Online impurity removal device for chlorinated polyethylene production

Abstract

The utility model discloses a chlorinated polyethylene production on-line impurity removal device which comprises a feeding pipe, the two ends of the feeding pipe are connected with a discharging port of a spin vibration screen and a feeding port of a material receiving bin through correspondingly-arranged connecting hoses, an impurity removal electromagnet is fixed to the outer wall of the feeding pipe, and an impurity collecting device is installed at the bottom end of the feeding pipe. A discharging detection device is further installed between the spin vibration sieve and the material receiving bin, a fixing frame is movably assembled with the feeding pipe, a weight detection device is installed on the fixing frame, and an impurity removal controller is further included; under the control of the impurity removal controller, the impurity removal electromagnet can be electrified to generate an adsorption function so as to adsorb ferromagnetic impurities doped into chlorinated polyethylene particle products, so that the ferromagnetic impurities in particles are removed, and the ferromagnetic impurities are collected by matching with the impurity collection device after the impurity removal electromagnet is powered off; and the product quality is ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of supporting facilities for the production of chlorinated polyethylene granules, and in particular to an online impurity removal device for the production of chlorinated polyethylene. Background Technology

[0002] Considering factors such as production cost and process complexity, most current production of chlorinated polyethylene utilizes the acid-phase process. This involves adding a certain amount of polyethylene granules to pre-prepared acidic water and then introducing a certain amount of chlorine gas under high temperature and pressure to initiate a polymerization reaction. While this process has relatively low equipment requirements and production costs, it generates a large amount of hydrochloric acid during the reaction. Therefore, the reactor surfaces used in the polymerization reaction are enamel-lined to protect the reactor body from corrosion. However, with prolonged production, the enamel on the reactor surface inevitably begins to peel off. Especially in the early stages of peeling, the peeled area is small and difficult to detect in time. Since the reactor body is mostly made of metal, such as iron, peeling exposes the iron to the acidic environment inside the reactor, causing corrosion and rapidly expanding the peeled area. The rust and iron filings produced by the corrosion of the reactor body then become mixed into the chlorinated polyethylene granule product, severely affecting the quality of the chlorinated polyethylene granule product and significantly reducing the service life of the reactor body, thus increasing maintenance and production costs. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an online impurity removal device for chlorinated polyethylene production that can intercept and remove rust, iron filings and other impurities mixed into chlorinated polyethylene particles, which helps to detect the de-ceramization phenomenon in the reactor in a timely manner and ensure product quality.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: an online impurity removal device for chlorinated polyethylene production, used to remove ferromagnetic impurities mixed into chlorinated polyethylene particles, installed between a vibrating screen and a receiving hopper in a chlorinated polyethylene production line, including a feeding pipe, the two ends of which are connected to the discharge port of the vibrating screen and the inlet of the receiving hopper through corresponding connecting hoses, an impurity removal electromagnet fixed on the outer wall of the feeding pipe, an impurity collection device installed at the bottom of the feeding pipe, a discharge detection device installed between the vibrating screen and the receiving hopper, a fixed frame movably mounted on the feeding pipe, a weight detection device installed on the fixed frame, and an impurity removal controller, the impurity removal electromagnet, the impurity collection device, the discharge detection device, and the weight detection device being respectively connected to the impurity removal controller.

[0005] As a preferred technical solution, the impurity collection device includes a collection bag, the port portion of which is fixed to the inner wall of the feeding pipe. A support plate is fixed to the inner wall at the port of the collection bag, and the support plate is arranged opposite to the fixed part of the collection bag. An electric telescopic rod is connected to the support plate, and the electric telescopic rod passes through the feeding pipe and is connected to the control terminal of the impurity removal controller.

[0006] As a preferred technical solution, the inner wall of the feeding pipe is provided with an installation ring groove, and the collection bag is disposed in the installation ring groove.

[0007] As a preferred technical solution, the fixing frame is fixedly suspended at the bottom end of the vibrating screen, a support arm is fixedly installed on the outer wall of the feeding pipe, the support arm is slidably assembled with the fixing frame, and the weight detection device is located directly below the support arm.

[0008] As a preferred technical solution, at least two support arms are evenly distributed, and correspondingly, two weight detection devices are also provided. The weight detection devices are weight sensors, and the weight sensors are connected to the impurity removal controller.

[0009] As a preferred technical solution, the discharge detection device includes a particle flow meter installed on the connecting hose, the feeding pipe, the discharge port of the vibrating screen, or the inlet of the receiving hopper.

[0010] As an improvement to the above technical solution, the impurity removal electromagnets are configured as long strips and are evenly distributed on the outer wall of the feeding pipe, and each impurity removal electromagnet is covered with a hoop for fixing it to the feeding pipe.

[0011] Due to the adoption of the above technical solution, this utility model has the following beneficial effects: When the chlorinated polyethylene granules enter the receiving hopper from the vibrating screen, they flow through the feeding pipe. At this time, under the control of the impurity removal controller, the impurity removal electromagnet is energized and generates an adsorption function, which can adsorb the ferromagnetic impurities mixed in the chlorinated polyethylene granules, thereby removing the ferromagnetic impurities from the granules; when the chlorinated polyethylene granules stop conveying, the impurity removal controller controls the impurity collection device to start and connect to the lower end of the feeding pipe, and the impurity removal controller controls the impurity removal electromagnet to de-energize. At this time, the ferromagnetic impurities adsorbed on the inner wall of the feeding pipe will fall into the impurity collection device, thereby ensuring product quality; the discharge detection device can detect the flow rate of the granules to cooperate with the impurity removal controller to control the current of the impurity removal electromagnet, so as to adjust the impurity removal capacity according to the product flow rate and achieve energy-saving operation; the weight detection device can detect the weight of the collected ferromagnetic impurities, so as to facilitate timely cleaning and maintenance of production equipment. Attached Figure Description

[0012] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0013] Figure 1 This is a schematic diagram of the installation layout of an embodiment of this utility model on a production line;

[0014] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0015] Figure 3 This is a schematic diagram of the closed state of the collection bag according to an embodiment of the present invention;

[0016] Figure 4 This is a schematic diagram of the opening state of the collection bag according to an embodiment of the present invention;

[0017] Figure 5 yes Figure 3 Schematic diagram of the cross-sectional structure along the BB direction;

[0018] In the diagram: 1-Vibrating screen; 2-Receiving bin; 3-Intermediate hopper; 4-Feeding pipe; 5-Connecting hose; 6-Impurity removal electromagnet; 7-Collection bag; 8-Span plate; 9-Electric telescopic rod; 10-Installation ring groove; 11-Fixing frame; 12-Impurity removal controller; 13-Support arm; 14-Weight sensor; 15-Particle flow meter; 16-Clamping ring. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0020] like Figures 1 to 5As shown, the online impurity removal device for chlorinated polyethylene (CPE) production is used to remove corrosion from the reactor body caused by the detachment of anti-corrosion materials inside the reactor. Furthermore, ferromagnetic impurities such as rust generated by this corrosion are mixed into the CPE granules during production and transportation. The entire device is located between the vibrating screen 1 and the receiving hopper 2 in the CPE production line. The inlet of the vibrating screen 1 is connected to the intermediate hopper 3, which is used for cooling the CPE granules, via flexible connecting pipes such as hoses or bamboo-joint pipes. These flexible connecting pipes adapt to the positional changes between the vibrating screen 1 and the intermediate hopper 3 due to vertical vibration during the vibrating screening operation, ensuring the normal transportation of the CPE granules. The receiving hopper 2 is used to receive the CPE granules that can be directly packaged and can also serve as a packaging hopper.

[0021] like Figure 2 As shown, the online impurity removal device for chlorinated polyethylene production specifically includes a feeding pipe 4. Both ends of the feeding pipe 4 are connected to the discharge port of the vibrating screen 1 and the inlet of the receiving hopper 2 via corresponding connecting hoses 5. An impurity removal electromagnet 6 is fixed to the outer wall of the feeding pipe 4. The feeding pipe 4 can be a metal pipe with an anti-corrosion layer or a material through which magnetic lines of force can pass, so as to cooperate with the magnetic field generated by the impurity removal electromagnet 6 to adsorb ferromagnetic impurities mixed in with the chlorinated polyethylene particles, thereby screening out the ferromagnetic impurities as the chlorinated polyethylene particles descend. The impurity removal electromagnet 6 should be made of soft iron or silicon steel that is easily magnetized and easily loses its magnetism for ease of use.

[0022] like Figures 3 to 5 As shown, an impurity collection device is installed at the bottom of the feeding pipe 4. The lower end of the impurity collection device can extend into the connecting hose 5 connected to the receiving bin 2 or into the inlet of the receiving bin 2, for the centralized collection of ferromagnetic impurities separated from the chlorinated polyethylene particles. Specifically, the impurity collection device includes a collection bag 7, which is made of acid-resistant polyester material with a certain tensile strength, and its pore size must be <100 mesh, or even smaller, to prevent the leakage of collected iron filings, etc.

[0023] The port portion of the collection bag 7 is fixed to the inner wall of the feeding pipe 4. To facilitate cleaning of the collection bag 7, its lower end can be configured as a tie-lock structure that can be opened and closed. In this embodiment, 1 / 2 to 3 / 4 of the port of the collection bag 7 can be fixed to the inner wall of the feeding pipe 4 by means of bolts, etc., and a support plate 8 is also fixed on the inner wall at the port of the collection bag 7. The support plate 8 is arranged opposite to the fixed part of the collection bag 7, and an electric telescopic rod 9 is connected to the support plate 8. By extending and retracting the electric telescopic rod 9, the support plate 8 can be pushed and pulled. When the support plate 8 is pushed to adhere to the inner wall of the feeding pipe 4, the bag opening of the collection bag 7 is open. At this time, the ferromagnetic impurities adsorbed by the impurity removal electromagnet 6 can fall freely under their own gravity and be caught by the collection bag 7 after the impurity removal electromagnet 6 is de-energized. When it is not necessary to catch the ferromagnetic impurities, the electric telescopic rod 9 is controlled to retract, so that the support plate 8 is attached to the fixed part of the port of the collection bag 7. At this time, the entire collection bag 7 will be basically attached to one side of the feeding pipe 4 to release the falling channel of the chlorinated polyethylene particles, so that they can smoothly enter the receiving bin 2.

[0024] In this embodiment, an mounting groove 10 is provided on the inner wall of the feeding pipe 4. The collection bag 7 is disposed within the mounting groove 10, so that after the opening of the collection bag 7 is opened by the electric telescopic rod 9, its diameter is larger than the inner wall diameter of the feeding pipe 4, so as to fully collect ferromagnetic impurities. Furthermore, the opening support 8 is an elastic sheet, which can bend inward or outward under the pushing and pulling of the electric telescopic rod 9, adapting to the inner wall of the feeding pipe 4 according to the opening and closing state of the collection bag 7, allowing the opening of the collection bag 7 to fully open and close, and to fit well with the inner wall of the feeding pipe 4. The electric telescopic rod 9 can also be replaced by other components with telescopic functions, such as hydraulic cylinders, hydraulic rods, or electric cylinders.

[0025] A discharge detection device is also installed between the vibrating screen 1 and the receiving bin 2. A fixed frame 11 is movably mounted on the feeding pipe 4. A weight detection device is installed on the fixed frame 11. A cleanliness control 12 is also included. The cleanliness electromagnet 6, the impurity collection device, the discharge detection device, and the weight detection device are respectively connected to the cleanliness control 12. All these components work together to achieve online automatic screening of ferromagnetic impurities within the chlorinated polyethylene particles. The cleanliness control 12 can be configured as a PLC controller, and the electric telescopic rod 9 passes through the feeding pipe 4 and is connected to the control terminal of the cleanliness control 12. This is well-known in the art and will not be described in detail here.

[0026] In this embodiment, the fixed frame 11 is fixedly suspended at the bottom end of the vibrating screen 1, and a support arm 13 is fixedly installed on the outer wall of the feeding pipe 4. The support arm 13 is slidably assembled with the fixed frame 11. The weight detection device is located directly below the support arm 13. After the impurity collection device collects a certain amount of ferromagnetic impurities, the weight of these impurities increases, causing the feeding pipe 4, the support arm 13, etc., to move downwards. The downward movement of these components triggers the weight detection device, so that the impurity removal controller 12 can obtain the weight signal of the ferromagnetic impurities.

[0027] Specifically, at least two support arms 13 are evenly distributed, and correspondingly, two weight detection devices are also provided. Each weight detection device is a weight sensor 14, connected to the impurity removal controller 12. By using multiple weight sensors 14 to detect weight signals, and processing them through the impurity removal controller 12, a more accurate weight signal is obtained. During installation, the support arm 13 is lightly touched to the trigger end of the weight sensor 14, and the detection signal of the weight sensor 14 is initialized in the impurity removal controller 12. This allows the trigger end of the weight sensor 14 to be pressed down as ferromagnetic impurities increase, generating a detection signal. A weight detection upper limit signal is preset in the impurity removal controller 12. When the detection signal of the weight sensor 14 reaches the upper limit signal, it indicates that the ferromagnetic impurities in the collection bag 7 need to be cleaned.

[0028] The discharge detection device includes a particle flow meter 15 installed on the connecting hose 5, the feeding pipe 4, the discharge port of the vibrating screen 1, or the inlet of the receiving bin 2. It is used to detect whether chlorinated polyethylene particles are being conveyed and their flow rate, so as to control the current of the impurity removal electromagnet 6 according to the flow rate, so that its adsorption force matches the flow rate and flow of the chlorinated polyethylene particles, ensuring that all ferromagnetic impurities passing through the feeding pipe 4 can be adsorbed.

[0029] In this embodiment, the impurity removal electromagnet 6 is configured as a long strip structure and is evenly distributed on the outer wall of the feeding pipe 4. Each impurity removal electromagnet 6 is covered with a hoop 16 for fixing it to the feeding pipe 4, so that several impurity removal electromagnets 6 are densely arranged against the wall at the junction of the outlet of the vibrating screen 1 and the inlet of the receiving bin 1, and each impurity removal electromagnet 6 is connected in series to facilitate uniform control of the current magnitude.

[0030] The specific working process of this embodiment is as follows:

[0031] When the impurity removal controller 12 detects chlorinated polyethylene particles being conveyed via the particle flow meter 15, it controls the impurity removal electromagnet 6 to be energized and adjusts the current of the impurity removal electromagnet 6 according to the signal strength detected by the particle flow meter 15. After being energized, the impurity removal electromagnet 6 generates an attraction force. When the chlorinated polyethylene particles flow through this area, the ferromagnetic impurities mixed in are attracted and fixed onto the inner wall of the feeding pipe 4. When the particle flow meter 15 has no detection signal, it indicates that the conveying of chlorinated polyethylene particles has stopped. The impurity removal controller 12 then first controls the electric telescopic rod 9 to extend, pushing out the support plate 8 to open the bag mouth of the collection bag 7. The electromagnet 6 for removing impurities is then de-energized. After de-energization, its attraction disappears, and the ferromagnetic impurities on the inner wall of the feeding pipe 4 fall freely into the collection bag 7. The impurity removal controller 12 controls the electric telescopic rod 9 to return to its original position, closing the collection bag 7 to facilitate the re-feeding of chlorinated polyethylene granules. This control process can be accomplished using a time relay, etc. After ferromagnetic impurities are collected in the collection bag 7, the weight sensor 14 generates a detection signal and transmits it to the impurity removal controller 12. When the detection signal of the weight sensor 14 reaches the upper limit signal, the collection bag 7 needs to be manually cleaned. Since the production of chlorinated polyethylene granules is an intermittent process, the intermittent collection of ferromagnetic impurities can be achieved with the help of contactors, time relays, etc.

[0032] When manual cleaning of the collection bag 7 is required, temporarily shut down the output of the vibrating screen 1, disconnect the feeding pipe 4 from its lower connecting hose 5, remove the bottom end of the collection bag 7 outside the pipe and open the tie at its lower end, and transfer the collected ferromagnetic impurities through another container; after cleaning the collection bag 7, tighten and reset its lower end, and reconnect the feeding pipe 4 and the connecting hose 5. By observing whether there is a detection signal from the weight sensor 14 through the impurity removal controller 12, it is possible to determine whether ferromagnetic impurities are generated, thereby determining whether the equipment is experiencing porcelain deterioration. This avoids the tedious operation of frequently disassembling the equipment for cleaning and inspection, helps reduce production line downtime, and thus ensures production efficiency.

[0033] The description of this utility model is given for illustrative and descriptive purposes only, and is not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the utility model, and to enable those skilled in the art to understand the utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An online impurity removal device for chlorinated polyethylene production, used to remove ferromagnetic impurities incorporated into chlorinated polyethylene particles, is installed between the vibrating screen and the receiving hopper in the chlorinated polyethylene production line, characterized in that: The system includes a feeding pipe, the two ends of which are connected to the discharge port of the vibrating screen and the inlet of the receiving hopper via corresponding connecting hoses. A purification electromagnet is fixed on the outer wall of the feeding pipe, and an impurity collection device is installed at the bottom of the feeding pipe. A discharge detection device is also installed between the vibrating screen and the receiving hopper. A fixed frame is movably mounted on the feeding pipe, and a weight detection device is installed on the fixed frame. The system also includes a purification controller, and the purification electromagnet, the impurity collection device, the discharge detection device, and the weight detection device are respectively connected to the purification controller.

2. The online impurity removal device for chlorinated polyethylene production as described in claim 1, characterized in that: The impurity collection device includes a collection bag, the port of which is fixed to the inner wall of the feeding pipe. A support plate is fixed to the inner wall of the port of the collection bag, and the support plate is positioned opposite to the fixed part of the collection bag. An electric telescopic rod is connected to the support plate, and the electric telescopic rod passes through the feeding pipe and is connected to the control terminal of the impurity removal controller.

3. The online impurity removal device for chlorinated polyethylene production as described in claim 2, characterized in that: The inner wall of the feeding pipe is provided with an installation ring groove, and the collection bag is placed in the installation ring groove.

4. The online impurity removal device for chlorinated polyethylene production as described in claim 1, characterized in that: The fixed frame is fixedly suspended at the bottom of the vibrating screen. A support arm is fixedly installed on the outer wall of the feeding pipe. The support arm is slidably assembled with the fixed frame. The weight detection device is located directly below the support arm.

5. The online impurity removal device for chlorinated polyethylene production as described in claim 4, characterized in that: At least two support arms are evenly distributed, and correspondingly, two weight detection devices are also provided. The weight detection devices are weight sensors, and the weight sensors are connected to the impurity removal controller.

6. The online impurity removal device for chlorinated polyethylene production as described in claim 1, characterized in that: The discharge detection device includes a particle flow meter installed on the connecting hose, the feeding pipe, the discharge port of the vibrating screen, or the inlet of the receiving hopper.

7. The online impurity removal device for chlorinated polyethylene production as described in claim 1, characterized in that: The impurity removal electromagnets are configured as long strips and are evenly distributed on the outer wall of the feeding pipe. Each impurity removal electromagnet is covered with a hoop for fixing it to the feeding pipe.

Images