CN216866693U - Main drive of normal pressure type cutter head tunneling machine and normal pressure type cutter head tunneling machine - Google Patents

Main drive of normal pressure type cutter head tunneling machine and normal pressure type cutter head tunneling machine Download PDF

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Publication number
CN216866693U
CN216866693U CN202123257777.0U CN202123257777U CN216866693U CN 216866693 U CN216866693 U CN 216866693U CN 202123257777 U CN202123257777 U CN 202123257777U CN 216866693 U CN216866693 U CN 216866693U
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main drive
normal pressure
central
drive
pressure type
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张伟强
徐纯杰
石鑫
顾永升
卓庆敏
徐淼
叶超
张鹏豪
庞文卓
廖兆锦
李俊志
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China Railway Engineering Equipment Group Co Ltd CREG
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China Railway Engineering Equipment Group Co Ltd CREG
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Abstract

The utility model belongs to the field of tunneling equipment, and particularly relates to a main drive of a normal pressure type cutter head tunneling machine and the normal pressure type cutter head tunneling machine, wherein the normal pressure type cutter head tunneling machine comprises a shield body and a main drive arranged in the shield body, the main drive comprises a drive box body, the middle part of the drive box body is a central channel which is communicated from front to back, the main drive of the normal pressure type cutter head tunneling machine also comprises a drive device which is fixed relative to the drive box, the rear end of the part of the drive device which forms the central channel is hermetically connected with a seal plate, the seal plate seals the rear end of the central channel to form a central cabin, the central part of the seal plate is provided with a central rotary joint mounting hole for mounting a central rotary joint, and the central cabin is integrated on the main drive by the structure, the radial size of the main drive can be further miniaturized while the radial size of the center cabin is ensured, and further the heading machine can be further miniaturized.

Description

Main drive of normal pressure type cutter head tunneling machine and normal pressure type cutter head tunneling machine
Technical Field
The utility model belongs to the field of tunneling equipment, and particularly relates to a main drive of a normal pressure type cutter head tunneling machine and the normal pressure type cutter head tunneling machine.
Background
For the tunneling machine with the cutter head being a normal-pressure cutter head, the central cabin can be arranged to perform transition between the cutter cabin and the shuttle cabin, so that workers are prevented from directly entering the cutter head through the shuttle cabin, and the protection of the workers is realized.
The novel cutter conveying system and the conveying method thereof are disclosed in Chinese patent with application publication number CN110159287A and application publication date of 2019, 08 and 23, and relate to a main drive of a heading machine, wherein a central cabin is arranged on the main drive of the main drive, specifically, a central cabin shell is fixed on a main drive box body, the central cabin shell comprises a cylindrical section and a curved surface bottom which is positioned at the tail end of the cylindrical section and protrudes backwards in the middle, and the central cabin shell is fixed with a drive box body through the cylindrical section. The center cabin shell is used as a mounting base body of the center rotary joint, specifically, a center rotary joint mounting hole is formed in the center of the center cabin shell, the center rotary joint is mounted in the center rotary joint mounting hole, and the rear end of the center rotary joint is connected with a liquid supply pipeline through an elbow structure. In order to transport the materials, a material transporting system is further arranged in a shield body of the heading machine and comprises a telescopic platform located on the rear side of the central cabin, and when the materials are transported, the materials are placed on the telescopic platform and are conveyed to the central cabin through the telescopic platform. For the fixing mode of the central cabin shell on the driving box body, a flange structure is mostly adopted for fixing in the prior art, for example, a shield tunneling machine normal pressure cutterhead central cabin structure disclosed by the Chinese patent with the application publication number of CN107130971A and the application publication date of 2017, 09 and 05, specifically, in order to install the central cabin shell, an inward turning edge is arranged on the inner wall of the part of the driving box body surrounding the central channel to form the flange structure, correspondingly, an outward turning edge is arranged at the front end of the cylindrical section of the central cabin shell to form the outer flange structure, and the central cabin shell is fixed on a main drive through the matching of a bolt nut component and the flange structure.
The installation mode of the center cabin shell and the center cabin shell with the structure enables the inner diameter of the main driving center channel to be larger than the maximum radial dimension of the inner cavity of the center cabin shell, and the inner diameter of the inner cavity of the center cabin shell needs to be the minimum dimension due to the fact that the material transferring path passes through the inner cavity of the center cabin shell when materials are transferred to the position of the cutter head, and the inner diameter of the main driving center channel is larger than the minimum dimension, so that the miniaturization of the main driving radial dimension is restricted, and the miniaturization of the radial dimension of the heading machine is restricted. In addition, the center cabin shell protrudes backwards for a long distance relative to the driving box body, so that the distance between the elbow structure at the rear side of the center swivel joint and the telescopic platform in the front-rear direction is short, and the operation of an operator at the position is inconvenient.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a main drive of a normal pressure type cutter head tunneling machine, which aims to solve the technical problem that the normal pressure type cutter head tunneling machine in the prior art is limited in radial miniaturization because the inner diameter of a part of a central channel surrounded by a driving box body is larger than the maximum radial size of an inner cavity of a central cabin shell; the utility model also aims to provide a normal pressure type cutterhead tunneling machine which is mainly driven by the normal pressure type cutterhead tunneling machine.
In order to achieve the purpose, the main drive technical scheme of the normal pressure type cutter head tunneling machine provided by the utility model is as follows:
the utility model provides a normal pressure formula blade disc entry driving machine main drive, includes the drive box, the central channel that link up around drive box middle part is, normal pressure formula blade disc entry driving machine main drive still include for the fixed drive arrangement of drive box, drive arrangement are used for providing power for the rotation that corresponds the blade disc, characterized by, enclose of drive box have the partial rear end sealing connection of central channel has the shrouding, the shrouding shutoff the rear end of central channel is in order to enclose out central cabin, the central position of shrouding is seted up and is had the center rotary joint mounting hole that is used for installing central rotary joint.
The beneficial effects are that: therefore, the central channel of the main drive is utilized to form the tail end part of the central cabin, the central cabin is integrated on the main drive, and compared with a central cabin shell which is nested in the main drive and protrudes backwards, the central cabin with the diameter smaller than that of the central channel of the main drive is formed by an inner cavity formed by the central cabin shell, the central cabin and the main drive are integrally arranged, so that the inner diameter of the central channel of the main drive is consistent with the radial dimension of the central cabin at a corresponding position.
As a further improvement, the sealing plate is located at the position of the speed reducer of the driving device, the diameter of the sealing plate is larger than that of the central channel, and the sealing plate is provided with speed reducer mounting holes for mounting the speed reducer.
The beneficial effects are that: so make and drive the plate structure that the box encloses out the center compartment and be used for installing the plate structure integrated into one piece of speed reducer, need not additionally to this two part plate structures manufacturing respectively, reduce the part machining work load in the main drive manufacturing process, improve the convenience that the main drive was made.
As a further improvement, the sealing plate is a flat plate or a curved plate with the middle part recessed into the central channel.
The beneficial effects are that: the shrouding adopts dull and stereotyped structure or middle part to the sunken plate structure in the central passage, with the installation position antedisplacement of center rotary joint as far as possible for center rotary joint and the elbow structure that center rotary joint rear side links move forward, realize the maximize in main drive rear side space, and the operating personnel of being convenient for here carries out the operation.
As a further improvement, the sealing plate is fixed to the portion of the drive case enclosing the central passage by a welded connection.
The beneficial effects are that: compared with bolt connection, the sealing plate can be connected to the driving box body of the main drive more simply and conveniently by adopting a welding mode, and meanwhile, the sealing performance of the central cabin can be effectively guaranteed by the fixed connection structure.
As a further improvement, the sealing plate is a flat plate, and reinforcing ribs are fixedly connected between the edge of the sealing plate of the flat plate structure and the inner wall of the central channel.
The beneficial effects are that: the shrouding adopts dull and stereotyped structure to make the shrouding be convenient for manufacture and transportation, meanwhile, sets up the shrouding that the strengthening rib can guarantee dull and stereotyped structure and have qualified compressive strength, and then ensures that the centre cabin has reliable bearing capacity.
As a further improvement, the reinforcing ribs are connected with the inner plate surface of the sealing plate.
The beneficial effects are that: because the shrouding outside will carry out the installation of corresponding components and parts and pipeline, set up the strengthening rib and can prevent that the setting of strengthening rib from causing the influence to operating personnel's installation operation on the inboard face of shrouding.
In order to achieve the purpose, the technical scheme of the normal pressure type cutterhead tunneling machine provided by the utility model is as follows:
the utility model provides a normal pressure formula blade disc entry driving machine, includes the shield body and sets up the main drive in the shield body, the main drive includes the drive box, and the center channel that link up around drive box middle part is, normal pressure formula blade disc entry driving machine main drive still include for the fixed drive arrangement of drive box, drive arrangement are used for providing power for the rotation that corresponds the blade disc, characterized by, the enclosure of drive box encloses the partial rear end sealing connection of center channel has the shrouding, the shrouding shutoff the rear end of center channel is in order to enclose out the center cabin, the center part of shrouding is seted up and is had the center rotary joint mounting hole that is used for installation center rotary joint.
The beneficial effects are that: therefore, the central channel of the main drive is utilized to form the tail end part of the central cabin, the central cabin is integrated on the main drive, and compared with a central cabin shell which is nested in the main drive and protrudes backwards, an inner cavity formed by the central cabin shell forms the central cabin with the diameter smaller than that of the central channel of the main drive, the structure which is integrally arranged between the central cabin and the main drive enables the inner diameter of the central channel of the main drive to be consistent with the radial dimension of the central cabin at the corresponding position.
As a further improvement, the sealing plate is located at the position of the speed reducer of the driving device, the diameter of the sealing plate is larger than that of the central channel, and speed reducer mounting holes for mounting the speed reducer are formed in the sealing plate.
The beneficial effects are that: so make and drive the plate structure that the box encloses out the center compartment and be used for installing the plate structure integrated into one piece of speed reducer, need not additionally to this two part plate structures manufacturing respectively, reduce the part machining work load in the main drive manufacturing process, improve the convenience that the main drive was made.
As a further improvement, the sealing plate is a flat plate or a curved plate with the middle part sunken into the central channel.
The beneficial effects are that: the shrouding adopts dull and stereotyped structure or middle part to the sunken plate structure in the central passage, with the installation position antedisplacement of center rotary joint as far as possible for center rotary joint and the elbow structure that center rotary joint rear side links move forward, realize the maximize in main drive rear side space, and the operating personnel of being convenient for here carries out the operation.
As a further improvement, the sealing plate is fixed to the portion of the drive case enclosing the central passage by a welded connection.
The beneficial effects are that: compared with bolt connection, the sealing plate can be connected to the driving box body of the main drive more simply and conveniently by adopting a welding mode, and meanwhile, the sealing performance of the central cabin can be effectively guaranteed by the fixed connection structure.
As a further improvement, the sealing plate is a flat plate, and reinforcing ribs are fixedly connected between the edge of the sealing plate of the flat plate structure and the inner wall of the central channel.
The beneficial effects are that: the shrouding adopts the plate structure to make the shrouding be convenient for manufacture and transportation, meanwhile, sets up the strengthening rib and can guarantee that plate structure's shrouding has qualified compressive strength, and then ensures that the centre deck has reliable bearing capacity.
As a further improvement, the reinforcing ribs are connected with the inner plate surface of the sealing plate.
The beneficial effects are that: because the shrouding outside will carry out the installation of corresponding components and parts and pipeline, set up the strengthening rib and can prevent that the setting of strengthening rib from causing the influence to operating personnel's installation operation on the inboard face of shrouding.
Drawings
Fig. 1 is a schematic structural diagram of the inside of a shield of an embodiment 1 of a normal pressure type cutterhead heading machine according to the present invention;
fig. 2 is a plan view of a shield inner part structure of a normal pressure type cutterhead excavator according to embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a sealing plate of an embodiment 1 of the normal pressure type cutterhead tunneling machine according to the present invention;
description of reference numerals:
1. a shield body; 2. main driving; 3. a cutter head; 4. a central channel; 5. closing the plate; 6. a material channel; 7. a central swivel joint; 8. an inner shield track; 9. a material transfer trolley; 10. bending the pipe; 11. an arc-shaped track; 12 a knife cylinder assembly; 13. a hoisting unit in the shield body; 14. an outer door section; 15. an inner door section; 16. a transition section; 17. a motor; 18. a speed reducer; 19. a central swivel joint mounting hole; 20. contour lines; 21. a speed reducer mounting hole; 22. a central passage wall.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating embodiments of the utility model, are given by way of illustration only, not by way of limitation, i.e., the embodiments described are intended as a selection of the best mode contemplated for carrying out the utility model, not as a full mode. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, which may be present, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …," or the like, does not exclude the inclusion of such elements as a process, method, or the like.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object of "provided" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or a non-detachable connection. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.
The present invention will be described in further detail with reference to examples.
In this embodiment, the structure of the normal pressure type cutterhead heading machine of the present invention is described by taking the heading machine as a normal pressure cutterhead slurry heading machine, the transported material as a cutter barrel assembly 12 consisting of a cutter and a cutter barrel, and the material transfer operation as an example of transporting the material to the cutterhead, which is specifically as follows:
a part of the structure of the normal pressure type cutterhead tunneling machine provided by the embodiment is shown in fig. 1, and includes a shield body 1, a main drive 2 is arranged in the shield body 1, the main drive 2 is provided with a drive box, and a cutterhead 3 is mounted on the main drive 2 through a cutterhead mounting structure. The main drive 2 also has a drive means fixed to the drive housing for driving the cutterhead in rotation, which drive means comprises a motor 17 and a reducer 18 fixed relative to the drive housing, as shown in figure 2. In this embodiment, the cutter 3 is a normal pressure cutter. The middle part of the main drive 2 is a central channel 4, in addition, the part of the drive box body which encloses the central channel 4 is defined as a central channel wall body 22, a sealing plate 5 is welded and sealed on the rear end surface of the central channel wall body 22, and the rear end of the central channel 4 is sealed by the sealing plate 5 so as to enclose the central cabin.
As shown in fig. 3, the closing plate 5 is provided with a material passage 6 and a central rotary joint mounting hole 19, and the central rotary joint 7 is mounted in the central rotary joint mounting hole 19. The material channel 6 is used for feeding materials into and out of the central cabin, and a material channel door (not shown in the figure) is further arranged corresponding to the material channel 6 so as to meet the sealing performance and the pressure resistance of the central cabin.
In order to transport the material to the position of the cutter head 3 and transport the material detached from the cutter head 3 outwards, a material transport system is further arranged in the heading machine, specifically, as shown in fig. 1, the material transport system comprises a shield body hoisting unit 13 located at the rear side of the shield body and a carrying mechanism located in the shield body, and the carrying mechanism comprises a shield inner rail 8 and a material transport trolley 9 matched with the shield inner rail 8.
As shown in fig. 1 and fig. 2, the inner shield track 8 extends from the outside of the central compartment to the inside of the central compartment, and in order to ensure that the material passage door can be opened and closed normally, the inner shield track 8 includes an outer door section 14 located at the rear side of the material passage door, an inner door section 15 located at the inner side of the material passage door, and a transition section 16 connected between the outer door section 14 and the inner door section 15, wherein the transition section 16 is detachably installed in the shield body 1, and has a length such that the space left by the transition section after the detachment enables the material passage door to be opened and closed normally. During operation, the lifting unit 13 in the shield body lowers the cutter cylinder assembly 12 onto the material transfer trolley 9, and the cutter cylinder assembly 12 is conveyed to the central cabin through the material channel 6 by the material transfer trolley 9.
As for the sealing plate 5, as shown in fig. 1 and 2, in this embodiment, the sealing plate 5 is a flat plate structure, the central channel 4 of the main drive 2 is utilized to enclose a central cabin, so that the shield inner rail 8 for transferring materials is directly laid at the bottom of the inner wall of the central channel 4 of the main drive, so that the laying position of the shield inner rail 8 is as low as possible, and on the premise of ensuring that the radial dimension of the central cabin is qualified, the radial dimension of the central channel 4 of the main drive can be miniaturized as much as possible, and further, the radial dimension of the main drive 2 is as small as possible, thereby facilitating the miniaturization of the heading machine. Meanwhile, as shown in fig. 2, the partition plate 5 is of a flat plate structure, so that the central rotary joint 7 and the elbow 10 of the pipeline connected with the central rotary joint 7 are arranged relatively in the front, a large space is reserved on the rear side of the main drive 2, and the materials lifted by the lifting unit 13 in the shield body can smoothly fall onto the material transfer trolley 9.
In this embodiment, shrouding 5 adopts the welded mode to fix on the rear end face of main drive 2's central passageway wall body 22, for guaranteeing that shrouding 5 has qualified compressive capacity, in this embodiment, welded connection has strengthening rib (not shown in the figure) between shrouding 5 inboard face and main drive 2's central passageway wall body 22 to guarantee that the centre cabin has qualified compressive strength.
In order to ensure that the central cabin has a proper axial dimension, the rear end of the central passage wall 22 of the main drive 2 extends backwards to a proper position, in the embodiment, the rear end of the central passage wall 22 of the main drive extends to the position of the speed reducer 18, based on this, as shown in fig. 3, the diameter of the sealing plate 5 is set to be larger than the diameter of the central passage 4 of the main drive, the speed reducer mounting hole 21 for mounting the speed reducer 18 is opened on the part of the sealing plate 5, which is located outside the contour line 20 of the central passage 4, the plate structure surrounding the central cabin and the structure for fixing the speed reducer 18 are integrally set, and the processes of processing parts in the production process of the main drive are reduced. Of course, the rear end of the portion of the drive housing enclosing the central passage 4 may also be located in front of the reducer 18, on the premise of meeting the requirement of the axial dimension of the central compartment.
In other embodiments, can also be equivalent to the radial dimension of main drive's central channel for the radial dimension with the shrouding design, so set up the shrouding in main drive's central channel to connect the strengthening rib between shrouding rear side face and main drive central channel's inner wall, certainly, can not set up the strengthening rib under the prerequisite that central cabin has qualified compressive strength can be guaranteed to shrouding self structural strength. In other embodiments, the plate may be bolted to the rear end of the central passage wall 22 of the primary drive.
According to the utility model, the central channel 4 of the main drive 2 is utilized, the sealing plate is matched with the central channel wall body 22 of the main drive 2 to enclose the central cabin, and the central cabin is integrated on the main drive, so that the radial size of the corresponding position of the central cabin is the radial size of the central channel 4 of the main drive 2, and on the basis of the radial size, the radial size of the central channel 4 of the main drive 2 can be as small as possible on the premise of ensuring that the radial size of the central cabin is qualified. The heading machine in this embodiment is a heading machine with a diameter of seven meters, and the diameter of the central channel thereof is two meters. With this concept, any fixing structure that can fix the closing plate to the rear end of the center passage wall body 22 can be adopted for the specific fixing structure of the closing plate 5 to the center passage wall body 22 of the main drive 2.
The specific embodiment 2 of the normal pressure type cutterhead tunneling machine provided by the utility model is mainly different from the embodiment 1 in that: in embodiment 1, the carrying mechanism includes track in dolly and the shield are transported to the material, and in this embodiment, the carrying mechanism includes the plummer, and the plummer is installed at the shield internally through flexible mounting structure, and the plummer can contract to material passageway door rear side through flexible mounting structure, ensures that carrying mechanism can not lead to the fact the influence to opening and shutting of material passageway door.
The specific embodiment 3 of the normal pressure type cutterhead tunneling machine provided by the utility model is mainly different from the embodiment 1 in that: in the embodiment 1, the sealing plate is a flat plate, and in the embodiment, the sealing plate is a curved plate with a middle part recessed into the central channel. Of course, in other embodiments, the sealing plate may also be a curved plate with a middle portion protruding backward.
In the embodiment of the main drive of the normal pressure type cutter head tunneling machine, the structure of the main drive of the normal pressure type cutter head tunneling machine is the same as that of the main drive in any one of the embodiments 1 to 3 of the normal pressure type cutter head tunneling machine, and details are not described here.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments without inventive effort, or some technical features of the present invention may be substituted with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. The utility model provides a normal pressure formula blade disc entry driving machine main drive, includes the drive box, central channel (4) that link up around drive box middle part is, normal pressure formula blade disc entry driving machine main drive still include for the fixed drive arrangement of drive box, drive arrangement are used for providing power for the rotation that corresponds the blade disc, characterized by, enclosing of drive box encloses partial rear end sealing connection of central channel (4) has shrouding (5), shrouding (5) shutoff the rear end of central channel (4) is in order to enclose out the center cabin, center position of shrouding (5) is offered and is used for center rotary joint mounting hole (19) of installation center rotary joint (7).
2. A main drive of a normal pressure type cutter head tunneling machine according to claim 1, wherein the sealing plate (5) is located at a position where a speed reducer (18) of the drive device is located, the diameter of the sealing plate (5) is larger than that of the central passage (4), and a speed reducer mounting hole (21) for mounting the speed reducer (18) is formed in the sealing plate (5).
3. A normal pressure cutterhead borer main drive according to claim 1 or 2, wherein said sealing plate (5) is a flat plate or a curved plate with a central portion recessed into said central channel (4).
4. A normal pressure cutterhead roadheader main drive according to claim 3, wherein said sealing plate (5) is fixed to the portion of the drive casing surrounding said central passage (4) by means of welded connections.
5. A main drive of a normal pressure type cutterhead roadheader as claimed in claim 4, wherein said sealing plate (5) is a flat plate, and reinforcing ribs are fixedly connected between the edge of the sealing plate (5) of the flat plate structure and the inner wall of the central channel (4).
6. A normal pressure cutterhead borer main drive according to claim 5, wherein the reinforcing ribs are connected to the inside face of the sealing plate (5).
7. A normal pressure type cutterhead tunneling machine comprises a shield body and a main drive arranged in the shield body, and is characterized in that the main drive is the main drive of the normal pressure type cutterhead tunneling machine according to any one of claims 1-6.
CN202123257777.0U 2021-12-20 2021-12-20 Main drive of normal pressure type cutter head tunneling machine and normal pressure type cutter head tunneling machine Active CN216866693U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202123257777.0U CN216866693U (en) 2021-12-20 2021-12-20 Main drive of normal pressure type cutter head tunneling machine and normal pressure type cutter head tunneling machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202123257777.0U CN216866693U (en) 2021-12-20 2021-12-20 Main drive of normal pressure type cutter head tunneling machine and normal pressure type cutter head tunneling machine

Publications (1)

Publication Number Publication Date
CN216866693U true CN216866693U (en) 2022-07-01

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