A dust-free automatic precise feeding system and method

Abstract

The present invention belongs to the field of powder raw material processing, and specifically discloses a dust-free automatic precise feeding system and method, which includes a vibrating feeding device, a dust-free feeding device, a bracket and a control device, wherein the vibrating feeding device includes a vibrating barrel, a vibrator, a spring and a reduction weighing module, the vibrating barrel is fixed on the vibrator, the vibrator is fixed on the reduction weighing module through a spring, and the reduction weighing module is placed on the bracket; the dust-free feeding device includes a soft connection, a flow control valve, a labyrinth sealing assembly, a hopper and an incremental weighing module, the upper end of the flow control valve is fixed on the bracket, and is connected to the vibrating barrel discharge port through a soft connection, and the lower end is connected to the hopper through a labyrinth sealing assembly, and the hopper is placed on the incremental weighing module; the control device is connected to the vibrator, the reduction weighing module, the flow control valve, the labyrinth sealing assembly and the incremental weighing module. The system realizes automatic precise feeding and solves the problems of static electricity and dust.

Description

Technical Field

[0001] The present invention belongs to the field of powder raw material processing, and more specifically, relates to a dust-free automatic precise feeding system and method, especially for the automatic precise feeding of energetic powders with poor fluidity. Background Art

[0002] Since energetic powders are highly dangerous, they can easily explode due to friction, impact and static electricity during the feeding process, causing great harm to human life and property safety. Therefore, during the production process, it is necessary to minimize the friction and extrusion of the powders to prevent static electricity; it is also necessary to control dust to reduce the pollution of the environment by the powders; in addition, it is necessary to isolate humans and machines to achieve automated remote operation. The batching accuracy of the energetic material weighing and batching system is an important criterion for the feeding system, but due to the adhesion and cohesion between the powder particles, the powders are prone to agglomeration. Therefore, during the feeding process, arches often appear, blocking the silo, resulting in the inability of the powder to be fed downward continuously and evenly, causing "bridging and breaking of the material". In general, due to the characteristics of energetic powders, the feeding process is highly dangerous and the feeding accuracy is difficult to guarantee.

[0003] At present, the commonly used powder weighing batching systems include hopper gravity discharging device, electronic belt scale discharging device, spiral discharging device, vibration discharging device, etc. The hopper gravity discharging is that the powder relies on its own weight and directly enters the receiving device below from the discharging port. The discharging amount is controlled by controlling the opening of the discharging port valve body. This method has a simple structure, but the control accuracy of the valve cannot be guaranteed due to the agglomeration of the powder. If the discharging port is blocked and the feeding is stopped, it is necessary to use manual knocking or pounding to clear the discharging port, which not only affects the production efficiency, but also poses a safety hazard. The spiral discharging device refers to the screw that rotates under the drive of an external force, and the powder enters the spiral gap on the screw, and the powder is transported as the screw rotates. The spiral method has a fast feeding speed, the feeder is easy to manufacture, the installation is simple and convenient, the feeding process is controllable, and it is suitable for a variety of powders, including powders with poor fluidity, but due to the instability of the filling factor, the feeding system has poor stability; in addition, when the spiral device rotates, it is easy to form a large friction and extrusion stress in the gap, which causes safety hazards. The electronic belt scale type discharging device has an electronic belt scale under the silo. The silo discharges the material onto the belt scale. The belt scale weighs the discharge quality and feeds back to the discharge mechanism to control the speed of the batching. The electronic belt scale type weighing batching system does not bear force on the powder, and the belt uses antistatic material, so it is safer. However, in order to solve the dust problem, the belt is placed in a dustproof cover. The mechanism in the dustproof cover is complex and there is still a lot of dust accumulation. This method is only suitable for places with a large batching range and low precision requirements. Vibration conveying discharging refers to the reciprocating motion of the vibrating feeder under the action of a vibration motor, electromagnetic or pneumatic to achieve the throwing movement of the powder. This method does not squeeze the powder and has good safety, but the accuracy is poor for powders with poor fluidity and easy agglomeration. Summary of the invention

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a dust-free automatic and precise feeding system and method, which includes a vibration feeding device, a dust-free feeding device, a bracket and a control device, and completes dust-free automatic and precise feeding through the cooperation between various parts. The whole process is automated, does not require human participation, and solves the problems of static electricity and dust in the feeding process.

[0005] To achieve the above object, according to one aspect of the present invention, a dust-free automatic precision feeding system is proposed, comprising a vibrating feeding device, a dust-free feeding device, a bracket and a control device, wherein:

[0006] The vibrating feeding device comprises a vibrating barrel, a vibrator, a spring and a weight loss weighing module. The vibrating barrel is fixed on the vibrator, and one end of the vibrating barrel is provided with a feed port, and the other end of the vibrating barrel is provided with a discharge port. The vibrator is fixed on the weight loss weighing module through the spring, and the weight loss weighing module is placed on the bracket.

[0007] The dust-free feeding device comprises a flexible connection, a flow control valve, a labyrinth sealing assembly, a hopper and an incremental weighing module, wherein the upper end of the flow control valve is fixed to the bracket and connected to the discharge port through the flexible connection, and the lower end is connected to the hopper through the labyrinth sealing assembly, and the hopper is placed on the incremental weighing module;

[0008] The control device is connected to the vibrator, the reduction weighing module, the flow control valve, the labyrinth seal assembly and the increment weighing module.

[0009] As a further preferred embodiment, the labyrinth seal assembly includes a labyrinth seal flange, a labyrinth seal flexible connection, a labyrinth seal upper part and a labyrinth seal lower part, wherein the labyrinth seal flange is fixed to the lower end of the flow control valve and a cylinder is mounted thereon; the labyrinth seal upper part is connected to the labyrinth seal flange through a labyrinth seal flexible connection; and the labyrinth seal lower part is fixed on the hopper.

[0010] As a further preference, the flexible connection and the labyrinth sealing flexible connection are made of antistatic rubber or antistatic cloth.

[0011] As a further preference, a powder breaking structure is provided in the vibrating barrel.

[0012] As further preferred, the powder scattering structure is a needle-shaped powder scattering structure or a mesh-shaped powder scattering structure.

[0013] As a further preference, the vibrating barrel and the powder breaking structure are both made of metal.

[0014] As a further preference, the vibrator is provided with a dust cover.

[0015] According to another aspect of the present invention, a dust-free automatic precise feeding method is proposed, which is implemented by the above system and comprises the following steps:

[0016] The S1 vibrator drives the vibration barrel to vibrate, so that the powder in the vibration barrel enters the hopper from the discharge port through the soft connection, flow control valve and labyrinth seal assembly in sequence;

[0017] S2 uses the reduction weighing module to detect the reduced mass of the powder in the vibrating barrel in real time, and uses the increment weighing module to detect the increased mass of the powder in the hopper in real time. If the two masses are consistent, the system continues to work. If the two masses are inconsistent, the system stops to check and eliminate the faults, and then re-perform S1;

[0018] S3 When the added mass of powder in the hopper reaches the target discharge amount, turn off the vibrator and flow control valve, open the labyrinth seal assembly, and remove the hopper to complete the feeding.

[0019] In general, the above technical solution conceived by the present invention has the following technical advantages compared with the prior art:

[0020] 1. The feeding process of the present invention is fully automated, and accurate feeding can be completed without human intervention. At the same time, different from spiral feeding, the present invention adopts a vibration feeding method, and there is no extrusion of powder during the process, eliminating static interference.

[0021] 2. The dust-free feeding device in the present invention is fully sealed and does not affect the weighing of the added amount: a soft connection is used between the vibrating barrel and the flow control valve, and the flow control valve is fixed on the bracket to ensure that except for the mass of the powder in the vibrating barrel, the rest has no effect on the reduction weighing module; a labyrinth seal is used between the hopper and the flow control valve, which on the one hand solves the problem of sealing dust, and on the other hand ensures that except for the mass of the powder in the hopper, the rest has no effect on the incremental weighing module, thereby improving the weighing accuracy of the powder in the hopper.

[0022] 3. The labyrinth seal assembly in the present invention is controlled by a cylinder with position monitoring. After it is lowered into place, it automatically feeds back to the control device to start feeding. The control device controls the opening and closing of the flow control valve and the start and stop of the vibration feeder. After the target feeding amount is reached, the system automatically stops feeding, and the cylinder drives the upper and lower parts of the labyrinth seal to disengage, and the hopper is removed.

[0023] 4. In order to solve the problem of decreased vibration feeding accuracy and stability caused by agglomeration due to adhesion and cohesion between powder particles with poor fluidity, a powder breaking structure is added so that the vibration feeding device can accurately and stably discharge the materials. When the agglomerated powder passes through, on the one hand, it is broken up by the blocking effect on it, and on the other hand, the powder breaking structure will produce one or more order resonances under the vibration of the vibration barrel, and the agglomerated powder will be further broken up by vibration, thereby improving the feeding accuracy of the vibration device.

[0024] 5. The vibrating barrel and powder breaking structure are made of metal and are reliably grounded to prevent the dangerous accumulation of static electricity caused by vibration.

[0025] 6. During the feeding process, the incremental weighing module weighs the increased mass of the powder in the hopper, and the subtractive weighing module weighs the reduced mass of the powder in the vibrating barrel. The two are cross-checked to obtain the actual feeding amount, and the feeding rate is controlled by controlling the opening of the flow control valve, the amplitude and frequency of the vibrator, so as to achieve real-time and precise control of the feeding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is an overall schematic diagram of the dust-free automatic precision feeding system of the present invention;

[0027] Figure 2 A partial cross-sectional view of a labyrinth seal assembly of the present invention;

[0028] Figure 3 This is a schematic diagram of the needle-shaped powder breaking structure of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure for breaking up the mesh powder of the present invention;

[0030] Figure 5 This is a flow chart of the dust-free automatic and precise feeding method of the present invention.

[0031] In all the drawings, the same figure numbers are used to represent the same elements or structures, among which: 1-feed port, 2-vibrator, 3-dust cover, 4-spring, 5-reduction weighing module, 6-bracket, 7-control device, 8-incremental weighing module, 9-hopper, 10-labyrinth seal assembly, 11-flow control valve, 12-flexible connection, 13-discharge port, 14-vibrating barrel, 15-cylinder, 16-labyrinth seal flange, 17-labyrinth seal flexible connection, 18-labyrinth seal lower part, 19-labyrinth seal upper part, 20-needle-shaped powder breaking structure, 21-mesh powder breaking structure. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] The embodiment of the present invention provides a dust-free automatic precision feeding system, such as Figure 1 As shown, it includes a vibrating feeding device, a dust-free feeding device, a bracket 6 and a control device 7, wherein:

[0034] The vibrating feeding device comprises a vibrating barrel 14, a vibrator 2, a spring 4 and a weight loss weighing module 5. The vibrating barrel 14 is arranged horizontally or tilted and fixed on the vibrator 2. One end of the vibrating barrel 14 is provided with a feed port 1, and the other end is provided with a discharge port 13. The vibrator 2 is fixed to the weight loss weighing module 5 through the spring 4. The vibrator 2 comprises a vibration driver and a leaf spring. The vibration power is provided by a vibration motor, pneumatic or electromagnetic. Preferably, a dust cover 3 is provided outside the vibrator 2. The weight loss weighing module 5 is placed on a bracket 6.

[0035] The dust-free feeding device includes a flexible connection 12, a flow control valve 11, a labyrinth seal assembly 10, a hopper 9 and an incremental weighing module 8, wherein the upper end of the flow control valve 11 is fixed to the bracket 6 through a flange, and is connected to the discharge port 13 through the flexible connection 12, so as to ensure that the remaining parts except the quality of the powder in the vibrating barrel have no effect on the reduction weighing device 5; the lower end of the flow control valve 11 is connected to the hopper 9 through the labyrinth seal assembly 10, and the hopper 9 is installed on the incremental weighing module 8;

[0036] Specifically, Figure 2 As shown, the labyrinth seal assembly 10 includes a labyrinth seal flange 16, a labyrinth seal flexible connection 17, a labyrinth seal upper part 19 and a labyrinth seal lower part 18, wherein the labyrinth seal flange 16 is fixed to the lower end of the flow control valve 11 by bolts, and a cylinder 15 is installed thereon, the labyrinth seal upper part 19 is connected to the labyrinth seal flange 16 by the labyrinth seal flexible connection 17, and the labyrinth seal lower part 18 is fixed on the hopper 9; when working, the cylinder 15 can drive the labyrinth seal upper part 19 to move along the axial direction of the dust-free feeding device, and the staggered gap formed by the labyrinth seal upper part 19 and the labyrinth seal lower part 18 can play a role of dustproof sealing on the one hand, and isolate the hopper 9 from other devices on the other hand, so that the incremental weighing module 8 can accurately measure the mass of the powder in the hopper 9 in real time during the feeding process;

[0037] The control device 7 is connected to the vibrator 2, the reduction weighing module 5, the flow control valve 11, the labyrinth seal assembly 10 and the incremental weighing module 8. The control device 7 can control the material discharge rate by adjusting the opening of the flow control valve 11, the amplitude and frequency of the vibrator 2.

[0038] Furthermore, in order to solve the problem of decreased vibration feeding accuracy and stability caused by agglomeration due to adhesion and cohesion between powder particles with poor fluidity, powder dispersing structures are arranged in a staggered manner in the vibration barrel 14, so that the vibration feeding device can accurately and stably discharge materials; when the agglomerated powder passes through, on the one hand, it is dispersed by the blocking effect on it, and on the other hand, the powder dispersing structure will produce one-order or multi-order resonance under the vibration of the vibration barrel 14, and the agglomerated powder will be further dispersed by vibration, thereby improving the feeding accuracy of the vibration device; Figure 3 and Figure 4 As shown, the powder scattering structure is a needle-shaped powder scattering structure 20 or a mesh-shaped powder scattering structure 21; the vibrating barrel 14 and the powder scattering structure are both made of metal and are reliably grounded to prevent the danger of vibration static electricity accumulation.

[0039] Furthermore, the flexible connection 12 and the labyrinth seal flexible connection 17 are made of antistatic rubber or antistatic cloth; and the flow control valve 11 is a pneumatic hose valve or a pneumatic butterfly valve.

[0040] The above system is used for feeding, such as Figure 5 As shown, the specific steps include:

[0041] S1 powder is loaded into the vibrating barrel 14 from the feed port 1, the cylinder 15 controls the labyrinth seal upper part 19 to descend to the position, the control device 7 opens the flow control valve 11, and starts the vibrator 2; the vibrator 2 drives the vibrating barrel 14 to vibrate, so that the powder in the vibrating barrel 14 enters the hopper 9 from the discharge port 13 through the flexible connection 12, the flow control valve 11 and the labyrinth seal assembly 10 in sequence;

[0042] S2 detects the reduced mass of the powder in the vibrating barrel 14 in real time through the reduction weighing module 5, and detects the increased mass of the powder in the hopper 9 in real time through the increment weighing module 8. If the two masses are consistent, the system continues to work. If the two masses are inconsistent, the system stops to check and eliminate the fault and then re-performs S1;

[0043] S3 When the increased mass of powder in the hopper 9 reaches the target discharge amount, the control device 7 turns off the vibrator 2 and the flow control valve 11, the cylinder 15 controls the lower part 19 of the labyrinth seal to rise to the position, and the hopper 9 is removed to complete the feeding.

[0044] Specifically, when the system just starts working, the actual material discharge amount is quite different from the target material discharge amount. At this time, the opening of the flow control valve 11 is increased or the amplitude and frequency of the vibrator 2 are increased to increase the material discharge rate, thereby improving production efficiency; when the actual material discharge amount is close to the target material discharge amount, the opening of the flow control valve 11 is reduced or the amplitude and frequency of the vibrator 2 are reduced to reduce the material discharge rate and improve the material discharge accuracy until the error requirement is met between the actual material discharge amount and the target material discharge amount.

[0045] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dust-free automatic precise feeding method, characterized in that: The method is implemented by using a dust-free automatic precise feeding system, the dust-free automatic precise feeding system comprising a vibrating feeding device, a dust-free feeding device, a bracket (6) and a control device (7), wherein: The vibrating feeding device comprises a vibrating barrel (14), a vibrator (2), a spring (4) and a weight loss weighing module (5); the vibrating barrel (14) is fixed on the vibrator (2), one end of which is provided with a feed port (1) and the other end of which is provided with a discharge port (13); the vibrator (2) is fixed on the weight loss weighing module (5) via the spring (4), and the weight loss weighing module (5) is placed on the bracket (6); The dust-free feeding device comprises a flexible connection (12), a flow control valve (11), a labyrinth sealing assembly (10), a hopper (9) and an incremental weighing module (8); the upper end of the flow control valve (11) is fixed to the bracket (6) and connected to the discharge port (13) via the flexible connection (12); the lower end is connected to the hopper (9) via the labyrinth sealing assembly (10); the hopper (9) is placed on the incremental weighing module (8); the labyrinth sealing assembly The component (10) comprises a labyrinth seal flange (16), a labyrinth seal flexible connection (17), a labyrinth seal upper part (19) and a labyrinth seal lower part (18), wherein the labyrinth seal flange (16) is fixed to the lower end of the flow control valve (11) and a cylinder (15) is mounted thereon; the labyrinth seal upper part (19) is connected to the labyrinth seal flange (16) via the labyrinth seal flexible connection (17); and the labyrinth seal lower part (18) is fixed to the hopper (9); The control device (7) is connected to the vibrator (2), the reduction weighing module (5), the flow control valve (11), the labyrinth seal assembly (10) and the incremental weighing module (8); The dust-free automatic precision feeding method includes the following steps: The S1 vibrator (2) drives the vibrating barrel (14) to vibrate, so that the powder in the vibrating barrel (14) enters the hopper (9) from the discharge port (13) through the flexible connection (12), the flow control valve (11) and the labyrinth seal assembly (10) in sequence; S2 detects the reduced mass of the powder in the vibrating barrel (14) in real time through the reduction weighing module (5), and detects the increased mass of the powder in the hopper (9) in real time through the increment weighing module (8). If the two masses are consistent, the system continues to work. If the two masses are inconsistent, the system stops to check and eliminate the fault, and then performs S1 again; S3 When the added mass of powder in the hopper (9) reaches the target discharge amount, the vibrator (2) and the flow control valve (11) are turned off, the labyrinth seal assembly (10) is opened, and the hopper (9) is removed to complete the feeding.

2. The dust-free automatic precise feeding method according to claim 1, characterized in that: The flexible connection (12) and the labyrinth seal flexible connection (17) are made of antistatic rubber or antistatic cloth.

3. The dust-free automatic precise feeding method according to claim 1, characterized in that: A powder dispersing structure is arranged in the vibrating barrel (14).

4. The dust-free automatic precise feeding method according to claim 3, characterized in that: The powder dispersing structure is a needle-shaped powder dispersing structure (20) or a mesh-shaped powder dispersing structure (21).

5. The dust-free automatic precise feeding method according to claim 1, characterized in that: The vibrating barrel (14) and the powder dispersing structure are both made of metal.

6. The dust-free automatic precise feeding method according to claim 1, characterized in that: The vibrator (2) is provided with a dust cover (3) outside.

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