Coal control and safety protection device for unequal-length coal sliding ports of coal face of thin seam

Abstract

The utility model relates to a coal control and safety protection device for an unequal-length coal chute of a coal face of a thin seam, which is arranged at the coal chute of the coal face. The baffle is composed of a fixed baffle and a movable baffle, and the movable baffle is hinged to the fixed baffle so that the movable baffle can deflect relative to the fixed baffle. The fixed baffle is installed on the scraper conveyor, and the movable baffle is arranged at the front end of the scraper conveyor. The movable baffle is composed of a main movable plate and a telescopic plate arranged on the back face of the main movable plate. The deflection action of the movable baffle and the telescopic action of the telescopic plate are driven by the telescopic push rod. When the scraper conveyor and the coal sliding port are staggered, the movable baffle can be adjusted to change the coal falling direction, so that the falling coal directly faces the coal sliding port, and the coal control effect is achieved. If the tail end of the scraper conveyor is too far away from the coal sliding port or the caliber of the coal sliding port is too large, the telescopic plate can stretch out, and control over the coal sliding port is kept.

Description

TECHNICAL FIELD

[0001] The present technology relates to a coal mining device, in particular, a coal mining face of a thin coal seam unequal length coal chute control and safety protection device. BACKGROUND

[0002] In the steeply inclined coal mining face, the gob-side entry retaining mining technology without coal pillar can mine the coal face completely and improve the working efficiency and the yield after the coal is mined completely while excavating one less roadway. The gob-side entry retaining mining technology without coal pillar needs to set the supports on the roadway upper side and set a coal chute between the supports every 2 meters in the roadway.

[0003] The scraper conveyor is arranged along the coal mining face with an inclination greater than 45 degrees, the coal in the coal mining face is conveyed downward along the scraper conveyor, and the coal is conveyed out of the coal chute at the lower end of the coal mining face and falls on the bridge-type transfer machine and then is transported out.

[0004] However, as the coal mining face advances forward, the scraper conveyor is displaced, the scraper conveyor is misaligned with the coal chute (for example, the end of the scraper conveyor is just between two coal chutes), the coal conveyed downward by the scraper conveyor cannot flow out of the coal chute smoothly, and the coal is accumulated in the coal chute, which causes the coal chute to be blocked. Frequent blocking not only slows down the coal mining efficiency, but also makes the unblocking work more dangerous, and the suddenly collapsed coal during the cleaning of the coal chute also poses a safety threat to the workers.

[0005] Alternatively, due to the unequal length of the coal chute (the diameter is long or short), when the diameter becomes long, the coal conveyed out of the coal chute cannot be well gathered together, but is scattered and falls, and cannot be well fallen on the bridge-type transfer machine.

[0006] Therefore, the above two problems should be solved. CONTENT OF THE UTILITY MODEL

[0007] In order to solve the above technical problems, the utility model provides a thin coal seam coal mining face unequal length coal chute control and safety protection device.

[0008] The utility model is arranged in the coal chute of the coal mining face.

[0009] The utility model includes a fixed baffle arranged at the lower end of the coal mining face and parallel to the coal mining face, and an active baffle hinged to the fixed baffle is arranged at the side of the fixed baffle.

[0010] An adjusting and fixing device for adjusting and fixing the included angle formed by the active baffle and the fixed baffle is arranged.

[0011] The side of the active baffle away from the fixed baffle is a variable side, and the length of the active baffle can be changed along the variable side.

[0012] The thin coal seam mining face unequal length coal passageway control coal and safety protection device, wherein the height of the fixed baffle and the movable baffle is at least 80% of the height of the mining face.

[0013] The thin coal seam mining face unequal length coal passageway control coal and safety protection device, wherein the fixed baffle is installed on the side of the end section of the scraper conveyor at the lower end of the mining face; specifically, it is installed on the side of the cable rack of the scraper conveyor.

[0014] After the fixed baffle is fixed on the scraper conveyor, the hinge between the movable baffle and the fixed baffle is close to the end face of the end section of the scraper conveyor.

[0015] The lower edge of the fixed baffle is installed on one side of the scraper conveyor, and the upper edge is opposite to the lower edge; the coal blocking face of the movable baffle and the fixed baffle is close to one side of the scraper conveyor, and the back face is opposite to the coal blocking face.

[0016] The thin coal seam mining face unequal length coal passageway control coal and safety protection device, wherein the fixed baffle comprises a main structure plate hinged with the movable baffle.

[0017] The thin coal seam mining face unequal length coal passageway control coal and safety protection device, wherein a height increasing plate is detachably connected to the upper edge of the main structure plate.

[0018] The thin coal seam mining face unequal length coal passageway control coal and safety protection device, wherein a split type connecting gangue blocking plate is arranged on the side of the main structure plate away from the movable baffle; the height and the length of the split type connecting gangue blocking plate are adjustable.

[0019] The thin coal seam mining face unequal length coal passageway control coal and safety protection device, wherein the lower edge of the split type connecting gangue blocking plate is fixed to the side of the cable rack of the scraper conveyor through one of a bolt and nut structure and a buckle, and the edge of the split type connecting gangue blocking plate adjacent to the main structure plate is fixed to the side of the main structure plate through one of a bolt and nut structure and a buckle.

[0020] The split type connecting gangue blocking plate is composed of a plurality of small plate blocks, and a connecting clamp plate is arranged on the back face of the split type connecting gangue blocking plate to splice the plurality of small plate blocks, and each small plate block is fixed to the connecting clamp plate through a bolt.

[0021] The thin coal seam mining face unequal length coal passageway control coal and safety protection device, wherein the adjusting and fixing device comprises:

[0022] (1). a first telescopic push rod arranged between the back faces of the movable baffle and the fixed baffle, the back faces of the movable baffle and the fixed baffle are respectively provided with a swing angle hinge seat, and the end and the tail of the first telescopic push rod are respectively hinged to the swing angle hinge seats.

[0023] (2). In the variable side edge of the movable baffle, a second telescopic push rod is fixedly arranged; the axis of the second telescopic push rod is parallel to the variable side edge of the movable baffle, the second telescopic push rod is telescopic in the direction of the lower edge, and a supporting leg is arranged at the lower end of the second telescopic push rod.

[0024] The thin coal seam mining face unequal length coal pass-through control and safety protection device, wherein the movable baffle is length-variable along the variable side, and specifically:

[0025] The movable baffle is composed of a main movable plate on a coal blocking surface and a telescopic plate on the back of the main movable plate.

[0026] The back of the main movable plate is provided with a frame for buckling the telescopic plate and limiting the telescopic plate to move only along the variable side, and the frame serves as a slide rail of the telescopic plate.

[0027] A third telescopic push rod is arranged, one end of the third telescopic push rod is fixed to the frame, the other end of the third telescopic push rod is fixed to the telescopic plate, and the third telescopic push rod is perpendicular to the variable side.

[0028] The thin coal seam mining face unequal length coal pass-through control and safety protection device, wherein the lower edge of the main movable plate and the telescopic plate is detachably connected with an extension blocking block, and the upper edge of the main movable plate is detachably connected with a height increasing plate.

[0029] The thin coal seam mining face unequal length coal pass-through control and safety protection device, wherein the lower edge of the main movable plate and the telescopic plate is detachably connected with an extension blocking block, and the upper edge of the main movable plate is detachably connected with a height increasing plate.

[0030] The thin coal seam mining face unequal length coal pass-through control and safety protection device, wherein the lower edge of the main movable plate and the telescopic plate is detachably connected with an extension blocking block, and the upper edge of the main movable plate is detachably connected with a height increasing plate.

[0031] The thin coal seam mining face unequal length coal pass-through control and safety protection device, wherein the lower edge of the main movable plate and the telescopic plate is detachably connected with an extension blocking block, and the upper edge of the main movable plate is detachably connected with a height increasing plate.

[0032] The thin coal seam mining face unequal length coal pass-through control and safety protection device, wherein the lower edge of the main movable plate and the telescopic plate is detachably connected with an extension blocking block, and the upper edge of the main movable plate is detachably connected with a height increasing plate.

[0033] The thin coal seam mining face unequal length coal pass-through control and safety protection device, wherein the lower edge of the main movable plate and the telescopic plate is detachably connected with an extension blocking block, and the upper edge of the main movable plate is detachably connected with a height increasing plate. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a coal mining face layout schematic diagram of the utility model;

[0035] Figure 2 is a structural diagram of the device of the utility model;

[0036] Figure 3 is a top view of the structural schematic diagram of the utility model;

[0037] Figure 4 is another angle view of the structural schematic diagram of the utility model, which shows the "coal blocking face" and the scraper conveyor.

[0038] Among them: the coal control and safety protection device 1 of the utility model; the scraper conveyor 2; the bridge type transfer machine 3; the roadway support 4; the coal chute 5; the coal mining machine lane 6;

[0039] the swing angle hinge base 10; the first telescopic push rod 11; the main structure plate 12; the telescopic plate 13; the third telescopic push rod 14; the supporting leg 15; the second telescopic push rod 16; the height increasing plate 17; the height increasing plate base 18; the connecting clamp plate 19; the split type connecting gangue blocking plate 20; the main movable plate 21. DETAILED DESCRIPTION

[0040] The description of the example orientation:

[0041] With the scraper conveyor 2 as the reference, one face of the utility model facing the scraper conveyor is the "front" face of the utility model, that is, the "coal blocking face"; one face of the utility model facing away from the scraper conveyor is the "rear" face of the utility model.

[0042] The side edge installed on the scraper conveyor is the "lower" edge, and the other side edge opposite to the lower edge is the "upper" edge.

[0043] The upper edge of the utility model is connected to the roof of the coal mining face (referring to being connected to the roof of the coal mining face) or is close to the roof of the coal mining face; the lower edge of the utility model is close to the floor of the coal mining face.

[0044] Reference Figure 1 The along-gob roadway retaining mining technology without coal pillar needs to set the roadway support 4 on the upper side of the roadway and set a coal chute 5 between the roadway supports 4 every about 2 meters in the roadway.

[0045] Reference Figure 1 The coal control and safety protection device 1 of the utility model is arranged at the coal chute 5 of the coal mining face, and the coal chute 5 is on the upper side of the roadway of the coal mining machine lane 6. The coal chute is a connecting port connecting the coal mining face and the machine lane 6, and the coal falling from the scraper conveyor 2 of the coal mining face falls out from the coal chute, and the bridge type transfer machine 3 is below the coal chute. The height of the coal chute is along with the height of the coal mining face (for example, the mining height of the thin coal seam is 700-1500 mm), and the width is 2-4 meters.

[0046] The utility model discloses a coal control and safety protection device for the coal face, which is installed at the lower end of the coal face and is connected to the last section of the scraper conveyor.

[0047] The utility model discloses a coal control and safety protection device for the coal face, which is installed at the lower end of the coal face and is connected to the last section of the scraper conveyor.

[0048] Reference Figures 2-4 The fixed baffle is installed at the end of the scraper conveyor on the side of the cable rack of the scraper conveyor. The lower end of the main structure plate 12 in the fixed baffle is adapted to the cable rack on the side of the scraper conveyor. The middle part of the scraper conveyor is a groove, and the two sides of the groove are convex bosses. Boltholes are arranged on the convex bosses. The main structure plate 12 is correspondingly provided with lag bolt holes. The main structure plate 12 can be fixed on the scraper conveyor 2 through the bolt and nut structure. Of course, the installation mode can also be other modes, for example, the lower edge of the main structure plate is provided with a bolt, and the convex boss is provided with a bolt hole. The main structure plate can be fixed by the bolt mode, which is convenient for installation and removal. Even welding mode can be used. Of course, the bolt and nut structure installation connection mode is preferred in the example.

[0049] The main structure plate 12 bears an important and large load. In the example, the main structure plate uses square steel as the frame body of the main structure plate. The frame body is longitudinally and transversely arranged. A steel plate with a thickness of at least 5 mm-10 mm is installed on the frame body. The main structure plate is fixed on the part of the scraper conveyor. More frame bodies and thicker steel plates are used.

[0050] Reference Figure 2 The split type connection gangue baffle 20 is mainly used for extending the main structure plate and extending the shielding range of the main structure plate. The extension direction is the direction of the upper section of the scraper conveyor (the opposite direction of the end of the scraper conveyor). The split type connection gangue baffle 20 is detachably connected with the main structure plate 12 and is detachably installed on the convex boss of the scraper conveyor 2. The split type connection gangue baffle is not necessary. It is protected in the side direction of the scraper conveyor. The impact of gangue in this direction is not much. Therefore, whether to install it is determined according to the situation. The protection in the extension direction of the upper section of the scraper conveyor helps to prevent the gangue from being out of control and helps to protect the equipment (such as the hydraulic support) on the side of the end section of the scraper conveyor and the workers there.

[0051] The height and length of the split type connecting gangue blocking plate 20 can be adjusted, specifically, the lower edge of the split type connecting gangue blocking plate is fixed to the cable rack side of the scraper conveyor, and the installation mode of the split type connecting gangue blocking plate is the same as that of the main structure plate, the lower end of the split type connecting gangue blocking plate is correspondingly provided with a rivet hole, and the split type connecting gangue blocking plate can be fixed to the scraper conveyor through a bolt and nut structure. Of course, the installation mode can also be other modes, for example, the lower edge is provided with a bolt, and the boss is provided with a hole, and the split type connecting gangue blocking plate can be fixed in the bolt mode.

[0052] The split type connecting gangue blocking plate 20 is connected (detachably connected) with the main structure plate 12, and is fixed through a bolt and nut structure, or a buckle, or a bolt and socket mode. In this example, the bolt and nut structure is used for connection.

[0053] The split type connecting gangue blocking plate itself is composed of a plurality of small plates, in this example, four steel plates with a thickness of 5-10 mm are used, the upper two and the lower two (according to the site conditions, the upper two are installed and removed, so that the height of the split type connecting gangue blocking plate is increased or decreased; and the left two are installed and removed, so that the length of the split type connecting gangue blocking plate is extended or shortened).

[0054] In order to splice the small plates, a connecting clamp plate 19, that is, a strip-shaped steel plate, is arranged on the back of the small plates, and is connected between the small plates, and the small plates are fixed to the connecting clamp plate 19 through bolts, and the connecting clamp plate pulls the small plates together, so as to form a fixed connection.

[0055] Reference Figure 2 , Figure 4 The upper edge of the fixed blocking plate is preferably connected to the roof of the coal mining face, and at least the main structure plate 12 is close to the roof of the coal mining face, so as to prevent gangue from flowing; therefore, the height of the main structure plate is at least 80% of the height of the coal mining face. For this purpose, an increased plate seat 18 is arranged on the upper edge of the main structure plate 12, and a row of bolt holes are arranged on the increased plate seat 18, which are used as increased height spare bolt holes. An increased plate 17 is detachably connected to the main structure plate, and the increased plate 17 with a suitable height is made according to the site environment, and is installed on the increased plate seat.

[0056] The length of the main structure plate is 1.5 meters, and the length of the split type connecting gangue blocking plate is 1.5 meters.

[0057] Reference Figure 2 The movable blocking plate is hingedly connected to the side edge of the fixed blocking plate, specifically, is hingedly connected to the side edge of the main structure plate, a hinge seat is installed on the rear side edge of the main structure plate, a hinge lug is installed on the rear side edge of the movable blocking plate, and the hinge is located at a distance of 200-400 mm from the end face of the end section of the scraper conveyor.

[0058] The adjusting and fixing device is used to adjust the included angle formed by the movable baffle and the fixed baffle, and fix the state of the adjusted movable baffle. The edge of the movable baffle is always close to the coal chute.

[0059] Therefore, the adjusting and fixing device in the example comprises two parts of adjusting and fixing, and the adjusting part is used to adjust the included angle formed by the movable baffle and the fixed baffle, and the fixed part is used to fix the state of the adjusted movable baffle. Figures 2-4 .

[0060] The adjusting part specifically comprises a swing angle hinge base 10 and a first telescopic push rod 11.

[0061] The two swing angle hinge bases are respectively arranged on the back surfaces of the movable baffle and the fixed baffle. The swing angle hinge base 10 is a boss protruding from the back surface of the movable baffle and the fixed baffle. The protruding height is as large as possible (in the example, the protruding height is at least 200 mm), so that the swing angle of the movable baffle is as large as possible (otherwise, the middle section of the first telescopic push rod is abutted on the vertex of the included angle when the movable baffle is swung by a small angle). In the example, the swing angle of the movable baffle is required to reach 45 degrees (the included angle formed between the movable baffle and the virtual extension line of the fixed baffle).

[0062] The end and tail of the first telescopic push rod 11 are respectively hinged to the swing angle hinge base 10. When the end of the first telescopic push rod is extended, the movable baffle is pushed, and the movable baffle is swung with the center of the hinge joint between the fixed baffle and the movable baffle as the center.

[0063] The first telescopic push rod 11 is a hydraulic cylinder, and the oil supply is from the hydraulic support liquid supply system of the coal mining face.

[0064] The fixed part is a second telescopic push rod 16.

[0065] Of course, the movable baffle can be fixed by the oil cylinder lock of the first telescopic rod, but the movable baffle is continuously impacted by the coal flow, and the impact resistance of the movable baffle fixed by the oil cylinder lock of the first telescopic rod is weak.

[0066] The second telescopic push rod 16 is arranged on the side edge of the movable baffle, specifically on the edge of the telescopic plate 13, and moves with the telescopic plate. When the swing angle of the movable baffle is adjusted and the extension amount of the telescopic plate is adjusted, the second telescopic rod is extended downward, and the lower end foot 15 stands on the floor of the coal mining face to complete the bottom connection, so that the movable baffle is fixed.

[0067] Therefore, the axis of the second telescopic push rod 16 is parallel to the side edge of the telescopic plate, the telescopic direction is toward the floor of the coal mining face, the second telescopic push rod is telescoped toward the lower edge (the floor of the coal mining face), the lower end of the second telescopic push rod is provided with a foot 15 for finally connecting the bottom, and the upper end is fixed with the side edge of the telescopic plate. The second telescopic push rod is a hydraulic cylinder, and the oil supply is from the hydraulic support liquid supply system of the coal mining face.

[0068] When the end of the scraper conveyor 2 is too far from the coal chute 5, or the diameter of the coal chute 5 is too large, the movable baffle needs to be lengthened; otherwise, the movable baffle needs to be shortened; the edge of the movable baffle is always close to the coal chute.

[0069] Therefore, the side away from the fixed baffle of the movable baffle is a variable side, and the length of the movable baffle can be changed along the variable side.

[0070] Therefore, the movable baffle is provided with a main movable plate 21 and a telescopic plate 13. The main movable plate 21 is hinged to the main structure plate 12, and the telescopic plate 13 is installed on the back of the main movable plate 21 (the main movable plate is on the coal blocking surface).

[0071] The back of the main movable plate 21 is provided with a frame, which has three functions: one is to strengthen the structure of the main movable plate; the second is to install a swing angle hinge seat; the third is to install the telescopic plate and limit the telescopic movement of the telescopic plate only along the variable side, and the frame acts as a sliding rail for the telescopic plate. Specifically, the main movable plate 21 is provided with track grooves at the upper and lower edges close to the edge, and the upper and lower edges of the telescopic plate are inserted into the track grooves to realize sliding; the main movable plate is also provided with a longitudinal frame, which is about 300 mm away from the hinge between the movable baffle and the fixed baffle, for limiting the position of the telescopic plate when it is retracted, and for installing the swing angle hinge seat.

[0072] The extension and retraction of the telescopic plate is driven by the third telescopic push rod 14, one end of which is fixed to the main movable plate (specifically, the frame of the main movable plate), and the other end is fixed to the telescopic plate, and the installation direction of the third telescopic push rod is perpendicular to the variable side. The third telescopic push rod 14 is a hydraulic oil cylinder, and the oil supply comes from the hydraulic support supply system of the coal mining face.

[0073] The first telescopic push rod, the second telescopic push rod and the third telescopic push rod can only be installed on the back, because the front is impacted by the coal flow.

[0074] A height increasing plate is detachably connected to the upper edge of the main movable plate.

[0075] The main movable plate adopts square steel as the frame body, which is longitudinally and transversely arranged, and the frame bodies are filled with 5mm-10mm steel plates. The frame body of the telescopic plate adopts smaller square steel than the main movable frame body, and is filled with 5mm-10mm steel plates.

[0076] The length of the main movable plate 21 is 2 meters, and the length of the telescopic plate is 1.5 meters; the extendable length is at least 1 meter.

[0077] The upper edge of the movable baffle is preferably connected to or close to the roof of the coal mining face to prevent the gangue from leaking; therefore, a row of bolt holes are arranged on the upper edge of the main movable plate and the telescopic plate, which are used as spare bolt holes for increasing the height, and a height increasing plate is detachably connected to the bolt holes, and the height increasing plate with a suitable height is made according to the site environment and installed on the bolt holes.

[0078] The lower edge of the main movable plate and the telescopic plate is detachably connected with an extension baffle for connecting to the floor, and the extension baffle is made of soft material such as waste transport belt and is fixed to the lower edge of the main movable plate and the telescopic plate through a bolt and nut structure.

[0079] The above is an exemplary description of the utility model, which does not represent the protection scope of the utility model.

Claims

1. A coal control and safety protection device for uneven length coal chute of thin seam coal mining face, which is arranged at the coal chute of the coal mining face, characterized in that, a fixed baffle is arranged at the lower end of the coal mining face and parallel to the coal mining face; and a movable baffle is arranged at the side of the fixed baffle and hinged to the fixed baffle; an adjusting and fixing device is arranged for adjusting and fixing the included angle formed by the movable baffle and the fixed baffle; the side of the movable baffle away from the fixed baffle is a variable side, and the length of the movable baffle can be changed along the variable side.

2. The unequal-length coal-drawing opening coal control and safety protection device for a thin-seam coal face according to claim 1, characterized in that, The height of the fixed baffle and the movable baffle is at least 80% of the height of the coal mining face.

3. The thin seam coal mining face unequal length coal caving mouth coal control and safety protection device of claim 1, wherein, The fixed baffle is installed on the side of the terminal segment of the scraper conveyor at the lower end of the coal mining face; specifically, the fixed baffle is installed on the side of the cable rack of the scraper conveyor; After the fixed baffle is fixed on the scraper conveyor, the hinge part of the movable baffle and the fixed baffle is close to the end face of the terminal segment of the scraper conveyor; one side of the fixed baffle installed on the scraper conveyor is the lower edge, and the other side opposite to the lower edge is the upper edge; the movable baffle and the fixed baffle take the side close to the scraper conveyor as the coal blocking face, and the other side opposite to the coal blocking face is the back face.

4. The thin seam coal face unequal length coal spilling mouth coal control and safety protection device of claim 3, characterized in that, The fixed baffle comprises a main structure plate hinged to the movable baffle.

5. The device for controlling coal and protecting safety of unequal length chutes in thin coal seam mining working face according to claim 4, characterized in that: An extension plate is detachably connected to the upper edge of the main structure plate.

6. The unequal length coal spilling gate coal control and safety protection device for thin seam coal mining face according to claim 4, characterized in that, A split type connecting gangue blocking plate is arranged on the side of the main structure plate away from the movable baffle; the height and length of the split type connecting gangue blocking plate can be adjusted.

7. The unequal length coal spilling gate coal control and safety protection device for thin seam coal mining face according to claim 6, characterized in that, The lower edge of the split type connecting gangue blocking plate is fixed to the side of the cable rack of the scraper conveyor by one of a bolt and nut structure and a buckle, and the edge of the split type connecting gangue blocking plate adjacent to the main structure plate is fixed to the side of the main structure plate by one of a bolt and nut structure and a buckle. The split type connecting gangue blocking plate is composed of a plurality of small plate blocks, and the back face of the split type connecting gangue blocking plate is provided with a connecting clamp plate for splicing the plurality of small plate blocks, and each small plate block is fixed to the connecting clamp plate by a bolt.

8. The unequal length coal spilling gate coal control and safety protection device for thin seam coal mining face according to claim 4, characterized in that, The adjusting and fixing device comprises: a first telescopic push rod arranged between the back faces of the movable baffle and the fixed baffle, the back faces of the movable baffle and the fixed baffle are respectively provided with a swing angle hinge seat, and the end and tail of the first telescopic push rod are respectively hinged to the swing angle hinge seats; a second telescopic push rod is fixedly arranged at the variable side edge of the movable baffle; the axis of the second telescopic push rod is parallel to the variable side edge of the movable baffle, the second telescopic push rod telescopes downward, and the lower end of the second telescopic push rod is provided with a supporting leg.

9. The thin seam coal face unequal length coal spilling mouth coal control and safety protection device of claim 1, wherein, The length of the movable baffle can be changed along the variable side, specifically, the movable baffle is composed of a main movable plate on the coal blocking face and a telescopic plate on the back face of the main movable plate; the back face of the main movable plate is provided with a frame for clamping the telescopic plate and limiting the telescopic plate to move only along the variable side, and the frame serves as a slide rail of the telescopic plate; a third telescopic push rod is arranged with one end fixed to the frame and the other end fixed to the telescopic plate, and the third telescopic push rod is perpendicular to the variable side.

10. The unequal length coal spilling gate coal control and safety protection device for thin seam coal mining face according to claim 9, characterized in that, An extension blocking block is detachably connected to the lower edge of the main movable plate and the telescopic plate; an extension plate is detachably connected to the upper edge of the main movable plate.

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