Pretreatment equipment for producing calcium-zinc stabilizer

Abstract

The invention relates to the technical field of raw material pretreatment, in particular to pretreatment equipment for calcium-zinc stabilizer production, which comprises a treatment box, the bottom of the treatment box is coaxially provided with a dirt collection cylinder and a separation cylinder, and the diameter of the separation cylinder is larger than that of the dirt collection cylinder; the cleaning assembly comprises a water storage table and a supporting cylinder which are communicated with each other, the supporting cylinder is movably connected with the dirt collecting cylinder, the water storage table is located at the top of the supporting cylinder, a water inlet pipe is arranged at the top of the water storage table, a guide vane facing the water inlet pipe is arranged on the water storage table, a screen is slidably installed on the supporting cylinder, and a limiting ring for limiting the screen to descend is arranged on the supporting cylinder; a cleaning piece facing the screen is arranged on the supporting cylinder. And the discharging disc is installed on the separating barrel in a sliding mode, a guide column is arranged on the supporting barrel, and a fixing sleeve matched with the guide column is arranged on the discharging disc. Materials are washed through the spray heads, meanwhile, the spray heads assist in rotation of the water storage table, the brush is matched to rotate along with the supporting cylinder to conduct matched washing on the materials, and the washing effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of raw material pretreatment, and in particular to pretreatment equipment for producing calcium zinc stabilizers. Background Art

[0002] Calcium zinc stabilizer is a non-toxic stabilizer synthesized by a special composite process with calcium salt, zinc salt, lubricant, antioxidant as the main components. It can not only replace toxic stabilizers such as lead cadmium salts and organic tin, but also has excellent thermal stability, light stability and transparency.

[0003] Calcium zinc stabilizer needs to be pretreated before production. First, raw materials such as calcium carbonate and zinc oxide are screened to remove impurities and unqualified particles to ensure that the purity and particle size distribution of the raw materials meet the production requirements. The screened raw materials are then washed to remove surface dirt and attachments. The washed raw materials are dried to remove moisture and volatile substances. Finally, the dried raw materials are crushed to make their particle size meet the production requirements. The crushed raw materials are mixed evenly according to the formula ratio.

[0004] At present, when washing and pre-treating the calcium zinc stabilizer before production, the raw materials and water are mostly mixed and stirred together. Although the cleaning speed is fast, the cleaning effect is poor. In addition, the water pipe is directly connected to flush the raw materials on the conveying device. However, since the raw materials are easy to accumulate during transportation, only most of the raw material surfaces can be flushed during flushing, and the flushing of the raw materials is not sufficient, so that the raw materials cannot be cleaned properly, affecting the subsequent production accuracy of the calcium zinc stabilizer. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a pretreatment equipment for the production of calcium zinc stabilizer, which can effectively solve the problems in the prior art such as large limitations on raw material cleaning and insufficient dirt removal, which affect the subsequent production accuracy.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a pretreatment device for producing a calcium zinc stabilizer, comprising: A treatment box, wherein a dirt collecting cylinder and a separation cylinder are coaxially mounted at the bottom of the treatment box, and the diameter of the separation cylinder is larger than the diameter of the dirt collecting cylinder; A cleaning assembly, the cleaning assembly comprising a water storage platform and a support cylinder which are interconnected, the support cylinder being movably connected to the dirt collecting cylinder, and the water storage platform being located at the top of the support cylinder, a water inlet pipe being provided at the top of the water storage platform, and a guide vane facing the water inlet pipe being provided on the water storage platform, a screen being slidably mounted on the support cylinder, and a limiting ring for limiting the descent of the screen being provided on the support cylinder, and a cleaning member facing the screen being provided on the support cylinder; And a discharge plate is slidably mounted on the separation cylinder, the support cylinder is provided with a guide column, and the discharge plate is provided with a fixing sleeve matched with the guide column.

[0007] Furthermore, the separation cylinder is sleeved on the outer peripheral surface of the sewage collecting cylinder, and the sewage collecting cylinder and the separation cylinder divide the bottom of the treatment box into three areas. The area between the separation cylinder and the treatment box is a primary sewage collecting area, the area inside the sewage collecting cylinder is a secondary sewage collecting area, and the area between the sewage collecting cylinder and the separation cylinder is a material collection area, and the primary sewage collecting area and the secondary sewage collecting area are connected through a sewage discharge pipe.

[0008] Furthermore, the water inlet pipe is connected to an external water supply device through a rotating member, and a plurality of guide vanes are provided on one side of the water inlet pipe close to the water storage platform, and the drainage direction of the guide vanes is perpendicular to the setting direction of the water inlet pipe.

[0009] Furthermore, a connecting pipe slidably connected to the water inlet pipe is provided on the top of the water storage platform, and a plurality of groups of water inlet holes 2 are provided on the connecting pipe, and in an initial state, the water inlet holes 2 and the water inlet holes 1 are staggered and distributed.

[0010] Furthermore, the support cylinder is slidably connected to the dirt collecting cylinder, and an elastic part is provided between the support cylinder and the dirt collecting cylinder, the screen is slidably set on the support cylinder, and a fixing part that resists a limiting ring is provided at the bottom of the screen, the screen is in an inverted funnel shape, and the diameter of the screen close to the water storage platform is larger than the diameter of the bottom of the water storage platform.

[0011] Furthermore, the cleaning piece is provided with a brush and a nozzle, the brush faces the screen, the nozzle is provided in multiple groups, and the spraying direction of the nozzle is tangent to the screen.

[0012] Furthermore, the discharge plate is provided with a plurality of drainage grooves distributed in a circular array, the fixed sleeve is provided with a reciprocating guide groove, and the guide column extends into the reciprocating guide groove. When the guide column rotates with the support tube, the reciprocating guide groove drives the fixed sleeve and the discharge plate to swing up and down to screen out the material.

[0013] Furthermore, a drain pan is provided on the separation cylinder, and the drain pan is located between the screen and the discharge pan, and a secondary spray pipe head is provided on the drain pan toward the discharge pan.

[0014] Furthermore, the height at the center of the drain pan is higher than that at the edge, and the diameter of the drain pan is larger than the outer diameter of the separation cylinder and smaller than the inner diameter of the treatment box. The height at the center of the discharge pan is lower than that at the edge, and the diameter of the discharge pan is larger than the outer diameter of the collection cylinder and smaller than the inner diameter of the separation cylinder.

[0015] Beneficial Effects Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects: 1. When the material enters the processing box, the water storage table and guide vanes are used to convert the potential energy of the material's fall into the kinetic energy of the water storage table's rotation, thereby guiding the material to be scattered more evenly on the screen. When there is material on the screen, it will drop due to the increase in weight. The limit ring is used to push the support cylinder and the water storage table down as a whole for a certain distance, so that the water inlet hole 1 on the water inlet pipe and the water inlet hole 2 on the connecting pipe are connected and sprayed from the nozzle to the material for cleaning. The spraying direction of the liquid in the nozzle is tangent to the screen, and the water storage table will be assisted to rotate when the nozzle sprays and washes the raw materials. At this time, the brush will follow the rotation of the support cylinder to wash the material, thereby improving the cleaning effect; 2. Through the special setting of the discharge tray, the sewage generated when the raw materials are cleaned on the screen is discharged into the primary sewage collection area. After the materials enter the discharge tray, they are cleaned for the second time and discharged through the drain trough. Due to the special setting of the discharge tray, the materials and sewage will be concentrated on the discharge tray near the support cylinder. With the cooperation of the fixed sleeve and the guide column, the discharge tray is continuously vibrated with the rotation of the support cylinder, and then the materials are vibrated into the collection area, effectively separating the sewage materials, thereby improving the subsequent production accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a partial cross-sectional schematic diagram of the present invention; Figure 3 It is a schematic diagram of the connection between the water storage platform and the support cylinder of the present invention; Figure 4 For the present invention Figure 3 The enlarged view of point A in the middle; Figure 5 It is a schematic diagram of the connection between the screen and the discharge tray of the present invention; Figure 6 A top view of the connection between the screen and the cleaning member of the present invention; Figure 7 It is a schematic diagram of the connection between the discharge tray and the sewage discharge tray of the present invention.

[0018] Figure numerals: 1. treatment box; 11. sewage collecting cylinder; 12. separation cylinder; 13. sewage pipe; 2. cleaning assembly; 21. water inlet pipe; 211. water inlet hole 1; 22. water storage platform; 221. guide vane; 222. connecting pipe; 2221. water inlet hole 2; 23. support cylinder; 231. cleaning part; 2311. brush; 2312. nozzle; 232. limiting ring; 233. guide column; 24. screen; 241. fixing part; 25. discharge plate; 251. fixing sleeve; 2511. reciprocating guide groove; 252. drain groove; 26. sewage plate. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The present invention will be further described below in conjunction with the embodiments.

[0021] A pretreatment device for the production of calcium zinc stabilizer, refer to the attached Figure 1-7 ,include: A treatment box 1, a sewage collecting cylinder 11 and a separation cylinder 12 are coaxially installed at the bottom of the treatment box 1, and the diameter of the separation cylinder 12 is larger than the diameter of the sewage collecting cylinder 11, wherein the separation cylinder 12 is sleeved on the outer peripheral surface of the sewage collecting cylinder 11, and the sewage collecting cylinder 11 and the separation cylinder 12 divide the bottom of the treatment box 1 into three areas, between the separation cylinder 12 and the treatment box 1 is a primary sewage collecting area, inside the sewage collecting cylinder 11 is a secondary sewage collecting area, between the sewage collecting cylinder 11 and the separation cylinder 12 is an aggregate area, and the primary sewage collecting area and the secondary sewage collecting area are connected by a sewage discharge pipe 13. During the cleaning process of the raw materials, the cleaned materials finally fall into the aggregate area. The treatment box 1 is installed through an external mounting frame, and there is enough space at the bottom to process materials, which is not drawn in the figure. The cleaned sewage enters the primary sewage collecting area and the secondary sewage collecting area respectively, and is finally discharged for centralized collection.

[0022] The cleaning component 2 includes a water storage platform 22 and a support cylinder 23 which are interconnected. The support cylinder 23 is movably connected to the dirt collecting cylinder 11, and the water storage platform 22 is located at the top of the support cylinder 23. The support cylinder 23 is slidably connected to the dirt collecting cylinder 11, and an elastic member is provided between the support cylinder 23 and the dirt collecting cylinder 11. A water inlet pipe 21 is provided at the top of the water storage platform 22, and a guide vane 221 facing the water inlet pipe 21 is provided on the water storage platform 22. After the material continuously enters the processing box 1, it falls on the water storage platform 22 and cooperates with the guide vane 221 to drive the water storage platform 22 to occur. The support cylinder 23 is provided with a screen 24 which is slidably mounted thereon, and a limiting ring 232 for limiting the descent of the screen 24 is provided on the support cylinder 23, and a cleaning member 231 facing the screen 24 is provided on the support cylinder 23, the screen 24 is slidably arranged on the support cylinder 23, and a fixing member 241 for resisting the limiting ring 232 is provided at the bottom of the screen 24, the screen 24 is in the shape of an inverted funnel, and the diameter of the side of the screen 24 close to the water storage platform 22 is larger than the diameter of the bottom of the water storage platform 22, and after there is material on the screen 24, the screen 24 as a whole will drop due to the increase of materials, thereby driving the water storage platform 22 as a whole to drop a certain distance. Since the water inlet pipe 21 is connected to the external water supply device through a rotating member, a plurality of guide vanes 221 are provided on the side of the water inlet pipe 21 close to the water storage platform 22, and the drainage direction of the guide vanes 221 is perpendicular to the setting direction of the water inlet pipe 21. A connecting pipe 222 is provided on the top of the water storage platform 22, which is slidably connected to the water inlet pipe 21, and a plurality of water inlet holes 2221 are provided on the connecting pipe 222, and in the initial state, the water inlet holes 222 1 is staggered with the water inlet hole 1 211. When the water storage platform 22 is lowered as a whole, the connecting pipe 222 and the water inlet pipe 21 will be relatively displaced. At this time, the guide vane 221 is connected with the water inlet hole 2221 to pass the external water into the water storage platform 22, and the cleaning part 231 is used to clean the raw materials. Since the drainage direction of the guide vane 221 is perpendicular to the setting direction of the water inlet pipe 21, before the water storage platform 22 is actively lowered, even if there is pressure in the water inlet pipe 21, the liquid will not push the water storage platform 22, and will not actively enter the water storage platform 22.

[0023] Furthermore, the cleaning piece 231 is provided with a brush 2311 and a nozzle 2312. The brush 2311 is directed toward the screen 24. The nozzle 2312 is provided in multiple groups, and the spraying direction of the nozzle 2312 is tangent to the screen 24. When the water storage platform 22 rotates, the brush 2311 arranged on the cleaning piece 231 will wash the raw materials on the screen 24, and further remove the dirt that cannot be washed away. Due to the special setting of the nozzle 2312, the liquid cannot be washed after being sprayed from the nozzle 2312. Under the reverse thrust of the sprayed liquid, it can also assist the water storage platform 22 to rotate.

[0024] In the above technical scheme, the material enters the processing box 1, and then cooperates with the water storage platform 22 and the guide vane 221 to convert the potential energy of the material falling into the kinetic energy of the water storage platform 22 rotation, and then when the material enters the processing box 1, the multiple sets of guide vanes 221 can scatter the material more evenly on the screen 24. At the same time, since the screen 24 will drop due to the increase in weight when there is material on it, the limiting ring 232 is cooperated to push the support tube 23 and the water storage platform 22 to drop a certain distance as a whole, so that the water inlet hole 1 211 on the water inlet pipe 21 and the water inlet hole 2 2221 on the connecting pipe 222 are connected, the water storage platform 22 is filled with water and sprayed from the nozzle 2312 to the material for cleaning. Since the spraying direction of the liquid in the nozzle 2312 is tangent to the screen 24, the water storage platform 22 will be assisted to rotate when the nozzle 2312 sprays and rinses the raw materials. At this time, the brush 2311 will follow the rotation of the support tube 23 to wash the material, thereby improving the cleaning effect.

[0025] And a discharge plate 25 slidably mounted on the separation cylinder 12, a guide column 233 is provided on the support cylinder 23, and a fixed sleeve 251 matched with the guide column 233 is provided on the discharge plate 25. When the support cylinder 23 rotates, the guide column 233 and the fixed sleeve 251 cooperate to achieve vibration to discharge the material.

[0026] Furthermore, the discharge plate 25 is provided with a plurality of drainage grooves 252 distributed in a circular array, the fixed sleeve 251 is provided with a reciprocating guide groove 2511, and the guide column 233 extends into the reciprocating guide groove 2511. When the guide column 233 rotates following the support tube 23, the reciprocating guide groove 2511 drives the fixed sleeve 251 and the discharge plate 25 to swing up and down to screen out the materials.

[0027] In addition, a drain pan 26 is provided on the separation cylinder 12, and the drain pan 26 is located between the screen 24 and the discharge pan 25, and a secondary spray pipe head is provided on the drain pan 26 facing the discharge pan 25. After cleaning, the material will fall on the discharge pan 25, and the sewage in the raw material will be discharged through the drain trough 252, and the sewage in the raw material will be removed again in cooperation with the secondary spray pipe head provided on the drain pan 26 facing the discharge pan 25.

[0028] It is worth noting that the height of the center of the drain pan 26 is higher than that of the edge, and the diameter of the drain pan 26 is larger than the outer diameter of the separation cylinder 12 and smaller than the inner diameter of the treatment box 1, which is convenient for the drain pan 26 to discharge the sewage flowing out of the screen 24 to the primary sewage collection area. The height of the center of the discharge pan 25 is lower than the height of the edge, which is convenient for discharging the sewage into the secondary sewage collection area, and the diameter of the discharge pan 25 is larger than the outer diameter of the sewage collection cylinder 11 and smaller than the inner diameter of the separation cylinder 12. When the discharge pan 25 shakes back and forth, the material is shaken into the collection area.

[0029] In the above technical scheme, through the special setting of the discharge tray 26, the sewage generated when the raw material is cleaned on the screen 24 is discharged into the primary sewage collection area. After the material enters the discharge tray 25, it is cleaned for the second time, and the sewage is discharged through the drain trough 252. Due to the special setting of the discharge tray 25, the material and sewage will be concentrated on the discharge tray 25 near the support tube 23. At this time, with the cooperation of the fixed sleeve 251 and the guide column 233, the discharge tray 25 is continuously vibrated with the rotation of the support tube 23, and then the material is vibrated into the collection area, effectively separating the sewage material, thereby improving the subsequent production accuracy.

[0030] Working principle: The material is introduced into the processing box 1. At this time, the material falls on the water storage platform 22, and the guide vane 221 is used to convert the potential energy of the material falling into the kinetic energy of the water storage platform 22. Then, while the material continues to enter the processing box 1, the water storage platform 22 is guided to rotate. With the help of multiple sets of guide vanes 221, the material can be scattered more evenly on the screen 24. At this time, since the screen 24 will drop due to the increase in weight when there is material on it, the limit ring 232 is used to push the support cylinder 23 and the water storage platform 22. The water table 22 is lowered as a whole for a certain distance, so that the water inlet hole 1 211 on the water inlet pipe 21 and the water inlet hole 2221 on the connecting pipe 222 are connected, the water storage table 22 is filled with water and sprayed from the nozzle 2312 to the material to wash and clean the material. Since the spraying direction of the liquid in the nozzle 2312 is tangential to the screen 24, the nozzle 2312 will assist the rotation of the water storage table 22 when spraying and washing the raw materials. When the water storage table 22 and the support cylinder 23 rotate, the cleaning member 231 disposed on the cleaning member 231 and close to the cleaning member 231 is provided. The brush 2311 of the screen 24 will rotate with the support tube 23 to wash the material, thereby improving the cleaning effect. Since the screen 24 is funnel-shaped, the material will be guided to flip when it falls from the top of the screen 24 to the bottom, further allowing the material to fully contact with the flushing liquid and the brush 2311. The cleaned material enters the discharge tray 25, and through the special setting of the sewage tray 26, the sewage when the raw material is cleaned on the screen 24 is discharged into the primary sewage collection area. The material after entering the discharge tray 25 is cleaned for the second time, and the sewage is discharged into the sewage collection tube 11 through the drain trough 252. Due to the special setting of the discharge tray 25, the material and sewage will be concentrated on the discharge tray 25 near the support tube 23. Since the support tube 23 rotates all the time during operation, the guide column 233 rotates with the support tube 23 and cooperates with the reciprocating guide groove 2511 on the fixed sleeve 251 to continuously vibrate the discharge tray 25 up and down, thereby vibrating the material into the collection area, effectively separating the sewage material, and thereby improving the subsequent production accuracy.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pretreatment device for the production of calcium zinc stabilizer, characterized in that: include: A treatment box (1), wherein a dirt collecting cylinder (11) and a separation cylinder (12) are coaxially mounted on the bottom of the treatment box (1), and the diameter of the separation cylinder (12) is greater than the diameter of the dirt collecting cylinder (11); A cleaning assembly (2), the cleaning assembly (2) comprising a water storage platform (22) and a support cylinder (23) which are interconnected, the support cylinder (23) being movably connected to the dirt collecting cylinder (11), and the water storage platform (22) being located at the top of the support cylinder (23), a water inlet pipe (21) being provided at the top of the water storage platform (22), and a guide vane (221) facing the water inlet pipe (21) being provided on the water storage platform (22), a screen (24) being slidably mounted on the support cylinder (23), and a limiting ring (232) for limiting the descent of the screen (24) being provided on the support cylinder (23), and a cleaning member (231) facing the screen (24) being provided on the support cylinder (23); and a discharge plate (25) slidably mounted on the separation cylinder (12); a guide column (233) is provided on the support cylinder (23), and a fixing sleeve (251) matched with the guide column (233) is provided on the discharge plate (25).

2. A pretreatment equipment for the production of calcium zinc stabilizer according to claim 1, characterized in that: The separation cylinder (12) is sleeved on the outer peripheral surface of the sewage collecting cylinder (11), and the sewage collecting cylinder (11) and the separation cylinder (12) divide the bottom of the treatment box (1) into three areas, the area between the separation cylinder (12) and the treatment box (1) is a primary sewage collecting area, the area inside the sewage collecting cylinder (11) is a secondary sewage collecting area, and the area between the sewage collecting cylinder (11) and the separation cylinder (12) is a material collecting area, and the primary sewage collecting area and the secondary sewage collecting area are connected via a sewage discharge pipe (13).

3. A pretreatment equipment for the production of calcium zinc stabilizer according to claim 1, characterized in that: The water inlet pipe (21) is connected to an external water supply device via a rotating member, and a plurality of guide vanes (221) are provided on one side of the water inlet pipe (21) close to the water storage platform (22), and the drainage direction of the guide vanes (221) is perpendicular to the setting direction of the water inlet pipe (21).

4. A pretreatment equipment for the production of calcium zinc stabilizer according to claim 3, characterized in that: A connecting pipe (222) slidably connected to the water inlet pipe (21) is provided on the top of the water storage platform (22), and a plurality of groups of water inlet holes (2221) are provided on the connecting pipe (222), and in an initial state, the water inlet holes (2221) and the water inlet holes (211) are staggered.

5. The pretreatment equipment for producing calcium zinc stabilizer according to claim 1, characterized in that: The support cylinder (23) is slidably connected to the dirt collecting cylinder (11), and an elastic member is provided between the support cylinder (23) and the dirt collecting cylinder (11). The screen (24) is slidably arranged on the support cylinder (23), and a fixing member (241) is provided at the bottom of the screen (24) to abut against a limit ring (232). The screen (24) is in an inverted funnel shape, and the diameter of the screen (24) on the side close to the water storage platform (22) is larger than the diameter of the bottom of the water storage platform (22).

6. A pretreatment equipment for the production of calcium zinc stabilizer according to claim 1, characterized in that: The cleaning member (231) is provided with a brush (2311) and a nozzle (2312), the brush (2311) is directed toward the screen (24), a plurality of nozzles (2312) are provided, and the spraying direction of the nozzles (2312) is tangent to the screen (24).

7. A pretreatment equipment for the production of calcium zinc stabilizer according to claim 1, characterized in that: The discharge plate (25) is provided with a plurality of drain grooves (252) distributed in a circular array, the fixed sleeve (251) is provided with a reciprocating guide groove (2511), and the guide column (233) extends into the reciprocating guide groove (2511). When the guide column (233) rotates with the support cylinder (23), the reciprocating guide groove (2511) drives the fixed sleeve (251) and the discharge plate (25) to swing up and down, thereby screening out the materials.

8. The pretreatment equipment for producing calcium zinc stabilizer according to claim 1, characterized in that: The separation cylinder (12) is provided with a drain pan (26), and the drain pan (26) is located between the screen (24) and the discharge pan (25), and the drain pan (26) is provided with a secondary spray pipe head facing the discharge pan (25).

9. A pretreatment device for the production of calcium zinc stabilizer according to claim 8, characterized in that: The height of the center of the drain pan (26) is higher than that of the edge, and the diameter of the drain pan (26) is larger than the outer diameter of the separation barrel (12) and smaller than the inner diameter of the treatment box (1); the height of the center of the discharge pan (25) is lower than that of the edge, and the diameter of the discharge pan (25) is larger than the outer diameter of the collection barrel (11) and smaller than the inner diameter of the separation barrel (12).

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