A stone powder conveying device and a stone powder conveying method

Abstract

The application discloses a kind of stone powder conveying device and stone powder conveying method, including tank, feed pipe, air inlet pipe, discharge pipe, conveying pipe and exhaust pipe, fluidizing device and receiving port are arranged inside the tank, the fluidizing device is located at the bottom of the tank, the receiving port is connected with the discharge pipe, the fluidizing device and the receiving port are located on the same vertical line, the fluidizing device is located below the receiving port, the outlet of the discharge pipe is connected with the conveying pipe;Blowing pipe (6) is also provided at the connection of the discharge pipe and the conveying pipe.The application has the advantages of large tank volume, large single conveying capacity, avoids material leakage affecting the environment, high conveying efficiency, etc.

Description

Technical Field

[0001] This invention belongs to the field of closed pneumatic conveying technology for powder materials, specifically relating to a stone powder conveying device and a stone powder conveying method. Background Technology

[0002] Closed pneumatic conveying technology uses closed pipelines as the conveying tool to replace traditional mechanical (belt belts, vehicles) material transport. It offers advantages such as high conveying efficiency, small footprint, economy, and, most importantly, no pollution, making it suitable for conveying powdery materials. Therefore, closed pneumatic conveying technology is widely used in energy, chemical, metallurgical, and building materials industries.

[0003] In existing closed pneumatic conveying devices, including imported CP-type silo pumps and domestically produced CB-type silo pumps, the storage tanks used are conical or have a conical bottom, with the discharge port located outside the cone of the silo pump and connected to the conveying pipe. Chinese patent CN10475098B discloses a high-temperature flue gas positive pressure conveying process and its dedicated equipment, using a vertical conveying pump silo that is conical in shape with a discharge port at the bottom, and a blown gas outlet at the bottom outlet for conveying high-temperature flue gas. Chinese patent CN216511475U discloses a pressure conveying tank system for long-distance powder conveyors, using a pressure conveying tank body that is also conical in structure with a discharge port at the bottom. Existing technologies use conical silo pump structures, utilizing the natural weight of the material to sink downwards, which is beneficial for material conveying. However, this type of silo pump is generally small in size, has a small single conveying capacity, requires frequent operation, and places extremely high demands on the airtightness of all connections, resulting in a high failure rate and potential environmental pollution. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a stone powder conveying device and a stone powder conveying method, suitable for conveying powder materials in building materials engineering, pumping chambers with large volumes, and single conveying capacities.

[0005] The technical solution of the present invention is as follows:

[0006] A stone powder conveying device includes a material tank, a feed pipe, an air inlet pipe, a discharge pipe, a conveying pipe, and an exhaust pipe. A fluidizing device and a receiving port are provided inside the material tank. The fluidizing device is located at the bottom of the material tank, and the receiving port is connected to the discharge pipe. The fluidizing device and the receiving port are located on the same vertical line, and the fluidizing device is located below the receiving port.

[0007] Furthermore, the receiving port is funnel-shaped with the wider opening facing downwards, and the top opening is connected to the discharge pipe.

[0008] Furthermore, the fluidization device includes a fluidizing duct, a fluidizing bowl, and a support. The fluidizing bowl has its opening facing upwards, and the fluidizing duct is inserted into the fluidizing bowl. The fluidizing duct and the fluidizing bowl are fixed by the support, and the distance between the fluidizing duct and the bottom surface of the fluidizing bowl is 5-20 mm.

[0009] Furthermore, the distance between the top surface of the fluidizing device and the bottom surface of the receiving port is 250–600 mm.

[0010] Furthermore, the discharge pipe is connected to the conveying pipe and is provided with a blowing aid pipe; the blowing aid pipe is coaxially connected to the conveying pipe, and the end of the blowing aid pipe is a shrinkage pipe, which is inserted into the conveying pipe. The shrinkage pipe gradually narrows along the diameter of the conveying pipe, and the end of the shrinkage pipe is located behind the center line of the connection between the discharge pipe and the conveying pipe; the angle between the discharge pipe and the blowing aid pipe is R, where 30°≤R≤60°.

[0011] Furthermore, material gathering devices are installed at both ends of the material tank. The material gathering devices are connected to the external air supply pipe. The material gathering devices are arc-shaped material gathering pipes. The material gathering pipes are concentric with the cylindrical wall of the material tank. The arc of the arc-shaped material gathering pipes is 20° to 30°. Material gathering air holes are provided on the material gathering pipes. The openings of the material gathering air holes face inward and are parallel to the inner wall of the material tank.

[0012] The stone powder conveying device provided by this invention features a fluidizing device and a receiving port inside a storage tank. The fluidizing device is located at the bottom of the tank, while the receiving port is positioned above it, both aligned vertically. The receiving port is connected to a discharge pipe. In this way, stone powder within the tank enters the discharge pipe and then the conveying pipe through fluidization and positive pressure, thus achieving stone powder conveying. Since the core conveying components—the fluidizing device and the receiving port—are located inside the storage tank, only a sealed connection between the air inlet pipe, the feed pipe, the discharge pipe, and the storage tank is required. There are no strict sealing requirements for the connection between the fluidizing device and the air inlet pipe, or the connection between the receiving port and the discharge pipe. Even if leakage occurs, it will not cause environmental pollution. A conventional storage tank can be used, even a large-volume one. The tank structure is not critical, making it easy to manufacture, and the connection between the tank and the connecting pipes is easily sealed.

[0013] The present invention also provides a method for conveying stone powder, comprising the following steps:

[0014] Add material by closing the valves on the discharge pipe and the air inlet pipe, opening the valve on the exhaust pipe, and opening the valve on the feed pipe to add stone powder into the hopper.

[0015] After pressurization and feeding are completed, close the valves on the feed pipe and the exhaust pipe, and then open the valves on the fluidizing air pipe and the air inlet pipe in sequence to introduce compressed gas into the tank.

[0016] During conveying, once the pressure inside the material tank reaches the set pressure requirement, the valve on the blowing pipe is opened first, followed by the valve on the discharge pipe. The stone powder enters the discharge pipe from the receiving port under the fluidization of the fluidizing device and the pressure of the material tank. Driven by the blowing air in the blowing pipe, the stone powder enters the conveying pipe from the discharge pipe.

[0017] Furthermore, the pressure of the compressed gas is 0.25 to 0.3 MPa, and the set pressure is 0.25 MPa.

[0018] Furthermore, in the conveying step, the valve on the blowing tube is opened for 20 seconds before the valve on the discharge tube is opened.

[0019] Furthermore, when the pressure inside the material tank reaches 0.05 to 0.07 MPa, it indicates that the conveying process is complete. After the conveying process is completed, when the pressure inside the material tank is 0 to 0.02 MPa, the valve on the air inlet pipe is closed, the valve on the feed pipe is opened, and the valve on the discharge pipe is closed after 50 seconds.

[0020] The stone powder conveying method provided by this invention completes the loading, pressurization of the tank, and conveying of stone powder. During the pressurization stage, a pressure of 0.25 MPa is used, and during the conveying stage, the pressure inside the tank is maintained at 0.2 MPa. This method can convey 10 tons of stone powder within 6 minutes, with a single pumping cycle taking only 10 minutes. This invention exhibits high conveying efficiency even under low-pressure conveying conditions.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] The material tank has a large volume and a large single conveying capacity;

[0023] The fluidization device and receiving port for conveying are located inside the tank to prevent material leakage from affecting the environment;

[0024] The conveying pressure is 0.25-0.5MPa, and it can complete the conveying of 10 tons or more of materials in 10 minutes, with high conveying efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the stone powder conveying device of the present invention.

[0027] Figure 2 This is a schematic diagram of another tank-type stone powder conveying device of the present invention.

[0028] Figure 3 This is a partially enlarged view of the blowpipe connection of the stone powder conveying device of the present invention.

[0029] Figure 4 This is a schematic diagram of the fluidization device and the receiving port of the present invention.

[0030] Figure 5 This is a schematic diagram of the fluidization device of the present invention.

[0031] Figure 6 This is a schematic diagram of the material gathering device of the present invention.

[0032] Among them, 1. material tank, 2. feed pipe, 3. air inlet pipe, 4. discharge pipe, 5. conveying pipe, 6. blowing aid pipe, 7. exhaust pipe, 8. fluidization device, 9. receiving port, 10. material gathering device, 61. shrink pipe, 81. fluidization air pipe, 82. fluidization bowl, 83. support, 101. material gathering pipe, 102. material gathering air hole. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] This invention provides a stone powder conveying device and a stone powder conveying method, which have the advantages of large tank volume, large single conveying capacity, fluidization device for conveying and receiving port set inside the tank to avoid material leakage and environmental impact, and high conveying efficiency.

[0035] refer to Figure 1 and Figure 2As shown in the figure, an embodiment of the present invention provides a stone powder conveying device, which includes a feed pipe 2, an air inlet pipe 3, a discharge pipe 4, and an exhaust pipe 7 on a material tank 1. The feed pipe 2 is located at the top center of the material tank 1, while the air inlet pipe 3 and the exhaust pipe 7 are located on one side of the top of the material tank 1. The feed pipe 2, air inlet pipe 3, discharge pipe 4, and exhaust pipe 7 are connected to the material tank 1 by welding or flange connection. In practice, welding is generally used to improve the firmness and airtightness. Control valves and pressure gauges are installed on the connecting pipes of the material tank 1 to the feed pipe 2, air inlet pipe 3, discharge pipe 4, and exhaust pipe 7.

[0036] A fluidizing device 8 and a receiving port 9 are installed inside the material tank 1. The fluidizing device 8 is located at the bottom center of the material tank 1 and is welded to the inner wall of the material tank 1. The receiving port 9 is connected to one end of the discharge pipe 4. The fluidizing device 8 and the receiving port 9 are located on the same vertical line, with the fluidizing device 8 located below the receiving port 9. To ensure that the stone powder can enter the space between the fluidizing device 8 and the receiving port 9, the distance between the top surface of the fluidizing device 8 and the bottom surface of the receiving port 9 is 250-600 mm. The outlet of the discharge pipe 4 is connected to the conveying pipe 5; an auxiliary blowing pipe 6 is also connected at the connection between the discharge pipe 4 and the conveying pipe 5.

[0037] In this embodiment of the invention, the stone powder is a powder or particulate matter obtained by pulverizing or semi-pulverizing a material mainly composed of silicon dioxide, calcium oxide, or both. More often, it refers to pulverized powder particles containing both silicon dioxide and calcium oxide, with a density of 1–1.5 g / cm³. 3 Stone powder particles are generally 5mm or smaller; larger particles cannot be effectively conveyed due to gravity. In the building materials industry, the particle size of powdery materials being conveyed generally does not exceed 5mm.

[0038] In this invention, the material tank 1 is a horizontal or vertical pressure-resistant storage tank. This type of material tank has a large volume, no specific structural requirements, and is easy to manufacture. Fixed support legs are installed at the bottom of the material tank, and it can be placed on a foundation, which is convenient for installation and has good stability.

[0039] refer to Figure 3As shown in this embodiment of the invention, the blowing pipe 6 and the conveying pipe 5 are located on the same axis, and the discharge pipe 4 and the conveying pipe 5 maintain an angle R, 30°≤R≤60°, preferably 40°≤R≤50°. This angle takes into account the ease with which stone powder enters the conveying pipe 5 from the discharge pipe 4. The end of the blowing pipe 6 is a contraction pipe 61, which is inserted into the conveying pipe 5. The diameter of the contraction pipe 61 gradually decreases along the opening of the conveying pipe 5, and the end of the contraction pipe 61 is located behind the center line of the connection between the discharge pipe 4 and the conveying pipe 5. The compressed gas ejected from the contraction pipe 61 enters the conveying pipe 5 at high speed. According to Bernoulli's principle, when the high-speed compressed gas is ejected from the outlet of the contraction pipe 61, a negative pressure is formed around and behind the outlet of the contraction pipe 61. The negative pressure reduces the pressure inside the discharge pipe 4, which is beneficial for stone powder to enter the discharge pipe 4 and from the discharge pipe 4 into the conveying pipe 5. In addition, when conveying stone powder, the blow-through pipe 6 is opened first to introduce compressed air to clear the conveying pipe 5 and prevent debris from causing blockage in the conveying pipe 5. The blow-through pipe 6 is also equipped with a valve to control the opening and closing of the blow-through gas, as well as a check valve to prevent stone powder from flowing back into the blow-through pipe 6 and clogging the blow-through pipe 6.

[0040] Reference Figure 4 As shown in the embodiment of the present invention, the receiving port 9 is designed in the shape of a trumpet with the larger opening facing downwards. The top opening is connected to the discharge pipe 4. The trumpet angle is 40° to 90°. If the angle is too small, it will not be conducive to the fluidized stone powder entering the discharge pipe 4. If the angle is too large, it will affect the downward movement of the stone powder in the upper part of the receiving port 9 into the space between the fluidizing device 8 and the receiving port 9, creating a vacuum, which is not conducive to the conveying of stone powder.

[0041] Reference Figure 5 As shown in the embodiment of the invention, the fluidization device 8 includes a fluidizing duct 81, a fluidizing bowl 82, and a support 83. The fluidizing bowl 82 is a semi-circular body or a similar irregular cone, hollow inside, like a bowl; the opening of the fluidizing bowl 82 faces upward. The fluidizing duct 81 is vertically inserted into the center of the fluidizing bowl 82, maintaining a certain distance from it. The fluidizing duct 81 and the fluidizing bowl 82 are fixed by the support 83, and the distance between the fluidizing duct 81 and the bottom surface of the fluidizing bowl 82 is 5-20 mm. Compressed gas is ejected from the fluidizing duct 81 and flows out from the gap between the fluidizing duct 81 and the fluidizing bowl 82, flowing upward along the inner wall of the fluidizing bowl 82, agitating the stone powder inside and above the fluidizing bowl 82, thus fluidizing the stone powder.

[0042] Reference Figure 6As shown in the embodiment of the present invention, when the material tank 1 is a horizontal pressure-resistant storage tank, due to the large left and right length of the material tank 1, the stone powder at both ends will not actively gather towards the receiving port 9 inside the material tank 1 and enter the discharge pipe 4, that is, the stone powder at both ends cannot be transported. Therefore, a material gathering device 10 is set at both ends of the horizontal material tank 1. The material gathering device 10 is connected to the external air supply pipe. The material gathering device 10 is an arc-shaped material gathering pipe 101. The material gathering pipe 101 is concentric with the cylindrical wall of the material tank 1, and the arc of the arc-shaped material gathering pipe 101 is 20° to 30°. A material gathering air hole 102 is set on the material gathering pipe 101. The opening of the material gathering air hole 102 faces inward and is parallel to the inner wall of the material tank 1. In this way, compressed gas is sprayed along the inner wall of the material tank 1 towards the center of the material tank 1 through the material gathering air hole 102, blowing the stone powder at both ends of the material tank 1 towards the central receiving port 9, thereby realizing the transportation of stone powder at both ends.

[0043] In this embodiment of the invention, the feed pipe 2 is located at the upper center of the material tank 1, and its upper end is connected to the material storage device such as the storage bin, and a valve is provided thereon. The preferred valve is an electric ball valve or a pneumatic ball valve.

[0044] In this embodiment of the invention, an exhaust pipe 8 is provided at the top of the material tank 1. If pressure is found inside the material tank 1 after the machine is stopped, it is forbidden to open the valves on the feed pipe 2 and the discharge pipe 4. If the valve on the feed pipe 2 is opened, gas will be discharged from the feed pipe 2 instantly. If the valve on the discharge pipe 4 is opened, stone powder will enter the discharge pipe 4 and cause the pipe to be blocked. The only way is to open the valve on the exhaust pipe 7 above the material tank 1 to vent the compressed air inside the tank.

[0045] In this embodiment of the invention, at least one pressure gauge is provided on the material tank 1 to detect the pressure inside the material tank 1, serving as a control point for the operation of the conveying device.

[0046] In this embodiment of the invention, pressure gauges and control valves are installed on the gas supply pipe and the gas inlet pipe 3 to detect the pressure inside the pipeline and switch the gas supply. A safety valve is also installed on the gas supply pipe to prevent accidents caused by excessive pressure due to malfunction.

[0047] In this embodiment of the invention, the compressed gas is mainly provided by an air compressor, or by other gas supply devices that meet the gas pressure requirements. The gas delivery pipe is connected to the air compressor to provide compressed gas to the stone powder conveying device.

[0048] Furthermore, in this embodiment of the invention, a stone powder conveying control system is also configured in the stone powder conveying device. The control system includes a PLC control cabinet, inlet pipe valves, air inlet pipe valves, outlet pipe valves, auxiliary blowing pipe valves, exhaust pipe valves, fluidizing air pipe valves, material gathering pipe valves, a level gauge, and a tank pressure gauge. The inlet pipe valves, air inlet pipe valves, outlet pipe valves, auxiliary blowing pipe valves, exhaust pipe valves, fluidizing air pipe valves, material gathering pipe valves, the level gauge, and the tank pressure gauge are electrically connected to the PLC control cabinet. The control cabinet is equipped with on / off buttons for the inlet pipe valve, air inlet pipe valve, outlet pipe valve, auxiliary blowing pipe valve, exhaust pipe valve, fluidizing air pipe valve, and material gathering air pipe valve. The feed pipe valve is controlled by the feed pipe valve switch button on the control cabinet; the air inlet pipe valve is controlled by the air inlet pipe switch button on the control cabinet; the discharge pipe valve is controlled by the discharge pipe valve switch button on the control cabinet; the auxiliary blowing pipe valve is controlled by the auxiliary blowing pipe valve switch button on the control cabinet; the exhaust pipe valve is controlled by the exhaust pipe valve switch button on the control cabinet; the fluidizing air pipe valve is controlled by the fluidizing air pipe valve switch button on the control cabinet; and the aggregate pipe valve is controlled by the aggregate pipe valve switch button on the control cabinet.

[0049] In addition, the PLC control program also includes linkage and individual control programs. When the linkage control program is selected, the stone powder conveying system will automatically complete the feeding, pressurizing and conveying processes. When the individual control program is selected, the relevant valves need to be manually opened or closed to complete the feeding, pressurizing and conveying processes.

[0050] In this embodiment of the invention, the working procedure is described as follows according to the linkage control program:

[0051] Switch the mode switch on the control cabinet to the "linkage" state and click the "start" switch.

[0052] The control program sends an opening command to the feeding pipe valve to start feeding; when the stone powder in the material tank 1 reaches the set height, that is, when the stone powder is full, the level gauge sends a stone powder full signal to the PLC control cabinet, and the PLC control cabinet sends a closing signal to the feeding pipe valve.

[0053] After the feed pipe valve is closed, the control program first sends an opening command to the fluidizing air pipe valve, and then sends an opening command to the air inlet pipe valve to deliver compressed gas into the material tank 1. When the pressure in the material tank 1 reaches 0.25MPa, the pressure gauge on the material tank 1 sends a pressure signal to the PLC control cabinet. The PLC control cabinet sends an opening command to the valve on the auxiliary blowing pipe. After 20 seconds, it sends an opening command to the discharge pipe valve to start conveying stone powder.

[0054] When the pressure in tank 1 drops to 0.07MPa, the PLC control cabinet sends a shut-off command to the delivery pipe valve or air compressor after 50 seconds, and then sends shut-off commands to the blow-off pipe valve, fluidizing air pipe valve and air inlet pipe valve.

[0055] When the pressure inside the tank drops to 0.02MPa, the PLC control cabinet sends a closing command to the discharge pipe valve and an opening command to the feed pipe valve to begin the next cycle of stone powder conveying.

[0056] In summary, the stone powder conveying device of this invention has a large tank volume and a large single conveying capacity. The fluidizing device and receiving port for conveying are set inside the tank to avoid material leakage and environmental impact. Furthermore, with the configuration of a PLC automatic control system, automated conveying can be achieved, resulting in higher efficiency and saving labor.

[0057] This invention provides a stone powder conveying device and a stone powder conveying method, the specific steps of which are as follows:

[0058] Add material, close the valve on the discharge pipe 4 and the valve on the air inlet pipe 3, open the valve on the exhaust pipe 8, and open the valve on the feed pipe 2 to add stone powder into the material tank 1;

[0059] After pressurization and feeding are completed, close the valve on the feed pipe 2 and the valve on the exhaust pipe 8, first open the valve on the fluidizing air pipe 81 and then open the valve on the air inlet pipe 3 to introduce compressed gas into the material tank 1.

[0060] When the pressure inside the material tank 1 reaches the set pressure requirement, the valve on the auxiliary blowing pipe 6 is opened first, and then the valve on the discharge pipe 4 is opened. Under the pressure of the material tank 1 and the driving force of the auxiliary blowing air of the auxiliary blowing pipe 6, the stone powder enters the discharge pipe 4 and then enters the conveying pipe 5.

[0061] In this embodiment of the invention, in order to ensure the transport of stone powder, the pressure of the compressed gas is 0.25 to 0.3 MPa.

[0062] In this embodiment of the invention, the material tank 1 is pressurized before conveying, and the set pressure in the material tank 1 is 0.25 MPa.

[0063] In this embodiment of the invention, a pressure of 0.05–0.07 MPa inside the material tank 1 is used as a criterion for determining the end of stone powder conveying. A pressure of 0–0.02 MPa inside the material tank 1 is used as a general criterion for closing the air inlet pipe 3 valve and opening the feed pipe 2 valve, and then closing the discharge pipe 4 valve after 50 seconds.

[0064] The gas ejected from the blowpipe 6 assists in conveying the stone powder. During the conveying stage, it is required that the valve on the blowpipe 6 be opened for 20 seconds before opening the valve on the discharge pipe 4. The main purpose of opening the valve on the blowpipe 6 first is to purge the pipeline and prevent material from causing blockage.

[0065] In summary, the stone powder conveying method provided by this invention can complete the loading, pressurization of the hopper, and conveying of stone powder within 6 minutes, and a pumping cycle does not exceed 10 minutes, thus exhibiting high conveying efficiency.

[0066] Example 1

[0067] A specific embodiment of the present invention is described below:

[0068] The device for conveying stone powder includes a 10 cubic meter tank. Tank 1 is a horizontal cylindrical body with circular ends. A feed pipe 2 (DN300 diameter) is located at the center of the upper part of tank 1, and a valve is installed on feed pipe 2. An air inlet pipe 3 (DN50 diameter) is located at the top of tank 1, and a valve and pressure gauge are installed on air inlet pipe 3. A fluidizing device 8 is located at the center of the bottom of tank 1. A receiving port 9 is located 500mm directly above fluidizing device 8, and it connects to a discharge pipe 4 (DN100 diameter). A valve is installed at the front end where the discharge pipe 4 connects to the conveying pipe 5. An exhaust pipe 7 (DN25 diameter) is located at one end of the upper part of tank 1, and a valve is installed on exhaust pipe 7. Aggregating devices 10 (DN20 diameter, DN20 diameter, DN20 diameter, DN20 diameter, DN20 diameter, DN20 diameter, and DN20 diameter) are installed at both ends of tank 1. A manhole is installed in the middle of one side of the tank, and a pressure gauge is installed on the top of the tank.

[0069] A blow-assisted pipe 6 is installed at the connection between the discharge pipe 4 and the conveying pipe 5. The diameter of the blow-assisted pipe 6 is DN25. The blow-assisted pipe 6 and the conveying pipe 5 are located on the same axis. The included angle between the discharge pipe 4 and the conveying pipe 5 is R = 50°. The end of the blow-assisted pipe 6 is inserted into the conveying pipe 5 in a constricted shape. The end of the blow-assisted pipe 6 is located 30mm behind the center line of the connection between the discharge pipe 4 and the conveying pipe 5.

[0070] The air inlet pipe 3, fluidizing air pipe 81 and blowing aid pipe 6 are all connected to the air supply pipe and are supplied with the same compressed gas; valves and check valves are installed on the blowing aid pipe 6.

[0071] The method for conveying stone powder in this embodiment is as follows:

[0072] Add material, close the valve on the discharge pipe 4 and the valve on the air inlet pipe 3, open the valve on the exhaust pipe 7, and open the valve on the feed pipe 2 to add stone powder into the material tank 1, with an addition amount of about 10 tons.

[0073] After pressurization and feeding are completed, close the valve on the feed pipe 2 and the valve on the exhaust pipe 7. First open the valve on the fluidizing air pipe 81 and then open the valve on the air inlet pipe 3 to introduce compressed gas into the material tank 1.

[0074] During conveying, once the pressure inside tank 1 reaches 0.25 MPa, first open the valve on the auxiliary blowing pipe 6, and 20 seconds later open the valve on the discharge pipe 4. The stone powder, under the pressure of the tank 1 and driven by the auxiliary blowing air from the auxiliary blowing pipe 6, enters the discharge pipe and then the conveying pipe 5. At this point, the pressure inside tank 1 stabilizes at 0.2 MPa, indicating good stone powder conveying. Approximately one minute after starting the conveying process, open the valve on the agglomeration pipe 101 to agglomerate the stone powder towards the center of tank 1.

[0075] When the pressure inside the material tank 1 drops to 0.07MPa, it indicates that the stone powder in the material tank 1 has been completely conveyed. After 50 seconds, turn off the air compressor, and then close the valve on the blow pipe 6 and the valve on the air inlet pipe 3.

[0076] When the pressure inside the tank drops to 0.02MPa, close the valves on the fluidizing air pipe 81, the material gathering pipe 101 and the discharge pipe 4, and open the valve on the feed pipe to start the next cycle of stone powder conveying.

[0077] In this embodiment, one working cycle takes about 10 minutes and transports about 10 tons of stone powder; the process of introducing gas into the tank for pressurization takes 3 minutes, and the transportation of 10 tons of stone powder in the tank is completed in 3 minutes, so it has a relatively efficient transportation capacity.

[0078] The compressed gas used in this embodiment is supplied by an air compressor. As the air compressor starts, the pressure of the compressed gas gradually rises from 0. To ensure safety, the working time of the air compressor is set to not exceed 50 minutes, and at least one safety valve is installed on the air supply pipe. When the pressure in the air supply pipe exceeds 0.3 MPa, the safety valve opens to release pressure.

[0079] Example 2

[0080] Another specific embodiment of the present invention is described below:

[0081] The device for conveying stone powder includes a 5 cubic meter silo. Silo 1 is a vertical cylinder with rounded ends. A feed pipe 2 (DN300 diameter) with a valve is installed at the center of the upper part of silo 1. An air inlet pipe 3 (DN50 diameter) with a valve and a pressure gauge is installed at the top of silo 1. A fluidizing device 8 is located at the center of the bottom of silo 1. A receiving port 9 (DN100 diameter) is located 300 mm directly above the fluidizing device 8 and connects to a discharge pipe 4 (DN50 diameter). A valve is installed at the front end where the discharge pipe 4 connects to the conveying pipe 5. An exhaust pipe 7 (DN25 diameter) with a valve is installed on one side of the upper part of silo 1. A manhole is located in the middle of one side of the silo, and a pressure gauge is installed at the top of the silo.

[0082] A blow-assisted pipe 6 is installed at the connection between the discharge pipe 4 and the conveying pipe 5. The diameter of the blow-assisted pipe 6 is DN25. The blow-assisted pipe 6 and the conveying pipe 5 are located on the same axis. The included angle between the discharge pipe 4 and the conveying pipe 5 is R = 50°. The end of the blow-assisted pipe 6 is inserted into the conveying pipe 5 in a constricted shape. The end of the blow-assisted pipe 6 is located 30mm behind the center line of the connection between the discharge pipe 4 and the conveying pipe 5.

[0083] The air inlet pipe 3, fluidizing air pipe 81 and blowing aid pipe 6 are all connected to the air supply pipe and are supplied with the same compressed gas; valves and check valves are installed on the blowing aid pipe 6.

[0084] The method for conveying stone powder in this embodiment is as follows:

[0085] Add material, close the valve on the discharge pipe 4 and the valve on the air inlet pipe 3, open the valve on the exhaust pipe 7, and open the valve on the feed pipe 2 to add stone powder into the material tank 1, with an addition amount of about 5 tons.

[0086] After pressurization and feeding are completed, close the valve on the feed pipe 2 and the valve on the exhaust pipe 7. First open the valve on the fluidizing air pipe 81 and then open the valve on the air inlet pipe 3 to introduce compressed gas into the material tank 1.

[0087] During conveying, once the pressure inside the material tank 1 reaches 0.25 MPa, the valve on the auxiliary blowing pipe 6 is opened first, and 20 seconds later, the valve on the discharge pipe 4 is opened. Under the pressure of the material tank 1 and the driving force of the auxiliary blowing air from the auxiliary blowing pipe 6, the stone powder enters the discharge pipe and then enters the conveying pipe 5. At this time, the pressure inside the material tank 1 stabilizes at 0.2 MPa, indicating that the stone powder is being conveyed well.

[0088] When the pressure inside the material tank 1 drops to 0.07MPa, it indicates that the stone powder in the material tank 1 has been completely conveyed. After 50 seconds, turn off the air compressor, and then close the valve on the blow pipe 6 and the valve on the air inlet pipe 3.

[0089] When the pressure inside the tank drops to 0.02MPa, close the valves on the fluidizing air pipe 81, the material gathering pipe 101 and the discharge pipe 4, and open the valve on the feed pipe to start the next cycle of stone powder conveying.

[0090] In this embodiment, one working cycle takes about 7 minutes and transports about 5 tons of stone powder; the process of introducing gas into the tank for pressurization takes 1 minute, and the transportation of 5 tons of stone powder in the tank takes 2 minutes, so it has a relatively efficient transportation capacity.

[0091] The compressed gas used in this embodiment is supplied by an air compressor. As the air compressor starts, the pressure of the compressed gas gradually rises from 0. To ensure safety, the working time of the air compressor is set to not exceed 30 minutes, and at least one safety valve is installed on the air supply pipe. When the pressure in the air supply pipe exceeds 0.3 MPa, the safety valve opens to release pressure.

[0092] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stone powder conveying device, comprising a material tank (1), a feed pipe (2), an air inlet pipe (3), a discharge pipe (4), a conveying pipe (5), and an exhaust pipe (7), characterized in that, A fluidizing device (8) and a receiving port (9) are provided inside the material tank (1). The fluidizing device (8) is located at the bottom of the material tank (1). The receiving port (9) is connected to the discharge pipe (4). The fluidizing device (8) and the receiving port (9) are located on the same vertical line. The fluidizing device (8) is located below the receiving port (9). The fluidization device (8) includes a fluidizing duct (81), a fluidizing bowl (82), and a support (83). The opening of the fluidizing bowl (82) faces upward, and the fluidizing duct (81) is inserted into the fluidizing bowl (82). The fluidizing duct (81) and the fluidizing bowl (82) are fixed by the support (83). The distance between the fluidizing duct (81) and the bottom surface of the fluidizing bowl (82) is 5 to 20 mm. Material gathering devices (10) are provided at both ends of the material tank (1). The material gathering devices (10) are connected to the external gas supply pipe. The material gathering device (10) is a material gathering pipe (101). The material gathering pipe (101) is concentric with the cylindrical wall of the material tank (1). The arc of the material gathering pipe (101) is 20° to 30°. A material gathering air hole (102) is provided on the material gathering pipe (101). The opening of the material gathering air hole (102) faces inward and is parallel to the inner wall of the material tank (1).

2. The stone powder conveying device according to claim 1, characterized in that, The receiving port (9) is trumpet-shaped with the larger opening facing downwards, and the top opening is connected to the discharge pipe (4).

3. The stone powder conveying device according to claim 1, characterized in that, The distance between the top surface of the fluidizing device (8) and the bottom surface of the receiving port (9) is 250-600 mm.

4. The stone powder conveying device according to claim 1, characterized in that, The discharge pipe (4) is connected to the conveying pipe (5) and is provided with a blowing aid pipe (6); the blowing aid pipe (6) is coaxially connected to the conveying pipe (5), and the end of the blowing aid pipe (6) is a shrink tube (61). The shrink tube (61) is inserted into the conveying pipe (5). The shrink tube (61) gradually narrows along the diameter of the conveying pipe (5). The end of the shrink tube (61) is located behind the center line of the connection between the discharge pipe (4) and the conveying pipe (5); the included angle between the discharge pipe (4) and the blowing aid pipe (6) is R, 30°≤R≤60°.

5. A method for conveying stone powder using the stone powder conveying device according to any one of claims 1-4, characterized in that, Includes the following steps: Add material, close the valve on the discharge pipe (4) and the valve on the air inlet pipe (3), open the valve on the exhaust pipe (7), and open the valve on the feed pipe (2) to add stone powder into the material tank (1); After pressurization and feeding are completed, close the valve on the feed pipe (2) and the valve on the exhaust pipe (7), and open the valve on the fluidizing air pipe (81) and the air inlet pipe (3) in sequence to introduce compressed gas into the material tank (1); When the pressure in the tank (1) reaches the set pressure requirement, the valve on the blowing pipe (6) is opened first, and then the valve on the discharge pipe (4) is opened. The stone powder enters the discharge pipe (4) from the receiving port (9) under the fluidization of the fluidizing device (8) and the pressure of the tank (1). Under the blowing air of the blowing pipe (6), the stone powder enters the conveying pipe (5) from the discharge pipe (4). If pressure is found in the material tank (1) after the machine is stopped, first open the valve on the exhaust pipe (7) on the material tank (1) to empty the compressed air in the tank, and then open the valves on the feed pipe (2) and the discharge pipe (4).

6. The stone powder conveying method according to claim 5, characterized in that, The pressure of the compressed gas is 0.25 to 0.3 MPa, and the set pressure is 0.25 MPa.

7. The stone powder conveying method according to claim 5, characterized in that, During the conveying step, the valve on the blowing pipe (6) is opened for 20 seconds, and then the valve on the discharge pipe (4) is opened.

8. The stone powder conveying method according to claim 5, characterized in that, When the pressure inside the material tank (1) reaches 0.05 to 0.07 MPa, it indicates that the conveying is over. After the conveying is over, when the pressure inside the material tank (1) is 0 to 0.02 MPa, close the valve on the air inlet pipe (3), open the valve on the feed pipe (2), and close the valve on the discharge pipe (4) after 50 seconds.

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