Scraper conveyer and control method thereof

Abstract

The scraper conveyor comprises a mounting frame, a conveying bin is mounted at the top end of the mounting frame, a feeding pipe is mounted above one end of the conveying bin, a discharging opening is formed below the other end of the conveying bin, a transmission shaft in the conveying bin is connected with a chain in a sleeving mode, and a scraper is mounted at the side end of the chain; and a flow monitor is mounted in the feeding pipe. According to the conveying device, through the arrangement of the scraper, the flow monitor, the electric push rod, the electromagnet, the extension plate and the extension locking mechanism, the length of the scraper can be adjusted according to the flow of materials in the conveying bin, then the material conveying amount of the scraper can be increased or decreased, and the conveying efficiency is improved by adjusting the length of the scraper in real time. The working state of the scraper can be adjusted in time according to material flow changes, effective conveying of materials is ensured, excessive or insufficient conveying is avoided, and meanwhile the situation that the bottom is clamped can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of scraper conveyors, in particular to a scraper conveyor and a control method thereof. Background Art

[0002] Scraper conveyor is a kind of equipment commonly used for material transportation. It is widely used in mining, coal, metallurgy, chemical industry and building materials industries. Scraper conveyor uses scraper chain as traction part. Through the circular motion of the chain, it drives the scraper to transport bulk materials in the trough. The rotary end of the scraper chain and the head together form the closed motion of the scraper chain, thereby realizing the continuous conveying of materials.

[0003] When unloading materials, since the overall continuous unloading amount is in a relatively random state, the intermittent conveying amount is also relatively random. The existing scraper conveyor is not convenient to stably adjust the length of the scraper according to the change of the unloading amount, which is easy to affect the conveying stability. When there are more materials, overflow occurs, affecting the subsequent continuous conveying. Since there is a gap between the scraper of the conveyor and the bottom of the inner wall of the conveying bin, if smaller particles are stuck in the gap, it is not convenient for the conveyor to process the particles in the gap, causing the scraper to get stuck or pause during transportation. Not only will the chain need to bear greater pulling force to drive the chain to continue moving, it will also increase the wear on the chain and cause the risk of chain breakage, and it will also cause wear on the scraper and the inner wall of the conveying bin. In response to the above problems, it is urgently necessary to carry out innovative design on the original basis. Summary of the invention

[0004] The object of the present invention is to provide a scraper conveyor and a control method thereof, so as to solve the problem proposed in the above-mentioned background technology that when unloading, the overall continuous unloading amount is in a relatively random state, which leads to the intermittent conveying amount being relatively random. The existing scraper conveyor is not convenient for stably adjusting the length of the scraper according to the change of the unloading amount. Since a gap will be generated between the scraper of the conveyor and the bottom of the inner wall of the conveying bin, if smaller particles are stuck in the gap, it is not convenient for the conveyor to process the particles in the gap, causing the scraper to get stuck or pause during transportation. The technical solution of the present invention is aimed at the technical problem that the existing technical solution is too single, and provides a solution that is significantly different from the existing technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: In a first aspect, the present invention provides a scraper conveyor, comprising a mounting frame, a conveying bin is mounted on the top of the mounting frame, a feed pipe is mounted above one end of the conveying bin, a discharge port is mounted below the other end of the conveying bin, a transmission shaft sleeve inside the conveying bin is connected with a chain, a scraper is mounted on the side end of the chain, a flow monitor is mounted inside the feed pipe, an electric push rod is mounted on the side end of the conveying bin, an electromagnet is mounted on the inner wall of the other side of the conveying bin, and an extension plate is slidably connected inside the scraper; An extension locking mechanism, which is arranged inside the scraper and is used to increase the length of the scraper to carry more materials when the material transport volume is large; The bottom angle expansion mechanism is arranged at the bottom of the scraper, and the bottom angle expansion mechanism is used to enable the bottom of the scraper to fit with the bottom of the inner wall of the conveying bin when the extension plate is extended, thereby preventing material from remaining at the bottom of the inner wall of the conveying bin.

[0006] Preferably, the extension locking mechanism includes a support block sliding in the internal cavity of the scraper, a connecting rod is installed between the support block and the extension plate, a top block slides in the slide groove on one side of the scraper, an extrusion block A slides in the internal cavity of the scraper, a connecting rod is installed between the extrusion block A and the top block, a support rod slides in the groove of the internal cavity of the scraper, a locking block is connected to the top of the support rod through a spring, an extrusion block A slides in the transverse groove at the bottom of the support rod, a top plate slides in the groove on the other side of the scraper, a connecting rod is installed between the top plate and the extrusion block A, and a pressure plate is installed at the protruding end of the electric push rod.

[0007] Preferably, the surfaces of the connecting rods are sleeved with springs, and the surface of the top plate is installed with a metal plate.

[0008] Preferably, the tops of the extrusion block A and the locking block are both provided with sawtooth-shaped notches, and one side of the notch is vertical and the other side is inclined.

[0009] Preferably, the surfaces of the extrusion block A and the extrusion block B are both provided with smooth inclined surfaces.

[0010] Preferably, the bottom angle expansion mechanism includes a rotating plate arranged in the bottom groove of the scraper, an airbag is installed at the bottom of the rotating plate, a scraper block is installed at the bottom of the airbag, and also includes an air cavity opened inside the scraper, a piston rod A slides inside the air cavity, the top of the piston rod A is connected to the bottom of the support block, an oil cavity is opened on the side wall of the bottom groove of the scraper, a piston rod B is slidably connected inside the oil cavity, an oil pipe is installed at the top of the bottom groove of the scraper, a piston rod C is slidably connected inside the oil pipe, a hose is connected between the oil cavity and the oil pipe, and a hose is connected between the air cavity and the airbag.

[0011] Preferably, a protrusion is installed at the bottom of the piston rod C, the protrusion is rotatably connected to the rotating plate, and a torsion spring is installed inside the rotating plate.

[0012] Preferably, the scraper block is designed in a trapezoidal block shape and is made of hard rubber.

[0013] In a second aspect, a control method for a scraper conveyor is provided, the control method comprising the following steps: A control box is installed outside the conveying bin, and first control information is generated based on changes in the flow monitor, and the first control information is used to control the extension degree of the electric push rod. At this time, after receiving the first control information, the control box drives the electric push rod to extend to different lengths according to changes in the first control information; Preferably, the control box will send out a second control information to drive the motor to operate, so that the inside of the conveying bin starts working. After sending out the second control information, the control box will generate a third control information to drive the electromagnet to operate, so that the locking block loses its limiting function and the extension plate will automatically reset.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention, through the scraper, flow monitor, electric push rod, electromagnet, extension plate and extension locking mechanism, can adjust the length of the scraper according to the flow of materials inside the conveying bin, and thus can increase or decrease the material transportation capacity of the scraper. By adjusting the length of the scraper in real time, the working state of the scraper can be timely adjusted according to the change of material flow, to ensure the effective transportation of materials and avoid excessive or insufficient transportation. When transporting larger materials, the extension of the scraper can better transport the large-volume materials, and the extended length of the scraper will be automatically locked when the scraper is extended, to avoid the problem that when the conveying bin vibrates or shakes, the extension plate will shake, causing the material on the scraper surface to fall off.

[0015] The present invention, through the bottom angle expansion mechanism, can extend the scraper block at the bottom when the scraper is extended, so that the scraper block fits with the bottom of the inner wall of the conveying bin, and the scraper and the inner wall of the conveying bin are reduced, so that the scraper can carry more materials and prevent the materials from falling through the bottom gap. If smaller particles are stuck between the scraper block and the inner wall of the conveying bin, the design of the bottom angle expansion mechanism can deal with the sticking problem of small particles. This design makes it possible for small particles between the scraper block and the inner wall of the conveying bin to be easily discharged, thereby improving the smoothness of operation and reducing the jamming phenomenon in the material conveying process. This can not only avoid frequent pauses and jams of the scraper, but also reduce the wear on the chain and the scraper. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic flow chart of the method of the present invention; Figure 2 It is a schematic diagram of the structure of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 4 This is a schematic diagram of the chain and scraper structure of the present invention; Figure 5 for Figure 4 The enlarged structural diagram at A in the middle; Figure 6 for Figure 4 The enlarged structural diagram at B in the middle; Figure 7 It is a schematic diagram of the scraper structure; Figure 8 It is a schematic diagram of the cross-sectional structure of the scraper; Fig. 9 for Figure 8 The enlarged structural diagram at C in the middle; Fig.10 It is a schematic diagram of the exploded structure of the branch extension locking mechanism; Fig.11 for Fig.10 The enlarged structural diagram at D in the middle; Fig.12 It is a schematic diagram of the explosion structure of the bottom angle expansion mechanism; Fig.13 for Fig.12 The enlarged structural diagram at E in the middle; Fig.14 It is a schematic diagram of the cross-sectional structure of the oil chamber.

[0017] In the figure: 1. mounting frame; 2. conveying bin; 3. feeding pipe; 4. discharging port; 5. chain; 6. scraper; 7. flow monitor; 8. electric push rod; 9. electromagnet; 10. extension plate; 11. extension locking mechanism; 111. support block; 112. top block; 113. extrusion block A; 114. locking block; 115. support rod; 116. extrusion block B; 117. top plate; 118. pressing plate; 12. bottom angle expansion mechanism; 121. rotating plate; 122. air bag; 123. scraper block; 124. air cavity; 125. piston rod A; 126. oil cavity; 127. piston rod B; 128. oil pipe; 129. piston rod C. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 2 - Fig.13 A scraper conveyor shown in the figure comprises a mounting frame 1, a conveying bin 2 is mounted on the top of the mounting frame 1, a feed pipe 3 is mounted above one end of the conveying bin 2, a discharge port 4 is mounted below the other end of the conveying bin 2, a chain 5 is connected to the transmission shaft sleeve inside the conveying bin 2, a scraper 6 is mounted on the side end of the chain 5, a flow monitor 7 is mounted inside the feed pipe 3, an electric push rod 8 is mounted on the side end of the conveying bin 2, an electromagnet 9 is mounted on the inner wall of the other side of the conveying bin 2, and an extension plate 10 is slidably connected inside the scraper 6; An extension locking mechanism 11 is arranged inside the scraper 6, and the extension locking mechanism 11 is used to increase the length of the scraper 6 to carry more materials when the material transportation volume is large; The bottom angle expansion mechanism 12 is arranged at the bottom of the scraper 6, and the bottom angle expansion mechanism 12 is used to make the bottom of the scraper 6 fit with the bottom of the inner wall of the conveying bin 2 when the extension plate 10 is extended, so as to prevent the material from remaining at the bottom of the inner wall of the conveying bin 2; During operation, when unloading, since the overall continuous unloading amount is in a relatively random state, the intermittent conveying amount is also relatively random. The existing scraper conveyor is not convenient for stably adjusting the length of the scraper 6 according to the change of the unloading amount, which easily affects the conveying stability. This embodiment of the present invention can solve the above problems. The specific implementation method is as follows. When transporting materials, first, the motor drives the internal transmission shaft of the conveying bin 2 to operate, and the transmission shaft then drives the chain 5 to move, thereby enabling the scraper 6 to transport the material. At this time, the flow monitor 7 can detect the flow of the material inside the feed pipe 3, and then the electric push rod 8 pushes the pressure block to move into the conveying bin 2. The pressure block moves inward. During the movement, the top block 112 will be squeezed to make it slide inward. When the top block 112 slides inward, the extrusion block A113 will squeeze the support block 111, so that the extension plate 10 will move up. The locking block 114 at the bottom of the extrusion block A113 will lock the moving position of the extrusion block, so as to lock the extended length of the extension plate 10. When the scraper 6 passes through the discharge port 4, the electromagnet 9 will adsorb the top plate 117, so as to drive the extrusion block B116 to retract. At this time, the support rod 115 will drive the locking block 114 to move downward, so as to lose the locking function of the extrusion block A113. The top block 112 will then drive the extrusion block A113 to reset, so that the extension plate 10 will automatically retract.

[0020] As an embodiment of the present invention, the extension locking mechanism 11 includes a support block 111 sliding in the internal cavity of the scraper 6, a connecting rod is installed between the support block 111 and the extension plate 10, a top block 112 slides in a slide groove on one side of the scraper 6, an extrusion block A113 slides in the internal cavity of the scraper 6, a connecting rod is installed between the extrusion block A113 and the top block 112, a support rod 115 slides in the groove of the internal cavity of the scraper 6, the top of the support rod 115 is connected to a locking block 114 through a spring, and an extrusion block A113 slides in the horizontal groove at the bottom of the support rod 115. A top plate 117 slides in the groove on the other side of the scraper 6, a connecting rod is installed between the top plate 117 and the extrusion block A113, and a pressure plate 118 is installed on the protruding end of the electric push rod 8. The extension locking mechanism 11 can adjust the length of the scraper 6 according to the flow rate of the material inside the conveying bin 2, thereby increasing or decreasing the amount of material transported by the scraper 6. By adjusting the length of the scraper 6 in real time, the working state of the scraper 6 can be adjusted in time according to the change of the material flow rate, thereby ensuring the effective transportation of the material and avoiding excessive or insufficient transportation.

[0021] As an embodiment of the present invention, a spring is sleeved on the surface of the connecting rod, and a metal plate is installed on the surface of the top plate 117. The design of the spring on the surface of the connecting rod can automatically reset after the connecting rod moves. When the scraper 6 contacts the electromagnet 9, the electromagnet 9 can adsorb the top plate 117 in the groove at the side end of the scraper 6, so that the locking block 114 loses its locking function and drives the extension plate 10 to retract.

[0022] As an embodiment of the present invention, a serrated notch is provided on the top of the extrusion block A113 and the locking block 114, and one side of the notch is vertical and the other side is inclined. The design of the serrated notch with one side vertical and the other side inclined means that when the extrusion block A113 moves, the locking block 114 can only move one side, and the locking block 114 will limit the extrusion block A113.

[0023] As an embodiment of the present invention, the surfaces of the extrusion block A113 and the extrusion block B116 are both provided with smooth inclined surfaces. The extrusion block A113 can extrude the support block 111 through the inclined surface, thereby driving the extension plate 10 to move. The extrusion block B116 can move the locking block 114 downward through the inclined surface, thereby causing it to lose its limiting effect, thereby driving the extension plate 10 to shrink.

[0024] As an embodiment of the present invention, the bottom angle expansion mechanism 12 includes a rotating plate 121 arranged in the bottom groove of the scraper 6, an air bag 122 is installed at the bottom of the rotating plate 121, a scraper block 123 is installed at the bottom of the air bag 122, and also includes an air cavity 124 opened inside the scraper 6, a piston rod A125 slides inside the air cavity 124, the top of the piston rod A125 is connected to the bottom of the support block 111, an oil cavity 126 is opened on the side wall of the groove at the bottom of the scraper 6, a piston rod B127 is slidably connected inside the oil cavity 126, an oil pipe 128 is installed at the top of the groove at the bottom of the scraper 6, and the oil pipe 128 is inside the oil pipe 128. The piston rod C129 is slidably connected to the bottom, a hose is connected between the oil chamber 126 and the oil pipe 128, and a hose is connected between the air chamber 124 and the air bag 122. When the scraper 6 is extended, the scraper block 123 at the bottom can be extended, so that the scraper block 123 fits with the bottom of the inner wall of the conveying bin 2, so that the scraper 6 and the inner wall of the conveying bin 2 are reduced, so that the scraper 6 can carry more materials and prevent the materials from falling through the bottom gap. If smaller particles are stuck between the scraper block 123 and the inner wall of the conveying bin 2, the design of the bottom angle expansion mechanism 12 can also deal with the problem of small particles getting stuck.

[0025] As an embodiment of the present invention, a protrusion is installed at the bottom of the piston rod C129, and the protrusion is rotatably connected to the rotating plate 121. A torsion spring is installed inside the rotating plate 121. The establishment of the torsion spring can make the rotating plate 121 automatically reset after losing resistance.

[0026] As an embodiment of the present invention, the scraper block 123 is designed in a trapezoidal block shape, and the scraper block 123 is made of hard rubber. When the rotating plate 121 rotates, the sharp end of the scraper block 123 will contact the inner wall of the conveying bin 2. The design of the scraper block 123 made of hard rubber can prevent the scraper block 123 from wearing the inner wall of the conveying bin 2.

[0027] like Figure 1 A control method for a conveyor is shown, the control method comprising the following steps: A control box is installed outside the conveying bin 2. First control information is generated based on the change of the flow monitor 7. The first control information is used to control the extension degree of the electric push rod 8. At this time, after receiving the first control information, the control box drives the electric push rod 8 to extend to different lengths according to the change of the first control information. The control box will send out a second control message to drive the motor to operate, so that the inside of the conveying bin 2 starts working. After sending out the second control message, the control box will generate a third control message to drive the electromagnet 9 to operate, so that the locking block 114 loses its limiting function, and the extension plate 10 will automatically reset.

[0028] Working principle: When transporting materials, the motor first drives the transmission shaft inside the conveying bin 2 to operate, and the transmission shaft then drives the chain 5 to move, so that the scraper 6 transports the materials. At this time, the flow monitor 7 can detect the flow of the material inside the feed pipe 3, and then the electric push rod 8 pushes the pressing block to move inside the conveying bin 2. When the pressing block moves inward, it squeezes the top block 112 to make it slide inward. When the top block 112 slides inward, the squeezing block A113 squeezes the supporting block 111, thereby The extension plate 10 is moved upward, and the locking block 114 at the bottom of the extrusion block A113 will lock the position of the extrusion block, thereby being able to lock the extension length of the extension plate 10. When the scraper 6 passes through the discharge port 4, the electromagnet 9 will adsorb the top plate 117, thereby driving the extrusion block B116 to shrink. At this time, the support rod 115 will drive the locking block 114 to move downward, thereby losing the locking function of the extrusion block A113, and the top block 112 will then drive the extrusion block A113 to reset, so that the extension plate 10 automatically shrinks; When the extension plate 10 moves upward, it will drive the piston rod A125 to move upward. At this time, the piston rod A125 will fill the gas inside the air cavity 124 into the air bag 122 when moving upward. At this time, the scraper block 123 will extend downward to reduce the gap between the scraper block 123 and the inner wall of the conveying bin 2. If the bottom of the scraper block 123 is blocked by particles and the scraper block 123 encounters resistance, the rotating plate 121 will rotate and squeeze the piston rod B127 through the scraper block 123, so that the oil inside the oil cavity 126 is injected into the oil pipe 128, and the oil pipe 128 will drive the piston rod to move upward, thereby facilitating the smooth passage of stuck materials.

[0029] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field. In the description of the present invention, unless otherwise specified, "multiple" means two or more; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A scraper conveyor, comprising a mounting frame (1), characterized in that: A conveying bin (2) is installed at the top of the mounting frame (1), a feed pipe (3) is installed above one end of the conveying bin (2), a discharge port (4) is installed below the other end of the conveying bin (2), a transmission shaft sleeve inside the conveying bin (2) is connected to a chain (5), a scraper (6) is installed at the side end of the chain (5), a flow monitor (7) is installed inside the feed pipe (3), an electric push rod (8) is installed at the side end of the conveying bin (2), an electromagnet (9) is installed on the inner wall of the other side of the conveying bin (2), and an extension plate (10) is slidably connected inside the scraper (6); An extension locking mechanism (11), wherein the extension locking mechanism (11) is arranged inside the scraper (6), and the extension locking mechanism (11) is used to increase the length of the scraper (6) when the material transport volume is large so as to carry more material; A bottom angle expansion mechanism (12), wherein the bottom angle expansion mechanism (12) is arranged at the bottom of the scraper (6), and the bottom angle expansion mechanism (12) is used to enable the bottom of the scraper (6) to fit with the bottom of the inner wall of the conveying bin (2) when the extension plate (10) is extended, thereby preventing material from remaining at the bottom of the inner wall of the conveying bin (2).

2. A scraper conveyor according to claim 1, characterized in that: The extension locking mechanism (11) comprises a support block (111) which slides in the internal cavity of the scraper (6), a connecting rod is installed between the support block (111) and the extension plate (10), a top block (112) slides in a slide groove on one side of the scraper (6), an extrusion block A (113) slides in the internal cavity of the scraper (6), a connecting rod is installed between the extrusion block A (113) and the top block (112), a support rod (115) slides in the groove of the internal cavity of the scraper (6), a locking block (114) is connected to the top of the support rod (115) via a spring, an extrusion block A (113) slides in the transverse groove at the bottom of the support rod (115), a top plate (117) slides in the groove on the other side of the scraper (6), a connecting rod is installed between the top plate (117) and the extrusion block A (113), and a pressing plate (118) is installed at the protruding end of the electric push rod (8).

3. A scraper conveyor according to claim 2, characterized in that: The surfaces of the connecting rods are sleeved with springs, and the surface of the top plate (117) is mounted with a metal plate.

4. A scraper conveyor according to claim 3, characterized in that: The extrusion block A (113) and the locking block (114) are both provided with a sawtooth-shaped notch at the top, and one side of the notch is vertical and the other side is inclined.

5. A scraper conveyor according to claim 4, characterized in that: The surfaces of the extrusion block A (113) and the extrusion block B (116) are both provided with smooth inclined surfaces.

6. A scraper conveyor according to claim 1, characterized in that: The bottom angle expansion mechanism (12) comprises a rotating plate (121) arranged in the bottom groove of the scraper (6), an air bag (122) being installed at the bottom of the rotating plate (121), a scraper block (123) being installed at the bottom of the air bag (122), and an air cavity (124) opened inside the scraper (6), a piston rod A (125) slidingly arranged inside the air cavity (124), the top end of the piston rod A (125) being connected to the bottom of the support block (111), an oil cavity (126) being opened on the side wall of the bottom groove of the scraper (6), a piston rod B (127) being slidably connected inside the oil cavity (126), an oil pipe (128) being installed at the top end of the bottom groove of the scraper (6), a piston rod C (129) being slidably connected inside the oil pipe (128), a hose being connected between the oil cavity (126) and the oil pipe (128), and a hose being connected between the air cavity (124) and the air bag (122).

7. A scraper conveyor according to claim 6, characterized in that: A protrusion is installed at the bottom of the piston rod C (129), and the protrusion is rotatably connected to the rotating plate (121). A torsion spring is installed inside the rotating plate (121).

8. A scraper conveyor according to claim 6, characterized in that: The scraper block (123) is designed in a trapezoidal block shape and is made of hard rubber.

9. A control method for a scraper conveyor, applicable to a scraper conveyor according to any one of claims 1 to 8, characterized in that: The control method The steps include: A control box is installed outside the conveying bin (2), and first control information is generated based on changes in the flow monitor (7). The first control information is used to control the extension degree of the electric push rod (8). At this time, after receiving the first control information, the control box drives the electric push rod (8) to extend to different lengths according to changes in the first control information.

10. A control method for a scraper conveyor according to claim 9, characterized in that: The control box will send out a second control message to drive the motor to operate, so that the inside of the conveying bin (2) starts to work. After sending out the second control message, the control box will generate a third control message to drive the electromagnet (9) to operate, so that the locking block (114) loses its limiting function and the extension plate (10) will automatically reset.

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