Injection molding machine with replaceable plastic waste recycling pipe

Abstract

The application relates to a plastic waste recycling based injection molding machine with replaceable material pipe, which comprises a base, a slide rail arranged on the base, a reciprocating movable machine seat arranged on the slide rail, a material bucket fixedly arranged on the machine seat, an injection molding die arranged on one side of the base, a second inlet and a second outlet arranged on the material bucket, the injection molding die being provided with an injection molding feeding port, the first outlet being opposite to the injection molding feeding port, the first inlet being opposite to the second outlet, a first positioning device for assisting the installation of the material pipe on the machine seat being arranged on the machine seat, and a second positioning device for assisting the connection of the motor and the spiral feeding rod being arranged on the machine seat. The cooperation of the first positioning assembly and the second positioning assembly can assist the centering and clamping of the material pipe when the new material pipe is replaced, so that the installation time can be reduced and the work efficiency can be improved.

Description

An injection molding machine with an easy-to-change feed tube based on plastic waste recycling Technical Field

[0001] This invention relates to the field of injection molding machine technology, and more specifically to an injection molding machine based on the recycling of plastic waste that facilitates the replacement of the feed tube. Background Technology

[0002] With the widespread use of plastic products, the recycling and reuse of plastic waste has become an important issue for environmental protection and resource recycling. During the plastic recycling process, different types of plastic materials (such as polyethylene, polypropylene, and polystyrene) differ in their melting temperature, rheological properties, and chemical properties. Mixing them during processing can easily lead to a decline in the quality of injection-molded products or even production failure. Therefore, when using an injection molding machine to process different types of recycled plastics, it is usually necessary to replace or thoroughly clean the injection molding machine's feed tube to avoid cross-contamination.

[0003] Current injection molding machines typically feature detachable feed tube structures for easy replacement or cleaning of different materials. However, in actual operation, feed tube installation requires strict alignment: firstly, the internal spiral feed shaft of the feed tube must be precisely aligned with the output shaft of the drive motor to ensure effective power transmission; secondly, the feed tube outlet must be accurately aligned with the mold's injection port to ensure smooth injection of molten plastic into the mold cavity. Currently, this alignment process relies primarily on manual operation, lacking a guiding mechanism. This results in time-consuming and cumbersome feed tube installation, demanding a high level of operator skill, severely impacting production efficiency and the equipment's continuous operation capability. Summary of the Invention

[0004] (1) Technical problems to be solved

[0005] The purpose of this invention is to overcome the shortcomings of the prior art, adapt to practical needs, and provide an injection molding machine based on the recycling of plastic waste that facilitates the replacement of the material tube, so as to solve the above-mentioned technical problems.

[0006] (2) Technical solution

[0007] To achieve the objectives of this invention, the technical solution adopted is as follows:

[0008] An injection molding machine based on plastic waste recycling and designed for easy replacement of the feed tube includes a base with a slide rail. A reciprocating machine base is mounted on the slide rail. A material hopper is fixedly mounted on the machine base. An injection mold is mounted on one side of the base. A feed tube for conveying and heating plastic is positioned between the material hopper and the machine base. An installation hole is provided inside the feed tube, and a rotating shaft is rotatably and sealably connected to the installation hole. A screw feed rod is fixedly connected to the rotating shaft. A motor for driving the screw feed rod to rotate is mounted on the machine base. The feed tube has a first inlet and a first outlet. The material hopper has a second inlet and a second outlet. The injection mold has an injection inlet. The first outlet faces the injection inlet, and the first inlet faces the second outlet. A first positioning device for assisting in the installation of the feed tube on the machine base is provided, as well as a second positioning device for assisting in the connection between the motor and the screw feed rod.

[0009] The first positioning device includes positioning components respectively disposed on both sides of the machine base, and a positioning rod that cooperates with the positioning component is disposed on both sides of the material tube.

[0010] The positioning assembly includes a first hydraulic cylinder fixedly mounted on a base. A pressure plate is fixedly mounted on the piston rod of the first hydraulic cylinder. A support plate is fixedly mounted on the base. A working hole is provided on the support plate. A cylindrical shell is fixedly mounted inside the working hole. An insertion slot is provided on the cylindrical shell. Multiple positioning elements are evenly distributed along the circumference of the cylindrical shell. Each positioning element includes a working groove on the cylindrical shell, which is connected to the insertion slot. A rotating shaft is rotatably mounted between the side walls of the working groove. An L-shaped rod is fixedly mounted on the rotating shaft. Gears are respectively provided on both sides of the L-shaped rod. The gears are fixedly connected to the rotating shaft. A rack that can reciprocate along the thickness direction of the cylindrical shell is provided in the working groove. The rack meshes with the gear. A pressure block is fixedly mounted on one end of the rack near the outer side of the working groove.

[0011] Each positioning component is provided with a locking component that cooperates with it. The locking component includes a movable through groove provided on the cylindrical shell. A reciprocating locking block is provided in the movable through groove. The locking block is used to press the L-shaped rod. When the locking block presses the L-shaped rod, the side of the locking block and the side of the L-shaped rod are exactly parallel along the thickness direction of the cylindrical shell.

[0012] The second positioning device includes a second hydraulic cylinder fixedly mounted on the machine base. The piston rod of the second hydraulic cylinder is fixedly connected to the motor. A spline is fixedly mounted on the output shaft of the motor, and a spline groove that mates with the spline is mounted on the rotating shaft.

[0013] Two lifting rings are fixedly installed on the upper side of the outer peripheral wall of the material tube.

[0014] Two feet are fixedly installed on the lower side of the outer peripheral wall of the material tube.

[0015] The outer wall of the material tube is wrapped with an electric heating tube. The circuit connector of the electric heating tube adopts a quick-connect structure that connects a socket and a plug. The electric heating tube can be powered by inserting the plug of the electric heating tube into the outer socket.

[0016] The outer periphery of the material pipe is also wrapped with a cooling water delivery pipe, which is connected to an external water pump and is located near the first inlet of the material pipe. The circuit connector of the water pump adopts a quick-connect structure with a socket and plug. The water pump can be powered on by inserting the power cord of the water pump into the external socket, so that circulating water can be sent into the cooling water delivery pipe.

[0017] (3) Beneficial effects:

[0018] A. The cooperation of the first positioning component and the second positioning component facilitates the centering and clamping of the material tube when replacing it with a new one, thereby reducing installation time and improving work efficiency.

[0019] B. By first aligning the two fixing rods and inserting them both into the insertion slots before clamping, it is ensured that when one fixing rod enters the positioning rod but the other fixing rod has not yet fully entered the other positioning rod, the material tube is allowed to float and rotate to a certain extent because there is still a gap between the outer wall of the positioning rod and the inner wall of the insertion slot. This is because immediately clamping the fixing rod that has already entered the positioning rod can easily interfere with the alignment and entry of the other fixing rod. By setting the two fixing rods to be aligned and entered into the positioning rods before aligning and clamping, this situation can be avoided.

[0020] C. When the clamping block presses against the L-shaped rod, the side of the clamping block and the side of the L-shaped rod are parallel along the thickness direction of the cylindrical shell. If one of the L-shaped rods malfunctions and cannot be fully pushed and flipped by the clamping block to clamp the fixing rod, one of the clamping blocks will also be unable to be pushed by the pressing block. Therefore, the pressing block cannot be fully pressed against the side of the cylindrical shell at this time. Thus, compared to observing whether each L-shaped rod is pressed against the fixing rod, observing whether the pressing block is pressed against the cylindrical shell is more helpful for the operator to observe whether the equipment is malfunctioning. This facilitates timely repair when the equipment malfunctions, i.e., when the material tube is not clamped, and avoids further losses caused by the material tube falling off when the machine base is moved later. Attached Figure Description

[0021] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 is a top view of the structure of the present invention;

[0023] Figure 3 is a schematic cross-sectional view of section AA in Figure 2;

[0024] Figure 4 is an enlarged view of point B in Figure 3;

[0025] Figure 5 is a schematic diagram of the cross-sectional structure at point ZZ in Figure 2;

[0026] Figure 6 is an enlarged view of point C in Figure 5;

[0027] Figure 7 is a schematic diagram of the internal structure of the cylindrical shell (after clamping the positioning rod);

[0028] Figure 8 is an enlarged view of point D in Figure 7;

[0029] Figure 9 is a schematic diagram of the internal structure of the cylindrical shell (between the clamping and positioning rods);

[0030] Figure 10 is a schematic diagram showing the position of the white engraved line on the positioning rod. Detailed Implementation

[0031] The present invention will be further described below with reference to Figures 1-10 and embodiments:

[0032] An injection molding machine based on plastic waste recycling and featuring an easily replaceable feed tube includes a base 1, a slide rail 2 mounted on the base 1, a reciprocating machine base 3 mounted on the slide rail 2, a material tank 4 fixedly mounted on the machine base 3, an injection mold 5 mounted on one side of the base 1, a feed tube 6 for conveying and heating plastic between the material tank 4 and the machine base 3, an installation hole 15 provided in the feed tube 6, a rotating shaft rotatably and sealably connected within the installation hole 15, a screw feed rod 16 fixedly connected to the rotating shaft, and a mechanism on the machine base 3 for driving the screw feed rod 16 to rotate. The electric motor 17, the material tube 6 is provided with a first inlet 7 and a first outlet 8, the material barrel 4 is provided with a second inlet 9 and a second outlet 10, the injection mold 5 has an injection inlet 11, the first outlet 8 is directly opposite the injection inlet 11, the first inlet 7 is directly opposite the second outlet 10, the machine base 3 is provided with a first positioning device for assisting the installation of the material tube on the machine base 3, the machine base 3 is provided with a second positioning device for assisting the connection between the electric motor 17 and the screw feed rod 16, and a hydraulic push rod 101 for moving the machine base 3 is fixedly provided on both sides between the machine base 3 and the injection mold 5.

[0033] The first positioning device includes positioning components respectively disposed on both sides of the machine base 3, and a positioning rod 20 cooperating with the positioning components is disposed on both sides of the material tube 6.

[0034] The positioning assembly includes a first hydraulic cylinder 21 fixedly mounted on a base 3. A pressure plate 22 is fixedly mounted on the piston rod of the first hydraulic cylinder 21. A support plate 23 is fixedly mounted on the base 3. A working hole is provided on the support plate 23. A cylindrical shell 24 is fixedly mounted inside the working hole. An insertion groove 25 is provided on the cylindrical shell 24. Multiple positioning elements are evenly distributed along the circumference of the cylindrical shell 24. The positioning element includes a working groove 26 provided on the cylindrical shell 24. The working groove 25 communicates with the insertion groove 26. A rotating shaft 27 is rotatably mounted between the side walls of the working groove 25. An L-shaped rod 28 is fixedly mounted on the shaft 27. Gears 29 are respectively mounted on both sides of the L-shaped rod 28. The gears 29 are fixedly connected to the shaft 27. A rack 30 that can reciprocate along the thickness direction of the cylindrical shell 24 is provided in the working groove 25. The rack 30 meshes with the gears 29. A pressure block 31 is fixedly mounted on one end of the rack 30 near the outside of the working groove 25. A first trapezoidal groove 90 is provided in the working groove 25. A first trapezoidal block that can reciprocate within the first trapezoidal groove 90 is fixedly mounted on the rack 30. A first return spring 91 is fixedly mounted between the side wall of the first trapezoidal groove 90 and the first trapezoidal block.

[0035] Each positioning component is provided with a locking component that cooperates with it. The locking component includes a movable through groove 40 provided on the cylindrical housing 24. A reciprocating locking block 41 is provided in the movable through groove 40. The locking block 41 is used to press the L-shaped rod 28. A second trapezoidal groove 95 is provided in the movable through groove 40. A second trapezoidal block 96 that can reciprocate within the second trapezoidal groove 95 is fixedly provided on the locking block 41. A second return spring 97 is fixedly provided between the side wall of the second trapezoidal groove 95 and the second trapezoidal block.

[0036] The second positioning device includes a second hydraulic cylinder 50 fixedly mounted on the base 3. The piston rod of the second hydraulic cylinder 50 is fixedly connected to the motor 7. A spline 51 is fixedly mounted on the output shaft of the motor 7, and a spline groove 52 that mates with the spline 51 is mounted on the rotating shaft.

[0037] Two lifting rings 60 are fixedly installed on the upper side of the outer peripheral wall of the material pipe 6.

[0038] Two legs 61 are fixedly installed on the lower side of the outer peripheral wall of the material tube 6. The legs make it easy to place the disassembled material tube on the ground.

[0039] The outer peripheral wall of the material tube 6 is wrapped with an electric heating tube. The circuit connector of the electric heating tube adopts a quick-connect structure that connects a socket and a plug. The electric heating tube can be powered by inserting the plug of the electric heating tube into the outer socket.

[0040] The outer periphery of the material pipe 6 is also encased in a cooling water delivery pipe, which is connected to an external water pump. The cooling water delivery pipe is located near the first inlet 7 of the material pipe 6. The water pump's electrical connector uses a quick-connect structure with a socket and plug; simply inserting the water pump's power cord into the external socket powers the pump, allowing circulating water to flow into the cooling water delivery pipe. The purpose of the cooling water delivery pipe is to control the temperature at the inlet and prevent the raw material from melting prematurely, especially for temperature-sensitive materials. Premature melting can lead to degradation and deterioration of the injection molding particles, ultimately affecting the quality of the finished product.

[0041] The positioning rod 20 is provided with a ring of white engraved lines 98 for marking the position. The engraved lines make it easy for manual observation to see whether the positioning rod 20 is inserted into the insertion slot 25 in place. That is, when the pressure block presses down on the white engraved lines 98, it is inserted in place (as shown in Figure 10), so that the next clamping operation can be carried out.

[0042] The working principle of this invention includes the following process:

[0043] When it is necessary to replace the tube of the injection molding machine, first start the hydraulic push rod 101 and push the hydraulic push rod 3 to move a distance away from the injection mold 5, so that the tube can be removed from the machine base 3. Then, hook the two lifting rings 60 of the trolley and use the trolley to slowly move the tube from below the material barrel 4 to the side of the material barrel 4, so that the trolley can remove the tube from above.

[0044] When replacing a new tube, hook the two lifting rings of the gantry crane onto the lifting ring 60, adjust the tube to be replaced to a horizontal position, and then slowly move it onto the base 3. During the movement, manually control the gantry crane to align the positioning rod 20 with the working groove 25 as much as possible, so that the positioning rod 20 can be easily inserted into the working groove 25. With the assistance of the first positioning device, the positioning rod 20 can be automatically corrected even if it is not completely aligned with the working groove 25, thereby assisting the manual insertion of the positioning rod 20 into the working groove 25, thus reducing installation time and improving work efficiency.

[0045] The operation method of the first positioning device is as follows (the initial position of the first positioning device is shown in Figure 9); when the positioning rod 20 approaches the insertion slot 25, if the positioning rod 20 is not completely aligned with the insertion slot 25, the positioning rod 20 will touch the pressure block 31. Then, when the positioning rod 20 continues to move and presses the pressure block 31 into the insertion slot 26, the pressure block 31 will move along with the rack 30. The rack 30 will rotate with the gear 29, causing the L-shaped rod 28 to move towards the fixed rod. This allows the L-shaped rod 28 to push the fixed rod to move. The positioning rod 20 is aligned with the insertion slot 25 by the four L-shaped rods 28 evenly distributed along the circumference on the cylindrical shell 24, allowing the positioning rod 20 to smoothly enter the insertion slot 25. After the positioning rod 20 is aligned and no longer presses the pressure block 31, the first return spring 91 will reset the rack 30, and the gear 29 and L-shaped rod 28 will also reset. Once both positioning rods 20 have entered the insertion slots 25, the first hydraulic cylinder 21 is activated, causing the pressure plate 22 to push the locking block 41 to move. The locking block 41 then pushes the L-shaped rod 28 to flip, causing the L-shaped rod 28 to abut against the positioning rod 20 again, thus achieving clamping.

[0046] By first aligning the two fixing rods and inserting them both into the insertion slot 25 before clamping them, it is ensured that when one fixing rod enters the positioning rod 20 but the other fixing rod has not yet fully entered the other positioning rod 20, the material tube is still allowed to float and rotate to a certain extent because there is still a gap between the outer peripheral wall of the positioning rod 20 and the inner wall of the insertion slot 25. This is because immediately clamping the fixing rod that has already entered the positioning rod 20 would easily interfere with the alignment and entry of the other fixing rod. By first aligning both fixing rods into the positioning rod 20 before clamping them, this situation can be avoided.

[0047] The operation method of the second positioning device is as follows: After the material tube is installed by the first positioning device, the second hydraulic cylinder 50 is started, pushing the motor 17 to move toward the material tube, so that the spline 51 is inserted into the spline groove 52, thereby enabling the motor to drive the screw feed rod 16 to rotate.

[0048] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0051] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. An injection molding machine based on plastic waste recycling and featuring an easy-to-replace feed tube, characterized in that: The system includes a base (1), a slide rail (2) on the base (1), a reciprocating base (3) on the slide rail (2), a material bucket (4) fixedly mounted on the base (3), an injection mold (5) on one side of the base (1), a material pipe (6) for conveying and heating plastic between the material bucket (4) and the base (3), an installation hole (15) inside the material pipe (6), a rotating shaft rotatably and sealably connected inside the installation hole (15), a screw feed rod (16) fixedly connected to the rotating shaft, a motor (17) for driving the screw feed rod (16) to rotate on the base (3), and a first inlet (7) on the material pipe (6). The material barrel (4) is provided with a second inlet (9) and a second outlet (10), the injection mold (5) has an injection inlet (11), the first outlet (8) is directly opposite the injection inlet (11), the first inlet (7) is directly opposite the second outlet (10), the base (3) is provided with a first positioning device for assisting the installation of the material tube on the base (3), the base (3) is provided with a second positioning device for assisting the connection between the motor (17) and the screw feed rod (16); the first positioning device includes positioning components respectively provided on both sides of the base (3), and the material tube (6) is provided with a positioning rod (20) on both sides that cooperates with the positioning components; the positioning components include The system includes a first hydraulic cylinder (21) fixedly mounted on a base (3), a pressure plate (22) fixedly mounted on the piston rod of the first hydraulic cylinder (21), a support plate (23) fixedly mounted on the base (3), a working hole provided on the support plate (23), a cylindrical shell (24) fixedly mounted inside the working hole, an insertion groove (25) provided on the cylindrical shell (24), and multiple positioning elements evenly distributed along the circumference on the cylindrical shell (24); the positioning element includes a working groove (26) provided on the cylindrical shell (24), the working groove (26) communicating with the insertion groove (25), a rotating shaft (27) rotatably mounted between the side walls of the working groove (26), and a fixed plate (22) on the rotating shaft (27). An L-shaped rod (28) is fixedly provided, and gears (29) are respectively provided on both sides of the L-shaped rod (28). The gears (29) are fixedly connected to the rotating shaft (27). A rack (30) that can reciprocate along the thickness direction of the cylindrical shell (24) is provided in the working groove (26). The rack (30) meshes with the gears (29). A pressure block (31) is fixedly provided at one end of the rack (30) near the outside of the working groove (26). A first trapezoidal groove (90) is provided in the working groove (26). A first trapezoidal block that can reciprocate in the first trapezoidal groove (90) is fixedly provided on the rack (30). A first return spring (91) is fixedly provided between the side wall of the first trapezoidal groove (90) and the first trapezoidal block.Each positioning element is provided with a locking element that cooperates with it. The locking element includes a movable through groove (40) provided on the cylindrical housing (24). A reciprocating locking block (41) is provided in the movable through groove (40). The locking block (41) is used to press the L-shaped rod (28). When the locking block (41) presses the L-shaped rod (28), the side of the locking block (41) is parallel to the side of the L-shaped rod (28) along the thickness direction of the cylindrical housing (24).

2. The injection molding machine for easy pipe replacement based on plastic waste recycling as described in claim 1, characterized in that: The second positioning device includes a second hydraulic cylinder (50) fixedly mounted on the base (3). The piston rod of the second hydraulic cylinder (50) is fixedly connected to the motor (17). A spline (51) is fixedly mounted on the output shaft of the motor (17). A spline groove (52) that mates with the spline (51) is mounted on the rotating shaft.

3. The injection molding machine for easy pipe replacement based on plastic waste recycling as described in claim 1, characterized in that: Two lifting rings (60) are fixedly installed on the upper side of the outer peripheral wall of the material pipe (6).

4. The injection molding machine for easy pipe replacement based on plastic waste recycling as described in claim 1, characterized in that: Two legs (61) are fixedly provided on the lower side of the outer peripheral wall of the material pipe (6).

5. The injection molding machine for easy pipe replacement based on plastic waste recycling as described in claim 1, characterized in that: The outer peripheral wall of the material tube (6) is wrapped with an electric heating tube. The circuit connector of the electric heating tube adopts a quick-connect structure that connects a socket and a plug. The electric heating tube can be powered by inserting the plug of the electric heating tube into the outer socket.

6. The injection molding machine for easy pipe replacement based on plastic waste recycling as described in claim 1, characterized in that: The outer periphery of the material pipe (6) is also wrapped with a cooling water delivery pipe. The cooling water delivery pipe is connected to the outer water pump and is located near the first inlet (7) of the material pipe (6). The circuit connector of the water pump adopts a quick-connect structure of socket and plug connection. The water pump can be powered on by inserting the power cord of the water pump into the outer socket, so that the circulating water can be sent into the cooling water delivery pipe.

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