Desalted water adding accurate control device

Abstract

The utility model provides an accurate control device for adding desalted water. The accurate control device comprises a metering tank, a screw pump, a first storage tank, a second storage tank, a mixing tank, a delivery pump, a filter, a metering pump, a polymerization tower, a chain terminator input port, a main raw material caprolactam inlet, a meter, a controller and an electromagnetic valve, the metering tank is connected with the first storage tank and connected to the mixing tank through the screw pump, the metering device is arranged in the mixing tank, and the controller is connected with the mixing tank; the mixing tank is connected with the filter, the second storage tank, the metering pump and the polymerization tower through the delivery pump; the chain terminator input port is connected with the metering tank, and the main raw material caprolactam inlet is connected with the mixing tank; the first electromagnetic valve is arranged between the metering tank and the first storage tank; the second electromagnetic valve is arranged between the screw pump and the mixing tank; the third electromagnetic valve is arranged between the mixing tank and the conveying pump; the fourth electromagnetic valve is arranged between the mixing tank and the main raw material caprolactam inlet; and the fifth electromagnetic valve is arranged between the controller and the mixing tank.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the polymeric production field relates to a desalted water adds accurate control device. BACKGROUND

[0002] The original production line for producing spinning grade chips does not contain a desalted water quantitative adding control device, and now the common production line for producing spinning grade chips is changed into a production line for producing both spinning grade chips and engineering plastic grade chips. The ADY (chain terminator) required by the previous spinning grade chip production line is changed from terephthalic acid to benzoic acid, and the original quantitative adding control device in the production line lacks a mature, stable and reliable desalted water quantitative adding control device.

[0003] The previous common production line for producing spinning grade chips does not contain a desalted water metering device, and benzoic acid is used when adding the chain terminator. In the production process, the powdered ADE (terephthalic acid) is added to the existing caprolactam mixing tank. When producing engineering plastic grade chips, the chain terminator is benzoic acid, and not only caprolactam needs to be added, but also desalted water needs to be added quantitatively. The traditional control method is to preset a quantity, compare the cumulative value with the set value, and stop adding after the preset value is reached by stopping the control valve. However, due to the inertial characteristics of fluid flow, the actual stopping point is often difficult to accurately match the set value, resulting in unavoidable deviations in the control process, affecting control accuracy and efficiency, and causing deviations between the addition amount of desalted water and other additives and the chain terminator and the preset value. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a desalted water adding accurate control device, two opening control valves are added, which can be fully opened, half opened or closed according to the flow, and the flow is controlled, so that the accurate addition of desalted water and other additives and the chain terminator is realized, and the problem that the original production line stopping point is often difficult to accurately match the set value, resulting in unavoidable deviations in the control process, affecting the control accuracy and efficiency is solved. After the desalted water adding accurate control device is installed, the production line reaches the process expectation, and engineering plastic grade chips and spinning grade chips can be produced at the same time.

[0005] The utility model is implemented as follows:

[0006] The utility model provides a desalted water adding accurate control device, which comprises a metering tank, a screw pump, a first storage tank, a second storage tank, a mixing tank, a conveying pump, a filter, a metering pump, a polymerization tower, a chain terminator input port, a main raw material caprolactam inlet, a meter and a controller, and first, second, third, fourth and fifth electromagnetic valves.

[0007] The metering tank is connected to a first storage tank, the first storage tank is connected to a mixing tank top end through a screw pump, a meter is arranged inside the mixing tank, the meter is electrically connected with the mixing tank, and the controller is connected with the mixing tank;

[0008] The mixing tank bottom end is connected to a filter through the delivery pump, the filter is connected to a second storage tank, and the second storage tank is connected to the polymerization tower through a metering pump;

[0009] The chain terminator input port is connected with the metering tank, and the main raw material caprolactam inlet is connected with the mixing tank top end;

[0010] The first electromagnetic valve is arranged between the metering tank and the first storage tank, the second electromagnetic valve is arranged between the screw pump and the mixing tank, the third electromagnetic valve is arranged between the mixing tank and the delivery pump, the fourth electromagnetic valve is arranged between the mixing tank and the main raw material caprolactam inlet, and the fifth electromagnetic valve is arranged between the controller and the mixing tank.

[0011] Further, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve are two-opening control valves, and the two openings are full opening and half opening.

[0012] The utility model has the advantages that:

[0013] The technical problem to be solved by the utility model is to provide a desalinated water adding precise control device, two-opening control valves are additionally arranged, the valves can be switched to full opening, half opening or closed state according to flow, flow is controlled, and thus precise addition of desalinated water and other additives and chain terminators is realized. DRAWINGS

[0014] The utility model will be further described in connection with the embodiments and with reference to the drawings.

[0015] Figure 1 The utility model is a structural schematic view of the device. CONCRETE IMPLEMENTING METHOD

[0016] The technical problem to be solved by the utility model is to provide a desalinated water adding precise control device, and the problem that original production line stop points are difficult to accurately match set values, control process has unavoidable deviation, and control precision and efficiency are affected is solved.

[0017] Embodiment one

[0018] The embodiment provides a desalinated water adding precise control device, as shown in the figure. Figure 1As shown, comprising: metering tank 1, first storage tank 2, screw pump 3, second storage tank 7, mixing tank 4, delivery pump 5, filter 6, metering pump 8, polymerization tower 9, chain terminator input port 10, main raw material caprolactam inlet 11, meter 12 and controller 13, and first solenoid valve 14, second solenoid valve 15, third solenoid valve 16, fourth solenoid valve 17 and fifth solenoid valve 18;

[0019] The controller 13 is a single-chip microcomputer or PC, which can be purchased in the market;

[0020] The metering tank 1 is connected to the first storage tank 2, the first storage tank 2 is connected to the top end of the mixing tank 4 through the screw pump 3, the meter 12 is arranged inside the mixing tank 4, the meter 12 is electrically connected with the mixing tank 4, and the controller 13 is connected with the mixing tank 4;

[0021] The bottom end of the mixing tank 4 is connected to the filter 6 through the delivery pump 5, the filter 6 is connected to the second storage tank 7, and the second storage tank 7 is connected to the polymerization tower 9 through the metering pump 8;

[0022] The chain terminator input port 10 is connected with the metering tank 1, and the main raw material caprolactam inlet 11 is connected with the top end of the mixing tank 4;

[0023] The first solenoid valve 14 is arranged between the metering tank 1 and the first storage tank 2;

[0024] The second solenoid valve 15 is arranged between the screw pump 3 and the mixing tank 4;

[0025] The third solenoid valve 16 is arranged between the mixing tank 4 and the delivery pump 5;

[0026] The fourth solenoid valve 17 is arranged between the mixing tank 4 and the main raw material caprolactam inlet 11;

[0027] The fifth solenoid valve 18 is arranged between the controller 13 and the mixing tank 4;

[0028] The first solenoid valve 14, the second solenoid valve 15, the third solenoid valve 16, the fourth solenoid valve 17 and the fifth solenoid valve 18 are all two-opening control valves, and the two openings are full opening and half opening.

[0029] When the desalted water is added, the pre-addition amount is set in the controller 13, the start metering button of the meter 12 is pressed, the last cumulative value is cleared, the fifth solenoid valve 18 is set to full opening state, the meter 12 starts to accumulate flow and compare, when reaching 80% of the preset value in the controller 13, the fifth solenoid valve 18 is set to half opening state, and when reaching the whole preset value, the fifth solenoid valve 18 is closed.

[0030] When the chain terminator and the additive are added, firstly, the powdered terephthalic acid or benzoic acid is added into the metering tank 1 through the chain terminator input port 10, and then the terephthalic acid or benzoic acid enters the first storage tank 2 through the first electromagnetic valve 14, and is sent into the mixing tank 4 with caprolactam through the screw pump 3 and the second electromagnetic valve 15;

[0031] The main raw material caprolactam is contained in the caprolactam inlet 11, and the addition amount of the caprolactam is controlled by the fourth electromagnetic valve 17; after the terephthalic acid or benzoic acid is added into the mixing tank 4 with caprolactam, the mixing tank 4 is stirred to make the powdered terephthalic acid or benzoic acid completely dissolved in the caprolactam;

[0032] After the concentration of the solution in the mixing tank 4 is qualified by sampling, the solution is discharged through the third electromagnetic valve 16, filtered through the filter 6 by the conveying pump 5, and then enters the second storage tank 7;

[0033] Finally, the solution is continuously input into the polymerization tower 9 according to a certain proportion by the metering pump 8.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0035] The above embodiments and drawings do not limit the product form and style of the present application, and any appropriate changes or modifications made by those skilled in the art to the above embodiments and drawings shall be considered as not departing from the scope of the present application.

Claims

1. A device for precisely controlling the addition of demineralized water, characterized in that, include: Metering tank, screw pump, first storage tank, second storage tank, mixing tank, transfer pump, filter, metering pump, polymerization tower, chain terminator inlet, main raw material caprolactam inlet, metering device and controller, as well as first solenoid valve, second solenoid valve, third solenoid valve, fourth solenoid valve and fifth solenoid valve; The metering tank is connected to the first storage tank, which is connected to the top of the mixing tank via a screw pump. The meter is located inside the mixing tank and is electrically connected to the mixing tank. The controller is connected to the mixing tank. The bottom of the mixing tank is connected to a filter via the delivery pump, the filter is connected to a second storage tank, and the second storage tank is connected to the polymerization tower via a metering pump; The chain terminator inlet is connected to the metering tank, and the main raw material caprolactam inlet is connected to the top of the mixing tank; The first solenoid valve is located between the metering tank and the first storage tank; the second solenoid valve is located between the screw pump and the mixing tank; the third solenoid valve is located between the mixing tank and the delivery pump; the fourth solenoid valve is located between the mixing tank and the inlet of the main raw material caprolactam; and the fifth solenoid valve is located between the controller and the mixing tank.

2. The demineralized water addition precision control device as described in claim 1, characterized in that, The first, second, third, fourth, and fifth solenoid valves are all two-stage control valves, with the two stages being fully open and half open.

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