CN217676528U - Side pulling device for crane and crane comprising same - Google Patents
Side pulling device for crane and crane comprising same Download PDFInfo
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- CN217676528U CN217676528U CN202221983517.3U CN202221983517U CN217676528U CN 217676528 U CN217676528 U CN 217676528U CN 202221983517 U CN202221983517 U CN 202221983517U CN 217676528 U CN217676528 U CN 217676528U
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Abstract
The utility model relates to a crane equipment technical field, especially a side draw device and contain this side draw crane of device for hoist, prop driving piece, taut wire rope and taut hoist engine including the top, prop the driving piece and be provided with two and the symmetry sets up on the both sides face of jib loading boom, and taut wire rope symmetry sets up in the top and props the upper and lower both sides of driving piece, and both ends are connected with jib loading boom and top respectively and prop the driving piece, and taut hoist engine sets up on the jib loading boom, taut wire rope's one end is connected on taut hoist engine in order to realize through taut hoist engine that the line that lies in between the top of jib loading boom homonymy props driving piece, taut wire rope and the jib loading boom forms right angled triangle. The utility model discloses a side draw device for hoist simple structure, the processing and the equipment of being convenient for set up the shore driving piece in jib loading boom both sides and removed the hoist and received construction environment's space restriction, and improved the stability of jib loading boom jointly with drawknot wire rope, guaranteed construction safety.
Description
Technical Field
The utility model relates to a crane equipment technical field, especially a side draw device and contain this side and draw hoist of device for hoist.
Background
At present, with the rapid development of the hoisting industry, the hoisting height of the crane is higher and higher, the hoisting tonnage is also larger and higher, and the requirements on the hoisting capacity and the use safety of the crane are also higher. The crane boom of the traditional crane is longer and longer, and due to the influence of the structure of the crane boom, under the adverse conditions of large ground gradient, inclined dragging, sudden rotation of the boom frame or strong wind and the like, the crane boom is large in deformation and deflection on a rotation plane, is easy to generate lateral deformation, and is broken when serious, so that the hoisting safety is influenced.
In the prior art, a crane boom is generally designed with a larger width-to-height ratio to coordinate the structural capacity of the crane boom in a luffing plane and a rotating plane, but the problem of limitation of transportation size and weight is easy to exist, and the problem of lateral stability of the crane boom, especially under adverse conditions such as lateral gradient and the like, cannot be substantially changed.
In order to solve the above problems, chinese patent application No. CN101927967B discloses a method and a structure for controlling and enhancing lateral stability of a crawler crane boom, in which support cables are respectively added on two sides of a rotation plane of a main boom of the crawler crane, lateral pull fixing devices are respectively added on two sides of a joint of a main platform and the boom, the main boom and the lateral pull fixing devices are connected by the support cables, and a pressure sensor is additionally arranged on an oil cylinder of the lateral pull fixing devices. According to the invention, the restoring force generated by the support stay cables is utilized, or the length, the installation position and the tension of the support stay cables are preset, so that the lateral deformation of the arm support is effectively controlled, the constraint state of the arm support in a rotation plane is changed, and the integral lateral rigidity and the stability of the crane arm support are effectively improved. However, the two sides of the joint of the main platform and the arm support are respectively provided with the side pulling fixing devices, so that the width of the crawler crane is increased, and the crawler crane cannot be applied when the space of a construction site is limited, the main stress part of the crane arm under the condition of rotation or strong wind is the middle rod section of the crane arm, and the crane arm is not provided with a protection device, so that the potential danger of instability exists.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a side draws device and contains this side and draw the hoist of device for hoist to solve among the prior art stability of crane boom and strengthen the technical problem that the device can't be suitable for narrow and small space and have stability hidden danger.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a side pull apparatus for a crane, comprising:
two jacking driving parts are symmetrically arranged on two side surfaces of the crane boom, and the moving direction of the pushing end of each jacking driving part is vertical to the rotation plane of the crane boom;
the tensioning steel wire rope is symmetrically arranged on the upper side and the lower side of the jacking driving part corresponding to the jacking driving part, two ends of the tensioning steel wire rope are respectively connected with the jacking arms and the jacking ends of the jacking driving part, and the tensioning steel wire rope is used for releasing or contracting corresponding lengths when the jacking ends of the jacking driving part move so as to tension the jacking arms and the jacking driving part;
the tensioning winch is arranged at the position where the tensioning steel wire rope is connected with the crane boom correspondingly to the tensioning steel wire rope, and one end of the tensioning steel wire rope is connected to the tensioning winch so as to realize the bundling and the releasing through the tensioning winch;
the top support driving piece, the tensioning steel wire rope and the connecting line between the crane booms which are positioned on the same side of the crane boom and correspondingly arranged form a right-angled triangle.
The beneficial effects of the above technical scheme are: the utility model discloses a side draw device for hoist is through setting up the shoring driving piece in the both sides of jib loading boom, can adjust the top according to the construction demand and prop the top of driving piece and push away the length, can withdraw the top when the construction finishes the end, reduce the holistic width size of hoist, and the top props the driving piece and equally divide the both sides of jib loading boom for two parts about it advances the shape taut respectively, tensioning effect has been strengthened, release and restraint the size change that can make taut wire rope's taut length adaptation top prop the driving piece through taut hoist engine to taut wire rope, tensioning force when guaranteeing taut wire rope and connecting, the line between the top prop driving piece that is located the jib loading boom homonymy and connecting piece and the jib loading boom is right angled triangle, when one side atress of jib loading boom, taut wire rope that is located jib loading boom correspondence one side can be taut through the top prop the driving piece, eliminate the hidden danger that the atress warp, avoid the jib loading boom to roll over the emergence of arm. The utility model discloses a side draw device for hoist simple structure, the processing and the equipment of being convenient for have removed the hoist and have received construction environment's space restriction through setting up the shore driving piece in jib loading boom both sides, and have improved the stability of jib loading boom jointly with drawknot wire rope, have guaranteed construction safety.
Furthermore, the jacking driving part is an electric hydraulic jack, the fixed end of the electric hydraulic jack is detachably connected with the crane boom, and the pushing end of the electric hydraulic jack is connected with the connecting piece.
Has the advantages that: the electro-hydraulic jack is that the multistage formula pushes away the structure, when guaranteeing to push away length, can also guarantee that the back of finishing in the construction is pushed away the end and is withdrawed the back, and electro-hydraulic jack's length satisfies the requirement that reduces the whole width size of hoist, and the position of being convenient for adjust electro-hydraulic jack on the jib loading boom of removable facility also makes things convenient for the maintenance to change.
Furthermore, a fixing plate is welded on the crane boom corresponding to the installation position of the electric hydraulic jack, and a fastening bolt for fixing the electric hydraulic jack is arranged on the fixing plate in a penetrating mode.
Has the beneficial effects that: simple structure, the convenience is installed and is dismantled the electro-hydraulic jack.
Furthermore, the electric hydraulic jack is arranged in the middle of the crane boom, a connecting hanging ring is arranged at the pushing end of the electric hydraulic jack, and two tensioning winches on the same side of the electric hydraulic jack are respectively arranged at positions close to the end part of the crane boom.
Has the beneficial effects that: the hydraulic jack is arranged in the middle of the crane boom, two corresponding connecting steel wire ropes can be connected to the end part of the corresponding crane boom in the largest range, the tensioning effect is improved, the connecting hanging ring is convenient to connect with the tensioning steel wire rope, friction when the tensioning steel wire rope is connected is reduced, and the service life of the tensioning steel wire rope is prolonged.
A crane, comprising:
the device comprises a base, a mast bracket, a stabilizing rod, a crane boom, a moving system, an amplitude varying system, a lifting system, a balancing weight and a side pulling device; the base is arranged on a mobile system, a mast support is arranged on the left side of the base, two ends of a stabilizing rod are respectively connected with the base and the mast support, a cargo boom is hinged to the base, the mobile system is a crawler-type advancing system, a luffing system comprises an adjusting winch arranged on the mast support, an adjusting steel wire rope connected with the top of the cargo boom is arranged on the adjusting winch, the adjusting winch is used for adjusting the inclination angle of the cargo boom, a lifting system comprises a lifting winch arranged on the base, a pulley block arranged on the top of the cargo boom and a lifting steel wire rope wound on the lifting winch, the other end of the lifting steel wire rope penetrates through the pulley block and is connected with a lifting hook at the end part, a balancing weight is arranged above the base and close to the position between the masts, and a side pulling device is arranged on the cargo boom;
the side pulling device comprises two top support driving parts and connecting parts, the two top support driving parts are symmetrically arranged on two side surfaces of the crane boom, and the moving direction of the pushing ends of the top support driving parts is vertical to the rotation plane of the crane boom; the tensioning steel wire ropes are symmetrically arranged on the upper side and the lower side of the top support driving part corresponding to the top support driving part, two ends of the tensioning steel wire ropes are respectively connected with the top pushing ends of the crane boom and the top support driving part, and the tensioning steel wire ropes are used for releasing or contracting corresponding lengths when the top pushing ends of the top support driving part move so as to tension the crane boom and the top support driving part; the tensioning winch is arranged at the position where the tensioning steel wire rope is connected with the crane boom corresponding to the tensioning steel wire rope, and one end of the tensioning steel wire rope is connected to the tensioning winch to realize the bundling and releasing through the tensioning winch; the top support driving piece, the tensioning steel wire rope and the connecting line between the crane booms which are positioned on the same side of the crane boom and correspondingly arranged form a right-angled triangle.
The beneficial effects of the above technical scheme are: the utility model discloses a hoist is through setting up the side draw gear on the jib loading boom, strengthen the stability of jib loading boom, the top that the jib loading boom both sides set up props the driving piece and can adjust the top that props the driving piece according to the construction demand and push away the length, can withdraw the top when the construction finishes the end, reduce the holistic width size of hoist, and the top props the driving piece and equally divide the both sides of jib loading boom for two parts about it advances the shape respectively and take turns to taut, the tensioning effect has been strengthened, release and contract the size change that can make taut wire rope's taut length adaptation top prop the driving piece through taut hoist engine to taut wire rope, the tensioning force when guaranteeing taut wire rope to connect, the line that is located between the top of jib loading boom homonymy props driving piece and connecting piece and the jib loading boom is right angled triangle, when one side atress at the jib loading boom, taut wire rope that is located jib loading boom correspondence one side can be taut through the top prop the driving piece and can be taut to it, eliminate the emergence of jib loading boom atress deformation, avoid the emergence of jib loading boom. The utility model discloses a side draw device for hoist simple structure, the processing and the equipment of being convenient for have removed the hoist and have received construction environment's space restriction through set up the shore driving piece in jib loading boom both sides, and have improved the stability of jib loading boom jointly with drawknot wire rope, have guaranteed construction safety
Furthermore, the jacking driving part is an electric hydraulic jack, the fixed end of the electric hydraulic jack is detachably connected with the crane boom, and the pushing end of the electric hydraulic jack is connected with the connecting piece.
Has the advantages that: the electric hydraulic jack is a multi-section pushing structure, the pushing length is guaranteed, and meanwhile the length of the electric hydraulic jack can be guaranteed to be recovered at the pushing end after construction is finished, the length of the electric hydraulic jack meets the requirement of reducing the whole width size of the crane, the position of the electric hydraulic jack can be conveniently adjusted on the crane boom through a detachable facility, and maintenance and replacement are convenient.
Furthermore, a fixing plate is welded on the crane boom corresponding to the installation position of the electro-hydraulic jack, and a fastening bolt for fixing the electro-hydraulic jack penetrates through the fixing plate.
Has the advantages that: simple structure, the convenience is installed and is dismantled the electro-hydraulic jack.
Furthermore, the electric hydraulic jack is arranged in the middle of the crane boom, a connecting hanging ring is arranged at the pushing end of the electric hydraulic jack, and the two tensioning winches on the same side of the electric hydraulic jack are respectively arranged at positions close to the end part of the crane boom.
Has the advantages that: the hydraulic jack is arranged in the middle of the crane boom, two correspondingly connected pull steel wire ropes can be connected to the end part of the corresponding crane boom in the largest range, the tensioning effect is improved, the connecting hanging ring is convenient to be connected with the tensioning steel wire rope, friction when the tensioning steel wire rope is connected is reduced, and the service life of the tensioning steel wire rope is prolonged.
Drawings
Fig. 1 is a schematic structural view of a first view angle of a side pulling device for a crane according to the present invention;
fig. 2 is a schematic structural view of a second view angle of the side pulling device for the crane according to the present invention;
fig. 3 is an enlarged view of a in fig. 2.
Description of the reference numerals: 1-cargo boom, 2-electric hydraulic jack, 3-connecting suspension loop, 4-tensioning steel wire rope, 5-tensioning winch, 6-base, 7-mast bracket, 8-stabilizer bar, 9-counterweight block, 10-crawler type advancing system, 11-adjusting winch, 12-adjusting steel wire rope, 13-lifting winch, 14-lifting steel wire rope and 15-lifting hook.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The utility model discloses a concrete embodiment that is used for side of hoist to draw device does:
the utility model discloses a side draw device for hoist includes shore driving piece and connecting piece.
As shown in fig. 1, 2 and 3, two jacking driving parts are symmetrically arranged on two side surfaces of the crane boom 1 and are located in the middle of the crane boom. The moving direction of the pushing end of the jacking driving part is perpendicular to the rotation plane of the crane boom 1, and it should be noted that the rotation plane refers to the rotation plane of the crane boom 1 in the vertical direction. In this embodiment, the shore driving piece is electrohydraulic jack 2, and it should be noted that electrohydraulic jack 2 is prior art, and its structure and operating principle are not described too much here, and electrohydraulic jack 2's stiff end and 1 releasable connection of jib loading boom, specifically, the position welding that corresponds the installation of electrohydraulic jack 2 on the jib loading boom 1 has the fixed plate, wears to be equipped with fastening bolt on the fixed plate, and fastening bolt is used for fixed electrohydraulic jack 2. The pushing end of the electric hydraulic jack 2 is provided with a connecting hanging ring 3.
As shown in fig. 1, 2 and 3, the tensioning steel wire ropes 4 are symmetrically arranged on the upper and lower sides of the electro-hydraulic jack 2 corresponding to the electro-hydraulic jack 2, one end of each tensioning steel wire rope 4 is connected with the connecting suspension loop 3, and the other end is connected with the crane boom 1. The tensioning steel wire rope 4 is used for releasing the corresponding length when the pushing end of the electro-hydraulic jack 2 moves towards the direction far away from the crane boom 1 and contracting the corresponding length when the pushing end moves towards the direction close to the crane boom 1 so as to tension the crane boom 1 and the electro-hydraulic jack 2.
As shown in fig. 1, 2 and 3, the tensioning winches 5 are disposed at positions where the tensioning wire ropes 4 are connected to the boom 1, corresponding to the tensioning wire ropes 4, and two tensioning winches 5 located on the same side of the electrohydraulic jack 2 are disposed at positions near the ends of the boom 1, respectively. One end of the tensioning steel wire rope 4, which is used for being connected with the crane boom 1, is connected to the tensioning winch 5, and the tensioning winch 5 is used for releasing or contracting the tensioning steel wire rope 4 so as to ensure the tensioning effect of the tensioning steel wire rope 4 on the crane boom 1. It should be noted that the hoisting machine is a conventional hoisting machine, and the structure and the operation principle thereof will not be described too much.
As shown in fig. 1, 2 and 3, the connection lines between the electro-hydraulic jack 2 and the tensioning cable 4 located on the same side of the jib 1 and the jib 1 form a right triangle.
The utility model discloses a concrete application method that is used for side of hoist to draw device: the method comprises the steps of starting the electric hydraulic jack 2, controlling the pushing end of the electric hydraulic jack 2 to move towards the direction far away from a crane boom 1, starting the tensioning winch 5 to pay out a tensioning steel wire rope 4, stopping the pushing end of the hydraulic jack from moving when the length of the electric hydraulic jack 2 reaches a set length, changing the rotating direction of the tensioning winch 5 to start winding up the tensioning steel wire rope 4, and stopping the rotation of the tensioning winch 5 when the tensioning steel wire rope 4 is in a tensioning state.
The utility model discloses a side draws device for hoist simple structure, the processing and the equipment of being convenient for set up electronic hydraulic jack through the middle part position in jib loading boom both sides, have removed the space restriction that the hoist received construction environment, and have strengthened the stability of jib loading boom jointly with taut wire rope, have guaranteed construction safety.
The utility model discloses a concrete embodiment of hoist does:
as shown in fig. 1 and fig. 2, the crane of the present invention includes a base 6, a mast support 7, a stabilizer bar 8, a crane boom 1, a moving system, a luffing system, a lifting system, a counterweight 9, and a side pulling device.
As shown in fig. 1 and 2, the base 6 is provided on the moving system; the mast bracket 7 is arranged at the left side of the base 6; two ends of the stabilizer bar 8 are respectively connected with the base 6 and the mast bracket 7; the cargo boom 1 is hinged on the base 6; the mobile system is a crawler-type advancing system 10; the amplitude variation system comprises an adjusting winch 11 arranged on the mast support 7, an adjusting steel wire rope 12 connected with the top of the crane boom 1 is arranged on the adjusting winch 11, and the adjusting winch 11 is used for adjusting the inclination angle of the crane boom 1; the lifting system comprises a lifting winch 13 arranged on the base 6, a pulley block arranged on the top of the crane boom 1 and a lifting steel wire rope 14 wound on the lifting winch 13, wherein the other end of the lifting steel wire rope 14 penetrates through the pulley block and is connected with a lifting hook 15 at the end part; the balancing weight 9 is arranged above the base 6 and close to the position between the masts; the side pulling device is arranged on the crane arm 1.
As shown in fig. 1, 2 and 3, in the present embodiment, the side pulling apparatus is structurally identical to the side pulling apparatus for a crane of the above-described embodiment.
The utility model discloses a concrete application method of hoist: the crane is moved to a position to be constructed through a crawler, the electric hydraulic jack 2 is started, the pushing end of the electric hydraulic jack 2 is controlled to move towards a direction far away from the crane boom 1, the tensioning winch 5 is started to pay off the tensioning steel wire rope 4, when the length of the electric hydraulic jack 2 reaches a set length, the pushing end of the hydraulic jack is stopped to move, the rotating direction of the tensioning winch 5 is changed, the tensioning steel wire rope 4 is started to take up, when the tensioning steel wire rope 4 is in a tensioning state, the tensioning winch 5 stops rotating, the balancing weight 9 is placed on the base 6, the crane boom 1 is pulled up through adjusting the winch 11, the inclination angle of the crane boom 1 is adjusted according to requirements, and the height of the lifting hook 15 from the bottom surface is adjusted through the lifting winch 13 to prepare for lifting heavy objects.
The utility model discloses a hoist has removed the space restriction that the hoist received construction environment through set up electronic hydraulic jack in jib loading boom both sides, and has strengthened the stability of jib loading boom jointly with taut wire rope, has guaranteed construction safety.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A side pull apparatus for a crane, comprising:
two jacking driving parts are symmetrically arranged on two side surfaces of the crane boom, and the moving direction of the pushing end of each jacking driving part is vertical to the rotation plane of the crane boom;
the tensioning steel wire rope is symmetrically arranged on the upper side and the lower side of the jacking driving part corresponding to the jacking driving part, two ends of the tensioning steel wire rope are respectively connected with the jacking arms and the jacking ends of the jacking driving part, and the tensioning steel wire rope is used for releasing or contracting corresponding lengths when the jacking ends of the jacking driving part move so as to tension the jacking arms and the jacking driving part;
the tensioning winch is arranged at the position where the tensioning steel wire rope is connected with the crane boom correspondingly to the tensioning steel wire rope, and one end of the tensioning steel wire rope is connected to the tensioning winch so as to realize the bundling and the releasing through the tensioning winch;
the top support driving piece, the tensioning steel wire rope and the connecting line between the crane booms which are positioned on the same side of the crane boom and correspondingly arranged form a right-angled triangle.
2. The side pulling apparatus for crane according to claim 1, wherein: the jacking driving part is an electric hydraulic jack, the fixed end of the electric hydraulic jack is detachably connected with the crane boom, and the pushing end of the electric hydraulic jack is connected with the connecting piece.
3. The side pull apparatus for a crane according to claim 2, wherein: a fixing plate is welded on the crane boom corresponding to the installation position of the electric hydraulic jack, and a fastening bolt for fixing the electric hydraulic jack is arranged on the fixing plate in a penetrating mode.
4. The side pulling apparatus for crane according to claim 2, wherein: the electric hydraulic jack is arranged at the middle position of the crane boom, the pushing end of the electric hydraulic jack is provided with a connecting hanging ring, and two tensioning winches positioned at the same side of the electric hydraulic jack are respectively arranged at positions close to the end part of the crane boom.
5. A crane, comprising: the device comprises a base, a mast bracket, a stabilizing rod, a crane boom, a moving system, an amplitude varying system, a lifting system, a balancing weight and a side pulling device; the base is arranged on a mobile system, a mast support is arranged on the left side of the base, two ends of a stabilizer bar are respectively connected with the base and the mast support, a cargo boom is hinged to the base, the mobile system is a crawler-type advancing system, a luffing system comprises an adjusting winch arranged on the mast support, an adjusting steel wire rope connected with the top of the cargo boom is arranged on the adjusting winch, the adjusting winch is used for adjusting the inclination angle of the cargo boom, a lifting system comprises a lifting winch arranged on the base, a pulley block arranged on the top of the cargo boom and a lifting steel wire rope wound on the lifting winch, the other end of the lifting steel wire rope penetrates through the pulley block and is connected with a lifting hook at the end part, a balancing weight is arranged above the base and close to the position between the masts, and a side pulling device is arranged on the cargo boom;
the side pulling device comprises two top support driving parts and connecting parts, the two top support driving parts are symmetrically arranged on two side surfaces of the crane boom, and the moving direction of the pushing end of the top support driving part is vertical to the rotation plane of the crane boom; the tensioning steel wire rope is symmetrically arranged on the upper side and the lower side of the jacking driving part corresponding to the jacking driving part, two ends of the tensioning steel wire rope are respectively connected with the jacking arms and the jacking ends of the jacking driving part, and the tensioning steel wire rope is used for releasing or contracting corresponding lengths when the jacking ends of the jacking driving part move so as to tension the jacking arms and the jacking driving part; the tensioning winch is arranged at the position where the tensioning steel wire rope is connected with the crane boom correspondingly to the tensioning steel wire rope, and one end of the tensioning steel wire rope is connected to the tensioning winch so as to realize the bundling and the releasing through the tensioning winch; the top support driving piece, the tensioning steel wire rope and the connecting line between the crane booms which are positioned on the same side of the crane boom and correspondingly arranged form a right-angled triangle.
6. A crane as claimed in claim 5, wherein: the jacking driving piece is an electric hydraulic jack, the fixed end of the electric hydraulic jack is detachably connected with the crane boom, and the jacking end of the electric hydraulic jack is connected with the connecting piece.
7. A crane as claimed in claim 6, wherein: a fixing plate is welded on the crane boom corresponding to the installation position of the electric hydraulic jack, and a fastening bolt for fixing the electric hydraulic jack is arranged on the fixing plate in a penetrating mode.
8. A crane as claimed in claim 6, wherein: the electric hydraulic jack is arranged in the middle of the crane boom, a connecting hanging ring is arranged at the pushing end of the electric hydraulic jack, and the two tensioning winches on the same side of the electric hydraulic jack are respectively arranged at positions close to the end part of the crane boom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221983517.3U CN217676528U (en) | 2022-07-29 | 2022-07-29 | Side pulling device for crane and crane comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221983517.3U CN217676528U (en) | 2022-07-29 | 2022-07-29 | Side pulling device for crane and crane comprising same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217676528U true CN217676528U (en) | 2022-10-28 |
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ID=83720080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221983517.3U Active CN217676528U (en) | 2022-07-29 | 2022-07-29 | Side pulling device for crane and crane comprising same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217676528U (en) |
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2022
- 2022-07-29 CN CN202221983517.3U patent/CN217676528U/en active Active
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