A rockfall protection net device for mining faces

Abstract

This utility model relates to the field of ore mining protection technology and discloses a rockfall protection net device for mining faces. It includes a fixing nail, which is fixedly installed on the ground. A first half-ring and a second half-ring are engaged on the upper outer surface of the fixing nail. The first and second half-rings are rotatably connected, and each half-ring has a limiting block fixedly installed at one end. This rockfall protection net device for mining faces, fixed to the ground with fixing nails and with the first and second half-rings rotatably connected and engaged by limiting blocks and limiting levers, facilitates quick installation and disassembly of the protective net's fixing structure. When replacing the net, it eliminates the need for gas cutting equipment as required by traditional welded protective nets, and also eliminates the need to remove numerous bolts. Simply pulling out the limiting levers separates the first and second half-rings, significantly simplifying the operation process, shortening replacement time, and improving maintenance efficiency.

Description

Technical Field

[0001] This utility model relates to the field of ore mining protection technology, specifically a rock fall protection net device for mining faces. Background Technology

[0002] In the field of mining engineering, underground and open-pit mining faces are prone to rock spalling and falling accidents due to factors such as rock stress release, blasting vibration, and rock weathering. Such accidents not only damage core mining equipment such as tunneling machines and scraper conveyors, leading to production interruptions, but also pose a direct threat to the lives of workers. Therefore, setting up rock fall protection nets in high-risk areas such as the top and side walls of the working face has become one of the core technical means to ensure the safety of mining operations. Currently, the rock fall protection nets used in mining faces are key protective equipment, and their protective reliability and ease of maintenance are directly related to the continuous operation of mining operations and the effectiveness of safety management. In existing technologies, rockfall protection nets generally adopt a combined structural design of "support frame + protection net body". The connection methods between the protection net body and the support frame are mainly divided into three categories: welding fixation, rigid connection with multiple bolts, and simple buckle connection. In order to pursue structural stability, some protection nets even weld the net body and the frame directly into an integrated structure. Although some protection nets adopt a detachable connection form, the connection structure design lacks specificity. For example, they are fixed by using multiple bolts through the edge of the net body and the ear plate of the frame, or they use a clamp connection structure without adjustment function, which can only meet the installation requirements of a single size net body. However, the existing protective nets mentioned above all have prominent problems in actual mining applications, such as inconvenience in replacing the nets. For welded protective nets, when the net is damaged or cracked due to rock impact, gas cutting equipment is needed to cut the weld seam to remove the old net. After replacing the net, it is necessary to re-weld and fix it. Not only is the operation process cumbersome, but repeated welding can also lead to local stress concentration in the support frame, reducing the overall structural strength of the frame. For bolted protective nets, in order to ensure connection stability, a single net usually needs to be equipped with multiple sets of fixing bolts. However, the dust concentration and humidity at the mining operation surface are high, and the bolts are easily affected by slag adhesion and corrosion. During disassembly, repeated hammering and application of lubricant are required. Some severely corroded bolts even need to be destructively removed, which greatly increases the time and difficulty of replacing the protective net. The connection length between the existing protective netting and the supporting frame is mostly fixed and lacks an adjustable structure. When the netting is actually installed or replaced at the mining face, if there are slight protrusions or depressions in the rock strata of the working face, or if the new netting has dimensional deviations due to production and processing errors, the fixed-length connection structure cannot be adapted and adjusted. The edges of the netting need to be cut again or the frame needs to be reprocessed, which not only increases material consumption and replacement costs, but also causes the working face to be exposed to the risk of rock falling for a long time. In summary, existing rockfall protection nets at mining faces suffer from problems such as unreasonable connection structure design, lack of adjustability, and cumbersome disassembly procedures, resulting in difficult and inefficient net replacement operations and significant safety risks during the replacement process. These issues fail to meet the high-efficiency and safe protection requirements of mining sites. Therefore, developing a rockfall protection net device that simplifies the replacement process and improves replacement efficiency has become an urgent technical problem to be solved in the field of mining safety equipment. Utility Model Content

[0003] The purpose of this utility model is to provide a rock fall protection net device for mining operations, so as to solve the problems of cumbersome net replacement process and low replacement efficiency mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a rock fall protection net device for mining faces, comprising a fixing nail, the fixing nail being fixedly set on the ground, and a first half-ring and a second half-ring being engaged and installed on the upper outer surface of the fixing nail, the first half-ring and the second half-ring being rotatably connected, and a limit block being fixedly set at one end of both the first half-ring and the second half-ring, and both limit blocks being penetrated by a limit rod, a connecting cylinder being fixedly set on the outer surface of the first half-ring, and a connecting rod being threadedly connected to one end of the connecting cylinder, and a mesh belt being fixedly set at one end of the connecting rod; The outer surface of the connecting rod is provided with a positioning hole, and the outer surface of the connecting cylinder is equipped with a sliding positioning rod; A piston cylinder is fixedly installed on the outer surface of the first semi-ring, and a connecting pipe is connected between one end of the piston cylinder and one end of the connecting cylinder. A sliding piston plate is installed inside the connecting cylinder, and a sliding anti-detachment block is installed at one end of the piston cylinder. An anti-detachment groove is opened on the middle section side surface of the limiting rod.

[0005] Preferably, the positioning holes are provided in multiple groups, with the positioning holes in the same group arranged at equal angles, and the positioning holes in different groups arranged at equal intervals.

[0006] By adopting the above technical solution, the installation angle and length of the connecting rod can be flexibly adjusted through multiple sets of positioning holes. The equal angle setting in the same group can adapt to the installation requirements of different directions, while the equal spacing setting in different groups makes it easy to adjust the connection length according to the actual working surface contour. This effectively solves the problem of poor adaptability of existing protective net connection dimensions, eliminates the need for secondary processing of the net body or frame, and reduces material consumption and replacement costs.

[0007] Preferably, one end of the positioning rod is engaged with the positioning hole, and a spring connects the positioning rod and the connecting cylinder.

[0008] Using the above technical solution, the positioning rod can automatically engage with the positioning hole under the action of the spring. When the positioning rod is pulled, it can overcome the spring force and disengage from the positioning hole, realizing the quick disassembly and fixation of the connecting rod. This structure avoids the problem of easy loosening in traditional bolt connections and prevents the connecting rod from loosening during use.

[0009] Preferably, the piston plate and the connecting cylinder are connected by sliding friction, and a spring is connected between the piston plate and the connecting cylinder.

[0010] Using the above technical solution, the piston plate slides in the connecting cylinder and the pressure is transmitted to the piston cylinder through the connecting pipe. When the connecting rod is threadedly connected to the connecting cylinder, the piston plate moves under pressure, causing the anti-detachment block to be stuck into the anti-detachment groove, which temporarily fixes the limit rod. When the connecting rod is disassembled, the piston plate is reset under the action of the spring, and the anti-detachment block is released from the limit. This design uses fluid pressure and spring to prevent the limit rod from accidentally falling off when replacing the guard net, ensuring work safety. The spring reset function makes the operation process simple and reliable.

[0011] Preferably, the anti-detachment block and the piston cylinder are connected by sliding friction, and one end of the anti-detachment block is engaged with the limiting rod through an anti-detachment groove.

[0012] Using the above technical solution, the sliding friction connection between the anti-detachment block and the piston cylinder, combined with the anti-detachment groove, can accurately engage or disengage from the limit lever when the pressure inside the piston cylinder changes.

[0013] Compared with the prior art, the beneficial effects of this utility model are: the rock fall protection net device for mining faces: 1. The protective netting is fixed to the ground with fixing nails. The first and second half rings are rotatably connected and engaged by limiting blocks and limiting rods. This design facilitates the quick installation and disassembly of the protective netting's fixing structure. When replacing the netting, there is no need to use gas cutting equipment like traditional welded protective netting, nor is it necessary to remove a large number of bolts. Simply pull out the limiting rods to separate the first and second half rings, which significantly simplifies the operation process, shortens the replacement time, and improves maintenance efficiency. 2. Before the limit lever is pulled out when replacing the protective net, the piston plate slides inside the connecting cylinder, and the pressure is transmitted to the piston cylinder through the connecting pipe, so that the anti-detachment block is locked into the anti-detachment groove, which temporarily fixes the limit lever and prevents it from falling off accidentally, causing the protective net to lose its fixation. This ensures the safety of the workers during the disassembly process. In addition, the piston plate and the connecting cylinder, as well as the anti-detachment block and the piston cylinder, are all connected by sliding friction and are equipped with springs. When the limit lever is reinstalled after replacement, the springs can automatically reset. The operation is simple and safe and reliable, avoiding the safety hazard of the working surface being unprotected when replacing the existing protective net. 3. When the mesh belt needs to be replaced, simply press the positioning rod to disengage it from the positioning hole and rotate the connecting rod to quickly disassemble the connection between the connecting rod and the connecting cylinder. Compared with traditional bolt connections, this avoids the possibility of bolts loosening during use. At the same time, multiple sets of positioning holes allow for flexible adjustment of the mesh belt installation angle and length, effectively solving the problem of poor compatibility of existing protective net connection dimensions. No secondary processing of the net body or frame is required, reducing material waste and replacement costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the connection between the fixing nail, the first half-ring, and the second half-ring of this utility model; Figure 3 This is a three-dimensional structural diagram of the connection between the second half-ring, the limiting block, and the limiting rod of this utility model; Figure 4 This is a three-dimensional structural diagram of the piston cylinder, connecting pipe, and anti-detachment block of this utility model; Figure 5 This is a three-dimensional structural diagram of the piston cylinder, connecting pipe, and anti-detachment block of this utility model, showing a cross-sectional view. Figure 6 This is a three-dimensional structural diagram of the first half-ring, the second half-ring, and the limiting block of this utility model in their working state.

[0015] In the diagram: 1. Fixing nail; 2. First half ring; 3. Second half ring; 4. Limiting block; 5. Limiting rod; 6. Connecting cylinder; 7. Connecting rod; 8. Mesh belt; 9. Positioning hole; 10. Positioning rod; 11. Piston cylinder; 12. Connecting pipe; 13. Piston plate; 14. Anti-detachment block; 15. Anti-detachment groove. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1-6 This utility model provides a technical solution: a rock fall protection net device for mining operations.

[0018] Example 1: This example discloses: a fixing nail 1, which is fixedly set on the ground, and a first half ring 2 and a second half ring 3 are engaged on the upper outer surface of the fixing nail 1. The first half ring 2 and the second half ring 3 are rotatably connected, and a limit block 4 is fixedly set at one end of the first half ring 2 and the second half ring 3. Both limit blocks 4 are penetrated by limit rods 5. A connecting cylinder 6 is fixedly set on the outer surface of the first half ring 2, and a connecting rod 7 is threadedly connected to one end of the connecting cylinder 6. A mesh belt 8 is fixedly set at one end of the connecting rod 7. The outer surface of the connecting rod 7 is provided with a positioning hole 9, and the outer surface of the connecting cylinder 6 is provided with a sliding positioning rod 10; The positioning holes 9 are provided in multiple groups, and the positioning holes 9 in the same group are set at equal angles, while the positioning holes 9 in different groups are set at equal intervals. One end of the positioning rod 10 is engaged with the positioning hole 9, and a spring connects the positioning rod 10 and the connecting cylinder 6. When installing protective netting at the mining face, firstly, drive the fixing nail 1 firmly into the ground as the basic fixing point for the entire protective netting device. Then, snap the first half ring 2 and the second half ring 3 onto the upper outer surface of the fixing nail 1. Since the first half ring 2 and the second half ring 3 are rotatably connected, their positions can be flexibly adjusted. After adjustment, insert the limiting rod 5 through the two limiting blocks 4 to achieve a stable connection between the first half ring 2 and the second half ring 3, thereby completing the initial fixing of the protective netting to the ground. Next, install the mesh belt 8. Thread the threaded end of the connecting rod 7 to the connecting cylinder 6. During the connection process, the installation angle and length of the mesh belt 8 can be adjusted according to actual needs using multiple sets of positioning holes 9 on the outer surface of the connecting rod 7 and the sliding positioning rod 10 on the outer surface of the connecting cylinder 6. The positioning holes 9, with equal angles in the same group and equal spacing in different groups, provide a variety of adjustment options. During adjustment, pull the positioning rod 10 to overcome the spring force between it and the connecting cylinder 6, disengaging it from the currently engaged positioning hole 9. Rotate or move the connecting rod 7 until it is engaged. Loosen the positioning rod 10 at the appropriate position. Under the action of the spring force, the positioning rod 10 will engage with the new positioning hole 9, achieving precise adjustment and fixation of the installation angle and length of the mesh belt 8. In daily use, if the mesh belt 8 is damaged due to rockfall impact or other reasons and needs to be replaced, simply press the positioning rod 10 again to disengage it from the positioning hole 9, and then unscrew the threaded connection between the connecting rod 7 and the connecting cylinder 6 to quickly disassemble the damaged mesh belt 8. Repeat the above steps when installing a new mesh belt 8. Compared with the traditional bolt-connected protective net, this significantly shortens the replacement time and improves maintenance efficiency.

[0019] Example 2: This example is based on Example 1: A piston cylinder 11 is fixedly provided on the outer surface of the first half ring 2, and a connecting pipe 12 is connected between one end of the piston cylinder 11 and one end of the connecting cylinder 6. A sliding piston plate 13 is installed inside the connecting cylinder 6, and a sliding anti-detachment block 14 is installed at one end of the piston cylinder 11. An anti-detachment groove 15 is opened on the middle section side surface of the limiting rod 5. The piston plate 13 and the connecting cylinder 6 are connected by sliding friction, and a spring is connected between the piston plate 13 and the connecting cylinder 6; The anti-detachment block 14 and the piston cylinder 11 are connected by sliding friction, and one end of the anti-detachment block 14 is engaged with the limit rod 5 through the anti-detachment groove 15; In the non-working state, the piston plate 13 is in the initial position inside the connecting cylinder 6 under the action of the spring force. At this time, the pressure in the space connected to the piston cylinder 11 through the connecting pipe 12 is balanced, and one end of the anti-disengagement block 14 retracts into the piston cylinder 11 and does not engage with the anti-disengagement groove 15 on the limit rod 5. After the replacement is completed, the new mesh belt 8 is installed in place. At this time, the end of the connecting rod 7 located inside the connecting cylinder 6 presses the piston plate 13. The piston plate 13 slides under pressure and changes the pressure inside the piston cylinder 11 through the connecting pipe 12. The anti-detachment block 14 slides under the pressure change and engages with the anti-detachment groove 15. At this time, the limiting rod 5 can be limited, so that the first half ring 2 and the second half ring 3 are firmly connected, and the replacement operation of the protective net is completed. The whole process is simple to operate and safe and reliable.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rock falling protection net device for mining operation face, comprising a fixing nail (1) fixedly arranged on the ground, and a first half ring (2) and a second half ring (3) clamped and installed on the outer surface of the upper end of the fixing nail (1), characterized in that: The first half ring (2) and the second half ring (3) are rotatably connected, and a limit block (4) is fixedly provided at one end of the first half ring (2) and the second half ring (3), and the two limit blocks (4) are both penetrated by the limit rod (5). A connecting cylinder (6) is fixedly provided on the outer surface of the first half ring (2), and a connecting rod (7) is threadedly connected to one end of the connecting cylinder (6), and a mesh belt (8) is fixedly provided at one end of the connecting rod (7).

2. A rockfall protection screen device for a mining workface according to claim 1, characterised in that: The outer surface of the connecting rod (7) is provided with a positioning hole (9), and the outer surface of the connecting cylinder (6) is provided with a sliding positioning rod (10).

3. A rockfall protection screen device for a mining work face according to claim 1, characterised in that: A piston cylinder (11) is fixedly provided on the outer surface of the first half ring (2), and a connecting pipe (12) is connected between one end of the piston cylinder (11) and one end of the connecting cylinder (6). A sliding piston plate (13) is installed inside the connecting cylinder (6), and a sliding anti-detachment block (14) is installed at one end of the piston cylinder (11). An anti-detachment groove (15) is opened on the middle side surface of the limiting rod (5).

4. The rockfall protection net device for mining faces according to claim 2, characterized in that: The positioning holes (9) are provided in multiple sets, and the positioning holes (9) in the same set are set at equal angles, and the positioning holes (9) in different sets are set at equal intervals.

5. A rockfall protection screen device for a mining workface according to claim 2, characterised in that: One end of the positioning rod (10) is engaged with the positioning hole (9), and a spring is connected between the positioning rod (10) and the connecting cylinder (6).

6. A rockfall protection screen device for a mining workface according to claim 3, characterised in that: The piston plate (13) and the connecting cylinder (6) are connected by sliding friction, and a spring is connected between the piston plate (13) and the connecting cylinder (6).

7. A rockfall protection screen device for a mining workface according to claim 3, characterised in that: The anti-detachment block (14) and the piston cylinder (11) are connected by sliding friction, and one end of the anti-detachment block (14) is engaged with the limiting rod (5) through the anti-detachment groove (15).

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