CN112794140A

CN112794140A - Paper-withdrawing roll variable-speed-ratio rewinder and control system thereof

Info

Publication number: CN112794140A
Application number: CN202110201429.7A
Authority: CN
Inventors: 孟彦京; 刘玉; 马汇海
Original assignee: Shaanxi University of Science and Technology
Current assignee: Shaanxi University of Science and Technology
Priority date: 2021-02-23
Filing date: 2021-02-23
Publication date: 2021-05-14

Abstract

The invention discloses a paper-ejecting roller variable-speed-ratio rewinder and a control system thereof, aiming at solving the problem that the reduction ratio of a reduction box between the existing motor and the paper-ejecting roller is fixed, so that the existing motor must select a special large-range excitation adjustable direct current motor, and the cost of the motor is multiplied. The technical scheme of the invention is as follows: the variable-speed-ratio reduction gearbox is connected with the paper ejecting roller and the driving motor respectively through connecting flanges, and comprises a gear shifting mechanism. The gear shifting mechanism can switch the gear ratio of the variable-ratio reduction box. The invention can reduce the power of the paper-ejecting roller motor by more than half, reduce the running cost or power consumption loss of equipment and achieve the aim of energy conservation.

Description

Paper-withdrawing roll variable-speed-ratio rewinder and control system thereof

Technical Field

The invention belongs to the field of printing industrial machinery, and particularly relates to a paper-withdrawing roll variable-speed-ratio rewinding machine and a control system thereof.

Background

At present, the connection mode of a paper-ejecting roller motor and a paper-ejecting roller of a rewinding machine at home and abroad adopts a structure of a motor reinforced constant speed ratio reduction box. The reduction ratio of the reduction box between the motor and the paper-ejecting roller is fixed once the structure is determined, the actual working state of the rewinding machine is the starting moment of rewinding, the paper-ejecting roll has the maximum diameter, and the paper-ejecting roll has the minimum diameter when the rewinding is about to end. The difference between the minimum and maximum exit roll diameters is large, typically in the range of 1: 5 or more. The rewinding machine is a constant-power speed change and diameter change process under the condition of a certain working speed in the whole working process, and a special large-range excitation adjustable direct current motor is individually designed and selected in the past to realize large-range constant-power speed regulation. However, such a design has the disadvantages of increasing the cost of the motor by times and also causing inconvenience in maintenance and use due to the exclusive use of the motor, so that such a design is rarely available at present.

At present, the common method is that according to the existing conventional weak magnetic speed regulating motor, a fixed reduction ratio reduction box is matched according to the weak magnetic speed regulating range, and the requirements of working speed and torque are met by sacrificing a certain power. The biggest problem of the design of the scheme is that the power of the motor must be increased on the basis of the tension power. Usually, more than one time of the normal value needs to be increased or decreased, otherwise, the simultaneous requirements of the vehicle speed and the torque are difficult to meet. The design results not only increase the useless cost of the equipment, but also bring loss to the operation to cause the problem of efficiency reduction, and are not in line with the great trend of energy conservation and consumption reduction.

Disclosure of Invention

The invention aims to provide a paper-ejecting roller variable-speed-ratio rewinder and a control system thereof. The invention aims to solve the problem that the existing rewinding machine or similar winding type working machine is difficult to simultaneously solve the contradiction between the requirement on tension and the working speed.

In order to achieve the purpose, the specific technical scheme of the invention is as follows:

the utility model provides a variable velocity ratio rewinding machine of paper-ejecting roller, includes paper-ejecting roller 1, driving motor 6, is provided with variable velocity ratio reducing gear box 3 between paper-ejecting roller 1 and driving motor 6, variable velocity ratio reducing gear box 3 passes through flange and is connected with paper-ejecting roller 1 and driving motor 6 respectively, variable velocity ratio reducing gear box 3 includes gearshift 4.

The gear shifting mechanism is a conversion handle and an automatic conversion mechanism, the conversion handle is arranged above or on one side of the variable-speed-ratio reduction gearbox 3 and is connected with the automatic conversion mechanism, and the automatic conversion mechanism is controlled through an electric signal.

The gear shifting mechanism comprises a first reduction gearbox, a second reduction gearbox and a sliding connector, wherein the upper shaft and the lower shaft of the first reduction gearbox and the second reduction gearbox are communicated through the sliding connector which is connected together respectively, and the upper shaft and the lower shaft cannot be communicated simultaneously.

The control system of the paper withdrawing roll variable-speed-ratio rewinding machine comprises a PLC control system and a position detection sensor, when the position detection sensor detects that the diameter value of the paper withdrawing roll reaches a gear conversion diameter area, the position detection sensor of the gear shifting mechanism judges whether the rotating speed is maximum or not, if so, the working speed is automatically reduced, and if not, the control system continues to operate until the gear is automatically converted to the low-speed-reduction-ratio position after the machine is stopped.

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

the invention can reduce the motor power of the paper-ejecting roller by more than half on the basis of the existing design, and the cost increased by the added variable speed ratio reduction box is far lower than the cost saved by reducing the power of the whole control system due to the reduction of the motor power, and meanwhile, the scheme can reduce the running cost or the power consumption loss of equipment to achieve the aim of saving energy. Therefore, the design structure and the scheme can be adopted to carry out energy-saving and low-cost design for occasions using a rewinder system or similar constant-power winding devices. If the design scheme of the invention is widely adopted, a large amount of resources and electric energy consumption can be saved for enterprises and society, and the invention has great social significance and economic value.

Drawings

Fig. 1 is a schematic diagram of the structural principle of the present invention.

Fig. 2 is a schematic structural diagram of another embodiment of the present invention.

FIG. 3 is a schematic diagram of a control system according to the present invention.

In the figure, 1-paper withdrawing roller, 2-connecting flange, 3-variable speed ratio reduction box, 4-gear shifting mechanism, 6-driving motor, 7-sliding connector and 10-rotating handle.

Detailed Description

The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention include, but are not limited to, the scope shown in the following examples.

In order to illustrate the difference and change of the invention and the traditional fixed speed ratio rewinding machine in the power configuration and working process, it is assumed that the main parameters of a rewinding machine are as follows: maximum diameter D of paper-ejecting roller_MAX=2.8 m, minimum diameter D_MIN=0.5 m, the working linear speed is 1500 m/min, the rewinding working tension is 1 kg/cm, and the width of the paper web of the rewinding machine is 4.4 m.

According to the parameters, the tension power of the rewinding machine is P = FV =1500 × 440 × 9.8/60=108kw, namely, a 110kw motor is configured to meet the tension requirement, and the diameter change ratio is 2.8/0.5= 5.6. The prior general flux-weakening speed-regulating direct-current motor can select a motor with 110kw and 500/1500 rotating speed. However, if the electric machine is selected accordingly, a problem arises in that the torque demand and the rotational speed demand cannot be satisfied simultaneously. For example, the reduction ratio of the reduction gearbox is selected to be 1.5, and the minimum diameter rotating speed of the motor is n =1.5 × 1500/(3.14 × 0.5) =1433rpm according to 1500 m/branching speed, so that the requirement can be met. However, the maximum diametric torque requirement cannot be met, for example, when the maximum diameter is 2.8 meters, the torque requirement is M =440 × 1.4=616kgm, which translates into a motor shaft torque of Mn =616/1.5=410.7kgm, and a motor rated torque Me =110000/500=220kgm, and it is clear that a 1.5-ratio reduction gearbox is selected to meet the operating speed but not the torque requirement. The current method is to increase the power of the motor, when a 200kw motor is selected, the rated torque is calculated to be 400kgm, the requirement is basically met, and the normal motor model selection design is the condition that the rated torque is slightly insufficient (the difference is 10.7 kgm).

Referring to fig. 1, the structural principle of the present invention is schematically shown. And adopting variable reduction ratio design according to the data. Selecting a reduction ratio 1 and a reduction ratio 3 to design: firstly, the torque requirement is that when the reduction ratio is 3, the torque requirement Mn =616/3=205.3kgm of the motor shaft, and the rated torque of the 110kw motor is 220, which completely meets the requirement; and (3) rotating speed accounting: when the diameter of the paper unwinding roll is reduced to 1 meter, the rotating speed reaches the highest 1433, the gear is switched to a 1-speed reduction ratio, the torque requirement is just met when M =440 × 0.5=220kgm, and obviously, the rotating speed requirement is also met. Therefore, the purpose of reducing power configuration and simultaneously meeting the requirements of rotating speed and torque can be realized through the simple structural design of stopping and shifting. The contradiction between the requirement of meeting the torque and the requirement of meeting the speed at the same time can be solved through diameter detection and interlocking control of the gear shifting mechanism. In fact, the torque and the working vehicle speed are not strict, so long as the index requirements under the most extreme condition are ensured, for example, the torque requirement of the maximum diameter can meet the requirement that other diameters necessarily meet; similarly, as long as the rotating speed of the minimum diameter meets the requirement, the rotating speed of other diameters can meet the requirement necessarily. The diameter point thus switched is also adjustable up and down floatingly, so that no additional control and operational complexity is involved.

Referring to fig. 2, a schematic structural diagram of another embodiment of the present invention is a structural design scheme of a double reduction gearbox configuration, which adopts the existing product to reduce the customization process and also to achieve the purpose of shifting, and the working principle is as follows:

the arrows 9 and left and right in fig. 2 indicate that the components are slidable to the left or right simultaneously to connect the

sliding connectors

7, 8 together. The position of figure 2 is the position of the connector assembly at the left end, the function is to connect the upper shafts of the reduction boxes 3 and 4 together, the lower shaft is disconnected, the motor 6 is connected with the reduction box 3 through the reduction box 4, the lower shafts of the reduction boxes 3 and 4 rotate independently, the reduction ratio is 1, and the motor and the reduction boxes are connected in a straight-through manner. When the sliding connector moves to the right, the upper end shafts of the reduction gearbox 3 and the reduction gearbox 4 are disconnected, the lower end shafts are communicated by 8, the upper end shafts of the reduction gearbox rotate independently, the lower end shaft of the reduction gearbox 4 is connected with the input shaft of the reduction gearbox 3, the reduction gearbox 3 is in a working state with a reduction ratio of 3, the design, the arrangement and the structure can be adjusted, for example, the speed ratio of the reduction gearbox 3 is 1, the speed ratio of the reduction gearbox 4 is 3, the connection diagram can be changed to a certain extent, but the basic working mode and the working characteristics are unchanged, and the reduction ratio can be changed. Therefore, the core of the structure and design idea of the invention is a variable speed ratio paper ejecting connection mode and a switching control mode, and whatever connection mode or structure, the connection and control of the paper ejecting roller and the motor which can realize the switching operation of two or more different speed ratios by referring to the invention are all within the scope of the claims of the invention.

Referring to fig. 3, the present invention is realized by an automatic control switching mechanism and a set of control devices and programs. As shown in fig. 1, 2 and 3,

position sensors

11 and 13 are mounted at positions of the

rotating mechanisms

9 and 10, and function to detect whether or not the shift range is in place, and 11 and 13 are position detection sensor mounting position diagrams with a reduction ratio of 1 (or 3), respectively. The device can also be arranged in other places where detection is convenient, and the signal is connected to the PLC control system through a signal wire.

The gear ratio switching control is explained as follows:

when the rewinding machine finishes reel change and the paper unwinding reel is in the maximum diameter, the diameter value of the paper unwinding reel is obtained through speed and diameter calculation inside the PLC, and the value can also be directly preset to the PLC system through manual operation. The PLC automatically controls and outputs the gear of the reduction gearbox to be a high reduction ratio position according to the numerical comparison, and other rewinding processes are consistent with the common working process. If the diameter is detected to reach the gear conversion diameter area in the working process of the rewinder, if the rewinder is running, whether the rotating speed is the maximum or not is judged, if yes, the working speed is automatically reduced, and if not, the rewinder is continuously operated until the gear is automatically converted to the low-speed-reduction-ratio position after the rewinder is stopped. The gear shifting process can be automatically completed or can be manually changed by an operator by estimating the diameter during the shutdown. When the conversion diameter is set, an area can be set, the PLC automatically completes the conversion action according to whether the area is in the conversion area, if the area conversion exceeds a set value in the work process, the program can automatically reduce the working speed according to the judgment to wait for the automatic gear conversion after the rewinding is finished and the shutdown is finished, only the short-time speed reduction influence can be generated, and in fact, when the situation occurs, an operator can also adopt a method for properly reducing the working speed to solve the problem.

The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.

Claims

1. The utility model provides a variable speed ratio rewinding machine of paper-ejecting roller which characterized in that: the paper-ejecting mechanism comprises a paper-ejecting roller (1) and a driving motor (6), wherein a variable-speed-ratio reduction gearbox (3) is arranged between the paper-ejecting roller (1) and the driving motor (6), the variable-speed-ratio reduction gearbox (3) is respectively connected with the paper-ejecting roller (1) and the driving motor (6) through connecting flanges, and the variable-speed-ratio reduction gearbox (3) comprises a gear-shifting mechanism (4).

2. The rewinding machine with variable speed ratio of the unwinding roller according to claim 1, characterized in that:

the gear shifting mechanism is a conversion handle and an automatic conversion mechanism, the conversion handle is arranged above or on one side of the variable-speed-ratio reduction gearbox (3), the conversion handle is connected with the automatic conversion mechanism, and the automatic conversion mechanism is controlled through an electric signal.

3. The rewinding machine with variable speed ratio of the unwinding roller according to claim 1, characterized in that:

4. The utility model provides a control system of variable speed ratio rewinding machine of paper-ejecting roller which characterized in that:

the automatic gear shifting device comprises a PLC control system and a position detection sensor, wherein when the position detection sensor detects that the diameter value of a paper returning roll reaches a gear shifting diameter area, the position detection sensor of the gear shifting mechanism judges whether the rotating speed is the maximum or not, if so, the working speed is automatically reduced, and if not, the automatic gear shifting device continues to operate until the gear is automatically shifted to a low speed reduction ratio position after the machine is stopped.