Polyurethane rubber lining production process application and processing equipment

Abstract

The invention discloses polyurethane rubber lining production process application and processing equipment, and belongs to the technical field of electromagnetic flowmeter lining processing, and the polyurethane rubber lining production process application and processing equipment specifically comprises the following steps: step 1, before injection molding, putting a polyurethane rubber raw material into a drying box for drying; 2, the dried polyurethane rubber raw material is added into a charging barrel of an injection molding machine, a heating device on the charging barrel is started to heat the polyurethane rubber raw material in the charging barrel, then a screw rod is started, the screw rod rotates in the charging barrel, the polyurethane rubber raw material is conveyed forwards, and the polyurethane rubber raw material is conveyed to the injection molding machine; the plasticizing process of the polyurethane rubber raw material is completed under the cooperation of the screw rod and the charging barrel; thirdly, the molten polyurethane rubber raw material is injected into a mold cavity of the lining mold through a nozzle on an injection molding machine; 4, cooling and curing the polyurethane rubber raw material in the mold cavity; the production process is simple, and the purposes of saving cost, improving efficiency, reducing emission and achieving automation can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic flowmeter lining processing, and in particular relates to polyurethane rubber lining production process application and processing equipment. Background Art

[0002] The lining of the electromagnetic flowmeter is one of its key components, which is mainly used to isolate the measuring tube from the fluid to prevent corrosion and wear while ensuring measurement accuracy.

[0003] In the processing of traditional rubber linings, it is often necessary to mix the rubber raw materials, and then put the mixed rubber materials into a rubber extruder or calender to be processed into a rubber lining. The processed rubber lining also needs to go through vulcanization and trimming steps. The production process is cumbersome, inefficient, high in cost, high in waste of raw materials, and serious environmental pollution. Therefore, it is necessary to provide a polyurethane rubber lining production process application and processing equipment to solve the above technical problems. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a polyurethane rubber lining production process application and processing equipment, which has the characteristics of simple production process, and can achieve the purpose of cost saving, efficiency improvement, emission reduction and automation.

[0005] To achieve the above object, the present invention provides the following technical solution: a polyurethane rubber lining production process application, comprising the following steps: Step 1: Before injection molding, the polyurethane rubber raw material needs to be placed in a drying oven for drying to remove moisture and volatiles in the polyurethane rubber; Step 2: Add the dried polyurethane rubber raw material into the barrel of the injection molding machine, start the heating device on the barrel to heat the polyurethane rubber raw material in the barrel, and then start the screw to rotate in the barrel to transport the polyurethane rubber raw material forward, and complete the plasticization process of the polyurethane rubber raw material under the cooperation of the screw and the barrel; Step 3, injecting the molten polyurethane rubber raw material into the mold cavity of the lining mold through the nozzle on the injection molding machine; Step 4: The polyurethane rubber raw material is cooled and solidified in the mold cavity to form the final polyurethane rubber electromagnetic flowmeter lining.

[0006] Preferably, the drying time of the drying box is 2-4 hours.

[0007] Preferably, the drying temperature in the drying box is 80°C-100°C.

[0008] Preferably, the temperature of the upper barrel of the injection molding machine is 175°C-240°C, and the temperature of the upper nozzle of the injection molding machine is 165°C-230°C.

[0009] Preferably, the aspect ratio of the screw on the injection molding machine is 20:1-25:1, and the compression ratio of the screw on the injection molding machine is 2:1-3:1.

[0010] Preferably, the injection pressure of the injection molding machine is 85MPa-145MPa.

[0011] Preferably, it comprises a drying machine, an injection molding machine and a lining mold, wherein an injection molding cavity is arranged in the lining mold, and an injection molding nozzle connected with the injection molding cavity is arranged in the middle of the lining mold.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The present invention replaces the raw material rubber with polyurethane rubber, and adopts an injection molding machine to perform injection molding on the polyurethane rubber lining. The lining mold is mainly designed according to the electromagnetic flowmeter, and then the electromagnetic flowmeter pipe fitting is put into the mold for injection molding. Generally, a pipe fitting can be demolded within 2-3 minutes. After demolding, it is directly a lining finished product without secondary processing, avoiding the cumbersome problems of traditional processes, and achieving the purposes of cost saving, efficiency improvement, emission reduction and automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the production process structure of the present invention; DETAILED DESCRIPTION The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] Example See also Figure 1 This embodiment provides the following technical solution: polyurethane rubber lining production process application, including the following steps: Step 1: Before injection molding, the polyurethane rubber raw material needs to be placed in a drying oven for drying to remove moisture and volatiles in the polyurethane rubber; Step 2: Add the dried polyurethane rubber raw material into the barrel of the injection molding machine, start the heating device on the barrel to heat the polyurethane rubber raw material in the barrel, and then start the screw to rotate in the barrel to transport the polyurethane rubber raw material forward, and complete the plasticization process of the polyurethane rubber raw material under the cooperation of the screw and the barrel; Step 3, injecting the molten polyurethane rubber raw material into the mold cavity of the lining mold through the nozzle on the injection molding machine; Step 4: The polyurethane rubber raw material is cooled and solidified in the mold cavity to form the final polyurethane rubber electromagnetic flowmeter lining.

[0015] The present invention replaces the raw material rubber with polyurethane rubber, and adopts an injection molding machine to perform injection molding on the polyurethane rubber lining. The lining mold is mainly designed according to the electromagnetic flowmeter, and then the electromagnetic flowmeter pipe fitting is put into the mold for injection molding. Generally, a pipe fitting can be demolded within 2-3 minutes. After demolding, it is directly a lining finished product without secondary processing, avoiding the cumbersome problems of traditional processes, and achieving the purposes of cost saving, efficiency improvement, emission reduction and automation.

[0016] Traditional rubber linings can cause frost and blackening due to time, temperature, humidity, sunlight and other factors, which can seriously affect the performance and quality of the product. In particular, they cannot meet the standards in some occasions that require high cleanliness of the medium. Moreover, the rubber products themselves belong to the chemical industry, which has strict environmental supervision and may cause shutdowns and production stoppages from time to time. As the products cannot be delivered on time, the company will suffer losses.

[0017] Polyurethane rubber has the following advantages over traditional rubber: Polyurethane rubber has high strength, high hardness and high wear resistance. Its tensile strength can be several times that of traditional rubber. At the same time, it exhibits excellent fatigue resistance during repeated stretching and compression. Polyurethane rubber has a wide temperature resistance range and can maintain good performance at temperatures from -30°C to 80°C or even higher. At high temperatures, the hardness and strength of polyurethane elastomers change little, and at low temperatures, they will not become hard and brittle like traditional rubber.

[0018] Polyurethane rubber has good tolerance to chemicals such as oils, solvents, acids and alkalis. It can be used in various harsh chemical environments and is not easily corroded or damaged.

[0019] The polyurethane rubber structure can provide a certain degree of flow field stability, but in some production processes with extremely high precision requirements, the stability of the flow field may be affected by the slight unevenness of the lining. Due to its more uniform structure and better surface smoothness, it can provide a more stable flow field, which is more helpful for high-precision standardized production, solving the problem of high-precision mass production that rubber products cannot achieve.

[0020] Polyurethane rubber lining has excellent insulation performance, which is mainly due to the structure and characteristics of its polymer compound. Polyurethane is made of raw materials such as isocyanate and polyol, which form stable chemical bonds during the reaction process, thus giving polyurethane materials good insulation properties.

[0021] In some embodiments, the drying time of the drying box is 2-4 hours, and the drying temperature in the drying box is 80°C-100°C, which can better remove moisture and volatiles and avoid defects such as bubbles and cracks in the manufactured lining.

[0022] The temperature of the upper barrel of the injection molding machine is 175℃-240℃, and the temperature of the upper nozzle of the injection molding machine is 165℃-230℃, which helps to improve the surface quality and dimensional stability of the product.

[0023] The length-to-diameter ratio of the screw on the injection molding machine is 20:1-25:1, and the compression ratio of the screw on the injection molding machine is 2:1-3:1, which can ensure that the polyurethane rubber material can be evenly plasticized and injected.

[0024] The injection pressure of the injection molding machine is 85MPa-145MPa, and the injection speed should not be too fast to avoid excessive stress in the product, resulting in deformation or cracking.

[0025] Polyurethane rubber lining processing equipment includes a drying machine, an injection molding machine and a lining mold. An injection molding cavity is arranged in the lining mold. An injection molding nozzle connected with the injection molding cavity is arranged in the middle of the lining mold. By arranging the injection molding nozzle in the middle of the lining mold, the traditional method of injection molding from the end of the lining mold is changed, the injection molding efficiency of the lining is improved, the injection molding pressure inside the injection molding cavity is reduced, and the injection molding effect of the lining is improved.

[0026] The working principle of the present invention is as follows: when in use, firstly, the polyurethane rubber raw material is placed in a drying box for drying, the temperature of the drying box is heated to between 80°C and 100°C, and the drying box dries the polyurethane rubber raw material for 2-4 hours to remove moisture and volatiles in the polyurethane rubber; Add the dried polyurethane rubber raw material into the barrel of the injection molding machine, start the heating device on the barrel, heat the barrel to 175℃-240℃, heat the polyurethane rubber raw material in the barrel, and then start the screw to rotate in the barrel to transport the polyurethane rubber raw material forward. At the same time, heat the nozzle temperature on the injection molding machine to 165℃-230℃, and complete the plasticization process of the polyurethane rubber raw material with the cooperation of the screw and the barrel; The molten polyurethane rubber raw material is connected to the injection nozzle on the lining mold through the nozzle on the injection molding machine, and the molten original polyurethane rubber raw material is injected into the mold cavity of the lining mold. After the injection is completed, the polyurethane rubber raw material is cooled and solidified in the mold cavity to form the final polyurethane rubber electromagnetic flowmeter lining. After cooling, the polyurethane rubber electromagnetic flowmeter lining is demolded, and there is no need to perform secondary processing on the polyurethane rubber electromagnetic flowmeter lining.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Polyurethane rubber lining production process application, characterized by: The steps include: Step 1: Before injection molding, the polyurethane rubber raw material needs to be placed in a drying oven for drying to remove moisture and volatiles in the polyurethane rubber; Step 2: Add the dried polyurethane rubber raw material into the barrel of the injection molding machine, start the heating device on the barrel to heat the polyurethane rubber raw material in the barrel, and then start the screw to rotate in the barrel to transport the polyurethane rubber raw material forward, and complete the plasticization process of the polyurethane rubber raw material under the cooperation of the screw and the barrel; Step 3, injecting the molten polyurethane rubber raw material into the mold cavity of the lining mold through the nozzle on the injection molding machine; Step 4: The polyurethane rubber raw material is cooled and solidified in the mold cavity to form the final polyurethane rubber electromagnetic flowmeter lining.

2. The polyurethane rubber lining production process according to claim 1, characterized in that: The drying time of the drying box is 2-4 hours.

3. The polyurethane rubber lining production process according to claim 1, characterized in that: The drying temperature in the drying box is 80°C-100°C.

4. The polyurethane rubber lining production process according to claim 1, characterized in that: The temperature of the upper barrel of the injection molding machine is 175°C-240°C, and the temperature of the upper nozzle of the injection molding machine is 165°C-230°C.

5. The polyurethane rubber lining production process according to claim 1, characterized in that: The aspect ratio of the screw on the injection molding machine is 20:1-25:1, and the compression ratio of the screw on the injection molding machine is 2:1-3:

1.

6. The polyurethane rubber lining production process according to claim 1, characterized in that: The injection pressure of the injection molding machine is 85MPa-145MPa.

7. Polyurethane rubber lining processing equipment, characterized in that: The invention comprises a drying machine, an injection molding machine and a lining mold. An injection molding cavity is arranged in the lining mold, and an injection molding nozzle which is connected with the injection molding cavity is arranged in the middle of the lining mold.

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