CN115158801B - Starting method of paper shoveling frame - Google Patents

Abstract

The invention discloses a method for starting a paper shoveling frame, which divides the insertion starting control of the paper shoveling frame into three modes of starting without advance and delay, starting with advance and starting with delay, can be matched with different starting modes according to the actual production requirements, adapts to the different actual production requirements, can avoid the problem that the paper shoveling frame is hit or cannot catch a paper box due to the reasons of a mechanical structure and the like, and improves the insertion stability of the paper shoveling frame; the control signal of the method is detected in real time through the counting photoelectric switch and the measuring encoder of the paper feeding belt, is not influenced by the type of the paper box and the conveying speed, and is stable, effective and reliable in control.

Description

A method for starting a paper shoveling stand

This application is a divisional application with application number 202011387444.7, application date 2020.12.01, and invention name “A method for starting vertical insertion of a paper shovel rack”.

Technical Field

The invention relates to the technical field of stacking of carton production, and in particular to a method for starting a vertical insertion of a paper shoveling rack.

Background technique

The counting and pushing unit is an important unit of the carton gluer. It is a device that further stacks, corrects, counts, separates, and conveys the cartons formed by the folding unit. In order to achieve uninterrupted stacking, separation, and conveying of paper bundles, it is necessary to control the paper shovel rack to insert between the last carton of the old paper bundle and the first carton of the new paper bundle after the old paper bundle is stacked, separate the new paper bundle from the old paper bundle, and reach the upper surface of the old paper bundle, clamp the old paper bundle together with the paper support rack, and convey the old paper bundle out.

Traditionally, the stacking completion mark of paper bundles is obtained by detecting the falling edge of the last carton of the paper bundle through a counting photoelectric switch. Due to mechanical inertia, too small a distance between two cartons, too fast a paper feeding speed, too large an insertion stroke of the paper shoveling frame, limited torque and maximum speed of the paper shoveling frame, and control system lag, the insertion of the paper shoveling frame will be delayed and fail to achieve the set insertion effect.

In addition, due to the limitations of the mechanical structure, the installation position of the counting photoelectric switch is sometimes far away from the paper outlet. In addition, when the last carton of the old paper bundle leaves the paper outlet, if the conveying speed of the carton is too fast, the carton will float up due to inertia, delaying the descent of the carton. The paper pressing blower at the paper outlet has insufficient wind power, etc., which may cause the paper shoveling rack to hit the last carton of the old paper bundle due to being inserted too quickly.

It can be seen that the existing technology still needs to be improved and enhanced.

Summary of the invention

In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a method for starting a paper shoveling rack for vertical insertion, aiming to solve at least one of the above-mentioned technical problems in the prior art.

In order to achieve the above object, the present invention adopts the following technical solutions:

A method for starting a paper shoveling rack by vertical insertion comprises the following steps:

S100. Start the paper feed switch;

S200. Counting photoelectric switch detects carton counting;

S300. When the counting photoelectric switch reads the number of paper bundles stacked = target value -1, the controller reads the insertion start mode of the shovel paper rack;

S400. The counting photoelectric switch determines whether the number of paper bundles stacked reaches the target value. If the number of paper bundles stacked reaches the target value, a paper bundle stacking completion mark is generated and the insertion of the paper shoveling rack is started; if the number of paper bundles stacked does not reach the target value, the insertion start mode of the paper shoveling rack is re-read.

In the method for starting the paper shoveling frame by vertical insertion, in step S300, the insertion start modes of the paper shoveling frame include: advanced start, delayed start, and no advanced start or delayed start.

In the method for starting the paper shoveling rack to be vertically inserted, the step S300 includes:

When the insertion of the paper shovel holder does not affect the normal stacking of cartons, the controller reads the no advance and no delay start mode;

When the insertion of the paper shovel holder hits or fails to receive the first carton of the new paper bundle, the advance start mode is selected;

When the insertion of the paper shovel holder hits the last carton of the old paper bundle, the delayed start mode is selected.

In the method for starting the paper shoveling rack by vertical insertion, the advanced start mode includes the following steps:

A100. The paper feeding belt measuring encoder reads the carton conveyance in real time;

A200. The controller reads the measurement value of the paper feeding belt measuring encoder when the counting photoelectric switch just detects the last carton, and sets it as the starting position value _PSBox of the last carton;

A300. The paper feeding belt measuring encoder reads the current position value P _ABox of the last carton in real time, and calculates the conveying length L _TBox of the last carton in real time;

A400. When the transmission length L _TBox of the last carton is greater than or equal to the difference between the set carton length L _SBox and the set advance distance _DEAdj , the paper bundle stacking quantity obtained by the counting photoelectric switch reaches the target value.

In the method for starting the vertical insertion of the paper shoveling frame, the step A100 further includes:

A000. Presets the carton length _LSBox , the advance distance _DEAdj , the number of paper bundles to be stacked and the insertion start mode of the paper shoveling rack.

In the method for starting the vertical insertion of the paper shoveling rack, the conveying length L _TBox of the last carton in step A300 is:

_LTBox ＝( _PABox - _PSBox + _MBelt ) _MODMBelt

Where, L _TBox is the conveying length of the last carton, in millimeters;

P _ABox is the current position value of the last carton, in millimeters;

_PSBox is the starting position value of the last carton, in millimeters;

M _Belt is the modulus value of the paper conveyor belt encoder.

In the method for starting the paper shoveling rack by vertical insertion, the delayed start mode includes the following steps:

B100. The paper feeding belt measuring encoder reads the carton conveyance in real time;

B200. The controller reads the measurement value of the paper feeding belt measuring encoder when the counting photoelectric switch just detects the last carton, and sets it as the starting position value _PSBox of the last carton;

B300. The controller reads the measurement value of the paper feeding belt measuring encoder when the last carton just leaves the counting photoelectric switch, and sets it as the end position value P _EBox of the last carton;

B400. The controller calculates the length L _Box of the last carton. When the length L _Box of the last carton is greater than or equal to 0.8 times the set carton length L _SBox and less than or equal to 1.2 times the set carton length L _SBox , it is determined that the length of the last carton is within the effective length range;

B500. When the length L _Box of the last carton is within the valid length range, read the current position value P _ABox of the last carton in real time and calculate the actual delay distance D _Box of the last carton; when the length of the last carton is not within the valid range, return to step B200;

B600. When the actual delay distance D _Box is greater than or equal to the set delay distance D _DAdj , the number of paper bundles stacked reaches the target value; when the actual delay distance D _Box is less than the set delay distance D _DAdj , return to step B500.

In the method for starting the vertical insertion of the paper shoveling frame, the step B100 further includes:

B000. Preset the carton length _LSBox , set the delay distance _DDAdj , the number of paper bundles stacked and the insertion start mode of the paper shoveling rack.

In the method for starting the vertical insertion of the paper scooping frame, the length L _Box of the last carton in step B400 is:

L _Box = ( _PEBox - _PSBox + M _Belt ) MOD M _Belt ;

Where, L _Box is the length of the last carton in millimeters;

P _EBox is the end position value of the last carton, in millimeters;

_PSBox is the starting position value of the last carton, in millimeters;

M _Belt is the modulus value of the paper conveyor belt encoder.

In the method for starting the vertical insertion of the paper shoveling rack, the actual delay distance D _Box of the last carton in step B500 is:

D _Box = ( _{PABox -PEBox} +M _Belt ) MOD M _Belt ;

Where D _Box is the actual delay distance of the last carton, in millimeters;

P _ABox is the current position value of the last carton, in millimeters;

P _EBox is the end position value of the last carton, in millimeters;

M _Belt is the modulus value of the paper feed belt encoder.

Beneficial effects:

The present invention provides a method for starting the vertical insertion of a paper shoveling stand. The method divides the insertion start control of the paper shoveling stand into three modes: no advance and delayed start, advance start, and delayed start. The method is adapted to different needs of actual production, can avoid the problem that the paper shoveling stand hits or fails to receive a carton due to mechanical structure and other reasons, and improves the insertion stability of the paper shoveling stand. The control signal of the method is detected in real time by a counting photoelectric switch and a measuring encoder of a paper feeding belt, is not affected by the type of carton and the conveying speed, and has stable, effective and reliable control.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow chart of a method for starting the vertical insertion of the paper shoveling stand provided by the present invention.

FIG. 2 is a flow chart of the advance start of the paper shoveling rack.

FIG. 3 is a diagram showing the effect of the advance start of the paper shoveling rack.

FIG. 4 is a flow chart of the delayed start of the paper shoveling rack.

FIG. 5 is a diagram showing the effect of delayed start of the paper shoveling rack.

Detailed ways

The present invention provides a method for starting a paper shovel holder for vertical insertion. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

In the description of the present invention, the "old paper bundle" and "new paper bundle" refer to two paper bundles pushed out successively during the process, the former being called the "old paper bundle" and the latter being called the "new paper bundle". The "no advanced and delayed insertion" means that the paper shoveling rack is inserted vertically according to the general mode, and is not advanced or delayed relative to the general start time.

Referring to FIG. 1 , the present invention provides a method for starting a paper shoveling frame by vertical insertion, comprising the following steps:

S100. Start the paper feed switch;

S200. Counting photoelectric switch detects carton counting;

S300. When the counting photoelectric switch reads that the number of paper bundles stacked = target value - 1, the controller reads the insertion start mode of the paper shoveling rack; when the number of paper bundles stacked = target value - 1, the last carton of the paper bundle is to be transmitted. At this time, the controller can read different start modes according to the transmission situation of the carton to ensure stable and continuous push-out of the carton.

S400. The counting photoelectric switch determines whether the number of paper bundles stacked reaches the target value. If the number of paper bundles stacked reaches the target value, a paper bundle stacking completion mark is generated and the insertion of the paper shoveling rack is started; if the number of paper bundles stacked does not reach the target value, the insertion start mode of the paper shoveling rack is re-read.

The method sets different paper shoveling frame insertion start modes according to actual production needs, which can avoid the problem that the paper shoveling frame hits or fails to catch the carton due to mechanical structure and other reasons, and improves the stability of paper shoveling frame insertion; the control signal of the method is detected in real time by a counting photoelectric switch and a measuring encoder of a paper feeding belt, which is not affected by the type of carton and the conveying speed, and the control is stable, effective and reliable; the controller is a built-in controller of the carton gluer or an external controller, including but not limited to a PLC controller.

Specifically, in step S300, the insertion start mode of the paper shoveling holder includes three modes: advanced start, delayed start, and neither advanced start nor delayed start.

More specifically, when the insertion of the paper shoveling rack does not affect the normal stacking of cartons, the controller reads the no advance and no delay start mode;

When the paper shoveling rack hits or fails to connect the first carton of a new paper bundle, the insertion of the paper shoveling rack cannot achieve a stable insertion effect due to movement lag. To avoid this phenomenon, select the advanced start mode;

When the paper shoveling rack hits the last carton of the old paper bundle, the paper shoveling rack will be inserted too quickly without the advance and delay start mode. To avoid this phenomenon, select the delay start mode.

In one implementation, as shown in FIG2 , the advance start mode includes the following steps:

A100. The paper feeding belt measuring encoder reads the carton conveyance in real time;

A200. The controller reads the measurement value of the paper feeding belt measuring encoder when the counting photoelectric switch just detects the last carton, and sets it as the starting position value _PSBox of the last carton;

Specifically, since a rising edge is generated when the counting photoelectric switch just detects the last carton; therefore, when the number of paper bundles stacked = target value - 1, when the counting photoelectric switch just detects the carton, if a rising edge is generated, the carton is determined to be the last carton of the paper bundle, and the counting photoelectric switch continues to detect the carton, the measurement value of the paper feeding belt measurement encoder at this time is set as the starting position value P _SBox of the last carton; if no rising edge is generated, the counting photoelectric switch continues to scan the starting position of the last carton.

The method generates corresponding signals through real-time detection by counting photoelectric switches and paper feeding belt measuring encoders, is not affected by carton types and conveying speeds, and has stable and accurate control.

A300. The paper feeding belt measuring encoder reads the current position value P _ABox of the last carton in real time, and calculates the conveying length L _TBox of the last carton in real time;

A400. When the transmission length L _TBox of the last carton is greater than or equal to the difference between the set carton length L _SBox and the set advance distance _DEAdj , the paper bundle stacking quantity obtained by the counting photoelectric switch reaches the target value.

Furthermore, before step A100, the step further includes:

A000. Preset carton length _LSBox , advance distance _DEAdj , paper bundle stacking quantity and paper shoveling rack insertion start mode; the above parameters can be freely adjusted according to actual production needs to meet different production needs. Of course, in actual production, other parameters can also be set according to needs, such as production speed, paper thickness, etc.

Specifically, the conveying length L _TBox of the last carton in step A300 is:

_LTBox ＝( _PABox - _PSBox + _MBelt ) _MODMBelt

Where, L _TBox is the conveying length of the last carton, in millimeters;

P _ABox is the current position value of the last carton, in millimeters;

_PSBox is the starting position value of the last carton, in millimeters;

M _Belt is the modulus value of the paper feed belt encoder.

The effect of the advance start of the paper shoveling rack insertion is shown in FIG3 .

Set the position of the paper shoveling rack when starting to insert to position A, the position of the paper shoveling rack when it is located on the upper surface of the paper outlet to position B, the position of the paper shoveling rack when it is located on the lower surface of the paper outlet to position D, and the position of the paper shoveling rack when it is located on the upper surface of the old paper bundle to position F.

In one embodiment, the circumference of the printing press cylinder is set to 999.5 mm, the counting photoelectric switch is installed at a position 195 mm away from the paper outlet, and a carton with a length of 900 mm, a thickness of 20 mm, and a stacking number of 10 sheets is produced, and the production speed is 10200 sheets/hour; the paper shoveling frame is tested in two ways: no advance and delayed vertical insertion, and advanced start vertical insertion. The test results are shown in Table 1.

Table 1

It can be seen from Table 1 that when the paper shoveling frame is started in a non-advanced and non-delayed manner, when the first carton of the new paper bundle is delivered to a position perpendicular to the tip of the paper shoveling frame, the paper shoveling frame has not yet descended to the position of the lower surface of the paper outlet, causing the paper shoveling frame to hit the first carton of the new paper bundle, affecting the continuous production; while when the advance insertion starting mode is adopted, the paper shoveling frame will not affect the paper discharge and stacking of the new paper bundle during the descent process, and the advance insertion point of the paper shoveling frame can be freely adjusted and controlled according to production requirements, thereby effectively overcoming the lag problem of the paper shoveling frame insertion and adapting to the application of different mechanical mechanisms.

Referring to FIG. 4 , in another embodiment, the delayed start mode of inserting the paper shovel holder includes the following steps:

B100. The paper feeding belt measuring encoder reads the carton conveyance in real time;

B200. The controller reads the measurement value of the paper feeding belt measuring encoder when the counting photoelectric switch just detects the last carton, and sets it as the starting position value _PSBox of the last carton;

Specifically, since a rising edge is generated when the counting photoelectric switch just detects the last carton, when the stacking quantity of the paper bundle = the target value - 1, if a rising edge is generated when the counting photoelectric switch just detects the carton, it is determined that the carton is the last carton of the paper bundle, and the measurement value of the paper feeding belt measurement encoder at this time is set as the starting position value P _SBox of the last carton; if no rising edge is generated, the counting photoelectric switch continues to scan the starting position of the last carton.

B300. The controller reads the measurement value of the paper feeding belt measuring encoder when the last carton just leaves the counting photoelectric switch, and sets it as the end position value P _EBox of the last carton;

Specifically, since a falling edge is generated when the last carton just leaves the counting photoelectric switch, when the counting photoelectric switch just detects that the last carton has left, if a falling edge is generated, it is determined that the detection of the last carton in the paper bundle is completed, and the measurement value of the paper feeding belt measurement encoder at this time is set as the end position value of the last carton; if no falling edge is generated, the counting photoelectric switch continues to scan the end position of the last carton.

B400. The controller calculates the length L _Box of the last carton. When the length L _Box of the last carton is greater than or equal to 0.8 times the set carton length L _SBox and less than or equal to 1.2 times the set carton length L _SBox , it is determined that the length of the last carton is within the effective length range;

B500. When the length L _Box of the last carton is within the valid length range, read the current position value P _ABox of the last carton in real time, and calculate the actual delay distance D _Box of the last carton; when the length of the last carton is not within the valid range, return to step B200, re-read the starting position of the last carton, and enter a new loop until the length of the last carton obtained in real time is within the preset valid range;

B600. When the actual delay distance D _Box is greater than or equal to the set delay distance D _DAdj , the detection of the last carton is completed, the number of paper bundles stacked reaches the target value, and the detection of one bundle of cartons is completed; when the actual delay distance D _Box is less than the set delay distance D _DAdj , return to step B500 and re-obtain the delay distance of the last carton.

Specifically, before step B100, the following steps may also be included:

B000. Preset the carton length _LSBox , set the delay distance _DDAdj , the number of paper bundles and the insertion start mode of the paper shoveling rack; of course, other parameters such as production speed, paper thickness, etc. can also be set according to actual production needs.

Furthermore, through the end position and start position of the last carton, and the modulus value of the paper feeding belt measuring encoder, the length L _Box of the last carton can be obtained according to the following formula:

L _Box = ( _PEBox - _PSBox + M _Belt ) MOD M _Belt ;

Where, L _Box is the length of the last carton in millimeters;

P _EBox is the end position value of the last carton, in millimeters;

_PSBox is the starting position value of the last carton, in millimeters;

M _Belt is the modulus value of the paper conveyor belt encoder.

Furthermore, the actual delay distance D _Box of the last carton can be obtained by the current position value, the end position value and the modulus value of the encoder measured by the paper feeding belt according to the following formula:

D _Box = ( _{PABox -PEBox} +M _Belt ) MOD M _Belt ;

Where D _Box is the actual delay distance of the last carton, in millimeters;

P _ABox is the current position value of the last carton, in millimeters;

P _EBox is the end position value of the last carton, in millimeters;

M _Belt is the modulus value of the paper feed belt encoder.

Through the above-mentioned delayed start insertion method, the delayed insertion point of the paper shoveling frame can be freely adjusted and controlled according to actual production needs, thereby effectively overcoming the problem of the paper shoveling frame being inserted ahead of time, adapting to the application of different mechanical mechanisms, and controlling stably, effectively and reliably. The effect diagram of the method is shown in FIG5 .

In one embodiment, the circumference of the printing press cylinder is set to 999.5 mm, the counting photoelectric switch is installed at a position 340 mm away from the paper outlet, and a carton with a length of 900 mm, a thickness of 20 mm, and a stacked bundle of 10 sheets is produced. The production speed is 10200 sheets/hour; the paper shoveling frame is tested in two ways: no advanced and delayed vertical insertion, and delayed vertical insertion of the paper shoveling frame. The test results are shown in Table 2.

Table 2:

From the data in Table 2, it can be seen that when the paper shoveling rack is inserted in the non-advanced and non-delayed start-up mode, when the last carton of the old paper bundle is just conveyed out of the paper outlet, the paper shoveling rack has dropped to a position below the upper surface of the paper outlet, and will hit the last carton of the old paper bundle, affecting the stable production. However, when the delayed insertion start-up mode is adopted, the paper shoveling rack will not affect the stacking of the old or new paper bundles during the insertion process, which can effectively overcome the problem of the paper shoveling rack being inserted too quickly and improve the stability of production.

In summary, the present invention divides the start control of paper shoveling holder insertion into three modes: no advance and delayed start, advance start, and delayed start. This allows users to start three different modes respectively according to actual production needs to adapt to different production needs; and the counting photoelectric switch and the paper feeding belt measuring encoder generate control signals in real time to ensure accurate and stable control.

It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the claims attached to the present invention.

Claims (7)

1. A method for starting a paper shoveling stand, characterized in that it comprises the following steps: S100. Start the paper feed switch; S200. Counting photoelectric switch detects carton counting; S300. When the counting photoelectric switch reads that the number of paper bundles stacked = target value - 1, the controller reads the insertion start mode of the shoveling rack; the insertion start mode of the shoveling rack includes an advance start mode and a delayed start mode; when the insertion of the shoveling rack hits or fails to connect the first carton of the new paper bundle, the advance start mode is selected; when the insertion of the shoveling rack hits the last carton of the old paper bundle, the delayed start mode is selected; S400. The counting photoelectric switch determines whether the number of paper bundles stacked reaches the target value. If the number of paper bundles stacked reaches the target value, a paper bundle stacking completion flag is generated, and the insertion of the shovel paper rack is started; if the number of paper bundles stacked does not reach the target value, the insertion start mode of the shovel paper rack is re-read; The advanced start mode comprises the following steps: A100. The paper feeding belt measuring encoder reads the carton conveyance in real time; A200. The controller reads the measurement value of the paper feeding belt measuring encoder when the counting photoelectric switch just detects the last carton, and sets it as the starting position value _PSBox of the last carton; A300. The paper feeding belt measuring encoder reads the current position value P _ABox of the last carton in real time, and calculates the conveying length L _TBox of the last carton in real time; A400. When the transmission length L _TBox of the last carton is greater than or equal to the difference between the set carton length L _SBox and the set advance distance _DEAdj , the number of paper bundles stacked obtained by the counting photoelectric switch reaches the target value; The delayed start mode includes the following steps: B100. The paper feeding belt measuring encoder reads the conveying of cartons in real time; B200. The controller reads the measurement value of the paper feeding belt measuring encoder when the counting photoelectric switch just detects the last carton, and sets it as the starting position value _PSBox of the last carton; B300. The controller reads the measurement value of the paper feeding belt measuring encoder when the last carton just leaves the counting photoelectric switch, and sets it as the end position value P _EBox of the last carton; B400. The controller calculates the length L _Box of the last carton. When the length L _Box of the last carton is greater than or equal to 0.8 times the set carton length L _SBox and less than or equal to 1.2 times the set carton length L _SBox , it is determined that the length of the last carton is within the effective length range; B500. When the length L _Box of the last carton is within the valid length range, read the current position value P _ABox of the last carton in real time and calculate the actual delay distance D _Box of the last carton; when the length of the last carton is not within the valid range, return to step B200; B600. When the actual delay distance D _Box is greater than or equal to the set delay distance D _DAdj , the number of paper bundles stacked reaches the target value; when the actual delay distance D _Box is less than the set delay distance D _DAdj , return to step B500; The actual delay distance D _Box of the last carton in step B500 is: D _Box = ( _{PABox -PEBox} +M _Belt ) MOD M _Belt ; Where D _Box is the actual delay distance of the last carton, in millimeters; P _ABox is the current position value of the last carton, in millimeters; P _EBox is the end position value of the last carton, in millimeters; M _Belt is the modulus value of the paper feed belt encoder. 2. The method for starting a paper shoveling stand according to claim 1, characterized in that, in the step S300, the insertion start mode of the paper shoveling stand further includes a non-advance start mode and a delayed start mode. 3. The method for starting the paper shoveling stand according to claim 2, wherein step S300 comprises: When the insertion of the paper shovel holder does not affect the normal stacking of cartons, the controller reads the no advance and no delay start mode. 4. The method for starting a paper shoveling stand according to claim 1, characterized in that before step A100, it further comprises: A000. Presets the carton length _LSBox , the advance distance _DEAdj , the number of paper bundles to be stacked and the insertion start mode of the paper shoveling rack. 5. The method for starting a paper shoveling stand according to claim 1, wherein the conveying length L _TBox of the last carton in step A300 is: Where, L _TBox is the conveying length of the last carton, in millimeters; P _ABox is the current position value of the last carton, in millimeters; _PSBox is the starting position value of the last carton, in millimeters; M _Belt is the modulus value of the paper conveyor belt encoder. 6. The method for starting a paper shoveling stand according to claim 1, characterized in that before step B100, it further comprises: B000. Preset the carton length _LSBox , set the delay distance _DDAdj , the number of paper bundles stacked and the insertion start mode of the paper shoveling rack. 7. The method for starting a paper shoveling stand according to claim 1, wherein the length L _Box of the last paper box in step B400 is: L _Box = ( _PEBox - _PSBox + _MBelt ) _MODMBelt ; Where, L _Box is the length of the last carton in millimeters; P _EBox is the end position value of the last carton, in millimeters; _PSBox is the starting position value of the last carton, in millimeters; M _Belt is the modulus value of the paper conveyor belt encoder.