CN208500081U - A kind of high-rise building lift appliance - Google Patents

A kind of high-rise building lift appliance Download PDF

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Publication number
CN208500081U
CN208500081U CN201820697961.6U CN201820697961U CN208500081U CN 208500081 U CN208500081 U CN 208500081U CN 201820697961 U CN201820697961 U CN 201820697961U CN 208500081 U CN208500081 U CN 208500081U
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CN
China
Prior art keywords
fixedly installed
carriage
rise building
lift appliance
plate
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Expired - Fee Related
Application number
CN201820697961.6U
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Chinese (zh)
Inventor
刘克稳
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Chengdu Guangri Electrical Equipment Co Ltd
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Chengdu Guangri Electrical Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chengdu Guangri Electrical Equipment Co Ltd filed Critical Chengdu Guangri Electrical Equipment Co Ltd
Priority to CN201820697961.6U priority Critical patent/CN208500081U/en
Application granted granted Critical
Publication of CN208500081U publication Critical patent/CN208500081U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model provides a kind of high-rise building lift appliance, is related to building system technical field.The high-rise building lift appliance, including carriage, lintel is fixedly installed at the top of the carriage, filter device is fixedly installed at the top of the lintel, the right side of the filter device is communicated with air intake device by blast pipe, the inside of the carriage is fixedly installed with homogenating plate, what the air intake device was connected to by discharge pipe with homogenating plate, and the bottom of the homogenating plate is communicated with air outlet.The high-rise building lift appliance, pass through setting filter device, Rose Box, dust hood, deck, the first filter plate, the second filter plate and third filter plate, under the extraction of blower, first filter plate, the second filter plate and third filter plate can absorb and filter the air outside carriage, this is conducive to the inside for being avoided the air with dust from entering carriage, makes the good dustproof effect of the high-rise building lift appliance.

Description

A kind of high-rise building lift appliance
Technical field
The utility model relates to building system technical field, specially a kind of high-rise building lift appliance.
Background technique
Building, noun, i.e. building, mansion, " building " word indicate in archaic Chinese " sets pinnacled building, " space " word is in Gu Also there is the meaning of house, eaves in Chinese, for literal meaning, building refer to tall and big building construction.
Elevator is a part indispensable in building system, and elevator is as indispensable vertical in people's daily life The vehicles, most elevators can be accomplished to be safely operated, but the more difficult improvement of noise or elimination when operation, become elevator The thorny problem of maintenance company, also, existing building are poor with lift appliance damping and ventilation effect, when elevator falls When, it often will cause serious economic loss, threaten to the life of people.
Utility model content
(1) the technical issues of solving
In view of the deficiencies of the prior art, the utility model provides a kind of high-rise building lift appliance, solves existing High-rise building is big with lift appliance noise, the poor problem low with safety of ventilation effect.
(2) technical solution
In order to achieve the above object, the utility model is achieved by the following technical programs: a kind of high-rise building elevator Device, including carriage are fixedly installed with lintel at the top of the carriage, are fixedly installed with filter device at the top of the lintel, The right side of the filter device is communicated with air intake device by blast pipe, and the inside of the carriage is fixedly installed with homogenating plate, institute State what air intake device was connected to by discharge pipe with homogenating plate, the bottom of the homogenating plate is communicated with air outlet, the carriage two sides Bottom be provided with ventilation web plate, the two sides of the carriage inner wall are fixedly installed with acoustical cotton, and the two sides of the carriage are equal It is fixedly installed with denoising device, the dead astern of the carriage inner wall is fixedly installed with protective device, the bottom setting of the carriage There is damping device.
Preferably, the filter device includes Rose Box, is fixedly installed with dust hood on the left of the filtering chamber interior wall, institute The top and bottom for stating filtering chamber interior wall is fixedly installed with deck, is connected with the first filtering respectively between two opposite decks Plate, the second filter plate and third filter plate.
Preferably, the air intake device includes cabinet, and blower, the blower are fixedly installed at the top of the cabinet inner wall Air inlet be connected to filter device by blast pipe, bracket is fixedly installed on the right side of the cabinet inner wall, the bracket One end is fixedly installed with water cooling tube, and the inside of the water cooling tube is fixedly installed with water cooling net, and the air outlet of the blower is communicated with Discharge pipe, the discharge pipe sequentially pass through the top of water cooling tube, water cooling net, the bottom of water cooling tube, lintel far from one end of blower With the top of carriage and extend to the inside of carriage.
Preferably, the denoising device includes noise reduction box, and the noise reduction box is communicated with sound-absorbing cover far from the side of carriage, institute The inside for stating noise reduction box is fixedly installed with abatvoix, and the side inside the noise reduction box is fixedly installed with leading note stick, the leading note Bloop is fixedly installed on stick.
Preferably, the protective device includes protective housing, and the front surface of the protective housing is fixedly mounted there are two mounting base, Handle is fixedly installed between two mounting bases, the bottom of the protective housing is fixedly installed with tachymeter, the top of the protective housing Portion is fixedly installed with alarm, is provided with emergency button on the right side of the protective housing.
Preferably, the damping device includes surge tank, and the two sides of the damping chamber interior wall are fixedly installed with slide, and two Buffer board is slidably connected between a slide, and support rod, the top of the support rod are fixedly installed at the top of the buffer board It is fixedly installed with bottom plate, adjustable spring, the buffer board and damping are arranged on the support rod between the bottom plate and surge tank It is fixedly connected between the bottom of chamber interior wall by damping spring.
Preferably, the water cooling tube is internally provided with cooling water.
Preferably, the quantity of the damping spring is five, and five damping spring equidistant parallels are distributed in damping chamber interior wall Bottom.
(3) beneficial effect
The utility model provides a kind of high-rise building lift appliance.Have it is following the utility model has the advantages that
1, the high-rise building lift appliance passes through setting filter device, Rose Box, dust hood, deck, the first filtering Plate, the second filter plate and third filter plate, under the extraction of blower, the first filter plate, the second filter plate and third filter plate energy Enough to absorb and filter to the air outside carriage, this is conducive to the inside for being avoided the air with dust from entering carriage, makes The good dustproof effect of the high-rise building lift appliance.
2, the high-rise building lift appliance passes through cabinet, blower, blast pipe, bracket, water cooling tube, water cooling net, outlet air The cooperation of pipe, homogenating plate and air outlet, water cooling net can be such that the water temperature inside water cooling tube declines, meanwhile, when blower extracts Air can become the lower air of temperature and be discharged into carriage by homogenating plate and air outlet when entering the inside of water cooling tube Portion, on the one hand, keep the air circulation of cab interior more preferable, on the other hand, be conducive to radiate to cab interior.
3, the high-rise building lift appliance passes through acoustical cotton, denoising device, noise reduction box, sound-absorbing cover, abatvoix, leading note The cooperation of stick and bloop, firstly, acoustical cotton can adsorb the noise of cab interior, secondly, when carriage is run outside it The noise in portion can be entered the inside of noise reduction box by sound-absorbing cover, by the absorption of abatvoix and the spiral weakening effect of bloop, Greatly reduce noise, is conducive to keep good seating environment.
4, the high-rise building lift appliance, passes through protective device, protective housing, mounting base, handle, tachymeter, alarm With the cooperation of emergency button, tachymeter can in real time be detected the speed of elevator operation, when elevator is abnormal speed change, Alarm device can sound, meanwhile, people can make elevator brake emergency stop by emergency button, highly-safe.
5, the high-rise building lift appliance passes through damping device, surge tank, slide, buffer board, support rod, flexible bullet The cooperation of spring, bottom plate and damping spring, when lift car generation rapidly drops, adjustable spring and damping spring can pass through bullet Property deformation make tenesmus generate impact force be greatly reduced, can effectively reduce the injury that passenger is subject to.
Detailed description of the invention
FIG. 1 is a schematic structural view of the utility model;
Fig. 2 is the structural schematic diagram of the utility model filter device;
Fig. 3 is the structural schematic diagram of the utility model air intake device;
Fig. 4 is the structural schematic diagram of the utility model denoising device;
Fig. 5 is the structural schematic diagram of the utility model protective device;
Fig. 6 is the structural schematic diagram of the utility model damping device.
In figure: 1 carriage, 2 lintels, 3 filter devices, 31 Rose Boxes, 32 dust hoods, 33 decks, 34 first filter plates, 35 Second filter plate, 36 third filter plates, 4 air intake devices, 41 cabinets, 42 blowers, 43 blast pipes, 44 brackets, 45 water cooling tubes, 46 Water cooling net, 47 discharge pipes, 5 homogenating plates, 6 air outlets, 7 ventilation web plates, 8 acoustical cottons, 9 denoising devices, 91 noise reduction boxes, 92 sound-absorbings Cover, 93 abatvoixs, 94 leading note sticks, 95 bloops, 10 protective devices, 101 protective housings, 102 mounting bases, 103 handles, 104 are tested the speed Instrument, 105 alarms, 106 emergency buttons, 11 damping devices, 111 surge tanks, 112 slides, 113 buffer boards, 114 support rods, 115 adjustable springs, 116 bottom plates, 117 damping springs.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.
The utility model embodiment provides a kind of high-rise building lift appliance, as shown in figures 1 to 6, including carriage 1, carriage 1 top is fixedly installed with lintel 2, and the top of lintel 2 is fixedly installed with filter device 3, and filter device 3 includes Rose Box 31, Dust hood 32 is fixedly installed on the left of 31 inner wall of Rose Box, the top and bottom of 31 inner wall of Rose Box is fixedly installed with deck 33, it is connected with the first filter plate 34, the second filter plate 35 and third filter plate 36 respectively between two opposite decks 33, passes through Filter device 3, Rose Box 31, dust hood 32, deck 33, the first filter plate 34, the second filter plate 35 and third filter plate are set 36, under the extraction of blower 42, the first filter plate 34, the second filter plate 35 and third filter plate 36 can be to carriage 1 outside Air is absorbed and filter, this is conducive to the inside for being avoided the air with dust from entering carriage 1, makes the high-rise building electricity consumption The right side of the good dustproof effect of ladder device, filter device 3 is communicated with air intake device 4 by blast pipe 43, and air intake device 4 includes machine Case 41, blower 42 is fixedly installed at the top of 41 inner wall of cabinet, and the air inlet of blower 42 passes through blast pipe 43 and filter device 3 It is connected to, is fixedly installed with bracket 44 on the right side of 41 inner wall of cabinet, one end of bracket 44 is fixedly installed with water cooling tube 45, water cooling tube 45 Be internally provided with cooling water, the inside of water cooling tube 45 is fixedly installed with water cooling net 46, and the air outlet of blower 42 is communicated with outlet air Pipe 47, discharge pipe 47 sequentially passed through far from one end of blower 42 top of water cooling tube 45, water cooling net 46, water cooling tube 45 bottom, The top of lintel 2 and carriage 1 and the inside for extending to carriage 1 pass through cabinet 41, blower 42, blast pipe 43, bracket 44, water cooling The cooperation of pipe 45, water cooling net 46, discharge pipe 47, homogenating plate 5 and air outlet 6, water cooling net 46 can make the water inside water cooling tube 45 Temperature decline, meanwhile, the lower air of temperature can be become when the air that blower 42 extracts enters the inside of water cooling tube 45 And the inside of carriage 1 is discharged by homogenating plate 5 and air outlet 6, on the one hand, keep the air circulation inside carriage 1 more preferable, it is another Aspect is conducive to radiate to inside carriage 1, and the inside of carriage 1 is fixedly installed with homogenating plate 5, and air intake device 4 passes through outlet air Pipe 47 is connected to homogenating plate 5, and the bottom of homogenating plate 5 is communicated with air outlet 6, and the bottom of 1 two sides of carriage is provided with ventilated net Plate 7, the two sides of 1 inner wall of carriage are fixedly installed with acoustical cotton 8, and the two sides of carriage 1 are fixedly installed with denoising device 9, noise reduction Device 9 includes noise reduction box 91, and noise reduction box 91 is communicated with sound-absorbing cover 92, the fixed peace in the inside of noise reduction box 91 far from the side of carriage 1 Equipped with abatvoix 93, the side inside noise reduction box 91 is fixedly installed with leading note stick 94, is fixedly installed with bloop on leading note stick 94 95, by the cooperation of acoustical cotton 8, denoising device 9, noise reduction box 91, sound-absorbing cover 92, abatvoix 93, leading note stick 94 and bloop 95, Firstly, acoustical cotton 8 can adsorb the noise inside carriage 1, secondly, its external noise can be by inhaling when carriage 1 is run Sound cover 92 enters the inside of noise reduction box 91, by the absorption of abatvoix 93 and the spiral weakening effect of bloop 95, makes noise Greatly reduce, be conducive to keep good seating environment, the dead astern of 1 inner wall of carriage is fixedly installed with protective device 10, protection Device 10 includes protective housing 101, and the front surface of protective housing 101 is fixedly mounted there are two mounting base 102, two mounting bases 102 it Between be fixedly installed with handle 103, the bottom of protective housing 101 is fixedly installed with tachymeter 104, the fixed peace in the top of protective housing 101 Equipped with alarm 105, the right side of protective housing 101 is provided with emergency button 106, passes through protective device 10, protective housing 101, installation The cooperation of seat 102, handle 103, tachymeter 104, alarm 105 and emergency button 106, tachymeter 104 can be in real time to elevator The speed of operation is detected, and when elevator is abnormal speed change, alarm device 105 can sound, meanwhile, people can be pressed by emergency Button 106 makes elevator brake emergency stop, highly-safe, and the bottom of carriage 1 is provided with damping device 11, and damping device 11 includes surge tank 111, the two sides of 111 inner wall of surge tank are fixedly installed with slide 112, slidably connect buffer board between two slides 112 113, the top of buffer board 113 is fixedly installed with support rod 114, and the top of support rod 114 is fixedly installed with bottom plate 116, bottom plate Adjustable spring 115, the bottom of buffer board 113 and 111 inner wall of surge tank are arranged on support rod 114 between 116 and surge tank 111 It is fixedly connected between portion by damping spring 117, the quantity of damping spring 117 is five, five 117 equideparture of damping spring Row is distributed in the bottom of 111 inner wall of surge tank, passes through damping device 11, surge tank 111, slide 112, buffer board 113, support rod 114, the cooperation of adjustable spring 115, bottom plate 116 and damping spring 117, when the generation of lift car 1 rapidly drops, stretch bullet The impact force that spring 115 and damping spring 117 can be such that tenesmus generates by elastic deformation is greatly reduced, and be can effectively reduce and is taken people The injury that member is subject to.
The electric elements occurred in this article are electrically connected with extraneous main controller and 220V alternating current, and main controller can be meter Calculation machine etc. plays the conventionally known equipment of control.
Working principle: in use, after blower 42 starts, under the extraction of blower 42, the filtering of the first filter plate 34, second Plate 35 and third filter plate 36 can absorb and filter the air outside carriage 1, this is conducive to be avoided the sky with dust Gas enters the inside of carriage 1, makes the good dustproof effect of the high-rise building lift appliance, meanwhile, when the sky that blower 42 extracts Gas can become the lower air of temperature and is discharged into carriage 1 by homogenating plate 5 and air outlet 6 when entering the inside of water cooling tube 45 Portion, on the one hand, keep the air circulation inside carriage 1 more preferable, on the other hand, be conducive to radiate to inside carriage 1, together When, its external noise can be entered the inside of noise reduction box 91 by sound-absorbing cover 92 when carriage 1 is run, and pass through the absorption of abatvoix 93 With the spiral weakening effect of bloop 95, greatly reduce noise, is conducive to keep good seating environment, meanwhile, tachymeter 104 can in real time detect the speed of elevator operation, and when elevator is abnormal speed change, alarm device 105 can sound, together When, people can make elevator brake emergency stop by emergency button 106, and it is highly-safe, meanwhile, when the generation of lift car 1 rapidly drops When, the impact force that adjustable spring 115 and damping spring 117 can be such that tenesmus generates by elastic deformation is greatly reduced, can be effective Reduce the injury that passenger is subject to.
In conclusion the high-rise building lift appliance, passes through setting filter device 3, Rose Box 31, dust hood 32, card The 33, first filter plate 34 of seat, the second filter plate 35 and third filter plate 36, under the extraction of blower 42, the first filter plate 34, the Two filter plates 35 and third filter plate 36 can absorb and filter the air outside carriage 1, this is conducive to be avoided with ash The air of dirt enters the inside of carriage 1, makes the good dustproof effect of the high-rise building lift appliance.
Also, the high-rise building lift appliance passes through cabinet 41, blower 42, blast pipe 43, bracket 44, water cooling tube 45, the cooperation of water cooling net 46, discharge pipe 47, homogenating plate 5 and air outlet 6, water cooling net 46 can make the water body inside water cooling tube 45 Temperature decline, meanwhile, the lower air of temperature can be become simultaneously when the air that blower 42 extracts enters the inside of water cooling tube 45 The inside of carriage 1 is discharged by homogenating plate 5 and air outlet 6, on the one hand, keep the air circulation inside carriage 1 more preferable, another party Face is conducive to radiate to inside carriage 1.
Also, the high-rise building lift appliance by acoustical cotton 8, denoising device 9, noise reduction box 91, sound-absorbing cover 92, is inhaled The cooperation of soundboard 93, leading note stick 94 and bloop 95, firstly, acoustical cotton 8 can adsorb the noise inside carriage 1, Secondary, its external noise can be entered the inside of noise reduction box 91 by sound-absorbing cover 92 when carriage 1 is run, and pass through the absorption of abatvoix 93 With the spiral weakening effect of bloop 95, greatly reduce noise, is conducive to keep good seating environment.
Also, the high-rise building lift appliance passes through protective device 10, protective housing 101, mounting base 102, handle 103, the cooperation of tachymeter 104, alarm 105 and emergency button 106, tachymeter 104 can be in real time to the speed of elevator operation It is detected, when elevator is abnormal speed change, alarm device 105 can sound, meanwhile, people can make electricity by emergency button 106 Ladder brake emergency stop, it is highly-safe.
Also, the high-rise building lift appliance, by damping device 11, surge tank 111, slide 112, buffer board 113, The cooperation of support rod 114, adjustable spring 115, bottom plate 116 and damping spring 117 is stretched when the generation of lift car 1 rapidly drops The impact force that contracting spring 115 and damping spring 117 can be such that tenesmus generates by elastic deformation is greatly reduced, and be can effectively reduce and is multiplied The injury that seat personnel are subject to.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment Intrinsic element.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art, It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.

Claims (8)

1. a kind of high-rise building lift appliance, including carriage (1), it is characterised in that: the top of the carriage (1) is fixedly mounted Have lintel (2), be fixedly installed with filter device (3) at the top of the lintel (2), the right side of the filter device (3) by into Air hose (43) is communicated with air intake device (4), and the inside of the carriage (1) is fixedly installed with homogenating plate (5), the air intake device (4) it is connected to by discharge pipe (47) with homogenating plate (5), the bottom of the homogenating plate (5) is communicated with air outlet (6), the sedan-chair The bottom of compartment (1) two sides is provided with ventilation web plate (7), and the two sides of carriage (1) inner wall are fixedly installed with acoustical cotton (8), the two sides of the carriage (1) are fixedly installed with denoising device (9), and the dead astern of carriage (1) inner wall is fixedly mounted Have protective device (10), the bottom of the carriage (1) is provided with damping device (11).
2. a kind of high-rise building lift appliance according to claim 1, it is characterised in that: filter device (3) packet It includes Rose Box (31), is fixedly installed with dust hood (32) on the left of Rose Box (31) inner wall, Rose Box (31) inner wall Top and bottom be fixedly installed with deck (33), be connected with the first filter plate respectively between two opposite decks (33) (34), the second filter plate (35) and third filter plate (36).
3. a kind of high-rise building lift appliance according to claim 1, it is characterised in that: air intake device (4) packet It includes cabinet (41), is fixedly installed with blower (42) at the top of cabinet (41) inner wall, the air inlet of the blower (42) passes through Blast pipe (43) is connected to filter device (3), is fixedly installed with bracket (44), the bracket on the right side of cabinet (41) inner wall (44) one end is fixedly installed with water cooling tube (45), and the inside of the water cooling tube (45) is fixedly installed with water cooling net (46), described The air outlet of blower (42) is communicated with discharge pipe (47), and the discharge pipe (47) sequentially passes through water cooling far from the one end of blower (42) It manages the top of the top of (45), water cooling net (46), the bottom of water cooling tube (45), lintel (2) and carriage (1) and extends to carriage (1) inside.
4. a kind of high-rise building lift appliance according to claim 1, it is characterised in that: denoising device (9) packet It includes noise reduction box (91), the noise reduction box (91) is communicated with sound-absorbing cover (92) far from the side of carriage (1), the noise reduction box (91) Inside is fixedly installed with abatvoix (93), and the internal side of the noise reduction box (91) is fixedly installed with leading note stick (94), described to lead Bloop (95) are fixedly installed on clave (94).
5. a kind of high-rise building lift appliance according to claim 1, it is characterised in that: protective device (10) packet It includes protective housing (101), there are two mounting base (102), two mounting bases for the front surface fixed installation of the protective housing (101) (102) it is fixedly installed between handle (103), the bottom of the protective housing (101) is fixedly installed with tachymeter (104), described It is fixedly installed at the top of protective housing (101) alarm (105), is provided with emergency button on the right side of the protective housing (101) (106)。
6. a kind of high-rise building lift appliance according to claim 1, it is characterised in that: damping device (11) packet Include surge tank (111), the two sides of surge tank (111) inner wall are fixedly installed with slide (112), two slides (112) it Between slidably connect buffer board (113), be fixedly installed with support rod (114), the support rod at the top of the buffer board (113) (114) top is fixedly installed with bottom plate (116), on the support rod (114) between the bottom plate (116) and surge tank (111) It is arranged with adjustable spring (115), passes through damping spring between the buffer board (113) and the bottom of surge tank (111) inner wall (117) it is fixedly connected.
7. a kind of high-rise building lift appliance according to claim 3, it is characterised in that: the water cooling tube (45) it is interior Portion is provided with cooling water.
8. a kind of high-rise building lift appliance according to claim 6, it is characterised in that: the damping spring (117) Quantity be five, five damping spring (117) equidistant parallels are distributed in the bottom of surge tank (111) inner wall.
CN201820697961.6U 2018-05-11 2018-05-11 A kind of high-rise building lift appliance Expired - Fee Related CN208500081U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201820697961.6U CN208500081U (en) 2018-05-11 2018-05-11 A kind of high-rise building lift appliance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201820697961.6U CN208500081U (en) 2018-05-11 2018-05-11 A kind of high-rise building lift appliance

Publications (1)

Publication Number Publication Date
CN208500081U true CN208500081U (en) 2019-02-15

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ID=65298453

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201820697961.6U Expired - Fee Related CN208500081U (en) 2018-05-11 2018-05-11 A kind of high-rise building lift appliance

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Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110660308A (en) * 2019-11-13 2020-01-07 徐州弘久网络科技有限公司 Sand table demonstration device for network technology teaching

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110660308A (en) * 2019-11-13 2020-01-07 徐州弘久网络科技有限公司 Sand table demonstration device for network technology teaching

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