Cone valve type pneumatic concrete sprayer

Abstract

The utility model relates to the field of anchor shotcrete support, in particular to a cone valve type pneumatic shotcrete machine which comprises a discharging cavity with a discharging port at one end, a feeding cavity is communicated with the upper end of the discharging cavity, a lower cone valve for controlling the discharging cavity and the feeding cavity to be communicated or closed is arranged at the communicated position of the discharging cavity and the feeding cavity, a compressed air inlet hole is formed in the discharging cavity, and a compressed air outlet hole is formed in the feeding cavity. The feeding cavity is provided with a negative pressure air hole and a pressure relief air hole, the upper end of the feeding cavity extends to form a feeding port, the upper end of the feeding port is provided with an upper cone valve for controlling the feeding port to be opened or closed, the lower cone valve and the upper cone valve are each of a big-end-down cone structure, and when the lower cone valve and the upper cone valve are closed, sealing rings are arranged at the corresponding abutting positions. The feeding cavity and the discharging cavity which are closed independently are adopted, so that the environmental dust concentration is greatly reduced during operation.

Description

Technical Field

[0001] The utility model relates to the field of shotcrete support, and more specifically to a cone valve type pneumatic concrete spraying machine. Background Technique

[0002] At present, the well-known shotcrete support needs to use a spraying machine to complete the spraying of concrete. The spraying machines are divided into dry type, wet type and semi-wet type. Currently, the rotor type concrete spraying machine is generally adopted, which is dry type or semi-wet type and complies with the coal industry standard MT / T 547-2006. It uses a rotating device to drive the material chamber to rotate for feeding. The sealing depends on the combined plate pressing the rotating liner. The residual air overflows from the joint surface, generating dust. When the joint surface of the combined plate and the liner wears, the dust increases. Generally, increasing the water content of the aggregate is adopted to reduce the dust concentration, which easily causes an increase in the viscosity of the concrete. The viscous concrete will adhere to somewhere on the equipment or pipeline, and excessive accumulation will cause blockage. The most important reason for dust generation is the loose sealing due to the wear of the combined plate and the rotating liner. In serious cases, the dust fills the entire space, and the operator must wear labor protection supplies, risking silicosis. This is the biggest drawback of the rotor type concrete spraying machine. In response to this defect, Article 653 of the "Coal Mine Safety Regulations" 2022 version clearly stipulates that: "When spraying concrete, the semi-wet spraying or wet spraying process shall be adopted, and a dust removal device shall be equipped to remove dust from the feeding port and the residual air port. Within 100m of the downwind of the spraying operation point, a water curtain for purifying the air flow shall be set up." During operation, the dust removal device needs to move together with the spraying machine. Due to the large size and difficult movement of the dust removal device, many coal mines do not adopt it. Content of the Utility Model

[0003] The utility model provides a cone valve type pneumatic concrete spraying machine, which adopts an independent and closed feeding chamber and discharging chamber, greatly reducing the environmental dust concentration during operation.

[0004] The technical solution adopted by the utility model to solve the above problems is as follows:

[0005] A cone valve type pneumatic concrete spraying machine includes a discharging chamber with a discharging port at one end. The upper end of the discharging chamber is communicated with a feeding chamber. A lower cone valve for controlling the communication or closing of the two is arranged at the communication position between the discharging chamber and the feeding chamber. A compressed air inlet hole is arranged on the discharging chamber, and a negative pressure air hole is arranged on the feeding chamber. The upper end of the feeding chamber extends to form a feeding port, and an upper cone valve for controlling the opening or closing of the feeding port is arranged at the upper end of the feeding port. Both the lower cone valve and the upper cone valve are cone structures with a smaller upper part and a larger lower part. When closed, sealing rings are arranged at the corresponding tightening positions.

[0006] A pressure relief air hole is arranged on the feeding chamber for relieving pressure before the feeding chamber is opened.

[0007] The negative pressure air hole is arranged above the feeding chamber.

[0008] The pressure relief air hole is arranged above the feed chamber.

[0009] A lower cone valve cylinder is installed on the discharge chamber to control the opening or closing of the lower cone valve.

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

[0011] A rotating material conveying screw is arranged in the discharge chamber for conveying materials to the discharge port.

[0012] A pneumatic motor is installed outside the discharge chamber for driving the material conveying screw to rotate.

[0013] The upper end of the middle part of the discharge chamber is communicated with the feed chamber, and the communication part is located directly above the material conveying screw.

[0014] The compressed air inlet hole is located at the end far from the discharge port.

[0015] Advantages of the present application:

[0016] An independent and enclosed feed chamber and discharge chamber are adopted. When feeding, the discharge chamber is closed and the feed chamber is opened. At the same time, a negative pressure is formed in the feed chamber through the negative pressure air hole, and the surrounding dust will be sucked into the chamber without generating dust. After the feed chamber is closed, the discharge chamber is opened, and the concrete material enters the discharge chamber. The concrete material is conveyed into the spraying pipeline through the material conveying screw and compressed gas. After the discharge chamber is closed, the compressed gas stored in the feed chamber is released through the pressure relief air hole, and the negative pressure air hole starts to work. Then the feed chamber is opened, and the feeding and discharging processes are cycled in turn. Description of the drawings

[0017] Figure 1 It is a schematic structural diagram of a cone valve type pneumatic concrete spraying machine;

[0018] In the figure:

[0019] 1 - upper cone valve cylinder, 2 - sealing ring, 3 - upper cone valve, 4 - feed port, 5 - feed chamber, 6 - pressure relief air hole, 7 - lower cone valve cylinder, 8 - discharge chamber, 9 - compressed air inlet hole, 10 - pneumatic motor, 11 - material conveying screw, 12 - discharge port, 13 - lower cone valve, 14 - negative pressure air hole. Specific embodiments

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] The following combinationFigure 1 Describe a conical valve type pneumatic concrete spraying machine:

[0022] This conical valve type pneumatic concrete spraying machine mainly consists of a feeding chamber 5, a sealing ring 2, an upper conical valve 3, an upper conical valve cylinder 1, a pressure relief air hole 6, a negative pressure air hole 14, a discharging chamber 8, a lower conical valve 13, a lower conical valve cylinder 7, a compressed air inlet hole 9, a pneumatic motor 10 and a feeding screw 11.

[0023] The upper conical valve cylinder 1 drives the upper conical valve 3 to move up and down to open or close the feeding port 4 of the feeding chamber 5. The feeding port 4 of the feeding chamber 5 can be sealed by the upper conical valve 3 and the sealing ring 2. When feeding, after the upper conical valve 3 is opened, the negative pressure air hole 14 is opened simultaneously. The concrete material enters the feeding chamber through the feeding port 4. At this time, the feeding chamber 5 generates negative pressure through the negative pressure air hole 14 simultaneously, sucking the dust generated during the dumping process into the chamber to avoid the dust floating out from the feeding port 4.

[0024] After the feeding is completed, after the upper conical valve 3 is closed, the negative pressure air hole 14 is closed, and the lower conical valve 13 is opened by the lower conical valve cylinder 7. The concrete material enters the discharging chamber 8 by its own weight. The pneumatic motor 10 drives the feeding screw 11 to rotate, and the compressed air enters the discharging chamber 8 through the compressed air inlet hole 9. The concrete material is evenly transported to the discharging port 12 and sprayed out through the feeding screw 11 and the compressed air.

[0025] After the lower conical valve 13 is closed, the pressure relief air hole 6 is opened to discharge the high-pressure gas in the feeding chamber 5. Then the negative pressure air hole 14 and the upper conical valve 3 are opened successively, and the feeding and discharging processes are cycled in turn.

[0026] This conical valve type pneumatic concrete spraying machine belongs to dry spraying, with simple operation and high efficiency. It is connected to a dust removal device through the negative pressure air hole 14 and the pressure relief air hole 6, and the dust is cleaned by the dust removal device, which greatly reduces the environmental dust concentration. The dust removal device is a product that can be purchased on the market and can capture fine dust with a particle size less than 5 microns, with a high dust removal efficiency of over 98%, meeting the requirements of the coal mine safety regulations for dust prevention and eliminating the harm of dust to people and the environment.

[0027] Compared with the rotor type spraying machine using dynamic seals, this conical valve type pneumatic concrete spraying machine uses static seals, with good sealing effect and not easy to leak. The concrete material is in bags and is evenly mixed on the ground in a dry state. Only 2 people are needed to complete the task during the operation of the spraying machine, 1 person to deliver the material and 1 person to feed the material. The whole machine is powered by compressed air and does not require electricity, improving the safety of the equipment in coal mines. The equipment is light, easy to move, runs stably and is simple to maintain.

[0028] Certainly, the above description is not a limitation to this user manual, nor is the present utility model limited to the above examples. Changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present utility model also fall within the protection scope of the present utility model.

Claims

1. A cone valve type pneumatic concrete spraying machine, characterized in that: The invention comprises a discharge chamber (8) with a discharge port (12) at one end, the upper end of the discharge chamber (8) is connected with a feed chamber (5), a lower cone valve (13) is provided at the connection point between the discharge chamber (8) and the feed chamber (5) for controlling the connection or closing of the two, a compressed air inlet hole (9) is provided on the discharge chamber (8), a negative pressure air hole (14) is provided on the feed chamber (5), a feed port (4) extends from the upper end of the feed chamber (5), an upper cone valve (3) is provided at the upper end of the feed port (4) for controlling the opening or closing of the feed port (4), the lower cone valve (13) and the upper cone valve (3) are both cone structures with a small upper part and a large lower part, and when closed, sealing rings (2) are provided at the corresponding tightening positions.

2. A cone valve type pneumatic concrete spraying machine according to claim 1, characterized in that: The feed chamber (5) is provided with a pressure relief hole (6) for relieving pressure before the feed chamber (5) is opened.

3. A cone valve type pneumatic concrete spraying machine according to claim 2, characterized in that: The negative pressure air hole (14) is arranged above the feed cavity (5).

4. A cone valve type pneumatic concrete spraying machine according to claim 2, characterized in that: The pressure relief hole (6) is arranged above the feed cavity (5).

5. The cone valve type pneumatic concrete spraying machine according to claim 1, 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).

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

7. The cone valve type pneumatic concrete spraying machine according to claim 1, characterized in that: A rotating conveying screw (11) is provided in the discharge cavity (8) for conveying materials to the discharge port (12).

8. A cone valve type pneumatic concrete spraying machine according to claim 7, 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 7, characterized in that: The middle upper end of the discharge chamber (8) is connected to the feed chamber (5), and the connection point is located directly above the feed screw (11).

10. The cone valve type pneumatic concrete spraying machine according to claim 8, characterized in that: The compressed air inlet hole (9) is located at the end far away from the discharge port (12).

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