Improved underwater pelletizing die head

Abstract

The utility model discloses an improved underwater pelletizing die head, which relates to the technical field of pelletizer accessories and comprises a die head body, material channels are symmetrically arranged at one end of the die head body, a discharge plate is movably connected to one end of the die head body, and discharge holes are symmetrically arranged at one end of the discharge plate. Fixing columns are symmetrically and fixedly connected to the outer side wall of the die head body through an annular circumferential array, connecting plates are symmetrically and fixedly connected to the outer side walls of the fixing columns, assembling blocks are fixedly connected to one ends of the connecting plates, fixing assemblies are installed in the assembling blocks, and positioning blocks are symmetrically and fixedly connected to the outer side wall of the discharging plate through an annular circumferential array; positioning assemblies are installed at one ends of the positioning blocks. By the adoption of the structure, direct contact between materials and the discharging end face of the die head can be effectively isolated, so that abrasion of impurities or particles in molten materials to the discharging end face is reduced, the service life of the die head is prolonged, the direct contact area between the materials can be reduced, and the possibility of particle adhesion is reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of pelletizer accessories, and specifically relates to an improved underwater pelletizing die head. Background Technology

[0002] Underwater pelletizing is a polymer semi-finished product processing technology. Its working principle involves molten polymer being extruded from a die and immediately cooled in water, then cut into pellets by rotating blades. These pellets are then carried out of the pelletizing chamber by circulating water and enter a centrifugal drying system for dehydration and drying, ultimately yielding finished pellets. The pelletizing die is one of the core components of an underwater pelletizer; it is responsible for extruding the molten polymer from the extruder and cutting it into pellets underwater by rotating blades. The die typically consists of a die body, die holes, heating holes, and a pelletizing belt. The die holes are the channels for the molten polymer extrusion, the heating holes are used to heat the molten polymer with heating rods, and the pelletizing belt is the core part of the die, where the high-temperature molten polymer is pelletized by high-speed rotating blades after extrusion.

[0003] Announcement No. "CN220409307U" discloses an underwater pelletizing die head for easily cutting uniform spherical particles. The die head includes mounting holes and slots, with a flow-dividing cone inserted into the slot. Bolts are provided between the bottom of the die head and the flow-dividing cone. By setting a heat-insulating sleeve on the inner wall of the material channel and a funnel-shaped exit port, the molten raw material flowing in the material channel is insulated. Simultaneously, the molten raw material forms a spherical initial blank when flowing out of the exit port, improving the effect of subsequent cutting and foaming of the molten raw material into uniform spherical particles. Furthermore, by setting a corresponding first guide groove on the flow-dividing cone and a corresponding second guide groove on the die head, and by setting a smooth layer structure on the inner wall of the two guide grooves, the guiding efficiency of the flow-dividing cone in directing the molten raw material to each material channel is improved.

[0004] Although the above-mentioned utility model improves the guiding efficiency of the diversion cone in directing the molten raw material to each material channel by opening a corresponding first guide groove on the diversion cone and a corresponding second guide groove on the die head, and setting a smooth layer structure on the inner wall of the two guide grooves, the material will directly contact the discharge end face of the die head during the extrusion process. This will lead to increased wear of the die head, especially when the material contains hard particles or impurities. Over time, the wear of the die head will seriously affect its service life and increase the cost of replacement and maintenance. Utility Model Content

[0005] In view of the problems mentioned in the background art, the purpose of this utility model is to provide an improved underwater pelletizing die head to solve the problem that the material will directly contact the discharge end face of the die head during the extrusion process, which will lead to accelerated wear of the die head. In particular, when the material contains hard particles or impurities, the wear of the die head will seriously affect its service life and increase the cost of replacement and maintenance in the long run.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] An improved underwater pelletizing die includes a die body, with mounting holes symmetrically arranged in a circular array at one end of the die body, and a material channel symmetrically arranged in a circular array at the other end of the die body. A discharge plate is movably connected to one end of the die body, and a discharge hole is symmetrically arranged in a circular array at one end of the discharge plate, which communicates with the material channel. A fixing column is symmetrically fixedly connected to the outer wall of the die body in a ring-shaped array, and a connecting plate is symmetrically fixedly connected to the outer wall of the fixing column. An assembly block is fixedly connected to one end of the connecting plate, and a fixing component is installed inside the assembly block. A positioning block is symmetrically fixedly connected to the outer wall of the discharge plate in a ring-shaped array, and a positioning component is installed at one end of the positioning block.

[0008] The fixing assembly includes a cavity, a first return spring, a movable plate, and a locking block. The cavity is located inside the assembly block. A first return spring is symmetrically fixed to one end of the cavity, and a movable plate is fixedly fixed to the other end of the first return spring. The movable plate is slidably connected to the cavity. A locking block is fixedly connected to the end of the movable plate away from the first return spring. The end of the locking block away from the movable plate extends out of the side of the assembly block, and the bottom of the locking block is sloped. Fixing blocks are symmetrically fixed to the outer wall of the discharge plate via a circular array. One end of each fixing block has an assembly hole, and the assembly block and assembly hole are inserted into each other. A locking groove is formed inside the assembly hole, and the locking groove and locking block are engaged. This effectively isolates the material from direct contact with the discharge end face of the die head, thereby reducing wear on the discharge end face caused by impurities or particles in the molten material, extending the service life of the die head, and reducing the direct contact area between materials, thus reducing the possibility of particle adhesion.

[0009] As a preferred technical solution, an unlocking block is slidably connected inside the locking groove. The end of the unlocking block away from the locking block extends to the side end of the fixing block. Limiting blocks are symmetrically fixedly connected at both ends of the unlocking block. Limiting grooves are symmetrically opened inside the locking groove. The limiting grooves and the limiting blocks are slidably connected, which allows the operator to easily remove the discharge plate for thorough cleaning and descaling, thereby keeping the discharge plate clean and unobstructed.

[0010] As a preferred technical solution, the positioning component includes a built-in hole, a second return spring, and a positioning post. One end of the positioning block has a built-in hole, and one end of the built-in hole is fixedly connected to the second return spring. The other end of the second return spring is fixedly connected to the positioning post. The positioning post is slidably connected to the inside of the built-in hole. The end of the positioning post away from the second return spring extends out of the side of the positioning block and is designed as an arc surface. One end of the positioning post has a positioning groove, which is inserted into the positioning block. One end of the positioning groove has a positioning hole, which is snap-fitted into the positioning post. This design guides the material discharge plate to be correctly placed on the die head, preventing deviations or misalignments caused by improper installation. This helps ensure that the material passes through the discharge hole evenly and stably during the cutting process, thereby improving cutting efficiency and particle quality.

[0011] As a preferred technical solution, a receiving groove is provided at the end of the die head body away from the discharge plate, and a flow-diverting cone is movably connected inside the receiving groove, which helps to guide the flow of molten material in the die head.

[0012] As a preferred technical solution, threaded holes are symmetrically opened at one end of the die head body and one end of the diversion cone body. The threaded holes are connected to fixing bolts. The diversion cone and the receiving groove are plugged in, which allows the operator to easily remove the diversion cone for thorough cleaning, thereby keeping the diversion cone clean and unobstructed and avoiding obstruction of material flow.

[0013] In summary, the present invention has the following main advantages:

[0014] In this invention, the discharge plate is merged with one end of the die head body, and the positioning block is inserted into the positioning groove. At the same time, the assembly block is inserted into the assembly hole of the fixing block. During the insertion of the assembly block, the extrusion force applies pressure to the inclined surface of one end of the locking block, causing the locking block to drive the moving plate to press against the first return spring. The first return spring is compressed, and the locking block retracts into the cavity. When the locking block moves to the locking groove, the first return spring resets, and the moving plate rebounds, causing the locking block to pop out. The locking block and the locking groove are locked together, completing the installation and fixing of the discharge plate. This effectively isolates the material from direct contact with the discharge end face of the die head, thereby reducing the wear of impurities or particles in the molten material on the discharge end face, extending the service life of the die head, and reducing the direct contact area between materials, thus reducing the possibility of particle adhesion. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0016] Figure 2 This is a three-dimensional structural diagram of the other side of this utility model;

[0017] Figure 3 This is a cross-sectional perspective view of the fixing component of this utility model.

[0018] Figure 4 This is a cross-sectional three-dimensional structural diagram of the positioning component of this utility model.

[0019] Reference numerals: 1. Die head body; 2. Receiving groove; 3. Diverting cone; 4. Threaded hole; 5. Fixing bolt; 6. Mounting hole; 7. Material channel; 8. Fixing post; 9. Positioning groove; 10. Connecting plate; 11. Discharge plate; 12. Discharge hole; 13. Fixing block; 14. Assembly block; 15. Assembly hole; 16. Fixing component; 161. Cavity; 162. First return spring; 163. Moving plate; 164. Locking block; 17. Locking groove; 18. Limiting block; 19. Limiting groove; 20. Positioning block; 21. Positioning component; 211. Internal hole; 212. Second return spring; 213. Positioning post; 22. Positioning hole; 23. Unlocking block. Detailed Implementation

[0020] Example

[0021] refer to Figures 1 to 4 This embodiment describes an improved underwater pelletizing die head, comprising a die head body 1. One end of the die head body 1 has mounting holes 6 symmetrically arranged in a circular circumferential array. One end of the die head body 1 also has a material channel 7 symmetrically arranged in a circular circumferential array. One end of the die head body 1 is movably connected to a discharge plate 11. One end of the discharge plate 11 has a discharge hole 12 symmetrically arranged in a circular circumferential array, which communicates with the material channel 7. The outer wall of the die head body 1 is symmetrically fixedly connected to a fixing column 8 via a ring-shaped circumferential array. The outer wall of the fixing column 8 is symmetrically fixedly connected to a connecting plate 10. One end of the connecting plate 10 is fixedly connected to an assembly block 14. The assembly block 14 contains a fixing component 16. The outer wall of the discharge plate 11 is symmetrically fixedly connected to a positioning block 20 via a ring-shaped circumferential array. One end of the positioning block 20 is equipped with a positioning component 21.

[0022] The fixing assembly 16 includes a cavity 161, a first return spring 162, a movable plate 163, and a locking block 164. The cavity 161 is formed inside the assembly block 14. The first return spring 162 is symmetrically fixedly connected to one end of the cavity 161, and the movable plate 163 is fixedly connected to the other end of the first return spring 162. The movable plate 163 is slidably connected to the cavity 161. The locking block 164 is fixedly connected to the end of the movable plate 163 away from the first return spring 162. The locking block 164 extends from the side of the assembly block 14 away from the movable plate 163, and its bottom end is sloped. Fixing blocks 13 are symmetrically fixedly connected to the outer wall of the discharge plate 11 via a circular array. One end of each fixing block 13 has an assembly hole 15, and the assembly block 14 is inserted into the assembly hole 15. A locking groove 17 is provided at one end of the hole 15. The locking groove 17 is engaged with the locking block 164. The discharge plate 11 is merged with one end of the die head body 1, so that the positioning block 20 is inserted into the positioning groove 9. At the same time, the assembly block 14 is inserted into the assembly hole 15 of the fixing block 13. During the insertion of the assembly block 14, the extrusion force applies pressure to the inclined surface of one end of the locking block 164, so that the locking block 164 drives the moving plate 163 to press against the first return spring 162. The first return spring 162 is compressed, and the locking block 164 retracts into the cavity 161. When the locking block 164 moves to the locking groove 17, the first return spring 162 returns to its original position, and the moving plate 163 rebounds, causing the locking block 164 to pop out. The locking block 164 is engaged with the locking groove 17 and fixed, thus completing the installation and fixing of the discharge plate 11.

[0023] refer to Figure 3 An unlocking block 23 is slidably connected inside the locking groove 17. The end of the unlocking block 23 away from the locking block 164 extends out to the side end of the fixing block 13. Limiting blocks 18 are symmetrically fixedly connected at both ends of the unlocking block 23. Limiting grooves 19 are symmetrically opened inside the locking groove 17. The limiting grooves 19 and the limiting blocks 18 are slidably connected. Pushing the unlocking block 23 causes it to slide inside the locking groove 17. The unlocking block 23 drives the limiting blocks 18 to slide inside the limiting grooves 19. The unlocking block 23 pushes the locking block 164, causing the locking block 164 to drive the moving plate 163 to press against the first return spring 162. The first return spring 162 is compressed, and the locking block 164 retracts into the cavity 161. The locking block 164 and the locking groove 17 are no longer engaged. Pulling the discharge plate 11 causes the assembly block 14 to be no longer inserted into the assembly hole 15, thus completing the disassembly of the discharge plate 11.

[0024] refer to Figure 4The positioning component 21 includes an internal hole 211, a second return spring 212, and a positioning post 213. One end of the positioning block 20 has an internal hole 211. The second return spring 212 is fixedly connected to one end of the internal hole 211, and the other end of the second return spring 212 is fixedly connected to the positioning post 213. The positioning post 213 is slidably connected to the internal hole 211. The end of the positioning post 213 away from the second return spring 212 extends out of the side of the positioning block 20 and is designed as an arc surface. One end of the fixing post 8 has a positioning groove 9, which is inserted into the positioning block 20. One end of the positioning groove 9 has a positioning hole 22. Hole 22 and positioning post 213 are snapped together. The discharge plate 11 and one end of the die head body 1 are merged together, so that the positioning block 20 is inserted into the positioning groove 9. During the insertion of the positioning block 20, the squeezing force applies pressure to the arc-shaped surface of one end of the positioning post 213, so that the positioning post 213 presses against the second return spring 212. The second return spring 212 is compressed, and the positioning post 213 retracts into the inner hole 211. When the positioning post 213 moves to the positioning hole 22, the second return spring 212 is reset, the positioning post 213 pops out, and the positioning post 213 is snapped and fixed with the positioning hole 22, thus completing the positioning of the discharge plate 11 during installation.

[0025] refer to Figure 1 The die head body 1 has a receiving groove 2 at the end away from the discharge plate 11. A flow divider cone 3 is movably connected inside the receiving groove 2. The flow divider cone 3 helps to guide the flow of molten material in the die head.

[0026] refer to Figure 2 Both the die head body 1 and the diverter cone 3 have symmetrically opened threaded holes 4 at one end and fixed bolts 5 inside the threaded holes 4. The diverter cone 3 and the receiving groove 2 are inserted into each other. The diverter cone 3 is inserted into the mounting groove at one end of the die head body 1 so that the threaded hole 4 at one end of the diverter cone 3 is aligned with the threaded hole 4 on the die head body 1. Then, the fixed bolts 5 are threadedly connected to the threaded hole 4 to complete the installation and fixation of the diverter cone 3.

[0027] Operating principle and advantages: First, the discharge plate 11 is joined to one end of the die head body 1, so that the positioning block 20 is inserted into the positioning groove 9. At the same time, the assembly block 14 is inserted into the assembly hole 15 of the fixing block 13. During the insertion of the positioning block 20, the extrusion force applies pressure to the arc-shaped surface of one end of the positioning post 213, so that the positioning post 213 presses against the second return spring 212. The second return spring 212 is compressed, and the positioning post 213 retracts into the inner hole 211. When the positioning post 213 moves to the positioning hole 22, the second return spring 212 returns to its original position, and the positioning post 213 pops out. The positioning post 213 and the positioning... Hole 22 is used for snap-fit ​​fixation, completing the positioning of the discharge plate 11 during installation. During the insertion of assembly block 14, the extrusion force applies pressure to one end of the inclined surface of locking block 164, causing locking block 164 to drive moving plate 163 to press against first return spring 162. First return spring 162 is compressed, and locking block 164 retracts into cavity 161. When locking block 164 moves to locking groove 17, first return spring 162 resets, moving plate 163 rebounds and causes locking block 164 to pop out. Locking block 164 is snap-fitted and fixed with locking groove 17, completing the installation and fixation of discharge plate 11.

[0028] This invention can effectively isolate the material from direct contact with the discharge end face of the die head, thereby reducing the wear of impurities or particles in the molten material on the discharge end face, extending the service life of the die head, and reducing the direct contact area between materials, thereby reducing the possibility of particle adhesion.

Claims

1. An improved underwater pelletizing die, comprising a die body (1), characterized in that: The die head body (1) has mounting holes (6) symmetrically arranged in a circular circumferential array at one end, and a material channel (7) symmetrically arranged in a circular circumferential array at one end. The die head body (1) is movably connected to a discharge plate (11), and a discharge hole (12) symmetrically arranged in a circular circumferential array at one end. The discharge hole (12) is connected to the material channel (7). A fixing column (8) is symmetrically fixedly connected to the outer wall of the die head body (1) in a ring circumferential array. A connecting plate (10) is symmetrically fixedly connected to the outer wall of the fixing column (8). An assembly block (14) is fixedly connected to one end of the connecting plate (10). A fixing component (16) is installed inside the assembly block (14). A positioning block (20) is symmetrically fixedly connected to the outer wall of the discharge plate (11) in a ring circumferential array. A positioning component (21) is installed at one end of the positioning block (20). The fixing component (16) includes a cavity (161), a first return spring (162), a moving plate (163), and a locking block (164). The assembly block (14) has a cavity (161) inside. The first return spring (162) is symmetrically fixedly connected to one end of the cavity (161). The moving plate (163) is fixedly connected to the other end of the first return spring (162). The moving plate (163) is slidably connected to the cavity (161). The locking block (164) is fixedly connected to the end of the moving plate (163) away from the first return spring (162). The locking block (164) extends from the side end of the assembly block (14) away from the moving plate (163). The bottom end of the locking block (164) is set as an inclined surface.

2. The improved underwater pelletizing die head according to claim 1, characterized in that: The outer wall of the discharge plate (11) is symmetrically fixed with fixing blocks (13) in a ring-shaped array. One end of the fixing block (13) is provided with an assembly hole (15). The assembly block (14) is inserted into the assembly hole (15). One end of the assembly hole (15) is provided with a locking groove (17). The locking groove (17) is snapped into the locking block (164).

3. An improved underwater pelletizing die head according to claim 2, characterized in that: The locking groove (17) is slidably connected to an unlocking block (23). The end of the unlocking block (23) away from the locking block (164) extends to the side end of the fixing block (13). The two ends of the unlocking block (23) are symmetrically fixedly connected to limit blocks (18). The locking groove (17) is symmetrically opened with limit grooves (19). The limit grooves (19) and the limit blocks (18) are slidably connected.

4. An improved underwater pelletizing die head according to claim 1, characterized in that: The positioning component (21) includes an internal hole (211), a second reset spring (212), and a positioning post (213). The positioning block (20) has an internal hole (211) at one end. The second reset spring (212) is fixedly connected to one end of the internal hole (211), and the positioning post (213) is fixedly connected to the other end of the second reset spring (212). The positioning post (213) is slidably connected to the internal hole (211). The end of the positioning post (213) away from the second reset spring (212) extends out of the side of the positioning block (20) and is set as an arc surface.

5. An improved underwater pelletizing die head according to claim 1, characterized in that: The fixed column (8) has a positioning groove (9) at one end, which is inserted into the positioning block (20). The positioning groove (9) has a positioning hole (22) at one end, which is snapped into the positioning column (213).

6. An improved underwater pelletizing die head according to claim 1, characterized in that: The die head body (1) has a receiving groove (2) at one end away from the discharge plate (11), and a diversion cone (3) is movably connected inside the receiving groove (2).

7. An improved underwater pelletizing die head according to claim 1, characterized in that: The die head body (1) and the diverter cone (3) body are symmetrically provided with threaded holes (4), and the threaded holes (4) are threaded with fixing bolts (5). The diverter cone (3) and the receiving groove (2) are inserted into each other.

Images