Secondary crystallization device of extrusion straw

Abstract

The invention belongs to the technical field of equipment for producing plastic straws, and particularly relates to a secondary crystallization device for extruding straws. According to the secondary crystallization device for extruding the straw, the mounting hole, the material frame, the air inlet pipe, the electric heaters and the conveying belt are arranged on the heating cavity channel, so that 1, the plurality of electric heaters can provide a partitioned heating effect, and the secondary crystallization operation is more flexible and efficient; and 2, the material frame and the air inlet pipe are matched for use, so that the suction pipe in the material frame can obtain a more efficient air cooling shaping effect, and the secondary crystallization effect of the extruded suction pipe is also facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of equipment for producing plastic straws, and in particular relates to a secondary crystallization device for extruded straws. Background Art

[0002] Common straws are generally produced by extrusion, and can be divided into the following three types according to the material: ordinary plastic straws, degradable plastic straws, and paper straws. Among them, the material of degradable plastic straws is generally PLA, that is, polylactic acid, which comes from corn, cassava, etc., and is an environmentally friendly material.

[0003] On the other hand, in the existing process, PLA extruded straws can obtain high temperature resistance similar to that of ordinary plastic straws through a secondary crystallization method, for example, the high temperature resistance can reach at least 100°C, and the above-mentioned secondary crystallization device is used in the secondary crystallization method.

[0004] The existing secondary crystallization device mainly includes: a conveyor belt, a hot air pipe, and a cover. The straws that have completed the first crystallization and preliminary shaping can be slowly passed under the cover to complete the secondary crystallization operation. The straw products output at the unloading end of the conveyor belt can obtain relatively high temperature resistance and meet the needs of hot drink use.

[0005] For example, the Chinese utility model patent with authorization announcement number CN220995512U and authorization announcement date 2024.05.24 discloses a shaping and crystallization machine for processing degradable drinking straws. The structure includes a frame, a heating conveyor belt, a mounting plate, a control panel, an air intake duct, a guide plate, a shaping conveyor belt, a drive motor, an air uniforming mechanism, and a lifting mechanism.

[0006] The shaping crystallization machine in this utility model patent has the following general advantages: it overcomes the problem that the existing biodegradable straws cannot evenly spray gas on the straws during the secondary crystallization process, resulting in poor straw shaping effect; and the current situation that most existing straw shaping devices can only be used for biodegradable straws of one size and have poor effect in rounding the straws.

[0007] However, in actual use, the shaping crystallizer still has at least the following two shortcomings, which are also the technical problems to be solved by the present invention, namely: First, the front end of the shaping conveyor belt structure in the conveying direction can only provide a relatively low-intensity natural cooling effect for the straws. It takes a long time for the straws to recover from the high temperature state to the room temperature state, which is not conducive to the secondary crystallization molding quality of the straws and will definitely reduce the production efficiency of the straws. Second, the air homogenizing mechanism can only provide a fixed-intensity, non-adjustable heating effect to the moving straw, which is also not conducive to the secondary crystallization effect of the straw.

[0008] Therefore, in summary, there is an urgent need for a new type of heating device with zoned heating and air cooling to be used for secondary crystallization operation of extruded straws. Summary of the invention

[0009] The present invention provides a secondary crystallization device for extruded straws, which can be configured with mounting holes, a material frame, an air inlet pipe, an electric heater, and a conveyor belt on a heating cavity, so that: 1. a plurality of electric heaters can provide a zoned heating effect, making the secondary crystallization operation more flexible and efficient; 2. the material frame and the air inlet pipe are used in combination, so that the straws in the material frame can obtain a more efficient air-cooling shaping effect, which is also beneficial to the secondary crystallization effect of the extruded straws.

[0010] The technical solution adopted by the present invention to solve the above-mentioned problem is: a secondary crystallization device for extruded straws, the structure of which includes an electric heater and a conveyor belt, and also includes a heating cavity sleeved with the conveyor belt, a plurality of plug-in holes arranged on the top plate of the heating cavity and used to install the electric heater, a material frame arranged at a position below the heating cavity and used to receive the straws, and an air inlet pipe arranged on the material frame and used to blow air to cool the straws.

[0011] A further preferred technical solution is that the number of the plug-in jacks and the number of the electric heaters are both 3, the electric heaters are arranged sequentially in the conveying direction of the conveyor belt, the length of the heating cavity is 10-14m, and the temperature in the heating cavity is 90-100°C.

[0012] A further preferred technical solution is that an L-shaped guide rail for installing the material frame is also provided on the lower surface of the heating chamber, and a mounting hole for plugging into the L-shaped guide rail is also provided on the end plate of the material frame that engages with the lower surface of the heating chamber, and a dual-purpose inclined plate for guiding and covering the material is also provided on the other end plate of the material frame.

[0013] A further preferred technical solution is that: before the material frame moves close to the heating chamber, the dual-purpose inclined plate for guiding and sealing is used to guide the falling straw into the material frame; after the material frame moves close to the heating chamber, the dual-purpose inclined plate for guiding and sealing is used to seal the material frame by engaging with the lower edge of the material outlet of the heating chamber.

[0014] A further preferred technical solution is that a heightening plate is further provided on the end plate of the material frame, which is used to form an air outlet by raising the height of the higher end of the dual-purpose inclined plate for guiding and sealing.

[0015] A further preferred technical solution is that: the heightened plate is further provided with a positioning hole, and an auxiliary guide rail inserted in the positioning hole.

[0016] A further preferred technical solution is that: a discharge port is further provided on the bottom plate of the material frame, and an elastic plate with one end arranged on the discharge port.

[0017] A further preferred technical solution is that a discharging lifting rod is provided on the lower surface of the dual-purpose guiding and sealing inclined plate, which is squeezed through the lower edge of the discharging port and then extends downward to bend the elastic plate downward.

[0018] A further preferred technical solution is that the auxiliary guide rail is also provided with an elastic rope for connecting the lower end of the dual-purpose inclined plate for guiding and covering, and an adjustable sleeve ring for installing the elastic rope.

[0019] A further preferred technical solution is that the number of the auxiliary guide rails and the number of the elastic ropes are both two, and the two elastic ropes are respectively arranged at two side positions on the upper surface of the dual-purpose inclined plate for guiding and sealing the material, so as to block the straw from falling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 It is a schematic diagram of the position of the plug-in jack in the present invention from a top view.

[0022] Figure 3 Schematic diagram of the position and shape of the L-shaped guide rail and the auxiliary guide rail in the present invention.

[0023] Figure 4 It is a schematic diagram of the position and shape of the dual-purpose inclined plate for guiding and covering in the present invention.

[0024] Figure 5 Schematic diagram of the position of the elastic rope in the present invention from a top view.

[0025] Figure 6 This is a schematic diagram of the use of the dual-purpose inclined plate for guiding and covering the material frame in the present invention.

[0026] Figure 7 This is a schematic diagram of the use of the dual-purpose inclined plate for guiding and covering materials for indirect material discharge in the present invention.

[0027] Figure 8 It is a schematic diagram of an installation method of the electric heater in the present invention from a top view.

[0028] In the figure, the meanings of the symbols are as follows: Straw a; Blowing direction b; Electric heater 31, conveyor belt 32; Heating cavity 1, plug-in hole 2, material frame 3, air inlet pipe 4, L-shaped guide rail 5, mounting hole 6, dual-purpose inclined plate for guiding and covering 7, heightening plate 8, positioning hole 9, auxiliary guide rail 10, discharge port 11, elastic plate 12, lifting rod for discharge 13, elastic rope 14, adjustable sleeve ring 15, vertical plate 16, cylinder hole 17, bottom plate 18, cavity fracture 19, wire hole 20, rectangular frame 21, plug-in rod 22, and adjusting nut 23; The lower edge of the discharge port is 1-1. DETAILED DESCRIPTION

[0029] The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention.

[0030] As attached Figure 1-Figure 8 As shown, a secondary crystallization device for extruded straws comprises an electric heater 31 and a conveyor belt 32, a heating chamber 1 sleeved with the conveyor belt 32, a plurality of plug-in holes 2 arranged on the top plate of the heating chamber 1 and used for mounting the electric heater 31, a material frame 3 arranged at a position below the heating chamber 1 and used for receiving the straws a, and an air inlet pipe 4 arranged on the material frame 3 and used for blowing air to cool the straws a.

[0031] In this embodiment, the straw a that has completed the first crystallization and has been shaped enters from one end of the heating chamber 1, and the electric heater 31 is turned on, and the heating operation is appropriately performed. Finally, it falls out from the other end of the heating chamber 1, and the basic secondary crystallization operation has been completed. At this time, the straw a already has relatively outstanding high temperature resistance.

[0032] A plurality of the plug-in holes 2 correspond to the same number of the electric heaters 31, so that the straws a can successively obtain flexible heating effects in the conveying direction: adjustable temperature and adjustable duration of each stage corresponding to different temperatures, which is beneficial to improving the secondary crystallization quality of the straws.

[0033] The material frame 3 is provided with the air inlet pipe 4, which is connected to the existing blower, so that after the straw a completes the multi-stage heating, a high-intensity air cooling effect can be immediately obtained, which can also improve the quality and operation efficiency of the secondary crystallization.

[0034] The heating cavity 1 and the conveyor belt 32 are both fixedly installed, and the electric heater 31 can adjust its own heating intensity and the installation height on the plug-in hole 2. Generally, when the above-mentioned zone heating method needs to form a relatively high temperature zone, the heating power of the electric heater 31 can be increased and / or appropriately lowered so that the electric heater 31 is closer to the moving straw a.

[0035] The number of the plug-in jacks 2 and the number of the electric heaters 31 are both 3. The electric heaters 31 are arranged in sequence in the conveying direction of the conveyor belt 32. The length of the heating cavity 1 is 10-14m, and the temperature in the heating cavity 1 is 90-100°C.

[0036] In the forward direction of the conveyor belt in this embodiment, the three heating areas formed by the three electric heaters 31 are respectively: a medium temperature preparation area, a high temperature secondary crystallization area, and a low temperature extension area. For example, the temperature of the area 2 cm below the lower surface of each of the three electric heaters 31 is respectively: 93-95°C, 98-99°C, and 90-92°C.

[0037] Among them, the distance between the two side electric heaters 31 and the end surface of the heating chamber 1 is 2-4m, while the central electric heater 31 is located at the center of the heating chamber 1, and the distance between the upper surface of the conveyor belt 32 and the lower surface of the electric heater 31 is 2-6cm.

[0038] Finally, the straw a that has completed sufficient air blowing and cooling operation in the material frame 3 has a high temperature resistance of ≥100° C., which fully meets the needs of hot drink use.

[0039] An L-shaped guide rail 5 for mounting the material frame 3 is also provided on the lower surface of the heating chamber 1, and a mounting hole 6 for plugging the L-shaped guide rail 5 is also provided on the end plate of the material frame 3 that engages with the lower surface of the heating chamber 1, and a dual-purpose inclined plate 7 for guiding and covering is also provided on the other end plate of the material frame 3.

[0040] In this embodiment, the secondary crystallization device further comprises: a vertical plate 16, a cylinder hole 17, and a bottom plate 18. Figure 3 As shown, there are three vertical plates 16 , two of which are used to support and install the heating chamber 1 , and the last one is used to install the material frame 3 .

[0041] At this time, the upper surface of the material frame 3 always fits the lower surface of the heating chamber 1, and the L-shaped guide rail 5 is plugged into the mounting hole 6, and the cylinder hole 17 is installed with an existing common cylinder for pushing and pulling the material frame 3. At this point, the material frame 3 can slide horizontally smoothly, providing a structural basis for the subsequent functions of the secondary crystallization device.

[0042] The word "material guiding" on the dual-purpose material guiding and sealing inclined plate 7 means that: its end close to the heating chamber 1 is inclined downward, so that even if a straw a accidentally falls on it, it can roll down and enter the material frame 3, ensuring that the air cooling operation of the straw after the secondary crystallization is comprehensive enough and no straw will be missed.

[0043] The word "cover" means that the position is generally located at the upward opening of the material frame 3, and the opening is properly covered, so that the airflow entering the air inlet pipe 4 will not "turn" upward and flow out immediately in large quantities, but will blow on the suction pipe a as much as possible and then flow out on the other side, which can greatly improve the air cooling effect. The blowing direction b can refer to the attached Figure 6 .

[0044] Before the material frame 3 moves close to the heating chamber 1, the dual-purpose inclined plate 7 for guiding and sealing is used to guide the falling straw a into the material frame 3; after the material frame 3 moves close to the heating chamber 1, the dual-purpose inclined plate 7 for guiding and sealing is used to seal the material frame 3 by engaging with the lower edge 1-1 of the discharge port of the heating chamber 1.

[0045] In this embodiment, the first function of the dual-purpose inclined plate 7 for guiding and sealing, i.e., "guiding", can be referred to in the attached Figure 4 , and the second function mentioned above, namely "capping", can be referred to in the attached Figure 6 .

[0046] What is more crucial is that the material frame 3 can slide together with the material guiding and sealing dual-purpose inclined plate 7, so that the material frame 3 is fully filled with sufficient and appropriate straws a, and after the air inlet pipe 4 is opened, the material guiding and sealing dual-purpose inclined plate 7 can be close to the lower edge 1-1 of the discharge port, so that the material guiding and sealing dual-purpose inclined plate 7 and part of the bottom plate of the heating chamber 1 can properly cover the material frame 3 together, ensuring that the air-cooling airflow is blown through the straws a as much as possible before being discharged outward, thereby improving the efficiency of the air-cooling operation.

[0047] Among them, the following points need to be specially mentioned: First, the air cooling operation of the secondary crystallization device is preferably performed in an intermittent manner, that is, after a sufficient amount of straws a are accumulated in the material frame 3, the material frame 3 slides by itself, and the material guide and cover dual-purpose inclined plate 7 covers the material frame 3, and finally the intermittent air cooling operation is completed at the air inlet pipe 4. At this time, the subsequent falling straws a can be temporarily stored on the upper surface of the material guide and cover dual-purpose inclined plate 7 as the next batch of objects to be air-cooled. Therefore, the intermittent air cooling operation does not affect the continuous unloading and continuous secondary crystallization of the conveyor belt 32; Second, the device can also be operated with continuous air cooling, that is, the air inlet pipe 4 is continuously opened, and the lateral movable feature of the material frame 3 can be used to adjust the distance between the bottom edge of the heating cavity 1 and the material guiding and sealing dual-purpose inclined plate 7, so that the two can both cover the material frame 3 as much as possible and ensure that each straw a can fall between the two; Third, in order to improve the sealing effect of the material frame 3 composed of the bottom edge of the heating cavity 1 and the dual-purpose inclined plate 7 for guiding and sealing, the lower edge 1-1 of the material outlet needs to abut against the upper surface of the dual-purpose inclined plate 7 for guiding and sealing, which requires that the dual-purpose inclined plate 7 for guiding and sealing is partially located above the upper end surface of the material frame 3. For details, please refer to the attached Figure 4 .

[0048] The end plate of the material frame 3 is also provided with a heightening plate 8 for forming an air outlet by raising the height of the higher end of the dual-purpose material guiding and sealing inclined plate 7.

[0049] In this embodiment, the first function of the heightened plate 8 is to provide a feasible solution to the requirement that "the material guiding and sealing dual-purpose inclined plate 7 is partially located above the upper end surface of the material frame 3". At this time, the end of the material guiding and sealing dual-purpose inclined plate 7 that is relatively far away from the heating channel 1 is the higher end, which is higher than the upper end surface of the material frame 3.

[0050] Correspondingly, at this time, the area with a right-angled triangle vertical cross-section left between the lower surface of the dual-purpose inclined plate 7 for guiding and sealing and the upper surface of the material frame 3 is the air outlet of the material frame 3, which is arranged on the left and right and on the top and bottom of the air inlet pipe 4 to ensure that the air-cooling airflow can pass through most of the area in the material frame 3, so that the air-cooling efficiency is higher. For details, please refer to the attached Figure 6 .

[0051] The heightening plate 8 is also provided with a positioning hole 9 and an auxiliary guide rail 10 inserted in the positioning hole 9 .

[0052] In this embodiment, the auxiliary guide rail 10 and the cylinder hole 17 are arranged together in the adjacent Figure 3 On the right side vertical plate 16 in the middle, the left and right movement of the material frame 3 is made more stable.

[0053] On the other hand, the second function of the heightened plate 8 is to be used for inserting and installing the auxiliary guide rail 10, so that the positioning hole 9 originally required to be opened on the material frame 3 can be set thereon, avoiding the problem of the auxiliary guide rail 10 originally required to be inserted into the material frame 3 accidentally damaging the straw a.

[0054] The bottom plate of the material frame 3 is also provided with a material outlet 11 and an elastic plate 12 which is arranged on the material outlet 11 at one end.

[0055] In this embodiment, the shape of the discharge port 11 and the elastic plate 12 are both rectangular, and one wide side of the latter is fixedly arranged on the discharge port 11, so that after the elastic plate 12 is pressed and bent downward, the position of the other wide side thereof can smoothly drop the straw a that has completed the air cooling operation. For details, please refer to the attached Figure 7 .

[0056] The elastic plate 12 is made of ordinary rubber, and one end of the elastic plate 12 is bent downward to discharge the material through a straw, which can be achieved by, for example, providing a pull-down handle on its lower surface.

[0057] A discharging lifting rod 13 is also provided on the lower surface of the dual-purpose guiding and sealing inclined plate 7, which is squeezed through the lower edge 1-1 of the discharging port and then extends downward to be used for bending the elastic plate 12 downward.

[0058] In this embodiment, the direct function of the ejection rod 13 is to replace the pull-down handle, so that the lower edge 1-1 of the discharge port can bend the dual-purpose inclined plate 7 downward directly and the elastic plate 12 downward indirectly after being attached to the upper surface of the dual-purpose inclined plate 7 for guiding and sealing, and finally complete the straw discharge operation. This also makes the movable feature of the material frame 3 and the downward bending and deformation feature of the dual-purpose inclined plate 7 for guiding and sealing more convenient to use.

[0059] The fixed ends of the elastic plate 12 and the dual-purpose inclined plate 7 for guiding and sealing are located on the same side, which is relatively far from the heating chamber 1. The number of the ejection rods 13 is 1-2, even if the straw a is moved to the adjacent Figure 7 The right side of the ejection rod 13 can also be used to eject the material after the elastic plate 12 is bent and deformed downward, and it is not easy to leave a straw in the material frame 3.

[0060] The auxiliary guide rail 10 is also provided with an elastic rope 14 for connecting the lower end of the dual-purpose inclined plate 7 for guiding and sealing, and an adjustable sleeve ring 15 for installing the elastic rope 14 .

[0061] In this embodiment, one end of the elastic rope 14 is fixedly connected to the non-installation end of the dual-purpose inclined plate 7 for guiding and sealing, and the other end thereof is connected to the adjustable sleeve ring 15, and the adjustable sleeve ring 15 and the auxiliary guide rail 10 can be either screwed or elastically clamped, so that the dual-purpose inclined plate 7 for guiding and sealing can obtain supplementary elasticity after being bent multiple times and its elasticity decreases, that is, when it needs to fit the lower edge 1-1 of the discharge port, it can be fully fit and clamped to avoid a large amount of air leakage at this location.

[0062] The number of the auxiliary guide rails 10 and the number of the elastic ropes 14 are both two, and the two elastic ropes 14 are respectively arranged at two sides of the upper surface of the dual-purpose inclined plate 7 for guiding and covering the material, so as to block and prevent the straw a from falling.

[0063] In this embodiment, the electric heater 31 is centrally arranged with the radiant heating surface facing downwards, and is installed on the rectangular frame 21. Therefore, the plug-in hole 2 and the wire hole 20 are respectively located on both sides of the central axis of the conveyor belt in the width direction, ensuring that the rectangular frame 21 can be stably and height-adjustably installed on the heating channel 1 through the plug-in rod 22 and the adjusting nut 23.

[0064] On the other hand, the role of the cavity break 19 is to make the central electric heater 31, like the side electric heaters 31, easy to replace and repair. Figure 2 As shown, the left section of the heating chamber 1 is screwed to the vertical plate 16, while the right section can be welded to another vertical plate 16. Finally, between the two sections, a common high-temperature resistant rubber sealing ring can be arranged to ensure a relatively efficient heating effect for secondary crystallization of the straw.

[0065] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various modifications can be made within the knowledge of ordinary technicians in the technical field without departing from the purpose of the present invention. These are all non-creative modifications and are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A secondary crystallization device for extruded straws, comprising an electric heater (31) and a conveyor belt (32), characterized in that: It also includes a heating cavity (1) sleeved with the conveyor belt (32), a plurality of plug-in holes (2) arranged on the top plate of the heating cavity (1) and used to install the electric heater (31), a material frame (3) arranged at a position below the heating cavity (1) and used to receive the straw (a), and an air inlet pipe (4) arranged on the material frame (3) and used to blow air to cool the straw (a).

2. The secondary crystallization device for extruded straws according to claim 1, characterized in that: The number of the plug-in and unplugging jacks (2) and the number of the electric heaters (31) are both three; the electric heaters (31) are arranged in sequence in the conveying direction of the conveyor belt (32); the length of the heating cavity (1) is 10-14 m; and the temperature in the heating cavity (1) is 90-100° C.

3. The secondary crystallization device for extruded straws according to claim 1, characterized in that: An L-shaped guide rail (5) for mounting the material frame (3) is also provided on the lower surface of the heating cavity (1); a mounting hole (6) for plugging into the L-shaped guide rail (5) is also provided on the end plate of the material frame (3) that engages with the lower surface of the heating cavity (1); and a dual-purpose inclined plate (7) for guiding and sealing is also provided on the other end plate of the material frame (3).

4. The secondary crystallization device for extruded straws according to claim 3, characterized in that: Before the material frame (3) moves close to the heating chamber (1), the dual-purpose inclined plate (7) for guiding and sealing is used to guide the falling straw (a) into the material frame (3); after the material frame (3) moves close to the heating chamber (1), the dual-purpose inclined plate (7) for guiding and sealing is used to seal the material frame (3) by engaging with the lower edge (1-1) of the material outlet of the heating chamber (1).

5. The secondary crystallization device for extruded straws according to claim 3, characterized in that: The end plate of the material frame (3) is also provided with a heightening plate (8) for forming an air outlet by raising the height of the higher end of the dual-purpose material guiding and sealing inclined plate (7).

6. The secondary crystallization device for extruded straws according to claim 5, characterized in that: The heightened plate (8) is also provided with a positioning hole (9) and an auxiliary guide rail (10) inserted into the positioning hole (9).

7. The secondary crystallization device for extruded straws according to claim 4, characterized in that: The bottom plate of the material frame (3) is also provided with a material outlet (11), and an elastic plate (12) arranged at one end on the material outlet (11).

8. The secondary crystallization device for extruded straws according to claim 7, characterized in that: The lower surface of the dual-purpose guiding and sealing inclined plate (7) is also provided with a discharge lifting rod (13) which is extended downward after being squeezed by the lower edge (1-1) of the discharge port and is used to bend the elastic plate (12) downward.

9. The secondary crystallization device for extruded straws according to claim 6, characterized in that: The auxiliary guide rail (10) is also provided with an elastic rope (14) for connecting the lower end of the dual-purpose material guiding and sealing inclined plate (7), and an adjustable sleeve ring (15) for installing the elastic rope (14).

10. The secondary crystallization device for extruded straws according to claim 6, characterized in that: The number of the auxiliary guide rails (10) and the number of the elastic ropes (14) are both two, and the two elastic ropes (14) are respectively arranged at two sides of the upper surface of the dual-purpose inclined plate (7) for guiding and sealing the material, so as to perform a blocking and anti-dropping operation on the straw (a).

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