Injection molding machine charging barrel screw self-cleaning device and cleaning method thereof

Abstract

The invention relates to a self-cleaning device for a screw rod of a charging barrel of an injection molding machine, a special liquid return nozzle is detachably connected to a front machine barrel, the special liquid return nozzle is fixedly connected to a cleaning power device through a liquid return hose, and the cleaning power device comprises a waste liquid recycling box, a cleaning groove position and a liquid adding pump; the liquid adding pump is connected to an inner cavity of a charging barrel of the injection molding machine through a liquid adding hose and a quick connector; a sealing device for sealing the blanking opening is arranged on the blanking opening of the injection seat; and a blanking bushing is nested on the inner wall of the blanking port and is made of stainless steel. A liquid return hose, a cleaning power device, a liquid adding hose and other components are arranged, so that a whole set of device capable of circularly cleaning is formed. The screw does not need to be detached from the injection molding machine to be cleaned, operation is easy and convenient, the cleaning efficiency is high, meanwhile, a charging barrel of the injection molding machine is cleaned, and cleaning is comprehensive. In addition, the blanking bushing is added, so that rust impurities are prevented from influencing the product quality.

Description

Technical Field

[0001] The present invention relates to the field of cleaning and purifying plastic product processing equipment, and particularly to a self-cleaning device for an injection molding machine barrel screw and a cleaning method thereof. Background Art

[0002] In recent years, with the rapid development of chemical industry technology and mechanical industry technology, plastic products have gradually replaced the application of traditional metal products in various fields due to their advantages such as light weight, low cost, and high production efficiency. At the same time, the molding and processing technology of plastic materials has also developed rapidly. During the plastic injection molding process, it is often necessary to change raw materials or colors, and at this time, it is necessary to clean the screw of the injection molding machine. Due to working at high temperatures for a long time, there will be residual high-temperature decomposition products and carbide residues on the screw of the injection molding machine. If these impurities are not cleaned in time, defective products with black impurities will appear in the newly produced plastic parts, reducing the qualified rate of products, even affecting product performance, and also reducing the service life of the screw.

[0003] For example, Chinese Patent Publication (Announcement) No.: CN207014671U, Patent Title: A Safe Cleaning Device for an Injection Molding Machine Screw, which discloses the technical solution of "

[0007] To solve the above technical problems, the present invention provides such a safe cleaning device for an injection molding machine screw, including a bottom plate, a cleaning mechanism, a mounting plate, a lifting mechanism, and a clamping mechanism... and located above the cleaning mechanism; the clamping mechanism is used for clamping and fixing the screw", and the screw is cleaned after being disassembled from the injection molding machine.

[0004] For example, Chinese Patent Publication (Announcement) No.: CN219522851U, Patent Title: A Cleaning Device for an Injection Molding Machine Screw, which discloses the technical solution of "

[0006] To solve the above technical problems, the present invention provides a cleaning device for an injection molding machine screw, including a bottom plate and two first hydraulic push rods arranged on the bottom plate... A cleaning mechanism is arranged above the bottom plate corresponding to the first support plate and the second support plate. The cleaning mechanism can clean the screw", and it also cleans the screw after being disassembled from the injection molding machine.

[0005] This operation method of disassembling the screw from the injection molding machine for cleaning has the disadvantages of being time-consuming and laborious, with a large operation intensity, and the barrel of the injection molding machine is not cleaned, resulting in an incomplete cleaning situation. Summary of the Invention

[0006] The purpose of the present invention is to provide a self-cleaning device for an injection molding machine barrel screw and a cleaning method thereof to solve the problems raised in the above background art.

[0007] To solve the above technical problems, the present invention is achieved by the following technical measures: An automatic cleaning device for the barrel screw of an injection molding machine, including the front barrel of the injection molding machine and the injection seat, is characterized in that: A special nozzle for liquid return is detachably connected to the front barrel, and the special nozzle for liquid return is fixedly connected to the cleaning power device through a liquid return hose. The cleaning power device includes a waste liquid recovery tank for placing waste liquid, a cleaning tank position for placing cleaning agent, and a liquid adding pump as the cleaning power. The liquid adding pump is connected to the inner cavity of the barrel of the injection molding machine through a liquid adding hose and a quick connector; A sealing device for sealing the blanking port is provided at the blanking port of the injection seat; A blanking insert is nested on the inner wall of the blanking port, and the material of the blanking insert is stainless steel.

[0008] Compared with the prior art, the advantages of the present invention are as follows: By setting components such as a liquid return hose, a cleaning power device, and a liquid adding hose, a complete set of devices that can be cleaned cyclically is formed. The cleaning of the screw does not require disassembly from the injection molding machine, the operation is easy and simple, the cleaning efficiency is high, and at the same time, the barrel of the injection molding machine is also cleaned, and the cleaning is relatively comprehensive. In addition, a blanking insert is added to prevent rust and impurities from affecting the product quality.

[0009] As an improvement of the present invention, the sealing device is a cover plate, and the material of the cover plate is stainless steel. The purpose of choosing this design: During cleaning, it can prevent the cleaning liquid from splashing out from the blanking port.

[0010] As an improvement of the present invention, the sealing device is composed of a telescopic plate, a compression spring, an outer plate, and a rear sealing plate. The purpose of choosing this design: As another implementation method of the sealing device, it is more convenient than the cover plate. Under normal conditions, the hopper is not at the blanking port, and the telescopic plate extends out under the action of the compression spring to block the blanking port. When feeding is required, the hopper moves over and pushes the telescopic plate to move backward, thereby opening the blanking port for feeding.

[0011] As an improvement of the present invention, a partition plate is provided in the waste liquid recovery tank. The purpose of choosing this design: Since the components of the cleaning liquid after cleaning include some shredded material particles, etc., the partition plate can block these impurities and prevent them from entering the right cavity, playing a role of rough filtration.

[0012] As an improvement of the present invention, the middle and lower regions of the partition plate are solid plates, and the upper region is a hollow mesh plate. The purpose of choosing this design: Let the liquid of the cleaning liquid flow into the right cavity through the mesh plate in the upper region. Shredded material particles and other impurities sink in the left cavity because they are heavier than water.

[0013] As an improvement of the present invention, the cleaning tank position is provided with a first tank position, a second tank position, and a third tank position, and adjacent tank positions are completely separated by partition boards. The purpose of choosing this design: The first tank position is for placing organic solvent cleaning liquid, the second tank position is for placing strong alkali solution cleaning liquid, and the third tank position is for placing clean water.

[0014] As an improvement of the present invention, a water suction pipe is arranged in the cleaning tank, and a filter cover is arranged at the end of the water suction pipe. The purpose of choosing this design is to let the water suction pipe suck out various cleaning liquids for circulating cleaning, and the function of the filter cover is to prevent foreign objects from being sucked into the water suction pipe.

[0015] The present application also provides a cleaning method for the self-cleaning device of the barrel screw of an injection molding machine. The cleaning steps are as follows:

[0016] S1: Inject the residual material in the empty barrel until it is emptied;

[0017] S2: When the barrel temperature is adjusted to about 220°C, pour in transparent PP material. After the transparent PP material in the hopper enters the feeding section of the screw, then add DOP plasticizer and inject and clean repeatedly until the injected PP material has no spots or variegated colors;

[0018] S3: Clean with the organic solvent in the first tank, soak in the barrel for 30 - 60 minutes, and set the temperature to 60 - 90 degrees;

[0019] S4: Clean with the strong alkali solution in the second tank, soak in the barrel for 30 - 60 minutes, and set the temperature to 60 - 90 degrees;

[0020] S5: Inject clean water from the third tank for cleaning, and set the temperature to 60 - 80 degrees;

[0021] S6: After draining the clean water, set the temperature to 60 degrees and the drying time to 30 minutes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0023] In the drawings:

[0024] Figure 1 is a schematic diagram of the self-cleaning device of the barrel screw of the injection molding machine described in the present invention.

[0025] Figure 2 is a schematic diagram of the cover plate and the feeding port described in the present invention.

[0026] Figure 3 is a schematic diagram of the cleaning power device described in the present invention.

[0027] Figure 4 is a schematic diagram of the partition plate described in the present invention.

[0028] Figure 5 is a schematic diagram of the sealing device described in the present invention.

[0029] Figure 6 Schematic diagram of the blanking part of the present invention.

[0030] Figure 7 Stereogram of the telescopic plate and the outer plate of the present invention.

[0031] Explanation of reference numerals: 1, front barrel; 2, injection seat; 3, special return liquid nozzle; 4, return liquid hose; 5, cleaning power device; 6, waste liquid recovery tank; 7, cleaning tank position; 8, liquid addition pump; 9, liquid addition hose; 10, quick connector; 11, barrel; 12, blanking port; 13, blanking insert; 14, cover plate; 15, telescopic plate; 16, compression spring; 17, outer plate; 18, rear sealing plate; 19, partition plate; 20, solid plate; 21, mesh plate; 22, first slot; 23, second slot; 24, third slot; 25, partition; 26, water suction pipe; 27, filter cover; 28, screw; 29, pre-plasticizing seat; 30, servo motor; 31, hopper; 32, blanking part threaded hole; 33, spring seat; 34, limiting protrusion; 35, positioning hole. Detailed implementation manners

[0032] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0033] Embodiment 1

[0034] Please refer to Figure 1 -7.

[0035] An injection machine barrel screw self-cleaning device provided in this embodiment includes the front barrel 1 and the injection seat 2 of the injection machine. A special return liquid nozzle 3 is detachably connected to the front barrel 1. The special return liquid nozzle 3 is fixedly connected to the cleaning power device 5 through a return liquid hose 4. The cleaning power device 5 includes a waste liquid recovery tank 6 for placing waste liquid, a cleaning tank position 7 for placing cleaning agent, and a liquid addition pump 8 as the cleaning power. The liquid addition pump 8 is connected to the inner cavity of the barrel 11 of the injection machine through a liquid addition hose 9 and a quick connector 10. As a conventional configuration, an injection machine barrel screw self-cleaning device provided in this embodiment also includes a pre-plasticizing seat 29, a servo motor 30, etc.

[0036] A sealing device for sealing the blanking port 12 is provided at the blanking port 12 of the injection seat 2.

[0037] In the embodiment of the present invention application, please refer to Figure 2 and Figure 6 , the sealing device is a cover plate 14, which can prevent the cleaning liquid from splashing out of the blanking port 12 during cleaning. The cover plate 14 is made of stainless steel to prevent rusting.

[0038] In an embodiment of the present invention application, please refer to Figure 5 , the sealing device is composed of a telescopic plate 15 (whose function is to cover the blanking port 12), a compression spring 16 (which pushes the telescopic plate 15), an outer plate 17 (with a cavity inside to accommodate the telescopic plate 15), and a rear sealing plate 18 (bolted to the outer plate 17 and serving as the support for the other end of the compression spring 16). The entire sealing device is fixed to the threaded hole 32 of the blanking part through two positioning holes 35 on the outer plate 17 (see Figure 2 ). This is another implementation manner of the sealing device, which is more convenient than the cover plate 14. Its working principle: When the hopper 31 of the injection molding machine is not at the blanking port 12, there are three compression springs 16 (the compression springs 16 are not shown in the figure) in the three spring seats 33 of the telescopic plate 15. Under the action of the compression springs 16, it extends out. However, due to the limited protrusion 34 provided on its body, it is limited by the internal step of the outer plate 17 ( Figure 5 the dotted line in), and it will not fall off and blocks the blanking port 12. When it is necessary to feed materials, the hopper 31 moves over, and the hopper 31 will push the telescopic plate 15, and the telescopic plate 15 moves backward, thereby opening the blanking port 12 for feeding.

[0039] In an embodiment of the present invention application, please refer to Figure 6 , a blanking insert 13 is nested on the inner wall of the blanking port 12, and the material of the blanking insert 13 is stainless steel. For the raw materials in the barrel 11 of the injection molding machine, since they need to be heated, the water vapor in the raw materials will be emitted from the blanking port 12. If there is no blanking insert 13 made of stainless steel material, it will cause the shell at this place (the material is cast iron) to rust. Since the raw materials need to pass through the blanking port 12, the rust impurities after rusting will be carried into the barrel 11 by the raw materials, resulting in the injection molded products containing these rust impurities, seriously affecting the product quality.

[0040] In an embodiment of the present invention application, please refer to Figure 3 , a partition plate 19 is provided in the waste liquid recovery box 6. Its function is: Since the components of the cleaning liquid after cleaning include some shredded material particles, etc., the partition plate 19 can block these impurities and prevent them from entering the right cavity, playing a role of coarse filtration.

[0041] In an embodiment of the present invention application, please refer to Figure 3 and Figure 4 , the middle and lower layer regions of the partition plate 19 are solid plates 20, and the upper layer region is a hollow mesh plate 21. Let the liquid of the cleaning liquid flow from the mesh plate 21 in the upper layer region into the right cavity. The shredded material particles and other impurities are heavier than water and sink in the left cavity by themselves.

[0042] In an embodiment of the present invention application, please refer to Figure 3, the cleaning tank 7 is provided with a first tank 22, a second tank 23 and a third tank 24, and adjacent tanks are completely separated by a partition 25. The first tank 22 is filled with an organic solvent cleaning solution, the second tank 23 is filled with a strong alkali solution cleaning solution, and the third tank 24 is filled with clean water.

[0043] Further, a water suction pipe 26 is arranged in the cleaning tank 7, and a filter cover 27 is arranged at the end of the water suction pipe 26. The water suction pipe 26 sucks out various cleaning solutions for circulating cleaning, and the function of the filter cover 27 is to prevent foreign objects from being sucked into the water suction pipe 26.

[0044] This application also provides a cleaning method for the self-cleaning device of the injection barrel screw of an injection molding machine. The cleaning steps are as follows:

[0045] S1: Inject the residual material in the empty injection barrel 11 until it is emptied.

[0046] S2: When the temperature of the barrel 11 is adjusted to about 220 °C, pour in the transparent PP material. After the transparent PP material in the hopper enters the feeding section of the screw 28, add the DOP plasticizer and inject and clean repeatedly until the injected PP material has no spots or variegated colors. The addition of dioctyl phthalate (DOP) plasticizer can significantly improve the plasticity and flow properties of the PP material, so that the residue on the barrel 11 and the screw 28 of the transparent PP material can be extruded.

[0047] S3: Clean with the organic solvent in the first tank 22, soak in the barrel 11 for 30 - 60 minutes, and set the temperature to 60 - 90 degrees; the organic solvent is carbon tetrachloride or toluene.

[0048] S4: Clean with the strong alkali solution in the second tank 23, soak in the barrel 11 for 30 - 60 minutes, and set the temperature to 60 - 90 degrees; the strong alkali solution is sodium hydroxide or sodium silicate.

[0049] S5: Inject clean water from the third tank 24 for cleaning, and set the temperature to 60 - 80 degrees.

[0050] S6: After draining the clean water, set the temperature to 60 degrees and the drying time to 30 minutes.

[0051] The beneficial effects of the present invention are as follows: By setting components such as the return liquid hose 4, the cleaning power device 5 and the liquid addition hose 9, a complete set of devices that can circulate and clean is formed. The cleaning of the screw 28 does not need to be disassembled from the injection molding machine, the operation is easy and simple, the cleaning efficiency is high, and at the same time, the barrel 11 of the injection molding machine is also cleaned, and the cleaning is relatively comprehensive. In addition, a blanking insert 13 is added to prevent rust and impurities from affecting the product quality.

[0052] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0053] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A self-cleaning device for a barrel and screw of an injection molding machine, comprising a front barrel (1) and an injection seat (2) of the injection molding machine, wherein: The front barrel (1) is detachably connected to a special liquid return nozzle (3), and the special liquid return nozzle (3) is fixedly connected to a cleaning power device (5) through a liquid return hose (4). The cleaning power device (5) comprises a waste liquid recovery tank (6) for placing waste liquid, a cleaning slot (7) for placing cleaning agent, and a liquid adding pump (8) as a cleaning power, and the liquid adding pump (8) is connected to the inner cavity of the barrel (11) of the injection molding machine through a liquid adding hose (9) and a quick-connect joint (10); a sealing device for sealing the blanking port (12) is arranged on the blanking port (12) of the injection seat (2); a blanking sleeve (13) is nested in the inner wall of the blanking port (12), and the material of the blanking sleeve (13) is stainless steel.

2. The self-cleaning device for the barrel and screw of an injection molding machine according to claim 1, characterized in that: The sealing device is a cover plate (14), and the material of the cover plate (14) is stainless steel.

3. The self-cleaning device for the barrel and screw of an injection molding machine according to claim 1, characterized in that: The sealing device is composed of a telescopic plate (15), a compression spring (16), an outer plate (17) and a rear sealing plate (18).

4. The self-cleaning device for the barrel and screw of an injection molding machine according to claim 1, characterized in that: An isolation plate (19) is arranged in the waste liquid recovery box (6).

5. The self-cleaning device for the barrel and screw of an injection molding machine according to claim 4, characterized in that: The middle and lower regions of the isolation plate (19) are solid plates (20), and the upper region is a hollow mesh plate (21).

6. The self-cleaning device for the barrel and screw of an injection molding machine according to claim 1, characterized in that: The cleaning slots (7) are provided with a first slot (22), a second slot (23) and a third slot (24), and adjacent slots are completely separated by a partition (25).

7. The self-cleaning device for the barrel and screw of an injection molding machine according to claim 1, characterized in that: A water extraction pipe (26) is arranged in the cleaning tank (7), and a filter cover (27) is arranged at the end of the water extraction pipe (26).

8. A cleaning method for a self-cleaning device for a barrel screw of an injection molding machine, comprising the self-cleaning device for a barrel screw of an injection molding machine according to any one of claims 1 to 7, characterized in that: The cleaning steps are as follows: S1: injecting the residual material in the empty injection barrel (11) until it is empty; S2: When the temperature of the barrel (11) is adjusted to about 220°C, pour in the transparent PP material, and after the transparent PP material in the hopper (31) enters the feeding section of the screw, add DOP plasticizer, and repeatedly inject and clean until the injected PP material has no spots or variegated colors; S3: washing with the organic solvent in the first tank (22), soaking in the barrel (11) for 30-60 minutes, and setting the temperature to 60-90 degrees; S4: Clean with the strong alkaline solution in the second tank (23), soak in the barrel (11) for 30-60 minutes, and set the temperature to 60-90 degrees; S5: Inject clean water from the third tank (24) for cleaning, with the temperature set to 60-80 degrees; S6: After draining the water, set the temperature to 60 degrees and the drying time to 30 minutes.

Images