying equipment, and material conveying is realized by utilizing the operation of a scraper chain. When the scraper chain is damaged, the scraper chain needs to be replaced by a new scraper chain. At present, the common replacing means is to dismantle the old scraper chain in the chute in sections and then install the new scraper chain in sections, the dismounting and the installation are very inconvenient, and the time is often consumed for a plurality of days.

Disclosure of Invention

The application aims to provide a scraper mechanism and a scraper chain replacing method so as to solve the problem that a scraper chain in the prior art is inconvenient to replace.

The embodiment of the application is realized as follows:

in a first aspect, an embodiment of the present application provides a scraper mechanism, including:

the device comprises a chute, a plurality of pieces of equipment and a plurality of pieces of equipment, wherein one end of the chute is provided with an observation port;

the driving chain wheel is arranged in the chute and close to one end of the observation port;

the driven chain wheel is arranged in the chute and is far away from one end of the observation port;

the scraper chain is sleeved on the driving chain wheel and the driven chain wheel;

the upper guide shaft and the lower guide shaft are positioned at the observation port and parallel to the rotating shaft of the driving sprocket, the upper guide shaft is higher than the rotating shaft of the driving sprocket, and the lower guide shaft is not lower than the lower edge of the driving sprocket.

The scraper chain of the scraper mechanism is generally composed of multi-section scrapers, the scrapers of adjacent sections are connected through pins, and when the driving chain wheel and the driven chain wheel rotate, the pins enter tooth grooves on the wheel periphery, so that the scraper chain is meshed with the chain wheels to be driven. The application provides a scraping plate mechanism sets up guide shaft and lower guide shaft through the position at the viewing aperture, when changing the scraper chain, can take the upper end of old scraper chain on last guide shaft, takes the lower extreme of old scraper chain under on the guide shaft, then will newly scrape the scraper chain and connect in the upper end of old scraper chain. Because the upper guide shaft is higher than the rotating shaft of the driving chain wheel, the lower guide shaft is not lower than the lower edge of the driving chain wheel, the upper guide shaft and the lower guide shaft are respectively used as fulcrums, the scraper chain is supported, the two ends of the scraper chain are bent downwards, under the action of gravity at the two ends of the scraper chain, the scraper chain passes through the driving chain wheel from the upper guide shaft, the driven chain wheel is tensioned to the lower guide shaft, the driving chain wheel cannot be blocked with the scraper chain when rotating, and therefore the driving chain wheel is rotated, the old scraper chain can be driven to drive the new scraper chain to enter a chute, and meanwhile, the old scraper chain is made to exit from the chute, so that.

That is to say, the scraper blade mechanism that this application provided is when changing the scraper blade chain, and the guide shaft above the scraper blade chain and guide shaft down are the fulcrum, utilize self dead weight tensioning, avoid scraping the scraper blade chain card and hinder in the chute to under drive sprocket, realize smoothly that old scraper blade chain exports and the assembly of new scraper blade chain, convenient change.

In one embodiment of the present application, optionally, the upper guide shaft is flush with an upper edge of the drive sprocket.

In above-mentioned technical scheme, through making the last guiding axle and drive sprocket's top edge parallel and level, can lift the upper end of scraping the scraper chain and level to pin on the scraper chain falls into drive sprocket's tooth's socket.

In one embodiment of the present application, optionally, the height of the lower guide shaft is located between the rotational axis and the lower edge of the drive sprocket.

In above-mentioned technical scheme, the height of leading axle down is set up between drive sprocket's pivot and lower limb, can raise the lower extreme of scraper chain to drive sprocket's tooth's socket can be better with pin meshing.

In an embodiment of the present application, optionally, the scraper mechanism further includes two upper supporting seats and two lower supporting seats, the two upper supporting seats are respectively detachably mounted on two sides of the observation port, and the two lower supporting seats are respectively detachably mounted on two sides of the observation port;

the two ends of the upper guide shaft are respectively connected with the two upper supporting seats, and the two ends of the lower guide shaft are respectively connected with the two lower supporting seats.

In an embodiment of the present application, optionally, both ends of the upper guide shaft are respectively rotatably connected to the two upper supporting seats, and both ends of the lower guide shaft are respectively rotatably connected to the two lower supporting seats.

In above-mentioned technical scheme, upper and lower guide shaft is set up to rotatable structure respectively, can reduce the friction between scraper chain and the guide shaft, further reduces the card and hinders, makes things convenient for driving sprocket pulling scraper chain.

In an embodiment of the present application, optionally, the scraper mechanism further comprises a detachable cover plate, the cover plate is installed in the viewing port, or the two upper supporting seats and the two lower supporting seats are installed in the viewing port.

In the technical scheme, when the scraping plate mechanism normally operates, the cover plate shields the observation port so as to prevent dust and water or prevent other objects from entering the chute to cause jamming and potential safety hazards; when the scraper chain needs to be replaced, the cover plate is detached, and the two upper supporting seats and the two lower supporting seats are installed at the observation port, so that the upper guide shaft and the lower guide shaft are installed at the observation port to assist in replacing the scraper chain.

In an embodiment of the present application, optionally, the scraper mechanism further comprises a controller and a torque sensor, the torque sensor is used for sensing the torque of the driving sprocket, and the controller is electrically connected with the torque sensor and the driving sprocket respectively;

and when the detection result of the torque sensor is higher or lower than a preset value, the controller controls the driving chain wheel to stop rotating.

In above-mentioned technical scheme, when scraping the scraper chain and drop or scrape the scraper chain and hinder with the driving sprocket card, the underload or transship can appear in the driving sprocket, and the moment of torsion reduces or increases this moment, and when torque sensor's testing result was crossed low or too high, controller control driving sprocket stall to avoid driving sprocket idle running or card to die the damage.

In a second aspect, an embodiment of the present application provides a scraper chain replacing method, which includes:

detaching an old scraper chain from an observation port, erecting the upper end of the old scraper chain on an upper guide shaft, and erecting the lower end of the old scraper chain on a lower guide shaft;

connecting one end of a new scraper chain to the upper end of the old scraper chain;

starting a driving chain wheel, driving the old scraper chain to pull the new scraper chain to enter from the observation opening and to be matched with the driving chain wheel and the driven chain wheel;

and step four, after the new scraper chain is replaced, detaching the old scraper chain from the new scraper chain, and connecting the two ends of the new scraper chain.

The application provides a scrape board chain and change method, guide shaft and lower guide shaft are as the fulcrum in the setting of viewing aperture department, in order to assist taut scraper chain, make scraper chain at last guide shaft, drive sprocket, driven sprocket is taut to the part between the lower guide shaft, thereby even scrape the board chain and not constitute the annular, drive sprocket can not block with scraper chain when rotating yet, can drive old scraper chain through rotating drive sprocket and drive new scraper chain and get into the chute, make old scraper chain withdraw from the chute simultaneously, accomplish scraper chain and change under the condition that does not increase other power equipment, play the effect of conveniently changing scraper chain.

In an embodiment of the present application, optionally, before the first step, two upper supporting seats and two lower supporting seats are installed at the viewing port, the upper guide shaft is installed on the two upper supporting seats, and the lower guide shaft is installed on the two lower supporting seats;

the upper guide shaft is higher than the rotating shaft of the driving chain wheel, and the lower guide shaft is not lower than the lower edge of the driving chain wheel.

In one embodiment of the present application, optionally, in the third step, the driving sprocket rotates in a jog start mode.

In the technical scheme, the driving chain wheel is rotated in a inching starting mode, so that the driving chain wheel can be flexibly controlled to facilitate manual auxiliary operation.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic top view of a scraper mechanism according to an embodiment of the present disclosure in normal operation;

fig. 2 is a schematic front view of a scraper mechanism provided in an embodiment of the present application when a scraper chain is replaced;

fig. 3 is a schematic side view of a scraper mechanism provided in the embodiment of the present application when replacing a scraper chain.

Icon: 100-chute; 110-a viewing port; 120-a cover plate; 200-a drive sprocket; 210-a reduction motor; 300-a driven sprocket; 400-scraper chain; 410-upper end; 420-lower end; 400 a-old scraper chain; 400 b-a new scraper chain; 500-upper guide shaft; 510-upper support base; 600-lower guide shaft; 610-lower support seat.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Examples

At present, the common means for replacing the scraper chain is to dismantle the old scraper chain in the chute in sections and then install the new scraper chain in sections, and the dismantling and the installation are very inconvenient. The equipment needed to be used comprises but is not limited to a winch, a steel wire rope and a special hanging lock, and at least four fitters, one winch operator and one electric welder are needed to cooperate. During the operation, cut earlier old scraper chain, will newly scrape the scraper chain and connect in old scraper chain, use the hoist engine to pull out old scraper chain in order to drive the new scraper chain of installation, then the old scraper chain is demolishd in the segmentation, dragging the in-process, the linear velocity of hoist engine is the same with the linear velocity of sprocket, just can guarantee that the chain tensioning does not block, therefore whole process is very careful and slow, often need consume many days to scrape the scraper chain in the converter dust remover as an example, need two workdays at least just can the completion.

The scraper mechanism and the scraper chain replacing method provided by the embodiment of the application can solve the problem that the scraper chain is inconvenient to replace.

As shown in fig. 1, 2 and 3, the scraper mechanism includes a chute 100, a driving sprocket 200, a driven sprocket 300, and a scraper chain 400.

The driving sprocket 200 and the driven sprocket 300 are installed in the chute 100, and the driving sprocket 200 further includes a reduction motor 210 for driving.

The scraper chain 400 is sleeved on the driving sprocket 200 and the driven sprocket 300, and the speed reducing motor 210 drives the driving sprocket 200 to rotate so as to drive the scraper chain 400 and the driven sprocket 300 to move.

One end of the chute 100 is provided with a viewing port 110, and the viewing port 110 is disposed at an end adjacent to the drive sprocket 200. The drive sprocket 200 can be conveniently overhauled through the observation opening 110 to eliminate the problems of jamming of the drive sprocket 200 and the like.

Alternatively, at the viewing port 110, a cover plate 120 and an auxiliary chainchange assembly are installed.

When the scraper mechanism is operating normally, the cover plate 120 shields the viewing port 110 from dust, water, or other objects entering the chute 100 that may cause jamming and create a potential safety hazard.

When the scraper chain 400 is damaged and the scraper chain 400 needs to be replaced, the cover plate 120 is detached and an auxiliary chain replacement assembly is provided to the viewing port 110 for tensioning the old scraper chain 400a and the new scraper chain 400 b.

The auxiliary chain changing assembly includes an upper guide shaft 500 and a lower guide shaft 600, the upper guide shaft 500 and the lower guide shaft 600 are respectively parallel to the rotation axis of the driving sprocket 200, the upper guide shaft 500 is higher than the rotation axis of the driving sprocket 200, and the lower guide shaft 600 is not lower than the lower edge of the driving sprocket 200.

The scraper chain 400 is typically constructed of multi-segmented scrapers with adjacent segments of scrapers connected by pins. Tooth grooves are formed on the peripheries of the driving sprocket 200 and the driven sprocket 300, respectively, and when the driving sprocket 200 and the driven sprocket 300 rotate, the pins of the scraper chain 400 enter the tooth grooves on the peripheries of the sprockets, so that the scraper chain 400 is engaged with the sprockets and driven.

When the scraper chain 400 is replaced, the old scraper chain 400a is detached from the viewing port 110, and the upper end 410 of the old scraper chain 400a is mounted on the upper guide shaft 500, the lower end 420 of the old scraper chain 400a is mounted on the lower guide shaft 600, and then one end of the new scraper chain 400b is connected to the upper end 410 of the old scraper chain 400 a.

Since the upper guide shaft 500 is higher than the rotation axis of the driving sprocket 200 and the lower guide shaft 600 is not lower than the lower edge of the driving sprocket 200, the upper guide shaft 500 and the lower guide shaft 600 can be respectively used as fulcrums.

The upper end 410 and the lower end 420 of the scraper chain 400 are supported by the upper guide shaft 500 and the lower guide shaft 600, respectively, as shown in fig. 3, the upper end 410 of the scraper chain 400 is turned downward by the upper guide shaft 500 as a support, and the lower end 420 of the scraper chain 400 is turned downward by the lower guide shaft 600 as a support, so that the scraper chain 400 is tensioned under the self-weight of both ends thereof, and a plurality of continuous segments from the upper guide shaft 500 to the lower guide shaft 600 via the driving sprocket 200 and the driven sprocket 300 are in a tensioned state.

In the tensioned state, when the driving sprocket 200 rotates, the scraper chain 400 is not easily loosened.

Thus, by way of example in the position shown in fig. 3, the old scraper chain 400a is smoothly driven and the new scraper chain 400b is driven into the chute 100 by rotating the drive sprocket 200 in the clockwise direction, and the old scraper chain 400a is completely removed from the chute 100 by continuously rotating the drive sprocket 200, and the new scraper chain 400b enters the chute 100 and is fitted to the drive sprocket 200 and the driven sprocket 300, thereby completing the replacement.

In order to stably drop the pin of the scraper chain 400 into the tooth space of the driving sprocket 200, the upper guide shaft 500 is higher than the rotation shaft of the driving sprocket 200 and is not higher than one third of the diameter of the driving sprocket 200. So that the upper guide shaft 500 lifts the upper end 410 of the scraper chain 400 and the scraper chain 400 does not come off the periphery of the driving sprocket 200, so that the pin can stably fall into the tooth space engagement when the tooth space of the driving sprocket 200 is rotated to the upper position.

Further, in the present embodiment, the upper guide shaft 500 is flush with the upper edge of the driving sprocket 200.

The upper guide shaft 500 lifts the upper end 410 of the scraper chain 400 to make the pin on the scraper chain 400 fall into the tooth space of the driving sprocket 200 by the self weight of the pin when the tooth space rotates to the top, and the driving sprocket 200 rotates clockwise to pull the pin to the direction of the driven sprocket 300.

And because the upper end 410 of the scraper chain 400 is tensioned and lifted, the scraper chain 400 is pulled in a translational process, and compared with the prior art in which the pin is lifted by the tooth socket and then conveyed backwards, the driving sprocket 200 does less work and is more energy-saving and moves more smoothly.

In order to stably engage the lower end 420 of the scraper chain 400 with the tooth grooves of the driving sprocket 200, the height of the lower guide shaft 600 is located between the rotational axis and the lower edge of the driving sprocket 200.

So that the lower guide shaft 600 can raise the lower end 420 of the scraper chain 400 to prevent the scraper chain 400 from being separated from the lower edge of the driving sprocket 200 so that the tooth grooves of the driving sprocket 200 can be well engaged with the pins.

Further, in the present embodiment, the lower guide shaft 600 is flush with the rotation shaft of the driving sprocket 200.

Thus, the scraper chain 400 can be attached to the lower edge of the driving sprocket 200 to the position closest to the viewing opening 110, and the contact area between the scraper chain 400 and the driving sprocket 200 is large, so that the teeth of the driving sprocket 200 are prevented from missing the pins of the scraper chain 400 when rotating to the lower side, and the driving sprocket 200 is prevented from idling.

The upper guide shaft 500 and the lower guide shaft 600 may be fixedly disposed at an end adjacent to the viewing port 110 of the chute 100, or may be detachably coupled to the viewing port 110.

In this embodiment, the upper guide shaft 500 and the lower guide shaft 600 are detachably connected to the viewing port 110, and the scraper mechanism further includes two upper supporting seats 510 and two lower supporting seats 610, wherein the two upper supporting seats 510 are used for mounting the upper guide shaft 500, and the two lower supporting seats 610 are used for mounting the lower guide shaft 600.

Referring to fig. 2 and 3 again, two upper supporting seats 510 are detachably mounted on two sides of the viewing port 110, respectively, and two ends of the upper guide shaft 500 are connected to the two upper supporting seats 510, respectively; the two lower support seats 610 are detachably installed at both sides of the viewing port 110, respectively, and both ends of the lower guide shaft 600 are connected to the two lower support seats 610, respectively.

Flange holes are respectively formed in the two upper support seats 510, the two lower support seats 610 and the observation opening 110 of the chute 100, and the two upper support seats 510 and the two lower support seats 610 can be fixed to the observation opening 110 by using anchoring members such as bolts.

The positions of the flange holes at the viewing port 110 are set so that the upper and

lower guide shafts

500 and 600 can be disposed at desired positions.

In order to further reduce the friction between the scraper chain 400 and the guide shaft to further reduce the jamming and facilitate the driving sprocket 200 to pull the scraper chain 400, both ends of the upper guide shaft 500 are rotatably connected to the two upper supporting seats 510, respectively, and both ends of the lower guide shaft 600 are rotatably connected to the two lower supporting seats 610, respectively.

The scraper chain 400 replacement method provided in this embodiment is based on the aforementioned scraper mechanism, before replacement, two upper supporting seats 510 and two lower supporting seats 610 are installed at the viewing port 110, the upper guide shaft 500 is installed on the two upper supporting seats 510, the lower guide shaft 600 is installed on the two lower supporting seats 610, the upper guide shaft 500 is higher than the rotating shaft of the driving sprocket 200, and the lower guide shaft 600 is not lower than the lower edge of the driving sprocket 200.

Then, the replacement is started:

firstly, detaching the old scraper chain 400a from the observation opening 110, setting the upper end 410 of the old scraper chain 400a on the upper guide shaft 500 and setting the lower end 420 of the old scraper chain 400a on the lower guide shaft 600;

step two, connecting one end of a new scraper chain 400b to the upper end 410 of the old scraper chain 400 a;

step three, the driving sprocket 200 is started, and the old scraper chain 400a is driven to pull the new scraper chain 400b to enter from the observation opening 110 and be matched with the driving sprocket 200 and the driven sprocket 300;

step four, after the replacement of the new scraper chain 400b is completed, the old scraper chain 400a is detached from the new scraper chain 400b, and both ends of the new scraper chain 400b are connected.

During the replacement process, if the scraper chain 400 falls off or the scraper chain 400 is jammed with the driving sprocket 200, the driving sprocket 200 may be under-loaded or overloaded, and the torque is reduced or increased.

When the torque is too low, the scraper chain 400 may have disengaged from the drive sprocket 200, and the drive sprocket 200 is in an idle state.

When the torque is too high, the scraper chain 400 is stuck on the driving sprocket 200, so that the driving sprocket 200 cannot rotate, and at the moment, if the output of the speed reducing motor 210 is continuously output, the rotation can be blocked, so that the overload burn-in is caused.

In order to avoid the occurrence of idle running or jamming, the aforementioned scraper mechanism is further provided with a controller and a torque sensor, the torque sensor is used for sensing the torque of the driving sprocket 200, and the controller is electrically connected with the torque sensor and the driving sprocket 200 respectively.

Before the deceleration motor 210 of the drive sprocket 200 is started, a preset value is set in the controller, and since there may be a small variation in the force applied between the drive sprocket 200 and the scraper chain 400 in actual operation, the preset value may be set to a torque range, and when the detection result of the torque sensor is higher or lower than the range, the controller controls the drive sprocket 200 to stop rotating.

In addition, the driving sprocket 200 rotates in a inching starting mode so as to facilitate manual auxiliary operation and control, ensure that the pin is effectively meshed with the driving sprocket 200, and avoid the situation that the pin does not fall into the tooth socket under the action of self weight and the tooth socket rotates away.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A scraping mechanism, comprising:

2. The flight mechanism of claim 1, wherein the upper guide shaft is flush with an upper edge of the drive sprocket.

3. The flight mechanism of claim 1, wherein the height of the lower guide shaft is between the rotational axis and the lower edge of the drive sprocket.

4. The scraper mechanism as claimed in claim 1, further comprising two upper supporting seats and two lower supporting seats, the two upper supporting seats being detachably mounted on both sides of the observation port, respectively, and the two lower supporting seats being detachably mounted on both sides of the observation port, respectively;

5. The scraper mechanism as claimed in claim 4, wherein both ends of the upper guide shaft are rotatably connected to the two upper supporting seats, respectively, and both ends of the lower guide shaft are rotatably connected to the two lower supporting seats, respectively.

6. The scraper mechanism as claimed in claim 4, further comprising a removable cover plate, said cover plate being mounted to said viewing port, or said two upper supports and two lower supports being mounted to said viewing port.

7. The flight mechanism as claimed in claim 1, further comprising a controller and a torque sensor for sensing the torque of the drive sprocket, the controller being electrically connected to the torque sensor and the drive sprocket, respectively;

8. A method of changing a scraper chain, comprising:

9. The method for replacing a scraper chain as claimed in claim 8, wherein, before step one, two upper supporting seats and two lower supporting seats are installed at the viewing port, the upper guide shaft is installed at the two upper supporting seats, and the lower guide shaft is installed at the two lower supporting seats;

10. The method for changing a scraper chain as claimed in claim 8, wherein in step three, said drive sprocket is rotated in a jog start mode.