An edge material recycling device for PE plastic production

Abstract

The present invention relates to the technical field of plastic recycling devices, and particularly relates to a waste edge recycling device for PE plastic production, which comprises a bracket, a housing, a crushing roller and a plurality of blades. The housing is arranged vertically on the bracket. An inlet is provided at the upper end of the housing, and an outlet is provided at the lower end. A connecting pipe is arranged at the outlet. The crushing roller is arranged inside the housing and can rotate around its own axis. The plurality of blades are evenly distributed in the circumferential direction of the crushing roller. When the waste edge recycling device for PE plastic production of the present invention recycles waste edges, the crushing roller is driven to rotate to crush the waste edges. The crushed waste edges will enter the connecting pipe through the outlet. Moreover, the rotation of the crushing roller will drive the blades arranged thereon to rotate, and the rotation of the blades can promote the waste edges on the crushing roller to flow towards the direction where the crushing roller meshes with the fixed teeth, reduce the accumulation of waste edges, and play an auxiliary role in the crushing of the crushing roller.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic recycling devices, and particularly relates to a trimming recycling device for PE plastic production. Background Art

[0002] PE plastic, also known as polyethylene plastic, is a thermoplastic polymerized from ethylene. It is odorless, non-toxic, and feels like wax. It has good low-temperature resistance, chemical stability, corrosion resistance, mechanical properties, and electrical properties, and is widely used in many fields.

[0003] For example, PE plastic can be used in the production of bubble wrap. During the production of bubble wrap, trimmings are inevitably generated. To save energy, in the prior art, the trimmings are usually crushed and then fed into an extrusion granulation device to be extruded into a shape for recycling. However, since the overall quality of the trimmings is relatively light, when they are crushed, the trimmings are likely to accumulate on the crushing roller, resulting in poor feeding, affecting the normal crushing process, and reducing the crushing efficiency. Summary of the Invention

[0004] The present invention provides a trimming recycling device for PE plastic production to solve the problem that in the existing recycling device, since the overall quality of the trimmings is relatively light, when they are crushed, the trimmings are likely to accumulate on the crushing roller, resulting in poor feeding, affecting the normal crushing process, and reducing the crushing efficiency.

[0005] The trimming recycling device for PE plastic production of the present invention adopts the following technical solution: A trimming recycling device for PE plastic production includes a support, a housing, a crushing roller, and a plurality of blades; the housing is arranged vertically on the support, and the direction of the housing is called the first direction; an inlet is provided at the upper end of the housing, and an outlet is provided at the lower end, and a connecting pipe is provided at the outlet; the crushing roller is arranged horizontally in the housing and can rotate around its own axis, and the second direction is the horizontal direction; fixed teeth are arranged in the housing, and the crushing roller can rotate and engage with the fixed teeth; the plurality of blades are evenly distributed in the circumferential direction of the crushing roller, and a slide rail is arranged in the housing. The blades can rotate synchronously with the crushing roller and can slide along the slide rail, and the blades never contact the fixed teeth during rotation; the slide rail includes a first sliding section, and the two ends of the first sliding section are respectively called the head end and the tail end. The head end and the tail end are arranged in sequence in the rotation direction of the crushing roller, and in the rotation direction of the crushing roller, the head end is located in front of the tail end; when any blade slides in the first sliding section, the blade and the blade in front of it both slide and seal with the inner wall surface of the housing and jointly define a cavity with the inner wall surface of the housing. During the process of the blade sliding from the head end to the tail end of the first sliding section, the volume of the cavity gradually decreases, and during the process of the cavity volume decreasing, the cavity can communicate with the outlet.

[0006] Further, there are two fixed teeth, which are arranged side by side in the housing along the third direction, and the two fixed teeth are respectively located on both sides of the crushing roller along the third direction. The third direction is a horizontal direction perpendicular to the second direction.

[0007] Further, a plurality of blades are all mounted on the crushing roller through the first elastic member.

[0008] Further, the end where the blade is mounted on the crushing roller is called the first end, and the end of the blade facing the housing is called the second end. The first end and the second end are arranged in sequence in the rotation direction of the crushing roller, and in the rotation direction of the crushing roller, the first end is located behind the second end.

[0009] Further, the slide rail further includes a second slide section, a third slide section and a fourth slide section; the first slide section, the second slide section, the third slide section and the fourth slide section are connected in sequence in the rotation direction of the crushing roller and form a closed structure; the first slide section and the third slide section are both arranged along the first direction, the second slide section and the fourth slide section are both arc-shaped, and when the blade slides in the first slide section and the second slide section, the blade slides and seals with the inner wall surface of the housing; when the blade slides in the third slide section and the fourth slide section, the blade is arranged away from the inner wall surface of the housing.

[0010] Further, the second slide section and the fourth slide section are both coaxially arranged with the crushing roller, the second slide section and the fourth slide section are respectively located on the upper and lower sides of the crushing roller, and the diameter of the second slide section is smaller than that of the fourth slide section.

[0011] Further, the slide rail further includes a first avoidance section and a second avoidance section. The first avoidance section is located between the first slide section and the second slide section, and the second avoidance section is located between the second slide section and the third slide section; the two fixed teeth are respectively called the first tooth and the second tooth. The first avoidance section and the first tooth are arranged in sequence in the radial direction of the crushing roller, and the first avoidance section is located on the side of the first tooth closer to the central axis of the crushing roller in the radial direction of the crushing roller. The second avoidance section and the second tooth are arranged in sequence in the radial direction of the crushing roller, and the second avoidance section is located on the side of the second tooth closer to the central axis of the crushing roller in the radial direction of the crushing roller.

[0012] Further, the crushing roller includes a rotating shaft and a plurality of crushing teeth. The rotating shaft is arranged in the housing along the second direction and can rotate around its own axis. The number of crushing teeth is equal to the number of blades; the plurality of crushing teeth and the plurality of blades are alternately distributed in sequence in the circumferential direction of the rotating shaft.

[0013] Further, there are also two first feeding rollers; the two first feeding rollers are arranged side by side on the housing along the third direction and are located above the inlet. The third direction is a horizontal direction perpendicular to the second direction. The two first feeding rollers are both arranged along the second direction and can both rotate around their own axes; a first feeding space is defined between the two first feeding rollers.

[0014] Further, the two ends of the connecting pipe are respectively referred to as the feeding end and the material returning end. The feeding end is connected to the outlet, and the material returning end extends into the housing. The part of the connecting pipe extending into the housing is called the material returning section. The material returning section is arranged in the housing along the second direction and is located above the crushing roller. An outlet pipe is arranged on the housing and is arranged along the second direction. The material returning section and the outlet pipe are on the same horizontal plane and are respectively located on both sides of the edge material in the second direction. The end of the outlet pipe along the second direction away from the material returning end extends out of the housing.

[0015] The beneficial effects of the present invention are as follows: When the edge material recycling device for PE plastic production of the present invention recycles the edge material, the crushing roller is driven to rotate to crush the edge material, and the crushed edge material will enter the connecting pipe through the outlet. And the rotation of the crushing roller will drive the blades arranged thereon to rotate. The rotation of the blades can promote the edge material on the crushing roller to flow towards the meshing direction of the crushing roller and the fixed teeth, reduce the accumulation of the edge material, and play an auxiliary role in the crushing of the crushing roller. And during the rotation of the blades, the blades will also slide along the slide rail. When a blade slides to the first sliding section of the slide rail, at this time, the blade and the blade located in front of it will jointly define a cavity with the inner wall surface of the housing. During the process of the blade sliding from the head end to the tail end of the first sliding section, the volume of the cavity gradually decreases. And after the cavity communicates with the outlet, the gas in the cavity can enter the connecting pipe from the outlet, driving the crushed edge material in the connecting pipe to flow in the connecting pipe and helping the edge material in the connecting pipe to be discharged. And the outside air will enter the housing from the inlet to supplement air to the housing. The supplemented air will exert a certain pressure on the edge material accumulated on the crushing roller, promoting the edge material accumulated on the crushing roller to gather together. During the rotation of the crushing roller and the blades, it is easier to bring the edge material into the meshing position of the crushing roller and the fixed teeth, so that the crushing can proceed normally. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the edge material recycling device for PE plastic production of the present invention;

[0018] Figure 2 It is the front view of the overall structure of an embodiment of the edge material recycling device for PE plastic production of the present invention;

[0019] Figure 3 For Figure 2Cross-sectional view along A-A;

[0020] Figure 4 is Figure 3 Enlarged view at B in;

[0021] Figure 5 Cross-sectional view of the overall structure of an embodiment of an edge material recycling device for PE plastic production according to the present invention;

[0022] Figure 6 Cross-sectional view of the overall structure of an embodiment of an edge material recycling device for PE plastic production according to the present invention from another perspective.

[0023] In the figure: 100, support; 110, drive motor; 120, transmission belt; 200, outer shell; 210, fixed teeth; 211, first tooth; 212, second tooth; 220, first feeding roller; 230, second feeding roller; 240, third feeding roller; 250, discharge pipe; 300, crushing roller; 310, rotating shaft; 320, crushing teeth; 400, blades; 410, first elastic member; 500, connecting pipe; 610, first sliding section; 620, second sliding section; 630, third sliding section; 640, fourth sliding section; 650, first avoidance section; 660, second avoidance section; 700, edge material. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] An embodiment of an edge material recycling device for PE plastic production according to the present invention is as Figures 1 to 6 shown.

[0026] An edge material recycling device for PE plastic production includes a support 100, an outer shell 200, a crushing roller 300 and a plurality of blades 400. The outer shell 200 is arranged on the support 100 in the vertical direction, and the arrangement direction of the outer shell 200 is called the first direction. The upper end of the outer shell 200 is provided with an inlet, and the lower end is provided with an outlet, and a connecting pipe 500 is arranged at the outlet. The crushing roller 300 is arranged in the outer shell 200 in the second direction and can rotate around its own axis, and the second direction is the horizontal direction. Fixed teeth 210 are arranged in the outer shell 200, and the crushing roller 300 can rotate and mesh with the fixed teeth 210.

[0027] A plurality of blades 400 are evenly distributed in the circumferential direction of the crushing roller 300. A slide rail is provided inside the housing 200. The blades 400 can rotate synchronously with the crushing roller 300 and can slide along the slide rail, and the blades 400 never contact the fixed teeth 210 during the rotation process. The slide rail includes a first slide section 610. The two ends of the first slide section 610 are respectively referred to as the head end and the tail end. The head end and the tail end are arranged in sequence in the rotation direction of the crushing roller 300, and in the rotation direction of the crushing roller 300, the head end is located on the front side of the tail end. That is, the crushing roller 300 rotates clockwise in the direction shown in Figure 3 and 4 . The direction close to the arrow side of the clockwise rotation in the rotation direction is called the front, and the direction far from the arrow side of the clockwise rotation is called the rear. And the front side and the rear side here will continue to be used in the following description.

[0028] When any blade 400 slides in the first slide section 610, the blade 400 and the blade 400 located on the front side of the blade 400 both slide-seal with the inner wall surface of the housing 200 and jointly define a cavity with the inner wall surface of the housing 200. And during the process of the blade 400 sliding from the head end to the tail end of the first slide section 610, the volume of the cavity gradually decreases, and during the process of the cavity volume decreasing, the cavity can communicate with the outlet.

[0029] In this embodiment, by setting the cooperation of the housing 200, the crushing roller 300, and the connecting pipe 500, when recycling the side material 700 of the bubble film (hereinafter simply referred to as the side material 700), first send the side material 700 into the housing 200 from the inlet side, and then drive the crushing roller 300 to rotate to crush the side material 700. The crushed side material 700 will enter the connecting pipe 500 through the outlet.

[0030] Moreover, the rotation of the crushing roller 300 will drive the rotation of the blades 400 provided thereon. The rotation of the blades 400 can cause the side materials 700 on the crushing roller 300 to flow in the direction where the crushing roller 300 meshes with the fixed teeth 210, reducing the accumulation of the side materials 700 and assisting in the crushing of the crushing roller 300. During the rotation of the blades 400, the blades 400 will also slide along the slide rail. When a blade 400 slides to the first sliding section 610 of the slide rail, at this time, the blade 400 and the blade 400 located in front of this blade 400 will jointly define a cavity with the inner wall surface of the housing 200. During the process of this blade 400 sliding from the head end to the tail end of the first sliding section 610, the volume of the cavity gradually decreases. And after the cavity communicates with the outlet, the gas in the cavity can enter the connecting pipe 500 from the outlet, driving the crushed side materials 700 in the connecting pipe 500 to flow in the connecting pipe 500 and helping the side materials 700 in the connecting pipe 500 to be discharged. And the outside air will enter the housing 200 from the inlet to supplement air to the housing 200. The supplemented air will exert a certain pressure on the side materials 700 accumulated on the crushing roller 300, causing the side materials 700 accumulated on the crushing roller 300 to gather together. During the rotation of the crushing roller 300 and the blades 400, it is easier to bring the side materials 700 into the meshing position of the crushing roller 300 and the fixed teeth 210, enabling the crushing to proceed normally.

[0031] In a further embodiment, there are two fixed teeth 210. The two fixed teeth 210 are arranged in parallel in the housing 200 along the third direction, and the two fixed teeth 210 are respectively located on both sides of the crushing roller 300 along the third direction. The third direction is a horizontal direction perpendicular to the second direction.

[0032] In a further embodiment, multiple blades 400 are all installed on the crushing roller 300 through the first elastic members 410, enabling the blades 400 to expand and contract on the crushing roller 300. The first elastic members 410 are springs.

[0033] Further, the end where the blade 400 is installed on the crushing roller 300 is called the first end, and the end of the blade 400 facing the housing 200 is called the second end. The first end and the second end are arranged in sequence in the rotation direction of the crushing roller 300, and in the rotation direction of the crushing roller 300, the first end is located behind the second end.

[0034] In a further embodiment, the slide rail further includes a second sliding section 620, a third sliding section 630, and a fourth sliding section 640. The first sliding section 610, the second sliding section 620, the third sliding section 630, and the fourth sliding section 640 are sequentially connected in the rotation direction of the crushing roller 300 and form a closed structure. Both the first sliding section 610 and the third sliding section 630 are arranged along the first direction. Both the second sliding section 620 and the fourth sliding section 640 are arc-shaped. When the blade 400 slides within the first sliding section 610 and the second sliding section 620, the second ends of the blade 400 are in sliding seal with the inner wall surface of the housing 200. When the blade 400 slides within the third sliding section 630 and the fourth sliding section 640, the second ends of the blade 400 are arranged away from the inner wall surface of the housing 200, that is, the second ends of the blade 400 do not abut against the housing 200.

[0035] By providing the second sliding section 620, the third sliding section 630, and the fourth sliding section 640, when the crushing roller 300 rotates, the first sliding section 610, the second sliding section 620, the third sliding section 630, and the fourth sliding section 640 limit the blade 400 in the rotation direction of the crushing roller 300.

[0036] Further, both the second sliding section 620 and the fourth sliding section 640 are coaxially arranged with the crushing roller 300. The second sliding section 620 and the fourth sliding section 640 are respectively located on the upper and lower sides of the crushing roller 300. The diameter of the second sliding section 620 is smaller than the diameter of the fourth sliding section 640.

[0037] By making the diameter of the second sliding section 620 smaller than the diameter of the fourth sliding section 640, when the blade 400 slides along the fourth sliding section 640, the blade 400 can further extend, improving the intensity of the blade 400 driving the side material 700 on the upper side of the crushing roller 300 to flow in the direction where the crushing roller 300 and the fixed tooth 210 mesh, and improving the crushing efficiency.

[0038] Even further, the slide rail further includes a first avoidance section 650 and a second avoidance section 660. The first avoidance section 650 is located between the first sliding section 610 and the second sliding section 620, and the second avoidance section 660 is located between the second sliding section 620 and the third sliding section 630. The two fixed teeth 210 are respectively referred to as the first tooth 211 and the second tooth 212. The first avoidance section 650 and the first tooth 211 are sequentially arranged in the radial direction of the crushing roller 300, and the first avoidance section 650 is located on the side closer to the central axis of the crushing roller 300 in the radial direction of the first tooth 211 on the crushing roller 300. The second avoidance section 660 and the second tooth 212 are sequentially arranged in the radial direction of the crushing roller 300, and the second avoidance section 660 is located on the side closer to the central axis of the crushing roller 300 in the radial direction of the second tooth 212 on the crushing roller 300.

[0039] By providing the first avoidance section 650 and the second avoidance section 660, the blade 400 is always prevented from contacting the fixed teeth 210 during rotation.

[0040] In a further embodiment, the crushing roller 300 includes a rotating shaft 310 and a plurality of crushing teeth 320. The rotating shaft 310 is arranged in the housing 200 along the second direction and can rotate about its own axis. The number of the crushing teeth 320 is equal to the number of the blades 400. The plurality of crushing teeth 320 and the plurality of blades 400 are alternately distributed in sequence in the circumferential direction of the rotating shaft 310. The number of the crushing teeth 320 and the blades 400 can be set according to actual needs. In this embodiment, both the crushing teeth 320 and the blades 400 are provided with three.

[0041] Specifically, a driving motor 110 is provided on the bracket 100. A first pulley is provided at the output end of the driving motor 110. One end of the rotating shaft 310 extends out of the housing 200, and a second pulley is provided at the end of the rotating shaft 310 extending out of the housing 200. The first pulley and the second pulley are connected by a transmission belt 120. During use, when the driving motor 110 is started, it will drive the first pulley to rotate, and drive the second pulley to rotate through the first pulley, so that the rotating shaft 310 can rotate about its own axis.

[0042] In a further embodiment, an edge material recycling device for PE plastic production further includes two first feeding rollers 220. The two first feeding rollers 220 are arranged in parallel on the housing 200 along the third direction and are both located above the inlet. The two first feeding rollers 220 are both arranged along the second direction and can both rotate about their own axes. A first feeding space is defined between the two first feeding rollers 220, and the edge material 700 can enter the inlet through the first feeding space.

[0043] Specifically, a driving member is installed on the housing 200. The driving member includes a first motor. The first motor is installed on the housing 200. The output end of the first motor is connected to one of the first feeding rollers 220 through a driving gear, and a driven gear is installed on the other first feeding roller 220. The driven gear meshes with the driving gear. When the first motor is started, the first motor will drive the driving gear and one of the first feeding rollers 220 connected to the driving gear to rotate, and the driving gear and the driven gear mesh, so that the driven gear drives the other first feeding roller 220 connected to it to rotate, and by setting the rotation direction of the first motor, the edge material 700 can be conveyed downward into the inlet.

[0044] Further, a waste recycling device for PE plastic production further includes two second feeding rollers 230. The two second feeding rollers 230 are arranged in parallel in the housing 200 along a third direction and are located below the two first feeding rollers 220. The two second feeding rollers 230 are both arranged along a second direction and can rotate around their own axes. A second feeding space is defined between the two second feeding rollers 230, and the waste 700 entering the housing 200 from the inlet can be conveyed downward through the second feeding space.

[0045] Alternatively, a waste recycling device for PE plastic production further includes two third feeding rollers 240. The two third feeding rollers 240 are arranged in parallel in the housing 200 along a third direction and are located below the two second feeding rollers 230. The two second feeding rollers 230 are both arranged along a second direction and can rotate around their own axes. A third feeding space is defined between the two second feeding rollers 230, and the waste 700 conveyed downward through the second feeding space will enter the third feeding space.

[0046] Specifically, an installation opening is provided on the housing 200, and an installation plate is arranged on the installation opening. The installation plate is detachably installed on the housing 200. During use, the operator can remove the installation plate, then sequentially pass the waste 700 to be broken through the first feeding space, the second feeding space, and the third feeding space, and then install the installation plate on the housing 200.

[0047] Further, the two third feeding rollers 240 are on the side close to the first sliding section 610 in the third direction. Refer to Figure 3 As shown, the crushing roller 300 rotates clockwise. When the waste 700 falls from the third feeding roller 240, it can make the waste 700 closer to the meshing position of the crushing roller 300 and the fixed teeth 210, facilitating direct crushing of the waste 700.

[0048] In another possible embodiment, the two ends of the connecting pipe 500 are respectively referred to as the feeding end and the material returning end. The feeding end is connected to the outlet, and the material returning end extends into the housing 200. The part of the connecting pipe 500 extending into the housing 200 is called the material returning section. The material returning section is arranged in the housing 200 along the second direction and is located above the crushing roller 300. Specifically, in the first direction, the material returning section is located between the two first feeding rollers 220 and the two second feeding rollers 230. An outlet pipe 250 is provided on the housing 200. The outlet pipe 250 is arranged along the second direction. The material returning section and the outlet pipe 250 are on the same horizontal plane and are respectively on both sides of the waste 700 in the second direction. One end of the outlet pipe 250 along the second direction close to the material returning section is in a flared shape, and one end of the outlet pipe 250 along the second direction away from the material returning section extends out of the housing 200.

[0049] Further, the size of the inlet is larger than the size of the outlet, so that the wind velocity passing through the inlet is relatively small.

[0050] An air pump is provided on the support 100. The air pump is connected to one end of the discharge pipe 250 extending out of the housing 200 through an extension pipe. It should be particularly noted that the air pump can only suck the side materials 700 that have already entered the discharge pipe 250, so that the side materials 700 can flow out of the housing 200 through the discharge pipe 250.

[0051] When the crushed side materials 700 pass through the connecting pipe 500, the compressed gas in the cavity will be sent into the connecting pipe 500, driving the crushed side materials 700 in the connecting pipe 500 to flow in the connecting pipe 500, so that the side materials 700 enter the housing 200 again from the return material section. At this time, if there are still uncrushed side materials 700 with bubbles in the crushed side materials 700, then when the air flow blows the side materials 700 out from the discharge end side of the connecting pipe 500, the side materials 700 with bubbles will be subjected to greater air resistance compared to the side materials 700 without bubbles. That is, the crushed side materials 700 with bubbles will be less likely to enter the discharge pipe 250. That is, when the side materials 700 without bubbles are brought into the discharge pipe 250 by the air flow flowing out from the return material section side, the side materials 700 with bubbles will remain between the discharge section and the discharge pipe 250 and be blown down by the air flow flowing downward from the inlet, waiting for secondary crushing. And by making the opening of the inlet larger, the wind force of the air flow flowing downward from the inlet is made smaller than the wind force of the air flow flowing out from the return material section side. If there are still relatively large side materials 700 in the crushed side materials 700, then after the relatively large side materials 700 flow out from the return material section, they will be blocked by the side materials 700 between the first feeding roller 220 and the second feeding roller 230 and fall, waiting for secondary crushing.

[0052] The advantage of this embodiment is that by extending the discharge end of the connecting pipe 500 into the housing 200, compared with directly discharging the side materials 700 after primary crushing through the connecting pipe 500, the unqualified side materials 700 after primary crushing can be secondary crushed, reducing the adverse impact of incomplete crushing of the side materials 700 on subsequent recycling.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An edge material recycling device for PE plastic production, characterized in that: It includes a bracket, a housing, a crushing roller and a plurality of blades; the housing is arranged on the bracket in the vertical direction, and the setting direction of the housing is called the first direction; an inlet is provided at the upper end of the housing, and an outlet is provided at the lower end of the housing, and a connecting pipe is provided at the outlet; the crushing roller is arranged in the housing in the second direction and can rotate around its own axis, and the second direction is the horizontal direction; fixed teeth are arranged in the housing, and the crushing roller can rotate and mesh with the fixed teeth; the plurality of blades are evenly distributed in the circumferential direction of the crushing roller, and slide rails are arranged in the housing, and the blades can rotate synchronously with the crushing roller and can slide along the slide rails, and the blades never contact the fixed teeth during the rotation process; the slide rail includes a first sliding section, and the two ends of the first sliding section are respectively called the head end and the tail end, and the head end and the tail end are arranged in sequence in the rotation direction of the crushing roller, and in the rotation direction of the crushing roller, the head end is located in front of the tail end; when any blade slides in the first sliding section, the blade and the blade located in front of the blade both slide-seal with the inner wall surface of the housing and jointly define a cavity with the inner wall surface of the housing, and during the process of the blade sliding from the head end to the tail end of the first sliding section, the volume of the cavity gradually decreases, and during the process of the cavity volume decreasing, the cavity can communicate with the outlet.

2. The edge material recycling device for PE plastic production according to claim 1, characterized in that: There are two fixed teeth, and the two fixed teeth are arranged in parallel in the housing in the third direction, and the two fixed teeth are respectively located on both sides of the crushing roller in the third direction, and the third direction is the horizontal direction perpendicular to the second direction.

3. The edge material recycling device for PE plastic production according to claim 2, wherein: The plurality of blades are all installed on the crushing roller through first elastic members.

4. The edge material recycling device for PE plastic production according to claim 3, wherein: The end of the blade installed on the crushing roller is called the first end, and the end of the blade facing the housing is called the second end, and the first end and the second end are arranged in sequence in the rotation direction of the crushing roller, and in the rotation direction of the crushing roller, the first end is located behind the second end.

5. The edge material recycling device for PE plastic production according to claim 2, wherein: The slide rail further includes a second sliding section, a third sliding section and a fourth sliding section; the first sliding section, the second sliding section, the third sliding section and the fourth sliding section are sequentially connected in the rotation direction of the crushing roller and form a closed structure; the first sliding section and the third sliding section are both arranged in the first direction, the second sliding section and the fourth sliding section are both arc-shaped, and when the blade slides in the first sliding section and the second sliding section, the blade both slide-seals with the inner wall surface of the housing; when the blade slides in the third sliding section and the fourth sliding section, the blade is arranged away from the inner wall surface of the housing.

6. The edge material recycling device for PE plastic production according to claim 5, characterized in that: The second sliding section and the fourth sliding section are both coaxially arranged with the crushing roller, the second sliding section and the fourth sliding section are respectively located on the upper and lower sides of the crushing roller, and the diameter of the second sliding section is smaller than the diameter of the fourth sliding section.

7. An edge material recycling device for PE plastic production according to claim 5, characterized in that: The slide rail further includes a first avoidance section and a second avoidance section, the first avoidance section is located between the first sliding section and the second sliding section, and the second avoidance section is located between the second sliding section and the third sliding section; the two fixed teeth are respectively called the first tooth and the second tooth, the first avoidance section and the first tooth are arranged in sequence in the radial direction of the crushing roller, and the first avoidance section is located on the side of the first tooth close to the central axis of the crushing roller in the radial direction of the crushing roller, the second avoidance section and the second tooth are arranged in sequence in the radial direction of the crushing roller, and the second avoidance section is located on the side of the second tooth close to the central axis of the crushing roller in the radial direction of the crushing roller.

8. The edge material recycling device for PE plastic production according to claim 1, wherein: The crushing roller includes a rotating shaft and a plurality of crushing teeth. The rotating shaft is arranged in the housing along the second direction and can rotate about its own axis. The number of crushing teeth is equal to the number of blades. The plurality of crushing teeth and the plurality of blades are alternately distributed in sequence in the circumferential direction of the rotating shaft.

9. The edge material recycling device for PE plastic production according to claim 1, characterized in that: It further includes two first feeding rollers. The two first feeding rollers are arranged in parallel on the housing along the third direction and are located above the inlet. The third direction is a horizontal direction perpendicular to the second direction. Both of the two first feeding rollers are arranged along the second direction and can rotate about their own axes. A first feeding space is defined between the two first feeding rollers.

10. The edge material recycling device for PE plastic production according to claim 1, wherein: The two ends of the connecting pipe are respectively referred to as the feeding end and the material-returning end. The feeding end is connected to the outlet, and the material-returning end extends into the housing. The part of the connecting pipe extending into the housing is referred to as the material-returning section. The material-returning section is arranged in the housing along the second direction and is located above the crushing roller. A discharge pipe is arranged on the housing and is arranged along the second direction. The material-returning section and the discharge pipe are on the same horizontal plane and are respectively located on both sides of the side material in the second direction. One end of the discharge pipe extending away from the material-returning end along the second direction extends out of the housing.

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