Concrete pneumatic injection device for a concrete spraying machine

Abstract

This invention discloses a pneumatic concrete spraying device for a concrete shotcrete machine, comprising a converging spray nozzle, a spraying shell, a spiral conveying shaft, a supporting bearing seat, and a driving component. The spiral conveying shaft includes a shaft body and variable-pitch spiral blades fixed to the outer wall of the shaft body. The shaft body is a hollow tube with a main air channel formed inside. The main air channel is connected to a main air connector air supply device. The converging spray nozzle includes a swirling auxiliary air bag and a conical spraying cylinder. A constricted section is formed at the end of the spraying shell away from the driving component. An air inlet interlayer is left between the inner wall of the conical spraying cylinder and the outer wall of the constricted section. Swirling auxiliary air blades are arranged in the air inlet interlayer, and the swirling auxiliary air bag is sleeved outside the spraying shell. This invention adopts a pneumatic conveying method that combines main and auxiliary air, enhancing the continuity and uniformity of spraying and keeping the concrete at the spray nozzle in a suspended state, thus reducing the risk of concrete clogging.

Description

Technical Field

[0001] This invention relates to the field of concrete spraying machine technology, and more particularly to a pneumatic concrete spraying device for a concrete spraying machine. Background Technology

[0002] Currently, the most common method for coal mine roadway support is anchor-sprayed support. It uses a concrete spraying machine to spray concrete mixed with a quick-setting agent onto the support surface. After the concrete comes into contact with the surrounding rock, it can form a load-bearing ring with a certain strength in a short time, which plays a role in supporting the roadway.

[0003] The concrete spraying section is a key component of a shotcrete machine. It serves as the outlet for concrete spraying, determining the spraying range and effect, and ensuring that concrete is sprayed onto the target surface. Most existing shotcrete machines use rotor-type or plunger-type pumps to deliver concrete. These pumps have high wear and tear on friction plates or plunger levers, are prone to concrete blockage, and exhibit "pulsating" phenomena during spraying, affecting the spraying effect. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a pneumatic concrete spraying device for a concrete spraying machine, which adopts a pneumatic conveying method that combines main air and auxiliary air to increase the continuity of spraying, reduce uneven concrete spraying, and keep the concrete at the spray nozzle in a suspended state, thus reducing the problem of concrete clogging the pipe.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a pneumatic concrete spraying device for a concrete spraying machine, comprising a shrink spray nozzle, a spraying housing, a spiral conveying shaft, a support bearing seat, and a driving component; the shrink spray nozzle is connected to one end of the spraying housing;

[0006] The spiral conveyor shaft includes a shaft body and variable pitch spiral blades fixed to the outer wall of the shaft body; one end of the shaft body passes through the injection housing and is rotatably connected to the injection housing; the other end of the shaft body passes through the injection housing and passes through the support bearing seat; the support bearing seat is used to provide support for the spiral conveyor shaft; the output end of the drive component is connected to the spiral conveyor shaft and is used to drive the spiral conveyor shaft to rotate.

[0007] One end of the shaft protruding from the spray housing is connected to a main air connector. The shaft is a hollow tube with a main air channel inside. The main air channel is connected to the main air connector, which is connected to an air supply device through a pipe. The air supply device provides compressed air to the spray housing as the main power for concrete spraying.

[0008] The spray direction of the converging nozzle is the same as the conveying direction of the screw conveyor shaft, and the converging nozzle includes a swirl auxiliary air bag and a conical spray cylinder;

[0009] The end of the spray housing away from the drive component has a constricted section. The end of the conical spray cylinder with a relatively large outer diameter is fitted outside the constricted section of the spray housing. An air inlet jacket is left between the inner wall of the conical spray cylinder and the outer wall of the constricted section. Several swirling auxiliary air blades are provided in the air inlet jacket, and the swirling auxiliary air blades are spirally coiled and fixed on the outer wall of the constricted section.

[0010] The swirling auxiliary air bag is located at one end of the conical spray cylinder near the spray housing. The swirling auxiliary air bag is sleeved outside the spray housing. One end of the swirling auxiliary air bag is sealed and fitted to the conical spray cylinder, and the other end is sealed and fitted to the spray housing. An auxiliary air inlet is provided on the swirling auxiliary air bag, and the auxiliary air inlet is connected to the air supply device through a pipe.

[0011] Furthermore, the variable pitch helical blade is fixed to the outer circumferential surface of the shaft inside the injection housing, and the pitch of the variable pitch helical blade decreases in the direction close to the contraction injection port.

[0012] Furthermore, an inner helical blade is rotatably connected to the end of the main air duct away from the main air connector.

[0013] Furthermore, the spray housing includes a front housing and a rear housing connected to each other, and 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 sleeve, a front ring plate, and a rear ring plate. The front ring plate is coaxially fixed to the outer circumferential surface of the front housing near the rear housing. The rear ring plate is coaxially fixed to the outer circumferential surface of the rear housing near the front housing. The hoop sleeve has a notch, and connecting pieces are fixed at both ends of the notch. A connecting bolt passes between the two connecting pieces. A hoop groove is opened on the inner side of the hoop sleeve to cover the front ring plate and the rear ring plate.

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

[0016] The beneficial effects of this invention are:

[0017] This invention discloses a pneumatic concrete spraying device for a concrete spraying machine. It adopts a pneumatic conveying method that combines main air and auxiliary air to increase spraying continuity and reduce uneven concrete spraying. Under the combined action of the main airflow and the auxiliary rotating airflow, the concrete material is guaranteed to have a high initial velocity, resulting in better spraying effect. Furthermore, the auxiliary rotating airflow keeps the concrete at the spray nozzle in a suspended state, making it less likely to cause concrete blockage. Attached Figure Description

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

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

[0020] Figure 3 This is a partial exploded view of the structure of the contraction jet nozzle used in this invention.

[0021] In the diagram: 1. Converging jet nozzle; 11. Swirl auxiliary air bag; 111. Auxiliary air inlet; 12. Conical jet cylinder; 13. Air inlet jacket; 14. Swirl auxiliary air blades; 2. Jet housing; 21. Front housing; 211. Narrow section; 22. Rear housing; 23. Quick-release structure; 231. Hoop sleeve; 232. Connecting piece; 233. Front ring piece; 234. Rear ring piece; 3. Spiral conveyor shaft; 31. Shaft body; 311. Main air duct; 32. Variable pitch spiral blades; 33. Main air connector; 34. Inner spiral blades; 4. Support bearing seat; 5. Drive component; 51. Drive motor; 52. Drive sprocket; 53. Driven sprocket; 54. Transmission chain. Detailed Implementation

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

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

[0024] Reference Figure 1 and Figure 2 A concrete pneumatic spraying device for a concrete spraying machine includes a shrink spray nozzle 1, a spray housing 2, a screw conveyor shaft 3, a support bearing seat 4, and a drive component 5; the shrink spray nozzle 1 is connected to one end of the spray housing 2, and the spray housing 2 is connected to the support bearing seat 4, the drive component 5, and the drive component 5 through the screw conveyor shaft 3.

[0025] Reference Figure 1 and Figure 2The screw conveyor shaft 3 includes a shaft body 31 and variable pitch screw blades 32 fixed to the outer wall of the shaft body 31. One end of the shaft body 31 is located inside the spray housing 2 and rotatably connected to the spray housing 2, while the other end extends out of the spray housing 2. The variable pitch screw blades 32 are fixed to the outer circumferential surface of the shaft body 31 and located inside the spray housing 2. The pitch of the variable pitch screw blades 32 decreases towards the converging spray nozzle 1. Thus, when the screw conveyor shaft 3 is conveying concrete material, the variable pitch screw blades 32 can compact the concrete material to a certain extent, reducing the dispersion and deposition of concrete material at the bottom rear end of the converging spray nozzle 1.

[0026] The support bearing seat 4 is fixed to the vehicle body. The end of the shaft 31 away from the spray housing 2 passes through the support bearing seat 4 and is rotatably connected to the support bearing seat 4. The support bearing seat 4 provides support for the concrete spraying part. The output end of the drive unit 5 is connected to the screw conveyor shaft 3 and is used to drive the screw conveyor shaft 3 to rotate.

[0027] Reference Figure 1 and Figure 2 The driving component 5 includes a drive motor 51, a drive sprocket 52, a driven sprocket 53, and a transmission chain 54. The drive motor 51 is mounted on the vehicle body, and its output shaft is coaxially fixed with the drive sprocket 52. The driven sprocket 53 is located outside the spray housing 2 and coaxially fixedly sleeved on the shaft 31. The drive sprocket 52 and the driven sprocket 53 are connected by the transmission chain 54. The drive motor 51 then drives the drive sprocket 52 to rotate, which in turn drives the driven sprocket 53 to rotate via the transmission chain 54, thereby driving the screw conveyor shaft 3 to rotate and spirally push the material in the spray housing 2.

[0028] Reference Figure 1 and Figure 2 One end of the shaft 31, extending out of the spray housing 2, is rotatably connected to a main air connector 33. The shaft 31 is a hollow tube with a main air channel 311 inside. The main air channel 311 is connected to the main air connector 33, which is connected to an air supply device via a pipe. The air supply device provides compressed air through the main air connector 33 as the main power source for concrete spraying. An inner spiral blade 34 is rotatably connected to the end of the main air channel 311 away from the main air connector 33, giving the main air entering through the main air channel 311 a swirling direction, thus facilitating the spraying of concrete material through the contraction spray nozzle 1.

[0029] Reference Figures 1 to 3The spray direction of the converging nozzle 1 is the same as the conveying direction of the screw conveyor shaft 3. The converging nozzle 1 includes a swirling auxiliary air bag 11 and a conical spray cylinder 12. A constricted portion 211 is formed at the end of the spray housing 2 away from the drive component 5. The end of the conical spray cylinder 12 with a relatively larger outer diameter is fitted over the constricted portion 211 of the spray housing 2. An air inlet jacket 13 is left between the inner wall of the conical spray cylinder 12 and the outer wall of the constricted portion 211. Several swirling auxiliary air blades 14 are arranged in the air inlet jacket 13, and the swirling auxiliary air blades 14 are spirally coiled and fixed on the outer wall of the constricted portion 211. The swirling auxiliary air bag 11 is located at the end of the conical spray cylinder 12 near the spray housing 2. The cross-sectional shape of the swirling auxiliary air bag 11 is U-shaped. The swirling auxiliary air bag 11 is fitted over the spray housing 2. One end of the swirling auxiliary air bag 11 is sealed and fitted to the conical spray cylinder 12, and the other end is sealed and fitted to the spray housing 2. The outer wall of the swirl auxiliary air chamber 11 is provided with an auxiliary air inlet 111, which is connected to the air supply device through a pipe. The auxiliary air enters the swirl auxiliary air chamber 11 through the auxiliary air inlet 111 and then flows into the air inlet jacket 13. Under the guidance of the swirl auxiliary air blades 14, it is sprayed from the inner wall of the conical spray cylinder 12 in a swirling state, forming a rotating air layer on the inner wall of the conical spray cylinder 12. This not only effectively prevents concrete material from sticking to the wall, but also blows up the concrete material scattered at the bottom of the rear end of the shrinkage spray nozzle 1. The ratio of main air to auxiliary air can be adjusted to effectively solve the problems of concrete material clogging the pipe and uneven spraying in the shotcrete machine.

[0030] Reference Figures 1 to 3 The spray housing 2 includes a front housing 21 and a rear housing 22 connected to each other. A quick-release structure 23 is provided between the front housing 21 and the rear housing 22, allowing the front housing 21 and the rear housing 22 to be detachably connected via 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 circumferential surface of the front housing 21 near the rear housing. The rear ring piece 234 is coaxially fixed to the outer circumferential surface of the rear housing 22 near the front housing 21. The hoop sleeve 231 has a notch, and connecting pieces 232 are fixed at both ends of the notch. A connecting bolt passes between the two connecting pieces 232. A hoop groove is provided on the inner side of the hoop sleeve 231 to cover the front ring piece 233 and the rear ring piece 234. When connecting the front housing 21 and the rear housing 22, the hoop sleeve 231 is wrapped around the outside of the front ring piece 233 and the rear ring piece 234 through the hoop groove. Then, the connecting bolts between the two connecting pieces 232 are tightened to tighten and fix the front ring piece 233 and the rear ring piece 234, thus completing the assembly of the spray housing 2. Conversely, the connecting bolts between the two connecting pieces 232 are loosened and removed, so that the front housing 21 and the rear housing 22 of the spray housing 2 can be separated for subsequent maintenance and replacement operations.

[0031] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A pneumatic concrete spraying device for a concrete spraying machine, characterized in that: It includes a shrinking spray nozzle (1), a spray housing (2), a spiral conveyor shaft (3), a support bearing seat (4), and a drive component (5); the shrinking spray nozzle (1) is connected to one end of the spray housing (2); The spiral conveying shaft (3) includes a shaft body (31) and variable pitch spiral blades (32) fixed on the outer wall of the shaft body (31); one end of the shaft body (31) passes through the spray housing (2) and is rotatably connected to the spray housing (2); the other end of the shaft body (31) passes through the spray housing (2) and passes through the support bearing seat (4); the support bearing seat (4) is used to provide support for the spiral conveying shaft (3); the output end of the drive component (5) is connected to the spiral conveying shaft (3) and is used to drive the spiral conveying shaft (3) to rotate; One end of the shaft (31) that protrudes from the spray housing (2) is connected to a main air connector (33). The shaft (31) is a hollow tube with a main air channel (311) inside. The main air channel (311) is connected to the main air connector (33), which is connected to an air supply device through a pipe. The air supply device provides compressed air to the spray housing (2) as the main power for concrete spraying. The spraying direction of the contraction nozzle (1) is the same as the conveying direction of the screw conveyor shaft (3). The contraction nozzle (1) includes a swirl auxiliary air bag (11) and a conical spray cylinder (12). The spray housing (2) has a constriction section (211) at the end away from the drive member (5). The end of the conical spray cylinder (12) with a relatively large outer diameter is fitted outside the constriction section (211) of the spray housing (2). An air inlet jacket (13) is left between the inner wall of the conical spray cylinder (12) and the outer wall of the constriction section (211). Several swirling auxiliary air blades (14) are provided in the air inlet jacket (13), and the swirling auxiliary air blades (14) are spirally coiled and fixed on the outer wall of the constriction section (211). The swirling auxiliary air bag (11) is located at one end of the conical spray cylinder (12) near the spray housing (2). The swirling auxiliary air bag (11) is sleeved on the outside of the spray housing (2). One end of the swirling auxiliary air bag (11) is sealed and fitted to the conical spray cylinder (12), and the other end is sealed and fitted to the spray housing (2). An auxiliary air inlet hole (111) is provided on the swirling auxiliary air bag (11). The auxiliary air inlet hole (111) is connected to the air supply device through a pipe.

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 on the outer circumferential surface of the shaft (31) inside the injection housing (2), and the pitch of the variable pitch helical blade (32) decreases in the direction close to the contraction injection port (1).

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

4. A pneumatic concrete spraying device for a concrete spraying machine according to any one of claims 1-3, characterized in that: The spray housing (2) includes a front housing (21) and a rear housing (22) 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 by the quick-release structure (23). The quick-release structure (23) includes a hoop sleeve (231), a front end ring (233), and a rear end ring (234). The front end ring (233) is coaxially fixed to the outer circumferential surface of the front end housing (21) near the rear end housing. The rear end ring (234) is coaxially fixed to the outer circumferential surface of the rear end housing (22) near the front end housing (21). The hoop sleeve (231) has a notch, and connecting pieces (232) are fixed at both ends of the notch. A connecting bolt passes between the two connecting pieces (232). The inner side of the hoop sleeve (231) has a hoop groove for covering the front end ring (233) and the rear end ring (234).

5. A pneumatic concrete spraying device for a concrete spraying machine according to claim 4, characterized in that: The drive unit (5) includes a drive motor (51), a drive sprocket (52), a driven sprocket (53), and a transmission chain (54). The drive motor (51) is mounted on the vehicle body. The output shaft of the drive motor (51) is coaxially fixed with the drive sprocket (52). The driven sprocket (53) is located outside the injection housing (2) and coaxially fixed on the shaft body (31). The drive sprocket (52) and the driven sprocket (53) are connected by the transmission chain (54).

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