CN111805826A

CN111805826A - Raw material belt calendering mechanism convenient for thickness control and control method thereof

Info

Publication number: CN111805826A
Application number: CN202010670867.3A
Authority: CN
Inventors: 黄文昌; 李智勇; 黄建斌
Original assignee: Fujian Bang Up Fluorine Plastic Product Co ltd
Current assignee: Fujian Bang Up Fluorine Plastic Product Co ltd
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2020-10-23
Anticipated expiration: 2040-07-13
Also published as: CN111805826B

Abstract

The invention discloses a raw material belt calendering mechanism convenient for thickness control, which belongs to the field of calenders and comprises a calender body, wherein a discharge end of the calender body is provided with a discharge conveying assembly, and the discharge conveying assembly is provided with two auxiliary rollers for tiling a raw material belt; the light-dimming illuminating lamp is arranged on one side, perpendicular to the plane of the raw material belt, of the discharging conveying assembly, and the light-transmitting projection plate and the image collector are arranged on the other side of the raw material belt of the discharging conveying assembly so as to collect shadow distribution of the raw material belt on the light-transmitting projection plate at different positions in the same width direction. According to the change condition of the shade color, the change condition of the thickness of the raw material belt on the whole width can be detected; meanwhile, the thickness change of the whole roll is recorded, so that the quality of the whole roll can be conveniently known.

Description

Raw material belt calendering mechanism convenient for thickness control and control method thereof

Technical Field

The invention relates to the field of calenders, in particular to a raw material belt calendering mechanism convenient for thickness control and a control method thereof.

Background

The calender is mostly a two-roller calender, and the rotational speed of two rollers is the same and the rotational speed is opposite makes the material receive the calendering effect and attenuate thickness, but does not have shear stress. The diameter, roundness, width, adjustable range of roller gap, variable speed range and heating mode of the roller are the main technical parameters of the calender. The surface of the roller needs to be smooth, and the chrome plating and the polishing need to be mirror finish. The diameter of the roller is not less than 30 cm. The heating method can be hot water, steam, electric heating, infrared heating, etc. The lower roll of the calendering roller is usually fixed, and in order to ensure the uniform thickness of the raw material belt, the surface of the lower roll is processed into an arc shape. The edge difference is about 3%. The upper roller adjusts the roller gap by the up-and-down movement of the pressing adjusting device. The roller is supported by ball bearings. The PTFE dispersion resin and the extrusion aid are mixed in a certain proportion, then the mixture is molded into a bar or sheet parison, and the parison is inserted into two calendering roll gaps which rotate oppositely and are adjusted to a certain gap, so that the thickness of the parison is obviously reduced, namely the calendering process. There are divided into a one-step calendering method and a multi-step calendering method. A one-step rolling method, namely obtaining a rolled film with required thickness by rolling of a pair of rolling rollers; multi-step calendering processes generally involve calendering thicker preforms through two or more pairs of calender rolls to achieve the desired thickness. Before rolling, the content of extrusion aid in the parison is ensured to be within the required range, and if the extruded strip-shaped parison is not used immediately, the extruded strip-shaped parison is stored in a closed plastic bag and is put into hot water at about 60 ℃ for heating so as to soften the parison and enable the parison to be rolled widely. The more difficult to handle in calendering is a soft and slippery strip-like parison, which is less likely to jam into narrow calender roll gaps. The solution is to install a guide device at the central part of the calendering roller to play a role of limiting the slippage of the strip-shaped parison and smoothly enter the joint point of the calendering roller. The guiding device can be a straight pipe which is thicker than the parison and is 80-150 mm longer, but the guiding fishplate is more practical to install. In order to facilitate plugging into the gaps of the calendering rolls, a section of the parison with the length of 200-300 mm can be pressed into a flat shape or the front end of the parison is wrapped by rough paper and plugged into the gaps by virtue of friction. The rolling roller gap can be widened at the beginning of the thick and flat belt parison, and the gap is gradually reduced after the parison enters the gap. The width of the rolled film is related to the diameter of the parison, the width of the parison, and the width of the calender roll, and more importantly, the diameter of the calender roll. The larger the width of the reduction roll, the larger the diameter of the reduction roll is required. When a 200mm wide film is to be calendered, it is calendered on a calendering roll having a diameter of 150mm and a width of 300 mm. The calendering roller can be heated by hot water at 50-80 ℃ to facilitate calendering, and the rotating speed of the calendering roller can be 1.5-4.0 m/min. The width of the rolled film can be enlarged by a little by properly increasing the rotation speed and temperature of the rolling rolls. The thinnest thickness of the calendered film was 50 um. The main parameters of the calendering process are the speed of rotation of the calendering rolls and the temperature of its surface, which are generally difficult to predetermine, since they are strongly related to the properties of the parison. The surface temperature of the calendering roller is increased to be beneficial to softening the parison and reducing the calendering pressure, but the extrusion assistant is volatilized too fast due to too high temperature, so that the calendered film is torn.

Chinese patent document publication No. CN207618727U discloses an intelligent thickness measuring device of raw material belt machine, including thickness measuring box main part, last gyro wheel, lower gyro wheel and elevating gear, be equipped with thickness measuring chamber in the thickness measuring box main part, elevating gear sets up the top in thickness measuring chamber, go up the gyro wheel with lower gyro wheel symmetry sets up in the thickness measuring chamber, just go up the gyro wheel and be located directly over the lower gyro wheel, elevating gear includes lifter and driving motor, the lifter is located one end in the thickness measuring chamber with go up the gyro wheel and connect.

The existing thickness detector generally needs to sample and detect the raw material belt, the width measurable at one time is limited, the detection needs to be divided into a plurality of times, the online detection has ultrasonic thickness detection and the like, but the thickness detection precision is poor.

Disclosure of Invention

In order to overcome the defects of the prior art, the technical problem to be solved by the invention is to provide the raw material tape calendering mechanism with the thickness convenient to control, the thickness condition of the width of the whole raw material tape can be detected on line in real time, the thickness change condition of the whole roll can also be detected, and the detection precision is high.

In order to achieve the purpose, the invention adopts the following technical scheme:

the raw material belt calendering mechanism convenient for thickness control comprises a calender body, wherein a discharge end of the calender body is provided with a discharge conveying assembly, and the discharge conveying assembly is provided with two auxiliary rollers for tiling a raw material belt; the light-dimming illuminating lamp is arranged on one side, perpendicular to the plane of the raw material belt, of the discharging conveying assembly, and the light-transmitting projection plate and the image collector are arranged on the other side of the raw material belt of the discharging conveying assembly so as to collect shadow distribution of the raw material belt on the light-transmitting projection plate at different positions in the same width direction.

The invention preferably adopts the technical scheme that a square shading cylinder is arranged below the projection plate, a square through groove is formed in the middle of the square shading cylinder, and the image collector is arranged towards the inside of the square through groove so as to collect the light and shadow distribution condition of the square through groove.

The invention has the preferable technical scheme that the light-transmitting projection plate is made of white light-transmitting materials, so that the image collector can collect shadows on the light-transmitting projection plate; the distance between the light-transmitting projection plate and the raw material belt is less than or equal to 2 mm.

The preferable technical scheme of the invention is that the calender body is provided with a fixed calender roll, a lifting calender roll, a frame and a control center; the two ends of the lifting calendering roller are connected with the rack in a sliding mode, the two ends of the lifting calendering roller are provided with lifting control mechanisms, and the control center is electrically connected with the lifting control mechanisms and the image collector to automatically adjust the distance between the lifting calendering roller and the fixed calendering roller.

The invention preferably adopts the technical scheme that a plurality of heaters are arranged in the fixed calendering roller along the width direction, and the heaters are electrically connected with the control center.

The invention has the preferable technical scheme that the lifting control mechanism comprises a speed reducing motor, a driving turbine and a transmission screw; the power output end of the speed reducing motor is provided with the driving worm matched with the driving turbine, the driving screw is fixedly connected with the driving turbine, and the two ends of the lifting calendering roller are provided with lifting sliding blocks matched with the driving screw.

The preferable technical scheme of the invention is that the discharging conveying assembly comprises a support frame, the support frame is fixed on the rack and positioned at two sides of the fixed calendering rollers, two auxiliary rollers are rotatably connected between the support frame, and the axes of the two auxiliary rollers are higher than the axes of the lifting calendering rollers.

The material receiving frame is provided with a material receiving motor and a material receiving shaft, the material receiving motor is fixedly connected with the material receiving frame, the material receiving shaft is connected with the material receiving frame in a sliding mode, and one end of the material receiving shaft is connected with the power output end of the material receiving motor in a clamping mode.

The invention has the preferable technical scheme that a limiting flange sleeve is arranged on the material receiving shaft, a locking screw is arranged at one end of the limiting flange sleeve and connected with the material receiving shaft, and a magnetic ring is arranged on the limiting flange sleeve and connected with the material receiving sleeve.

A control method of a raw material tape calendering mechanism convenient for controlling thickness comprises a step S00 that an image collector collects shadow images on a projection plate; step S10, the control center establishes a coordinate system by taking the width direction of the raw material tape as an X axis, and analyzes the shade color depth condition of the whole X axis by taking a square block with the size of 5X 5mm as a pixel point; step S20, presetting several grades of shadow depth in the control center, the control center analyzing and comparing the shadow situation collected by the image collector to determine the corresponding grade; step S30, taking the length direction of the raw rubber belt as a Y axis, and controlling a speed reducing motor to adjust the heights of two ends of a lifting calendering roller by a control center when the control center detects that a certain grade difference exists on the X axis along the Y axis at a certain distance; and step S40, the control center sets a corresponding X coordinate range for the heater, and when the control center detects that the change of the shadow grade along the X-axis direction is not along a linear change, the control center adjusts the power of the heater.

The invention has the beneficial effects that:

the raw material belt calendering mechanism convenient for thickness control comprises a calender body, wherein a discharge end of the calender body is provided with a discharge conveying assembly, and the discharge conveying assembly is provided with two auxiliary rollers for tiling a raw material belt; the light-dimming illuminating lamp is arranged on one side, perpendicular to the plane of the raw material belt, of the discharging conveying assembly, and the light-transmitting projection plate and the image collector are arranged on the other side of the raw material belt of the discharging conveying assembly so as to collect shadow distribution of the raw material belt on the light-transmitting projection plate at different positions in the same width direction. According to the change condition of the shade color, the change condition of the thickness of the raw material belt on the whole width can be detected; meanwhile, the thickness change of the whole roll is recorded, so that the quality of the whole roll can be conveniently known.

Drawings

Fig. 1 is a schematic structural diagram of a raw material tape calendering mechanism for conveniently controlling thickness according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a portion of a square shade tube according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a heater arrangement provided in an embodiment of the present invention;

in the figure:

1. a control center; 2. a calender body; 3. a lift control mechanism; 6. a discharge conveying assembly; 7. an auxiliary roller; 8. a material receiving frame; 21. lifting the calendering roll; 22. a frame; 23. fixing the calendering roller; 231. a heater; 31. a lifting slide block; 32. a drive turbine; 33. a drive worm; 34. a reduction motor; 35. a drive screw; 61. a light-transmissive projection plate; 62. a square shading cylinder; 63. an image collector; 64. a support frame; 65. a dimming illumination lamp; 66. a square through groove; 81. a material receiving shaft; 82. a material receiving motor; 83. a limiting flange sleeve; 84. a magnetic ring; 85. and locking the screw.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1 to 3, this embodiment provides a raw material tape calendering mechanism convenient for thickness control, which includes a calender body 2, a discharge end of the calender body 2 is provided with a discharge conveying assembly 6, and the discharge conveying assembly 6 is provided with two auxiliary rollers 7 for tiling a raw material tape; the light-dimming illuminating lamp 65 is arranged on one side, perpendicular to the raw material belt plane, of the discharging conveying assembly 6, and the light-transmitting projection plate 61 and the image collector 63 are arranged on the other side, perpendicular to the raw material belt plane, of the discharging conveying assembly 6 so as to collect shadow distribution of the raw material belt on the light-transmitting projection plate 61 at different positions in the same width direction. The raw material belt is unfolded and laid flat through the auxiliary roller 7, and the proper illumination intensity is adjusted through the dimming illumination lamp 65, so that the raw material belt can be clearly projected on the light-transmitting projection plate 61, the shade color at the thicker position is darker, and the shade color at the thinner position is lighter. The shade of the shadow is collected by the image collector 63, so that the thickness of the raw material tape is analyzed. Can be directly to the width detection of whole raw material area, it is convenient to detect, and can make things convenient for the problem of analysis contrast raw material area calendering equipment and in time adjust.

Preferably, a square shading cylinder 62 is arranged below the projection plate, a square through groove 66 is arranged in the middle of the square shading cylinder 62, and the image collector 63 faces the inside of the square through groove 66 to collect the distribution situation of partial light and shadow of the square through groove 66. The light at the edge can be conveniently shielded by the square shading cylinder 62, so that the image collector 63 cannot be interfered by the light when collecting images, and the collected images have better definition and contrast. The thickness condition of the raw material belt can be identified more conveniently and accurately.

The invention has the preferable technical scheme that the light-transmitting projection plate 61 is made of white light-transmitting materials, so that the image collector 63 can collect shadows on the light-transmitting projection plate 61; the distance between the light-transmitting projection plate 61 and the raw material belt is less than or equal to 2 mm. Simultaneously adjust luminance the lamp 65 and also be close to the raw material area as far as possible and set up, reduce the marginal illumination influence, reduce the light source teletransmission and cause the uneven problem of light intensity, avoid the uneven problem that influences the projection light and shade degree of light intensity simultaneously, set up the diffusion sheet at lamp 65 front end of adjusting luminance to make light intensity evenly shine on the raw material area, reduce detection error. The light-transmitting projection plate 61 is arranged next to the raw material belt, so that the shadow is not influenced by the adjacent light source due to long-distance transmission, and the light and shadow are not overlapped to influence the detection precision. In a preferred scheme, two light shielding plates are arranged in the square through groove 66, so that the image collector 63 can only collect the projection condition within the width range of the raw material tape.

Preferably, the calender body 2 is provided with a fixed calender roll 23, a lifting calender roll 21, a frame 22 and a control center 1; the two ends of the lifting calendering roll 21 are connected with the rack 22 in a sliding mode, the two ends of the lifting calendering roll 21 are provided with lifting control mechanisms 3, and the control center 1 is electrically connected with the lifting control mechanisms 3 and the image collector 63 to automatically adjust the distance between the lifting calendering roll 21 and the fixed calendering roll 23.

Preferably, a plurality of heaters 231 are arranged in the fixed calendering roll 23 along the width direction, and the plurality of heaters 231 are all electrically connected with the control center 1. When the situation that the thickness of the raw material belt is uneven only in the middle position is detected, the reason is not caused by the heights of the two ends of the lifting calendering roller 21, the flow is uneven due to uneven heating of the raw material belt, and impurities exist on the lifting calendering roller 21 or the fixed calendering roller 23. When the problem of the raw material tape is found only in the middle, the control center 1 adjusts the heating power of the heater 231 at the position so that the heating power is properly higher than that of the surrounding heaters 231 by 1-5 ℃, the heating power is increased by 1 ℃ every time, and whether the judgment condition is improved or not is detected after the adjustment is carried out once until the thickness is uniform, but the maximum temperature difference is not more than 5 ℃. When the temperature is adjusted to the maximum temperature difference, the condition is not changed, which indicates that impurities exist, and therefore timely cleaning is needed.

Preferably, the lifting control mechanism 3 comprises a speed reducing motor 34, a driving turbine 32 and a transmission screw 35; the power output end of the speed reducing motor 34 is provided with the transmission worm 33 matched with the driving worm wheel 32, the transmission screw rod 35 is fixedly connected with the driving worm wheel 32, and the two ends of the lifting calendering roller 21 are provided with lifting slide blocks 31 matched with the transmission screw rod 35. The worm of the worm wheel 32 is driven to rotate by the speed reducing motor 34, and then the transmission screw 35 is driven to control the two ends of the lifting calender roll 21 to lift, so that the fine adjustment of the two ends of the lifting calender roll 21 can be realized through the multi-stage speed reducing effect.

Preferably, the discharging conveying assembly 6 comprises a support frame 64, the support frame 64 is fixed on the frame 22 and located on two sides of the fixed calendering rollers 23, the two auxiliary rollers 7 are rotatably connected between the support frame 64, and the axes of the two auxiliary rollers 7 are higher than the axes of the lifting calendering rollers 21. The auxiliary roller 7 flattens the raw material belt, and the dimming lamp 65 uniformly irradiates perpendicular to the plane of the raw material belt, so that the projection is uniform. The dimming lamp 65 can adjust the intensity of the illumination, thereby making it possible to achieve a suitable illumination intensity,

preferably, the discharging conveying assembly 6 further comprises a material receiving frame 8, a material receiving motor 82 and a material receiving shaft 81 are arranged on the material receiving frame 8, the material receiving motor 82 is fixedly connected with the material receiving frame 8, the material receiving shaft 81 is connected with the material receiving members in a sliding manner, and one end of the material receiving shaft 81 is connected with a power output end of the material receiving motor 82 in a clamping manner. Connect the material axle 81 through the drive of material receiving motor 82 and rotate and can conveniently connect the material automatically, connect the dismantlement that material axle 81 can be convenient simultaneously for can conveniently take off after a roll of raw material area winding is accomplished. Furthermore, a limiting flange sleeve 83 is arranged on the material receiving shaft 81, a locking screw 85 is arranged at one end of the limiting flange sleeve 83 and connected with the material receiving shaft 81, a magnetic ring 84 is arranged on the limiting flange sleeve 83 and connected with the material receiving sleeve, and the material receiving sleeve is a carrier for winding the raw material tape. The limiting flange sleeve 83 can well limit the material receiving sleeve from sliding, and the magnetic ring 84 can play a role in flexibly connecting the material receiving sleeve.

A control method of a raw material tape calendering mechanism convenient for controlling thickness comprises a step S00 that an image collector 63 collects shadow images on a projection plate; step S10, the control center 1 establishes a coordinate system by taking the width direction of the raw material belt as an X axis, and analyzes the shade color depth condition of the whole X axis by taking a square with the size of 5X 5mm as a pixel point; by comparing along the X axis, if the linear change is found and the grades have a certain difference, the end with the maximum thickness is judged to be too high and needs to be adjusted downwards. Step S20, presetting a plurality of grades of shadow depths in the control center 1, and analyzing and comparing the shadow conditions collected by the image collector 63 by the control center 1 to determine the corresponding grades; when a plurality of levels can be set in consideration of the problem of the recognition accuracy, it is necessary to set a certain recognition level error range, that is, when 2 adjacent levels are recognized, it is determined that there is no uniformity problem. Step S30, taking the length direction of the raw rubber belt as a Y axis, and when the control center 1 detects that the X axis has a certain grade difference along the Y axis at a certain distance, the control center 1 controls the speed reducing motor 34 to adjust the heights of the two ends of the lifting calendering roller 21; in order to improve the detection accuracy, for example, when it is detected that the same problem exists for 1 meter, the problem is considered to exist, and adjustment is made. In step S40, the control center 1 sets a corresponding X coordinate range for the heater 231, and when the control center 1 detects that the change in the shade level along the X axis direction is not a linear change, the control center 1 adjusts the power of the heater 231.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.

Claims

1. The utility model provides a raw material area calendering mechanism convenient to control thickness which characterized in that:

the device comprises a calender body (2), wherein a discharge conveying assembly (6) is arranged at the discharge end of the calender body (2), and the discharge conveying assembly (6) is provided with two auxiliary rollers (7) for tiling a raw material belt;

the utility model discloses a screen printing machine, including ejection of compact conveying assembly (6), ejection of compact conveying assembly (6) is perpendicular to raw material area plane one side and is provided with adjust luminance lamp (65), ejection of compact conveying assembly (6) are provided with printing opacity projection board (61) and image collector (63) at raw material area opposite side to gather the shadow distribution of same width direction different positions raw material area on printing opacity projection board (61).

2. The raw material tape calendering mechanism facilitating thickness control as in claim 1, wherein:

the projection plate is characterized in that a square shading cylinder (62) is arranged below the projection plate, a square through groove (66) is formed in the middle of the square shading cylinder (62), and the image collector (63) faces towards the inside of the square through groove (66) so as to collect the partial light and shadow distribution condition of the square through groove (66).

3. The raw material tape calendering mechanism facilitating thickness control as in claim 1, wherein:

the light-transmitting projection plate (61) is made of white light-transmitting materials, so that the image collector (63) can collect shadows on the light-transmitting projection plate (61);

the distance between the light-transmitting projection plate (61) and the raw material belt is less than or equal to 2 mm.

4. The raw material tape calendering mechanism facilitating thickness control as in claim 1, wherein:

the calender body (2) is provided with a fixed calender roll (23), a lifting calender roll (21), a rack (22) and a control center (1);

lift calendering roller (21) both ends with frame (22) sliding connection, lift calendering roller (21) both ends all are provided with lift control mechanism (3), control center (1) with lift control mechanism (3) and the equal electric connection of image collector (63) with automatically regulated lift calendering roller (21) with interval between fixed calendering roller (23).

5. The raw material tape calendering mechanism facilitating thickness control as in claim 4, wherein:

a plurality of heaters (231) are arranged in the fixed calendering roller (23) along the width direction, and the heaters (231) are electrically connected with the control center (1).

6. The raw material tape calendering mechanism facilitating thickness control as in claim 4, wherein:

the lifting control mechanism (3) comprises a speed reducing motor (34), a driving turbine (32) and a transmission screw (35);

the power take off end of gear motor (34) is provided with drive worm wheel (32) complex drive worm (33), drive screw (35) with drive worm wheel (32) fixed connection, lift calendering roller (21) both ends be provided with drive screw (35) complex lift slider (31).

7. The raw material tape calendering mechanism facilitating thickness control as in claim 4, wherein:

ejection of compact conveying subassembly (6) are including support frame (64), support frame (64) are fixed in on frame (22), and are located fixed calendering roller (23) both sides, two supplementary roller (7) rotate connect in between support frame (64), and two supplementary roller (7) axis is higher than lift calendering roller (21) axis.

8. The raw material tape calendering mechanism for facilitating thickness control as in claim 7, wherein:

the discharging conveying assembly (6) further comprises a material receiving frame (8), a material receiving motor (82) and a material receiving shaft (81) are arranged on the material receiving frame (8), the material receiving motor (82) is fixedly connected with the material receiving frame (8), the material receiving shaft (81) is connected with the material receiving members in a sliding mode, and one end of the material receiving shaft (81) is connected with the power output end of the material receiving motor (82) in a clamping mode.

9. The raw material tape calendering mechanism for facilitating thickness control as in claim 8, wherein:

the material receiving shaft (81) is provided with a limiting flange sleeve (83), one end of the limiting flange sleeve (83) is provided with a locking screw (85) to be connected with the material receiving shaft (81), and the limiting flange sleeve (83) is provided with a magnetic ring (84) to be connected with the material receiving sleeve.

10. A method for controlling a raw material tape calendering mechanism for facilitating thickness control according to any one of claims 1 to 9, wherein:

comprises a step S00 that an image collector (63) collects shadow images on a projection plate;

step S10, the control center (1) establishes a coordinate system by taking the width direction of the raw material tape as an X axis, and analyzes the shade color depth condition of the whole X axis by taking a square block with the size of 5X 5mm as a pixel point;

step S20, presetting shade depths of a plurality of grades in a control center (1), and analyzing and comparing the shade situations collected by an image collector (63) by the control center (1) to determine corresponding grades;

step S30, taking the length direction of the raw rubber belt as a Y axis, and when the control center (1) detects that a certain grade difference exists between the X axis and the Y axis along a certain distance, controlling the speed reducing motor (34) by the control center (1) to adjust the heights of the two ends of the lifting calendering roller (21);

step S40, the control center (1) sets a corresponding X coordinate range for the heater (231), and when the control center (1) detects that the change of the shadow level along the X-axis direction is not along the linear change, the control center (1) adjusts the power of the heater (231).