Extension ladder installed on hydraulic support and using method thereof

Abstract

The invention discloses an extension ladder installed on a hydraulic support and a using method of the extension ladder, and belongs to the field of coal mining auxiliary equipment. Four sets of connecting blocks are arranged, and multiple sets of side rods are detachably installed on the surfaces, close to each other, of the left set of connecting blocks and the right set of connecting blocks; first connectors which are symmetrically arranged up and down are evenly installed on the surfaces, close to each other, of the front side rod and the rear side rod, foot rest levers are hinged to the middles of the upper first connector and the lower first connector, second connectors are installed on the surfaces, away from each other, of the left connecting block and the right connecting block, and the second connectors are connected with a hydraulic support foot rest through hinges. Through the arrangement of the telescopic side rod structures and the hinge connection mode with the hydraulic supports, the hydraulic support moving device can effectively adapt to the distance change of the hydraulic supports in the support moving process, it is guaranteed that workers safely move between the hydraulic supports, the mobility of the workers is improved, and the working efficiency is improved. The problem that moving of workers is blocked when the hydraulic supports are pushed on a large-dip-angle working face can be effectively solved, and reliable guarantee is provided for safe passing of the workers between the hydraulic supports.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mining auxiliary equipment, and particularly relates to a telescopic ladder installed on a hydraulic support and a use method thereof. Background Art

[0002] Hydraulic supports, the most widely used equipment in coal mining, bear the heavy responsibility of supporting the roof of the coal face and maintaining a safe working space. During coal mining, as the coal seam is removed, the hydraulic supports are sequentially advanced. During this process, the distance difference between the hydraulic supports can severely hinder worker movement between them in steeply inclined working faces. This hinders worker movement between the hydraulic supports during mining, not only impacting material transportation and personnel mobility, but also preventing timely evacuation or avoiding sudden roof fall or other hazards in emergencies. Therefore, ensuring the safe movement of workers between the hydraulic supports is crucial. Summary of the Invention

[0003] The object of the present invention is to provide a telescopic ladder installed on a hydraulic support and a method of using the same, so as to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a telescopic ladder installed on a hydraulic support, comprising connecting blocks, wherein the connecting blocks are provided in four groups, and the surfaces of the left and right groups of connecting blocks that are close to each other are detachably installed with multiple groups of side rods, and the surfaces of each group of front and rear side rods that are close to each other are evenly installed with connectors 1 that are symmetrically arranged up and down, and a foot rod is hinged in the middle of the upper and lower groups of connectors 1, and the surfaces of the left and right groups of connecting blocks that are away from each other are both installed with connectors 2, and connectors 2 are connected to the foot pedal of the hydraulic support through a hinge.

[0005] Preferably, a socket is provided on one side outer wall of each group of side rods, a connecting rod is fitted inside the socket, and one side outer wall of the connecting rod is connected to the other side outer wall of the adjacent side rod, the front side of the front side rod and the back side of the rear side rod are both provided with connecting holes, and the connecting holes are communicated with one side inner wall of the socket, the front side of the front connecting rod and the back side of the rear connecting rod are both installed with limiting components, and the limiting components are located inside the connecting holes, and the limiting components are used to remove any group of side rods from other side rods.

[0006] Preferably, elastic pull belt 1 and elastic pull belt 2 are respectively installed on the inner walls on both sides of the connecting hole, and elastic pull belt 1 and elastic pull belt 2 are arranged one in front and one behind. Connecting rings are installed through the front sides of the elastic pull belt 1 and the elastic pull belt 2, and the connecting rings are sleeved on the outer surface of the limiting component.

[0007] Preferably, the limiting assembly includes limiting holes arranged on the front side of the front connecting rod and the back side of the rear connecting rod, a blocking rod and a spring are installed on the inner wall of one side of the limiting hole, and the spring is located on the outside of the blocking rod, a limiting rod is installed on one end of the spring, and the limiting rod is located on the inside of the limiting hole, a blocking hole is provided at one end of the limiting rod, and the diameter of the blocking hole is smaller than the inner diameter of the spring, and the blocking rod is located inside the blocking hole.

[0008] Preferably, the connection hole is in the shape of an elongated strip, and the edge of the connection hole is in the shape of an outwardly expanding trumpet.

[0009] Preferably, a slot is provided on the inner wall of the other side of the jack, and sliders are installed on the back side of the front connecting rod and the front side of the rear connecting rod, and the sliders are located inside the slot.

[0010] Preferably, a storage groove is provided on the top of each group of side bars, and a steel tube skeleton track is embedded in the storage groove. The steel tube skeleton track is used to improve the bending strength of the side bars. The steel tube skeleton track can also be combined with a material transport trolley.

[0011] Preferably, when the connecting rod is pulled out to the left in the insertion hole, the limiting rod pulls the second elastic drawstring to cover the connecting hole and compresses the first elastic drawstring.

[0012] How to use the telescopic ladder:

[0013] S1. Install the prefabricated telescopic ladder at the corresponding position of the hydraulic support through connector 2 and check the reliability of the connection parts. At this time, the telescopic ladder can pass pedestrians freely;

[0014] S2. When one side of the hydraulic support moves forward, it can drive the side rod to tilt under the action of connector 2, and when the distance between the hydraulic supports becomes longer, the connecting rod is pulled out from the socket, so that the side rod of the telescopic ladder can be freely extended and retracted;

[0015] S3. When one or more sets of side bars are damaged or deformed, loosen two sets of connectors 2 and press the limit rods inwards so that the blocking rods can be inserted into the blocking holes. The limit rods compress the springs so that the limit rods are no longer located in the connecting holes. The connecting rods can then be removed from the insertion holes, and the set of side bars can then be removed from the telescopic ladder and replaced.

[0016] S4. When the hydraulic support on the other side moves forward, it can push the side bars to squeeze and contract, so that the side bars of the telescopic ladder return to their original state;

[0017] S5. The storage slots set on the side bars can be embedded in the steel tube skeleton track according to actual use needs. The embedded steel tube skeleton track can not only improve the bending strength of the side bars, but also can be combined with the material trolley, so that the material trolley can move along the track between the hydraulic supports.

[0018] In S2, when the side rod is stretched, the limit rod will pull the elastic drawstring 2 and squeeze the elastic drawstring 1, so that the elastic drawstring 2 can cover the connecting hole, thereby preventing the coal ash from entering the interior of the side rod, and the edge of the connecting hole expands outward. When workers walk on the telescopic ladder, they can shake off the coal ash accumulated on the surface of the connecting hole through vibration.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention can effectively adapt to the changes in the spacing of hydraulic supports during the frame movement process by providing a retractable side rod structure and a hinge connection with the hydraulic support, ensuring the safe and smooth movement of workers between the hydraulic supports, improving the mobility of personnel, and effectively solving the problem of obstructed movement of workers when the hydraulic supports are moved on a large-angle working surface. It provides reliable protection for the safe passage of workers between the hydraulic supports, while ensuring the smooth transportation of materials, and effectively improving the overall efficiency of coal mining operations.

[0021] 2. The side rods of the present invention are connected by connecting rods and have the function of free extension and retraction, which can well adapt to the dynamic changes in the spacing between hydraulic supports. During the frame moving process, the telescopic ladder can automatically adjust its length and always maintain a normal use state. It is not easy to be damaged, which provides strong support for the continuity of coal mining operations. At the same time, the side rods are designed to be detachable and modular, so when a group of side rods is damaged or deformed, the staff can quickly replace a single side rod according to the operating procedures without replacing the entire telescopic ladder, which greatly shortens the equipment maintenance time, reduces maintenance costs, and improves the equipment's sustainability, stability and resource utilization efficiency.

[0022] 3. When the telescopic ladder of the present invention is in use, the movement of the limit rod can drive the elastic drawstring 1 and the elastic drawstring 2 to alternately cover the connecting hole, which can effectively prevent coal ash from entering the inside of the side rod and extend the service life of the equipment. Combined with the trumpet-shaped edge design of the connecting hole, the vibration generated when the worker walks on the telescopic ladder can shake off the coal ash accumulated on the surface of the connecting hole, keep the inside of the telescopic ladder clean, and ensure its normal operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention when it is fully expanded;

[0025] Figure 3 This is a schematic diagram of the assembly structure of the side rod and the socket of the present invention;

[0026] Figure 4 Schematic diagram of the assembly structure of the side rod and the connecting rod of the present invention;

[0027] Figure 5 Schematic diagram of the assembly structure of the limit assembly of the present invention;

[0028] Figure 6 It is a partially expanded plan view of the present invention;

[0029] Figure 7 This is a plan view of the application scenario of the present invention.

[0030] In the figure: 1. Connecting block; 2. Side rod; 3. Connector 1; 4. Pedal rod; 5. Connector 2; 6. Jack; 7. Slot; 8. Connecting rod; 9. Slider; 10. Connecting hole; 11. Elastic strap 1; 12. Elastic strap 2; 13. Limiting hole; 14. Stop rod; 15. Spring; 16. Limiting rod; 17. Stop hole; 18. Storage slot. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figure 1-Figure 7 The present invention provides a telescopic ladder installed on a hydraulic support, comprising a connecting block 1, wherein the connecting block 1 is provided with four groups, and multiple groups of side rods 2 are detachably installed on the surfaces of the left and right groups of connecting blocks 1 close to each other, and connectors 1 3 symmetrically arranged up and down are evenly installed on the surfaces of each group of front and rear side rods 2 close to each other, and a foot rod 4 is hinged between the middle of the upper and lower groups of connectors 1 3, and connectors 2 5 are installed on the surfaces of the left and right groups of connecting blocks 1 away from each other, and the connectors 2 5 are connected to the foot pedal of the hydraulic support through a hinge.

[0033] Furthermore, the telescopic ladder is mainly composed of four groups of connecting blocks 1 to form a basic frame, and the surfaces of the left and right groups of connecting blocks 1 that are close to each other are equipped with multiple groups of side rods 2 in a detachable manner. This detachable design facilitates flexible adjustment of the number and combination of the side rods 2 according to the actual usage scenario and the specific layout of the hydraulic support. The foot rod 4 is hinged through connector 1 3, so that when the telescopic ladder is stretched or retracted, the foot rod 4 can be flexibly rotated and always maintain a suitable angle with the side rod 2. This hinged design allows the foot rod 4 to be folded up when not in use to save space, and can be quickly unfolded for workers to step on when in use, providing workers with a stable and comfortable stepping surface. Connector 2 5 is connected to the hydraulic support foot pedal through a hinge to ensure that the telescopic ladder can be firmly mounted on the hydraulic support and can adjust its position accordingly as the hydraulic support moves. It can not only ensure a firm connection between the telescopic ladder and the hydraulic support, but also the hinge connection method can adapt to a certain angle change of the hydraulic support.

[0034] A socket 6 is provided on the outer wall of one side of each group of side bars 2, and a connecting rod 8 is installed inside the socket 6, and the outer wall of one side of the connecting rod 8 is connected to the outer wall of the other side of the adjacent side bar 2. The front side bar 2 and the back side of the rear side bar 2 are both provided with a connecting hole 10, and the connecting hole 10 is connected to the inner wall of one side of the socket 6. The front side of the front connecting rod 8 and the back side of the rear connecting rod 8 are both installed with a limiting component, and the limiting component is located inside the connecting hole 10. The limiting component is used to remove any group of side bars 2 from the other side bars 2. The limiting component includes a limiting component set on the front side of the front connecting rod 8 and the back side of the rear connecting rod 8 Hole 13, a blocking rod 14 and a spring 15 are installed on the inner wall of one side of the limiting hole 13, and the spring 15 is located on the outside of the blocking rod 14, one end of the spring 15 is installed with a limiting rod 16, and the limiting rod 16 is located on the inner side of the limiting hole 13, one end of the limiting rod 16 is provided with a blocking hole 17, and the diameter of the blocking hole 17 is smaller than the inner diameter of the spring 15, the blocking rod 14 is located inside the blocking hole 17, the connecting hole 10 is long and the edge of the connecting hole 10 is in the shape of a trumpet that expands outward, a slot 7 is provided on the inner wall of the other side of the jack 6, and a slider 9 is installed on the back of the front connecting rod 8 and the front of the rear connecting rod 8, and the slider 9 is located inside the slot 7.

[0035] Furthermore, when one or more sets of side bars 2 are damaged or deformed, they need to be replaced in time. First, two sets of connectors 2 5 are loosened to make the relevant side bars 2 in an operable state. Then, the limiting rod 16 is squeezed inward so that the blocking rod 14 can be smoothly inserted into the blocking hole 17. During this process, the limiting rod 16 squeezes the spring 15. When the blocking rod 14 is fully inserted into the blocking hole 17, the limiting rod 16 is no longer located in the connecting hole 10. At this time, the connecting rod 8 can be easily removed from the insertion hole 6. Finally, the damaged or deformed side bar 2 is removed from the telescopic ladder and replaced with a new side bar 2. Thus, the replacement operation of the side bar 2 is completed, ensuring that the telescopic ladder can be used normally. Through the modular design, when a single side bar 2 is damaged, there is no need to replace the entire telescopic ladder, which can not only shorten the equipment maintenance time but also reduce the maintenance cost.

[0036] The matching structure of the slot 7 and the slider 9 further enhances the stability of the connection between the side bars 2. During the extension and contraction of the telescopic ladder, the slider 9 slides smoothly in the slot 7, making the relative movement between the side bars 2 smoother and more precise, reducing the shaking and friction between the side bars 2, and improving the overall performance and service life of the telescopic ladder. When removing the side bars 2, it is only necessary to push the limiting rod 16 into the limiting hole 13 and then pull out the connecting rod 8 so that the connecting rod 8 is no longer located in the insertion hole 6. At this time, the slider 9 can be removed from the slot 7 as the connecting rod 8 is removed.

[0037] The connecting hole 10 is designed to be long and strip-shaped, which provides sufficient space for the operation of the limit assembly. At the same time, the edge of the connecting hole 10 is in the shape of a trumpet that flares outward. When a worker walks on the telescopic ladder, the vibration generated by his footsteps will make it easier to shake off the coal ash accumulated on the surface of the connecting hole 10, effectively avoiding the accumulation of coal ash in the connecting hole 10 and ensuring the normal operation of the telescopic ladder structure and the reliability of the connection.

[0038] Elastic drawstring 11 and elastic drawstring 2 12 are respectively installed on the inner walls on both sides of the connecting hole 10, and elastic drawstring 11 and elastic drawstring 2 12 are arranged in front and behind. Connecting rings are installed through the front sides of elastic drawstring 11 and elastic drawstring 2 12, and the connecting rings are sleeved on the outer surface of the limiting assembly. When the connecting rod 8 is pulled out to the left in the socket 6, the limiting rod 16 pulls the elastic drawstring 2 12 to block the connecting hole 10 and compress the elastic drawstring 1 11.

[0039] Furthermore, the connecting ring is tightly sleeved on the outer surface of the limiting rod 16. During the use of the telescopic ladder, when the side rod 2 is stretched or contracted, the elastic pull belt 1 11 and the elastic pull belt 2 12 can effectively prevent impurities such as coal ash from entering the interior of the side rod 2, thereby avoiding the accumulation of impurities that affect the normal operation and structural stability of the telescopic ladder.

[0040] A storage groove 18 is provided on the top of each set of side bars 2. A steel tube skeleton track is embedded in the storage groove 18. The steel tube skeleton track is used to improve the bending strength of the side bars 2. The steel tube skeleton track can also be combined with a material transport trolley.

[0041] Furthermore, the steel tube skeleton track has multiple functions. On the one hand, it can significantly improve the bending strength of the side bar 2, enhance the overall structural stability of the telescopic ladder, and make it less likely to deform when bearing the weight of people and material loads. On the other hand, the steel tube skeleton track can also be perfectly combined with the material transport trolley, so that the material transport trolley can move smoothly along the track between the hydraulic supports, greatly facilitating the transportation of small materials on the work surface, improving work efficiency, and reducing the safety risks caused by workers carrying materials walking between hydraulic supports. The steel tube skeleton track can be made of chromium-molybdenum alloy steel, which can greatly improve the bending strength of the side bar 2 without adding too much weight, and can withstand greater pressure and deformation without being easily damaged.

[0042] The working principle and use process of the present invention are as follows: First, the four groups of connecting blocks 1 are hinged to the foot pedals of the hydraulic support through the connector 2 5 to ensure that the connection is firm and reliable. During the installation process, the tightness of each connection part is checked to avoid looseness. After the installation is completed, the telescopic ladder is in the initial state, the side bars 2 are connected by the connecting rod 8, and the foot rod 4 is unfolded for workers to use;

[0043] When the hydraulic support starts to move, if one side of the hydraulic support moves forward, the spacing between the hydraulic supports will become longer. At this time, under the action of connector 1 3 and connector 2 5, the side bar 2 will tilt as the hydraulic support moves, and as the distance increases, the hydraulic support can pull the side bar 2, so that the connecting rod 8 can be pulled out from the socket 6. At the same time, the limit rod 16 can slide in the connecting hole 10 as the connecting rod 8 moves, pulling the elastic drawstring 2 12 outward and squeezing the elastic drawstring 1 11 to contract, so that the elastic drawstring 2 12 blocks the connecting hole 10, thereby preventing coal ash from entering the inside of the side bar 2. At this time, the side bar 2 can be stretched smoothly, and the change in the angle of the foot rod 4 can be coordinated with the change in the spacing between the hydraulic supports. Workers can pass safely between the hydraulic supports through the telescopic ladder after extension;

[0044] During use, if a group of side bars 2 is found to be damaged or deformed and needs to be replaced, first loosen the two groups of connectors 2 5 related to the group of side bars 2 to temporarily release the connection between the side bars 2 and one of the hydraulic supports, then press the limit rod 16 inward, the blocking rod 14 will be inserted into the blocking hole 17, the limit rod 16 squeezes the spring 15 and disengages from the connecting hole 10, then remove the connecting rod 8 from the insertion hole 6, and the damaged side bar 2 can be removed from the telescopic ladder. After replacing the new side bar 2, follow the reverse steps to install it and restore the normal use of the telescopic ladder;

[0045] When the hydraulic support on the other side moves forward, the hydraulic support will push the side bars 2 to squeeze and contract. Under the action of the thrust, the side bars 2 gradually return to their initial state. The connecting rod 8 is reinserted into the socket 6, and the telescopic ladder returns to its initial position, ready for the next move and personnel passage.

[0046] If materials need to be transported during the actual production process, a steel pipe skeleton track can be embedded in the storage slot 18 at the top of the side bar 2. The embedded steel pipe skeleton track not only enhances the bending strength of the side bar 2, but can also be combined with the material transport trolley. Workers place materials on the material transport trolley, and the material transport trolley can move along the steel pipe skeleton track between the hydraulic supports, completing the material transportation work conveniently and quickly.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A telescopic ladder mounted on a hydraulic support, comprising a connecting block (1), wherein the connecting block (1) is provided in four groups, characterized in that: The surfaces of the left and right connecting blocks (1) that are close to each other are detachably mounted with multiple sets of side rods (2); the surfaces of each front and rear side rods (2) that are close to each other are evenly mounted with connectors (3) that are symmetrically arranged up and down; the middle of the upper and lower connectors (3) are hinged with pedal rods (4); the surfaces of the left and right connecting blocks (1) that are away from each other are both mounted with connectors (5), and the connectors (5) are connected to the hydraulic support pedals through hinges.

2. The telescopic ladder installed on a hydraulic support according to claim 1, characterized in that: A socket (6) is provided on one side outer wall of each group of side bars (2), a connecting rod (8) is fitted inside the socket (6), and one side outer wall of the connecting rod (8) is connected to the other side outer wall of the adjacent side bar (2), a connecting hole (10) is provided on the front side of the front side bar (2) and the back side of the rear side bar (2), and the connecting hole (10) is connected to the inner wall of one side of the socket (6), a limiting assembly is installed on the front side of the front side bar (8) and the back side of the rear side bar (8), and the limiting assembly is located inside the connecting hole (10), and the limiting assembly is used to remove any group of side bars (2) from other side bars (2).

3. The telescopic ladder installed on a hydraulic support according to claim 2, characterized in that: Elastic drawstring 1 (11) and elastic drawstring 2 (12) are respectively installed on the inner walls of both sides of the connecting hole (10), and elastic drawstring 1 (11) and elastic drawstring 2 (12) are arranged in front and back, and connecting rings are installed through the front of the elastic drawstring 1 (11) and the elastic drawstring 2 (12), and the connecting rings are sleeved on the outer surface of the limiting component.

4. The telescopic ladder installed on a hydraulic support according to claim 2, characterized in that: The limiting assembly comprises a limiting hole (13) arranged on the front side of the front connecting rod (8) and the back side of the rear connecting rod (8); a blocking rod (14) and a spring (15) are installed on the inner wall of one side of the limiting hole (13); the spring (15) is located on the outside of the blocking rod (14); a limiting rod (16) is installed on one end of the spring (15); the limiting rod (16) is located on the inside of the limiting hole (13); a blocking hole (17) is provided on one end of the limiting rod (16); the diameter of the blocking hole (17) is smaller than the inner diameter of the spring (15); and the blocking rod (14) is located inside the blocking hole (17).

5. The telescopic ladder installed on a hydraulic support according to claim 2, characterized in that: The connection hole (10) is in the shape of an elongated strip, and the edge of the connection hole (10) is in the shape of an outwardly expanding trumpet.

6. The telescopic ladder installed on a hydraulic support according to claim 2, characterized in that: A slot (7) is provided on the inner wall of the other side of the jack (6), and a slider (9) is installed on the back side of the front connecting rod (8) and the front side of the rear connecting rod (8), and the slider (9) is located inside the slot (7).

7. The telescopic ladder installed on a hydraulic support according to claim 1, characterized in that: A storage groove (18) is provided on the top of each group of side bars (2), and a steel tube skeleton track is embedded in the interior of the storage groove (18). The steel tube skeleton track is used to improve the bending strength of the side bars (2). The steel tube skeleton track can also be combined with a material transport trolley.

8. The telescopic ladder installed on a hydraulic support according to claim 4, characterized in that: When the connecting rod (8) is pulled out to the left in the insertion hole (6), the limiting rod (16) pulls the second elastic drawstring (12) to block the connecting hole (10) and compresses the first elastic drawstring (11).

9. A method for using a telescopic ladder installed on a hydraulic support, applicable to the telescopic ladder installed on a hydraulic support according to any one of claims 1 to 8, characterized in that: How to use the telescopic ladder: S1. Install the prefabricated telescopic ladder at the corresponding position of the hydraulic support through connector 2 (5), and check the reliability of the connection parts. At this time, the telescopic ladder can pass pedestrians freely; S2. When one side of the hydraulic support moves forward, it can drive the side rod (2) to tilt under the action of the second connector (5), and when the spacing between the hydraulic supports becomes longer, the connecting rod (8) is pulled out from the socket (6), so that the telescopic ladder side rod (2) can be freely extended and retracted; S3. When one or more sets of side bars (2) are damaged or deformed, loosen two sets of connectors (5) and press the limiting rod (16) inwards so that the blocking rod (14) can be inserted into the blocking hole (17). The limiting rod (16) presses the spring (15) so that the limiting rod (16) is no longer located in the connecting hole (10). Then, the connecting rod (8) can be taken out of the insertion hole (6), and then the set of side bars (2) can be removed from the telescopic ladder and replaced. S4. When the hydraulic support on the other side moves forward, it can push each side rod (2) to squeeze and contract, thereby restoring the side rod (2) of the telescopic ladder to its initial state; S5. The storage slot (18) provided on the side bar (2) can be embedded in the steel tube skeleton track according to actual use needs. The embedded steel tube skeleton track can not only improve the bending strength of the side bar (2), but also can be combined with the material trolley, so that the material trolley can move along the track between the hydraulic supports.

10. The method for using a telescopic ladder installed on a hydraulic support according to claim 9, characterized in that: In S2, during the stretching process of the side bar (2), the limiting rod (16) will pull the elastic drawstring 2 (12) and squeeze the elastic drawstring 1 (11), so that the elastic drawstring 2 (12) can cover the connecting hole (10), thereby preventing the coal ash from entering the interior of the side bar (2), and the edge of the connecting hole (10) expands outward, so that the worker can shake off the coal ash accumulated on the surface of the connecting hole (10) through vibration when walking on the telescopic ladder.

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