CN111336856A - Heat exchanger and machining method thereof - Google Patents
Heat exchanger and machining method thereof Download PDFInfo
- Publication number
- CN111336856A CN111336856A CN201811551039.7A CN201811551039A CN111336856A CN 111336856 A CN111336856 A CN 111336856A CN 201811551039 A CN201811551039 A CN 201811551039A CN 111336856 A CN111336856 A CN 111336856A
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- reinforcing plate
- flanging
- plate
- hole
- heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
- F28F9/262—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators for radiators
- F28F9/268—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators for radiators by permanent joints, e.g. by welding
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2275/00—Fastening; Joining
- F28F2275/06—Fastening; Joining by welding
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a heat exchanger, which comprises a plate sheet and a connecting pipe, and further comprises a first reinforcing plate and a second reinforcing plate, wherein the plate sheet is provided with a mounting hole, the first reinforcing plate is overlapped on the plate sheet, the second reinforcing plate is overlapped on the first reinforcing plate, the first reinforcing plate is provided with a first flanging part, a first flanging hole is formed in the first flanging part, a second flanging hole is formed in the second reinforcing plate, a second flanging hole is formed in the second flanging part, the flanging direction of the first flanging part is opposite to the flanging direction of the second flanging part, one end of the connecting pipe extends into the first flanging hole and the second flanging hole and is welded and fixed with the corresponding hole walls of the first flanging hole and the second flanging hole; the first reinforcing plate is welded and fixed with the plate, and the first reinforcing plate is welded and fixed with the second reinforcing plate. The connecting pipe of the heat exchanger has higher welding strength and welding reliability.
Description
Technical Field
The invention relates to the technical field of heat exchange, in particular to a heat exchanger and a processing method thereof.
Background
Heat exchangers generally comprise a connection piece, which is typically fixed to a top plate or a bottom plate by means of brazing. Referring to fig. 1 to 3, fig. 1 is an exploded view of a pipe welding structure of a general heat exchanger; FIG. 2 is a sectional view of a welded structure of a connection pipe of the heat exchanger shown in FIG. 1; fig. 3 is a partially enlarged view of the portion I in fig. 2.
As shown in the figure, a flanging hole 2' corresponding to the connecting pipe 1' is punched on the heat exchanger 3', two pier heads are processed on the connecting pipe 1', wherein the pier head positioned below is used for limiting the depth of the connecting pipe 1' inserted into the mounting hole of the cold water plate 3', the riveting section of the connecting pipe 1' is inserted into the flanging hole 2' to complete riveting, and then the connecting pipe 1' is fixed by using an inner composite layer 4' of the heat exchanger 3'.
Disclosure of Invention
The invention aims to provide a heat exchanger with improved welding and fixing of connecting pipes and plates.
The invention also aims to provide a processing method of the heat exchanger.
In order to achieve the above object, the present invention provides a heat exchanger, which comprises a plate and a connecting pipe, and further comprises a first reinforcing plate and a second reinforcing plate, the plate is provided with a mounting hole, the first reinforcing plate is superposed on the plate, the second reinforcing plate is superposed on the first reinforcing plate, the first reinforcing plate is provided with a first flanging part, a first flanging hole is formed on the first flanging part, the first flanging part extends into the mounting hole, the second reinforcing plate is provided with a second flanging part, a second flanging hole is formed on the second flanging part, the first flanging hole corresponds to the second flanging hole, the flanging direction of the first flanging part is opposite to that of the second flanging part, and one end of the connecting pipe extends into the first flanging hole and the second flanging hole and is welded and fixed with the corresponding hole walls of the first flanging hole and the second flanging hole; the first reinforcing plate is welded and fixed with the plate, and the first reinforcing plate is welded and fixed with the second reinforcing plate.
The heat exchanger that this technical scheme provided has increased first reinforcing plate and second reinforcing plate on the slab, and the link of takeover stretches into the first flanging hole of first reinforcing plate and the second flanging hole of second reinforcing plate, and the takeover is great with the welding area of first flanging portion and second flanging portion, and the welding length of takeover is longer, can bear great radial force to no matter be radial pulling force or thrust, because the turn-ups opposite direction of two flanging portions, can improve the intensity of turn-ups part.
Drawings
Fig. 1 is an exploded view illustrating a pipe connection welding structure of a general heat exchanger;
FIG. 2 is a sectional view of a welded structure of a connection pipe of the heat exchanger shown in FIG. 1;
FIG. 3 is a partial enlarged view of the portion I in FIG. 2
FIG. 4 is a schematic structural diagram of a heat exchanger according to an embodiment of the present invention;
FIG. 5 is a sectional view of a connection pipe welding structure of the heat exchanger shown in FIG. 4;
fig. 6 is a partially enlarged view of a portion II in fig. 5.
In fig. 1 to 3:
1', connecting pipe 2', flanging hole 3', heat exchanger 4', internal composite layer 5', flanging bending part 6' welding section
In fig. 4 to 6:
1. water-cooling plate sheet (schematic) 2, mounting hole 3, connecting pipe 4, first reinforcing plate 5, second reinforcing plate 6, first flanging hole 7, second flanging hole 8, positioning hole 9, first protrusion 10, second protrusion 11, limiting part 12, external composite layer 13, internal composite layer 14, internal composite layer 15, first circular groove 16, second circular groove 16
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings.
In this specification, terms such as "upper, lower, inner, and outer" are established based on positional relationships shown in the drawings, and the corresponding directions and positional relationships may vary depending on the product orientation shown in the drawings, and therefore, the terms should not be interpreted as an absolute limitation of the scope of protection.
Referring to fig. 4 and 5, fig. 4 is a schematic structural diagram of a heat exchanger according to an embodiment of the present invention; fig. 5 is a sectional view of a connection pipe welding structure of the heat exchanger shown in fig. 4.
As shown in the figure, the takeover welded structure that this embodiment provided for the takeover welded structure of electric automobile battery water-cooling board, and it takes over the base member and is water-cooling board sheet 1, and water-cooling board sheet 1 can also be the bottom plate for the roof, and water-cooling board sheet 1 is flat rectangle roughly, is formed with the cavity that can hold coolant between two adjacent sheets, and mounting hole 2 has been seted up to water-cooling board sheet 1, and takeover 3 is connected with mounting hole 2 of water-cooling board sheet 1.
Different from the existing connecting pipe welding structure, the mounting hole 2 is not provided with a flanging structure, and is further provided with a first reinforcing plate 4 and a second reinforcing plate 5, the first reinforcing plate 4 and the second reinforcing plate 5 can be rectangular, four right-angle parts are rounded, the first reinforcing plate 4 is superposed on the water cooling plate sheet 1, and a first flanging hole 6 which can be embedded into the mounting hole 2 is arranged on the first reinforcing plate; the second reinforcing plate 5 is superposed on the first reinforcing plate 4, and is also provided with a second flanging hole 7 with the flanging direction opposite to that of the first flanging hole 6; the connecting end of the connecting pipe 3 extends into the first flanging hole 6 and the second flanging hole 7 and is welded and fixed with the hole walls of the first flanging hole 6 and the second flanging hole 7; the first reinforcing plate 4 is welded and fixed with the water-cooling plate sheet 1, and the first reinforcing plate 4 is welded and fixed with the second reinforcing plate 5.
The shape of the first reinforcing plate 4 and the second reinforcing plate 5 is not limited to a rectangle, but may be other shapes such as a circle, an ellipse, or a polygon according to the difference of the nozzle base body or in other aspects.
A first positioning mechanism may be further disposed between the first reinforcing plate 4 and the water-cooling plate sheet 1, a second positioning mechanism is disposed between the second reinforcing plate 5 and the first reinforcing plate 4, in this embodiment, two sets of first positioning mechanisms and second positioning mechanisms are disposed together, one set of the first positioning mechanism and the second positioning mechanism is located on the left side of the connection pipe 3, the other set of the first positioning mechanism and the second positioning mechanism is located on the right side of the connection pipe 2, and the two sets of the first positioning mechanism and the second positioning mechanism are mirror-symmetrical with the connection pipe 3 as a center. Through setting up positioning mechanism and being favorable to the installation location on the one hand, on the other hand also can improve fixed strength, and also can avoid the interference that causes by turn-ups fillet.
In this embodiment, a positioning hole 8 is punched on the first reinforcing plate 4, a first convex portion 9 corresponding to the positioning hole 8 is arranged on the upper surface of the water-cooling plate sheet 1, the first convex portion 9 is in a shape of a cylinder with a short size and can be made by adopting a punching process, and a first circular groove 15 formed after punching is formed on the inner top surface of the water-cooling plate sheet 1. The first reinforcing plate 4 is matched and positioned with the first convex part 9 of the water-cooling plate sheet 1 through the positioning hole 8 thereof to form a first positioning mechanism. And, the first circular groove 15 can also play a role of turbulence.
The lower surface of the second reinforcing plate 5 is provided with a second convex part 10 corresponding to the upper end of the positioning hole 8, the second convex part 10 is also in a shape of a cylinder with a short size and is manufactured by adopting a stamping process, a second circular groove 16 formed after stamping is reserved on the upper surface of the second reinforcing plate 5, and the second reinforcing plate 5 is positioned by matching the second convex part 10 of the second reinforcing plate with the positioning hole 8 of the first reinforcing plate 4 to form a second positioning mechanism. The first protrusion 9 and the second protrusion 10 both extend into the positioning hole 8, and a small gap is maintained between the first protrusion 9 and the second protrusion 10, and the distance between the end surface of the first protrusion and the end surface of the second protrusion is: 0.05 mm-0.4 mm. Thus, while interference between first projection 9 and second projection 10 is prevented, the distance between first projection 9 and second projection 10 is maintained at 0.05mm to 0.4mm, and first projection 9 and second projection 10 are fixed by melting the composite layer.
By adopting the positioning mode of matching the convex part and the positioning hole, the interference caused by the flanging process fillet can be avoided, and the verticality of the connecting pipe is improved.
It will be appreciated that the first and second positioning mechanisms described above are preferred and that various variations are possible.
For example, the first reinforcing plate 4 is not provided with the positioning holes 8, but is provided with a first concave portion and a second concave portion on the upper surface and the lower surface, respectively; for another example, the first concave portion and the second concave portion of the first reinforcing plate 4 are offset from each other; for another example, the first convex part 9 on the water-cooling plate sheet 1 and the first concave part on the first reinforcing plate 4 exchange positions, and the second convex part 10 on the second reinforcing plate 5 and the second concave part on the first reinforcing plate exchange positions; alternatively, the first reinforcing plate 4 and the water-cooled panel sheet 1 and the second reinforcing plate 5 may be positioned by notches provided in the periphery and claws fitted into the notches, or may be directly machined by machining or the like to obtain the convex portions, without using the convex portions and the concave portions for positioning.
The connecting pipe 3 is provided with a limiting part 11 at the root position of the connecting end, the limiting part 11 shown in the figure is a connecting pipe pier head, the connecting pipe pier head is machined and formed by adopting a pier manufacturing process, the connecting pipe pier head is formed by overlapping two layers of pipe walls after being outwards protruded and deformed, the connecting pipe pier head is of a double-layer structure when viewed from the cross section, the connecting pipe pier head is in a radial convex ring shape and is semicircular on the side surface, and the lower surface of the connecting pipe pier head is in contact with the end surface of the second flanging hole 7. The connecting pipe 3 limits the depth of the connecting end of the connecting pipe into the first flanging hole 6 and the second flanging hole 7 through the connecting pipe pier head.
Of course, the stopper may be formed in other manners, such as integrally forming an annular flange directly on the outer surface of the adapter 3, or welding an annular flange on the outer surface of the adapter 3, or the like.
Referring to fig. 6, fig. 6 is a partially enlarged view of a portion II in fig. 5.
As shown in the figure, the first reinforcing plate 4 is a double-composite plate, one surface of which is provided with an outer composite layer 12, and the other surface is provided with an inner composite layer 13; the second reinforcing plate 5 is a single composite plate, and an inner composite layer 14 is arranged on one surface, which is attached to the first reinforcing plate 4, of the second reinforcing plate; through the brazing process, the melted outer composite layer 12 may connect the first flanging hole 6 of the first reinforcing plate 4 with the adapter tube 3, and the melted inner composite layer 14 may connect the second flanging hole 7 of the second reinforcing plate 5 with the adapter tube 3. The welding length and the welding area of the connecting pipe and the reinforcing plate are large, so that the strength of the connecting pipe after welding is improved, and large radial force can be borne.
It should be noted here that the thickness of the composite layer may be 4% to 15% of the thickness of the plate, and further may be 4% to 10%, which not only has higher strength, but also has more beautiful welding seam. The composite layer may be provided on one of the opposite sides of the first reinforcing plate 4 and the second reinforcing plate 5, or on both of the opposite sides of the water-cooled panel sheet 1 and the first reinforcing plate 4.
Further, the composite layer is provided on the opposite sides of the first reinforcing plate 4 and the second reinforcing plate 5, so that the annular region D formed between the first burring hole 6 and the second burring hole 7 is filled with a part of the molten solder at the time of soldering, and the strength of the burring bent portion can be improved. Furthermore, no matter radial tension or thrust, the flanging directions of the two flanging parts are opposite, so that the flanging part can be prevented from being damaged and leaking.
The processing method of the heat exchanger comprises the following steps:
during assembly, the first reinforcing plate 4 is firstly overlapped on the water-cooling plate sheet 1, the first convex part 9 on the water-cooling plate sheet 1 is embedded into the positioning hole 8 of the first reinforcing plate 4, then the second reinforcing plate 5 is overlapped on the first reinforcing plate 4, the second convex part 10 on the second reinforcing plate 5 is embedded into the positioning hole 8 of the first reinforcing plate 4, then the connecting pipe 3 is inserted into the first flanging hole 6 and the second flanging hole 7, the connecting end of the connecting pipe 3, the first flanging hole 6 and the second flanging hole 7 are riveted and positioned before welding, and after riveting, the connecting end is welded and fixed through modes such as brazing.
If the positioning mechanism formed by the positioning hole 8, the first protrusion 9 and the second protrusion 10 is not used, the corresponding embedding step can be omitted, and other steps are substantially the same as the above-described processing method and will not be described repeatedly.
The above embodiments are merely preferred embodiments of the present invention, and are not limited thereto, and on the basis of the above embodiments, various embodiments can be obtained by performing targeted adjustment according to actual needs. For example, two sets of the first positioning mechanism and the second positioning mechanism are arranged along a diagonal direction with the connecting pipe 3 as a center, or the convex portions on the first reinforcing plate 4 and the second reinforcing plate 5 are integrally formed, or the convex portions on the first reinforcing plate 4 and the second reinforcing plate 5 are separately processed and manufactured and then connected to the reinforcing plates, and so on. This is not illustrated here, since many implementations are possible.
This takeover welded structure of water-cooling board sheet 1 has increased first reinforcing plate 4 and second reinforcing plate 5 on the water-cooling board, first reinforcing plate 4 and second reinforcing plate 5 are connected the back with water-cooling board sheet 1, not only the area of welding increases, and, the link of takeover 3 and the first flanging hole 6 of first reinforcing plate 4 and the second flanging hole 7 welded connection of second reinforcing plate 5, the welding length of takeover 3 has been lengthened, be favorable to controlling the straightness that hangs down, the increase of area of welding and the extension of welding length can multiplicable take over 3 intensity after-welding, make takeover 3 receive great radial force also be difficult for tearing from the bottom, better welding reliability has.
It should be noted that, in the heat exchanger provided in this embodiment, specifically, the water-cooling plate sheet 1 in the battery thermal management system of the electric vehicle may be connected with other components such as a battery cooler to form a circulation loop, so as to implement a heat exchange function, the loop is provided with various types of pipeline pieces and corresponding joints for connection, a pipeline of the loop is connected with the water-cooling plate sheet 1 by using the above-mentioned connecting pipe welding structure, and other structures refer to the prior art and are not described herein again.
It should be noted here that the welding structure may also be applied to other heat exchangers, for example, a plate heat exchanger, and the welding structure of the end plate sheet or the bottom plate sheet and the connection pipe of the plate heat exchanger may be similar to the welding structure of the water cooling plate sheet and the connection pipe, and will not be described here again.
The heat exchanger provided by the present invention has been described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. A heat exchanger comprises a plate sheet and a connecting pipe, and is characterized by further comprising a first reinforcing plate and a second reinforcing plate, the plate is provided with a mounting hole, the first reinforcing plate is superposed on the plate, the second reinforcing plate is superposed on the first reinforcing plate, the first reinforcing plate is provided with a first flanging part, a first flanging hole is formed on the first flanging part, the first flanging part extends into the mounting hole, the second reinforcing plate is provided with a second flanging part, a second flanging hole is formed on the second flanging part, the first flanging hole corresponds to the second flanging hole, the flanging direction of the first flanging part is opposite to that of the second flanging part, and one end of the connecting pipe extends into the first flanging hole and the second flanging hole and is welded and fixed with the corresponding hole walls of the first flanging hole and the second flanging hole; the first reinforcing plate is welded and fixed with the plate, and the first reinforcing plate is welded and fixed with the second reinforcing plate.
2. The heat exchanger according to claim 1, wherein a first positioning mechanism is arranged between the first reinforcing plate and the plate, a second positioning mechanism is arranged between the second reinforcing plate and the first reinforcing plate, the first positioning mechanism is welded and fixed with the first reinforcing plate or the plate, and the second positioning mechanism is welded and fixed with the first reinforcing plate or the second reinforcing plate.
3. The heat exchanger of claim 1, wherein a first positioning mechanism is disposed between the first reinforcing plate and the plate, and a second positioning mechanism is disposed between the second reinforcing plate and the first reinforcing plate; the first positioning mechanism comprises a convex part or a concave part arranged on the first reinforcing plate and a concave part or a convex part arranged on the plate, and the first reinforcing plate is positioned by matching the convex part or the concave part with the concave part or the convex part of the plate; the second positioning mechanism comprises a convex part or a concave part arranged on the second reinforcing plate and a concave part or a convex part arranged on the first reinforcing plate, and the second reinforcing plate is positioned by matching the convex part or the concave part with the concave part or the convex part of the first reinforcing plate.
4. The heat exchanger of claim 3, wherein the first reinforcing plate is provided with a positioning hole, the sheet is provided with a first protrusion, the second reinforcing plate is provided with a second protrusion opposite to the first protrusion, the first positioning mechanism comprises the first protrusion, the second positioning mechanism comprises the second protrusion, and both the first protrusion and the second protrusion extend into the positioning hole.
5. The heat exchanger of claim 4, wherein the first and second projections are secured by welding.
6. The heat exchanger according to any one of claims 1 to 5, wherein an annular region (D) is formed between the first burring and the second burring, and the annular region (D) is filled with a portion of molten solder so that the burring bending of the first reinforcing plate, the burring bending of the second reinforcing plate, and the nipple are fixed integrally.
7. A method for manufacturing a heat exchanger, wherein the heat exchanger is the heat exchanger as claimed in any one of claims 1 to 5, and the method for manufacturing the heat exchanger comprises the following steps:
providing a plate, a first reinforcing plate and a second reinforcing plate which are provided with a composite layer capable of melting, wherein the value range of the ratio of the thickness of the composite layer to the thickness of the plate is as follows: 4% -15%;
the first reinforcing plate is superposed on the plate, the first flanging part extends into the mounting hole, the second reinforcing plate is superposed on the first reinforcing plate, and the first flanging hole is opposite to the second flanging hole;
the connecting pipe is inserted into the first flanging hole and the second flanging hole;
and (6) brazing.
8. A method for manufacturing a heat exchanger, wherein the heat exchanger is the heat exchanger as claimed in claim 4, 5 or 6, and the method for manufacturing the heat exchanger comprises the following steps:
providing a plate, a first reinforcing plate and a second reinforcing plate which are provided with a composite layer capable of melting, wherein the value range of the ratio of the thickness of the composite layer to the thickness of the plate is as follows: 4% -10%;
the first reinforcing plate is superposed on the plate, the first convex part extends into the positioning hole, and the first flanging part extends into the mounting hole;
the second reinforcing plate is superposed on the first reinforcing plate, the second convex part extends into the positioning hole, the first flanging hole is opposite to the second flanging hole, and the range of the distance between the first convex part and the second convex part is as follows: 0.05mm to 0.4mm, the first projection and/or the second projection being provided with a meltable composite layer;
the connecting pipe is inserted into the first flanging hole and the second flanging hole;
and (6) brazing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811551039.7A CN111336856B (en) | 2018-12-18 | 2018-12-18 | Heat exchanger and processing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811551039.7A CN111336856B (en) | 2018-12-18 | 2018-12-18 | Heat exchanger and processing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111336856A true CN111336856A (en) | 2020-06-26 |
| CN111336856B CN111336856B (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811551039.7A Active CN111336856B (en) | 2018-12-18 | 2018-12-18 | Heat exchanger and processing method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010240678A (en) * | 2009-04-02 | 2010-10-28 | Seki Kogyo Kk | Plate laminated structure, plate reinforced structure, plate connected structure, and plate lamination method |
| CN204175731U (en) * | 2014-10-29 | 2015-02-25 | 珠海格力电器股份有限公司 | Connecting structure of overlapped thin sheet metal parts |
| CN205298202U (en) * | 2016-01-12 | 2016-06-08 | 安徽江淮汽车股份有限公司 | Sheet metal connected structure and car |
| JP2018146022A (en) * | 2017-03-03 | 2018-09-20 | 株式会社ティラド | Flange structure |
| CN208196014U (en) * | 2018-03-28 | 2018-12-07 | 江阴市博汇机械成套设备有限公司 | A kind of anti-welding deformation tooling for starching spool |
-
2018
- 2018-12-18 CN CN201811551039.7A patent/CN111336856B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010240678A (en) * | 2009-04-02 | 2010-10-28 | Seki Kogyo Kk | Plate laminated structure, plate reinforced structure, plate connected structure, and plate lamination method |
| CN204175731U (en) * | 2014-10-29 | 2015-02-25 | 珠海格力电器股份有限公司 | Connecting structure of overlapped thin sheet metal parts |
| CN205298202U (en) * | 2016-01-12 | 2016-06-08 | 安徽江淮汽车股份有限公司 | Sheet metal connected structure and car |
| JP2018146022A (en) * | 2017-03-03 | 2018-09-20 | 株式会社ティラド | Flange structure |
| CN208196014U (en) * | 2018-03-28 | 2018-12-07 | 江阴市博汇机械成套设备有限公司 | A kind of anti-welding deformation tooling for starching spool |
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| Publication number | Publication date |
|---|---|
| CN111336856B (en) | 2023-05-23 |
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