CN217330007U - Outdoor unit with protection structure for refrigeration air-conditioning equipment - Google Patents

Outdoor unit with protection structure for refrigeration air-conditioning equipment Download PDF

Info

Publication number
CN217330007U
CN217330007U CN202123240178.8U CN202123240178U CN217330007U CN 217330007 U CN217330007 U CN 217330007U CN 202123240178 U CN202123240178 U CN 202123240178U CN 217330007 U CN217330007 U CN 217330007U
Authority
CN
China
Prior art keywords
outdoor unit
fixedly connected
door curtain
piece
rails
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202123240178.8U
Other languages
Chinese (zh)
Inventor
刘清
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Boneng Technology Co ltd
Original Assignee
Boneng Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boneng Technology Co ltd filed Critical Boneng Technology Co ltd
Priority to CN202123240178.8U priority Critical patent/CN217330007U/en
Application granted granted Critical
Publication of CN217330007U publication Critical patent/CN217330007U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Curtains And Furnishings For Windows Or Doors (AREA)

Abstract

The application provides a refrigeration for air conditioning equipment off-premises station with protective structure belongs to air conditioning equipment technical field. The outdoor unit with the protection structure for the refrigeration air-conditioning equipment comprises an outdoor unit assembly and a door curtain assembly. The outer machine component comprises a shell, a condenser, a compressor and a fan, wherein the condenser and the compressor and the fan are fixedly connected with the inner wall of the shell, the door curtain component comprises a slide rail, a toothed rail, a traction piece and a door curtain piece, the slide rail is provided with two sliding rails, the two sliding rails are respectively fixedly connected with the upper end and the lower end of the outer edge of the shell, the toothed rail is provided with two toothed rails, the two toothed rails are respectively and correspondingly fixedly connected with the slide rail, and two ends of the traction piece are respectively and movably connected with the slide rail. In this application, the door curtain subassembly can close automatic shrinkage and expansion along with the start-up of outer machine subassembly, and the fragile condenser fin of protection does not receive the damage of external force, has improved outer machine subassembly's reliability.

Description

Outdoor unit with protection structure for refrigeration air-conditioning equipment
Technical Field
The application relates to the technical field of air conditioning equipment, in particular to an outdoor unit with a protection structure for refrigeration air conditioning equipment.
Background
An outdoor unit of a refrigeration air conditioner is generally provided therein with a condenser, a fan, and a compressor for dissipating heat from a high-temperature refrigerant of the indoor unit through the condenser, so that the condenser is generally provided with a large number of ultra-thin fins for increasing a heat dissipation area.
However, a large number of ultra-thin fins are exposed outside and are very fragile, the outdoor unit is sometimes easily impacted by foreign matters, the condenser is damaged once impacted, the elasticity of the fins is poor, and the condenser cannot recover by itself once damaged, so that the condenser completely loses the ventilation and heat dissipation effects after a long time.
SUMMERY OF THE UTILITY MODEL
In order to make up for the above deficiencies, the present application provides an outdoor unit for a refrigeration and air-conditioning apparatus with a protective structure, which aims to solve the above problems in the background art.
The embodiment of the application provides an outdoor unit with a protection structure for refrigeration air-conditioning equipment, which comprises an outdoor unit assembly and a door curtain assembly.
The outer machine component comprises a machine shell, a condenser, a compressor and a fan, wherein the condenser, the compressor and the fan are fixedly connected with the inner wall of the machine shell, the door curtain component comprises two slide rails, a rack rail, a traction piece and a door curtain piece, the two slide rails are respectively and fixedly connected with the upper end and the lower end of the outer edge of the machine shell, two toothed rails are arranged and are respectively and fixedly connected with the corresponding slide rails, two ends of the traction piece are respectively movably connected with the two slide rails, two ends of the traction piece are respectively meshed with the two toothed rails, one end of the door curtain piece is fixedly connected with the traction piece, the other end of the door curtain piece is fixedly connected with the machine shell, the lower end of the door curtain piece is connected with the inner wall of the shell in a sliding mode, and the upper end and the lower end of the door curtain piece are located in the middle of the corresponding toothed rails respectively.
In the implementation process, the sliding rail and the rack are arranged along the outer edge of the condenser, the door curtain piece is dragged to expand and contract by the traction piece moving left and right along the rack, when the air conditioner outdoor unit is started, the traction piece pushes the door curtain piece to fold and contract so that the condenser is completely exposed to normally work, when the air conditioner outdoor unit is closed, the traction piece pulls the door curtain piece to extend, the fragile condenser part is wrapped and shielded along the sliding rail and the rack, so that the fragile fins on the condenser are prevented from being damaged, the vertical support and the movement track limitation of the traction piece are facilitated by the arrangement of the sliding rail, the rack is used for the meshing force generation of the traction piece, it needs to be noted that the number of teeth on the inner side and the outer side of the rack is consistent in the turning part, and the teeth on the outer side are slightly larger in the distance than the teeth on the inner side, and the matching clearance between the rack and the traction piece is utilized for compensation, the difference in the length of the tracks inside and outside the arc portion allows the traction element to move smoothly through the bend.
In a specific embodiment, the traction member comprises a traction strip and at least two pairs of rollers, and the two pairs of rollers are respectively and rotatably connected with two ends of the traction strip.
In a specific implementation scheme, all the slide rails are provided with wheel grooves matched with the corresponding rollers, and two ends of the traction strip are respectively in rolling connection with the two slide rails through the rollers and the wheel grooves.
In the implementation process, the rollers move in the sliding rails and are used for supporting the traction strips in the vertical direction and facilitating the smoothness of the movement of the traction strips.
In a specific implementation scheme, the traction piece further comprises two rotating shafts and two gears, the traction strips are arranged in a hollow mode, and the other rotating shaft is rotatably connected with the inner walls of all the traction strips.
In a specific embodiment, four gears are provided, and each gear is fixedly connected with one end of the corresponding rotating shaft.
In a specific embodiment, two gears at the same end are meshed with each other, and all the gears movably penetrate through the traction strip and are meshed with the corresponding racks.
In the above-mentioned realization in-process, it is rotatory to drive four gears through two pivots, and two gear intermeshing with the one end, can guarantee that all gears are all rotatory with fast, a posture that is used for guaranteeing to pull the strip when removing keeps, and at the turn part, the tooth number in cogged rail inboard and the outside keeps unanimous, and the tooth in the outside compares the tooth of inboard slightly on the interval, the cooperation clearance that utilizes cogged rail and gear compensates the orbit length difference of the partial inside and outside of pitch arc, make to pull the strip and can remove smoothly and cross the curve.
In a specific implementation scheme, the traction piece further comprises a motor, the motor is a double-shaft speed reduction motor, the motor is fixedly connected with the inner wall of the traction strip, and an output shaft of the motor is connected in series with one of the rotating shafts.
In the implementation process, the motor is internally provided with the reduction gear set, so that the motor with smaller volume can also realize larger traction force, and the double shafts are arranged to facilitate the motor to be connected in series on a rotating shaft, thereby being beneficial to the full utilization of the internal space of the traction strip.
In a specific embodiment, the door curtain piece comprises an elastic sheet and a protective plate, the elastic sheet is arranged in a corrugated shape, one end of the elastic sheet is fixedly connected with the casing, and the other end of the elastic sheet is fixedly connected with the traction strip.
In a specific embodiment, the lower end of the elastic sheet is connected with the inner wall of the casing in a sliding manner, and the guard plate is fixedly adhered to the plane part of the elastic sheet.
In a specific embodiment, the elastic sheet is movably clamped with the rack.
In the implementation process, the elastic sheet has the characteristic of a spring, the elastic sheet can be unfolded and contracted along with the movement of the traction strip, the protective plate is used for increasing the strength of the elastic sheet, after the elastic sheet is completely unfolded, the elastic sheet still keeps a corrugated state, after the elastic sheet is impacted, a plurality of sharp corners on the elastic sheet can be clamped into teeth of corresponding tooth tracks, a plurality of triangular stable structures are formed, the main protective plate of the impact force bears and transmits the impact force to the tooth tracks, larger supporting force can be obtained, the fragile condenser fins can be protected, the protective plate is only used for enhancing the strength of the plane part of the elastic sheet, the bent part of the sharp corner can be unfolded and contracted by using the elasticity of the elastic sheet, so that the elastic sheet is not strengthened, the elastic sheet is only partially clamped into the tooth tracks, and when the traction strip pulls or pushes the elastic sheet, the sharp corners of the elastic sheet can be automatically withdrawn from the teeth.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic structural view of an outdoor unit of a refrigeration and air-conditioning apparatus having a protective structure according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of a connection structure between a curtain frame and a cabinet according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a connection relationship between a traction member and a sliding rail and a rack provided by an embodiment of the present application;
fig. 4 is a schematic structural view of a connection relationship between a door curtain member and a pulling strip according to an embodiment of the present application.
In the figure: 10-an outer unit assembly; 110-a housing; 120-a condenser; 130-a compressor; 140-a fan; 20-a door curtain assembly; 210-a slide rail; 220-rack; 230-a traction member; 231-a tow bar; 232-a roller; 233-a rotating shaft; 234-gear; 235-a motor; 240-door curtain piece; 241-shrapnel; 242-shield plate.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of 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. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
Referring to fig. 1, an outdoor unit of a refrigerating and air-conditioning apparatus having a protective structure includes an outdoor unit assembly 10 and a curtain assembly 20.
The door curtain assembly 20 can automatically contract and expand along with the starting and closing of the outer unit assembly 10, protects the fragile condenser 120 fins from being damaged by external force, and improves the reliability of the outer unit assembly 10.
Referring to fig. 1 to 4, the outdoor unit assembly 10 includes a casing 110, a condenser 120, a compressor 130, and a fan 140, wherein the condenser 120, the compressor 130, and the fan 140 are all fixedly connected to an inner wall of the casing 110, the door curtain assembly 20 includes two slide rails 210, two rack rails 220, a traction member 230, and a door curtain member 240, the two slide rails 210 are respectively fixedly connected to upper and lower ends of an outer edge of the casing 110, the two rack rails 220 are provided, the two rack rails 220 are respectively fixedly connected to the corresponding slide rails 210, two ends of the traction member 230 are respectively movably connected to the two slide rails 210, two ends of the traction member 230 are respectively engaged with the two rack rails 220, one end of the door curtain member 240 is fixedly connected to the traction member 230, the other end of the door curtain member 240 is fixedly connected to the casing 110, a lower end of the door curtain member 240 is slidably connected to an inner wall of the casing 110, and upper and lower ends of the door curtain member 240 are respectively located between the corresponding rack rails 220. The sliding rail 210 and the rack 220 are arranged along the outer edge of the condenser 120, the door curtain member 240 is drawn to unfold and retract by the drawing member 230 moving left and right along the rack 220, when the outdoor unit of the air conditioner is started, the drawing member 230 pushes the door curtain member 240 to fold and retract so that the condenser 120 is fully exposed to normally work, when the outdoor unit of the air conditioner is closed, the drawing member 230 draws the door curtain member 240 to extend, the fragile condenser 120 is partially wrapped and shielded along the sliding rail 210 and the rack 220 so as to prevent the fragile fins on the condenser 120 from being damaged, the vertical supporting and moving trajectory of the drawing member 230 is facilitated by the arrangement of the sliding rail 210, the rack 220 is used for meshing force of the drawing member 230, it should be noted that the number of teeth on the inner side and the outer side of the rack 220 is slightly larger in the turning part, the teeth on the outer side are slightly larger in the interval than the teeth on the inner side, and the fit clearance between the rack 220 and the drawing member 230 is used for compensating, the difference in the length of the trajectory inside and outside the arc segments allows the pulling member 230 to move smoothly through the curve.
The traction member 230 includes a traction bar 231 and rollers 232, at least two pairs of the rollers 232 are provided, and the two pairs of the rollers 232 are respectively rotatably connected with two ends of the traction bar 231. All offer on all slide rails 210 with the race that corresponds gyro wheel 232 looks adaptation, draw strip 231 both ends to pass through gyro wheel 232 and race and be connected with two slide rails 210 rolls respectively. The roller 232 moves in the slide rail 210 to support the drag strip 231 in a vertical direction and facilitate smooth movement of the drag strip 231.
The pulling member 230 further comprises two rotating shafts 233 and two gears 234, the two rotating shafts 233 are arranged, the pulling strips 231 are arranged in a hollow manner, and the other rotating shaft 233 is rotatably connected with the inner walls of all the pulling strips 231. Four gears 234 are provided, and each gear 234 is fixedly connected with one end of the corresponding rotating shaft 233. The two gears 234 at the same end are engaged with each other, and all the gears 234 movably penetrate through the traction bar 231 and are engaged with the corresponding racks 220. Drive four gears 234 through two pivots 233 and rotate, and two gears 234 intermeshing with the one end, can guarantee that all gears 234 are all rotatory with fast, a posture that is used for guaranteeing to pull strip 231 when removing keeps, and in the part of turning, the tooth quantity in the inboard and outside of rack 220 keeps unanimous, and the tooth in the outside compares the tooth of inboard slightly on the interval, utilize the fit clearance of rack 220 and gear 234 to compensate the orbit length difference of the partly inboard outside of pitch arc, make to pull strip 231 and can move smoothly and cross the curve.
Referring to fig. 1 to 4, the drawing member 230 further includes a motor 235, the motor 235 is a dual-shaft speed-reducing motor, the motor 235 is fixedly connected to the inner wall of the drawing bar 231, and an output shaft of the motor 235 is connected in series to one of the rotating shafts 233. The motor 235 is internally provided with a reduction gear set, so that the motor 235 with a small size can also realize large traction force, and the arrangement of the double shafts facilitates the motor 235 to be connected in series on the rotating shaft 233, thereby being beneficial to the full utilization of the internal space of the traction strip 231.
The door curtain member 240 includes an elastic sheet 241 and a guard plate 242, the elastic sheet 241 is disposed in a wave-fold shape, one end of the elastic sheet 241 is fixedly connected to the housing 110, and the other end of the elastic sheet 241 is fixedly connected to the traction strip 231. The lower end of the elastic piece 241 is slidably connected to the inner wall of the housing 110, and the guard plate 242 is fixedly attached to the flat surface of the elastic piece 241. The elastic piece 241 is movably clamped with the rack 220. The resilient plate 241, which has a spring characteristic, can be expanded and contracted with the movement of the drag bar 231, the guard plate 242 is used to increase the strength of the elastic sheet 241, and after the elastic sheet 241 is completely unfolded, the elastic sheet 241 still keeps a folding state, when the impact occurs, the sharp corners of the elastic sheet 241 will be clamped into the teeth of the corresponding rack 220 to form a plurality of triangular fixing structures, the impact force is mainly born by the protective plate 242 and transmitted to the rack 220, a larger supporting force can be obtained, which is beneficial to protecting the fragile condenser 120 fins, wherein the protecting plate 242 is only used for enhancing the strength of the plane part of the elastic sheet 241, and the part with sharp corners bent is expanded and contracted by the elasticity of the elastic sheet 241, therefore, it is not reinforced, it should be noted that the elastic sheet 241 is only partially clamped into the rack 220, when the pulling strip 231 pulls or pushes the elastic piece 241, the sharp corner of the elastic piece 241 can be automatically withdrawn from the tooth.
The working principle of the outdoor unit with the protection structure for the refrigeration air-conditioning equipment is as follows: the sliding rail 210 and the rack 220 are both arranged along the outer edge of the condenser 120, and the four gears 234 are driven by the motor 235 to synchronously rotate, can roll along the rack 220, thereby, the pulling strip 231 moves left and right along the sliding rail 210, the corrugated spring plate 241 is pulled to expand and contract, when the outdoor unit of the air conditioner is turned on, the drawing bar 231 pushes the elastic sheet 241 to fold and contract to expose the condenser 120 completely for normal operation, when the air conditioner outdoor unit is closed, the pulling strip 231 pulls the elastic sheet 241 to stretch, the weak condenser 120 is partially wrapped and shielded along the sliding rail 210 and the rack 220, when the impact occurs, the sharp corners of the elastic sheet 241 will be clamped into the teeth of the corresponding rack 220 to form a plurality of triangular fixing structures, the impact force is mainly born by the protective plate 242 and transmitted to the rack 220, a greater support force is available to help protect the fragile condenser 120 fins from damage.
It should be noted that the specific model specifications of the casing 110, the condenser 120, the compressor 130, the fan 140, the roller 232, the rotating shaft 233, the gear 234 and the motor 235 need to be determined by type selection according to the actual specification of the device, and the specific type selection calculation method adopts the prior art in the field, so detailed description is omitted.
The power supply of the compressor 130, the fan 140 and the motor 235 and the principle thereof will be apparent to those skilled in the art and will not be described in detail herein.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. An outdoor unit with a protection structure for a refrigeration air-conditioning equipment is characterized by comprising
The outdoor unit assembly (10) comprises a machine shell (110), a condenser (120), a compressor (130) and a fan (140), wherein the condenser (120), the compressor (130) and the fan (140) are fixedly connected with the inner wall of the machine shell (110);
a door curtain assembly (20), the door curtain assembly (20) comprising a slide rail (210), a rack rail (220), a pull member (230), and a door curtain member (240), two slide rails (210) are arranged, the two slide rails (210) are respectively and fixedly connected with the upper end and the lower end of the outer edge of the shell (110), two toothed rails (220) are arranged, the two toothed rails (220) are respectively fixedly connected with the corresponding sliding rails (210), two ends of the traction piece (230) are respectively movably connected with the two slide rails (210), the two ends of the traction piece (230) are respectively meshed with the two tooth tracks (220), one end of the door curtain piece (240) is fixedly connected with the traction piece (230), the other end of the door curtain piece (240) is fixedly connected with the machine shell (110), the lower end of the door curtain piece (240) is connected with the inner wall of the machine shell (110) in a sliding way, the upper end and the lower end of the door curtain piece (240) are respectively positioned in the middle of the corresponding tooth track (220).
2. The outdoor unit of claim 1, wherein the drawing member (230) comprises at least two pairs of drawing bars (231) and rollers (232), and the two pairs of rollers (232) are rotatably connected to two ends of the drawing bars (231).
3. The outdoor unit of claim 2, wherein all the sliding rails (210) are provided with wheel grooves adapted to the corresponding rollers (232), and two ends of the traction bar (231) are respectively connected to the two sliding rails (210) through the rollers (232) and the wheel grooves in a rolling manner.
4. The outdoor unit of claim 3, wherein the outdoor unit of the air conditioning equipment with the protective structure further comprises two rotating shafts (233) and two gears (234), the two rotating shafts (233) are hollow, and the other rotating shaft (233) is rotatably connected to the inner wall of all the pulling strips (231).
5. The outdoor unit of claim 4, wherein four gears (234) are provided, and each gear (234) is fixedly connected to one end of the corresponding rotating shaft (233).
6. The outdoor unit of claim 5, wherein the two gears (234) at the same end are engaged with each other, and all the gears (234) are movably inserted into the pull strip (231) to engage with the corresponding rack (220).
7. The outdoor unit of claim 6, wherein the outdoor unit of the air conditioning unit with the protective structure further comprises a motor (235), the motor (235) is a dual-shaft speed-reducing motor, the motor (235) is fixedly connected to the inner wall of the pulling strip (231), and an output shaft of the motor (235) is connected to one of the rotating shafts (233) in series.
8. The outdoor unit of claim 7, wherein the curtain member (240) comprises a resilient strip (241) and a guard plate (242), the resilient strip (241) is disposed in a corrugated shape, one end of the resilient strip (241) is fixedly connected to the casing (110), and the other end of the resilient strip (241) is fixedly connected to the pulling strip (231).
9. The outdoor unit of claim 8, wherein the lower end of the elastic plate (241) is slidably connected to the inner wall of the casing (110), and the protective plate (242) is fixedly attached to the flat surface of the elastic plate (241).
10. The outdoor unit of claim 9, wherein the resilient tab (241) is movably engaged with the rack (220).
CN202123240178.8U 2021-12-21 2021-12-21 Outdoor unit with protection structure for refrigeration air-conditioning equipment Active CN217330007U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202123240178.8U CN217330007U (en) 2021-12-21 2021-12-21 Outdoor unit with protection structure for refrigeration air-conditioning equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202123240178.8U CN217330007U (en) 2021-12-21 2021-12-21 Outdoor unit with protection structure for refrigeration air-conditioning equipment

Publications (1)

Publication Number Publication Date
CN217330007U true CN217330007U (en) 2022-08-30

Family

ID=82989250

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202123240178.8U Active CN217330007U (en) 2021-12-21 2021-12-21 Outdoor unit with protection structure for refrigeration air-conditioning equipment

Country Status (1)

Country Link
CN (1) CN217330007U (en)

Similar Documents

Publication Publication Date Title
CN104101032B (en) Dustproof air conditioner outdoor unit
CN204026869U (en) Automatic aspirating air-conditioner outdoor unit
CN217330007U (en) Outdoor unit with protection structure for refrigeration air-conditioning equipment
CN209692966U (en) A kind of outdoor communication base station outdoor signal transferring device
CN204026868U (en) Dust-proof air-conditioner outdoor unit
CN213841116U (en) Indoor machine of air conditioner
CN213683874U (en) Building exterior window sunshade and heat preservation integrated device
CN204100524U (en) Door-plate motion structure and air-conditioner
CN212252921U (en) Air condensing units protector
CN211044977U (en) Projection display device
CN206357965U (en) Free-standing solar energy cooling sunshading board
WO2021047511A1 (en) Automatic curtain
CN112177211B (en) Energy-saving curtain wall
CN209811875U (en) Air-cooled dustproof oil cooler for machine tool
CN212109163U (en) Dustproof structure for air-cooled refrigeration equipment
CN110686321A (en) Outer quick-witted condenser dust keeper of components of a whole that can function independently air conditioner, outer machine of air conditioner, air conditioner
CN215373084U (en) Self-movable air curtain type kitchen freezer
CN220815488U (en) Flat plate type rolling shutter door device
CN206503547U (en) A kind of outward pushing type energy-saving roll-up window
CN218410156U (en) Water-cooling type constant temperature and humidity air conditioner
CN218328796U (en) Combined easy-to-maintain refrigeration equipment
CN203848471U (en) Air outlet assembly and air conditioner with the same
CN208983531U (en) A kind of anticlogging refrigeration air-conditioner
CN216554039U (en) Steam turbine exhaust steam direct air cooling temperature adjusting device
CN221116303U (en) Hot melt adhesive film auxiliary winding device

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant