Coagulating bath concentration automatic regulation and control device

Abstract

The utility model provides an automatic coagulating bath concentration regulation and control device, and belongs to the technical field of parameter detection of high-performance fibers. Comprising a sensor, a controller and a control valve, the sensor is located above a coagulating bath, the sensor is installed on a lifting mechanism, and the lifting mechanism controls the displacement of the sensor relative to the coagulating bath; the controller is in signal connection with the sensor and the control valve, and the control valve controls the water supplementing state of the water pipe of the coagulating bath.

Description

Technical Field

[0001] This application relates to an automatic control device for coagulation bath concentration, belonging to the field of parameter detection technology for high-performance fibers. Background Technology

[0002] Wet spinning is a common fiber forming method. After the spinning solution is extruded through the spinneret and stretched in the air jacket, it enters the coagulation bath to solidify into a strip. During the coagulation process, the solvent is separated from the spinning solution and continuously enters the coagulation solution. In order to ensure the stability of the coagulation bath concentration, water needs to be added continuously to avoid the instability of the coagulation bath concentration from affecting the spinning formation, which in turn affects the stability of production and the quality of the finished yarn.

[0003] Currently, the main methods for controlling the concentration of coagulation baths are manual density detection and online refractometer control. Manual density detection involves manually reading a float-type concentration meter and adjusting the valve opening based on the reading to control the rate of water addition. However, this requires experienced operators to monitor the concentration periodically or in real-time, which is time-consuming and labor-intensive, and also carries the risk of uncontrollable and insurmountable individual errors. Online refractometer control offers precise measurements and automatic tracking, but it is more expensive. Especially for some special fibers, the precipitated solvent can corrode the detection instrument if left inside for extended periods, leading to instrument damage, shortened lifespan, and indirectly increasing the cost of stabilizing the coagulation bath concentration. Utility Model Content

[0004] In view of this, this application provides an automatic coagulation bath concentration control device, which can not only accurately detect the concentration of the coagulation bath, but also control the amount of water replenished in the coagulation bath, so as to ensure that the special fibers are formed stably in the coagulation bath.

[0005] An automatic concentration control device for a coagulation bath includes a sensor, a controller, and a control valve. The sensor is located above the coagulation bath and is mounted on a lifting mechanism, which controls its displacement relative to the coagulation bath. The controller is connected to both the sensor and the control valve, and the control valve controls the water supply status of the coagulation bath's water pipe.

[0006] The above scheme uses a sensor as the signal detection unit. The sensor transmits the detected concentration value as a signal source to the controller. The controller then sends a working status signal to the control valve. Based on the received working status signal, the control valve adjusts the opening and closing degree of the water pipe valve to complete the real-time and precise adjustment of the water replenishment status according to the concentration of the coagulation bath.

[0007] Furthermore, as a preferred option:

[0008] The lifting mechanism includes a drive source, an output shaft, and a connecting arm. The drive source drives the output shaft to rotate and lift. The connecting arm is located at the end of the output shaft, and the sensor is mounted on the connecting arm. More preferably, the connecting arm includes a first mounting arm and a second mounting arm. The first mounting arm is fixedly connected to the output shaft, and the second mounting arm is laterally fixed to the first mounting arm. The sensor is fixed to the second mounting arm. The drive source is a cylinder or a hydraulic cylinder, preferably a lifting rotary cylinder or a lifting rotary hydraulic cylinder. The lifting rotary cylinder or lifting rotary hydraulic cylinder can not only drive the output shaft to extend and retract, realizing lifting linear motion, but also drive the sensor to rotate relative to the axis of the output shaft. When the drive source starts according to the setting, it drives the sensor to rotate, and the sensor moves relative to the solidification bath by translational displacement, realizing the sensor moving away from or closer to the solidification bath to be detected. When the output shaft lifts or lowers, the lifting and lowering is synchronously driven by the connecting arm to move the sensor up and down relative to the solidification bath, realizing the sensor moving into or out of the solidification bath liquid.

[0009] The sensor is connected to the controller via a wire.

[0010] A valve is installed on the water pipe, and a control valve is connected to the valve to control it. More preferably, the control valve is a servo motor, which is connected to the controller via a second wire. The rotor of the servo motor is connected to the valve core of the valve. The controller receives a concentration signal and converts it into a servo motor operating signal. The servo motor changes its rotor displacement accordingly, causing the valve core to rotate and thus changing the opening and closing degree of the valve, thereby changing the water flow rate in the water pipe according to the concentration. A bracket is installed on the water pipe, and the servo motor is fixed above the valve by the bracket.

[0011] It also includes a clean water tank, which is configured to correspond with the sensor.

[0012] The lifting mechanism is also equipped with a reference concentration meter to calibrate the concentration.

[0013] In the dry-jet wet spinning production of special fibers, the spinning solution is extruded into nascent fibers and then enters the coagulation bath to coagulate into strips. The above method can avoid excessive changes in the concentration of the coagulation bath due to solvent precipitation, and achieve stable and precise control of the concentration of the coagulation bath. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram illustrating the working principle of this application;

[0016] Figure 2 This is a schematic diagram of the sensor mounting structure in this application;

[0017] Figure 3 This is a schematic diagram of the installation of the control valve in this application;

[0018] Figure 4 This is a schematic diagram of the installation of the control valve from another perspective in this application.

[0019] Numbered in the diagram: 1. Sensor; 11. Upper end; 12. Wire 1; 2. Controller; 3. Control valve; 31. Rotor; 32. Wire 2; 4. Drive source; 41. Output shaft; 42. Connecting arm; 421. First mounting arm; 422. Second mounting arm; 423. Clamp; 5. Water pipe; 51. Valve; 52. Bracket; 521. Horizontal part; 522. Vertical part. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the technical solutions in the embodiments of this application will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit the technical solutions of this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0021] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be located directly or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the orientation or position shown in the accompanying drawings, and are only for ease of description and should not be construed as limiting the present technical solution.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or specifying the number of technical features. "A plurality of" means two or more, unless otherwise explicitly defined.

[0023] This application provides an automatic concentration control device for coagulation bath. The embodiments of this application are described below with reference to the accompanying drawings.

[0024] See Figure 1 , Figure 1The diagram illustrates the working principle of this embodiment. It includes a sensor 1, a controller 2, and a control valve 3. The sensor 1 is located above the coagulation bath and is mounted on a lifting mechanism, which controls its displacement relative to the coagulation bath. The sensor 1 is connected to the controller 2 via wire 12, and the controller 2 is connected to the control valve 3 via wire 32. The coagulation bath is connected to a water supply pipe 5, and the control valve 3 controls the working state of the water supply pipe 5.

[0025] Specifically:

[0026] Combination Figure 2 The lifting mechanism includes a drive source 4, an output shaft 41, and a connecting arm 42. The connecting arm 42 is fixedly installed on the top of the output shaft 41, and the sensor 1 is installed on the connecting arm 42.

[0027] The drive source 4 can specifically be a lifting rotary hydraulic cylinder or a lifting rotary pneumatic cylinder. Taking a lifting rotary pneumatic cylinder as an example, the cylinder is installed on one side of the coagulation bath. When the cylinder operates, its output shaft 41 descends, and the sensor 1, fixed on the output shaft 41, descends relative to the coagulation bath and falls into it to detect the concentration of the bath solution. The detected concentration is transmitted to the controller 2, which processes the concentration signal and sends a corresponding working command to the control valve 3, which means opening the water pipe 5 to replenish water to the coagulation bath. This achieves the correspondence between the concentration of the coagulation bath and the amount of water replenished, enabling precise control of the concentration. After the concentration detection is completed, the output shaft 41 of the lifting rotary pneumatic cylinder rises, causing the sensor 1 to rise above the surface of the coagulation bath. The output shaft 41 rotates, and the connecting arm 42 rotates around the axis of the output shaft 41, causing the sensor 1 to rotate, lifting it off the coagulation bath and onto a clean water tank. The output shaft 41 then descends again, immersing the sensor 1 in clean water for cleaning. The rotation angle can be set according to actual conditions.

[0028] The connecting arm 42 is located at the end of the output shaft 41. Figure 2 (The top is in the middle). Preferably, the connecting arm 42 includes a first mounting arm 421 and a second mounting arm 422. The first mounting arm 421 is fixedly connected to the output shaft 41, and the second mounting arm 422 is laterally fixed to the first mounting arm 421. The sensor 1 is fixed to the second mounting arm 422. A clamp 423 can be fixed to the end of the second mounting arm 422. The shape of the clamp 423 is adapted to the upper end 11 of the sensor 1. The upper end 11 can be provided with threads for anti-slip. The connection between the sensor 1 and the second mounting arm 422 is achieved by clamping the upper end 11 with the clamp 423.

[0029] The above-mentioned configuration of the boom 42 not only facilitates the installation of sensor 1, but also provides displacement space for lifting.

[0030] The controller 2 can be equipped with a touch screen instrument to set and process parameters.

[0031] Valve 51 is installed on water pipe 5, and control valve 3 is connected to valve 51 to control valve 51. Control valve 3 can be a proportional servo valve, or... Figure 3 , Figure 4 The diagram shows the use of a servo motor. Specifically, the servo motor is connected to the controller 2 via wire 32, and the rotor 31 of the servo motor is connected to the valve core of the valve 51.

[0032] The controller 2 receives the concentration signal and converts it into a working signal for the servo motor. The control chip of the servo motor determines the rotation direction and then drives the motor to rotate. This power is transmitted to the rotor 31. The rotor 31 rotates, which in turn drives the valve core of the valve 51 to rotate, changing the opening and closing degree of the valve 51, thereby changing the amount of water flowing through the water pipe 5 according to the concentration.

[0033] During installation, a bracket 52 can be installed on the water pipe 5. The bracket 52 has an inverted L-shaped structure. Its vertical part 522 is fixed to the water pipe 5, and its horizontal part 521 is suspended above the valve 51. The servo motor is fixed on the horizontal part 521 and located above the valve 51. Its rotor 31 passes through the horizontal part 521 and forms a connection with the valve core of the valve 51.

[0034] The above scheme uses sensor 1 and the lifting mechanism to control the coagulation bath water supply switch. Sensor 1 transmits the detected concentration value as a signal source to controller 2. Controller 2 then sends a working status signal to control valve 3. Control valve 3 adjusts the opening and closing degree of valve 51 in water pipe 5 according to the received working status signal, completing the real-time and precise adjustment of the water supply state according to the concentration of the coagulation bath. This process uses sensor 1 and the lifting mechanism to continuously sense the concentration. Controller 2 retrieves control parameters based on spinning position and speed, calculates them, and then adjusts the opening degree of valve 51 through control valve 3 to maintain a stable concentration, achieving automatic concentration control. The lifting mechanism periodically removes and places sensor 1, avoiding prolonged immersion of sensor 1 in the bath solution and preventing corrosion from the solvent in the coagulation bath, while meeting the detection requirements. Simultaneously, when not detecting, sensor 1 can be placed in a clean water tank for cleaning, ensuring the accuracy of the detection data.

[0035] The control valve 3, water pipe 5, and valve 51 constitute the actuator. The rotor 31 of the control valve 3 and the valve 51 are combined to form a valve control unit. Using a servo motor as the control valve 3 not only reduces costs and ensures stable operation, but also provides precise and constant control.

[0036] The aforementioned lifting mechanism is also equipped with a reference concentration meter for concentration calibration. The reference concentration meter is for calibration purposes and can be visually identified using a conventional float sensor; sensor 1 can be an electronic concentration meter such as a Toledo concentration sensor, or a non-contact sensor such as a laser displacement sensor. The float of the laser displacement sensor is equipped with a linear displacement optical scale and a reading head, which effectively avoids corrosion problems during use.

[0037] The above-described embodiments are merely illustrative of several feasible implementations of the present invention, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the present invention, nor are the embodiments intended to limit the scope of protection in the claims of the present invention. For those skilled in the art, various modifications and improvements can be made without departing from the concept of the present invention. All equivalent implementations or changes that do not depart from the present invention should be included in the technology of the present invention.

Claims

1. An automatic concentration control device for a coagulation bath, characterized in that: It includes a sensor, a controller, and a control valve. The sensor is located above the coagulation bath and is mounted on a lifting mechanism, which controls its displacement relative to the coagulation bath. The controller is connected to the sensor and the control valve respectively, and the control valve controls the water supply status of the coagulation bath's water pipe.

2. The automatic concentration control device for a coagulation bath according to claim 1, characterized in that: The lifting mechanism includes a drive source, an output shaft, and a connecting arm. The drive source drives the output shaft to rotate and lift. The connecting arm is located at the end of the output shaft, and the sensor is mounted on the connecting arm.

3. The automatic concentration control device for a coagulation bath according to claim 2, characterized in that: A clamp is provided on the connecting arm, and the upper end of the sensor is mounted on the connecting arm through the clamp.

4. The automatic concentration control device for a coagulation bath according to claim 2, characterized in that: The driving source is a cylinder or a hydraulic cylinder.

5. The automatic concentration control device for a coagulation bath according to claim 4, characterized in that: The driving source is a lifting rotary cylinder or a lifting rotary hydraulic cylinder, which drives the output shaft to extend and retract to perform lifting linear motion and rotational motion.

6. The automatic concentration control device for a coagulation bath according to claim 1, characterized in that: It also includes a clean water tank, which is configured to correspond with the sensor.

7. The automatic concentration control device for a coagulation bath according to claim 1, characterized in that: The water pipe is equipped with a valve, and a control valve is connected to the valve to control the valve.

8. The automatic concentration control device for a coagulation bath according to claim 7, characterized in that: The control valve is a servo motor, which is connected to the controller via a second wire, and the rotor of the servo motor is connected to the valve core of the valve; or the control valve is a proportional valve, which is connected between the controller and the valve on the water pipe.

9. An automatic coagulation bath concentration control device according to any one of claims 1 to 8, characterized in that: The lifting mechanism is also equipped with a reference concentration meter for concentration calibration.

10. The automatic concentration control device for a coagulation bath according to claim 9, characterized in that: The reference concentration meter uses a conventional float sensor for visual identification; the sensor is an electronic concentration sensor or a laser displacement sensor.

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