CN221913135U - Cooling mechanism for production of charging pile shell - Google Patents
Cooling mechanism for production of charging pile shell Download PDFInfo
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- CN221913135U CN221913135U CN202420494455.2U CN202420494455U CN221913135U CN 221913135 U CN221913135 U CN 221913135U CN 202420494455 U CN202420494455 U CN 202420494455U CN 221913135 U CN221913135 U CN 221913135U
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- 238000001816 cooling Methods 0.000 title claims abstract description 39
- 230000007246 mechanism Effects 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title abstract description 12
- 238000009423 ventilation Methods 0.000 claims abstract description 11
- 230000009467 reduction Effects 0.000 claims description 19
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 241000886569 Cyprogenia stegaria Species 0.000 abstract 3
- 238000007664 blowing Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 101001121408 Homo sapiens L-amino-acid oxidase Proteins 0.000 description 1
- 102100026388 L-amino-acid oxidase Human genes 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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Abstract
Description
技术领域Technical Field
本实用新型涉及充电桩壳体生产设备技术领域，具体为一种充电桩壳体生产用冷却机构。The utility model relates to the technical field of charging pile shell production equipment, in particular to a cooling mechanism for charging pile shell production.
背景技术Background Art
随着新能源电动汽车的普及，充电桩的需求不断增加，充电桩的壳体大多由塑料材质制成，在充电桩壳体的生产过程中，通过注塑模具注塑生产，注塑模具内部的温度很高，导致刚出模的壳体的温度较高，需要对其进行冷却，传统的冷却方式通常采用自然冷却，这种方法冷却时间较长，效率低下，影响了生产进度，后面通过使用冷却机构对其进行冷却，提高了效率。With the popularity of new energy electric vehicles, the demand for charging piles continues to increase. The shells of charging piles are mostly made of plastic. In the production process of the charging pile shells, they are produced by injection molding. The temperature inside the injection mold is very high, resulting in a high temperature for the shell just out of the mold. It needs to be cooled. The traditional cooling method usually adopts natural cooling. This method has a long cooling time and low efficiency, which affects the production progress. Later, it is cooled by using a cooling mechanism to improve efficiency.
现有技术公开号CN215750589U专利文献提供了一种充电桩壳体生产用冷却机构，将壳体放在安装槽内，启动气缸驱动升降板向下运动，待散热风扇移动靠近壳体时，启动散热风扇，散热风扇对壳体进行散热，相对于传统的自然冷却的方式，散热效果好，冷却时间短，提高了生产的效率。The prior art patent document with publication number CN215750589U provides a cooling mechanism for the production of charging pile shells. The shell is placed in the installation groove, and the cylinder is started to drive the lifting plate to move downward. When the cooling fan moves close to the shell, the cooling fan is started. The cooling fan dissipates heat from the shell. Compared with the traditional natural cooling method, the cooling effect is good, the cooling time is short, and the production efficiency is improved.
上述的现有技术，虽然通过启动散热风扇，可以吹风对壳体进行散热冷却，但是在对充电桩壳体的冷却过程中，散热风扇对壳体的顶部进行吹风散热冷却，而壳体的侧面受到的风较少，冷却的不均匀，冷却的效率较低，不能满足人们的需要，因此，我们需要一种充电桩壳体生产用冷却机构。Although the above-mentioned prior art can blow air to dissipate heat and cool the shell by starting the cooling fan, during the cooling process of the charging pile shell, the cooling fan blows air to the top of the shell to dissipate heat and cool it, while the sides of the shell receive less wind, resulting in uneven cooling and low cooling efficiency, which cannot meet people's needs. Therefore, we need a cooling mechanism for the production of charging pile shells.
实用新型内容Utility Model Content
本实用新型的目的在于提供一种充电桩壳体生产用冷却机构，以解决上述背景技术中提出的问题。The purpose of the utility model is to provide a cooling mechanism for producing a charging pile shell to solve the problems raised in the above-mentioned background technology.
为了解决上述技术问题，本实用新型提供如下技术方案：一种充电桩壳体生产用冷却机构，包括固定底座，所述固定底座的顶部设置有风机组件，且固定底座的外壁设置有转动组件；In order to solve the above technical problems, the utility model provides the following technical solutions: A cooling mechanism for producing a charging pile housing, comprising a fixed base, a fan assembly is arranged on the top of the fixed base, and a rotating assembly is arranged on the outer wall of the fixed base;
所述风机组件包括风机外壳，且风机外壳的内壁安装有固定风机，所述风机外壳的外壁可拆卸连接有过滤网，且过滤网的外壁设置有固定螺栓，所述风机外壳的内壁固定连接有通风网；The fan assembly includes a fan housing, and a fixed fan is installed on the inner wall of the fan housing, a filter screen is detachably connected to the outer wall of the fan housing, and a fixing bolt is arranged on the outer wall of the filter screen, and a ventilation net is fixedly connected to the inner wall of the fan housing;
所述转动组件包括减速电机，且减速电机的输出轴通过联轴器固定连接有转动杆，所述转动杆的外壁设置有固定轴承，且转动杆的一端固定连接有转动盘，所述转动盘的底部固定连接有转动块，所述固定底座的顶部开设有转动槽，所述转动盘的顶部开设有放置槽。The rotating assembly includes a reduction motor, and the output shaft of the reduction motor is fixedly connected to a rotating rod through a coupling, the outer wall of the rotating rod is provided with a fixed bearing, and one end of the rotating rod is fixedly connected to a rotating disk, the bottom of the rotating disk is fixedly connected to a rotating block, the top of the fixed base is provided with a rotating groove, and the top of the rotating disk is provided with a placement groove.
优选的，所述固定底座的顶部固定连接有支撑架，且支撑架的外壁开设有通风槽，所述支撑架的外壁安装有电动伸缩杆，且电动伸缩杆的一端固定连接有安装架。Preferably, a support frame is fixedly connected to the top of the fixed base, and a ventilation slot is provided on the outer wall of the support frame. An electric telescopic rod is installed on the outer wall of the support frame, and one end of the electric telescopic rod is fixedly connected to the mounting frame.
优选的，所述风机外壳的内壁形状大小与固定风机的外壁形状大小相互匹配，且风机外壳的内壁与固定风机的外壁相贴合。Preferably, the shape and size of the inner wall of the fan housing matches the shape and size of the outer wall of the fixed fan, and the inner wall of the fan housing fits the outer wall of the fixed fan.
优选的，所述风机外壳通过固定螺栓与过滤网构成固定结构，且固定螺栓的一端螺纹穿过过滤网伸入到风机外壳内进行连接。Preferably, the fan housing and the filter screen form a fixing structure through fixing bolts, and one end of the fixing bolt is threaded through the filter screen and extends into the fan housing for connection.
优选的，所述固定底座通过减速电机与转动杆构成转动结构，且减速电机的一端伸入到固定底座内与转动杆进行连接。Preferably, the fixed base forms a rotating structure through a reduction motor and a rotating rod, and one end of the reduction motor extends into the fixed base and is connected to the rotating rod.
优选的，所述转动杆的形状大小与固定轴承的形状大小相互匹配，且转动杆的一端贯穿固定轴承。Preferably, the shape and size of the rotating rod match those of the fixed bearing, and one end of the rotating rod passes through the fixed bearing.
优选的，所述固定底座通过转动槽与转动块构成转动结构，且转动块的一端伸入到转动槽内进行连接。Preferably, the fixed base forms a rotating structure with the rotating block through the rotating groove, and one end of the rotating block extends into the rotating groove for connection.
与现有技术相比，本实用新型所达到的有益效果是：Compared with the prior art, the beneficial effects achieved by the utility model are:
第一、本实用新型设置有风机外壳、固定风机、过滤网、固定螺栓和通风网，在工件的顶部和侧面设置有风机组件，通过启动固定风机吹风，可以对工件的顶部和侧面吹风，对其进行散热冷却，可以更快地将热量从工件表面带走，缩短冷却时间，提高了冷却的效率，满足了人们的需要。First, the utility model is provided with a fan housing, a fixed fan, a filter, fixing bolts and a ventilation net. Fan components are provided on the top and sides of the workpiece. By starting the fixed fan to blow air, air can be blown on the top and sides of the workpiece to dissipate heat and cool it. Heat can be taken away from the surface of the workpiece more quickly, the cooling time is shortened, the cooling efficiency is improved, and people's needs are met.
第二、本实用新型设置有减速电机、转动杆、固定轴承、转动盘、转动块、转动槽和放置槽，当固定风机吹风对工件散热时，通过启动减速电机，使转动盘转动带动工件缓慢转动，使工件的顶部和侧面都能受到风吹，都能得到有效的冷却，冷却的更加均匀，结构简单便于使用。Second, the utility model is provided with a reduction motor, a rotating rod, a fixed bearing, a rotating disk, a rotating block, a rotating groove and a placement groove. When the fixed fan blows air to dissipate the heat of the workpiece, the reduction motor is started to rotate the rotating disk to drive the workpiece to rotate slowly, so that the top and sides of the workpiece can be blown by the wind and can be effectively cooled. The cooling is more uniform, the structure is simple and easy to use.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1为本实用新型主视结构示意图；FIG1 is a schematic diagram of the main structure of the utility model;
图2为本实用新型固定底座与风机外壳结构示意图；Figure 2 is a schematic diagram of the structure of the fixed base and the fan housing of the utility model;
图3为本实用新型风机外壳与固定风机结构示意图；Figure 3 is a schematic diagram of the fan housing and the fixed fan structure of the utility model;
图4为本实用新型图2中A处放大结构示意图。FIG. 4 is an enlarged structural schematic diagram of point A in FIG. 2 of the present invention.
其中：1、固定底座；2、风机组件；201、风机外壳；202、固定风机；203、过滤网；204、固定螺栓；205、通风网；3、转动组件；301、减速电机；302、转动杆；303、固定轴承；304、转动盘；305、转动块；306、转动槽；307、放置槽；4、支撑架；5、通风槽；6、电动伸缩杆；7、安装架。Among them: 1. Fixed base; 2. Fan assembly; 201. Fan casing; 202. Fixed fan; 203. Filter; 204. Fixing bolt; 205. Ventilation net; 3. Rotating assembly; 301. Reducer motor; 302. Rotating rod; 303. Fixed bearing; 304. Rotating disk; 305. Rotating block; 306. Rotating slot; 307. Placement slot; 4. Support frame; 5. Ventilation slot; 6. Electric telescopic rod; 7. Mounting frame.
具体实施方式DETAILED DESCRIPTION
下面将结合本实用新型实施例中的附图，对本实用新型实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本实用新型一部分实施例，而不是全部的实施例。基于本实用新型中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本实用新型保护的范围。The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
请参阅图1、图2、图3和图4，一种充电桩壳体生产用冷却机构，包括固定底座1，固定底座1的顶部设置有风机组件2，且固定底座1的外壁设置有转动组件3，风机组件2包括风机外壳201，且风机外壳201的内壁安装有固定风机202，风机外壳201的外壁可拆卸连接有过滤网203，且过滤网203的外壁设置有固定螺栓204，风机外壳201的内壁固定连接有通风网205，转动组件3包括减速电机301，且减速电机301的输出轴通过联轴器固定连接有转动杆302，转动杆302的外壁设置有固定轴承303，且转动杆302的一端固定连接有转动盘304，转动盘304的底部固定连接有转动块305，固定底座1的顶部开设有转动槽306，转动盘304的顶部开设有放置槽307。Please refer to Figures 1, 2, 3 and 4, a cooling mechanism for the production of charging pile shells, including a fixed base 1, a fan assembly 2 is arranged on the top of the fixed base 1, and a rotating assembly 3 is arranged on the outer wall of the fixed base 1, the fan assembly 2 includes a fan housing 201, and a fixed fan 202 is installed on the inner wall of the fan housing 201, the outer wall of the fan housing 201 is detachably connected with a filter screen 203, and the outer wall of the filter screen 203 is provided with a fixing bolt 204, the inner wall of the fan housing 201 is fixedly connected with a ventilation net 205, the rotating assembly 3 includes a reduction motor 301, and the output shaft of the reduction motor 301 is fixedly connected with a rotating rod 302 through a coupling, the outer wall of the rotating rod 302 is provided with a fixed bearing 303, and one end of the rotating rod 302 is fixedly connected with a rotating disk 304, the bottom of the rotating disk 304 is fixedly connected with a rotating block 305, a rotating groove 306 is opened at the top of the fixed base 1, and a placement groove 307 is opened at the top of the rotating disk 304.
通过上述技术方案，在工件的顶部和侧面设置有风机组件2，通过启动固定风机202吹风，可以对工件的顶部和侧面吹风，对其进行散热冷却，可以更快地将热量从工件表面带走，缩短冷却时间，提高了冷却的效率，满足了人们的需要，当固定风机202吹风对工件散热时，通过启动减速电机301，使转动盘304转动带动工件缓慢转动，使工件的顶部和侧面都能受到风吹，都能得到有效的冷却，冷却的更加均匀，结构简单便于使用。Through the above technical scheme, a fan assembly 2 is provided on the top and side of the workpiece. By starting the fixed fan 202 to blow air, air can be blown to the top and side of the workpiece to dissipate heat and cool it. Heat can be taken away from the surface of the workpiece more quickly, the cooling time is shortened, the cooling efficiency is improved, and people's needs are met. When the fixed fan 202 blows air to dissipate heat to the workpiece, the reduction motor 301 is started to rotate the rotating disk 304 to drive the workpiece to rotate slowly, so that the top and side of the workpiece can be blown by the wind, can be effectively cooled, and the cooling is more uniform. The structure is simple and easy to use.
具体的，固定底座1的顶部固定连接有支撑架4，且支撑架4的外壁开设有通风槽5，支撑架4的外壁安装有电动伸缩杆6，且电动伸缩杆6的一端固定连接有安装架7。Specifically, a support frame 4 is fixedly connected to the top of the fixed base 1, and a ventilation slot 5 is opened on the outer wall of the support frame 4. An electric telescopic rod 6 is installed on the outer wall of the support frame 4, and one end of the electric telescopic rod 6 is fixedly connected to a mounting frame 7.
通过上述技术方案，安装架7的内壁安装有风机组件2，通过启动电动伸缩杆6，可以实现安装架7的上下移动，可以根据工件的大小进行调节间距。Through the above technical solution, the fan assembly 2 is installed on the inner wall of the mounting frame 7. By starting the electric telescopic rod 6, the mounting frame 7 can be moved up and down, and the spacing can be adjusted according to the size of the workpiece.
具体的，风机外壳201的内壁形状大小与固定风机202的外壁形状大小相互匹配，且风机外壳201的内壁与固定风机202的外壁相贴合。Specifically, the shape and size of the inner wall of the fan housing 201 matches the shape and size of the outer wall of the fixed fan 202 , and the inner wall of the fan housing 201 fits the outer wall of the fixed fan 202 .
通过上述技术方案，加强了风机外壳201与固定风机202之间的连接效果，使固定风机202可以很好的安装在风机外壳201内。Through the above technical solution, the connection effect between the fan housing 201 and the fixed fan 202 is strengthened, so that the fixed fan 202 can be well installed in the fan housing 201.
具体的，风机外壳201通过固定螺栓204与过滤网203构成固定结构，且固定螺栓204的一端螺纹穿过过滤网203伸入到风机外壳201内进行连接。Specifically, the fan housing 201 and the filter screen 203 form a fixed structure through a fixing bolt 204, and one end of the fixing bolt 204 is threadedly passed through the filter screen 203 and extends into the fan housing 201 for connection.
通过上述技术方案，加强了风机外壳201与固定螺栓204和过滤网203之间的连接效果，固定螺栓204的数量为多个，可以很好的将过滤网203固定在风机外壳201上，便于对过滤网203的安装和拆卸，通风网205的设置，可以避免操作人员手伸入到风机外壳201内，被工作的固定风机202伤到，减少安全隐患。Through the above technical scheme, the connection effect between the fan housing 201 and the fixing bolts 204 and the filter 203 is strengthened. There are multiple fixing bolts 204, which can well fix the filter 203 on the fan housing 201, making it easy to install and remove the filter 203. The setting of the ventilation net 205 can prevent the operator from reaching his hands into the fan housing 201 and being injured by the working fixed fan 202, thereby reducing safety hazards.
具体的，固定底座1通过减速电机301与转动杆302构成转动结构，且减速电机301的一端伸入到固定底座1内与转动杆302进行连接。Specifically, the fixed base 1 forms a rotating structure through the reduction motor 301 and the rotating rod 302 , and one end of the reduction motor 301 extends into the fixed base 1 and is connected to the rotating rod 302 .
通过上述技术方案，加强了固定底座1与减速电机301和转动杆302之间的连接效果，使减速电机301在启动后，可以很好的带动转动杆302转动，减速电机301是电机与齿轮箱的集合体，主要传动结构由传动电机、齿轮箱组装而成的减速机，具备连接、传动、减速、提升扭矩等功能。Through the above technical scheme, the connection effect between the fixed base 1 and the reduction motor 301 and the rotating rod 302 is strengthened, so that the reduction motor 301 can well drive the rotating rod 302 to rotate after starting. The reduction motor 301 is a combination of a motor and a gear box. The main transmission structure is a reducer assembled from a transmission motor and a gear box, which has the functions of connection, transmission, deceleration, and torque enhancement.
具体的，转动杆302的形状大小与固定轴承303的形状大小相互匹配，且转动杆302的一端贯穿固定轴承303。Specifically, the shape and size of the rotating rod 302 match those of the fixed bearing 303 , and one end of the rotating rod 302 passes through the fixed bearing 303 .
通过上述技术方案，加强了转动杆302与固定轴承303之间的连接效果，使转动杆302在转动时，依靠固定轴承303转动的更加稳定。Through the above technical solution, the connection effect between the rotating rod 302 and the fixed bearing 303 is strengthened, so that the rotating rod 302 can rotate more stably by relying on the fixed bearing 303 when rotating.
具体的，固定底座1通过转动槽306与转动块305构成转动结构，且转动块305的一端伸入到转动槽306内进行连接。Specifically, the fixed base 1 forms a rotating structure with the rotating block 305 through the rotating groove 306, and one end of the rotating block 305 extends into the rotating groove 306 for connection.
通过上述技术方案，使转动盘304在转动时，依靠转动块305在转动槽306内转动的更加稳定，放置槽307的形状大小根据工件的形状进行设计的，使充电桩的壳体可以很好的放在放置槽307内。Through the above technical solution, when the rotating disk 304 rotates, it relies on the rotating block 305 to rotate more stably in the rotating groove 306. The shape and size of the placement groove 307 are designed according to the shape of the workpiece, so that the shell of the charging pile can be well placed in the placement groove 307.
在使用时，首先为本装置连接外接电源，外接电源为本装置进行供电，将工件放在放置槽307上，启动减速电机301，带动转动杆302转动，转动杆302带动转动盘304转动，转动盘304带动转动块305在转动槽306内转动的更加稳定，转动盘304转动带动工件缓慢转动，通过启动固定风机202，固定风机202抽取外界的空气，外界的空气经过过滤网203，过滤网203对空气中的灰尘进行阻挡，固定风机202吹风到工件的顶部和侧面，对其进行散热冷却，使工件的顶部和侧面都能受到风吹，都能得到有效的冷却，冷却的更加均匀，结构简单便于使用，这就完成了全部工作，本说明书中未作详细描述的内容属于本领域专业技术人员公知的现有技术。When in use, first connect the device to an external power source, the external power source supplies power to the device, place the workpiece on the placement slot 307, start the reduction motor 301, drive the rotating rod 302 to rotate, the rotating rod 302 drives the rotating disk 304 to rotate, the rotating disk 304 drives the rotating block 305 to rotate more stably in the rotating slot 306, the rotation of the rotating disk 304 drives the workpiece to rotate slowly, and by starting the fixed fan 202, the fixed fan 202 draws outside air, the outside air passes through the filter 203, the filter 203 blocks the dust in the air, and the fixed fan 202 blows air to the top and sides of the workpiece to dissipate heat and cool it, so that the top and sides of the workpiece can be blown by the wind, can be effectively cooled, and the cooling is more uniform. The structure is simple and easy to use, which completes all the work. The content not described in detail in this manual belongs to the existing technology known to professional and technical personnel in this field.
尽管已经示出和描述了本实用新型的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本实用新型的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型的范围由所附权利要求及其等同物限定。Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the invention is defined by the appended claims and their equivalents.
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