An underwater pelletizer water chamber capable of eliminating sticking

Abstract

This application discloses a water chamber for an underwater pelletizer that eliminates blade sticking, relating to the field of underwater pelletizer technology. It not only reduces the large eddy current at the center of the cutter head but also increases the water pressure around the cutters, reducing blade sticking and allowing water to be quickly discharged outside the water chamber, thus improving working efficiency. The underwater pelletizer water chamber includes a pelletizing chamber; a cutter head structure is rotatably connected inside the pelletizing chamber; the cutter head structure includes a cutter head holder and multiple cutters mounted on the cutter head holder; multiple water guide holes are provided on the end face of the cutter head holder connecting to the cutters, and a water guide annular groove is provided inside; a central hole is provided on the cutter head holder, and multiple radial water channels communicating with the water guide annular groove are provided on the side wall of the central hole; a cutter inlet hole is provided on the end face of the cutter contacting the cutter head holder; a cutter flow channel extending along the length direction of the cutter is provided inside the cutter; multiple cutter outlet holes are provided on the thick side end of the cutter, arranged sequentially along the length direction of the cutter; the cutter flow channel connects the cutter inlet hole and the cutter outlet hole; the cutter inlet hole connects to the water guide hole.

Description

Technical Field

[0001] This application relates to the field of underwater pelletizer technology, and more particularly to an underwater pelletizer water chamber that can eliminate blade sticking. Background Technology

[0002] An underwater pelletizer is a device used to process polymer raw materials, such as polyolefins, into granules. The cutter head structure is a crucial part of the underwater pelletizer, its function being to cut the polymer raw materials into particles of the required size for subsequent processing and use. To extend the service life of the cutters, underwater pelletizer blades are typically made of materials such as high-speed steel or cemented carbide, possessing high hardness and wear resistance. The structure and shape of the cutters vary depending on factors such as the type, size, and shape of the polymer to be processed, ensuring optimal cutting results and efficiency. Currently, most underwater pelletizers have straight-in and straight-out water inlets and outlets, and the cutter head structure lacks water holes. This results in a large vortex generated at the center of the cutter head during operation, further causing polymer to stick to the blades. This prevents polymer particles from quickly exiting the pelletizing water chamber, potentially leading to blade jamming, motor damage, and a significant reduction in efficiency. Summary of the Invention

[0003] The embodiments of this application provide an underwater pelletizer water chamber that can eliminate blade sticking. While being able to cut polyolefin filaments into processable pellets, it not only reduces the large eddy current at the center of the cutter disc, but also increases the water pressure around the cutter, thereby providing stronger power for polyolefin pelletizing, reducing blade sticking, and quickly discharging the pellets out of the water chamber, greatly improving work efficiency.

[0004] To achieve the above objectives, embodiments of this application provide a water chamber for an underwater pelletizer capable of eliminating blade sticking, comprising a pelletizing chamber; a cutter disc structure is rotatably connected inside the pelletizing chamber; the cutter disc structure includes a cutter disc holder and a plurality of cutters disposed on the cutter disc holder; the end face of the cutter disc holder connected to the cutters is provided with a plurality of water guide holes, and an internal water guide annular groove is provided that communicates with all of the plurality of water guide holes; a central hole is provided at the center of the cutter disc holder, and a plurality of radial water channels communicating with the water guide annular groove are provided on the side wall of the central hole; a cutter inlet hole is provided on the end face of the cutter that contacts the cutter disc holder; a cutter flow channel is provided inside the cutter along the length direction of the cutter; a plurality of cutter outlet holes are provided on the thick side end of the cutter arranged sequentially along the length direction of the cutter; the cutter flow channel connects the cutter inlet hole and the cutter outlet hole; the cutter inlet hole connects to the water guide hole.

[0005] Furthermore, a drive shaft is provided between the pelletizing chamber and the cutter head holder; the right end of the drive shaft is connected to the pelletizing chamber via a bearing, and the left end is connected to the cutter head holder.

[0006] Furthermore, the pelletizing chamber has a hollow structure; a connecting sleeve is provided inside the pelletizing chamber; the outer side of the connecting sleeve is sealed to the inner wall of the pelletizing chamber, and the bearing is provided between the inner hole of the connecting sleeve and the right end of the drive shaft.

[0007] Furthermore, the cutter head holder includes a connecting plate; the back side of the connecting plate protrudes outward to form a connecting portion; the connecting plate has a stepped hole; the connecting portion has a through hole; the left end of the drive shaft passes through the through hole and the stepped hole and is connected to the end face of the connecting plate.

[0008] Furthermore, the drive shaft includes an optical shaft and a connecting seat connected in series along the axial direction; the connecting seat has a central water hole; the side wall of the central water hole has a plurality of radial water holes communicating with the outside; the connecting seat includes a connecting plate, a flow section and a connecting segment arranged sequentially along the axial direction; a portion of the central water hole is located on the connecting plate and another portion is located on the flow section; the radial water holes are located on the flow section; the connecting plate is connected to the end of the connecting plate by screws; the connecting segment is connected to the optical shaft by a tapered pin.

[0009] Furthermore, multiple sets of cutter connection holes are evenly distributed circumferentially on the end face of the connecting plate; the number of cutter connection hole sets is equal to the number of water guide holes; each set of cutter connection hole sets includes two cutter connection holes, the two cutter connection holes are respectively located on both sides of the corresponding water guide hole, and the angle between the center of the connecting plate and the line connecting the two cutter connection holes is 23°; the cutter is also provided with two cutter bolt holes that penetrate along the thickness direction; the positions of the two cutter bolt holes correspond one-to-one with the positions of the two cutter connection holes; the bolt passes through the cutter bolt holes and the cutter connection holes in sequence and is then tightened with the nut.

[0010] Furthermore, the number of the cutter connection hole groups is twenty-four.

[0011] Furthermore, the pelletizing chamber has a water inlet at the lower end and a water outlet at the upper end; the water inlet is inclined at 60° to the horizontal plane and cuts into the lower wall of the pelletizing chamber, and the water outlet is inclined outward at 5° towards the port of the cutter head structure.

[0012] Furthermore, the pelletizing chamber is provided with a feeding template near the port of the cutter head structure; multiple template grooves are evenly distributed along the circumference of the feeding template; a template feeding hole is provided at the bottom of the template groove; the template groove is located near the edge of the feeding template.

[0013] Furthermore, the outer side of the connecting sleeve is sealed to the inner wall of the pelletizing chamber by an annular connecting plate, and the end face of the connecting sleeve is lower than the end face of the pelletizing chamber.

[0014] This application has the following advantages over the prior art:

[0015] 1. The underwater pelletizer water chamber of this application can eliminate blade sticking by opening water channels and grooves on the cutter head, which facilitates the rapid entry of water into the cutter and reduces the eddy current in the center of the cutter head. The water outlet hole on the thick wall side of the cutter helps to increase the back water pressure of the cutter and reduce the sticking of polyolefin pellets to the cutter, thereby enabling the polyolefin pellets to leave the cutter quickly and be discharged from the pelletizing chamber as soon as possible, which greatly improves the pelletizing efficiency of the underwater pelletizer.

[0016] 2. The underwater pelletizer water chamber of this application embodiment can eliminate blade sticking. By changing the inlet angle of the pelletizing chamber, the inlet jet is reduced, which enables the polyolefin pellets to rotate with the cutter disc, reducing the relative movement between the polyolefin pellets and the cutter disc; by adding an inclined angle to the outlet of the pelletizing chamber, it is more conducive to the rapid discharge of polyolefin pellets from the pelletizing chamber. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front sectional view of the water chamber of an underwater pelletizer that can eliminate blade sticking, according to an embodiment of this application.

[0019] Figure 2 This is a three-dimensional structural diagram of the water chamber of an underwater pelletizer that can eliminate blade sticking according to an embodiment of this application;

[0020] Figure 3 This is a three-dimensional structural diagram of the water chamber of the underwater pelletizer that can eliminate blade sticking according to an embodiment of this application;

[0021] Figure 4 This is a schematic diagram of the internal structure of the water chamber of an underwater pelletizer that can eliminate blade sticking, according to an embodiment of this application.

[0022] Figure 5 This is a three-dimensional structural diagram of the cutter head holder in the water chamber of an underwater pelletizer that can eliminate blade sticking, according to an embodiment of this application.

[0023] Figure 6 This is a side view of the cutter head holder in the water chamber of an underwater pelletizer that can eliminate blade sticking, according to an embodiment of this application.

[0024] Figure 7 This is a cross-sectional view of the cutter head holder in the water chamber of an underwater pelletizer that can eliminate blade sticking, according to an embodiment of this application.

[0025] Figure 8 This is a three-dimensional structural diagram of the cutter in the water chamber of an underwater pelletizer that can eliminate blade sticking, according to an embodiment of this application.

[0026] Figure 9 This is a cross-sectional view of the cutter in the water chamber of an underwater pelletizer that can eliminate blade sticking, according to an embodiment of this application.

[0027] Figure 10 for Figure 9 A magnified view of a section at point I;

[0028] Figure 11 This is a three-dimensional structural diagram of the drive shaft in the water chamber of an underwater pelletizer that can eliminate blade sticking, according to an embodiment of this application.

[0029] Figure 12 This is a cross-sectional view of the drive shaft in the water chamber of an underwater pelletizer that can eliminate blade sticking, according to an embodiment of this application. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly, for example, as fixed connection, detachable connection, or integral connection; those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0034] Reference Figure 1 This application provides an underwater pelletizer water chamber capable of eliminating blade sticking, comprising a pelletizing chamber 1, a cutter head structure 2, and a feeding template 3. A drive shaft 4 is provided between the pelletizing chamber 1 and the cutter head structure 2, with its right end rotatably connected to the pelletizing chamber 1 and its left end detachably connected to the cutter head structure 2. The feeding template 3 is connected to the left end port of the pelletizing chamber 1 and is located outside the cutter head structure 2.

[0035] Specifically, the pelletizing chamber 1 has a hollow cylindrical structure. The lower end of the pelletizing chamber 1 has a water inlet 11, and the upper end has a water outlet 12. Both the water inlet 11 and the water outlet 12 are located on the outer surface of the pelletizing chamber 1, with the water inlet 11 inclined at 60° to the horizontal plane and cut into the lower wall of the pelletizing chamber 1, and the water outlet 12 inclined outward at 5° towards the port of the cutter head structure 2. This inclination of the water inlet 11 reduces the inlet jet, allowing the pellets to rotate better with the cutter head structure 2 and be transported to the water outlet 12. The inclination of the water outlet 12 further facilitates the discharge of polyolefin pellets from the underwater pelletizer's water chamber.

[0036] Reference Figure 1 and Figure 2 The pelletizing chamber 1 is also equipped with a connecting sleeve 13. The middle of the outer side of the connecting sleeve 13 is sealed to the inner wall of the pelletizing chamber 1 by an annular connecting plate 14, and the end face of the connecting sleeve 13 is lower than the end face of the pelletizing chamber 1. The lower inner end of the annular connecting plate 14 is lower than the upper outer end, forming a funnel shape. A support bearing 5 is placed between the inner hole of the connecting sleeve 13 and the right end of the drive shaft 4 to reduce the friction between them.

[0037] Reference Figure 4 The cutter head structure 2 includes a cutter head holder 21 and twenty-four cutting blades 22 connected to the cutter head holder 21. For details, refer to... Figure 6 The cutter head holder 21 includes a connecting disc 211 and a connecting portion 212 formed by an outward protrusion on the back side of the connecting disc 211. (See reference...) Figure 1 , Figure 5 and Figure 7 The cutter head holder 21 is provided with a central hole, which includes a stepped hole 213 located in the center of the connecting plate 211 and a through hole 219 located in the center of the connecting part 212.

[0038] Reference Figure 5 and Figure 7 Twenty-four sets of cutter connection holes 216 are evenly distributed circumferentially on the end face of the connecting plate 211 that connects to the cutter 22. Each set of cutter connection holes 216 includes two cutter connection holes 217, and the angle between the center of the connecting plate 211 and the line connecting the two cutter connection holes 217 is 23°.

[0039] The connecting plate 211 has twenty-four circumferentially distributed water guide holes 210 on the end face of the connecting cutter 22. The water guide holes 210 are located between two cutter connecting holes 217 in the same group. The interior of the connecting plate 211 has a water guide ring groove 214 that communicates with all twenty-four water guide holes 210. The side wall of the stepped hole 213 of the connecting plate 211 has multiple radial water channels 215 that communicate with the water guide ring groove 214. The multiple radial water channels 215 are also evenly distributed along the circumference of the connecting plate 211.

[0040] Reference Figures 8 to 10 The cutter 22 is also provided with two cutter bolt holes 221 that run through the thickness direction. The positions of the two cutter bolt holes 221 correspond one-to-one with the positions of the two cutter connecting holes 217 on the connecting plate 211. The bolt passes through the cutter bolt holes 221 and the cutter connecting holes 217 in sequence and is then tightened with the nut.

[0041] The cutter 22 has a cutter inlet hole 222 on its end face that contacts the connecting plate 211. The cutter 22 has a cutter flow channel 223 extending along its length. The thick side of the cutter 22 has multiple cutter outlet holes 224 arranged sequentially along its length. These outlet holes 224 extend along the width of the cutter 22 and are blind holes. The cutter flow channel 223 connects the cutter inlet hole 222 and the cutter outlet holes 224. The cutter inlet hole 222 communicates with the corresponding water guide hole 210.

[0042] Reference Figure 1 The right end of the drive shaft 4 passes through the through hole 219 and the stepped hole 213 and is connected to the end face of the connecting plate 211 by four bolts.

[0043] Specifically, refer to Figure 11 and Figure 12 The drive shaft 4 includes an optical shaft 41 and a connecting seat 42 connected in series along the axial direction. The connecting seat 42 has a central water hole 421, and its sidewall has multiple radial water holes 422 communicating with the outside. The connecting seat 42 includes a connecting plate 423, a flow passage 424, and a connecting section 425 arranged sequentially along the axial direction. A portion of the central water hole 421 is located on the connecting plate 423, and another portion is located on the flow passage 424. The radial water holes 422 are located on the flow passage 424. The connecting plate 423 is connected to the end of the connecting disc 211 by four bolts. Specifically, refer to... Figure 5 The connecting plate 211 has four first end face connecting holes 218 on its end face, which are evenly distributed around the outer periphery of the stepped hole 213. (Refer to...) Figure 11 The end face of the connecting plate 423 is provided with four second end face connecting holes 426. (Refer to...) Figure 1The bolt passes through the second end face connection hole 426 on the connecting plate 423 and is then fastened to the connecting disc 211. The connecting section 425 is connected to the right end of the optical axis 41 by a tapered pin, and the left end of the optical axis 41 extends out of the connecting sleeve 13 and is connected to the motor (not shown in the figure).

[0044] Reference Figure 3 Multiple template grooves 31 are evenly distributed along the circumference of the upper edge of the feeding template 3. The bottom of the template groove 31 is provided with a template feeding hole 32. The template groove 31 is located near the edge of the feeding template 3.

[0045] The working principle of the water chamber of an underwater pelletizer that can eliminate blade sticking, according to an embodiment of this application, is as follows:

[0046] When in use, the motor of the underwater pelletizer is started first. The motor drives the transmission shaft 4, which in turn causes the cutter head 21 and cutter 22 inside the pelletizing chamber 1 to rotate at high speed. When the entire equipment is running normally, water is supplied through the water inlet 11 of this embodiment. At the same time, the hot melt furnace connected to the left side of this embodiment will send the heated and molten polyolefin plastic into the water chamber of the underwater pelletizer through the template feed hole 32 on the feed template 3. At this time, the polyolefin plastic forms fine filaments, which are cut into cylindrical particles by the high-speed rotating cutter 22 inside the water chamber of the underwater pelletizer. At this time, the water introduced into the inlet 11 of this embodiment will impact the cut polyolefin particles, thereby sending the polyolefin particles out from the outlet 12 into the drying chamber for drying. The water guide groove, central hole and water channel on the cutter head 21 will reduce the adsorption capacity of the cutter head 21 and reduce the vortex formed in the center of the cutter head 21. The cutter outlet hole on the side wall of the cutter 22 will increase the back water pressure of the cutter 22, thereby causing the polyolefin pellets to be quickly discharged from the pelletizing chamber 1.

[0047] This invention's pelletizing device can cut polyolefin filaments produced in a heating and melting furnace into pellets. During the cutting process, it not only eliminates polyolefin pellets sticking to the cutter and prevents pellet accumulation, but also allows water to enter the cutter at extremely high speed, increasing the rapid impact on the polyolefin pellets and thus enabling the pellets to be quickly discharged from the pelletizing water chamber. This pelletizing device reduces particle accumulation caused by sticking to the cutter, greatly accelerates the discharge speed of pellets from the water chamber, fundamentally solves the problem of cutter jamming, and improves the production efficiency of polyolefin pelletizing.

[0048] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An underwater pellet mill water chamber that eliminates sticking, characterized by, The granulating chamber is provided with a cutter disc structure connected rotatably inside; the cutter disc structure comprises a cutter disc holder and a plurality of cutters arranged on the cutter disc holder; a plurality of water guide holes are arranged on the end surface of the cutter disc holder connected with the cutters, and a water guide ring groove is arranged inside and communicated with the water guide holes; a central hole is arranged in the center of the cutter disc holder, and a plurality of radial water channels are arranged on the side wall of the central hole and communicated with the water guide ring groove; a cutter water inlet hole is arranged on the end surface of the cutter contacting the cutter disc holder; a cutter flow channel extending along the length direction of the cutter is arranged inside the cutter; a plurality of cutter water outlet holes are arranged on the thick side end of the cutter and arranged sequentially along the length direction of the cutter; the cutter flow channel is communicated with the cutter water inlet hole and the cutter water outlet hole; the cutter water inlet hole is communicated with the water guide hole. The cutter disc holder comprises a connecting disc; the back side of the connecting disc is outwardly protruded to form a connecting part; a stepped hole is arranged inside the connecting disc; a through hole is arranged inside the connecting part; the left end of the transmission shaft is connected with the end surface of the connecting disc after passing through the through hole and the stepped hole. A plurality of cutter connecting hole groups are uniformly distributed along the circumferential direction on the end surface of the connecting disc; the number of the cutter connecting hole groups is equal to the number of the water guide holes; each cutter connecting hole group comprises two cutter connecting holes, the two cutter connecting holes are respectively located on the two sides of the corresponding water guide hole, and the included angle between the center of the connecting disc and the connecting line of the two cutter connecting holes is 23°; two cutter bolt holes penetrating along the thickness direction are further arranged on the cutter; the positions of the two cutter bolt holes correspond to the positions of the two cutter connecting holes one by one; the bolt is fastened with a nut after sequentially passing through the cutter bolt hole and the cutter connecting hole. The lower end of the granulating chamber is provided with a water inlet, and the upper end is provided with a water outlet; the water inlet is inclined at an angle of 60° with the horizontal plane and cut on the lower wall of the granulating chamber, and the water outlet is outwardly inclined at an angle of 5° to the port direction close to the cutter disc structure.

2. The underwater pellet mill water chamber with removable sticking knife of claim 1, wherein, The granulating chamber and the cutter disc holder are provided with a transmission shaft; the right end of the transmission shaft is connected with the granulating chamber through a bearing, and the left end is connected with the cutter disc holder.

3. The underwater pellet mill water chamber with removable sticking knife of claim 2, wherein, The granulating chamber is a hollow structure; a connecting sleeve is arranged inside the granulating chamber; the outer side surface of the connecting sleeve is sealingly connected with the inner wall of the granulating chamber, and the inner hole of the connecting sleeve and the right end of the transmission shaft are provided with the bearing.

4. The underwater pellet mill water chamber with removable sticking knife of claim 3, wherein, The transmission shaft comprises an optical axis and a connecting seat connected in series along the axial direction; a central water hole is arranged inside the connecting seat; a plurality of radial water holes communicated with the outside are arranged on the side wall of the central water hole; the connecting seat comprises a connecting plate, a flow passing section and a connecting section arranged sequentially along the axial direction; part of the central water hole is located on the connecting plate, and the other part is located on the flow passing section; the radial water holes are located on the flow passing section; the connecting plate is connected on the end of the connecting disc through a screw; the connecting section and the optical axis are connected through a conical pin.

5. The underwater pellet mill water chamber with removable sticking knife of claim 4, wherein, The number of the cutter connecting hole groups is twenty-four groups.

6. The underwater pellet mill water chamber with removable sticking knife of claim 1, wherein, The cutting chamber is provided with a feeding template near the port of the cutter head structure; a plurality of template grooves are uniformly distributed on the feeding template in the circumferential direction; the bottom of the template groove is provided with a template feeding hole; and the template groove is arranged near the edge of the feeding template.

7. The underwater pellet mill water chamber with removable sticking knife of claim 3, wherein, The outer side surface of the connecting sleeve is sealingly connected with the inner wall of the cutting chamber through an annular connecting plate, and the end surface of the connecting sleeve is lower than the end surface of the cutting chamber.

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