Polyethylene product processing equipment and extraction device

Abstract

The utility model discloses polyethylene product processing equipment and an extraction device, the extraction device comprises at least two stages of extraction tanks, each stage of extraction tank is horizontally arranged; the guide rollers are respectively arranged at the feeding end of the first-stage extraction tank and the discharging end of the last-stage extraction tank, and each guide roller is in transmission connection with a driving motor; the extraction tank comprises at least two layers of tank bodies, and a drafting roller is arranged between every two adjacent tank bodies; an object to be extracted bypasses the guide roller at the feeding end, then enters the first-stage extraction tank, sequentially passes through each layer of tank body of the first-stage extraction tank through the drafting roller and then enters the next-stage extraction tank, and the object to be extracted passes through the last-stage extraction tank and then is led out through the guide roller at the discharging end. Therefore, the extraction device is more suitable for a processing mode of taking dichloromethane as an extraction agent, the volatilization amount of dichloromethane in the technological process is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical fiber production equipment, in particular to polyethylene product processing equipment and an extraction device. Background Art

[0002] With the growing development of the chemical industry, the use of dichloromethane as an extraction agent has gradually moved from the experimental stage to a mature industrialized stage. Compared to traditional UHMWPE (ultra-high molecular weight polyethylene) fiber production using hydrocarbons and xylene as extraction agents, the dichloromethane solution offers significant advantages in safety and cost. However, due to its volatility and susceptibility to freezing, traditional vertical extraction systems and single-layer horizontal extraction machines, due to their large evaporation area, can result in significant volatilization of dichloromethane during the process, wasting production materials and increasing production costs.

[0003] In view of this, providing an extraction device for polyethylene product processing equipment, in order to be suitable for the processing method of using dichloromethane as an extractant, reduce the volatilization amount of dichloromethane during the process, and reduce production costs, has become an urgent problem to be solved by those skilled in the art. Utility Model Content

[0004] To this end, an embodiment of the present invention provides a polyethylene product processing equipment and an extraction device to solve at least one technical problem existing in the above-mentioned prior art.

[0005] In order to achieve the above objectives, the present invention provides the following technical solutions:

[0006] The utility model provides an extraction device for polyethylene product processing equipment, the extraction device comprising:

[0007] Extraction tanks, the extraction tanks are at least two levels, and the extraction tanks at each level are arranged horizontally;

[0008] Guide rollers, the guide rollers are respectively arranged at the feed end of the first-stage extraction tank and the discharge end of the last-stage extraction tank, and each guide roller is respectively connected to a drive motor;

[0009] The extraction tank comprises at least two layers of tank bodies, and a drafting roller is arranged between two adjacent tank bodies;

[0010] The material to be extracted passes by the guide roller at the feed end and enters the first-stage extraction tank, and passes through the various layers of the first-stage extraction tank in sequence through the drafting roller and enters the next-stage extraction tank. The material to be extracted passes through the final extraction tank and is led out through the guide roller at the discharge end.

[0011] In this way, the guide rollers for active transmission in the extraction tank are set at both ends of the extraction tank. The filament bundle or membrane to be extracted in the extraction tank is located below the dichloromethane liquid level. The guide rollers are located on both sides of the extraction tank, pressing the UHMWPE nascent fiber into the dichloromethane liquid level while also serving as a speed regulator and guide. Compared with traditional vertical extraction tanks, each extraction tank requires an independent lifting and pressing roller. This design is simpler and more reasonable, with higher equipment operating precision and easier maintenance. Compared with vertical extraction machines and single-layer horizontal extraction machines, this design reduces the dichloromethane volatilization area in the extraction equipment, which is more conducive to reducing dichloromethane volatilization waste during production. As a result, the extraction device is more suitable for processing methods using dichloromethane as the extractant, reducing the amount of dichloromethane volatilization during the process and lowering production costs.

[0012] In some embodiments, a water seal layer is provided in the extraction tank, and the guide rollers are all immersed below the liquid surface.

[0013] In some embodiments, the extraction tank is provided with an air extraction port, a water supply port, a DCM liquid inlet and a liquid outlet.

[0014] In some embodiments, the extraction tank is further provided with a high-position emergency liquid outlet and a sewage outlet.

[0015] In some embodiments, the trough bodies in each layer are arranged in a vertical direction.

[0016] In some embodiments, a heating device is provided in each layer of the tank.

[0017] In some embodiments, the heating device includes at least one of a fin heater, a coil heater, a ceramic infrared heater, a shell and tube, and a jacketed heat exchanger.

[0018] In some embodiments, a guide plate is provided in each layer of the tank body.

[0019] The utility model also provides polyethylene product processing equipment, comprising the extraction device as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0021] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in size, without affecting the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0022] Figure 1 This is a schematic structural diagram of the extraction device provided by the utility model.

[0023] Description of reference numerals:

[0024] 1-guide roller, 2-drafting roller, 3-air extraction port, 4-water supply port, 5-heating device, 6-guide plate;

[0025] 7-water seal liquid level, 8-dichloromethane liquid level, 9-liquid inlet, 10-liquid outlet;

[0026] 11-High-level emergency liquid outlet, 12-Sewage outlet. DETAILED DESCRIPTION

[0027] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0028] The following combination Figure 1 The extraction device provided by the utility model is introduced.

[0029] In a specific embodiment, the extraction device provided by the present invention is used for polyethylene product processing equipment. It should be noted that the equipment can be polyethylene fiber processing equipment or polyethylene film processing equipment. The product mentioned herein refers to polyethylene fiber or polyethylene film, and the object to be dried refers to fiber bundle or film. Figure 1As shown, the extraction device includes an extraction tank, a guide roller 1 and a drafting roller 2. The extraction tank has at least two stages, and the extraction tanks at each stage are arranged horizontally. That is to say, in this embodiment, the extraction device consists of an active transmission device supported at both ends + a horizontal extraction tank with ≥2 layers of water seals in the horizontal direction; the guide rollers 1 are respectively arranged at the feed end of the first-stage extraction tank and the discharge end of the last-stage extraction tank, and each guide roller 1 is respectively connected to a drive motor for transmission; the extraction tank includes at least two layers of tank bodies, and in this embodiment, the tank body is provided with three layers, and a drafting roller 2 is provided between two adjacent tank bodies. The extraction tank is provided with an air extraction port 3, a water replenishment port 4, a DCM liquid inlet 9, a liquid outlet 10, a high-level emergency liquid outlet 11 and a sewage outlet 12; the extract bypasses the guide roller 1 at the feed end and enters the first-stage extraction tank of the first stage, and passes through the drafting roller 2 through each layer of the first-stage extraction tank in turn and enters the next-stage extraction tank. After passing through the last-stage extraction tank, the extract is led out through the guide roller 1 at the discharge end. Among them, since there is still a small amount of DCM (dichloromethane) volatilizing in the extraction equipment, the vacuum port can maintain a small amount of negative pressure in the equipment, which can prevent DCM from overflowing even under operating conditions.

[0030] In other words, the extraction device includes an active transmission component and an extraction component, and the transmission and extraction components are sealed. The transmission component is mainly a plurality of motor-driven guide rollers 1; the extraction component includes a sealed extraction tank, an air extraction port 3, a water supply port 4, a DCM liquid inlet 9, a liquid outlet 10, a high-level emergency liquid outlet 11, a sewage outlet 12, and auxiliary devices such as a water seal height adjustment member (not shown in the figure), a guide plate 6, etc. The water seal height is adjusted by adjusting the height of the gate plate. For example, an adjustable gate plate can be installed at the liquid outlet 10; the height of the water seal liquid level needs to be adjusted. If the water seal height is too low, it will not effectively achieve the water seal. If it is too high, it will affect the liquid level balance and be detrimental to production operations. The extract flows slowly in the extraction tank several meters wide. Affected by factors such as wall resistance, surface finish, and the horizontality of the extraction tank, the flow rate of the extract within the flow section is not the same, resulting in different extraction efficiencies of the fibers at different positions in the extraction tank. The installation of some guide plates can play a role in homogenizing the extraction efficiency. The length of the extraction tank can be designed according to process requirements. In order to improve equipment efficiency, the extraction tank length should be greater than 1.5 meters, and the width can be designed according to output.

[0031] Furthermore, the inlet end is the outlet of the extraction liquid, and the outlet end is the inlet of the extraction liquid. The purpose of such a setting is to ensure the overall countercurrent between the extraction liquid and the fiber, so that the direction of liquid replacement of dichloromethane in the extraction tank is generally countercurrent to the direction of fiber advancement. In order to improve the consistency of the extraction effect, a variety of flow guide devices can be designed in the extraction tank to achieve a better concentration gradient in the extraction tank, and the water seal liquid level 7 is located above the dichloromethane liquid level 8.

[0032] It should be understood that stretching rollers 2 are provided between each layer of trough bodies and between each level of extraction troughs to ensure that the filament bundles or membranes to be extracted are introduced or exported between the trough bodies; in this embodiment, the trough bodies of each layer are arranged in a vertical direction, and in accordance with the forward order, the filament bundles or membranes to be extracted enter from the upper trough body of the first-level extraction trough, and enter the lower trough body after being turned by the stretching roller 2, and the distance between the two stretching rollers 2 (the introduction stretching roller and the export stretching roller) corresponding to each layer of trough body gradually increases.

[0033] In this way, the guide rollers 1 for active transmission in the extraction tank are arranged at both ends of the extraction tank, and the filament bundle or membrane to be extracted in the extraction tank is located below the dichloromethane liquid level. The guide rollers 1 are located on both sides of the extraction tank, pressing the UHMWPE (ultra-high molecular weight polyethylene) nascent fiber (or membrane) below the dichloromethane liquid level, and at the same time playing the role of constant speed and guidance; compared with the traditional vertical extraction tank, each extraction tank requires an independent lifting and pressing roller, this design is simpler and more reasonable, the equipment operation accuracy is higher and easier to maintain; compared with the vertical extraction machine and the single-layer horizontal extraction machine, this design makes the volatilization area of dichloromethane in the extraction equipment smaller, which is more conducive to reducing the volatilization waste of dichloromethane in production. As a result, the extraction device is more suitable for the processing method of dichloromethane as the extractant, reducing the volatilization amount of dichloromethane in the process and reducing production costs.

[0034] In some embodiments, a water seal layer is provided in the extraction tank, and the guide rollers 1 are all placed below the liquid level, which includes the water seal liquid level 7 and the dichloromethane liquid level 8. Specifically, the active drive rollers of each extraction tank are at both ends of the extraction tank, the tow or membrane to be extracted in the extraction tank is located below the dichloromethane liquid level, and the upper part of the drive roller surface is higher than the water seal liquid level and the lower part is lower than the dichloromethane liquid level 8. It should be understood that Figure 1 The dichloromethane liquid level is below 8, and all of it is DCM / white oil extract.

[0035] Because extraction temperature significantly impacts extraction effectiveness, heating devices are required for heat dissipation in the extraction equipment, for heating to the process temperature during startup, and for adjusting the extraction process temperature. Therefore, to maintain the process temperature, each tank layer is equipped with a heating device 5. This heating device 5 can be at least one of a fin heater, a coil heater, a ceramic infrared heater, a tube heater, or a jacketed heat exchanger. Furthermore, each tank layer is equipped with a guide plate 6.

[0036] In addition to the above-mentioned extraction device, the present invention also provides a polyethylene product processing equipment including the extraction device. For the structures of other parts of the polyethylene product processing equipment, please refer to the prior art and will not be described in detail here.

[0037] The above specific implementation methods further describe in detail the purpose, technical solutions and beneficial effects of the utility model. It should be understood that the above are only specific implementation methods of the utility model and are not used to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solution of the utility model should be included in the scope of protection of the utility model.

Claims

1. An extraction device for polyethylene product processing equipment, characterized in that: The extraction device comprises: Extraction tanks, the extraction tanks are at least two levels, and the extraction tanks at each level are arranged horizontally; Guide rollers, the guide rollers are respectively arranged at the feed end of the first-stage extraction tank and the discharge end of the last-stage extraction tank, and each guide roller is respectively connected to a drive motor; The extraction tank comprises at least two layers of tank bodies, and a drafting roller is arranged between two adjacent tank bodies; The material to be extracted passes by the guide roller at the feed end and enters the first-stage extraction tank, and passes through the various layers of the first-stage extraction tank in sequence through the drafting roller and enters the next-stage extraction tank. The material to be extracted passes through the final-stage extraction tank and is led out through the guide roller at the discharge end.

2. The extraction device according to claim 1, characterized in that A water seal layer is provided in the extraction tank.

3. The extraction device according to claim 1, characterized in that The extraction tank is provided with an air extraction port, a water supply port, a DCM liquid inlet and a liquid outlet.

4. The extraction device according to claim 3, characterized in that The extraction tank is also provided with a high-position emergency liquid outlet and a sewage outlet.

5. The extraction device according to any one of claims 1 to 4, characterized in that The trough bodies of each layer are arranged in a vertical direction.

6. The extraction device according to claim 5, characterized in that A heating device is provided in the tank body.

7. The extraction device according to claim 6, characterized in that The heating device includes at least one of a fin heater, a coil heater, a ceramic infrared heater, a tube and tube, and a jacket heat exchanger.

8. The extraction device according to claim 5, characterized in that A guide plate is provided in each layer of the tank body.

9. A polyethylene product processing equipment, characterized in that: The invention comprises the extraction device according to any one of claims 1 to 8.

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