CN117124453A - Accurate control mechanism for powder thickness and control method thereof - Google Patents

Abstract

The invention relates to a powder thickness accurate control mechanism and a control method thereof. The accurate powder thickness control mechanism consists of a conveying belt, thickness detection mechanisms, scraping plate mechanisms and a control system, wherein the thickness detection mechanisms, the scraping plate mechanisms and the control system are respectively vertically arranged above the conveying belt in a riding mode and are fixedly arranged on two sides of the conveying belt through fixing elements. The control method comprises the following steps: the method comprises the steps of setting the thickness of powder, driving servo motors of a first lifting mechanism and a second lifting mechanism, driving a speed reducer, enabling a guide post embedded at the output shaft end of the speed reducer to move along with the speed reducer, enabling the lower end of a screw rod to move vertically along with the guide post under the action of a locating pin, and then driving the whole scraper mechanism to move vertically until the thickness of the set powder is reached; the thickness of powder is read through the first laser ranging sensor and the second laser ranging sensor at the two ends of the thickness detection mechanism, and the thickness is fed back to the PLC controller to instruct the scraper mechanism to adjust in real time, so that stable and accurate control is realized.

Description

Accurate control mechanism for powder thickness and control method thereof

Technical Field

The invention belongs to the technical field of ceramic tile production, and particularly relates to a powder thickness accurate control mechanism and a control method thereof.

Background

In the field of ceramic tile production, powder compression molding is an important process. In the ceramic press material distribution process, material distribution control is very important, but material distribution is influenced by a plurality of factors, and control accuracy is difficult to achieve very high due to a plurality of interference factors. In daily production, the adjustment of ceramic green brick thickness, or in order to deal with the local thickness variation of green brick after compression molding that is influenced by fluctuation variation of factors such as powder humidity, grain composition, etc., when powder fills into the mould, uneven distribution easily appears, some places are thin, some places are thick, especially at the two ends of the mould, the possible thick places are up to 2 to 3 times of normal distribution thickness, or stacking phenomenon appears at corners. In this regard, the common practice in the industry is to adjust the thickness of the pressed green brick by manually adjusting the thickness of the cloth according to the performance of the powder, and in addition, the thickness of each part of the pressed green brick needs to be measured, and then local cloth adjustment is performed according to the thickness results of different parts of the product, but the manual adjustment of the cloth often causes uncertainty in thickness adjustment, and the manual adjustment is difficult to achieve timely for the first time, so that instability of production can be caused, the phenomenon of excessive thickness or excessive thinness of the product occurs, a large amount of degraded products, even waste products can be brought for a long time, and meanwhile, the monitoring and constant control of the thickness of the cloth powder in the continuous green brick molding production process are also lacking at present, so that the problem of single-side thickness deviation or thinness of the product occurs in actual production.

Disclosure of Invention

Aiming at the problems, the invention aims to provide a precise control mechanism for powder thickness, which is used for solving the problem of unstable product thickness control caused by manual adjustment of powder thickness. Another object of the present invention is to provide a control method of a precise control mechanism that can continuously monitor the thickness variation of the powder and automatically adjust the thickness of the powder.

The technical scheme of the invention is that the accurate powder thickness control mechanism is characterized by comprising a conveying belt, thickness detection mechanisms, scraper mechanisms and a control system, wherein the thickness detection mechanisms are respectively vertically ridden over the conveying belt and are fixedly arranged on two sides of the conveying belt by fixing elements.

As preferable: the thickness detection mechanism consists of a section bar, a pair of L-shaped supporting plates, adjacent to the section bar side edges of the top plate part, and a pair of laser ranging sensors, wherein the L-shaped supporting plates are opposite to each other, and the L-shaped supporting plates are respectively and vertically fixed on two sides of the section bar, and the pair of laser ranging sensors are respectively and fixedly arranged on the side edges of the section bar adjacent to the top plate part.

As preferable: the scraping plate mechanism consists of a section bar, scraping plates fixedly arranged on the side edges of the section bar, a pair of lifting mechanisms which are vertically connected with two ends of the section bar through section bar fixing plates and fixedly arranged on the top of the foot rest through fixing elements, and the foot rest fixedly arranged on the bottom of the lifting mechanism through the fixing plates and the fixing elements.

As preferable: the lifting mechanism is composed of a first L-shaped fixing plate, a U-shaped fixing plate and a long plate, wherein the first L-shaped fixing plate, the U-shaped fixing plate and the long plate are vertically connected with the bottom of the long plate, a speed reducer and a servo motor for driving the speed reducer, a guide post penetrating through an output shaft of the speed reducer, a threaded hole formed in the middle of the guide post, a screw rod in the guide post in threaded connection, an air cylinder and a piston rod of the air cylinder are fixedly arranged on the inner side of a short plate at the top of the U-shaped fixing plate, a transverse plate, a longitudinal plate and a third L-shaped fixing plate, wherein the transverse plate is used for vertically penetrating through the speed reducer screw rod and the air cylinder piston rod, the longitudinal plate is used for being connected with the end of a section bar through fixing elements, the third L-shaped fixing plate is connected with the long plate of the first L-shaped fixing plate through fixing elements, and a strip-shaped mounting groove formed in the longitudinal plate parallel to the first L-shaped fixing plate is fixedly arranged on the longitudinal plate through the fixing elements, and a proximity switch electrically connected with a control system.

As preferable: the upper end of the screw rod is bolted with a third L-shaped section bar fixing plate through a screw cap; the outer surface of the guide post is provided with a key slot for installing a key pin, and the guide post is embedded into the output shaft end of the speed reducer through the key pin; the screw bottom is provided with a zero position identification electric eye for identifying and locking the screw zero position, and the zero position identification electric eye is electrically connected with the control system.

As preferable: the control system comprises a touch screen, a PLC (programmable logic controller), a laser thickness ranging sensor, a servo driver and a servo motor, wherein the PLC is used as a control core and is connected with the touch screen, the laser thickness ranging sensor and the servo driver through network cables for signal transmission; when the servo motor receives the driving signal of the servo driver, the speed reducer is driven, the guide post embedded at the output shaft end of the speed reducer moves along with the speed reducer, and the lower end of the screw rod moves along with the guide post in an up-down straight line under the action of the positioning pin.

The other technical proposal of the invention is a control method of the accurate control mechanism for powder thickness, which is characterized by comprising the following steps:

the method comprises the steps of setting the thickness of powder, driving servo motors of a first lifting mechanism and a second lifting mechanism, driving a speed reducer, enabling a guide post embedded at the output shaft end of the speed reducer to move along with the speed reducer, enabling the lower end of a screw rod to move vertically along with the guide post under the action of a locating pin, and then driving the whole scraper mechanism to move vertically until the thickness of the set powder is reached;

the thickness of powder is read through the first laser ranging sensor and the second laser ranging sensor at the two ends of the thickness detection mechanism, and the thickness is fed back to the PLC controller to instruct the scraper mechanism to adjust in real time, so that stable and accurate control is realized.

Compared with the prior art, the invention has the beneficial effects that:

the method reduces the probability of degrading the product due to overlarge product thickness deviation caused by manual measurement errors or untimely powder fluctuation in the previous working procedure, avoids production instability caused by manual operation, and ensures the quality of the blank pressing and molding semi-product.

The automatic control system is simple and convenient to operate, high in automation degree and capable of reducing labor intensity of staff.

Drawings

FIG. 1 is an isometric view of a powder thickness precision control mechanism of the present invention;

FIG. 2 is a schematic view of a thickness detection mechanism of the powder thickness precision control mechanism of the present invention;

FIG. 3 is a bottom view of the thickness detection mechanism of the accurate powder thickness control mechanism of the present invention;

FIG. 4 is an isometric view of a blade mechanism of the powder thickness precision control mechanism of the present invention;

FIG. 5 is an enlarged partial view of the portion I of FIG. 4;

FIG. 6 is a schematic view of the lifting mechanism of the thickness detection mechanism of FIG. 4;

FIG. 7 is an exploded view of the lifting mechanism of the thickness detection mechanism of FIG. 4;

FIG. 8 is an exploded view of the elevation mechanism of the thickness detection mechanism of FIG. 4 from a perspective;

FIG. 9 is an exploded view of the thickness detection mechanism of FIG. 4 from another perspective;

FIG. 10 is an enlarged partial view of the portion I of FIG. 9;

FIG. 11 is a schematic view of the guide post of the lifting mechanism of the thickness detection mechanism of FIG. 4;

FIG. 12 is a system block diagram of the accurate powder thickness control mechanism of the present invention;

FIG. 13 is a flow chart of the operation of the accurate powder thickness control mechanism of the present invention.

Description of main reference numerals:

conveyor belt 1	Thickness detection mechanism 2	Scraper mechanism 3
			7-shaped supporting plate 201	Bolt 202	Aluminum profile 203
Bolt 204	Fixing plate 205	Bolt 206
			Laser ranging sensor 207	Fixing plate 208	Bolt 209
Laser ranging sensor 210	Foot stool 301	Lifting mechanism 302
			Bolt 303	Aluminum profile 304	Bolt 305
Blade 306	Bolt 307	Lifting mechanism 308
			Foot stool 309	Zero electric eye device 310	Proximity switch 3101
Support 3102	Bolt 3103	Aluminum section bar fixing plate 30201
			Fixing nut 30202	Cylinder 30203	Bolt 30204
Fixing plate 30205	Bolt 30206	Screw 30207
			Speed reducer 30208	Servo motor 30209	Fixing plate 30210
Locating pin 30211	Guide post 30212	Key pin 30213
			Screw hole 30214	Key groove 30215

Detailed Description

The invention will be further described in detail below with reference to the accompanying drawings:

referring to fig. 1, the green brick thickness control mechanism of the present invention is composed of a conveyor belt 1, a thickness detection mechanism 2 and a scraper mechanism 3; for better illustration of the embodiment of the invention, it is defined that the conveyor belt 1 is driven by the motor with one side being the front and the other side being the rear, the conveyor belt 1 being used for conveying the powder from the rear to the front; with continued reference to fig. 1, the scraper mechanism 3 is mounted at the rear of the conveyor belt 1; the thickness detection mechanism 2 is arranged in front of the conveying belt; referring to fig. 2, the thickness detecting mechanism 2 is fixed above the conveyor belt 1 by bolts 202;

referring to fig. 2 and 3, the thickness detecting mechanism 2 is supported by two 7-shaped supporting plates 201 respectively arranged at two sides and fixed above the conveyor belt 1 by bolts 202, an aluminum profile 203 is arranged at the top of the 7-shaped supporting plates 201, and the 7-shaped supporting plates 201 and the aluminum profile 203 are fixed by screws 204; with continued reference to fig. 3, the thickness detection mechanism 2 is provided with a laser ranging sensor 207 and a laser ranging sensor 210, where the laser ranging sensor 207 is disposed on the fixing plate 205 and then fixed to one end of the aluminum profile 203 by a bolt 206; similarly, the laser ranging sensor 210 is arranged on the fixing plate 208 and is fixed at the other end of the aluminum profile 203 through a bolt 209;

referring to fig. 4, the scraper mechanism 3 is configured by a foot rest 301 and a foot rest 309 distributed on the left and right sides of the conveyor 1 to support the whole scraper mechanism 3; with continued reference to fig. 4, the lifting mechanism 302 is fixed above the stand 301 by bolts 303; similarly, the lifting mechanism 308 is fixed above the foot rest 309 through the zero electric eye mechanism 310; an aluminum profile 304 is arranged between the lifting mechanism 302 and the lifting mechanism 308, and is fixed through a bolt 305, a scraper 306 is arranged in front of the aluminum profile, and is fixed through a bolt 307;

both elevator mechanism 302 and elevator mechanism 308 are the mechanisms shown in fig. 6, and the following description will illustrate the symbol-mating relationship of the various components of elevator mechanism 302:

referring to fig. 6 and 7, the lifting mechanism 302 is provided with a fixing plate 30205 standing above the stand 301, a cylinder 30203 is arranged above the fixing plate through a bolt 30204, and a nut 30202 is connected above the cylinder 30203 in series to fix one end of the aluminum profile mounting plate 30201;

with continued reference to fig. 6, the lifting mechanism 302 has a fixing plate above the stand 301, and a screw hole above the fixing plate for fixing the speed reducer 30208, and the speed reducer 30208 is connected in series with the servo motor 30209 as a driving unit;

referring to fig. 7 and 8, an output shaft of the speed reducer 30208 is provided with a guide post 30212 in a penetrating manner; referring to fig. 9 and 10, a threaded hole 30214 is provided in the middle of the guide post 30212, and is used for connecting with a screw 30207, a positioning pin 30211 is transmitted to the lower end of the screw 30207, and is used for positioning the screw 30207 and making linear movement along the guide hole of the fixing plate 30205, and the upper end of the positioning screw 30207 is bolted to the fixing plate 30201 of the aluminum profile through a nut 30206; a key groove 30215 is formed in the outer surface of the guide post 30212 and used for installing a key pin 30213, and the guide post 30212 is embedded into the output shaft end of the speed reducer 30208 through the key pin 30213; referring to fig. 5 and 6, a zero electric eye mechanism 310 is further disposed at the bottom of the positioning screw 30207, for locking the zero position of the positioning screw 30207; the zero electric eye mechanism 310 is provided with a proximity switch 3101 penetrating between the brackets 3102 and fixed to the bottom of the lifting mechanism 302 by bolts 3103.

3. The control method is described in conjunction with a control flow chart:

referring to fig. 12, in order to implement the precise control of the present invention, the present invention includes a green brick thickness precise control system, including a touch screen, a PLC, a laser thickness sensor, a servo driver, etc., where the PLC is a control core, and is connected with each component through a network cable to perform signal transmission; the laser ranging sensors 207 and 210 at both ends of the thickness detection mechanism 2 correspond to the laser ranging sensor 1 and the laser ranging sensor 2 of fig. 12, respectively; the servo motor 30209 of the lifting mechanism 302 of the scraper corresponds to the servo motor 1 of fig. 12, while the servo motor of the lifting mechanism 308 corresponds to the servo motor 2 of fig. 12, and the lifting mechanism 302 and the lifting mechanism 308 are respectively arranged at two ends of the scraper to respectively control the heights of the two ends of the scraper, thereby controlling the thickness of two sides of the powder. Because the structure and the movement principle of the lifting mechanism 302 and the lifting mechanism 308 are the same, taking the lifting mechanism 302 as an example for illustration, the servo motor 30209 drives the speed reducer 30208 when receiving the driving signal of the servo driver 1, the guide post 30212 embedded at the output shaft end of the speed reducer 30208 moves along with the speed reducer, and the lower end of the screw 30207 moves vertically and linearly under the action of the positioning pin 30211;

please refer to fig. 12 and 13 for illustrating the control loop of the present invention: setting an initial height M1 of one end of the scraper through the touch screen, transmitting the initial height M1 to the PLC, and then transmitting an instruction to the servo driver 1 through the PLC, wherein the servo driver 1 drives the servo motor 1 again so as to control one end of the scraper to the set height; reading the height N1 of the powder through the laser thickness sensor 1, transmitting the powder to the PLC, comparing the thickness M1 of the powder with the height N1 read by the laser thickness sensor through the PLC, and if M1 is larger than N1, transmitting a command to the servo driver through the PLC to drive the servo motor to drive the scraper to continuously ascend until M1 is equal to N1; otherwise, if M1 is smaller than N1, the PLC sends an instruction to the servo driver to drive the motor to reversely move so as to drive the scraper to lower downwards until M1 is equal to N1; the other end of the scraper is executed according to the steps.

The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (7)

1. The accurate control mechanism of powder thickness is characterized by comprising a conveying belt, thickness detection mechanisms, scraper mechanisms and a control system, wherein the thickness detection mechanisms are respectively vertically ridden over the conveying belt and are fixedly arranged on two sides of the conveying belt by fixing elements.

2. The accurate powder thickness control mechanism according to claim 1, wherein the thickness detection mechanism comprises a profile, a pair of L-shaped support plates opposite to top plates respectively and vertically fixed on two sides of the profile, and a pair of laser ranging sensors respectively and fixedly arranged on side edges of the profile adjacent to the top plate.

3. The precise powder thickness control mechanism according to claim 1, wherein the scraping plate mechanism is composed of a section bar, scraping plates fixedly arranged on the side edges of the section bar, a pair of parallel lifting mechanisms vertically connected with two ends of the section bar through section bar fixing plates and fixedly arranged on the top of the foot rest through fixing elements, and a foot rest fixedly arranged on the bottom of the lifting mechanisms through the fixing plates and the fixing elements.

4. The powder thickness accurate control mechanism according to claim 3, wherein the lifting mechanism is composed of a first L-shaped fixing plate, a U-shaped fixing plate and a long plate vertically connected with the bottom of the lifting mechanism, a speed reducer is vertically and fixedly arranged on the long plate at the top of the first L-shaped fixing plate, a servo motor used for driving the speed reducer, a guide post penetrating through an output shaft of the speed reducer, a threaded hole arranged in the middle of the guide post, a screw rod connected in the guide post, a cylinder fixedly arranged on the inner side of a short plate at the top of the U-shaped fixing plate, a piston rod of the cylinder, a transverse plate used for fixing the screw rod of the speed reducer and the piston rod of the cylinder through a fixing element, a longitudinal plate used for connecting the end of the profile with the second L-shaped fixing plate through a fixing element, a third L-shaped fixing plate connected with the short plate of the first L-shaped fixing plate through a fixing element, a strip-shaped mounting groove formed in the longitudinal plate parallel to the long plate of the first L-shaped fixing plate, and a proximity switch fixedly connected with the control system through the fixing element.

5. The precise powder thickness control mechanism according to claim 4, wherein a guide hole is formed in the longitudinal plate of the U-shaped fixing plate, a positioning pin is vertically arranged at the lower end of the screw in a penetrating manner and used for positioning the screw and performing linear motion along the guide hole of the U-shaped fixing plate, and the upper end of the screw is bolted to the third L-shaped section fixing plate through a nut; the outer surface of the guide post is provided with a key slot for installing a key pin, and the guide post is embedded into the output shaft end of the speed reducer through the key pin; the screw bottom is provided with a zero position identification electric eye for identifying and locking the screw zero position, and the zero position identification electric eye is electrically connected with the control system.

6. The accurate powder thickness control mechanism according to claim 1, wherein the control system comprises a touch screen, a PLC (programmable logic controller), a laser thickness ranging sensor, a servo driver and a servo motor, and the PLC is used as a control core and is in signal transmission with the touch screen, the laser thickness ranging sensor and the servo driver through network cable connection; when the servo motor receives the driving signal of the servo driver, the speed reducer is driven, the guide post embedded at the output shaft end of the speed reducer moves along with the speed reducer, and the lower end of the screw rod moves vertically and linearly along with the guide post under the action of the positioning pin.

7. The control method of the powder thickness accurate control mechanism is characterized by comprising the following steps of:

the method comprises the steps of setting the thickness of powder, driving servo motors of a first lifting mechanism and a second lifting mechanism, driving a speed reducer, enabling a guide post embedded at the output shaft end of the speed reducer to move along with the speed reducer, enabling the lower end of a screw rod to move vertically along with the guide post under the action of a locating pin, and then driving the whole scraper mechanism to move vertically until the thickness of the set powder is reached;

the thickness of powder is read through the first laser ranging sensor and the second laser ranging sensor at the two ends of the thickness detection mechanism, and the thickness is fed back to the PLC controller to instruct the scraper mechanism to adjust in real time, so that stable and accurate control is realized.