Sprocket and drag mechanism

Abstract

The present invention provides a sprocket and a drag mechanism, wherein the sprocket includes a sprocket body, the sprocket body is provided with sprocket teeth, and the sprocket teeth are provided with an engagement groove suitable for engaging with a chain; when the driving structure drives the chain through the sprocket, the middle portion of the chain link is inserted into the engagement groove and is driven to move by the engagement groove. The residue adhering to the chain is scraped off by the side walls of the engagement groove during the process of entering the engagement groove, thereby reducing the amount of residue adhering to the chain and preventing the residue from adhering to the chain in large quantities during the maintenance of the slag scraper. Preferably, the depth of the engagement groove is set to be greater than or equal to 1 / 2 of the chain height, so that the residue adhering to the chain can be removed as much as possible.

Description

Technical Field

[0001] The present invention relates to the technical field of slag scooping machines, and in particular to a sprocket and a dragging mechanism that can be used in a slag scooping machine. Background Art

[0002] After pulverized coal burns, cracks, and releases energy in a pressurized gasifier, it forms a residue. To facilitate subsequent processing, the residue needs to be cooled and separated from the water. Typically, the residue is first discharged into a slag pool for cooling, then removed using a device called a slag scraper. The scraper, typically driven by a chain, gradually removes the residue from the slag pool, achieving a gradual separation of the slag and water.

[0003] The chains currently used in slag extraction machines are essentially circular chain chains. Circular chain chains are composed of individual circular rings strung together, and their inherent structure results in poor pitch consistency. Furthermore, the rings are in line contact with each other. When the circular chain drives the scraper, the rings exert a strong squeezing force, which is transmitted through line contact. The slag formed by the combustion and cracking of pulverized coal in the gasifier is hard, fine, and corrosive. When the circular chain drives the scraper, the fine slag enters the contact areas between the rings. The high squeezing force causes the wear layer at these contact points to wear more rapidly. This wear accelerates the wear of the circular chain, and the circular chain links at different locations do not wear synchronously, further exacerbating the problem of poor pitch consistency. When the pitch consistency deteriorates to a certain level, the hook plate it drives deflects, making it impossible to remove the slag, necessitating chain replacement.

[0004] Due to the harsh working environment, domestically produced round link chains generally fail to meet the use requirements. Manufacturers usually have to purchase expensive, highly wear-resistant round link chains produced abroad (a 100-meter-long imported chain generally costs hundreds of thousands of RMB, which is very costly). Even so, the service life of the chain generally does not exceed two years.

[0005] In addition, the slag scraper usually needs to be shut down for maintenance after running for a few months. During the maintenance period, scale and a large amount of adhesion will appear on the chain and sprocket. When the slag scraper is started again, it is easy for the sprocket to be adhered to the residue and scale and affect the engagement of the chain and sprocket, resulting in tooth jumping or even chain falling. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the technical defect in the prior art that the sprocket is prone to adherence to residues during shutdown and maintenance, which makes it easy to cause tooth jumping or even chain falling when the slag remover is started again, thereby providing a sprocket that is not easy to adhere to residues.

[0007] The present invention also provides a dragging mechanism which is not prone to residue adhesion.

[0008] To this end, the present invention provides a sprocket, comprising a sprocket body and a plurality of sprocket teeth evenly arranged on the outer periphery of the sprocket body, wherein the sprocket teeth are provided with engaging grooves suitable for engaging with a chain.

[0009] As a preferred solution, at least one slag discharge hole is provided at the bottom of the meshing groove, one end of the slag discharge hole is communicated with the bottom of the meshing groove, and the other end extends downward to communicate with the outside.

[0010] As a preferred solution, the two slag unloading holes are a pair, and at least one pair of slag unloading holes is provided at the bottom of the meshing groove. One end of a pair of slag unloading holes is connected at the bottom of the meshing groove, and the other end extends downward to connect with the outside world from both sides of the sprocket body.

[0011] As a preferred solution, the portion of the sprocket body located between two adjacent sprocket teeth forms a pointed ridge structure, with the pointed end facing outward.

[0012] The present invention also provides a dragging mechanism, comprising:

[0013] The chains are at least one pair, arranged parallel to each other and having a space in the middle;

[0014] at least one pair of sprockets, respectively engaged with the chain, for driving the chain transmission;

[0015] The scraper is installed in the spacing space, and its two ends are fixedly connected to a pair of chains respectively; the sprocket is any one of the sprockets described above.

[0016] As a preferred solution, the chain includes:

[0017] outer links, having several, each with a U-shaped opening at both ends;

[0018] There are a plurality of inner chain links, each end of which is provided with an inner chain link mounting hole;

[0019] A plurality of pins are provided, which pass through the inner chain link mounting holes and install the inner chain links inside the U-shaped opening, thereby connecting the outer chain links and the inner chain links in series to form a chain structure;

[0020] The pin is fixedly connected to the outer chain link and does not rotate relative to it after installation; the inner diameter of the inner chain link mounting hole is larger than the outer diameter of the pin, and the inner chain link can rotate around the pin after installation;

[0021] The width of the middle portion of the outer link is substantially the same as the width of the middle portion of the inner link, and both are less than or equal to the width of the engagement groove.

[0022] As a preferred solution, the outer chain link includes a standard chain link, and the standard chain link includes a standard chain link body and the U-shaped openings provided at both ends of the standard chain link body.

[0023] As a preferred solution, the outer chain link includes a scraper chain link, the scraper chain link includes a scraper chain link body, and the U-shaped openings are arranged at both ends of the scraper chain link body, and a scraper connecting structure for connecting a scraper is provided on one side of the scraper chain link body.

[0024] As a preferred solution, the scraper connection structure includes two scraper connection pieces arranged opposite to each other, and both of the scraper connection pieces are provided with scraper connection holes for connecting to the scraper via scraper pins.

[0025] The technical solution provided by the present invention has the following advantages:

[0026] 1. The sprocket of the present invention has sprocket teeth on its main body, and the sprocket teeth are provided with meshing grooves suitable for meshing with the chain. When the drive structure drives the chain through the sprocket, the middle portion of the chain link is inserted into the meshing groove and is driven by the meshing groove. Residue adhering to the chain is scraped off by the side walls of the meshing groove during the process of entering the meshing groove, thereby reducing the amount of residue adhering to the chain and preventing large amounts of residue from adhering to the chain during the maintenance of the slag scraper. Preferably, the depth of the meshing groove is set to be greater than or equal to 1 / 2 of the chain height to remove as much residue adhering to the chain as possible.

[0027] 2. The sprocket of the present invention has at least one slag discharge hole at the bottom of the meshing groove, and the fine residue mixed with the water flow can be discharged through the slag discharge hole after sliding from the chain into the meshing groove, so as to keep the inside of the meshing groove clean; it should be pointed out that the larger volume of residue can slide from the two large side openings of the meshing groove; preferably, two slag discharge holes can be provided as a pair, which are arranged opposite to each other, with the upper end openings connected to each other and the lower end openings extending downward to communicate with the outside world from both sides of the sprocket body; after such arrangement, the upper openings of a pair of slag discharge holes are larger, which can quickly accommodate the residue dropped from the chain in a short time, and this part of the residue can flow out from the bottom of any slag discharge hole under the vibration of the rotation of the sprocket, or it can fall out directly from the upper opening when the sprocket rotates to the upper opening facing downward.

[0028] 3. In the sprocket of the present invention, the portion of the sprocket body located between two adjacent sprocket teeth forms a pointed ridge structure, with the pointed end facing outward. When a certain section of the chain is in this position, the residue adhering to the chain will slide downward under the action of gravity and vibration. At this time, the design of the pointed ridge structure makes it so that after the residue slips off the chain, it has no support and can only slide down along the side slope of the pointed ridge structure, thereby avoiding as much as possible the residue that can slide off from the chain and sprocket from staying.

[0029] 4. The present invention also provides a dragging mechanism, a chain, a sprocket and a scraper, wherein there is at least a pair of chains, which are arranged in parallel and have a spacing space formed in the middle; there is at least one sprocket, which can engage with the chain and is used to drive the chain transmission; the scraper is installed in the spacing position of the pair of chains, and is driven by the chain to scrape out residue from the inside of the slag water pool to the outside; the sprocket is the above-mentioned sprocket. Due to the use of the above-mentioned sprocket, the adhesion of residue on the sprocket and chain can be reduced, and the influence of residue and scaling on the sprocket and chain on the engagement of the chain and sprocket can be reduced, and the probability of problems such as tooth jumping and chain falling can be reduced.

[0030] 5. The dragging mechanism of the present invention comprises a chain including an outer link, an inner link and a pin shaft. Both ends of the outer link are provided with a U-shaped opening, and both ends of the inner link are provided with an inner link mounting hole. After the pin shaft passes through the inner link mounting hole, the inner link is installed inside the U-shaped opening, thereby connecting the outer link and the inner link in series to form a chain structure.

[0031] Compared with traditional round link chains, the chain structure of the present invention has at least the following advantages: 1) large contact area, low pressure, and better wear resistance; when the chain of the present invention drives the scraper to run, the extrusion force is transmitted between the outer link and the inner link through the pin shaft. Since the pin shaft is fixed to the outer link, there is no wear between the pin shaft and the outer link, and the pressure is transmitted through the surface contact between the pin shaft and the inner link mounting hole of the inner link. Compared with the line contact pressure transmission between the rings of the round link chain in the prior art, the contact area is large, and the pressure between the pin shaft and the inner link is shared and reduced, so the wear at the contact position between the pin shaft and the inner link is smaller; 2) precision forging can be used, and the pitch consistency is good; the outer link and the inner link of the present invention can be made by precision forging, and the manufacturing accuracy is strictly controlled, so that the combined chain has better pitch consistency; 3) even if the chain of the present invention is worn, it occurs between the pin shaft and the inner link. The pin shaft and inner link that do not meet the requirements can be replaced without replacing the entire chain, thereby reducing replacement costs. Furthermore, the wear resistance coefficient of the pin shaft can be set to be greater than the wear resistance coefficient of the inner link mounting hole position. When wear occurs, the wear is controlled to occur mainly on the inner link, and only the inner link needs to be replaced subsequently; or conversely, the wear resistance coefficient of the pin shaft can be set to be smaller than the wear resistance coefficient of the inner link mounting hole position. When wear occurs, the wear is controlled to occur mainly on the pin shaft, and only the pin shaft needs to be replaced subsequently.

[0032] 6. The outer links of the drag mechanism of the present invention include standard links. These links form the main body of the chain and adjust the spacing between the links that drive the scraper. The width of the middle portion of the standard link is smaller than the width of the end portion, allowing it to mesh with the engagement groove.

[0033] 8. In the drag mechanism of the present invention, the outer chain link includes a scraper link, and a scraper connecting structure for connecting the scrapers is disposed on a side surface of the scraper link body; alternatively, the scraper connecting structure for connecting the scrapers is disposed on a side surface of the inner chain link. When the transmission chain structure is driven, the scrapers are driven by the scraper connecting structure.

[0034] 9. In the drag mechanism of the present invention, the upper portion of the side of the scraper link body with the scraper connecting piece is flush with the end side of the scraper link, making the scraper link body more solid and durable. The lower portion of the side of the scraper link 141 with the scraper connecting piece 41 is recessed inward relative to the end of the scraper link 141, and the side of the scraper link body without the scraper connecting piece is recessed inward relative to the end side of the scraper link, thereby being suitable for engagement with the sprocket. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the prior art or the specific embodiments of the present invention, the following briefly introduces the drawings used in the description of the prior art or the specific embodiments.

[0036] Figure 1 It is a schematic structural diagram of the sprocket and chain after being engaged with each other in the present invention.

[0037] Figure 2 yes Figure 1 Cross-section of the middle sprocket teeth.

[0038] Figure 3 yes Figure 1 A cross-sectional view of the outer edge of the sprocket body between two adjacent sprocket teeth.

[0039] Figure 4 This is a top view of the chain and scraper after installation.

[0040] Figure 5 yes Figure 4 Left view of .

[0041] Figure numerals: 1. outer link; 10. U-shaped opening; 11. first outer link mounting hole; 12. second outer link mounting hole; 13. standard link; 131. standard link body; 14. scraper link; 141. scraper link body; 15. arc surface; 2. inner link; 20. inner link mounting hole; 3. pin; 4. scraper; 41. scraper connecting piece; 42. scraper connecting hole; 43. scraper pin; 51. sprocket body; 52. sprocket teeth; 53. meshing groove; 54. slag discharge hole; 55. ridge structure. DETAILED DESCRIPTION

[0042] The technical solution of the present invention is described in detail below with reference to the accompanying drawings.

[0043] Example 1

[0044] This embodiment provides a sprocket, such as Figure 1-2 As shown, it includes a sprocket body 51 and a plurality of sprocket teeth 52 evenly arranged on the outer periphery of the sprocket body 51. The sprocket teeth 52 are provided with engaging grooves 53 suitable for engaging with the chain.

[0045] When the driving structure drives the chain through the sprocket, the middle part of the chain plate is inserted into the meshing groove 53 and is driven to move by the meshing groove 53. The residue adhering to the chain is scraped off by the two side walls of the meshing groove 53 during the process of entering the meshing groove 53, thereby reducing the amount of residue adhering to the chain and avoiding a large amount of residue adhering to the chain during the maintenance of the slag scooping machine.

[0046] As a preferred solution, the depth of the engagement groove can be set to be greater than or equal to 1 / 2 of the chain height, so as to remove the residue adhering to the chain as much as possible.

[0047] A pair of slag discharge holes 54 are provided at the bottom of the meshing groove 53. One ends of the two slag discharge holes 54 are connected to each other and connected to the outside world from the bottom of the meshing groove 53. The other ends of the two slag discharge holes 54 extend downward to connect to the outside world from both sides of the sprocket body 51.

[0048] As a modified design solution, one or more separate or interconnected slag discharge holes 54 can be set at the bottom of the meshing groove 54, one end of the slag discharge hole 54 is connected to the bottom of the meshing groove 53, and the other end extends downward to communicate with the outside.

[0049] After the fine residue mixed with water flows down from the chain into the meshing groove 53 , it can be discharged through the residue discharge hole 54 , keeping the meshing groove 53 clean. It should be noted that larger residue can slide down from the two large side openings of the meshing groove 53 .

[0050] The two slag unloading holes 54 form a pair and are arranged opposite to each other. The upper openings are connected to each other, and the lower openings extend downward to connect with the outside world from both sides of the sprocket body 51. The upper openings of a pair of slag unloading holes 54 are larger, which can quickly accommodate the residue dropped from the chain in a short time. This part of the residue can flow out from the bottom of any slag unloading hole 54 under the vibration of the rotation of the sprocket, or it can fall out directly from the upper opening when the sprocket rotates to the upper opening facing downward.

[0051] refer to Figure 3 As shown, the portion of the sprocket body 51 located between two adjacent sprocket teeth 52 forms a pointed ridge structure 55 , with the pointed end facing outward.

[0052] When a certain section of the chain is in this position, the debris adhering to the chain will slide down under the action of gravity and vibration. At this time, the design of the sharp ridge structure 55 makes it so that after the debris slides off the chain, it has no support and can only slide down along the side slope of the sharp ridge structure 55, thereby avoiding as much as possible the debris that can slide off from staying on the chain and sprocket.

[0053] Example 2

[0054] This embodiment provides a drag mechanism, referring to Figure 1 、 Figure 4 As shown, it includes: a pair of chains, which are arranged in parallel and opposite to each other, with a spacing space in the middle; a pair of sprockets, which are respectively engaged with a pair of the chains and are used to drive the chain transmission; a scraper, which is installed in the spacing space position, and has its two ends fixedly connected to a pair of the chains, and is driven by the chain to scrape residue out from the inside of the slag water pool; the sprocket is the sprocket described in Example 1.

[0055] The use of the above-mentioned sprocket can reduce the adhesion of residues on the sprocket and chain, reduce the impact of residues and scaling on the sprocket and chain on the engagement of the chain and sprocket, and reduce the probability of problems such as tooth jumping and chain falling.

[0056] like Figure 4-5 As shown, the chain includes: outer links 1, which have a plurality of them, and each end has a U-shaped opening 10; inner links 2, which have a plurality of them, and each end has an inner link mounting hole 20; and pins 3, which pass through the inner link mounting holes 20 and then install the inner link 2 inside the U-shaped opening 10, thereby connecting the outer links 1 and the inner links 2 in series to form a chain structure.

[0057] Specifically, both ends of the outer link 1 have a U-shaped opening 10, and the two opposite side walls of the U-shaped opening 10 are respectively provided with a first outer link mounting hole 11 and a second outer link mounting hole 12; both ends of the inner link 2 are provided with an inner link mounting hole 20; after the pin shaft 3 passes through the first outer link mounting hole 11, the inner link mounting hole 20, and the second outer link mounting hole 12, the inner link 2 is installed inside the U-shaped opening 10, thereby connecting the outer link 1 and the inner link 2 in series to form a chain structure.

[0058] The pin shaft 3 is fixedly connected to the outer chain link 1 and does not rotate relative to it after installation. The inner diameter of the inner chain link mounting hole 20 is larger than the outer diameter of the pin shaft 3. After installation, the inner chain link 2 can rotate around the pin shaft 3.

[0059] Specifically, the inner diameters of the first outer link mounting hole 11 and the second outer link mounting hole 12 are the same as the outer diameter base plate of the pin 3. A press is used to press the pin 3 into the first outer link mounting hole 11 and the second outer link mounting hole 12 to achieve a tight fit. That is, after the pin 3 is installed into the first outer link mounting hole 11 and the second outer link mounting hole 12, it is in a relatively fixed state without relative rotation.

[0060] The width of the middle portion of the outer link 1 is substantially the same as the width of the middle portion of the inner link 2 , and both are less than or equal to the width of the engagement groove 53 , and can be matched and engaged with the engagement groove.

[0061] When the chain of this embodiment drives the scraper 4 to run, the extrusion force is transmitted between the outer link 1 and the inner link 2 through the pin shaft 3. Since the pin shaft 3 is fixed to the outer link 1, there is no wear between the pin shaft 3 and the outer link 1. The pressure is transmitted through surface contact between the pin shaft 3 and the inner link mounting hole 20 of the inner link 2. Compared with the line contact pressure transmission between the rings of the round link chain in the prior art, the contact area is large, and the pressure between the pin shaft 3 and the inner link 2 is shared and becomes smaller, so the wear at the contact position between the pin shaft 3 and the inner link 2 is smaller; the outer link 1 and the inner link 2 of this embodiment can be made by precision forging, and the manufacturing accuracy is strictly controlled, so that the combined chain has better pitch consistency; even if the chain of this embodiment has wear, it occurs between the pin shaft 3 and the inner link 2. The pin shaft 3 and the inner link 2 that do not meet the requirements can be replaced without replacing the entire chain, thereby reducing replacement costs.

[0062] Furthermore, the wear resistance coefficient of the pin shaft 3 can be set to be greater than the wear resistance coefficient of the position of the inner link mounting hole 20. When wear occurs, the wear is controlled to occur mainly on the inner link 2, and only the inner link 2 needs to be replaced subsequently; or conversely, the wear resistance coefficient of the pin shaft 3 can be set to be smaller than the wear resistance coefficient of the position of the inner link mounting hole 20. When wear occurs, the wear is controlled to occur mainly on the pin shaft 3, and only the pin shaft 3 needs to be replaced subsequently.

[0063] In this embodiment, the outer chain link 1 includes a standard chain link 13 and a scraper chain link 14. The standard chain link 13 includes a standard chain link body 131 and the U-shaped openings 10 provided at both ends of the standard chain link body 131. The standard chain link 13 forms the main body of the transmission chain and adjusts the spacing between the chain links used to drive the scraper 4.

[0064] The scraper link 14 includes a scraper link body 141 and the U-shaped openings 10 provided at both ends of the scraper link body 141. One side of the scraper link body 141 is provided with a scraper connection structure for connecting to the scraper 4. The scraper connection structure includes two opposing scraper connection pieces 41, each of which is provided with a scraper connection hole 42 for connecting to the scraper 4 via a scraper pin 43. When the transmission chain structure is driven, the scraper 4 is driven by the scraper connection structure.

[0065] The upper part of the side of the scraper link body 141 where the scraper connecting piece 41 is provided is flush with the end side of the scraper link 141, so that the position of the scraper link body 141 where the scraper connecting piece 41 is provided is stronger, more durable; the lower part of the side of the scraper link 141 where the scraper connecting piece 41 is provided is recessed inward relative to the end of the scraper link 141, and the side of the scraper link body 141 where no scraper connecting piece 41 is provided is recessed inward relative to the end side of the scraper link 14, so as to be suitable for engaging with the sprocket.

[0066] As a modified design solution, a scraper connecting structure for connecting to the scraper 4 may be provided on one side of the inner chain link 2 .

[0067] As a preferred solution, the pin 3 does not pass through the second outer link mounting hole 12 outward, so that the outer side of the chain, that is, the side with the second outer link mounting hole 12, has no protrusions, will not interfere with other components, and is not easy to be attached to debris.

[0068] One side of the exposed pin head of the pin shaft 3 is the side where the first outer link mounting hole 11 is provided, and the scraper connecting piece 41 is provided on this side.

[0069] The ends of the outer chain links 1 are formed with arc surfaces 15, that is, the ends of the standard chain links 13 and the scraper chain links 14 are both formed with arc surfaces 15. When the transmission chain is driven by the sprocket, the arc surfaces 15 can form surface contact with the sprocket teeth, thereby minimizing wear.

[0070] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A drag mechanism, comprising: The chains are at least one pair, arranged parallel to each other and having a space in the middle; at least one pair of sprockets, respectively engaged with the chain, for driving the chain transmission; A scraper is installed at the position of the interval space, and its two ends are fixedly connected to a pair of chains respectively; it is characterized in that: the sprocket includes a sprocket body (51), and a plurality of sprocket teeth (52) evenly arranged on the outer periphery of the sprocket body (51), and the sprocket teeth (52) are provided with an engagement groove (53) suitable for matching and engaging with the chain; the depth of the engagement groove (53) is greater than or equal to 1 / 2 of the height of the chain; when the driving structure drives the chain through the sprocket, the middle part of the chain plate of the chain is inserted into the engagement groove (53) and is driven to move by the engagement groove (53), and the residue adhering to the chain is scraped and removed by the two side walls of the engagement groove (53) during the process of entering the engagement groove (53), thereby reducing the amount of residue adhering to the chain; A pair of slag discharge holes (54) are provided at the bottom of the meshing groove (53), and the two slag discharge holes (54) form a pair. At least one pair of slag discharge holes (54) is provided at the bottom of the meshing groove (53), and one end of the pair of slag discharge holes (54) is connected at the bottom of the meshing groove (53), and the other end extends downward to communicate with the outside from both sides of the sprocket body (51); The portion of the sprocket body (51) located between two adjacent sprocket teeth (52) forms a pointed ridge structure (55), with the pointed end facing outwards; The chain comprises: A plurality of outer chain links (1) each having a U-shaped opening (10) at both ends; There are a plurality of inner chain links (2), each end of which is provided with an inner chain link mounting hole (20); A plurality of pins (3) are provided, which pass through the inner link mounting holes (20) and then mount the inner link (2) inside the U-shaped opening (10), thereby connecting the outer link (1) and the inner link (2) in series to form a chain structure; The pin shaft (3) is fixedly connected to the outer chain link (1) and does not rotate relative to each other after installation; the inner diameter of the inner chain link mounting hole (20) is larger than the outer diameter of the pin shaft (3); after installation, the inner chain link (2) can rotate around the pin shaft (3); The width of the middle portion of the outer chain link (1) and the width of the middle portion of the inner chain link (2) are substantially the same, and are both ≤ the width of the engagement groove (53); The wear resistance coefficient of the pin shaft (3) is greater than the wear resistance coefficient at the position of the inner chain link mounting hole (20), or the wear resistance coefficient of the pin shaft (3) is less than the wear resistance coefficient at the position of the inner chain link mounting hole (20); An arcuate surface (15) is formed at the end of the outer chain link (1), and when the chain is driven to move by the sprocket, the arcuate surface (15) forms surface contact with the sprocket teeth.

2. The dragging mechanism according to claim 1, characterized in that: The outer chain link (1) comprises a standard chain link (13), and the standard chain link (13) comprises a standard chain link body (131), and the U-shaped openings (10) are provided at both ends of the standard chain link body (131).

3. The dragging mechanism according to claim 1, characterized in that: The outer chain link (1) comprises a scraper chain link (14), the scraper chain link (14) comprising a scraper chain link body (141), and the U-shaped openings (10) provided at both ends of the scraper chain link body (141), and a scraper connecting structure for connecting a scraper (4) is provided on one side of the scraper chain link body (141).

4. The dragging mechanism according to claim 3, characterized in that: The scraper chain link structure comprises two scraper connecting pieces (41) arranged opposite to each other, and both scraper connecting pieces (41) are provided with scraper connecting holes (42) for connecting to the scraper (4) via scraper pins (43).

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