Pneumatic concrete spraying device for concrete spraying machine

Abstract

The invention discloses a pneumatic concrete spraying device for a concrete spraying machine. The pneumatic concrete spraying device comprises a contraction spraying opening, a spraying shell, a spiral conveying shaft, a supporting bearing seat and a driving part. The spiral conveying shaft comprises a shaft body and a variable-pitch spiral blade fixed on the outer wall of the shaft body; the shaft body is a hollow pipe body, and a main air channel is formed in the shaft body; the main air channel is connected with an air supply device through a main air connector. The contraction injection opening comprises a rotational flow auxiliary air bag and a conical injection barrel. A necking part is formed at the end, away from the driving piece, of the injection shell, an air inlet interlayer is reserved between the inner wall of the conical injection barrel and the outer wall of the necking part, rotational flow auxiliary air blades are arranged in the air inlet interlayer, and the injection shell is sleeved with the rotational flow auxiliary air bag. The pneumatic conveying mode that main air and auxiliary air are matched is adopted, the spraying continuity and uniformity are enhanced, concrete at the spraying opening is in a suspended state, and the problem that the concrete blocks the pipe is not prone to occurring.

Description

Technical Field

[0001] The invention relates to the technical field of concrete spraying machines, in particular to a concrete pneumatic spraying device for a concrete spraying machine. Background Art

[0002] At present, the most common method of coal mine tunnel support is anchor spraying support, which uses a concrete shotcrete machine to spray concrete mixed with quick-setting agent onto the support surface. After the concrete comes into contact with the surrounding rock, it can form a layer of bearing ring with a certain strength in a relatively short time, which plays a role in supporting the tunnel.

[0003] The concrete spraying part is a key component of the shotcrete machine. It is the outlet of the concrete spraying, which determines the range and effect of the spraying and enables the concrete to be sprayed onto the sprayed surface. The spraying part of most existing shotcrete machines uses a rotor or plunger pump to transport concrete. The friction plate or plunger bar accessories consume a lot of energy, which is prone to concrete pipe blockage. In addition, there is a "pulse" phenomenon during the spraying process, which affects the spraying effect. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a pneumatic concrete injection device for a concrete spraying machine, which adopts a pneumatic conveying method with the cooperation of main wind and auxiliary wind to increase the continuity of injection, reduce the uneven injection of concrete, and make the concrete at the injection port in a suspended state, which is less likely to cause the problem of concrete pipe blockage.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a pneumatic concrete spraying device for a concrete spraying machine, comprising a contraction spraying port, a spraying housing, a spiral conveying shaft, a supporting bearing seat and a driving member; the contraction spraying port is connected to one end of the spraying housing;

[0006] The spiral conveying shaft comprises a shaft body and a variable pitch spiral blade fixed on the outer wall of the shaft body; one end of the shaft body is arranged in the injection shell and is rotatably connected with the injection shell; the other end of the shaft body passes through the injection shell and is arranged in the support bearing seat; the support bearing seat is used to provide support for the spiral conveying shaft; the output end of the driving member is connected to the spiral conveying shaft, so as to drive the spiral conveying shaft to rotate;

[0007] One end of the shaft body passing through the injection shell is connected to a main air joint, and the shaft body is a hollow tube body, and a main air channel is formed inside the shaft body; the main air channel is connected to the main air joint, and the main air joint is connected to the air supply device through a pipeline, and the air supply device provides compressed air into the injection shell as the main power for concrete injection;

[0008] The spraying direction of the contraction injection port is the same as the conveying direction of the spiral conveying shaft, and the contraction injection port includes a swirl auxiliary air bag and a conical injection tube;

[0009] A constricted portion is formed at one end of the injection housing away from the driving member, an end of the conical injection tube with a relatively larger outer diameter is sleeved outside the constricted portion of the injection housing, and an air inlet interlayer is left between the inner wall of the conical injection tube and the outer wall of the constricted portion, a plurality of swirl auxiliary wind blades are arranged in the air inlet interlayer, and the swirl auxiliary wind blades are spirally coiled and fixed on the outer wall of the constricted portion;

[0010] The swirl auxiliary air bag is located at one end of the conical injection tube close to the injection shell, and the swirl auxiliary air bag is sleeved outside the injection shell. One end of the swirl auxiliary air bag is sealingly connected to the conical injection tube, and the other end is sealingly connected to the injection shell; an auxiliary air inlet hole is opened on the swirl auxiliary air bag, and the auxiliary air inlet hole is connected to the air supply device through a pipeline.

[0011] Furthermore, the variable pitch helical blade is fixed on the outer peripheral surface of the shaft body in the injection shell, and the pitch of the variable pitch helical blade decreases in the direction approaching the contraction injection port.

[0012] Furthermore, one end of the main air channel away from the main air joint is rotatably connected with an inner spiral blade.

[0013] Furthermore, the injection housing comprises a front housing and a rear housing connected to each other, a quick-release structure is provided between the front housing and the rear housing, and the front housing and the rear housing are detachably connected through the quick-release structure;

[0014] The quick-release structure includes a hoop ring sleeve, a front end ring piece and a rear end ring piece, wherein the front end ring piece is coaxially fixed to the outer circumference of one end of the front end shell body close to the rear end shell; the rear end ring piece is coaxially fixed to the outer circumference of one end of the rear end shell body close to the front end shell body; the hoop ring sleeve is provided with a notch, and connecting pieces are fixed at both ends of the notch of the hoop ring sleeve, and a connecting bolt is passed between the two connecting pieces, and a hoop groove for covering the front end ring piece and the rear end ring piece is provided on the inner side of the hoop ring sleeve.

[0015] Furthermore, the driving component includes a driving motor, a driving sprocket, a driven sprocket and a transmission chain. The driving motor is installed on the vehicle body, the output shaft of the driving motor is coaxially fixed with the driving sprocket, the driven sprocket is located outside the injection shell and is coaxially fixed on the shaft body, and the driving sprocket and the driven sprocket are connected by a transmission chain.

[0016] Beneficial effects of the present invention:

[0017] The invention discloses a pneumatic concrete spraying device for a concrete spraying machine, which adopts a pneumatic conveying mode in which main air and auxiliary air are coordinated, thereby increasing spraying continuity and reducing uneven concrete spraying. Under the joint action of the main airflow and the auxiliary rotating airflow, it is ensured that the concrete material has a higher initial velocity, and the spraying effect is better. Moreover, the auxiliary rotating airflow makes the concrete at the spraying port in a suspended state, and the problem of concrete pipe blockage is not easy to occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a sectional view of the overall structure of the present invention.

[0020] Figure 3 It is a partial exploded view of the present invention for reflecting the structure of the contraction injection port.

[0021] In the figure: 1. contraction injection port; 11. swirl auxiliary air bag; 111. auxiliary air inlet hole; 12. conical injection tube; 13. air inlet interlayer; 14. swirl auxiliary air blade; 2. injection shell; 21. front end shell; 211. necking part; 22. rear end shell; 23. quick release structure; 231. hoop sleeve; 232. connecting piece; 233. front end ring piece; 234. rear end ring piece; 3. spiral conveying shaft; 31. shaft body; 311. main air channel; 32. variable pitch spiral blade; 33. main air joint; 34. inner spiral blade; 4. support bearing seat; 5. driving member; 51. driving motor; 52. driving sprocket; 53. driven sprocket; 54. transmission chain. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the accompanying drawings.

[0023] The invention discloses a concrete pneumatic jetting device for a concrete spraying machine.

[0024] Reference Figure 1 and Figure 2 A concrete pneumatic injection device for a concrete spraying machine includes a contraction injection port 1, an injection shell 2, a screw conveying shaft 3, a support bearing seat 4 and a driving member 5; the contraction injection port 1 is connected to one end of the injection shell 2, and the injection shell 2 is connected to the support bearing seat 4, the driving member 5 and the driving member 5 through the screw conveying shaft 3.

[0025] Reference Figure 1 and Figure 2The spiral conveying shaft 3 includes a shaft body 31 and a variable pitch spiral blade 32 fixed on the outer wall of the shaft body 31; one end of the shaft body 31 is located in the injection housing 2 and is rotatably connected to the injection housing 2, and the other end passes through the injection housing 2; the variable pitch spiral blade 32 is fixed to the outer peripheral surface of the shaft body 31 and is located in the injection housing 2, and the pitch of the variable pitch spiral blade 32 decreases in the direction close to the contraction injection port 1. Therefore, when the spiral conveying shaft 3 is conveying concrete materials, the variable pitch spiral blade 32 can compact the concrete materials to a certain extent, reducing the dispersion and deposition of the concrete materials at the rear end bottom of the contraction injection port 1.

[0026] The support bearing seat 4 is fixed on the vehicle body, and the end of the shaft body 31 away from the injection housing 2 is inserted into the support bearing seat 4 and is rotatably connected to the support bearing seat 4, and the support bearing seat 4 provides support for the concrete injection part. The output end of the driving member 5 is connected to the screw conveying shaft 3, and is used to drive the screw conveying shaft 3 to rotate.

[0027] Reference Figure 1 and Figure 2 The driving member 5 includes a driving motor 51, a driving sprocket 52, a driven sprocket 53 and a transmission chain 54. The driving motor 51 is mounted on the vehicle body. The output shaft of the driving motor 51 is coaxially fixed with the driving sprocket 52. The driven sprocket 53 is located outside the injection housing 2 and coaxially fixedly sleeved on the shaft body 31. The driving sprocket 52 and the driven sprocket 53 are connected by a transmission chain 54. Then the driving motor 51 drives the driving sprocket 52 to rotate, and the driven sprocket 53 is driven to rotate through the transmission chain 54, thereby driving the screw conveying shaft 3 to rotate, and the material in the injection housing 2 is pushed in a spiral manner.

[0028] Reference Figure 1 and Figure 2 The end of the shaft body 31 passing through the injection housing 2 is rotatably connected to the main air joint 33. The shaft body 31 is a hollow tube, and a main air channel 311 is formed inside the shaft body. The main air channel 311 is connected to the main air joint 33. The main air joint 33 is connected to the air supply device through a pipeline. The air supply device provides compressed air as the main power for concrete injection through the main air joint 33. The end of the main air channel 311 away from the main air joint 33 is rotatably connected to the inner spiral blade 34, so that the main air entering through the main air channel 311 has a spiral direction, thereby facilitating the concrete material to be ejected from the contraction injection port 1.

[0029] Reference Figures 1 to 3The spraying direction of the contraction injection port 1 is the same as the conveying direction of the spiral conveying shaft 3. The contraction injection port 1 includes a swirl auxiliary air bag 11 and a conical injection tube 12. A constricted portion 211 is formed at one end of the injection housing 2 away from the driving member 5. The end of the conical injection tube 12 with a relatively large outer diameter is sleeved outside the constricted portion 211 of the injection housing 2, and an air inlet interlayer 13 is left between the inner wall of the conical injection tube 12 and the outer wall of the constricted portion 211. A plurality of swirl auxiliary air blades 14 are arranged in the air inlet interlayer 13, and the swirl auxiliary air blades 14 are spirally wound and fixed on the outer wall of the constricted portion 211. The swirl auxiliary air bag 11 is located at one end of the conical injection tube 12 close to the injection housing 2. The cross-sectional shape of the swirl auxiliary air bag 11 is U-shaped. The swirl auxiliary air bag 11 is sleeved outside the injection housing 2. One end of the swirl auxiliary air bag 11 is sealed and connected to the conical injection tube 12, and the other end is sealed and connected to the injection housing 2. The outer wall of the swirl auxiliary air bag 11 is provided with an auxiliary air inlet hole 111, which is connected to the air supply device through a pipeline. The auxiliary air enters the swirl auxiliary air bag 11 through the auxiliary air inlet hole 111, and then flows into the air inlet interlayer 13. Under the guidance of the swirl auxiliary air blades 14, the auxiliary air is ejected from the inner wall of the conical injection tube 12 in a swirl state, and a rotating air layer is formed on the inner wall of the conical injection tube 12, which not only effectively prevents the concrete material from sticking to the wall, but also can blow up the concrete material scattered at the bottom of the rear end of the contraction injection port 1; the ratio of the main air and the auxiliary air can be adjusted, which effectively solves the problems of concrete material blocking the pipe and uneven injection of the shotcrete machine.

[0030] Reference Figures 1 to 3 The injection housing 2 includes a front housing 21 and a rear housing 22 which are connected to each other. A quick-release structure 23 is provided between the front housing 21 and the rear housing 22. The front housing 21 and the rear housing 22 are detachably connected through the quick-release structure 23. The quick-release structure 23 includes a hoop sleeve 231, a front ring piece 233 and a rear ring piece 234. The front ring piece 233 is coaxially fixed to the outer peripheral surface of one end of the front housing 21 close to the rear housing; the rear ring piece 234 is coaxially fixed to the outer peripheral surface of one end of the rear housing 22 close to the front housing 21; a notch is provided on the hoop sleeve 231, and connecting pieces 232 are fixed at both ends of the notch of the hoop sleeve 231. A connecting bolt is passed between the two connecting pieces 232. A hoop groove for covering the front ring piece 233 and the rear ring piece 234 is provided on the inner side of the hoop sleeve 231. When the front end shell 21 is connected to the rear end shell 22, the hoop ring sleeve 231 is covered on the outside of the front end ring piece 233 and the rear end ring piece 234 through the hoop groove, and then the connecting bolts between the two connecting pieces 232 are tightened to tighten and fix the front end ring piece 233 and the rear end ring piece 234 to complete the assembly of the injection shell 2; conversely, the connecting bolts between the two connecting pieces 232 are loosened and removed, and the front end shell 21 and the rear end shell 22 of the injection shell 2 can be disassembled to facilitate subsequent maintenance and replacement operations.

[0031] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A concrete pneumatic spraying device for a concrete spraying machine, characterized in that: It comprises a contraction injection port (1), an injection housing (2), a spiral conveying shaft (3), a supporting bearing seat (4) and a driving member (5); the contraction injection port (1) is connected to one end of the injection housing (2); The screw conveying shaft (3) comprises a shaft body (31) and a variable pitch screw blade (32) fixed on the outer wall of the shaft body (31); one end of the shaft body (31) is inserted into the injection housing (2) and is rotatably connected to the injection housing (2); the other end of the shaft body (31) passes through the injection housing (2) and is inserted into the support bearing seat (4); the support bearing seat (4) is used to provide support for the screw conveying shaft (3); the output end of the driving member (5) is connected to the screw conveying shaft (3) and is used to drive the screw conveying shaft (3) to rotate; One end of the shaft body (31) passing through the injection shell (2) is connected to a main air joint (33); the shaft body (31) is a hollow tube having a main air passage (311) formed therein; the main air passage (311) is connected to the main air joint (33); the main air joint (33) is connected to an air supply device via a pipeline; the air supply device provides compressed air into the injection shell (2) as the main power for injection of concrete materials; The spraying direction of the contraction injection port (1) is the same as the conveying direction of the spiral conveying shaft (3), and the contraction injection port (1) comprises a swirl auxiliary air bag (11) and a conical injection cylinder (12); A constricted portion (211) is formed at one end of the injection housing (2) away from the driving member (5); an end of the conical injection tube (12) with a relatively large outer diameter is sleeved outside the constricted portion (211) of the injection housing (2); an air inlet layer (13) is left between the inner wall of the conical injection tube (12) and the outer wall of the constricted portion (211); a plurality of swirl auxiliary wind blades (14) are arranged in the air inlet layer (13); and the swirl auxiliary wind blades (14) are spirally wound and fixed on the outer wall of the constricted portion (211); The swirl auxiliary air bag (11) is located at one end of the conical injection tube (12) close to the injection shell (2), and the swirl auxiliary air bag (11) is sleeved outside the injection shell (2). One end of the swirl auxiliary air bag (11) is sealed and connected to the conical injection tube (12), and the other end is sealed and connected to the injection shell (2); an auxiliary air inlet hole (111) is opened on the swirl auxiliary air bag (11), and the auxiliary air inlet hole (111) is connected to the air supply device through a pipeline.

2. The pneumatic concrete spraying device for a concrete spraying machine according to claim 1, characterized in that: The variable pitch helical blade (32) is fixed to the outer peripheral surface of the shaft body (31) in the injection shell (2), and the pitch of the variable pitch helical blade (32) decreases in a direction approaching the contracting injection port (1).

3. The pneumatic concrete spraying device for a concrete spraying machine according to claim 2, characterized in that: One end of the main air channel (311) away from the main air joint (33) is rotatably connected to an inner spiral blade (34).

4. A pneumatic concrete spraying device for a concrete spraying machine according to any one of claims 1 to 3, characterized in that: The injection housing (2) comprises a front housing (21) and a rear housing (22) which are connected to each other, a quick-release structure (23) is provided between the front housing (21) and the rear housing (22), and the front housing (21) and the rear housing (22) are detachably connected via the quick-release structure (23); The quick-release structure (23) comprises a hoop ring sleeve (231), a front ring piece (233) and a rear ring piece (234); the front ring piece (233) is coaxially fixed to the outer peripheral surface of one end of the front shell (21) close to the rear shell; the rear ring piece (234) is coaxially fixed to the outer peripheral surface of one end of the rear shell (22) close to the front shell (21); the hoop ring sleeve (231) is provided with a notch, and connecting pieces (232) are fixed at both ends of the notch of the hoop ring sleeve (231), and connecting bolts are inserted between the two connecting pieces (232); and a hoop groove for covering the front ring piece (233) and the rear ring piece (234) is provided on the inner side of the hoop ring sleeve (231).

5. The pneumatic concrete spraying device for a concrete spraying machine according to claim 4, characterized in that: The driving member (5) comprises a driving motor (51), a driving sprocket (52), a driven sprocket (53) and a transmission chain (54); the driving motor (51) is mounted on a vehicle body; an output shaft of the driving motor (51) is coaxially fixed with the driving sprocket (52); the driven sprocket (53) is located outside the injection housing (2) and is coaxially fixedly sleeved on the shaft body (31); and the driving sprocket (52) and the driven sprocket (53) are connected via a transmission chain (54).

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