CN215351726U - Rotating structure of fire extinguishing fluid conveying device and fire fighting truck - Google Patents
Rotating structure of fire extinguishing fluid conveying device and fire fighting truck Download PDFInfo
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- CN215351726U CN215351726U CN202121440423.7U CN202121440423U CN215351726U CN 215351726 U CN215351726 U CN 215351726U CN 202121440423 U CN202121440423 U CN 202121440423U CN 215351726 U CN215351726 U CN 215351726U
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- telescopic arm
- rotating shaft
- pipe body
- rotating
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Abstract
The utility model discloses a rotating structure of a fire extinguishing fluid conveying device and a fire engine, wherein a rotating shaft is hollow, water inlets are arranged at two ends of the rotating shaft and are used for being connected with a water inlet pipe, a first pipe body is rotatably sleeved on the rotating shaft, a plurality of first through holes are arranged on the side wall of the rotating shaft and are arranged along the circumferential direction of the rotating shaft, two end parts of the first pipe body are rotatably and hermetically connected with the side wall of the rotating shaft, the first through holes are arranged between the rotatable and hermetically connected parts at the two ends, and a second through hole is arranged on the side wall of the first pipe body. Through the arrangement of the first through hole, the second through hole, the rotating shaft and the first pipe body, the rotating shaft of the arm support of the fire fighting truck realizes the water inlet function while realizing the rotation of the arm support, and the space utilization rate on the fire fighting truck is improved.
Description
Technical Field
The utility model relates to the technical field of fire fighting, in particular to a rotating structure of a fire extinguishing fluid conveying device and a fire fighting truck.
Background
In the prior art, a folding fire extinguishing vehicle is adopted under the fire extinguishing condition of a high-rise building, and the folding fire extinguishing vehicle needs a larger high-altitude operation space. When the foldable fire extinguishing vehicle is used, the four fixing supports at the bottom need to be extended out, and after the fixing supports are fixed, the folding and the expansion are started; when folding, need earlier to fold the arm and expand, will put out a fire the mechanism and reach appointed position of putting out a fire again, begin the infusion and put out a fire.
In the prior art, the following disadvantages exist:
1) when the folding arm is unfolded in the air, a large unfolding space is needed, and when shelters such as lines and pipelines exist at the high altitude between fire buildings, the unfolding of the folding arm is not facilitated, and the operation in a lane and a narrow space is not facilitated.
2) The folding arm type high-lift fire truck has heavy weight due to the structure, and has high requirement on the ground bearing capacity for vehicles with larger lifting height due to overlarge weight of the whole truck.
3) The mechanism is complicated, and the failure rate is high.
SUMMERY OF THE UTILITY MODEL
Therefore, it is desirable to provide a rotating structure of a fire extinguishing fluid conveying device and a fire fighting truck, which can improve the space utilization rate of the fire fighting truck.
To achieve the above object, the present application provides a rotating structure of a fire extinguishing fluid transporting device, comprising: the device comprises a rotating shaft, a first pipe body and a second pipe body; the rotating shaft is hollow, water inlets are formed in two ends of the rotating shaft and are used for being connected with a water inlet pipe, the first pipe body is rotatably sleeved on the rotating shaft, one or more first through holes are formed in the side wall of the rotating shaft and are arranged along the circumferential direction of the rotating shaft, two end portions of the first pipe body are rotatably and hermetically connected with the side wall of the rotating shaft, the first through holes are formed between the rotatable and hermetically connected positions of the two ends, and second through holes are formed in the side wall of the first pipe body; the second pipe body is communicated with the second through hole of the first pipe body and fixedly connected with the first pipe body; and fire extinguishing fluid in the rotating shaft sequentially flows into the second through hole and the second pipe body through any one or more first through holes.
Further, the novel pipe fitting device further comprises two shaft sleeves, the shaft sleeves are arranged on the rotating shaft in a sleeved mode, the two shaft sleeves are arranged on two sides of the first through hole, and two ends of the first pipe body are respectively arranged on the shaft sleeves in a sleeved mode.
Further, still include two sealing washers, two the sealing washer cover is established on the rotation axis, the both ends of first body are arranged in on the sealing washer, rotatable sealing connection is realized to the sealing washer.
Further, a hollow interlayer is arranged between the first pipe body above the first through hole and the rotating shaft, the hollow interlayer surrounds the rotating shaft, and the hollow interlayer is arranged on the first through hole.
Furthermore, the telescopic device also comprises a multi-stage telescopic arm, and the second pipe body is a telescopic pipe body; the multi-stage telescopic arm is used for driving the second pipe body to stretch, and one end of the multi-stage telescopic arm is fixedly connected with the outer side wall of the first pipe body.
Further, the multi-stage telescopic arm includes: the telescopic arm comprises a first-stage telescopic arm, a second-stage telescopic arm and a driving mechanism, wherein the first-stage telescopic arm and the second-stage telescopic arm are nested in a sliding mode; the telescopic arm of second level for the wall of the telescopic arm of first level is provided with the screw thread, be provided with actuating mechanism on the telescopic arm of first level, actuating mechanism arranges in telescopic arm one side of first level, just actuating mechanism is used for the drive telescopic arm of second level for the telescopic arm of first level takes place axial relative motion.
Further, the driving mechanism comprises a rotating body and a connecting assembly, the rotating body is provided with threads, the threads of the rotating body are force transmission screws, the threads of the second-stage telescopic arm are matched with the threads of the rotating body, the connecting assembly is used for fixing the rotating body and the first-stage telescopic arm in an axial direction, and the rotating body can rotate around the rotation center of the rotating body;
wherein the rotator is configured such that when the rotator rotates about its own rotation center, the thread of the rotator engages with the thread of the second stage telescopic arm, and an axial driving force is applied to the second stage telescopic arm by the engagement of the threads with each other, so that the second stage telescopic arm is axially moved relative to the first stage telescopic arm.
Further, the driving mechanism further includes: a power source for driving the rotating body to rotate about its own rotation center;
the power supply is rotatory worm wheel and worm, the worm sets up one side of rotatory worm wheel, rotatory worm wheel with rotator fixed connection, the worm with rotatory worm wheel meshes mutually.
Further, still include: and the two ends of the first pipe body are arranged on the slewing mechanism, and the slewing mechanism is used for rotating or moving the first pipe body, the second pipe body and the rotating shaft.
In order to achieve the above object, the present application provides a fire fighting truck to which the rotating structure of the fire fighting fluid transfer device according to any one of the above embodiments is applied.
Be different from prior art, above-mentioned technical scheme, through the setting of first through-hole, second through-hole, rotation axis and first body makes fire engine cantilever crane pivot realize the function of intaking when realizing that the cantilever crane is rotatory, improves space utilization on the fire engine.
Drawings
Fig. 1 is a structural view of the rotating shaft, the first pipe and the second pipe;
FIG. 2 is an enlarged view of FIG. 1 at B;
FIG. 3 is a schematic view of the first tubular body and the swivel mechanism;
fig. 4 is a view showing the construction of the rotating shaft;
FIG. 5 is a cross-sectional view of the second tubular body;
FIG. 6 is an enlarged view taken at A in FIG. 5;
FIG. 7 is a view of the first stage telescopic boom, the second stage telescopic boom and the driving mechanism;
fig. 8 is a structural view of the fire fighting truck.
Description of reference numerals:
1. a rotating shaft;
11. a first through hole;
2. a first pipe body;
21. a second through hole;
22. a shaft sleeve;
23. a seal ring;
24. a hollow interlayer;
3. a second tube body;
31. a first stage telescopic boom;
32. a second stage telescopic arm;
33. a drive mechanism;
4. a slewing mechanism.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1 to 8, in the present embodiment, the rotating structure of the fire extinguishing fluid delivering device includes: a rotating shaft 1, a first pipe 2 and a second pipe 3; the rotating shaft 1 is hollow, water inlets are formed in two ends of the rotating shaft and are used for being connected with a water inlet pipe, the first pipe body 2 is rotatably sleeved on the rotating shaft 1, one or more first through holes 11 are formed in the side wall of the rotating shaft 1, the one or more first through holes 11 are formed in the circumferential direction of the rotating shaft 1, two end portions (the two end portions can be pipe body portions with certain lengths at two ends, the pipe body portions can be rotatably and hermetically connected with the rotating shaft through the pipe body portions, the pipe body portions are not limited at the end heads of the two ends) of the first pipe body 2 and are rotatably and hermetically connected with the side wall of the rotating shaft, the first through holes are formed between the rotatably and hermetically connected positions of the two ends, a second through hole is formed in the side wall of the first pipe body 2, and the second through hole 21 in the first pipe body 2 is arranged on the first through hole 11; the second pipe body 3 is communicated with the second through hole 21 of the first pipe body 2, and the second pipe body is fixedly connected with the first pipe body; the fire extinguishing fluid in the rotating shaft 1 flows through any one or more of the first through holes 11 to the second through hole 21 and the second pipe body 3 in sequence. It should be noted that the second through hole 21 is a water outlet through hole, and the number of the second through holes 21 is one, and the second through hole 21 is used for discharging fire extinguishing fluid; a plurality of the first through holes 11 are disposed in the middle of the rotating shaft 1, and fire extinguishing fluid flows from both ends of the rotating shaft 1 toward the middle of the rotating body. Since the first pipe 2 completely covers the plurality of first through holes 11, the fire extinguishing fluid in the rotary shaft 1 can be discharged only through the first through holes 11. The second through hole 21 corresponds to the first through hole 11, wherein when the second through hole 21 coincides with the first through hole 11, the fire extinguishing fluid in the rotating shaft 1 flows into the second pipe body 3 through the first through hole 11 and the second through hole 21.
It should be further noted that the first through hole 11 is disposed along the circumferential direction of the rotating shaft 1, and a plurality of the first through holes 11 are disposed around the rotating shaft 1; the second through hole 21 is disposed on the first tube 2, and when the first tube 2 is sleeved on the rotating shaft 1, the second through hole 21 corresponds to the first through hole 11, that is, the second through hole 21 moves on the first through hole 11; specifically, when the first pipe body 2 rotates to any position, the first through hole 11 and the second through hole 21 are arranged in a communicating manner; the fire extinguishing fluid can enter the second through hole 21 through the first through hole 11 when the first pipe body 2 rotates to any position.
It should be noted that, in the present embodiment, there is no gap between the first pipe 2 and the rotating shaft 1, that is, only a part of the first through holes 11 can discharge the fire extinguishing fluid in use; specifically, since the first through holes 11 are arranged along the circumferential direction of the rotating shaft 1, when the second through holes 21 are disposed on the first through holes 11, the first through holes 11 having the second through holes 21 thereon can discharge fire extinguishing fluid, and the rest of the first through holes 11 are blocked by the inner wall of the first pipe body 2.
During the in-service use, fire extinguishing fluid enters into from the end of intaking at rotation axis 1 both ends in rotation axis 1, fire extinguishing fluid along rotation axis 1 removes to rotation axis 1 middle part, through part first through-hole 11 enters into in the second through-hole 21, fire extinguishing fluid again through the second through-hole 21 enters into in the second body 3. In the technical scheme, the first through hole 11, the second through hole 21, the rotating shaft 1 and the first pipe body 2 are arranged, so that the rotating shaft of the arm support of the fire truck realizes the water inlet function while realizing the rotation of the arm support, and the space utilization rate on the fire truck is improved.
Referring to fig. 2, in this embodiment, in order to reduce friction between the inner wall of the first tube 2 and the rotating shaft 1, the first tube further includes two shaft sleeves 22, the shaft sleeves 22 are sleeved on the rotating shaft 1, the two shaft sleeves 22 are disposed at two sides of the first through hole 11, and two ends of the first tube 2 are respectively sleeved on the shaft sleeves 22. It should be noted that the shaft sleeve 22 is disposed between the first tube 2 and the rotating body, a first groove adapted to the shaft sleeve 22 is further disposed on the inner wall of the first tube 2, and the shaft sleeve 22 is disposed in the first groove. The arm support is arranged on the first pipe body 2, and when the arm support on the first pipe body 2 rotates, the shaft sleeve 22 is used for supporting the arm support and reducing the abrasion between the rotating shaft 1 and the first pipe body 2; it should also be noted that the sleeve 22 is a self-lubricating sleeve 22.
Referring to fig. 3, in this embodiment, in order to improve the sealing performance between the inner wall of the first pipe body 2 and the rotating shaft 1, two sealing rings 23 (may be O-shaped sealing rings) are further included, the two sealing rings 23 are sleeved on the rotating shaft 1, two ends of the first pipe body 2 are disposed on the sealing rings 23, and the sealing rings 23 are rotatably and sealingly connected. It should be noted that, still be provided with on the inner wall of first body 2 with sealing washer 23 looks adaptation second recess, sealing washer 23 is arranged in the second recess, just first body 2 inner wall with the outer wall of rotation axis 1 passes through sealing washer 23 interference fit. Specifically, the sealing ring 23 is disposed between the rotating shaft 1 and the first pipe 2, so that the rotating shaft 1 and the first pipe 2 are tightly connected to prevent the fire extinguishing fluid from flowing out of a gap between the first pipe 2 and the rotating shaft 1.
Referring to fig. 6, in order to uniformly spray the fire extinguishing fluid from the second pipe 3, in some embodiments, a hollow interlayer 24 is disposed between the first pipe above the first through hole 11 and the rotating shaft 1, the hollow interlayer 24 surrounds the rotating shaft 1, and the hollow interlayer 24 is disposed on the plurality of first through holes 11. It should be noted that the hollow interlayer 24 is arranged to allow the fire extinguishing fluid to flow out of each of the first through holes 11. Meanwhile, the hollow interlayer 24 can ensure the outflow of the fire extinguishing fluid when the second through hole 21 is not completely overlapped with the first through hole 11. It should be further noted that the hollow interlayer 24 is in communication with each of the first through holes 11, and the hollow interlayer 24 is in communication with the second through hole 21. Specifically, fire extinguishing fluid enters the rotating shaft 1 from water inlets at two ends of the rotating shaft 1, enters the hollow interlayer 24 from all the first through holes 11, and then enters the second pipe body 3 through the second through holes 21.
In practical use, when the first pipe body 2 is rotated to any position, the fire extinguishing fluid can flow out of each first through hole 11 and enter the hollow interlayer 24; the extinguishing fluid then passes through the hollow interlayer 24 from the second through hole 21 on the side of the first tube 2 into the second tube 3. In this embodiment, the first through hole 11, the second through hole 21, the hollow interlayer 24, the rotating shaft 1 and the first pipe 2 are arranged to allow the fire fighting truck to stably spray the fire fighting fluid, thereby preventing the flow rate difference of the fire fighting fluid sprayed per unit time from being too large when the second pipe 3 sprays the fire fighting fluid.
Referring to fig. 1 and 3, in some embodiments, the first tube 2 and the second tube 3 are perpendicular to each other. It should be noted that, in this embodiment, the first pipe body 2 is sleeved on the rotating shaft 1, and the rotating shaft 1 is also perpendicular to the second pipe body 3. The second pipe 3 is vertically arranged, so that the second pipe 3 can be prevented from being laterally tilted and damaged, and the bearing capacity of the first pipe 2 and the rotating shaft 1 can be improved.
Referring to fig. 1, 3 and 8, in some implementations, the method further includes: the two ends of the first pipe body 2 are rotatably arranged on the swing mechanism 4, and the swing mechanism 4 is used for rotating or moving the first pipe body 2, the second pipe body 3 and the rotating shaft 1. The swing mechanism 4 comprises a swing mechanism 4 body and supports, the supports are fixedly arranged on the bottom plate body, two ends of the rotating shaft 1 are fixed on the supports, and the first pipe body 2 is rotatably arranged between the supports.
Referring to fig. 5 and 7, in some embodiments, the device further includes a multi-stage telescopic arm, and the second tube 3 is a telescopic tube; the multi-stage telescopic arm is used for driving the second pipe body to stretch, and one end of the multi-stage telescopic arm is fixedly connected with the outer side wall of the first pipe body.
Wherein, the multistage telescopic arm includes: the telescopic arm comprises a first-stage telescopic arm 31, a second-stage telescopic arm 32 and a driving mechanism 33, wherein the first-stage telescopic arm 31 and the second-stage telescopic arm 32 are nested in a sliding mode; the flexible arm 32 of second level for the wall of the flexible arm 31 of first level is provided with the screw thread, be provided with actuating mechanism 33 on the flexible arm 31 of first level, actuating mechanism 33 arranges in the flexible arm 31 one side of first level, just actuating mechanism 33 is used for the drive the flexible arm 32 of second level for the flexible arm 31 of first level takes place axial relative motion. Of course, in certain embodiments, the telescopic arms of the multi-stage telescopic arm are multi-stage. It should be noted that the driving mechanism 33 is disposed on the first-stage telescopic arm 31, and an output end of the driving mechanism 33 is in transmission connection with the second-stage telescopic arm 32, that is, the driving mechanism 33 drives the second-stage telescopic arm 32 to rotate and drives the second-stage telescopic arm to extend out of the first-stage telescopic arm 31.
Referring to fig. 5, in some embodiments, the driving mechanism 33 includes a rotating body and a connecting assembly, the rotating body is provided with a thread, the thread of the rotating body is a force transmission screw, the thread of the second stage telescopic arm 32 is matched with the thread of the rotating body, the connecting assembly is used for fixing the rotating body and the first stage telescopic arm 31 in an axial direction, and the rotating body can rotate around its own rotation center; wherein the rotary body is configured such that when the rotary body rotates about its own rotation center, the screw thread of the rotary body makes an engagement motion with the screw thread of the second stage telescopic arm 32, and an axial driving force is applied to the second stage telescopic arm 32 by the screw engagement motion with each other, so that the second stage telescopic arm 32 is relatively moved in the axial direction with respect to the first stage telescopic arm 31. It should be noted that the thread on the rotator is engaged with the external thread of the second stage telescopic arm 32, the rotator is rotatably fixed on one side of the second stage telescopic arm, and the rotator rotates around its own axis, so as to drive the second stage telescopic arm 32 to extend and retract. The drive mechanism 33 further includes: a power source for driving the rotating body to rotate about its own rotation center; the power supply is rotatory worm wheel and worm, the worm sets up one side of rotatory worm wheel, rotatory worm wheel with rotator fixed connection, the worm with rotatory worm wheel meshes mutually.
In this embodiment, the use process of the driving mechanism 33 is as follows: the power source is started, the power source drives the worm to rotate, the worm drives the rotary worm wheel to rotate, and the rotary worm wheel drives the rotary body to rotate, so that the second-stage telescopic arm 32 stretches in the first-stage telescopic arm 31, and then the liquid is infused in the first-stage telescopic arm 31, and therefore fire is extinguished to a fire point. After the fire extinguishing is finished, the worm is driven to rotate through the power source, the second pipe body is retracted, and the operation is finished. The power source also comprises a hydraulic motor, a pneumatic motor or an electric motor; the scroll bar is powered by any one of a hydraulic motor, a pneumatic motor or an electric motor.
In this embodiment, have multistage body in the fire engine, this application uses two bodys as the example, it needs to explain that the flexible arm of first order is the outer tube, and the flexible arm of second level is the inner tube, and the outer pipe box is established on the inner tube.
It should be noted that, although the above embodiments have been described herein, the utility model is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (10)
1. A rotating structure of a fire suppression fluid delivery device, comprising: the device comprises a rotating shaft, a first pipe body and a second pipe body;
the rotating shaft is hollow, water inlets are formed in two ends of the rotating shaft and are used for being connected with a water inlet pipe, the first pipe body is rotatably sleeved on the rotating shaft, one or more first through holes are formed in the side wall of the rotating shaft and are arranged along the circumferential direction of the rotating shaft, two end portions of the first pipe body are rotatably and hermetically connected with the side wall of the rotating shaft, and the first through holes are formed between the rotatable and hermetically connected positions of the two ends;
a second through hole is formed in the side wall of the first pipe body; the second pipe body is communicated with the second through hole and fixedly connected with the first pipe body; and fire extinguishing fluid in the rotating shaft sequentially flows into the second through hole and the second pipe body through any one or more first through holes.
2. The rotating structure of the fire extinguishing fluid conveying device according to claim 1, further comprising two shaft sleeves, wherein the two shaft sleeves are respectively sleeved on the rotating shaft, the two shaft sleeves are arranged on two sides of the first through hole, and two ends of the first pipe body are respectively sleeved on the shaft sleeves.
3. The rotating structure of a fire extinguishing fluid conveying device according to claim 1, further comprising two sealing rings, wherein the two sealing rings are respectively sleeved on the rotating shaft, two ends of the first pipe body are arranged on the sealing rings, and the sealing rings are connected in a rotatable and sealed manner.
4. The rotating structure of fire extinguishing fluid transporting device according to claim 1, wherein a hollow interlayer is provided between the first pipe body above the first through hole and the rotating shaft, the hollow interlayer surrounds the rotating shaft, and the hollow interlayer is disposed on the first through hole.
5. The rotating structure of fire fighting fluid delivery device according to claim 1, further comprising a multi-stage telescopic boom, wherein said second tube is a telescopic tube; the multi-stage telescopic arm is used for driving the second pipe body to stretch, and one end of the multi-stage telescopic arm is fixedly connected with the outer side wall of the first pipe body.
6. The rotating structure of fire fighting fluid delivery device according to claim 5, wherein said multi-stage telescopic boom comprises: the telescopic arm comprises a first-stage telescopic arm, a second-stage telescopic arm and a driving mechanism, wherein the first-stage telescopic arm and the second-stage telescopic arm are nested in a sliding mode; the telescopic arm of second level for the wall of the telescopic arm of first level is provided with the screw thread, be provided with actuating mechanism on the telescopic arm of first level, actuating mechanism arranges in telescopic arm one side of first level, just actuating mechanism is used for the drive telescopic arm of second level for the telescopic arm of first level takes place axial relative motion.
7. The rotating structure of fire extinguishing fluid conveying device according to claim 6, wherein the driving mechanism comprises a rotating body provided with threads, the threads of the rotating body are force transmission screws, the threads of the second stage telescopic arm are matched with the threads of the rotating body, and a connecting assembly is used for fixing the rotating body and the first stage telescopic arm in an axial direction, and the rotating body can rotate around the rotation center of the rotating body;
wherein the rotator is configured such that when the rotator rotates about its own rotation center, the thread of the rotator engages with the thread of the second stage telescopic arm, and an axial driving force is applied to the second stage telescopic arm by the engagement of the threads with each other, so that the second stage telescopic arm is axially moved relative to the first stage telescopic arm.
8. The rotating structure of fire suppression fluid delivery device of claim 7, wherein the drive mechanism further comprises: a power source for driving the rotating body to rotate about its own rotation center;
the power supply is rotatory worm wheel and worm, the worm sets up one side of rotatory worm wheel, rotatory worm wheel with rotator fixed connection, the worm with rotatory worm wheel meshes mutually.
9. The rotating structure of fire suppression fluid delivery device of claim 1, further comprising: and the two ends of the first pipe body are arranged on the slewing mechanism, and the slewing mechanism is used for rotating or moving the first pipe body, the second pipe body and the rotating shaft.
10. A fire fighting truck is characterized by comprising a truck chassis, a truck body and
a rotary structure of the fluid transfer device according to any one of claims 1 to 9;
the vehicle body is arranged on the vehicle chassis, and the vehicle chassis is used for providing power for the fire fighting truck;
the rotating structure of the fluid conveying device is arranged on the vehicle body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121440423.7U CN215351726U (en) | 2021-06-28 | 2021-06-28 | Rotating structure of fire extinguishing fluid conveying device and fire fighting truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121440423.7U CN215351726U (en) | 2021-06-28 | 2021-06-28 | Rotating structure of fire extinguishing fluid conveying device and fire fighting truck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215351726U true CN215351726U (en) | 2021-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121440423.7U Active CN215351726U (en) | 2021-06-28 | 2021-06-28 | Rotating structure of fire extinguishing fluid conveying device and fire fighting truck |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215351726U (en) |
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2021
- 2021-06-28 CN CN202121440423.7U patent/CN215351726U/en active Active
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