KR20220118667A - Machine tool - Google Patents

Abstract

The present invention relates to a machine tool capable of preventing all operation from being stopped even when power supply is stopped. According to the present invention, the machine tool comprises: a main body unit for processing a workpiece; a first power supply unit receiving hydrogen as fuel to generate electricity and supplying the generated electricity to the main body unit; a cooling unit connected to the main body unit and the first power supply unit and cooling the main body unit and the first power supply unit by circulating a cooling fluid; and a compression unit connected to the main body unit and the first power supply unit and supplying compressed air to the main body unit and the first power supply unit.

Description

machine tool {MACHINE TOOL}

The present invention relates to a machine tool, and more particularly, to a machine tool equipped with a hydrogen fuel cell system.

In general, a machine used for the purpose of processing metal or non-metallic materials into shapes and dimensions using appropriate tools by various cutting or non-cutting methods or for more precise processing on semi-materials is called a machine tool. . Among these machine tools, a machine tool that generates chips during machining is called a cutting machine tool, and a non-cutting machine tool that does not generate chips during machining is called a metal processing machine. Cutting machine tools include lathes, milling machines, machining centers, drilling machines, boring machines, grinding machines, gear machines, and special machines. Early, drawing, etc.

However, when the three-phase power supply is interrupted due to a power outage or an electrical problem in the conventional machine tools, all operations are stopped, which greatly affects the quality of the workpiece being worked, and causes injuries or injuries due to the fall of the gravity shaft. There are safety issues such as machine damage. In order to prevent this problem, various safety devices have been developed in case electricity is interrupted, but the conventional safety devices also have a problem in that production is fundamentally stopped and productivity is lowered. In addition, as environmental issues such as the power peak system, mandatory use of eco-friendly energy, and greenhouse gas reduction are expanding, it is time to change the power ecosystem.

The background technology of the present invention is disclosed in Republic of Korea Patent Publication No. 10-2097697 (registered on March 31, 2020, title of the invention: an electric drive system for a machine tool and an operating method thereof).

It is an object of the present invention to provide a machine tool that can prevent all operations from being stopped even if the supply of power is interrupted.

An object of the present invention is to provide a machine tool that can be driven through eco-friendly energy such as hydrogen and sunlight.

In order to solve the above problems, a machine tool according to the present invention includes: a main body for processing a work; a first power supply unit for generating electric power by receiving hydrogen as a fuel, and supplying the generated electric power to the body unit; a cooling unit connected to the body unit and the first power supply unit and cooling the body unit and the first power supply unit by circulating a cooling fluid; and a compression unit connected to the main body and the first power source, and supplying compressed air to the main body and the first power source.

The first power supply unit, a storage unit for storing hydrogen; a fuel cell unit generating electric power through an electrochemical reaction between hydrogen supplied from the storage unit and oxygen contained in the compressed air supplied from the compression unit; and a conversion unit provided between the fuel cell unit and the main body unit and converting power generated from the fuel cell unit into AC power.

The first power supply unit may further include a power storage unit provided between the fuel cell unit and the conversion unit and configured to store power generated from the fuel cell unit.

It further includes; a second power supply unit for generating electric power using sunlight and supplying the generated electric power to the main body unit.

The first power supply unit and the second power unit alternately supply power to the main body unit at a set time interval.

The cooling unit may include: a chiller in which the cooling fluid is stored; a branch unit connected to the chiller and branching the cooling fluid supplied from the chiller; a first cooling line connected to the branch part and the main body part and configured to circulate the cooling fluid branched from the branch part to the main body part to cool the main body part; and a second cooling line connected to the branch unit and the first power supply unit and configured to cool the first power supply unit by circulating the cooling fluid branched from the branch unit to the first power supply unit.

The compression unit is connected to the main body portion, the compression unit main body for supplying compressed air to the main body portion; and a compression line unit branched from the compression unit main body and connected to the first power supply unit to supply compressed air to the first power supply unit.

The machine tool according to the present invention can prevent the main body from being integrally interrupted even when the power supply of the external power is interrupted by the first power supply unit and the second power supply unit, thereby preventing a decrease in productivity and loss of life.

In addition, the machine tool according to the present invention can satisfy the greenhouse gas reduction facility conditions according to the expansion of carbon credits as the first power supply unit and the second power supply unit produce electric power using hydrogen and sunlight, respectively, and can prevent environmental pollution have.

In addition, the machine tool according to the present invention can secure the continuous operating state of the main body part as the first power supply unit and the second power supply unit can alternately supply power to the main body unit at a set time interval.

In addition, the machine tool according to the present invention can improve the efficiency of the electrochemical reaction of the fuel cell unit by the cooling unit and the compression unit, so that it is possible to secure a larger capacity power.

In addition, in the machine tool according to the present invention, the cooling unit and the compression unit can be configured by utilizing the equipment installed in the existing machine tool, so that the installation process can be simplified, and the cost associated with the installation can be reduced.

1 is a perspective view schematically showing the configuration of a machine tool according to an embodiment of the present invention.
FIG. 2 is a perspective view of the configuration of a machine tool according to an embodiment of the present invention as viewed from the other side from FIG. 1 .
3 is a front view schematically showing the configuration of a machine tool according to an embodiment of the present invention.
4 is a conceptual diagram schematically showing the configuration of a machine tool according to an embodiment of the present invention.
5 is a conceptual diagram schematically illustrating a configuration of a first power supply unit according to an embodiment of the present invention.
6 is an enlarged view schematically showing the configuration of a cooling unit according to an embodiment of the present invention.
7 is an enlarged view schematically showing the configuration of a compression unit according to an embodiment of the present invention.

Hereinafter, an embodiment of a machine tool according to the present invention will be described with reference to the accompanying drawings.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, definitions of these terms should be made based on the content throughout this specification.

In addition, in this specification, when it is said that a certain part is "connected (or connected)" with another part, it is not only "directly connected (or connected)", but also "directly connected (or connected)" with another member interposed therebetween. Indirectly connected (or connected)” is included. In this specification, when a part "includes (or includes)" a certain component, it does not exclude other components unless otherwise stated, but further "includes (or includes)" other components. means you can

Also, like reference numerals may refer to like elements throughout this specification. Even if the same or similar reference signs are not mentioned or described in a particular drawing, the reference signs may be described based on different drawings. In addition, even if there are parts to which reference numerals are not indicated in specific drawings, those parts may be described based on other drawings. In addition, the relative differences in the number, shape, size, and size of detailed components included in the drawings of the present application are set for convenience of understanding, and do not limit the embodiments and may be implemented in various forms.

Figure 1 is a perspective view schematically showing the configuration of a machine tool according to an embodiment of the present invention, Figure 2 is a perspective view of the configuration of the machine tool according to an embodiment of the present invention viewed from the other side from Figure 1, Figure 3 is a front view schematically showing the configuration of a machine tool according to an embodiment of the present invention, and FIG. 4 is a conceptual diagram schematically showing the configuration of a machine tool according to an embodiment of the present invention.

1 to 4 , a machine tool 1 according to an embodiment of the present invention includes a main body 100 , a first power source 200 , a cooling unit 300 , a compression unit 400 , and a second It includes a power supply unit (500).

The main body 100 receives power from at least one of the first power source 200 , the second power source 500 , and an external power source to process the workpiece. The main body 100 according to an embodiment of the present invention may be exemplified by a machining center (MCT), a CNC lathe, etc. capable of performing various mechanical processing such as milling, drilling, and boring on a workpiece. The main body 100 may be operated by three-phase AC power. In addition, the workpiece processed by the body part 100 may be exemplified by various types of workpieces, such as various parts of automobiles and other industrial machine parts. The main body 100 is not limited to the shape shown in FIGS. 1 to 4 , and various design changes are possible within the technical concept of a processing device capable of processing a workpiece by receiving power.

The first power supply unit 200 is installed on one side of the body unit 100, and receives hydrogen as fuel to generate electric power. The first power supply unit 200 operates the main body unit 100 by supplying the generated power to the main body unit 100 . The first power supply unit 200 may function as an emergency power supply means for supplying power to the body unit 100 when the external power supply is interrupted, and, in contrast, operates the body unit 100 alone. It is also possible to function as the main power supply. Accordingly, the first power supply unit 200 can secure the quality of the work piece being worked regardless of interruption of power supply or unstable supply, and can prevent personal injury and equipment damage due to the fall of the gravity axis.

5 is a conceptual diagram schematically illustrating a configuration of a first power supply unit according to an embodiment of the present invention.

1 to 5 , the first power supply unit 200 according to an embodiment of the present invention includes a storage unit 210 , a fuel cell unit 220 , a power storage unit 230 , and a conversion unit 240 . do.

The storage unit 210 is installed on one side of the body unit 100 to store hydrogen. The storage unit 210 according to an embodiment of the present invention may be formed in the form of a storage container for storing hydrogen in a compressed gas or liquid state. The storage unit 210 may include a material having high rigidity, such as metal, to sufficiently withstand the pressure of stored hydrogen. The storage 210 may be supported by the main body 100 , and may also be supported by a separate support means installed outside the main body 100 . The storage unit 210 may be provided in plurality to store a larger amount of hydrogen. Hydrogen stored in the storage unit 210 may be separated from various compounds including hydrogen through a physical or chemical reaction. For example, hydrogen may be separated by reforming or pyrolysis of compounds such as ammonia gas.

The fuel cell unit 220 is connected to the storage unit 210 and the compression unit 400 to be described later to receive hydrogen and compressed air. The fuel cell unit 220 generates electric power through an electrochemical reaction between hydrogen supplied from the storage unit 210 and oxygen contained in the compressed air supplied from the compression unit 400 .

The fuel cell unit 220 according to an embodiment of the present invention receives hydrogen from the storage unit 210 and decomposes the supplied hydrogen into hydrogen ions (protons) and electrons (oxidation electrode) by an oxidation reaction. ), an electrolyte membrane that is a cation exchange membrane that selectively passes only hydrogen ions, a gas diffusion layer and a separator that transfer electrons, and compressed air is supplied through the compression unit 400 and separated from the hydrogen ions supplied through the electrolyte membrane A unit cell including a cathode (reduction electrode) that causes a reaction to generate water through electrons transferred through the plate and oxygen contained in compressed air may be formed in the form of a fuel cell in which a plurality of layers are stacked. The fuel cell unit 220 generates electric power by the flow of electrons through an external conductor when hydrogen ions and electrons move. The fuel cell unit 220 is a polymer electrolyte membrane fuel cell (PEMFC) using a polymer membrane that can permeate hydrogen ions as an electrolyte, or a solid oxide fuel cell that uses a solid oxide that can transmit oxygen or hydrogen ions as an electrolyte. (SOFC).

The power storage unit 230 is provided between the fuel cell unit 220 and the conversion unit 240 to be described later, and stores power generated from the fuel cell unit 220 . Accordingly, the power storage unit 230 can store power even when the operation is completed, so that power generated from the fuel cell unit 220 can be prevented from being wasted unnecessarily. In addition, as the power storage unit 230 can store power even when the main body unit 100 is operated by another power source, the first power supply unit 200 functions as an emergency power supply means or the second power supply unit 500 ) and alternate motions can be made possible. The power storage unit 230 according to an embodiment of the present invention may be exemplified by a supercapacitor, a battery, or the like, in which both sides are connected to the fuel cell unit 220 and the conversion unit 240 , respectively. The shape of the power storage unit 230 is not limited thereto, and the design may be changed to various types of energy storage devices capable of storing the power generated from the fuel cell unit 220 .

The conversion unit 240 is provided between the fuel cell unit 220 and the body unit 100 , and converts power generated from the fuel cell unit 220 into AC power. That is, the conversion unit 240 is a form of AC power capable of driving the body unit 100 with the DC power generated by the fuel cell unit 220 as the body unit 100 is operated by three-phase AC power. convert to The converter 240 according to an embodiment of the present invention may be exemplified as an inverter that receives DC power and outputs AC power.

The cooling unit 300 is connected to the main body 100 and the first power source 200 , and cools the main body 100 and the first power source 200 by circulating a cooling fluid. More specifically, the cooling unit 300 is a cooling path that circulates the first power supply unit 200 from the cooling device that is essentially installed in the machine tool 1 to prevent thermal deformation of the main shaft provided in the body unit 100 . By branching, the main body part 100 and the first power supply part 200 are cooled at the same time. Accordingly, the cooling unit 300 can utilize the cooling device installed in the machine tool 1 as it is without installing a separate coolant supply means in the fuel cell unit 220 , thereby simplifying the installation work, and cost can be reduced.

6 is an enlarged view schematically showing the configuration of a cooling unit according to an embodiment of the present invention.

Referring to FIG. 6 , the cooling unit 300 according to an embodiment of the present invention includes a chiller 310 , a branching unit 320 , a first cooling line 330 , and a second cooling line 340 .

The chiller 310 is installed on one side of the main body 100 to store the cooling fluid. Here, the cooling fluid may be exemplified by water, air, halon carbon refrigerant hydrocarbon refrigerant (Hydrocarbon), ammonia (NH4), sulfurous acid gas (SO2), and the like. The chiller 310 according to an embodiment of the present invention includes a storage tank in which a cooling fluid is stored, a heat exchanger that re-cools a refrigerant heated by circulating the cooling unit 300 using a heat transfer action, and an operating pressure in the cooling fluid. It may include a fluid pump to apply.

In the chiller 310, both sides are connected to the chiller 310 and the branching part 320 to be described later, respectively, and a main supply part 311 for supplying the cooling fluid cooled by the heat exchanger to the branching part 320, and the circulation is finished A main discharge unit 312 through which the cooling fluid is discharged from the branch unit 320 to the chiller 310 may be installed.

The branch unit 320 is connected to the chiller 310 and branches the cooling fluid supplied from the chiller 310 into a first cooling line 330 and a second cooling line 340 to be described later. The branch unit 320 joins the cooling fluid circulated through the first cooling line 330 and the second cooling line 340 and discharges it to the chiller 310 . The branch part 320 may be supported by being coupled to the body part 100 , and may also be supported by a separate support means (not shown). The branch part 320 according to an embodiment of the present invention may include a case part, a distribution flow path, and a merging flow path.

The case portion is formed to have a substantially box shape to form a schematic appearance of the branch portion 320 .

The distribution passage is installed inside the case unit, one side is connected to the main supply unit 311 , and the other side is the first supply unit 331 of the first cooling line 330 and the second supply unit of the second cooling line 340 ( 340 ). 341) is connected. The distribution passage branches the cooling fluid supplied from the main supply unit 311 into the first supply unit 331 and the second supply unit 341 , respectively.

The merging flow path is installed inside the case unit, one side is connected to the first discharge unit 332 of the first cooling line 330 and the second discharge unit of the second cooling line 340, and the other side is connected to the main discharge unit ( 312) is connected. The merging flow path merges the cooling fluid transferred from the first discharge unit 332 and the second discharge unit 342 , and discharges it to the main discharge unit 311 .

The first cooling line 330 is connected to the branch part 320 and the body part 100 , and circulates the cooling fluid branched from the branch part 320 to the body part 100 to cool the body part 100 . . The first cooling line 330 cools the main body 100 to prevent overheating and thermal deformation of parts such as a main shaft provided in the main body 100 . The first cooling line 330 according to an embodiment of the present invention may include a first supply unit 331 and a first discharge unit 332 .

The first supply unit 331 is formed in the form of a hollow tube having both ends connected to the branch flow path of the branch portion 320 and the body portion 100, respectively. The first supply unit 331 supplies the cooling fluid branched from the branch unit 320 to a cooling passage provided on the main shaft of the body unit 100 .

The first discharge unit 332 is formed in the form of a hollow tube having both ends connected to the merging passages of the body portion 100 and the branch portion 320 , respectively. The first discharge unit 332 flows through the cooling passage of the main body 100 , and receives the cooling fluid discharged from the main body 100 by being heated and delivered to the merging passage of the second branching unit 320 .

The second cooling line 340 is connected to the branch unit 320 and the first power supply unit 200 , and circulates the cooling fluid branched from the branch unit 320 to the first power supply unit 200 to the first power supply unit 200 . cool the The second cooling line 340 cools the first power supply unit 200 to prevent overheating of the fuel cell unit 220 and induces a rapid and efficient electrochemical reaction between hydrogen and oxygen. In this case, the second cooling line 340 may maintain the temperature of the fuel cell unit 220 at approximately 80°C to 90°C. The second cooling line 340 according to an embodiment of the present invention may include a second supply unit 341 and a second discharge unit 342 .

The second supply unit 341 is formed in the form of a hollow tube having both ends connected to the branch flow path of the branch unit 320 and the fuel cell unit 220 , respectively. The second supply unit 341 supplies the cooling fluid branched from the branch flow path of the branch unit 320 to the cooling flow path provided in the fuel cell unit 220 .

The second discharge unit 342 is formed in the form of a hollow tube having both ends connected to the merging flow path of the fuel cell unit 220 and the branch unit 320 , respectively. The second discharge unit 342 flows through the cooling flow path of the fuel cell unit 220 , and receives the cooling fluid discharged from the fuel cell unit 220 , and delivers it to the merging flow path of the second branch unit 320 .

The compression unit 400 is connected to the main body 100 and the first power source 200 , and supplies compressed air to the main body 100 and the first power source 200 . More specifically, the compression unit 400 is a first power supply unit 200 from the compressed air supply device which is essentially installed in the machine tool 1 to drive the parts of the body unit 100 operated by pneumatic such as a cylinder. The compressed air is simultaneously supplied to the main body 100 and the first power supply 200 by branching a path through which the compressed air can be supplied. Accordingly, the compression unit 400 can utilize the compressed air supply device previously installed in the machine tool 1 as it is, thereby simplifying the installation work and reducing the manufacturing cost. In addition, the compression unit 400 may improve the efficiency of the electrochemical reaction of hydrogen and oxygen of the fuel cell unit 220 by providing oxygen required for power generation to the first power supply unit 200 in a compressed state.

7 is an enlarged view schematically showing the configuration of a compression unit according to an embodiment of the present invention.

1 to 7 , the compression unit 400 according to an embodiment of the present invention includes a compression unit body 410 and a compression line unit 420 .

The compression unit body 410 is connected to the body unit 100 , and supplies compressed air to the body unit 100 . Compressor main body 410 according to an embodiment of the present invention includes a compressor that compresses air supplied from the outside to a predetermined pressure, and air that supplies compressed air compressed by the compressor to the main body 100 . It may include a panel.

The compression line unit 420 is branched from the compression unit main body 410 and connected to the first power supply unit 200 , and supplies compressed air to the first power supply unit 200 . The compression line unit 420 according to an embodiment of the present invention may be formed in the form of a hollow tube having one side branched from the air panel and the other side connected to the cathode side of the fuel cell unit 220 . A solenoid valve capable of adjusting the amount of compressed air supplied to the fuel cell unit 220 may be installed in the compression line unit 420 .

The second power supply unit 500 is installed outside the body unit 100, and generates electric power using sunlight. The second power supply unit 500 is electrically connected to the main body unit 100 and supplies the generated power to the main body unit 100 . The specific shape of the second power supply unit 500 is not limited to any one, and various design changes are possible within the technical concept of a solar power generation module that produces power using sunlight. When the second power supply unit 500 generates DC power, the second power supply unit 500 may be connected to the converter 240 to convert the generated DC power into AC power and supply it to the body unit 100 . The second power supply unit 500 may alternately supply power to the body unit 100 at a set time interval from the first power supply unit 200 . For example, the second power supply unit 500 supplies power to the body unit 100 during the daytime as it produces power using sunlight, and the first power supply unit 200 provides the power generation efficiency of the second power supply unit 500 . Power can be supplied to the main body 100 during the falling night. However, the set time in which the first power supply unit 200 and the second power supply unit 500 are alternately operated is not limited thereto, and the design can be changed at various time intervals according to the operating conditions of the machine tool 1 .

Hereinafter, the operation of the machine tool 1 according to the present invention will be described in detail.

1 to 7 , the main body 100 is driven by receiving power from an external power source. In addition, during the daytime, the second power supply unit 500 may generate power using sunlight to supply power to the main body unit 100 together with an external power source.

The fuel cell unit 220 provided in the first power supply unit 200 receives hydrogen supplied from the storage unit 210 and compressed air supplied from the compression unit 400 . The fuel cell unit 200 generates electric power through an electrochemical reaction between hydrogen and oxygen contained in compressed air.

In this process, the cooling unit 300 circulates the cooling fluid through the first cooling passage 330 to cool the main body 100 and at the same time circulates the cooling medium through the second cooling passage 340 to the fuel cell unit. (220) is cooled. In this case, the second cooling passage 340 may maintain the temperature of the fuel cell unit 220 at approximately 80°C to 90°C.

Waste heat generated in the heat exchange process of the cooling unit 300 may be transferred to a separate collection device (not shown) and used for the purpose of supplying hot water such as heating water.

Power generated by the fuel cell unit 200 is transferred to and stored in the power storage unit 230 . The power storage unit 230 transfers the stored power to the conversion unit 240 when the supply of external power is interrupted, or when the power generation efficiency of the second power unit 500 decreases due to night or bad weather. The power transferred to the converter 240 is converted into AC power and supplied to the main body 100 , and the main body 100 may continuously maintain an operating state by the supplied power.

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and those of ordinary skill in the art to which various modifications and equivalent other embodiments are possible. will understand

Therefore, the technical protection scope of the present invention should be defined by the following claims.

1: machine tool 100: body part
200: first power supply 210: storage
220: fuel cell unit 230: power storage unit
240: conversion unit 300: cooling unit
310: chiller 311: main supply
312: main discharge part 320: branch part
330: first cooling line 331: first supply unit
332: first discharge unit 340: second cooling line
341: second supply unit 342: second discharge unit
400: compression unit 410: compression unit body
420: compression line 500: second power supply

Claims (7)

a body part for processing the workpiece;
a first power supply unit for generating electric power by receiving hydrogen as a fuel, and supplying the generated electric power to the body unit;
a cooling unit connected to the body unit and the first power supply unit and cooling the body unit and the first power supply unit by circulating a cooling fluid; and
and a compression unit connected to the main body and the first power source and supplying compressed air to the main body and the first power source.
The method of claim 1,
The first power supply unit,
a storage unit for storing hydrogen;
a fuel cell unit generating electric power through an electrochemical reaction between hydrogen supplied from the storage unit and oxygen contained in the compressed air supplied from the compression unit; and
and a conversion unit provided between the fuel cell unit and the main body unit and converting the power generated from the fuel cell unit into AC power.
3. The method of claim 2,
The first power supply unit,
and a power storage unit provided between the fuel cell unit and the conversion unit and configured to store the electric power generated from the fuel cell unit.
4. The method of claim 3,
A second power supply unit for generating electric power using sunlight and supplying the generated electric power to the main body;
5. The method of claim 4,
The machine tool, characterized in that the first power supply unit and the second power supply unit alternately supply power to the main body at a set time interval.
6. The method according to any one of claims 1 to 5,
The cooling unit,
a chiller in which the cooling fluid is stored;
a branch unit connected to the chiller and branching the cooling fluid supplied from the chiller;
a first cooling line connected to the branch part and the main body part and configured to circulate the cooling fluid branched from the branch part to the main body part to cool the main body part; and
and a second cooling line connected to the branching part and the first power supply part, and cooling the first power supply part by circulating the cooling fluid branched from the branching part to the first power supply part.
6. The method according to any one of claims 1 to 5,
The compression unit,
a compression unit main body connected to the main body and supplying compressed air to the main body; and
and a compression line unit branched from the compression unit main body and connected to the first power supply unit, and supplying compressed air to the first power supply unit.

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