Blasting flying stone protection device

Abstract

The utility model relates to the technical field of flying stone protection devices, in particular to a blasting flying stone protection device which comprises bases which are oppositely arranged, T-shaped sliding grooves are oppositely formed in the bases, caulking grooves located between the T-shaped sliding grooves are oppositely formed in the bases, and mounting holes used for fixing the bases are formed in the two ends of the bases. T-shaped blocks capable of sliding along the T-shaped sliding grooves are arranged on the bases, vertical beams are arranged on the T-shaped blocks, inserting holes are formed in the upper ends of the vertical beams, cross beams capable of stretching into or stretching out of the inserting holes are arranged on the vertical beams located on the same base, connecting beams capable of being placed in or out of the caulking grooves are arranged on the bases, sliding blocks are arranged on the connecting beams, and limiting grooves corresponding to the sliding blocks are formed in the cross beams. A frame body capable of sliding in or sliding out along the sliding block and the limiting groove is arranged between the cross beam and the connecting beam, and a limiting assembly used for limiting the frame body is arranged on the vertical beam. And the frame body is limited through the limiting assembly, so that the overall assembly of the blasting flying stone protection device can be completed.

Description

Technical Field

[0001] This utility model relates to the technical field of flying rock protection devices, specifically, to a flying rock protection device for blasting. Background Technology

[0002] Blasting is a common and efficient excavation method used in tunnel construction, effectively breaking rocks and improving construction efficiency. However, blasting inevitably generates a large amount of flyrock, blast waves, and debris, whose high-speed projection and impact can easily threaten personnel safety and machinery. The safety hazards posed by flyrock are particularly serious when workers are densely packed together.

[0003] Existing rockfall protection devices generally include protective netting, protective frames, and matching fixing devices. The protective netting is mostly woven from high-strength steel wire, and its supporting frame structure is usually assembled from steel profiles through welding. However, because a large number of components need to be welded on-site, this not only places high demands on the welding skills of construction workers, but also results in long construction cycles, low efficiency, and the need for cutting equipment during dismantling of welded structures, which is highly destructive, difficult to reuse, and increases project costs. Therefore, improvements are needed. Summary of the Invention

[0004] The purpose of this invention is to provide a protective device against flying rocks from blasting, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A protective device for flying rocks from blasting includes a base arranged opposite each other, with T-shaped grooves opposite each other on the bases, and a groove located between the T-shaped grooves opposite each other on the bases. Mounting holes for fixing the bases are provided at both ends of the bases. T-shaped blocks that can slide along the T-shaped grooves are provided on the bases. Vertical beams are provided on the T-shaped blocks, with insertion holes at the upper ends of the vertical beams. Horizontal beams that can extend into or out of the insertion holes are provided on the vertical beams located on the same base. Connecting beams that can be inserted into or removed from the grooves are provided on the bases. Sliding blocks are provided on the connecting beams. Limiting grooves corresponding to the sliding blocks are provided on the horizontal beams. A frame that can slide in or out along the sliding blocks and limiting grooves is provided between the horizontal beams and the connecting beams. A protective net is provided in one side of the frame, and a detachable protective curtain is provided in the other side of the frame. Limiting components for limiting the movement of the frame are provided on the vertical beams.

[0007] Furthermore, the limiting component includes a connecting frame disposed on the vertical beam near the protective curtain, the connecting frame having a sliding groove, a limiting frame disposed on the vertical beam near the protective net, and a sliding limiting rod disposed between the sliding groove and the limiting frame.

[0008] Furthermore, the limiting frame is provided with a limiting hole, the limiting rod is provided with a locking hole corresponding to the limiting hole, the limiting frame is provided with a cylinder corresponding to the limiting hole, the cylinder is provided with a cavity with an open top, a plug is provided at the opening of the cavity, the bottom end of the cylinder is provided with a through hole communicating with the cavity, a bottom cap is provided at the through hole, a round rod with its bottom end extending through the bottom cap is provided in the cavity, a push ring is provided on the surface of the round rod located in the cavity, and a first spring is provided between the push ring and the plug for pushing the round rod into the locking hole.

[0009] Furthermore, the top of the round rod extends through the plug, and the end of the round rod extending through the plug is provided with a pull block. The inner wall of the round cavity is provided with a vertical groove, and a rotating slot connected to the vertical groove is provided above the vertical groove. The push ring is provided with a positioning rod that can slide between the vertical groove and the rotating slot.

[0010] Furthermore, the frame for installing the protective curtain has horizontal grooves at its four corners, and the upper and lower sides of the protective curtain have locking rods that can slide along the horizontal grooves. The locking rods have round holes at both ends, and the two sides of the frame have lifting rods whose tops can extend into or out of the round holes.

[0011] Furthermore, the frame for installing the protective curtain has blocks on both sides, and the blocks have cavities with openings at the top for installing lifting rods. The opening end of the cavity is provided with a cap, the top end of the lifting rod extends through the cap, and the bottom end of the lifting rod extends through the bottom wall of the cavity. The cavity is provided with a collar connected to the lifting rod, and a second spring is provided between the collar and the cap for pushing the lifting rod away from the round hole.

[0012] Furthermore, the upper and lower ends of the limiting rod are symmetrically provided with inclined blocks for pushing the lifting rod into the circular hole.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model can complete the assembly and fixation of the support frame by cooperating with T-shaped grooves, mounting holes, slots, T-shaped blocks, vertical beams, insertion holes, horizontal beams, connecting beams, sliders, limiting grooves, frames and limiting components. It solves the problems of long construction cycle and low efficiency caused by welding required to complete the assembly of the support frame, as well as the problems of difficulty in dismantling and reuse.

[0015] In this invention, when installing the protective curtain inside the frame, first insert both ends of one clamping rod into the horizontal groove on the upper side of the frame, and then insert both ends of another clamping rod into the horizontal groove on the lower side of the frame. After the clamping rods are inserted, a lifting rod extends into the round hole to limit the clamping rods and prevent them from detaching from the horizontal groove, thus completing the fixation of the protective curtain. When it is necessary to remove or replace the protective curtain, the lifting rod is disengaged from the round hole to release the limitation on the clamping rods, and the protective curtain can be removed, facilitating construction personnel to carry out the work. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a blasting fly rock protection device according to the present invention.

[0017] Figure 2 This is a schematic diagram of the base structure in this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of some components of this utility model after they are installed on the base.

[0019] Figure 4 This is a schematic diagram of the protective netting structure in this utility model.

[0020] Figure 5 This is a schematic diagram of the structure of the present invention where the protective curtain is not installed on the frame.

[0021] Figure 6 for Figure 3 Enlarged diagram of point A in the middle.

[0022] Figure 7 for Figure 5 Enlarged diagram of point B in the middle.

[0023] Figure 8 This is a schematic diagram of the internal components of the cylinder in this utility model.

[0024] Figure 9 This is an exploded structural diagram of the cylinder and its internal components in this utility model.

[0025] Figure 10 This is a schematic diagram of the internal components of the block in this utility model.

[0026] The labels in the diagram represent the following: 100, base; 101, T-slot; 102, groove; 103, mounting hole; 104, T-block; 105, vertical beam; 106, insertion hole; 107, horizontal beam; 108, connecting beam; 109, slider; 110, limiting groove; 111, frame; 112, guide groove; 113, protective net; 114, protective curtain; 200, connecting frame; 201, slot; 202, limiting frame; 203, limiting rod; 204, lock hole; 2 05. Cylindrical; 206. Plug; 207. Through hole; 208. Bottom cap; 209. Round rod; 210. Push ring; 211. First spring; 300. Pull block; 301. Vertical groove; 302. Rotary slot; 303. Positioning rod; 400. Horizontal groove; 401. Locking rod; 402. Round hole; 403. Lifting rod; 404. Block; 405. Sealing cap; 406. Collar; 407. Second spring; 408. Inclined block; 409. Positioning block; 410. Positioning groove. Detailed Implementation

[0027] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are merely illustrative of this utility model and are not intended to limit it.

[0028] The following is in conjunction with the appendix Figures 1-10 This embodiment will be described in further detail.

[0029] Please see Figures 1-10 A blasting debris protection device in this embodiment includes a base 100 disposed opposite to each other. T-shaped grooves 101 are disposed opposite to each other on the base 100. An insert 102 is disposed opposite to each other on the base 100 between the T-shaped grooves 101. Mounting holes 103 for fixing the base 100 are provided at both ends of the base 100. A T-shaped block 104 that can slide along the T-shaped grooves 101 is provided on the base 100. A vertical beam 105 is provided on the T-shaped block 104. A T-shaped slider 109 is fixedly connected to the vertical beam 105. An insertion hole 106 is provided at the upper end of the vertical beam 105. A horizontal beam that can extend into or out of the insertion hole 106 is provided on the vertical beam 105 located on the same base 100. 107. A crossbeam 107 is slidably connected between the insertion holes 106. A connecting beam 108 is provided on the base 100, which can be inserted into or removed from the groove 102. A slider 109 is provided on the connecting beam 108, and the slider 109 is fixedly connected to the connecting beam 108. A limiting groove 110 corresponding to the slider 109 is provided on the crossbeam 107. A frame 111 is provided between the crossbeam 107 and the connecting beam 108, which can slide in or out along the slider 109 and the limiting groove 110. A protective net 113 is provided in one side of the frame 111, and a detachable protective curtain 114 is provided in the other side of the frame 111. A limiting component is provided on the vertical beam 105 for limiting the frame 111.

[0030] In this embodiment, when assembling the blasting fly rock protection device, the base 100 is first placed on the ground at the tunnel entrance. Then, according to the length of the connecting beam 108, the distance between the bases 100 is adjusted so that the connecting beam 108 can be inserted into the groove 102. After the distance of the bases 100 is adjusted, holes are drilled in the ground. The mounting holes 103 on the base 100 are aligned with the drilled holes in the ground. The base 100 is fixed with expansion bolts. After the base 100 is fixed, the connecting beam 108 is placed in the groove 102. Then, the vertical beam 105 is installed on the base 100 by sliding the T-block 104 into the T-slot 101. After the horizontal beam 107 is inserted into the insertion hole 106, the above structure can form a support frame for installing the frame 111.

[0031] After the support frame is installed, the frame 111 can be installed. The bottom of the frame 111 has a guide groove 112 that slides along the slider 109. Through the cooperation of the guide groove 112 and the slider 109, the frame 111 can be moved to complete its installation between the slider 109 and the limiting groove 110, facilitating operation by construction personnel. In actual use, the frame 111 with a protective net 113 is installed on the side closer to the tunnel entrance, while the frame 111 with a protective curtain 114 is installed on the side farther from the tunnel entrance. After the frame 111 is installed, it is limited by the limiting components, thus completing the overall assembly of the blasting fly rock protection device. This installation method solves the problems of existing support frames requiring welding for assembly, resulting in long construction cycles, low efficiency, and difficulty in dismantling and reuse.

[0032] In this embodiment, the protective net 113 is made of steel wire and is fixedly connected to the frame 111. The connection between the protective net 113 and the frame 111 can be fixed by welding. The protective curtain 114 is made of flame-retardant canvas or polyester dustproof cloth. When blasting is carried out in the tunnel, the protective net 113 can initially block the flying rocks flying towards the tunnel entrance, and the protective curtain 114 can secondarily block the flying rocks or dust that cross the protective net 113, so that the protective effect of the blasting flying rock protection device is better.

[0033] In this embodiment, the width of the groove 102 is greater than the width of the connecting beam 108, and the width of the limiting groove 110 is greater than the width of the frame 111, so as to facilitate the installation of the frame 111; wherein, the inner walls of the groove 102 and the limiting groove 110 can be fitted with rubber shock-absorbing pads to buffer the frame 111 and buffer the impact of flying stones.

[0034] Please see Figures 1-10 In this embodiment, the limiting component includes a connecting frame 200 disposed on a vertical beam 105 near the protective curtain 114. The connecting frame 200 is fixedly connected to the vertical beam 105. A sliding groove 201 is provided in the connecting frame 200. A limiting frame 202 is disposed on the vertical beam 105 near the protective net 113. The limiting frame 202 is fixedly connected to the vertical beam 105. A slidable limiting rod 203 is provided between the sliding groove 201 and the limiting frame 202. The limiting rod 203 is slidably connected to the sliding groove 201.

[0035] In this embodiment, after the frame 111 is installed, the limiting rod 203 can be inserted between the slide groove 201 and the limiting frame 202. The limiting rod 203 limits the two sides of the frame 111 to prevent the frame 111 from sliding out of the support frame.

[0036] Please see Figures 1-10In this embodiment, the limiting frame 202 is provided with a limiting hole, the limiting rod 203 is provided with a locking hole 204 corresponding to the limiting hole, the limiting frame 202 is provided with a cylinder 205 corresponding to the limiting hole, the cylinder 205 is fixedly connected to the limiting frame 202, the cylinder 205 is provided with a cavity with an open top, a plug cap 206 is provided at the opening of the cavity, the plug cap 206 is threadedly connected to the cavity, the bottom end of the cylinder 205 is provided with a through hole 207 communicating with the cavity, a bottom cap 208 is provided at the through hole 207, the bottom cap 208 is threadedly connected to the through hole 207, the cavity is provided with a round rod 209 extending through the bottom cap 208, the surface of the round rod 209 located in the cavity is provided with a push ring 210, the push ring 210 is fixedly connected to the round rod 209, and a first spring 211 is provided between the push ring 210 and the plug cap 206 for pushing the round rod 209 into the locking hole 204.

[0037] In this embodiment, after the limiting rod 203 is inserted into the slide groove 201 and the limiting frame 202, the first spring 211 pushes the push ring 210 downward, which in turn drives the round rod 209 downward, so that the round rod 209 is inserted into the lock hole 204 to lock the limiting rod 203 and prevent the limiting rod 203 from sliding and affecting the limiting rod 203's limitation on the frame 111.

[0038] Please see Figures 1-10 In this embodiment, the top end of the round rod 209 extends through the plug 206, and the end of the round rod 209 extending through the plug 206 is provided with a pull block 300. The pull block 300 is fixedly connected to the round rod 209. The inner wall of the round cavity is provided with a vertical groove 301. Above the vertical groove 301, there is a rotating slot 302 that communicates with the vertical groove 301. The push ring 210 is provided with a positioning rod 303 that can slide between the vertical groove 301 and the rotating slot 302. The positioning rod 303 and the push ring 210 are fixedly connected.

[0039] In this embodiment, when the locking of the limiting rod 203 is released, the pull block 300 can be pulled to move the round rod 209 upward. The upward movement of the round rod 209 causes the push ring 210 to compress the first spring 211 and move upward. The upward movement of the push ring 210 causes the positioning rod 303 to move upward along the vertical groove 301. When the positioning rod 303 moves upward to the junction of the vertical groove 301 and the rotating slot 302, the pull block 300 can no longer be pulled upward. At this time, rotating the pull block 300 causes the round rod 209 to rotate. The rotation of the round rod 209 can cause the push ring 210 to rotate. The rotation of the push ring 210 can cause the positioning rod 303 to rotate into the rotating slot 302. At this time, the pull block 300 is released, and the round rod 209 can be completely disengaged from the lock hole 204, and the bottom end of the round rod 209 is located on the upper side of the limiting frame 202. When installing the limiting rod 203, the above steps can be followed to position the lower end of the round rod 209 above the limiting frame 202, so that the limiting rod 203 can be installed. By pulling and rotating the pull block 300, the limiting rod 203 can be locked and disassembled. The operation is simple and convenient for construction personnel.

[0040] In this embodiment, the plug cap 206 is threaded to the circular cavity, and the bottom cap 208 is threaded to the through hole 207, which facilitates the installation of components inside the circular cavity.

[0041] Please see Figures 1-10 In this embodiment, the frame 111 for installing the protective curtain 114 has horizontal grooves 400 at its four corners. The upper and lower sides of the protective curtain 114 are provided with locking rods 401 that can slide along the horizontal grooves 400. The upper and lower sides of the protective curtain 114 are fixedly connected to the corresponding locking rods 401. The two ends of the locking rods 401 are provided with round holes 402. The two sides of the frame 111 are provided with lifting rods 403 whose top ends can extend into or out of the round holes 402.

[0042] In this embodiment, when the protective curtain 114 is installed inside the frame 111, the two ends of one clamping rod 401 are first inserted into the horizontal groove 400 on the upper side of the frame 111, and the two ends of another clamping rod 401 are inserted into the horizontal groove 400 on the lower side of the frame 111. After the clamping rods 401 are inserted, the lifting rod 403 extends into the round hole 402 to limit the clamping rods 401 and prevent them from coming out of the horizontal groove 400, thus completing the fixation of the protective curtain 114. When it is necessary to remove or replace the protective curtain 114, the lifting rod 403 is disengaged from the round hole 402 to release the limitation on the clamping rods 401, and the protective curtain 114 can be removed, which is convenient for construction personnel to carry out construction.

[0043] In this embodiment, the locking rod 401 is provided with a positioning block 409, and the transverse groove 400 is provided with a positioning groove 410. The positioning block 409 is slidably connected to the positioning groove 410. When the locking rod 401 is inserted into the transverse groove 400, the positioning block 409 needs to be aligned with the positioning groove 410 and slid in, so that the round holes 402 at both ends of the locking rod 401 can be aligned with the ends of the lifting rod 403, so that the lifting rod 403 can easily extend into the round holes 402.

[0044] In this embodiment, when installing the protective curtain 114, the protective curtain 114 is first pre-installed on the frame 111, and then the frame 111 is pushed into the support frame before the protective curtain 114 is fixed in place.

[0045] Please see Figures 1-10 In this embodiment, the frame 111 for installing the protective curtain 114 has blocks 404 on both sides, and the blocks 404 are fixedly connected to the frame 111. The frame 111 and the blocks 404 have a cavity for installing the lifting rod 403 with an open top. The opening end of the cavity is provided with a cap 405, which is threadedly connected to the opening end of the cavity. The top end of the lifting rod 403 extends through the cap 405, and the bottom end of the lifting rod 403 extends through the bottom wall of the cavity. The cavity has a collar 406 connected to the lifting rod 403, and the collar 406 is fixedly connected to the lifting rod 403. A second spring 407 is provided between the collar 406 and the cap 405 for pushing the lifting rod 403 away from the round hole 402.

[0046] The upper and lower ends of the limiting rod 203 are symmetrically provided with inclined blocks 408 for pushing the corresponding lifting rod 403 into the circular hole 402. The inclined blocks 408 are fixedly connected to the limiting rod 203.

[0047] In this embodiment, after the protective curtain 114 is installed, when the frame 111 is limited by the limiting rod 203, the movement of the limiting rod 203 can drive the inclined block 408 to move. The side wall of the inclined block 408 is provided with a guide surface corresponding to the lifting rod 403. The movement of the inclined block 408 can drive the lifting rod 403 to slide along the guide surface, so that it moves into the round hole 402 to limit the locking rod 401. When the limiting rod 203 is pulled out from between the slide groove 201 and the limiting frame 202, the second spring 407 pushes the collar 406, and the collar 406 pushes the lifting rod 403, which can drive the lifting rod 403 to disengage from the round hole 402, releasing the limitation on the locking rod 401. After the limitation is released, the protective curtain 114 can be disassembled.

[0048] In this embodiment, when the second spring 407 pushes the lifting rod 403 to disengage from the circular hole 402, its end away from the circular hole 402 can be positioned flush with the lowest point of the guide surface of the inclined block 408, so that when the limiting rod 203 moves the inclined block 408, the guide surface of the inclined block 408 can contact the end of the lifting rod 403, thereby pushing the lifting rod 403 into the circular hole 402.

[0049] In this embodiment, the height of the connecting frame 200 is sufficient to allow the inclined block 408 to pass through the frame 111 without affecting the installation of the limiting rod 203.

[0050] In use, the base 100 is first placed on the ground at the tunnel entrance. Then, the distance between the bases 100 is adjusted according to the length of the connecting beam 108 so that the connecting beam 108 can be inserted into the groove 102. After the distance of the bases 100 is adjusted, holes are drilled in the ground. The mounting holes 103 on the bases 100 are aligned with the drilled holes in the ground, and the bases 100 are fixed with expansion bolts. After the bases 100 are fixed, the connecting beam 108 is placed in the groove 102. Next, the T-shaped block 104 is slid into the T-shaped groove 101, the vertical beam 105 is installed on the base 100, and the horizontal beam 107 is inserted into the corresponding insertion hole 106 to complete the installation of the support frame. Then, the protective curtain 114 is pre-installed on the frame 111, and the frame 111 with the protective net 113 and the pre-installed protective curtain 114 is pushed along the slider 109 and the guide groove 112 to slide into the support frame. The frame 111 is then limited by the limiting component.

[0051] In summary, the above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall fall within the scope of the patent of the present utility model.

Claims

1. A flying rock protection device for blasting, comprising oppositely arranged bases (100), characterized in that: The base (100) is oppositely provided with T-shaped sliding grooves (101), oppositely provided with embedding grooves (102) between the T-shaped sliding grooves (101), and oppositely provided with mounting holes (103) for fixing the base (100) at both ends of the base (100). The base (100) is provided with a T-shaped block (104) which can slide along the T-shaped sliding grooves (101). The T-shaped block (104) is provided with a vertical beam (105). The upper end of the vertical beam (105) is provided with a plug hole (106). The vertical beams (105) on the same base (100) are provided with a cross beam (107) which can extend into or out of the plug hole (106). The base (100) is provided with a connecting beam (108) which can be put into or out of the embedding groove (102). The connecting beam (108) is provided with a sliding block (109). The cross beam (107) is provided with a limiting groove (110) corresponding to the sliding block (109). The cross beam (107) and the connecting beam (108) are provided with a frame (111) which can slide into or out of the sliding block (109) and the limiting groove (110). The one side frame (111) is provided with a protective net (113). The other side frame (111) is provided with a detachable protective curtain (114). The vertical beam (105) is provided with a limiting assembly for limiting the frame (111).

2. A flyrock protection device according to claim 1, wherein: The limiting assembly comprises a connecting frame (200) provided on the vertical beam (105) near the protective curtain (114). The connecting frame (200) is provided with a sliding groove (201). The vertical beam (105) near the protective net (113) is provided with a limiting frame (202). The sliding groove (201) and the limiting frame (202) are provided with a limiting rod (203) which can slide.

3. A flyrock protection device according to claim 2, wherein: The limiting frame (202) is provided with a limiting hole. The limiting rod (203) is provided with a lock hole (204) corresponding to the limiting hole. The limiting frame (202) is provided with a cylinder (205) corresponding to the limiting hole. The cylinder (205) is provided with a circular cavity with an open top. The opening of the circular cavity is provided with a plug cap (206). The bottom end of the cylinder (205) is provided with a through hole (207) in communication with the circular cavity. The through hole (207) is provided with a bottom cap (208). The circular cavity is provided with a circular rod (209) extending out of the bottom cap (208). The surface of the circular rod (209) in the circular cavity is provided with a push ring (210). The push ring (210) and the plug cap (206) are provided with a first spring (211) for pushing the circular rod (209) into the lock hole (204).

4. A flyrock protection device according to claim 3, wherein: The top end of the circular rod (209) extends out of the plug cap (206). The end of the circular rod (209) extending out of the plug cap (206) is provided with a pull block (300). The inner wall of the circular cavity is provided with a vertical groove (301). The upper end of the vertical groove (301) is provided with a rotating clamping groove (302) in communication with the vertical groove (301). The push ring (210) is provided with a positioning rod (303) which can slide between the vertical groove (301) and the rotating clamping groove (302).

5. A flying rock protection device according to claim 1, wherein: The frame (111) for installing the protective curtain (114) is provided with transverse grooves (400) at four corners, the upper and lower sides of the protective curtain (114) are provided with clamping rods (401) capable of sliding along the transverse grooves (400), the two ends of the clamping rods (401) are provided with round holes (402), and the two sides of the frame (111) are provided with lifting rods (403) capable of extending into or out of the round holes (402).

6. A flyrock protection device according to claim 5, wherein: The frame (111) for installing the protective curtain (114) is provided with blocks (404) at the two sides, the blocks (404) are provided with cavities for installing the lifting rods (403) and being open at the upper end, the open end of the cavity is provided with a sealing cap (405), the top end of the lifting rod (403) extends out through the sealing cap (405), the bottom end of the lifting rod (403) extends out through the bottom wall of the cavity, the cavity is provided with a sleeve ring (406) connected with the lifting rod (403), and the sleeve ring (406) and the sealing cap (405) are provided with a second spring (407) for pushing the lifting rod (403) out of the round hole (402).

7. A flying rock protection device according to claim 5, wherein: The upper and lower end faces of the limiting rod (203) are symmetrically provided with inclined blocks (408) for pushing the lifting rod (403) into the round hole (402).

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