Open-air slope mining cave mouth protection and dust removal device

Abstract

The invention belongs to the technical field of coal mining. In order to solve the problems that an existing slope equipment protection structure is loose, a dust removal system is independently arranged, and the safety and the dust removal efficiency are low, the open-air slope mining cave mouth protection and dust removal device is provided. Comprising a first connecting piece, a telescopic arm, a plurality of bent plates and a plurality of supporting frames, the telescopic arm comprises a plurality of sleeves which are mutually connected in a sleeved mode, the negative pressure air duct is arranged in the supporting frames, driving assemblies are arranged in the sleeves, and the negative pressure air duct is arranged in the first connecting piece. The driving assembly drives the sleeves and the negative pressure air cylinder to move towards or away from the mining chamber, so that the negative pressure air cylinder exceeds the protection assembly or completely retracts to the bottom of the protection assembly, and the device is compact in structure, can play a role in protecting dustproof equipment, can adjust dust removal in a self-adaptive mode, and meets various working conditions and mining processes of slope mining.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mining, and in particular relates to a protection and dust removal device for an open-pit sidewall mining tunnel opening. 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 output of open-pit coal mines has exceeded 300 million tons, and the annual total output has increased from 5% to nearly 10%. The open-pit sidewall mining and transportation system and coal mining machines have also gradually been recognized and promoted by the industry. Due to mining restrictions such as boundaries and slope stability, the end and sidewalls of open-pit coal mines have to be abandoned or stripped to a large extent, and high-quality coal is slowly exposed, resulting in increased open-pit mining costs and poor economic benefits. At the same time, in the process of sidewall mining, the mining tunnels formed by coal mining will cause the roof to be unstable, and gravel may fall above the tunnel mouth, or even partial collapse, which is easy to cause damage to the mining equipment. If the corresponding tunnel mouth 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 compactness 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 which has a compact structure and improves safety and dust removal effect.

[0005] The present invention provides an open-pit sidewall mining tunnel mouth 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, and the other end is connected to the negative pressure duct. 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 cylinder 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 cylinder to move toward or away from the mining tunnel, so that the negative pressure air cylinder exceeds the protective assembly or is completely retracted to the bottom of the protective assembly.

[0006] Optionally, the protective assembly includes a primary protective plate, a secondary protective plate and a tertiary protective plate, wherein a connecting plate is provided at one end of the primary protective plate close to the platform, one end of the primary protective plate is connected to the platform via the connecting plate, the other end of the primary protective plate is connected to the secondary protective plate, and the end of the secondary protective plate away from the primary protective plate is rotatably connected to the tertiary 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 member is provided between the connecting plate and the primary protective plate, and the reinforcement member is arranged at an incline.

[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 primary sleeve, a secondary sleeve, a tertiary sleeve and a fourth sleeve which are sequentially sleeved, the driving assembly includes a pulley group, a wire rope and an active oil cylinder, the pulley group includes a first pulley, a second pulley, a third pulley, a fourth pulley and a fifth pulley, the first pulley, the second pulley, the third pulley, the fourth pulley and the fifth pulley are respectively arranged at one end of the fixed sleeve, the primary sleeve, the secondary sleeve, the third sleeve and the fourth 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 primary sleeve by bypassing the cylinder rod of the active oil cylinder through the wire rope, the fixed sleeve is connected to the secondary sleeve by bypassing the second pulley through the wire rope, the primary sleeve is connected to the third sleeve by bypassing the third pulley through the wire rope, and the secondary sleeve is connected to the fourth sleeve by bypassing the fourth pulley through the wire rope.

[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 cylinder, 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 air cylinder is connected to the negative pressure air cylinder via the second connecting member, and a sealing member is provided between the second connecting member and the suction air cylinder and the negative pressure air cylinder.

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

[0015] An embodiment of the present invention provides a device for protecting and removing dust from an open-pit sidewall mining tunnel entrance. The device arranges a protection component at one end of a platform close to the mining tunnel, and arranges a telescopic component, an air suction duct, a negative pressure duct and a dust collector at the bottom of the protection component, so that the protection component can protect the telescopic component, 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. A telescopic component connected to the protection component is arranged, the telescopic component includes a telescopic arm, the telescopic arm includes a plurality of sleeves that are socketed with each other, each sleeve is provided with a bent plate, each bent plate is connected to a support frame, the negative pressure duct is arranged in the plurality of support frames, and a drive component is arranged in the sleeve, the drive The moving component can drive the sleeve to perform telescopic movement, thereby driving multiple support frames to perform reciprocating movement along the travel direction of the excavation equipment, thereby driving the negative pressure air cylinder to move toward or away from the mining tunnel. When the negative pressure air cylinder 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 cylinder 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 cylinder, the negative pressure air cylinder 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

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

[0019] Figure 2 It is a schematic diagram of the structure of the protection component according to an embodiment of the present invention;

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

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

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

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

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

[0025] Figure 8 It 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 member; 2. Telescopic assembly; 2.1. First connecting member; 2.2. Telescopic arm; 2.2.1. Fixed sleeve; 2.2.2.1. First-level sleeve; 2.2.3. Second-level sleeve; 2.2.4. Third-level sleeve ; 2.2.5, fourth-level 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 the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[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 of the embodiments.

[0029] Reference Figures 1 to 6As shown, this embodiment provides an open-pit sidewall mining tunnel mouth 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 component 1. The telescopic arm 2.2 includes a plurality of sleeves that are socketed with each other, a plurality of bent plates 2.3 are correspondingly connected to the plurality of sleeves, a plurality of support frames 2.4 are correspondingly connected to the plurality of bent plates 2.3, and a negative pressure air cylinder 5 is arranged in the support frame 2.4. A driving component is arranged in the sleeve. The driving component drives the plurality of sleeves to move toward or away from the mining tunnel, so as to drive 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 component 1 or is completely retracted to the bottom of the protective component 1.

[0030] Among them, this device arranges a protective component 1 at one end of the platform 4 close to the mining tunnel, and arranges the telescopic component 2, the suction air cylinder 3, the negative pressure air cylinder 5 and the dust collector 7 at the bottom of the protective component 1, so that the protective component 1 can protect the telescopic component 2, the suction air cylinder 3, the negative pressure air cylinder 5 and the dust collector 7 to prevent the dust removal equipment from being damaged by falling rocks or local collapse. By arranging a telescopic component 2 connected to the protective 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 sleeved 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 cylinder 5 is arranged in the plurality of support frames 2.4, and a driving component is arranged in the sleeve, and the driving component 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 cylinder 5 to move toward or away from the mining tunnel. When the negative pressure air cylinder 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 cylinder 5 moves away from the mining tunnel to be completely retracted to the bottom of the protective component 1, 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 cylinder 3, the negative pressure air cylinder 5 and the dust collector 7 into an integrated layout, which improves the compactness of the structure of this device. By adopting the telescopic component 2, adaptive dust removal is realized, which can meet various working conditions and mining processes of side mining.

[0031] Further, see Figure 2 and Figure 3As shown, the protection assembly 1 includes 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. 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. Specifically, the protection assembly 1 includes three protection plates connected in sequence. A connecting piece 1.4 is vertically provided at one end of the primary protection plate 1.1. The connecting piece 1.4 is used to connect to the platform 4, thereby realizing the connection between the primary protection plate 1.1 and the platform 4. The other end of the primary protection plate 1.1 is connected to the secondary protection plate 1.2 via bolts. 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. In other words, the tertiary protection plate 1.3 can rotate along the connection with the secondary protection plate 1.2 as the center line. The third-level protection plate 1.3 can be rotated 180° to reach the state of being expanded or retracted. When performing dust removal operation, the telescopic component 2 is extended. Before this, the third-level protection plate 1.3 is first unfolded so that the third-level protection plate 1.3 is rotated to be parallel to the second-level protection plate 1.2, so that the first-level protection plate 1.1, the second-level protection plate 1.2 and the third-level protection plate 1.3 form an integrated protection mechanism to protect the telescopic component 2, the suction duct 3, the negative pressure duct 5 and the dust collector 7 for 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 cylinder 5 to retract. After the retraction is completed, the third-level protective plate 1.3 rotates 180° 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 with an 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, and the connecting rod assembly includes a long connecting rod 1.6 and a short connecting rod 1.7 that are hingedly connected, 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. 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 arranged 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, thereby improving 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, 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 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 sequentially sleeved, the driving 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 along one end of the stretching 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 primary sleeve 2.2.2 by bypassing the cylinder rod of the active oil cylinder 2.7 through the wire rope 2.6, the fixed sleeve 2.2.1 is connected to the secondary sleeve 2.2.3 by bypassing the second pulley 2.5.2 through the wire rope 2.6, the primary sleeve 2.2.2 is connected to the tertiary sleeve 2.2.4 by bypassing the third pulley 2.5.3 through the wire rope 2.6, and the secondary sleeve 2.2.3 is connected to the quaternary sleeve 2.2.5 by bypassing the fourth pulley 2.5.4 through the wire rope 2.6. Specifically, the telescopic arm 2.2 is a four-stage telescopic mechanism, which forms a movable pulley mechanism through a pulley block 2.5 and a steel wire rope 2.6 to form a rope row 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 a circular ring 2.4.1 is arranged at the center of each of the four sides of the support frame 2.4. A hook is arranged at the position corresponding to the circular ring 2.4.1 on the circumference of the negative pressure air duct 5, and the hook is suitable for hanging on the circular ring 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 ring 2.4.1 arranged on the support frame 2.4 through the hook arranged on its circumference, and the circular ring 2.4.1 is arranged at the center 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 arranged at the open end of the hook, so that when the hook is hung on the circular ring 2.4.1, the limit plate can close the opening of the hook to prevent the hook from detaching from the circular ring 2.4.1.

[0037] Reference Figure 1 As shown, the second connecting member 6 is also included, and the suction duct 3 is connected to the negative pressure duct 5 through 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 between the second connecting member 6 and the suction duct 3 and the negative pressure duct 5, which can prevent gas leakage, ensure the stability of the airflow during dust removal work, and prevent the gas containing harmful substances from flowing into the atmosphere.

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

[0039] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be 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 will not be limited to the embodiments described herein, but should conform to the widest scope consistent with the principles and novel features invented 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); 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); The telescopic arm (2.2) is connected to a plurality of sleeves which are sleeved together, and the other end is connected to the protective assembly (1). The telescopic arm (2.2) comprises a plurality of sleeves which are sleeved together. 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, so as to drive 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).

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 one 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 hinge between the long connecting rod (1.6) and the short connecting rod (1.7).

4. The device for protecting and removing dust from an open-pit sidewall mining entrance 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 device for protecting and removing dust from an open-pit sidewall mining entrance according to claim 1 is characterized in that: 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 driving assembly includes a pulley block (2.5), a steel 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), one end of the third-stage sleeve (2.2.4) and the fourth-stage sleeve (2.2.5) 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 bypassing 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 bypassing 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 bypassing 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 bypassing the fourth pulley (2.5.4) through the steel wire rope (2.6).

7. The device for protecting and removing dust from an open-pit sidewall mining entrance according to claim 1 is characterized in that: The support frame (2.4) is rectangular, and circular rings (2.4.1) are arranged at the centers of the four sides of the support frame (2.4). A hook is arranged at a position corresponding to the circular ring (2.4.1) on the circumference of the negative pressure air cylinder (5), and the hook is suitable for hanging on the circular ring (2.4.1).

8. The device for protecting and removing dust from the open-pit sidewall mining entrance according to claim 7 is characterized in that: The open end of the hook is hingedly connected to a limiting plate.

9. The device for protecting and removing dust from an open-pit sidewall mining entrance according to claim 1 is characterized in that: It also includes a second connecting member (6), the suction air cylinder (3) is connected to the negative pressure air cylinder (5) via the second connecting member (6), and sealing members are provided between the second connecting member (6) and the suction air cylinder (3) and the negative pressure air cylinder (5).

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