Cone valve type pneumatic concrete sprayer

Abstract

The invention relates to the field of anchor shotcrete supporting, in particular to a cone valve type pneumatic concrete sprayer which comprises a feeding cavity with a feeding port formed in the upper end, the lower end of the feeding cavity is communicated with a discharging cavity, a lower cone valve for controlling the feeding cavity and the discharging cavity to be communicated or closed is arranged at the communicating position of the feeding cavity and the discharging cavity, and a discharging port is formed in the side end of the discharging cavity. A discharging cavity is formed in the feeding cavity, a conveying screw used for conveying materials to the discharging port is rotationally arranged in the discharging cavity, a negative pressure air hole is formed in the feeding cavity, negative pressure is generated in the feeding cavity, dust is prevented from flying out, and a discharging cavity compression air hole is formed in the discharging cavity and used for conveying compressed air to the discharging cavity. And the compressed air can uniformly spray the mixture at the discharge hole to the spraying pipeline. During feeding, negative pressure is formed in the feeding cavity through the negative pressure air holes, surrounding dust can be sucked into the cavity, and the dust concentration is greatly reduced.

Description

Technical Field

[0001] The invention relates to the field of anchor spraying support, and more specifically to a cone valve type pneumatic concrete spraying machine. Background Art

[0002] At present, the known anchor spraying support needs to use a sprayer to complete the spraying of concrete. The sprayer is divided into dry type, tidal type and wet type. The rotor concrete sprayer is now commonly used, which is dry or tidal type. It implements the coal industry standard MT / T 547-2006, uses a rotating device to drive the material chamber to rotate and feed, and the seal relies on the combination plate to press the rotating liner. The residual air overflows from the combination surface. When the combination plate and the liner combination surface are worn, the dust will gradually increase. Generally, increasing the moisture content of the aggregate is used to reduce the dust concentration, which is easy to cause the viscosity of the mixture to increase. The mixture with high viscosity will adhere to the equipment or pipeline somewhere, and excessive accumulation will cause blockage. The biggest cause of dust is the poor sealing after the combination plate and the rotating liner are worn. In severe cases, the dust fills the entire space. During on-site operations, the operator manually adds sand, gravel, cement and accelerator to the sprayer. The proportion of the mixture is difficult to control, and the quality of the concrete cannot be guaranteed. Cement and accelerator are prone to dust. The dust removal device needs to be moved with the sprayer during operation. Because the dust removal device is large and not easy to move, it has not been promoted and used underground in coal mines. In short, the operator must wear labor protection equipment, and there is a risk of silicosis, which is the biggest disadvantage of the rotor concrete sprayer. In response to this defect, Article 653 of the 2022 version of the "Coal Mine Safety Regulations" clearly stipulates: "When spraying concrete, a tidal spraying or wet spraying process should be used, and a dust removal device should be equipped to remove dust from the feed port and residual air port. A wind flow purification water curtain should be set within 100m of the wind flow down the spraying operation point." Wet spraying technology is a way to reduce dust concentration, but wet concrete sprayers are large in size, heavy in weight, complex in structure, and require a large number of operators. They are not easy to move, and the equipment is not easy to place when mixing materials on site, especially when the anchor spraying well is up and down the mountain. Wet concrete spraying machines have strict requirements on the workability of concrete. When the moisture content is high, it is easy to flow when sprayed onto the working surface. When the moisture content is low, the concrete is easy to clog equipment and pipes. After the work is completed, the workload of cleaning the equipment and pipes is large. Once the pipe is blocked during operation, it is difficult to clear it. At present, the technology of wet concrete spraying machines is not mature and has not been promoted for use in underground coal mines. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a cone valve type pneumatic concrete spraying machine.

[0004] The technical solution adopted by the present invention to solve the above problems is:

[0005] A cone valve type pneumatic concrete spraying machine comprises a feed chamber with a feed port at the upper end, a discharge chamber connected at the lower end of the feed chamber, and a lower cone valve for controlling the connection or closing of the feed chamber and the discharge chamber is provided at the connection point between the two, a discharge port is provided at the side end of the discharge chamber, and a feeding screw for conveying materials to the discharge port is rotated in the discharge chamber, a negative pressure air hole is provided on the feed chamber to generate negative pressure in the feed chamber to prevent dust from floating out, and a discharge chamber compression air hole is provided on the discharge chamber to convey compressed air to the discharge chamber, and the compressed air can evenly spray the mixed material at the discharge port to the spraying pipeline.

[0006] Furthermore, an upper cone valve for controlling the opening or closing of the feed port is provided at the upper end of the feed chamber.

[0007] Furthermore, the upper cone valve and the lower cone valve are both cone structures with a small top and a large bottom, and sealing rings are provided at corresponding tightening positions when closed.

[0008] Furthermore, the feed chamber is provided with a pressure relief hole for discharging compressed gas before the feed chamber is opened.

[0009] Furthermore, a feed chamber compression air hole is provided on the feed chamber, which is used to inject compressed gas into the feed chamber before the lower cone valve is opened.

[0010] Furthermore, an upper cone valve cylinder is installed on the feed chamber to control the opening or closing of the upper cone valve.

[0011] Furthermore, a lower cone valve cylinder is installed on the discharge chamber to control the opening or closing of the lower cone valve.

[0012] Furthermore, a pneumatic motor is installed outside the discharge cavity to drive the feed screw to rotate.

[0013] Furthermore, the negative pressure pores are arranged above the feed cavity to ensure that the negative pressure pores are unobstructed.

[0014] Furthermore, the pressure relief vent is arranged above the feed cavity to ensure that the pressure relief vent is unobstructed.

[0015] Beneficial effects of this application:

[0016] 1. Independently closed feeding chamber and discharging chamber are adopted. When feeding, the discharging chamber is closed and the feeding chamber is opened. At the same time, negative pressure is formed in the feeding chamber through the negative pressure pores, and the surrounding dust will be sucked into the chamber; after the feeding chamber is closed, the compression pores of the feeding chamber inject compressed gas into the feeding chamber, and then the discharging chamber is opened, and the mixed material enters the discharging chamber, and the mixed material is transported to the injection pipe through the feeding screw and compressed gas. After the discharging chamber is closed, the compressed gas in the feeding chamber is discharged through the pressure relief pores, and then the negative pressure pores start to work, and then the feeding chamber is opened, and the feeding and discharging process is circulated in sequence. The negative pressure pores and the pressure relief pores are directly connected to the matching dust removal device, and the dust concentration is greatly reduced during the operation.

[0017] 2. The overall structure is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a cone valve type pneumatic concrete spraying machine;

[0019] In the figure:

[0020] 1-upper cone valve cylinder; 2-sealing ring; 3-upper cone valve; 4-feeding port, 5-feeding chamber; 6-pressure relief hole; 7-lower cone valve cylinder; 8-discharging chamber; 9-discharging chamber compression hole; 10-pneumatic motor; 11-feeding screw; 12-discharging port; 13-lower cone valve; 14-negative pressure hole; 15-feeding chamber compression hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Combine the following Figure 1 Description of a cone valve type pneumatic concrete spraying machine:

[0023] The cone valve type pneumatic concrete spraying machine is mainly composed of a feed chamber 5, a sealing ring 2, an upper cone valve 3, an upper cone valve cylinder 1, a pressure relief hole 6, a negative pressure hole 14, a feed chamber compression hole 15, a discharge chamber 8, a lower cone valve 13, a lower cone valve cylinder 7, a discharge chamber compression hole 9, a pneumatic motor 10 and a feeding screw 11.

[0024] The upper cone valve cylinder 1 drives the upper cone valve 3 to move up and down, opening or closing the feed port 4 of the feed chamber 5. The feed port 4 of the feed chamber 5 can be sealed by the upper cone valve 3 and the sealing ring 2. When feeding, the negative pressure pore 14 is already opened before the upper cone valve 3 is opened, and the mixed material enters the feed chamber 5 through the feed port 4. At this time, the feed chamber 5 generates negative pressure through the negative pressure pore 14, sucking the dust generated during feeding into the chamber to prevent the dust from floating out of the feed port 4;

[0025] After the feeding is completed, the negative pressure air hole 14 is closed after the upper cone valve 3 is closed, and the compression air hole 15 of the feeding chamber injects compressed gas into the feeding chamber 5. The lower cone valve 13 is opened through the lower cone valve cylinder 7, and the mixed material enters the discharge chamber 8. The pneumatic motor 10 drives the feeding screw 11 to rotate to transport the mixed material to the discharge port 12. The compressed air enters the discharge chamber 8 through the compression air hole 9 of the discharge chamber, and the compressed air sprays the mixed material at the discharge port 12 evenly toward the spraying pipe.

[0026] After the lower cone valve 13 is closed, the pressure relief vent 6 is opened to discharge the compressed gas in the feed chamber 5, and then the negative pressure vent 14 and the upper cone valve 3 are opened successively, and the feeding and discharging processes are circulated in sequence.

[0027] The cone valve pneumatic concrete spraying machine belongs to dry spraying, which is simple to operate and highly efficient. The negative pressure air hole 14 and the pressure relief air hole 6 are connected to a dust removal device, through which the dust is cleaned, thus greatly reducing the environmental dust concentration; the dust removal device is a product capable of capturing fine dust with a particle size of less than 5 microns, and the dust removal efficiency can reach more than 98%, which fully meets the dust prevention and control requirements of the "Coal Mine Safety Regulations" and eliminates the harm of dust to people and the environment.

[0028] Compared with the rotor type spraying machine which uses dynamic seal, this cone valve type pneumatic concrete spraying machine uses static seal, which has good sealing effect and is not easy to leak dust. The mixed material is bagged and mixed evenly on the ground. When the spraying machine is in operation, only 3 people are needed to complete the work task, 1 person to transfer the material, 1 person to feed the material, and 1 person to spray. The whole machine is powered by compressed air and does not require power supply, which improves the safety of underground equipment in coal mines. The equipment is light, easy to move, stable in operation, and simple to maintain.

[0029] Of course, the above description is not a limitation of the instructions for use, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention also fall within the scope of protection of the present invention.

Claims

1. A cone valve type pneumatic concrete spraying machine, characterized in that: The invention comprises a feed chamber (5) with a feed port (4) at the upper end, a discharge chamber (8) connected to the lower end of the feed chamber (5), and a lower cone valve (13) for controlling the connection or closing of the feed chamber (5) and the discharge chamber (8) at the connection point between the feed chamber (5) and the discharge chamber (8), a discharge port (12) being provided at the side end of the discharge chamber (8), and a feeding screw (11) for conveying materials to the discharge port (12) rotating in the discharge chamber (8), a negative pressure air hole (14) being provided on the feed chamber (5) to generate negative pressure in the feed chamber (5) to prevent dust from floating out, and a discharge chamber compression air hole (9) being provided on the discharge chamber (8) to convey compressed air to the discharge chamber (8), and the compressed air can evenly spray the mixed material at the discharge port (12) toward the spraying pipeline.

2. A cone valve type pneumatic concrete spraying machine according to claim 1, characterized in that: An upper cone valve (3) for controlling the opening or closing of the feed port (4) is provided at the upper end of the feed chamber (5).

3. A cone valve type pneumatic concrete spraying machine according to claim 2, characterized in that: The upper cone valve (3) and the lower cone valve (13) are both cone structures with a small top and a large bottom, and sealing rings (2) are provided at corresponding tightening positions when closed.

4. A cone valve type pneumatic concrete spraying machine according to claim 3, characterized in that: The feed chamber (5) is provided with a pressure relief hole (6) for discharging compressed gas before the feed chamber (5) is opened.

5. A cone valve type pneumatic concrete spraying machine according to claim 4, characterized in that: The feed chamber (5) is provided with a feed chamber compression air hole (15) for injecting compressed gas into the feed chamber (5) before the lower cone valve (13) is opened.

6. The cone valve type pneumatic concrete spraying machine according to claim 2, characterized in that: An upper cone valve cylinder (1) is installed on the feed chamber (5) and is used to control the opening or closing of the upper cone valve (3).

7. The cone valve type pneumatic concrete spraying machine according to claim 2, characterized in that: The discharge chamber (8) is provided with a lower cone valve cylinder (7) for controlling the opening or closing of the lower cone valve (13).

8. The cone valve type pneumatic concrete spraying machine according to claim 1, characterized in that: A pneumatic motor (10) is installed outside the discharge chamber (8) to drive the feed screw (11) to rotate.

9. The cone valve type pneumatic concrete spraying machine according to claim 1, characterized in that: The negative pressure pore (14) is arranged above the feed cavity (5) to ensure that the negative pressure pore (14) is unobstructed.

10. The cone valve type pneumatic concrete spraying machine according to claim 1, characterized in that: The pressure relief hole (6) is arranged above the feed cavity (5) to ensure that the pressure relief hole (6) is unobstructed.

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