CN211375993U - Automatic demonstration system device for working principle of program-controlled exchange T-shaped connector - Google Patents
Automatic demonstration system device for working principle of program-controlled exchange T-shaped connector Download PDFInfo
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- CN211375993U CN211375993U CN201921920235.7U CN201921920235U CN211375993U CN 211375993 U CN211375993 U CN 211375993U CN 201921920235 U CN201921920235 U CN 201921920235U CN 211375993 U CN211375993 U CN 211375993U
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Abstract
The utility model discloses an automatic demonstration system device of program-controlled exchange T connector working principle, which comprises a voice storage device, two TS time slots are symmetrically arranged at two sides of the voice storage device, two address support sliding rods are arranged corresponding to the two TS time slots, the address support sliding rods are vertically arranged, and the two address support sliding rods are respectively connected with the other ends of the two TS time slots; the two address support sliding rods are provided with address scale marks corresponding to address storage marks on the voice storage device; the two cylinders are respectively arranged on the two TS time slots. The device shows the abstract time slot and time slot exchange concept and the working principle of the T-shaped wire connector in a physical mode, and is simple to operate. The whole process of time slot exchange can be completed only by making a prediction in advance according to the requirements of time slot storage and reading.
Description
Technical Field
The utility model relates to an instrument and teaching tool that teaching and technical training used, in particular to automatic demonstration system device of programme-controlled exchange T connector theory of operation.
Background
Devices that utilize the random access memory principle to perform the time slot switching function are referred to as digital switching networks. The digital switching network in the program-controlled digital switching system is generally composed of a T-switch and an S-switch.
The T-shaped time division wire connector is also called a time type wire connector and is called a T-shaped wire connector for short. It is composed of Speech Memory (SM) and Control Memory (CM), and its function is to exchange time slots to complete the information exchange of different time slots in the same bus, i.e. to exchange the information of a certain time slot in a certain time division multiplex line to another time slot. The SM writes the digitized voice signal from one time slot and then reads it from another time slot under the control of the CM, thereby implementing time slot swapping of the voice signal.
The SM is used for temporarily storing PCM-coded digital human voice information and is composed of a Random Access Memory (RAM). The CM is also constituted by a RAM for controlling writing or reading of the SM stored information. The SM stores voice information and the CM is the address of the stored SM.
The above knowledge points and technical points about the exchange module are often difficult for a learner to understand and master in the actual teaching process. The reason is that the time slots and the addresses and the time slot exchange are described in an abstract and virtual form, cannot be seen and are understood by imagination. The whole process of time slot exchange and control principle cannot be displayed completely and intuitively even if a program control exchange experimental box is used for carrying out project experiments and information such as square waves and the like is seen on an oscilloscope.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem be, can only verify the principle and can not directly perceivedly show time slot exchange and control process, participate in technical problem such as manual degree difference to among the current laboratory glassware mentioned in the background art.
The utility model aims to provide an automatic demonstration system device of programme-controlled exchange T connector theory of operation, one kind can show the most core part of programme-controlled exchange-the basic working process of time division switching module T connector with audio-visual three-dimensional mode, under keeping its order write in, control reading out and control writing in the unchangeable condition of two kinds of mode fundamental principle of order reading out promptly, through setting up memory device, controller device and link gear etc. fully demonstrate the more abstract principle of time slot exchange with audio-visual three-dimensional method, make the learner directly master the difficult technical point.
The utility model discloses specific technical scheme is:
a program control exchange T-connector working principle automatic demonstration system device comprises a voice storage device 1 which is formed by stacking a plurality of time slot storage units 2, and each time slot storage unit 2 is provided with an address storage label;
the two TS time slots 4 are symmetrically arranged on two sides of the voice storage device 1, the two TS time slots 4 are horizontally arranged, and one ends of the two TS time slots 4 are arranged on the voice storage device 1 in a sliding mode; TS time slots 17 are arranged on the TS time slots 4;
two address support sliding rods 6 are arranged corresponding to the two TS time slots 4, the address support sliding rods 6 are vertically placed, and the two address support sliding rods 6 are respectively connected with the other ends of the two TS time slots 4; the two address support sliding rods 6 are provided with address scale marks corresponding to the address storage marks on the voice storage device 1;
the two cylinders are respectively arranged on the two TS time slots 4 and used for pushing the TS time slot box 17 to enter the time slot storage unit 2 or pulling the TS time slot box 17 out of the time slot storage unit 2; the end part of the piston rod of the cylinder is detachably connected with the TS time slot box 17.
The device is designed for solving the difficulty in the actual teaching process, further adapting to project teaching, promoting middle school learning and improving the practical ability of learners. The device has the characteristics of direct viewing and three-dimensional: the abstract time slot and time slot exchange concept and the working principle of the T-shaped wire connector are displayed in a physical mode, so that learners can understand and accept more easily, and the core problem which is difficult to understand in a program control exchange course is solved; secondly, the function is complete: the concepts such as time slots, addresses, storage, control, sequence, exchange and the like which are difficult to understand can be fully explained and demonstrated by combining knowledge points and skill points of the exchange module; thirdly, the economy is suitable for the innovation strong: the device has compact structure, tries to show the most complex virtual abstract problem in the simplest and most intuitive mode, can manufacture a plurality of teaching aid devices under the condition of low cost, and further improves the actual practical ability of learners while learning and doing.
It is right the utility model discloses technical scheme's preferred, time slot memory cell 2 is a rectangle three-dimensional box for analog data memory SM, and the box body curb plate of rectangle three-dimensional box can be opened, lets TS time slot box 17 get into corresponding time slot memory cell 2.
It is right to the utility model discloses technical scheme's preferred, time slot memory cell 2 adopts transparent glass steel to make and forms, pastes address storage label number on time slot memory cell 2's side.
It is right the utility model discloses technical scheme's preferred, through two sets of linear guide pair connections between voice storage device 1 and the TS time slot 4, the linear guide in two sets of linear guide pairs is vertical to be fixed on voice storage device 1's outer wall, and TS time slot 4's tip is connected respectively to the slide in two sets of linear guide pairs.
It is right the utility model discloses technical scheme's preferred, be connected through gear between TS time slot 4 and the address support slide bar 6, be used for driving TS time slot 4 and support 6 up-and-down motion of slide bar along the address and carry out the address location, gear includes motor, gear and rack, and the rack is vertical to be fixed on address support slide bar 6, and the gear engagement rack, the gear is fixed on the motor shaft of motor, and the motor is installed on TS time slot 4's the back.
The technical proposal of the utility model is optimized, the TS time slot 4 is connected with the address support slide bar 6 through a sleeve driving mechanism, and is used for driving the TS time slot 4 to move up and down along the address support slide bar 6 to position the address;
the sleeve driving mechanism comprises a sleeve and a lifting cylinder, the sleeve is slidably sleeved on an address support sliding rod 6, the address support sliding rod 6 is a cylindrical rod, the sleeve is fixed at the end part of the TS time slot 4, a cylinder body of the lifting cylinder and the address support sliding rod 6 are fixed on the same fixed surface, and the end part of a piston rod of the lifting cylinder is fixed on the back surface of the TS time slot 4; the lifting cylinder is positioned at the central position of TS time slot 4.
It is right the utility model discloses technical scheme's preferred, TS time slot 4 is the square plate, the baffle that sets up perpendicularly at the side of square plate.
To the utility model discloses technical scheme's preferred, the bottom that the address supported slide bar 6 sets up horizontal bottom plate.
To the utility model discloses technical scheme's preferred, TS time slot box 17 is a cube box, and the top surface is empty.
Compared with the prior art, the utility model, its beneficial effect is:
1. the automatic demonstration system device for the working principle of the program-controlled exchange T-shaped wire connector shows the relatively abstract time slot and time slot exchange concept and the working principle of the T-shaped wire connector in a physical mode, and is simple to operate. The whole process of time slot exchange can be completed only by making a prediction in advance according to the requirements of time slot storage and reading.
2. The automatic demonstration system device for the working principle of the program-controlled exchange T-shaped wire connector is complete in function and strong in innovation, concepts which are difficult to understand, such as time slots, addresses, storage, control, sequence, exchange and the like, can be fully explained and demonstrated by combining knowledge points and skill points of an exchange module, a virtual abstract concept is shown by using a specific physical entity, the teaching effect can be remarkably improved, and the system device is innovative.
3. The automatic demonstration system device for the working principle of the program-controlled exchange T-shaped wire connector is compact in structure, economical and applicable, tries to show the most complex virtual abstraction problem in the simplest and most intuitive mode, and is low in cost for manufacturing a plurality of teaching aid devices, so that learners further improve the practical and manual ability while learning.
4. At present, no such product is available on the market, namely, a basic working process of a time division switching module T wire connector which is the most core part of a program control switching technology can be displayed in an intuitive and three-dimensional mode is provided in a physical form.
Drawings
Fig. 1 is a schematic diagram of a teaching board.
Fig. 2 is a schematic structural diagram of the device.
Fig. 3 is a schematic diagram of a TS timeslot structure.
Fig. 4 is a schematic diagram of a TS timeslot box structure.
Detailed Description
The technical solution of the present invention is explained in detail below, but the scope of protection of the present invention is not limited to the embodiments.
In order to make the disclosure of the present invention more comprehensible, the following description is further made in conjunction with the accompanying fig. 1 to 4 and the embodiments.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1:
as shown in fig. 1 and 2, an automatic demonstration system device for working principle of program-controlled exchange T-connector comprises a voice storage device 1, two TS time slots 4, two address support sliding rods 6 and two cylinders.
As shown in fig. 2, the voice storage apparatus 1 is constituted by stacking 31 time slot storage units 2, and an address storage label is provided on each time slot storage unit 2.
In this embodiment, the voice storage device 1 is formed by overlapping 31 time slot storage units 2 layer by layer. The time slot storage unit 2 is a rectangular solid box for simulating the data memory SM, and a box body side plate of the rectangular solid box can be opened to allow the TS time slot box 17 to enter the corresponding time slot storage unit 2. The time slot storage unit 2 is made of transparent glass steel, and address storage labels are pasted on the side face of the time slot storage unit 2.
The two TS time slots 4 are symmetrically arranged on two sides of the voice storage device 1, the two TS time slots 4 are horizontally arranged, and one ends of the two TS time slots 4 are arranged on the voice storage device 1 in a sliding mode; a TS slot box 17 is placed on the TS slot 4.
As shown in fig. 3, TS timeslot 4 is a square plate with vertically disposed baffles on the sides of the square plate. As shown in fig. 4, the TS timeslot box 17 is a cubic box, the top surface of which is empty, and an object replacing information can be placed in the TS timeslot box 17 of this embodiment.
As shown in fig. 2, in this embodiment, the voice storage device 1 is connected to the TS timeslot 4 through two linear guide rail pairs, the linear guide rails in the two linear guide rail pairs are vertically fixed on the outer wall of the voice storage device 1, and the sliding seats in the two linear guide rail pairs are respectively connected to the end of the TS timeslot 4.
Two address support sliding rods 6 are arranged corresponding to the two TS time slots 4, the address support sliding rods 6 are vertically placed, and the two address support sliding rods 6 are respectively connected with the other ends of the two TS time slots 4; the two address support sliding rods 6 are provided with address scale marks corresponding to the address storage marks on the voice storage device 1. In this embodiment, 0-31 address scale marks are marked on the address support sliding rod 6. The bottom of the T-address support sliding rod 6 is provided with a horizontal bottom plate, and the T-address support sliding rod 6 is vertically fixed through the horizontal bottom plate.
The TS time slot 4 is connected with the address support sliding rod 6 through a gear transmission mechanism and used for driving the TS time slot 4 to move up and down along the address support sliding rod 6 to carry out address positioning, the gear transmission mechanism comprises a motor, a gear and a rack, the rack is vertically fixed on the address support sliding rod 6, the gear is meshed with the rack, the gear is fixed on a motor shaft of the motor, and the motor is installed on the back of the TS time slot 4.
The motor acts to drive the gear to move up and down along the rack, and the motor, the gear and the TS time slot 4 move up and down together. The TS time slot 4 is arranged on the address support slide bar 6 at one end with one pivot point and on the voice storage device 1 at the other end with two pivot points. Thus, on one hand, the TS time slot 4 can carry the TS time slot box 17 to slide in the horizontal direction; on the other hand, TS time slot 4 can slide vertically to perform address location.
The two cylinders are respectively arranged on the two TS time slots 4 and used for pushing the TS time slot box 17 to enter the time slot storage unit 2 or pulling the TS time slot box 17 out of the time slot storage unit 2; the end part of the piston rod of the cylinder is detachably connected with the TS time slot box 17.
Example 2:
as shown in fig. 1 and 2, an automatic demonstration system device for working principle of program-controlled exchange T-connector comprises a voice storage device 1, two TS time slots 4, two address support sliding rods 6 and two cylinders.
As shown in fig. 2, the voice storage apparatus 1 is constituted by stacking 31 time slot storage units 2, and an address storage label is provided on each time slot storage unit 2.
In this embodiment, the voice storage device 1 is formed by overlapping 31 time slot storage units 2 layer by layer. The time slot storage unit 2 is a rectangular solid box for simulating the data memory SM, and a box body side plate of the rectangular solid box can be opened to allow the TS time slot box 17 to enter the corresponding time slot storage unit 2. The time slot storage unit 2 is made of transparent glass steel, and address storage labels are pasted on the side face of the time slot storage unit 2.
The two TS time slots 4 are symmetrically arranged on two sides of the voice storage device 1, the two TS time slots 4 are horizontally arranged, and one ends of the two TS time slots 4 are arranged on the voice storage device 1 in a sliding mode; a TS slot box 17 is placed on the TS slot 4.
TS time slot 4 is the square plate, the baffle that sets up perpendicularly at the side of square plate. The TS time slot box 17 is a cubic box, the top surface is empty, and an object replacing information can be placed in the TS time slot box 17 of this embodiment.
As shown in fig. 2, in this embodiment, the voice storage device 1 is connected to the TS timeslot 4 through two linear guide rail pairs, the linear guide rails in the two linear guide rail pairs are vertically fixed on the outer wall of the voice storage device 1, and the sliding seats in the two linear guide rail pairs are respectively connected to the end of the TS timeslot 4.
Two address support sliding rods 6 are arranged corresponding to the two TS time slots 4, the address support sliding rods 6 are vertically placed, and the two address support sliding rods 6 are respectively connected with the other ends of the two TS time slots 4; the two address support sliding rods 6 are provided with address scale marks corresponding to the address storage marks on the voice storage device 1. In this embodiment, 0-31 address scale marks are marked on the address support sliding rod 6. The bottom of the T-address support sliding rod 6 is provided with a horizontal bottom plate, and the T-address support sliding rod 6 is vertically fixed through the horizontal bottom plate.
The TS time slot 4 is connected with the address support sliding rod 6 through a sleeve driving mechanism and is used for driving the TS time slot 4 to move up and down along the address support sliding rod 6 to position an address;
the sleeve driving mechanism comprises a sleeve and a lifting cylinder, the sleeve is slidably sleeved on an address support sliding rod 6, the address support sliding rod 6 is a cylindrical rod, the sleeve is fixed at the end part of the TS time slot 4, a cylinder body of the lifting cylinder and the address support sliding rod 6 are fixed on the same fixed surface, and the end part of a piston rod of the lifting cylinder is fixed on the back surface of the TS time slot 4; the lifting cylinder is positioned at the central position of TS time slot 4.
The lifting cylinder acts, and a piston rod of the lifting cylinder stretches and retracts to push the TS time slot 4 to move up and down. The TS time slot 4 is arranged on the address support slide bar 6 at one end with one pivot point and on the voice storage device 1 at the other end with two pivot points. Thus, on one hand, the TS time slot 4 can carry the TS time slot box 17 to slide in the horizontal direction; on the other hand, TS time slot 4 can slide vertically to perform address location.
The cylinder is arranged on the TS time slot 4 and used for pushing the TS time slot box 17 to enter the time slot storage unit 2 or pulling the TS time slot box 17 out of the time slot storage unit 2; the end part of the piston rod of the cylinder is detachably connected with the TS time slot box 17.
Further, in the specific implementation, the bottom surface of the time slot storage unit 2 of the rectangular three-dimensional box is designed to be an inclined surface, and the TS time slot box 17 of the cubic box is designed, the top surface is empty, and the surface facing the voice information storage unit can be opened. When performing a presentation, the TS slot box 17 is filled with a red bean or a green bean representing information, and when the TS slot box 17 is moved to the side of the voice storage device 1 by the cylinder driving, the red bean or the green bean is immediately opened and poured into the slot storage unit, and the TS slot box 17 does not enter the slot storage unit 2. When the information needs to be taken out, on the other side face of the voice storage device 1, when the TS time slot box 17 moves to the side face of the voice storage device 1 under the driving of the air cylinder, the side face plate of the voice storage device 1 is opened, and because the bottom face of the time slot storage unit 2 is an inclined face, the red beans or the green beans representing the information can automatically slide into the TS time slot box 17.
The demonstration process of the automatic demonstration system device for the working principle of the program control exchange T-shaped wire connector comprises the following steps:
whether the sequential writing and reading control mode or the writing and reading control mode is determined in advance before the demonstration. Taking sequential writing and controlled reading as an example, the TS is simulated3And TS19Carry out switching, TS3And TS19Is a TS slot box 17.
First, TS3And TS19Put on TS time slot 4, put TS3Red bean, TS, in which representative information is loaded19The mung beans representing the information are filled in the package.
Second, sliding TS time slot 4 up and down, adjusting address position, when movingBy address bit 19, the time slot box TS is pushed19To the time slot storage unit with address storage reference numeral 19, time slot box TS19Open on the side (cubic box TS time slot box 17, empty on the top, open on the side facing the voice information storage unit)19Pouring the mung beans into a time slot storage unit 2 with an address storage label of 19; when TS time slot 4 moves to address bit 3, push time slot box TS3To the time slot storage unit with address storage number 3, time slot box TS3Open-sided, time-slot boxes TS3The red beans in (a) are poured into a time slot storage unit 2 with the address storage label 3.
Thirdly, pasting a digital piece representing the address storage label No. 3 on the side surface of the time slot storage unit 2 with the address storage label No. 3, pasting a digital piece representing the address storage label No. 19 on the side surface of the time slot storage unit 2 with the address storage label No. 19, and finishing the storage setting.
Fourthly, the TS time slot 4 and the address support sliding rod 6 on the other side surface of the voice storage device 1 are adopted to complete information exchange of the time slot boxes TS3 and TS19, and the method specifically comprises the following steps:
an address support sliding bar 6 fixed vertically on the other side of the voice storage device 1, when moving to the address 3, the red bean in the time slot storage unit 2 with the address storage label 3 is automatically taken out by using a time slot box TS 19; when moving to address 19, the mung bean located in the time slot storage unit 2 of address storage reference numeral 19 is automatically fetched by the time slot box TS 3. (since the bottom surface of the time slot storage unit 2 has a certain left-right inclination, the beans can automatically slide into the time slot box). At this point the exchange of time slots TS3 and TS19 is complete. The principle is shown in fig. 1.
The automatic demonstration system device for the working principle of the program control exchange T-shaped wire connector can actually manufacture 0-31 time slot boxes. Multiple slots are placed in TS slot 4 for actual use. Only two TS slots boxes are typically selected for presentation during the presentation slot exchange process.
The automatic demonstration system device for the working principle of the program-controlled exchange T-shaped wire connector is visual and stereoscopic, displays the abstract concept of time slot and time slot exchange and the working principle of the T-shaped wire connector in a physical mode, enables learners to understand and accept the concept more easily, and solves the core problem that the learners are difficult to understand in a program-controlled exchange course.
The utility model discloses the part that does not relate to all is the same with prior art or can adopt prior art to realize.
As mentioned above, although the present invention has been shown and described with reference to certain preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A program control exchange T-connector working principle automatic demonstration system device is characterized by comprising a voice storage device (1) and a time slot storage unit (2), wherein the voice storage device is formed by stacking a plurality of time slot storage units (2), and each time slot storage unit (2) is provided with an address storage label;
the two TS time slots (4) are symmetrically arranged on two sides of the voice storage device (1), the two TS time slots (4) are horizontally arranged, and one ends of the two TS time slots (4) are arranged on the voice storage device (1) in a sliding mode; TS time slot boxes (17) are arranged on the TS time slots (4);
the two address support sliding rods (6) are arranged corresponding to the two TS time slots (4), the address support sliding rods (6) are vertically placed, and the two address support sliding rods (6) are respectively connected with the other ends of the two TS time slots (4); the two address support sliding rods (6) are provided with address scale marks corresponding to address storage marks on the voice storage device (1);
the two cylinders are respectively arranged on the two TS time slots (4) and used for pushing the TS time slot boxes (17) to enter the time slot storage unit (2) or pulling the TS time slot boxes (17) out of the time slot storage unit (2); the end part of a piston rod of the air cylinder is detachably connected with a TS time slot box (17).
2. Automatic demonstration system for the working principle of a program-controlled switch T-switch according to claim 1, characterised in that the time slot memory unit (2) is a rectangular three-dimensional box for simulating a data memory SM, the side walls of the rectangular three-dimensional box being openable to allow the TS time slot box (17) to enter the corresponding time slot memory unit (2).
3. The automatic demonstration system device for the operating principle of a program-controlled exchange T-switch according to claim 2, characterized in that the time slot storage unit (2) is made of transparent glass fiber reinforced plastic material, and address storage labels are pasted on the side surface of the time slot storage unit (2).
4. The automatic demonstration system device for the working principle of the program-controlled exchange T-wire connector according to claim 1, characterized in that the voice storage device (1) is connected with the TS time slot (4) through two linear guide rail pairs, the linear guide rails in the two linear guide rail pairs are vertically fixed on the outer wall of the voice storage device (1), and the sliding seats in the two linear guide rail pairs are respectively connected with the end part of the TS time slot (4).
5. The automatic demonstration system device for the operating principle of the program-controlled exchange T-connector according to claim 4, characterized in that the TS time slot (4) is connected with the address support sliding rod (6) through a gear transmission mechanism for driving the TS time slot (4) to move up and down along the address support sliding rod (6) for address positioning, the gear transmission mechanism comprises a motor, a gear and a rack, the rack is vertically fixed on the address support sliding rod (6), the gear is meshed with the rack, the gear is fixed on a motor shaft of the motor, and the motor is installed on the back of the TS time slot (4).
6. The automatic demonstration system device for the operating principle of the program-controlled exchange T-switch according to claim 4, characterized in that the TS time slot (4) is connected with the address support sliding rod (6) through a sleeve driving mechanism, and is used for driving the TS time slot (4) to move up and down along the address support sliding rod (6) for address positioning;
the sleeve driving mechanism comprises a sleeve and a lifting cylinder, the sleeve is slidably sleeved on an address support sliding rod (6), the address support sliding rod (6) is a cylindrical rod, the sleeve is fixed at the end part of the TS time slot (4), the cylinder body of the lifting cylinder and the address support sliding rod (6) are fixed on the same fixed surface, and the end part of the piston rod of the lifting cylinder is fixed on the back surface of the TS time slot (4); the lifting cylinder is positioned at the center of the TS time slot (4).
7. The apparatus for automatic demonstration of working principle of program-controlled exchange T-switch according to claim 1, characterized in that the TS time slot (4) is a square plate with vertically arranged baffles at the sides of the square plate.
8. The automatic demonstration system device for the working principle of program-controlled exchange T-switch according to claim 1, characterized in that the bottom of the address support sliding rod (6) is provided with a horizontal bottom plate.
9. The apparatus for automatic demonstration of the working principle of program-controlled exchange T-switch according to claim 1, characterized in that the TS time slot box (17) is a cubic box with an empty top surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921920235.7U CN211375993U (en) | 2019-11-08 | 2019-11-08 | Automatic demonstration system device for working principle of program-controlled exchange T-shaped connector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921920235.7U CN211375993U (en) | 2019-11-08 | 2019-11-08 | Automatic demonstration system device for working principle of program-controlled exchange T-shaped connector |
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| CN211375993U true CN211375993U (en) | 2020-08-28 |
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| CN201921920235.7U Active CN211375993U (en) | 2019-11-08 | 2019-11-08 | Automatic demonstration system device for working principle of program-controlled exchange T-shaped connector |
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| CN (1) | CN211375993U (en) |
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