JP2001269838A - Cooling structure of control panel in machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling structure of a control panel in a machine tool capable of suppressing enlargement of the control panel and cost increase and improving cooling efficiency. SOLUTION: The cooling structure of the control panel in the machine tool includes heating elements such as a power supply 9 and an amplifier 11 stored and arranged in a substantially closed state and has an air vent hole 24. The cooling structure comprises a cooling air supply device 16 for supplying cooling air into the control panel 1, a temperature sensor (in-panel temperature detecting means) 17 for detecting temperature in a casing 2, and a PLC (in-panel temperature control means) 18 for supplying the cooling air into the control panel with the cooling air supply device 16 when the detected value of the temperature sensor 17 exceeds a set value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control panel for a machine tool in which a heating element such as an amplifier and a power supply is housed and arranged in a housing. To a cooling device for discharging air into the cooling device.

[0002]

2. Description of the Related Art For example, an NC machine tool is provided with a control panel for driving and controlling various drive motors, hydraulic pumps and the like. This type of control panel houses heating devices and components such as spindle amplifiers, power supply modules, transformers, and reactors. The heat generated from these components is radiated outside the panel, causing abnormal temperatures inside the panel. In some cases, a heat exchanger for suppressing the rise is provided.

In disposing such a heat exchanger in a panel, it is difficult to mount the heat exchanger inside a casing constituting a control panel due to the arrangement of heat-generating devices and heat-generating components or wiring. For this reason, conventionally, as shown in FIG.
It is common to attach the heat exchanger 32 to the door 31 of the housing 30 (see, for example, Japanese Patent Publication No. 2876583).

The heat exchanger 32 draws in cooling air outside the panel by the fan 33 outside the panel and discharges it from the lower end port 34 to the outside of the panel, and discharges air inside the panel sucked by the fan 35 in the panel from the upper end port 36. The cooling is performed via the heat radiation fins 37.

[0005]

However, in the case where the heat exchanger is mounted on the door as in the prior art, the depth of the door is increased by the size of the heat exchanger, resulting in an increase in the size of the control panel. There is.

Further, when the above-mentioned conventional heat exchanger is employed, it is expensive due to its structure, the cost increases, and the cooling efficiency is low because of the structure for indirectly cooling the air in the panel. There's a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and provides a cooling device for a control panel of a machine tool capable of suppressing an increase in size and cost of the control panel and improving cooling efficiency. It is an object.

[0008]

According to the present invention, a heating element such as an amplifier and a power supply is housed and arranged in a substantially hermetically sealed interior.
In a cooling device for a control panel of a machine tool having an air vent hole, a cooling air supply unit for supplying cooling air to the control panel, a panel temperature detecting unit for detecting a temperature in the control panel, and a temperature in the panel. A cooling-air supply unit configured to supply cooling air to the inside of the control panel when a detection value from the detection unit exceeds a set value;

[0009]

According to the cooling device for a control panel of a machine tool according to the present invention, when the temperature in the control panel exceeds a set value, external cooling air is supplied into the control panel. The heat generated from the heating element can be absorbed by the cooling air and discharged to the outside through the air vent hole. In this way, the cooling efficiency inside the panel can be increased, and the conventional heat exchanger can be eliminated. As a result, the size of the entire control panel can be reduced, and equipment costs can be reduced.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 are views for explaining a cooling device for a control panel of a machine tool according to an embodiment of the present invention. FIG. 1 is an overall perspective view of the control panel, and FIG. FIG. 3 is a schematic front view of a control panel provided.

In FIG. 1, reference numeral 1 denotes a control panel provided on the back of an NC machine tool (not shown), which controls the drive motors, hydraulic pumps and the like incorporated in the machine body. The control panel 1 includes a rectangular parallelepiped housing 2 including left and right plates 2a and 2b, a back plate 2c, a bottom plate 2d, and a top plate 2e, and a front door 3 that opens and closes a front opening of the housing 2. The opening is hermetically closed by the front door 3. Reference numeral 3a denotes a breaker handle which engages with the main breaker in the panel when the door is closed.
b is a door hinge.

As shown in FIG. 2, the inside of the housing 2 is divided into a control equipment storage section 6, a power supply storage section 7, and an amplifier storage section 8 in that order from the bottom by partition walls 4, 5. A control device (not shown) and control components such as switches, relays, and timers are housed in the unit 6. Heating elements such as a transformer 9 and a reactor 10 are accommodated and arranged in the power supply accommodating section 7, and a main breaker (not shown)
A contactor and the like are stored and arranged. Further, heating elements such as a spindle amplifier 11 and a power supply module 12 are stored in the amplifier storage section 8.

The control panel 1 includes an in-panel cooling device 15 which is a feature of the present embodiment. The in-panel cooling device 15 includes a cooling air supply device 16 serving as cooling air supply means for supplying external cooling air into the housing 2, a temperature sensor 17 for detecting a temperature in the housing 2, and an in-panel temperature. And a PLC 18 as control means.

The cooling air supply device 16 connects an air tube 20 to a cooling air storage tank 19 for storing cooling air compressed by a compression pump (not shown), and a cooling air outlet at a downstream end of the air tube 20. The air tube 20 is inserted through the right side plate 2 b of the housing 2 into the amplifier housing 8, and a solenoid valve 21 is provided near the storage tank 19 of the air tube 20.

The cooling air outlet 2 of the air tube 20
Reference numeral 0 a is disposed so as to be directed above the spindle amplifier 11 and the power supply module 12. The insertion portion of the right side plate 2 b of the air tube 20 is sealed by a cable gland 22.

An air vent hole 24 is formed in the left side plate 2a of the amplifier housing 8, and a filter 25 is provided in the air vent hole 24. The filter 25 has a function of allowing air to flow from the inside of the panel to the outside of the panel and preventing backflow from the outside of the panel to the inside of the panel, and is for ensuring sealing when power is cut off. This prevents air from being sucked into the panel due to a pressure change caused by a temperature difference between the inside and outside of the panel.

The temperature sensor 17 is arranged at an upper portion of the amplifier housing 8 where the temperature is relatively high, and is configured to output a detection signal of the temperature in the panel to the PLC 18.

The PLC 18 is mounted on the side plate 2b in the amplifier housing 8. When the detected value from the temperature sensor 17 exceeds a set value, the solenoid valve 21 is turned on.
Is configured to output an open signal to Also PLC
Reference numeral 18 outputs an open signal to the solenoid valve 21 and then outputs a close signal to the solenoid valve 21 after a lapse of a predetermined time, or outputs a close signal when the detection value from the temperature sensor 1 falls below a predetermined value. It is configured to be. Reference numerals 26 and 27 denote wirings, and the insertion portions of the side plates 2 b of the wirings 27 are sealed by a cable gland 28.

Next, the operation and effect of this embodiment will be described.

In the in-panel cooling device 15 of this embodiment, the solenoid valve 21 opens when the detected value from the temperature sensor 17 exceeds a set value. Then, the cooling air in the storage tank 19 is blown out into the amplifier housing section 8 through the air tube 20. The cooling air blown into the amplifier housing 8 absorbs the heat above the amplifier 11 while removing the air vent holes 24.
From the board. Further, the cooling air absorbs the heat in the power supply storage unit 7 through the partition wall 5.

The solenoid valve 21 is closed after a lapse of a predetermined time or when the temperature in the panel falls below a predetermined value. By repeating such an operation, the temperature inside the panel is maintained at a predetermined temperature or less, for example, at a temperature outside the panel +10 degrees or less.

As described above, according to the cooling device of the present embodiment, the air tube 20 for supplying the cooling air in the storage tank 19 into the amplifier housing portion 8 and the solenoid valve 21 interposed in the air tube 20 are provided. A cooling air supply device 16, a temperature sensor 17 for detecting a temperature in the amplifier housing 8, and a PLC 18 for opening the solenoid valve 21 when a detection value from the temperature sensor 17 exceeds a set value.
Therefore, the heat generated in the amplifier housing portion 8 can be absorbed by the cooling air and reliably discharged from the air vent hole 24. Thereby, the cooling efficiency inside the panel can be increased, and the conventional heat exchanger can be eliminated. As a result, the size of the housing 2 can be reduced, the entire control panel 1 can be reduced in size, and the equipment cost can be reduced. In particular, in the case of a machine tool, the control panel is set in a substantially closed state from the viewpoint of its use, so that heat is easily stored in the panel. Therefore, it is effective to adopt such a cooling structure.

In the above embodiment, the amplifier housing 8
In the present invention, the cooling air is supplied only to the power storage unit 7, for example, by connecting the air tube 20 to the power storage unit 7 via the bypass tube 20 '. It may be supplied, and in such a case, the cooling efficiency can be further increased.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a control panel of a machine tool according to an embodiment of the present invention.

FIG. 2 is a schematic front view of a cooling device provided in the control panel.

FIG. 3 is a schematic view of a control panel provided with a conventional heat exchanger.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Control panel 9 Transformer (heating element) 10 Reactor (heating element) 11 Spindle amplifier (heating element) 12 Power supply module (heating element) 15 In-panel cooling device 16 Cooling air supply device 17 Temperature sensor (in-panel temperature detecting means) 18 PLC (panel temperature control means) 24 Air vent hole

Claims (1)

[Claims] A cooling device for supplying cooling air to a control panel of a machine tool control panel cooling device having a heating element such as an amplifier and a power supply housed in a substantially hermetically sealed interior and having an air vent hole. Supply means, temperature detection means in the panel for detecting the temperature in the control panel, and cooling air supplied by the cooling air supply means when the detected value from the temperature detection means in the panel exceeds a set value. A control device for a machine tool control panel, comprising: a control device for controlling the temperature inside the control panel.