protective devices

Abstract

The application provides a protection device, which comprises a telescopic frame, a protection net and a hydraulic part. The telescopic frame comprises a first cross beam, a second cross beam and a sliding piece. The sliding piece comprises a first longitudinal beam and a second longitudinal beam. The first cross beam and the second cross beam are fixedly connected with rock bodies on both sides of a crack. One end of the first longitudinal beam is fixedly connected with the first cross beam, and one end of the second longitudinal beam is fixedly connected with the second cross beam. The other end of the first longitudinal beam is slidingly connected with the other end of the second longitudinal beam. The protection net is fixedly arranged on the telescopic frame and shields a gap between the first cross beam and the second cross beam. The hydraulic part comprises a hydraulic cylinder and a telescopic rod which is telescopically arranged on the hydraulic cylinder. The first cross beam and the second cross beam are connected through the hydraulic part. Through the technical scheme, the problem that the protection device in the related art cannot be adjusted along with the increase of the crack and is prone to losing the protection effect can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of mining damage and mine ecological restoration, and in particular to a protective device. Background Art

[0002] In coal mining work, people mine coal seams. Improper mining can easily cause damage to the surface, which in turn causes cracks. The cracks gradually expand under the influence of artificial mining, which can easily cause geological disasters. Therefore, protective devices need to be installed for protection.

[0003] In the related art, by setting a protective device around the cracks in the ground, it is possible to prevent the cracks from continuing to expand.

[0004] However, the protective device in the related art cannot be adjusted as the crack grows, which may easily lead to the failure of the protective function of the protective device. Summary of the Invention

[0005] The present invention provides a protective device to solve the problem in the related art that the protective device cannot be adjusted as the crack increases, which easily leads to the failure of the protective function of the protective device.

[0006] The present invention provides a protective device, which includes: a telescopic frame, including a first crossbeam, a second crossbeam and a sliding member, the sliding member includes a first longitudinal beam and a second longitudinal beam, the first crossbeam and the second crossbeam are respectively fixedly connected to the rock masses on both sides of the crack, one end of the first longitudinal beam is fixedly connected to the first crossbeam, one end of the second longitudinal beam is fixedly connected to the second crossbeam, and the other end of the first longitudinal beam is slidably connected to the other end of the second longitudinal beam; a protective net is fixedly arranged on the telescopic frame and blocks the gap between the first crossbeam and the second beam; a hydraulic component, including a hydraulic cylinder and a telescopic rod telescopically arranged on the hydraulic cylinder, and the first crossbeam and the second beam are connected through the hydraulic component.

[0007] Furthermore, the first longitudinal beam is a concave longitudinal beam, the second longitudinal beam is a convex longitudinal beam, the convex longitudinal beam is embedded in the concave longitudinal beam and can slide relative to the concave longitudinal beam, and the convex longitudinal beam and the concave longitudinal beam are matched with a limit position in a direction perpendicular to their axial directions.

[0008] Furthermore, the telescopic frame includes two sliding members, wherein one sliding member is arranged at the first end of the first crossbeam and the second crossbeam, and the other sliding member is arranged at the second end of the first crossbeam and the second crossbeam.

[0009] Furthermore, the protective device also includes multiple columns, which are arranged one by one at multiple corners of the telescopic frame. The bottom of the column is fixedly connected to the ground, the first longitudinal beam is fixedly connected to the top of its corresponding column, and the second longitudinal beam is fixedly connected to the top of its corresponding column.

[0010] Furthermore, the protective device also includes an anchor cable, the column has a mounting hole provided therethrough, and the anchor cable is passed through the mounting hole.

[0011] Furthermore, the telescopic frame also includes a base, which is fixedly arranged on the ground, the lower end of the column is fixedly connected to the base, and the protective net is located between the base and the telescopic frame.

[0012] Furthermore, the protective device includes two hydraulic components, which are respectively arranged on both sides of the sliding component.

[0013] Furthermore, the telescopic rod includes a first telescopic rod and a second telescopic rod respectively located on both sides of the hydraulic cylinder, the first end of the first telescopic rod is fixedly connected to the first cross beam, the first end of the second telescopic rod is fixedly connected to the second cross beam, and the second end of the first telescopic rod and the second end of the second telescopic rod are respectively connected to the hydraulic cylinder.

[0014] Furthermore, the telescopic frame is made of nickel steel; and / or the protective net includes a steel wire mesh.

[0015] Furthermore, the protective device includes a plurality of telescopic frames, and the plurality of telescopic frames are arranged in sequence along the extension direction of the crack.

[0016] According to the technical solution of the present invention, the protective device includes a telescopic frame, a protective net and a hydraulic component. The first crossbeam and the second crossbeam in the telescopic frame are respectively fixedly arranged on the rock masses on both sides of the crack, one end of the first longitudinal beam is fixedly connected to the first crossbeam, one end of the second longitudinal beam is fixedly connected to the second crossbeam, and the other end of the first longitudinal beam is slidably connected to the other end of the second longitudinal beam, so that the first longitudinal beam and the second longitudinal beam constitute a sliding member. When the crack expands, the sliding member can slide to adapt to the expansion and deformation of the crack, and a protective net is provided on the telescopic frame, and the protective net can block the crack to prevent the protective device from failing due to the expansion of the crack, so that the telescopic frame can slide with the expansion of the crack under the action of the protective net, and can also prevent gravel from sliding under the action of the protective net. Among them, hydraulic parts are arranged on the telescopic frame, and the first crossbeam and the second crossbeam are connected by the hydraulic parts, so that under the action of the hydraulic parts, the sliding part can be easily extended and retracted, and at the same time, a restraining force can be generated on the expansion of the crack, thereby preventing the crack from expanding too much. By arranging the hydraulic parts, it can be ensured that when the sliding part adapts to the tensile deformation of the crack, the tensile deformation is prevented from being too large, thereby limiting the excessive expansion of the crack, and thus the deformation of the rock mass around the crack can be controlled within a reasonable range, thereby playing a protective role and improving the practicality and reliability of the protective device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 A schematic diagram of a protective device provided according to an embodiment of the present invention is shown;

[0019] Figure 2 A schematic structural diagram of a telescopic frame provided in an embodiment of the present invention is shown;

[0020] Figure 3 shows a cross-sectional view of a sliding member provided according to an embodiment of the present invention;

[0021] Figure 4 A schematic diagram showing the insertion and anchoring of an anchor cable provided by an embodiment of the present invention into a rock mass;

[0022] Figure 5 A schematic diagram of a lock provided according to an embodiment of the present invention is shown.

[0023] The above drawings include the following reference numerals:

[0024] 10. Telescopic frame; 11. First crossbeam; 12. Second crossbeam; 13. Sliding member; 131. First longitudinal beam; 1311. Concave longitudinal beam; 132. Second longitudinal beam; 1321. Concave longitudinal beam;

[0025] 20. Protective net; 21. Wire mesh;

[0026] 30. Hydraulic component; 31. Hydraulic cylinder; 32. Telescopic rod; 321. First telescopic rod; 322. Second telescopic rod;

[0027] 41. Column; 42. Anchor cable; 421. Anchoring structure; 422. Sealing structure;

[0028] 50. Cracks;

[0029] 60. Lock; 61. Grouting hole. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. 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.

[0031] like Figures 1 to 5As shown, an embodiment of the present invention provides a protective device, which includes a telescopic frame 10, a protective net 20 and a hydraulic component 30. The telescopic frame 10 includes a first crossbeam 11, a second crossbeam 12 and a sliding component 13. The sliding component 13 includes a first longitudinal beam 131 and a second longitudinal beam 132. The first crossbeam 11 and the second crossbeam 12 are respectively fixedly connected to the rock masses on both sides of the crack 50, one end of the first longitudinal beam 131 is fixedly connected to the first crossbeam 11, one end of the second longitudinal beam 132 is fixedly connected to the second crossbeam 12, and the other end of the first longitudinal beam 131 is slidably connected to the other end of the second longitudinal beam 132. The protective net 20 is fixedly set on the telescopic frame 10 and blocks the gap between the first crossbeam 11 and the second crossbeam 12. The hydraulic component 30 includes a hydraulic cylinder 31 and a telescopic rod 32 telescopically set on the hydraulic cylinder 31. The hydraulic cylinder 31 is fixedly connected to one of the first crossbeam 11 and the second crossbeam 12, and the telescopic rod 32 is fixedly connected to the other of the first crossbeam 11 and the second crossbeam 12.

[0032] The protective device provided in this embodiment is applied, which includes a telescopic frame 10, a protective net 20 and a hydraulic component 30. The first crossbeam 11 and the second crossbeam 12 in the telescopic frame 10 are respectively fixedly arranged on the rock masses on both sides of the crack 50, one end of the first longitudinal beam 131 is fixedly connected to the first crossbeam 11, one end of the second longitudinal beam 132 is fixedly connected to the second crossbeam 12, and the other end of the first longitudinal beam 131 is slidably connected to the other end of the second longitudinal beam 132, so that the first longitudinal beam 131 and the second longitudinal beam 132 constitute a sliding member 13. When the crack 50 expands, the sliding member 13 can slide, thereby adapting to the expansion and deformation of the crack 50, and a protective net 20 is set on the telescopic frame 10, and the protective net 20 can block the crack 50 to prevent the expansion of the crack 50 from causing the protective device to fail, so that the telescopic frame 10 can slide with the expansion of the crack 50 under the action of the protective net 20, and can also prevent gravel from sliding under the action of the protective net 20. Among them, a hydraulic component 30 is set on the telescopic frame 10, and the first crossbeam 11 and the second crossbeam 12 are connected by the hydraulic component 30, so that under the action of the hydraulic component 30, the sliding component 13 can be easily extended and retracted, and at the same time, a restraining force can be generated on the expansion of the crack 50, thereby preventing the crack 50 from expanding too much. By setting the hydraulic component 30, it can be ensured that when the sliding component 13 adapts to the tensile deformation of the crack 50, the tensile deformation is prevented from being too large, thereby limiting the excessive expansion of the crack 50, and thus the deformation of the rock mass around the crack 50 can be controlled within a reasonable range, thereby playing a protective role and improving the practicality and reliability of the protective device.

[0033] It should be noted that the protective device provided by this embodiment can, on the one hand, prevent the protective device from being damaged and ineffective due to excessive cracks 50, thereby losing its protective function. On the other hand, it can effectively adapt to the enlargement of cracks 50 while keeping the development of cracks 50 within a controllable range, thereby achieving a protective effect.

[0034] It should be noted that the distance between the first crossbeam 11 and the second crossbeam 12 is 6 m, so that the protection net 20 can cover the crack 50 and thus play a protective role to prevent the problem of gravel sliding as the crack expands.

[0035] like Figure 2 and Figure 3 As shown, the first longitudinal beam 131 is a concave longitudinal beam 1311, and the second longitudinal beam 132 is a convex longitudinal beam 1321. The convex longitudinal beam 1321 is embedded in the concave longitudinal beam 1311 and can slide relative to the concave longitudinal beam 1311. The convex longitudinal beam 1321 and the concave longitudinal beam 1311 are limited in position in a direction perpendicular to their axes. With the above structure, the convex longitudinal beam 1321 is embedded in the concave longitudinal beam 1311, and the convex longitudinal beam 1321 can slide relative to the concave longitudinal beam 1311, making the sliding structure simple. In addition, the convex longitudinal beam 1321 and the concave longitudinal beam 1311 are limited in position in a direction perpendicular to the axis, thereby ensuring that the sliding member 13 can only slide, thereby improving the structural reliability of the sliding member 13.

[0036] It should be noted that the convex longitudinal beam 1321 is embedded in the concave longitudinal beam 1311 and is limited in the vertical axial direction, so that the sliding member 13 can slide, and thus the telescopic frame 10 can adapt to the tensile stress in the process of continuous cracking of the crack 50, and the hydraulic member 30 is provided to buffer the tensile stress generated when the crack 50 cracks, thereby protecting the telescopic frame 10.

[0037] like Figure 2 As shown, the telescopic frame 10 includes two sliding members 13, one of which is disposed at the first end of the first crossbeam 11 and the second crossbeam 12, and the other is disposed at the second end of the first crossbeam 11 and the second crossbeam 12. The telescopic frame 10 employing the above-described structure, by providing the two sliding members 13, can adapt to the expansion and deformation of the crack 50. Furthermore, the two sliding members 13 slide to varying degrees as the crack 50 expands and deforms, thereby improving the practicality of the telescopic frame 10.

[0038] It should be noted that by providing two sliding members 13, the telescopic frame 10 can adapt to the expansion and deformation of the crack 50, thereby preventing the increase of the crack 50 from causing the protective function of the protective device to fail, and the two sliding members 13 can control the development degree of the crack 50 within a controllable range, thereby playing a protective role.

[0039] like Figure 1 and Figure 2 As shown, the protective device further includes a plurality of columns 41, which are arranged one by one at the corners of the telescopic frame 10. The bottom of the column 41 is fixedly connected to the ground, the first longitudinal beam 131 is fixedly connected to the top of its corresponding column 41, and the second longitudinal beam 132 is fixedly connected to the top of its corresponding column 41. With the above structure, by providing a plurality of columns 41, the bottom of the column 41 is fixed to the ground, the first longitudinal beam 131 is fixedly connected to the top of the corresponding column 41, and the second longitudinal beam 132 is fixedly connected to the top of the corresponding column 41, so that the sliding member 13 is arranged on the top of the column 41, which facilitates the installation and removal of the protective device. In addition, the use of a plurality of columns 41 can improve the stability of the protective device.

[0040] like Figure 2 and Figure 4 As shown, the protective device further includes an anchor cable 42. The column 41 has a mounting hole extending therethrough, and the anchor cable 42 is inserted through the mounting hole. By installing the anchor cable 42 and inserting the anchor cable 42 into the mounting hole of the column 41, the anchor cable 42 can be anchored to the ground when the column 41 is installed on the ground. This not only improves the structural strength of the rock mass around the crack 50 and slows down the expansion and deformation of the crack 50, but also improves the structural stability of the protective device and facilitates the assembly of the anchor cable 42.

[0041] In this embodiment, the telescopic frame 10 further includes a base, which is fixedly mounted on the ground. The lower ends of the uprights 41 are fixedly connected to the base, and the protective net 20 is located between the base and the telescopic frame 10. By providing the base, the base is fixedly connected to the ground, and the bottoms of the uprights 41 are fixedly connected to the base, which facilitates installation and removal of the uprights 41. Furthermore, the protective net 20 is disposed between the base and the telescopic frame 10, so that in the event of rock debris sliding, the protective net 20 can provide protection. Furthermore, the base and the telescopic frame 10 can limit the protective net 20 to prevent it from falling out of the protective device.

[0042] It should be noted that the bottom of the column 41 is fixed to the base by screws. The diameter of the column 41 is 10 cm, and the size of the base is 40 cm × 40 cm. The base has a through hole connected to the mounting hole of the column 41. The anchor cable 42 can pass through the through hole of the base and be inserted into the rock mass for anchoring. The bottom of the column 41 is fixed to the base by screws, thereby making the connection structure between the column 41 and the base stable.

[0043] In this embodiment, the protective device also includes a lock 60, which is provided with multiple anchor holes. The lock 60 is set on the base, and the steel strands of multiple anchor cables 42 are passed through the anchor holes on the lock 60. The diameter of the steel strand is 22.6 cm and the length is greater than or equal to 8.3 m. In this way, it can enter the rock on both sides of the crack 50 for anchoring. The lock 60 can lock multiple anchor cables 42 to ensure that the anchor cables 42 are firmly installed.

[0044] Specifically, the center of the anchor cable 42 has a hollow grouting pipe and the periphery is a steel strand. When the anchor cable 42 enters the rock mass, grouting is performed into the grouting hole 61 through the hollow grouting pipe. The steel strand of the anchor cable 42 and the slurry entering the grouting hole 61 together form an anchoring structure 421, which can then be anchored to the surrounding rock mass, thereby improving the structural strength of the rock mass and ensuring the structural stability of the protective device. In order to increase the service life of the anchor cable 42, a sealing structure 422 is provided at the front end of the anchor cable 42. The sealing structure is composed of a flexible sealing plastic film and a blended fabric to prevent corrosion of the anchor cable 42 and increase the service life of the anchor cable 42.

[0045] like Figure 2 As shown, the protective device includes two hydraulic components 30, which are respectively arranged on either side of the sliding member 13. By providing two hydraulic components 30, respectively arranged on the left and right sides of the sliding member 13, when the sliding member 13 slides, the hydraulic components 30 on the left and right sides of the sliding member 13 can play a telescopic role. Under the action of the hydraulic components 30, the sliding member 13 can be controlled to slide, and under the action of the two sliding members 13, the expansion and deformation of the crack 50 can be restrained, thereby slowing the expansion and deformation cycle of the crack 50.

[0046] like Figure 2 As shown, the telescopic rod 32 includes a first telescopic rod 321 and a second telescopic rod 322, respectively located on either side of the hydraulic cylinder 31. The first end of the first telescopic rod 321 is fixedly connected to the first crossbeam 11, the first end of the second telescopic rod 322 is fixedly connected to the second crossbeam 12, and the second ends of the first telescopic rod 321 and the second end of the second telescopic rod 322 are respectively connected to the hydraulic cylinder 31. With this structure, the first telescopic rod 321 is connected to the first crossbeam 11, and the second telescopic rod 322 is connected to the second crossbeam 12, so that the first crossbeam 11 and the second crossbeam 12 can be controlled to extend and retract under the control of the hydraulic cylinder 31. The first telescopic rod 321 and the second telescopic rod 322 can also restrain the telescopic frame 10, preventing the crack 50 from expanding excessively.

[0047] In this embodiment, the telescopic frame 10 is made of nickel steel. This material provides excellent compressive strength, preventing the telescopic frame 10 from failing to provide protection when gravel falls. Furthermore, the telescopic frame 10 is strong and tough, ensuring long-term use. This extends the life of the protective device while also improving the overall structural strength.

[0048] It should be noted that the telescopic frame 10 is made of a cold-drawn seamless square steel pipe. The length of the square steel pipe is 16 cm and the wall thickness of the steel pipe is 1.5 cm.

[0049] In this embodiment, the protective net 20 includes a wire mesh 21. The wire mesh 21 is provided to provide good protection due to its scalability. The wire mesh 21 also has good shock resistance and crack resistance, so that the protective net 20 can protect against falling rocks.

[0050] It should be noted that the size of the steel mesh 21 is 30 cm×30 cm, and the steel mesh 21 can be set on the upper surface of the telescopic frame 10 .

[0051] like Figure 1 As shown, the protective device includes multiple telescopic frames 10, which are arranged in sequence along the extension direction of the crack 50. By arranging multiple telescopic frames 10, multiple telescopic frames 10 are arranged on both sides of the crack 50, which can protect the extension direction of the crack 50, preventing the rock mass on both sides of the crack 50 from moving and deforming too much, thereby achieving a protective effect.

[0052] It should be noted that the steps for installing the protective device of this embodiment are as follows:

[0053] (1) Conduct an on-site survey of the crack 50: First, conduct an on-site survey of the development environment of the crack 50, including the development location, the topography at the development location, the surrounding conditions, the properties of the topsoil layer, the occurrence of the underlying rock layer of the crack 50, and the hydrogeological conditions; second, record the extension direction and length, development width, and drop of the crack 50 in detail; third, level the land according to the conditions of the rock and soil on both sides of the crack 50 to lay the foundation for the installation of protective devices;

[0054] (2) Determine the installation point: First, based on the leveling of the land, design the specifications and dimensions of the protective device according to the development of the crack 50, and determine the width and length of the protective device; then, determine the anchoring point of the anchor cable 42 according to the extension direction of the crack 50 and the leveling of the land, and perform drilling;

[0055] (3) Installation of protective devices: First, drill holes at appropriate locations on the rock mass on both sides of the crack 50, with the aim of anchoring the underlying rock strata of the crack 50 through the anchor cable 42, thereby improving the physical and mechanical properties of the underlying rock strata. The construction parameters are: the diameter of the hole is 120 cm, the depth of the hole is 8.3 m, and the base is fixed with screws; secondly, the first longitudinal beam 131 is installed and connected to the second longitudinal beam 132; wherein, the concave longitudinal beam 1311 is connected to the top of the column 41 through the hydraulic cylinder 31, and the hydraulic cylinder 31 provides horizontal pulling and thrust by telescoping, thereby realizing the relative sliding between the concave longitudinal beam 1311 and the convex longitudinal beam 1321; finally, the frame structure is assembled, and the protective net 20 is laid on the upper surface of the telescopic frame 10.

[0056] The device provided by the embodiment has the following beneficial effects:

[0057] (1) The first longitudinal beam 131 and the second longitudinal beam 132 constitute a sliding member 13. When the crack 50 expands, the sliding member 13 can slide to adapt to the expansion and deformation of the crack 50. A protective net 20 is provided on the telescopic frame 10 to prevent gravel from sliding down.

[0058] (2) The convex longitudinal beam 1321 is embedded in the concave longitudinal beam 1311, so that the sliding member 13 can slide, thereby enabling the telescopic frame 10 to adapt to the tensile stress during the continuous cracking of the crack 50, and the hydraulic member 30 is provided to buffer the tensile stress generated when the crack 50 cracks, thereby protecting the telescopic frame 10;

[0059] (3) Anchor cables 42 are provided and inserted into the mounting holes of the columns 41 so that the anchor cables 42 can be anchored to the ground. This can not only improve the structural strength of the rock mass around the crack 50 and slow down the expansion and deformation of the crack 50, but also improve the structural stability of the protective device.

[0060] (4) By providing a plurality of telescopic frames 10, the extension direction of the crack 50 can be protected, thereby preventing the rock masses on both sides of the crack 50 from moving and deforming excessively, thereby playing a protective role.

[0061] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0062] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0063] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0064] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0065] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0066] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A protective device, characterized in that: The protective device comprises: A telescopic frame (10) comprises a first crossbeam (11), a second crossbeam (12) and a sliding member (13), wherein the sliding member (13) comprises a first longitudinal beam (131) and a second longitudinal beam (132), wherein the first crossbeam (11) and the second crossbeam (12) are fixedly connected to rock masses on both sides of the crack (50), respectively, one end of the first longitudinal beam (131) is fixedly connected to the first crossbeam (11), one end of the second longitudinal beam (132) is fixedly connected to the second crossbeam (12), and the other end of the first longitudinal beam (131) is slidably connected to the other end of the second longitudinal beam (132); a protective net (20) fixedly arranged on the telescopic frame (10) and shielding the interval between the first crossbeam (11) and the second crossbeam (12); The hydraulic component (30) comprises a hydraulic cylinder (31) and a telescopic rod (32) telescopically arranged on the hydraulic cylinder (31); the first crossbeam (11) and the second crossbeam (12) are connected via the hydraulic component (30).

2. The protective device according to claim 1, characterized in that The first longitudinal beam (131) is a concave longitudinal beam (1311), and the second longitudinal beam (132) is a convex longitudinal beam (1321). The convex longitudinal beam (1321) is embedded in the concave longitudinal beam (1311) and can slide relative to the concave longitudinal beam (1311). The convex longitudinal beam (1321) and the concave longitudinal beam (1311) are matched with each other in a direction perpendicular to their axial directions.

3. The protective device according to claim 1, characterized in that The telescopic frame (10) comprises two sliding members (13), wherein one sliding member (13) is arranged at the first end of the first crossbeam (11) and the second crossbeam (12), and the other sliding member (13) is arranged at the second end of the first crossbeam (11) and the second crossbeam (12).

4. The protection device according to any one of claims 1 to 3, characterized in that The protective device further comprises a plurality of columns (41), wherein the plurality of columns (41) are arranged one by one at a plurality of corners of the telescopic frame (10), the bottoms of the columns (41) are fixedly connected to the ground, the first longitudinal beam (131) is fixedly connected to the tops of the corresponding columns (41), and the second longitudinal beam (132) is fixedly connected to the tops of the corresponding columns (41).

5. The protective device according to claim 4, characterized in that: The protective device further comprises an anchor cable (42); the column (41) has a mounting hole extending therethrough; the anchor cable (42) is passed through the mounting hole.

6. The protective device according to claim 4, characterized in that The telescopic frame (10) further comprises a base, the base being fixedly arranged on the ground, the lower end of the upright column (41) being fixedly connected to the base, and the protective net (20) being located between the base and the telescopic frame (10).

7. The protection device according to any one of claims 1 to 3, characterized in that: The protective device comprises four hydraulic components (30), and each two hydraulic components (30) are respectively arranged on both sides of each corresponding sliding component (13).

8. The protection device according to any one of claims 1 to 3, characterized in that: The telescopic rod (32) comprises a first telescopic rod (321) and a second telescopic rod (322) respectively located on both sides of the hydraulic cylinder (31), wherein the first end of the first telescopic rod (321) is fixedly connected to the first crossbeam (11), the first end of the second telescopic rod (322) is fixedly connected to the second crossbeam (12), and the second end of the first telescopic rod (321) and the second end of the second telescopic rod (322) are respectively connected to the hydraulic cylinder (31).

9. The protection device according to any one of claims 1 to 3, characterized in that: The telescopic frame (10) is made of nickel steel; and / or, The protective net (20) comprises a steel wire mesh (21).

10. The protection device according to any one of claims 1 to 3, characterized in that: The protective device comprises a plurality of telescopic frames (10), and the plurality of telescopic frames (10) are arranged in sequence along the extension direction of the crack (50).

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