Quick-change structure for melting and filtering fragments of plastic bottles

Abstract

The utility model relates to a quick-change structure for melting and filtering fragments of a plastic bottle. The quick-change structure comprises a discharging bin tank and an auger shaft melting and conveying cylinder device, plastic bottle fragments are stored in the discharging bin tank and then fall into the auger shaft conveying cylinder device to be heated to be in a molten state to be conveyed. An intermediate material cavity I is arranged at a discharge hole of the auger shaft melting conveying cylinder device in a communicating manner, and the space of the intermediate material cavity I can be controllably increased and decreased; the middle material cavity I is connected with a first conveying pipe barrel, and a switch mechanism A and a detachable and replaceable filter element pipe barrel section II are arranged on the first conveying pipe barrel; the filter element tube shell section II is fixed on an extension arm of the forward and reverse self-locking rotating device, and a plurality of extension arms are arranged on the forward and reverse self-locking rotating device. The utility model has the beneficial effects that the quick and semi-automatic replacement of the filter element can be realized, and the production efficiency is improved; the frequency of replacing the filter element is reduced; and a good sealing effect can be kept during quick replacement.

Description

TECHNICAL FIELD

[0001] The utility model relates to plastic recycling technical field, especially a quick change formula structure of melting filtration to plastic bottle fragment. BACKGROUND

[0002] Plastic products, such as plastic bottles, are common household garbage in life, and these plastic bottles are difficult to degrade in the plastic state. The current solution is to recycle these plastic bottles and then reuse them.

[0003] In the secondary utilization mode, it can be in the form of: crushing plastic bottles into fragments, then rinsing them clean, then removing impurities (using the difference in density to make impurities suspended and removed), then further removing impurities through a material selection camera, then removing unwanted colors through a color selection camera, and retaining plastic fragments of the desired color, then drying; Then melt, filter, draw and other methods to form some polyester products.

[0004] The formed polyester products can be cotton-type products of polyester staple, which are mainly used in the cotton spinning industry. They can be spun alone or blended with cotton, viscose fiber, hemp, wool, and vinylon, and the obtained yarn is mainly used for clothing weaving, and can also be used for home furnishing fabrics, packaging cloth, filling material and thermal insulation material. Three-dimensional hollow products are mainly used for non-woven fabrics for medical and health care: surgical gowns, protective clothing, sterilization cloth, masks, diapers; non-woven fabrics for civilian use, wet cloth, magic towel, beauty products, sanitary napkins, etc. Non-woven fabrics for household use: wall cloth, tablecloth, bed sheet, etc. Non-woven fabrics for clothing: lining, adhesive lining, fluff, and shaped cotton. Non-woven fabrics for industrial use: roofing waterproof roll material and asphalt base material, reinforcing material, polishing material, packaging bag, etc.; it can also be used as space cotton, thermal and sound insulation material, oil absorption felt, shoe material and filling material for sofas and toys. Due to the high strength, wear resistance, acid and alkali resistance, high temperature resistance, and good electrical insulation of synthetic fibers, they have been widely used in various fields of the national economy, providing a broad prospect for the secondary utilization of plastic bottles.

[0005] When the plastic fragments are dried and melted, the melted plastic needs to be filtered again to further remove some particulate impurities.

[0006] At present, the general structure of the melting-filtering device used by various companies is: a horizontally arranged high-temperature heating cylinder is arranged, a auger shaft is arranged in the high-temperature heating cylinder, the auger shaft conveys the plastic fragments in the high-temperature heating cylinder, so that the plastic fragments are melted in the cylinder and continuously conveyed forward by the auger shaft; Then fall into a vertical cylinder, a filter element is arranged in the vertical cylinder, and the filter element filters the impurities in the melted plastic.

[0007] The problem is that when the auger shaft transports the melted plastic, the melted plastic will have a certain pressure, that is, the melted plastic above the filter element in the vertical cylinder has a certain pressure, and under the action of this pressure, some particles that should be filtered out will be forced out of the filter element, affecting the filtering effect. The problem is that this forced extrusion can cause the filter holes of the filter element to become larger, and can also cause the particles to be directly stuck in the filter element, thereby blocking the filter holes, further affecting the filtering effect, and thus the filter element needs to be replaced frequently. Moreover, when replacing the filter element, the production line must be stopped, and the filter element must be replaced manually, which affects the production efficiency.

[0008] The company has designed a new production line for producing polyester products by recycling plastic bottle fragments, and improvements have been made to the previous traditional production line (commonly used by many manufacturers) to address various shortcomings. The present application mainly improves the melting and filtering part. SUMMARY

[0009] The utility model discloses a quick-change structure for melting and filtering plastic bottle fragments, which overcomes the shortcomings of the prior art and solves the problem of frequent replacement of filter elements and inconvenience in replacement, thereby improving production efficiency.

[0010] The utility model discloses a quick-change structure for melting and filtering plastic bottle fragments, which overcomes the shortcomings of the prior art and solves the problem of frequent replacement of filter elements and inconvenience in replacement, thereby improving production efficiency.

[0011] The intermediate material cavity I is connected to the first conveying pipe cylinder, and a switch mechanism A is arranged on the first conveying pipe cylinder. The first conveying pipe cylinder also has an energy-saving detachable and replaceable filter element pipe cylinder section II.

[0012] The intermediate material cavity I is connected to the first conveying pipe cylinder, and a switch mechanism A is arranged on the first conveying pipe cylinder. The first conveying pipe cylinder also has an energy-saving detachable and replaceable filter element pipe cylinder section II.

[0013] The filter element pipe cylinder section II is fixed to one of the extending arms of the positive and negative self-locking rotating device. The positive and negative self-locking rotating device has a plurality of extending arms, and each extending arm is fixed with one filter element pipe cylinder section II.

[0014] If the filter core needs to be replaced: the switch mechanism will close the first conveying pipe cylinder, increase the space of the center material cavity I, and store the excess material output from the auger shaft melting conveying cylinder device in the center material cavity I with increased space; the positive and negative self-locking rotating device rotates, removes the filter core pipe cylinder section II at the first conveying pipe cylinder, and places the new filter core pipe cylinder section II at the first conveying pipe cylinder; the new filter core pipe cylinder section II is provided with a plurality of filter cores, and the filter cores can be artificially replaced in advance.

[0015] As a preferred technical solution of the present application, the intermediate material cavity I comprises a horizontal pipe cylinder A and a horizontal pipe cylinder B; the left end of the horizontal pipe cylinder A is sleeved on the output end of the auger shaft melting conveying cylinder device and is closed after being sleeved, and the left end of the horizontal pipe cylinder B is adaptively inserted into the right end of the horizontal pipe cylinder A and the right end of the horizontal pipe cylinder B is closed; the right end of the horizontal pipe cylinder B is connected with the horizontal reciprocating action mechanism. When the horizontal reciprocating action mechanism performs horizontal action, the internal space of the intermediate material cavity I is increased or reduced.

[0016] Further, the intermediate material cavity I is provided with a pressure sensor in the cavity, and the pressure sensor and the horizontal reciprocating action mechanism are electrically connected with the control panel. If the pressure of the intermediate material cavity I is less than the set pressure, the horizontal reciprocating action mechanism acts to the left to reduce the internal space of the intermediate material cavity I; if the pressure of the intermediate material cavity I is greater than the set pressure, the horizontal reciprocating action mechanism acts to the right to increase the internal space of the intermediate material cavity I; so that the pressure in the intermediate material cavity I is kept stable.

[0017] As a preferred technical solution of the present application, the filter core pipe cylinder section II comprises a pipe cylinder section and filter cores, and a plurality of filter cores are installed in the pipe cylinder section.

[0018] Further, a cutoff plate is fixed in the lower end of the pipe cylinder section, and the cutoff plate blocks the lower end of the pipe cylinder section; a plurality of mounting through holes are formed in the cutoff plate, and the lower ends of the filter cores are inserted into the mounting through holes; a circular pressing frame is also placed in the pipe cylinder section, and the circular pressing frame presses the upper ends of the filter cores, and the circular pressing frame is fixed on the protrusions on the inner wall of the pipe cylinder section by screws.

[0019] As the preferred technical scheme of the present application, the upper and lower ends of the filter core pipe cylinder section II are provided with outer annular plates A, and the corresponding outer annular plates B are provided at the corresponding positions of the first conveying pipe cylinder. Annular grooves are formed in the outer annular plates A, and annular members and O-rings are arranged in the annular grooves, with the O-rings being located outside the annular members. A plurality of electric control telescopic mechanisms are arranged in the annular grooves in the circumferential direction, and the two ends of the electric control telescopic mechanisms are respectively abutted against the annular members and the groove bottoms of the annular grooves. When the filter core pipe cylinder section II is removed from the first conveying pipe cylinder, the electric control telescopic mechanisms on the filter core pipe cylinder section II are retracted, so that the O-rings do not seal; when the filter core pipe cylinder section II is replaced to the first conveying pipe cylinder, the electric control telescopic mechanisms on the filter core pipe cylinder section II are extended, so that the O-rings are abutted against the end faces of the outer annular plates B to seal.

[0020] Further, a plurality of blind holes are formed in the circumferential direction of the annular grooves, and electric control telescopic pins are arranged in the blind holes.

[0021] As the preferred technical scheme of the present application, the switch mechanism A is electrically connected with the control panel; the switch mechanism A is closed when the filter core pipe cylinder section II is replaced, and the switch mechanism A is opened after the replacement of the filter core pipe cylinder section II is completed.

[0022] As the preferred technical scheme of the present application, the lower end of the discharging bin is provided with a switch mechanism B, and the switch mechanism B is electrically connected with the control panel.

[0023] As the preferred technical scheme of the present application, the positive and negative self-locking rotating device is a positive and negative self-locking rotating motor, a sleeve ring is sleeved on the output shaft of the positive and negative self-locking rotating motor, a plurality of extending arms are arranged in the circumferential direction of the sleeve ring, and a clamp assembly is arranged at the end of each extending arm.

[0024] The utility model has the following advantages:

[0025] (1) The filter core can be quickly and semi-automatically replaced, and the production efficiency is improved.

[0026] In the traditional replacement process of the filter core, the entire filter core pipe cylinder section II needs to be removed from the first conveying pipe cylinder, then a new filter core is replaced, and then the filter core pipe cylinder section II is installed on the first conveying pipe cylinder, so that the entire process takes a long time and needs to be replaced after the entire production line is stopped, thereby affecting the production efficiency.

[0027] In the present scheme, the positive and negative self-locking rotating device and the structure of the filter core pipe cylinder section II are designed; when replacing, the filter core in the idle filter core pipe cylinder section II is replaced by human beings in advance; if the filter core in the filter core pipe cylinder section II on the first conveying pipe cylinder needs to be replaced, the positive and negative self-locking rotating device only needs to be rotated by a certain angle, which is very simple and convenient, thereby improving the work efficiency.

[0028] (2) The probability of damage to the filter core is reduced, thereby reducing the frequency of replacement of the filter core and improving the production efficiency.

[0029] In the prior device, when the fragments are melted by the auger shaft melting conveying cylinder device, the melted plastic is extruded out under the action of the auger shaft, and enters the first conveying cylinder, a filter core pipe cylinder section II is arranged at the conveying cylinder, and a filter core is arranged in the filter core pipe cylinder section II; since the auger shaft is always extruding new melted plastic, the pipe section of the first conveying cylinder between the auger shaft melting conveying cylinder device and the filter core pipe cylinder section II has a large pressure; if the pressure is too large, some large impurities will be extruded into the filter hole of the filter core (normally, the large particles should not enter the filter hole), thereby blocking or expanding the filter hole, and the filter core is damaged, so the filter core needs to be frequently replaced, thereby affecting the production efficiency;

[0030] In the present scheme, the auger shaft melting conveying cylinder device is connected with the first conveying cylinder through the intermediate material cavity I, the intermediate material cavity I is provided with a pressure sensor and has an inner cavity space with adjustable size; if the pressure is too large, the pressure can be adjusted, thereby avoiding damage to the filter core, and if the pressure is too small, the pressure is increased, thereby maintaining good filtering effect.

[0031] In addition, the space with adjustable space size of the intermediate material cavity I can temporarily store the excess melted plastic extruded from the auger shaft melting conveying cylinder device when the filter core in the filter core pipe cylinder section II is replaced.

[0032] (3) The sealing design of the corresponding O-ring in the filter core pipe cylinder section II avoids damage to the filter core pipe cylinder section II during replacement; that is, even if the filter core pipe cylinder section II is quickly replaced, the present scheme can still maintain good sealing effect. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a structure schematic view of the present application;

[0034] Figure 2 It is a structure schematic view of the present application; Figure 1 It is a structure schematic view of the present application after removing the discharging bin;

[0035] Figure 3 It is a structure schematic view among the first conveying pipe cylinder, the intermediate material cavity I, the filter core pipe cylinder section II and the positive and negative self-locking rotating device;

[0036] Figure 4 It is a structure schematic view of the filter core pipe cylinder section II;

[0037] Figure 5 It is a structure schematic view of the present application; Figure 4 It is an enlarged view of A-A in the present application;

[0038] Figure 6 It is a structure schematic view of the end surface of the outer annular disc of the filter core pipe cylinder section II;

[0039] Fig. 10 - Feed bin, 20 - auger shaft melting delivery cylinder device, 30 - first delivery tube cylinder;

[0040] 40 - positive and negative self-locking rotating device, 41 - collar, 42 - hoop assembly;

[0041] 51 - tube cylinder section, 52 - filter core, 53 - cut-off plate, 54 - circular pressing frame, 55 - annular groove, 56 - ring-shaped part, 57 - O-shaped ring, 58 - electric control telescopic mechanism, 59 - blind hole;

[0042] 61 - horizontal tube cylinder A, 62 - horizontal tube cylinder B, 63 - horizontal reciprocating mechanism, 64 - pressure sensor. DETAILED DESCRIPTION

[0043] The utility model will be further described below in combination with the drawings, but the protection scope of the utility model is not limited to the following.

[0044] It should be noted that the orientation or positional relationship indicated by "left", "right" and the like is based on the orientation or positional relationship shown in the drawings, or is the orientation or positional relationship commonly used when the utility model product is used, or is the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only used to facilitate the description of the utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0045] It should be noted that the embodiments in the utility model and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0046] It should be noted that the structure of the existing "crushed material bottle fragments melting-filtering" is described.

[0047] ①In a factory building with multiple floors, the drop tank is arranged at the top floor, the upper end of the drop tank is the material inlet (the treated material is put into the drop tank through manual / conveyor from the material inlet), the lower end of the drop tank is provided with an opening and closing mechanism B (usually a circular plate, a rotating shaft is arranged along the radial direction of the circular plate, a servo motor is arranged on the rotating shaft, and the opening and closing are realized by the rotation of the circular plate). Below the drop tank, a auger shaft melting conveying cylinder device is arranged; the auger shaft melting conveying cylinder device is in the shape of a long cylinder, an auger shaft is arranged in it, and an electric heating element is arranged on the inner wall of the auger shaft melting conveying cylinder device; one end of the auger shaft is driven by a driving motor; a square tank is arranged at the top of one end of the auger shaft melting conveying cylinder device; during operation, the fragments in the drop tank fall into the square tank, and then enter the inner wall of the auger shaft melting conveying cylinder device; under the action of the auger shaft, the fragments are pushed from one end to the other end, and the fragments are gradually heated and melted during the pushing process to form molten plastic.

[0048] ②The tail end of the auger shaft melting conveying cylinder is connected with a vertically arranged conveying pipe cylinder, so that the molten plastic enters the conveying pipe cylinder; a detachable filter core pipe cylinder section is arranged on the conveying pipe cylinder, and a filter core is arranged in the filter core pipe cylinder section; when the filter core needs to be replaced, the entire production line needs to be stopped, then the filter core pipe cylinder section is detached, a new filter core is installed, and then the filter core pipe cylinder section is installed back. Of course, in order to keep the molten plastic in a molten state, some temperature maintaining point heating elements are also arranged on the inner wall of the conveying pipe cylinder.

[0049] The problem is that the filter core is easily damaged and inconvenient to replace (for specific reasons, see the background art).

[0050] The present scheme mainly solves the problem of adjusting the pressure of the molten plastic by adding an intermediate material cavity I, and realizes the quick replacement of the filter core pipe cylinder section by adding a forward and reverse self-locking rotating device 40. Of course, in order to better replace and ensure the sealing performance after replacement, the structure of the filter core pipe cylinder section itself is improved.

[0051] As shown in Figures 1-6 Fig. 1, a quick replacement structure for melting and filtering plastic bottle fragments, comprising a drop tank 10, an auger shaft melting conveying cylinder device 20 is arranged below the drop tank 10, plastic bottle fragments are stored in the drop tank 10, and when the fragments are discharged into the auger shaft melting conveying cylinder device 20, they are heated to a molten state for conveying;

[0052] Further comprising an intermediate material cavity I, the intermediate material cavity I is in communication with the discharge port of the auger shaft melting conveying cylinder device 20, and the space of the intermediate material cavity I can be controllably enlarged and reduced;

[0053] Further comprising a first conveying pipe cylinder 30, a filter core pipe cylinder section II; the first conveying pipe cylinder 30 is connected to the bottom of the middle material cavity I and is vertically arranged; a switch mechanism A 31 is arranged on the first conveying pipe cylinder 30, and an energy-saving detachable and replaceable filter core pipe cylinder section II is also arranged on the first conveying pipe cylinder 30;

[0054] Further comprising a positive and negative self-locking rotating device 40; the positive and negative self-locking rotating device 40 has a plurality of extending arms, and the end of each extending arm is fixed with a filter core pipe cylinder section II;

[0055] In addition, a pressure sensor 64 is arranged in the cavity of the middle material cavity I;

[0056] In addition, a switch mechanism A is arranged in the first conveying pipe cylinder 30 and above the filter core pipe cylinder section II;

[0057] When working: ① in the normal melting-filtering state, when the pressure sensor 64 detects that the pressure of the middle material cavity I is too large, the space of the middle material cavity I is increased, so that the pressure in the middle material cavity I is reduced, thereby avoiding that the particulate impurities in the melted plastic force the filter holes in the filter core 52 in the filter core pipe cylinder section II, thereby avoiding that the particulate impurities block or expand the filter holes of the filter core 52, and avoiding frequent replacement of the filter core 52;

[0058] ② when the filter core 52 needs to be replaced, the switch mechanism A closes the first conveying pipe cylinder 30, at the same time, the space of the middle material cavity I is increased, and at the same time, the discharging of the discharging bin 10 is reduced, so that the excess material output from the auger shaft melting conveying cylinder device 20 is stored in the increased central material cavity I; then, the positive and negative self-locking rotating device 40 rotates to move the filter core pipe cylinder section II at the first conveying pipe cylinder 30 and to place a new filter core pipe cylinder section II at the first conveying pipe cylinder 30, and the filter core 52 in the new filter core pipe cylinder section II can be artificially replaced in advance; therefore, the whole replacement can be quickly completed, and the normal production of the production line is not affected.

[0059] The middle material cavity I is further described below.

[0060] Reference is made to Figure 2, the intermediate material cavity I includes horizontal tube A61, horizontal tube B62; wherein, the left end of horizontal tube A61 is sleeved on the right end output of auger shaft melting conveying cylinder device 20, and after sleeving, the left end of horizontal tube A61 is closed (in the figure, the left end of horizontal tube A61 is directly fixed by abutting against the side of the supporting base). The left end of horizontal tube B62 is adaptively inserted into the right end of horizontal tube A61, and the right end of horizontal tube B62 is closed. The structure of the insertion of horizontal tube A61 and horizontal tube B62 forms the internal space of the intermediate material cavity I. The right end of horizontal tube B62 is connected with horizontal reciprocating mechanism 63, forming the structure of adjusting the internal space of the intermediate material cavity I.

[0061] Further, the horizontal reciprocating mechanism 63 selects a telescopic air cylinder or a telescopic oil cylinder, and the horizontal reciprocating mechanism 63 is electrically connected with the control panel. In addition, the structure of switch mechanism A is similar to that of switch mechanism B, and both are electrically connected with the control panel. In addition, the pressure sensor 61 is also electrically connected with the control panel.

[0062] When working, if the pressure of the intermediate material cavity I is less than the set pressure, the horizontal reciprocating mechanism 63 acts to the left to reduce the internal space of the intermediate material cavity I; if the pressure of the intermediate material cavity I is greater than the set pressure, the horizontal reciprocating mechanism 63 acts to the right to increase the internal space of the intermediate material cavity I; so that the pressure in the intermediate material cavity I is kept stable.

[0063] The positive and negative self-locking rotating device 40 will be further described below.

[0064] Referring to Figure 3 and Figure 4 , the positive and negative self-locking rotating device 40 is a positive and negative self-locking rotating motor, a sleeve ring 41 is sleeved on the output shaft of the positive and negative self-locking rotating motor, a plurality of extension arms are arranged on the circumference of the sleeve ring 41, and a hoop assembly 42 is arranged at the end of the extension arm. The hoop assembly 42 has various designs, for example, two hinged half cylinders, the upper and lower ends of the two half cylinders have connecting ears; when the two half cylinders hoop around the positive and negative self-locking rotating device 40, the connecting ears are locked by bolts.

[0065] Further, the positive and negative self-locking rotating device 40 has at least two extending arms. For example, assuming that there are two extending arms, normally one extending arm clamps the filter cartridge section II and makes it butt joint with the first conveying cartridge 30, and the other extending arm also clamps the filter cartridge section II, and the filter element 52 in the filter cartridge section II is replaced artificially. When it is needed to replace the filter element 52 in the filter cartridge section II which is in communication with the first conveying cartridge 30, the positive and negative self-locking rotating motor rotates 180° clockwise (or counterclockwise) - thereby moving the old filter cartridge section II away from the first conveying cartridge 30 and moving the new filter cartridge section II to butt joint with the first conveying cartridge 30, and when it is moved to the position, the positive and negative self-locking rotating motor is locked, thereby fixing the position of the new filter cartridge section II; then, the filter element 52 in the old filter cartridge section II which is moved out is replaced artificially. The whole replacement process is very fast, and even if the molten plastic cannot flow downward during the process, the subsequent wire pressing process still proceeds normally (because the equipment in the subsequent wire pressing process still stores the molten plastic, and even if the filter cartridge section II is replaced for a short time, the molten plastic stored in the equipment in the wire pressing process can still ensure normal wire pressing. In a word, even if the filter cartridge section II is replaced, it does not affect the normal operation of the subsequent process).

[0066] The filter cartridge section II will be further described below.

[0067] In order to ensure sufficient filtering capacity, a plurality of filter elements 52 are arranged in the filter cartridge section II.

[0068] Referring to Figure 3 and Figure 4 , the filter cartridge section II comprises a cartridge section 51, a filter element 52, a cutoff plate 53, and a circular pressing frame 52.

[0069] The cutoff plate 53 is welded and fixed in the lower end of the cartridge section 51, thereby cutting off the cartridge section 51; a plurality of mounting through holes are formed in the cutoff plate 53 and penetrate the cutoff plate 53 from top to bottom.

[0070] The filter element 52 is an outward-to-inward flow filter element, and both the upper end and the lower end of the filter element 52 have pipe heads, the pipe head at the upper end is blocked, and the pipe head at the lower end is not blocked; during operation, the molten plastic enters the filter element 52 from the outside and then flows out from the pipe head at the lower end.

[0071] In addition, a nut is screwed on the pipe head at the lower end of the filter element 52.

[0072] The circular pressing frame 54 is a shelf-shaped frame having a plurality of legs, and the lower surface of the circular pressing frame 54 has a plurality of pressing holes.

[0073] In addition, the inner wall of the upper end of the cartridge section 51 has a plurality of protrusions.

[0074] When installing, the pipe head of the lower end of each filter core 52 is inserted into the installation through hole of the cutting plate 53, and the corresponding nut is abutted against the surface of the cutting plate 51; then the circular pressing frame 54 is pressed at the upper end of each filter core 52, and the pipe head of the upper end of each filter core 52 is inserted into the pressing hole; and the circular pressing frame 54 is fixed on the protrusion of the inner wall of the pipe cylinder section 51 by using a screw.

[0075] The structure of the filter core pipe cylinder section II ensures the firm fixing of the filter core 52, and the replacement and installation of the filter core 52 are relatively fast, which only needs to be screwed off. It should be noted that when the filter core 52 is replaced, the filter core pipe cylinder section II must be just removed from the first conveying cylinder 30 at this time, and the plastic is still in a molten state.

[0076] Of course, if it is faster to replace, some magnetic methods can also be selected to magnetically attract the circular pressing frame 54 to the protrusion of the inner wall of the pipe cylinder section 51.

[0077] The filter core pipe cylinder section II will be further described below.

[0078] When the filter core pipe cylinder section II is replaced, the sealing performance of the filter core pipe cylinder section II and the first conveying cylinder 30 when they are docked needs to be considered.

[0079] Referring to Figure 4 , Figure 6 and Figure 6 , the upper and lower ends of the filter core pipe cylinder section II have an outer annular disc A (or the upper and lower ends of the pipe cylinder section 51 have an outer annular disc A), and the corresponding outer annular disc B is also provided at the corresponding position of the first conveying cylinder 30;

[0080] A ring groove 55 is opened on the outer annular disc A, a plurality of blind holes 59 are opened in the circumferential direction of the ring groove 55, and an electrically controlled telescopic pin 58 is placed in the blind hole; a ring-shaped part 56 is placed in the ring groove 55, and the outer end of each electrically controlled telescopic pin 58 is abutted against the ring-shaped part 56; an O-ring 57 is also placed in the ring groove 55, and the O-ring 57 is located outside the ring-shaped part 56;

[0081] When the filter core pipe cylinder section II is replaced: when the new filter core pipe cylinder section II has not been moved to the first conveying cylinder 30, the corresponding O-ring 57 is installed on the new filter core pipe cylinder section II, and the electrically controlled telescopic pin 58 is retracted, so that the O-ring 57 is sunk in the ring groove 55--that is, the O-ring 57 does not protrude from the ring groove 55; when the new filter core pipe cylinder section II is moved to the first conveying cylinder 30, the electrically controlled telescopic pin 58 is extended, and the electrically controlled telescopic pin 58 abuts the ring-shaped part 56 outward--so that the O-ring 57 moves outward, thereby pressing the O-ring 57 against the outer annular disc B, to achieve automatic sealing.

[0082] The sealing design of the filter core pipe cylinder segment II is mainly to prevent the O-ring 57 from coming out of the annular groove 55 when replacing the filter core pipe cylinder segment II, so as not to affect normal replacement (if it comes out, the outer annular disc A and the outer annular disc B will form a shearing action during replacement, which will cut the O-ring 57).

[0083] It should be noted that the electric control telescopic pin 58 can be selected as an electromagnetic telescopic pin (the electromagnetic telescopic pin is a commonly known component, and there are various styles on the market, for example, it can have the following structure: a circular pipe segment, a pin shaft capable of moving in the axial direction is installed in the circular pipe segment, a permanent magnet is arranged at the bottom of the inner end of the pin shaft, and an electromagnetic coil is arranged at the bottom of the lower end of the pipe segment. By changing the charging direction of the electromagnetic coil, the pin shaft can be extended or retracted).

[0084] Further, the pipe cylinder segment 51 is provided with a hole, and the cable of the electric control telescopic pin 58 is led out from the hole, and the hole is also sealed by glue; therefore, the cables along the extension arms are concentrated on the ring sleeve 41 of the positive and negative self-locking rotating device 40, and the positive and negative self-locking rotating device 40 can be rotated clockwise in the first replacement, counterclockwise in the second replacement, and clockwise in the third replacement (not always clockwise, nor always counterclockwise), which can avoid the entanglement of the led-out cables when the positive and negative self-locking rotating device 40 rotates.

[0085] The above embodiments only express the preferred implementation, which is described in detail and specifically, but it cannot be understood as a limitation of the scope of the utility model patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model.

Claims

1. A quick-change structure for melting and filtering plastic bottle fragments, comprising a feed bin (10) and an auger shaft melting and conveying cylinder device (20) arranged below the feed bin (10), plastic bottle fragments being stored in the feed bin (10) and being conveyed in a molten state when discharged into the auger shaft melting and conveying cylinder device (20) and heated, characterized in that: a middle material cavity I is arranged in communication with the discharge port of the auger shaft melting and conveying cylinder device (20), and the space of the middle material cavity I can be controllably increased and decreased; the middle material cavity I is connected with a first conveying pipe cylinder (30), a switching mechanism A (31) is arranged on the first conveying pipe cylinder (30), and an energy-saving detachable and replaceable filter core pipe cylinder section II is further arranged on the first conveying pipe cylinder (30); the filter core pipe cylinder section II is fixed on one extending arm of a positive and negative self-locking rotating device (40), a plurality of extending arms are arranged on the positive and negative self-locking rotating device (40), and one filter core pipe cylinder section II is fixed on each extending arm; if the filter core (52) needs to be replaced, the switching mechanism closes the first conveying pipe cylinder (30), the space of the middle material cavity I is increased, the excess material output from the auger shaft melting and conveying cylinder device (20) is stored in the middle material cavity I with the increased space, the positive and negative self-locking rotating device (40) is rotated, the filter core pipe cylinder section II at the first conveying pipe cylinder (30) is removed, and a new filter core pipe cylinder section II is arranged at the first conveying pipe cylinder (30); a plurality of filter cores (52) are arranged in the new filter core pipe cylinder section II, and the filter cores (52) can be artificially replaced in advance. The middle material cavity I comprises a horizontal pipe cylinder A (61) and a horizontal pipe cylinder B (62); the left end of the horizontal pipe cylinder A (61) is sleeved on the output end of the auger shaft melting and conveying cylinder device (20) and is closed after being sleeved, the left end of the horizontal pipe cylinder B (62) is adaptively inserted into the right end of the horizontal pipe cylinder A (61) and the right end of the horizontal pipe cylinder B (62) is closed; the right end of the horizontal pipe cylinder B (62) is connected with a horizontal reciprocating action mechanism (63); when the horizontal reciprocating action mechanism (63) performs horizontal action, the internal space of the middle material cavity I is increased or decreased. A pressure sensor (64) is arranged in the cavity of the middle material cavity I, and the pressure sensor (64) and the horizontal reciprocating action mechanism (63) are electrically connected with a control panel; if the pressure of the middle material cavity I is less than a set pressure, the horizontal reciprocating action mechanism (63) acts to the left to decrease the internal space of the middle material cavity I; if the pressure of the middle material cavity I is greater than the set pressure, the horizontal reciprocating action mechanism (63) acts to the right to increase the internal space of the middle material cavity I; the pressure in the middle material cavity I is kept stable. The filter core pipe cylinder section II comprises a pipe cylinder section (51) and a filter core (52), and a plurality of filter cores (52) are arranged in the pipe cylinder section (51). A cutoff plate (53) is fixed in the lower end of the pipe cylinder section (51), and the cutoff plate (53) blocks the lower end of the pipe cylinder section (51).

2. The quick-change structure for melting and filtering plastic bottle fragments according to claim 1, characterized in that: ​ ​ ​ 3. The quick-change structure for melting and filtering plastic bottle fragments according to claim 2, characterized in that: ​ ​ 4. The quick-change structure for melting and filtering plastic bottle fragments according to claim 1, characterized in that: ​ 5. The quick-change structure for melting and filtering plastic bottle fragments according to claim 4, characterized in that: ​ A plurality of mounting through holes are formed in the cutting plate (53), and the lower ends of the filter cartridges (52) are inserted into the mounting through holes; A circular pressing frame (54) is further arranged in the pipe cylinder section (51), the circular pressing frame (54) is pressed on the upper ends of the filter cartridges (52), and the circular pressing frame (54) is fixed on the protrusions on the inner wall of the pipe cylinder section (51) by screws.

6. The quick-change structure for melting and filtering plastic bottle fragments according to claim 1, characterized in that: The upper and lower ends of the filter cartridge pipe cylinder section II have an outer annular disc A, and the corresponding outer annular disc B is arranged at the corresponding position of the first conveying pipe cylinder (30); A plurality of electric control telescopic mechanisms (58) are arranged in the annular groove (55) in the circumferential direction, and the two ends of the electric control telescopic mechanism abut against the annular piece (56) and the groove bottom of the annular groove (55) respectively. When the filter cartridge pipe cylinder section II is removed from the first conveying pipe cylinder (30), the electric control telescopic mechanism (58) on the filter cartridge pipe cylinder section II is retracted, so that the O-shaped ring (57) is not sealed; when the filter cartridge pipe cylinder section II is replaced into the first conveying pipe cylinder (30), the electric control telescopic mechanism (58) on the filter cartridge pipe cylinder section II is extended, so that the O-shaped ring (57) abuts against the end face of the outer annular disc B to be sealed.

7. The quick-change structure for melting and filtering plastic bottle fragments according to claim 6, characterized in that: A plurality of blind holes (59) are formed in the circumferential direction of the annular groove (55), and an electric control telescopic pin is arranged in the blind hole.

8. The quick-change structure for melting and filtering plastic bottle fragments according to claim 1, characterized in that: The switch mechanism A is electrically connected with the control panel; the switch mechanism A is closed when the filter cartridge pipe cylinder section II is replaced, and the switch mechanism A is opened after the replacement of the filter cartridge pipe cylinder section II is completed.

9. The quick-change structure for melting and filtering plastic bottle fragments according to claim 1, characterized in that: The lower end of the discharging bin tank (10) is provided with a switch mechanism B, and the switch mechanism B is electrically connected with the control panel.

10. The quick-change structure for melting and filtering plastic bottle fragments according to claim 1, characterized in that: The positive and negative self-locking rotating device (40) is a positive and negative self-locking rotating motor, a sleeve ring (41) is sleeved on the output shaft of the positive and negative self-locking rotating motor, a plurality of extension arms are arranged in the circumferential direction of the sleeve ring (41), and a hoop assembly (42) is arranged at the end of the extension arm.

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