Open pit side slope mining portal protection and dust removal device

Abstract

The present application belongs to the technical field of coal mining. In order to solve the problem of loose protection structure of existing side slope equipment, separate arrangement of dust removal system, low safety and dust removal efficiency, an open side slope mining portal protection and dust removal device is provided. The device is arranged on a platform and includes a protection assembly arranged at one end of the platform close to the mining portal, an extension assembly, a negative pressure air duct, a suction air duct and a dust remover connected in sequence. The extension assembly includes a first connecting piece, an extension arm, a plurality of bent plates and a plurality of support frames. The extension arm includes a plurality of sleeves that are mutually sleeved. The negative pressure air duct is arranged in the support frame. A driving assembly is arranged in the sleeve. The driving assembly drives the plurality of sleeves and the negative pressure air duct to move towards or away from the mining portal, so that the negative pressure air duct exceeds the protection assembly or is completely retracted to the bottom of the protection assembly. The device has a compact structure, can protect the dust removal equipment, can adaptively adjust the dust removal, and can meet various working conditions and mining processes of side slope mining.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mining, and in particular relates to a device for protecting and removing dust from an open-pit sidewall mining tunnel entrance. Background Art

[0002] In recent years, with the improvement of open-pit sidewall mining equipment, my country's open-pit coal mines have developed rapidly. The coal production of open-pit coal mines has exceeded 300 million tons, and the proportion of annual total production has increased from 5% to nearly 10%. Open-pit sidewall mining and transportation systems and coal mining machines have also gradually gained recognition and promotion in the industry. The sidewalls and endwalls of open-pit coal mines are subject to mining restrictions such as boundary and slope stability. As a result, some coal reserves have to be abandoned or stripped to a large extent, and high-quality coal is slowly exposed. This leads to increased mining costs and poor economic benefits. At the same time, during the sidewall mining process, the mining tunnels formed by coal mining can cause roof instability, and debris may fall above the tunnel entrance, or even local collapse, which can easily damage mining equipment. If the corresponding tunnel entrance protection measures are not in place, the safety of sidewall mining operations will be greatly reduced.

[0003] The front-end protection structure of existing side equipment is loose and mostly fixed. The dust removal system is arranged separately, without considering the space utilization and compact structure of the stepping platform. The safety and dust removal efficiency are low. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides an open-pit sidewall mining entrance protection and dust removal device with a compact structure and improved safety and dust removal effect.

[0005] The present invention provides an open-pit sidewall mining entrance protection and dust removal device, which is arranged on a platform and includes a protection component, a telescopic component, an air suction duct, a negative pressure duct and a dust collector. The protection component is arranged at one end of the platform close to the mining tunnel, the air suction duct is connected to the bottom of the protection component by bolts, one end of the air suction duct is connected to the dust collector, and the other end is connected to the negative pressure duct, the telescopic component includes a first connecting member, a telescopic arm, a plurality of bent plates and a plurality of support frames, one end of the first connecting member is connected to the telescopic arm The top of the arm is connected, and the other end is connected to the protective assembly. The telescopic arm includes a plurality of sleeves that are socketed with each other, a plurality of the bent plates are correspondingly connected to the plurality of the sleeves, and a plurality of the support frames are correspondingly connected to the plurality of the bent plates. The negative pressure air duct is arranged in the support frame, and a driving assembly is arranged in the sleeve. The driving assembly drives the plurality of the sleeves to move toward or away from the mining tunnel, so as to drive the negative pressure air duct to move toward or away from the mining tunnel, so that the negative pressure air duct exceeds the protective assembly or is completely retracted to the bottom of the protective assembly.

[0006] Optionally, the protective assembly includes a first-level protective plate, a second-level protective plate and a third-level protective plate. A connecting plate is provided at one end of the first-level protective plate close to the platform. One end of the first-level protective plate is connected to the platform through the connecting plate, and the other end of the first-level protective plate is connected to the second-level protective plate. The end of the second-level protective plate away from the first-level protective plate is rotatably connected to the third-level protective plate.

[0007] Optionally, the bottom of the secondary protective plate is hingedly connected to an extension cylinder, and the secondary protective plate and the tertiary protective plate are connected by a connecting rod assembly, and the connecting rod assembly includes a long connecting rod and a short connecting rod that are hingedly connected, and the cylinder rod of the extension cylinder is connected to the hinge of the long connecting rod and the short connecting rod.

[0008] Optionally, a reinforcement is provided between the connecting plate and the primary protective plate, and the reinforcement is arranged at an angle.

[0009] Optionally, the height of the first connecting member is greater than the sum of the thickness of the secondary protective plate and the thickness of the tertiary protective plate, and the sum of the length of the telescopic arm when fully retracted and the length of the tertiary protective plate is less than the sum of the length of the primary protective plate and the length of the secondary protective plate.

[0010] Optionally, the multiple sleeves include a fixed sleeve, a first-level sleeve, a second-level sleeve, a third-level sleeve and a fourth-level sleeve which are sleeved in sequence, and the driving assembly includes a pulley group, a wire rope and an active oil cylinder, and the pulley group includes a first pulley, a second pulley, a third pulley, a fourth pulley and a fifth pulley, and the first pulley, the second pulley, the third pulley, the fourth pulley and the fifth pulley are respectively arranged on one end of the fixed sleeve, the first-level sleeve, the second-level sleeve, the third-level sleeve and the fourth-level sleeve along the extension direction, one end of the active oil cylinder is connected to the inner wall of the fixed sleeve, and the other end is connected to the first-level sleeve by passing the wire rope around the cylinder rod of the active oil cylinder, the fixed sleeve is connected to the second-level sleeve by passing the wire rope around the second pulley, the first-level sleeve is connected to the third-level sleeve by passing the wire rope around the third pulley, and the second-level sleeve is connected to the fourth-level sleeve by passing the wire rope around the fourth pulley.

[0011] Optionally, the support frame is rectangular, and circular rings are provided at the centers of the four sides of the support frame. Hooks are provided at positions corresponding to the circular rings on the circumference of the negative pressure air duct, and the hooks are suitable for hanging on the circular rings.

[0012] Optionally, the open end of the hook is hingedly connected to a limit plate.

[0013] Optionally, a second connecting member is further included, and the suction duct is connected to the negative pressure duct via the second connecting member, and a sealing member is provided between the second connecting member and the suction duct and the negative pressure duct.

[0014] The technical solution provided by the embodiment of the present invention has the following beneficial effects compared with the prior art:

[0015] An embodiment of the present invention provides a device for protecting and removing dust from an open-pit sidewall mining tunnel entrance. This device arranges a protective assembly at one end of a platform close to the mining tunnel, and arranges a telescopic assembly, an air suction duct, a negative pressure duct and a dust collector at the bottom of the protective assembly, so that the protective assembly can protect the telescopic assembly, the air suction duct, the negative pressure duct and the dust collector, and prevent the dust removal equipment from being damaged by falling rocks or local collapse. By arranging a telescopic assembly connected to the protective assembly, the telescopic assembly includes a telescopic arm, and the telescopic arm includes a plurality of sleeves that are socketed with each other, each sleeve is provided with a bent plate, and each bent plate is connected to a support frame, the negative pressure duct is arranged in the plurality of support frames, and a drive assembly is arranged in the sleeve, and the drive assembly The dynamic component can drive the sleeve to perform telescopic movement, thereby driving multiple support frames to perform reciprocating movement along the travel direction of the tunneling equipment, thereby driving the negative pressure air duct to move toward or away from the mining tunnel. When the negative pressure air duct moves toward the mining tunnel and moves into the mining tunnel, it can perform dust removal operations on the tunnel entrance. When the negative pressure air duct moves away from the mining tunnel and is completely retracted to the bottom of the protective component, the protective component can protect the dust prevention equipment. This device integrates the protective component and the telescopic component with dust prevention function, the suction air duct, the negative pressure air duct and the dust collector into an integrated layout, which improves the compactness of the structure of this device. By adopting the telescopic component, adaptive dust removal is achieved, which can meet various working conditions and mining processes of side mining. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 This is a schematic structural diagram of an open-pit sidewall mining entrance protection and dust removal device according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic structural diagram of a protective assembly according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the three-stage protective plate after folding according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic structural diagram of a telescopic assembly according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic structural diagram of the telescopic arm according to an embodiment of the present invention;

[0023] Figure 6 This is a structural diagram of the connection between the support frame and the negative pressure air duct according to an embodiment of the present invention;

[0024] Figure 7 This is a schematic structural diagram of the telescopic arm according to an embodiment of the present invention when it is retracted;

[0025] Figure 8 This is a schematic structural diagram of the telescopic arm when it is unfolded according to an embodiment of the present invention.

[0026] Among them, 1. Protection assembly; 1.1. First-level protection plate; 1.2. Second-level protection plate; 1.3. Third-level protection plate; 1.4. Connecting plate; 1.5. Extension cylinder; 1.6. Long connecting rod; 1.7. Short connecting rod; 1.8. Reinforcement; 2. Telescopic assembly; 2.1. First connecting member; 2.2. Telescopic arm; 2.2.1. Fixed sleeve; 2.2.2. First-level sleeve; 2.2.3. Second-level sleeve; 2.2.4. Third-level sleeve ; 2.2.5, fourth-stage sleeve; 2.3, bent plate; 2.4, support frame; 2.4.1, ring; 2.5, pulley block; 2.5.1, first pulley; 2.5.2, second pulley; 2.5.3, third pulley; 2.5.4, fourth pulley; 2.5.5, fifth pulley; 2.6, wire rope; 2.7, active cylinder; 3, suction duct; 4, platform; 5, negative pressure duct; 6, second connecting piece; 7, dust collector. DETAILED DESCRIPTION

[0027] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] Reference Figures 1 to 6As shown, this embodiment provides an open-pit sidewall mining entrance protection and dust removal device, which is arranged on a platform 4 and includes a protection component 1, a telescopic component 2, an air suction duct 3, a negative pressure duct 5 and a dust collector 7. The protection component 1 is arranged at one end of the platform 4 close to the mining tunnel. The air suction duct 3 is connected to the bottom of the protection component 1 by bolts. One end of the air suction duct 3 is connected to the dust collector 7, and the other end is connected to the negative pressure duct 5. The telescopic component 2 includes a first connecting member 2.1, a telescopic arm 2.2, a plurality of bent plates 2.3 and a plurality of support frames 2.4. The first connecting member One end of 2.1 is connected to the top of the telescopic arm 2.2, and the other end is connected to the protective assembly 1. The telescopic arm 2.2 includes multiple sleeves that are socketed with each other, multiple bent plates 2.3 are correspondingly connected to the multiple sleeves, and multiple support frames 2.4 are correspondingly connected to the multiple bent plates 2.3. The negative pressure air duct 5 is arranged in the support frame 2.4, and a driving assembly is arranged in the sleeve. The driving assembly drives the multiple sleeves to move toward or away from the mining tunnel, so as to drive the negative pressure air duct 5 to move toward or away from the mining tunnel, so that the negative pressure air duct 5 exceeds the protective assembly 1 or is completely retracted to the bottom of the protective assembly 1.

[0030] Among them, this device is through arranging the protection component 1 at one end of the platform 4 close to the mining tunnel, and arranging the telescopic component 2, the suction air duct 3, the negative pressure air duct 5 and the dust collector 7 at the bottom of the protection component 1, so that the protection component 1 can protect the telescopic component 2, the suction air duct 3, the negative pressure air duct 5 and the dust collector 7, and prevent the dust removal equipment from being damaged by falling rocks or local collapse. By arranging the telescopic component 2 connected to the protection component 1, the telescopic component 2 includes a telescopic arm 2.2, and the telescopic arm 2.2 includes a plurality of sleeves that are socketed with each other, each sleeve is provided with a bent plate 2.3, and each bent plate 2.3 is connected to a support frame 2.4, the negative pressure air duct 5 is arranged in the plurality of support frames 2.4, and a driving component is provided in the sleeve, driving The component can drive the sleeve to perform telescopic movement, thereby driving multiple support frames 2.4 to perform reciprocating movement along the travel direction of the excavation equipment, thereby driving the negative pressure air duct 5 to move toward or away from the mining tunnel. When the negative pressure air duct 5 moves toward the mining tunnel and moves into the mining tunnel, it can perform dust removal operations on the tunnel entrance. When the negative pressure air duct 5 moves away from the mining tunnel to the bottom of the protective component 1 that is completely retracted, the protective component 1 can protect the dust prevention equipment. This device integrates the protective component 1 and the telescopic component 2 with dust prevention function, the suction air duct 3, the negative pressure air duct 5 and the dust collector 7 into an integrated layout, thereby improving the compactness of the structure of this device. By adopting the telescopic component 2, adaptive dust removal is achieved, which can meet various working conditions and mining processes of side mining.

[0031] Further, refer to Figure 2 and Figure 3As shown, the protective assembly 1 includes a first-level protective plate 1.1, a second-level protective plate 1.2, and a third-level protective plate 1.3. The first-level protective plate 1.1 is provided with a connecting plate 1.4 at one end close to the platform 4. One end of the first-level protective plate 1.1 is connected to the platform 4 via the connecting plate 1.4. The other end of the first-level protective plate 1.1 is connected to the second-level protective plate 1.2. The end of the second-level protective plate 1.2 away from the first-level protective plate 1.1 is rotatably connected to the third-level protective plate 1.3. Specifically, the protective assembly 1 includes three protective plates connected in sequence. The first-level protective plate 1.1 is vertically provided with a connecting piece 1.4 at one end. The connecting piece 1.4 is used to connect to the platform 4, thereby realizing the connection between the first-level protective plate 1.1 and the platform 4. The other end of the first-level protective plate 1.1 is connected to the second-level protective plate 1.2 by bolts. The end of the second-level protective plate 1.2 away from the first-level protective plate 1.1 is rotatably connected to the third-level protective plate 1.3. In other words, the third-level protective plate 1.3 can rotate along the center line of the connection with the second-level protective plate 1.2. The three-stage protective plate 1.3 can be rotated 180 degrees to reach the state of expansion or retraction. When the dust removal operation is performed, the telescopic component 2 is extended. Before this, the three-stage protective plate 1.3 is first expanded so that the three-stage protective plate 1.3 is rotated to be parallel to the secondary protective plate 1.2, so that the primary protective plate 1.1, the secondary protective plate 1.2 and the three-stage protective plate 1.3 form an integral protective mechanism to protect the telescopic component 2, the suction duct 3, the negative pressure duct 5 and the dust collector 7 during the dust removal operation. When the dust removal operation is completed, refer to Figure 3 As shown, the telescopic assembly 2 drives the negative pressure air duct 5 to retract. After the retraction is completed, the third-level protective plate 1.3 rotates 180 degrees to the bottom of the second-level protective plate 1.2 to shorten the length of the entire device and reduce the impact during movement.

[0032] Continue to refer to Figure 2 and Figure 3 As shown, the bottom of the secondary protective plate 1.2 is hingedly connected to the extension cylinder 1.5, and the secondary protective plate 1.2 and the tertiary protective plate 1.3 are connected by a connecting rod assembly. The connecting rod assembly includes a long connecting rod 1.6 and a short connecting rod 1.7 that are hingedly connected. The cylinder rod of the extension cylinder 1.5 is connected to the hinge of the long connecting rod 1.6 and the short connecting rod 1.7. Specifically, the long connecting rod 1.6 is hingedly connected to the secondary protective plate 1.2, the short connecting rod 1.7 is hingedly connected to the tertiary protective plate 1.3, and the other end of the long connecting rod 1.6 is hingedly connected to the other end of the short connecting rod 1.7, thereby realizing the connection between the secondary protective plate 1.2 and the tertiary protective plate 1.3. The cylinder barrel of the extension cylinder 1.5 is hingedly set at the bottom of the secondary protective plate 1.2, and the cylinder rod of the extension cylinder 1.5 is connected to the hinge of the long connecting rod 1.6 and the short connecting rod 1.7. By starting the extension cylinder 1.5, the cylinder rod of the extension cylinder 1.5 performs telescopic movement, thereby driving the long connecting rod 1.6 and the short connecting rod 1.7 to rotate, thereby driving the tertiary protective plate 1.3 to rotate.

[0033] In order to ensure the stability of the connection between the first-level protective plate 1.1 and the platform 4, a reinforcement 1.8 is provided between the connecting plate 1.4 and the first-level protective plate 1.1. The reinforcement 1.8 is arranged at an angle. One end of the reinforcement 1.8 is connected to the connecting plate 1.4, and the other end is connected to the top surface of the first-level protective plate 1.1, which improves the strength of the connecting plate 1.4, thereby improving the stability of the connection between the connecting plate 1.4, the first-level protective plate 1.1 and the platform 4.

[0034] Reference Figure 3 As shown, the height of the first connecting member 2.1 is greater than the sum of the thickness of the secondary protective plate 1.2 and the thickness of the tertiary protective plate 1.3, and the sum of the length of the telescopic arm 2.2 when fully retracted and the length of the tertiary protective plate 1.3 is less than the sum of the length of the primary protective plate 1.1 and the length of the secondary protective plate 1.2. That is to say, when the tertiary protective plate 1.3 rotates 180° to the bottom of the secondary protective plate 1.2, it does not affect the telescopic movement of the telescopic arm 2.2.

[0035] Reference Figure 4 、 Figure 5 、 Figure 7 and Figure 8 As shown, the multiple sleeves include a fixed sleeve 2.2.1, a first-level sleeve 2.2.2, a second-level sleeve 2.2.3, a third-level sleeve 2.2.4 and a fourth-level sleeve 2.2.5, which are arranged in sequence. The drive assembly includes a pulley group 2.5, a wire rope 2.6 and an active oil cylinder 2.7. The pulley group 2.5 includes a first pulley 2.5.1, a second pulley 2.5.2, a third pulley 2.5.3, a fourth pulley 2.5.4 and a fifth pulley 2.5.5. The first pulley 2.5.1, the second pulley 2.5.2, the third pulley 2.5.3, the fourth pulley 2.5.4 and the fifth pulley 2.5.5 are respectively arranged on the fixed sleeve 2.2.1, the first sleeve 2.2.2 and the third pulley 2.5.3. Along one end of the extension direction of the secondary sleeve 2.2.3, the tertiary sleeve 2.2.4 and the quaternary sleeve 2.2.5, one end of the active cylinder 2.7 is connected to the inner wall of the fixed sleeve 2.2.1, and the other end is connected to the primary sleeve 2.2.2 by passing through the cylinder rod of the active cylinder 2.7 via the wire rope 2.6. The fixed sleeve 2.2.1 is connected to the secondary sleeve 2.2.3 by passing through the second pulley 2.5.2 via the wire rope 2.6. The primary sleeve 2.2.2 is connected to the tertiary sleeve 2.2.4 by passing through the wire rope 2.6. The secondary sleeve 2.2.3 is connected to the quaternary sleeve 2.2.5 by passing through the fourth pulley 2.5.4 via the wire rope 2.6. Specifically, the telescopic arm 2.2 is a four-stage telescopic mechanism, which comprises a movable pulley mechanism through a pulley block 2.5 and a steel wire rope 2.6, forming a rope arrangement structure, so that the four sleeves can be telescoped synchronously.

[0036] Reference Figure 4 and Figure 6As shown, the support frame 2.4 is rectangular, and circular rings 2.4.1 are provided at the centers of the four sides of the support frame 2.4. A hook is provided at a position corresponding to the circular rings 2.4.1 on the circumference of the negative pressure air duct 5. The hook is suitable for hanging on the circular rings 2.4.1, and the open end of the hook is hingedly connected to a limit plate. Specifically, the negative pressure air duct 5 is connected to the circular rings 2.4.1 provided on the support frame 2.4 through the hooks provided on its circumference, and the circular rings 2.4.1 are provided at the centers of the four sides of the support frame 2.4 to ensure the stability of the negative pressure air duct 5 and prevent it from deflecting. A limit plate is hingedly provided at the open end of the hook so that when the hook is hung on the circular rings 2.4.1, the limit plate can close the opening of the hook to prevent the hook from detaching from the circular rings 2.4.1.

[0037] Reference Figure 1 As shown, the second connecting member 6 is further included, and the suction duct 3 is connected to the negative pressure duct 5 via the second connecting member 6, and a seal is provided between the second connecting member 6 and the suction duct 3 and the negative pressure duct 5. Specifically, the second connecting member 6 is used to connect the suction duct 3 and the negative pressure duct 5, which can effectively absorb the vibration generated during the operation of the device and reduce noise. At the same time, a seal is provided at the connection position of the second connecting member 6, the suction duct 3 and the negative pressure duct 5 to prevent gas leakage, ensure stable airflow during dust removal work, and prevent gases containing harmful substances from flowing into the atmosphere.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0039] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments described herein, but is to be construed in the widest possible manner consistent with the principles and novel features disclosed herein.

Claims

1. A device for protecting and removing dust from an open-pit sidewall mining tunnel entrance, arranged on a platform (4), characterized in that: The invention comprises a protective component (1), a telescopic component (2), an air suction duct (3), a negative pressure duct (5) and a dust collector (7), wherein the protective component (1) is arranged at one end of the platform (4) close to the mining tunnel, the air suction duct (3) is connected to the bottom of the protective component (1) by bolts, one end of the air suction duct (3) is connected to the dust collector (7), and the other end is connected to the negative pressure duct (5), the telescopic component (2) comprises a first connecting member (2.1), a telescopic arm (2.2), a plurality of bent plates (2.3) and a plurality of support frames (2.4), one end of the first connecting member (2.1) is connected to the top of the telescopic arm (2.2), and the other end is connected to the negative pressure duct (5). The telescopic arm (2.2) is connected to the protective assembly (1) at one end, and the other end is connected to the protective assembly (1). The telescopic arm (2.2) includes a plurality of sleeves that are sleeved with each other. The plurality of bent plates (2.3) are correspondingly connected to the plurality of sleeves. The plurality of support frames (2.4) are correspondingly connected to the plurality of bent plates (2.3). The negative pressure air cylinder (5) is arranged in the support frame (2.4). A driving assembly is arranged in the sleeve. The driving assembly drives the plurality of sleeves to move toward or away from the mining tunnel, thereby driving the negative pressure air cylinder (5) to move toward or away from the mining tunnel, so that the negative pressure air cylinder (5) exceeds the protective assembly (1) or is completely retracted to the bottom of the protective assembly (1); The plurality of sleeves include a fixed sleeve (2.2.1), a primary sleeve (2.2.2), a secondary sleeve (2.2.3), a tertiary sleeve (2.2.4) and a quaternary sleeve (2.2.5) which are sleeved in sequence; the drive assembly includes a pulley block (2.5), a wire rope (2.6) and an active oil cylinder (2.7); the pulley block (2.5) includes a first pulley (2.5.1), a second pulley (2.5.2), a third pulley (2.5.3), a fourth pulley (2.5.4) and a fifth pulley (2.5.5); the first pulley (2.5.1), the second pulley (2.5.2), the third pulley (2.5.3), the fourth pulley (2.5.4) and the fifth pulley (2.5.5) are respectively arranged on the fixed sleeve (2.2.1), the primary sleeve (2.2.2), the secondary sleeve (2.2.3), the tertiary sleeve (2.2.4) and the quaternary sleeve (2.2.5); 2.3), the third-stage sleeve (2.2.4) and the fourth-stage sleeve (2.2.5) are connected to one end of the active oil cylinder (2.7) along the extension direction, one end of the active oil cylinder (2.7) is connected to the inner wall of the fixed sleeve (2.2.1), and the other end is connected to the first-stage sleeve (2.2.2) by passing through the cylinder rod of the active oil cylinder (2.7) through the steel wire rope (2.6), the fixed sleeve (2.2.1) is connected to the second-stage sleeve (2.2.3) by passing through the second pulley (2.5.2) through the steel wire rope (2.6), the first-stage sleeve (2.2.2) is connected to the third-stage sleeve (2.2.4) by passing through the third pulley (2.5.3) through the steel wire rope (2.6), and the second-stage sleeve (2.2.3) is connected to the fourth-stage sleeve (2.2.5) by passing through the fourth pulley (2.5.4) through the steel wire rope (2.6).

2. The open-pit sidewall mining entrance protection and dust removal device according to claim 1 is characterized in that: The protection assembly (1) comprises a primary protection plate (1.1), a secondary protection plate (1.2) and a tertiary protection plate (1.3); a connecting plate (1.4) is provided at one end of the primary protection plate (1.1) close to the platform (4); one end of the primary protection plate (1.1) is connected to the platform (4) via the connecting plate (1.4); the other end of the primary protection plate (1.1) is connected to the secondary protection plate (1.2); and the end of the secondary protection plate (1.2) away from the primary protection plate (1.1) is rotatably connected to the tertiary protection plate (1.3).

3. The open-pit sidewall mining entrance protection and dust removal device according to claim 2 is characterized in that: The bottom of the secondary protective plate (1.2) is hingedly connected to an extension cylinder (1.5); the secondary protective plate (1.2) and the tertiary protective plate (1.3) are connected via a connecting rod assembly, the connecting rod assembly comprising a long connecting rod (1.6) and a short connecting rod (1.7) that are hingedly connected; the cylinder rod of the extension cylinder (1.5) is connected to the hinged joint between the long connecting rod (1.6) and the short connecting rod (1.7).

4. The open-pit sidewall mining entrance protection and dust removal device according to claim 2 is characterized in that: A reinforcement member (1.8) is provided between the connecting plate (1.4) and the primary protection plate (1.1), and the reinforcement member (1.8) is arranged at an angle.

5. The open-pit sidewall mining entrance protection and dust removal device according to claim 2 is characterized in that: The height of the first connecting member (2.1) is greater than the sum of the thickness of the secondary protective plate (1.2) and the thickness of the tertiary protective plate (1.3), and the sum of the length of the telescopic arm (2.2) when fully retracted and the length of the tertiary protective plate (1.3) is less than the sum of the length of the primary protective plate (1.1) and the length of the secondary protective plate (1.2).

6. The open-pit sidewall mining entrance protection and dust removal device according to claim 1 is characterized in that: The support frame (2.4) is rectangular, and circular rings (2.4.1) are provided at the centers of the four sides of the support frame (2.4). Hooks are provided at positions corresponding to the circular rings (2.4.1) on the circumference of the negative pressure air duct (5), and the hooks are suitable for hanging on the circular rings (2.4.1).

7. The open-pit sidewall mining entrance protection and dust removal device according to claim 6 is characterized in that: The open end of the hook is hingedly connected to the limit plate.

8. The open-pit sidewall mining entrance protection and dust removal device according to claim 1 is characterized in that: It also includes a second connecting member (6), the suction duct (3) is connected to the negative pressure duct (5) via the second connecting member (6), and sealing members are provided between the second connecting member (6) and the suction duct (3) and the negative pressure duct (5).

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