CN215046115U - Combined chain wheel and coal feeder - Google Patents

Abstract

The utility model relates to a modular sprocket belongs to feeder technical field, and the feeder of having solved among the prior art carries out the poor, the wearing and tearing of transmission stationarity that driving sprocket exists among the raw coal transportation process to and the problem that replacement cost is high, maintenance work load is big. The utility model discloses divide into upper left sprocket, upper right sprocket, left lower sprocket and right lower sprocket with the sprocket to through bolt and wheel hub fixed connection. The utility model discloses a combination formula sprocket is integrated configuration, and the sprocket is installed on wheel hub with bolted connection's mode, during the change, need not change wheel hub, only needs to loosen the bolt and can change the sprocket, and not only the cost is reduced has reduced the change work load moreover.

Description

Combined chain wheel and coal feeder

Technical Field

The utility model relates to a coal feeder technical field especially relates to a modular sprocket and coal feeder.

Background

Large thermal power boilers generally employ a buried scraper coal feeder to convey raw coal from a bunker to a coal mill, and the basic working flow of the coal feeder is as follows:

(1) firstly, a motor drives a driving chain wheel to rotate;

(2) then the driving chain wheel drives the chain to rotate;

(3) the chain drives the scraper mounted on the chain to move;

(4) and finally, conveying the raw coal entering the coal feeder to a coal outlet by a movable scraper to enter a coal mill.

However, the following problems occur in the process of carrying out raw coal transportation:

1) when the driving sprocket drives the chain to rotate, the teeth of the driving sprocket and the connecting rod of the chain are in line contact, so that the chain is easy to slip, the instantaneous transmission ratio is not constant, and the transmission stability is poor.

2) The contact area of the gear teeth of the driving sprocket and the meshing part of the connecting rod of the chain is small, so that large stress is generated, the gear teeth are seriously abraded, and the service life is shortened.

3) After the teeth of a cogwheel of driving sprocket takes place wearing and tearing, need whole dismantlement change, not only cause the replacement cost high, make the change work load very big moreover: the bearings at the two ends of the motor transmission shaft need to be taken down firstly, then the transmission shaft is drawn out, then the driving chain wheel is taken out, and the driving chain wheel needs to be installed again after being replaced.

SUMMERY OF THE UTILITY MODEL

In view of the aforesaid analysis, the utility model aims at providing a modular sprocket and feeder for solve the feeder among the prior art and carry out the poor, the serious wearing and tearing of transmission stationarity that the driving sprocket exists among the raw coal transportation process, and the problem that replacement cost is high, maintenance work volume is big.

The purpose of the utility model is mainly realized through the following technical scheme:

a modular sprocket comprising: the chain scraper comprises a left upper chain wheel, a right upper chain wheel, a left lower chain wheel, a right lower chain wheel and a scraper chain; the left upper chain wheel and the right upper chain wheel can be spliced into an upper chain wheel; the left lower chain wheel and the right lower chain wheel can be spliced into a lower chain wheel; the upper chain wheel and the lower chain wheel can be spliced into a chain wheel; the chain wheel and the scraper chain can be in meshed transmission.

Further, the device also comprises a hub and a transmission shaft; the upper chain wheel and the lower chain wheel are sleeved on the upper side and the lower side of the hub respectively and connected through bolts.

Further, the hub sleeve is arranged on the transmission shaft and connected through a key groove.

Further, the upper chain wheel and the lower chain wheel are of a symmetrical structure.

Furthermore, a first arc-shaped groove is formed in the upper chain wheel; the lower chain wheel is provided with a second arc-shaped groove.

Further, the upper half part of the hub is matched with the first arc-shaped groove; the lower half part of the hub is matched with the second arc-shaped groove.

Further, the upper chain wheel is fixedly connected with the hub through a first bolt; the lower chain wheel is fixedly connected with the hub through a second bolt.

Furthermore, the chain wheel is provided with an arc working surface, and the diameter of the arc working surface is the same as that of the scraper section of the scraper chain; and the arc working surface is contacted with the section surface of the scraper.

Furthermore, the upper chain wheel and the lower chain wheel are both provided with gear teeth which are uniformly distributed in the circumferential direction; when the scraper chain is in meshed transmission with the chain wheel, the scraper joint of the scraper chain is clamped between the adjacent gear teeth.

A coal feeder adopts a combined chain wheel for transmission.

The utility model discloses technical scheme can realize one of following effect at least:

1) the utility model discloses a driving sprocket adopts integrated configuration, passes through bolted connection by upper left sprocket, upper right sprocket, lower left sprocket, lower right sprocket and wheel hub and constitutes, loosens the bolt and just can take off the sprocket from wheel hub. The replacement of the chain wheel is convenient, the whole driving chain wheel does not need to be disassembled, the bearing does not need to be disassembled, the transmission shaft does not need to be disassembled, and the replacement workload is reduced.

2) The utility model discloses a contact of circular arc working face and scraper blade festival can improve the phenomenon of skidding of the teeth of a cogwheel of scraper blade festival and drive sprocket when the transmission, and the scraper blade festival can steadily and freely get into and withdraw from drive sprocket's the teeth of a cogwheel, and the transmission stationarity obviously strengthens, still slows down the wearing and tearing of sprocket simultaneously, prolongs its life.

3) The utility model discloses can reduce the cost of changing drive sprocket. In the actual working process, the worn part is mainly on the gear teeth, and the hub is usually not worn. Therefore, the utility model discloses can change the sprocket that has worn and torn very strongly to the pertinence, and other sprockets and wheel hub etc. that do not take place wearing and tearing need not change, so can practice thrift the cost.

The utility model discloses in, can also make up each other between the above-mentioned each technical scheme to realize more preferred combination scheme. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout the drawings.

FIG. 1 is a schematic structural view of a driving sprocket of the present invention;

FIG. 2 is a cross-sectional view of the driving sprocket of the present invention

FIG. 3 is a schematic view of a drive sprocket having a spacing structure;

FIG. 4 is a schematic view of a drive sprocket having an adjustment pad;

fig. 5 is a schematic view of a conditioning shim.

Reference numerals:

1-an upper sprocket; 1-1-upper left sprocket; 1-2-right upper sprocket; 1-11-a first torus; 2-a lower sprocket; 2-1-left lower sprocket; 2-2-right lower sprocket; 3, driving a shaft; a 3-1-linkage; 4-a hub; 5-connecting holes; 6-installation clearance; 7-gear teeth; 8-arc working surface; 9-scraper chain; 10-scraper segment; 11-a first bolt; 12-a second bolt; 13-a first conditioning shim; 14-second adjusting shim.

Detailed Description

The following detailed description of the preferred embodiments of the invention, which is to be read in connection with the accompanying drawings, forms a part of the invention, and together with the embodiments of the invention, serve to explain the principles of the invention and not to limit the scope of the invention.

Example 1

The utility model discloses a concrete embodiment discloses a modular sprocket, as shown in fig. 1-5, include: the chain comprises a driving chain wheel, a hub 4, a transmission shaft 3 and a scraper chain 9, wherein the hub 4 is sleeved on the transmission shaft 3 and synchronously rotates with the transmission shaft 3, the driving chain wheel is of a split structure, and the driving chain wheel is fixedly connected with the hub 4 through screws and is simultaneously spliced into a complete chain wheel; scraper chain 9 meshes with drive sprocket, drives scraper chain 9 through drive sprocket and rotates, realizes chain drive, and then realizes the transport to the raw coal.

Further, the transmission shaft 3 is connected with the hub 4 through a key, specifically, the transmission shaft 3 is provided with a connecting key 3-1, correspondingly, the hub 4 is provided with a key slot matched with the connecting key 3-1, so that the transmission shaft 3 and the hub 4 are circumferentially fixed, and the hub 4 and the transmission shaft 3 are in positioning connection through the connecting key 3-1; when the transmission shaft 3 rotates, the hub 4 can be driven to rotate synchronously.

In a specific embodiment of the present invention, as shown in fig. 1, the driving sprocket comprises: an upper chain wheel 1 and a lower chain wheel 2; the upper chain wheel 1 and the lower chain wheel 2 are of a symmetrical structure; through the joggle of the upper chain wheel 1 and the lower chain wheel 2, a complete driving chain wheel can be obtained.

Furthermore, the arc surface of the upper chain wheel 1 is attached to the hub 4, and the upper chain wheel 1 is provided with a first concave arc-shaped groove; the upper chain wheel 1 is sleeved on the upper half part of the hub 4 through a first arc-shaped groove. Similarly, the arc surface of the lower chain wheel 2 is attached to the hub 4, and the lower chain wheel 2 is provided with a second concave arc-shaped groove; the upper chain wheel 1 is sleeved on the lower half part of the hub 4 through a second arc-shaped groove.

The utility model discloses an among the concrete embodiment, go up sprocket 1 and include: a left upper sprocket 1-1 and a right upper sprocket 1-2; the lower sprocket 2 includes: a left lower chain wheel 2-1 and a right lower chain wheel 2-2.

Further, as shown in fig. 2, the left upper sprocket 1-1 and the right upper sprocket 1-2 are bilaterally symmetrical; the left lower chain wheel 2-1 and the right lower chain wheel 2-2 are symmetrical left and right.

Further, as shown in fig. 2, the left upper chain wheel 1-1 and the right upper chain wheel 1-2 are respectively attached to the left side and the right side of the hub; arc-shaped grooves are formed in the arc surface parts of the left upper chain wheel 1-1 and the right upper chain wheel 1-2, and the two grooves are spliced to form a first arc-shaped groove; arc-shaped grooves are formed in the arc surface portions of the left lower chain wheel 2-1 and the right lower chain wheel 2-2, and a second arc-shaped groove is formed after the two grooves are spliced.

In a specific embodiment of the utility model, the upper chain wheel 1 is fixedly connected with the hub 4 through a first bolt 11; the lower chain wheel 2 is fixedly connected with the hub through a second bolt 12.

Correspondingly, the outside of wheel hub 4 is equipped with convex arc bulge loop, and the cooperation of arc bulge loop and first arc recess and second arc recess realizes wheel hub 4 and last sprocket 1 and lower sprocket 2.

Furthermore, a plurality of connecting holes 5 are formed in the hub 4, and the connecting holes 5 are uniformly distributed in the circumferential direction of the hub 4. Specifically, the connection hole 5 is a threaded hole.

Correspondingly, bolt mounting holes are processed on the left upper chain wheel 1-1, the right upper chain wheel 1-2, the left lower chain wheel 2-1 and the right lower chain wheel 2-2 and correspond to the connecting holes 5.

In a specific embodiment of the present invention, as shown in fig. 1 and 2, the first bolt 11 passes through the upper sprocket 1 and is installed in the mounting hole 5, and the upper sprocket 1 is fixedly connected to the hub 4. A second bolt 12 is installed through the lower sprocket 2 in the mounting hole 5 to fixedly connect the upper sprocket 1 with the hub 4.

Further, after the upper sprocket 1 and the lower sprocket 2 are fixed to the hub 4 by the first bolt 11 and the second bolt 12, a mounting gap 6 is provided between the lower end surface of the upper sprocket 1 and the upper end surface of the lower sprocket 2.

Furthermore, the size of the mounting gap 6 is between 0.1mm and 2mm, and the size change of the upper chain wheel 1 and the lower chain wheel 2 caused by expansion with heat and contraction with cold can be adapted under different temperature conditions, so that the smoothness of transmission is ensured.

Further, the first bolt 11 includes a first screw and a first nut; a first screw penetrates through the left upper chain wheel 1-1, the hub 4 and the right upper chain wheel 1-2 in sequence and then is screwed with a first nut, and the upper chain wheel 1 is fixedly connected with the hub 4; the second bolt 12 includes a second screw and a second nut; and a second screw penetrates through the left lower chain wheel 2-1, the hub 4 and the right lower chain wheel 2-2 in sequence and then is screwed with a second nut, so that the lower chain wheel 2 is fixedly connected with the hub 4.

Furthermore, a plurality of gear teeth 7 which are uniformly distributed in the circumferential direction are processed on the left upper chain wheel 1-1, the right upper chain wheel 1-2, the left lower chain wheel 2-1 and the right lower chain wheel 2-2 which are adjacent to each other. The driving chain wheel is in meshed transmission with the scraper chain 9; the scraper chain 9 is provided with a plurality of scraper sections 10, and in the process of meshing transmission of the scraper chain and the driving chain wheel, the scraper sections 10 are clamped between the adjacent gear teeth 7.

Furthermore, the working surface of the gear tooth 7, namely the surface of the gear tooth contacting with the scraper section 10, is provided with a circular arc working surface 8 with the radius of R1.

The radius of the circular arc working surface 8 is the same as the outer diameter of the scraper section 10. That is, the scraper chain 9 includes the scraper segment 10 with radius R2, the scraper segment 10 directly contacts the circular arc working surface 8 during the rotation, and the radius R2 of the scraper segment 10 is equal to the radius R1 of the circular arc working surface 8.

Further, the central angle corresponding to the arc working surface 8 is 25-45 degrees. Under the prerequisite of guaranteeing that scraper blade festival 10 can smoothly contact with circular arc working face 8 and separation, the radian of maximize circular arc working face 8 increases the area of sprocket and scraper blade festival 10 contact, reduces the impact force.

Preferably, the central angle of the circular arc working surface 8 is 30 °.

Further, both sides of the gear teeth 7 are provided with arc working surfaces 8, and the arc working surfaces 8 and the surface of the chain wheel are in smooth transition.

When the scraper chain 9 is used for transmission, the scraper section 10 is in direct contact with the arc working surface 8 of the driving sprocket to replace the line contact transmission mode of the existing chain transmission, so that the slipping phenomenon between the scraper section 10 and the gear teeth 7 of the driving sprocket can be improved during transmission, the scraper section 10 can stably and freely enter and exit the gear teeth 7 of the driving sprocket, the transmission stability is obviously enhanced, meanwhile, the abrasion of the sprocket is reduced, and the purpose of prolonging the service life of the chain is achieved.

Furthermore, elastic washers are arranged between the first bolt 11 and the upper chain wheel 1 and between the second bolt 12 and the lower chain wheel 2.

In a specific embodiment of the present invention, the elastic washer is made of rubber. The elastic washers are arranged between the first screw and the left upper chain wheel 1-1, between the first nut and the right upper chain wheel 1-2, between the second screw and the left lower chain wheel 2-1 and between the second nut and the right lower chain wheel 2-2.

The elastic washer is used for filling gaps between the first bolt 11 and the upper chain wheel 1 and between the second bolt 12 and the lower chain wheel 2, so that the first bolt 11 or the second bolt 12 is prevented from loosening under the vibration condition, and the structural stability of the driving chain wheel is ensured.

In the implementation process, aiming at the problems of poor transmission stability, serious abrasion, high replacement cost and large maintenance workload of a driving sprocket of an embedded scraper coal feeder, the combined sprocket of the embodiment is adopted for transmission, a hub 4 is sleeved on a transmission shaft 3 in an interference fit manner, and an upper sprocket 1 and a lower sprocket 2 are fixedly connected with the hub through a first bolt 11 and a second bolt 12 respectively; after the upper chain wheel 1, the lower chain wheel 2 and the hub 4 are fixed, the upper chain wheel 1 and the lower chain wheel 2 are spliced into a complete driving chain wheel; and the driving chain wheel is meshed with the scraper chain 9 for transmission to convey the raw coal.

When the replacement is carried out, only the bolt needs to be disassembled, so that the working efficiency is improved. Present sprocket all with wheel hub 4 or 3 interference fit of transmission shaft, the assembly with dismantle the degree of difficulty big, and extravagant man-hour, the combination formula sprocket of this embodiment is fixed and is dismantled through the bolt, replaces joint (interference fit) for threaded connection, only need screw up or unscrew the bolt and can realize assembling and dismantling the sprocket, has alleviateed workman's intensity of labour, and has accelerated operating speed.

And, be equipped with circular arc working face 8 on the teeth of a cogwheel of driving sprocket, and the diameter of circular arc working face 8 is the same with the external diameter of scraper blade section 10 of scraper chain 9, and during the transmission, scraper blade section 10 contacts with circular arc working face 8, has increased the area of contact between sprocket and the chain, has reduced the damage of impact that the transmission in-process produced to the sprocket, has prolonged the life of sprocket.

Further, in order to enhance the stability of the whole chain wheel, a limiting structure is arranged between the left upper chain wheel 1-1 and the right upper chain wheel 1-2 and between the left lower chain wheel 2-1 and the right lower chain wheel 2-2.

As shown in FIG. 3, the limiting structure of the invention is a convex ring 1-11 and a ring groove which are matched with each other. Specifically, a first convex ring is arranged on the side surface of the left upper chain wheel 1-1, which is attached to the right upper chain wheel 1-2, a first annular groove corresponding to the first convex ring is arranged on the right upper chain wheel 1-2, and the first convex ring can be clamped into the first annular groove; a second convex ring is arranged on the side surface of the left lower chain wheel 2-1, which is attached to the right lower chain wheel 2-2, a second annular groove corresponding to the second convex ring is arranged on the right lower chain wheel 2-2, and the second convex ring can be clamped into the second annular groove to enable the left lower chain wheel 2-1 and the right lower chain wheel 2-2 to be tightly matched. Through setting up bulge loop and annular as limit structure, strengthened the stability of sprocket structure.

Further, the shape of the convex ring is an annular protrusion which protrudes from the side surface of the left upper sprocket 1-1 and is coaxial with the hub. The convex ring can be replaced by a linear bulge, a V-shaped bulge and the like.

In one embodiment of the present invention, in order to enhance the adaptability of the sprocket, as shown in fig. 4, the thickness of the drive sprocket is changed by interposing a first adjusting shim 13 between the left upper sprocket 1-1 and the right upper sprocket 1-2 and interposing a second adjusting shim 14 between the left lower sprocket 2-1 and the right lower sprocket 2-2. As shown in fig. 5, the first adjusting shim 13 and the second adjusting shim 14 are both provided with shim gear teeth, which can form finished teeth by matching with the gear teeth 7, so as to avoid gaps in the middle of the gear teeth 7.

Further, the radius of the inside arc surface of the first and second adjusting shims 13 and 14 is the same as the radius of the hub 4.

In order to ensure the installation stability of the adjusting shim, the first adjusting shim 13 and the second adjusting shim 14 can be fixedly connected with the upper chain wheel 1 and the lower chain wheel 2 respectively by using a third bolt and a fourth bolt. The width of the chain wheel can be changed by additionally arranging the adjusting gasket, so that the chain wheel is adaptive to the width of the scraper chain 9, the meshing transmission stability is ensured on the premise of realizing flexible transmission, and meanwhile, the chain is prevented from axially deviating relative to the chain wheel to influence the transmission efficiency.

It is noted that when the upper left sprocket 1-1 and the lower left sprocket 2-1 are provided with the protruding rings, the corresponding protruding rings and the corresponding grooves are provided on the first adjusting shim 13 and the second adjusting shim 14, so as to ensure the normal matching of the sprocket assembly and the adjusting shims.

Example 2

The utility model discloses a concrete embodiment discloses a coal feeder, adopts the combination formula sprocket among the embodiment 1 to carry out the raw coal and carries.

Further, the coal feeder adopts chain drive to carry raw coal, and driven sprocket rotates under drive of drive sprocket, and driven sprocket's structure is the same with drive sprocket's structure, and driven sprocket passes through bolt and wheel hub fixed connection, and wheel hub passes through the bearing and is connected with the driven shaft, realizes driven sprocket's rotation.

Further, the driven sprocket can rotate freely relative to the driven shaft, and the driven sprocket realizes chain transmission with the driving sprocket through the scraper chain 9 and rotates under the driving of the driving sprocket.

Example 3

The utility model discloses a concrete embodiment discloses a method for using combined sprocket, including following step:

step S1: sleeving the hub 4 on the transmission shaft 3;

step S2: fixing an upper chain wheel 1 and a lower chain wheel 2 of a driving chain wheel with a hub 4;

step S3: the scraper chain 9 is sleeved on the driving chain wheel to realize chain transmission.

In the step S1, the hub 4 and the transmission shaft 3 are matched with each other through the connecting key 3-1 and the key slot to realize assembly; further, wheel hub 4 is through interference fit assembly on transmission shaft 3, and no longer dismantles after the assembly, when needing to change the sprocket, only dismantles the sprocket.

In the step S2:

as shown in fig. 2, the left upper chain wheel 1-1 and the right upper chain wheel 1-2 have the same structure and are respectively attached to the left side and the right side of the upper half part of the hub 4; the left upper chain wheel 1-1 and the right upper chain wheel 1-2 are fixedly connected with the hub 4 through a first bolt 11;

specifically, a first bolt 11 sequentially penetrates through a left upper chain wheel 1-1, a hub 4 and a right upper chain wheel 1-2 to fixedly connect the upper chain wheel 1 with the hub 4; and an elastic washer is arranged between the first bolt 11 and the upper chain wheel 1.

Similarly, the lower sprocket 2 is mounted in the same manner as the upper sprocket 1. The left lower chain wheel 2-1 and the right lower chain wheel 2-2 are respectively attached to the left side and the right side of the lower half part of the hub 4; the second bolt 12 sequentially penetrates through the left lower chain wheel 2-1, the connecting hole 5 on the hub 4 and the right lower chain wheel 2-2 to fixedly connect the lower chain wheel 2 with the hub 4.

In the step S2, after the upper left sprocket 1-1 and the upper right sprocket 1-2 are attached, the first bulge loop is clamped into the first annular groove; after the left lower chain wheel 2-1 and the right lower chain wheel 2-2 are jointed, the second convex ring is clamped into the second annular groove.

Further, when the width of the chain wheel needs to be adjusted, a first adjusting shim 13 is clamped between the left upper chain wheel 1-1 and the right upper chain wheel 1-2, and a second adjusting shim 14 is clamped between the left lower chain wheel 2-1 and the right lower chain wheel 2-2. Through increase and decrease adjusting shim, can change the thickness of sprocket, and then can the scraper chain 9 of the different width of adaptation, reach more stable transmission effect.

In the step S3:

when the chain is in transmission, the scraper section 10 on the scraper chain 9 is in surface contact with the arc working surface 8 on the gear teeth 7; the radius of the scraper section 10 is the same as that of the arc working surface 8, when in transmission, the scraper section 10 is clamped into the arc working surface 8, the arc working surface 8 can disperse the impact force of the scraper section 10 on the chain wheel, the chain wheel is protected from being damaged, and the service life is prolonged.

Compared with the prior art, the utility model discloses one of following beneficial effect has at least:

1. the utility model discloses can reduce the work load of changing drive sprocket. The utility model discloses a driving sprocket adopts modular structure, passes through bolted connection by four sprockets (respectively upper left sprocket, upper right sprocket, left lower sprocket, right lower sprocket) and wheel hub and constitutes, that is to say, as long as loosen corresponding bolt, just can take off the sprocket from wheel hub. Therefore, in the actual process, when the gear teeth are worn, the corresponding chain wheel can be conveniently taken down and replaced, the whole driving chain wheel does not need to be disassembled, the bearing does not need to be disassembled, the transmission shaft does not need to be disassembled, and the replacement workload is reduced.

2. The utility model discloses can reduce the cost of changing drive sprocket. In the actual working process, the worn part is mainly on the gear teeth, and the hub is usually not worn. Therefore, the utility model discloses can change the sprocket that has worn and torn very strongly to the pertinence, and other sprockets and wheel hub etc. that do not take place wearing and tearing need not change, so can practice thrift the cost.

3. Sprocket at drive chain pivoted in-process, the contact surface of sprocket and chain is the surface of circular arc working face and scraper blade festival, both have the same radius, consequently realize coinciding completely between circular arc working face and the chain, namely be the face contact between sprocket and the chain, increased area of contact, improved transmission stationarity, reduced the atress intensity, and then can reduce the wear rate of sprocket, prolonged its life.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.

Claims (10)

1. A modular sprocket, comprising: a left upper chain wheel (1-1), a right upper chain wheel (1-2), a left lower chain wheel (2-1), a right lower chain wheel (2-2) and a scraper chain (9); the left upper chain wheel (1-1) and the right upper chain wheel (1-2) can be spliced into an upper chain wheel (1); the left lower chain wheel (2-1) and the right lower chain wheel (2-2) can be spliced into a lower chain wheel (2); the upper chain wheel (1) and the lower chain wheel (2) can be spliced into a chain wheel; the chain wheel and the scraper chain (9) can be in meshed transmission.

2. The modular sprocket as claimed in claim 1, further comprising a hub (4) and a drive shaft (3); the upper chain wheel (1) and the lower chain wheel (2) are sleeved on the upper side and the lower side of the hub (4) respectively and connected through bolts.

3. The combined sprocket wheel according to claim 2, wherein the hub (4) is fitted over the drive shaft (3) and connected thereto by a key groove.

4. The modular sprocket as claimed in claim 3, in which the upper sprocket (1) and the lower sprocket (2) are of symmetrical construction.

5. The combined sprocket as claimed in claim 4, wherein the upper sprocket (1) is provided with a first arc-shaped groove; and a second arc-shaped groove is formed in the lower chain wheel (2).

6. Combined sprocket wheel according to claim 5, wherein the upper half of the hub (4) cooperates with a first arc-shaped groove; the lower half part of the hub (4) is matched with the second arc-shaped groove.

7. The modular sprocket as claimed in claim 2, wherein the upper sprocket (1) is fixedly connected to the hub (4) by means of a first bolt (11); the lower chain wheel (2) is fixedly connected with the hub (4) through a second bolt (12).

8. The combined sprocket wheel according to claim 1, wherein the sprocket wheel is provided with a circular arc working surface (8), the circular arc working surface (8) has the same diameter as the diameter of the flight segments (10) of the flight chain (9), and the circular arc working surface (8) is in surface contact with the flight segments (10).

9. The combined sprocket wheel according to claim 1, wherein the upper sprocket wheel (1) and the lower sprocket wheel (2) are provided with gear teeth (7) which are uniformly distributed in the circumferential direction; when the scraper chain (9) is in meshing transmission with the chain wheel, the scraper section (10) of the scraper chain (9) is clamped between the adjacent gear teeth (7).

10. A coal feeder characterized by the use of a modular sprocket as claimed in any one of claims 1 to 9 for the drive.

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