CN218024507U - Longitudinal elastic composite non-woven fabric production device - Google Patents
Longitudinal elastic composite non-woven fabric production device Download PDFInfo
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- CN218024507U CN218024507U CN202222468398.4U CN202222468398U CN218024507U CN 218024507 U CN218024507 U CN 218024507U CN 202222468398 U CN202222468398 U CN 202222468398U CN 218024507 U CN218024507 U CN 218024507U
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Abstract
The utility model discloses a longitudinal elastic composite non-woven fabric production device, which relates to the technical field of non-woven fabric production equipment and comprises an elastic layer conveying assembly, a longitudinal stretching assembly, a width expanding assembly, a composite layer feeding assembly, a composite assembly and a winding assembly which are arranged in sequence; the expanding assembly comprises an expanding roller group for transversely expanding the elastic layer; the composite component comprises two pairs of consolidation devices which are symmetrically arranged on the upstream and downstream sides of the non-woven fabric after the elastic layer and the composite layer are combined. The utility model provides a carry out the expanding operation to it before the elastic layer enters into composite component entering elastic layer through the expanding subassembly to effectively reduce the influence that the width reduces after tensile, thereby improve the compound vertical elasticity composite non-woven fabric apparatus for producing of elasticity non-woven fabric quality after compounding.
Description
Technical Field
The utility model relates to a non-woven fabrics production facility technical field especially relates to a vertical elasticity composite nonwoven apparatus for producing.
Background
Nonwoven fabrics, also known as nonwovens, are composed of oriented or random fibers; in order to expand the application range of the non-woven fabric, the elastic composite non-woven fabric is widely researched, and the common high-elasticity non-woven fabric in the market at present generally comprises an upper surface layer, an intermediate layer and a lower surface layer, wherein the intermediate layer is positioned between the upper surface layer and the lower surface layer, both the upper surface layer and the lower surface layer are non-woven fabrics, and the intermediate layer is a thermoplastic elastomer film; and a nonwoven fabric production apparatus is required for producing a highly elastic nonwoven fabric.
Chinese utility model patent with the existing grant publication number CN209832865U discloses a production device of longitudinal elastic composite non-woven fabric, including: the device comprises a non-woven fabric unwinding mechanism I, a non-woven fabric unwinding mechanism II, an elastic film unwinding mechanism, a traction compression roller set, an ultrasonic wave composite mechanism, an elastic non-woven fabric recovery area, a slitting mechanism and a winding mechanism. The non-woven fabric unwinding mechanism I, the non-woven fabric unwinding mechanism II and the elastic film between the non-woven fabric unwinding mechanism I and the non-woven fabric unwinding mechanism II are unwound at a constant speed through the traction compression roller set, meanwhile, the elastic film can be stretched at a multiplying power required by the elastic film by adjusting the speed ratio of the four stretching rollers A, B, C and D of the stretching mechanism, the stretching ratio of the elastic film is more than A and less than B and less than C and less than D, the elastic film is combined with two layers of non-woven fabrics, the elastic film and the D are driven by the traction compression roller set together through the traction compression roller set, and the speed of the non-woven fabrics, the elastic film and the D roller enters the ultrasonic compounding machine at a constant speed to be subjected to ultrasonic welding.
Adopt above-mentioned technical scheme, the stretch roller through different rates realizes the longitudinal stretching to elasticity becomes, later carry out the complex operation of non-woven fabrics on the elastic layer, but in the in-service use process, the elastic layer can lead to the breadth of elastic layer to produce the shrink through the transport after longitudinal stretching's process and the stretching, can produce the inconsistent problem of breadth when further leading to compounding with upper and lower layer non-woven fabrics, finally can have the condition of edge elastic layer disappearance after the elasticity non-woven fabrics replies, influence the quality of non-woven fabrics.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a compound non-woven fabrics apparatus for producing of vertical elasticity through addding the width expansion subassembly, can realize carrying out horizontal width expansion to the elastic layer to effectively reduce the horizontal shrink of elastic layer, effectively reduce the integrality of non-woven fabrics compound back edge department elastic layer, improve the quality of non-woven fabrics.
The above technical purpose of the present invention can be achieved by the following technical solutions:
a longitudinal elastic composite non-woven fabric production device comprises an elastic layer conveying assembly, a longitudinal stretching assembly, a width expanding assembly, a composite layer feeding assembly, a composite assembly and a winding assembly which are arranged in sequence;
the elastic layer conveying assembly comprises two conveying rollers which are arranged in a rotating mode in opposite directions and used for conveying the elastic layer at a constant speed;
the longitudinal stretching assembly comprises a plurality of stretching rollers which are arranged at intervals, the speed of each stretching roller is adjustable, and the speed of the stretching roller positioned on the conveying upstream side of the elastic layer is lower than that of the stretching roller positioned on the conveying downstream side of the elastic layer;
a tenter assembly including a tenter roller group for transversely tentering the elastic layer;
the composite layer feeding assembly comprises a composite layer unwinding roller for unwinding the composite layer and a composite layer cloth guide roller for conveying the composite layer at a constant speed;
the composite assembly comprises two consolidation devices which are symmetrically arranged on the two sides of the upstream and the downstream of the non-woven fabric after the elastic layer and the composite layer are combined;
and the winding assembly comprises two traction rollers which are arranged on one side of the downstream of the composite assembly in opposite directions and rotate at the same speed as the last stage of stretching roller, and the winding roller is arranged on one side of the downstream of the traction rollers in a rotating manner.
Through adopting above-mentioned technical scheme, during the use, the elastic layer gets into from the conveying roller, after vertical stretching assembly is tensile, get into the component of expanding and carry out the operation of expanding, thereby effectively guarantee the width that the elastic layer carried to composite set department, effectively reduce the horizontal shrinkage of elastic layer, thereby guarantee that the elastic layer after the stretching is unanimous basically with the width of composite set non-woven fabrics, later get into composite set compound back, reply the rolling, through this kind of mode, can effectively reduce elastic layer horizontal disappearance after vertical stretching, effectively guarantee the integrality of non-woven fabrics compound back elastic layer, improve the off-the-shelf quality of elastic non-woven fabrics.
The utility model discloses further set up to: the expanding roller group is a plurality of spiral rollers with bidirectional expanding spirals on the roller surface, and the spiral rollers are arranged at an S-shaped interval.
By adopting the technical scheme, the elastic layer is tightly abutted and outwardly expanded in the conveying process of the elastic layer through the bidirectional expanding screw, so that the width of the elastic layer before entering the composite component is effectively ensured.
The utility model discloses further set up to: the expanding assembly further comprises an expanding frame, a plurality of groups of supporting frames are arranged on the expanding frame at intervals, each supporting frame is arranged on the expanding frame at intervals in a splayed shape, and the two supporting frames are correspondingly arranged on two sides of the elastic layer in the width direction respectively, wherein each expanding roller group comprises two clamping wheels which are arranged on the supporting frames in a rotating mode in the opposite direction and are in abutting fit with the elastic layer; wherein the axis direction of each clamping wheel and the conveying direction of the elastic layer form an included angle.
Through adopting above-mentioned technical scheme, be the support frame that the splayed interval set up through the multiunit to and press from both sides tight elastic layer both sides and be the pinch-off blades that the contained angle set up with the elastic layer direction of delivery, can produce the traction force of outside expanding to the in-process that the elastic layer was carried, thereby can realize the expanding operation to the elastic layer.
The utility model discloses further set up to: the supporting frame is arranged on the expanding frame in a sliding mode, and an adjusting screw rod in threaded connection with the supporting frame is rotatably arranged on the expanding frame.
By adopting the technical scheme, the position of the support frame on the expanding frame is adjusted, so that the expanding roller set can adapt to expanding operation of elastic layers with different widths, and the use applicability of the device is improved.
The utility model discloses further set up to: the support frame slides on and is provided with the lift seat, is located the upside the pinch roller rotates and sets up on the lift seat, rotate on the lift seat and be provided with the lifting screw with support frame threaded connection.
Through adopting above-mentioned technical scheme, utilize the lift screw rod to drive the lift seat and go up and down, further adjust the position and the clamp force of pinch roller, make things convenient for the staff to the centre gripping operation of elastic layer on the one hand, on the other hand can effectively guarantee that the pinch roller produces stable clamping-force to the elastic layer, ensures the stable expanding operation to the elastic layer.
The utility model discloses further set up to: the consolidation device is a hot-pressing gluing roller or an ultrasonic welding device.
Through adopting above-mentioned technical scheme, through hot-pressing gluing roller or ultrasonic bonding ware, can realize the stable consolidation operation to composite bed non-woven fabrics or elastic layer.
The utility model discloses further set up to: each stretching roller is arranged at an S-shaped interval, and the stretching rollers are respectively abutted with the pressing rollers with the rotating speeds corresponding to the stretching rollers.
Through adopting above-mentioned technical scheme, the area of contact that the stretch roll that is the S type setting can improve elastic layer and stretch roll further presses the cover to the elastic layer through the compression roller, can reduce the resilience of elastic layer, effectively guarantees the uniformity to the longitudinal stretching size of elastic layer.
The utility model discloses further set up to: and an elastic layer unwinding roller is further rotatably arranged on one side of the upstream of the two conveying rollers.
Through adopting above-mentioned technical scheme, utilize the elastic layer to unreel the roller and carry out whole book to the elastic layer and unreel, improve the convenience that the device used.
The utility model discloses further set up to: an elastic layer receiving device is rotatably arranged on one side of the upstream of the conveying roller, and a melt-blowing die head is arranged above the elastic layer receiving device.
By adopting the technical scheme, the elastic layer receiving device is matched with the melt-blown die head to realize the direct production operation of the elastic layer.
The utility model discloses further set up to: the elastic layer receiving device is characterized in that a receiving layer unwinding roller is arranged on one side of the upstream of the elastic layer receiving device, and auxiliary compression rollers are further rotatably arranged on two sides of the upstream and the downstream of the elastic layer receiving device.
Through adopting above-mentioned technical scheme, utilize and accept the layer and carry out the supplementary operation of accepting of elastic layer, effectively guarantee the fashioned stability of elastic layer.
To sum up, the beneficial technical effects of the utility model are that:
(1) By additionally arranging the expanding component, transverse expanding of the elastic layer can be realized, so that transverse contraction of the elastic layer is effectively reduced, the integrity of the elastic layer at the composite rear edge of the non-woven fabric is effectively reduced, and the quality of the non-woven fabric is improved;
(2) The adjustable support frame can adapt to stretching operations of elastic layers with different specifications, and the use applicability of the device is improved;
(3) The elastic layer unreeling device and the net forming assembly are arranged, so that the elastic layer can be directly supplied, and the use convenience of the device is effectively guaranteed.
Drawings
Fig. 1 is a schematic front view of the overall structure of embodiment 1 of the present invention;
fig. 2 is an axial view of a flattening roll according to embodiment 1 of the present invention;
fig. 3 is a schematic front view of the overall structure of embodiment 2 of the present invention;
fig. 4 is a schematic view showing the axis measurement of the width-expanding frame according to embodiment 2 of the present invention, showing the positional connection relationship of each component on the width-expanding frame;
fig. 5 is a schematic front view of the overall structure of embodiment 3 of the present invention;
reference numerals: 1. an elastic layer unwinding roller; 2. a conveying roller; 3. a stretching roller; 4. a pressure roller; 5. a helical roll; 6. a composite layer unwinding roller; 7. a composite layer cloth guide roller; 8. a consolidation device; 9. a traction roller; 10. a wind-up roll; 11. an expanding frame; 12. a support frame; 13. adjusting the screw rod; 14. a clamping wheel; 15. a lifting seat; 16. a lifting screw; 17. an elastic layer receiving device; 18. a melt-blowing die; 19. a first auxiliary roller; 20. a take-up layer unwinding roller; 21. a second auxiliary roller.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying examples.
Example 1:
referring to the attached figure 1, the longitudinal elastic composite non-woven fabric production device comprises an elastic layer unwinding roller 1, an elastic layer conveying assembly, a longitudinal stretching assembly, a width expanding assembly, a composite layer feeding assembly, a composite assembly and a winding assembly which are sequentially arranged; wherein the elastic layer is preferably an elastic film or an elastic fiber web, and the elastic fiber web is preferably a styrene block copolymer fiber web; the composite layer is conventional non-woven fabric.
The elastic layer conveying assembly comprises two conveying rollers 2 which are arranged in a way of rotating in opposite directions and convey the elastic layer at a constant speed, wherein the two conveying rollers 2 are driven by a conveying motor at a constant speed; when the elastic layer unwinding device works, the elastic layer is conveyed by the two conveying rollers 2 and is unwound from the elastic layer unwinding roller 1 at a constant speed.
Wherein vertical tensile subassembly includes the stretch roller 3 that a plurality of intervals set up and each stretch roller 3's speed is adjustable, and wherein speed adjustable stretch roller 3 is prior art, and its theory of operation is not repeated herein.
The speed of the stretching roller 3 positioned at the conveying upstream side of the elastic layer is lower than that of the stretching roller 3 positioned at the conveying downstream side of the elastic layer; that is, the speed of the stretching rollers 3 through which the elastic layer sequentially passes is sequentially increased, so that the elastic layer is longitudinally stretched through the speed difference, each stretching roller 3 is arranged at an S-shaped interval, and the pressing rollers 4 with corresponding rotating speeds are arranged at the positions of the stretching rollers 3 in an abutting mode. The compression roller 4 can ensure that the stretching roller 3 can stretch the elastic layer stably, effectively reduce the retraction phenomenon of the elastic film generated by the restoring force of the elastic film and effectively ensure the stable stretching operation of the elastic film.
With reference to the attached drawing 2, the expanding assembly comprises an expanding roller set used for transversely expanding the elastic layer, the expanding roller set comprises a plurality of spiral rollers 5 with roll surfaces provided with bidirectional expanding spirals, and the spiral rollers 5 are arranged at S-shaped intervals.
The composite layer feeding assembly comprises a composite layer unwinding roller 6 for unwinding the composite layer and a composite layer cloth guide roller 7 for conveying the composite layer at a constant speed; and the rotating speed of the composite layer cloth guide roller 7 is the same as that of the last stage stretching roller 3, and the composite layer and the elastic layer are synchronously fed through the composite layer unwinding roller 6 and the composite layer cloth guide roller 7.
In another embodiment, the composite layer unwinding roller 6 and the composite layer cloth guiding roller 7 are two sets, and the two sets of composite layer unwinding roller 6 and composite layer cloth guiding roller 7 are respectively disposed on the upper and lower sides of the elastic layer.
The composite component comprises two consolidation devices 8 which are symmetrically arranged at the upstream and downstream sides of the non-woven fabric after the elastic layer and the composite layer are combined; the consolidation device 8 is a hot-pressing gluing roller or an ultrasonic welding device; when the consolidation device 8 is a hot-pressing gluing roller, the rotating speed of the two hot-pressing gluing rollers is consistent with the rotating speed of the last stage of stretching roller 3.
The rolling subassembly includes that two are to rotating the setting in composite component low reaches one side and with last one-level stretching roller 3 with fast pivoted carry over pinch rolls 9, wherein two carry over pinch rolls 9 can press from both sides the elasticity non-woven fabrics after the compound and carry, and 9 low reaches one side of carry over pinch rolls rotates and is provided with wind-up roll 10, and the slew velocity of wind-up roll 10 is less than the rotational speed of carry over pinch rolls 9 to can be that the elasticity non-woven fabrics produces the answer between carry over pinch rolls 9 and wind-up roll 10.
The working principle of the embodiment is as follows: during the use, the elastic layer gets into from conveying roller 2, after vertical stretching assembly is tensile, get into the expanding subassembly and carry out the expanding operation, thereby effectively guarantee the elastic layer and carry the width to composite set department, effectively reduce the horizontal shrinkage of elastic layer, thereby guarantee that the elastic layer after the stretching is unanimous basically with the width of composite bed non-woven fabrics, later get into composite set complex back, elasticity is replied and the rolling, through this kind of mode, can effectively reduce elastic layer vertical stretching back horizontal shrinkage, further guarantee the integrality of non-woven fabrics complex back elastic layer, improve the off-the-shelf quality of elasticity non-woven fabrics.
Example 2:
referring to the attached drawings 3 and 4, a longitudinal elastic composite nonwoven fabric production device is based on the embodiment 1, and is characterized by the following difference with the embodiment 1: the expanding assembly further comprises an expanding frame 11, a plurality of groups of support frames 12 are arranged on the expanding frame 11 at intervals, the support frames 12 are arranged on the expanding frame 11 in a sliding mode along the width direction of the support frames, adjusting screw rods 13 in threaded connection with the support frames 12 are arranged on the expanding frame 11 in a rotating mode, the support frames 12 are arranged on the expanding frame 11 in a splayed mode at intervals along the conveying direction of the elastic layer, and the two corresponding support frames 12 are arranged on two sides of the width direction of the elastic layer correspondingly.
Wherein the expanding roller group comprises two clamping wheels 14 which are arranged on the supporting frame 12 in an opposite rotating way and are tightly matched with the two sides of the upstream and downstream of the elastic layer; wherein the axial direction of each clamping wheel 14 forms an included angle with the conveying direction of the elastic layer; a lifting seat 15 is slidably arranged on the support frame 12 along the height direction of the support frame, a clamping wheel 14 positioned on the upper side is rotatably arranged on the lifting seat 15, and a lifting screw 16 in threaded connection with the support frame 12 is rotatably arranged on the lifting seat 15.
The working principle of the embodiment is as follows: through the support frame 12 that the multiunit is splayed interval setting to and press from both sides tight elastic layer both sides and be the tight wheel 14 that presss from both sides that the contained angle set up with the elastic layer direction of delivery, can produce the traction force of outside expanding to the in-process that the elastic layer was carried, thereby can realize the expanding operation to the elastic layer.
Example 3:
referring to fig. 5, a longitudinal elastic composite nonwoven fabric production device is based on example 1, and is characterized by the difference from example 1: a netting component is arranged on one side of the upstream of the conveying roller 2, the netting component comprises an elastic layer receiving device 17 which is arranged in a rotating mode, a melt-blowing die head 18 is arranged above the elastic layer receiving device 17, and a first auxiliary roller 19 is arranged on one side of the downstream of the elastic layer receiving device 17 in a rotating mode. Wherein the elastic layer receiving means 17 is preferably a suction drum under negative pressure, which is prior art and the principle of which will not be described in detail here. The contact area between the elastic layer and the elastic layer receiving member can be effectively increased by the first auxiliary roller 19, and stable cooling molding of the elastic layer is ensured.
In another embodiment, the receiving layer unwinding roller 20 is disposed on the upstream side of the elastic layer receiving device 17, wherein the receiving layer may be a non-woven fabric with good stretching rate, and the second auxiliary roller 21 is further rotatably disposed on the upstream side of the elastic layer receiving device 17, wherein the auxiliary pressing roller can ensure that the receiving layer is stably attached to the elastic layer receiving device 17, and simultaneously effectively ensure that the elastic limiting of the meltblown die head 18 is stably and uniformly received.
The working principle of the embodiment is as follows: utilize the net formation subassembly directly to produce the elastic layer, later get into the longitudinal stretching operation of elastic layer, further make things convenient for the full flow production to elasticity composite nonwoven, improve the convenience that the device used.
The above, only be the utility model discloses the embodiment of preferred does not restrict according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (10)
1. The utility model provides a compound non-woven fabric apparatus for producing of vertical elasticity which characterized in that: the device comprises an elastic layer conveying assembly, a longitudinal stretching assembly, a width expanding assembly, a composite layer feeding assembly, a composite assembly and a winding assembly which are sequentially arranged;
the elastic layer conveying assembly comprises two conveying rollers (2) which are arranged in a rotating mode in opposite directions and used for conveying the elastic layer at a constant speed;
the longitudinal stretching assembly comprises a plurality of stretching rollers (3) which are arranged at intervals, the speed of each stretching roller (3) is adjustable, and the speed of the stretching roller (3) positioned on the conveying upstream side of the elastic layer is lower than that of the stretching roller (3) positioned on the conveying downstream side of the elastic layer;
a spreader assembly including a spreader roller set for transversely spreading the elastic layer;
the composite layer feeding assembly comprises a composite layer unwinding roller (6) for unwinding the composite layer and a composite layer cloth guide roller (7) for conveying the composite layer at a constant speed;
the composite component comprises two consolidation devices (8) which are symmetrically arranged on the two sides of the upstream and downstream of the non-woven fabric after the elastic layer and the composite layer are combined;
the winding assembly comprises two traction rollers (9) which are arranged on one side of the downstream of the composite assembly in a rotating mode in opposite directions and rotate at the same speed as the last-stage stretching roller (3), and a winding roller (10) is arranged on one side of the downstream of the traction rollers (9) in a rotating mode.
2. The apparatus for producing a longitudinally elastic composite nonwoven fabric according to claim 1, wherein: the expanding roller group is provided with a plurality of spiral rollers (5) with bidirectional expanding spirals on the roller surface, and each spiral roller (5) is arranged at an S-shaped interval.
3. The apparatus for producing a longitudinally elastic composite nonwoven fabric according to claim 1, wherein: the expanding assembly further comprises an expanding frame (11), a plurality of groups of support frames (12) are arranged on the expanding frame (11) at intervals, each support frame (12) is arranged on the expanding frame (11) at intervals in a splayed shape, and the two support frames (12) are correspondingly arranged on two sides of the elastic layer in the width direction respectively, wherein each expanding roller group comprises two clamping wheels (14) which are arranged on the support frames (12) in an opposite rotating mode and are in abutting fit with the elastic layer; wherein the axial direction of each clamping wheel (14) forms an included angle with the conveying direction of the elastic layer.
4. The apparatus for producing a longitudinally elastic composite nonwoven fabric according to claim 3, wherein: the supporting frame (12) is arranged on the expanding frame (11) in a sliding mode, and the expanding frame (11) is rotatably provided with an adjusting screw rod (13) in threaded connection with the supporting frame (12).
5. The apparatus for producing a longitudinally elastic composite nonwoven fabric according to claim 3, wherein: the lifting device is characterized in that a lifting seat (15) is arranged on the support frame (12) in a sliding mode, the clamping wheel (14) located on the upper side is rotatably arranged on the lifting seat (15), and a lifting screw (16) in threaded connection with the support frame (12) is rotatably arranged on the lifting seat (15).
6. The apparatus for producing a longitudinally elastic composite nonwoven fabric according to claim 1, wherein: the consolidation device (8) is a hot-pressing gluing roller or an ultrasonic welding device.
7. The apparatus for producing a longitudinally elastic composite nonwoven fabric according to claim 1, wherein: each stretching roller (3) is arranged at an S-shaped interval, and a pressing roller (4) with a rotating speed corresponding to the stretching roller (3) is arranged at the position of each stretching roller (3) in an abutting mode.
8. The apparatus for producing a longitudinally elastic composite nonwoven fabric according to claim 1, wherein: and an elastic layer unwinding roller (1) is further rotatably arranged on one side of the upstream of the two conveying rollers (2).
9. The apparatus for producing a longitudinally elastic composite nonwoven fabric according to claim 1, wherein: a net forming assembly is arranged on one side of the upstream of the conveying roller (2), the net forming assembly comprises an elastic layer receiving device (17) which is arranged in a rotating mode, a melt-blowing die head (18) is arranged above the elastic layer receiving device (17), and a first auxiliary roller (19) is arranged on one side of the downstream of the elastic layer receiving device (17) in a rotating mode.
10. The apparatus for producing a longitudinally elastic composite nonwoven fabric according to claim 9, wherein: elastic layer receiving arrangement (17) upstream one side is provided with accepts the layer and unreels roller (20), elastic layer receiving arrangement (17) upstream one side still rotates and is provided with second auxiliary roller (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222468398.4U CN218024507U (en) | 2022-09-15 | 2022-09-15 | Longitudinal elastic composite non-woven fabric production device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222468398.4U CN218024507U (en) | 2022-09-15 | 2022-09-15 | Longitudinal elastic composite non-woven fabric production device |
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| Publication Number | Publication Date |
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| CN218024507U true CN218024507U (en) | 2022-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222468398.4U Active CN218024507U (en) | 2022-09-15 | 2022-09-15 | Longitudinal elastic composite non-woven fabric production device |
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| CN (1) | CN218024507U (en) |
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- 2022-09-15 CN CN202222468398.4U patent/CN218024507U/en active Active
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