Machine tool spin window device and control method

Abstract

A spin window is installed on one side of the door of a machine tool to allow observation of the interior, and a detection sensor is installed at the bottom of the spin window to detect the presence of an operator, and an infrared sensor is installed on the glass surface of the spin window to detect the amount of cutting fluid adhering to the glass surface. An air nozzle is installed on the main body of the machine tool to form an air curtain in front of the spin window. By receiving signals from the detection sensor and the infrared sensor to control the rotation of the air curtain and the spin window, the spin window is operated only when an operator is present in front of the door and cutting fluid adheres to the spin window, making it impossible to observe the interior through the spin window. Therefore, by ensuring that the spin window operates only when the operator is observing the interior, unnecessary operation of the spin window is prevented, thereby saving energy, increasing the durability of the spin window, and further enabling a spin window device that allows for clearer observation of the interior of the machine tool.

Description

Technology Field

[0001] The present invention relates to a spin window installed on the door of a machine tool to observe the internal processing area, and to a device and method for maintaining the transparency of the spin window when an operator observes the interior of the machine tool through the spin window. Background Technology

[0002] Generally, machine tools that perform machining operations such as high-speed cutting or grinding generate heat in the tool and workpiece machining areas as the tool or workpiece rotates at high speeds, and also produce machining chips separated from the workpiece. This heat generation and machining chips reduce the precision of the machining operation. Therefore, to prevent this, cutting fluid is sprayed onto the machining area. At this time, the sprayed cutting fluid and chips are scattered along with the high-speed rotation of the workpiece or tool and are dispersed within the machining area.

[0003] Meanwhile, machine tools are equipped with doors containing transparent glass that block the processing area from the outside to prevent cutting fluid and chips generated in the processing area from being discharged to the outside during processing operations and to ensure the safety of the operator.

[0004] However, with such doors, viscous cutting fluid and chips scatter during processing operations and contaminate the inner surface of the transparent glass, making it very difficult or impossible for the operator to observe the inside of the processing area. Therefore, to prevent this, a spin window with a transparent glass surface that rotates at high speed is installed on the door, so that the cutting fluid or chips are removed by the rotation of the spin window, allowing the operator to observe the inside of the processing area.

[0005] However, since these conventional spin windows are operated by the operator manually selecting an operating switch regardless of the amount of splashing cutting fluid, in some cases, the operating switch is selected even when the operator is absent, or the window continues to operate even when there is no splashing of cutting fluid, resulting in power loss and damage to related components, including the glass surface of the spin window. In addition, there is a problem in that the operating switch may malfunction or be misoperated if the operator touches it while it is contaminated with foreign matter during operation.

[0006] Meanwhile, Patent Document 1, which is introduced as prior art, discloses installing a camera in a part of the spin window to observe the inside of the spin window. Although this allows for more precise observation of the internal processing area only when there is no adhesion of cutting fluid to the glass surface of the spin window, it has limitations in that it cannot overcome problems such as power loss or durability resistance caused by the continuous rotation of the spin window.

[0007] In addition, Patent Document 2 discloses only a means for rotating a spin window, but still has limitations in that it cannot overcome the problems associated with the continuous rotation of the spin window.

[0008] In addition, patent documents 3 to 6 disclose installing a spin window merely to observe the inside of the machining area of ​​a machine tool, but they still have limitations in that they cannot overcome the problems associated with the spin window continuously rotating.

[0009] Meanwhile, Patent Document 7 discloses a structure in which an air nozzle is installed in a spin window, but this method has the problem that it is very difficult or complicated to install a pipe to supply high-pressure air to the door when the door with the spin window installed slides or rotates to open or close, and also has the problem that the interior of the spin window becomes complicated and the glass surface area of ​​the spin window is narrowed due to the installation of pipes and nozzles inside the spin window, thereby hindering the function of observing the interior. Prior art literature

[0010] Korean Published Patent No. 10-2019-0087407, Korean Published Patent No. 10-2009-0042069, Korean Published Patent No. 10-2009-0042064, U.S. Patent Publication No. 5161055, U.S. Patent Publication No. 5927010, Japanese Published Patent No. 2003-145386, Japanese Published Patent No. Hei 7-266183 The problem to be solved

[0011] The present invention aims to solve the above-mentioned problems. The objective of the present invention is to reduce power consumption associated with the operation of the spin window by ensuring that the spin window operates only when an operator observes the inside of the machine tool, and further to further reduce energy consumption and strengthen the durability of the spin window by differentiating the operation status and operation stage based on the presence or absence of an operator and the degree of contamination of the spin window. means of solving the problem

[0012] A spin window device for a machine tool to achieve the purpose of the present invention is,

[0013] In a machine tool having a spin window with a transparent glass surface for observing the interior installed on one side of a door that opens and closes the internal processing area of ​​the machine tool,

[0014] A detection sensor for detecting the presence of a worker in front is installed on one side of the vertical lower portion of the above spin window, and

[0015] An infrared sensor for detecting the amount of cutting fluid adhering to the inner surface of the glass surface is installed on the outer side of the glass surface of the spin window, and

[0016] It includes a control device that controls a spin window drive unit electrically connected to receive signals from the above detection sensor and the above infrared sensor, and rotates the spin window when a worker is detected in front by the above detection sensor and cutting fluid adheres to the glass surface of the spin window and the amount of infrared detected by the above infrared sensor becomes below a predetermined threshold.

[0017] In a preferred embodiment, several air nozzles are installed on one side of the main body of the machine tool to spray high-pressure air toward the front of the glass surface of the spin window to form an air curtain between the spin window and the internal processing area, and at the same time remove cutting fluid adhered to the glass surface of the spin window, and the control device further includes an air curtain driving unit that sprays high-pressure air through the air nozzles when the amount of infrared radiation detected by the infrared sensor becomes below a predetermined reference value.

[0018] In a preferred embodiment, the infrared sensor is characterized by comprising a light-emitting part that emits infrared rays toward the inner surface of the glass surface of the spin window, and a light-receiving part that receives the amount of infrared rays reflected when the infrared rays emitted from the light-emitting part strike the glass surface.

[0019] In a preferred embodiment, the control device is characterized as being part of the numerical controller (NC) of a machine tool.

[0020] In a preferred embodiment, the control device is characterized by operating an air curtain drive unit that sprays high-pressure air through an air nozzle when the amount of infrared radiation detected by the infrared sensor is below a predetermined first reference value, and simultaneously operating the air curtain drive unit and the spin window drive unit when the amount of infrared radiation detected by the infrared sensor is below a predetermined second reference value.

[0021] In a preferred embodiment, the control device is characterized in that the first reference value is set to be greater than the second reference value.

[0022] Meanwhile, a spin window control method for a machine tool to achieve the objective of the present invention is,

[0023] A method for controlling a spin window of a machine tool, comprising: a spin window having a transparent glass surface for observing the interior on one side of a door that opens and closes an internal processing area of ​​the machine tool; a detection sensor for detecting the presence of an operator in front on one side of the vertical lower side of the spin window; an infrared sensor for detecting the amount of cutting fluid adhering to the inner surface of the glass surface on the outer side of the glass surface of the spin window; and a control device for controlling a spin window drive unit by receiving signals from the detection sensor and the infrared sensor.

[0024] A worker detection step (S20) that detects whether a worker is present in front of the spin window through a detection sensor installed on the front of the door, and if it is detected that no worker is present in front of the spin window, returns to the starting position without operating the spin window, and proceeds to the next step if a worker is present in front of the spin window;

[0025] An infrared detection step (S30) for detecting the amount of cutting fluid adhered to the surface of the spin window glass by emitting infrared rays from a emitting part of an infrared sensor installed on the front surface of the spin window glass towards the inner surface of the spin window glass, and detecting the amount of infrared rays received by a receiving part after the emitted infrared rays strike the glass surface and are reflected;

[0026] It includes a spin window driving step (S50) in which, if the amount of infrared radiation detected in the infrared detection step (S30) is less than or equal to a preset secondary reference value, a spin window driving unit is driven to rotate the glass surface of the spin window by a rotary motor, and if the amount of infrared radiation detected is greater than the preset secondary reference value, the spin window returns to the starting position.

[0027] In a preferred embodiment, the machine tool is provided with a plurality of air nozzles on one side of the main body of the machine tool that spray high-pressure air toward the front of the glass surface of the spin window to form an air curtain and simultaneously remove cutting fluid adhered to the glass surface of the spin window, and a control device that receives signals from the detection sensor and the infrared sensor to control the air curtain drive unit and the spin window drive unit, and further includes an air curtain drive step (S40) in which, if the amount of infrared radiation detected in the infrared detection step (S30) is less than or equal to a preset first reference value, the air curtain drive unit is operated to spray high-pressure air through the air nozzles to form an air curtain on the front of the spin window, and if the amount of infrared radiation detected is greater than the preset first reference value, the machine tool does not proceed to the next step and returns to the starting position.

[0028] The spin window driving step (S50) is characterized by further including driving the air curtain driving unit when the amount of infrared radiation detected in the infrared detection step (S30) is less than or equal to a preset secondary reference value.

[0029] In a preferred embodiment, the method further includes a spin window selection step (S10) which determines whether the operation of the selection switch is performed prior to the operator detection step (S20), performs the operation of the next step if it is determined that the selection switch is turned on, and terminates without further executing the spin window operation if it is determined that the selection switch is turned off.

[0030] In a preferred embodiment, the first reference value is set to be greater than the second reference value.

[0031] Meanwhile, as another method for achieving the objective of the present invention, a spin window control method for a machine tool is,

[0032] A method for controlling a spin window of a machine tool, comprising: a spin window having a transparent glass surface for observing the interior on one side of a door that opens and closes an internal processing area of ​​the machine tool; a detection sensor on one side of the vertical lower portion of the spin window for detecting the presence of an operator in front; an infrared sensor on the outer side of the glass surface of the spin window for detecting the amount of cutting fluid adhering to the inner surface of the glass surface; multiple air nozzles on one side of the main body of the machine tool for spraying high-pressure air toward the front of the glass surface of the spin window to form an air curtain while simultaneously removing cutting fluid adhering to the glass surface of the spin window; and a control device that receives signals from the detection sensor and the infrared sensor to control an air curtain driving unit and a spin window driving unit.

[0033] A worker detection step (S20) that detects whether a worker is present in front of the spin window through a detection sensor installed on the front of the door, and if it is detected that no worker is present in front of the spin window, returns to the starting position without operating the spin window, and proceeds to the next step if a worker is present in front of the spin window;

[0034] An infrared detection step (S30) for detecting the amount of cutting fluid adhered to the surface of the spin window glass by emitting infrared rays from a emitting part of an infrared sensor installed on the front surface of the spin window glass towards the inner surface of the spin window glass, and detecting the amount of infrared rays received by a receiving part after the emitted infrared rays strike the glass surface and are reflected;

[0035] A spin window driving step (S50) in which, if the amount of infrared radiation detected in the infrared detection step (S30) is less than or equal to a preset first reference value, a spin window driving unit that rotates the glass surface of the spin window by a rotary motor is driven, and if the amount of infrared radiation detected is greater than the preset first reference value, the spin window driving step (S50) returns to the starting position without proceeding to the next step;

[0036] It includes an air curtain driving step (S40) in which, if the amount of infrared radiation detected in the infrared detection step (S30) is less than or equal to a preset secondary reference value, an air curtain driving unit is operated to form an air curtain on the front of the spin window by spraying high-pressure air through an air nozzle in addition to driving the spin window driving unit, and if the amount of infrared radiation detected is greater than the preset secondary reference value, the air curtain returns to the starting position. Effects of the invention

[0037] The present invention reduces power consumption associated with the operation of the spin window and improves the operator's convenience of operation by automatically detecting whether an operator is in front of the spin window and enabling operation.

[0038] In addition, the present invention further improves the transparency of the spin window by executing the operation of the air curtain and the spin window in stages according to the degree of adhesion of the cutting fluid adhered to the spin window, thereby enabling the operator to observe the interior of the processing area more clearly. Brief explanation of the drawing

[0039] FIG. 1 is a perspective view of a machine tool with a spin window applied thereto, as an embodiment of the present invention. FIG. 2 is an enlarged perspective view of a spin window as an embodiment of the present invention. FIG. 3 is a conceptual diagram of the installation of an infrared sensor as an embodiment of the present invention. FIG. 4 is a conceptual diagram of an air curtain as an embodiment of the present invention. FIG. 5 is a block diagram of a control device as an embodiment of the present invention. FIG. 6 is a control flow diagram as an embodiment of the present invention. FIG. 7 is a control flow diagram as another embodiment of the present invention. Specific details for implementing the invention

[0040] Embodiments of the present invention will be described below with reference to the attached drawings.

[0041] FIG. 1 is a perspective view of a machine tool with a spin window (20) applied thereto as an embodiment of the present invention. As shown in FIG. 1, the present invention installs a spin window (20) having a transparent glass surface (21) that allows observation of the interior on one side of a door (10) that opens and closes the internal processing area of ​​the machine tool and is installed on the front of the machine tool. In addition, a detection sensor (40) that detects the presence of an operator in front is installed on one side of the vertical lower side of the spin window (20). The detection sensor (40) is a type of proximity switch that detects the presence of an object within a certain distance and angle range, and detects the presence of an operator when the operator is in front of the spin window (20) and transmits a signal to a control device (60).

[0042] FIG. 2 is an enlarged perspective view of a spin window (20) as an embodiment of the present invention. As shown in FIG. 2, an infrared sensor (30) is installed on the outer side of the glass surface (21) of the spin window (20) to detect the amount of cutting fluid adhering to the inner surface of the glass surface (21).

[0043] Meanwhile, the spin window (20) is a known conventional spin window (20) structure and consists of an inner glass surface (21) installed inside an internal processing area and rotated by a rotary motor (22), and an outer glass surface (21) fixed outside the processing area. The infrared sensor (30) is installed on the outer glass surface (21).

[0044] In addition, as another embodiment of the present invention, the spin window (20) may be configured with a single fixed glass surface (21), and a wiper blade that rotates the surface of the glass surface (21) by a rotary motor (22) may be installed on the inner surface of the fixed glass surface (21) in the processing area side.

[0045] FIG. 3 is a conceptual diagram of the installation of an infrared sensor (30) as an embodiment of the present invention. As shown in FIG. 3, the infrared sensor (30) utilizes the refractive index of infrared rays and consists of a light-emitting part (31) that emits infrared rays toward the inner surface of a glass surface (21), and a light-receiving part (32) that receives the amount of infrared rays reflected when the infrared rays emitted from the light-emitting part (31) strike the glass surface (21). Accordingly, when cutting fluid scattered from the processing area adheres to the inner surface of the glass surface (21) of the spin window (20), the infrared rays irradiated from the light-emitting part (31) are reflected by the glass surface (21) to which the cutting fluid adheres and are received by the light-receiving part (32). However, diffuse reflection occurs due to the surface shape of the cutting fluid adhered to the glass surface (21) and the cutting fluid having a different refractive index from the glass surface (21), so only some of the infrared rays are received by the light-receiving part (32). That is, the more cutting fluid adhered to the glass surface (21) of the spin window (20), the more severe the diffuse reflection becomes, and the less infrared light is received by the light receiving part (32).

[0046] FIG. 4 is a conceptual diagram of an air curtain (50) as an embodiment of the present invention. As shown in FIG. 4, several air nozzles (51) are installed on one side of the main body of a machine tool to spray high-pressure air toward the front of the glass surface (21) of the spin window (20) to form an air curtain (50) between the spin window (20) and the internal processing area, and at the same time remove cutting fluid adhered to the glass surface (21) of the spin window (20).

[0047] Meanwhile, the air nozzle (51) may be installed directly on the spin window (20), but doing so would require installing a pipe to supply high-pressure air to the door that moves to open and close, which would make the structure of the door (10) complex, and also require installing a pipe and nozzle inside the spin window (20), which would make the inside of the spin window (20) complex and narrow the glass surface (21) area of ​​the spin window (20), thereby hindering the function of observing the inside. Therefore, in the present invention, the air nozzle (51) is installed on one side of the main body of the machine tool to form an air curtain (50) on the front of the spin window (20).

[0048] FIG. 5 is a block diagram of a control device (60) as an embodiment of the present invention. As shown in FIG. 5, the present invention configures a separate control device (60) to control the spin window (20) in a manner that consumes less power. This control device (60) may be part of the NC (numerical controller) of a machine tool. The control device (60) is electrically connected to receive a signal from the detection sensor (40) installed on the front of the door (10) to detect the presence or absence of an operator, and is also electrically connected to an infrared sensor (30) installed on the glass surface (21) of the spin window (20) to detect the amount of cutting fluid attached to the glass surface (21). In addition, the control device (60) receives electrical signals from the detection sensor (40) and the infrared sensor (30) and controls the air curtain drive unit (61) that forms an air curtain (50) by spraying high-pressure air through the air nozzle (51) according to the control method described later, and also controls the spin window drive unit (62) that drives the rotation motor (22) of the spin window (20).

[0049] Meanwhile, when the amount of infrared radiation detected by the infrared sensor (30) is less than or equal to a predetermined first reference value, the control device (60) drives the air curtain drive unit (61) to form an air curtain (50) on the front surface of the glass (21) of the spin window (20) through the air nozzle (51) from the high-pressure air supply device (not shown).

[0050] In addition, when the amount of infrared radiation detected by the infrared sensor (30) is less than or equal to a predetermined secondary reference value, the control device (60) drives the spin window drive unit (62) so that the rotation motor (22) of the spin window (20) rotates the inner glass surface (21) of the spin window (20) that is rotatably installed.

[0051] Meanwhile, at this time, the control device (60) sets the first reference value, which is compared with the amount of infrared detected by the infrared sensor (30), to be greater than the second reference value. Accordingly, depending on the amount of cutting fluid adhered to the glass surface (21) of the spin window (20), the air curtain drive unit (61) is first driven to form an air curtain (50) on the front surface of the glass surface (21) of the spin window (20), and if more cutting fluid is adhered to the glass surface (21), the spin window drive unit (62) is additionally driven so that the rotary motor (22) rotates the inner glass surface (21) of the spin window (20) to completely remove the cutting fluid adhered to the glass surface (21).

[0052] The operation of the present invention configured as described above and the control method thereof will be explained below. FIG. 6 is a control flowchart as an embodiment of the present invention.

[0053] First, the spin window selection step (S10) is executed.

[0054] This step is a step in which the control device (60), as illustrated in FIG. 6, determines whether to operate a selection switch (not shown) installed on one side of the machine tool. If the operator turns the selection switch on, the operation of the next step is performed, and if the selection switch is turned off, the operation of the spin window (20) is not performed any further and is terminated.

[0055] Meanwhile, as another embodiment, the selection switch may be omitted, and the selection switch function may be set to remain in a constantly turned-on state by default starting from the start of operation of the machine tool.

[0056] Next, the worker detection step (S20) is executed.

[0057] In this step, when the automatic spin window (20) function is selected in the spin window selection step (S10), the presence of a worker in front of the spin window (20) is detected through a detection sensor (40) installed on the front of the door (10). If it is detected that no worker is present in front of the spin window (20), the spin window (20) is not operated and the process returns to the starting position. If a worker is present in front of the spin window (20), the process proceeds to the next step.

[0058] Next, the infrared detection step (S30) is executed.

[0059] This step involves detecting the amount of cutting fluid attached to the rear surface of the glass surface (21) through an infrared sensor (30) installed on the front surface of the glass surface (21) of the spin window (20). The emitting part (31) of the infrared sensor (30) emits infrared light toward the inner surface of the glass surface (21) of the spin window (20), and detects the amount of infrared light that is received by the receiving part (32) after the emitted infrared light strikes the glass surface (21) and reflects. At this time, the amount of infrared light received through the receiving part (32) decreases as the amount of cutting fluid attached to the glass surface (21) increases due to diffuse reflection caused by the refractive index of the infrared light.

[0060] Next, the air curtain driving step (S40) is executed.

[0061] This step is performed when the amount of infrared detected in the infrared detection step (S30) is reduced to a preset primary threshold, that is, when cutting fluid adheres to the glass surface (21) of the spin window (20) to the extent that it can obstruct the operator's view, by driving an air curtain drive unit that sprays high-pressure air through the air nozzle (51) from a high-pressure air supply device (not shown), so that the high-pressure air sprayed from the air nozzle (51) forms an air curtain (50) on the front of the spin window (20). The air curtain (50) prevents cutting fluid scattered from the processing area from adhering to the glass surface (21) of the spin window (20) and at the same time removes the cutting fluid adhering to the glass surface (21).

[0062] Meanwhile, if the amount of infrared detected in the infrared detection step (S30) is greater than the preset first reference value, it is determined that the amount of cutting fluid attached to the glass surface (21) of the spin window (20) is not at a level that would obstruct the operator's view, so the process does not proceed to the next step and returns to the starting position.

[0063] Next, the spin window driving step (S50) is executed.

[0064] This step involves driving the spin window drive unit (62) to rotate the rotation motor (22) of the spin window (20) when the amount of infrared radiation detected in the infrared detection step (S30) is reduced to a preset secondary threshold, that is, when the cutting fluid adhering to the glass surface (21) of the spin window (20) is still large enough to obstruct the operator's view even after the air curtain drive unit (61) has been operated to form the air curtain (50). As the spin window drive unit (62) is driven, the rotation motor (22) rotates the glass surface (21) of the spin window (20) at high speed, thereby removing the cutting fluid adhering to the glass surface (21) by centrifugal force.

[0065] On the other hand, if the amount of infrared detected in the infrared detection step (S30) is greater than the preset secondary reference value, the spin window driving unit (62) is not driven and returns to the starting position. This is because the amount of cutting fluid attached to the glass surface (21) of the spin window (20) is not large enough to rotate the spin window (20).

[0066] Meanwhile, as another embodiment, as shown in FIG. 7, if the amount of infrared detected by the infrared sensor (30) is less than the first reference value, the spin window driving unit (62) is driven to rotate the inner glass surface (21) of the spin window (20) to remove the cutting fluid attached to the glass surface (21), and then, if the amount of infrared detected by the infrared sensor (30) is less than the second reference value because more cutting fluid is attached to the glass surface (21), the air curtain driving unit (61) is driven simultaneously with the driving of the spin window driving unit (62) to form an air curtain (50) on the front surface of the glass surface (21) of the spin window (20), thereby completely removing the cutting fluid attached to the glass surface (21).

[0067] In this way, by repeating the above steps, the cutting fluid adhered to the glass surface (21) of the spin window (20) is more completely removed, allowing the operator to accurately observe the processing status of the workpiece inside the processing area through the transparent glass surface (21) of the spin window (20).

[0068] In addition, the present invention automatically detects whether a worker is in front of the spin window (20) and operates it, thereby reducing power consumption associated with the operation of the spin window (20) and improving the convenience of operation for the worker.

[0069] In addition, the present invention further improves the transparency of the spin window (20) by performing the operation of the air curtain (50) and the spin window (20) in stages according to the degree of adhesion of the cutting fluid adhered to the spin window (20), thereby allowing the operator to observe the inside of the processing area more clearly. Explanation of the symbols

[0070] 10 : Door 20 : Spin Window 21 : Glass surface 22 : Rotary motor 30: Infrared sensor 31 : Light-emitting part 32 : Light receiving unit 40 : Detection sensor 50 : Air curtain 51 : Air nozzle 60: Control unit 61: Air curtain drive unit 62 : Spin window drive unit S10: Spin Window Selection Step S20: Worker detection stage S30: Infrared detection stage S40: Air curtain driving stage S50: Spin window driving stage

Claims

Claim 1 A spin window device of a machine tool, comprising: a spin window having a transparent glass surface for observing the interior of the machine tool; a detection sensor for detecting the presence of an operator in front is installed on one side of the spin window; an infrared sensor for detecting the amount of cutting fluid adhering to the inner surface of the glass surface is installed on the outer side of the glass surface of the spin window; and a control device for controlling a spin window drive unit that rotates the spin window when the amount of infrared fluid detected by the infrared sensor becomes less than or equal to a predetermined threshold value, wherein the detection sensor detects an operator in front and cutting fluid adheres to the glass surface of the spin window. Claim 2 A spin window device of a machine tool according to claim 1, wherein a plurality of air nozzles are installed on one side of the main body of the machine tool to spray high-pressure air toward the front of the glass surface of the spin window to form an air curtain between the spin window and an internal processing area, and at the same time remove cutting fluid adhered to the glass surface of the spin window, and the control device further comprises an air curtain driving unit that sprays high-pressure air through the air nozzles when the amount of infrared radiation detected by the infrared sensor becomes less than or equal to a predetermined reference value. Claim 3 A spin window device for a machine tool according to claim 1, wherein the infrared sensor comprises a light-emitting part that emits infrared rays toward the inner surface of the glass surface of the spin window, and a light-receiving part that receives the amount of infrared rays reflected when the infrared rays emitted from the light-emitting part strike the glass surface. Claim 4 A spin window device for a machine tool according to claim 1, characterized in that the control device is part of the NC (numerical controller) of the machine tool. Claim 5 A spin window device of a machine tool according to claim 2, wherein the control device comprises an air curtain driving unit that sprays high-pressure air through the air nozzle when the amount of infrared radiation detected by the infrared sensor is less than or equal to a predetermined first reference value, and a spin window driving unit that rotates the rotation motor of the spin window when the amount of infrared radiation detected by the infrared sensor is less than or equal to a predetermined second reference value. Claim 6 A spin window device of a machine tool according to claim 5, characterized in that the control device is set such that the first reference value is greater than the second reference value. Claim 7 A method for controlling a spin window of a machine tool, comprising: a spin window having a transparent glass surface on one side of the door of the machine tool for observing the interior; a detection sensor on one side of the spin window for detecting the presence of an operator in front; an infrared sensor on the outer side of the glass surface of the spin window for detecting the amount of cutting fluid adhering to the inner surface of the glass surface; and a control device that receives signals from the detection sensor and the infrared sensor and controls a spin window drive unit, wherein the method comprises: a worker detection step (S20) in which the presence of an operator is detected in front of the spin window through a detection sensor installed on the front of the door, and if it is detected that no operator is present in front of the spin window, the spin window is not operated and returns to a starting position, and if an operator is present in front of the spin window, the method proceeds to the next step; and an operator detection step in which infrared rays are emitted from a light-emitting part of an infrared sensor installed on the front of the spin window glass surface toward the inner surface of the spin window glass surface, and the amount of infrared rays received by a light-receiving part after the emitted infrared rays strike the glass surface and are reflected, thereby the spin window glass surface A spin window control method for a machine tool comprising: an infrared detection step (S30) for detecting the amount of cutting fluid adhered to a surface; a spin window driving step (S50) for driving a spin window driving unit that rotates the glass surface of the spin window by a rotary motor when the amount of infrared detected in the infrared detection step (S30) is less than or equal to a preset secondary reference value, and returning to a starting position when the amount of infrared detected is greater than the preset secondary reference value. Claim 8 In claim 7, the machine tool is further characterized by comprising: a plurality of air nozzles on one side of the main body of the machine tool that spray high-pressure air toward the front of the glass surface of the spin window to form an air curtain while simultaneously removing cutting fluid adhered to the glass surface of the spin window; a control device that receives signals from the detection sensor and the infrared sensor and controls the air curtain drive unit and the spin window drive unit; an air curtain drive unit that operates to form an air curtain on the front of the spin window by spraying high-pressure air through the air nozzles when the amount of infrared detected in the infrared detection step (S30) is less than or equal to a preset first reference value, and returns to the starting position without proceeding to the next step when the amount of infrared detected is greater than the preset first reference value; and the spin window drive step (S50) further comprises driving the air curtain drive unit when the amount of infrared detected in the infrared detection step (S30) is less than or equal to a preset second reference value. Spin Window Control Method Claim 9 A spin window control method for a machine tool according to claim 7, further comprising a spin window selection step (S10) which, prior to the operator detection step (S20), determines whether the operation of the selection switch is performed in the starting step, performs the operation of the next step if it is determined that the selection switch is turned on, and terminates without further executing the operation of the spin window if it is determined that the selection switch is turned off. Claim 10 A spin window control method for a machine tool, characterized in that, in claim 8, the first reference value is set to be greater than the second reference value. Claim 11 A method for controlling a spin window of a machine tool, comprising: a spin window having a transparent glass surface for observing the interior on one side of the door of the machine tool; a detection sensor on one side of the spin window for detecting the presence of an operator in front; an infrared sensor on the outer side of the glass surface of the spin window for detecting the amount of cutting fluid adhering to the inner surface of the glass surface; multiple air nozzles on one side of the main body of the machine tool for spraying high-pressure air toward the front of the glass surface of the spin window to form an air curtain and simultaneously remove cutting fluid adhering to the glass surface of the spin window; and a control device that receives signals from the detection sensor and the infrared sensor and controls an air curtain driving unit and a spin window driving unit, wherein the method comprises: a worker detection step (S20) in which the presence of an operator in front of the spin window is detected through a detection sensor installed on the front of the door, and if it is detected that no operator is present in front of the spin window, the spin window is not operated and the machine returns to a starting position, and if an operator is present in front of the spin window, the machine proceeds to the next step; spin window An infrared detection step (S30) for detecting the amount of cutting fluid adhered to the surface of the glass surface of the spin window by detecting the amount of infrared light received by a light receiving part after the emitted infrared light strikes the glass surface and is reflected by the light receiving part, and an infrared detection step (S50) for driving a spin window driving unit that rotates the glass surface of the spin window by a rotary motor when the amount of infrared light detected in the infrared detection step (S30) is less than or equal to a preset first reference value, and returning to the starting position without proceeding to the next step when the amount of infrared light detected is greater than the preset first reference value.A spin window control method for a machine tool comprising: an air curtain driving step (S40) wherein, when the amount of infrared radiation detected in the infrared detection step (S30) is less than or equal to a preset secondary reference value, an air curtain driving unit is operated to form an air curtain on the front surface of the spin window by spraying high-pressure air through an air nozzle in addition to the driving of the spin window driving unit, and when the amount of infrared radiation detected is greater than the preset secondary reference value, the unit returns to the starting position.

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