CN211113724U - Equipment shock insulation buffer - Google Patents
Equipment shock insulation buffer Download PDFInfo
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- CN211113724U CN211113724U CN201921770578.XU CN201921770578U CN211113724U CN 211113724 U CN211113724 U CN 211113724U CN 201921770578 U CN201921770578 U CN 201921770578U CN 211113724 U CN211113724 U CN 211113724U
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- shock insulation
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- buffer
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Abstract
The utility model discloses an equipment shock insulation buffer device, which belongs to the field of shock insulation buffer devices, and the technical proposal is characterized in that the device comprises a lower basic connecting plate, a shock insulation buffer plate, an upper basic connecting plate, a lower buffer connecting plate, a shock insulation support, a shock insulation cushion block and an upper panel are fixedly connected on the upper end surface of the lower basic connecting plate from bottom to top in sequence, rubber gaskets are fixedly connected inside two grooves, the lower end surface of the lower buffer connecting plate is in a semicircular shape, thereby effectively avoiding horizontal shearing force generated by an upper structure during earthquake, increasing energy consumption in the horizontal direction, increasing the shock insulation effect of the shock insulation device in the horizontal direction, providing reaction force by the shock insulation support arranged below the shock insulation cushion block, enabling the shock insulation cushion block and the upper panel to reset after being stressed, increasing the consumption of shaking energy, and improving the practicability of the equipment shock insulation buffer device, and meanwhile, the plurality of springs can enable the shock isolation device to reset in the horizontal direction.
Description
Technical Field
The utility model relates to a shock insulation buffer technical field, in particular to equipment shock insulation buffer.
Background
Earthquake is a real and destructive natural disaster, which seriously threatens human society, and the building earthquake-resistant device can reduce the damage of earthquake to buildings and reduce the loss of people's property, and plays a vital role.
However, the existing basic shock insulation buffering technology generally adopts a flat shock insulation layer, the upper structure of the shock insulation buffering technology easily generates horizontal shearing force during shock insulation, and meanwhile, the resetting performance of the shock insulation buffering device is poor.
SUMMERY OF THE UTILITY MODEL
The utility model provides an equipment shock insulation buffer aims at solving present basic shock insulation buffering technique and generally adopts smooth shock insulation layer, and its superstructure produces the level very easily when the shock insulation and to the shearing force, the poor problem of shock insulation buffer resettability simultaneously.
The utility model discloses a realize like this, an equipment shock insulation buffer, including lower basic connecting plate, the up end of basic connecting plate is from supreme fixedly connected with shock insulation buffer board in proper order, last basic connecting plate, buffering connecting plate, shock insulation support, shock insulation cushion and top panel down, two recesses, two have been seted up to the lower terminal surface of top panel the equal fixedly connected with rubber packing ring in inside of recess, supreme fixedly connected with supporting shoe, L connecting block and the rubber snubber block in proper order are down followed to the lower terminal surface of rubber packing ring, four the dashpot of four symmetric distributions is seted up to the up end of basic connecting plate down, four the equal fixedly connected with rubber shock absorber layer in bottom of dashpot inside, the fluting has been seted up to the up end of shock insulation cushion, two elastic reset device of inside bottom fixedly connected with of fluting, two elastic reset device's up end and the lower terminal surface fixed connection of top panel.
In order to carry out spacing and convenient dismouting down basic connecting plate and last basic connecting plate simultaneously with the correcting position with fixing bolt down basic connecting plate, as the utility model discloses an equipment shock insulation buffer is preferred, the up end of rubber shock absorber layer is provided with fixing bolt, fixing bolt's up end runs through the lower terminal surface of last basic connecting plate and extends to the inside of basic connecting plate, the below of going up basic connecting plate is provided with four and fixing bolt assorted fastening nut.
In order to guarantee the effectual shock insulation effect on shock insulation layer, and cooperate fixing bolt, avoid superstructure's excessive displacement, as the utility model discloses an equipment shock insulation buffer is preferred, the up end of the upper and lower terminal surface of shock insulation buffer board, lower basis connecting plate and the lower terminal surface of last basis connecting plate all are "flat tooth" form.
For convenient fixed resilient means, make resilient means can play the shock insulation cushioning effect to the equipment of top panel top, conduct the utility model discloses an equipment shock insulation buffer is preferred, two the middle part of elasticity resetting means has set gradually left connecting rod, resilient means and right connecting rod from a left side to the right side, resilient means fixed connection is between left connecting rod and right connecting rod.
In order to make the top panel play the effect of shock insulation, as the utility model discloses an equipment shock insulation buffer is preferred, elastic device's upper and lower both ends all are provided with coupling spring, coupling spring's the left and right sides respectively with left connecting rod and right connecting rod fixed connection, the upper and lower both ends of left connecting rod and right connecting rod respectively with the lower terminal surface of top panel and the inside bottom sliding connection of fluting.
Prevent that shock insulation cushion from taking place the pressurized destruction in order to make rubber packing ring and rubber shock absorber piece, play protection shock insulation buffer effect for shock insulation buffer's long service life, reliability are high, and first shock insulation spring can make shock insulation device carry out the restoration of horizontal direction with second shock insulation spring simultaneously, and as the utility model discloses an equipment shock insulation buffer is preferred, shock insulation cushion's the left and right sides all is provided with the fixed stay post, the first shock insulation spring of up end fixedly connected with of fixed stay post, terminal surface fixed connection under the other end of first shock insulation spring and the L connecting block, two equal fixedly connected with second shock insulation spring in relative one side of L connecting block, the other end and the fixed stay post fixed connection of second shock insulation spring.
In order to increase second slider and first slider and spout piece frictional force, reduced the ascending power of shaking of shock isolation device in vertical side, made shock isolation device reach the effect of shock insulation buffering, conduct the utility model discloses an equipment shock insulation buffer is preferred, the lower terminal surface fixedly connected with fixed stay block, the below of fixed block has set gradually second slider and first slider from a left side to the right side, the up end difference swing joint of second slider and first slider has second connecting rod and head rod, the other end and the fixed block swing joint of second connecting rod and head rod.
In order to increase the consumption that second slider and first slider rocked the energy, make the part that sets up below the connecting plate under the buffering reduce and shake power, improve the shock insulation effect, as the utility model discloses an equipment shock insulation buffer is preferred, the lower terminal surface sliding connection of second slider and first slider has the spout piece, the up end fixed connection of connecting plate under the lower terminal surface of spout piece and the buffering, fixedly connected with fixing spring between second slider and the first slider
Compared with the prior art, the beneficial effects of the utility model are that:
1. according to the shock insulation buffer device for the equipment, the shock insulation buffer plate is arranged to be the composite rubber plate with the embedded steel frame, the embedded steel frame ensures the strength of the composite rubber plate and is matched with the limit stud, excessive displacement of an upper structure is avoided, the lower end of the lower buffer connecting plate is in a semicircular shape, energy consumption in the horizontal direction is increased, so that the shock insulation effect of the shock insulation device in the horizontal direction is increased, a shock insulation support arranged below a shock insulation cushion block can provide a reaction force, the shock insulation cushion block and the upper plate can reset after being stressed, the consumption of shaking energy is increased, the practicability of the shock insulation buffer device for the equipment is improved, and the shock insulation device can reset in the horizontal direction through the plurality of springs arranged at the same time;
2. according to the shock insulation buffer device for the equipment, the upper end surface and the lower end surface of the shock insulation buffer plate, the upper end surface of the lower base connecting plate and the lower end surface of the upper base connecting plate are arranged to be in a flat tooth shape, so that the bottom does not adopt a flat structure any more, but an embedded structure of a convex edge and a groove is arranged on an upper structure and a bottom support, the structure of the convex edge and the groove can effectively offset horizontal shearing force generated by the upper structure during earthquake, and by matching with a shock insulation layer, damage of the horizontal shearing force generated by the upper structure during earthquake to the shock insulation layer can be effectively avoided, the effective shock insulation effect of the shock insulation layer is ensured, and by matching with a fixing bolt, excessive displacement of the upper;
3. this kind of equipment shock insulation buffer, through all setting up connecting spring at elastic device's upper and lower both ends to when the top panel appears rocking, the gravity of top panel top makes the top panel downwards, and when the top panel was downwards, left connecting rod and right connecting rod can slide to two elasticity resetting means directions respectively, and connecting spring can cushion the sliding speed of left connecting rod and right connecting rod, makes elastic device can follow left connecting rod and right connecting rod simultaneously and changes, makes the top panel play the effect of shock insulation.
Drawings
FIG. 1 is an overall structure diagram of the shock isolation and buffering device of the utility model;
FIG. 2 is a structural diagram of the fixing block of the present invention;
FIG. 3 is a structural diagram of the elastic device of the present invention;
FIG. 4 is a structural diagram of the lower base connection plate of the present invention;
in the figure, 1 is a lower foundation connecting plate, 101 is a buffer groove, 102 is a fixing bolt, 103 is a fastening nut, 104 is a rubber shock-absorbing layer, 2 is an upper foundation connecting plate, 3 is a buffer lower connecting plate, 301 is a connecting block, L is a connecting block, 302 is a first shock-isolating spring, 303 is a second shock-isolating spring, 304 is a rubber shock-absorbing block, 4 is a shock-isolating support, 5 is a shock-isolating cushion block, 501 is a fixing support column, 502 is a groove, 6 is an upper plate, 601 is an elastic resetting device, 602 is a rubber gasket, 603 is a supporting block, 7 is a right connecting rod, 701 is a left connecting rod, 702 is an elastic device, 703 is a connecting spring, 8 is a fixing block, 801 is a fixing spring, 802 is a first connecting rod, 803 is a second connecting rod, 804 is a first sliding block, 805 is a second sliding block, 806 is a sliding groove block, and.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In addition, in the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1-4, the utility model provides an equipment shock insulation buffer, including lower basic connecting plate 1, the up end of lower basic connecting plate 1 from the supreme fixedly connected with shock insulation buffer board 9 in proper order down, go up basic connecting plate 2, cushion down connecting plate 3, isolation bearing 4, shock insulation cushion 5 and top panel 6, two recesses have been seted up to the lower terminal surface of top panel 6, the equal fixedly connected with rubber packing ring 602 in two recesses, the lower terminal surface of rubber packing ring 602 from supreme fixedly connected with supporting shoe 603 in proper order down, L connecting block 301 and rubber snubber block 304, four symmetric distribution's dashpot 101 have been seted up to the up end of lower basic connecting plate 1, the equal fixedly connected with rubber shock absorber layer 104 in the bottom of four dashpot 101 insides, fluting 502 has been seted up to the up end of shock insulation cushion 5, the bottom fixedly connected with two elastic reset device 601 in fluting 502, the up end of two elastic reset device 601 is fixedly connected with the lower terminal surface of top panel 6.
In this embodiment: the shock insulation buffer plate 9 and the upper base connecting plate 2 are fixedly connected with the upper end surface of the lower base connecting plate 1 from bottom to top in sequence, a shock insulation layer with the shock insulation buffer effect does not adopt a flat structure any more, but a convex edge, a groove and the shock insulation buffer plate 9 are arranged above the lower base connecting plate 1 and at the bottom of the upper base connecting plate 2 for embedding, the structure of the convex edge and the groove can effectively offset horizontal shearing force generated by an upper structure during earthquake, the shock insulation buffer plate 9 is matched with the shock insulation buffer plate 9, the shock insulation buffer plate 9 is a composite rubber plate with an embedded steel frame, the composite rubber plate has certain elastic deformation and is corrosion-resistant, the embedded steel frame ensures the strength of the composite rubber plate and is matched with a limit stud, the excessive displacement of the upper structure is avoided, the lower end surface of the buffer lower connecting plate 3 is in a semicircular shape, the horizontal direction shearing force that superstructure produced when the earthquake can effectively be avoided, increase the power consumption under the horizontal direction, with the shock insulation effect of increase isolation device on the horizontal direction, shock insulation support 4 that the 5 below of shock insulation cushion set up can provide reaction force, make shock insulation cushion 5 and 6 atress backs on the top panel, can reset, increase the consumption to rocking energy, improved equipment shock insulation buffer's practicality, a plurality of springs that set up simultaneously can make isolation device carry out the restoration of horizontal direction.
Specifically, the upper end face of the rubber shock absorption layer 104 is provided with a fixing bolt 102, the upper end face of the fixing bolt 102 penetrates through the lower end face of the upper base connection plate 2 and extends into the upper base connection plate 2, and four fastening nuts 103 matched with the fixing bolt 102 are arranged below the upper base connection plate 2.
In this embodiment: the fixing bolts 102 are arranged on the upper end faces of the rubber shock absorption layers 104, so that the lower base connecting plate 1 and the upper base connecting plate 2 are limited and corrected by the fixing bolts 102, and the lower base connecting plate 1 and the upper base connecting plate 2 are convenient to disassemble.
Specifically, the upper end face and the lower end face of the shock insulation buffer plate 9, the upper end face of the lower base connecting plate 1 and the lower end face of the upper base connecting plate 2 are in a shape of flat teeth.
In this embodiment: through the upper and lower terminal surface with shock insulation buffer board 9, the up end of lower base connecting plate 1 sets to be "flat tooth" form with the lower terminal surface of last base connecting plate 2, make the bottom no longer adopt smooth structure, but set up the gomphosis structure of bead and recess on superstructure and bottom support, the level that superstructure produced when bead and recess can effectively offset the earthquake is to the shearing force, cooperation shock insulation layer, the level that superstructure produced when the earthquake can effectively be avoided is to the harm of shearing force to shock insulation layer, guarantee the effectual shock insulation effect of shock insulation layer, and cooperation fixing bolt 102, avoid superstructure's excessive displacement.
Specifically, the middle parts of the two elastic resetting devices 601 are sequentially provided with a left connecting rod 701, an elastic device 702 and a right connecting rod 7 from left to right, and the elastic device 702 is fixedly connected between the left connecting rod 701 and the right connecting rod 7.
In this embodiment: through setting up elastic device 702 to left connecting rod 701 and right connecting rod 7 middle part to conveniently fix elastic device 702, make elastic device 702 can play the shock insulation cushioning effect to the equipment of top panel 6 top.
Specifically, the upper end and the lower end of the elastic device 702 are both provided with a connecting spring 703, the left side and the right side of the connecting spring 703 are respectively fixedly connected with the left connecting rod 701 and the right connecting rod 7, and the upper end and the lower end of the left connecting rod 701 and the right connecting rod 7 are respectively slidably connected with the lower end surface of the upper panel 6 and the bottom end inside the slot 502.
In this embodiment: all set up connecting spring 703 through the upper and lower both ends at resilient means 702, thereby when upper panel 6 appears rocking, the gravity of upper panel 6 top makes upper panel 6 downwards, when upper panel 6 is downwards, left connecting rod 701 and right connecting rod 7 can slide to two elastic reset device 601 directions respectively, connecting spring 703 can cushion the sliding speed of left connecting rod 701 and right connecting rod 7, it changes to make resilient means 702 can follow left connecting rod 701 and right connecting rod 7 simultaneously, make upper panel 6 play the effect of shock insulation, connecting spring 703 that sets up simultaneously can make shock insulation device carry out the reseing of horizontal direction.
Specifically, the left and right sides of isolation cushion 5 all is provided with fixed stay post 501, the first isolation spring 302 of up end fixedly connected with of fixed stay post 501, terminal surface fixed connection under the other end of first isolation spring 302 and L connecting block 301, the equal fixedly connected with second isolation spring 303 in relative one side of two L connecting blocks 301, the other end and the fixed stay post 501 fixed connection of second isolation spring 303.
In the embodiment, the first seismic isolation spring 302 is fixedly connected to the upper end face of the fixed support column 501, when the upper panel 6 faces downwards, the L connecting block 301 limits the upper panel 6 to move downwards, and meanwhile, the rubber gaskets 602 and the rubber shock absorption blocks 304 arranged at the upper end and the lower end of the L connecting block 301 can buffer the downward movement speed of the upper panel 6, so that the fixed support column 501 and the seismic isolation cushion block 5 are protected, the seismic isolation buffer device is long in service life and high in reliability, and meanwhile, the seismic isolation device can be reset in the horizontal direction through the first seismic isolation spring 302 and the second seismic isolation spring 303.
Specifically, the lower end face of the fixed support column 501 is fixedly connected with a fixed block 8, a second slider 805 and a first slider 804 are sequentially arranged from left to right below the fixed block 8, the upper end faces of the second slider 805 and the first slider 804 are respectively and movably connected with a second connecting rod 803 and a first connecting rod 802, and the other ends of the second connecting rod 803 and the first connecting rod 802 are movably connected with the fixed block 8.
In this embodiment: through the other end and the fixed block 8 swing joint with second connecting rod 803 and first connecting rod 802, when isolation cushion 5 rocks from top to bottom, second connecting rod 803 and first connecting rod 802 receive and extrude at isolation cushion 5, make second connecting rod 803 and second slider 805 and first slider 804 of first connecting rod 802 below slide in the spout piece 806 top, thereby increased second slider 805 and first slider 804 and spout piece 806 frictional force, reduced the ascending power of shaking of seismic isolation device in vertical direction, make seismic isolation device reach the effect of shock insulation buffering.
Specifically, the lower end surfaces of the second slider 805 and the first slider 804 are slidably connected with a chute block 806, the lower end surface of the chute block 806 is fixedly connected with the upper end surface of the buffer lower connecting plate 3, and a fixed spring 801 is fixedly connected between the second slider 805 and the first slider 804.
In this embodiment: through fixed connection fixed spring 801 between second slider 805 and first slider 804 to can increase second slider 805 and the consumption that first slider 804 rocked the energy, make the part that the connecting plate 3 below set up under the buffering reduce and shake power, improve the shock insulation effect.
The working principle is as follows: firstly, a shock insulation buffer plate 9, an upper base connecting plate 2, a buffer lower connecting plate 3, a shock insulation support 4, a shock insulation cushion block 5 and an upper panel 6 are fixedly connected on the upper end surface of a lower base connecting plate 1 in sequence from bottom to top, a shock insulation layer with the shock insulation buffer effect does not adopt a flat structure any more, a convex edge, a groove and the shock insulation buffer plate 9 are arranged above the lower base connecting plate 1 and at the bottom of the upper base connecting plate 2 for embedding, the structure of the convex edge and the groove can effectively offset horizontal shear force generated by an upper structure during earthquake, and the damage of the horizontal shear force generated by the upper structure to the shock insulation buffer plate 9 during earthquake can be effectively avoided by matching the shock insulation buffer plate 9, the lower end surface of the buffer lower connecting plate 3 is in a semicircular shape, so that the horizontal shear force generated by the upper structure during earthquake can be effectively avoided, energy consumption in the horizontal direction is increased, and, the isolation bearing 4 that the 5 below of isolation cushion set up can provide reaction force, make isolation cushion 5 and 6 atress backs on the top panel, can reset, increase the consumption to rocking energy, the practicality of equipment isolation buffer has been improved, the rubber packing ring 602 and the rubber snubber block 304 of setting prevent that isolation cushion 5 from taking place the pressurized and destroying, play protection isolation buffer effect, make isolation buffer's long service life, the reliability is high, first isolation spring 302 and second isolation spring 303 can make isolation device carry out the restoration of horizontal direction simultaneously.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The utility model provides an equipment shock insulation buffer, includes basic connecting plate (1) down, its characterized in that the up end of basic connecting plate (1) is from supreme fixedly connected with shock insulation buffer board (9) in proper order down, goes up basic connecting plate (2), cushions connecting plate (3) down, isolation bearing (4), shock insulation cushion (5) and top panel (6), two recesses have been seted up to the lower terminal surface of top panel (6), two equal fixedly connected with rubber packing ring (602) in the inside of recess, supreme fixedly connected with supporting shoe (603), L connecting block (301) and rubber shock absorber piece (304) in proper order down are followed to the lower terminal surface of rubber packing ring (602), four dashpot (101) of symmetric distribution are seted up to the up end of basic connecting plate (1) down, four equal fixedly connected with rubber shock absorber layer (104) in the bottom of inside of shock insulation groove (101), fluting (502) have been seted up to the up end of shock insulation cushion (5), two elastic reset device (601) are connected with the lower terminal surface fixed connection of top panel (6) in the bottom of fluting (502) inside.
2. An apparatus seismic isolation buffer as claimed in claim 1, wherein: the rubber shock-absorbing layer (104) is provided with fixing bolt (102) on the upper end face, the upper end face of fixing bolt (102) runs through the lower end face of upper foundation connecting plate (2) and extends to the inside of upper foundation connecting plate (2), four fastening nuts (103) matched with fixing bolt (102) are arranged below upper foundation connecting plate (2).
3. An apparatus seismic isolation buffer as claimed in claim 1, wherein: the upper end face and the lower end face of the shock insulation buffer plate (9), the upper end face of the lower base connecting plate (1) and the lower end face of the upper base connecting plate (2) are in a flat tooth shape.
4. An apparatus seismic isolation buffer as claimed in claim 1, wherein: the middle part of the two elastic resetting devices (601) is sequentially provided with a left connecting rod (701), an elastic device (702) and a right connecting rod (7) from left to right, and the elastic device (702) is fixedly connected between the left connecting rod (701) and the right connecting rod (7).
5. An apparatus seismic isolation buffer as claimed in claim 4, wherein: the upper end and the lower end of the elastic device (702) are both provided with connecting springs (703), the left side and the right side of each connecting spring (703) are respectively fixedly connected with the left connecting rod (701) and the right connecting rod (7), and the upper end and the lower end of each connecting rod (701) and the right connecting rod (7) are respectively connected with the lower end face of the upper panel (6) and the bottom end inside the slot (502) in a sliding manner.
6. The shock-isolating buffer device for the equipment according to claim 1, wherein fixed supporting columns (501) are arranged on the left side and the right side of the shock-isolating cushion block (5), a first shock-isolating spring (302) is fixedly connected to the upper end face of each fixed supporting column (501), the other end of each first shock-isolating spring (302) is fixedly connected with the lower end face of each L connecting block (301), a second shock-isolating spring (303) is fixedly connected to the opposite side of each L connecting block (301), and the other end of each second shock-isolating spring (303) is fixedly connected with the corresponding fixed supporting column (501).
7. An apparatus seismic isolation buffer as claimed in claim 6, wherein: the lower terminal surface fixedly connected with fixed block (8) of fixed stay (501), the below of fixed block (8) has set gradually second slider (805) and first slider (804) from a left side to the right side, the up end swing joint of second slider (805) and first slider (804) has second connecting rod (803) and head rod (802) respectively, the other end and fixed block (8) swing joint of second connecting rod (803) and head rod (802).
8. An apparatus seismic isolation buffer as claimed in claim 7, wherein: the lower end faces of the second sliding block (805) and the first sliding block (804) are connected with a sliding groove block (806) in a sliding mode, the lower end face of the sliding groove block (806) is fixedly connected with the upper end face of the buffering lower connecting plate (3), and a fixing spring (801) is fixedly connected between the second sliding block (805) and the first sliding block (804).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921770578.XU CN211113724U (en) | 2019-10-21 | 2019-10-21 | Equipment shock insulation buffer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921770578.XU CN211113724U (en) | 2019-10-21 | 2019-10-21 | Equipment shock insulation buffer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211113724U true CN211113724U (en) | 2020-07-28 |
Family
ID=71703174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921770578.XU Active CN211113724U (en) | 2019-10-21 | 2019-10-21 | Equipment shock insulation buffer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211113724U (en) |
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2019
- 2019-10-21 CN CN201921770578.XU patent/CN211113724U/en active Active
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