Spray gun for tunnel concrete spraying

Abstract

The utility model relates to the technical field of concrete spraying equipment, in particular to a spray gun for tunnel concrete spraying, which comprises a base and a spray head. The base is a hard cylindrical tubular body, one end of the base is used for installing the first connector, and the other end of the base extends outwards to form an extending part. The nozzle comprises a connecting seat, an outer skin, a connecting piece and a lining layer; the connecting seat forms a fixing part of the nozzle; the outer skin, the connecting piece and the lining layer form a movable part of the nozzle; a plurality of opening parts are arranged along the surface of the outer skin at equal intervals, and the outer skin is an elastic metal sheet; the lining layer is arranged along the inner wall of the outer skin; when the spray gun sprays concrete, the outer skin expands and restores when concrete spraying is stopped; and the lining layer moves along with the outer skin. According to the utility model, the movable part is arranged on the spray head, so that the movable part is stressed to deform during the concrete spraying operation, and the movable part can automatically reset after the operation is stopped; concrete grout attached to the inner wall of the spray gun is reduced through action of the movable part, and the blocking probability is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of shotcrete equipment, in particular to a spray gun for tunnel shotcrete. Background Technique

[0002] A wet shotcreting machine is a special equipment for spraying concrete, mortar or other liquid materials, and it has a wide range of applications in the fields of construction engineering, tunnel engineering, mine engineering, etc. The wet shotcreting machine usually consists of a spray gun, a pressure pump, a main exhaust fan, a scraper conveyor, an atomization device, a pipeline and a spray rod, etc. It uses the working principle of hydraulic pumping. Through the thrust generated by the hydraulic pump, the liquid material is transported from the pressure pump to the spray gun, and then the material is sprayed onto the surface to be coated through air pressure.

[0003] The working principle of the wet shotcreting machine mainly includes two aspects: one is the principle of water mist cooling, adsorption and sedimentation. By atomizing water at the place where dust is generated, adsorbing dust onto water droplets, and then taking the water into the exhaust fan to be discharged, the purpose of reducing the dust concentration is achieved; the other is the working principle of hydraulic pumping. Using the thrust generated by the hydraulic pump, two oil cylinders reciprocate alternately, and the dense-flow material is transported from the conveying pipeline to the mixing pipe, and forms a thin flow through compressed air and is transported to the nozzle through the pipeline. A certain proportion of accelerator is added at the nozzle and directly sprayed onto the sprayed surface.

[0004] In the prior art, for the shotcrete reinforcement operation on the tunnel construction surface, generally, an automated device plus manual assistance is adopted. For small areas where mechanical equipment is difficult to enter, spraying and reinforcement are generally carried out by manually holding a spray gun. Inevitably, concrete slurry will adhere to the inner wall of the spray gun during use. If it is not cleaned in time after use, it will cause the blockage of the spray gun. Content of the Utility Model

[0005] The purpose of the utility model is to solve the problems existing in the background technique, and to propose a spray gun for tunnel shotcrete. Through the movable part arranged on the nozzle, the movable part deforms under force during the shotcrete operation, and the movable part will automatically reset after the operation stops; by the action of the movable part, the concrete slurry adhering to the inner wall of the spray gun is reduced, and the probability of blockage is decreased.

[0006] The technical solution of the utility model, a spray gun for tunnel shotcrete, includes a base and a nozzle;

[0007] The base is a hard cylindrical tube. One end of it is used to install a first connector, and the other end extends outward to form an extension part; the first connector is connected to the storage tank through a pipeline; the prepared concrete slurry is transported to the nozzle through the storage tank and the pipeline.

[0008] The nozzle is connected to the extension part of the base;

[0009] The spray head includes a connecting seat, an outer skin, a connecting member, and an inner lining layer;

[0010] The connecting seat forms the fixed part of the spray head; the outer skin, the connecting member, and the inner lining layer form the movable part of the spray head; the movable part is connected and fixed to the fixed part through the connecting member;

[0011] The overall shape of the spray head is conical, and its diameter gradually decreases towards the discharging direction; a plurality of opening parts are arranged at equal intervals along the surface of the outer skin, and the outer skin is an elastic metal thin plate; the inner lining layer is arranged along the inner wall of the outer skin, and the inner lining layer is closely attached to the outer skin; the inner lining layer is a flexible metal thin sheet;

[0012] When the spray gun sprays concrete, the outer skin expands and returns to its original state when the spraying stops; according to the spraying pressure, the outer skin expands to different positions; the inner lining layer follows the movement of the outer skin.

[0013] In an alternative embodiment, a second connecting head is provided on the base; the second connecting head is connected to the accelerator storage tank through a pipeline.

[0014] In an alternative embodiment, two symmetrical groups of handles are provided on the extension part.

[0015] In an alternative embodiment, the outside of the handle is wrapped with an anti-slip cushion layer.

[0016] In an alternative embodiment, the inner wall of the connecting seat is connected to the inner lining layer through the connecting member, and the connection part is polished smoothly.

[0017] In an alternative embodiment, after the fixed part and the movable part of the spray head are combined, the inner wall of the connecting seat, the inner wall of the connecting member, and the inner lining layer form a smooth flow guiding surface.

[0018] Preferably, a nozzle is provided at the end of the spray head; the nozzle is a hard circular ring structure.

[0019] In an alternative embodiment, the connecting member is fixed to the connecting seat, the outer skin, and the inner lining layer by welding.

[0020] Preferably, the length of the opening part does not exceed three-quarters of the length of the spray head.

[0021] Preferably, the width of the opening part is 1-3 mm.

[0022] Compared with the prior art, the utility model has the following beneficial technical effects:

[0023] In the present utility model, a movable part is provided on the nozzle. When performing shotcrete operation, the movable part deforms under force, and after the operation stops, the movable part will automatically reset. At the same time, the length of the opening part of the nozzle does not exceed three - quarters of the length of the nozzle, and the width of the opening part is 1 - 3 mm. The appropriate length of the opening part enables most areas of the nozzle to be movable. At the same time, the appropriate width of the opening part allows the movable part to move within a certain range, which is beneficial to reducing the accumulation of concrete slurry on the inner wall of the nozzle and reducing the risk of blockage.

[0024] The outer skin of the present utility model is an elastic metal thin plate, while the inner lining layer is a flexible metal thin sheet. Therefore, when the outer skin expands, it can store elastic potential energy, and after the shotcrete stops, the outer skin resumes its original state. When the inner lining layer moves with the outer skin, a part of the inner lining layer will be squeezed into the opening part, and its deformation amount is greater than that of the outer skin. In addition, after use, the outer skin can also be manually squeezed to make it contract inward. Through a large deformation amount, the inner wall of the nozzle is not easily contaminated with concrete slurry. Cooperating with rinsing with clean water, it is easier to clean the inner wall of the spray gun, making it not easily blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0026] Figure 2 is a schematic diagram of the installation position structure of the second connector in an embodiment of the present utility model;

[0027] Figure 3 is a schematic diagram of the internal structure of the nozzle of the present utility model.

[0028] Reference numerals: 1, first connector; 2, base; 21, second connector; 3, handle; 4, nozzle; 41, connecting seat; 42, outer skin; 43, nozzle; 44, connecting member; 45, opening part; 46, inner lining layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Embodiment 1

[0030] As Figure 1 shown, a spray gun for tunnel shotcrete proposed by the present utility model includes a base 2 and a nozzle 4;

[0031] The base 2 is a rigid cylindrical tube. One end is used to install the first connector 1, and the other end extends outward to form an extension part. The first connector 1 is connected to the storage tank through a pipeline. The prepared concrete slurry is conveyed to the nozzle through the storage tank and the pipeline.

[0032] The nozzle 4 is connected to the extension of the base 2; the nozzle 4 includes a connecting seat 41, an outer skin 42, a connecting member 44, and a lining layer 46; the connecting seat 41 constitutes the fixing part of the nozzle 4; the outer skin 42, the connecting member 44, and the lining layer 46 constitute the movable part of the nozzle 4; the movable part is connected and fixed to the fixing part through the connecting member 44;

[0033] The whole nozzle 4 is conical, and its diameter gradually decreases towards the discharging direction; a plurality of opening parts 45 are arranged at equal intervals along the surface of the outer skin 42, and the outer skin 42 is an elastic metal thin plate; the lining layer 46 is arranged along the inner wall of the outer skin 42, and the lining layer 46 is closely attached to the outer skin 42; the lining layer 46 is a flexible metal thin sheet;

[0034] When the gun sprays concrete, the outer skin 42 expands. According to the spraying pressure, the outer skin 42 expands to different positions, and the deformation amount is different. The greater the pressure, the greater the deformation amount. At the same time, the lining layer 46 follows the movement of the outer skin 42; when the spraying of concrete stops, the outer skin 42 and the lining layer 46 return to their original states; since the outer skin 42 is an elastic metal thin plate and the lining layer 46 is a flexible metal thin sheet; therefore, after the outer skin 42 expands, elastic potential energy can be stored, and the outer skin 42 returns to its original state after the spraying of concrete stops; when the lining layer 46 follows the movement of the outer skin 42, a part of the lining layer 46 will be squeezed into the opening part 45, and its deformation amount is greater than that of the outer skin 42. In addition, after use, the outer skin 42 can also be manually squeezed to contract inward, and due to the large deformation amount, the inner wall of the nozzle 4 is not easily contaminated with concrete slurry; it is easier to clean the inner wall of the gun by cooperating with flushing with clean water, and it is not easily blocked.

[0035] Embodiment 2

[0036] As Figure 2 shown, a gun for tunnel concrete spraying proposed by the present utility model has a second connector 21 arranged on the base 2; the second connector 21 is connected to the accelerator storage tank through a pipeline; during the concrete spraying operation, the accelerator can be synchronously injected into the nozzle 4 through the storage tank and the pipeline, so that the sprayed concrete slurry can quickly solidify.

[0037] In this embodiment, two groups of symmetric handles 3 are arranged on the extension part, and the outer part of the handle 3 is wrapped with an anti-slip cushion; when in use, it is easier for workers to hold the handle 3 to align the nozzle with the area to be constructed, which is convenient for evenly spraying concrete slurry; and the anti-slip cushion wrapped on the outer part of the handle 3 can not only play an anti-slip role, but also play a heat insulation role.

[0038] Embodiment 3

[0039] As Figure 3As shown, a spray gun for tunnel shotcrete proposed by the present utility model, different from Embodiment 1, in this embodiment, the inner wall of the connecting seat 41 is connected to the inner lining layer 46 through a connecting member 44, and the connection part is polished smoothly. After the fixed part and the movable part of the nozzle 4 are combined, the inner wall of the connecting seat 41, the inner wall of the connecting member 44 and the inner lining layer 46 form a smooth flow guiding surface.

[0040] The smooth flow guiding surface is not easy to condense concrete, which is beneficial to reducing the risk of blockage of the nozzle 4.

[0041] In this embodiment, a nozzle 43 is provided at the end of the nozzle 4; the nozzle 43 is a hard circular ring structure; the nozzle 43 is hard in texture, more wear-resistant during long-term use, and can support the movable part to increase the strength at the same time.

[0042] In this embodiment, the connecting member 44 is fixed to the connecting seat 41, the outer skin 42 and the inner lining layer 46 by welding.

[0043] The length of the opening part 45 does not exceed three-quarters of the length of the nozzle 4, and the width of the opening part 45 is 1-3 mm. The length of the opening part 45 is appropriate, so that most areas of the nozzle 4 can move; at the same time, the width of the opening part 45 is appropriate, so that the movable part can move within a certain range, which is beneficial to reducing the accumulation of concrete slurry on the inner wall of the nozzle 4 and reducing the risk of blockage.

[0044] The embodiments of the present utility model have been described in detail above with reference to the drawings, but the present utility model is not limited thereto. Various changes can be made without departing from the spirit of the present utility model within the knowledge scope of those skilled in the art.

Claims

1. A spray gun for tunnel concrete spraying, characterized in that: It comprises a base (2) and a nozzle (4); The base (2) is a hard cylindrical tubular body, one end of which is used to install the first connector (1), and the other end extends outward to form an extension portion; the first connector (1) is connected to the storage tank through a pipeline; The nozzle (4) is connected to the extension portion of the base (2); The nozzle (4) comprises a connecting seat (41), an outer skin (42), a connecting piece (44) and an inner lining layer (46); The connecting seat (41) constitutes the fixed part of the nozzle (4); the outer skin (42), the connecting piece (44) and the inner lining layer (46) constitute the movable part of the nozzle (4); the movable part is connected and fixed to the fixed part via the connecting piece (44); The nozzle (4) is generally conical in shape, and its diameter gradually decreases toward the discharge direction; a plurality of openings (45) are arranged at equal intervals along the surface of the outer skin (42), and the outer skin (42) is a metal sheet with elasticity; an inner lining layer (46) is arranged along the inner wall of the outer skin (42), and the inner lining layer (46) is tightly fitted with the outer skin (42); the inner lining layer (46) is a flexible metal sheet; When the spray gun sprays concrete, the outer skin (42) expands and recovers when the spraying stops. According to the spraying pressure, the outer skin (42) expands to different positions. The inner lining layer (46) moves following the outer skin (42).

2. The tunnel spraying gun according to claim 1, characterized in that: A second connector (21) is arranged on the base (2); the second connector (21) is connected to the quick-setting agent storage tank via a pipeline.

3. The tunnel spraying gun according to claim 1, characterized in that: Two groups of symmetrical handles (3) are arranged on the extension part.

4. The tunnel spraying gun according to claim 3, characterized in that: The handle (3) is wrapped with an anti-skid pad layer.

5. The tunnel spraying gun according to claim 1, characterized in that: The inner wall of the connecting seat (41) is connected to the inner lining layer (46) through a connecting piece (44), and the connection is polished and smooth.

6. The tunnel spraying gun according to claim 5, characterized in that: After the fixed part and the movable part of the nozzle (4) are combined, the inner wall of the connecting seat (41), the inner wall of the connecting piece (44) and the inner lining layer (46) form a smooth flow-guiding surface.

7. The tunnel spraying gun according to claim 1, characterized in that: A nozzle (43) is arranged at the end of the spray head (4); the nozzle (43) is a hard annular structure.

8. The tunnel spraying gun according to claim 1, characterized in that: The connecting piece (44) is fixed to the connecting seat (41), the outer skin (42) and the inner lining layer (46) by welding.

9. The tunnel spraying gun according to claim 1, characterized in that: The length of the opening (45) does not exceed three quarters of the length of the nozzle (4).

10. The tunnel spraying gun according to claim 1, characterized in that: The width of the opening (45) is 1-3 mm.

Images