Crushing equipment for injection molding leftover materials

Abstract

The invention provides injection molding leftover material smashing equipment, and belongs to the technical field of plastic recycling, the injection molding leftover material smashing equipment comprises a rotating cutter assembly, a cutter groove and a material conveying mechanism, the rotating cutter assembly comprises a rotating shaft, a driving unit, a hobbing cutter and a hooking cutter, and the material conveying mechanism comprises an internal channel and an external pipeline; the internal channel comprises a hobbing cutter cavity, a hooked cutter cavity communicated with the hobbing cutter cavity, a crushing cavity and a containing cavity; the crushing cavity is communicated with the hook knife cavity, an arc-shaped baffle is fixedly installed between the crushing cavity and the containing cavity, an air outlet hole is formed in the baffle, and a crushing knife is arranged in the crushing cavity; the external pipeline comprises a draught fan, an air draft pipeline connected between an air inlet of the draught fan and the containing cavity, and an air conveying pipeline connected with an air outlet of the draught fan and the hob cavity. Under the action of wind power, materials falling into the containing cavity can enter the smashing cavity and are smashed through the smashing cutters, the materials can be blown to move in the axial direction of the rotating shaft, the multiple hobs jointly participate in smashing of the materials, and the material smashing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of plastic recycling, and in particular to a device for crushing injection molding scraps. Background Art

[0002] In the process of injection molding, a large amount of scraps, waste materials, nozzle materials, etc. are often generated. When processing these materials, especially when processing harder injection nozzle materials, crushing equipment is often used for crushing. Existing crushing equipment is mainly based on the principle of mechanical cutting and crushing. The hook knife first hooks the larger and longer nozzle materials into small pieces, and then the crushing knife crushes the hooked small pieces of materials to achieve the purpose of recycling and reuse.

[0003] For example, the patent document with the announcement number CN213860190U discloses a knife box structure of an optical resin lens crusher, including a box body, a rotating shaft, and a knife assembly. The knife assembly includes a rotating knife assembly and a fixed knife assembly. The fixed knife assembly is fixed to the inner walls of both sides of the box body. The rotating knife assembly is fixedly connected to the rotating shaft, and the rotating knife assembly and the fixed knife assembly are adapted to each other. The rotating knife assembly includes a plurality of rollers and hook knives, and the hook knives are coaxially arranged between adjacent rollers. The knife box structure cuts off larger materials by the hook knives, and then cuts them by the rollers, thereby improving the crushing efficiency of larger materials. A containing box adapted to the hook knives is provided at the lower end of the box body. The containing box is an arc-shaped box. The materials entering the containing box are transferred out of the containing box along with the broken surface of the hook knives, and are cut and crushed by the rollers.

[0004] The knife box structure is provided with a storage box for accommodating the material interrupted by the hook knife. As the hook knife rotates, the material is transferred out of the storage box and cut and crushed by the roller. However, since the roller is located on one side of the storage box, part of the material transferred out of the storage box may continue to rotate in the storage box with the hook knife, and not move to the roller to be crushed, resulting in residual material in the storage box. Therefore, it is necessary to develop a crushing device for injection molding scraps to solve the technical problem of residual material in the storage chamber in the prior art. Summary of the invention

[0005] In view of this, the present invention provides a crushing device for injection molding scraps, which can make the materials falling into the receiving chamber enter the crushing chamber under the action of wind force and be crushed by a crushing knife, thereby solving the technical problem of residual materials in the receiving chamber in the prior art.

[0006] In order to solve the above technical problems, the present invention provides a crushing device for injection molding scraps, comprising a rotating knife assembly arranged in a box body and knife grooves fixedly arranged on both sides of the box body, the rotating knife assembly comprising a rotating shaft rotatably connected to the box body, a driving unit driving the rotating shaft to rotate, a roller and a hook knife arranged at intervals along the axial direction of the rotating shaft, a material conveying mechanism is arranged in the box body, the material conveying mechanism comprises an internal channel and an external pipeline, the internal channel comprises a roller cavity arranged in the rotating shaft and whose axis is colinear with the axis of the rotating shaft, a hook knife cavity arranged on the rotating shaft and connected with the roller cavity, a crushing cavity and a containing cavity arranged on the box body and located below the rotating shaft and corresponding to the roller cavity and the hook knife cavity respectively; the crushing cavity is connected with the hook knife cavity, an arc-shaped baffle is fixedly installed between the crushing cavity and the containing cavity, an air outlet is arranged at a position of the baffle close to the outer wall of the rotating shaft, the rotating shaft is installed in the baffle, and the baffle blocks a part of the wind in the hook knife cavity, a crushing knife for crushing the material in the crushing cavity is arranged in the crushing cavity, and a discharge port is arranged below the crushing cavity; The external pipeline includes a fan, an air exhaust pipeline connecting the air inlet of the fan and the accommodating chamber, and an air supply pipeline connecting the air outlet of the fan and the hob chamber.

[0007] By adopting the above technical scheme, the present invention can not only make the material falling into the accommodating chamber enter the crushing chamber under the action of wind force, and be crushed by the crushing knife, but also can blow the material to move along the axial direction of the rotating shaft at the roller cutter position, so that multiple roller cutters participate in the crushing of the material together, thereby improving the efficiency of material crushing. Specifically, the driving unit drives the rotating shaft to rotate, and then drives the hook cutter and the roller cutter to rotate, and the material to be crushed is put into the box body, and the hook cutter and the side wall of the accommodating chamber cooperate to first crush the larger material into multiple small segments, and the roller cutter and the knife groove cooperate to crush the material. In the process of the hook cutter crushing the material, the material falling into the accommodating chamber enters the exhaust duct under the suction action of the fan, and after reaching the fan, it enters the air supply duct through the blowing action of the fan, passes through the roller cutter chamber and the hook cutter chamber in sequence, and reaches the crushing chamber. Since the crushing chamber is located below the rotating shaft, the centrifugal force of the rotating shaft drives the material in the crushing chamber to rotate, and the material contacts the crushing knife and the roller cutter in the crushing chamber, and the crushing knife and the roller cutter crush the material, and the crushed material is discharged from the discharge port. At the same time, the wind output by the air supply pipeline passes through the roller cutter chamber and the hook cutter chamber in turn. The baffle blocks part of the wind in the hook cutter chamber, and the other part of the wind passes through the connecting part of the hook cutter chamber and the crushing chamber and the air outlet. The wind passing through the connecting part of the hook cutter chamber and the crushing chamber blows the material into the crushing chamber, and the wind passing through the air outlet blows the material at the roller cutter position on the rotating shaft to move forward, so that the material moves along the axial direction of the rotating shaft at the roller cutter position, reducing the accumulation of material near the hook cutter position, allowing multiple rollers to participate in the crushing of the material together, and improving the efficiency of material crushing.

[0008] Preferably, a plurality of annular hook knife cylinders are fixedly mounted on the rotating shaft, a hook knife cavity is formed between the hook knife cylinder and the rotating shaft, an air outlet is provided at a position of the hook knife cylinder on the rotating shaft to communicate with the hook knife cavity and the rolling knife cavity, one end of the hook knife cylinder is fixedly connected to the outer wall of the rotating shaft, and the other end is provided with an opening to communicate with the hook knife cavity and the crushing cavity, the hook knife is fixedly mounted on the outer wall of the hook knife cylinder, and the rolling knife is fixedly mounted on the outer wall of the rotating shaft between the two hook knife cylinders.

[0009] By adopting the above technical solution, an air outlet is provided on the rotating shaft, so that the hook knife chamber and the roller knife chamber are connected, so that the material in the roller knife chamber enters the hook knife chamber, and the other end of the hook knife cylinder is opened, so that the hook knife chamber and the crushing chamber are connected, so that the material in the hook knife chamber enters the crushing chamber, and the material is crushed under the action of the crushing knife. The hook knife cylinder and the roller knife on the rotating shaft are arranged at intervals, so that the hook knife and the roller knife are arranged at intervals, so that the hook knife crushes the material and the roller knife crushes the material.

[0010] Preferably, the baffle is installed at the opening of the hook knife cylinder and is rotatably connected to the inner wall of the hook knife cylinder. A discharge port is provided at the lower end of the baffle to communicate with the hook knife chamber and the crushing chamber.

[0011] By adopting the above technical scheme, the baffle is rotatably installed at the opening of the hook knife cylinder, so that the baffle blocks a part of the wind in the hook knife chamber. At the same time, a discharge port is opened at the lower end of the baffle to connect the hook knife chamber and the crushing chamber, so that the wind and material in the hook knife chamber reach the crushing chamber through the discharge port, and the material is crushed by the crushing knife in the crushing chamber. The wind in the crushing chamber can also cool the crushing knife and the roller, thereby reducing the material adhering to the crushing knife and the roller.

[0012] Preferably, at least two hook cutters are provided, evenly distributed in the circumference of the hook cutter cylinder; a plurality of roller cutters are evenly distributed along the axial direction of the rotating shaft, a plurality of roller cutters parallel to the axial direction of the rotating shaft is a roller cutter group, and a plurality of roller cutter groups are evenly distributed in the circumference of the rotating shaft.

[0013] By adopting the above technical solution, two or more hook cutters alternately crush the material, thereby improving the crushing efficiency. A plurality of roller cutters are also provided, and the plurality of roller cutter groups are evenly distributed around the circumference of the rotating shaft, and the plurality of roller cutters can crush the material, thereby improving the crushing efficiency.

[0014] Preferably, a first sieve hole is provided at the lower portion of the crushing chamber, and a second sieve hole is provided at the lower portion of the accommodating chamber. Both the first sieve hole and the second sieve hole are connected to the discharge port, and the materials in the crushing chamber and the accommodating chamber fall into the discharge port through the first sieve hole and the second sieve hole respectively.

[0015] By adopting the above technical solution, the first sieve hole and the second sieve hole can screen the material. When the material is crushed by the roller cutter and falls into the crushing chamber from the cutter groove, if the material meets the size requirements, it can fall into the discharge port through the first sieve hole and be discharged. If the material does not meet the size requirements, it will be crushed again by the crushing knife until it can fall into the discharge port through the first sieve hole and be discharged. The material that falls into the containing chamber after being crushed by the hook knife can fall into the discharge port through the second sieve hole and be discharged if it meets the size requirements. If it does not meet the requirements, it will enter the crushing chamber and be crushed by the crushing knife until it can fall into the discharge port through the first sieve hole and be discharged.

[0016] Preferably, two hook knives are arranged in parallel on the hook knife cylinder along the axial direction of the rotating shaft, the two hook knives form a hook knife group, and at least two hook knife groups are evenly distributed in the circumference of the hook knife cylinder. The side of the accommodating chamber and the crushing chamber that is close to the rotation direction of the rotating shaft is the crushing side, and a block is provided in the accommodating chamber on the crushing side, dividing the accommodating chamber into two parts to accommodate the two hook knives.

[0017] By adopting the above technical solution, the two hook cutters are arranged in parallel along the axial direction of the rotating shaft and cooperate with the stopper to break the material into multiple small segments, thereby improving the crushing efficiency.

[0018] Preferably, the crushing knives are arc-shaped and are arranged at intervals along the axial direction of the rotating shaft on the side of the crushing chamber away from the crushing side. The knife grooves include a roller cutter groove between the two crushing knives for allowing the roller cutter to pass through, and a feeding knife groove arranged in the crushing chamber on the crushing side.

[0019] By adopting the above technical solution, the feed cutter groove is used to cooperate with the roller cutter, which is conducive to the roller cutter crushing the material. At the same time, the crushed material falls from the feed cutter groove into the crushing chamber for screening and re-crushing. The roller cutter groove is used to allow the rotating roller cutter to pass through, and the crushing knife in the crushing chamber cooperates with the roller cutter to crush the material in the crushing chamber.

[0020] Preferably, a three-way pipe is connected between two adjacent accommodating chambers, and the three-way pipe is connected to the exhaust duct.

[0021] By adopting the above technical solution, the material falling into the containing chamber enters the exhaust duct through the three-way pipe, and then passes through the roller cutter chamber and the hook cutter chamber in sequence through the air supply duct to reach the crushing chamber for crushing.

[0022] The beneficial effects of the above technical solution of the present invention are as follows: 1. Under the action of wind, the present invention can not only make the materials falling into the accommodating chamber enter the crushing chamber and be crushed by the crushing knife, but also make the materials move along the axial direction of the rotating shaft at the roller cutter position, reduce the accumulation of materials near the hook cutter position, make multiple roller cutters participate in the crushing of materials together, and improve the efficiency of material crushing.

[0023] 2. The wind in the crushing chamber of the present invention can also cool the crushing knife and the roller cutter, reducing the material adhering to the crushing knife and the roller cutter.

[0024] 3. The first sieve hole and the second sieve hole of the present invention can screen out materials with sizes that meet the requirements. If they do not meet the requirements, they can be crushed again by the crushing knife in the crushing chamber until they can pass through the first sieve hole and fall into the discharge port and be discharged.

[0025] 4. The two hook knives of the present invention are arranged in parallel along the axial direction of the rotating shaft and cooperate with the stopper to break the material into multiple small segments, thereby improving the crushing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A three-dimensional diagram of a device for crushing injection molding scraps of the present invention; Figure 2 It is a structural schematic diagram of the rotary knife assembly of the present invention; Figure 3 is a cross-sectional view of the rotating shaft of the present invention; Figure 4 is a cross-sectional view of the internal passage of the present invention; Figure 5 for Figure 4 The enlarged view of point A in the middle; Figure 6 It is a schematic diagram of the structure in the box of the present invention; Figure 7 for Figure 6 Enlarged view of point B in the middle.

[0027] In the figure: 1. frame; 11. box body; 12. hopper; 13. discharge port; 2. rotating knife assembly; 21. rotating shaft; 22. driving unit; 23. hob; 24. hook knife; 25. hook knife cylinder; 26. opening; 3. material conveying mechanism; 31. internal channel; 311. hob cavity; 312. hook knife cavity; 313. crushing cavity; 314. accommodating cavity; 3141. block; 315. air outlet; 316. first sieve hole; 317. second sieve hole; 318. baffle; 3181. air outlet; 3182. discharge port; 319. crushing knife; 32. external pipeline; 321. fan; 322. exhaust duct; 323. air supply duct; 324. three-way pipe; 4. knife groove; 41. hob groove; 42. unloading knife groove. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the embodiments of the present invention. Figure 1-Figure 7, the technical scheme of the embodiment of the present invention is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0029] Example This embodiment provides a pulverizing device for injection molding scraps, including a frame 1 (such as Figure 1 As shown), the rotating knife assembly 2 (as Figure 2 As shown), the knife groove 4 (as Figure 6 as shown) and material conveying mechanism 3 (as shown Figure 4 The rotating knife assembly 2 and the knife groove 4 cooperate to crush the material, and the material conveying mechanism 3 conveys the material so that the material is crushed multiple times to meet the size requirements.

[0030] like Figure 1 As shown, a box 11 is provided on the frame 1 to provide a working space for the rotating knife assembly 2. A hopper 12 is provided above the box 11, and the material is transported to the box 11 through the hopper 12 for crushing. A discharge port 13 is provided below the box 11 for discharging the crushed material.

[0031] like Figure 2 As shown, the rotating knife assembly 2 includes a rotating shaft 21, a driving unit 22, a roller knife 23 and a hook knife 24.

[0032] like Figure 2 As shown, the rotating shaft 21 is installed in the middle part of the box body 11, and both ends of the rotating shaft 21 are rotatably connected to the left and right sides of the box body 11. The axial direction of the rotating shaft 21 extends in the left-right direction, and the right side of the rotating shaft 21 extends out of the right side of the box body 11 so as to be connected with the driving shaft of the driving unit 22, so that the driving unit 22 drives the rotating shaft 21 to rotate. The driving unit 22 is a driving motor, which is fixedly installed on the frame 1 and provides power for the rotation of the rotating shaft 21.

[0033] like Figure 2 As shown, the roller cutter 23 is fixedly mounted on the outer wall of the rotating shaft 21. A plurality of roller cutters 23 are evenly distributed on the rotating shaft 21 along the axial direction of the rotating shaft 21. A plurality of roller cutters 23 parallel to the axial direction of the rotating shaft 21 is a roller cutter assembly. In this embodiment, a plurality of roller cutter assemblies are arranged evenly around the axial direction of the rotating shaft 21 to form roller cutter parts, which is convenient for crushing materials at the same time. A gap is left between two adjacent roller cutter parts to facilitate the installation of the hook cutter 24.

[0034] like Figure 2As shown, a hook knife cylinder 25 is fixedly mounted between two adjacent hob parts on the rotating shaft 21. The hook knife cylinder 25 is annular. Two hook knives 24 are arranged in parallel on the hook knife cylinder 25 along the axial direction of the rotating shaft 21. The two hook knives 24 form a hook knife group. At least two hook knife groups are evenly distributed in the circumference of the hook knife cylinder 25. In this embodiment, three hook knife groups are arranged. The three hook knife groups can alternately crush the material. The two hook knives 24 of the hook knife group simultaneously crush the material into multiple small segments, thereby improving the crushing efficiency.

[0035] like Figure 1 and Figure 4 As shown, the material conveying mechanism 3 includes an internal channel 31 and an external pipe 32 . The internal channel 31 is located in the box body 11 so that the material is conveyed in the box body 11 . The external pipe 32 is located outside the box body 11 and provides a power source for the internal channel 31 .

[0036] like Figure 4 As shown, the internal channel 31 includes a roller cutter chamber 311 , a hook cutter chamber 312 , a crushing chamber 313 and a receiving chamber 314 .

[0037] like Figure 4 As shown, the hob cutter cavity 311 is opened inside the rotating shaft 21 , and the axis of the hob cutter cavity 311 is colinear with the axis of the rotating shaft 21 .

[0038] like Figure 3 and Figure 5 As shown, the left side of the hook knife cylinder 25 has a side wall, which is fixedly connected to the rotating shaft 21, and the right end of the hook knife cylinder 25 has an opening 26, which is not connected to the rotating shaft 21, and the space between the hook knife cylinder 25 and the rotating shaft 21 forms a hook knife cavity 312. An air outlet 315 is provided at a position on the hook knife cylinder 25 on the rotating shaft 21, so that the rolling knife cavity 311 and the hook knife cavity 312 are connected, and the material and wind in the rolling knife cavity 311 reach the hook knife cavity 312 through the air outlet 315.

[0039] like Figure 5 and Figure 6 As shown, the crushing chamber 313 is arranged in the housing 11 and below the rotating shaft 21. The crushing chamber 313 is arc-shaped. The front and rear sides of the crushing chamber 313 correspond to and are fixedly connected to the front and rear sides of the housing 11. The position of the crushing chamber 313 corresponds to the position of the roller chamber 311. The roller chamber 311 is located in the crushing chamber 313. A plurality of first sieve holes 316 are provided at the lower part of the crushing chamber 313 for screening the material in the crushing chamber 313.

[0040] like Figure 5 and Figure 6As shown, the side of the accommodating chamber 314 and the crushing chamber 313 that is close to the rotation direction of the rotating shaft 21 is the crushing side. In this embodiment, the front ends of the accommodating chamber 314 and the crushing chamber 313 are the crushing side. A crushing knife 319 is provided on the side of the crushing chamber 313 that is away from the crushing side, that is, the rear end of the crushing chamber 313. The crushing knife 319 is arc-shaped and fits the crushing chamber 313. Since the crushing chamber 313 is located below the rotating shaft 21, the centrifugal force of the rotating shaft 21 drives the material in the crushing chamber 313 to rotate, and the material contacts the crushing knife 319 and the roller 23 in the crushing chamber 313, and the crushing knife 319 and the roller 23 crush the material.

[0041] like Figure 5 and Figure 6 As shown, the accommodating chamber 314 is also arranged in the box body 11 and is located below the rotating shaft 21. The accommodating chamber 314 is also arc-shaped. The front and rear sides of the accommodating chamber 314 correspond to the front and rear sides of the box body 11 and are fixedly connected. The position of the accommodating chamber 314 corresponds to the position of the hook knife chamber 312. The hook knife chamber 312 is located in the accommodating chamber 314. The accommodating chamber 314 and the crushing chamber 313 are arranged at intervals along the axial direction of the rotating shaft 21.

[0042] like Figure 4 and Figure 5 As shown, the depth of the accommodating chamber 314 in the vertical direction is greater than the length of the hook knife 24, so that the hook knife 24 can rotate in the accommodating chamber 314. A stopper 3141 is provided in the accommodating chamber 314 on the crushing side, dividing the accommodating chamber 314 into two parts to accommodate two hook knives 24 arranged in parallel. The two hook knives 24 cooperate with the stopper 3141 to crush the material into multiple small segments. A part of the small segments of the crushed material will enter the accommodating chamber 314 through the gap between the hook knife 24 and the inner wall of the accommodating chamber 314.

[0043] like Figure 1 and Figure 6 As shown, a plurality of second sieve holes 317 are provided at the lower part of the accommodating chamber 314 for screening the material in the accommodating chamber 314. The discharge port 13 is located below the accommodating chamber 314 and the crushing chamber 313, and the material falling from the first sieve holes 316 and the second sieve holes 317 passes through the discharge port 13 and is discharged.

[0044] like Figure 5 and Figure 7As shown, a baffle 318 is fixedly installed between the accommodating chamber 314 and the crushing chamber 313. The baffle 318 is arc-shaped, and the center of the baffle 318 coincides with the axis of the rotating shaft 21. The rotating shaft 21 is installed in the middle part of the baffle 318. The baffle 318 and the hook knife cylinder 25 are rotatably connected. The baffle 318 blocks the opening 26 of the hook knife cylinder 25. At the same time, a discharge port 3182 is provided at the lower end of the baffle 318. The discharge port 3182 is connected to the hook knife chamber 312, so that the hook knife chamber 312 is connected to the crushing chamber 313, and the material in the hook knife chamber 312 can enter the crushing chamber 313 through the discharge port 3182 and be crushed. An air outlet 3181 is provided on the baffle 318 near the outer wall of the rotating shaft 21. The wind in the hook knife chamber 312 blows the material located at the roller portion of the rotating shaft 21 through the air outlet 3181, causing this part of the material to move along the axial direction of the rotating shaft 21, thereby reducing the accumulation of material near the hook knife 24, which is beneficial for multiple rollers 23 to crush the material at the same time and improve the crushing efficiency.

[0045] like Figure 1 As shown, the external pipeline 32 includes a fan 321 , an exhaust pipeline 322 and an air supply pipeline 323 .

[0046] like Figure 2 and Figure 4 As shown, a three-way pipe 324 is connected between two adjacent accommodating chambers 314, one end of the exhaust pipe 322 is connected to the three-way pipe 324, and the other end is connected to the air inlet of the fan 321. One end of the air supply pipe 323 is connected to the exhaust port of the fan 321, and the other end is rotatably connected to the end of the hob chamber 311.

[0047] like Figure 2 and Figure 6 As shown, in the process of the hook knife 24 hooking and crushing the material, the material falling into the accommodating chamber 314 enters the exhaust duct 322 under the suction action of the fan 321, and after reaching the fan 321, it enters the air supply duct 323 through the blowing action of the fan 321, passes through the roller chamber 311 and the hook knife chamber 312 in turn, and reaches the crushing chamber 313 from the discharge port 3182. The crushing knife 319 in the crushing chamber 313 cooperates with the roller 23 to crush the material.

[0048] like Figure 6 As shown, the cutter groove 4 includes a rolling cutter groove 41 and a blanking cutter groove 42 .

[0049] like Figure 2 and Figure 6 As shown, a roller cutter groove 41 is left between the two crushing knives 319 in the crushing chamber 313, and a feed cutter groove 42 is arranged in the crushing chamber 313 on the crushing side, that is, the roller cutter groove 41 and the feed cutter groove 42 are arranged opposite to each other, and both the roller cutter groove 41 and the feed cutter groove 42 can allow the roller cutter 23 to pass through.

[0050] like Figure 2 and Figure 6 As shown, after the material is crushed by the hook knife 24, it reaches the roller cutter part on the rotating shaft 21, and the roller cutter 23 and the feed knife groove 42 cooperate to crush the material. The crushed material enters the crushing chamber 313 through the feed knife groove 42, and the rotating shaft 21 drives the material to rotate, and the rotating material contacts the crushing knife 319, and the crushing knife 319 crushes the material, and the roller cutter 23 in the crushing chamber 313 can also contact the material to crush the material.

[0051] The method of using this embodiment: like Figure 2 As shown, the driving unit 22 drives the rotating shaft 21 to rotate, the rotating shaft 21 drives the roller 23 and the hook knife cylinder 25 to rotate, the hook knife cylinder 25 drives the hook knife 24 to rotate, and the fan 321 is started, as shown in FIG. Figure 1 As shown, the material is put into the box 11 through the hopper 12. Figure 5 and Figure 6 As shown, the hook knife 24 cooperates with the stopper 3141 and the side wall of the accommodating chamber 314 to first break the larger material into multiple small segments, and the roller 23 cooperates with the discharge knife groove 42 to crush the material.

[0052] like Figure 2 and Figure 4 As shown, the air in the air delivery duct 323 passes through the roller cutter chamber 311 and the hook cutter chamber 312 in sequence. Figure 7 As shown, the air is discharged from the air outlet 3181 on the baffle 318, moves along the axial direction of the rotating shaft 21, and blows the material located at the roller cutter position on the rotating shaft 21 to move along the axis, reducing the accumulation of the material near the hook cutter 24, which is beneficial for multiple roller cutters 23 to crush the material at the same time and improve the crushing efficiency.

[0053] like Figure 4-Figure 6 As shown, the material crushed by the roller cutter 23 enters the crushing chamber 313 through the discharge knife groove 42. Since the crushing chamber 313 is located below the rotating shaft 21, the centrifugal force of the rotating shaft 21 drives the material in the crushing chamber 313 to rotate, and the material contacts the crushing knife 319 and the roller cutter 23 in the crushing chamber 313. The crushing knife 319 and the roller cutter 23 crush the material, and the crushed material will pass through the first sieve hole 316 and fall into the discharge port 13 and be discharged. After two crushings and screening through the first sieve hole 316, the particle size of the crushed material is uniform.

[0054] like Figure 4-Figure 6As shown, part of the material crushed by the hook knife 24 enters the accommodating chamber 314 through the gap between the hook knife 24 and the accommodating chamber 314, and the smaller material that meets the size requirements will fall into the discharge port 13 through the second sieve hole 317 and be discharged, and the material that does not meet the size requirements enters the exhaust duct 322 under the suction action of the fan 321, and after reaching the fan 321, it enters the air delivery duct 323 through the blowing action of the fan 321, and then passes through the roller chamber 311 and the hook knife chamber 312 in sequence, and reaches the crushing chamber 313 from the discharge port 3182 of the baffle 318, and the crushing knife 319 and the roller 23 crush the material, and the crushed material will fall into the discharge port 13 through the first sieve hole 316 and be discharged, reducing the material gathered in the accommodating chamber 314. The wind entering the crushing chamber 313 can also cool the roller 23 and the crushing knife 319, reducing the material adhering to the roller 23 and the crushing knife 319.

[0055] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A pulverizing device for injection molding scraps, comprising a rotating knife assembly arranged in a box body and knife grooves fixedly arranged on both sides of the box body, wherein the rotating knife assembly comprises a rotating shaft rotatably connected to the box body, a driving unit driving the rotating shaft to rotate, a roller and a hook knife arranged at intervals along the axial direction of the rotating shaft, characterized in that: A material conveying mechanism is provided in the box body, the material conveying mechanism includes an internal channel and an external pipeline, the internal channel includes a roller cutter chamber arranged in the rotating shaft and having an axis colinear with the axis of the rotating shaft, a hook cutter chamber arranged on the rotating shaft and communicating with the roller cutter chamber, a crushing chamber and a containing chamber arranged on the box body and located below the rotating shaft and corresponding to the roller cutter chamber and the hook cutter chamber respectively; the crushing chamber is communicated with the hook cutter chamber, an arc-shaped baffle is fixedly installed between the crushing chamber and the containing chamber, an air outlet is provided at a portion of the baffle near the outer wall of the rotating shaft, the rotating shaft is installed in the baffle, and the baffle blocks a part of the wind in the hook cutter chamber, a crushing knife for crushing the material in the crushing chamber is provided in the crushing chamber, and a discharge port is provided below the crushing chamber; The external pipeline includes a fan, an air exhaust pipeline connecting the air inlet of the fan and the accommodating chamber, and an air supply pipeline connecting the air outlet of the fan and the hob chamber.

2. The pulverizing device for injection molding scraps according to claim 1 is characterized in that: A plurality of annular hook knife cylinders are fixedly mounted on the rotating shaft, a hook knife cavity is formed between the hook knife cylinder and the rotating shaft, an air outlet is provided at a position of the hook knife cylinder on the rotating shaft to connect the hook knife cavity with the rolling knife cavity, one end of the hook knife cylinder is fixedly connected to the outer wall of the rotating shaft, and the other end is provided with an opening to connect the hook knife cavity with the crushing cavity, the hook knife is fixedly mounted on the outer wall of the hook knife cylinder, and the rolling knife is fixedly mounted on the outer wall of the rotating shaft between the two hook knife cylinders.

3. The pulverizing device for injection molding scraps according to claim 2 is characterized in that: The baffle is installed at the opening of the hook knife cylinder and is rotatably connected to the inner wall of the hook knife cylinder. A discharge port is provided at the lower end of the baffle to communicate the hook knife chamber with the crushing chamber.

4. The pulverizing device for injection molding scraps according to claim 2, characterized in that: At least two hook cutters are arranged, evenly distributed around the hook cutter cylinder; multiple roller cutters are evenly distributed along the axial direction of the rotating shaft, multiple roller cutters parallel to the axial direction of the rotating shaft form a roller cutter group, and multiple roller cutter groups are evenly distributed around the circumference of the rotating shaft.

5. The pulverizing device for injection molding scraps according to claim 1, characterized in that: A first sieve hole is provided at the lower part of the crushing chamber, and a second sieve hole is provided at the lower part of the accommodating chamber. Both the first sieve hole and the second sieve hole are connected to the discharge port, and the materials in the crushing chamber and the accommodating chamber fall into the discharge port through the first sieve hole and the second sieve hole respectively.

6. The pulverizing device for injection molding scraps according to claim 4, characterized in that: Two hook knives are arranged in parallel on the hook knife cylinder along the axial direction of the rotating shaft. The two hook knives form a hook knife group. At least two hook knife groups are evenly distributed on the circumference of the hook knife cylinder. The side of the accommodating chamber and the crushing chamber that is close to the rotation direction of the rotating shaft is the crushing side. A block is provided on the crushing side in the accommodating chamber, dividing the accommodating chamber into two parts to accommodate the two hook knives.

7. The pulverizing device for injection molding scraps according to claim 6, characterized in that: The crushing knives are arc-shaped and are arranged at intervals along the axial direction of the rotating shaft on one side of the crushing chamber away from the crushing side. The knife grooves include a roller groove between two crushing knives for allowing the roller to pass through, and a feeding knife groove arranged in the crushing chamber on the crushing side.

8. The pulverizing device for injection molding scraps according to claim 7, characterized in that: A three-way pipe is connected between two adjacent accommodating chambers, and the three-way pipe is connected to the exhaust duct.

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