Flexible protective screen laying device

Abstract

The application discloses a flexible protective net laying device and relates to the technical field of tunnel face supporting, which comprises a net laying device, a glue coating device and a conveying device for conveying the flexible protective net to the net laying device, the rolling surface of the net laying device is matched with the shape of the surface to be laid, the glue coating device comprises a pressure-sensitive adhesive pumping mechanism and a pressure-sensitive adhesive nozzle, the pressure-sensitive adhesive pumping mechanism is communicated with the pressure-sensitive adhesive nozzle, the pressure-sensitive adhesive nozzle is located on the conveying path of the flexible protective net, and the pressure-sensitive adhesive nozzle is arranged correspondingly to the contact surface of the flexible protective net and the surface to be laid; in the process that the flexible protective net moves from the conveying device to the net laying device, the pressure-sensitive adhesive pumping mechanism sprays the pressure-sensitive adhesive on the contact surface of the flexible protective net and the surface to be laid through the pressure-sensitive adhesive nozzle, so that the pressure-sensitive adhesive on the flexible protective net can improve the connecting strength between the flexible protective net and the surface to be laid when the flexible protective net is laid by rolling the net laying device, and the laying effect of the flexible protective net is improved.

Description

Technical Field

[0001] This invention relates to the field of tunnel face support technology, and in particular to a flexible protective net laying device. Background Technology

[0002] Rockburst disasters affect construction progress and threaten the lives of construction workers, becoming one of the world's major challenges in the field of underground engineering. In order to prevent and control rockburst geological disasters, some scholars have considered applying flexible protective nets (geosynthetic materials, which are two-dimensional grid-like screens made of high molecular polymers such as polypropylene and polyvinyl chloride through thermoplastic or molding processes; they are a high-toughness material and therefore have a certain degree of flexibility, and their surface morphology can be changed by external forces) to tunnel support, forming a flexible support system with shotcrete layers and anchor bolts to absorb the impact energy of rockbursts and ensure the safety of personnel and equipment inside the tunnel.

[0003] The flexible mesh support system involves spraying concrete as initial support after tunnel excavation, then drilling anchor bolt holes in the tunnel body. After the flexible mesh is laid, anchor bolts are inserted into the pre-drilled holes. Gaskets and bolts are then applied to the exposed ends of the anchor bolts to prevent the flexible mesh from falling off. After the operation is completed, sprayed concrete is sprayed again to form an anchor bolt-flexible mesh-shot concrete support system, achieving the effect of rockburst prevention using the flexible mesh.

[0004] To facilitate the laying of flexible protective netting and save labor, specialized netting laying equipment is required, such as the "interlocking netting support equipment based on active support technology for ultra-large cross-section tunnels" disclosed in CN116044465A. The equipment mainly consists of a support column, a base platform, and a netting laying device. The netting laying device is fixed at the center of the base platform and consists of side plates, anchor net rolls, hydraulic columns, and a netting laying frame. The hydraulic columns are used to push the netting laying frame against the inner wall of the tunnel. The netting laying frame mainly includes a frame body, crossbeams, push rods, and roller structures. Several push rods with rollers on the crossbeams are used for automatic laying of the anchor netting. The principle is as follows: when laying the anchor netting, the hydraulic columns push the netting laying frame against the inner wall of the tunnel. Through their own rotation, the netting laying frame moves along the inner wall of the tunnel. The anchor netting is rolled onto the netting roll and then passes between two rollers. The lower roller pulls the anchor netting to make it rotate passively. The push rods are used to make the already installed anchor rods pass through the holes of the anchor netting, thereby realizing the automated laying of the anchor netting.

[0005] However, during the laying of flexible protective netting, the netting may sag under its own weight, or the unevenness of construction at different locations on the same netting may result in poor adhesion to the initial shotcrete layer. This will cause the subsequent shotcrete to fall off during the application of the second shotcrete, which is detrimental to the overall function of the support system. Whether using a roller-type jacking method or adding a jacking device to press the flexible netting against the tunnel wall, this method can only ensure a tighter fit between the flexible netting and the initial shotcrete layer when jacking is applied. Because there is a time interval between the laying of the flexible netting and the next process, once the jacking device is removed, the flexible netting will return to its uneven shape.

[0006] Therefore, there is an urgent need for a flexible protective net laying device with good laying effect. Summary of the Invention

[0007] The purpose of this invention is to provide a flexible protective net laying device to solve the problems existing in the prior art. After spraying pressure-sensitive adhesive onto the flexible protective net using an adhesive coating device, the flexible protective net is then laid on the surface to be laid, achieving good adhesion between the flexible protective net and the surface to be laid, and improving the laying effect.

[0008] To achieve the above objectives, the present invention provides the following solution: The present invention provides a flexible protective net laying device, including a net laying device for rolling and laying a flexible protective net, an adhesive application device, and a conveying device for conveying the flexible protective net to the net laying device. The rolling surface of the net laying device matches the shape of the surface to be laid. The adhesive application device includes a pressure-sensitive adhesive pumping mechanism and a pressure-sensitive adhesive nozzle. The pressure-sensitive adhesive pumping mechanism is connected to the pressure-sensitive adhesive nozzle. The pressure-sensitive adhesive nozzle is located on the conveying path of the flexible protective net and is arranged corresponding to the contact surface between the flexible protective net and the surface to be laid.

[0009] Preferably, the adhesive coating equipment further includes a mesh gluing box, the inner cavity of which is connected to the pressure-sensitive adhesive pumping mechanism. The bottom of the mesh gluing box is provided with a through-hole that matches the flexible protective net. A plurality of pressure-sensitive adhesive nozzles are evenly arranged at the position corresponding to the outlet of the through-hole in the mesh gluing box. The plurality of pressure-sensitive adhesive nozzles are arranged sequentially along the width direction of the flexible protective net, and the pressure-sensitive adhesive nozzles are connected to the inner cavity of the mesh gluing box.

[0010] Preferably, the net laying equipment includes a crossbeam and several sets of rollers arranged horizontally on the crossbeam. Each roller set includes a connector and pressing rollers. The connector is perpendicular to the crossbeam and is fixedly mounted on the crossbeam. Several pressing rollers are rotatably mounted on the top surface of the connector.

[0011] Preferably, the pressing roller has a rotating shaft rotatably mounted in the middle, and the two ends of the rotating shaft are respectively connected to the telescopic ends of the hydraulic telescopic rod, and the fixed end of the hydraulic telescopic rod is fixedly connected to the connecting member.

[0012] Preferably, the end of the rotating shaft is hinged to the telescopic end of the hydraulic telescopic rod.

[0013] Preferably, both ends of the connector are rotatably equipped with buffer rollers to protect the pressure rollers.

[0014] Preferably, the flexible protective netting laying device further includes a connecting post, the crossbeam is disposed at the top of the connecting post, and the adhesive application equipment and the conveying equipment are both disposed in the middle of the connecting post.

[0015] Preferably, a reinforcing rib is provided between the crossbeam and the connecting column.

[0016] Preferably, the conveying device includes a storage cylinder containing a rolled-up flexible protective net, and the storage cylinder has an output port for the flexible protective net to be output.

[0017] Preferably, the storage cylinder is detachably provided with a rotating shaft in the middle, and the storage cylinder has a mesh roll inlet for the rolled flexible protective net to enter, with the rolled flexible protective net rotatably mounted on the rotating shaft.

[0018] The present invention achieves the following main technical effects compared to the prior art:

[0019] During the process of the flexible protective net moving from the conveying equipment to the net laying equipment, the pressure-sensitive adhesive pumping mechanism sprays pressure-sensitive adhesive through the pressure-sensitive adhesive nozzle onto the contact surface between the flexible protective net and the surface to be laid. In this way, when the flexible protective net is rolled and laid using the net laying equipment, the pressure-sensitive adhesive on the flexible protective net will increase the connection strength between the flexible protective net and the surface to be laid, thereby improving the laying effect of the flexible protective net.

[0020] Other solutions of the present invention achieve the following technical effects compared with the prior art:

[0021] The hydraulic telescopic rods enable the pressing rollers of the overall net laying equipment to adapt to the shape of the surface to be laid. When there are protrusions or depressions, they can be retracted or extended outward under pressure. This not only improves the applicability of the device, but also ensures that the flexible protective netting fits tightly to the surface to be laid, further improving the laying effect.

[0022] When there are excessively rough and large protrusions on the tunnel surface, the buffer rollers replace the mesh pressing rollers and contact the protrusions first, thus protecting the mesh pressing rollers. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an isometric view of the flexible protective net laying device of the present invention;

[0025] Figure 2 This is a front view of the flexible protective net laying device of the present invention;

[0026] Figure 3 This is a left view of the flexible protective net laying device of the present invention;

[0027] Figure 4 This is a schematic diagram showing the state of the mesh laying device of the present invention when it is in actual contact with the arc-shaped mesh to be laid;

[0028] Figure 5 This is an exploded view of the net-laying equipment of the present invention;

[0029] Figure 6 This is a schematic diagram of the mesh gluing box of the present invention;

[0030] The components include: 1. Net laying equipment; 2. Adhesive coating equipment; 3. Conveying equipment; 4. Pressure-sensitive adhesive pumping mechanism; 5. Pressure-sensitive adhesive nozzle; 6. Net sheet adhesive feeding box; 7. Through-hole; 8. Crossbeam; 9. Roller assembly; 10. Connecting parts; 11. Net pressing roller; 12. Tank; 13. Insert block; 14. Hydraulic telescopic rod; 15. Buffer roller; 16. Connecting column; 17. Reinforcing rib; 18. Net storage cylinder; 19. Output port; 20. Rotating shaft. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] The purpose of this invention is to provide a flexible protective net laying device to solve the problems existing in the prior art. After spraying pressure-sensitive adhesive onto the flexible protective net using an adhesive coating device, the flexible protective net is then laid on the surface to be laid, achieving good adhesion between the flexible protective net and the surface to be laid, and improving the laying effect.

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Please refer to the following: Figures 1-6 As shown, a flexible protective netting laying device is provided, including a netting laying device 1 for rolling and laying the flexible protective netting, an adhesive application device 2, and a conveying device 3 for conveying the flexible protective netting to the netting laying device 1. The rolling surface of the netting laying device 1 matches the shape of the surface to be laid. The adhesive application device 2 includes a pressure-sensitive adhesive pumping mechanism 4 and a pressure-sensitive adhesive nozzle 5. The pressure-sensitive adhesive pumping mechanism 4 mainly includes a glue cylinder containing emulsion-type pressure-sensitive adhesive and a delivery pump. The delivery pump pumps the adhesive out of the glue cylinder. The pressure-sensitive adhesive pumping mechanism 4 is connected to the pressure-sensitive adhesive nozzle 5, which is located on the conveying path of the flexible protective netting. The flexible protective net has two sides, one for contact with the surface to be laid and the other for contact with the rolling surface of the net laying equipment 1. Pressure-sensitive adhesive nozzles 5 are set corresponding to the contact surfaces between the flexible protective net and the surface to be laid. During the process of the flexible protective net moving from the conveying equipment 3 to the net laying equipment 1, the pressure-sensitive adhesive pumping mechanism 4 sprays pressure-sensitive adhesive through the pressure-sensitive adhesive nozzles 5 onto the contact surfaces between the flexible protective net and the surface to be laid. In this way, when the flexible protective net is rolled and laid using the net laying equipment 1, the pressure-sensitive adhesive on the flexible protective net will increase the connection strength between the flexible protective net and the surface to be laid, thereby improving the laying effect of the flexible protective net.

[0035] The adhesive coating equipment 2 also includes a mesh adhesive feeding box 6. The inner cavity of the mesh adhesive feeding box 6 is connected to the pressure-sensitive adhesive pumping mechanism 4 through a conveying pipe. A through-hole 7 is provided at the bottom of the mesh adhesive feeding box 6. The through-hole 7 is matched with the flexible protective net, that is, the width and thickness of the through-hole 7 match the width and thickness of the flexible protective net. In this way, the through-hole 7 can be used to flatten the conveyed flexible protective net, thereby improving the uniformity of subsequent pressure-sensitive adhesive spraying. The specific setting method of the through-hole 7 can be: connecting the plate shape at the bottom of the mesh adhesive feeding box 6 by welding or bolting. The structure has a through-hole 7 formed by opening holes in the plate-shaped structure. The through-hole 7 can also be set up by thickening the bottom wall of the mesh glue box 6 and directly opening the through-hole 7 on the bottom wall of the mesh glue box 6. Several pressure-sensitive adhesive nozzles 5 are evenly arranged at the position corresponding to the outlet of the through-hole 7 in the mesh glue box 6. The several pressure-sensitive adhesive nozzles 5 are arranged sequentially along the width direction of the flexible protective net. The spray range of several pressure-sensitive adhesive nozzles 5 can be set to cover the flexible protective net, thereby improving the spraying effect of the pressure-sensitive adhesive. The pressure-sensitive adhesive nozzles 5 are connected to the inner cavity of the mesh glue box 6.

[0036] To further improve the spraying effect of pressure-sensitive adhesive, the surface of the mesh glue box 6 corresponding to the outlet end of the through-hole 7 is set as an inclined surface, and a pressure-sensitive adhesive nozzle 5 is set on the inclined surface, with the pressure-sensitive adhesive nozzle 5 facing the flexible protective mesh along with the inclined surface.

[0037] Control the power of the delivery pump to prevent the pressure-sensitive adhesive from being sprayed onto the netting equipment 1.

[0038] The net laying equipment 1 includes a crossbeam 8 and several sets of rollers 9 arranged horizontally on the crossbeam 8. The roller sets 9 include connectors 10 and pressing rollers 11. The connectors 10 are perpendicular to the crossbeam 8 and are fixedly mounted on the crossbeam 8. The fixing method can be bolt fixing or a groove 12 is opened on the crossbeam 8 at the position corresponding to the connectors 10. The bottom of the connectors 10 is provided with a plug block 13 that matches the groove 12. The plug block 13 is inserted into the groove 12. Then, along the length of the crossbeam 8, several connectors 10 are connected to the crossbeam 8 simultaneously using a bolt. Several pressing rollers 11 are rotatably mounted on the top surface of the connectors 10.

[0039] The pressing roller 11 has a rotating shaft in the middle, and the two ends of the rotating shaft are respectively connected to the telescopic ends of the hydraulic telescopic rod 14. The fixed end of the hydraulic telescopic rod 14 is fixedly connected to the connector 10. A certain pressure is set inside the hydraulic telescopic rod 14 to ensure that it pushes the pressing roller 11 tightly against the surface to be laid. Moreover, when encountering a protrusion, the pressing roller 11 is subjected to increased pressure, which will push the telescopic rod to retract. When encountering a depression, the pressing roller 11 is subjected to reduced pressure, and the telescopic rod continues to push the pressing roller 11 into the depression by relying on internal hydraulic extension. This not only improves the applicability of the device, but also makes the flexible protective netting fit tightly against the surface to be laid, further improving the laying effect.

[0040] The end of the rotating shaft of the pressing roller 11 can be hinged to the telescopic end of the hydraulic telescopic rod 14. In this way, while allowing rotation, a certain height difference can be generated between the two ends of the rotating shaft of the pressing roller 11, so that a single pressing roller 11 can adaptively fit when facing a small slope, thereby improving the laying effect.

[0041] Both ends of the connector 10 are rotatably equipped with buffer rollers 15. The horizontal height of the buffer rollers 15 is lower than that of the pressing rollers 11. When there are excessively rough and large protrusions on the tunnel surface, such as large protruding vertical structures, the buffer rollers 15 replace the pressing rollers 11 and contact the protrusions first, thus protecting the pressing rollers 11 and preventing them from being damaged by direct impact.

[0042] The connector 10 includes U-shaped plates on both sides and a connecting plate at the bottom that connects the two U-shaped plates. A groove is formed between the two U-shaped plates. A rotating shaft is rotatably provided in the middle of the buffer roller 15. The two ends of the rotating shaft are connected to the support arms of the two U-shaped plates respectively. The hydraulic telescopic rod 14 is provided on the outside of the U-shaped plate. The mesh pressing roller 11 is provided corresponding to the groove between the two U-shaped plates.

[0043] The flexible protective netting laying device also includes connecting posts 16, with crossbeams 8 welded or bolted to the top of the connecting posts 16. The gluing equipment 2 and the conveying equipment 3 are both located in the middle of the connecting posts 16. The gluing equipment 2 and the conveying equipment 3 can be bolted together, which allows for disassembly and maintenance later.

[0044] The bottom end of the connecting column 16 can be connected to a vehicle, which can then drive the entire device to move within the tunnel.

[0045] To improve the connection strength between the crossbeam 8 and the connecting column 16, a reinforcing rib 17 is provided between the crossbeam 8 and the connecting column 16.

[0046] The conveying device 3 includes a storage cylinder 18, which contains a rolled-up flexible protective net. The storage cylinder 18 has an output port 19 for the flexible protective net to be output. As the pressing rollers 11 are laid, the flexible protective net inside the storage cylinder 18 is automatically extracted.

[0047] To facilitate the insertion of new net rolls, a rotating shaft 20 is detachably installed in the middle of the net storage cylinder 18. The detachable method is that both ends of the rotating shaft 20 pass through the net storage cylinder 18 and are threadedly connected to nuts. The nuts act as limiting components to prevent the rotating shaft 20 from coming out. Alternatively, the rotating shaft 20 itself is a bolt, with the free ends of the bolts passing through both ends of the net storage cylinder 18 and connected to nuts. It is necessary to ensure that the part of the bolt corresponding to the inside of the net storage cylinder 18 is a smooth surface. The net storage cylinder 18 has a net roll inlet for the roll of flexible protective netting to enter. The roll of flexible protective netting is rotatably mounted on the rotating shaft 20.

[0048] In actual use, emulsion-type pressure-sensitive adhesive is selected to fix the flexible protective net on the surface to be laid. The pressure-sensitive adhesive is pumped to the pressure-sensitive adhesive nozzle 5, and thus evenly sprayed on the flexible protective net. After a certain pressure is applied by the hydraulic telescopic rod 14 of the net laying equipment 1 through the net pressing roller 11, the pressure-sensitive adhesive can temporarily fix the flexible protective net on the surface to be laid.

[0049] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0050] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0051] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A flexible protective net laying device, characterized in that, The device includes a net-laying device for rolling and laying flexible protective netting, an adhesive-applying device, and a conveying device for conveying the flexible protective netting to the net-laying device. The rolling surface of the net-laying device matches the shape of the surface to be laid. The adhesive-applying device includes a pressure-sensitive adhesive pumping mechanism and a pressure-sensitive adhesive nozzle. The pressure-sensitive adhesive pumping mechanism is connected to the pressure-sensitive adhesive nozzle. The pressure-sensitive adhesive nozzle is located on the conveying path of the flexible protective netting and is positioned corresponding to the contact surface between the flexible protective netting and the surface to be laid. The adhesive coating equipment also includes a mesh gluing box, the inner cavity of which is connected to the pressure-sensitive adhesive pumping mechanism. The bottom of the mesh gluing box has a through-hole matching the flexible protective net. A plurality of pressure-sensitive adhesive nozzles are evenly arranged at the outlet position of the through-hole, and these nozzles are arranged sequentially along the width of the flexible protective net. The pressure-sensitive adhesive nozzles are connected to the inner cavity of the mesh gluing box. The surface of the mesh gluing box corresponding to the outlet end of the through-hole is set as an inclined surface, and the pressure-sensitive adhesive nozzles are arranged on this inclined surface, facing the flexible protective net along with the inclined surface. The net-laying equipment includes a crossbeam and several sets of rollers arranged horizontally on the crossbeam. Each roller set includes a connector and pressing rollers. The connector is perpendicular to the crossbeam and is fixedly mounted on the crossbeam. Several pressing rollers are rotatably mounted on the top surface of the connector. A rotating shaft is rotatably mounted in the middle of each pressing roller. The two ends of the rotating shaft are respectively connected to the telescopic ends of a hydraulic telescopic rod. The fixed end of the hydraulic telescopic rod is fixedly connected to the connector. The end of the rotating shaft is hinged to the telescopic end of the hydraulic telescopic rod.

2. The flexible protective net laying device according to claim 1, characterized in that, Both ends of the connector are rotatably equipped with buffer rollers to protect the pressure rollers.

3. The flexible protective net laying device according to claim 1, characterized in that, The flexible protective netting laying device also includes connecting posts, with the crossbeams located at the top of the connecting posts, and the adhesive application equipment and the conveying equipment both located in the middle of the connecting posts.

4. The flexible protective net laying device according to claim 3, characterized in that, Reinforcing ribs are provided between the crossbeam and the connecting column.

5. The flexible protective net laying device according to claim 1, characterized in that, The conveying equipment includes a storage cylinder containing a rolled-up flexible protective net, and the storage cylinder has an output port for the flexible protective net to be output.

6. The flexible protective net laying device according to claim 5, characterized in that, The storage cylinder is detachably equipped with a rotating shaft in the middle. The storage cylinder has a mesh roll inlet for the roll of flexible protective netting to enter. The roll of flexible protective netting is rotatably mounted on the rotating shaft.

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