An automated precise filling device for ultra-fine dry powder fire extinguishers and a method of use
By designing an automated filling device for ultrafine dry powder fire extinguishers, and utilizing a vacuum system and solenoid valves to control air pressure and flow, the problems of low filling accuracy and pollution of ultrafine dry powder fire extinguishers have been solved, achieving an efficient and accurate automated filling process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING MECHANICAL EQUIP INST
- Filing Date
- 2023-11-16
- Publication Date
- 2026-06-23
AI Technical Summary
Existing ultrafine dry powder fire extinguisher filling equipment suffers from low precision, low efficiency of manual operation, poor product consistency, inability to achieve precise control and automated filling, and the ultrafine dry powder is prone to overflow and environmental pollution.
An automated precision filling device was designed, comprising a vacuum system, a filling system, a powder supply system, and a control system. By utilizing components such as a vacuum pump, a solenoid valve, and a weighing sensor, the device achieves an automated filling process through precise control of air pressure and flow rate.
It enables efficient and precise filling of ultrafine dry powder fire extinguishers, reduces environmental pollution, improves production efficiency and product consistency, and meets the filling requirements of different specifications and sizes.
Smart Images
Figure CN117818950B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the fields of mechanical manufacturing and fire extinguisher dry powder filling devices, and more specifically, to an automated and precise filling device for ultrafine dry powder fire extinguishers and its usage method. Background Technology
[0002] Currently, ultrafine dry powder fire extinguishers, compared to ordinary dry powder fire extinguishers, have advantages such as high extinguishing efficiency, adaptability to both enclosed and open environments, and strong resistance to reignition, and are widely used in the fire protection field. The main difference between ultrafine dry powder fire extinguishers and ordinary dry powder fire extinguishers lies in the particle size of the extinguishing agent. Ordinary dry powder has an average particle size of 30-60 micrometers, while ultrafine dry powder typically has a 90% filler content of 0-3% of the designed filling amount. Due to the smaller particle size and lower bulk density of ultrafine dry powder, it is much lighter than ordinary dry powder and is easily suspended, making accurate filling of ultrafine dry powder fire extinguishers more difficult.
[0003] In the prior art, an ultrafine dry powder filling device (CN217864854U) is proposed. This device can position and clamp the fire extinguisher canister, first using a vacuum pump to create a vacuum in the canister, then connecting the powder source, and relying on the vacuum to draw the dry powder into the canister, thereby completing the filling. This method can fill the fire extinguisher canister with ultrafine dry powder, but it cannot precisely control the filling volume, nor can it achieve automated filling. A suspended fire extinguisher ultrafine dry powder filling mechanism with precise weighing function (CN214268109U) is proposed. This mechanism first aligns the filling cylinder with the fire extinguisher bottle, then uses a vacuum pump to create a vacuum in the bottle, and then connects the powder source. The dry powder is drawn into the bottle by the vacuum. The electronic scale is manually monitored continuously. Once the target weight is reached, the powder source is disconnected, thus completing the filling process. This method can fill the fire extinguisher bottle with ultrafine dry powder and allows for relatively precise control of the filling amount, but it cannot achieve automated filling. Furthermore, in actual use, there is a possibility of residual ultrafine dry powder in the filling cylinder. When separated from the fire extinguisher bottle, this residual powder will overflow, causing environmental pollution and posing occupational health hazards to operators.
[0004] In summary, at least one of the following technical problems exists:
[0005] Currently, ultrafine dry powder fire extinguisher filling equipment generally suffers from low precision, low efficiency of manual operation, poor consistency of manually produced products, frequent overflow of ultrafine dry powder polluting the environment, and the inability to accurately control the filling volume while achieving automated filling. Summary of the Invention
[0006] The main objective of this invention is to provide an automated and precise filling device for ultrafine dry powder fire extinguishers, in order to solve the problems that existing ultrafine dry powder fire extinguisher filling equipment generally suffers from low precision, low efficiency of manual operation, poor consistency of manually produced products, frequent overflow of ultrafine dry powder polluting the environment, and inability to accurately control the filling volume while achieving automated filling.
[0007] To achieve the above objectives, according to one aspect of the present invention, an automated and precise filling device for ultrafine dry powder fire extinguishers is provided, comprising:
[0008] A vacuum system having a vacuum pump connected to a vacuum tank connected to a filling system;
[0009] A filling system having a base, a weighing device on the base, a support at the upper end of the weighing device, a lifting cylinder in the support, a tooling plate at the upper end of the lifting cylinder, an ultra-fine dry powder fire extinguisher at the upper end of the tooling plate, a powder filling head above the ultra-fine dry powder fire extinguisher, the powder filling head being connected to a powder filling chamber, and the powder filling chamber being connected to the atmosphere, high-pressure gas, and low-pressure gas;
[0010] The powder supply system includes a powder hopper connected to a powder filling chamber via a powder conveying pipeline; and
[0011] The control system is connected to the vacuum system, the filling system, and the powder supply system, respectively.
[0012] Preferably, a one-way shut-off valve is provided between the vacuum tank and the vacuum pump, and a first solenoid valve and a fifth solenoid valve are provided between the vacuum tube and the powder filling cavity.
[0013] Preferably, the powder conveying pipeline is provided with a powder conveying pipeline support to support the powder conveying pipeline.
[0014] Preferably, the weighing device includes a first weighing sensor and a second weighing sensor, which are symmetrically arranged on the base.
[0015] Preferably, the support is equipped with a pneumatic vibrator, and the powder bucket is equipped with a stirring device.
[0016] Preferably, the upper end of the powder filling cavity is provided with a clamping valve, which has the function of controlling the opening of the powder filling cavity.
[0017] Preferably, the vacuum tank is equipped with a vacuum pressure gauge, which facilitates observation of the current vacuum pressure. The vacuum pressure can be adjusted by adjusting the power of the vacuum pump.
[0018] Preferably, the powder filling cavity is equipped with a filter element, which serves as a filter.
[0019] Preferably, the pinch valve is connected to a second, third, and fourth solenoid valve. The difference between the actual measured value of the weighing device and the tare weight is recorded as the actual filling amount. When the actual filling amount reaches 80% of the target filling amount, the third solenoid valve resets, and the second solenoid valve activates, applying low-pressure gas to the pinch valve, causing it to open slightly. This allows the ultrafine dry powder to be drawn into the filling chamber at a small flow rate under vacuum, initiating the precise filling process. The first and fifth solenoid valves activate, connecting the filling chamber, vacuum pipeline, and vacuum tank, thereby creating a vacuum inside the filling chamber and the ultrafine dry powder fire extinguisher. Simultaneously, the fourth solenoid valve resets, and the third solenoid valve activates, applying high-pressure gas to the pinch valve, causing it to open fully. This allows the ultrafine dry powder to be drawn into the filling chamber at a large flow rate under vacuum, initiating the coarse filling process.
[0020] According to another aspect of the present invention, a method of using an automated precision filling device for ultrafine dry powder fire extinguishers is provided, comprising:
[0021] Step 1: Select the appropriate filling head according to the model and specifications of the ultra-fine dry powder fire extinguisher to be filled and install it at the bottom of the filling chamber;
[0022] Step 2: The device is powered on, and the vacuum pump starts to draw a vacuum under the control of the central controller. The vacuum tank is evacuated through the one-way shut-off valve. At the same time, the stirring device in the powder bucket starts to operate and continuously disperses the ultrafine dry powder in the bucket.
[0023] Step 3: Place the ultrafine dry powder fire extinguisher on the tooling plate;
[0024] Step 4: Select the appropriate filling volume on the central controller and start the automatic filling operation;
[0025] Step 5: The lifting cylinder lifts the tooling plate, thereby moving the ultra-fine dry powder fire extinguisher upward, so that the mouth of the ultra-fine dry powder fire extinguisher bottle is in close contact with the powder filling head and achieves a sealing effect.
[0026] Step 6: The central controller reads the stable measurement value of the weighing sensor and records it as the tare weight;
[0027] Step 7: The first and fifth solenoid valves are activated to connect the powder filling chamber, vacuum pipeline, and vacuum tank, thereby creating a vacuum inside the powder filling chamber and the ultrafine dry powder fire extinguisher. At the same time, the fourth solenoid valve is reset and the third solenoid valve is activated to apply high-pressure gas to the pinch valve, causing the pinch valve to open to a large degree. Thus, the ultrafine dry powder is drawn into the powder filling chamber in a large flow rate under vacuum, and the rough filling process begins.
[0028] Step 8: Under vacuum, the ultrafine dry powder is continuously drawn into the powder filling chamber in large flow rate, and then enters the ultrafine dry powder fire extinguisher through the powder filling head. The measured value of the weighing device will gradually increase as the weight of the ultrafine dry powder drawn in increases.
[0029] Step 9: The difference between the actual measured value of the weighing device and the tare weight is recorded as the actual filling amount. When the actual filling amount reaches 80% of the target filling amount, the third solenoid valve is reset and the second solenoid valve is activated, which applies low-pressure gas to the pinch valve, causing the pinch valve to open slightly. Thus, the ultrafine dry powder is drawn into the powder filling cavity in a small flow rate under vacuum, and the precise filling process begins.
[0030] Step 10: Under vacuum, the ultrafine dry powder is successively drawn into the powder filling chamber in small flow rates, and then enters the ultrafine dry powder fire extinguisher through the powder filling head. The measured value of the weighing device will continue to gradually increase as the weight of the ultrafine dry powder drawn in increases.
[0031] Step 11: The difference between the actual measured value of the weighing device and the tare weight is recorded as the actual filling amount. When the actual filling amount reaches 100% of the target filling amount, the second solenoid valve is reset, the fourth solenoid valve is activated, and atmospheric pressure is applied to the clamp valve to close it, thus ending the precision filling process.
[0032] Step 12: The first and fifth solenoid valves are reset, disconnecting the powder filling chamber, vacuum pipeline, and vacuum tank. At the same time, the powder filling chamber is connected to the atmosphere through the fifth solenoid valve. Under the action of the atmosphere, the powder filling chamber and the ultra-fine dry powder fire extinguisher restore atmospheric pressure. At this time, there will be a large amount of air remaining in the ultra-fine dry powder fire extinguisher, which will result in the ultra-fine dry powder not being completely filled into the ultra-fine dry powder fire extinguisher. Therefore, there will be some dry powder residue in the powder filling chamber.
[0033] Step 13: The first and fifth solenoid valves activate again, connecting the powder filling chamber, vacuum pipeline, and vacuum tank, thereby creating a second vacuum inside the powder filling chamber and the ultra-fine dry powder fire extinguisher, removing the residual air inside the ultra-fine dry powder fire extinguisher, and allowing the residual ultra-fine dry powder in the powder filling chamber to continue filling into the ultra-fine dry powder fire extinguisher.
[0034] Step 14: The first and fifth solenoid valves are reset again, disconnecting the powder filling chamber, vacuum pipeline, and vacuum tank. At the same time, the powder filling chamber is reconnected to the atmosphere through the fifth solenoid valve. Under the action of the atmosphere, the remaining ultrafine dry powder in the powder filling chamber will be completely pressed into the ultrafine dry powder fire extinguisher.
[0035] Step 15: The lifting cylinder lowers the tooling plate, thereby moving the ultrafine dry powder fire extinguisher downwards, causing the nozzle of the ultrafine dry powder fire extinguisher to detach from the powder filling head, thus completing an automated filling process.
[0036] The technical solution of this invention has the following technical effects:
[0037] To achieve optimal fire extinguishing efficiency, ultrafine dry powder fire extinguishers have strict limitations on their filling volume, with an error typically between 0-3% of the designed filling volume. Due to the small particle size and low bulk density of ultrafine dry powder, it is much lighter than ordinary dry powder and prone to suspension, making precise filling of ultrafine dry powder fire extinguishers quite difficult. This invention proposes an automated and precise filling device and method for ultrafine dry powder fire extinguishers, featuring high filling efficiency, high precision, and good product consistency. It can quickly meet the filling requirements of ultrafine dry powder fire extinguishers of different specifications and sizes, resulting in high production efficiency. Attached Figure Description
[0038] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:
[0039] Figure 1 A schematic diagram of the structure of the automated precision filling device for ultrafine dry powder fire extinguishers according to the present invention is shown.
[0040] The above figures include the following reference numerals:
[0041] Vacuum pump 11; one-way shut-off valve 12; vacuum tank 13; first solenoid valve 14; vacuum pipeline 15; second solenoid valve 21; third solenoid valve 22; fourth solenoid valve 23; fifth solenoid valve 24; clamp valve 25; powder filling chamber 261; filter element 262; powder filling head 263; pneumatic vibrator 271; bracket 272; tooling plate 273; lifting cylinder 274; first weighing sensor 275; second weighing sensor 276; base 277; ultra-fine dry powder fire extinguisher 3; powder bucket 41; stirring device 42; powder conveying pipeline 43; powder conveying pipeline bracket 44; central controller 5. Detailed Implementation
[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0043] like Figure 1As shown in the figure, this invention provides an automated precision filling device for ultrafine dry powder fire extinguishers, including a vacuum system. The vacuum system has a vacuum pump 11 connected to a vacuum tank 13, which is connected to a filling system. The filling system has a base 277 with a weighing device on it. A bracket 272 is provided at the upper end of the weighing device, and a lifting cylinder 274 is provided in the bracket 272. A tooling plate is provided at the upper end of the lifting cylinder 274. 273, the upper end of the tooling plate 273 is provided with an ultra-fine dry powder fire extinguisher 3, the upper part of the ultra-fine dry powder fire extinguisher 3 is provided with a powder filling head 263, the powder filling head 263 is connected to the powder filling chamber 261, the powder filling chamber 261 is connected to the atmosphere, high-pressure gas and low-pressure gas; powder supply system, the powder supply system powder tank 41, the powder tank 41 is connected to the powder filling chamber 261 through the powder conveying pipeline 43; control system, the controller system is connected to the vacuum system, the filling system and the powder supply system respectively.
[0044] This embodiment mainly consists of a vacuum system, a filling system, a powder supply system, and a control system. The vacuum system includes a vacuum pump 11, a one-way shut-off valve 12, a vacuum tank 13, a solenoid valve, and a vacuum pipeline 15. The filling system includes a second solenoid valve 21, a third solenoid valve 22, a fourth solenoid valve 23, a fifth solenoid valve 24, a clamping valve 25, a powder filling chamber 261, a filter element 262, a powder filling head 263, a pneumatic vibrator 271, a support 272, a tooling plate 273, a lifting cylinder 274, a first weighing sensor 275, a second weighing sensor 276, and a base 277. The powder supply system includes a powder hopper 41, a stirring device 42, a powder conveying pipeline 43, and a powder conveying pipeline support 44. The control system includes a central controller 5. This application features high filling efficiency, high precision, and good product consistency, and can quickly meet the filling requirements of ultra-fine dry powder fire extinguishers of different specifications and sizes.
[0045] In this embodiment, the vacuum system includes a vacuum pump 11, a one-way shut-off valve 12, a vacuum tank 13, a solenoid valve, and a vacuum pipeline 15. The vacuum pump 11 is connected to the vacuum tank 13, and the vacuum tank 13 is connected to the filling system. A one-way shut-off valve 12 is provided between the vacuum tank 13 and the vacuum pump 11. A first solenoid valve 14 and a fifth solenoid valve 24 are provided between the vacuum pipeline and the powder filling cavity 261. A vacuum pressure gauge is provided on the vacuum tank 13. Specifically, the vacuum pump 11 is responsible for evacuating the vacuum and is connected to the vacuum tank 13 through the one-way shut-off valve 12. The vacuum tank 13 has a vacuum pressure gauge for easy observation of the current vacuum pressure. The vacuum pressure can be adjusted by adjusting the power of the vacuum pump 11. The vacuum tank 13 can improve the efficiency of evacuation. The vacuum tank 13 is connected to the vacuum pipeline 15 through the first solenoid valve 14, and the opening and closing of the vacuum tank 13 and the vacuum pipeline 15 can be controlled by the first solenoid valve 14.
[0046] In this embodiment, the filling system has a base 277, a weighing device on the base 277, a support 272 on the upper end of the weighing device, a pneumatic vibrator 271 on the support 272, a stirring device 42 inside the powder hopper 41, a lifting cylinder 274 in the support 272, a tooling plate 273 on the upper end of the lifting cylinder 274, an ultra-fine dry powder fire extinguisher 3 on the upper end of the tooling plate 273, a powder filling head 263 above the ultra-fine dry powder fire extinguisher 3, the powder filling head 263 connected to the powder filling chamber 261, the powder filling chamber 261 connected to the atmosphere, high-pressure gas, and low-pressure gas, and the weighing device includes a first weighing sensor 275 and a second weighing sensor 276, which are symmetrically arranged on the base. On the base 277, a filter element 262 is installed inside the powder filling chamber 261. A pinch valve 25 is connected to a second solenoid valve 21, a third solenoid valve 22, and a fourth solenoid valve 23. Specifically, the pinch valve 25 can change its opening degree according to the incoming air pressure. When the air pressure is atmospheric pressure, it is closed. As the air pressure increases, its opening degree gradually increases until it reaches its maximum opening. By controlling the second solenoid valve 21, the third solenoid valve 22, and the fourth solenoid valve 23, the pinch valve 25 can be individually connected to low-pressure gas, high-pressure gas, and the atmosphere, respectively, thus achieving the connection effect of small opening, large opening, and closed connection. In the initial state, the fourth solenoid valve 23 activates, connecting the pinch valve 25 to the atmosphere and placing it in a closed state, thus connecting the pinch valve 25 to the powder filling chamber 261. The powder filling chamber 261 is made of a smooth, low-adhesion-coefficient material to prevent ultrafine dry powder from adhering to the inner wall of the chamber, ensuring filling accuracy and preventing dust overflow and environmental pollution. A filter element 262 is installed on the upper part of the powder filling chamber 261. The filter screen size of the filter element 262 ensures that ultrafine dry powder cannot pass through, but air can. The lower part of the powder filling chamber 261 is connected to the powder filling head 263. The connection method adopts a quick-change type. The powder filling head 263 can be designed according to the bottle opening size of the ultrafine dry powder fire extinguisher being filled, so as to ensure that the powder filling head 263 can achieve a sealing effect after making close contact with the bottle opening of the ultrafine dry powder fire extinguisher. The powder filling chamber 261 is fixedly connected to the bracket 272. The bracket 272 is equipped with a pneumatic vibrator 271. The pneumatic vibrator 271 will generate vibration when gas is introduced, which can improve the filling efficiency of ultrafine dry powder in the powder filling chamber 261 and also avoid ultrafine dry powder residue. The bracket 272 is equipped with a lifting cylinder 274, which is connected to the tooling plate 273. The lifting cylinder 274 can drive the tooling plate 273 to move vertically. The tooling plate 273 can be designed according to the size of the ultrafine dry powder fire extinguisher to be filled, so as to effectively restrict the ultrafine dry powder fire extinguisher to the center position of the tooling plate 273. This ensures that when the tooling plate 273 is driven upward by the lifting cylinder 274, the mouth of the ultrafine dry powder fire extinguisher can be made to come into close contact with the powder filling head 263 to achieve a sealing effect, and the center position of the tooling plate 273 is roughly consistent with that of the powder filling head 263.The support 272 is connected to the base 277 via a first weighing sensor 275 and a second weighing sensor 276. The first weighing sensor 275 and the second weighing sensor 276 can weigh the support 272 and all objects on it. The base 277 is fixed to the ground, supporting all objects on it and ensuring its stability.
[0047] In this embodiment, the powder supply system includes a powder hopper 41, which is connected to the powder filling cavity 261 via a powder conveying pipeline 43. A powder conveying pipeline support 44 is provided on the powder conveying pipeline 43. Specifically, the powder supply system includes a powder hopper 41, a stirring device 42, a powder conveying pipeline 43, and a powder conveying pipeline support 44. The powder hopper 41 stores the ultrafine dry powder to be filled. The powder hopper 41 is equipped with a stirring device 42 to prevent the ultrafine dry powder from clumping and to ensure smooth flow. The lower part of the powder hopper 41 is connected to the powder conveying pipeline 43. The powder conveying pipeline support 44 supports the powder conveying pipeline 43, allowing it to hang naturally and eventually connect to the clamp valve 25.
[0048] In this embodiment, the controller system is connected to the vacuum system, the filling system and the powder supply system respectively. The specific control system includes a central controller 5, which can realize the automated control of each device in the entire filling process to achieve automated filling.
[0049] Another embodiment of the present invention provides a method for using an automated precision filling device for ultrafine dry powder fire extinguishers, comprising:
[0050] Step 1: Select the appropriate powder filling head 263 according to the model and specifications of the ultrafine dry powder fire extinguisher to be filled and install it to the lower part of the powder filling chamber 261.
[0051] Step 2: The device is powered on, and the vacuum pump 11 starts to draw a vacuum under the control of the central controller 5. The vacuum tank 13 is evacuated through the one-way shut-off valve 12. At the same time, the stirring device 42 in the powder tank 41 starts to operate, continuously breaking up the ultrafine dry powder in the tank.
[0052] Step 3: Place the ultrafine dry powder fire extinguisher on tooling plate 273.
[0053] Step 4: Select the appropriate filling volume on the central controller 5 and start the automatic filling operation.
[0054] Step 5: Lifting cylinder 274 lifts tooling plate 273, thereby driving the ultrafine dry powder fire extinguisher to move upward, so that the mouth of the ultrafine dry powder fire extinguisher bottle is in close contact with the powder filling head 263 and achieves a sealing effect.
[0055] Step 6: The central controller 5 reads the stable measurement value of the weighing sensor and records it as the tare weight.
[0056] Step 7: The first solenoid valve 14 and the fifth solenoid valve 24 are activated to connect the powder filling chamber 261, the vacuum line 15, and the vacuum tank 13, thereby creating a vacuum inside the powder filling chamber 261 and the ultrafine dry powder fire extinguisher. At the same time, the fourth solenoid valve 23 is reset, and the third solenoid valve 22 is activated to apply high-pressure gas to the clamp valve 25, causing the clamp valve 25 to open to a large degree. As a result, the ultrafine dry powder is drawn into the powder filling chamber 261 in a large flow rate under vacuum, and the rough filling process begins.
[0057] Step 8: Under vacuum, the ultrafine dry powder is continuously drawn into the powder filling chamber 261 in large flow rate, and then enters the ultrafine dry powder fire extinguisher through the powder filling head 263. The measured value of the weighing device will gradually increase as the weight of the ultrafine dry powder drawn in increases.
[0058] Step 9: The difference between the actual measured value of the weighing device and the tare weight is recorded as the actual filling amount. When the actual filling amount reaches 80% of the target filling amount, the third solenoid valve 22 is reset and the second solenoid valve 21 is activated, which applies low-pressure gas to the pinch valve 25, causing the pinch valve 25 to open slightly. Thus, the ultrafine dry powder is drawn into the powder filling chamber 261 in a small flow rate under vacuum, and the precise filling process begins.
[0059] Step 10: Under vacuum, the ultrafine dry powder is successively drawn into the powder filling chamber 261 in small flow rates, and then enters the ultrafine dry powder fire extinguisher through the powder filling head 263. The measured value of the weighing device will continue to gradually increase as the weight of the ultrafine dry powder drawn in increases.
[0060] Step 11: The difference between the actual measured value of the weighing device and the tare weight is recorded as the actual filling amount. When the actual filling amount reaches 100% of the target filling amount, the second solenoid valve 21 is reset, the fourth solenoid valve 23 is activated, and atmospheric pressure is applied to the clamp valve 25, causing the clamp valve 25 to close and ending the precision filling process.
[0061] Step 12: The first solenoid valve 14 and the fifth solenoid valve 24 are reset, disconnecting the powder filling chamber 261, vacuum line 15, and vacuum tank 13. At the same time, the powder filling chamber 261 is connected to the atmosphere through the fifth solenoid valve 24. Under the action of the atmosphere, the powder filling chamber 261 and the ultra-fine dry powder fire extinguisher restore atmospheric pressure. At this time, there will be a large amount of air remaining in the ultra-fine dry powder fire extinguisher 3, which will result in the ultra-fine dry powder not being completely filled into the ultra-fine dry powder fire extinguisher 3. Therefore, there will be some dry powder remaining in the powder filling chamber 261.
[0062] Step 13: The first solenoid valve 14 and the fifth solenoid valve 24 are activated again to connect the powder filling chamber 261, the vacuum line 15, and the vacuum tank 13, thereby creating a second vacuum in the powder filling chamber 261 and the interior of the ultra-fine dry powder fire extinguisher, removing the residual air in the ultra-fine dry powder fire extinguisher 3, and then the residual ultra-fine dry powder in the powder filling chamber 261 will continue to be poured into the ultra-fine dry powder fire extinguisher 3.
[0063] Step 14: The first solenoid valve 14 and the fifth solenoid valve 24 are reset again, disconnecting the powder filling chamber 261, the vacuum line 15, and the vacuum tank 13. At the same time, the powder filling chamber 261 is reconnected to the atmosphere through the fifth solenoid valve 24. Under the action of the atmosphere, the residual ultrafine dry powder in the powder filling chamber 261 will be completely pressed into the ultrafine dry powder fire extinguisher.
[0064] Step 15: The lifting cylinder 274 lowers the tooling plate 273, thereby moving the ultrafine dry powder fire extinguisher downwards, causing the bottle mouth of the ultrafine dry powder fire extinguisher to separate from the powder filling head 263, thus completing an automated filling process.
[0065] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:
[0066] To achieve optimal fire extinguishing efficiency, ultrafine dry powder fire extinguishers have strict limitations on their filling volume, with an error typically ranging from 0% to 3% of the designed filling volume. Due to the small particle size and low bulk density of ultrafine dry powder, it is much lighter than ordinary dry powder and prone to suspension, making precise filling of ultrafine dry powder fire extinguishers quite difficult. This invention proposes an automated and precise filling device and method for ultrafine dry powder fire extinguishers, featuring high filling efficiency, high precision, and good product consistency. It can quickly meet the filling requirements of ultrafine dry powder fire extinguishers of different sizes and specifications, resulting in high production efficiency.
[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. An automated and precise filling device for ultrafine dry powder fire extinguishers, characterized in that, include: A vacuum system having a vacuum pump connected to a vacuum tank connected to a filling system; A filling system having a base, a weighing device on the base, a support at the upper end of the weighing device, a lifting cylinder in the support, a tooling plate at the upper end of the lifting cylinder, an ultrafine dry powder fire extinguisher at the upper end of the tooling plate, a powder filling head above the ultrafine dry powder fire extinguisher, the powder filling head being connected to a powder filling chamber, and the powder filling chamber being connected to the atmosphere, high-pressure gas, and low-pressure gas; A powder supply system, comprising a powder hopper connected to a powder filling chamber via a powder conveying pipeline; and A control system, which is connected to a vacuum system, a filling system, and a powder supply system, respectively. A one-way shut-off valve is provided between the vacuum tank and the vacuum pump, and a first solenoid valve and a fifth solenoid valve are provided between the vacuum tank and the powder filling chamber. The upper end of the powder filling cavity is provided with a clamping valve, which is connected to a second solenoid valve, a third solenoid valve and a fourth solenoid valve respectively. The control system includes a central controller, which is used to read the stable measurement values of the weighing device and record them as tare weight; During the filling process, the central controller controls the operation of the first and fifth solenoid valves to connect the powder filling chamber, vacuum pipeline and vacuum tank, thereby evacuating the powder filling chamber and the interior of the ultrafine dry powder fire extinguisher; at the same time, it controls the fourth solenoid valve to reset and the third solenoid valve to operate, so that high-pressure gas acts on the pinch valve, causing the pinch valve to open to a large degree, thereby allowing the ultrafine dry powder to be drawn into the powder filling chamber in a large flow rate under vacuum, for coarse filling; When the difference between the actual measured value of the weighing device and the tare weight reaches 80% of the target filling amount, the central controller is used to control the third solenoid valve to reset and the second solenoid valve to operate, so that the low-pressure gas acts on the pinch valve, causing the pinch valve to open slightly, thereby allowing the ultrafine dry powder to be drawn into the powder filling cavity in a small flow rate under vacuum for precise filling. When the difference between the actual measured value of the weighing device and the tare weight reaches 100% of the target filling amount, the central controller is used to control the second solenoid valve to reset and the fourth solenoid valve to operate, so that atmospheric pressure is applied to the pinch valve to close the pinch valve. The central controller is used to control the first and fifth solenoid valves to reset, disconnect the powder filling chamber, vacuum pipeline and vacuum tank, and allow the powder filling chamber to be connected to the atmosphere through the fifth solenoid valve. The central controller is used to control the first and fifth solenoid valves to operate again, reconnecting the powder filling chamber, vacuum pipeline and vacuum tank, thereby performing a second vacuuming inside the powder filling chamber and the ultra-fine dry powder fire extinguisher. The central controller is used to control the first and fifth solenoid valves to reset again, disconnect the powder filling chamber, vacuum pipeline and vacuum tank, and allow the powder filling chamber to reconnect to the atmosphere through the fifth solenoid valve, so that the residual ultrafine dry powder in the powder filling chamber is pressed into the ultrafine dry powder fire extinguisher.
2. The automated precision filling device for ultrafine dry powder fire extinguishers as described in claim 1, characterized in that, The powder conveying pipeline is equipped with a powder conveying pipeline support.
3. The automated precision filling device for ultrafine dry powder fire extinguishers as described in claim 1, characterized in that, The weighing device includes a first weighing sensor and a second weighing sensor, which are symmetrically arranged on the base.
4. The automated precision filling device for ultrafine dry powder fire extinguishers as described in claim 1, characterized in that, The support frame is equipped with a pneumatic vibrator, and the powder bucket is equipped with a stirring device.
5. The automated precision filling device for ultrafine dry powder fire extinguishers as described in claim 1, characterized in that, The vacuum tank is equipped with a vacuum pressure gauge.
6. The automated precision filling device for ultrafine dry powder fire extinguishers as described in claim 1, characterized in that, The powder filling chamber is equipped with a filter element.
7. A method of using an automated and precise filling device for ultrafine dry powder fire extinguishers, based on the automated and precise filling device for ultrafine dry powder fire extinguishers according to any one of claims 1-6, characterized in that, include: Step 1: Select the appropriate filling head according to the model and specifications of the ultra-fine dry powder fire extinguisher to be filled and install it at the bottom of the filling chamber; Step 2: The device is powered on, and the vacuum pump starts to draw a vacuum under the control of the central controller. The vacuum tank is evacuated through the one-way shut-off valve. At the same time, the stirring device in the powder bucket starts to operate and continuously disperses the ultrafine dry powder in the bucket. Step 3: Place the ultrafine dry powder fire extinguisher on the tooling plate; Step 4: Select the appropriate filling volume on the central controller and start the automatic filling operation; Step 5: The lifting cylinder lifts the tooling plate, thereby moving the ultra-fine dry powder fire extinguisher upward, so that the mouth of the ultra-fine dry powder fire extinguisher bottle is in close contact with the powder filling head and achieves a sealing effect. Step 6: The central controller reads the stable measurement value of the weighing sensor and records it as the tare weight; Step 7: The first and fifth solenoid valves are activated to connect the powder filling chamber, vacuum pipeline, and vacuum tank, thereby creating a vacuum inside the powder filling chamber and the ultrafine dry powder fire extinguisher. At the same time, the fourth solenoid valve is reset and the third solenoid valve is activated to apply high-pressure gas to the pinch valve, causing the pinch valve to open to a large degree. Thus, the ultrafine dry powder is drawn into the powder filling chamber in a large flow rate under vacuum, and the rough filling process begins. Step 8: Under vacuum, the ultrafine dry powder is continuously drawn into the powder filling chamber in large flow rate, and then enters the ultrafine dry powder fire extinguisher through the powder filling head. The measured value of the weighing device will gradually increase as the weight of the ultrafine dry powder drawn in increases. Step 9: The difference between the actual measured value of the weighing device and the tare weight is recorded as the actual filling amount. When the actual filling amount reaches 80% of the target filling amount, the third solenoid valve is reset and the second solenoid valve is activated, which applies low-pressure gas to the pinch valve, causing the pinch valve to open slightly. Thus, the ultrafine dry powder is drawn into the powder filling cavity in a small flow rate under vacuum, and the precise filling process begins. Step 10: Under vacuum, the ultrafine dry powder is successively drawn into the powder filling chamber in small flow rates, and then enters the ultrafine dry powder fire extinguisher through the powder filling head. The measured value of the weighing device will continue to gradually increase as the weight of the ultrafine dry powder drawn in increases. Step 11: The difference between the actual measured value of the weighing device and the tare weight is recorded as the actual filling amount. When the actual filling amount reaches 100% of the target filling amount, the second solenoid valve is reset, the fourth solenoid valve is activated, and atmospheric pressure is applied to the clamp valve to close it, thus ending the precise filling process. Step 12: The first and fifth solenoid valves are reset, disconnecting the powder filling chamber, vacuum pipeline, and vacuum tank. At the same time, the powder filling chamber is connected to the atmosphere through the fifth solenoid valve. Under the action of the atmosphere, the powder filling chamber and the ultra-fine dry powder fire extinguisher restore atmospheric pressure. At this time, there will be a large amount of air remaining in the ultra-fine dry powder fire extinguisher, which will result in the ultra-fine dry powder not being completely filled into the ultra-fine dry powder fire extinguisher. Therefore, there will be some dry powder residue in the powder filling chamber. Step 13: The first and fifth solenoid valves activate again, connecting the powder filling chamber, vacuum pipeline, and vacuum tank, thereby creating a second vacuum inside the powder filling chamber and the ultra-fine dry powder fire extinguisher, removing the residual air inside the ultra-fine dry powder fire extinguisher, and allowing the residual ultra-fine dry powder in the powder filling chamber to continue filling into the ultra-fine dry powder fire extinguisher. Step 14: The first and fifth solenoid valves are reset again, disconnecting the powder filling chamber, vacuum pipeline, and vacuum tank. At the same time, the powder filling chamber is reconnected to the atmosphere through the fifth solenoid valve. Under the action of the atmosphere, the remaining ultrafine dry powder in the powder filling chamber will be completely pressed into the ultrafine dry powder fire extinguisher. Step 15: The lifting cylinder lowers the tooling plate, thereby moving the ultrafine dry powder fire extinguisher downwards, causing the bottle mouth of the ultrafine dry powder fire extinguisher to separate from the powder filling head. This completes one automated filling process.