阅读说明：本技术 采矿用无底链刮板输送机 (Bottom chain-free scraper conveyor for mining ) 是由 张念生 吴立忠 杨学文 唐树峰 张平 闫亚录 饶超 于 2021-05-31 设计创作，主要内容包括：本发明提供的采矿用无底链刮板输送机,属于刮板输送机技术领域,包括：机头、机尾、刮板链、输送槽,机头位于输送槽的一端,机尾位于输送槽的另一端,刮板链位于输送槽的上表面,机头设置第一链轮轴组,机尾设置第二链轮轴组,刮板链包括：刮板组件、链条,刮板组件一端与链条固定连接,刮板组件另一端为自由端,链条与第一链轮轴组、第二链轮轴组啮合形成完整的闭环在输送槽的上方做圆周运动,第二链轮轴组啮合形成完整的闭环平行于输送槽所在的平面,第一链轮轴组、第二链轮轴的轴线垂直于输送槽,链条可以在输送槽内水平运动,将输送槽上的物料输送出去,降低了链条回链所消耗的功率,且刮板输送机不再需要下链道,降低了刮板输送机的高度。(The invention provides a bottom-chain-free scraper conveyor for mining, which belongs to the technical field of scraper conveyors and comprises the following components: aircraft nose, tail, scrape chain, conveyer trough, the aircraft nose is located the one end of conveyer trough, and the tail is located the other end of conveyer trough, scrapes the upper surface that the chain is located the conveyer trough, and the aircraft nose sets up first sprocket shaft group, and the tail sets up second sprocket shaft group, scrapes the chain and includes: scraper blade subassembly, the chain, scraper blade subassembly one end and chain fixed connection, the scraper blade subassembly other end is the free end, chain and first sprocket shaft group, second sprocket shaft group meshing forms complete closed loop and is circular motion in the top of conveyer trough, second sprocket shaft group meshing forms complete closed loop and is on a parallel with the plane at conveyer trough place, first sprocket shaft group, the axis perpendicular to conveyer trough of second sprocket shaft, the chain can be at conveyer trough horizontal motion, carry away the material on the conveyer trough, the power that the chain was back to the chain consumed has been reduced, and scraper conveyor no longer need the lower link way, scraper conveyor's height has been reduced.)

1. A bottomless chain scraper conveyor for mining, comprising: aircraft nose, tail, scrape chain, conveyer trough, the aircraft nose is located the one end of conveyer trough, the tail is located the other end of conveyer trough, it is located to scrape the chain the upper surface of conveyer trough, the aircraft nose sets up first sprocket group, the tail sets up second sprocket group, it includes to scrape the chain: scraper blade subassembly, chain, scraper blade subassembly one end with chain fixed connection, the scraper blade subassembly other end is the free end, the chain with first sprocket shaft group the meshing of second sprocket shaft group forms complete closed loop and is in circular motion is done to the top of conveyer trough, just the chain with first sprocket shaft group the meshing of second sprocket shaft group forms complete closed loop and is on a parallel with the plane at conveyer trough place, first sprocket shaft group the axis perpendicular to of second sprocket shaft the conveyer trough, the chain drives the scraper blade subassembly is in the conveyer trough upward movement will carry away on the conveyer trough.

2. The mining drag chain scraper conveyor of claim 1, wherein the first sprocket shaft set is identical to the second sprocket shaft set.

3. The mining drag chain scraper conveyor of claim 2, wherein the first sprocket shaft set comprises: the scraper assembly comprises an inner gear and an outer gear, the inner gear is meshed with the outer gear, and the outer gear is meshed with the chain, so that the chain drives the scraper assembly to move on the conveying groove.

4. The mining drag chain scraper conveyor of claim 3, wherein the axes of the outer and inner gears are the same and the axes of the outer and inner gears are perpendicular to the trough.

5. The mining drag-less scraper conveyor of claim 4, wherein the head and tail are provided with power parts, the power parts are engaged with the internal gear, and the power parts are used for providing power for the first and second sprocket shaft groups.

6. The bottom-chain-free scraper conveyor for mining of claim 5, wherein the power part is located on any side of the nose and the tail which is not connected with the conveying trough.

7. The mining drag chain scraper conveyor of claim 6, wherein the scraper assembly comprises: the scraper blade body, walking wheel, the one end of scraper blade body with chain fixed connection, the other end of scraper blade body is the free end, the walking wheel is located the lower part of scraper blade body free end, just the walking wheel with the upper surface contact of conveyer trough, the walking wheel supports the scraper blade body slides, improves the smoothness nature of scraper blade body operation.

8. The bottom-chain-less scraper conveyor for mining of claim 7, characterized in that the width of the conveyor trough is more than twice the length of the scraper body.

9. The bottom-chain scraper conveyor for mining of claim 8, wherein the spacing between adjacent scraper bodies is greater than the circumference of the outer gear.

10. The bottom-chain-less scraper conveyor for mining of claim 9, characterized in that the length of the scraper body is smaller than the diameter of the outer gear.

Technical Field

The invention relates to the technical field of scraper conveyors, in particular to a bottom-chain-free scraper conveyor for mining.

Background

As is well known, a coal mine underground fully mechanized mining face is used as a first production site of coal, in the prior art, for example, a chinese patent with patent number 201911030672.6 discloses a mining scraper conveyor, and a chinese patent with patent number 201510627204.2 discloses a scraper conveyor, which mainly includes a scraper arranged on the upper portion of a middle plate, both ends of the scraper are moved together with chains by the pulling force of the chains, so as to scrape materials from one place to another place, thereby realizing the transfer of the materials, and meanwhile, due to the conveying principle of the traditional scraper conveyor, the scraper chain is designed to move back and forth in the circumferential direction in the vertical direction, so that the scraper chain for conveying the materials is mainly the scraper chain of an upper chain channel, the scraper chain in a lower chain channel mainly functions as a return chain, when the scraper conveyor is in operation, the scraper chain in the lower chain channel is completely closed, when the scraper chain is in operation, the chain is broken easily, can't carry out timely maintenance to scraping the scraper chain.

Disclosure of Invention

In view of the above, the invention provides a bottom-chain-free scraper conveyor for mining, which is used for solving the technical problem that a scraper chain is easy to break and cannot be overhauled in time in the operation process of the scraper chain.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a bottomless chain scraper conveyor for mining, comprising: aircraft nose, tail, scrape chain, conveyer trough, the aircraft nose is located the one end of conveyer trough, the tail is located the other end of conveyer trough, it is located to scrape the chain the upper surface of conveyer trough, the aircraft nose sets up first sprocket group, the tail sets up second sprocket group, it includes to scrape the chain: scraper blade subassembly, chain, scraper blade subassembly one end with chain fixed connection, the scraper blade subassembly other end is the free end, the chain with first sprocket shaft group the meshing of second sprocket shaft group forms complete closed loop and is in circular motion is done to the top of conveyer trough, just the chain with first sprocket shaft group the meshing of second sprocket shaft group forms complete closed loop and is on a parallel with the plane at conveyer trough place, first sprocket shaft group the axis perpendicular to of second sprocket shaft the conveyer trough, the chain drives the scraper blade subassembly is in the conveyer trough upward movement will carry away on the conveyer trough.

Preferably, the first set of sprocket shafts is identical to the second set of sprocket shafts.

Preferably, the first sprocket shaft group includes: the scraper assembly comprises an inner gear and an outer gear, the inner gear is meshed with the outer gear, and the outer gear is meshed with the chain, so that the chain drives the scraper assembly to move on the conveying groove.

Preferably, the axes of the external gear and the internal gear are the same, and the axes of the external gear and the internal gear are perpendicular to the conveying groove.

Preferably, the head and the tail are provided with power parts, the power parts are meshed with the inner gear, and the power parts are used for providing power for the first chain wheel shaft group and the second chain wheel shaft group.

Preferably, the power part is positioned on any side of the machine head and the machine tail, which is not connected with the conveying groove.

Preferably, the squeegee assembly comprises: the scraper blade body, walking wheel, the one end of scraper blade body with chain fixed connection, the other end of scraper blade body is the free end, the walking wheel is located the lower part of scraper blade body free end, just the walking wheel with the upper surface contact of conveyer trough, the walking wheel supports the scraper blade body slides, improves the smoothness nature of scraper blade body operation.

Preferably, the width of the trough is greater than twice the length of the flight body.

Preferably, the distance between the adjacent scraper bodies is larger than the circumference of the external gear.

Preferably, twice the length of the scraper body is less than the diameter of the external gear.

As can be seen from the above technical solution, in the bottomless chain scraper conveyor for mining provided by the present invention, the head is located at one end of the conveying trough, the tail is located at the other end of the conveying trough, the scraper chain is located on the upper surface of the conveying trough, the head is provided with a first sprocket shaft group, the tail is provided with a second sprocket shaft group, and the scraper chain includes: scraper blade subassembly, chain, scraper blade subassembly one end with chain fixed connection, the scraper blade subassembly other end is the free end, the chain with first sprocket shaft group the meshing of second sprocket shaft group forms complete closed loop and is in circular motion is done to the top of conveyer trough, just the chain with first sprocket shaft group the meshing of second sprocket shaft group forms complete closed loop and is on a parallel with the plane at conveyer trough place, first sprocket shaft group the axis perpendicular to of second sprocket shaft the conveyer trough, the chain drives the scraper blade subassembly is in the conveyer trough moves on. When the coal cinder falls in the conveyer trough, internal gear rotates and drives the external gear rotates, the external gear with the chain meshes, the chain drives the scraper blade subassembly will coal cinder in the conveyer trough is carried to the aircraft nose from the tail, and then is carried away, the chain can horizontal motion in the conveyer trough has reduced the power that the chain consumed, just no bottom chain scraper conveyor for mining no longer need lower the chain way, has reduced the height of no bottom chain scraper conveyor for mining.

Drawings

Fig. 1 is a front view of a bottomless chain scraper conveyor for mining.

Fig. 2 is a top view of a bottomless chain scraper conveyor for mining.

Figure 3 is a top view of the flight chain run.

Fig. 4 is a front view of the tail.

Fig. 5 is a top view of the tail.

Fig. 6 is a top view of the machine tail (with the coal return cover removed).

Fig. 7 is a first top view of the installation position of the power part at the tail end (the coal return cover is removed).

FIG. 8 is a second top view of the installation position of the power unit at the tail end (with the coal return cover removed).

Fig. 9 is a third plan view of the installation position of the power unit at the tail end (with the coal return cover removed).

Fig. 10 is a front view of the handpiece.

FIG. 11 is a top view of the handpiece.

Fig. 12 is a first top view of the mounting position (scraper chain) of the power part of the nose.

FIG. 13 is a second plan view of the mounting position (scraper chain) of the power unit of the nose.

Fig. 14 is a third plan view of the mounting position (scraper chain) of the power unit of the nose.

Fig. 15 is a left side view of a conveying chute for a scraper conveyor of a comparative example in the related art.

Fig. 16 is a front view of the transfer chute.

Fig. 17 is a plan view of the conveying trough (with the baffle removed).

Fig. 18 is a left side view of the trough.

In the figure: the scraper conveyor comprises a conveying trough 1 for the scraper conveyor in the prior art, a baffle ledge 2 in the prior art, a shovel ledge 3 in the prior art, a shovel plate 31 in the prior art, a middle plate 4 in the prior art and a bottom plate 5 in the prior art.

The mining drag chain scraper conveyor 10, a head 100, a first sprocket shaft group 110, an internal gear 111, an external gear 112, a power part 120, a head frame 130, a first out-link side 131, a first connecting plate 132, a tail 200, a second sprocket shaft group 210, a tail frame body 220, a second out-link side 221, a telescopic chain tightening assembly 222, a moving frame 2221, a detachable cover plate 22211, a telescopic cylinder 2222, a first telescopic cylinder 22221, a first connecting pin hole 222211, a second connecting pin hole 222212, a second telescopic cylinder 22222, a third connecting pin hole 222221, a fourth connecting pin hole 222222, a chute 223, a coal return cover 224, a second connecting plate 225, a scraper chain 300, a scraper assembly 310, a scraper body 311, a traveling wheel 312, a chain 320, a conveying groove 400, a transition groove 410, a middle groove 420, a scraper ledge 421, a scraper 4211, a male connector 42111, a female connector 42112, a first C4212, a dumbbell 422, a pin socket 4221, a baffle 42423, a ledge 4221, a baffle 42423, A second C-shaped groove 4231, a rack rail seat 4232, a rack rail 4233, a push lug 4234, a baffle 4235 and a cable groove 430.

Detailed Description

The technical solutions and effects of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings of the present invention.

Referring to fig. 1-18, a bottomless chain scraper conveyor 10 for mining includes: aircraft nose 100, tail 200, scraper chain 300, conveyer trough 400, aircraft nose 100 is located the one end of conveyer trough 400, tail 200 is located the other end of conveyer trough 400, scraper chain 300 is located the upper surface of conveyer trough 400, aircraft nose 100 sets up first sprocket group 110, tail 200 sets up second sprocket group 210, scraper chain 300 includes: the scraper component 310 and the chain 320, one end of the scraper component 310 is fixedly connected with the chain 320, the other end of the scraper component 310 is a free end, the chain 320 is meshed with the first sprocket shaft group 110 and the second sprocket shaft group 210 to form a complete closed loop to do circular motion above the conveying trough 400, the chain 320 is meshed with the first sprocket shaft group 110 and the second sprocket shaft group 210 to form a complete closed loop to be parallel to the plane of the conveying trough 400, the axes of the first sprocket shaft group 110 and the second sprocket shaft 210 are perpendicular to the conveying trough 400, and the chain 320 drives the scraper component 310 to move on the conveying trough 400 to convey materials on the conveying trough 400; when the coal blocks fall into the conveying groove 400, the inner gear 111 rotates to drive the outer gear 112 to rotate, the outer gear 112 is meshed with the chain 320, the chain 320 drives the scraper component 310 to convey the coal blocks in the conveying groove 400 to the machine head 100 from the machine tail 200, and then the coal blocks are conveyed out, the chain 320 can horizontally move in the conveying groove 400, power consumed by a return chain is reduced, a chain channel is not needed for the mining bottom-chain-free scraper conveyor, and the height of the mining bottom-chain-free scraper conveyor is reduced.

Further, the first sprocket shaft group 110 is the same as the second sprocket shaft group 210, and the first sprocket shaft group 110 includes: the inner gear 111 and the outer gear 112, the inner gear 111 and the outer gear 112 are meshed, the outer gear 112 is meshed with the chain 320, and the chain 320 drives the scraper to move on the conveying groove 400; the tooth part of the outer gear 112 to the shaft part of the outer gear 112 is an inclined surface, so that the tooth part of the outer gear 112 is thin, when the chain 320 drives the scraper body 311 to enter the tail 200 or the nose 100, the scraper body 311 can easily enter the upper surface of the outer gear 112, and the chain 320 is engaged.

Further, the axes of the external gear 112 and the internal gear 111 are the same, and the axes of the external gear 112 and the internal gear 111 are perpendicular to the conveying groove 400; when the scraper chain 300 circularly moves parallel to the upper plane of the conveying groove 400, the axes of the outer gear 112 and the inner gear 111 are perpendicular to the conveying groove 400, and the chain 320 can be well meshed with the outer gear 112.

Further, referring to fig. 3 to 9, the tail 200 includes: the tail frame body 220 is provided with a second chain outlet side 221, the tail frame body 220 is connected to the conveying trough 400 at the second chain outlet side 221, the second chain outlet side 221 is used for the chain 320 to enter and exit, a power part 120 is further arranged on the outer side of the tail frame body 220, the power part 120 is located on any side of the tail frame body 220, which is not the second chain outlet side 221, the power part 120 is provided with a second coupling plate 225, the power part 120 is connected with the tail frame body 220 through the second coupling plate 225, the power part 120 is connected with the inner gear 111 through a worm gear, and the power part 120 is used for providing power for the second sprocket shaft group 210, so that the second sprocket shaft group 210 rotates to drive the scraper chain 300 to normally operate; and the power part 120 can be installed at one side of the power part 120 that can be accommodated by the frame body 220 according to the position of the mine hole, so that the installation of the machine tail 200 at the mine hole is more convenient and can be suitable for different mine holes.

Further, the power unit 120 can be installed at any position on the same side of the frame body 220 according to the position of the mine hole.

Further, the top of tailstock body 220 still sets up flexible tight chain subassembly 222, flexible tight chain subassembly 222 with tailstock body 220 both sides sliding connection, flexible tight chain subassembly 222 with second sprocket shaft group 210 can dismantle the connection, second sprocket shaft group 210 level sets up in tailstock body 220, makes the whole height of tail 200 reduces, is favorable to tail 200 is in the installation of mine opening.

Further, the sliding grooves 223 are symmetrically formed in two sides of the top of the frame body 220, the sliding grooves 223 and the second chain outlet side 221 are not located on the same side, and the sliding grooves 223 are slidably connected with the telescopic chain tightening assembly 222.

Further, the telescopic chain tensioner assembly 222 comprises: a movable frame 2221, a telescopic cylinder 2222, said telescopic cylinder 2222 comprises a first telescopic cylinder 22221, a second telescopic cylinder 22222, the first telescopic cylinder 22221 and the second telescopic cylinder 22222 are respectively positioned at both sides of the moving frame 2221, the movable frame 2221 is slidably connected with the sliding groove 223, the movable frame 2221 is connected with the second sprocket shaft group 210, a first connecting pin hole 222211 and a second connecting pin hole 222212 are arranged at two ends of the first telescopic cylinder 22221, a third connecting pin hole 222221 and a fourth connecting pin hole 222222 are arranged at two ends of the second telescopic cylinder 22222, the first telescopic cylinder 22221 is pinned to the sliding groove 223 and one side of the moving frame 2221 through the first connecting pin hole 222211 and the second connecting pin hole 222212, the second telescopic cylinder 22222 is pinned to the slide groove 223 and the other side of the moving frame 2221 through the third connecting pin hole 222221 and the fourth connecting pin hole 222222; when the scraper chain 300 is relatively loose, the first telescopic cylinder 22221 and the second telescopic cylinder 22222 are started, the first telescopic cylinder 22221 and the second telescopic cylinder 22222 drive the movable frame 2221 to move towards the side far from the second chain outlet side 221, the movable frame 2221 drives the second sprocket shaft group 210 to move towards the side far from the second chain outlet side 221, so that the scraper chain 300 is tensioned, thereby facilitating the operation of the scraper chain 300, if the scraper chain 300 needs to be maintained, the scraper chain 300 needs to be loosened, the first telescopic cylinder 22221 and the second telescopic cylinder 22222 are started, the first telescopic cylinder 22221 and the second telescopic cylinder 22222 drive the movable frame 2221 to move towards the side near the second chain outlet side 221, the movable frame 2221 drives the second sprocket shaft group 210 to also move towards the side near the second chain outlet side, thereby loosening the scraper chain 300, facilitating maintenance of the scraper chain 300.

Further, the movable frame 2221 is provided with a detachable cover plate 22211, and the detachable cover plate 22211 is located at the other end of the tailstock body 220 and is not located on the same side as the second out-link side 221.

Further, a semicircle is arranged in the middle of the detachable cover plate 22211, the radius of the semicircle is the same as the radius of the shaft portion of the external gear 112, the detachable cover plate 22211 is located below the lower portion of the tooth portion of the external gear 112, and when the second sprocket shaft group 210 needs to be maintained, the detachable cover plate 22211 is pulled out from the side away from the second chain outlet side 221, so that the second sprocket shaft group 210 is exposed, and the second sprocket shaft group 210 is detected and maintained.

Further, a coal return cover 224 is arranged at the top of the machine tail frame body 220, the coal return cover 224 is in threaded connection with the machine tail frame body 220, the coal return cover 224 is not in contact with the top of the second sprocket shaft group 210, and the coal return cover 224 prevents coal blocks from falling into the second sprocket shaft group 210 to affect the operation of the second sprocket shaft group 210.

Further, referring to fig. 10 to 14, the handpiece 100 includes: the scraper chain conveying device comprises a machine head frame body 130, wherein the machine head frame body 130 is provided with a first chain outlet side 131, the machine head frame body 130 is connected with the conveying groove 400 at the first chain outlet side 131, the first chain outlet side 131 is used for the chain 320 to enter and exit, the outer side of the machine head frame body 130 is also provided with a power part 120, the power part 120 is positioned at any side of the machine head frame body 130, which is not the first chain outlet side 131, the power part 120 is provided with a first connecting plate 132, the power part 120 is connected with the machine tail frame body 220 through the first connecting plate 132, the power part 120 is connected with the inner gear 111 through a worm gear, and the power part 120 is used for providing power for the first sprocket shaft group 110, so that the first sprocket shaft group 110 rotates to drive the scraper chain 300 to normally operate; and the power part 120 can be installed at one side of the power part 120 that can be accommodated by the frame body 220 according to the position of the mine hole, so that the installation of the machine tail 200 at the mine hole is more convenient and can be suitable for different mine holes.

Further, the power part 120 can be installed at any position according to the position of the mine hole on the same side of the frame body 220

Further, the squeegee assembly 310 includes: scraper blade body 311, walking wheel 312, scraper blade body 311 one end with chain 320 fixed connection, scraper blade body 311's the other end is the free end, walking wheel 312 is located the lower part of scraper blade body 311 free end, just walking wheel 312 with the upper surface contact of conveyer trough 400, walking wheel 312 supports scraper blade body 311 slides, improves scraper blade body 311 smooth operation nature. When one end of the scraper body 311 is fixed and the other end is a free end, the scraper body 311 moves forward along with the chain 320, the walking wheels 312 reduce the resistance of the free end of the scraper body 311, the scraper body runs smoothly, and the two ends of the scraper body 311 can walk simultaneously, that is, the scraper body 311 always keeps walking perpendicular to the chain 320, so that materials can be conveyed and removed as far as possible in the process of conveying the materials by the scraper.

Further, the width of the conveying groove 400 is greater than twice the length of the scraper body 311; so that the scraper chain 300 on the conveying trough 400 can normally operate.

Further, the distance between the adjacent scraper bodies 311 is greater than the circumference of the external gear 112, and when the scraper body 311 rotates on the first sprocket shaft group 110 or the second sprocket shaft group 210, there is only one scraper assembly 310, so as to prevent the plurality of scraper assemblies 310 from rotating on the first sprocket shaft group 110 and the second sprocket shaft group 210, which affects the normal operation of the scraper.

Further, twice the length of the scraper body 311 is smaller than the diameter of the external gear 112; when the chain 320 returns to the conveying groove 400, and the chain 320 circularly moves parallel to the upper plane of the conveying groove 400, the scraper bodies 311 of the chain 320 in the processes of conveying materials and returning chains do not affect each other when the chain 320 circularly moves.

Further, the length of the scraper body 311 is smaller than the diameter of the external gear 112.

Further, referring to fig. 2, 16 to 18, the conveying trough 400 includes: the transition groove 410, the middle groove 420, the cable groove 430, and the first outgoing side 131 are connected to one end of the transition groove 410, one end of the transition groove 410 is connected to one end of the middle groove 420, the other end of the middle groove 420 is connected to one end of another transition groove 410, one end of another transition groove 410 is connected to the second outgoing side 221, the middle grooves 420 are connected to form a coal conveying rail, and the cable grooves 430 are connected to be disposed on one side of the middle groove 420.

Further, the middle groove 420 includes: the scraper chain conveying device comprises a scraper ledge 421, a supporting plate 422 and a baffle ledge 423, wherein the scraper ledge 421 is connected with one end of the supporting plate 422, the other end of the supporting plate 422 is connected with the baffle ledge 423, and the upper surface of the supporting plate 422 provides a running space for the scraper chain 300 to convey materials. The scraper chain 300 moves horizontally on the upper surface of the supporting plate 422, the chain 320 is not easy to be broken in the operation process of the scraper chain 300, the scraper chain 300 can be checked on the upper surface of the supporting plate 422, once the scraper chain 300 is broken, the scraper chain can be directly maintained on the upper surface of the supporting plate 422, and the operation is convenient; and the height of the middle groove 420 is remarkably reduced, thereby saving casting materials.

Further, a shovel plate 4211 is further arranged on the shovel plate ledge 421, the shovel plate 4211 and the supporting plate 422 are not on the same horizontal plane, and an included angle of 0-10 degrees is formed between the lower plane of the scraping plate and the extension line of the lower plane of the supporting plate 422, so that the conveying trough 400 is more flexible in the turning process.

Further, one end of the shovel plate 4211 is provided with a male connector 42111, the other end of the shovel plate 4211 is provided with a female connector 42112, and the conveying groove 400 is connected with the front and rear connecting grooves through the male connector 42111 and the female connector 42112, so that the connection is more convenient and tight.

Further, a first C-shaped groove 4212 is arranged inside the shovel board ledge 421, the shape of the first C-shaped groove 4212 can be adapted to the end of the scraper chain 300, the bottom of the first C-shaped groove 4212 is connected with one end of the supporting plate 422 far away from the baffle ledge 423, one end of the scraper chain 300 is pressed by the upper portion of the first C-shaped groove 4212, the scraper chain 300 is prevented from being separated from the upper portion of the supporting plate 422, the upper portion of the first C-shaped groove 4212 is short, abrasion of the scraper chain 300 on the upper portion of the first C-shaped groove 4212 is reduced, and the service life of the scraper chain is prolonged.

Further, dumbbell pin sockets 4221 are respectively arranged in the width direction of the supporting plate 422, so that the middle grooves 420 can be conveniently connected.

Furthermore, two rack rail seats 4232 are arranged at the upper part of the baffle ledge 423, and the rack rail seats 4232 are located on the upper end face of the baffle ledge 423.

Further, a second C-shaped groove 4231 is arranged on the inner side of the baffle ledge 423, the upper end of the second C-shaped groove 4231 is connected with one end of the baffle 4235, the bottom of the second C-shaped groove 4231 is connected with one end of the supporting plate 422 far away from the shovel ledge 421, the other end of the scraper chain 300 is pressed by the upper portion of the second C-shaped groove 4231, the scraper chain 300 is prevented from being separated from the upper portion of the supporting plate 422, the upper portion of the second C-shaped groove 4231 is short, abrasion of the scraper chain 300 on the upper portion of the second C-shaped groove 4231 is reduced, and the service life of the scraper chain is prolonged.

Further, the second C-shaped groove 4231 is the same as the first C-shaped groove 4212 in shape.

Further, the length of the baffle 4235 is less than one third of the width of the supporting plate 422, the cross section of the baffle 4235 is trapezoidal, and when the scraper chain 300 moves to the position near the baffle ledge 423 for chain return, the baffle 4235 can prevent a small amount of coal blocks falling off during the operation process of the coal mining machine from entering a chain return channel, so that the operation of the scraper chain 300 is affected. And the included angle between the baffle 4235 and the extension line of the upper end of the second C-shaped groove 4231 is 0-10 degrees, so that the dropped coal blocks can slide down from the middle part of the supporting plate 422, and the coal blocks can be conveniently conveyed out by the scraper chain 300.

Further, a rack 4233 is further arranged on the upper end face of the baffle ledge 423, the rack 4233 is installed on the rack seat 4232, and a walking track is provided for the walking of the coal mining machine.

Further, a push ear 4234 is arranged on the side surface of the baffle ledge 423.

For ease of understanding, this will be further illustrated by the following comparative examples.

Comparative example:

referring to fig. 15, in the prior art, a chinese invention patent, such as patent No. CN201310257684.9, discloses a middle trough and a scraper conveyor 1 having the middle trough, which includes a prior art shovel ledge 3, a prior art baffle ledge 2, a prior art bottom plate 5, a prior art middle plate 4, the prior art shovel ledge 3, the prior art baffle ledge 2, the prior art bottom plate 5, the prior art middle plate 4, and a prior art pushing lug connected together by welding; the middle groove in the prior art also comprises a bottom plate 5, the whole height of the middle groove is high, more materials are lost in casting and cannot be used in a short mine hole, a scraper chain surrounds the whole middle plate in the operation process, the scraper chain is not easy to detect and is easy to break, and the scraper chain is not easy to maintain after being broken; and the shovel board and the bottom plate among the prior art are located same horizontal plane, and the middle part groove collides easily at the in-process of turning, leads to the easy wearing and tearing of shovel board among the prior art.

The middle trough 420 of the bottom-chain-free scraper conveyor for mining of the present invention comprises: the scraper chain scraper comprises a scraper ledge 421, a supporting plate 422 and a baffle ledge 423, wherein the scraper ledge 421 is connected with one end of the supporting plate 422, the other end of the supporting plate 422 is connected with the baffle ledge 423, the baffle ledge 423 is connected with a baffle 4235, one end of the baffle 4235 is connected with the baffle ledge 423, the other end of the baffle 4235 is a free end, the upper surface of the supporting plate 422 is a scraper chain 300 running space, and the baffle 4235 can prevent a small amount of coal blocks falling off during the running process of a coal mining machine from entering a chain return channel to influence the running of the scraper chain 300. The invention has no bottom plate in the prior art, and the height of the baffle ledge 423 and the shovel board ledge 421 is reduced by one third to one half compared with the prior art, so that the height of the whole conveying trough 400 is reduced, the conveying trough can adapt to shorter mine holes, materials can be saved in the casting process, the weight of the cast conveying trough 400 is obviously reduced, and the supporting plate 422 selects the predetermined thickness according to the conveyed coal quantity and the size of the scraper chain 300, so that the conveying trough can meet the strength of material transportation; in the invention, the scraper chain 300 moves horizontally on the upper surface of the supporting plate 422, the scraper chain 300 is not easy to be broken in the running process of the scraper chain 300, the scraper chain 300 can be checked on the upper surface of the supporting plate 422, once the scraper chain 300 is broken, the scraper chain can be directly maintained on the upper surface of the supporting plate 422, and the operation is convenient; according to the invention, the lower surface of the shovel plate 4211 and the lower surface of the supporting plate 422 form a certain included angle, so that the conveying trough 400 is more flexible in the turning process, and the abrasion between the shovel plates 4211 is reduced.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.