CN214237004U - Integrated multi-core PTC heater radiating fin assembly tool - Google Patents
Integrated multi-core PTC heater radiating fin assembly tool Download PDFInfo
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- CN214237004U CN214237004U CN201922463492.9U CN201922463492U CN214237004U CN 214237004 U CN214237004 U CN 214237004U CN 201922463492 U CN201922463492 U CN 201922463492U CN 214237004 U CN214237004 U CN 214237004U
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Abstract
The invention relates to an integrated multi-core PTC heater radiating fin assembling tool, wherein a horizontal cylinder drives a movable flat plate to move along a guide plate, the movable flat plate is matched with a fixed clamping plate on a lower fixed partition plate and simultaneously clamps a plurality of core tubes of a multi-core PTC heater, a positioning plate on a middle fixed partition plate is matched with the middle part of the positioning core tube through a limiting groove, a vertical cylinder telescopic rod penetrates through the upper fixed partition plate and then drives the guide partition plate to drive a pressing plate to push radiating fins to simultaneously move downwards to the upper part of the positioning plate along the plurality of core tubes, after the radiating fins are fully filled in the upper half section of the core tube, the horizontal cylinder is loosened, the core tube is taken out, the radiating fins are continuously installed in the other half section of the core tube after being overturned, the whole radiating fins are installed and then are transferred to a base assembling process, the radiating fin assembling work of a set of multi-core PTC heater can be completed through one-time operation, the structure is simple and compact, the process is simplified, the operation is convenient, and the efficiency is high.
Description
Technical Field
The invention relates to an integrated multi-core PTC heater radiating fin assembling tool.
Background
The PTC heater is widely applied to air conditioners, hot air curtain machines, dehumidifiers, dryers, clothes dryers, fan heaters, bath heaters, automobiles and other equipment needing warm air supply due to the fact that the PTC heater does not have the phenomenon of reddening on the surface of an electric heating tube heater under any application condition because the PTC heater has the characteristics of small thermal resistance, high heat exchange efficiency, good safety performance, automatic constant temperature, electricity saving and the like, generally adopts PTC ceramic heating elements and aluminum tubes to form the PTC heater, a plurality of radiating fins are arranged outside the aluminum tubes to improve the radiating rate, the PTC heater is generally provided with a plurality of cores, and a plurality of radiating fins are respectively arranged on each core.
Disclosure of Invention
The invention aims to solve the technical problem of providing an integrated multi-core PTC heater radiating fin assembling tool which can simultaneously install radiating fins outside a plurality of heater core aluminum tubes, and has the advantages of simple and compact structure, convenience in operation and high efficiency.
The invention discloses an integrated multi-core PTC heater radiating fin assembling tool which is characterized in that: the device comprises a left supporting upright and a right supporting upright which are fixedly supported on the ground along the vertical direction, wherein a lower fixing partition plate is arranged at the lower part between the two supporting uprights, an upper fixing partition plate and a guide partition plate are arranged at the upper part, two ends of the lower fixing partition plate and two ends of the upper fixing partition plate are fixedly arranged on the supporting uprights, and two ends of the guide partition plate are arranged on the supporting uprights at two sides through sliding fit and can move up and down along the vertical supporting uprights; a fixed clamping plate is fixedly arranged above the lower fixed partition plate, a movable clamping plate is matched at the front side of the fixed clamping plate, and the movable clamping plate can be matched with the fixed clamping plate to be parallel to limit and clamp a plurality of core tubes of the multi-core PTC heater; a pressing plate is fixedly arranged below the guide partition plate, a plurality of guide grooves which penetrate through the upper part and the lower part are arranged at the front section of the pressing plate corresponding to the positions of the core tubes, each guide groove can be sleeved on each core tube in a matched mode and can slide up and down along each core tube, and the support upright posts form guide posts; the width of the guide groove is larger than the width of the core pipe and smaller than the maximum width of a flanging boss of the radiating fin of the multi-core PTC heater; a vertical cylinder is fixedly arranged above the upper fixed partition plate along the vertical direction, and after a telescopic rod of the vertical cylinder penetrates through the upper fixed partition plate, the lower end of the telescopic rod of the vertical cylinder is fixedly connected to the guide partition plate;
the front side edge of the fixed splint extends out of the outer side of the lower fixed clapboard and is provided with a plurality of concave slots, a plurality of inserting blocks are arranged at the positions of the edge of the movable splint corresponding to the slots, the outer side surface at one side of each inserting block and the corresponding inner side surface of each slot form clamping surfaces at two transverse sides of the core tube, and each inserting block can be inserted into the corresponding slot to be matched with and clamp the core tube;
the inner side surface of one side of the slot is a core pipe inner clamping surface, the inner side surface of the other side of the slot is a guide inner inclined surface, the outer side surface of one side of the insertion block is a core pipe outer clamping surface correspondingly, and the outer side surface of the other side of the insertion block is a guide outer inclined surface;
the longitudinal depth of the slot is consistent with the width of the core tube, and the position of the rear side surface of the movable clamping plate between the adjacent insertion blocks is matched with the inner bottom surface of the slot to form limiting surfaces at two longitudinal sides of the core tube;
the lower section of the slot is provided with a limiting boss, and the middle part of the limiting boss is provided with a positioning groove for inserting the core tube electrode;
the front side of the lower fixed partition board is fixedly connected with a guide plate, a horizontal cylinder is fixedly arranged above the guide plate, and the rear end of a telescopic rod of the horizontal cylinder is fixedly connected to the front side surface of the movable clamping plate, so that the horizontal cylinder can drive the movable clamping plate to move back and forth along the guide plate;
the middle part of the supporting upright post is provided with a middle fixed clapboard, two ends of the middle fixed clapboard are fixedly arranged on the supporting upright post, a positioning plate is fixedly arranged above the middle fixed clapboard, the front side edge of the positioning plate extends out of the outer side of the middle fixed clapboard, and is provided with limiting grooves, the number and the positions of which correspond to the slots on the fixed splint, and the limiting grooves can limit the supporting core tube through clearance fit;
the guide groove of the front section of the pressure plate is also positioned on a part of the entity extending out of the guide partition plate from the front edge of the pressure plate, and a part of the lower surface of the pressure plate, which is positioned between adjacent guide grooves, is provided with an upward concave process groove;
the outer sides of the left supporting upright post and the right supporting upright post are respectively provided with a vertical support, and the inner sides of the upper sections of the supports are respectively provided with an infrared safety protection grating.
The invention discloses an assembly tool and an assembly method for an integrated multi-core PTC heater radiating fin, which are characterized in that: the method comprises the following steps:
firstly, inserting six core tubes into positioning grooves in a fixed clamp plate through electrode plates at the lower ends, inserting the middle parts of the six core tubes into the positioning grooves on a guide plate in a matched manner, starting a horizontal cylinder to drive a movable clamp plate to move along the horizontal direction, and inserting an inserting block into an inserting groove to clamp the core tubes in a matched manner;
secondly, two cooling fins are respectively positioned and placed at the upper ends of the six core pipes;
thirdly, starting the vertical cylinder, driving the guide partition plate to move downwards, driving the pressing plate to move downwards along the core pipe through the guide groove, pushing the two cooling fins to move downwards to the guide plate along the six core pipes simultaneously, and driving the guide partition plate and the pressing plate to reset;
fourthly, repeating the second step and the third step until the upper half section of the core pipe is completely matched with the radiating fins, stopping the vertical cylinder, loosening the horizontal cylinder, taking out the core pipe and turning over;
and fifthly, repeating the second step, the third step and the fourth step, taking out the core tube, and then transferring to the next base assembling procedure.
The invention relates to an integrated multi-core PTC heater radiating fin assembling tool, wherein a horizontal cylinder drives a movable flat plate to move along a guide plate, the movable flat plate is matched with a fixed clamping plate on a lower fixed partition plate and simultaneously clamps a plurality of core tubes of a multi-core PTC heater, a positioning plate on a middle fixed partition plate is matched with the middle part of the positioning core tube through a limiting groove, a vertical cylinder telescopic rod penetrates through the upper fixed partition plate and then drives the guide partition plate to drive a pressing plate to push radiating fins to simultaneously move downwards to the upper part of the positioning plate along the plurality of core tubes, after the radiating fins are fully filled in the upper half section of the core tube, the horizontal cylinder is loosened, the core tube is taken out, the radiating fins are continuously installed in the other half section of the core tube after being overturned, the whole radiating fins are installed and then are transferred to a base assembling process, the radiating fin assembling work of two sets of multi-core PTC heaters can be completed through one-time operation, the structure is simple and compact, the process is simplified, the operation is convenient, and the efficiency is high.
Drawings
FIG. 1 is a schematic plane structure diagram of an integrated multicore PTC heater heat sink assembly fixture according to an embodiment of the present invention;
FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1;
FIG. 3 is a schematic view of the structure B-B of FIG. 1;
FIG. 4 is a schematic view of the C-C configuration of FIG. 1;
FIG. 5 is a schematic structural view of the integrated multicore PTC heater heat sink assembly tool after a horizontal cylinder and a movable clamp plate are removed;
FIG. 6 is an enlarged schematic view of a core tube planar structure suitable for the integrated multicore PTC heater heat sink assembly fixture in accordance with the embodiment of the present invention;
FIG. 7 is an enlarged schematic view of a heat sink plane structure suitable for the integrated multi-core PTC heater heat sink assembly tool in the embodiment of the invention;
FIG. 8 is a schematic diagram of a rear plan view of a positioning and core tube mounting fixture for an integral multi-core PTC heater heat sink assembly according to an embodiment of the invention;
FIG. 9 is a schematic plane structure diagram of an integrated multicore PTC heater cooling fin assembly fixture according to an embodiment of the present invention, which is positioned and provided with a core tube, and then clamped by a movable clamping plate driven by a horizontal cylinder;
FIG. 10 is a schematic cross-sectional view of FIG. 9;
FIG. 11 is a schematic plan view of the integrated multi-core PTC heater with the heat sink positioning tool and the core tube, the heat sink being placed on the top of the core tube;
FIG. 12 is a schematic plane structure diagram of the integrated multicore PTC heater cooling fin assembly fixture of the embodiment of the present invention, in which the guide partition plate drives the pressing plate to push the cooling fin to the middle of the core tube;
FIG. 13 is a schematic plan view of a continuous assembly of heat sinks by the integrated multi-core PTC heater heat sink assembly fixture according to the embodiment of the invention;
FIG. 14 is a schematic cross-sectional view taken along line B-B of a fin assembly tool of an integral multiple core PTC heater according to an embodiment of the invention after the fin assembly tool has assembled fins on a core tube;
fig. 15 is a schematic view of the plane structure of the core tube after the cooling fin is assembled by the cooling fin assembly tool for the integrated multicore PTC heater according to the embodiment of the present invention.
Detailed Description
As shown in the figure, the main structure of the integrated multi-core PTC heater radiating fin assembly tool adopts a conventional structure similar to a small punch, the overall plan scheme is that a left supporting upright column and a right supporting upright column 4 which are fixedly supported on the ground are arranged on the ground of a workshop of a production workshop along the vertical direction, a transverse lower fixed baffle plate 14 is arranged at the lower part of a space between two supporting upright posts 4, a transverse fixed baffle plate 3 and a guide baffle plate 5 are arranged at the upper part of the space, two ends of the upper fixed baffle plate 3 are directly and fixedly arranged at the upper ends of the two supporting upright posts 4 through a pressure plate 31, the lower parts of two ends of the lower fixed baffle plate 14 are fixedly supported and arranged on the supporting upright posts at two sides through fixed supporting blocks 15 respectively, the lower parts of two ends of the guide baffle plate 5 are matched and slidably arranged on the supporting upright posts 4 at two sides through guide sleeves 6 respectively, and two ends of the guide baffle plate move up and down along the vertical supporting upright posts through the guide sleeves;
a fixed clamp plate 17 is fixedly arranged above the lower fixed partition plate 14, a movable clamp plate 12 is arranged on the front side of the fixed clamp plate 17 in a matched mode, and a plurality of core tubes 20 of the multi-core PTC heater are clamped in a limiting mode in parallel through the movable clamp plate 12 and the fixed clamp plate 17 in a matched mode; a pressing plate 2 is fixedly installed below the guide partition plate 5, a plurality of guide grooves which penetrate up and down are formed in the front section of the pressing plate 2 corresponding to the positions of the core tubes 20, the pressing plate 2 is sleeved on each core tube 20 through the cooperation of each guide groove and slides downwards along each core tube 20 to press the radiating fins 21 and push and assemble the radiating fins onto the core tubes, and the support upright posts 4 form a guide post structure; the width of the guide groove is larger than the width of the core tube 20 and smaller than the maximum width of the flanging boss of the radiating fin of the multi-core PTC heater, so that the pressing plate can smoothly press the radiating fin; a vertical cylinder 1 is fixedly installed above the upper fixed partition plate 3 along the vertical direction, and after a telescopic rod of the vertical cylinder 1 penetrates through the upper fixed partition plate 3, the lower end of the vertical cylinder is fixedly connected onto the guide partition plate 5, and the vertical cylinder provides up-and-down sliding power for the guide partition plate.
Specifically, the front side edge of the fixed clamp plate 17 extends to the outer side of the lower fixed partition plate 14 and is provided with a plurality of concave slots 171, a plurality of insertion blocks 121 are arranged at the edge of the movable clamp plate 12 corresponding to the slots 171, one side outer side surface of each insertion block 121 and the corresponding inner side surface of the corresponding slot 171 form two transverse side limiting clamping surfaces of the core tube 20, and each insertion block 121 is inserted into the corresponding slot 171 to clamp the core tube 20 in a matching manner;
a horizontal guide plate 13 is fixedly connected to the front side of the lower fixed partition plate 14, a horizontal cylinder 10 is fixedly mounted above the guide plate 13, the rear end of a telescopic rod of the horizontal cylinder 10 is fixedly connected to the front side surface of the movable clamping plate 12, and the horizontal cylinder provides power to drive the movable clamping plate 12 to horizontally move along the guide plate 13 to be matched with the fixed clamping plate to clamp the core pipe or withdraw from and loosen the core pipe;
further, the inner side surface of one side of the slot 171 is an inner clamping surface of the core tube 20, the inner side surface of the other side is a guiding inner inclined surface, the outer side surface of one corresponding side of the insert block 121 is an outer clamping surface of the core tube 20, and the outer side surface of the other side is a guiding outer inclined surface; when the movable clamping plate is driven by the horizontal cylinder to be inserted into the slot through the matching of the inserting block, the inserting block is inserted along the matching of the guiding inner inclined plane of the slot through the guiding outer inclined plane, so that the inserting block has the trend of transversely clamping the core tube when being inserted longitudinally, and the movable clamping plate is simple in structure, stable, reliable and convenient to operate.
The longitudinal depth of the slot 171 is consistent with the width of the core tube 20, and the part of the rear side surface of the movable clamping plate 12, which is positioned between the adjacent insertion blocks 121, is matched with the inner bottom surface of the slot 171 to form limiting surfaces at two longitudinal sides of the core tube 20; the side surfaces around the core tube are provided with limiting clamping surfaces, so that the clamping and positioning reliability is further improved.
And the lower section of the slot 171 is provided with a limit boss 172, the middle part of the limit boss 172 is provided with a positioning groove, when the core tube is positioned and clamped, the core tube is firstly inserted into the positioning groove through an electrode plate, and then the horizontal cylinder provides power to drive the movable clamping plate 12 to horizontally move along the guide plate 13 to be matched with the fixed clamping plate to clamp the core tube, so that the core tube is positioned and clamped conveniently.
Furthermore, a middle fixed clapboard 8 is arranged in the middle of the supporting upright, two ends of the middle fixed clapboard 8 are fixedly supported and installed on the supporting upright 4 at two sides through fixed supporting blocks 9, a positioning plate 7 is fixedly arranged above the middle fixed clapboard 8, the front side edge of the positioning plate 7 also extends out of the outer side of the middle fixed clapboard 8, and limiting grooves with the number and the positions corresponding to the slots 171 on the fixed splint 17 are arranged, and the limiting grooves are in clearance fit with the limiting supporting core pipes; after the lower end of the core tube is inserted into the positioning groove through the electrode plate, the middle part of the core tube is inserted into the limiting groove in a matched mode, the clamping balance performance is improved, meanwhile, the upper surface of the positioning plate 7 can serve as a cooling fin assembling positioning surface of the upper section of the core tube, when the first cooling fin is assembled in a sliding mode from top to bottom along the core tube, the first cooling fin slides to the upper surface of the positioning plate 7, positioning is stopped, and the structure is simple and compact.
The guide groove of the front section of the pressure plate 2 is also arranged on a part of the entity extending out of the guide partition plate 3 from the front side edge of the pressure plate 2, and an upward concave process groove is arranged on the part of the lower surface of the pressure plate 2 between the adjacent guide grooves, so that the weight is reduced, and the energy is saved;
furthermore, the outer sides of the left and right supporting columns 4 are respectively provided with a vertical bracket 19, and the inner sides of the upper sections of the brackets 19 are respectively provided with an infrared safety protection grating 18, so that the device is safe and reliable.
Connect a vertical support post 16 below the mounting panel, set up a transition connecting block 11 on the movable clamp plate leading flank, horizontal cylinder telescopic link rear end fixed connection 11 on the transition connecting block, mechanical support is stable.
The invention discloses an assembly tool and an assembly method for an integrated multi-core PTC heater radiating fin, which are characterized in that: the method comprises the following steps:
firstly, inserting six core tubes into positioning grooves in a fixed clamp plate through electrode plates at the lower ends, inserting the middle parts of the six core tubes into the positioning grooves on a guide plate in a matched manner, starting a horizontal cylinder to drive a movable clamp plate to move along the horizontal direction, and inserting an inserting block into an inserting groove to clamp the core tubes in a matched manner;
secondly, two cooling fins are respectively positioned and placed at the upper ends of the six core pipes;
thirdly, starting the vertical cylinder, driving the guide partition plate to move downwards, driving the pressing plate to move downwards along the core pipe through the guide groove, pushing the two cooling fins to move downwards to the guide plate along the six core pipes simultaneously, and driving the guide partition plate and the pressing plate to reset;
fourthly, repeating the second step and the third step until the upper half section of the core pipe is completely matched with the radiating fins, stopping the vertical cylinder, loosening the horizontal cylinder, taking out the core pipe and turning over;
and fifthly, repeating the second step, the third step and the fourth step, taking out the core tube, and then transferring to the next base assembling procedure.
The invention relates to an assembly tool and an assembly method for an integrated multi-core PTC heater radiating fin, wherein a horizontal cylinder drives a movable flat plate to move along a guide plate, the movable flat plate is matched with a fixed clamping plate on a lower fixed partition plate and simultaneously clamps a plurality of core tubes of the multi-core PTC heater, a positioning plate on a middle fixed partition plate is matched with the middle part of the positioning core tube through a limiting groove, a vertical cylinder telescopic rod penetrates through the upper fixed partition plate and then drives the guide partition plate to drive a pressing plate to push radiating fins to simultaneously move downwards to the upper part of the positioning plate along the plurality of core tubes, after the radiating fins are fully filled in the upper half section of the core tube, the horizontal cylinder is loosened, the core tubes are taken out and turned over, then the radiating fins are continuously installed in the other half section of the core tube, and after all the radiating fins are installed, the sequence is changed to a base assembly process.
Claims (9)
1. The utility model provides an integral type multicore body PTC heater fin assembly fixture which characterized in that: the device comprises a left supporting upright and a right supporting upright which are fixedly supported on the ground along the vertical direction, wherein a lower fixing partition plate is arranged at the lower part between the two supporting uprights, an upper fixing partition plate and a guide partition plate are arranged at the upper part, two ends of the lower fixing partition plate and two ends of the upper fixing partition plate are fixedly arranged on the supporting uprights, and two ends of the guide partition plate are arranged on the supporting uprights at two sides through sliding fit and can move up and down along the vertical supporting uprights; a fixed clamping plate is fixedly arranged above the lower fixed partition plate, a movable clamping plate is matched at the front side of the fixed clamping plate, and the movable clamping plate can be matched with the fixed clamping plate to be parallel to limit and clamp a plurality of core tubes of the multi-core PTC heater; a pressing plate is fixedly arranged below the guide partition plate, a plurality of guide grooves which penetrate through the upper part and the lower part are arranged at the front section of the pressing plate corresponding to the positions of the core tubes, each guide groove can be sleeved on each core tube in a matched mode and can slide up and down along each core tube, and the support upright posts form guide posts; the width of the guide groove is larger than the width of the core pipe and smaller than the maximum width of a flanging boss of the radiating fin of the multi-core PTC heater; a vertical cylinder is fixedly mounted above the upper fixed partition plate along the vertical direction, and after a telescopic rod of the vertical cylinder penetrates through the upper fixed partition plate, the lower end of the telescopic rod is fixedly connected onto the guide partition plate.
2. The assembly tooling for cooling fins of an integrated multicore PTC heater according to claim 1, wherein: the fixed splint front side edge stretches out to the fixed baffle outside down to be provided with a plurality of sunken slots, the movable splint edge is provided with a plurality of inserted blocks with the corresponding position of slot, the lateral surface of one side of inserted block and the corresponding medial surface of slot constitute the horizontal both sides clamping face of core pipe, every inserted block can insert corresponding slot interior cooperation and press from both sides tight core pipe.
3. The assembly tooling for cooling fins of an integrated multicore PTC heater according to claim 2, wherein: the inner side surface of one side of the slot is a core pipe inner clamping surface, the inner side surface of the other side of the slot is a guide inner inclined surface, the outer side surface of one side of the insertion block is a core pipe outer clamping surface correspondingly, and the outer side surface of the other side of the insertion block is a guide outer inclined surface correspondingly.
4. The assembly tooling for cooling fins of an integrated multicore PTC heater according to claim 3, wherein: the longitudinal depth of the slot is consistent with the width of the core tube, and the position of the rear side surface of the movable clamping plate between the adjacent insertion blocks is matched with the inner bottom surface of the slot to form limiting surfaces at two longitudinal sides of the core tube.
5. The integrated multicore PTC heater fin assembly tool according to claim 4, wherein: the slot hypomere is provided with spacing boss, and spacing boss middle part is provided with the constant head tank that can supply core pipe electrode to insert.
6. An integrated multicore PTC heater fin assembly fixture according to any of claims 1 to 5, wherein: the lower fixed baffle plate is fixedly connected with a guide plate on the front side, a horizontal cylinder is fixedly mounted above the guide plate, and the rear end of a telescopic rod of the horizontal cylinder is fixedly connected to the front side face of the movable clamping plate, so that the horizontal cylinder can drive the movable clamping plate to move back and forth along the guide plate.
7. The integrated multicore PTC heater fin assembly tool of claim 6, wherein: the supporting column is provided with a middle fixing partition plate in the middle, two ends of the middle fixing partition plate are fixedly mounted on the supporting column, a positioning plate is fixedly arranged above the middle fixing partition plate, the front side edge of the positioning plate extends out of the outer side of the middle fixing partition plate and is provided with limiting grooves corresponding to the slots in quantity and position on the fixing clamp plate, and the limiting grooves can be matched with limiting supporting core pipes in a clearance fit mode.
8. The integrated multicore body PTC heater fin assembly fixture of claim 7, wherein: the guide groove of the front section of the pressure plate is also positioned at the part of the front edge of the pressure plate extending out of the outer side of the guide partition plate, and the part of the lower surface of the pressure plate positioned between the adjacent guide grooves is provided with an upward sunken technological groove.
9. The integrated multicore body PTC heater fin assembly fixture of claim 8, wherein: the outer sides of the left supporting upright post and the right supporting upright post are respectively provided with a vertical support, and the inner sides of the upper sections of the supports are respectively provided with an infrared safety protection grating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922463492.9U CN214237004U (en) | 2019-12-31 | 2019-12-31 | Integrated multi-core PTC heater radiating fin assembly tool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922463492.9U CN214237004U (en) | 2019-12-31 | 2019-12-31 | Integrated multi-core PTC heater radiating fin assembly tool |
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| CN214237004U true CN214237004U (en) | 2021-09-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111203701A (en) * | 2019-12-31 | 2020-05-29 | 江苏众众电热科技有限公司 | Integrated multi-core PTC heater radiating fin assembly tool and assembly method |
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2019
- 2019-12-31 CN CN201922463492.9U patent/CN214237004U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111203701A (en) * | 2019-12-31 | 2020-05-29 | 江苏众众电热科技有限公司 | Integrated multi-core PTC heater radiating fin assembly tool and assembly method |
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