CN111852263A - Retractable plate turnover garage door - Google Patents

Retractable plate turnover garage door Download PDF

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Publication number
CN111852263A
CN111852263A CN202010718404.XA CN202010718404A CN111852263A CN 111852263 A CN111852263 A CN 111852263A CN 202010718404 A CN202010718404 A CN 202010718404A CN 111852263 A CN111852263 A CN 111852263A
Authority
CN
China
Prior art keywords
door
connecting rod
plate
guide
retractable
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.)
Pending
Application number
CN202010718404.XA
Other languages
Chinese (zh)
Inventor
毕永强
崔俊
赵杰
王旭阳
张波
余子豪
刘振扬
史晟源
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.)
Xian Aeronautical University
Original Assignee
Xian Aeronautical University
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 Xian Aeronautical University filed Critical Xian Aeronautical University
Priority to CN202010718404.XA priority Critical patent/CN111852263A/en
Publication of CN111852263A publication Critical patent/CN111852263A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06BFIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/32Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing
    • E06B3/34Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing with only one kind of movement
    • E06B3/42Sliding wings; Details of frames with respect to guiding
    • E06B3/44Vertically-sliding wings
    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05FDEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00Power-operated mechanisms for wings
    • E05F15/60Power-operated mechanisms for wings using electrical actuators
    • E05F15/603Power-operated mechanisms for wings using electrical actuators using rotary electromotors
    • E05F15/665Power-operated mechanisms for wings using electrical actuators using rotary electromotors for vertically-sliding wings
    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06BFIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/32Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing
    • E06B3/50Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing with more than one kind of movement
    • E06B3/5009Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing with more than one kind of movement where the sliding and rotating movements are necessarily performed simultaneously
    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06BFIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B7/00Special arrangements or measures in connection with doors or windows
    • E06B7/28Other arrangements on doors or windows, e.g. door-plates, windows adapted to carry plants, hooks for window cleaners

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  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Power-Operated Mechanisms For Wings (AREA)

Abstract

The invention discloses a retractable type plate-turning garage door which comprises a door frame body, a guide plate, a first door plate and a second door plate, wherein the guide plate is rotatably arranged on the door frame body; the door frame body is provided with a turnover mechanism for driving the first door panel to rotate, and the second door panel is provided with a second door panel driving mechanism for driving the second door panel to reciprocate along the vertical direction of the guide plate; this technical scheme's contraction type turns over board garage door for traditional garage door, this garage door can also realize the flexible function of vertical direction when realizing the upset of horizontal direction, and the time of opening the door is shorter, and the security performance is better, has improved the living standard at home, and overall structure is simple ingenious, and transmission operation part is continuous stable, easily control and restoration.

Description

Retractable plate turnover garage door
Technical Field
The invention relates to the technical field of garage doors, in particular to a retractable type plate-turning garage door.
Background
The garage door in the market is mainly a rolling door, also has a few flap gate, and these doors often need the car owner to get off the manual door that opens, and the prominent feature is that the speed of opening the door is slow.
Patent No. cn201822163748.x a flap garage door convenient for production and installation discloses a rail-type flap door, wherein a door panel travels along a rail, and comprises a fixed door panel and a plurality of movable door panels which are hinged with each other and arranged from top to bottom; setting the movable door plate close to the fixed door plate as a top movable plate, and setting the movable door plate farthest away from the fixed door plate as a bottom movable plate; the overturning bracket is detachably connected with the top movable plate and is in sliding connection with the track; two adjacent movable door plates are hinged through a hinge assembly; the bottom bracket is detachably connected with the bottom movable plate and is in sliding connection with the track; the driving system comprises a strip-shaped chain box, a pull rod and a motor; although this turns over board garage door application scope is wide, opens the door steadily, but does not obviously promote in the speed of opening the door, falls into the stability greatly reduced that hinged joint made its door plant for the door plant to the door plant simultaneously.
Therefore, a retractable type plate-turning garage door is needed, and the problems that the door opening speed is low, the safety performance is low, the stability effect is poor in the operation process, the maintenance is inconvenient and the like are solved.
Disclosure of Invention
Compared with the traditional garage door, the retractable type plate-turning garage door provided by the invention can realize the functions of turning in the horizontal direction and stretching in the vertical direction, has the advantages of shorter door opening time, better safety performance, improvement on the living standard of a house, simple and ingenious integral structure, continuous and stable transmission operation part and easiness in control and repair.
A retractable type plate-turning garage door comprises a door frame body, a guide plate, a first door plate and a second door plate, wherein the guide plate is rotatably arranged on the door frame body; the door frame body is provided with a turnover mechanism for driving the first door plate to rotate, and the second door plate is provided with a second door plate driving mechanism for driving the second door plate to reciprocate along the vertical direction of the guide plate.
Further, the door frame body comprises an installation vertical frame, a transverse installation frame vertically arranged at the end part of the installation vertical frame and a triangular support frame arranged on the installation vertical frame; a first connecting rod is hinged between the end of the triangular support frame and the guide plate, and an air spring used for being matched with the first connecting rod to rotate is hinged between the triangular support frame and the first connecting rod.
Further, the turnover mechanism comprises two installation bases which are respectively arranged on the transverse installation frame and the installation vertical frame, a first driving motor arranged at the end part of the installation base, a screw rod arranged between the two installation bases and connected with the first driving motor, a nut slider matched with the screw rod for use, and a second connecting rod assembly arranged between the nut slider and the first door plate.
Further, the second connecting rod assembly comprises an upper connecting rod, a lower connecting rod and a locking device for connecting the upper connecting rod and the lower connecting rod; the end part of the lower connecting rod is of a U-shaped groove structure, the upper connecting rod is inserted in the lower connecting rod, radial mounting holes matched with each other are formed in the end parts of the lower connecting rod and the upper connecting rod, and the end part of the lower connecting rod protrudes outwards along the radial direction to form two parallel supporting stand columns; the locking device comprises a pin sleeve which is matched with the supporting upright post, a pressure spring which is arranged in the pin sleeve and a safety pin which is arranged at the end part of the pressure spring and radially penetrates through the upper connecting rod and the lower connecting rod, and the safety pin penetrates through the radial mounting hole.
Furthermore, a plurality of guide sliding chutes are arranged on the guide plates in parallel relatively, two guide plates are arranged, and the two guide plates are symmetrically arranged on two sides of the first door plate relative to the vertical central line of the first door plate; the guide sliding groove comprises a first guide sliding groove, a second guide sliding groove and a third guide sliding groove which are sequentially arranged along the width direction of the guide plate.
Further, the second door panel driving mechanism comprises a second driving motor arranged on the second door panel, a driving gear connected with the second driving motor and a rack fixedly arranged in the third guide sliding chute; the second door panel is arranged in the second guide groove in a sliding mode; and the second driving motor drives the gear and the rack to be matched and drives the second door panel to reciprocate along the second guide groove.
Furthermore, a slide rail is arranged on the transverse installation frame, and a guide wheel matched with the slide rail for use is fixedly arranged at the end part of the guide plate.
Further, be provided with the mounting panel of U type structure between two mount pads, be provided with on the mounting panel and be used for the gliding guide rail of nut slider.
Furthermore, be provided with the connecting block on the first door plant, second link assembly is "L" type structure, and second link assembly one end is articulated to be set up in the connecting block, and the second link assembly other end is connected the setting with the nut slider.
Further, the upper end of the second door panel is provided with a yielding opening for installing a connecting block, and the transverse installing frame is provided with two suspension rods.
The invention has the beneficial effects that:
compared with the traditional garage door, the retractable type plate-turning garage door has the advantages that the garage door can realize the turning in the horizontal direction and the stretching function in the vertical direction, the door opening time is shorter, the safety performance is better, the household living standard is improved, the integral structure is simple and ingenious, the transmission operation part is continuous and stable, and the control and the repair are easy.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of the turnover mechanism of the present invention;
FIG. 3 is a side view of the turnover mechanism of the present invention;
FIG. 4 is a cross-sectional view of the invention A-A;
FIG. 5 is a schematic view of a door panel according to the present invention;
FIG. 6 is an enlarged view of the invention at B.
Detailed Description
FIG. 1 is a schematic view of the overall structure of the present invention; FIG. 2 is a schematic structural view of the turnover mechanism of the present invention; FIG. 3 is a side view of the turnover mechanism of the present invention; FIG. 4 is a cross-sectional view of the invention A-A; FIG. 5 is a schematic view of a door panel according to the present invention, and FIG. 6 is an enlarged view of the position B according to the present invention; as shown in the figure, the retractable type plate-turning garage door comprises a door frame body 1, a guide plate 2 rotatably arranged on the door frame body 1, a first door plate 3 fixedly connected with the guide plate 2 and a second door plate 4 slidably arranged on the guide plate 2; the door frame body 1 is provided with a turnover mechanism 5 for driving a first door panel to rotate, and the second door panel 4 is provided with a second door panel driving mechanism for driving the second door panel 4 to reciprocate along the vertical direction of the guide plate (namely, the vertical direction in fig. 1); compared with the traditional garage door, the retractable type plate-turning garage door has the advantages that the garage door can realize the turning in the horizontal direction and the stretching function in the vertical direction, the door opening time is shorter, the safety performance is better, the living standard of a house is improved, the integral structure is simple and ingenious, the transmission operation part is continuous and stable, and the control and the part replacement are easy.
In this embodiment, the doorframe body 1 includes an installation stand 101, a horizontal installation frame 102 vertically installed at an end (upper end portion) of the installation stand 101, and a triangular support frame 103 installed on the installation stand 101; a first connecting rod 7 is hinged between the end of the triangular support frame 103 and the guide plate 2, and an air spring 8 used for being matched with the first connecting rod 7 to rotate is hinged between the triangular support frame 103 and the first connecting rod 7. 7 one ends of first connecting rod are articulated to be set up on triangular supports frame 103, 7 other ends of first connecting rod are articulated to be set up in 2 sides of deflector, 8 one ends of air spring are articulated to be set up in 7 middle parts of first connecting rod, 8 other ends of air spring are articulated to be set up on triangular supports frame 103, 2 drives 7 rotations of first connecting rod when rotating of deflector, 8 extensions of air spring or shorten the rotation of 7 first connecting rods of cooperation, play the supporting role, air spring 8 adopts towed air spring etc. is all can among the prior art, here does not do too much to give unnecessary details, overall structure is simple, operating stability is good.
In this embodiment, the turnover mechanism 5 includes two installation bases 501 respectively disposed on the horizontal installation frame 102 and the installation stand 101, a first driving motor 502 disposed at an end of the installation base 501, a lead screw 503 disposed between the two installation bases 501 and connected to the first driving motor 502, a nut slider 504 used in cooperation with the lead screw 503, and a second link assembly disposed between the nut slider 504 and the first door panel 3. Two mount pads 501 set up respectively on horizontal installing frame 102 and installation grudging post 101, second link assembly one end and nut slider 504 fixed connection set up, the second link assembly other end sets up with first door plant 3 is articulated, first driving motor 502 drives the lead screw and rotates and then drive nut slider 504 reciprocating linear motion, second link assembly then drives first door plant 3 and realizes the turning motion, first link 7 supports first door plant 3 and realizes the cooperation pivoted process.
In this embodiment, the second link assembly includes an upper link 504, a lower link 505, and a lock for connecting the upper link and the lower link; the end part of the lower connecting rod 505 is a U-shaped groove structure 506, the upper connecting rod 504 is inserted into the lower connecting rod 505, the end parts of the lower connecting rod 505 and the upper connecting rod 504 are provided with radial mounting holes which are matched with each other, and the end part of the lower connecting rod 505 protrudes outwards along the radial direction to form two parallel supporting upright posts 507; the locking device comprises a pin sleeve 508 matched with the support column 507, a compression spring 509 arranged in the pin sleeve 508 and a safety pin 511 arranged at the end part of the compression spring 509 and radially penetrating through the upper connecting rod 504 and the lower connecting rod 505, wherein the safety pin 511 is arranged in the radial mounting hole in a penetrating mode. (the radial direction is the horizontal direction shown in fig. 4) the end of the lower connecting rod 505 is fixedly connected with a clamping part with a U-shaped groove structure 506, which is convenient for installing the upper connecting rod 504, of course, the end of the lower connecting rod can be designed into a hollow cylindrical structure, the upper connecting rod can be assembled by form fit, the upper and lower connecting rods are both provided with radial installation holes, the clamping part of the U-shaped groove structure 506 of the lower connecting rod forms two parallel supporting columns 507 leftwards along the radial direction, a pin sleeve 508 is installed on the supporting columns 507 through a screw, a pressure spring 509 and a safety pin 511 are assembled in the pin sleeve 508, the safety pin 511 passes through the installation holes along the radial direction and locks the component through the pretightening force of the pressure spring 509, of course, a gasket 510 is also arranged between the pin sleeve 508 and the clamping part of the U-shaped groove structure 506, the safety pin generally plays a connecting role under the action of the, the connection can be released by pulling out the safety pin, so that the door can be opened manually.
In this embodiment, a plurality of guide chutes are arranged in parallel on the guide plates 2, two guide plates 2 are provided, and the two guide plates 2 are symmetrically arranged on two sides of the first door plate 3 with respect to a vertical center line (i.e., a symmetry axis in a vertical direction in fig. 1) of the first door plate 3; the guide chute includes a first guide chute, a second guide chute, and a third guide chute arranged in this order along the width direction of the guide plate (i.e., the width direction shown in fig. 5). Two deflectors 2 are all fixed to be set up in the side of first door plant 3, and two wire guide plate 2's the same and all be provided with three direction spout, are convenient for install each part.
In this embodiment, the second door panel driving mechanism includes a second driving motor 6 disposed on the second door panel 4, a driving gear 61 connected to the second driving motor 6, and a rack 62 fixedly disposed in the third guiding chute; the second door panel 4 is arranged in the second guide groove in a sliding manner; the second driving motor 6 drives the gear 61 to cooperate with the rack 62 and drives the second door panel 4 to reciprocate along the second guide groove. The second driving motors 6 are stepping motors, the second driving motors 6 are also symmetrically arranged on two sides of the second door panel 4, the two second driving motors 6 stop moving when moving to set strokes at the same time, the stepping motors 6 are self-locked, the strokes are fixed, and the safety and stability of the whole process are ensured.
In this embodiment, the transverse mounting frame 102 is provided with a slide rail 105, and the end of the guide plate 2 is fixedly provided with a guide wheel 104 used in cooperation with the slide rail 105. Set up slide rail 105 on horizontal installing frame 102, overturn under tilting mechanism 5 drives when first door plant, the leading wheel 104 that the fixed tip of deflector 2 set up simultaneously carries out the horizontal slip in slide rail 105, and slide rail 105 plays support and spacing effect to its first door plant 3, ensures that the mechanism is stable safety in the motion process, operation that can be steady.
In this embodiment, a mounting plate with a U-shaped structure is disposed between the two mounting seats 501, and a guide rail for sliding the nut slider 504 is disposed on the mounting plate. The two mounting seats 501 are arranged at two ends of the mounting plate with the U-shaped structure, the guide rails facilitate the nut sliding block 504 to stably slide on the mounting plate with the U-shaped structure, and the stability of the mechanism is improved.
In this embodiment, the first door panel 3 is provided with a connecting block 511, the second connecting rod assembly is in an "L" shape, one end of the second connecting rod assembly is hinged to the connecting block 511, and the other end of the second connecting rod assembly is connected to the nut slider 504. The connection block 511 is disposed on the first door panel 3, and functions as a rotary connection.
In this embodiment, the upper end of the second door panel 4 is provided with an abdicating opening 91 for installing the connecting block 511, and the transverse installing frame 102 is provided with two suspension rods 9. The abdicating opening 91 is convenient for the second door panel 4 to ascend and be stacked with the first door panel 3, and plays the abdicating and limiting role, and the two suspension rods 9 are fixedly installed and connected with the building, and play the role of supporting and connecting. The whole installation structure is compact, the space is saved, the redundant torque is avoided, and the mechanical condition is met.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims (10)

1. The utility model provides a contraction type turns over board garage door which characterized in that: the door frame comprises a door frame body, a guide plate rotationally arranged on the door frame body, a first door plate fixedly connected with the guide plate and a second door plate slidably arranged on the guide plate; the door frame body is provided with a turnover mechanism for driving the first door plate to rotate, and the second door plate is provided with a second door plate driving mechanism for driving the second door plate to reciprocate along the vertical direction of the guide plate.
2. The retractable, flap garage door of claim 1, wherein: the door frame body comprises an installation vertical frame, a transverse installation frame vertically arranged at the end part of the installation vertical frame and a triangular support frame arranged on the installation vertical frame; a first connecting rod is hinged between the end of the triangular support frame and the guide plate, and an air spring used for being matched with the first connecting rod to rotate is hinged between the triangular support frame and the first connecting rod.
3. The retractable, flap garage door of claim 2, wherein: the turnover mechanism comprises two mounting seats, a first driving motor, a lead screw, a nut slider and a second connecting rod assembly, wherein the two mounting seats are respectively arranged on the transverse mounting frame and the mounting vertical frame, the first driving motor is arranged at the end part of each mounting seat, the lead screw is arranged between the two mounting seats and is connected with the first driving motor, the nut slider is matched with the lead screw for use, and the second connecting rod assembly is arranged between the nut slider and the first door plate.
4. The retractable, flap garage door of claim 3, wherein: the second connecting rod assembly comprises an upper connecting rod, a lower connecting rod and a locking device for connecting the upper connecting rod and the lower connecting rod; the end part of the lower connecting rod is of a U-shaped groove structure, the upper connecting rod is inserted in the lower connecting rod, radial mounting holes matched with each other are formed in the end parts of the lower connecting rod and the upper connecting rod, and the end part of the lower connecting rod protrudes outwards along the radial direction to form two parallel supporting stand columns; the locking device comprises a pin sleeve which is matched with the supporting upright post, a pressure spring which is arranged in the pin sleeve and a safety pin which is arranged at the end part of the pressure spring and radially penetrates through the upper connecting rod and the lower connecting rod, and the safety pin penetrates through the radial mounting hole.
5. The retractable, flap garage door of claim 4, wherein: a plurality of guide chutes are arranged on the guide plates in parallel relatively, two guide plates are arranged, and the two guide plates are symmetrically arranged on two sides of the first door plate relative to the vertical central line of the first door plate; the guide sliding groove comprises a first guide sliding groove, a second guide sliding groove and a third guide sliding groove which are sequentially arranged along the width direction of the guide plate.
6. The retractable, flap garage door of claim 5, wherein: the second door panel driving mechanism comprises a second driving motor arranged on the second door panel, a driving gear connected with the second driving motor and a rack fixedly arranged in the third guide sliding chute; the second door panel is arranged in the second guide groove in a sliding mode; and the second driving motor drives the gear and the rack to be matched and drives the second door panel to reciprocate along the second guide groove.
7. The retractable, flap garage door of claim 6, wherein: the transverse installation frame is provided with a slide rail, and the end part of the guide plate is fixedly provided with a guide wheel matched with the slide rail.
8. The retractable, flap garage door of claim 3, wherein: the mounting plate is provided with a U-shaped structure between the two mounting seats, and the mounting plate is provided with a guide rail for sliding the nut and the sliding block.
9. The retractable, flap garage door of claim 8, wherein: the first door plate is provided with a connecting block, the second connecting rod assembly is of an L-shaped structure, one end of the second connecting rod assembly is hinged to the connecting block, and the other end of the second connecting rod assembly is connected with the nut sliding block.
10. The retractable, flap garage door of claim 9, wherein: the upper end of the second door panel is provided with a yielding opening for installing a connecting block, and the transverse installation frame is provided with two suspension rods.
CN202010718404.XA 2020-07-23 2020-07-23 Retractable plate turnover garage door Pending CN111852263A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010718404.XA CN111852263A (en) 2020-07-23 2020-07-23 Retractable plate turnover garage door

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010718404.XA CN111852263A (en) 2020-07-23 2020-07-23 Retractable plate turnover garage door

Publications (1)

Publication Number Publication Date
CN111852263A true CN111852263A (en) 2020-10-30

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ID=72950441

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010718404.XA Pending CN111852263A (en) 2020-07-23 2020-07-23 Retractable plate turnover garage door

Country Status (1)

Country Link
CN (1) CN111852263A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115535809A (en) * 2022-10-13 2022-12-30 福建力霸机械科技股份有限公司 Single-opening and plate-turning dual-purpose discharge door

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115535809A (en) * 2022-10-13 2022-12-30 福建力霸机械科技股份有限公司 Single-opening and plate-turning dual-purpose discharge door
CN115535809B (en) * 2022-10-13 2024-01-30 福建力霸机械科技股份有限公司 Single-open and turning plate dual-purpose discharging door

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