CN106184956B - A high-precision linear labeling machine - Google Patents

Abstract

The invention discloses a kind of high-precision straight line labelling machines, including labelling head, conveying device, inspection mark electric eye, examine object electric eye, the driving power for labelling head uses stepper motor, the driving power of conveying device uses servo motor, it further include PLC master controller, PLC master controller starts servo motor, conveying device is driven by servo motor by labeling object of which movement, when inspection object electric eye, which is detected, to be passed through by labeling object, PLC master controller enters external interrupt subprogram, trigger high-speed counter, high-speed counter reads the umber of pulse of the pulse delivery outlet output of servo motor, after high-speed counter counting reaches target value, PLC master controller starting stepper motor continuously moves, after inspection mark electric eye detects the gap between label, control stepper motor stops after moving to distance to a declared goal, to realize the function of labeling；Invention increases labeling precision, realize stepless time adjustment, can be switched fast speed to cooperate the speed of production of whole production line, keep production line efficient, smooth.

Description

A high-precision linear labeling machine

technical field

The invention relates to the technical field of product packaging, in particular to a high-precision linear labeling machine.

Background technique

For production enterprises that need product packaging, labeling machines are indispensable machines. The labeling machine is a device that sticks rolls of self-adhesive paper labels (paper or metal foil) on PCBs, products or prescribed packaging. Labeling machines are an integral part of modern packaging.

The labeling machine is divided into a linear labeling machine and a rotary labeling machine. At present, most of the domestic labeling machines are linear labeling machines. The linear labeling machine is mainly composed of a labeling head and a conveying device. The linear labeling machine The driving power of the labeling head is a servo motor, the driving power of the conveying device is an AC motor, and the labeling error of the linear labeling machine at the same speed is ±1mm. The labeling position at different speeds is inconsistent, and the error of the labeling position at the low speed of 3m/min and the high speed of 30m/min reaches about 5mm.

The labeling error of the linear labeling machine at the same speed is ±1mm, and the labeling position is inconsistent at different speeds. The labeling position error at the low speed of 3m/min and the high speed of 30m/min is about 5mm. The overall labeling The standard accuracy is not high. This shows that there are certain deficiencies in the prior art.

Contents of the invention

In view of this, in order to solve the technical problem of low labeling accuracy of linear labeling machines in the prior art, the present invention proposes a high-precision linear labeling machine.

The present invention solves the above problems by the following technical means:

A high-precision linear labeling machine, including a labeling head, a conveying device, a label inspection electric eye, and an object inspection electric eye. The driving power of the labeling head is a stepping motor, and the driving power of the conveying device is a servo motor;

It also includes a PLC main controller, the two high-speed pulse output ports of the PLC main controller are respectively connected to the stepping motor and the servo motor, and the object detection electric eye and the label detection electric eye are respectively connected to the interrupt signal input port of the PLC main controller. The high-speed counting pulse port of the PLC master controller is connected to the high-speed pulse output port of the servo motor;

The labeling head is used to drive the bottom paper of the label to move through the stepping motor;

The conveying device is used to drive the labeled object to move through the servo motor;

The electric eye for detecting marks is used to detect the gap between labels;

The object detection electric eye is used to detect the passing of the labeled object;

The PLC main controller starts the servo motor, and the conveying device drives the labeled object to move through the servo motor. When the object detection sensor detects that the labeled object passes by, the PLC main controller enters the external interrupt subroutine, triggers the high-speed counter, and the high-speed counter reads Take the number of pulses output by the pulse output port of the servo motor. After the high-speed counter counts to the target value, the PLC main controller starts the stepper motor to move continuously until the electric eye detects the gap between the labels, and then controls the stepper motor to move to the specified position. Stop after the distance, thus realizing the function of labeling.

Further, the stepper motor is an 86-type stepper motor.

Further, the servo motor is a 750W servo motor.

Further, the belt conveyor belt of the conveying device adopts a chain plate conveyor belt.

Further, the PLC main controller adopts Siemens PLC S7-200 SMART.

Furthermore, the high-precision linear labeling machine adjusts and compensates the labeling position by adjusting the target value counted by the high-speed counter, so that when the conveying device switches speeds, the labeling position remains consistent and achieves stepless speed regulation.

Further, the specific method of adjusting and compensating the labeling position of the high-precision linear labeling machine is as follows:

Determine a speed as the reference speed, assuming the reference speed is v ₀ ,

s=t×(vv ₀ )

s is the labeling position error when changing the speed, t is the acceleration time, v is the speed of the conveying device,

The formula for calculating the number of pulses for labeling position adjustment compensation is:

p=s÷d÷π×n

p is the number of pulses for labeling position adjustment compensation, d is the diameter of the pulley, and n is the electronic gear ratio of the servo motor.

Further, the reference speed is set to 3m/min.

Compared with the prior art, the beneficial effects of the present invention are as follows:

The linear labeling machine of the present invention increases the labeling accuracy. In the prior art, the driving power of the labeling head of the linear labeling machine uses a 750W servo motor. When the speed is high, there will be a momentary stall situation during the acceleration process. In the process of commanding the drive power motor to move to the specified distance and then stop, because the servo motor has a self-feedback correction function, there will be no out-of-step situation. The stop distance of the motor will be larger than the actual distance, that is, the stop distance of the high speed is larger than the stop distance of the small speed, and when the speed of the label is changed, the position of the stop label is inconsistent. The linear labeling machine of the present invention The driving power of the labeling head adopts a stepping motor without self-feedback correction function, so this problem does not exist; compared with the AC motor as the driving power of the conveying device, the conveying device of the present invention uses a 750W servo motor as the driving power, and the belt in the conveying device The conveyor belt adopts the chain-plate conveyor belt, which has the advantages of stable speed, and in the case of changing the speed of the conveyor belt, it is not necessary to use the encoder to feed back the real-time speed, which reduces the mechanical error caused when the encoder is installed, thereby increasing the stickiness. standard accuracy.

The linear labeling machine of the present invention realizes the function of stepless speed regulation. The labeling position error of the linear labeling machine at different speeds is ±0.5mm. In the actual production process, the labeling machine can first work at a low speed. Carry out machine debugging. After the machine debugging is completed, increase the speed of the labeling machine to reach the actual working speed, which reduces the difficulty of debugging, saves materials, and improves work efficiency. Since the linear labeling machine realizes the function of stepless speed regulation, it can quickly switch the speed to Cooperating with the production speed of the whole production line, it makes the production line efficient and smooth.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is the control schematic diagram of the high-precision linear labeling machine of the present invention;

Fig. 2 is the labeling flowchart of the high-precision linear labeling machine of the present invention;

Fig. 3 is a structural schematic diagram of the high-precision linear labeling machine of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be pointed out that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all those skilled in the art can obtain without creative work. Other embodiments all belong to the protection scope of the present invention.

Example

As shown in Figure 1-3, a high-precision linear labeling machine includes a labeling head, a conveying device, a label inspection electric eye, and an object inspection electric eye. The driving power of the labeling head adopts a stepping motor, and the conveying device The drive power adopts servo motor;

It also includes a PLC main controller, the two high-speed pulse output ports of the PLC main controller are respectively connected to the stepping motor and the servo motor, and the object detection electric eye and the label detection electric eye are respectively connected to the interrupt signal input port of the PLC main controller. The high-speed counting pulse port of the PLC master controller is connected to the high-speed pulse output port of the servo motor;

The labeling head is used to drive the bottom paper of the label to move through the stepping motor;

The conveying device is used to drive the labeled object to move through the servo motor;

The electric eye for detecting marks is used to detect the gap between labels;

The object detection electric eye is used to detect the passing of the labeled object;

The PLC main controller starts the servo motor, and the conveying device drives the labeled object to move through the servo motor. When the object detection sensor detects that the labeled object passes by, the PLC main controller enters the external interrupt subroutine, triggers the high-speed counter, and the high-speed counter reads Take the number of pulses output by the pulse output port of the servo motor. After the high-speed counter counts to the target value, the PLC main controller starts the stepper motor to move continuously until the electric eye detects the gap between the labels, and then controls the stepper motor to move to the specified position. Stop after the distance, thus realizing the function of labeling.

In the present embodiment, the stepper motor is an 86-type stepper motor, the servo motor is a 750W servo motor, the belt conveyor belt of the conveying device adopts a chain plate conveyor belt, and the PLC main controller adopts Siemens PLC S7-200SMART.

The linear labeling machine of the present invention is mainly composed of a labeling head, a conveying device, a label detecting electric eye and an object detecting electric eye. The driving power of the labeling head of the linear labeling machine is a 86-type stepping motor, and the driving power of the conveying device is 750W. The labeling of the servo motor and the linear labeling machine is divided into two processes, the stop process of the labeling head and the labeling process.

The labeling head drives the bottom paper of the label to move through the stepping motor until the label inspection electric eye detects the gap between the labels, and then commands the stepping motor to move to a specified distance and stop, thus realizing the function of stopping the label.

If the driving power of the labeling head of the linear labeling machine uses a 750W servo motor, when the servo motor accelerates from a static state to a higher speed with a load, there will be a momentary stall during the acceleration process. In the process of commanding the driving power motor to move to the specified distance and stop, because the servo motor has a self-feedback correction function, there will be no out-of-step situation, resulting in the stopping distance of the motor will increase than the actual distance, that is, the speed is high The label stop distance is larger than the one with a lower speed, so that when the label output speed changes, the position of the label stop is inconsistent. The driving power of the labeling head of the linear labeling machine of the present invention adopts a stepping motor, and there is no self-feedback correction function. This problem does not exist, so the 86-type stepper motor was selected.

Compared with the AC motor as the driving power of the conveying device, the conveying device of the present invention selects a 750W servo motor as the driving power, and the belt conveyer belt in the conveying device adopts the advantages of a chain-plate conveyer belt, which has the advantages of stable speed, and when changing the speed of the conveyer belt Next, it is not necessary to use the encoder to feed back the real-time speed, which reduces the mechanical error caused when the encoder is installed, thereby increasing the labeling accuracy.

The linear labeling machine of the present invention selects Siemens PLC S7-200 SMART as the main controller, and the two high-speed pulse output ports of the PLC main controller are respectively connected to the stepper motor and the servo motor, and the object detection electric eye and the label detection electric eye are respectively connected to the The interrupt signal input port of the PLC main controller, the high-speed counting pulse port of the PLC main controller is connected to the high-speed pulse output port of the servo motor, and is used for tracking the pulse position (adjusting the labeling position).

In the actual production process, because the labeling position of the labeling machine is inconsistent at different speeds, the machine is debugged at a higher actual working speed when debugging the machine, which increases the difficulty of debugging and wastes materials.

The high-precision linear labeling machine of the present invention adjusts and compensates the labeling position by adjusting the counting target value of the high-speed counter, so that when the speed of the conveying device is switched, the labeling position remains consistent and achieves stepless speed regulation.

The object to be labeled moves at a uniform speed on the conveyor belt, and the label will be attached to the object when the label accelerates from rest to the same speed as the conveyor belt. It takes a certain acceleration time to reach the target speed, so the labeling position at different speeds is inconsistent. In order to achieve the same labeling position when switching speeds and realize the stepless speed regulation function, we need to compensate the labeling position. Adjustment and compensation for labeling position can be realized by adjusting the target value of high-speed counter counting.

The specific method of adjusting and compensating the labeling position of the high-precision linear labeling machine is as follows:

Determine a speed as the reference speed, assuming the reference speed is v ₀ ,

s=t×(vv ₀ )

s is the labeling position error when changing the speed, t is the acceleration time, v is the speed of the conveying device,

The formula for calculating the number of pulses for labeling position adjustment compensation is:

p=s÷d÷π×n

p is the number of pulses for labeling position adjustment compensation, d is the diameter of the pulley, n is the electronic gear ratio of the servo motor,

The reference speed can be set to 3m/min.

When changing the speed, the linear labeling machine compensates the labeling position after the recognition operation. When actually debugging the machine, it is necessary to compare the actual effect and fine-tune the compensation of the linear labeling machine to achieve the best labeling accuracy. .

The linear labeling machine of the present invention realizes the function of stepless speed regulation. The labeling position error of the linear labeling machine at different speeds is ±0.5mm. In the actual production process, the labeling machine can first work at a low speed. Carry out machine debugging. After the machine debugging is completed, increase the speed of the labeling machine to reach the actual working speed, which reduces the difficulty of debugging, saves materials, and improves work efficiency. Since the linear labeling machine realizes the function of stepless speed regulation, it can quickly switch the speed to Cooperating with the production speed of the whole production line, it makes the production line efficient and smooth.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (5)

1. a kind of high-precision straight line labelling machine, which is characterized in that including labeling head, conveying device, inspection mark electric eye, object electric eye is examined, The driving power of the labeling head uses stepper motor, and the driving power of the conveying device uses servo motor；

It further include PLC master controller, two high-speed pulse output mouths of the PLC master controller are separately connected stepper motor and watch Motor is taken, inspection object electric eye and inspection mark electric eye are separately connected the interrupt signal input port of the PLC master controller, the PLC master control The high-speed counting pulse mouth of device processed connects servo motor high-speed pulse output mouth；

The labeling head is used to drive the base stock of label to move by stepper motor；

The conveying device is used to drive by servo motor by labeling object of which movement；

The inspection mark electric eye is used to detect the gap between label；

The inspection object electric eye is passed through for detecting by labeling object；

PLC master controller starts servo motor, and conveying device is driven by servo motor by labeling object of which movement, when inspection object electric eye It detects that PLC master controller enters external interrupt subprogram when being passed through by labeling object, triggers high-speed counter, high-speed counting Device reads the umber of pulse of the pulse delivery outlet output of servo motor, after high-speed counter counting reaches target value, PLC master controller Starting stepper motor continuously moves, and after inspection mark electric eye detects the gap between label, control stepper motor moves to specified Stop after distance, to realize the function of labeling；

Benefit is adjusted to labeling position in the target value that the high-precision straight line labelling machine is counted by adjusting high-speed counter It repays, when realizing conveying device switch speed, labeling position is consistent, and reaches stepless time adjustment；

The high-precision straight line labelling machine is adjusted compensation the specific method is as follows to labeling position:

Determine that a speed is benchmark speed, it is assumed that reference speed v₀,

S=t × (v-v₀)

S labels location error when being conversion rate, t is the acceleration time, and v is the speed of conveying device,

Label the umber of pulse calculation formula that position adjusts compensation are as follows:

P=s ÷ d ÷ π × n

P is the umber of pulse for labelling position and adjusting compensation, and d is diameter pulley, and n is servo motor electronic gear proportion.

2. high-precision straight line labelling machine according to claim 1, which is characterized in that the stepper motor is 86 formula stepping electricity Machine.

3. high-precision straight line labelling machine according to claim 1, which is characterized in that the servo motor is the servo of 750W Motor.

4. high-precision straight line labelling machine according to claim 1, which is characterized in that the PLC master controller uses west gate Sub- PLC S7-200 SMART.

5. high-precision straight line labelling machine according to claim 1, which is characterized in that the reference speed is set as 3m/ min。