Conveying device

Abstract

To provide a carrying device capable of restraining heat generation by surplus energy, and capable of effectively using the surplus energy.SOLUTION: Provided is a conveyance device 100 including an unwinding roll 1 configured to unwind a long workpiece W from a roll body R around which the workpiece W is wound, a drive mechanism X configured to convey the unwound workpiece W, and a power generation motor 2 configured to generate regenerative power in conjunction with rotation of the unwinding roll 1, wherein the power generation motor 2 brakes rotation of the unwinding roll 1 by a regenerative brake generated by the regenerative power.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a transport device that transports a workpiece. [Background technology]

[0002] Conventionally, attempts have been made to effectively utilize surplus energy by, for example, consuming the electricity generated in a motor of a drive control system on the power generation side by a motor of a drive control system on the drive side.For example, Patent Document 1 discloses a motor drive device that includes a plurality of drive control systems, each of which is made up of a motor and a drive amplifier individually provided for each motor, in which rotational drive by the amplifier of a specific drive control system acts on the rotating shaft of another motor to cause that motor to generate electricity, and in which a DC bus of the amplifier connected to the motor of the drive control system on the power generation side is electrically connected to a DC bus of the amplifier of the drive control system on the drive side, so that at least a portion of the electricity generated in the motor of the drive control system on the power generation side is consumed by the motor of the drive control system on the drive side.

[0003] Patent Document 2 discloses a rotary printing press equipped with a motor synchronous drive control device including a plurality of converters that receive AC power on the primary side and output DC power, a DC header line that commonly connects the output sides of each of the plurality of converters, a plurality of inverters that are connected to the DC header line and output AC power on the secondary side, motors connected in one-to-one correspondence with the plurality of inverters, and a controller commonly connected to each of the plurality of inverters. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-334929 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-001192 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, energy conservation has become a key component of social issues, such as the Sustainable Development Goals (SDGs). In the field of workpiece transport devices for webs and other materials, it is necessary to apply a braking force to the unwinding or winding roll to control the tension of the workpiece during transport. When using only friction brakes, such as powder brakes, as the braking mechanism, excess energy generated by the brake is released as heat, resulting in ineffective energy utilization. Furthermore, when a transport device uses only a friction brake mechanism that generates such heat energy as the braking mechanism, the temperature and humidity within the factory fluctuate significantly, leading to production issues such as adverse effects on workpiece quality. Furthermore, large temperature fluctuations within the factory necessitate increasing the capacity of air conditioning equipment in accordance with the amount of heat generated, which is undesirable from an energy conservation perspective.

[0006] The present disclosure is an invention made in consideration of the above circumstances, and has a main object to provide a conveying device that can suppress heat generation due to surplus energy and can make effective use of the surplus energy. [Means for solving the problem]

[0007] The present disclosure provides a conveying device having an unwinding roll that unwinds a long workpiece from a roll body on which the workpiece is wound, a drive mechanism for transporting the unwound workpiece, and a power generating motor that is linked to the rotation of the unwinding roll and is capable of generating regenerative power, wherein the power generating motor brakes the rotation of the unwinding roll by a regenerative brake generated by the regenerative power. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a conveying device that can suppress heat generation due to surplus energy and can make effective use of surplus energy. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram illustrating an example of a conveying device according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] Embodiments of the present disclosure will be described below with reference to the drawings and the like. However, the present disclosure can be implemented in many different forms, and should not be construed as being limited to the description of the embodiments exemplified below. Furthermore, to clarify the explanation, the drawings may schematically depict the width, thickness, shape, etc. of each part compared to the actual form, but these are merely examples and are not intended to limit the interpretation of the present disclosure. Furthermore, in this specification and each drawing, elements similar to those previously described with reference to the preceding drawings will be designated by the same reference numerals, and detailed descriptions may be omitted as appropriate.

[0011] The conveying device of the present disclosure will be described below. Fig. 1 is a schematic diagram showing an example of the conveying device of the present disclosure. The conveying device 100 of the present disclosure has an unwinding roll 1 that unwinds a long workpiece W from a roll body R on which the workpiece W is wound, a drive mechanism X for transporting the unwound workpiece W, and a power generating motor 2 that is linked to the rotation of the unwinding roll 1 and is capable of generating regenerative power. In the present disclosure, the power generating motor 2 brakes the rotation of the unwinding roll 1 by a regenerative brake generated by the regenerative power.

[0012] 1, a generator motor 2 is attached to one end of the unwinding roll 1, and a powder brake 5 is attached to the other end of the unwinding roll 1. The conveying device 100 has, as a drive mechanism X, a conveying section 3 having a feed roll 31 that feeds the workpiece W and a feed motor 32 that drives the feed roll 31 to rotate, and a winding section 4 having a winding roll 41 that winds up the workpiece W and a winding motor 42 that drives the winding roll 41.

[0013] The mechanism of the conveying device in this disclosure will be described in detail. As shown in FIG. 1, a drive mechanism X conveys a workpiece W downstream from the unwinding roll 1. For example, when the winding motor 42 rotates the winding roll 41 or the feed motor 32 rotates the feed roll 31, the workpiece W is conveyed downstream. For example, in a printing press, a certain amount of tension must be applied to the workpiece to achieve high print quality. Therefore, the conveying device requires a brake mechanism to slow down the rotation of the unwinding roll. In the conveying device 100 shown in FIG. 1, the generator motor 2 brakes the rotation of the unwinding roll 1 by regenerative braking using regenerative power generated by the generator motor 2. That is, the rotation of the unwinding roll 1 drives the generator motor 2, converting kinetic energy into electrical energy and generating regenerative power. At this time, the regenerative power generates, and the regenerative brake activates, applying a braking force to the unwinding roll 1, slowing its rotation. The generated regenerative power is returned to the device power supply via, for example, an inverter. In other words, the generator motor 2 serves as at least a part of the braking mechanism.

[0014] One possible way to make effective use of surplus energy is to use a regenerative converter in the unwinding motor that drives the unwinding roll. However, using a regenerative converter requires control synchronized with the power supply phase, which complicates the control system of the device and makes the entire device expensive. Here, a regenerative converter is a converter with a function to return power from the DC side to the AC power supply, in other words, a regenerative function.

[0015] According to the present disclosure, the regenerative braking action of the power-generating motor can brake the rotation of the unwinding roll. This suppresses heat generation compared to when excess energy is released as heat through friction. This suppresses the rise in room temperature in the factory, thereby suppressing the adverse effects of heat on the quality of the workpiece. Energy savings are also achieved because there is no need to increase the capacity of the factory's air conditioning equipment. Furthermore, the electricity generated by the power-generating motor can be effectively utilized in conveying devices with various mechanisms, stabilizing the environment in which the device is used. Furthermore, existing conveying devices that do not have a motor that operates in a regenerative mode, such as conveying devices with a powder brake mechanism, can be easily and inexpensively modified.

[0016] Each component of the conveying device according to the present disclosure will be described in detail below.

[0017] 1. Generator motor The conveying device according to the present disclosure has a power generating motor that is interlocked with the rotation of the unwinding roll and is capable of generating regenerative power. The power generating motor brakes the rotation of the unwinding roll by a regenerative brake that generates the regenerative power. The power generating motor only needs to be interlocked with the rotation of the unwinding roll, and may be attached directly or indirectly to the unwinding roll. The conveying device according to the present disclosure may have one or more of the above power generating motors.

[0018] For a generator motor to form a regenerative brake, for example, an appropriate resistance is loaded on the output side of the generator motor. That is, when the unwinding roll rotates, the drive shaft of the generator motor rotates in conjunction with this, generating electricity. If this electricity is then passed through an appropriate resistance, a braking force is generated in the generator motor itself, braking the drive shaft and slowing (decelerating) the rotation of the unwinding roll. In this case, the braking force can be adjusted by adjusting the resistance value.

[0019] The power generating motor can be a commercially available motor, such as the SKY-HR series and SKY-HG series inner rotor coreless generators (manufactured by Sky Electronics Co., Ltd.) or the REG series three-phase AC generator (manufactured by Coreless Motor Co., Ltd.).

[0020] In the present disclosure, the unwinding motor, which will be described later, may also function as a power generating motor. In this case, the unwinding motor is operated in either a regenerative state or a power running state. Specifically, an inverter is connected to the motor, and a converter is further connected to the inverter. In the power running state, the motor is driven through the inverter. In the regenerative state, the regenerated power is returned from the inverter through the converter to the equipment power supply or the factory power supply.

[0021] The power generated by the generator motor can be returned to the equipment power supply or factory power supply via an inverter, or it can be stored in a battery. Storing the power in a battery reduces the need for modifications to the transport device. Furthermore, the generated power can be used anywhere. Meanwhile, returning the power to the equipment power supply or factory power supply reduces power loss.

[0022] 2. Friction brake mechanism The conveying device according to the present disclosure preferably includes a friction brake mechanism that applies frictional braking force to the unwinding roll. In this case, the unwinding roll is braked by both regenerative braking by the power-generating motor and friction braking by the friction brake mechanism. This allows power generation while controlling tension by the friction brake. It is difficult to precisely control the resistance value (braking force) with regenerative braking by the power-generating motor. Therefore, if the unwinding roll is braked solely by regenerative braking by the power-generating motor, tension control may become unstable, for example, when conveying conditions such as line speed are changed. By performing constant regenerative braking by the power-generating motor and fine braking according to the conveying conditions by the friction brake, the desired tension can be generated even when the conveying conditions are changed. The friction brake mechanism generates frictional force using hydraulics or electromagnetic force, and applies torque to the unwinding roll in the direction opposite to the rotation direction when unwinding the workpiece. An example of a friction brake mechanism is a powder brake.

[0023] Powder brakes utilize frictional force generated by magnetic force. Powder brakes generate braking force by exciting a coil, and the braking force can be adjusted by the strength of the exciting voltage. As shown in FIG. 1, powder brake 5 has, for example, an output shaft 5a that outputs braking force (load torque). The braking force of powder brake 5 is transmitted to the rotating shaft of unwinding roll 1 via output shaft 5a and, if necessary, a gear, thereby applying braking force to unwinding roll 1.

[0024] When the generator motor is installed at one end of the unwinding roll, it is preferable that a powder brake be installed at the other end of the unwinding roll.

[0025] 3. Unwinding roll The conveying device has an unwinding roll that unwinds a long workpiece from a roll body on which the workpiece is wound. The unwinding roll may be driven by an unwinding motor. Alternatively, the unwinding roll may be rotated by the tensile force of the workpiece being conveyed by the drive mechanism. The unwinding motor is attached to the unwinding roll and may function as a power generating motor as described above.

[0026] 4. Drive mechanism The conveying device has a drive mechanism for conveying the unwound workpiece. The drive mechanism has, for example, at least one of a conveying section having a feed roll that feeds the workpiece and a feed motor that rotates and drives the feed roll, and a winding section having a take-up roll that winds up the workpiece and a winding motor that drives the take-up roll. It is preferable that the drive mechanism has both the conveying section and the winding section.

[0027] Examples of feed rolls include conventionally known nip rolls. Nip rolls are arranged on both sides of the workpiece and transport the workpiece by rotating. In addition to transporting the workpiece, they may also perform functions such as adjusting the tension of the workpiece, applying a pressing force to the workpiece, controlling the transport speed and direction of the workpiece, etc. As shown in FIG. 1, the feed roll 31 includes, for example, a first roll 31a and a second roll 31b facing each other. A rotational force may be applied to the first roll 31a by a feed motor 32, and a rotational force may be applied to the second roll 31b by the rotation of the first roll. In other words, the second roll may rotate following the rotation of the first roll. Alternatively, a rotational force may be directly applied to the first roll and the second roll by the feed motor, causing the first roll and the second roll to rotate. The number of feed rolls included in the transport device may be one or more.

[0028] 5.Other The conveying device may have a guide roll that supports only one side of the workpiece. The conveying device may have a tension pickup device to precisely control the tension of the workpiece. The tension pickup device has, for example, a tension pickup roll (tension adjustment roll), a spring that receives the force acting on the tension pickup roll, and a sensor that determines the tension from the deformation of the spring. The tension pickup device may detect the tension using a load cell. The number of guide rolls and tension pickup devices included in the conveying device may be one or more.

[0029] 1, the conveying device 100 according to the present disclosure preferably includes an inverter 7 for returning the power generated by the generator motor 2 to the device power supply or the factory power supply. The conveying device 100 may also include a control unit 6. The control unit controls the generator motor, unwinding motor, feed motor, winding motor, friction brake mechanism, etc., so as to convey the workpiece while unwinding it from the unwinding roll and winding the web onto the winding roll while applying a predetermined set tension to the workpiece.

[0030] 6.Applications The conveying device according to the present disclosure can be used in a printing machine, for example, in a printing factory. When the conveying device is used in a printing machine, the printing machine may further include, in addition to the conveying device, a printing unit that prints on the workpiece, a drying unit that dries the printed workpiece, a cooling unit that cools the workpiece after drying, and the like. The conveying device according to the present disclosure can also be used in a rewinding inspection machine. In a rewinding inspection machine, the unwinding roll and the take-up roll function as a paper feed / discharge unit, and may further include an inspection unit in which an operator performs visual inspection, or an inspection device equipped with a camera or the like. The conveying device according to the present disclosure can also be used in a slitter machine. The slitter machine may further include a slitting unit that cuts a workpiece such as paper, film, or metal foil into a predetermined number of strips parallel to the conveying direction.

[0031] 7. Work The roll body is a long work wound into a roll shape. Examples of the work include continuous bodies such as wire, paper, film, and metal foil. The roll body may have a winding core around which the work is wound. Examples of the winding core include a cylindrical paper tube and a resin tube.

[0032] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are merely examples, and any embodiment that has substantially the same configuration as the technical idea described in the claims of the present disclosure and exhibits similar effects is included within the technical scope of the present disclosure.

[0033] Thus, the present disclosure provides, for example, the following inventions.

[0034] [1] an unwinding roll that unwinds a long work from a roll body on which the work is wound; a drive mechanism for transporting the unwound workpiece; a power generating motor that is interlocked with the rotation of the unwinding roll and is capable of generating regenerative power, The power generating motor brakes the rotation of the unwinding roll by a regenerative brake generated by the regenerative power.

[0035] [2] The conveying device according to [1], further comprising a powder brake for braking the rotation of the unwinding roll.

[0036] [3] The conveying device according to [1] or [2], further comprising an unwinding motor that rotates and drives the unwinding roll.

[0037] [4] The conveying device according to any one of [1] to [3], wherein the conveying device includes an unwinding motor that rotates and drives the unwinding roll, and the unwinding motor also serves as the power generating motor.

[0038] [5] The drive mechanism includes at least one of a transport unit having a feed roll that feeds the workpiece and a feed motor that drives the feed roll to rotate, and a winding unit having a winding roll that winds up the workpiece and a winding motor that drives the winding roll. [1] A transport device described in any one of [1] to [4]. [Explanation of symbols]

[0039] 1 ... Unwinding roll 2... Generator motor 3...Transport section 4... Winding section 5... Powder brake 6...Control section X: Drive mechanism W... Work

Claims

1. an unwinding roll that unwinds a long work from a roll body on which the work is wound; a drive mechanism for transporting the unwound workpiece; a power generating motor that is interlocked with the rotation of the unwinding roll and is capable of generating regenerative power, The power generating motor brakes the rotation of the unwinding roll by a regenerative brake generated by the regenerative power.

2. The conveying device according to claim 1 , further comprising a powder brake for braking the rotation of the unwind roll.

3. The transport device according to claim 1 , further comprising an unwinding motor that rotates and drives the unwinding roll.

4. The transport device according to claim 1 , further comprising an unwinding motor that rotates and drives the unwinding roll, the unwinding motor also serving as the power generating motor.

5. 2. The conveying device according to claim 1, wherein the drive mechanism has at least one of a conveying section having a feed roll that feeds the workpiece and a feed motor that drives the feed roll to rotate, and a winding section having a take-up roll that winds up the workpiece and a winding motor that drives the take-up roll.

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