Plastic crushing device for BOPP film production

Abstract

The invention relates to the technical field of plastic recovery treatment, in particular to a plastic crushing device for BOPP film production, which comprises a bracket, a shell and two crushing rollers. The shell is installed on the support, and the two smashing rollers are arranged in the shell side by side. A plurality of air holes are uniformly distributed in the crushing roller, the crushing roller comprises a plurality of crushing sections and a plurality of cutting sections, crushing cutters are arranged on the crushing sections, and a plurality of cutters are arranged in the cutting sections. According to the plastic smashing device for BOPP film production, by arranging the smashing roller, when a film is wound around the smashing roller, after a cutter stretches out to cut the film, the film which is small in size and not enough to be adsorbed by air pressure can fall off, and the film which is large in size and still can be adsorbed by the air pressure continues to synchronously rotate along with the smashing roller; and secondary cutting and smashing are waited, the smashing effect on the thin film is improved, and normal smashing is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of plastic recycling and processing, and in particular to a plastic crushing device for BOPP film production. Background Art

[0002] In the field of modern packaging materials, BOPP film is widely used in many industries due to its excellent optical properties, barrier properties, mechanical properties and printing adaptability.

[0003] BOPP film production originates from the melt processing of high molecular weight polypropylene. First, the melt is formed into a sheet or thick film through an extruder, and then stretched in two perpendicular directions, longitudinally and transversely, in a specific stretching machine under precisely controlled temperature and speed conditions, and combined with appropriate cooling, heat treatment or special processing techniques such as corona, coating, etc., to finally form a film product that meets the requirements. BOPP film is a thermoplastic plastic that can be reshaped after heating, so it has the characteristics of being recyclable and reusable. The waste generated during the production process can be crushed by a crushing device to give it a more suitable shape to facilitate subsequent processing operations, such as better plasticization and melting in the extruder.

[0004] However, due to the soft texture and strong tensile properties of BOPP film, it is very easy for the film to be entangled on the pulverizing shaft during the pulverizing process. Once entanglement occurs, the rotation resistance of the pulverizing shaft will increase sharply, and its rotation speed will slow down. In severe cases, it may even cause the pulverizing shaft to get stuck, causing the entire pulverizing device to stop running. This situation not only interrupts the production process and reduces production efficiency, but may also damage the mechanical structure of the pulverizing equipment, increasing the maintenance cost and downtime of the equipment. Summary of the invention

[0005] The invention provides a plastic crushing device for BOPP film production, so as to solve the problem that in the crushing process of the existing crushing device, the plastic film is very easy to be wound around the crushing shaft, thus affecting the normal progress of the crushing process.

[0006] A plastic crushing device for BOPP film production of the present invention adopts the following technical scheme: a plastic crushing device for BOPP film production, comprising a bracket, a shell and two crushing rollers; the shell is installed on the bracket, and a feed port and a discharge port arranged in sequence in a first direction are provided on the shell, the first direction is a vertical direction, and the feed port is located above the discharge port; the two crushing rollers are arranged side by side in the shell along a second direction, the crushing rollers are arranged along a third direction and can rotate around their own axes, the second direction and the third direction are both horizontal directions and perpendicular to each other; an air guide tube is coaxially arranged in each crushing roller, and the air guide tube is fixedly connected to the bracket; a plurality of air holes are evenly distributed on the crushing roller around the third direction, and an air duct is provided on the air guide tube around the third direction, and the air duct is connected to the crushing roller through the air holes The airway is connected to the outside world; the airway is divided into an upper airway and a lower airway in a first direction, the upper airway is located above the lower airway, the upper airway and the lower airway are not connected to each other, the upper airway can provide positive pressure to the air holes connected to it, and the lower airway can provide negative pressure to the air holes connected to it; the crushing roller includes a plurality of crushing sections and a plurality of cutting sections arranged in sequence along the third direction, and the crushing sections and the cutting sections are alternately distributed in the third direction; the two crushing rollers are staggered in the third direction, the crushing section of one crushing roller is arranged corresponding to the cutting section of the other crushing roller and meshing with each other; the crushing section is provided with a crushing knife, and a plurality of cutting knives are arranged in the cutting section; the plurality of cutting knives can rotate with the cutting section and can be extended and retracted in a fourth direction, and the fourth direction is the radial direction of the cutting section.

[0007] Further, whenever any cutter is arranged vertically downward, the distance that the cutter extends out of the cutting section in the fourth direction is greater than the distance that other cutters extend out of the cutting section in the fourth direction.

[0008] Furthermore, a plurality of connecting components are fixedly arranged on the air guide tube, and the plurality of connecting components are sequentially arranged on the air guide tube along the third direction, and the plurality of connecting components are arranged in one-to-one correspondence with the plurality of cutting sections; the plurality of cutters in each cutting section are evenly distributed around the third direction on the corresponding connecting components; the connecting component includes two connecting plates, the two connecting plates have the same structure and are arranged face to face in the third direction; both connecting plates have limiting grooves, and limiting plates are arranged in the limiting grooves, and the plurality of cutters are installed in the limiting grooves and can slide around the third direction along the limiting plates; the limiting plates include a first limiting section and a second limiting section; the first limiting section and the second limiting section are sequentially arranged around the third direction and connected to each other; the first limiting section and the second limiting section are both arc sections, the first limiting section is an inferior arc, and the second limiting section is a superior arc; the first limiting section is located below the second limiting section, and when the cutter slides along the first limiting section, the distance that the cutter extends out of the cutting section in the fourth direction is greater than the distance that the cutter extends out of the cutting section in the fourth direction when the cutter slides along the second limiting section.

[0009] Furthermore, a magnet is arranged at one end of each cutter that contacts the limiting plate, and a magnetic strip is wound around the outer peripheral wall surface of the limiting plate, and the magnetic strip can be attracted to the magnet.

[0010] Furthermore, four cutters are arranged in each cutting section, and the four cutters are evenly distributed around the third direction in the corresponding cutting section.

[0011] Further, the multiple air holes are divided into two groups, one group of air holes is opened on the crushing section, and each crushing section has multiple air holes, and the other group of air holes is opened on the cutting section, and each cutting section has multiple air holes; multiple air passages are provided, and the multiple air passages are sequentially arranged along the third direction on the air guide tube, and the multiple air passages are divided into two groups, one group of air passages is arranged in one-to-one correspondence with the multiple crushing sections, and the other group of air passages is arranged in one-to-one correspondence with the multiple cutting sections.

[0012] Furthermore, a plurality of partitions are arranged on the end surface of the connecting plate, and the plurality of partitions are evenly distributed on the connecting plate around a third direction, and a flow limiting channel is defined between every two adjacent partitions arranged around the third direction; the air hole opened on the cutting section is called a first air hole, and the plurality of flow limiting channels are arranged one-to-one correspondingly to the plurality of first air holes and are interconnected.

[0013] Furthermore, the connecting assembly also includes a connecting pipe, the connecting pipe and the two connecting plates are arranged in sequence in the third direction, the connecting pipe is fixedly connected to the two connecting plates, and a plurality of through holes are opened on the connecting pipe around the third direction; the air holes opened on the crushing section are called second air holes, and the plurality of through holes are arranged one-to-one with the plurality of second air holes and are interconnected.

[0014] Furthermore, each cutting section is provided with a plurality of telescopic slots, and a plurality of cutters are arranged in one-to-one correspondence with the plurality of telescopic slots. Each cutter is installed in the corresponding telescopic slot and can move in the corresponding telescopic slot.

[0015] Furthermore, an air pump is provided on the bracket, and the air pump has two joints, one of which is a negative pressure suction port, and the other is a positive pressure inflation port. The positive pressure inflation port is connected to a first air pipe through a first adapter, and the first air pipe is connected to the upper airway. The negative pressure suction port is connected to a second air pipe through a second adapter, and the second air pipe is connected to the lower airway.

[0016] The beneficial effects of the present invention are as follows: a plastic crushing device for BOPP film production of the present invention is provided with a crushing roller. During the crushing process, when a film is wound around the crushing roller, a plurality of cutters rotating with the cutting section will cut the wound film along the fourth direction. Since the air guide tube is stationary, as the crushing roller rotates, the upper airway will always provide positive pressure for the crushing roller rotating thereto. This setting can provide an upward force to the film through the airflow to assist the film to separate from the crushing roller. The lower airway will always provide negative pressure for the crushing roller rotating thereto. This setting can provide attraction to the film through the airflow, so that after the cutter extends out to cut the film, the film with a smaller volume that is not enough to be adsorbed by the air pressure can fall off, while the film with a larger volume that can still be adsorbed by the air pressure will continue to rotate synchronously with the crushing roller, and will be driven by the crushing roller to rotate to the upper side again, waiting for secondary cutting and crushing, thereby improving the crushing effect on the film, and the continuously flowing airflow will improve the circulation of air in the shell, assist the crushing roller in heat dissipation, prevent the film to be crushed from melting at high temperature and sticking to the crushing roller, and ensure normal crushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a plastic crushing device for BOPP film production of the present invention; Figure 2 It is a front view of the overall structure of an embodiment of a plastic crushing device for BOPP film production of the present invention; Figure 3 for Figure 2 Sectional view along AA; Figure 4 for Figure 3 Cross-sectional view along the middle line BB; Figure 5 for Figure 4 The enlarged view of the X in the middle; Figure 6 This is a disassembled diagram of part of the mechanism of an embodiment of a plastic crushing device for BOPP film production of the present invention; Figure 7 A schematic diagram of an air guide tube of an embodiment of a plastic crushing device for BOPP film production according to the present invention; Figure 8A schematic diagram of a connecting assembly and a cutter of an embodiment of a plastic pulverizing device for BOPP film production according to the present invention; Fig. 9 An exploded view of a connecting assembly and a cutter of an embodiment of a plastic pulverizing device for BOPP film production of the present invention; Fig.10 A front view of a connecting assembly and a cutter of an embodiment of a plastic crushing device for BOPP film production of the present invention; Fig.11 for Fig.10 Cross-sectional view at the middle edge CC; Fig.12 A side view of a connecting plate of an embodiment of a plastic pulverizing device for producing BOPP film according to the present invention; Fig.13 for Fig.12 Cross-sectional view along DD.

[0019] In the figure: 100, bracket; 110, motor; 120, air pump; 200, housing; 210, feed port; 220, discharge port; 230, gear; 300, crushing roller; 301, air hole; 310, crushing section; 320, cutting section; 321, telescopic slot; 330, cutter; 400, air guide tube; 401, air guide plate; 410, air duct; 500, connecting assembly; 510, connecting plate; 511, plate body; 512, connecting ring; 513, partition; 520, limiting slot; 530, limiting plate; 531, first limiting section; 532, second limiting section; 540, connecting pipe; 541, through hole. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] An embodiment of a plastic crushing device for BOPP film production of the present invention is as follows: Figures 1 to 13 shown.

[0022] A plastic crushing device for BOPP film production includes a support 100, a shell 200 and two crushing rollers 300. The shell 200 is installed on the support 100, and a feed port 210 and a discharge port 220 are arranged in sequence in a first direction on the shell 200. The first direction is a vertical direction, and the feed port 210 is located above the discharge port 220. The two crushing rollers 300 are arranged in parallel along a second direction in the shell 200, and the crushing rollers 300 are arranged along a third direction and can rotate around their own axes. The second direction and the third direction are both horizontal directions and perpendicular to each other. An air duct 400 is coaxially arranged in each crushing roller 300, and the air duct 400 is fixedly connected to the support 100. A plurality of air holes 301 are evenly distributed on the crushing roller 300 around the third direction, and an air duct 410 is opened on the air duct 400 around the third direction, and the air duct 410 is connected to the outside through the air holes 301. In the first direction, the airway 410 on the airway tube 400 is divided into an upper airway and a lower airway, the upper airway is located above the lower airway, the upper airway and the lower airway are not connected to each other, the upper airway can provide positive pressure to the air hole 301 connected thereto, and the lower airway can provide negative pressure to the air hole 301 connected thereto.

[0023] The crushing roller 300 includes a plurality of crushing sections 310 and a plurality of cutting sections 320 sequentially arranged along the third direction, and the crushing sections 310 and the cutting sections 320 are alternately distributed in the third direction. The two crushing rollers 300 are staggered in the third direction, and the crushing section 310 of one crushing roller 300 is arranged correspondingly and meshed with the cutting section 320 of the other crushing roller 300. The crushing section 310 is provided with a crushing knife, and the cutting section 320 is provided with a plurality of cutting knives 330. The plurality of cutting knives 330 can rotate with the cutting section 320 and can be extended and retracted in a fourth direction, and the fourth direction is the radial direction of the cutting section 320.

[0024] Specifically, a motor 110 is provided on the bracket 100, and two gears 230 are provided on the outer shell 200. The two gears 230 are arranged in a one-to-one correspondence with the two crushing rollers 300. Each gear 230 is coaxial with the corresponding crushing roller 300, and the crushing roller 300 extends out of the outer shell 200 along the third direction and is fixedly connected to the corresponding gear 230. The output end of the motor 110 is fixedly connected to one of the gears 230.

[0025] When in use, the motor 110 starts to drive the gear 230 fixed thereto to rotate, and the rotation of the gear 230 drives another gear 230 meshing therewith to rotate, thereby enabling the two crushing rollers 300 to rotate around their own axes respectively. Figure 4 As shown, the pulverizing roller 300 on the left side rotates clockwise, and the pulverizing roller 300 on the right side rotates counterclockwise.

[0026] In this embodiment, by providing the crushing rollers 300, when in use, the BOPP film is fed into the housing 200 from one side of the feed port 210, and the BOPP film is hereinafter referred to as the film. When the film passes through the two crushing rollers 300, the film will be crushed by the crushing blades on the crushing section 310, and the crushed film will be discharged from the discharge port 220.

[0027] During the shredding process, when a film is wound around the shredding roller 300, the multiple cutters 330 rotating with the cutting section 320 will cut the wound film along the fourth direction. Since the air duct 400 is stationary, as the shredding roller 300 rotates, the upper airway will always provide positive pressure for the shredding roller 300 that rotates to this position. This setting can apply an upward force to the film through the airflow, thereby helping the film to separate from the shredding roller 300. And the lower air duct will always provide negative pressure for the crushing roller 300 that rotates to this position. This setting can provide attraction to the film through airflow, so that after the cutter 330 extends to cut the film, the film that is too small to be adsorbed by the air pressure can fall off, while the film that is larger and can still be adsorbed by the air pressure will continue to rotate synchronously with the crushing roller 300, and be driven by the crushing roller 300 to rotate upward again, waiting for the second cutting and crushing, thereby improving the crushing effect on the film, and the continuously flowing airflow will improve the circulation of air in the outer shell 200, assist the crushing roller 300 in dissipating heat, prevent the film to be crushed from melting at high temperature and sticking to the crushing roller 300, and ensure normal crushing.

[0028] In this embodiment, whenever any cutter 330 is arranged vertically downward, the distance that the cutter 330 extends out of the cutting section 320 in the fourth direction is greater than the distance that other cutters 330 extend out of the cutting section 320 in the fourth direction.

[0029] When the cutting section 320 drives the cutter 330 to rotate, since the film and the cutter 330 on the cutting section 320 are in a relatively static state, when any cutter 330 is set vertically downward, the distance extended from the cutting section 320 is the maximum, so that when the film and the cutter 330 rotate to this position, the cutter 330 can cut the most film, so that any film that can fall at this time can be directly dropped and discharged.

[0030] In this embodiment, a plurality of connection components 500 are fixedly arranged on the air duct 400, and the plurality of connection components 500 are sequentially arranged on the air duct 400 along the third direction, and the plurality of connection components 500 are arranged one by one in correspondence with the plurality of cutting sections 320. The plurality of cutters 330 in each cutting section 320 are evenly distributed on the corresponding connection components 500 around the third direction. The connection component 500 includes two connection plates 510, and the two connection plates 510 are sequentially arranged and fixedly connected in the third direction. The two connection plates 510 have the same structure and are arranged face to face in the third direction. Both connection plates 510 have a limiting groove 520, and a limiting plate 530 is arranged in the limiting groove 520. The plurality of cutters 330 are installed in the limiting groove 520 and can slide along the limiting plate 530 around the third direction. The limiting plate 530 includes a first limiting section 531 and a second limiting section 532. The first limiting section 531 and the second limiting section 532 are sequentially arranged around the third direction and connected to each other. The first limiting section 531 and the second limiting section 532 are both arc sections, the first limiting section 531 is a minor arc, and the second limiting section 532 is a major arc. The first limiting section 531 is located below the second limiting section 532, and when the cutter 330 slides along the first limiting section 531, the distance that the cutter 330 extends from the cutting section 320 in the fourth direction is greater than the distance that the cutter 330 extends from the cutting section 320 in the fourth direction when the cutter 330 slides along the second limiting section 532.

[0031] Specifically, the second limiting section 532 is an arc-shaped structure with a convex middle and concave ends. The distance from the first limiting section 531 in the fourth direction to the central axis of the connecting plate 510 in the third direction is greater than the distance from the second limiting section 532 in the fourth direction to the central axis of the connecting plate 510 in the third direction, so that when the cutter 330 slides along the first limiting section 531, the distance that the cutter 330 extends from the cutting section 320 in the fourth direction is greater than the distance that the cutter 330 extends from the cutting section 320 in the fourth direction when the cutter 330 slides along the second limiting section 532.

[0032] The connecting plate 510 includes a plate body 511 and a connecting ring 512, which are arranged in sequence in the third direction, and the limiting plate 530 is located between the plate body 511 and the connecting ring 512. The limiting groove 520 is defined by the plate body 511, the connecting ring 512 and the limiting plate 530. The cutter 330 has two knife arms, which are arranged one by one corresponding to the limiting grooves 520 of the two connecting plates 510, and each knife arm is installed in the corresponding limiting groove 520.

[0033] In this embodiment, a magnet is provided at one end of each cutter 330 that contacts the limiting plate 530, and a magnetic strip is wound around the outer wall of the limiting plate 530. The magnetic strip can be attracted to the magnet. Then, when the cutting section 320 rotates and drives the corresponding cutter 330 to rotate, the end of the cutter 330 that contacts the limiting plate 530 can always slide along the limiting plate 530 and be limited by the limiting plate 530, thereby realizing the extension and retraction of the cutter 330 in the fourth direction.

[0034] In this embodiment, four cutters 330 are arranged in each cutting section 320, and the four cutters 330 are evenly distributed around the third direction in the corresponding cutting section 320. That is, the four cutters 330 are perpendicular to each other.

[0035] Specifically, each cutting section 320 is provided with a plurality of telescopic slots 321, and the plurality of telescopic slots 321 are through slots arranged along the fourth direction. The plurality of cutters 330 are arranged in one-to-one correspondence with the plurality of telescopic slots 321, and each cutter 330 is installed in a corresponding telescopic slot 321 and can move in the corresponding telescopic slot 321.

[0036] In this embodiment, by setting the connection assembly 500, when in use, as the crushing roller 300 rotates, the cutting section 320 on the crushing roller 300 will drive the cutter 330 thereon to rotate. Since the connection assembly 500 is fixedly arranged, when the cutter 330 slides along the limit plate 530, the extended length of the cutter 330 will change continuously with the curvature of the first limit section 531 and the second limit section 532. Fig.13 As shown, when the cutter 330 slides along the first limiting section 531 , the distance that the cutter 330 extends out of the cutting section 320 along the fourth direction is greater than the distance that the cutter 330 extends out of the cutting section 320 along the fourth direction when the cutter 330 slides along the second limiting section 532 .

[0037] Since four cutters 330 are arranged in each cutting section 320, when one cutter 330 is arranged vertically downward, the other three cutters 330 are all located on the second limiting section 532. That is, whenever any cutter 330 is arranged vertically downward, the distance that the cutter 330 extends out of the cutting section 320 in the fourth direction is greater than the distance that the other cutters 330 extend out of the cutting section 320 in the fourth direction. That is, when any cutter 330 is arranged vertically downward, the distance that the cutter 330 extends out of the cutting section 320 is the largest, so that when the film rotates to this position, the cutter 330 can cut the most film, so that at this time, if there is any film that can fall, it can fall directly and be discharged.

[0038] In this embodiment, the multiple air holes 301 are divided into two groups, one group of air holes 301 is opened on the crushing section 310, and each crushing section 310 has multiple air holes 301, and the other group of air holes 301 is opened on the cutting section 320, and each cutting section 320 has multiple air holes 301.

[0039] There are multiple air channels 410, which are arranged in sequence along the third direction on the air guide tube 400, and the multiple air channels 410 are divided into two groups, one group of air channels 410 is arranged in a one-to-one correspondence with the multiple crushing segments 310, and the other group of air channels 410 is arranged in a one-to-one correspondence with the multiple cutting segments 320.

[0040] Specifically, the air guide tube 400 has a plurality of air guide plates 401 , which are evenly distributed around the third direction in the air guide tube 400 , and the air passage 410 is defined by every two air guide plates 401 that are adjacently arranged around the third direction.

[0041] By respectively opening air holes 301 on the cutting section 320 and the crushing section 310 and connecting them with the corresponding air passages 410, it can be ensured that gas exists on each cutting section 320 and each crushing section 310, thereby achieving uniform distribution of gas.

[0042] In this embodiment, a plurality of baffles 513 are arranged on the end surface of the connecting plate 510, and the plurality of baffles 513 are evenly distributed around the third direction on the connecting plate 510, and a flow limiting passage is defined between every two adjacent baffles 513 arranged around the third direction. The air holes 301 provided on the cut-off section 320 are referred to as first air holes, and the plurality of flow limiting passages are arranged in one-to-one correspondence with the plurality of first air holes and are connected to each other, and the air channel 410 arranged corresponding to the cut-off section 320 is connected to the first air hole through the flow limiting passage.

[0043] Furthermore, the connection assembly 500 further includes a connection pipe 540, the connection pipe 540 and the two connection plates 510 are sequentially arranged in the third direction, the connection pipe 540 is fixedly connected to the two connection plates 510, and a plurality of through holes 541 are provided on the connection pipe 540 around the third direction. The air holes 301 provided on the crushing section 310 are referred to as second air holes, the plurality of through holes 541 are arranged in one-to-one correspondence with the plurality of second air holes and are connected to each other, and the air passage 410 corresponding to the crushing section 310 is connected to the second air holes through the through holes 541.

[0044] In this embodiment, a first air hole is formed on the cutting section 320, and the air channel 410 on the air guide tube 400 is connected to the first air hole through the flow limiting channel. When in use, the gas flowing out of the air channel 410 of the air guide tube 400 will first be diverted through the corresponding flow limiting channel, and then discharged from the first air hole corresponding to the flow limiting channel. Similarly, a second air hole is formed on the crushing section 310, and the air channel 410 on the air guide tube 400 is connected to the second air hole through the through hole 541. When in use, the gas flowing out of the air channel 410 of the air guide tube 400 will first be diverted through the corresponding air hole 301, and then discharged from the second air hole corresponding to the through hole 541.

[0045] In this embodiment, eight air guide plates 401 are provided, and the eight air guide plates 401 define eight air passages 410, of which four are upper air passages and four are lower air passages. Eight partition plates 513 are provided, and the eight partition plates 513 define eight flow limiting passages. Eight first air holes are provided around the third direction on each cutting section 320, and the eight first air holes are provided in a one-to-one correspondence with the eight flow limiting passages. Eight through holes 541 are provided around the third direction on the connecting pipe 540, and eight second air holes are provided on each crushing section 310, and the eight second air holes are provided in a one-to-one correspondence with the eight through holes 541.

[0046] In this embodiment, an air pump 120 is provided on the bracket 100. The air pump 120 adopts an R400-VC positive and negative pressure dual-purpose oil-free vacuum pump. The air pump 120 has two joints, one of which is a negative pressure suction port, and the other is a positive pressure inflation port. The positive pressure inflation port is connected to a first air pipe through a first adapter, and the first air pipe is connected to the upper airway. The negative pressure suction port is connected to a second air pipe through a second adapter, and the second air pipe is connected to the lower airway.

[0047] Alternatively, the bracket 100 is provided with an air extraction pump and an air inflation pump, the air inflation pump is connected to a first air pipe via a first adapter, the first air pipe is arranged corresponding to the upper airway, the air extraction pump is connected to a second air pipe via a second adapter, the second air pipe is arranged corresponding to the lower airway.

[0048] Specifically, four first air pipes and four second air pipes are provided, the four first air pipes are provided in a one-to-one correspondence with the four upper airways, and the four second air pipes are provided in a one-to-one correspondence with the four second airways 410 .

[0049] In this embodiment, an air pump 120 is provided to provide positive pressure for the upper airway and negative pressure for the lower airway.

[0050] In combination with the above embodiments, the specific working process is as follows: When in use, the motor 110 is started, and the motor 110 is used to drive the two crushing rollers 300 to rotate around their own axes respectively. Figure 4As shown, the pulverizing roller 300 on the left side rotates clockwise, and the pulverizing roller 300 on the right side rotates counterclockwise.

[0051] Then, the BOPP film is put into the housing 200 from one side of the feed port 210. The BOPP film is hereinafter referred to as the film. When the film passes through the two crushing rollers 300, the film will be crushed by the crushing blades on the crushing section 310, and the crushed film will be discharged from the discharge port 220. The air pump 120 is started synchronously to supply air to the air guide pipe 400.

[0052] During the pulverizing process, when a film is wound around the pulverizing roller 300, as the pulverizing roller 300 rotates, the cutting section 320 on the pulverizing roller 300 will drive the cutter 330 thereon to rotate. Since the connecting assembly 500 is fixedly arranged, when the cutter 330 slides along the limiting plate 530, the extended length of the cutter 330 will continuously change with the curvature of the first limiting section 531 and the second limiting section 532. See the attached Fig.13 As shown, when the cutter 330 slides along the first limiting section 531 , the distance that the cutter 330 extends out of the cutting section 320 along the fourth direction is greater than the distance that the cutter 330 extends out of the cutting section 320 along the fourth direction when the cutter 330 slides along the second limiting section 532 .

[0053] That is, the multiple cutters 330 rotating with the cutting section 320 will cut the wound film along the fourth direction, and when any cutter 330 is set vertically downward, the distance extended from the cutting section 320 is the largest, so that when the film rotates to this position, the cutter 330 can cut the most film, so that if there is any film that can fall at this time, it can fall and be discharged directly.

[0054] Since the air duct 400 is stationary, as the crushing roller 300 rotates, the upper airway will always provide positive pressure for the crushing roller 300 that rotates there. This setting can give the film an upward force through the airflow, and assist the film to detach from the crushing roller 300. The lower airway will always provide negative pressure for the crushing roller 300 that rotates there. This setting can provide attraction to the film through the airflow, so that after the cutter 330 extends to cut the film, the film with a small volume that is not enough to be adsorbed by the air pressure can fall, while the film with a large volume that can still be adsorbed by the air pressure will continue to rotate synchronously with the crushing roller 300, and will be driven by the crushing roller 300 to rotate to the top again, waiting for secondary cutting and crushing, thereby improving the crushing effect on the film, and the continuous airflow will improve the circulation of air in the housing 200, assist the crushing roller 300 in heat dissipation, prevent the film to be crushed from melting at high temperature and sticking to the crushing roller 300, and ensure normal crushing.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A plastic crushing device for BOPP film production, characterized in that: It comprises a bracket, a shell and two crushing rollers; the shell is mounted on the bracket, and a feed port and a discharge port are provided on the shell in sequence in a first direction, the first direction is a vertical direction, and the feed port is located above the discharge port; the two crushing rollers are arranged in parallel along a second direction in the shell, the crushing rollers are arranged along a third direction and can rotate around their own axes, and the second direction and the third direction are both horizontal directions and perpendicular to each other; an air guide tube is coaxially arranged in each crushing roller, and the air guide tube is fixedly connected to the bracket; a plurality of air holes are evenly distributed on the crushing roller around the third direction, and an airway is provided on the air guide tube around the third direction, and the airway is connected to the outside through the air holes; The airway is divided into an upper airway and a lower airway in a first direction, the upper airway is located above the lower airway, the upper airway and the lower airway are not connected to each other, the upper airway can provide positive pressure to the air holes connected to it, and the lower airway can provide negative pressure to the air holes connected to it; the crushing roller includes a plurality of crushing sections and a plurality of cutting sections arranged in sequence along the third direction, and the crushing sections and the cutting sections are alternately distributed in the third direction; the two crushing rollers are staggered in the third direction, the crushing section of one crushing roller is arranged correspondingly to the cutting section of the other crushing roller and meshes with each other; the crushing section is provided with a crushing knife, and the cutting section is provided with a plurality of cutting knives; The plurality of cutters can rotate with the cutting section and can be extended and retracted in a fourth direction, and the fourth direction is a radial direction of the cutting section.

2. The plastic crushing device for BOPP film production according to claim 1, characterized in that: Whenever any cutter is arranged vertically downward, the distance that the cutter extends out of the cutting section in the fourth direction is greater than the distance that the other cutters extend out of the cutting section in the fourth direction.

3. The plastic crushing device for BOPP film production according to claim 2, characterized in that: A plurality of connection components are fixedly arranged on the air guide tube, and the plurality of connection components are arranged in sequence along the third direction on the air guide tube, and the plurality of connection components are arranged in one-to-one correspondence with the plurality of cutting sections; the plurality of cutters in each cutting section are evenly distributed around the third direction on the corresponding connection components; the connection component includes two connection plates, the two connection plates have the same structure and are arranged face to face in the third direction; both connection plates have limiting grooves, and limiting plates are arranged in the limiting grooves, and the plurality of cutters are installed in the limiting grooves and can slide around the third direction along the limiting plates; the limiting plates include a first limiting section and a second limiting section; the first limiting section and the second limiting section are arranged in sequence around the third direction and are connected to each other; the first limiting section and the second limiting section are both arc sections, the first limiting section is an inferior arc, and the second limiting section is a superior arc; the first limiting section is located below the second limiting section, and when the cutter slides along the first limiting section, the distance that the cutter extends out of the cutting section in the fourth direction is greater than the distance that the cutter extends out of the cutting section in the fourth direction when the cutter slides along the second limiting section.

4. The plastic crushing device for BOPP film production according to claim 3, characterized in that: One end of each cutter in contact with the limiting plate is provided with a magnet, and a magnetic strip is wound around the outer peripheral wall surface of the limiting plate, and the magnetic strip can be attracted to the magnet.

5. The plastic crushing device for BOPP film production according to claim 4, characterized in that: Four cutters are arranged in each cutting section, and the four cutters are evenly distributed around the third direction in the corresponding cutting section.

6. The plastic crushing device for BOPP film production according to claim 3, characterized in that: The multiple air holes are divided into two groups, one group of air holes is opened on the crushing section, and each crushing section has multiple air holes, and the other group of air holes is opened on the cutting section, and each cutting section has multiple air holes; multiple air passages are provided, and the multiple air passages are sequentially arranged along the third direction on the air guide tube, and the multiple air passages are divided into two groups, one group of air passages is arranged corresponding to the multiple crushing sections one by one, and the other group of air passages is arranged corresponding to the multiple cutting sections one by one.

7. The plastic crushing device for BOPP film production according to claim 6, characterized in that: A plurality of partitions are arranged on the end surface of the connecting plate, and the plurality of partitions are evenly distributed on the connecting plate around a third direction, and a flow limiting channel is defined between every two adjacent partitions arranged around the third direction; the air hole opened on the cutting section is called a first air hole, and the plurality of flow limiting channels and the plurality of first air holes are arranged one by one and are interconnected.

8. The plastic crushing device for BOPP film production according to claim 7, characterized in that: The connecting assembly also includes a connecting pipe, which and two connecting plates are arranged in sequence in a third direction, the connecting pipe is fixedly connected to the two connecting plates, and a plurality of through holes are opened on the connecting pipe around the third direction; the air holes opened on the crushing section are called second air holes, and the plurality of through holes and the plurality of second air holes are arranged one by one and are interconnected.

9. The plastic crushing device for BOPP film production according to claim 1, characterized in that: Each cutting section is provided with a plurality of telescopic slots, and a plurality of cutters are arranged correspondingly to the plurality of telescopic slots. Each cutter is installed in the corresponding telescopic slot and can move in the corresponding telescopic slot.

10. The plastic crushing device for BOPP film production according to claim 1, characterized in that: An air pump is arranged on the bracket, and the air pump has two joints, one of which is a negative pressure suction port, and the other is a positive pressure inflation port. The positive pressure inflation port is connected to a first air pipe through a first adapter, and the first air pipe is connected to the upper airway. The negative pressure suction port is connected to a second air pipe through a second adapter, and the second air pipe is connected to the lower airway.

Images