Online Thickness Measurement System for Extra Wide PC Sheets

Abstract

The invention relates to an online thickness measuring system for ultra-wide PC sheets, comprising a thickness gauge and a thickness change monitoring device. The thickness gauge is installed on a PC sheet production line, a probe of the thickness gauge is located in a detection port, the thickness change monitoring device is installed on the PC sheet production line and is located in front of the thickness gauge, the thickness change monitoring device comprises a pressing arm, a pressing roller and a cylinder, the fixed end of the pressing arm is hinged on a mounting plate through a rotating shaft, the mounting plate is fixed on a crossbeam of a frame of the PC sheet production line, the pressing roller is installed on the free end of the pressing arm, the piston rod of the cylinder is hinged to the free end of the pressing arm, the cylinder shell is fixed on the crossbeam through an articulated seat, one end of the rotating shaft extends out of the mounting plate, and a large sprocket is circumferentially fixed, the mounting plate is biased from the rotating shaft through a bearing to slide with a sprocket shaft, a small sprocket is circumferentially fixed at one end of the sprocket shaft, a chain is arranged between the large sprocket and the small sprocket to transmit power, the other end of the sprocket shaft is connected to an angle sensor, and the angle sensor feeds back a transmission signal to the thickness gauge.

Description

Technical Field

[0001] The invention relates to the field of PC sheets, and in particular to an online thickness measurement system for ultra-wide PC sheets. Background Art

[0002] PC sheet, also known as polycarbonate sheet, is an amorphous, odorless, non-toxic, highly transparent, colorless or slightly yellow thermoplastic engineering plastic. PC sheet has been rapidly developed due to its excellent physical, mechanical and thermal properties. At present, the width of ordinary PC sheets is usually about 1m. The width of the PC sheet production line is relatively small, and there is no special thickness gauge. Usually, the produced PC sheet products are measured manually, and then the die lip size of the mold is manually adjusted according to the thickness deviation measured manually, so as to change the thickness of the PC sheet products. This measurement method must stop the production line before adjusting the die lip size of the mold, and the degree of automation is low. Moreover, the manual measurement method is inefficient and cannot monitor the thickness change of the PC sheet in real time, which easily leads to a high scrap rate of the PC sheet. In the production line of ultra-wide PC sheets, there are hundreds of adjustment screws for the wide mold, which is obviously very difficult to adjust manually. Therefore, there is an urgent need for a thickness measurement system that can be used in the production of ultra-wide PC sheets. Summary of the invention

[0003] The purpose of the present invention is to provide an online thickness measurement system for ultra-wide PC sheets in view of the deficiencies in the prior art, which can monitor the thickness changes of PC sheets in real time and detect the thickness of PC sheets online through a thickness gauge to avoid collision between the probe of the thickness gauge and the PC sheets.

[0004] The technical solution of the present invention is: an online thickness measurement system for ultra-wide PC sheets, comprising a thickness gauge and a thickness change monitoring device, wherein the thickness gauge is installed on a PC sheet production line, the thickness gauge is provided with a probe for detecting the thickness of the PC sheet, the probe is located in a detection port set on the thickness gauge for allowing the PC sheet to pass through, and the PC sheet passing through is detected by the left and right reciprocating motion of the probe, the thickness change monitoring device is installed on the PC sheet production line and is located in front of the thickness gauge, the thickness change monitoring device comprises a pressing arm, a pressing roller, and a cylinder, and the fixed end of the pressing arm is hinged on a mounting plate through a rotating shaft The mounting plate is fixed on the crossbeam of the frame of the PC sheet production line, the free end of the pressure arm is downward, and a pressure roller is installed on the free end. The piston rod of the cylinder is hinged to the free end of the pressure arm, and the cylinder housing is fixed to the crossbeam through a hinge seat. One end of the rotating shaft extends out of the mounting plate, and a large sprocket is fixed circumferentially. A sprocket shaft is slidably matched with the rotating shaft through a bearing on the mounting plate, and a small sprocket is fixed circumferentially at one end of the sprocket shaft, and a chain is arranged between the large sprocket and the small sprocket to transmit power. The other end of the sprocket shaft is fixedly connected to an angle sensor, and the transmission signal is fed back to the thickness gauge through the angle sensor.

[0005] A tensioning mechanism is provided between the chains, and the tensioning mechanism includes a bearing and a slide plate for tensioning the chain. The bearing is fitted on the slide plate through a fixed axis. A strip hole is provided on the slide plate, and the slide plate is connected and fixed to the mounting plate by screws passing through the strip hole.

[0006] A cover is fixedly mounted on the mounting plate, and the cover covers the large sprocket and the small sprocket.

[0007] The pressure of the cylinder in the working state is the same as the atmospheric pressure.

[0008] The transmission ratio of the large sprocket to the small sprocket is 10:3.

[0009] The above technical solution is adopted: the thickness change monitoring device includes a pressure arm, a pressure roller, and a cylinder. The fixed end of the pressure arm is hinged on a mounting plate through a rotating shaft, and the pressure roller is installed on the free end of the pressure arm. The piston rod of the cylinder is hinged to the free end of the pressure arm. Under the action of the cylinder, after the pressure roller presses the PC sheet, it relies on its own gravity to keep pressing on the PC sheet. As the PC sheet moves, once the deformed part on the PC sheet contacts the pressure roller, the pressure roller will be lifted upward, thereby driving the pressure arm to lift upward. One end of the rotating shaft extends out of the mounting plate, and a large sprocket is fixed circumferentially. When the pressure arm is lifted upward, the large sprocket will be driven to rotate through the rotating shaft. A sprocket shaft is slidably matched with a bearing on the mounting plate, which is biased from the rotating shaft. A small sprocket is fixed to one end of the sprocket shaft in the circumferential direction. A chain is arranged between the large sprocket and the small sprocket to transmit power. The rotation of the large sprocket drives the small sprocket through the chain. The rotation speed of the small sprocket is greater than that of the large sprocket, so that the rotation signal transmitted from the pressure roller to the small sprocket is amplified. Even if the pressure roller rotates very slightly, the signal can be amplified through the transmission between the large sprocket and the small sprocket. The other end of the sprocket shaft is fixedly connected to an angle sensor. The transmission signal amplified by the small sprocket is transmitted to the angle sensor through the sprocket shaft. The angle sensor can calculate the distance that the pressure roller is lifted and moved upward, so that the transmission signal is fed back to the thickness gauge through the angle sensor. Since the thickness change monitoring device is installed on the PC sheet production line and is located in front of the thickness gauge, when the thickness gauge receives the feedback signal from the angle sensor, the probe that reciprocates left and right can be moved to one end of the thickness gauge to prevent the probe from colliding with the deformed part of the PC sheet and damaging the probe. When the deformed part of the PC sheet leaves the pressure roller, the pressure roller presses on the PC sheet again by gravity, and continues to monitor the PC sheet in real time. After the PC sheet passes through the thickness change monitoring device, it moves to the detection port of the thickness gauge, and the thickness of the passing PC sheet is detected by the left and right reciprocating motion of the probe. The thickness deviation detected by the thickness gauge is used to feed back to the automatic mold.

[0010] A tensioning mechanism is provided between the chains, and the tensioning mechanism includes a bearing and a slide plate for tensioning the chain. The bearing is fitted on the slide plate through a fixed shaft, and a strip hole is provided on the slide plate. The slide plate is connected and fixed to the mounting plate through a screw passing through the strip hole. The tensioning mechanism is provided between the chains to ensure the pre-tension of the chain, prevent the chain from slipping, and ensure the transmission between the large sprocket and the small sprocket.

[0011] A cover is fixedly mounted on the mounting plate, and the cover covers the large sprocket and the small sprocket to protect the large sprocket and the small sprocket.

[0012] The pressure of the cylinder is the same as the atmospheric pressure when in working state, so as to avoid the influence of the air pressure of the cylinder on the rotation of the pressing roller, and ensure that the pressing roller can also rotate slightly when encountering slight deformation of the PC sheet.

[0013] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 It is a front view of the thickness change monitoring device of the present invention;

[0016] Figure 3 It is a side view of the thickness change monitoring device of the present invention.

[0017] In the accompanying drawings, 1 is a thickness gauge, 1-1 is a detection port, 2 is a thickness change monitoring device, 3 is a pressure arm, 4 is a pressure roller, 5 is a cylinder, 6 is a rotating shaft, 7 is a mounting plate, 7-1 is a cover, 8 is a crossbeam, 9 is a hinged seat, 10 is a large sprocket, 11 is a sprocket shaft, 12 is a small sprocket, 13 is a chain, 13-1 is a bearing, 13-2 is a slide plate, 13-3 is a strip hole, 13-4 is a screw, 14 is an angle sensor, and 15 is a roller. DETAILED DESCRIPTION

[0018] See also Figures 1 to 3An online thickness measurement system for ultra-wide PC sheets includes a thickness gauge 1 and a thickness change monitoring device 2. The thickness gauge 1 is installed on a PC sheet production line. The thickness gauge 1 is provided with a probe for detecting the thickness of the PC sheet. The probe is located in a detection port 1-1 set on the thickness gauge 1 for the PC sheet to pass through. The PC sheet passing through is detected by the left and right reciprocating motion of the probe. The thickness gauge 1 feeds back the thickness deviation of the PC sheet detected by the probe scanning to the automatic mold, so that the automatic mold automatically adjusts the extrusion thickness of the raw material. The thickness change monitoring device 2 includes a pressing arm 3, a pressing roller 4, and a cylinder 5. The fixed end of the pressing arm 3 is hinged on a mounting plate 7 through a rotating shaft 6, and the mounting plate 7 is fixed on a crossbeam 8 of a frame of a PC sheet production line. The free end of the pressing arm 3 is downward, and a pressing roller 4 is mounted on the free end. The piston rod of the cylinder 5 is hinged to the free end of the pressing arm 3, and the shell of the cylinder 5 is fixed on the crossbeam 8 through a hinge seat 9. Under the action of the cylinder 5, the pressing roller 4 is pressed on one side of the PC sheet, and the other side of the PC sheet is supported by a group of rollers 15. Since the pressure of the cylinder 5 is the same as the atmospheric pressure when in a working state, the pressing roller 4 is pressed on the PC sheet by its own gravity. Once the pressing roller 4 contacts the deformed part on the PC sheet, the deformed part will cause the pressing roller 4 to move upward, thereby driving the free end of the pressing arm 3 to lift upward. Since the fixed end of the pressing arm 3 is hinged on the mounting plate 7 through the rotating shaft 6, the lifting of the pressing arm 3 will cause the rotating shaft 6 to rotate. One end of the rotating shaft 6 extends out of the mounting plate 7, and a large sprocket 10 is fixed circumferentially, and the rotating rotating shaft 6 can drive the large sprocket 10 to rotate. A sprocket shaft 11 is slidably matched with the rotating shaft 6 through a bearing on the mounting plate 7, and a small sprocket 12 is fixed circumferentially at one end of the sprocket shaft 11. A chain 13 is arranged between the large sprocket 10 and the small sprocket 12 to transmit power. The rotating large sprocket 10 drives the small sprocket 12 to rotate through the chain 13, and the speed transmitted to the small sprocket 12 is much greater than the speed of the large sprocket 10, so that the signal of the rotation of the pressure roller 4 is amplified through the small sprocket 12. Even if the pressure roller 4 rotates slightly, the rotation signal can be amplified through the transmission of the large sprocket 10 and the small sprocket 12. The transmission ratio of the large sprocket 10 to the small sprocket 12 is 10:3, which ensures that the small sprocket 12 can amplify the rotation signal of the large sprocket 10 to a sufficient multiple so that the sensor can recognize it. The other end of the sprocket shaft 11 is fixedly connected to an angle sensor 14. The angle sensor 14 and the thickness gauge 1 can be connected by electrical connection or wireless signal connection, so that the angle sensor 14 feeds back the transmission signal to the thickness gauge 1. The transmission signal amplified by the small sprocket 12 is transmitted to the angle sensor 14 through the sprocket shaft 11. The angle sensor 14 can calculate the upward movement distance of the pressure roller 4, and then the transmission signal is fed back to the thickness gauge 1 through the angle sensor 14.The thickness change monitoring device 2 is installed on the PC sheet production line and is located in front of the thickness gauge 1. The formed PC sheet is first judged by the thickness change monitoring device 2 whether it is deformed, and then moved to the detection port 1-1 of the thickness gauge 1. The probe in the detection port 1-1 scans and detects the PC sheet. When the PC sheet is deformed, the thickness gauge 1 receives the feedback signal from the angle sensor 14, so that the probe can avoid the deformed part of the PC sheet in time to avoid damage to the probe due to collision with the deformed part.

[0019] A tensioning mechanism is arranged between the chains 13, and the tensioning mechanism comprises a bearing 13-1 and a slide plate 13-2 for tensioning the chain 13. The bearing 13-1 is matched on the slide plate 13-2 through a fixed axis. The slide plate 13-2 is provided with a strip hole 13-3. The slide plate 13-2 is connected and fixed to the mounting plate 7 through a screw 13-4 passing through the strip hole 13-3. The tensioning mechanism is arranged between the chains 13 to ensure the pre-tension of the chain 13, prevent the chain 13 from slipping, and ensure the effective transmission between the large sprocket 10 and the small sprocket 12. When it is necessary to adjust the tensioning degree of the tensioning mechanism and the chain 13, it is only necessary to screw the screw 13-4 out of the mounting plate 7 for a distance, and then the position of the screw 13-4 in the strip hole 13-3 can be changed by sliding the slide plate 13-2, and then the screw 13-4 can be tightened to change the tensioning force between the bearing 13-1 and the chain 13. The tensioning mechanism is simple in structure and very convenient to operate. A cover 7 - 1 is fixedly mounted on the mounting plate 7 , and the cover 7 - 1 and the mounting plate 7 can be connected by bolts. The cover 7 - 1 covers the large sprocket 10 and the small sprocket 12 , and plays a protective role for the large sprocket 10 and the small sprocket 12 .

[0020] When using the present invention, before production, first, the pressure roller 4 is lifted to a height that does not touch the PC sheet by the air cylinder 5, and the probe of the thickness gauge 1 is located at one end of the thickness gauge 1 and does not perform scanning movement; after the PC sheet is flat and deformed after the initial operation, the pressure roller 4 is pressed on both sides of the PC sheet respectively under the action of the air cylinder 5 and the supporting roller 15, and then the air cylinder 5 is cut off and is in a normal pressure state, and the pressure roller 4 is pressed on the PC sheet by its own gravity, and the probe of the thickness gauge 1 reciprocates left and right to scan the PC sheet for thickness detection; when the PC sheet is deformed, since the supporting roller 15 is fixed, the deformed part moves to the position of the pressure roller 4, which will lift the pressure roller 4 upward, and then the slight deformation of the pressure roller 4 is measured by the pressure arm 3. The rotation is transmitted to the large sprocket 10, which then drives the small sprocket 12 to rotate through the chain 13, thereby amplifying the rotation signal through the small sprocket 12, and the sprocket shaft 11 rotating with the small sprocket 12 feeds back the amplified signal to the angle sensor 14, which calculates the distance that the pressure roller 4 is lifted upward and feeds back the signal to the thickness gauge 1. Since the distance between the probe of the thickness gauge 1 and the PC sheet is very small, the thickness gauge 1 can judge whether to make an evasive action according to the signal size fed back by the angle sensor 14. If the deformed part is large, the probe of the thickness gauge 1 quickly moves to one end of the thickness gauge 1, temporarily stops moving and scanning, and avoids collision between the probe and the deformed part of the sheet until the deformed part leaves the thickness gauge 1. When the deformed part of the PC sheet leaves from under the pressure roller 4, the pressure roller 4 presses on the PC sheet again by gravity, and continues to monitor the PC sheet in real time.

[0021] In the PC sheet production line, the thickness gauge 1 of the present invention can detect the thickness of the sheet online, and the detection data is used to feed back to the automatic mold, so that the automatic mold can adjust the extrusion amount of the raw material in time. It has a high degree of automation, high production efficiency, and can greatly reduce the scrap rate. In the production of PC sheets, it is inevitable that wavy deformation will occur. The deformed part has high hardness and strength. The distance between the probe of the thickness gauge 1 and the PC sheet is very small, and the probe is expensive. The thickness change monitoring device 2 of the present invention can monitor the thickness of the PC sheet in real time, avoid the collision between the probe of the thickness gauge 1 and the deformed part of the PC sheet, and play a role in protecting the thickness gauge 1. In addition, the present invention can be applied to various sheet production lines, has a wide range of applications, and can greatly reduce labor costs and improve production efficiency.

Claims

1. An online thickness measurement system for ultra-wide PC sheets, characterized by: The invention comprises a thickness gauge (1) and a thickness change monitoring device (2). The thickness gauge (1) is installed on a PC sheet production line. The thickness gauge (1) is provided with a probe for detecting the thickness of the PC sheet. The probe is located in a detection port (1-1) provided on the thickness gauge (1) for allowing the PC sheet to pass through. The probe reciprocates left and right to detect the PC sheet passing through. The thickness change monitoring device (2) is installed on the PC sheet production line and is located in front of the thickness gauge (1). The thickness change monitoring device (2) comprises a pressing arm (3), a pressing roller (4), and a cylinder (5). The pressing arm The fixed end of the pressure arm (3) is hinged to a mounting plate (7) through a rotating shaft (6), and the mounting plate (7) is fixed to a crossbeam (8) of a frame of a PC sheet production line. The free end of the pressure arm (3) is downwardly facing, and a pressure roller (4) is installed on the free end. The piston rod of the cylinder (5) is hinged to the free end of the pressure arm (3), and the housing of the cylinder (5) is fixed to the crossbeam (8) through a hinge seat (9). When the cylinder (5) is in a working state, the pressure is the same as the atmospheric pressure. One end of the rotating shaft (6) extends out of the mounting plate (7), and a large sprocket (10) is fixed in the circumferential direction. The mounting plate (7) is biased toward The rotating shaft (6) is slidably matched with a sprocket shaft (11) through a bearing, a small sprocket (12) is circumferentially fixed to one end of the sprocket shaft (11), a chain (13) is arranged between the large sprocket (10) and the small sprocket (12) to transmit power, a tensioning mechanism is arranged between the chains (13), the tensioning mechanism comprises a bearing (13-1) for tensioning the chain, and a slide plate (13-2), the bearing (13-1) is matched with the slide plate (13-2) through a fixed axis, the slide plate (13-2) is provided with a strip hole (13-3), and the slide plate (13-2) is screwed (13-4) passes through the strip hole (13-3) and is connected and fixed to the mounting plate (7), and the other end of the sprocket shaft (11) is fixedly connected to an angle sensor (14), and the transmission signal is fed back to the thickness gauge (1) through the angle sensor (14); when in use, the pressure roller (4) is pressed on both sides of the PC sheet respectively under the action of the cylinder (5) and the supporting roller (15), and then the cylinder (5) is cut off and is in a normal pressure state. The pressure roller (4) is pressed on the PC sheet by its own gravity, and the probe of the thickness gauge (1) reciprocates left and right to scan the PC sheet for thickness detection;When the PC sheet is deformed, the deformed portion moves to the position of the pressure roller (4), causing the pressure roller (4) to lift upward, and then the pressure arm (3) transmits the slight rotation of the pressure roller (4) to the large sprocket (10), and the large sprocket (10) drives the small sprocket (12) to rotate through the chain (13), thereby amplifying the rotation signal through the small sprocket (12), and the sprocket shaft (11) rotating with the small sprocket (12) feeds back the amplified signal to the angle sensor (14), and the angle sensor (14) calculates the distance that the pressure roller (4) is lifted upward, and feeds back the signal to the thickness gauge (1). If the deformed portion is large, the probe of the thickness gauge (1) quickly moves to one end of the thickness gauge (1), temporarily stops moving and scanning, and avoids collision between the probe and the deformed portion of the sheet, until the deformed portion leaves the thickness gauge (1); when the deformed portion of the PC sheet leaves from under the pressure roller (4), the pressure roller 4 presses on the PC sheet again by gravity, and continues to monitor the PC sheet in real time. ; 2. The online thickness measurement system for ultra-wide PC sheets according to claim 1 is characterized in that: A cover (7-1) is fixedly mounted on the mounting plate (7), and the cover (7-1) covers the large sprocket (10) and the small sprocket (12).

3. The online thickness measurement system for ultra-wide PC sheets according to claim 1 is characterized in that: The transmission ratio between the large sprocket (10) and the small sprocket (12) is 10:3.

Images