CN110726371A

CN110726371A - SMC sheet thickness detection device

Info

Publication number: CN110726371A
Application number: CN201911156384.5A
Authority: CN
Inventors: 孙志斌; 叶才云; 陈国兵; 金建农; 徐雷
Original assignee: Changzhou Huari New Material Co Ltd
Current assignee: Changzhou Huari New Material Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-01-24

Abstract

The invention discloses an SMC sheet thickness detection device, which comprises a conveyor belt, an SMC sheet positioned on the conveyor belt, a suspension, a lever bracket, a roller and a displacement sensor, wherein the suspension is arranged on the SMC sheet; the suspension is located above the SMC sheet, the lever support is rotatably connected to the suspension through a rotating shaft which is horizontally arranged, the lever support comprises a sinking end close to the rotating shaft and a tilting end far away from the rotating shaft, the roller is arranged at the sinking end of the lever support, the displacement sensor is arranged at the tilting end of the lever support or is in contact with the tilting end of the lever support, and the displacement sensor is a linear displacement sensor and is used for detecting the rising and falling amplitude of the tilting end; the rollers are parallel to the conveyor belt and contact the upper surface of the SMC sheet. The SMC sheet thickness detection device can detect the thickness of the sheet in real time quickly and accurately by contact.

Description

SMC sheet thickness detection device

Technical Field

The invention relates to a device for detecting the thickness of an SMC sheet in a production process in real time, and belongs to the technical field of measurement.

Background

SMC (Sheet Molding Compound, SMC for short) is a novel thermosetting glass fiber reinforced plastic Molding material, and is a Sheet film plastic prepared by impregnating chopped fiber untwisted roving with unsaturated polyester resin paste containing components such as thickening agent, low-shrinkage additive, filler, parting agent, colorant and the like. The SMC material has excellent electrical insulation performance, mechanical performance, thermal stability and chemical corrosion resistance. Therefore, the SMC product has a wide application range and is mainly applied to the fields of electric industry, automobile industry, railway vehicles, communication engineering, explosion-proof electrical equipment shells and the like. SMC first appeared in Europe in the early sixties of the twentieth century, and around 1965, the technology was developed in the United states, Japan and other countries, and in the late eighties of the twentieth century, foreign advanced SMC production lines and production technologies were introduced, and then SMC production equipment was developed autonomously. After decades of continuous development, domestic SMC technology and technology are mature at present, and some products and technologies approach or reach the foreign advanced technical level.

The thickness of the SMC sheet in the production process is an important factor influencing the quality of the SMC sheet, and the thickness of the sheet is not uniform due to the irregular distribution of chopped glass fibers in the SMC sheet, so that most of SMC sheet production equipment does not detect the thickness of the sheet in the production process at present. Chinese patent document CN206733642U (application number: 201720557276.9) discloses an SMC sheet machine that does not detect sheet thickness. Chinese patent document CN208084776U (application number: 201820359349.8) discloses an on-line detection mechanism for thickness of resin paste on SMC sheet, comprising at least one set of sensor units, each sensor unit comprises a first laser displacement sensor and a second laser displacement sensor, and is correspondingly arranged on the upper and lower sides of the film coated with resin paste after the glue tank and before the yarn cutter, and the device can measure and adjust the thickness of resin paste in SMC sheet production process in real time and on line. However, detection with laser is susceptible to SMC resin transparency and glass fibers, resulting in inaccurate detection.

Disclosure of Invention

The invention aims to solve the technical problem of providing an SMC sheet thickness detection device which can detect the thickness of a sheet in real time quickly and accurately by contact.

The invention provides the following technical scheme for solving the technical problems: the SMC sheet thickness detection device comprises a conveyor belt, an SMC sheet positioned on the conveyor belt, a suspension, a lever bracket, a roller and a displacement sensor, wherein the conveyor belt is provided with a plurality of rollers; the suspension is located above the SMC sheet, the lever support is rotatably connected to the suspension through a rotating shaft which is horizontally arranged, the lever support comprises a sinking end close to the rotating shaft and a tilting end far away from the rotating shaft, the roller is arranged at the sinking end of the lever support, the displacement sensor is arranged at the tilting end of the lever support or is in contact with the tilting end of the lever support, and the displacement sensor is a linear displacement sensor and is used for detecting the lifting amplitude of the tilting end; the rollers are parallel to the conveyor belt and contact the upper surface of the SMC sheet.

In order to make the roller lift with the thickness of the SMC sheet, a preferable technical proposal is that: the pressure of the above-mentioned roller against the SMC sheet is 5N to 20N. The self weight of control cylinder and lever support can be so that the lever support sinks the weight relative balance of end and perk end, and the pressure that the cylinder pressed on the SMC sheet is too big, can cause the cylinder to thin the SMC sheet, and pressure is too little, can cause the cylinder to bounce and lead to measuring inaccurate.

The axial direction of the roller is vertical to the moving direction of the conveyor belt.

In order to make the rotation of the roller smoother, a preferred technical scheme is as follows: the rotary shaft of the rotary drum is rotatably connected to the sinking end of the lever bracket through a bearing pair.

In order to conveniently control the relative balance of the weights of the sinking end and the tilting end of the lever bracket, a preferred technical scheme is as follows: the lever bracket is provided with a balancing weight. The balancing weight can be configured flexibly, the design difficulty of the lever bracket is reduced, and the pressure of the roller pressing on the SMC sheet is further ensured to be neither too large nor too small.

A preferred technical scheme for setting the balancing weight is as follows: the balancing weight is arranged at the tilting end of the lever bracket.

Another preferable technical scheme for setting the balancing weight is as follows: the counterweight blocks are divided into two groups, and each group of counterweight blocks is connected to one side of the lever bracket in a sliding manner and is positioned between the rotating shaft and the tilting end.

In order to amplify the lifting amplitude of the roller and improve the measurement accuracy, a preferred technical scheme is as follows: the distance between the displacement sensor and the rotating shaft is 2 to 10 times of the distance between the roller and the rotating shaft.

In order to realize the automatic control of the thickness of the sheet material in the production process of the SMC sheet material, a preferable technical scheme is as follows: the SMC sheet thickness detection device also comprises a driving mechanism, a resin bin and a baffle; the actuating mechanism includes main control chip and drive unit, main control chip's signal input part is connected with the displacement sensor electricity, main control chip's signal output part is connected with drive unit's the control unit electricity, and the bottom of resin feed bin is equipped with the discharge gate, the baffle is located discharge gate one side, drive unit is used for controlling the lift of baffle, drive unit is motor, cylinder or pneumatic cylinder.

The invention has the positive effects that: the SMC sheet thickness detection device detects the real-time thickness of the SMC sheet in the production process by lightly touching the upper surface of the SMC sheet by the roller and measuring the ascending and descending amplitude of the roller. When the thickness of the SMC sheet changes, the roller can rise or fall, the lever support amplifies the rising or falling amplitude, and the displacement sensor detects the displacement to obtain the thickness change data of the SMC sheet. The SMC sheet thickness detection device is additionally arranged on the existing SMC sheet production equipment.

Drawings

The SMC sheet thickness detecting device of the present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of an SMC sheet thickness detection apparatus according to embodiment 1 of the present invention;

FIG. 2 is a schematic diagram of the contact detection mechanism of FIG. 1;

FIG. 3 is a top view of the contact detection mechanism of FIG. 2;

FIG. 4 is a schematic structural view of a contact detecting mechanism according to embodiment 2 of the present invention;

fig. 5 is a schematic structural view of a contact detection mechanism according to embodiment 3 of the present invention.

The above reference numerals are as follows:

conveyer belt 1, SMC sheet 2, lever bracket 3, sunken end 31, stick up end 32, pivot 33, cylinder 4, displacement sensor 5, balancing weight 6, actuating mechanism 7, suspension 8, resin feed bin 91, discharge gate 911, baffle 92, fibre feed bin 93.

Detailed Description

Example 1

Referring to fig. 1 to 3, the SMC sheet thickness detecting device of the present embodiment includes a conveyor belt 1, an SMC sheet 2 placed on the conveyor belt 1, a suspension 8, a lever bracket 3, a drum 4, a displacement sensor 5, a driving mechanism 7, a resin bin 91, a baffle 92, and a fiber bin 93. The lever bracket 3, the roller 4 and the displacement sensor 5 constitute a contact type detection mechanism.

The SMC sheet 2 is located on the conveyor belt 1. The SMC sheet 2 is composed of an upper film, a lower film, and an intermediate resin layer. The lower film moves along with the conveyor belt 1, the bottom of the resin bin 91 is provided with a discharge hole 911, the resin in the resin bin 91 falls onto the lower film from the discharge hole 91, then the chopped glass fibers in the fiber bin 93 fall onto the lower film, and then the upper film covers the resin layer to form the SMC sheet 2.

The suspension 8 is located above the SMC sheet 2, the lever bracket 3 is rotatably connected to the suspension 8 by a horizontally disposed rotating shaft 33, and the lever bracket 3 includes a sinking end 31 close to the rotating shaft 33 and a tilting end 32 far from the rotating shaft 33. The roller rotating shaft of the roller 4 is rotatably connected to the sinking end 31 of the lever bracket 3 through a bearing pair. The roller 4 is parallel to the conveyor belt 1 and is in contact with the upper surface of the SMC sheet 2. The axial direction of the rollers 4 is perpendicular to the direction of movement of the conveyor belt 1. The pressure of the cylinder 4 against the SMC sheet 2 is 10N.

The displacement sensor 5 is a contact type linear displacement sensor (model: GT2, yolkhead), and the displacement sensor 5 is fixed on the frame, and the contact end of the displacement sensor is in contact with the tilting end 32 of the lever bracket 3. The displacement sensor 5 is used for detecting the lifting amplitude of the tilting end 32. The distance from the displacement sensor 5 to the rotating shaft 33 is 4 times the distance from the drum 4 to the rotating shaft 33.

The lever bracket 3 is provided with a balancing weight 6. There are two groups of counterweight blocks 6, and each group of counterweight blocks 6 is connected to one side of the lever bracket 3 in a sliding way and is positioned between the rotating shaft 33 and the tilting end 32.

The driving mechanism 7 comprises a main control chip and a driving unit, a signal input end of the main control chip is electrically connected with the displacement sensor 5, a signal output end of the main control chip is electrically connected with a control unit of the driving unit, and the driving unit is used for controlling the lifting of the baffle 92 so as to control the opening height of the discharge hole 911.

The driving mechanism 7 comprises a main control chip and a driving unit, a signal input end of the main control chip is electrically connected with the displacement sensor 5, a signal output end of the main control chip is electrically connected with a control unit of the driving unit, the baffle 92 is arranged on one side of the discharge hole 911, and the driving unit is used for controlling the baffle 92 to lift. The drive unit is a motor.

The SMC sheet thickness detecting device of the present embodiment is an add-on device of an SMC sheet machine, and the specific structure of the SMC sheet machine is described in chinese patent document CN 206733642U.

The SMC sheet thickness detection device of this embodiment is when using, cylinder 4 rolls along with the motion of SMC sheet 2, when SMC sheet 2's thickness changes, displacement about cylinder 4 takes place, according to lever principle, lever bracket 3 enlargies the displacement volume of cylinder 4, the magnification is 4 times, displacement sensor 5 detects the displacement volume after enlargiing, then through the lift of main control chip control motor control baffle 92, thereby adjust the height of discharge gate 911, through the position of adjusting balancing weight 6, can guarantee that cylinder 4 is about 10N to SMC sheet 2's pressure.

Example 2

Referring to fig. 4, the SMC sheet thickness detecting device of the present embodiment is the same as embodiment 1 except that: the balancing weight 6 is arranged at the tilting end 32 of the lever bracket 3.

Example 3

Referring to fig. 5, the SMC sheet thickness detecting device of the present embodiment is the same as embodiment 1 except that: the displacement sensor 5 is a laser displacement sensor (brand: miyidium, model: optoNCDT 1420), the displacement sensor 5 is arranged at the tilting end 32 of the lever bracket 3, the laser displacement sensor can freely rotate relative to the tilting end 32, the laser emitting end of the laser displacement sensor is always vertically downward under the action of gravity, and a laser beam irradiates on a static reference object.

Example 4

The SMC sheet thickness detecting device of the present embodiment is the same as that of embodiment 3 except that: the displacement sensor 5 is fixed at the tilting end 32 of the lever bracket 3, and the laser irradiation track of the laser displacement sensor needs to be converted because the laser displacement sensor rotates along with the lever bracket 3.

It should be understood that the above-described embodiments are merely examples provided for clearly illustrating the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And such obvious variations or modifications which fall within the spirit of the invention are intended to be covered by the scope of the present invention.

Claims

1. An SMC sheet thickness detection device, comprising a conveyor belt (1) and an SMC sheet (2) positioned on the conveyor belt (1), characterized in that: the device also comprises a suspension (8), a lever bracket (3), a roller (4) and a displacement sensor (5); the suspension (8) is located above the SMC sheet (2), the lever support (3) is rotatably connected to the suspension (8) through a rotating shaft (33) horizontally arranged, the lever support (3) comprises a sinking end (31) close to the rotating shaft (33) and a tilting end (32) far away from the rotating shaft (33), the roller (4) is arranged at the sinking end (31) of the lever support (3), the displacement sensor (5) is a linear displacement sensor, and the displacement sensor (5) is arranged at the tilting end (32) of the lever support (3) or is in contact with the tilting end (32) of the lever support (3); the roller (4) is parallel to the conveyor belt (1) and is in contact with the upper surface of the SMC sheet (2).

2. An SMC sheet thickness detecting device as in claim 1, wherein: the pressure of the drum (4) against the SMC sheet (2) is between 5N and 20N.

3. An SMC sheet thickness detecting device as in claim 2, wherein: the axial direction of the roller (4) is vertical to the moving direction of the conveyor belt (1).

4. An SMC sheet thickness detecting device according to claim 3, wherein: and a rotary drum rotating shaft of the rotary drum (4) is rotatably connected to the sinking end (31) of the lever bracket (3) through a bearing pair.

5. An SMC sheet thickness detecting device as in claim 2, wherein: and a balancing weight (6) is arranged on the lever bracket (3).

6. An SMC sheet thickness detecting device according to claim 5, wherein: the balancing weight (6) is arranged at the tilting end (32) of the lever bracket (3).

7. An SMC sheet thickness detecting device according to claim 5, wherein: there are two groups of balancing weights (6), and each group of balancing weights (6) is connected to one side of the lever bracket (3) in a sliding manner and is positioned between the rotating shaft (33) and the tilting end (32).

8. An SMC sheet thickness detecting device as in claim 2, wherein: the distance from the displacement sensor (5) to the rotating shaft (33) is 2 to 10 times of the distance from the roller (4) to the rotating shaft (33).

9. An SMC sheet thickness detecting device according to any of claims 1 to 8, characterized in that: the device also comprises a driving mechanism (7), a resin bin (91) and a baffle (92); actuating mechanism (7) include main control chip and drive unit, main control chip's signal input part is connected with displacement sensor (5) electricity, main control chip's signal output part is connected with drive unit's the control unit electricity, and the bottom of resin feed bin (91) is equipped with discharge gate (911), baffle (92) are located discharge gate (911) one side, drive unit is used for controlling the lift of baffle (92).

10. An SMC sheet thickness detecting device as in claim 9, wherein: the driving unit is a motor, a cylinder or a hydraulic cylinder.