Frequency converter bus control system for papermaking production line

Abstract

The utility model discloses a frequency converter bus control system for a papermaking production line, which comprises a plurality of motors, a plurality of frequency converters, a bus control board and a controller, the motors and the frequency converters are positioned on the site of the production line, the motors and the frequency converters are arranged in one-to-one correspondence, and each motor is electrically connected with the corresponding frequency converter; the bus control board is located on a production line site and electrically connected with the frequency converters. The controller is located in a control room, and the controller is electrically connected with the bus control board and the frequency converters. According to the utility model, the cable wiring design of the frequency converter bus control system is simplified, the laying length of the cable in the frequency converter bus can be shortened, and the manufacturing cost is reduced; and communication reliability can be improved, and later maintenance of the cable is facilitated.

Description

Technical Field

[0001] The utility model relates to a frequency converter control system, in particular to a frequency converter bus control system for a paper production line. Background Art

[0002] In the paper industry, a large number of motors are arranged on a paper production line to control different workstations, and these motors usually use a corresponding number of frequency converters to control the rotation of the motors. As Figure 1 shown, in the related art, a paper production line mainly includes a control system, a plurality of frequency converters and a plurality of motors. The control system is connected to the plurality of frequency converters respectively through a plurality of control lines. The frequency converters are connected to the motors one by one, and each frequency converter is connected to the motor through a motor sensing line and a motor power line respectively; the control system and the plurality of frequency converters are located in a control room, and the plurality of motors are located at the production line site. The disadvantages of the frequency converter bus control system in the above-mentioned paper production line are as follows: 1) The distance between the control room and the production line site is generally very far, the cable laying is too long, and the cost is very high. Especially when the motor power line requires too much current, the cable needs to be a very thick high-voltage cable, and the cost is expensive; 2) There are too many cables, resulting in large communication interference and difficult maintenance. Especially for the signal lines, they are very long from the control room to the production line site. After a failure occurs, it is very difficult to troubleshoot the problem point. Summary of the Utility Model

[0003] The main object of the utility model is to propose a frequency converter bus control system for a paper production line, aiming to solve the technical problems of too long cable laying and inconvenient maintenance due to too many cables in the existing technology.

[0004] To achieve the above object, the frequency converter bus control system for a paper production line proposed by the utility model includes:

[0005] A plurality of motors and a plurality of frequency converters, the motors and the frequency converters are located at the production line site, the motors and the frequency converters are arranged in one-to-one correspondence, and each motor is electrically connected to the corresponding frequency converter;

[0006] A bus control board, the bus control board is located at the production line site, and the bus control board is electrically connected to the plurality of frequency converters respectively;

[0007] A controller, the controller is located in the control room, and the controller is electrically connected to the bus control board and the plurality of frequency converters respectively.

[0008] Optionally, the controller has a power line and a communication line. The controller is electrically connected to any one of the frequency converters through the power line, and adjacent frequency converters are connected through the power line; the controller is connected to the bus control board through the communication line.

[0009] Optionally, the communication line is two CAN communication lines.

[0010] Optionally, each of the frequency converters is disposed on the housing of the corresponding motor.

[0011] Optionally, each of the frequency converters and the corresponding motor form an integrated frequency converter unit.

[0012] Optionally, a plurality of integrated frequency converter units form a control group, and a plurality of control groups are respectively electrically connected to the bus control board.

[0013] Optionally, the bus control board is a bus control box, which includes a box body, a main control board and a plurality of IO boards disposed in the box body. The plurality of IO boards are respectively electrically connected to the main control board. The main control board is used to be electrically connected to the controller, and the IO board is connected to the frequency converter in one-to-one correspondence.

[0014] Optionally, a jack for connecting the controller is disposed on the main control board.

[0015] Optionally, the IO board is provided with a wiring hole for connecting the frequency converter.

[0016] Optionally, there are a plurality of bus control boxes, and the plurality of bus control boxes are respectively communicatively connected to the controller.

[0017] The frequency converter bus control system for a paper production line of the present utility model includes a plurality of motors, a plurality of frequency converters, a bus control board and a controller. Among them, the motors, frequency converters and bus control board are located at the production line site, and the controller is located in the control room. By disposing the frequency converter at the production line site, the wiring length of the cable between the frequency converter and the motor can be shortened; the frequency converter is connected to the bus control board, and using the bus control board as a transfer, the connection of a plurality of frequency converters to the main controller can be realized, shortening the wiring length of the cable between the plurality of frequency converters and the controller, and also improving the reliability of communication. Thus, the frequency converter bus control system of the present utility model can simplify the cable wiring of the frequency converter bus control system, shorten the laying length of the cable in the frequency converter bus, and reduce the construction cost through the integrated design of the circuit; it can also reduce interference, improve the communication reliability, and facilitate the later maintenance of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0019] Figure 1Schematic diagram of a circuit of an embodiment of a frequency converter control system for a related art papermaking production line;

[0020] Figure 2 Schematic diagram of a circuit of an embodiment of a frequency converter bus control system for a papermaking production line according to the present utility model;

[0021] Figure 3 Schematic diagram of the structure of an integrated frequency converter in an embodiment of a frequency converter bus control system for a papermaking production line according to the present utility model;

[0022] Figure 4 Schematic diagram of the structure of a bus control box in an embodiment of a frequency converter bus control system for a papermaking production line according to the present utility model.

[0023] The realization, functional features and advantages of the object of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present utility model.

[0025] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0027] The present utility model provides a frequency converter bus control system for a papermaking production line, which is used to control multiple frequency converters in the papermaking production line. It can be understood that this frequency converter bus control system can also be applied to other systems in which multiple frequency converters control multiple motors.

[0028] In an embodiment of the present utility model, as Figures 2 to 4 shown, the frequency converter bus control system for the papermaking production line includes: multiple motors 320, multiple frequency converters 310, a bus control board 200, and a controller 100. Specifically, for the multiple motors 320 and the multiple frequency converters 310, the motors 320 and the frequency converters 310 are located at the production line site, the motors 320 and the frequency converters 310 are arranged in one-to-one correspondence, and each motor 320 is electrically connected to the corresponding frequency converter 310; the bus control board 200, the bus control board 200 is located at the production line site, and the bus control board 200 is respectively electrically connected to the multiple frequency converters 310; the controller 100, the controller 100 is located in the control room, and the controller 100 is respectively electrically connected to the bus control board 200 and the multiple frequency converters 310.

[0029] Specifically, the controller 100 is communicatively connected to the bus control board 200, the bus control board 200 is communicatively connected to multiple frequency converters 310, and the frequency converter 310 can drive the motor 320 at the production line site to rotate through the motor power line 321. The motor power line 321 is generally a system cable with a large current of hundreds of KW and 380V. The motor 320 will send signals to the frequency converter 310 through the motor sensing line 322, and the bus control board 200 connected to the frequency converter 310 will feedback to the controller 100. By configuring the parameters of the motor 320 in the controller 100, the operation of each motor 320 can be controlled. The signal for the controller 100 to control the frequency converter 310 is an IO signal, that is, the input and output of analog and digital quantities. In an actual application scenario, the distance between the control room and the production line site is relatively far. The controller 100 in the control room is directly connected to the bus control board 200, without each frequency converter 310 being separately connected to the controller 100, which can shorten the length of the wiring cable between the frequency converter 310 and the controller 100. It can be understood that the controller 100 is specifically a control server to separately control the operation of each frequency converter 310, and then control the motor 320 to rotate at the same or different speeds. Each frequency converter 310 and the corresponding motor 320 are electrically connected to the motor 320 through the motor sensing line 322 and the motor power line 321 respectively. Since the frequency converter 310 and the motor 320 are both located at the production line site, the lengths of the motor sensing line 322 and the motor power line 321 can be shortened. Especially for the motor power line 321, the motor power line 321 needs to carry a large current and requires a very thick high-voltage cable. Through the above bus structure, the length of the motor power line 321 can be greatly shortened, reducing the cable cost. In addition, after passing through the bus control board 200, each motor sensing line 322 returns to the controller 100, which can simplify the circuit structure of the controller 100, reduce communication interference, and facilitate maintenance.

[0030] In a specific embodiment, the controller 100 has a power line 110 and a communication line 120. The controller 100 is electrically connected to any frequency converter 310 through the power line 110, and adjacent frequency converters 310 are connected through the power line 110; the controller 100 is connected to the bus control board 200 through the communication line 120. The power line 110 is specifically a power line, including three 380V AC power lines. Only one power line needs to be led out from the control room to the production line site, and then this power line is given to the adjacent frequency converter 310 and transferred to the adjacent frequency converter 310 one by one, so that the controller 100 can supply power to multiple frequency converters 310. The communication line 120 is specifically a motor signal line to return the motor 320 data sequentially returned by the motor 320 through the frequency converter 310 and the bus control board 200. Specifically, the communication line 120 is two CAN communication lines 120. It can be understood that the number of the communication lines 120 can be flexibly increased or decreased to one according to actual needs.

[0031] In a specific embodiment, each frequency converter 310 is arranged on the outer shell of the corresponding motor 320. The frequency converter 310 is directly arranged on the outer shell of the motor 320, and the outer shell of the motor 320 is used to dissipate heat from the frequency converter 310, saving the heat dissipation cost of the frequency converter 310 and shortening various wirings of the motor 320. The outer shell of the motor 320 can be metal and alloy with a heat dissipation structure. The heat dissipation structure is specifically a plurality of heat sinks. Specifically, each frequency converter 310 and the corresponding motor 320 form a frequency converter integrated machine 300. At this time, various wires connecting the motor 320 are integrated inside the frequency converter integrated machine 300, further shortening various wirings of the motor 320 and reducing communication interference.

[0032] In a specific embodiment, multiple frequency converter integrated machines 300 form a control group, and multiple control groups are respectively electrically connected to the bus control board 200. Specifically, every 5 or more frequency converter integrated machines 300 can form a control group. The number of the frequency converter integrated machines 300 is configured in groups according to the distance between the frequency converter integrated machines installed on site, and there is no limit here. By grouping the frequency converter integrated machines 300, the cable laying route can be better designed, which is beneficial to the integrated setting.

[0033] Specifically, the bus control board 200 is a bus control box, which includes a box body 210, a main control board 220 and multiple IO boards 230 arranged in the box body 210. The multiple IO boards 230 are electrically connected to the main control board 220 respectively. The main control board 220 is used to be electrically connected to the controller 100, and the IO board 230 is connected to the frequency converter 310 in a one-to-one correspondence. The bus control box is relatively small in volume. The main control board 220 therein can be communicatively connected to the controller 100 in the control room through a communication line 120, and the IO board 230 is communicatively connected to each frequency converter 310 through multiple control lines 201 respectively. The number of IO boards 230 corresponds to the number of frequency converter integrated machines 300, that is, each IO board 230 corresponds to one frequency converter integrated machine 300. The multiple IO boards 230 are arranged in an array. Specifically, the IO board 230 is provided with wiring holes 231 for connecting the frequency converter 310. The number of the wiring holes 231 is two. Specifically, the main control board 220 is provided with jacks 240 for connecting the controller 100. The number of the jacks 240 is two. The two jacks 240 are located on the first side of the IO boards 230 arranged in an array, and the main control board 220 is located on the second side of the IO boards 230 arranged in an array. The first side and the second side are adjacent. Specifically, the first side is either the left or right side of the IO boards 230 arranged in an array, and the second side is the upper side of the IO boards 230 arranged in an array.

[0034] In a specific embodiment, there are multiple bus control boxes, and the multiple bus control boxes are respectively communicatively connected to the controller 100. Specifically, every 5 or more bus control boxes. For example, a paper-making production line has 50 motors 320, which can be made into 50 frequency converter integrated machines and 5 bus control boxes, and each bus control box controls 10 frequency converter integrated machines. The number of the bus control boxes is configured according to the number of frequency converter integrated machines installed on site, and no limit is set here. By setting multiple bus control boxes, the cable laying route can be designed better, which is beneficial to the integrated setting.

[0035] In summary, the frequency converter bus control system for a paper-making production line of the present utility model has at least the following advantages:

[0036] 1. Fabricate the frequency converter integrated machine 300 on site, fix the on-site frequency converter 310 on the motor 320 housing, use the motor 320 housing to dissipate heat for the frequency converter 310, and the various wires connecting the motor 320 are integrated inside the frequency converter integrated machine, which is convenient for the frequency converter 310 to dissipate heat, shortens the various wirings of the motor 320, and reduces the communication interference;

[0037] 2. Manufacture a bus control box. Through the transfer of the bus control box, the control signals in the controller 100 in the control room are sent to each inverter 310 on-site, and the operation of each motor 320 can be controlled through the inverter 310.

[0038] 3. Greatly save the length and quantity of the cables pulled from the control room to the production line site, especially the expensive high-current motor power line 321.

[0039] 4. Simplify the cable wiring, making the later maintenance simpler and the anti-interference ability stronger.

[0040] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A frequency converter bus control system for a paper-making production line, characterized in that, Including: Multiple motors and multiple frequency converters, where the motors and frequency converters are located at the production line site, the motors and the frequency converters are arranged in one-to-one correspondence, and each motor is electrically connected to the corresponding frequency converter; A bus control board, which is located at the production line site and is electrically connected to multiple frequency converters respectively; A controller, which is located in the control room and is electrically connected to the bus control board and multiple frequency converters respectively.

2. The frequency converter bus control system for a paper-making production line according to claim 1, wherein The controller has a power line and a communication line. The controller is electrically connected to any one of the frequency converters through the power line, and adjacent frequency converters are connected through the power line; the controller is connected to the bus control board through the communication line.

3. The frequency converter bus control system for a paper-making production line according to claim 2, wherein The communication line is two CAN communication lines.

4. The frequency converter bus control system for a paper-making production line according to claim 1, characterized in that, Each frequency converter is arranged on the outer shell of the corresponding motor.

5. The frequency converter bus control system for a paper-making production line according to claim 1, characterized in that, Each frequency converter and the corresponding motor form a frequency converter integrated machine.

6. The frequency converter bus control system for a paper-making production line according to claim 5, characterized in that, Multiple frequency converter integrated machines form a control group, and multiple control groups are electrically connected to the bus control board respectively.

7. The frequency converter bus control system for a paper-making production line according to claim 1, wherein The bus control board is a bus control box, which includes a box body, a main control board and multiple IO boards arranged in the box body. The multiple IO boards are electrically connected to the main control board respectively. The main control board is used to be electrically connected to the controller, and the IO board is connected to the frequency converter in one-to-one correspondence.

8. The frequency converter bus control system for a paper-making production line according to claim 7, characterized in that, A jack for connecting the controller is arranged on the main control board.

9. The frequency converter bus control system for a paper-making production line according to claim 7, characterized in that, The IO board is provided with a wiring hole for connecting the frequency converter.

10. The frequency converter bus control system for a paper production line according to claim 7, characterized in that, There are multiple bus control boxes, and multiple bus control boxes are respectively communicatively connected to the controller.

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