Paraformaldehyde pulverizer

Abstract

The utility model relates to the technical field of solid paraformaldehyde crushing, in particular to a paraformaldehyde crusher, which comprises a separation tank, and a feed port, an air outlet, a fine material outlet and a coarse material outlet which are communicated with the separation tank, a feeding separation barrel and a discharging separation barrel are arranged in the separation tank, a plurality of tower-shaped crushing cones are arranged on the inner wall of the feeding separation barrel, and a sieve plate is arranged at the upper end of the discharging separation barrel; the fine material outlet is communicated with the space of the inner ring of the discharging separation barrel, and the coarse material outlet is communicated with the space between the outer ring of the discharging separation barrel and the conical tank body; the lower ends of the fine material outlet and the coarse material outlet are respectively communicated with a fine material feeder and a coarse material feeder, the coarse material feeder is communicated with a stirring grinding box, the lower ends of the fine material feeder and the stirring grinding box are communicated with a conveying auger, and the tail end of the conveying auger is provided with a grinder. According to the paraformaldehyde crusher disclosed by the utility model, the uniformity of fed raw materials is ensured, and the feeding port is prevented from being blocked; the crushing load is prevented from being increased; and materials with homogenized granularity can be stably crushed and produced.

Description

Technical Field

[0001] This utility model relates to the field of solid paraformaldehyde pulverization technology, specifically a paraformaldehyde pulverizer. Background Technology

[0002] Paraformaldehyde is a linear polymer of formaldehyde, usually produced as a white powder or granules as the final product, and is widely used in resin synthesis, disinfection, and agriculture.

[0003] The production process of paraformaldehyde is as follows: A formaldehyde solution containing a small amount of methanol is partially diluted by vacuum distillation or evaporation to increase the concentration of the formaldehyde solution; the reaction is carried out under process temperature conditions with stirring to cause formaldehyde condensation and the formation of a linear polymer, during which the degree of polymerization is adjusted by controlling the reaction time and temperature; the solid particles of paraformaldehyde are separated from the mother liquor by centrifugation or filtration; residual formaldehyde is removed by washing with pure water or organic solvents; and clean, dry granular paraformaldehyde is obtained by passing the product through a fluidized bed dryer or vacuum dryer; the granular paraformaldehyde is then crushed and packaged as needed for transportation and storage.

[0004] Currently, controlling the particle size of paraformaldehyde (PFO) is a crucial step in industrial production. Pulverizing PFO can improve reaction efficiency, optimize solubility, enhance processing adaptability, regulate the performance of end products, better meet current safety and environmental considerations, and effectively improve economic benefits. Therefore, pulverizing PFO particles is a critical step in large-scale PFO production. However, conventional pulverization methods still present the following technical problems:

[0005] Due to the properties of paraformaldehyde, its particles may exhibit physical melting and agglomeration, or chemical bridging and bonding. Directly feeding agglomerated or clumped raw materials into the crushing equipment will block the feed inlet, increase the load on the crushing equipment during crushing, reduce the crushing output, and even affect the crushing effect, resulting in uneven particle size. Utility Model Content

[0006] To address the technical problems existing in the background art, this utility model provides a paraformaldehyde pulverizer that ensures the uniformity of the input raw materials, prevents clogging of the feed inlet, avoids increasing the pulverizing load, and smoothly pulverizes materials with uniform particle size.

[0007] The technical solution adopted by this utility model is:

[0008] A paraformaldehyde pulverizer, comprising:

[0009] A conical separator, and an inlet, an outlet, a fine material outlet, and a coarse material outlet connected to the separator;

[0010] The upper part of the separator is equipped with a feed baffle, and the inner wall of the feed baffle is equipped with a crushing cone. Multiple crushing cones are arranged in a tower shape. The lower part of the separator is equipped with a discharge baffle, and the upper end of the discharge baffle is equipped with a screen plate. The fine material outlet is connected to the space of the inner ring of the discharge baffle, and the coarse material outlet is connected to the space between the outer ring of the discharge baffle and the conical tank body.

[0011] The lower ends of the fine material outlet and the coarse material outlet are respectively connected to the fine material feeder and the coarse material feeder. The lower end of the coarse material feeder is connected to a mixing mill box. The lower ends of the fine material feeder and the mixing mill box are connected to a conveying auger. A grinder is installed at the end of the conveying auger.

[0012] Furthermore, the feed inlet is located at the center of the upper end of the separator;

[0013] The air outlet is located on the upper side wall of the separator tank;

[0014] The fine material outlet is located at the center of the lower end of the separator;

[0015] The coarse material outlet is located on the lower conical wall of the separator on the side of the fine material outlet.

[0016] Furthermore, the feed inlet extends into the separator and is fitted into a sleeve. The sleeve is hollow and contains a filter screen. Bolts extending outward are provided at the edge of the sleeve. Fixing lugs that are fixed to the bolts are provided on the inner wall of the air outlet.

[0017] Furthermore, the feed baffle is configured as a truncated cone-shaped tube with a downwardly narrowed diameter, and an extension tube is coaxially connected to the lower end of the feed baffle.

[0018] The air outlet is located on the upper side wall of the separator outside the extension tube, and is higher than the lower end of the extension tube.

[0019] Furthermore, a fixing arm is fixedly installed on the inner wall of the extension cylinder. Multiple fixing arms are arranged in a circular array with the central axis of the extension cylinder as the center. The fixing arms are arranged radially and inclined downward with the central axis of the extension cylinder as the center, and the multiple fixing arms are conical. A connecting ring is fixedly installed on the fixing arm. A crushing cone with the tip pointing upward is fixedly installed on the upper end of the fixing arm and the connecting ring respectively.

[0020] Furthermore, the connecting ring is provided with multiple layers, and the crushing cones on the connecting ring are arranged in a circular array along the central axis of the extension cylinder, and multiple crushing cones are arranged in a stacked tower shape on each layer of the connecting ring.

[0021] Furthermore, the discharge baffle is located below the feed baffle;

[0022] The sieve plate is designed as a cone with the tip pointing upwards.

[0023] Furthermore, the discharge port at the lower end of the mixing mill is connected to the middle of the conveying auger.

[0024] Furthermore, a dust exhaust pipe is connected to the air outlet, a dust collector is connected to the end of the dust exhaust pipe, a purification pipe is connected to the dust collector outlet, an induced draft fan is connected to the end of the purification pipe, and an external exhaust pipe is installed at the outlet of the induced draft fan.

[0025] Furthermore, a silencer is installed between the induced draft fan and the external exhaust pipe.

[0026] The beneficial effects of this utility model of a paraformaldehyde pulverizer are as follows:

[0027] The flow rate of raw materials entering the separation tank is increased by an induced draft fan, and the raw materials are made to impact the crushing cone in the lower extension cylinder of the feed baffle for pre-crushing, thereby treating materials that are physically melted and bonded, or that absorb moisture and clump together.

[0028] The crushed material is screened through a sieve plate, and the coarse material after screening is then transported to a mixing mill for further crushing and refining, thereby processing the chemically bonded material.

[0029] The fine material after screening is directly fed to the feeding end of the conveying auger, while the refined coarse material is fed to the middle of the conveying auger. The fine material and the refined coarse material are mixed in the conveying auger to homogenize the particle size of the material. Finally, the material is finely crushed by the grinder, thus ensuring stable pulverization production. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of an example of this utility model;

[0031] Figure 2 This is an example of the utility model. Figure 1 A magnified view of part A in the middle;

[0032] Figure 3 This is a three-dimensional schematic diagram of an example of this utility model.

[0033] In the picture:

[0034] 10. Separator; 111. Feed inlet; 112. Air outlet; 113. Fine material outlet; 114. Coarse material outlet.

[0035] 121. Feed baffle, 122. Crushing cone, 123. Discharge baffle, 124. Screen plate, 131. Fine material feeder.

[0036] 132. Coarse material feeder; 14. Conveying auger; 15. Mixing mill box; 16. Grinding mill.

[0037] 1121. Slip sleeve; 1122. Filter screen; 1123. Bolt; 1124. Fixing lug.

[0038] 1210. Extension tube; 1211. Fixed arm; 1213. Connecting ring.

[0039] 21. Dust exhaust pipe; 22. Purification pipe;

[0040] 3. Dust collector

[0041] 4. Exhaust fan,

[0042] 5. External drainage pipe. Detailed Implementation

[0043] To more clearly and explicitly illustrate the specific implementation objectives and methods of this utility model, the technical solution of this utility model will be fully described below. The described embodiments are only some embodiments of this utility model, not all embodiments. Without creative effort, all other embodiments based on the described embodiments of this utility model are within the protection scope of this utility model.

[0044] This utility model relates to a paraformaldehyde pulverizer, such as... Figure 1-3 As shown, it includes: a separation tank 10 and a dust removal mechanism.

[0045] The separation tank 10 includes: an upper end cap, a partition cylinder, and a conical tank, which are sequentially and sealed from top to bottom.

[0046] The upper end of the head is provided with a feed inlet 111 in the central connection.

[0047] The dividing cylinder includes: a downwardly tapered frustum-shaped feed divider 121, with an extension cylinder 1210 coaxially connected to the lower end of the feed divider 121; a fixing arm 1211 is fixedly installed on the inner wall of the extension cylinder 1210, with multiple fixing arms 1211 arranged in a circular array around the central axis of the extension cylinder 1210, and the fixing arms 1211 are radially inclined downwards around the central axis of the extension cylinder 1210, making the multiple fixing arms 1211 conical; a connecting ring 1213 is fixedly installed on the fixing arm 1211, with multiple connecting rings 1213, and a crushing cone 122 with its tip pointing upwards is fixedly installed on the upper end of the fixing arm 1211 and the connecting ring 1213, with multiple crushing cones 122 arranged in a circular array around the central axis of the extension cylinder 1210, making the crushing cones 122 form a stacked tower shape.

[0048] An air outlet 112 is connected to the upper side wall of the conical tank. The air outlet 112 is located on one side of the partition cylinder and is higher than the lower end of the extension cylinder 1210. The air outlet 112 extends into the conical tank and is fitted with a frame-shaped retainer 1121. A filter screen 1122 is installed in the hollow through-hole of the retainer 1121. Bolts 1123 extending outward from the air outlet 112 are installed at the four corners of the retainer 1121. Fixing ears 1124 are provided on the inner wall of the air outlet 112. The bolts 1123 pass through the fixing ears 1124 and are screwed with nuts to tighten the retainer 1121 to the air outlet 112 extending into the conical tank. A discharge baffle cylinder 123 is coaxially arranged at the bottom of the conical tank. The discharge baffle cylinder 123 is located directly below the feed baffle cylinder 121. A cone-shaped screen plate 124 with its tip pointing upward is provided at the upper end of the discharge baffle cylinder 123. The lower end of the conical tank is connected to a fine material outlet 113 and a coarse material outlet 114. The fine material outlet 113 is located at the center of the lower end of the conical tank and is connected to the space of the inner ring of the discharge baffle 123. The coarse material outlet 114 is located on the lower conical wall of the conical tank on one side of the fine material outlet 113 and is connected to the space between the outer ring of the discharge baffle 123 and the conical tank. The fine material outlet 113 extends downward and is connected to a fine material feeder 131. The lower end of the fine material feeder 131 is connected to a conveying auger 14. The coarse material outlet 114 extends downward and is connected to a coarse material feeder 132. The lower end of the coarse material feeder 132 is connected to a mixing mill box 15. The lower end of the mixing mill box 15 is connected to the middle of the conveying auger 14. A grinder 16 is coaxially arranged at the end of the conveying auger 14.

[0049] Dust removal equipment, including:

[0050] A dust discharge pipe 21 is connected to the air outlet 112. The dust discharge pipe 21 extends downward and is connected to a dust collector 3 at the end. A material recovery box is installed at the lower end of the dust collector 3. A purification pipe 22 is connected to the outlet of the dust collector 3. The purification pipe 22 extends downward and is connected to an induced draft fan 4 at the end. An external discharge pipe 5 is connected to the outlet of the induced draft fan 4 via a silencer.

[0051] Based on the specific structure of the paraformaldehyde pulverizer in the above embodiments, its working process will be further explained below:

[0052] Under the negative pressure of the induced draft fan 4, the raw material enters the separator 10 through the feed inlet 111, enters the extension cylinder 1210 through the feed partition 121, and is pre-crushed by the crushing cone 122.

[0053] The coarsely crushed material is screened through the screen plate 124. The screened coarse material enters the space between the outer ring of the discharge partition cylinder 123 and the conical tank along the surface of the screen plate 124, and then enters the mixing mill box 15 for mixing and crushing through the coarse material feeder 132. The mixed and crushed material enters the conveying auger 14. The screened fine material enters the space of the inner ring of the discharge partition cylinder 123 through the screen holes of the screen plate 124, and then enters the conveying auger 14 through the fine material feeder 131. After mixing with the mixed and crushed material, it is ground in the grinder 16.

[0054] In summary, the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification. All equivalent variations and modifications of the shape, structure, features, and spirit described in the claims of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A paraformaldehyde pulverizer, characterized in that: include: A conical separator (10), and a feed inlet (111), an air outlet (112), a fine material outlet (113), and a coarse material outlet (114) connected to the separator (10). The upper part of the separation tank (10) is provided with a feed baffle (121), and a crushing cone (122) is provided on the inner wall of the feed baffle (121). Multiple crushing cones (122) are arranged in a tower shape. The lower part of the separation tank (10) is provided with a discharge baffle (123), and a screen plate (124) is provided at the upper end of the discharge baffle (123). The fine material outlet (113) is connected to the space of the inner ring of the discharge baffle (123), and the coarse material outlet (114) is connected to the space between the outer ring of the discharge baffle (123) and the conical tank. Fine material outlet (113) and coarse material outlet (114) are respectively connected to fine material feeder (131) and coarse material feeder (132). The coarse material feeder (132) is connected to a mixing mill box (15) at its lower end. The fine material feeder (131) and mixing mill box (15) are connected to a conveying auger (14) at their lower ends. A grinder (16) is provided at the end of the conveying auger (14).

2. The paraformaldehyde pulverizer according to claim 1, characterized in that: The feed inlet (111) is located at the center of the upper end of the separator (10); The air outlet (112) is located on the side wall of the upper part of the separator (10); The fine material outlet (113) is located at the center of the lower end of the separator (10); The coarse material outlet (114) is located on the lower conical wall of the separator (10) on the side of the fine material outlet (113).

3. A paraformaldehyde pulverizer according to claim 1 or 2, characterized in that: The feed inlet (111) extends into the separator (10) and is fitted into the sleeve (1121). The sleeve (1121) is hollow and has a filter screen (1122). The sleeve (1121) has an outwardly extending bolt (1123) at its edge. The air outlet (112) has a fixing lug (1124) on its inner wall that is fixed to the bolt (1123).

4. The paraformaldehyde pulverizer according to claim 3, characterized in that: The feed partition (121) is configured as a truncated cone-shaped tube with a downwardly narrowed diameter, and an extension tube (1210) is coaxially connected to the lower end of the feed partition (121). The air outlet (112) is located on the upper side wall of the separation tank (10) outside the extension cylinder (1210) and is higher than the lower end of the extension cylinder (1210).

5. A paraformaldehyde pulverizer according to claim 4, characterized in that: A fixing arm (1211) is fixedly installed on the inner wall of the extension cylinder (1210). Multiple fixing arms (1211) are arranged in a circular array with the central axis of the extension cylinder (1210) as the center. The fixing arms (1211) are arranged radially and inclined downward with the central axis of the extension cylinder (1210) as the center, and the multiple fixing arms (1211) are conical. A connecting ring (1213) is fixedly installed on the fixing arm (1211). A crushing cone (122) with the tip pointing upward is fixedly installed on the upper end of the fixing arm (1211) and the connecting ring (1213).

6. A paraformaldehyde pulverizer according to claim 5, characterized in that: The connecting ring (1213) is provided with multiple layers. The crushing cone (122) on the connecting ring (1213) is centered along the central axis of the extension cylinder (1210), and multiple crushing cones (122) are arranged in a circular array on each layer of the connecting ring (1213), so that the crushing cone (122) forms a stacked tower shape.

7. A paraformaldehyde pulverizer according to claim 1, characterized in that: The discharge baffle (123) is located below the feed baffle (121); The sieve plate (124) is configured as a cone with the tip pointing upwards.

8. A paraformaldehyde pulverizer according to claim 1, characterized in that: The lower outlet of the mixing mill (15) is connected to the middle of the conveying auger (14).

9. A paraformaldehyde pulverizer according to claim 1, characterized in that: A dust discharge pipe (21) is connected to the air outlet (112), a dust collector (3) is connected to the end of the dust discharge pipe (21), a purification pipe (22) is connected to the outlet of the dust collector (3), an induced draft fan (4) is connected to the end of the purification pipe (22), and an external discharge pipe (5) is provided at the outlet of the induced draft fan (4).

10. A paraformaldehyde pulverizer according to claim 9, characterized in that: A silencer is installed between the induced draft fan (4) and the external exhaust pipe (5).

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