CN215237667U - Porous position gas-liquid mixture whitewashing device - Google Patents

Abstract

The utility model provides a porous position gas-liquid mixture whitewashing device, includes the injection pipe, and the injection pipe passes through the pipe connection sediment stuff pump, the injection pipe is bilayer structure, and the skin is for depositing the thick liquid pipe, and the inlayer is the intake pipe, deposits and sets up the whitewashing hole on the thick liquid pipe, corresponds the position with the whitewashing hole in the intake pipe and sets up the air jet, deposits thick liquid pipe inner wall and intake pipe outer wall contactless, deposits thick liquid pipe both ends and seals, deposits and sets up into thick liquid mouth, intake-tube connection compressed air pipeline on the thick liquid pipe.

Description

Porous position gas-liquid mixture whitewashing device

Technical Field

The utility model relates to a whitewashing device that is used for alloy or non-metallic molten material casting machine especially relates to a porous position gas-liquid mixture whitewashing device.

Background

The special material casting machine is a continuous production device for casting high-temperature molten alloy molten iron or non-metallic materials into shapes and granularity required by customers. The casting die is a key part, a batch part and an easy-to-wear part of the casting machine, and the service life of the casting die is directly related to the production cost of alloy manufacturers. The service life of the casting die is determined by the inherent quality of the casting die, namely, the service life of the casting die is related to the rationality of materials, structures, an annealing process and the like; on the other hand, the method is determined by using and maintaining conditions, namely the reasonability of a spray cooling process and a slurry spraying process. The casting die has very bad working conditions, and can bear the erosion of molten alloy iron up to 1650 ℃ (the temperature of molten non-metal material is 2200 ℃) and the chilling of cooling water. The guniting device on the existing pig casting machine usually adopts a mode of directly spraying a slurry pump, so that the pressure is high, slurry splashes everywhere, the control is not easy, and the guniting effect is not ideal. And secondly, the spray hole is easy to block, and the phenomenon that the casting die is not sprayed with sizing agent and has no spraying effect is not easily found during continuous operation. The conventional spray pipes are generally 3-5 spray pipes, the inner diameter of each spray pipe is 20-25mm, and the spray pipes are suitable for producing large iron blocks (the external dimension of a single block is about 250X 180X 95 mm) and are not suitable for spraying slurry of an alloy casting machine. Most customers in the market require the alloy casting machine to directly cast the high-temperature alloy molten iron into casting blocks with the diameter of 30-120mm, so that each casting die is provided with 2/4 rows of die cavities with the diameter of 30-120mm, and the number of the die cavities in each row is 5-14; the conventional guniting device cannot realize the multi-hole site guniting effect.

More than 97 percent of the currently used slurry spraying devices in China are used for direct spraying of slurry pumps, compressed air slurry spraying, centrifugal slurry spraying and the like. The slurry spraying device using the pure compressed air as power has low slurry concentration, a slurry hanging layer is thin, a slurry storage tank is required to be arranged below the chain belt, the slurry storage tank is easy to be broken and filled by falling iron blocks or slag iron, and the slurry spraying effect needs to be further improved. The centrifugal guniting is suitable for occasions with high slurry concentration, but a slurry storage groove is required to be arranged below the chain belt, the problems of filling and smashing by falling iron blocks and slag iron exist, the cleaning is difficult, and the guniting effect is not uniform.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the above-mentioned prior art, the utility model aims at providing a porous position gas-liquid mixture whitewashing device solves the problem that exists among the prior art.

The purpose of the utility model is realized with the following mode:

the utility model provides a porous position gas-liquid mixture whitewashing device, includes the injection pipe, and the injection pipe passes through the pipe connection sediment stuff pump, the injection pipe is bilayer structure, and the skin is for depositing the thick liquid pipe, and the inlayer is the intake pipe, deposits and sets up the whitewashing hole on the thick liquid pipe, corresponds the position with the whitewashing hole in the intake pipe and sets up the air jet, deposits thick liquid pipe inner wall and intake pipe outer wall contactless, deposits thick liquid pipe both ends and seals, deposits and sets up into thick liquid mouth, intake-tube connection compressed air pipeline on the thick liquid pipe.

Furthermore, the injection pipe is provided with guniting holes according to the width and the number of the die cavities of the casting die, and the air inlet pipe is provided with air nozzles which correspond to the guniting holes one to one.

Preferably, the two slurry pumps are connected with the pipeline, a discharge valve is arranged on the pipeline between the two slurry pumps, and an outlet of each slurry pump is provided with an adjusting valve I for adjusting the slurry flow of the injection pipe.

Further, the inlet of the slurry pump is connected with a slurry making pool, and a stirring device is arranged in the slurry making pool.

Furthermore, one end of a compressed air pipeline is connected with an air inlet pipe, the other end of the compressed air pipeline is connected with an air compressor, an adjusting valve II is arranged on the air compressor to adjust the flow rate of gas in the air inlet pipe, and the air compressor is provided with a pressure gauge.

Specifically, deposit thick liquid pipe one end and set up the flange of covering thoroughly, other end fixed connection blind plate, the thick liquid intraductal is being deposited to the blind plate one end that is close to of intake pipe, the other end stretches out and deposits thick liquid union coupling compressed air pipeline, it fixes a position and fixes to set up the locating hole board to the intake pipe between the jet orifice and the blind plate that are close to the blind plate nearest, set up the flange and cover flange cooperation sealing connection thoroughly, the flange center sets up the outer wall cooperation of round hole and intake pipe, fix a position and fix the intake pipe, the outer wall of intake pipe one end is connected with the round hole cooperation that the flange center set up, the other end is fixed and is set up the shrouding.

Specifically, the flange and the transparent cover flange are respectively provided with two symmetrical radial grooves, the pull rod is matched with the flange and the symmetrical radial grooves of the transparent cover flange to connect the flange and the transparent cover flange, one end of the pull rod is provided with a stop block with a size larger than the symmetrical radial grooves, the other end of the pull rod is provided with a hole matched with a wedge plate, the wedge plate is inserted into the hole to fix the flange and the transparent cover flange, and a sealing gasket is arranged between the flange and the transparent cover flange.

Compared with the prior art, the utility model discloses can carry high concentration thick liquid through the sediment stuff pump, be favorable to the casting die to hang the thick liquid, hang thick liquid layer. The slurry pump and the compressed air are adopted for mixing and spraying slurry, so that the problems that the direct spraying pressure of the slurry pump is high, slurry splashes everywhere and is difficult to control are solved, the problems that gas and liquid are not uniformly mixed and the force is poor due to the fact that only one spraying pipe is arranged below the chain belt are solved, and the problems that the slurry pump is broken or blocked due to falling iron and iron blocks are avoided. The device utilizes the double-layer injection pipe to evenly spray the slurry into each die cavity of the alloy casting die, the gas-liquid mixing structure can reduce the use amount of the slurry, the slurry is completely attached to the inner die cavity of the casting die at a certain temperature, the slurry spraying amount is small, the slurry spraying thickness is large, splashing and self-flowing phenomena are avoided, and a slurry return device is not needed; the existing conventional injection pipe is changed into a double-layer injection pipe, and the multi-hole position guniting can be realized by arranging the guniting holes according to the width and the number of the die cavities of the casting die, so that the guniting use of an alloy casting machine can be met; after the cast iron is finished, the guniting device is closed, and the grout in the guniting hole can be cleaned by increasing the pressure of compressed air without blockage. When the device is not used for a long time, the drainage valve is opened to discharge the slurry in the pipeline, so that the pipeline is not blocked, and the next operation is facilitated. The quick-change type multi-hole nozzle-free injection pipe is convenient to install, use and maintain.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic top view of fig. 1 according to the present invention.

Fig. 3 is a schematic view of a casting die structure.

Fig. 4 is a schematic view of the structure of the injection pipe.

Fig. 5 is a structural schematic diagram of a pulp inlet.

Fig. 6 is a schematic view of the structure of the injection pipe a.

FIG. 7 is a schematic sectional view B-B of the injection pipe.

Fig. 8 is a schematic view of a drawbar arrangement.

FIG. 9 is a schematic illustration of a cam plate configuration.

Wherein, 1-casting mould; 2-a jet pipe; 3-a pipeline; 4-slurry pump; 401-regulating valve I; 5-a vent valve; 6-a stirring device; 7-an air compressor; 701-adjusting valve II; 8-a pressure gauge; 9-compressed air pipeline; 10-an air inlet pipe; 1001-air jet; 11-a pull rod; 1101-a stop block; 1102-holes; 12-a flange; 13-a gasket; 14-a tapered wedge plate; 15-a transparent cover flange; 16-a pulp storage pipe; 1601-a guniting hole; 1602-pulp inlet; 17-positioning the orifice plate; 18-closing the plate; 19-a blind plate; and 20-pulping tank.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

As shown in fig. 1-8, a multi-hole-site gas-liquid mixing guniting device comprises an injection pipe 2, the injection pipe 2 is connected with a slurry pump 4 through a pipeline 3, the injection pipe 2 is installed below a chain belt of a pig machine, the injection pipe 2 is of a double-layer structure, a slurry storage pipe 16 is arranged on the outer layer, an air inlet pipe 10 is arranged on the inner layer, a slurry spraying hole 1601 is arranged on the slurry storage pipe 16, an air jet port 1001 corresponding to the slurry spraying hole 1601 is arranged on the air inlet pipe 10, the inner wall of the slurry storage pipe 16 is not in contact with the outer wall of the air inlet pipe 10, two ends of the slurry storage pipe 16 are sealed, a slurry inlet 1602 is arranged on the slurry storage pipe 16, the slurry inlet 1602 is connected with a pipeline 3, and the end of the air inlet pipe 10 is connected with a compressed air pipeline 9.

The slope of pipeline 3 sets up, and pipeline 3 when the installation slope certain angle specifically be pipeline 3 and injection pipe 2 be connected the one end highly be higher than the pipeline 3 with the height that the one end is connected to slurry pump 4, set up like this and be favorable to the utility model discloses open the thick liquid in the 5 discharge pipe of relief valve 3 when not using.

Injection pipe 2 sets up whitewashing hole 1601 according to casting die 1's die cavity width and die cavity quantity setting, casting die 1 is located injection pipe 2 top, the whitewashing hole 1601 that sets up on injection pipe 2 is relative with casting die 1, whitewashing hole 1601 is located whitewashing pipe 2 upper portion, set up the air jet 1001 with whitewashing hole 1601 one-to-one on intake pipe 10, make things convenient for compressed air to drive thick liquids and spout on the die cavity in casting die 1, gas-liquid mixture structure can make the thick liquids use amount few, it adheres to completely on the interior die cavity of casting die 1 of a definite temperature to spray, no thick liquids splash and the phenomenon of flowing automatically, need not the device of destarching.

The outer diameter of the slurry storage pipe 16 is 76-114mm, the wall thickness is 4-5mm, a row of slurry spraying holes 1601 are formed in the pipe wall of the slurry storage pipe 16 along a generating line, the number of the slurry spraying holes 1601 is the same as that of the inner cavities of the casting die 1, and one slurry spraying hole 1601 corresponds to the center line position of each inner cavity of the casting die 1. The guniting holes 1601 are tapered holes, large holes of the guniting holes 1601 are formed in the outer wall of the grout storing pipe 16, and small holes of the guniting holes are formed in the inner wall of the grout storing pipe 16, so that the guniting holes are beneficial to umbrella-shaped diffusion of grout and cover the inner wall of the whole die cavity. The diameter of the small hole is 5-8mm, the conical surface angle is 60-120 degrees, a grout inlet 1602 is formed in the lower middle part of the tube wall of the grout storing tube 16, the outer diameter of the air inlet tube 10 is 27-34mm, the wall thickness is 3-4mm, air nozzles 1001 which correspond to the grout spraying holes 1601 in one-to-one mode are arranged on the air inlet tube 10, the large holes of the air nozzles 1001 are formed in the outer wall of the air inlet tube 10, the small holes are formed in the inner wall of the air inlet tube 10, the diameter of the small holes is 3-6mm, and the conical surface angle is 60-120 degrees; during assembly, the air vents 1001 and the grout spraying holes 1601 are ensured to be in one-to-one correspondence, and the air and liquid are uniformly sprayed into the die cavity of the alloy casting die after being mixed.

Slurry pump 4 sets up two, and one of them is as reserve, and two slurry pumps 4 all are connected with pipeline 3, set up the drain valve 5 on the pipeline between two slurry pumps 4, set up the drain valve 5 and be in order not using for a long time the utility model discloses the time can prevent that the thick liquid from blocking pipeline 3 through unnecessary thick liquid in the drain valve 5 discharge pipeline 3, the export of slurry pump 4 sets up governing valve I401 and adjusts the thick liquid flow of injection pipe 2.

The inlet of the slurry pump 4 is connected with a slurry making pool 20, a stirring device 6 is arranged in the slurry making pool 20, the stirring device 6 is a vertical stirrer, and the vertical stirrer is arranged in the middle of the slurry making pool 20 and is used for stirring the slurry uniformly; the top in pulping pond 20 sets up the pump frame, and one side of agitating unit 6 sets up the pump frame, 2 sediment stuff pumps 4 of fixed on the pump frame.

One end of a compressed air pipeline 9 is connected with an air inlet pipe 10, the other end of the compressed air pipeline is connected with an air compressor 7, the pressure of the air compressor 7 is 0.3-0.8Mpa, an adjusting valve II 701 is arranged on the air compressor 7 and used for adjusting the air pressure in the air inlet pipe 10, the air compressor 7 is provided with a pressure gauge 8, an operator can obtain the pressure value of air through the pressure gauge 8, and whether the pressure in the air inlet pipe 10 needs to be adjusted through the adjusting valve II 701 is determined according to the value displayed by the pressure gauge 8.

Deposit thick liquid pipe 16 one end and set up through lid flange 15, other end fixed connection blind plate 19, the thick liquid pipe 16 is being deposited to the nearly blind plate 19 one end of intake pipe 10, the other end stretches out and deposits thick liquid pipe 16 and connect compressed air pipeline 9, it fixes a position the orifice plate 17 and fix intake pipe 10 to set up between the jet-propelled mouth 1001 and the blind plate 19 that are closest to blind plate 19, set up flange 12 and cover flange 15 cooperation sealing connection thoroughly, flange 12 center sets up the outer wall cooperation of round hole and intake pipe 10, fix a position and fix intake pipe 10, the outer wall of intake pipe 10 one end is connected with the round hole cooperation that flange 12 center set up, the other end is fixed and is set up shrouding 18.

The flange 12 and the transparent cover flange 15 are respectively provided with two symmetrical radial grooves, the pull rod 11 is matched with the symmetrical radial grooves of the flange 12 and the transparent cover flange 15 to connect the flange 12 and the transparent cover flange 15, one end of the pull rod 11 is provided with a stop block 1101 with the size larger than the symmetrical radial grooves, the other end of the pull rod is provided with a hole 1102 matched with the inclined wedge plate 14, the inclined wedge plate 14 is inserted into the hole 1102 to fix the flange 12 and the transparent cover flange 15, and a sealing gasket 13 is arranged between the flange 12 and the transparent cover flange 15.

The pipeline 3 and the slurry storage pipe 16 are made of DN80 steel pipes, the compressed air pipeline 9 is made of a rubber hose, the air inlet pipe 10 is made of DN20 steel pipes, and the pipeline 3, the air inlet pipe 10 and the slurry storage pipe 16 can be made of stainless steel or low-carbon steel; the pull rod 11 and the wedge plate 14 are made of 45 # steel, the flange 2, the through cover flange 15, the positioning hole plate 17, the closing plate 18 and the blind plate 19 are made of Q235, and the sealing gasket 13 is made of rubber.

The utility model discloses specific operating principle is as follows:

before the casting operation, preparing slurry with the concentration of 50-70%, and setting the air pressure of an air compressor 7, wherein the pressure range of the air compressor 7 is between 0.3 and 0.8MPa, and the preferable pressure range is between 0.3 and 0.5 MPa.

And adjusting the flow of the slurry pump 4 and the pressure of the air compressor 7 by using the adjusting valve I and the adjusting valve II to form a slurry coating layer with the thickness of 1-2mm after slurry spraying, stopping adjusting when no slurry splashing and gravity flow phenomenon exists, recording the positions of the adjusting valve I and the adjusting valve II when no slurry splashing and gravity flow phenomenon exists, and marking.

After the main machine of the casting machine is started, the casting die 1 runs along with the chain belt, high-temperature molten iron is cast into the casting die 1, then water is sprayed and cooled to form an ingot, the ingot rotates 180 degrees to the driving chain wheel, the die cavity faces downwards, and the ingot falls. When the casting die 1 continues to move downwards to the driven wheel, the casting die 1 rotates 180 degrees, the die cavity faces upwards and is used for containing high-temperature molten iron, and the casting operation is completed through the reciprocating circulation. The stirrer keeps working state during the casting operation to keep the slurry uniform.

During the casting operation, when the casting die 1 with the cast ingot unloaded runs to the injection pipe 2, the regulating valve II is firstly opened to the marking position, and then the regulating valve I is opened to the marking position to carry out the guniting operation. The slurry with a certain concentration is sprayed onto a die cavity in the casting die 1 through the spraying pipe 2, and is dried by using the residual heat of the casting die 1 to form a slurry coating layer with the thickness of 1-2 mm. So as to play the roles of heat insulation and high-temperature molten iron isolation and effectively prolong the service life of the casting die 1.

And after the casting operation is finished, the casting die 1 continues to operate for 2-3 weeks, and the slurry spraying operation is kept, so that an effective slurry coating layer is formed by utilizing the waste heat of the casting die 1 and is used for the next casting operation.

When the guniting operation is completed, the guniting pump 4 is closed firstly, then the drainage valve 5 is opened, and redundant grout in the pipeline 3 flows back into the stirring pool. And after the slurry flows back, closing the regulating valve I and the drain valve 5. Keeping the compressed air to continue, opening the adjusting valve II, cleaning the air jet ports 1001 and the grout spraying holes 1601 of the injection pipe 2 by using the compressed air, and preventing the grout from blocking the air jet ports 1001 and the grout spraying holes 1601. The regulating valve ii and the air compressor 7 are then closed.

Thus, the plurality of cavities in the casting die 1 are sprayed with slurry, and after the residual heat of the casting die 1 is used for drying, an effective slurry coating layer is formed. The direct erosion of high-temperature molten alloy molten iron or non-metallic materials to the casting die 1 can be avoided, surface cracks of the cavity in the casting die 1 are filled, the heat insulation effect is achieved, the demolding effect of the guniting operation is achieved, and the service life of the casting die 1 is prolonged. In addition, the problem of poor slurry hanging effect of multiple holes and shallow hole sites is solved. The slurry concentration is high, the slurry consumption is small in the whole slurry spraying operation process, and the slurry turbulence phenomenon does not exist on the ground below the chain belt.

Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.

Claims (10)

1. The utility model provides a porous position gas-liquid mixture whitewashing device, includes injection pipe (2), and injection pipe (2) are through pipeline (3) connection sediment stuff pump (4), its characterized in that: injection pipe (2) are bilayer structure, and outer for depositing thick liquid pipe (16), the inlayer is intake pipe (10), deposit and set up whitewashing hole (1601) on thick liquid pipe (16), set up air jet (1001) with whitewashing hole (1601) corresponding position on intake pipe (10), deposit thick liquid pipe (16) inner wall and intake pipe (10) outer wall contactless, deposit thick liquid pipe (16) both ends and seal, deposit and set up into thick liquid mouth (1602) on thick liquid pipe (16), intake pipe (10) end connection compressed air pipeline (9).

2. The multi-hole-site gas-liquid mixing guniting device according to claim 1, wherein: the pipeline (3) is obliquely arranged.

3. The multi-hole-site gas-liquid mixing guniting device according to claim 1, wherein: the air jet ports (1001) and the guniting holes (1601) are conical holes.

4. The multi-hole-site gas-liquid mixing guniting device according to claim 1, wherein: deposit and be provided with a plurality of whitewashing holes (1601) on thick liquid pipe (16), the quantity of whitewashing hole (1601) sets up according to the die cavity width and the die cavity quantity of casting die (1), sets up jet opening (1001) with whitewashing hole (1601) one-to-one on intake pipe (10).

5. The multi-hole-site gas-liquid mixing guniting device according to claim 1, wherein: the slurry pump (4) has two, and two slurry pumps (4) all are connected with pipeline (3), set up drain valve (5) on the pipeline between two slurry pumps (4), and the export of slurry pump (4) sets up governing valve I (401) and adjusts the thick liquid flow of injection pipe (2).

6. The multi-hole-site gas-liquid mixing guniting device according to claim 1, wherein: the inlet of the slurry pump (4) is connected with the pulping pool (20), and the stirring device (6) is arranged in the pulping pool (20).

7. The multi-hole-site gas-liquid mixing guniting device according to claim 1, wherein: one end of the compressed air pipeline (9) is connected with an air inlet pipe (10), the other end of the compressed air pipeline is connected with an air compressor (7), an adjusting valve II (701) is arranged on the air compressor (7) and used for adjusting the air pressure in the air inlet pipe (10), and the air compressor (7) is provided with a pressure gauge (8).

8. The multi-hole-site gas-liquid mixing guniting device according to claim 1, wherein: deposit thick liquid pipe (16) one end and set up and pass through lid flange (15), other end fixed connection blind plate (19), what be close to blind plate (19) one end of intake pipe (10) is depositing thick liquid pipe (16) in, the other end stretches out and deposits thick liquid pipe (16) and connect compressed air pipeline (9), set up locating hole board (17) between air jet (1001) and blind plate (19) that are closest to blind plate (19) and fix a position and fix intake pipe (10), set up flange (12) and pass through lid flange (15) cooperation sealing connection, flange (12) center sets up the outer wall cooperation of round hole and intake pipe (10), fix a position and fix intake pipe (10), the outer wall of intake pipe (10) one end is connected with the round hole cooperation that flange (12) center set up, other end fixed set up shrouding (18).

9. The multi-hole-site gas-liquid mixing guniting device according to claim 8, wherein: the flange (12) and the transparent cover flange (15) are respectively provided with two symmetrical radial grooves, the pull rod (11) is matched with the flange (12) and the symmetrical radial grooves of the transparent cover flange (15) to connect the flange (12) and the transparent cover flange (15), one end of the pull rod (11) is provided with a stop block (1101) with the size larger than the symmetrical radial grooves, the other end of the pull rod is provided with a hole (1102) matched with a wedge plate (14), the wedge plate (14) is inserted into the hole (1102) to fix the flange (12) and the transparent cover flange (15), and a sealing gasket (13) is arranged between the flange (12) and the transparent cover flange (15).

10. The multi-hole-site gas-liquid mixing guniting device according to claim 9, wherein: the outer diameter of the slurry storage pipe (16) is 76-114mm, the wall thickness is 4-5mm, the slurry spraying holes (1601) are formed in the wall of the slurry storage pipe (16) along a bus, the number of the slurry spraying holes (1601) is the same as that of the inner cavities of the casting die (1), and each inner cavity center line of the casting die (1) corresponds to one slurry spraying hole (1601); the guniting holes (1601) are conical holes, the large holes of the guniting holes (1601) are formed in the outer wall of the slurry storage pipe (16), and the small holes of the guniting holes are formed in the inner wall of the slurry storage pipe (16); the diameter of each small hole is 5-8mm, the conical surface angle is 60-120 degrees, a grout inlet (1602) is formed in the lower middle part of the tube wall of the grout storage tube (16), the outer diameter of the air inlet tube (10) is 27-34mm, the wall thickness is 3-4mm, air nozzles (1001) which correspond to the grout spraying holes (1601) one by one are arranged on the air inlet tube (10), the large holes of the air nozzles (1001) are formed in the outer wall of the air inlet tube (10), the small holes are formed in the inner wall of the air inlet tube (10), the diameter of each small hole is 3-6mm, and the conical surface angle is 60-120 degrees; and during assembly, the air nozzles (1001) and the guniting holes (1601) are ensured to be in one-to-one correspondence.

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