Vibrating screen for milk powder production

Abstract

The utility model belongs to the technical field of milk powder production equipment, and particularly relates to a vibrating screen for milk powder production. Comprising a vibrating screen body and a screening assisting assembly, the screening assisting assembly comprises an air purifying assembly and an air inlet pipe, one end of the air inlet pipe is connected with the air purifying assembly, the other end of the air inlet pipe is provided with an air blowing device, and the air blowing device is arranged at the end, away from a feeding port, of the vibrating screen body and located in the vibrating screen body; and the blowing direction of the blowing device faces the feeding hole. When the vibrating screen works, milk powder from a fluidized bed of a drying tower enters the vibrating screen body, clean air purified by the air purification assembly is blown into the vibrating screen body through the blowing device and forms certain convection with airflow of the feeding port, and the screening time of the milk powder in the vibrating screen is prolonged; and the problem that part of fine powder is pushed to the slag discharging opening along with the block mass particles before being fully screened, so that the fine powder is wasted is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of milk powder production equipment, in particular to a vibrating screen for milk powder production. Background Art

[0002] During the production process of various types of milk powder, protein powder, and formula powder, in order to ensure the uniformity of product texture and the applicability in subsequent use, vibrating screens are often required to remove uneven powder particles formed due to physical factors during the production process. During the vibration of the vibrating screen, fine powder falls through the small holes on the screen and is collected or transported to the powder bin, while large particles of powder that form clumps are trapped on the surface of the screen and then pushed to the granular powder discharge port for discharge as the screen vibrates. Although vibrating screens are widely used in industrial applications, they still have some significant problems in actual production operations, such as:

[0003] Fine powder waste: During the screening process, some fine powder may not fully pass through the screen and be pushed to the slag outlet along with the agglomerates, resulting in the loss of fine powder and the waste of raw materials. Recovering this part of the fine powder requires very high microbial control requirements and increases labor and energy costs.

[0004] Screen clogging: During the production process, powder continuously enters the vibrating screen. Because vibration alone is not fast enough to sieve fine powder, the screen is easily clogged during use, especially when the mesh size is small. This clogging reduces screening efficiency and becomes more serious with use, causing more normal fine powder to be transported to the slag outlet that collects bulk powder.

[0005] In the prior art, Chinese utility model patent application number CN202023017941.6 discloses a novel vibrating screen and milk powder production system. This utility model discloses a novel vibrating screen and milk powder production system. The novel vibrating screen includes a bracket, a shock-absorbing assembly, a vibrating device, a screen body, a spray cleaning unit, and a cleaning medium pumping unit. One end of the shock-absorbing assembly is disposed on the bracket, the screen body is disposed on the other end of the shock-absorbing assembly, the vibrating device is disposed on the screen body, a screen is disposed within the screen body, a feed port is disposed on the top wall of the screen body, and at least one discharge port is disposed on the bottom wall of the screen body. The screen is disposed between the feed port and the discharge port. The spray cleaning unit is disposed on at least one side of the screen body and is connected to the cleaning medium pumping unit. The spray cleaning unit includes at least one telescopic nozzle, the nozzle of which is directed toward the screen. This application solution uses the spray cleaning unit to flush the screen (when the machine is stopped), which to some extent alleviates the problem of screen clogging and cleaning. However, there is still a problem that some fine powder is pushed to the slag discharge port along with the agglomerates before being fully screened, resulting in a waste of fine powder. Summary of the Invention

[0006] Based on this, the present application provides a vibrating screen for milk powder production to solve the technical problem in the prior art that some fine powder is pushed to the slag discharge port along with the agglomerates before it has time to undergo sufficient screening, resulting in waste of fine powder.

[0007] The technical solutions to the above technical problems are as follows:

[0008] A vibrating screen for milk powder production, comprising:

[0009] A vibrating screen body, wherein the vibrating screen body is provided with a feed port;

[0010] A screening aid component includes an air purification component and an air intake pipe. One end of the air intake pipe is connected to the air purification component, and the other end is provided with a blowing device. The blowing device is arranged at one end of the vibrating screen body away from the feed port and is located inside the vibrating screen body. The blowing direction of the blowing device is toward the feed port.

[0011] Preferably, the vibrating screen for milk powder production is provided with a screen in its body, the working surface of the screen is perpendicular to the feeding direction of the feed port, and the blowing device is higher than the screen.

[0012] Preferably, the above-mentioned vibrating screen for milk powder production is characterized in that a fine powder discharge pipe is provided at one end of the vibrating screen body away from the feed port, and the fine powder discharge pipe is used to discharge the fine powder sieved by the screen out of the vibrating screen body.

[0013] Preferably, the above-mentioned vibrating screen for milk powder production is provided with a slag discharge pipe at one end of the vibrating screen body away from the feed port, the blowing device is located above the slag discharge pipe, and the blowing direction of the blowing device is away from the slag discharge pipe, and the slag discharge pipe is used to discharge the coarse particles intercepted by the screen from the vibrating screen body.

[0014] Preferably, in the above-mentioned vibrating screen for milk powder production, the slag discharge pipe is provided with an exhaust pipe, and the inlet of the exhaust pipe is provided with a filter screen.

[0015] Preferably, in the above-mentioned vibrating screen for milk powder production, the blowing device is a horizontally arranged blowing pipe, and a plurality of first blowing ports are opened on the blowing pipe along the length direction, and the first blowing ports face the feed port.

[0016] Preferably, in the above-mentioned vibrating screen for milk powder production, the end of the blowing device facing the feed inlet is a flared end, and a plurality of second blowing ports are arranged in an array on the end face of the flared end, and the second blowing ports face the feed inlet.

[0017] Preferably, in the above-mentioned vibrating screen for milk powder production, the air purification component includes a water and oil removal device, a primary filtration device and a fine filtration device which are sequentially arranged along the air intake direction.

[0018] Preferably, in the above-mentioned vibrating screen for milk powder production, a regulating valve is provided on the air inlet pipe, and the regulating valve is located between the air purification component and the blowing device, and is located outside the vibrating screen body.

[0019] The above technical solution has at least the following beneficial effects:

[0020] The present application discloses a vibrating screen for milk powder production (hereinafter referred to as the vibrating screen), comprising a vibrating screen body and a screening aid assembly. The screening aid assembly includes an air purification assembly and an air inlet pipe. One end of the air inlet pipe is connected to the air purification assembly, and the other end is provided with a blowing device. The blowing device is disposed at an end of the vibrating screen body away from the feed inlet and is located within the vibrating screen body, with the blowing direction of the blowing device facing the feed inlet. During operation, milk powder from the fluidized bed in the drying tower enters the vibrating screen body. Clean air purified by the air purification assembly is blown into the vibrating screen body through the blowing device, forming a certain convection with the airflow from the feed inlet. This prolongs the screening time of the milk powder within the vibrating screen body and prevents some fine powder from being pushed to the slag discharge port along with the agglomerates before it has been fully screened. Furthermore, the air pressure of the blowing device is lower than the air pressure at the feed inlet, which ensures that the milk powder is fully screened while not affecting the normal operation of the vibrating screen. Furthermore, the clean air blown into the vibrating screen body can also prevent clogging of the screen mesh to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a main view of the internal structure of a vibrating screen for milk powder production in this application.

[0022] Figure 2 This is a schematic diagram of a blowing device in a specific embodiment of the present application.

[0023] Figure 3 This is a schematic diagram of a blowing device in another specific embodiment of the present application.

[0024] Figure 4 This is a schematic diagram of the second air outlet in another specific embodiment of the present application.

[0025] In the figure: vibrating screen body 100, feed port 110, screen 120, fine powder discharge pipe 130, slag discharge pipe 140, exhaust pipe 141, filter 142, air purification component 210, water and oil removal device 211, primary filtration device 212, fine filtration device 213, air inlet pipe 220, blowing device 230, blowing pipe 240, first blowing port 241, flared end 250, second blowing port 251, regulating valve 260. DETAILED DESCRIPTION

[0026] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to facilitate a more thorough and comprehensive understanding of the disclosure of the present invention.

[0027] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," "top," "bottom," "bottom end," "top end," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended solely for the purpose of describing specific embodiments and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] See Figures 1 to 4 In a specific embodiment of the present application,

[0030] A vibrating screen for milk powder production, comprising:

[0031] The vibrating screen body 100 is provided with a feed port 110. In the prior art, when the vibrating screen body 100 is in operation, milk powder from the fluidized bed of the drying tower enters the vibrating screen body 100 through the feed port 110. When the milk powder comes into contact with the screen inside the vibrating screen body 100 (hereinafter referred to as the inner screen 120), the horizontal vibration of the screen 120 separates the fine powder, while the agglomerates and some large particles in the milk powder are trapped. The trapped agglomerates and large particles are then pushed to the discharge pipe 140 for discharge due to the horizontal vibration of the screen 120. However, some fine powder may not be fully screened and is pushed to the discharge pipe 140 along with the agglomerates, resulting in waste.

[0032] Therefore, the vibrating screen for milk powder production disclosed in the present application also includes a screening aid assembly, the main function of which is to promote sufficient screening of milk powder in the vibrating screen body 100, so that fine powder can be screened out instead of being discharged from the slag discharge pipe 140. The screening aid assembly includes an air purification assembly 210 and an air inlet pipe 220. One end of the air inlet pipe 220 is connected to the air purification assembly 210, and the other end is provided with a blowing device 230. The blowing device 230 is provided at an end of the vibrating screen body 100 away from the feed port 110 and is located inside the vibrating screen body 100. The blowing direction of the blowing device 230 is toward the feed port 110.

[0033] The main working process of the screening aid assembly is as follows: air is purified into clean air through the air purification assembly 210, and then blown into the interior of the vibrating screen body 100 through the blowing device 230 via the air inlet pipe 220. Since the screening aid assembly is arranged at the end away from the feed port 110, that is, the clean air blown in by the blowing device 230 is opposite to the air flow direction of the feed port 110, forming convection. Under the action of this convection, the screening time of milk powder in the vibrating screen body 100 is extended, and the fine powder can be fully screened. If the air pressure blown into the vibrating screen body 100 by the blowing device 230 is higher than the air flow pressure of the fluidized bed input into the vibrating screen body 100 (that is, the feed air pressure of the feed port 110), then it will cause the milk powder to flow back to the fluidized bed, seriously affecting the normal production operation of the equipment. In actual use, the wind pressure blown into the vibrating screen body 100 by the blowing device 230 is lower than the air flow pressure of the fluidized bed input into the vibrating screen body 100. In this way, the milk powder can be fully screened while the entire air flow can flow to the slag discharge end, which will not affect the normal screening and slag discharge work of the vibrating screen.

[0034] In the vibrating screen body 100, separating fine powder from coarse powder requires the screen 120. Therefore, the vibrating screen body 100 is further provided with the screen 120, with its working surface perpendicular to the feed direction of the feed inlet 110. The blowing device 230 is higher than the screen 120. The vibrating screen body 100 primarily screens milk powder through the screen 120, and screens 120 of varying mesh sizes can be selected based on actual needs. If the air blown in by the blowing device 230 is lower than the screen 120, the airflow will not reach the unscreened milk powder, preventing the milk powder from being fully screened. Therefore, the blowing device 230 should be higher than the screen 120. This provides a sufficient amount of airflow when the milk powder is not in contact with the screen 120, creating convection with the airflow from the feed inlet 110, allowing the unscreened milk powder to circulate within the vibrating screen body 100, thereby appropriately extending the screening time and ensuring sufficient screening of the milk powder.

[0035] The milk powder sieved by the vibrating screen body 100 is divided into fine powder and coarse powder and needs to be discharged through different discharge pipes. Therefore, a fine powder discharge pipe 130 is provided at one end of the vibrating screen body 100 away from the feed port 110. The fine powder discharge pipe 130 is used to discharge the fine powder sieved by the screen 120 out of the vibrating screen body 100.

[0036] Similarly, the coarse powder must also be discharged in time to avoid blockage. A slag discharge pipe 140 is provided at one end of the vibrating screen body 100 away from the feed port 110. The blowing device 230 is located above the slag discharge pipe 140, and the blowing direction of the blowing device 230 is away from the slag discharge pipe 140. The slag discharge pipe 140 is used to discharge the coarse particles intercepted by the screen 120 out of the vibrating screen body 100. The coarse powder in the milk powder, that is, the lumps and some large particles of powder are retained above the working surface of the screen 120, and then pushed to the slag discharge pipe 140 for discharge as the screen 120 vibrates horizontally. It is worth noting that, on the one hand, if the blowing direction of the blowing device 230 is the same as the feed air flow direction of the feed port 110, then convection cannot be formed, and the purpose of extending the screening time of the milk powder in the vibrating screen body 100 cannot be achieved. On the other hand, if the blowing direction of the blowing device 230 is toward the discharge pipe 140, it will accelerate the flow of coarse powder toward the discharge pipe 140, and will not achieve the purpose of appropriately extending the screening time to fully screen the milk powder. Therefore, the blowing direction of the blowing device 230 needs to be directed toward the feed inlet 110 while also away from the discharge pipe 140. This will form a countercurrent with the feed airflow from the feed inlet 110 and will not accelerate the flow of coarse powder toward the discharge pipe 140, thereby achieving the purpose of fully screening the milk powder.

[0037] Furthermore, the slag discharge pipe 140 is provided with an exhaust pipe 141, and a filter 142 is provided at the inlet of the exhaust pipe 141. The air flowing into the slag discharge pipe 140 is discharged through the exhaust pipe 141. However, in order to prevent some coarse materials from clogging the exhaust pipe 141, a filter 142 is provided at the inlet of the exhaust pipe 141 to avoid clogging the exhaust pipe 141 and affecting the normal operation of the vibrating screen.

[0038] In a specific embodiment of the present application, the blowing device 230 is a horizontally arranged blowing pipe 240, and a plurality of first blowing ports 241 are opened along the length direction of the blowing pipe 240, and the first blowing ports 241 face the feed inlet 110. In order to obtain a larger airflow coverage area, the length of the blowing pipe 240 is preferably greater than or equal to the width of the screen 120, and a plurality of first blowing ports 241 are opened along the length direction of the blowing pipe 240. This allows the blown air to act evenly on the entire cross-section of the vibrating screen body 100. At the same time, an appropriate amount of airflow acts on the screen 120, which can also prevent the screen 120 from being blocked.

[0039] In order to make the clean air blown out by the blowing device 230 more evenly distributed throughout the interior of the vibrating screen body 100, so that the milk powder can be more fully screened, in another specific embodiment of the present application, the end of the blowing device 230 facing the feed inlet 110 is a flared end 250, and the end surface of the flared end 250 (that is, the end surface of the blowing device 230 facing the feed inlet 110) is provided with a plurality of flared end surfaces 250 in an array, and the second blowing port 251 faces the feed inlet 110. The shape of the end surface of the flared end 250 can be circular, rectangular, etc., and is selected according to actual working conditions and is not specifically limited here. A plurality of second blowing ports 251 are provided in an array on the end surface of the flared end 250, and the clean air enters the interior of the vibrating screen body 100 through the end surfaces of these small second blowing ports 251, making the blown airflow more uniform, which is conducive to the full screening of the milk powder inside the vibrating screen body 100. At the same time, it can also play the same role as described above, that is, an appropriate amount of airflow acts on the screen 120, and can also prevent the screen 120 from being blocked.

[0040] Since milk powder is a food product, strict food hygiene requirements must be met during its production and processing. Therefore, in a preferred embodiment, the air purification assembly 210 includes a water and oil removal device 211, a primary filter 212, and a fine filter 213, which are sequentially arranged along the air intake direction. The air is purified by the water and oil removal device 211, the primary filter 212, and the fine filter 213 into clean air (sterile air) that meets actual food hygiene requirements before it can be transported into the vibrating screen body 100 to come into contact with the milk powder.

[0041] As mentioned above, if the wind pressure blown into the vibrating screen body 100 by the blowing device 230 is higher than the air flow pressure of the fluidized bed input into the vibrating screen body 100 (i.e., the feed air pressure of the feed port 110), then the milk powder will flow back to the fluidized bed, seriously affecting the normal production operation of the equipment. Therefore, the wind pressure blown into the vibrating screen body 100 by the blowing device 230 should be lower than the air flow pressure of the fluidized bed input into the vibrating screen body 100, and the wind pressure blown into the vibrating screen body 100 by the blowing device 230 should be adjustable. Therefore, a regulating valve 260 is provided on the air inlet pipe 220. The regulating valve 260 is located between the air purification component 210 and the blowing device 230, and is located outside the vibrating screen body 100, so as to adjust the air volume and wind speed blown in by the blowing device 230 to adapt to the wind pressure requirements under different working conditions. That is, according to different feed air pressures, the wind pressure (sterile air pressure) blown into the vibrating screen body 100 by the blowing device 230 is adjusted to ensure that the wind pressure blown into the vibrating screen body 100 by the blowing device 230 is lower than the feed air pressure, so as to ensure that the milk powder is fully screened without affecting the normal operation of the vibrating screen.

[0042] Obviously, the above embodiments of the present application are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A vibrating screen for milk powder production, characterized in that: include: A vibrating screen body, wherein the vibrating screen body is provided with a feed port; A screening aid component includes an air purification component and an air intake pipe, one end of the air intake pipe is connected to the air purification component, and the other end is provided with a blowing device, the blowing device is arranged at the end of the vibrating screen body away from the feed port, and is located inside the vibrating screen body, the blowing direction of the blowing device is toward the feed port, and the wind pressure blown into the vibrating screen body by the blowing device is lower than the feed air pressure of the feed port.

2. The vibrating screen for milk powder production according to claim 1, characterized in that: A screen is provided in the vibration screen body, a working surface of the screen is perpendicular to the feeding direction of the feed port, and the blowing device is higher than the screen.

3. The vibrating screen for milk powder production according to claim 2, characterized in that: A fine powder discharge pipe is provided at one end of the vibrating screen body away from the feed port, and the fine powder discharge pipe is used to discharge the fine powder screened by the screen from the vibrating screen body.

4. The vibrating screen for milk powder production according to claim 2, characterized in that: A slag discharge pipe is provided at one end of the vibrating screen body away from the feed port. The blowing device is located above the slag discharge pipe, and the blowing direction of the blowing device is away from the slag discharge pipe. The slag discharge pipe is used to discharge the coarse particles intercepted by the screen from the vibrating screen body.

5. The vibrating screen for milk powder production according to claim 4, characterized in that: The slag discharge pipe is provided with an exhaust pipe, and the inlet of the exhaust pipe is provided with a filter screen.

6. The vibrating screen for milk powder production according to claim 1, characterized in that: The blowing device is a horizontally arranged blowing pipe, and a plurality of first blowing ports are opened on the blowing pipe along the length direction, and the first blowing ports face the feed port.

7. The vibrating screen for milk powder production according to claim 1, characterized in that: One end of the blowing device facing the feed inlet is a flared end, and a plurality of second blowing ports are arranged in an array on the end surface of the flared end, and the second blowing ports face the feed inlet.

8. The vibrating screen for milk powder production according to claim 1, characterized in that: The air purification component comprises a water and oil removal device, a primary filter device and a fine filter device which are sequentially arranged along the air intake direction.

9. The vibrating screen for milk powder production according to claim 1, characterized in that: The air inlet pipe is provided with a regulating valve, which is located between the air purification component and the blowing device and outside the vibrating screen body.

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