TWI758442B - Compact dedusting apparatus with remote discharge - Google Patents

Abstract

A compact dedusting apparatus induces air flow through the housing by a vacuum generator mounted within the housing. The discharge of dust and debris can be passed through a conduit to a remote location without losing air flow velocity to facilitate the use of the compact dedusting apparatus within a clean room. The metering device is formed from stainless steel and mounted on a spring-loaded mounting plate to permit vertical movement of the metering device when a jam of the particulate material is encountered. The metering device can be driven by a low torque stepper motor operable at selectively variable speeds to control the flow rate of the particulate material. The discharge transition is formed with an enlarged cross-sectional area compared to the shape of the Venturi zone so that carryover pellets can be returned to the product flow instead of being lost with the dirty air discharge.

Description

Small dust collector with remote discharge

The invention disclosed in this application relates generally to the cleaning and handling of granular materials, such as plastic pellets, secondary pulverized materials, nuggets, grains, minerals and the like, and particularly to a small-sized dust removal device for An airflow is generated through it to remove dust and debris entrained by the granular material and provides the ability to discharge the collected dust and debris to a remote location to maintain clean room conditions.

It is well known, especially in the field of conveying and using granular materials (generally coarse powders, granules, plastic pellets and the like), that it is important to keep the product particles as free of contaminants as possible, which are generally in a In-device delivery, the particles are mixed, packaged or used within a pressurized tubular system that actually produces a stream that behaves somewhat like a liquid. As these materials move through the pipe, considerable frictional forces are created not only between the particles themselves, but also between the particles in the material flow and the pipe wall. This friction creates dust, crumbs, fluff, and streamers (ribbon-like elements that can "grow" into rather long clumps that obstruct material flow, or even block flow entirely). The characteristics of such delivery systems are quite well known, as is the importance and value of keeping product particles as free of contaminants as possible.

The term "contaminants" as used herein includes a wide range of foreign objects, as well as the debris, dust, fluff and streamers described in the preceding paragraph. In any case, contaminants are not conducive to high-quality products, there are In some cases there is a health risk to the manufacturer's employees, and there may even be a source of danger where certain contaminants produce dust clouds that could explode if exposed to an ignition source.

Considering product quality, and focusing on moldable products as the main example, the composition of foreign matter is different from the primary material, such as dust, non-uniform material of the primary product, fluff and streamers, not necessarily the same as the primary product melting point product, when Defects in the melting and molding of materials that cause the final product to be uneven in color, may contain bubbles, often appear dirty or stained, and cannot be sold. The heat inside the injection molding machine vaporizes the dust, resulting in small air bubbles in the final product. Heat also burns dust and creates "black spots," which are actually carbonized dust. Sometimes dust bags in machines don't melt and cause "soft spots" or "white spots" (common names for these defects). It's important to note that since these same heterogeneous materials tend not to melt at the same temperature as the primary product, unmelted contaminants cause friction and premature wear on the molding machine, resulting in downtime, lost production, reduced productivity, and increased maintenance , thus increasing the total production cost.

Conventional granular material dedusting devices, such as US Pat. No. 5,035,331 issued to Jeremy I. Pawson on July 30, 1991, use first and second punches that form a pour surface and have openings in the device For the passage of pressurized air, the granular material flows along the punching plate. Between the two punching plates, the granular material passes through a Venturi zone, which combines the air flowing over the granular material on the punching plates, pulling dust and other contaminants upward along with the airflow out of the device.

In US Patent No. 7,380,670, issued June 3, 2008 to Jeremy I. Pawson, Heinz Schneider, and Paul Wagner, a small dust extraction device has a back-to-back punch assembly utilizing a punch and a venturi The inner area is doubled to provide increased capacity, which requires the incoming flow of granular material to be equally distributed to the second punch plate assembly. In US Pat. No. 5,035,331 and US Pat. No. 7,380,670, a magnetic flux field is applied to a feed of granular material to neutralize static forces that attract contaminants to particulate pellets Electric charge to strengthen the operation of the punching plate to separate the pollutants from the granular materials.

A Korean company, Uniceltec, develops and markets a small dust removal device, as disclosed in PCT Application No. PCT/KR2013/002924 filed on April 8, 2013 by Joong Soon Kim et al. Appropriately modified to meet the needs of the US market, it has been marketed in the United States by Pelletron Corporation as the C-20 model. The applicant has made significant improvements to the C-20 type dust removal device and wants to apply for this patent. The case protects these improvements.

Among the problems identified in the currently marketed C-20 dust collector developed by Uniceltec is to provide a urethane metering device that wears through binding to the granular material and increases the flow into the granular material to be cleaned The corresponding amount of dust. The C-20 type dust removal device can be used in a clean room, which is a chamber into which surrounding dust cannot enter due to specific operations performed inside. A previous model of this small dust collector developed by Uniceltec in Korea used a pressurized air powered vacuum generator to provide cleaning of granular materials that needed to be discharged from the dust collector, even through a dust collection device. This arrangement does not allow distal discharge of collected dust and debris and airflow. Finally, the problem with the dedusting device developed by Uniceltec is that the granular material is entrained by the dust and debris discharged, resulting in the loss of the granular material.

Therefore, there is a need to provide a compact dust removal device which should solve the problems of the previously developed Uniceltec dust removal devices, especially for use in clean rooms.

It is an object of the present invention to provide a small dust removal device for use in a clean room to clean granular material, such as plastic pellets, to remove dust and debris from the granular material.

Another object of the present invention is to provide a solution to the previously developed small dust collectors Small dust removal device with known problems with the installation.

A feature of the present invention is the use of vacuum to generate airflow through a small dust collector.

Another feature of the present invention is that the vacuum generating device that utilizes the vacuum to generate an air flow through the compact dust collector is located within the compact dust collector frame and is large enough to allow the distal end of the dust collection device to be positioned.

An advantage of the present invention is that the vacuum generating device is positioned within the frame cover of the small dust removal device, so that the dust collection device can be located remotely relative to the dust removal device without reducing the air flow through the dust removal device.

Another feature of the present invention is that the shape of the discharge transition chamber between the venturi chamber and the dirty air discharge port in the dust collector has been enlarged to provide a larger cross-sectional area.

Another advantage of the present invention is that the increased cross-sectional area of the discharge transition chamber operates to reduce airflow velocity within the discharge transition chamber.

Yet another advantage of the present invention is that the slowing of the airflow in the enlarged discharge transition chamber allows heavier plastic pellets entrained by dust and debris towards the dirty air discharge to fall out of the airflow towards the clean product material discharge while collecting The dust and debris continue toward the dirty air exhaust.

Yet another feature of the present invention is that the metering device is made of stainless steel rather than urethane.

A further advantage of the present invention is that the stainless steel metering device does not wear out due to binding to the plastic pellets and does not add dust to the flow of granular material to be cleaned.

Yet another feature of the present invention is that the metering device is mounted on a spring-loaded mounting plate to allow vertical movement of the metering device upon encountering a jam of the plastic pellet.

Yet another advantage of the present invention is that the vertical movement of the metering device is coupled with the mounting plate It stops when the stopper mechanism is integrated to prevent the metering device from hitting the floor of the feeding port and combining and interrupting the granular flow flowing along the floor.

Yet another advantage of the present invention is that the metering device can be operated by a low torque motor to reduce the manufacturing cost of the dedusting device.

A further advantage of the present invention is that the low torque motor can operate the metering device at different rotational speeds to vary the rate at which the granular material flows through the dedusting device.

Yet another feature of the present invention is that the ionization tip can be installed in the small dust removal mechanism in the granular material flow flowing through the metering device to reduce negative ions on the plastic pellets to remove fine dust particles from the plastic pellets to assist Cleaning in the Venturi interior.

Yet another advantage of the present invention is that pressurized air surrounds the ionization tip to propel the ions into the flow of granular material flowing through the ionization tip.

Yet another advantage of the present invention is the use of pressurized air to move ions into the granular material stream to cause more individual particles with negative ions to adhere to dislodge dust particles and assist in the cleaning of the granular material.

Yet another feature of the present invention is that the collected dust and debris removed from the granular material is discharged from the small dust collector via a conduit under negative pressure.

Yet another advantage of the present invention is that the use of a vent tube under negative pressure allows leaks to occur in the vent tube without spitting the contents of the vent tube to the outside world.

A further advantage of the present invention is that the use of a discharge pipe under negative pressure enables the dust collector to be used in a clean room.

Yet another object of the present invention is to provide a small dust removal device capable of remotely discharging collected dust and debris, durable in construction, inexpensive to manufacture, smooth maintenance, easy to assemble, and easy to use Simple and efficient to use.

These and other objects, features and advantages are achieved in accordance with the present invention by providing a dust removal device in which an air flow is generated using a vacuum generator mounted in the frame to flow through the frame, dust and debris being removed. The discharge can be routed to a remote location using a tube without loss of air velocity to aid in the use of a dust collector in a clean room. The metering device is constructed of stainless steel and is mounted on a spring-loaded mounting plate to allow vertical movement of the metering device when clogged with granular material. The metering device can be driven by a low torque stepper motor that operates at select variable speeds to control the granular material flow rate. The discharge transition chamber creates an enlarged cross-sectional area compared to the shape of the Venturi zone so that entrained particles can be returned to the product stream rather than being lost along with dirty air discharge.

10: Dust removal device

12: Frame cover

13: Assemble the flange

14: Feed hole

14a: Flooring

15: Metering device

16: Feed port

17: Motor

19: Conical grooved member

20: Dust removal area

21: The first chamber

22: Vertical part

23: Sloping Floors

24: Oblique

25: Ionized tip

26: Venturi Room

26a: Emission transition chamber

27: Clean Air Inlet

28: Product discharge port

29: Mounting flange

30: Vacuum generator

31: Electrical cover

33: Discharge pipe

34: Filter auxiliary port

35: Dust collector

36: Container

37: Air vents

38: Inlet pipe

39: Fixtures

40: Plexiglass window

41: Frame

43: Fasteners

45: Compressed air connector

46: Pressure regulator

47: Tee joint port

50: Mounting plate

51: Vertical slotted hole

52: Fixing parts

53: Baffle

55: Blocker

57: Hand screw

59: Power cord

The advantages of the present invention will become clear when considering the following detailed disclosure of the present invention, especially in conjunction with the accompanying drawings, wherein: Figure 1 is a perspective view of a small dust removal device using the principles of the present invention; Figure 2 is a small dust removal device shown in Figure 1 Side view; Fig. 3 is the front view of the small dust removal device at the far end of the dust collection device; Fig. 4 is the top plan view of the small dust removal device; Fig. 5 is the sectional view taken along the A-A line in Fig. 2 of the small dust removal device; Figure 7 is an enlarged front view of the mounting plate corresponding to the circle in Figure 2, on which the metering device is supported for vertical movement.

Referring to Figures 1-7, a miniature dust collector employing the principles of the present invention can best be seen using the one disclosed in US Pat. No. 5,035,331 issued to Jeremy I. Pawson on June 3, 1991 The general dedusting technique of the dust collector includes air passing through a venturi zone through which the granular material passes, and the air removes dust and debris from the granular material, and the granular material is electromagnetically ionized to generate negative ions on the granular material , to separate small particles from fine dust particles. However, these contaminant removal techniques differ in the manner of structure and are generally described in PCT Application No. PCT/KR2013/002924, filed on April 8, 2013 by Joong Soon Kim et al. King's dust collector was modified, as described in detail hereinafter.

The dust removal device 10 is generally rectangular in shape and configuration. The outer frame cover 12 is preferably made of a durable material, such as steel or cast iron, and can be formed by casting techniques. The top of the frame cover 12 is formed with an assembly flange 13 that can be snapped. A supply of granular material is received for introduction into the feed hole 14 at the top of the frame cover 12 . The feed hole 14 forms a downwardly sloping curved floor 14a which directs the flow of granular material to a metering device 15 located above the feed opening 16 in the floor 14a, which is a low torque motor driven by a step. Conical fluted member 19 is driven by 17 and motor 17 can be operated at a selected variable speed to control the flow rate of granular material through feed port 16. The conical grooved member 19 is preferably formed of stainless steel so that its combination with the granular material will not wear the member 19 and create additional dust that passes with the granular material from which the dust is to be removed, as in The conical grooved member 19 is conventionally formed of urethane.

The metered granular material enters a first chamber 21 of the dust removal area 20 through the feeding port 16. When the granular material passes downward through a vertical portion 22 of the first chamber 21, a series of ionization tips 25 will remove negative ions. Guided onto individual pellets, the granular material then contacts a downwardly inclined floor 23, which establishes an inclined portion 24 of the first chamber 21 to guide the ionized granular material. into the vertical Venturi chamber 26 (direction parallel to the vertical portion 22, but offset from the inclined portion 24 across the vertical portion 22). Clean air is fed upwards into the Venturi chamber 26 (more on this later) so that the air lifts dust particles and debris, which are significantly lighter than individual granules of granular material, thereby removing dust and debris. Chip removal and cleaning of granular materials. The dust and debris-laden air is then discharged from the dust collection zone 20, as will be described in detail later. The cleaned granular material then passes downward through the product discharge port 28 at the bottom of the frame cover 12 due to gravity.

The air flow through the venturi chamber 26 is preferably produced by a vacuum generator 30 in the form of a vacuum line mounted in an electrical enclosure 31 supported by the frame cover 12 to establish a distance from the dedusting zone 20 to the deviated dedusting A channel of the dust collector 35 of the device 10 . Those skilled in the art should know that the position of the vacuum generator 30 can also be placed inside the frame cover 12 , depending on the structure of the frame cover 12 . The discharge pipe 33 communicates with the venturi chamber 26 at a discharge transition chamber 26a which forms the upper part of the venturi chamber 26 to draw dust and debris laden air into the discharge pipe 33°. This vacuum draws the air from the venturi. The product discharge port 28 at the bottom of the frame cover 12 draws into the venturi chamber 26 .

The vacuum generator 30 receives compressed air for its own operation from a compressed air supply connected to a compressed air connector 45, which is located on the backside of the bezel 12, as best shown in Figures 3-5. The compressed air flows through a pressure regulator 46 and is fed into a tee joint port 47 in the frame cover 12. The tee joint port 47 divides the compressed air flow into two paths (not shown), one of which sends the compressed air. to the ionization tip 25 and compressed air flows around the ionization tip 25 to force ions into the flow of granular material flowing through the vertical portion 22 of the first chamber 21 . The second flow path carries the flow of compressed air to the vacuum generator 30, which converts the relatively high pressure low volume gas flow into a relatively low pressure high volume gas flow through the vacuum generator 30 to draw the air through the discharge line 33 using the generated vacuum .

In certain circumstances associated with the use of the compact dust collector 10, the mounting flange 29 at the bottom of the frame cover 12 may be connected to a receiving device (not shown) for receiving the clean product, the receiving device may seal the mounting flange 29, which may The vacuum generator 30 is prevented from drawing air through the product exhaust port 28 . In the case of using the compact dust collector 10 in a clean room with a receiver seal mounting flange 29, in this case a filter auxiliary port 34 is opened to allow air to pass through a clean air inlet located near the product discharge port 28 27 is drawn in so that air will enter the venturi chamber 26 via the product discharge port 28 .

The speed at which the cleaning air travels up through the venturi chamber 26 is selected, which may vary depending on the granular material to be cleaned, to carry dust and debris upward while allowing small particles to fall. However, sometimes small particles are entrained in the upward airflow, commonly referred to as "carryover". Once the entrained airflow reaches the discharge pipe 33, which has a smaller cross-sectional area than the venturi chamber 26, the airflow velocity increases, further entraining small particles. In order for the entrained pellets to fall down towards the product discharge port 28, the discharge transition chamber 26a of the venturi chamber 26 is widened, as best shown in FIG. This results in a reduction in airflow velocity and provides an opportunity for the entrained pellets to fall without being entrained and towards the product discharge port 28 before being drawn into the discharge pipe 33 .

As best shown in Figure 6, the discharge pipe 33 extends beyond the vacuum generator 30 towards the dust collector 35, among others, even though the dust collector 35 may be formed in various configurations including filters, washers and cyclones machine, a small dust collector 35 that rotates the air carrying dust and debris to separate the dust and debris is effective, and the separated dust and debris are collected in a removable container 36 located at the bottom of the dust collector 35, while the Clean air is exhausted through the ventilation holes 37 at the top of the dust collector 35 . In certain cases, such as clean rooms, the discharge of clean air to the outside is not allowed, In this case, the dust collector 35 may be provided at a distal position allowing the discharge of clean air, and the discharge pipe 33 extends to this distal position.

When the vacuum generator 30 is located at the dust collector 35, as is known in the King's dust collector as described in PCT Application No. PCT/KR2013/002924, the air velocity flowing through the venturi chamber 26 is placed at the distal location Therefore, placing the vacuum generator 30 in the appliance housing 31 allows the dust collector 35 to be located remotely without adversely changing the air velocity through the dust collector 10 . For this purpose, the discharge pipe 33 ends at a suitable distance outside the appliance housing 31 so that the inlet pipe 38 of the dust collector 35 can be connected to the discharge pipe 33 and fixed by a clamp 39 . In the case where the dust collector 35 is disposed at the distal end, the clamp 39 is removed to allow the dust collector 35 to be properly positioned, while a length of extension pipe (not shown) is connected between the discharge pipe 33 and the inlet pipe 38 to carry the dust and debris air is carried to the dust collector 35 provided at the distal end.

Another improvement to the King's small dust removal device described in PCT application No. PCT/KR2013/002924 is to provide a plexiglass window 40 on the side of the frame cover corresponding to the position of the venturi chamber 26, and the shape of the plexiglass window 40 corresponds to the position of the venturi chamber 26. The inclined portion 24 of the first chamber and the lower vertical portion of the venturi chamber 26 allow the user to observe the operation of the dust removal device 10, and to determine the flow rate of the granular material fed into the first chamber 21 or the flow rate of the material flowing into the venturi chamber 26. Air velocity is adjusted to provide effective cleaning of granular materials. The plexiglass window 40 is installed in the frame 41 and fixed and sealed to the frame cover 12 by the fixing member 43 . Those skilled in the art should understand that a sensor (not shown) can be installed on the window to detect the granular materials collected in the dust removal area 20, and the timing is when the cleaned granular materials passing through the product discharge port 28 are consumed. When the program stops working.

As best shown in Figures 2, 3 and 7, the metering device 15 is mounted for rotation with the output shaft 18 of the low torque motor 17 which is mounted on a movable mount outside the frame housing 12 On the plate 50, the mounting plate 50 is formed with a vertical slot 51 for the fixing member 52 to pass through and combine with the frame cover 12. The fixing member 52 allows the mounting plate 50 to move relative to the frame cover 12, but does not allow the mounting plate 50 to escape from the frame cover. 12 sides. A stopper 55 is fixed on the frame cover 12 below the mounting plate 50 , and a stopper includes a torsion spring 56 connecting the stopper 55 and the mounting plate 50 , biasing the mounting plate 50 downward toward the stopper 55 .

The stopper includes a thumbscrew 57 protruding upwardly therefrom received by the stopper frame 55 to engage a stopper piece 53 on the mounting plate 50 . When the blocking piece 53 touches the upper end of the hand screw 57 , it reaches the lowest position of the mounting plate 50 . Another purpose of the hand screw 57 is to provide adjustment of the lowermost position of the mounting plate 50, which corresponds to the lowermost position of the conical grooved member 19 relative to the inclined floor 14a. Since the conical grooved member 19 is made of stainless steel, the combination of the conical grooved member 19 with the floor 14a should be avoided. However, the conical grooved member 19 may be in its lowest position slightly above the floor 14a so that when the dust removal device 10 is not in operation, granular material cannot pass under the conical grooved member 19 and into the dust removal area 20. Thus, the top assembly flange 13 can be connected to a supply of material from the metering device 15 injected into the feed hole to the top assembly flange 13, while the metering device 15 stops the passage of granular material through the dedusting zone when the dedusting device is not in operation.

When granular material is clogged in the feed hole 14, upward movement of the mounting plate relative to the frame cover 12 allows the conical grooved member 19 to rise vertically to unblock and free the conical grooved member that may otherwise be stuck 19 and were crushed or damaged by the stainless steel cone-shaped grooved member 19. Additionally, having the metering device 15 move up and down allows the motor 17 to be a stepper low torque motor powered via a power cord 59 connected to the dust removal device 10 electrical circuit. If the stainless steel conical grooved member 19 is placed in the existing configuration of the Uniceltec unit, the result is that the chopped particles cause irregularities in the cleaned product, more dust to be removed from the product, motor failure, shafts due to this failure Broken rod and clogged dust collector operation.

In operation, the small dust collector 10 is positioned to receive a supply of granular material into the feed hole 14 at the top of the frame housing 12, and this positioning may require the upper assembly flange 13 to be connected to the means for feeding the granular material. The metering device 15 is powered to rotate the conical grooved member 19 to control the flow of granular material through the feed port 16 into the dedusting zone 20. The granular particles are ionized by the ionization tip 25 located in the vertical part 22 of the first chamber 21, and then the ionized particles fall on the inclined floor 23, and the particles are introduced into the venturi chamber 26, and there is an upward flow of air in the venturi chamber 26. Through the product discharge port 28 , dust and debris are removed from the pellets so that the clean pellets can continue to fall by gravity and through the product discharge port 28 .

The dust and debris-laden air continues to flow upward to a discharge pipe 33 located at the top of a discharge transition chamber 26a of the venturi chamber 26, between the lower vertical portion of the venturi chamber 26 and the discharge pipe 33, the venturi chamber 26 The discharge transition chamber 26a expands in size and cross-sectional area so that the airflow velocity is reduced to allow the entrained particles to fall out of the entrainment of the air before moving into the discharge tube 33. Air carrying dust and debris continues to flow through the vacuum generator 30 to a dust collector 35, which may be located at a distal location and connected to the discharge pipe 33 by a supplemental pipe (not shown). Since the vacuum generator 30 is located within the appliance housing 31 , the dust collector 35 can be positioned away from the dust collector 10 without detracting from the airflow through the venturi chamber 26 .

The conical grooved member 19 is formed of stainless steel to prevent abrasion from binding to the granular material, as is known for conventional urethane members. The metering device 15 is mounted for vertical movement by means of a mounting plate 50 which is biased towards the lowermost position by a torsion spring 56 . An adjustment mechanism in the form of a stop 55 (with an adjustable hand screw 57 therein) allows selective adjustment of the lowermost position of the metering device 15 so that the stainless steel tapered grooved member 19 will be properly inclined relative to the curvature of the feed hole 14. Plate 14a is positioned.

The configuration of the upper assembly flange 13 is such that it does not lie above the feed hole 14 to provide Constructed to collect particulate material and reduce the operating efficiency of the dust removal device 10 . An opening in the frame cover 12 is covered by a plexiglass window 40. The plexiglass window 40 is set in the frame body 41 and fixed to the frame cover 12 by a fixing member 43, so that the operator can observe the operation of the dust removal area 20 and perform it when necessary. Operation adjustment. The lower mounting flange 29 seals against a receptacle (not shown), a clean air inlet 27 through which the cleaning air flow can pass, extending from the side of the frame cover 12 to the lower mounting flange near the product. An orifice in the vent 28 so that air can be drawn through the clean air inlet 27 and then flow up through the product vent 28 to inject into the venturi chamber 26 and remove dust and debris from the granular material.

Please understand that the details, materials, steps and arrangements of elements which have been described and illustrated to explain the nature of the invention can vary and can be made by those skilled in the art upon reading this text in the spirit of the scope of the invention. The foregoing description illustrates the preferred embodiment of the present invention; however, the concepts based on the description may be applied to other embodiments without departing from the scope of the present invention. Accordingly, the following claims are intended to broadly protect the invention and the specific forms shown.

10: Dust removal device

13: Assemble the flange

14: Feed hole

14a: Flooring

15: Metering device

19: Conical grooved member

23: Sloping Floors

26: Venturi Room

26a: Emission transition chamber

28: Product discharge port

29: Mounting flange

30: Vacuum generator

31: Electrical cover

33: Discharge pipe

35: Dust collector

36: Container

37: Air vents

38: Inlet pipe

39: Fixtures

40: Plexiglass window

Claims (21)

A dust removal device for removing pollutants from granular materials, comprising: a frame cover forming a dust removal area to remove pollutants from granular materials, and a product discharge port; a motor mounted on a mounting plate , the mounting plate is configured to be movable vertically relative to the frame cover, the mounting plate can be combined with an adjustable stopper that defines the lowest position of the mounting plate; a feed hole, which is located at an upper position of the frame cover to receive pellets a supply of granular material, the feed hole including a sloped floor to direct the granular material down towards a feed opening; a metering device located within the feed hole and operable to control the amount of flow through the feed opening The flow rate of granular material, the metering device includes a conical grooved member made of stainless steel and mounted on an output shaft of the motor so that the conical grooved member can be adjusted vertically with the motor so that its lowest position is at above the sloping floor of the feed hole; a venturi chamber positioned to receive granular material through the feed port and to utilize an air flow from the product discharge port up into the venturi chamber to remove contaminants from the granular material cleaning of granular material, while the cleaned granular material falls through the product discharge port; and a discharge pipe positioned above the venturi chamber to receive dust and debris-laden air moving upwardly from the venturi chamber, the discharge pipe Move the dust and debris laden air away from the dust collection area. The dust removal device of claim 1, wherein the stopper is a hand screw installed in a stopper, the stopper is fixed on the frame cover below the mounting plate, and a plurality of torsion springs are connected to the mounting plate With the blocking frame, the mounting plate is positioned in a biased direction to be combined with the hand-turned screw. The dust removal device of claim 1, wherein the air flow through the venturi chamber is generated by a vacuum generator installed at a fixed position relative to the dust removal device Positioned, the vacuum generator communicates with the exhaust pipe to draw air from the product exhaust port into the exhaust pipe through the venturi chamber. According to the dust removal device of item 3 of the scope of application, further comprising a discharge transition chamber communicating with the venturi chamber and between the venturi chamber and the discharge pipe, the cross-sectional area of the discharge transition chamber is larger than that under the discharge transition chamber The venturi chamber and the discharge duct above the discharge transition chamber cause the airflow to decrease in velocity before entering the discharge duct. The dust removal device of claim 4, wherein the frame cover forms a clean air inlet which can be selectively opened to provide an air flow through the frame cover and out of an opening located near the product discharge port, so that when the When the product outlet is sealed to prevent air from being drawn from outside the hood through the product outlet, the clean air inlet can be opened to provide a source of clean air from outside the hood. The dust removal device as claimed in claim 1, wherein the dust removal area further comprises a first chamber, the first chamber comprises a vertical part and an inclined part, the vertical part is communicated with the feed port to receive the feed from the feed port. The granular material from the feed port, the

The ramp includes a sloping floor that incorporates the granular material falling through the vertical and guides the granular material laterally into the venturi chamber. The dust removal device as claimed in claim 6, wherein the vertical portion of the first chamber includes an ionization tip mounted on the side wall thereof to guide ions to the granular material and separate dust particles from small particles, Assists in the removal of the dust particles from the pellets in the venturi chamber. A dust removal device for removing pollutants from granular materials, comprising: a frame cover, forming a dust removal area to remove pollutants from granular materials, and a product discharge port, the dust removal area further includes a first container The first chamber includes a vertical portion and an inclined portion, the vertical portion communicates with the feed port to receive granular materials from the feed port, the vertical portion of the first chamber The straight part includes an ionization tip mounted on its side wall to guide ions to the granular material and separate dust particles from the small particles; a feed hole located at an upper position of the frame cover to receive the granular material a supply of material, the feed hole including a sloped floor to direct granular material down towards a feed opening; a metering device located within the feed hole and operable to control the flow of pellets through the feed opening flow of material; a venturi chamber positioned to receive granular material through the feed port and to utilize a flow of air from the product discharge port up into the venturi chamber to remove contaminants from the granular material while cleaning After the granular material falls through the product discharge port, the slope includes a sloping floor that binds the granular material falling through the vertical drop and guides the granular material laterally into the venturi chamber, assisting in the venturi chamber. Dust particles are removed from the pellets; an exhaust pipe positioned above the venturi chamber to receive dust and debris laden air moving upwards from the venturi chamber, the exhaust pipe moving the dust and debris laden air away the dust removal area; and a discharge transition chamber between the venturi chamber and the discharge pipe and in communication with the venturi chamber and the discharge pipe, the cross-sectional area of the discharge transition chamber is larger than the venturi chamber or the discharge tube so that the air flow is reduced in velocity before entering the discharge tube from the venturi chamber. The dust removal device of claim 8, wherein the airflow through the venturi chamber is generated by a vacuum generator, the vacuum generator is installed at a fixed position relative to the dust removal device, and the vacuum generator is connected to the dust removal device. The exhaust pipe communicates to draw air from the product exhaust port to flow through the venturi chamber and the exhaust transition chamber into the exhaust pipe. The dust removal device of claim 9, wherein the frame cover forms a clean air inlet, It is selectively openable to provide an air flow through the hood and out of an opening located near the product outlet so that when the product outlet is sealed, air is prevented from being drawn from outside the hood through the product outlet, The clean air inlet can be opened to provide a source of clean air from outside the frame. The dust removal device as claimed in claim 8, wherein the metering device comprises a conical grooved member made of stainless steel and vertically adjustable so that its lowest position can be located above the inclined floor of the feed hole. The dust removal device of claim 11, wherein the conical grooved member is mounted on an output shaft of a motor, the motor is mounted on a mounting plate, and the mounting plate is configured to be vertically movable relative to the frame cover , the mounting plate can be combined with an adjustable stopper, the adjustable stopper defines a lowermost position of the mounting plate, and thus defines the corresponding lowermost position of the conical grooved member. The dust removal device of claim 12, wherein the stopper is a hand screw installed in a stopper frame, the stopper frame is fixed at the position where the frame cover is located below the installation plate, and a plurality of torsion springs are connected to the installation plate With the blocking frame, the mounting plate is positioned in a biased direction to be combined with the hand-turned screw. A dust removal device for removing pollutants from granular materials, comprising: a frame cover forming a dust removal area to remove pollutants from granular materials; a feeding hole located at an upper position of the frame cover to receiving a supply of granular material, the feed hole includes a sloped floor to direct the granular material downward toward a feed opening; a metering device located within the feed hole and operable to control flow through the feed The flow of granular material from the mouth, the metering device consists of a stainless steel and vertically adjustable conical grooved member so that its lowest position can be located above the inclined floor of the feed hole, the cone-shaped grooved member is mounted on. On an output shaft of a motor, the motor is mounted on a mounting plate and combined, the mounting plate Configured to be movable vertically relative to the frame cover, the mounting plate can be combined with an adjustable stopper, the adjustable stopper defines a lowermost position of the mounting plate, and the lowermost position of the mounting plate defines the tapered The corresponding lowest position of the groove member; a venturi chamber positioned to receive granular material through the feed port and to utilize a flow of air from a product discharge port up into the venturi chamber to remove contaminants from the granular material The material is removed, while the cleaned granular material falls through the product discharge port; a discharge pipe positioned above the venturi chamber to receive dust and debris-laden air moving upward from the venturi chamber, the discharge pipe Dust and debris-laden air moves away from the dedusting zone; a vacuum generator, mounted in a fixed position relative to the dedusting device, communicates with the exhaust pipe to draw air from the product exhaust port inflow through the venturi chamber into the discharge pipe; a dust collector in communication with the discharge pipe outside the vacuum generator, the dust collector can be positioned at a the desired location without detracting from the airflow velocity through the venturi chamber; and a discharge transition chamber in communication with the venturi chamber and the discharge pipe, and between the venturi chamber and the discharge pipe, the discharge The cross-sectional area of the transition chamber is larger than the venturi chamber below the discharge transition chamber and the discharge duct above the discharge transition chamber, so that the velocity of the airflow is reduced before entering the discharge duct. The dust removal device of claim 14, wherein the frame cover forms a clean air inlet that can be selectively opened to provide an air flow through the frame cover and out of an opening located near the product discharge port, so that when the When the product discharge port is sealed, prevent Air is drawn from outside the hood, and the clean air inlet can be opened to provide a source of clean air from outside the hood. The dust removal device of item 14 of the scope of application, wherein the stopper is a hand screw installed in a stopper, the stopper is fixed at the position where the frame cover is located below the mounting plate, and a plurality of torsion springs are connected to the mounting plate With the blocking frame, the mounting plate is positioned in a biased direction to be combined with the hand-turned screw. A dust removal device for removing pollutants from granular materials, comprising: a frame cover forming a dust removal area to remove pollutants from granular materials, and a product discharge port; a feeding hole located in the frame an upper portion of the hood to receive a supply of granular material, the feed hole including a sloping floor to direct the granular material down toward a feed port; a venturi chamber positioned to receive passage through the feed port The granular material is used to remove contaminants from the granular material by using an air flow from the product discharge port to enter the venturi chamber, and the cleaned granular material falls through the product discharge port; at least one ionization tip, which is installed On the side of the frame cover below the feed port to introduce negative ions to the granular material passing through the feed port to help separate dust particles from small particles to assist the dust particles in the venturi chamber removed from the pellets; and an exhaust pipe positioned above the venturi chamber to receive dust and debris laden air moving upwardly from the venturi chamber, the exhaust pipe moving the dust and debris laden air away from the venturi chamber Dust removal area. The dedusting device of claim 17 of the claimed scope further includes a metering device located in the feed hole and operable to control the flow rate of granular material flowing through the feed opening, the metering device comprising a stainless steel and capable of The vertically moving conical grooved member allows its lowest position to be located above the sloped floor of the feed hole. The dust removal device of claim 18, wherein the conical grooved member is mounted on an output shaft of the motor, the motor is mounted on a mounting plate, and the mounting plate is configured to move vertically relative to the frame cover , the mounting plate can be combined with an adjustable stopper, the adjustable stopper defines a lowermost position of the mounting plate and thus defines the corresponding lowermost position of the conical grooved member. The dust removal device of claim 17, wherein the air flow through the venturi chamber is generated by a vacuum generator installed at a fixed position relative to the dust removal device, the vacuum generator being connected to the dust removal device. The exhaust pipe communicates to draw air from the product exhaust port to flow through the venturi chamber and the exhaust transition chamber into the exhaust pipe. The dust removal device of claim 20, wherein the frame cover forms a clean air inlet that can be selectively opened to provide an air flow through the frame cover and out of an opening located near the product discharge port, so that when the When the product outlet is sealed to prevent air from being drawn from outside the hood through the product outlet, the clean air inlet can be opened to provide a source of clean air from outside the hood.

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