Water-cooling brace pelletizing structure for rubber and plastic

Abstract

The utility model relates to the technical field of pelletizers, and discloses a water-cooling brace pelletizing structure for rubber and plastic, which comprises a pelletizer and a cutter shaft mounted in the pelletizer, a driving motor is mounted at one end of the cutter shaft, the top of the pelletizer is designed to be open, a machine head is connected to the top of the pelletizer, and the cutter shaft is connected with the machine head. A feeding groove inclining downwards is formed in one side of the machine head, a discharging opening is formed in the side, close to the cutter shaft, of the feeding groove, a plurality of cutter rests are fixedly connected to the outer wall of the cutter shaft, blades are connected to one sides of the cutter rests, the blades are tangent to the bottom of the discharging opening when rotating, and a plurality of material distributing grooves are formed in the side, close to the feeding groove, of the discharging opening. According to the water-cooling brace pelletizing structure for rubber and plastic, the material distributing grooves are formed in the discharging opening, so that when entering the discharging opening, plastic strips are separated through the multiple material distributing grooves, the problem that when being pelletized, the plastic strips are gathered at a certain position, and consequently a certain position of a blade is abraded too fast is solved, and the using effect of the blade is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pelletizers, and specifically relates to a water-cooled strip cutting structure for rubber and plastics. Background Technique

[0002] Plastic extruders belong to one of the types of rubber and plastic machinery; according to the angle between the material flow direction of the head and the center line of the screw, the head can be divided into a right-angle head, an oblique-angle head, etc., which can enable the material to be fully plasticized and evenly mixed, and formed through the die. However, because rubber and plastic processing requires heating rubber and plastic to facilitate its plasticity, when the semi-finished rubber and plastic products are processed, they need to be water-cooled and shaped. After the raw materials are heated and plasticized inside the extruder, they are extruded through the die in a strip shape, and fall into the water-cooling tank, and are pulled out from the water tank through the traction device to maintain their continuity and stability. Subsequently, the solidified plastic strip is sent into the pelletizer for cutting, and cut into uniformly sized particles according to requirements. Since the pelletizer cuts the plastic strip a large number of times, during the pelletizing operation, the replacement of the pelletizer blade is relatively frequent, and the maintenance and replacement cost of the blade is relatively high.

[0003] For example, the patent announcement No. CN215094880U discloses a hob for a cemented carbide plastic pelletizer, including a tool shaft and a plurality of blades. An installation block is provided on the blade, a plurality of tool grooves matching the blades are opened on the tool shaft, and an installation groove matching the installation block is opened at the bottom of the tool groove. The plurality of installation blocks are respectively inserted into the plurality of installation grooves, and one end of the tool shaft is detachably connected with an annular installation plate through a connecting piece, and the installation block abuts between the installation plate and the groove wall of the installation groove. Workers can replace a certain damaged blade separately, saving the cost when replacing the hob, thereby reducing the production cost of the pelletizer.

[0004] However, the cutting structure in the above technology still has the following problems:

[0005] Although the above technology replaces a certain damaged blade separately, saving the cost of replacing the hob, it is found in actual pelletizing production that the wear position of the blade is relatively fixed, concentrated in the middle position where the plastic strip passes through, and the wear of the blade on both sides where the plastic strip passes through less is less, reducing the use efficiency of the blade. Content of the Utility Model

[0006] Aiming at the deficiencies of the prior art, the utility model provides a water-cooled strip cutting structure for rubber and plastics, such as: making the position where the plastic strip passes through the blade more uniform, making the wear of the blade more uniform, and improving the utilization effect of the blade.

[0007] To achieve the above object, the present utility model provides the following technical solution: A water-cooled strand pelletizing structure for rubber and plastics, including a pelletizing machine and a cutter shaft installed in the pelletizing machine. A driving motor is installed at one end of the cutter shaft. The top of the pelletizing machine is designed with an opening, and a machine head is connected to the top of the pelletizing machine. An inclined downward feeding trough is provided on one side of the machine head. A blanking port is provided on the side of the feeding trough close to the cutter shaft. A plurality of tool holders are fixedly connected to the outer wall of the cutter shaft. One side of each of the plurality of tool holders is connected with a blade. When the plurality of blades rotate, they are all tangent to the bottom of the blanking port. A plurality of material distribution grooves are opened on the side of the blanking port close to the feeding trough.

[0008] Further, an installation groove is penetrated through the side wall of the blade, and a plurality of threaded holes are penetrated through the side wall of the tool holder. Bolts are connected in the plurality of threaded holes. The threaded rods of the plurality of bolts all pass through the installation groove and are respectively threadedly connected with the plurality of threaded holes. One side of the nut of each of the plurality of bolts close to the threaded rod abuts against the blade.

[0009] Further, two symmetrically arranged limiting blocks are fixedly connected to the side of the tool holder close to the blade. Both of the two limiting blocks are slidably connected with the installation groove.

[0010] Further, the two limiting blocks respectively correspond to both ends of the blanking port, and the slidable distance of the installation groove between the two limiting blocks is close to the width of the material distribution groove.

[0011] Further, the distance between adjacent two of the material distribution grooves is close to the width of the material distribution groove.

[0012] Further, one side of the machine head close to the feeding trough is hinged to the pelletizing machine through a plurality of hinges.

[0013] Compared with the prior art, the present utility model has the following beneficial effects:

[0014] For this water-cooled strand pelletizing structure for rubber and plastics, by providing material distribution grooves on the blanking port, when the plastic strips enter the blanking port, through the plurality of material distribution grooves, multiple plastic strips are separated, thereby reducing the problem that the plastic strips gather at a certain place during pelletizing, resulting in excessive wear of a certain part of the blade, and improving the use effect of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall external connection structure of the present utility model;

[0016] Figure 2 is a schematic diagram of the overall external connection structure of another form of the present utility model;

[0017] Figure 3 is based on Figure 1 is a schematic cross-sectional view of the connection structure of the machine head part;

[0018] Figure 4 Cross-sectional schematic diagram of the connection structure of the machine head part based on Figure 1 ;

[0019] Figure 5 Schematic diagram of the connection structure between the cutter shaft and the blade of the present utility model;

[0020] Figure 6 Schematic diagram of another form of the connection structure between the cutter shaft and the blade of the present utility model;

[0021] Figure 7 Explosion schematic diagram of the connection structure between a single blade and the cutter shaft based on Figure 6 ;

[0022] Figure 8 Side view explosion side view of the connection structure between the cutter shaft and multiple blades of the present utility model.

[0023] In the figure: 1, pelletizer; 2, cutter shaft; 3, drive motor; 4, tool holder; 5, blade; 6, bolt; 7, machine head; 8, limit block; 401, threaded hole; 501, installation groove; 701, feed groove; 702, discharge opening; 703, material distribution groove. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0025] Please refer to Figure 1 - Figure 8 , a water-cooled strip pelletizing structure for rubber and plastics, including a pelletizer 1 and a cutter shaft 2 installed in the pelletizer 1. A drive motor 3 is installed at one end of the cutter shaft 2. The top of the pelletizer 1 is designed to be open, and the top of the pelletizer 1 is connected to a machine head 7. An inclined downward feed groove 701 is provided on one side of the machine head 7. A discharge opening 702 is provided on the side of the feed groove 701 close to the cutter shaft 2. A plurality of tool holders 4 are fixedly connected to the outer wall of the cutter shaft 2. One side of each of the plurality of tool holders 4 is connected to a blade 5. When the plurality of blades 5 rotate, they are all tangent to the bottom of the discharge opening 702. A plurality of material distribution grooves 703 are provided on the side of the discharge opening 702 close to the feed groove 701.

[0026] As shown in Figure 1 - Figure 8 , a water-cooled strip pelletizing structure for rubber and plastics in the present utility model is similar to the existing water-cooled strip pelletizing structure for rubber and plastics. For example, a hob for a cemented carbide plastic pelletizer disclosed in a patent with the publication number CN215094880U. The main improvement point of the present utility model is to improve the use effect of the hob blade 5, reduce the consumption of the blade 5, and reduce the cost of replacing the blade 5. As shown in Figures 1 to 8As shown in the figure, when the water-cooled strand pelletizing structure for rubber and plastic in the present utility model is in use, when the cooled plastic strip passes through the feeding groove 701 on the machine head 7 and enters the blanking port 702 downward, through the multiple dividing grooves 703 on the side of the blanking port 702, multiple plastic strips can be separated, thus avoiding the aggregation of multiple plastic strips within a certain range of the blanking port 702 during the cutting process, resulting in excessive wear at a certain position of the lower blade 5 during the pelletizing process, while the wear at other positions is relatively light, leading to frequent replacement of the blade 5. Through the separation of the dividing grooves 703, the wear of the blade 5 during the pelletizing process is more uniform, improving the use effect of the blade 5, reducing the replacement frequency of the blade 5, reducing the use cost. Among them, the driving motor 3 drives multiple tool holders 4 installed on the tool shaft 2 and the blades 5 installed on the tool holders 4 to rotate through the tool shaft 2, so as to perform pelletizing operations on the plastic strips falling in the blanking port 702.

[0027] As Figure 5 - Figure 8 shown, an installation groove 501 is penetrated through the side wall of the blade 5, and a number of threaded holes 401 are penetrated through the side wall of the tool holder 4. Bolts 6 are connected in the number of threaded holes 401. The threaded rods of the number of bolts 6 all pass through the installation groove 501 and are respectively threadedly connected with the number of threaded holes 401. The nuts of the number of bolts 6 are all abutted against the blade 5 on the side close to the threaded rod. When installing the blade 5 on the tool holder 4, the blade 5 is attached to the tool holder 4, and the bolts 6 are used to pass through the installation groove 501 and are connected and tightened with the threaded holes 401 on the tool holder 4. With the cooperation of the nuts of the bolts 6, the blade 5 is clamped and fixed on the tool holder 4 to complete the installation of the blade 5.

[0028] As Figure 5 - Figure 8 shown, two symmetrically arranged limit blocks 8 are fixedly connected to the side of the tool holder 4 close to the blade 5. Both of the two limit blocks 8 are slidably connected with the installation groove 501. Through the two limit blocks 8 on the tool holder 4, and during installation, the installation groove 501 of the blade 5 is sleeved on the two limit blocks 8, so that the position of the installed blade 5 is more accurate and the use is safer and more stable.

[0029] As Figure 5 - Figure 8As shown, the two limit blocks 8 respectively correspond to both ends of the blanking port 702, and the slidable distance of the installation groove 501 between the two limit blocks 8 is close to the width of the material distribution groove 703. The two limit blocks 8 are respectively arranged at both ends of the corresponding blanking port 702, so that both ends of the installed blade 5 can cover both ends of the blanking port 702, avoiding that the plastic strips at both ends of the blanking port 702 cannot be cut. And during installation, the ends of the installation grooves 501 in multiple blades 5 can be simultaneously abutted against the limit block 8 at the same end. During the granulation operation, the cutting edges of the opposite blades 5 will gradually wear during the granulation process. When the granulation requirements cannot be met, the blade 5 can be loosened by the bolt 6, and the blade 5 can be slid through the installation groove 501 towards the limit block 8 at the other end, so that the position of the blade 5 is staggered compared with the original position, making the worn cutting edge position misaligned between two adjacent material distribution grooves 703, and the unworn cutting edge position originally between two adjacent material distribution grooves 703 is misaligned below the material distribution groove 703, and it is fixed with the bolt 6, so that the blade 5 can be used again, further improving the use efficiency of the blade 5, reducing the frequency of replacing the blade 5, and reducing the use cost of the blade 5.

[0030] As Figure 5 - Figure 8 shown, the distance between two adjacent material distribution grooves 703 is close to the width of the material distribution groove 703. The width between the two material distribution grooves 703 is close to the width of the material distribution groove 703, so that the width of the cutting edge at the worn position of the blade 5 during granulation is close to the width of the unworn cutting edge, so that when the blade 5 is used in a staggered manner, it is ensured that the granulation effect will not change.

[0031] As Figure 1 - Figure 4 shown, one side of the machine head 7 close to the feeding groove 701 is hinged to the granulator 1 through a plurality of hinges. By connecting and installing the machine head 7 and the granulator 1 through hinges, when adjusting the position of the blade 5 or replacing the blade 5, the machine head 7 can be turned upwards from the granulator 1, so as to expose the cutting structure inside the granulator 1, facilitating the adjustment and replacement installation of the blade 5.

[0032] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention.

Claims

1. A water-cooled strand pelletizing structure for rubber and plastic, comprising a pelletizer (1) and a knife shaft (2) installed in the pelletizer (1), wherein a drive motor (3) is installed at one end of the knife shaft (2), and characterized in that: The top of the pelletizer (1) is designed to be open, and a head (7) is connected to the top of the pelletizer (1), a feed trough (701) inclined downward is provided on one side of the head (7), a discharge port (702) is provided on the side of the feed trough (701) close to the knife shaft (2), a plurality of knife holders (4) are fixedly connected to the outer wall of the knife shaft (2), a blade (5) is connected to one side of each of the plurality of knife holders (4), and the plurality of blades (5) are tangent to the bottom of the discharge port (702) when rotating, and a plurality of material distribution troughs (703) are provided on the side of the discharge port (702) close to the feed trough (701).

2. The water-cooled strand pelletizing structure for rubber and plastic according to claim 1, characterized in that: The side wall of the blade (5) is provided with a mounting groove (501), and the side wall of the blade holder (4) is provided with a plurality of threaded holes (401). Bolts (6) are connected to the threaded holes (401). The threaded rods of the bolts (6) pass through the mounting groove (501) and are respectively threadedly connected to the threaded holes (401). The nuts of the bolts (6) are in contact with the blade (5) on one side close to the threaded rod.

3. The water-cooled strand pelletizing structure for rubber and plastic according to claim 2, characterized in that: Two symmetrically arranged limit blocks (8) are fixedly connected to one side of the tool holder (4) close to the blade (5), and both limit blocks (8) are slidably connected to the mounting groove (501).

4. The water-cooled strand pelletizing structure for rubber and plastic according to claim 3, characterized in that: The two limit blocks (8) correspond to the two ends of the material discharge port (702) respectively, and the sliding distance of the installation groove (501) between the two limit blocks (8) is close to the width of the material distribution groove (703).

5. A water-cooled strand pelletizing structure for rubber and plastic according to claim 1, 2, 3 or 4, characterized in that: The distance between two adjacent material distribution grooves (703) is close to the width of the material distribution grooves (703).

6. A water-cooled strand pelletizing structure for rubber and plastic according to claim 1, 2, 3 or 4, characterized in that: The side of the machine head (7) close to the feed chute (701) is hinged to the pelletizer (1) via a plurality of hinges.

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