A plastic tableware injection molding trimming device

Abstract

This utility model discloses a trimming device for injection molding of plastic tableware, comprising: a base with a tableware mold seat movably mounted on its top; a U-shaped bracket fixedly connected to the top of the base; a PLC controller fixedly installed on the right side of the top of the U-shaped bracket; an electric telescopic rod embedded and fixed on the inner wall of the top of the U-shaped bracket, and electrically connected to the PLC controller via a wire; and a U-shaped lifting plate fixedly connected to the extended end of the electric telescopic rod. This utility model, through a series of structures, facilitates trimming of the tableware by blowing high-temperature hot air around its edges without direct contact, thus achieving the advantages of no residue and no cleaning required. This avoids affecting subsequent hot-melting trimming operations, improves the deburring effect, and allows for easy replacement of the corresponding tableware mold seat and the inner shape-matching surrounding hot-blowing trimming mold assembly according to different tableware to be trimmed, improving applicability.

Description

Technical Field

[0001] This utility model relates to the field of plastic tableware processing technology, specifically to a plastic tableware injection molding trimming device. Background Technology

[0002] Plastic tableware refers to disposable utensils made of polymer materials through processes such as thermoforming and injection molding, intended for dining or similar purposes. For example, the edges of plates, dishes, knives and spoons are mostly rounded. The rounded shape is inconvenient for manual trimming, which can easily lead to over-trimming and cuts to the hands. Manual trimming can also easily leave cut marks on the edges, making the tableware unsightly.

[0003] Existing designs have improved the trimming device to address the above-mentioned defects. For example, document CN218227519U discloses a trimming device for injection molding of plastic tableware. In the above application, the burrs generated at the edge of the tableware are melted by electric heating and fused together with the tableware body to complete the trimming of the tableware. No knife is needed, making the trimming of tableware safer and greatly improving the trimming efficiency.

[0004] However, the above-mentioned equipment has the following problems in actual use: the edge of plastic tableware is trimmed by hot-melting the edges with electric heating. This method is prone to the melted parts of the edge sticking to the heating frame, which causes tearing and re-formation of burr residue when detached. It also leaves plastic residue on the inside of the heating frame, affecting reuse and reducing the deburring effect. In view of this, a plastic tableware injection molding trimming device is proposed to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of this invention is to provide a trimming device for injection molding of plastic tableware to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a trimming device for injection molding of plastic tableware, comprising:

[0007] The base has a movable clip at its top that holds a cutlery mold holder; the cutlery mold holder is designed to support cutlery to be trimmed.

[0008] The U-shaped bracket is fixedly connected to the top of the base;

[0009] The PLC controller is fixedly installed on the top right side of the U-shaped bracket;

[0010] The electric telescopic rod is embedded and fixed on the top inner wall of the U-shaped bracket and is electrically connected to the PLC controller via wires.

[0011] A U-shaped lifting plate is fixedly connected to the extended end of an electric telescopic rod. Rectangular guide sleeves that are slidably fitted onto the outside of a U-shaped bracket are fixedly connected to both sides of the U-shaped lifting plate. The electric telescopic rod is used to control the U-shaped lifting plate to move up and down under the control of a PLC controller.

[0012] The rubber support pillars consist of two sets and are fixedly connected to the top inner wall of the U-shaped lifting plate; the rubber support pillars are used to flexibly press and secure the tableware to be trimmed when the U-shaped lifting plate moves down.

[0013] The hot air supply assembly is installed on the U-shaped lifting plate and is electrically connected to the PLC controller;

[0014] The surrounding blowing heating trimming mold assembly is detachably connected to the bottom of two rectangular guide sleeves and is connected to the hot air supply assembly. The hot air supply assembly is controlled by the PLC controller to supply high-temperature air to the surrounding blowing heating trimming mold assembly. The surrounding blowing heating trimming mold assembly is used to blow high-temperature hot air to the outer edge of the tableware to be trimmed to melt the burrs and perform the trimming work.

[0015] The ranging component is fixedly connected between the top of the U-shaped lifting plate and the inner wall of the top of the U-shaped support, and is electrically connected to the PLC controller. The ranging component is used to measure the downward distance of the U-shaped lifting plate when it moves down and transmit the distance value to the PLC controller so that the PLC controller can accurately control the electric telescopic rod.

[0016] Preferably, the hot air supply assembly includes a hot air gun, a ventilation pipe, and rubber pads. The hot air gun is fixedly installed on the top left side of the U-shaped lifting plate. A ventilation slot is provided on the bottom left side of the U-shaped lifting plate. The ventilation pipe is connected to and fixed to the air outlet of the hot air gun. The bottom end of the ventilation pipe extends into the ventilation slot. There are two rubber pads, which are respectively glued and fixed to the bottom two sides of the U-shaped lifting plate. The top of the rubber pad on the left side has a connecting hole that communicates with the ventilation slot. The hot air gun and the PLC controller are electrically connected through wires.

[0017] Preferably, the surrounding heating trimming mold assembly includes a rectangular annular mold box and nozzles. The rectangular annular mold box is detachably connected to the bottom of two rectangular guide sleeves. An air inlet is provided on the top left side of the rectangular annular mold box, which is vertically aligned with and communicates with the ventilation groove. The top of the rectangular annular mold box is pressed tightly against the bottom of two rubber pads. The inner shape of the rectangular annular mold box matches the shape of the tableware. Multiple nozzles are connected and fixed to the inner side of the rectangular annular mold box at equal intervals. The shape formed by the inner side of the multiple nozzles matches the shape of the tableware. Both rubber support pillars are located inside the rectangular annular mold box.

[0018] Preferably, the ranging component includes a laser ranging sensor and a reference plate. The reference plate is fixedly connected to the top right side of the U-shaped lifting plate, the laser ranging sensor is located above the reference plate and fixedly connected to the top inner wall of the U-shaped bracket, and the laser ranging sensor is electrically connected to the PLC controller via wires.

[0019] Preferably, the top of the base is provided with a rectangular slot, and the bottom of the tableware mold base is fixedly connected with a rectangular block, which is movably fitted into the rectangular slot.

[0020] Preferably, the top left side of the U-shaped bracket has an avoidance hole, and the hot air gun is located inside the avoidance hole and does not contact the inner wall of the avoidance hole.

[0021] Preferably, the bottom of the rectangular annular mold box has two bolt holes on both sides, and the bottom of the rectangular guide sleeve has two threaded grooves. A knob-type bolt is screwed into the threaded groove, and the stud section of the knob-type bolt is movably inserted into the corresponding bolt hole.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] 1. By combining the base, tableware mold holder, U-shaped bracket, PLC controller, electric telescopic rod, U-shaped lifting plate, hot air supply component, surrounding blowing heating trimming mold component and distance measuring component, the trimming work can be carried out by surrounding the tableware and blowing high temperature hot air to melt the burrs without contacting the sides. This effectively avoids the phenomenon of easy adhesion and residue when electrothermal bonding is melted and easy tearing and re-formation of burr residue when detaching, thus avoiding affecting the re-melting trimming work and improving the deburring and trimming effect.

[0024] 2. The rectangular slots, rectangular blocks, knob-type bolts, and threaded grooves facilitate the subsequent disassembly and replacement of the corresponding tableware mold base and the inner-side heating trimming mold assembly according to different tableware to be trimmed, thereby improving applicability.

[0025] This utility model features a series of structures that facilitate trimming of tableware by blowing high-temperature hot air around its edges without direct contact, thus achieving the advantage of leaving no residue and eliminating the need for cleaning. This avoids affecting subsequent hot-melting trimming operations, improves the deburring and trimming effect, and allows personnel to easily disassemble and replace the corresponding tableware mold base and the inner shape-matched surrounding blowing heating trimming mold assembly according to different tableware to be trimmed, thereby improving applicability. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a plastic tableware injection molding trimming device proposed in this utility model;

[0027] Figure 2This is a schematic diagram of the front cross-sectional structure of a plastic tableware injection molding trimming device proposed in this utility model;

[0028] Figure 3 for Figure 2 A magnified structural diagram of part A in the diagram.

[0029] In the diagram: 1. Base; 2. Cutlery mold holder; 201. Rectangular block; 3. Rectangular ring mold box; 301. Nozzle; 302. Air inlet; 4. U-shaped bracket; 401. Rectangular guide sleeve; 402. Knob bolt; 5. PLC controller; 6. Electric telescopic rod; 7. U-shaped lifting plate; 701. Rubber support post; 8. Laser rangefinder sensor; 801. Reference plate; 9. Hot air gun; 901. Ventilation pipe; 902. Ventilation slot; 903. Rubber pad. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figures 1 to 3 As shown in this embodiment, a plastic tableware injection molding trimming device includes:

[0032] The base 1 has a tableware mold holder 2 mounted on its top; the tableware mold holder 2 is used to support the tableware to be trimmed.

[0033] U-shaped bracket 4 is fixedly connected to the top of base 1;

[0034] PLC controller 5 is fixedly installed on the top right side of U-shaped bracket 4;

[0035] The electric telescopic rod 6 is embedded and fixed on the top inner wall of the U-shaped bracket 4, and is electrically connected to the PLC controller 5 through wires;

[0036] The U-shaped lifting plate 7 is fixedly connected to the extended end of the electric telescopic rod 6. Both sides of the U-shaped lifting plate 7 are fixedly connected to rectangular guide sleeves 401 that are slidably sleeved on the outside of the U-shaped bracket 4. The electric telescopic rod 6 is used to drive the U-shaped lifting plate 7 to move up and down under the control of the PLC controller 5.

[0037] The rubber support pillars 701 are in two sets and are fixedly connected to the top inner wall of the U-shaped lifting plate 7; the rubber support pillars 701 are used to flexibly press and fix the tableware to be trimmed when the U-shaped lifting plate 7 moves down.

[0038] The hot air supply assembly is installed on the U-shaped lifting plate 7 and is electrically connected to the PLC controller 5;

[0039] The surrounding blowing heating trimming mold assembly is detachably connected to the bottom of two rectangular guide sleeves 401 and connected to the hot air supply assembly; the hot air supply assembly is controlled by the PLC controller 5 to supply high temperature air to the surrounding blowing heating trimming mold assembly, and the surrounding blowing heating trimming mold assembly is used to blow high temperature hot air to the outer edge of the tableware to be trimmed to melt the burrs for trimming work.

[0040] The ranging component is fixedly connected between the top of the U-shaped lifting plate 7 and the inner wall of the top of the U-shaped bracket 4, and is electrically connected to the PLC controller 5. The ranging component is used to measure the downward distance of the U-shaped lifting plate 7 when it moves down and transmit the distance value to the PLC controller 5 so that the PLC controller 5 can accurately control the operation of the electric telescopic rod 6.

[0041] In this embodiment, a rectangular slot is provided on the top of the base 1, and a rectangular block 201 is fixedly connected to the bottom of the tableware mold base 2. The rectangular block 201 is movably locked in the rectangular slot. The rectangular slot and the rectangular block 201 cooperate to achieve the effect of convenient locking and positioning of the tableware mold base 2. The locking connection method makes it convenient for personnel to replace the matching tableware mold base 2 with different tableware to be trimmed by easy plugging and unplugging, thereby improving applicability.

[0042] Furthermore, such as Figure 2 and 3 As shown, the hot air supply assembly includes a hot air gun 9, a ventilation pipe 901, and a rubber pad 903. The hot air gun 9 is fixedly installed on the top left side of the U-shaped lifting plate 7. A ventilation slot 902 is provided on the bottom left side of the U-shaped lifting plate 7. The ventilation pipe 901 is connected to and fixed to the air outlet of the hot air gun 9. The bottom end of the ventilation pipe 901 extends into the ventilation slot 902. There are two rubber pads 903, which are respectively glued and fixed on the bottom sides of the U-shaped lifting plate 7. The top of the rubber pad 903 on the left side is provided with a connecting hole that communicates with the ventilation slot 902. The hot air gun 9 is electrically connected to the PLC controller 5 through wires.

[0043] In this embodiment, a clearance hole is provided on the top left side of the U-shaped bracket 4. The hot air gun 9 is located inside the clearance hole and does not contact the inner wall of the clearance hole, which achieves the effect of avoiding collisions for the hot air gun 9.

[0044] In this embodiment, the hot air gun 9, the ventilation pipe 901 and the rubber pad 903 work together to supply high-temperature hot air into the ventilation slot 902 through the ventilation pipe 901 when the hot air gun 9 is turned on.

[0045] Furthermore, such as Figure 2 and 3As shown, the surrounding blowing heating trimming mold assembly includes a rectangular annular mold box 3 and a nozzle 301. The rectangular annular mold box 3 is detachably connected to the bottom of two rectangular guide sleeves 401. An air inlet 302 is provided on the top left side of the rectangular annular mold box 3, which is vertically aligned with and communicates with the ventilation groove 902. The top of the rectangular annular mold box 3 is pressed tightly against the bottom of two rubber pads 903. The inner shape of the rectangular annular mold box 3 matches the shape of the tableware. There are multiple nozzles 301 that are connected and fixed at equal intervals on the inner side of the rectangular annular mold box 3. The shape formed by the inner side of the multiple nozzles 301 matches the shape of the tableware. Both rubber support pillars 701 are located on the inner side of the rectangular annular mold box 3.

[0046] In this embodiment, two bolt holes are provided on both sides of the bottom of the rectangular ring mold box 3, and two threaded grooves are provided on the bottom of the rectangular guide sleeve 401. A knob bolt 402 is screwed into the threaded groove, and the stud section of the knob bolt 402 is movably inserted into the corresponding bolt hole. The bottom inner wall of the knob bolt 402 is in tight contact with the bottom of the rectangular ring mold box 3. The knob bolt 402 and the threaded groove are used to install, fix and unlock the rectangular ring mold box 3. The detachable nature of the rectangular ring mold box 3 makes it convenient for personnel to replace the inner shape of the surrounding blowing heating trimming mold assembly with a matching shape according to different tableware to be trimmed, thereby improving applicability.

[0047] In this embodiment, the rectangular ring mold box 3, the nozzle 301 and the air inlet 302 work together to supply high-temperature hot air into the ventilation slot 902. The high-temperature hot air enters the rectangular ring mold box 3 through the air inlet 302, and then blows high-temperature hot air around the outer edge of the tableware to be trimmed in a surrounding manner through multiple nozzles 301 to melt the burrs and perform the tableware trimming work.

[0048] Furthermore, such as Figure 2 As shown, the ranging assembly includes a laser ranging sensor 8 and a reference plate 801. The reference plate 801 is fixedly connected to the top right side of the U-shaped lifting plate 7. The laser ranging sensor 8 is located above the reference plate 801 and is fixedly connected to the top inner wall of the U-shaped bracket 4. The laser ranging sensor 8 is electrically connected to the PLC controller 5 through wires.

[0049] In this implementation scheme, the laser rangefinder 8 and the reference plate 801 work together to move the reference plate 801 down as the U-shaped lifting plate 7 moves down. The laser rangefinder 8 detects the distance between itself and the reference plate 801 in real time and transmits the distance value to the PLC controller 5. The PLC controller 5 then accurately and automatically controls the closing of the electric telescopic rod 6 according to the preset distance value of different tableware, so that the nozzle 301 is accurately aligned with the side of the tableware to be trimmed and performs precise heat-melting trimming.

[0050] It should be noted that the laser rangefinder 8, the hot air gun 9, and the electric telescopic rod 6 are electrically connected to the PLC controller 5 via wires. This direct wire connection, allowing the PLC controller 5 to control the electrical connection, is a well-known and conventional method of wired control, and will not be elaborated further here. The PLC controller 5 is preferably a Keyence KV-N14AT programmable controller, and the hot air gun 9 is preferably an SDL-J7500D commercially available Jingxinda industrial-grade hot air gun with PLC communication control functionality. Programmers can pre-program the downward movement distance of the electric telescopic rod 6 using the PLC controller 5, and set the start time of the hot air gun 9 after reaching the downward movement distance based on the deburring time required for different plastic tableware edges. This allows for precise displacement drive and precise control of heating time, a well-known programming numerical control method in the field, and will not be described in detail here.

[0051] The usage method of this embodiment is as follows: When using the plastic tableware injection molding trimming device, place the tableware to be trimmed on top of the tableware mold base 2. Pre-set the closing distance of the electric telescopic rod 6 using the PLC controller 5 according to the distance between different tableware and the nozzle 301. Based on the pre-measured time required for the high-temperature hot air blown from the nozzle 301 to melt the burrs when the hot air gun 9 is activated, pre-set the activation time of the hot air gun 9 when the set distance is reached using the PLC controller 5. The operator then operates the PLC controller 5 to turn it on. First, control the electric telescopic rod 6 to start forward, causing it to drive the U-shaped lifting plate 7 to move downward. The U-shaped lifting plate 7 drives the two rectangular guide sleeves 401 to slide downward on the U-shaped bracket 4, performing vertical guiding work. The U-shaped lifting plate 7 drives the rectangular ring mold box 3, the rubber support column 701, and the reference plate 801 to move downward. The rubber support column 701 presses down on the top of the tableware to be trimmed, and under the extrusion pressure, it self-shrinks due to the flexibility of rubber. The laser distance sensor 8 detects the distance between itself and the reference plate 801 in real time and transmits the distance value to the PLC controller 5. When the preset distance value is reached, the rectangular ring mold box 3 moves the nozzle 301 downwards to align laterally with the edge of the tableware to be trimmed. At this time, the PLC controller 5 controls the electric telescopic rod 6 to close and the hot air gun 9 to open. The hot air gun 9 supplies high-temperature hot air into the ventilation slot 902 through the ventilation pipe 901. The high-temperature hot air then enters the rectangular ring mold box 3 through the air inlet 302, and is then blown by multiple nozzles 301 in a surrounding manner to melt the burrs and trim the tableware. When the set time for blowing high-temperature hot air is reached, The PLC controller 5 controls the hot air gun 9 to turn off and controls the electric telescopic rod 6 to start in reverse. The electric telescopic rod 6 drives the U-shaped lifting plate 7 and the rectangular ring mold box 3 to rise and reset, so that the tableware can be removed and replaced for hot melting deburring and trimming. By surrounding the tableware and blowing high-temperature hot air to melt the burrs without contacting the edges, the trimming method effectively avoids the phenomenon of easy adhesion and residue when the electric heating is applied and hot melting, and the phenomenon of tearing and re-forming burr residue when detaching. This avoids affecting the hot melting and trimming work again, and has the advantages of no residue and no cleaning, thus improving the deburring and trimming effect.

[0052] In addition, the rectangular ring mold box 3 is fixed by using a knob-type bolt 402 in conjunction with a threaded groove. Subsequently, the knob-type bolt 402 can be rotated in the opposite direction to separate it from the threaded groove, thereby releasing the fixation of the rectangular ring mold box 3 and facilitating disassembly of the rectangular ring mold box 3. The rectangular slot and rectangular block 201 are used to conveniently lock and position the tableware mold seat 2, which also facilitates easy disassembly and replacement of the tableware mold seat 2 by personnel through easy plugging and unplugging. The tableware mold seat 2 and the surrounding blowing heating trimming mold assembly are detachable, which makes it convenient for personnel to disassemble and replace the corresponding tableware mold seat 2 and surrounding blowing heating trimming mold assembly according to different tableware to be trimmed, thereby improving applicability.

[0053] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A trimming device for injection molding of plastic tableware, comprising a base (1), characterized in that: include: The base (1) has a tableware mold holder (2) mounted on its top movable clip; U-shaped bracket (4) is fixedly connected to the top of base (1); The PLC controller (5) is fixedly installed on the top right side of the U-shaped bracket (4); The electric telescopic rod (6) is embedded and fixed on the top inner wall of the U-shaped bracket (4) and electrically connected to the PLC controller (5) through a wire; The U-shaped lifting plate (7) is fixedly connected to the extended end of the electric telescopic rod (6). Both sides of the U-shaped lifting plate (7) are fixedly connected to rectangular guide sleeves (401) that are slidably sleeved on the outside of the U-shaped bracket (4). Rubber support pillars (701) are in two sets and are fixedly connected to the top inner wall of the U-shaped lifting plate (7); The hot air supply assembly is installed on the U-shaped lifting plate (7) and electrically connected to the PLC controller (5); The surrounding blow heating trimming mold assembly is detachably connected to the bottom of two rectangular guide sleeves (401) and communicates with the hot air supply assembly; The ranging component is fixedly connected between the top of the U-shaped lifting plate (7) and the inner wall of the top of the U-shaped bracket (4), and is electrically connected to the PLC controller (5).

2. The plastic tableware injection molding trimming device according to claim 1, characterized in that: The hot air supply assembly includes a hot air gun (9), a ventilation pipe (901), and a rubber pad (903). The hot air gun (9) is fixedly installed on the top left side of the U-shaped lifting plate (7). A ventilation slot (902) is provided on the bottom left side of the U-shaped lifting plate (7). The ventilation pipe (901) is connected to the air outlet of the hot air gun (9). The bottom end of the ventilation pipe (901) extends into the ventilation slot (902). There are two rubber pads (903), which are respectively glued and fixed on the bottom sides of the U-shaped lifting plate (7). The top of the rubber pad (903) on the left side is provided with a connecting hole that communicates with the ventilation slot (902). The hot air gun (9) is electrically connected to the PLC controller (5) through a wire.

3. The plastic tableware injection molding trimming device according to claim 2, characterized in that: The surrounding heating trimming mold assembly includes a rectangular ring mold box (3) and a blow nozzle (301). The rectangular ring mold box (3) is detachably connected to the bottom of two rectangular guide sleeves (401). An air inlet (302) is provided on the top left side of the rectangular ring mold box (3) and is vertically aligned with the ventilation groove (902). The top of the rectangular ring mold box (3) is pressed tightly against the bottom of two rubber pads (903). The inner shape of the rectangular ring mold box (3) matches the shape of the tableware. There are multiple blow nozzles (301) that are connected and fixed at equal intervals on the inner side of the rectangular ring mold box (3). The shape formed by the inner side of the multiple blow nozzles (301) matches the shape of the tableware. Two rubber support pillars (701) are located on the inner side of the rectangular ring mold box (3).

4. The plastic tableware injection molding trimming device according to claim 1, characterized in that: The ranging assembly includes a laser ranging sensor (8) and a reference plate (801). The reference plate (801) is fixedly connected to the top right side of the U-shaped lifting plate (7). The laser ranging sensor (8) is located above the reference plate (801) and is fixedly connected to the top inner wall of the U-shaped bracket (4). The laser ranging sensor (8) is electrically connected to the PLC controller (5) through wires.

5. The plastic tableware injection molding trimming device according to claim 1, characterized in that: The top of the base (1) is provided with a rectangular slot, and the bottom of the tableware mold base (2) is fixedly connected with a rectangular card block (201), which is movably installed in the rectangular slot.

6. The plastic tableware injection molding trimming device according to claim 2, characterized in that: The top left side of the U-shaped bracket (4) has an avoidance hole, and the hot air gun (9) is located inside the avoidance hole and does not contact the inner wall of the avoidance hole.

7. The plastic tableware injection molding trimming device according to claim 3, characterized in that: The rectangular ring mold box (3) has two bolt holes on both sides of its bottom. The bottom of the rectangular guide sleeve (401) has two threaded grooves. A knob bolt (402) is screwed into the threaded groove. The stud section of the knob bolt (402) is movably inserted into the corresponding bolt hole.

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