Stepping walking platform for open-pit side-hill mining

Abstract

The present application belongs to the technical field of mining equipment. In order to solve the problem that the arrangement of each mechanism in the existing walking platform of side slope mining is unreasonable and cannot meet the demand of multiple working conditions, a walking platform for open-pit side slope mining is provided, which comprises a protection mechanism, an upper platform assembly, a dust removal mechanism, a lower platform assembly, a wind supply mechanism and a discharging mechanism. The upper platform assembly is connected with the lower platform assembly to form a whole, the protection mechanism, the dust removal mechanism and the wind supply mechanism are all arranged on the upper platform assembly, the protection mechanism is arranged at one end of the upper platform assembly close to the mining tunnel, the dust removal mechanism and the wind supply mechanism are connected, and the discharging mechanism is arranged at one end of the lower platform assembly away from the mining tunnel. The walking platform has compact structure and simple operation, meets the process requirements of dust removal and discharging of the open-pit mine, the protection requirements of the platform, and the working requirements under each working condition, realizes the green mining of side slope coal compression, and ensures the rationality and practicality of the whole platform structure.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mining equipment, and particularly relates to a step-by-step walking platform for open-pit side-hill mining. BACKGROUND

[0002] An open-pit coal mine refers to a mine in which coal deposited on the ground or in a shallow layer is mined by directly stripping the surface soil. In some geologically soft areas, landslides easily occur in mountains, and therefore, a gentle slope mining method is generally used. However, this method generally produces a large amount of side-hill pressure coal, resulting in serious waste of coal resources.

[0003] As a main method for solving side-hill pressure coal, side-hill mining is widely used in open-pit coal mines. The working principle of side-hill mining is similar to that of single-lane tunneling in an underground mine. A continuous miner is used to gradually tunnel inward from the side-hill gentle slope side to mine out the side-hill pressure coal. During the mining process, the advancement and withdrawal of the entire system transportation and cutting equipment, the movement of the entire equipment when a mining lane is newly selected, and the arrangement and protection of a dust removal system, an electrical system, and a hydraulic system, as well as the transfer of materials in front of the conveyor, need to be implemented on a step-by-step walking platform. SUMMARY

[0004] To solve the above technical problems, the present application provides an open-pit side-hill mining step-by-step walking platform capable of meeting the requirements of multiple working conditions.

[0005] The present application provides an open-pit side-hill mining step-by-step walking platform, which comprises a protection mechanism, an upper platform assembly, a dust removal mechanism, a lower platform assembly, a wind supply mechanism, and a material unloading mechanism. The upper platform assembly and the lower platform assembly are connected to form a whole. The protection mechanism, the dust removal mechanism, and the wind supply mechanism are all arranged on the upper platform assembly. The protection mechanism is arranged at one end of the upper platform assembly close to a mining tunnel. The dust removal mechanism and the wind supply mechanism are connected. The material unloading mechanism is arranged at one end of the lower platform assembly away from the mining tunnel.

[0006] Optionally, the upper platform assembly comprises first, second, third, fourth, fifth, and sixth platform units connected in sequence. A first cable winding drum is arranged on the first platform unit. A second cable winding drum is arranged on the second platform unit. A water pipe winding drum is arranged on the third platform unit. A hydraulic pump station is arranged on the fourth platform unit. An electrical system is arranged on the fifth platform unit. A frequency converter is arranged on the sixth platform unit.

[0007] Optionally, the lower platform assembly comprises a shovel plate, a front end, a front step mechanism, a right main beam, a transport groove, a left main beam, a rear end and a rear step mechanism, the front end is connected with the rear end into a whole through the left main beam and the right main beam, the inside of the left main beam and the right main beam is respectively provided with a pushing oil cylinder, the pushing oil cylinder controls the movement of the transport unit and the continuous mining machine, the shovel plate is arranged at one end of the front end close to the mining tunnel, the front step mechanism and the rear step mechanism are respectively arranged at the bottom of the front end and the rear end, the inside of the front step mechanism and the rear step mechanism is respectively provided with a driving member, and a guide rail is arranged between the front step mechanism and the rear step mechanism on the same side, the front step mechanism and the rear step mechanism move along the guide rail under the driving of the driving member, and the transport groove is arranged between the left main beam and the right main beam and is used for transporting materials into the unloading mechanism.

[0008] Optionally, the unloading mechanism comprises a platform unloading part, a rotary bearing, a rotary motor, an inclined unloading part, a lifting oil cylinder, a connecting frame and an elevated beam, the platform unloading part is connected with the inclined unloading part, the inner ring of the rotary bearing is arranged on the rear end, the outer ring of the rotary bearing is connected with the platform unloading part, the rotary motor is arranged on one side of the rear end, and the rotary motor is suitable for driving the rotary bearing to rotate, so as to drive the platform unloading part to rotate, the elevated beam is connected with both sides of one end of the platform unloading part close to the inclined unloading part, one end of the lifting oil cylinder is hingedly connected with the top of the elevated beam, the other end is connected with one end of the connecting frame, the other end of the connecting frame is connected with the inclined unloading part, and the lifting oil cylinder drives the inclined unloading part to rotate in the vertical plane.

[0009] Optionally, the protection mechanism comprises a primary protection, a four-bar linkage, a protection oil cylinder and a secondary protection, the secondary protection is hingedly connected to one end of the upper platform assembly close to the mining tunnel, the primary protection is connected with the secondary protection through the four-bar linkage and the protection oil cylinder, and the protection oil cylinder can drive the primary protection to expand or shrink to the bottom of the secondary protection.

[0010] Optionally, the dust removal mechanism comprises a dust remover, a negative pressure flexible air duct and an air duct telescopic arm, the air duct telescopic arm is movably arranged at the bottom of the protection mechanism, the dust remover is arranged in the upper platform assembly, the air outlet of the dust remover is connected with the air supply mechanism, the air inlet of the dust remover is connected with one end of the negative pressure flexible air duct, the other end of the negative pressure flexible air duct is connected with the air duct telescopic arm, and the air duct telescopic arm drives the negative pressure flexible air duct to move in the tunneling direction.

[0011] Optionally, the air supply mechanism comprises an air supply fan, a positive pressure flexible air duct and an air duct contraction device, the air supply fan is arranged in the upper platform assembly, an air inlet of the air supply fan is connected with an air outlet of the dust remover, an air outlet of the air supply fan is connected with one end of the positive pressure flexible air duct, the air duct contraction device is arranged at the bottom of the upper platform assembly, the other end of the positive pressure flexible air duct is connected with the transportation unit, and the positive pressure flexible air duct is arranged in the air duct contraction device, the positive pressure flexible air duct moves along the tunneling direction under the driving of the transportation unit, and the positive pressure flexible air duct moves away from the tunneling direction under the driving of the air duct contraction device.

[0012] Compared with the prior art, the technical scheme provided by the embodiment of the present application has the following beneficial effects:

[0013] The open-pit side slope mining step-by-step walking platform provided by the embodiment of the present application realizes the functions of protection, dust removal and ventilation by integrating the protection mechanism, the dust removal mechanism and the air supply mechanism on the upper platform assembly, realizes the function of transferring materials on the walking platform by connecting the unloading mechanism on the lower platform assembly, and has the advantages of compact structure, simple operation, meeting the process requirements of dust removal and unloading of the open-pit mine, the protection requirements of the platform, and the working requirements under various working conditions, realizing the green mining of the side slope coal, and ensuring the rationality and practicality of the entire platform structure. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without creative labor under the premise of not paying the creative labor.

[0016] Figure 1 The structural schematic diagram of the open-pit side slope mining step-by-step walking platform is shown in the drawings.

[0017] Figure 2 The first-stage protection expansion schematic diagram is shown in the drawings.

[0018] Figure 3 The first-stage protection retraction schematic diagram is shown in the drawings.

[0019] Figure 4 The structural schematic diagram of the upper platform assembly is shown in the drawings.

[0020] Figure 5A structural schematic diagram of a lower platform assembly according to the embodiment of the present application;

[0021] Figure 6 A structural schematic diagram of a discharging mechanism according to the embodiment of the present application.

[0022] 1, protection mechanism; 1.1, first protection; 1.2, four-bar linkage; 1.3, protection oil cylinder; 1.4, second protection; 2, upper platform assembly; 2.1, first platform unit; 2.2, second platform unit; 2.3, third platform unit; 2.4, fourth platform unit; 2.5, fifth platform unit; 2.6, sixth platform unit; 3, dust removal mechanism; 3.1, dust remover; 3.2, negative pressure flexible air duct; 3.3, air duct telescopic arm; 4, lower platform assembly; 4.1, shovel plate; 4.2, front end head; 4.3, front step mechanism; 4.4, right main beam; 4.5, middle transport groove; 4.6, left main beam; 4.7, rear end head; 4.8, rear step mechanism; 4.9, tail transport groove; 5, air supply mechanism; 5.1, air supply fan; 5.2, positive pressure flexible air duct; 5.3, air duct contraction device; 6, discharging mechanism; 6.1, platform discharging part; 6.2, rotary bearing; 6.3, rotary motor; 6.4, inclined discharging part; 6.5, lifting oil cylinder; 6.6, connecting frame; 6.7, elevated beam; 7, first cable winding roller; 8, second cable winding roller; 9, water pipe winding roller; 10, hydraulic pump station; 11, electrical system; 12, frequency converter. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0024] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein; obviously, the embodiments in the description are only some of the embodiments of the present application, not all the embodiments.

[0025] REFERENCE Figures 1 to 6As shown, the embodiment provides a step walking platform for open side slope mining, which comprises a protection mechanism 1, an upper platform assembly 2, a dust removal mechanism 3, a lower platform assembly 4, a wind supply mechanism 5 and a discharging mechanism 6. The upper platform assembly 2 is connected with the lower platform assembly 4 to form a whole, the protection mechanism 1, the dust removal mechanism 3 and the wind supply mechanism 5 are all arranged on the upper platform assembly 2, the protection mechanism 1 is arranged on one end of the upper platform assembly 2 close to the mining chamber, the dust removal mechanism 3 and the wind supply mechanism 5 are connected, and the discharging mechanism 6 is arranged on one end of the lower platform assembly 4 away from the mining chamber. Specifically, the upper platform assembly 2 and the lower platform assembly 4 are connected by bolts to form the main structure of the walking platform, the protection mechanism 1, the dust removal mechanism 3 and the wind supply mechanism 5 are integrated on the upper platform assembly 2 to realize the functions of protection, dust removal and ventilation, the discharging mechanism 6 is connected on the lower platform assembly 4 to realize the function of transferring materials on the walking platform. The walking platform has compact structure and simple operation, meets the process requirements of dust removal and discharging of the open pit, the protection requirements of the platform, and the working requirements under various working conditions, realizes the green mining of the side slope coal, and ensures the rationality and practicability of the whole platform structure.

[0026] The walking platform provided by the embodiment is applied to side slope mining, a continuous mining machine is used for tunneling mining, the continuous mining machine is connected with a transportation unit, and the transportation unit is connected with the walking platform to realize the side slope mining.

[0027] Further, referring to Figure 4 As shown, the upper platform assembly 2 comprises a first platform unit 2.1, a second platform unit 2.2, a third platform unit 2.3, a fourth platform unit 2.4, a fifth platform unit 2.5 and a sixth platform unit 2.6 connected in sequence. The first platform unit 2.1 is arranged with a first cable winding drum 7, the second platform unit 2.2 is arranged with a second cable winding drum 8, the third platform unit 2.3 is arranged with a water pipe winding drum 9, the fourth platform unit 2.4 is arranged with a hydraulic pump station 10, the fifth platform unit 2.5 is arranged with an electrical system 11, and the sixth platform unit 2.6 is arranged with a frequency converter 12. Specifically, the first cable winding drum 7 is used for storing the walking cable of the continuous mining machine, the second cable winding drum 8 is used for storing the running cable of the transportation unit, the water pipe winding drum 9 is used for winding and unwinding the cooling water pipe of the liquid cooling system, the hydraulic pump station 10 is used as the power source of the whole walking platform, the electrical system 2.6 is used for controlling the opening and closing actions of the electrical components in the whole walking platform, and the frequency converter 12 is used for controlling the air volume of the air supply fan 5.1.

[0028] Referring to Figure 5As shown, the lower platform assembly 4 comprises a shovel plate 4.1, a front head 4.2, a front step mechanism 4.3, a right main beam 4.4, a transport groove, a left main beam 4.6, a rear head 4.7 and a rear step mechanism 4.8, the front head 4.2 is connected with the rear head 4.7 through the left main beam 4.6 and the right main beam 4.4, the inside of the left main beam 4.6 and the right main beam 4.4 is provided with a pushing cylinder, the pushing cylinder controls the movement of the transport unit and the continuous mining machine, the shovel plate 4.1 is arranged at one end of the front head 4.2 close to the mining chamber, the front step mechanism 4.3 and the rear step mechanism 4.8 are arranged at the bottom of the front head 4.2 and the rear head 4.7 respectively, the inside of the front step mechanism 4.3 and the rear step mechanism 4.8 is provided with a driving member, and a guide rail is arranged between the front step mechanism 4.3 and the rear step mechanism 4.8 at the same side, the front step mechanism 4.3 and the rear step mechanism 4.8 move along the guide rail under the driving of the driving member, the transport groove is arranged between the left main beam 4.6 and the right main beam 4.4, for transporting the material to the unloading mechanism 6. Specifically, the left main beam 4.6 and the right main beam 4.4 are arranged in parallel, and the pushing cylinder is arranged in the inside of the left main beam 4.6 and the right main beam 4.4, the cylinder rod of the pushing cylinder performs telescopic movement along the tunneling direction, and the pushing cylinder works together with the traction of the continuous mining machine, so as to control the advance and retreat of the continuous mining machine and the transport unit, the front head 4.2 and the rear head 4.7 are arranged at the two ends of the left main beam 4.6 and the right main beam 4.4 respectively, so that the front head 4.2, the right main beam 4.4, the rear head 4.7 and the left main beam 4.6 are connected in turn, thereby forming the main structure of the lower platform assembly 4, the shovel plate 4.1 is arranged at the most front end of the lower platform assembly 4, which facilitates the mining equipment and the transport unit to gently downhill into the hole, the front step mechanism 4.3 and the rear step mechanism 4.8 can move along the guide rail through the inside driving member, so that the whole walking platform can be moved to the next mining chamber, the transport groove comprises a middle transport groove 4.5 and a tail transport groove 4.9, the middle transport groove 4.5 and the tail transport groove 4.9 are arranged in the middle of the lower platform assembly 4, for transferring the material transported by the transport unit to the unloading mechanism 6.

[0029] Referring to Figure 6As shown, the unloading mechanism 6 includes a platform unloading part 6.1, a rotary bearing 6.2, a rotary motor 6.3, an inclined unloading part 6.4, a lifting oil cylinder 6.5, a connecting frame 6.6 and an overhead beam 6.7, the platform unloading part 6.1 is connected with the inclined unloading part 6.4, the inner ring of the rotary bearing 6.2 is arranged on the rear end head 4.7, the outer ring of the rotary bearing 6.2 is connected with the platform unloading part 6.1, the rotary motor 6.3 is arranged on one side of the rear end head 4.7, and the rotary motor 6.3 is suitable for driving the rotary bearing 6.2 to rotate to drive the platform unloading part 6.1 to rotate, the overhead beam 6.7 is connected with both sides of one end of the platform unloading part 6.1 close to the inclined unloading part 6.4, one end of the lifting oil cylinder 6.5 is hingedly connected with the top of the overhead beam 6.7, the other end is connected with one end of the connecting frame 6.6, the other end of the connecting frame 6.6 is connected with the inclined unloading part 6.4, and the lifting oil cylinder 6.5 drives the inclined unloading part 6.4 to rotate in the vertical plane.

[0030] Referring to Figure 2 and Figure 3 As shown, the protection mechanism 1 includes a primary protection 1.1, a four-bar linkage 1.2, a protection oil cylinder 1.3 and a secondary protection 1.4, the secondary protection 1.4 is hingedly connected to one end of the upper platform assembly 2 close to the mining tunnel, the primary protection 1.1 is connected with the secondary protection 1.4 through the four-bar linkage 1.2 and the protection oil cylinder 1.3, one end of the protection oil cylinder 1.3 is hingedly connected to the bottom of the secondary protection 1.4, the other end is connected with the four-bar linkage 1.2, the four-bar linkage 1.2 is hingedly arranged at the connection between the primary protection 1.1 and the secondary protection 1.4, and the protection oil cylinder 1.3 can drive the primary protection 1.1 to unfold or shrink to the bottom of the secondary protection 1.4.

[0031] Referring to Figure 1As shown, the dust removal mechanism 3 includes a dust collector 3.1, a negative pressure flexible air duct 3.2 and an air duct telescopic arm 3.3, the air duct telescopic arm 3.3 is movably arranged at the bottom of the protection mechanism 1, the dust collector 3.1 is arranged in the upper platform assembly 2, the air outlet of the dust collector 3.1 is connected with the air supply mechanism 5, the air inlet of the dust collector 3.1 is connected with one end of the negative pressure flexible air duct 3.2, the other end of the negative pressure flexible air duct 3.2 is connected with the air duct telescopic arm 3.3, and the negative pressure flexible air duct 3.2 is driven by the air duct telescopic arm 3.3 to perform telescopic movement along the tunneling direction, that is, the negative pressure flexible air duct 3.2 can be extended into the tunnel portal or withdrawn, so that the dirty air flow in the tunnel can enter the dust collector 3.1 through the negative pressure flexible air duct 3.2 for dust removal, and the air flow after dust removal flows into the air supply mechanism 5.

[0032] Continuing to refer to Figure 1 As shown, the air supply mechanism 5 includes an air supply fan 5.1, a positive pressure flexible air duct 5.2 and an air duct contraction device 5.3, the air supply fan 5.1 is arranged in the upper platform assembly 2, the air inlet of the air supply fan 5.1 is connected with the air outlet of the dust collector 3.1, the air outlet of the air supply fan 5.1 is connected with one end of the positive pressure flexible air duct 5.2, the air duct contraction device 5.3 is arranged at the bottom of the upper platform assembly 2, the other end of the positive pressure flexible air duct 5.2 is connected with the transportation unit, and the positive pressure flexible air duct 5.2 is arranged in the air duct contraction device 5.3, the positive pressure flexible air duct 5.2 is driven by the transportation unit to move along the tunneling direction, so as to ensure that fresh air can be sent to the heading through the air supply fan 5.1, and the air flow after dust removal can be sent to the heading, so as to ensure the ventilation effect in the whole tunnel, and the positive pressure flexible air duct 5.2 is driven by the air duct contraction device 5.3 to move away from the tunneling direction, so as to retract the positive pressure flexible air duct 5.2, thereby avoiding affecting the movement of the whole walking platform.

[0033] It should be noted that, in this document, relational terms such as“first” and“second”, and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms“comprises”,“comprising”, or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by“comprises a...” does not, without more constraints, foreclose the existence of additional identical elements or the addition of other elements, whether related or unrelated to those elements or not.

[0034] The foregoing is considered as illustrative only of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, and it is intended to embrace all such modifications and changes that fall within the scope of the application. Accordingly, the application is not to be restricted in scope to the specific embodiments disclosed herein but is to be accorded the full scope that the principles and novel features request appropriately granted.

Claims

1. A step walkway for open-pit benching mining, characterised in that, The device comprises a protection mechanism, an upper platform assembly, a dust removal mechanism, a lower platform assembly, a wind supply mechanism and a discharging mechanism, the upper platform assembly is connected with the lower platform assembly to form a whole, the protection mechanism, the dust removal mechanism and the wind supply mechanism are all arranged on the upper platform assembly, the protection mechanism is arranged on one end of the upper platform assembly close to the mining tunnel, the dust removal mechanism and the wind supply mechanism are connected, and the discharging mechanism is arranged on one end of the lower platform assembly away from the mining tunnel; The dust removal mechanism comprises a dust remover, a negative pressure flexible air duct and an air duct telescopic arm, the air duct telescopic arm is movably arranged at the bottom of the protection mechanism, the dust remover is arranged in the upper platform assembly, the air outlet of the dust remover is connected with the wind supply mechanism, the air inlet of the dust remover is connected with one end of the negative pressure flexible air duct, the other end of the negative pressure flexible air duct is connected with the air duct telescopic arm, and the negative pressure flexible air duct is driven to move along the tunneling direction through the air duct telescopic arm; The wind supply mechanism comprises a wind supply fan, a positive pressure flexible air duct and an air duct contraction device, the wind supply fan is arranged in the upper platform assembly, the air inlet of the wind supply fan is connected with the air outlet of the dust remover, the air outlet of the wind supply fan is connected with one end of the positive pressure flexible air duct, the air duct contraction device is arranged at the bottom of the upper platform assembly, the other end of the positive pressure flexible air duct is connected with the transportation unit, and the positive pressure flexible air duct is arranged in the air duct contraction device, the positive pressure flexible air duct is driven to move along the tunneling direction by the transportation unit, and the positive pressure flexible air duct is driven to move away from the tunneling direction by the air duct contraction device; The lower platform assembly comprises a right main beam, a transportation groove, a left main beam and a rear end head, the inside of the left main beam and the right main beam are both provided with a pushing oil cylinder, the pushing oil cylinder controls the movement of the transportation unit and the continuous mining machine, the transportation groove is arranged between the left main beam and the right main beam, and the transportation groove comprises a middle transportation groove and a tail transportation groove and is used for conveying materials to the discharging mechanism; The discharging mechanism comprises a platform discharging part, a rotary bearing, a rotary motor, an inclined discharging part, a lifting oil cylinder, a connecting frame and a high beam, the platform discharging part is connected with the inclined discharging part, the discharge outlet of the tail transportation groove is arranged corresponding to the platform discharging part, the inner ring of the rotary bearing is arranged on the rear end head, the outer ring of the rotary bearing is connected with the platform discharging part, the rotary motor is arranged on one side of the rear end head, the rotary motor is suitable for driving the rotary bearing to rotate, so as to drive the platform discharging part to rotate, the high beam is connected with both sides of one end of the platform discharging part close to the inclined discharging part, one end of the lifting oil cylinder is hingedly connected with the top of the high beam, the other end is connected with one end of the connecting frame, the other end of the connecting frame is connected with the inclined discharging part, and the lifting oil cylinder drives the inclined discharging part to rotate in the vertical plane.

2. A step walkway for open pit and bench mining according to claim 1, characterised in that, The upper platform assembly comprises a first platform unit, a second platform unit, a third platform unit, a fourth platform unit, a fifth platform unit and a sixth platform unit connected in sequence, the first platform unit is arranged with a first cable winding roller, the second platform unit is arranged with a second cable winding roller, the third platform unit is arranged with a water pipe winding roller, the fourth platform unit is arranged with a hydraulic pump station, the fifth platform unit is arranged with an electrical system, and the sixth platform unit is arranged with a frequency converter.

3. A step walkway for open pit and bench mining according to claim 1, characterised in that, The lower platform assembly comprises a shovel plate, a front end head, a front stepping mechanism and a rear stepping mechanism, the front end head is connected with the rear end head into one through the left main beam and the right main beam, the shovel plate is arranged at one end of the front end head close to the mining tunnel, the front stepping mechanism and the rear stepping mechanism are arranged at the bottom of the front end head and the rear end head respectively, the inside of the front stepping mechanism and the rear stepping mechanism is arranged with a driving member, and a guide rail is arranged between the front stepping mechanism and the rear stepping mechanism at the same side, the front stepping mechanism and the rear stepping mechanism move along the guide rail under the driving of the driving member.

4. A step walkway for open pit and bench mining according to claim 1, characterised in that, The protection mechanism comprises a first protection, a four-bar linkage, a protection oil cylinder and a second protection, the second protection is hingedly connected to one end of the upper platform assembly close to the mining tunnel, the first protection is connected with the second protection through the four-bar linkage and the protection oil cylinder, and the protection oil cylinder can drive the first protection to expand or shrink to the bottom of the second protection.

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