A vacuum negative pressure device for meltblowing

Abstract

The utility model relates to a vacuum negative pressure device for melt-blowing, and relates to a vacuum extraction device in a melt-blowing process, which is used to pull the melt-blown hot air flow through a receiving net smoothly, so that the ejected melt-blown fibers can be smoothly formed into a cloth on the receiving net. It includes a vacuum box, a honeycomb grid plate, a left suction box, a right suction box, a vacuum pipeline, a pressure sensor, a pressure regulating plate 1, a pressure regulating plate 2, a regulating cylinder 1, a regulating cylinder 2, a vacuum pump and a controller; a honeycomb grid plate is installed on the upper end of the vacuum box body. Pressure regulating plates are installed on both sides of the vacuum box, and the regulating plates adjust the negative pressure state in the vacuum box by adjusting the movement of the cylinder. Suction boxes are installed on both sides of the vacuum box, and the two suction boxes are connected into one through a vacuum pipeline and share an air outlet. A vacuum pump is arranged at the air outlet of the vacuum pipeline, and the vacuum pump is controlled by a controller to adjust the vacuum degree and the pumping speed in real time according to production requirements and the value of the pressure sensor.

Description

Technical Field

[0001] The utility model relates to a vacuum negative pressure device for melt-blowing, which relates to vacuum extraction equipment in the melt-blowing process. The main function is to draw the melt-blown hot air flow through a receiving net smoothly, so that the sprayed melt-blown fibers can be smoothly formed into cloth on the receiving net. Background Art

[0002] Meltblowing is a nonwoven fabric production process, mainly used to manufacture disposable medical and sanitary products, such as surgical gowns, protective clothing, masks, etc. In the meltblowing process, the negative pressure device of meltblowing vacuum plays a vital role.

[0003] The meltblown die spinneret assembly sprays the ejected fiber filaments onto the receiving net through high-speed and high-temperature airflows on both sides. A meltblown vacuum negative pressure device is arranged below the receiving net to pull the high-speed and high-temperature airflow. If the efficiency of the negative pressure device pulling is not ideal, the airflow forms a complex flow field above the receiving net, which directly affects the quality and production efficiency of the product. Traditional meltblown vacuum negative pressure devices often use a single-sided vacuum pump, or a vacuum pump on each side. The internal vacuum box structure is complex, resulting in some problems: such as insufficient vacuum degree of the single-sided vacuum pump, large suction on the side close to the vacuum pump, and small suction on the other side. The side with small suction is prone to flying flowers, flying catkins, and light weight; if vacuum pumps are installed on both sides, the two vacuum pumps cannot be synchronized in real time, there is a wind grabbing phenomenon, poor stability, resulting in uneven product weight; the internal structure of the suction box is complex, easy to clog, and difficult to clean. These problems limit the production efficiency and quality of meltblown nonwovens. Summary of the invention

[0004] The utility model aims to solve the above-mentioned shortcomings and provide a vacuum negative pressure device for meltblowing, which is arranged below the meltblown cloth receiving net and can be used very conveniently with the meltblown cloth production line on the market. The device has a simple structure, good stability, convenient maintenance, and high vacuum degree, so that the meltblown fibers can be evenly formed into cloth on the receiving net.

[0005] A vacuum negative pressure device for meltblowing is realized by adopting the following technical solutions:

[0006] A vacuum negative pressure device for meltblowing includes a vacuum box, a honeycomb grid plate, a left suction box, a right suction box, a vacuum pipeline, a pressure sensor, a first pressure regulating plate, a second pressure regulating plate, a first regulating cylinder, a second regulating cylinder, a vacuum pump and a controller.

[0007] A honeycomb grid plate is installed on the upper end of the vacuum box, and three pressure sensors are installed below the honeycomb grid plate. Pressure regulating plate 1 and pressure regulating plate 2 are installed on both sides of the vacuum box, respectively. Pressure regulating plate 1 is equipped with regulating cylinder 1, and pressure regulating plate 2 is equipped with regulating cylinder 2. Pressure regulating plate 1 and pressure regulating plate 2 adjust the negative pressure state in the vacuum box through the movement of regulating cylinder 1 and pressure regulating plate 2 respectively.

[0008] A left suction box and a right suction box are installed on both sides of the vacuum box. The two suction boxes are connected together through a vacuum pipe and share an air outlet. A vacuum pump is installed at the air outlet of the vacuum pipe. The vacuum pump is controlled by a controller to adjust the vacuum degree and pumping speed in real time according to production needs.

[0009] After the vacuum pump is turned on, negative pressure is formed in the vacuum box, and the high-speed and high-temperature airflow passes through the honeycomb grid plate and enters the vacuum box. The pressure sensor monitors the pressure of the vacuum box in real time. When the pressure is lower or higher than the set value, the controller adjusts the movement of the cylinder to control the opening of the pressure regulating plate, thereby adjusting the negative pressure state in the vacuum box so that the melt-blown fibers above are evenly formed into cloth. After passing through the vacuum box, the airflow is discharged through the vacuum pipe.

[0010] The honeycomb grid plate installed at the upper end of the vacuum box has a thickness of 80-120 mm and is hexagonal in shape, with one set of diagonals aligned with the spinneret holes on the spinneret. Compared with the conventional rectangular structure, the alignment structure provides a uniform traction force to the fluid above; the thickness of 80-120 mm combs the airflow and does not cause turbulence. The side length of the grid inside the honeycomb grid plate is 50-60 mm.

[0011] The pressure sensors are evenly distributed and installed below the honeycomb grid plate to detect the pressure in all directions in the vacuum box in real time.

[0012] The vacuum box is a rectangular parallelepiped structure with a square cross section, and the ratio of width and height to length is 1:3; only a pressure regulating plate and a pressure regulating cylinder are installed inside the vacuum box. This structure is an optimized streamline structure to reduce pressure loss and fiber clogging.

[0013] The length of the pressure regulating plate 1 and the pressure regulating plate 2 is about 1 / 3 of the length of the vacuum box, and they are installed above the two sides of the vacuum box through hinges. The regulating cylinder 1 and the regulating cylinder 2 are installed below the pressure regulating plate 1 and the pressure regulating plate 2, respectively. When the pressure sensor detects that the pressure of the vacuum box is lower than or higher than the set value, the controller adjusts the movement of the regulating cylinder to control the opening of the pressure regulating plate, thereby adjusting the negative pressure state of the vacuum chamber.

[0014] The left suction box and the right suction box are respectively installed on both sides of the vacuum box and are connected as a whole through a vacuum pipe.

[0015] The vacuum pipe is a symmetrical structure, and the air outlet is arranged at the symmetrical center.

[0016] The vacuum pump is installed at the air outlet of the vacuum pipe and is used to generate and maintain the negative pressure state of the vacuum box.

[0017] The controller is a PLC programmable controller, which controls the working state of the vacuum pump and the movement of the regulating cylinder according to the value of the pressure sensor. The working frequency and speed of the vacuum pump and the movement of the regulating cylinder can be controlled according to the value of the pressure sensor to ensure that the meltblown cloth produced has stable quality and excellent performance.

[0018] A working principle of a vacuum negative pressure device for meltblowing:

[0019] When a melt-blown vacuum negative pressure device is working, the vacuum pump is turned on to generate a stable negative pressure, and a high-temperature and high-speed airflow of melt-blown fibers is extracted through the vacuum chamber. At the same time, the pressure sensor monitors the pressure of the vacuum chamber in real time and feeds back the pressure data to the controller. The controller compares the pressure data with the set value, adjusts the movement of the regulating cylinder, controls the opening of the pressure regulating plate, and thus maintains the negative pressure state in the vacuum box within the set range.

[0020] A vacuum negative pressure device for meltblowing is reasonably designed. Through optimized design, the advantages of traditional single-sided vacuum and double-sided vacuum are combined, and the disadvantages are improved. And by drawing on the honeycomb structure, a honeycomb grid plate and an adjustable pressure plate are set to form a maximum stable negative pressure extraction at low energy consumption. Fiber blockage is reduced, and production efficiency and product quality are improved. At the same time, the device has the advantages of simple structure, good stability, easy maintenance, high vacuum degree, and meltblown fibers can be evenly formed on the receiving net, providing a strong guarantee for the production of meltblown nonwovens. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the utility model, the following briefly introduces the drawings required for use in the utility model. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the structure of a vacuum negative pressure device for meltblowing;

[0023] Figure 2 yes Figure 1 A AA cross-sectional view of the structure of a vacuum negative pressure device for meltblowing;

[0024] Figure 3 It is a three-dimensional diagram of the structure of a vacuum negative pressure device for meltblowing.

[0025] In the figure: 1. vacuum pipe, 2. left suction bellows, 31. vacuum box, 32. honeycomb grid plate, 41. left adjusting cylinder, 42. left adjusting plate, 43. pressure sensor one, 44. pressure sensor two, 45. pressure sensor three, 46. right adjusting plate, 47. right adjusting cylinder, 5. right suction bellows, 6. vacuum pump, 7. controller. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Refer to the attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 A meltblowing vacuum negative pressure device includes a vacuum pipe 1, a left suction box 2, a vacuum box 31, a honeycomb grid plate 32, a left adjusting cylinder 41, a left adjusting plate 42, a pressure sensor 1 43, a pressure sensor 2 44, a pressure sensor 3 45, a right adjusting plate 46, a right adjusting cylinder 47, a right suction box 5, a vacuum pump 6 and a controller 7.

[0028] A honeycomb grid plate 32 is installed at the upper end of the vacuum box 31 of the meltblowing vacuum negative pressure device, and three pressure sensors 43, 44, and 45 are installed below the honeycomb grid plate 32. Pressure regulating plates 1 42 and 2 46 are installed on both sides of the inside of the vacuum box 31, respectively. Pressure regulating plates 1 42 and 1 46 adjust the negative pressure state in the vacuum box 31 by adjusting the movement of cylinder 1 41 and cylinder 2 47, respectively. Suction box 1 2 and suction box 2 5 are installed on both sides of the vacuum box 31, respectively. Suction box 1 2 and suction box 2 5 are connected as a whole through a vacuum pipe 1 and share an air outlet. A vacuum pump 6 is arranged at the air outlet of the vacuum pipe 1, and the vacuum pump 6 is adjusted by a controller 7 in real time according to production requirements to adjust the vacuum degree and pumping speed. After the vacuum pump 6 is turned on, negative pressure is formed in the vacuum box 31, and the high-speed high-temperature airflow passes through the combing of the honeycomb grid plate 32 and enters the vacuum box 31. The pressure sensors 43, 44, and 45 monitor the pressure of the vacuum box 31 in real time. When the pressure is lower than or higher than the set value, the controller 7 adjusts the movement of the cylinders 41 and 47 to control the opening of the pressure regulating plates 42 and 46, thereby adjusting the negative pressure state in the vacuum box 31 to make the melt-blown fibers above evenly form a cloth. After passing through the vacuum box 31, the airflow is discharged through the vacuum pipe 1.

[0029] The honeycomb grid plate 32 installed at the upper end of the vacuum box 31 has a thickness of 80-120 mm and is hexagonal in shape, with one set of diagonals aligned with the spinneret holes on the spinneret. Compared with the conventional rectangular structure, the traction force on the fluid above is consistent and uniform; the thickness of 80-120 mm combs the airflow and does not cause turbulence. The side length of the grid inside the honeycomb grid plate 32 is 50-60 mm.

[0030] The pressure sensor 1 43 , the pressure sensor 2 44 and the pressure sensor 3 45 are evenly distributed and installed below the honeycomb grid plate 32 to detect the pressure in all directions in the vacuum box 31 in real time.

[0031] The vacuum box 31 is a rectangular parallelepiped structure with a square cross section, and the ratio of width and height to length is 1:3; only pressure regulating plate 1 42, pressure regulating plate 2 46, pressure regulating cylinder 1 41, and pressure regulating cylinder 2 47 are installed inside the vacuum box 31. This structure is an optimized streamline structure to reduce pressure loss and fiber clogging.

[0032] The length of the pressure regulating plate 1 42 and the pressure regulating plate 1 46 is about 1 / 3 of the length of the vacuum box 31, and they are respectively installed above the two sides of the vacuum box 31 through hinges. The regulating cylinder 1 41 and the regulating cylinder 2 47 are respectively installed below the pressure regulating plate 1 42 and the pressure regulating plate 2 46. When the pressure sensor 1 43, the pressure sensor 2 44, and the pressure sensor 3 45 detect that the pressure in the vacuum box 31 is lower than or higher than the set value, the controller 7 adjusts the movement of the regulating cylinder 1 41 and the regulating cylinder 2 47 to control the opening of the pressure regulating plate 1 42 and the pressure regulating plate 2 46, thereby adjusting the negative pressure state in the vacuum box 31.

[0033] The suction box 1 2 and the suction box 2 5 are respectively installed on both sides of the vacuum box 31 and are connected as a whole through the vacuum pipe 1.

[0034] The vacuum pipe 1 is a symmetrical structure, and the air outlet is arranged at the symmetrical center.

[0035] The vacuum pump 6 is installed at the air outlet of the vacuum pipe 1 to generate and maintain a negative pressure state in the vacuum box 31 .

[0036] The controller 7 is a PLC programmable controller, which can control the working frequency and speed of the vacuum pump 6 and the movement of the regulating cylinder 1 41 and the regulating cylinder 2 47 according to the values ​​of the pressure sensor 1 43 , the pressure sensor 2 44 and the pressure sensor 3 45 .

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A vacuum negative pressure device for meltblowing, characterized in that: It includes a vacuum box, a honeycomb grid plate, a left suction box, a right suction box, a vacuum pipeline, a pressure sensor, a pressure regulating plate 1, a pressure regulating plate 2, a regulating cylinder 1, a regulating cylinder 2, a vacuum pump and a controller; A honeycomb grid plate is installed at the upper end of the box body of the vacuum box, and three pressure sensors are installed below the honeycomb grid plate; pressure regulating plate 1 and pressure regulating plate 2 are installed on both sides of the inside of the vacuum box, respectively; pressure regulating plate 1 is equipped with regulating cylinder 1, and pressure regulating plate 2 is equipped with regulating cylinder 2; pressure regulating plate 1 and pressure regulating plate 2 adjust the negative pressure state in the vacuum box through the movement of regulating cylinder 1 and pressure regulating plate 2 respectively; A left suction box and a right suction box are installed on both sides of the vacuum box respectively. The two suction boxes are connected into one through a vacuum pipe and share an air outlet. A vacuum pump is arranged at the air outlet of the vacuum pipe. The vacuum pump is controlled by a controller to adjust the vacuum degree and suction speed in real time according to production requirements.

2. A vacuum negative pressure device for meltblowing according to claim 1, characterized in that: The honeycomb grid plate installed on the upper end of the vacuum box has a thickness of 80-120 mm and is hexagonal in shape. One set of diagonal lines is aligned with the spinneret holes on the spinneret. The side length of the grid inside the honeycomb grid plate is 50-60 mm.

3. A vacuum negative pressure device for meltblowing according to claim 1, characterized in that: Pressure sensor 1, pressure sensor 2 and pressure sensor 3 are evenly distributed and installed below the honeycomb grid plate to detect the pressure in all directions in the vacuum box in real time.

4. A vacuum negative pressure device for meltblowing according to claim 1, characterized in that: The vacuum box is a rectangular parallelepiped structure with a square cross section, and the ratio of width and height to length is 1:3; only a pressure regulating plate and a pressure regulating cylinder are installed inside the vacuum box.

5. The vacuum negative pressure device for meltblowing according to claim 1, characterized in that: The length of the pressure regulating plate 1 and the pressure regulating plate 2 is 1 / 3 of the length of the vacuum box, and they are installed above the two sides of the vacuum box through hinges.

6. A vacuum negative pressure device for meltblowing according to claim 1, characterized in that: An adjusting cylinder 1 and an adjusting cylinder 2 are respectively installed below the pressure adjusting plate 1 and the pressure adjusting plate 2.

7. A vacuum negative pressure device for meltblowing according to claim 1, characterized in that: The left suction box and the right suction box are respectively installed on both sides of the vacuum box and are connected as a whole through a vacuum pipe.

8. The vacuum negative pressure device for meltblowing according to claim 1, characterized in that: The vacuum pipe is a symmetrical structure, and the air outlet is arranged at the symmetrical center.

9. A vacuum negative pressure device for meltblowing according to claim 1, characterized in that: The vacuum pump is installed at the air outlet of the vacuum pipe and is used to generate and maintain the negative pressure state of the vacuum box.

10. The vacuum negative pressure device for meltblowing according to claim 1, characterized in that: The controller is a PLC controller, which controls the working state of the vacuum pump and adjusts the movement of the cylinder according to the value of the pressure sensor.

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