CN213235202U - Heat sink device - Google Patents
Heat sink device Download PDFInfo
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- CN213235202U CN213235202U CN202021817405.1U CN202021817405U CN213235202U CN 213235202 U CN213235202 U CN 213235202U CN 202021817405 U CN202021817405 U CN 202021817405U CN 213235202 U CN213235202 U CN 213235202U
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Abstract
The application provides a heat dissipation device. The heat dissipation device is applied to a power system of an excavator and comprises a heat dissipation assembly and a fan assembly, wherein the fan assembly and the heat dissipation assembly are arranged oppositely, the heat dissipation assembly comprises a first heat dissipation unit and a second heat dissipation unit, and the first heat dissipation unit and the second heat dissipation unit are respectively used for dissipating heat for different heating elements; the fan assembly comprises a control unit, a first fan and at least one second fan, the first fan is arranged facing the first heat dissipation unit and used for providing cooling air flow for the first heat dissipation unit, the second fan faces the second heat dissipation unit and used for providing cooling air flow for the second heat dissipation unit, and the rotating speeds of the first fan and the second fan are adjustable; the first fan and the second fan are both electrically connected with the control unit. The application provides a heat abstractor has reduced the oil consumption, has practiced thrift working cost.
Description
Technical Field
The application relates to the technical field of excavating equipment, in particular to a heat dissipation device.
Background
The large excavator is mainly used for mine operation, the working strength is high, the working environment is severe, and the working time is long, so that a cooling system of the excavator has severe requirements, and a cooling system of a common excavator is provided with a cooling fan to help a radiator to dissipate heat and cool.
In the prior art, because the heat dissipation capacity of a large excavator is large, the large excavator in the market all adopts a hydraulic oil independent heat dissipation mode, namely, a water radiator and a intercooler are connected in parallel to be cooled through an engine fan as a whole, an engine rotating shaft and the fan are rigidly connected, the rotating speed of the fan is consistent with that of the engine, the hydraulic oil is cooled by adopting an independent fan for heat dissipation, and the hydraulic oil fan drives a hydraulic motor to drive the fan to rotate through a hydraulic pump.
However, in the heat dissipation method in the prior art, the rotation speed of the fan cannot be adjusted, and when the ambient temperature and the water temperature are low, the fan still rotates at a high rotation speed, so that the oil consumption is increased.
Disclosure of Invention
The application provides a heat abstractor has reduced the radiating oil consumption of excavator cooling system, has practiced thrift the cost.
The application provides a heat dissipation device, which is applied to a power system of an excavator, and comprises a heat dissipation assembly and a fan assembly, wherein the fan assembly and the heat dissipation assembly are arranged oppositely;
the heat dissipation assembly comprises a first heat dissipation unit and a second heat dissipation unit, wherein the first heat dissipation unit and the second heat dissipation unit are respectively used for dissipating heat for different heating elements; the fan assembly comprises a control unit, a first fan and at least one second fan, the first fan is arranged facing the first heat dissipation unit and used for providing cooling air flow for the first heat dissipation unit, the second fan faces the second heat dissipation unit and used for providing cooling air flow for the second heat dissipation unit, and the rotating speeds of the first fan and the second fan are adjustable; the first fan and the second fan are electrically connected with the control unit, the control unit is used for detecting the temperature of partial structures in the first heat dissipation unit and the second heat dissipation unit and controlling the rotation states of the first fan and the second fan according to the detected temperature, so that the rotating speed of the fans is reduced when the temperature of the heating element is not high, on one hand, the starting of a power system can be accelerated, and on the other hand, the oil consumption can be reduced.
As an alternative, the present application provides a heat dissipation device, in which a first fan is disposed at a front end of an engine in a power system, and a driving shaft of the engine is connected to the first fan to drive the first fan to rotate.
As an alternative, the heat dissipation device provided by the present application, the control unit includes a controller, and the controller is electrically connected to the second fan to control the second fan to rotate.
As an optional mode, in the heat dissipation device provided by the present application, the first fan is an electromagnetic clutch fan, and the electromagnetic clutch fan is engaged with or disengaged from a driving shaft of the engine through an electromagnetic clutch.
As an optional mode, in the heat dissipation device provided by the present application, the first heat dissipation unit includes a water radiator and a intercooler, and the water radiator and the intercooler are arranged in parallel.
As an optional mode, in the heat dissipation device provided by the present application, the control unit further includes a first temperature sensor, the first temperature sensor is disposed on the water outlet pipe of the water radiator, and the first temperature sensor is electrically connected to the electromagnetic clutch, and is configured to control a clutch state of the electromagnetic clutch according to a temperature of liquid in the water outlet pipe.
As an optional mode, in the heat dissipation device provided by the present application, the number of the second fans is multiple, and the multiple second fans are arranged in an array.
As an optional mode, in the heat dissipation device provided by the present application, the plurality of second fans are arranged in the same plane, and each of the second fans has no overlapping area in the air outlet direction.
As an optional mode, in the heat dissipation device provided by the present application, the second heat dissipation unit is a hydraulic oil heat sink.
As an optional mode, in the heat dissipation device provided by the present application, the control unit further includes a second temperature sensor, the second temperature sensor is electrically connected to the controller, the second temperature sensor is disposed on an outer wall of the second heat dissipation unit to detect a temperature of the hydraulic oil radiator, and the controller is configured to control a rotation state of the second fan according to the temperature detected by the second temperature sensor.
The heat dissipation device is applied to a power system of an excavator and comprises a heat dissipation assembly and a fan assembly, wherein the fan assembly and the heat dissipation assembly are arranged oppositely, the heat dissipation assembly comprises a first heat dissipation unit and a second heat dissipation unit, and the first heat dissipation unit and the second heat dissipation unit are respectively used for dissipating heat for different heating elements; the fan assembly comprises a control unit, a first fan and at least one second fan, the first fan is arranged facing the first heat dissipation unit and used for providing cooling air flow for the first heat dissipation unit, the second fan faces the second heat dissipation unit and used for providing cooling air flow for the second heat dissipation unit, and the rotating speeds of the first fan and the second fan are adjustable; the first fan and the second fan are electrically connected with the control unit, the control unit is used for detecting the temperature of a part of the structure in the first heat dissipation unit and the second heat dissipation unit and controlling the rotation state of the first fan and the second fan according to the detected temperature, so that when the temperature of the heating element is not high, the rotation speed of the fan is reduced, on one hand, the starting of a power system can be accelerated, on the other hand, the oil consumption can be reduced, and the working cost is saved.
The construction of the present application and its advantages will be more apparent from the description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a heat dissipation device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a first fan according to an embodiment of the present disclosure;
fig. 3 is a distribution diagram of a second fan according to an embodiment of the present disclosure.
Description of reference numerals:
10-a heat dissipating component;
11-a first heat dissipation unit;
12-a second heat dissipation unit;
20-a fan assembly;
21-a first fan;
211-an electromagnetic clutch;
22-a second fan;
30-a control unit;
31-a controller;
32-a first temperature sensor;
33-a second temperature sensor;
40-engine.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments.
First, it should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present application, and are not intended to limit the scope of the present application. And can be adjusted as needed by those skilled in the art to suit particular applications.
Second, it should be noted that in the description of the present application, the terms of direction or positional relationship indicated by the terms "inside", "outside", and the like are based on the direction or positional relationship shown in the drawings, which are merely for convenience of description, and do not indicate or imply that a device or member must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
Furthermore, it should be noted that, in the description of the present application, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meaning of the above terms in the present application can be understood by those skilled in the art as the case may be.
In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The large excavator is mainly used for mine operation, the working strength is high, the working environment is severe, the working time is long, severe requirements are provided for a cooling system of the excavator, and the cooling system of a common excavator is provided with a cooling fan to help a radiator to dissipate heat and cool.
In the prior art, because the heat dissipation capacity of a large excavator is large, the large excavator in the market all adopts a hydraulic oil independent heat dissipation mode, namely, a water radiator and a intercooler are connected in parallel to be cooled through an engine fan as a whole, an engine rotating shaft and the fan are rigidly connected, the rotating speed of the fan is consistent with that of the engine, the hydraulic oil is cooled by adopting an independent fan for heat dissipation, and the hydraulic oil fan drives a hydraulic motor to drive the fan to rotate through a hydraulic pump.
However, the rotation speed of the fan cannot be adjusted, and when the ambient temperature and the water temperature are low, the fan still rotates at a high rotation speed, so that the oil consumption is increased.
In order to solve the above problem, an embodiment of the application provides a heat dissipation device, which reduces oil consumption of heat dissipation of an excavator cooling system and saves cost.
It should be noted that, in the embodiment of the present application, the heat dissipation device respectively performs auxiliary heat dissipation on different heat dissipation units, namely, the heat dissipation unit itself plays a role in dissipating heat from the power system, the heat dissipation device in this embodiment is to improve the heat dissipation effect of the heat dissipation unit, in the excavator, specifically, the radiator of the engine and the radiator of the hydraulic system are referred to, and although the different heat dissipation units are independent from each other, the different heat dissipation units are substantially directed to each unit in the power system, that is, the purpose of the different heat dissipation units is to improve the performance of the whole power system, and when the heat dissipation units in the power system are subjected to auxiliary heat dissipation in the embodiment, the radiating effect is controlled, and the radiating intensity is changed according to different working conditions, so that the oil consumption required by the radiating of the whole power system is reduced, and the operation cost of equipment is reduced.
Fig. 1 is a schematic structural diagram of a heat dissipation device according to an embodiment of the present disclosure; fig. 2 is a schematic structural diagram of a first fan according to an embodiment of the present disclosure; fig. 3 is a distribution diagram of a second fan according to an embodiment of the present disclosure. As shown in fig. 1 to fig. 3, the heat dissipation device provided in this embodiment is applied to a power system of an excavator, and the heat dissipation device includes a heat dissipation assembly 10 and a fan assembly 20, where the fan assembly 20 is disposed opposite to the heat dissipation assembly 10.
The heat dissipation assembly 10 includes a first heat dissipation unit 11 and a second heat dissipation unit 12, where the first heat dissipation unit 11 and the second heat dissipation unit 12 are respectively used for dissipating heat for different heating elements; the fan assembly 20 includes a control unit 30, a first fan 21 and at least one second fan 22, the first fan 21 is disposed facing the first heat dissipating unit 11 and is used for providing a cooling air flow to the first heat dissipating unit 11, the second fan 22 faces the second heat dissipating unit 12 and is used for providing a cooling air flow to the second heat dissipating unit 12, and the rotation speeds of the first fan 21 and the second fan 22 are both adjustable; the first fan 21 and the second fan 22 are electrically connected to the control unit 30, the control unit 30 is configured to detect temperatures of partial structures in the first heat dissipation unit 11 and the second heat dissipation unit 12, and control rotation states of the first fan 21 and the second fan 22 according to the detected temperatures, so that when a temperature of a heating element is not high, a rotation speed of the fans is reduced, on one hand, starting of the power system can be accelerated, on the other hand, oil consumption can be reduced, and when the temperature of the heating element is high, full-speed operation of the fans is controlled, and a heat dissipation effect is improved.
Specifically, the first heat dissipating unit 11 has a fluid therein for dissipating heat, the first fan 21 is disposed at a side of the first heat dissipating unit 11, and correspondingly, the second heat dissipating unit 12 is disposed at a side of the second heat dissipating unit 12.
In addition, the direct distances between the first fan 21 and the second fan 22 and the first heat dissipating unit 11 and the second heat dissipating unit 12 may be adjusted according to the actual installation gap of the device, and are not particularly limited in this embodiment.
As an alternative, in the heat dissipation device provided in the embodiment of the present application, the first fan 21 is disposed at a front end of the engine 40 in the power system, and a driving shaft of the engine 40 is connected to the first fan 21 to drive the first fan 21 to rotate.
Specifically, the engine 40 serves as a power source of the power system, and a drive shaft thereof is used for outputting power, and besides being provided with an output end, the front end of which also extends out of the body of the engine 40 and is connected with the first fan 21, so as to drive the first fan 21 to rotate, and when the engine 40 works, the corresponding heat dissipation system of the engine 40, namely, the first heat dissipating unit 11 also starts dissipating heat, the first fan 21 driven by the motor 40 to rotate is opposite to the first heat dissipating unit 11, the first heat dissipating unit 11 can be assisted to dissipate heat, and in the present embodiment, the rotation speed of the first fan 21 is adjustable, when the temperature of the first heat dissipation unit 11 is low, the first heat dissipation unit can rotate at a low speed, so that the engine 40 can be quickly heated and started to enter a high-efficiency working state, and after the temperature of the first heat radiating unit 11 is increased, the first fan 21 may be rotated at a higher speed to increase the heat radiating effect.
As an alternative manner, in the heat dissipation device provided in the embodiment of the present application, the control unit 30 includes a controller 31, and the controller 31 is electrically connected to the second fan 22 to control the second fan 22 to rotate.
Specifically, the second fan 22 is disposed at a position opposite to the second heat dissipating unit 12, and the controller 31 controls the rotation speed of the second fan 22 to be adjustable, that is, when the temperature of the second heat dissipating unit 12 is low, the controller 31 controls the second fan 22 to rotate at a low speed, and when the temperature of the second heat dissipating unit 12 is high, the controller 31 controls the second fan 22 to rotate at a high speed, so as to improve the heat dissipating effect.
For example, the second fan 22 is an electronic fan, and the control of the electronic fan by the controller 31 can achieve stepless speed change, so that the rotation speed control of the second fan 22 is more accurate, that is, the rotation speed of the second fan 22 is continuously changed as the temperature in the second radiator 12 slowly increases.
As an alternative manner, in the heat dissipation device provided in the embodiment of the present application, the first fan 21 is an electromagnetic clutch fan, and the electromagnetic clutch fan is engaged with or disengaged from the driving shaft of the engine 40 through an electromagnetic clutch 211.
Specifically, one end of the electromagnetic clutch 211 is connected to a driving shaft at the front end of the engine 40, and the other end of the electromagnetic clutch 211 is connected to a rotating shaft of the first fan 21, the electromagnetic clutch 211 can realize multi-stage speed change of the first fan 21, different temperatures of the first heat dissipation unit 11 correspond to different rotating speeds, when the engine 40 is just started, the first fan 21 can idle under inertia, power consumption of the engine 40 is reduced, and the rotating speed of the first fan 21 is correspondingly adjusted through the electromagnetic clutch 211 along with the increase of the temperature of the first heat dissipation unit 11.
As an alternative manner, in the heat dissipation device provided in the embodiments of the present application, the first heat dissipation unit 11 includes a water radiator and a intercooler, and the water radiator and the intercooler are arranged in parallel.
Specifically, the water radiator and the intercooler may be arranged in a parallel structure without an overlapping portion, and the heat is radiated by the first fan 21 as an integral structure, that is, the fan surface of the first fan 21 faces the side walls of the water radiator and the intercooler while covering the side walls of the water radiator and the intercooler.
As an optional mode, in the heat dissipation apparatus provided in this embodiment of the present application, the control unit 30 further includes a first temperature sensor 32, the first temperature sensor 32 is disposed on the water outlet pipe of the water radiator and the intercooler, and the first temperature sensor 32 is electrically connected to the electromagnetic clutch 211, and is configured to control a clutch state of the electromagnetic clutch 211 according to a temperature of liquid in the water outlet pipe.
Specifically, the first temperature sensor 32 can control the state of the electromagnetic clutch according to different preset temperature thresholds, and the first temperature sensor 32 can monitor the outlet water temperature of the water radiator and the intercooler in real time and adjust the rotating speed of the first fan 21 according to the real-time state, so that the power consumption can be reduced to the maximum extent.
It should be noted that, in this embodiment, the arrangement of the water radiator and the intercooler may be a combined whole, or may be an integrated single component, and only the first fan 21 may be used to realize heat dissipation of the water radiator and the intercooler, and this embodiment does not specifically limit the specific structure and arrangement of the water radiator and the intercooler, and the working modes and configurations of the water radiator and the intercooler are the prior art, and are not described herein again.
As an optional manner, in the heat dissipation device provided in the embodiment of the present application, the number of the second fans 22 is multiple, and the multiple second fans 22 are arranged in an array.
Specifically, the plurality of second fans 22 are arranged in the same plane, and each second fan 22 has no overlapping area in the air outlet direction, so that the second fans 22 can fully cover the surface of the second heat dissipation unit 12, and the heat dissipation effect is improved.
In addition, each second fan 22 can work independently, that is, each second fan is electrically connected to the controller 31, so that heat dissipation can be controlled independently at different positions of the second heat dissipation unit 12, and thus, on one hand, the heat dissipation effect of the local high-temperature area of the second heat dissipation unit 12 can be improved, and on the other hand, the rotating speed of the second fan 22 can be reduced in the area with lower temperature, thereby reducing energy consumption.
For example, the second heat dissipation unit 22 is a hydraulic oil heat sink, that is, the second fan 22 can adjust the rotation speed according to the temperature of the hydraulic oil to dissipate heat.
As an alternative manner, in the heat dissipation device provided in the embodiment of the present application, the control unit 30 further includes a second temperature sensor 33, the second temperature sensor 33 is electrically connected to the controller 31, the second temperature sensor 33 is disposed on an outer wall of the second heat dissipation unit 12 to detect a temperature of the hydraulic oil radiator, and the controller 31 is configured to control a rotation state of the second fan 22 according to the temperature detected by the second temperature sensor 33.
Specifically, the second temperature sensor 33 may detect the temperature of the hydraulic oil, so that the rotational speed of the second fan 22 is controlled by the controller 31 to increase the rotational speed of the second fan 22 as the temperature of the hydraulic oil increases.
It should be noted that, in the present embodiment, the number of the second fans 22 can be adjusted according to the volume, structure and installation position of the hydraulic radiator, and only a plurality of the second fans 22 need to cover the second heat dissipation unit 12, i.e. the surface of the hydraulic radiator.
The heat dissipation device is applied to a power system of an excavator and comprises a heat dissipation assembly and a fan assembly, wherein the fan assembly and the heat dissipation assembly are arranged oppositely, the heat dissipation assembly comprises a first heat dissipation unit and a second heat dissipation unit, and the first heat dissipation unit and the second heat dissipation unit are respectively used for dissipating heat for different heating elements; the fan assembly comprises a control unit, a first fan and at least one second fan, the first fan is arranged facing the first heat dissipation unit and used for providing cooling air flow for the first heat dissipation unit, the second fan faces the second heat dissipation unit and used for providing cooling air flow for the second heat dissipation unit, and the rotating speeds of the first fan and the second fan are adjustable; the first fan and the second fan are electrically connected with the control unit, the control unit is used for detecting the temperature of a part of the structure in the first heat dissipation unit and the second heat dissipation unit and controlling the rotation state of the first fan and the second fan according to the detected temperature, so that when the temperature of the heating element is not high, the rotation speed of the fan is reduced, on one hand, the starting of a power system can be accelerated, on the other hand, the oil consumption can be reduced, and the working cost is saved.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A heat dissipation device is applied to a power system of an excavator and is characterized by comprising a heat dissipation assembly and a fan assembly, wherein the fan assembly and the heat dissipation assembly are arranged oppositely;
the heat dissipation assembly comprises a first heat dissipation unit and a second heat dissipation unit, and the first heat dissipation unit and the second heat dissipation unit are respectively used for dissipating heat for different heating elements; the fan assembly comprises a control unit, a first fan and at least one second fan, the first fan is arranged facing the first heat dissipation unit and used for providing cooling air flow for the first heat dissipation unit, the second fan faces the second heat dissipation unit and used for providing cooling air flow for the second heat dissipation unit, and the rotating speeds of the first fan and the second fan are both adjustable; the first fan and the second fan are electrically connected with the control unit, and the control unit is used for detecting the temperature of partial structures in the first heat dissipation unit and the second heat dissipation unit and controlling the rotation states of the first fan and the second fan according to the detected temperature.
2. The heat dissipating device of claim 1, wherein the first fan is disposed at a front end of an engine in the power system, and a driving shaft of the engine is connected to the first fan to drive the first fan to rotate.
3. The heat dissipating device of claim 2, wherein the control unit comprises a controller electrically connected to the second fan to control the second fan to rotate.
4. The heat dissipating device as claimed in claim 3, wherein the first fan is an electromagnetic clutch fan, and the electromagnetic clutch fan is engaged with or disengaged from a driving shaft of the engine through an electromagnetic clutch.
5. The heat dissipating device of claim 4, wherein the first heat dissipating unit comprises a water radiator and an intercooler, and the water radiator and the intercooler are arranged in parallel.
6. The heat dissipation device of claim 5, wherein the control unit further comprises a first temperature sensor disposed on the water outlet pipe of the water radiator, and the first temperature sensor is electrically connected to the electromagnetic clutch for controlling the clutch state of the electromagnetic clutch according to the temperature of the liquid in the water outlet pipe.
7. The heat dissipating device as claimed in any one of claims 1 to 6, wherein the second fan is plural and the plural second fans are arranged in an array.
8. The heat dissipating device of claim 7, wherein the second fans are arranged in a same plane, and each of the second fans has no overlapping area in the air outlet direction.
9. The heat dissipating device of any one of claims 3 to 6, wherein the second heat dissipating unit is a hydraulic oil radiator.
10. The heat dissipating device of claim 9, wherein the control unit further comprises a second temperature sensor electrically connected to the controller, the second temperature sensor is disposed on an outer wall of the second heat dissipating unit to detect the temperature of the hydraulic oil radiator, and the controller is configured to control the rotation state of the second fan according to the temperature detected by the second temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021817405.1U CN213235202U (en) | 2020-08-26 | 2020-08-26 | Heat sink device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021817405.1U CN213235202U (en) | 2020-08-26 | 2020-08-26 | Heat sink device |
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| CN213235202U true CN213235202U (en) | 2021-05-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115729332A (en) * | 2022-11-14 | 2023-03-03 | 超聚变数字技术有限公司 | Electronic equipment cooling method and device and electronic equipment |
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2020
- 2020-08-26 CN CN202021817405.1U patent/CN213235202U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115729332A (en) * | 2022-11-14 | 2023-03-03 | 超聚变数字技术有限公司 | Electronic equipment cooling method and device and electronic equipment |
| CN115729332B (en) * | 2022-11-14 | 2023-11-03 | 超聚变数字技术有限公司 | Cooling method and device of electronic equipment and electronic equipment |
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