CN205500477U - Construction hoist automatic leveling device - Google Patents
Construction hoist automatic leveling device Download PDFInfo
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- CN205500477U CN205500477U CN201620109718.9U CN201620109718U CN205500477U CN 205500477 U CN205500477 U CN 205500477U CN 201620109718 U CN201620109718 U CN 201620109718U CN 205500477 U CN205500477 U CN 205500477U
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Abstract
This patent application discloses construction hoist automatic leveling device, including setting up the intelligent control device and the photoelectric encoder of setting on the sample gear in the cage, intelligent control device includes microcontroller, supplies information input's keyboard, supplies information display's display screen and the output joint of being connected with the converter, the keyboard with microcontroller's input is connected, the display screen with output connect with microcontroller's output is connected. This patent has effectively improved the flat bed precision.
Description
Technical field
This utility model relates to a kind of leveling device, specifically discloses a kind of building hoist automatic floor approaching mechanism.
Background technology
Building hoist is again construction elevator for building, it is also possible to be referred to as outdoor elevators or building site bird cage, is the construction machinery for manned cargo-carrying commonly used in building, is mainly used in the construction of the buildings such as the interior and exterior finishes of skyscraper, bridge, chimney.
Existing building hoist generally comprise body structure cage, be arranged on cage drive motor and with drive the sampling gear that is connected of motor, sample gear and be arranged on building the basic rack as track and be meshed.Due to the body structure that building hoist is unique, workmen takes the most comfortable but also safety, and building hoist simple in construction, easy to use, lifting is quick, stable drive, is therefore generally used in construction.
But, former building hoist is typically Artificial Control dock floor, and often error is bigger, it is impossible to make the bottom surface of cage and floor in same level.Such as conventional SC200/200 rack-and-pinion construction elevator in actual use, often cannot accurately stop and put in place, it is impossible to automatic leveling.A lot of operators are in default of sufficient operating experience, it usually needs repeatedly repeatable operation can be only achieved flat bed effect, adds the work times of electric elements, also reduces the service life of electric elements to a certain extent, and the loss making whole building hoist is bigger.
In order to better control over the rotation driving motor, typically it is fitted with in existing building hoist and the converter driving motor to be connected, constitutes variable-frequency construction elevator.Converter is controlled, it is possible to achieve the automatic leveling of variable-frequency construction elevator by controlling equipment.But, variable-frequency construction elevator needs deceleration time due to converter when frequency conversion, although motor automatic retarding when cage is near destination can be driven to stop by Frequency Converter Control, but one section of braking distance can be produced when cage is stopped, and present variable-frequency construction elevator cannot accurately calculate and process braking distance, make the variable-frequency construction elevator cannot accurate flat bed.
Utility model content
This utility model is intended to provide a kind of building hoist automatic floor approaching mechanism, with solve existing building hoist cannot the problem of accurate automatic leveling.
For solving problem above, it is provided that following scheme:
Scheme one: building hoist automatic floor approaching mechanism, including the intelligent controlling device being arranged in cage and the photoelectric encoder being arranged on sampling gear；Described intelligent controlling device includes microcontroller, the keyboard for information input, the display screen shown for information and the out splice going splice being connected with converter；Described keyboard and photoelectric encoder all inputs with described microcontroller are connected, and described display screen and described out splice going splice are connected with the outfan of described microcontroller.
Operation principle:
When building hoist works, the sampling gear being arranged on cage is by driving driven by motor to rotate, and engages with standard knot rack synchronous during moving up and down along with cage.The distance that cage runs is converted into pulse signal transmission to microcontroller during along with sampling pinion rotation by the photoelectric encoder being arranged on sampling gear.The pulse signal that photoelectric encoder passes over is remembered and stored to microcontroller, and the numerical value of the pulse signal passed over by photoelectric encoder contrasts with beforehand through the numerical value manually debugging the designated floor being arranged in microcontroller, when two numerical value are close, microcontroller controls converter by out splice going splice, make Frequency Converter Control drive decelerating through motor near designated floor, rest in designated floor with enabling cage exactly.
When using building hoist automatic floor approaching mechanism first, need veteran expert operator manually to debug building hoist automatic floor approaching mechanism, make microcontroller record the pulse signal rested on every floor.After the setup, the operation in later stage is not required to expert operator, and common operator can pass through input through keyboard designated floor in the case of authorizing, and the comparison operation through microcontroller just can control converter and cage exactly is delivered to designated floor.Avoid the problem of the undue professional operator relying on building hoist supplying party in regular job.In building hoist running, display screen can show the floor number of input, current floor and running status in real time, make the people riding in cage can understand the whole service situation intuitively arriving building hoist, with facilitate run into special circumstances time fast reaction.
Beneficial effect:
1. the distance that cage rises can be converted to pulse signal by photoelectric encoder and pass to microcontroller by this utility model, microcontroller enables building hoist accurately automatic leveling, photoelectric encoder is selected to carry out side cage climb, it is possible to increase the langding accuracy of building hoist.
2. the keyboard in intelligent controlling device and display screen are all connected with microcontroller, by keyboard, microcontroller can be configured, the signal numerical value that typical floor is corresponding, the convenient signal numerical value that photoelectric encoder is passed over by microcontroller below and typical floor signal numerical value are compared to control building hoist flat bed to make microcontroller remember.Building hoist residing information such as floor and height in lifting process can be shown by display screen, facilitate operator to check.
3. this utility model has memory function, reduce the dependence to expert operator, when Xu Meidong building operates first, by expert operator, floor information is inputted microcontroller, avoid the situation of common operator repeated multiple times ability flat bed, reduce the work times of the electric elements such as converter, catalyst, reduce the loss of electric elements to a certain extent, add the life-span of building hoist.
Scheme two: optimize further on the basis of scheme one, described intelligent controlling device is provided with the weight sensor for measuring cage weight and for the signal lights reported to the police and buzzer, described weight sensor is connected with the input of microcontroller, and described signal lights and buzzer are connected with the outfan of microcontroller.When the signal numerical value that weight sensor passes to microcontroller is more than the maximum that setting value i.e. cage can bear, microprocessor controls buzzer and signal lights carry out sound and light alarm, intelligent controlling device makes cage stop at nearest floor band-type brake by out splice going splice control converter simultaneously, it is to avoid cage continues to run with when overweight and then the danger of cage and ground strong collision occurs.
Scheme three: optimize further on the basis of scheme two, described photoelectric encoder is mixed photoelectric encoder, and described photoelectric encoder has the pulse signal output end of two difference in functionalitys and one of them pulse signal output end is connected with converter.
The function of mixed photoelectric encoder includes the function of incremental optical-electricity encoder and the function of absolute optical encoder, equivalence can regard a mixed photoelectric encoder as and include an incremental optical-electricity encoder and an absolute optical encoder.The pulse signal output end of incremental optical-electricity encoder is only connected with the input of microcontroller, is used for realizing the transmission of story height signal.The instant rotation number of turns of sampling gear can i.e. be sampled the rotation speed of gear and be converted into pulse signal by the pulse signal output end of absolute optical encoder.The pulse signal output end of absolute optical encoder is connected with microcontroller and converter respectively, absolute optical encoder is now equivalent to the velocity sensor for measuring the cage speed of service, can test out, by the rotation speed of test sampling gear, the speed that now cage runs.When the cage speed of service is too fast, frequency signal is delivered separately to microcontroller and converter by photoelectric encoder, converter compares the frequency signal numerical value that photoelectric encoder passes over and compares with the peak frequency pre-set, when frequency signal numerical value now is more than peak frequency, the driving decelerating through motor that Frequency Converter Control is attached thereto.Microcontroller, when receiving the signal that photoelectric encoder transmits, controls converter and slows down, make the driving decelerating through motor being connected with converter, it is ensured that when the cage speed of service is too fast, drives motor to slow down in time, it is to avoid the danger that high-speed cruising brings.
Scheme four: optimize further on the basis of scheme one, conventional power supply and the stand-by power supply being connected with converter it is also associated with on described intelligent controlling device, being connected between described intelligent controlling device with conventional power supply and have the first relay, the normally-closed contact of described first relay is connected between stand-by power supply and intelligent controlling device.When the conventional power outage provided by civil power, the normally-closed contact Guan Bi of the first relay, stand-by power supply connects and starts for inverter supply, to enable building hoist as usual to use, it is to avoid have a power failure in building hoist running the danger brought and construction delay.
Scheme five: optimize further on the basis of scheme four, described stand-by power supply includes accumulator and the charging circuit being connected between accumulator and conventional power supply.When conventional power supply normally works, accumulator can be charged by conventional power supply, it is to avoid needs accumulator is taken out the trouble individually charged.
Scheme six: optimize further on the basis of scheme four, described stand-by power supply includes solaode.Make full use of the advantage that building hoist is under open-air atmosphere more, the solar energy of clean environment firendly can be made full use of by solaode, by solaode, converter can be continued power supply when the electric energy stored by accumulator is finished, enable building hoist to work continuously.
Scheme seven: optimize further on the basis of scheme three, described intelligent controlling device is additionally provided with the inflator pump being connected with microcontroller, and described inflator pump is connected with the gas cell being folded with in cage bottom.When microcontroller receive the rate signal that the absolute optical encoder as velocity sensor passes over persistently become big time, will there was a mechanical failure or during converter band-type brake failure, gas cell is quickly inflated by microprocessor controls inflator pump, make gas cell reduce the speed that cage falls, alleviate the collision loss that cage falling from high altitude is likely to result in as much as possible.
Scheme eight: optimize further on the basis of scheme seven, described gas cell is the hemispherical dome structure that Open Side Down.Gas cell is the hemispherical dome structure that Open Side Down so that it is can make full use of the buoyancy of air, slows down the speed of cage tenesmus.If gas cell is the most fully deployed when cage lands, gas cell is because horizontal folding own makes the most fully deployed gas cell have bigger elasticity, it is possible to the power that buffering cage is subject to when landing to the full extent, is reduced as far as casualties.
Scheme nine: optimize further on the basis of scheme one, described microcontroller is single-chip microcomputer.Single-chip microcomputer is conventional microcontroller, low price and use technology maturation.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of this utility model embodiment.
Fig. 2 is the scheme of installation of this utility model embodiment.
Detailed description of the invention
Below by detailed description of the invention, this utility model is described in further detail:
Reference in Figure of description includes: cage 1, intelligent controlling device 2, sampling gear 3, inflator pump 4, converter 5, gas cell 6, photoelectric encoder 7, out splice going splice 8, weight sensor 9.
As it is shown in figure 1, building hoist automatic floor approaching mechanism, the photoelectric encoder 7 including intelligent controlling device 2 and being connected with intelligent controlling device 2 respectively, weight sensor 9, inflator pump 4, conventional power supply and stand-by power supply.Wherein intelligent controlling device 2 includes microcontroller and the keyboard, display screen, signal lights and the buzzer that are connected with controller.Can input a signal into microcontroller by keyboard, signal is exported to display screen, signal lights, buzzer and inflator pump 4 by microcontroller.Signal is passed to the microcontroller in intelligent controlling device 2 by photoelectric encoder 7 and weight sensor 9, and meanwhile, signal is passed to converter 5 by photoelectric encoder 7, and signal is passed to converter 5 by out splice going splice 8 by microcontroller.
Conventional power supply is the alternating current provided by civil power, is connected and has the first relay between intelligent controlling device 2 with conventional power supply, and the normally-closed contact of the first relay is connected between stand-by power supply and intelligent controlling device 2.When the conventional power outage provided by civil power, the normally-closed contact Guan Bi of the first relay, stand-by power supply connects and starts to power for converter 5, enabling building hoist as usual to use, it is to avoid have a power failure in building hoist running the danger brought.
Stand-by power supply includes accumulator and the charging circuit being connected between accumulator and conventional power supply.When conventional power supply normally works, accumulator can be charged by conventional power supply, it is to avoid needs accumulator is taken out the trouble individually charged.Stand-by power supply includes solaode, is connected and has the second relay between accumulator and the outfan of stand-by power supply, and the normally-closed contact of the second relay is connected between the outfan of stand-by power supply and solaode.Make full use of the advantage that building hoist is under open-air atmosphere more, the solar energy of clean environment firendly can be made full use of by solaode, by solaode, intelligent controlling device 2 and converter 5 can be continued power supply when the electric energy stored by accumulator is finished, enable the operation of building hoist to be carried out continuously.Connect in the port of the outfan that stand-by power supply is connected with converter 5 and have inverter.Accumulator and solaode reconnect this outfan after first passing through inverter.
Microcontroller is single-chip microcomputer.Photoelectric encoder 7 is hybrid rotary photoelectric encoder 7, and hybrid rotary photoelectric encoder 7 is connected by flexible coupling with sampling gear 3.Hybrid rotary photoelectric encoder 7 makes the precision of building hoist automatic floor approaching mechanism be improved by selecting the sampling gear 3 of degree of precision, when using the mixed photoelectric encoder 7 of full accuracy, within the langding accuracy of building hoist automatic floor approaching mechanism can reach positive and negative 2mm.
Mixed photoelectric encoder 7 has the pulse signal output end of two difference in functionalitys and one of them pulse signal output end is connected with converter 5.The function of mixed photoelectric encoder 7 includes function and the function of absolute optical encoder 7 of incremental optical-electricity encoder 7.Incremental optical-electricity encoder 7 can be used for testing the accumulation height of floor with pile-up pulse signal.Absolute optical encoder 7 can not pile-up pulse signal, but can test sampling gear 3 real-time rotating speed.The pulse signal output end with incremental optical-electricity encoder 7 function is only connected with the input of microcontroller, is used for realizing the transmission of story height signal.There is the pulse signal output end of absolute optical encoder 7 function the instant rotation number of times of sampling gear 3 can i.e. be sampled the rotation speed of gear 3 and be converted into pulse signal.The pulse signal output end with absolute optical encoder 7 function is connected with microcontroller and converter 5 respectively, absolute optical encoder 7 is now equivalent to velocity sensor, can test out, by the rotation speed of test sampling gear 3, the speed that now cage 1 runs.
When cage 1 speed of service is too fast, or fall danger time, sampling gear 3 quick rotation, make and sample photoelectric encoder 7 that gear 3 is connected by shaft coupling pulse signal is delivered separately to microcontroller and converter 5, converter 5 compares the equivalent frequency signal numerical value that photoelectric encoder 7 passes over and compares with the peak frequency pre-set, when sampling in gear 3 rotational frequency now is more than converter 5 peak frequency arranged, converter 5 controls the driving decelerating through motor being attached thereto.Simultaneously, microcontroller is when receiving the pulse signal that photoelectric encoder 7 transmits, and microcontroller controls converter 5 by out splice going splice 8 and slows down, it is ensured that cage 1 is when the speed of service is too fast, converter 5 can control to drive motor to slow down in time, it is to avoid the danger that high-speed cruising brings.
As in figure 2 it is shown, intelligent controlling device 2 is arranged in cage 1；Photoelectric encoder 7 is connected with intelligent controlling device 2 by running through the wire of cage 1, photoelectric encoder 7 is arranged on driving plate, it is connected with sampling gear 3 by rotating shaft, sampling gear 3 engages with the tooth bar being fixed on standard knot, in building hoist running, the run signal of building hoist is gathered by sampling gear 3, pulse signal is converted to further by photoelectric encoder 7, intelligent controlling device 2 respective terminal is inputted by PG card, the pulse signal numerical value of input is constantly compared by intelligent controlling device 2 with the pulse signal numerical value corresponding to operator's designated floor, when both are close, output reduce-speed sign, it is final when both are identical, output stopping signal, building hoist steadily rests in designated floor.
Pin type weight sensor 9 is arranged on the top of cage 1, and driving arm and cage 1 are coupled together by pin type weight sensor 9, for measuring tote and the gross weight of occupant in cage 1；Driving arm is positioned at cage 1 placed on top, is connected with cage 1 by pin type weight sensor 9；Drive motor to be fixed on driving arm, engaged with the tooth bar on standard knot guide rail by the gear on speed reducer output shaft, thus drive cage 1 to rise or fall；Converter 5 is arranged in the switch board of cage 1 inwall, converter 5 is connected by wire with driving motor, converter 5 is connected with intelligent controlling device 2 by out splice going splice 8, and the buzzer being connected with microcontroller and signal lights are all arranged on the shell of intelligent controlling device 2.When weight sensor 9 passes to the signal numerical value of microcontroller more than the setting value maximum that i.e. cage 1 can bear of microcontroller, or the pulse signal output end with absolute optical encoder 7 passes to the signal numerical value of microcontroller when running, more than the i.e. cage 1 of setting value, the maximal rate that can bear, microprocessor controls buzzer rings, the flicker of control signal lamp is reported to the police.Meanwhile, the microcontroller in intelligent controlling device 2 controls converter 5 by out splice going splice 8 and slows down, and makes cage 1 can stop at nearest floor band-type brake.Avoid cage 1 to continue to run with when overweight and then irremediable loss occurs.
Inflator pump 4 is positioned at the bottom of cage 1, is connected with intelligent controlling device 2 by wire.Gas cell 6 is hinged on the bottom surface of cage 1 and wraps inflator pump 4.Gas cell 6 is the convex arc bowl structure that Open Side Down after being full of gas, and when gas cell 6 is not deployed, gas cell 6 is folded in the bottom of cage 1 with horizontal creases.Gas cell 6 is the hemispherical dome structure that Open Side Down so that it is can make full use of the buoyancy of air, slows down the speed of cage 1 tenesmus.Even if gas cell 6 is the most fully deployed when cage 1 lands, but the horizontal folding of gas cell 6 own makes the most fully deployed gas cell 6 have bigger elasticity, it is possible to the power that buffering cage 1 is subject to when landing to the full extent, is reduced as far as casualties.Gas cell 6 is wear-resistant material, it is possible to withstand the abrasion of basic rack without leaking gas.
When building hoist lifts, sampling gear 3 engages with the standard knot rack synchronous as track.Elevator range ability is converted into pulse signal transmission and carries out store-memory to the microcontroller in intelligent controlling device 2 by photoelectric encoder 7.This utility model has MANUAL CONTROL mode and automatic control mode.When MANUAL CONTROL mode, carried out floor stop completely by rule of thumb by operator, generally after transferring to new job site every time or newly installed after, enable manual mode.Manually building hoist automatic floor approaching mechanism is debugged by professional operator, i.e. operator first pass through display screen and read the number of pulses of photoelectric encoder 7 correspondence when stopping every floor, then are input in microcontroller as the setting value of corresponding floor by this numerical value by keyboard.Make intelligent controlling device 2 have self-learning function, by the umber of pulse of microcontroller store-memory photoelectric encoder 7, make building hoist automatic floor approaching mechanism record the position of every first floor.
Under automatic control mode, when operator inputs the floor number of designated floor on keyboard, the level number of destination and the level number of current floor will be shown respectively by display screen, after microcontroller judges the distance of existing position and appointment position by internal comparison operation, control converter 5 and drive motor even running, until accurately smoothly resting in designated floor.
In building hoist running, the display screen of intelligent controlling device 2 can show the floor number of input, current floor, running status, current door state, spacing state, malfunction, failure code etc. in real time.Connect voice module if peripheral, then can be that driver provides voice message, as reminded current floor, door state, running status etc..
Intelligent controlling device 2 is communicated with converter 5 by RS485 mode, intelligent controlling device 2 is by comparing the umber of pulse of actual pulse number and designated floor, converter 5 is issued instructions to after compared result is analyzed judging, automatically control converter 5 acceleration or deceleration to run, when will near designated floor time, intelligent controlling device 2 will send deceleration instruction and run until steadily stopping to converter 5, control decelerating through motor.
The distance that cage 1 rises can be converted to pulse signal by photoelectric encoder 7 and pass to microcontroller by this utility model, microcontroller controls converter 5 by out splice going splice 8, make converter 5 control to drive motor, enable building hoist accurately to stop and put in place, automatic leveling.Converter 5 is connected with microcontroller by out splice going splice 8, photoelectric encoder 7 is connected on the sampling gear 3 that rotates together with driving motor, pulse signal that microcontroller inputs according to photoelectric encoder 7 and operator's position signalling by every floor of input through keyboard, including braking Distance Calculation when converter 5 can be slowed down, enable building hoist accurately flat bed.
All orders of the single-chip microcomputer STC89C52 that this utility model is used are disclosure of that on its technical manual.
Above is only embodiment of the present utility model, in scheme, the known general knowledge such as concrete structure and characteristic too much describes at this, one skilled in the art know the applying date or priority date before all of ordinary technical knowledge of utility model art, all of prior art in this field can be known, and there is the ability of normal experiment means before applying this date, one skilled in the art can be under the enlightenment that the application is given, improve in conjunction with self-ability and implement this programme, some typical known features or known method should not become one skilled in the art and implement the obstacle of the application.Should be understood that; for a person skilled in the art, on the premise of without departing from this utility model structure, it is also possible to make some deformation and improvement; these also should be considered as protection domain of the present utility model, and these are all without affecting effect and the practical applicability that this utility model is implemented.The protection domain that this application claims should be as the criterion with the content of its claim, and the detailed description of the invention in description etc. records the content that may be used for explaining claim.
Claims (9)
1. building hoist automatic floor approaching mechanism, it is characterised in that: include the intelligent controlling device being arranged in cage and the photoelectric encoder being arranged on sampling gear；Described intelligent controlling device includes microcontroller, the keyboard for information input, the display screen shown for information and the out splice going splice being connected with converter；Described keyboard and photoelectric encoder all inputs with described microcontroller are connected, and described display screen and described out splice going splice are connected with the outfan of described microcontroller.
Building hoist automatic floor approaching mechanism the most according to claim 1, it is characterized in that: described intelligent controlling device is provided with the weight sensor for measuring cage weight and for the signal lights reported to the police and buzzer, described weight sensor is connected with the input of microcontroller, and described signal lights and buzzer are connected with the outfan of microcontroller.
Building hoist automatic floor approaching mechanism the most according to claim 2, it is characterized in that: described photoelectric encoder is mixed photoelectric encoder, described photoelectric encoder has the pulse signal output end of two difference in functionalitys and one of them pulse signal output end is connected with converter.
Building hoist automatic floor approaching mechanism the most according to claim 1, it is characterized in that: on described intelligent controlling device, be also associated with conventional power supply and the stand-by power supply being connected with converter, being connected between described intelligent controlling device with conventional power supply and have the first relay, the normally-closed contact of described first relay is connected between stand-by power supply and intelligent controlling device.
Building hoist automatic floor approaching mechanism the most according to claim 4, it is characterised in that: described stand-by power supply includes accumulator and the charging circuit being connected between accumulator and conventional power supply.
Building hoist automatic floor approaching mechanism the most according to claim 4, it is characterised in that: described stand-by power supply includes solaode.
Building hoist automatic floor approaching mechanism the most according to claim 3, it is characterised in that: described intelligent controlling device is additionally provided with the inflator pump being connected with microcontroller, and described inflator pump is connected with the gas cell being folded with in cage bottom.
Building hoist automatic floor approaching mechanism the most according to claim 7, it is characterised in that: described gas cell is the hemispherical dome structure that Open Side Down.
Building hoist automatic floor approaching mechanism the most according to claim 1, it is characterised in that: described microcontroller is single-chip microcomputer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620109718.9U CN205500477U (en) | 2016-02-03 | 2016-02-03 | Construction hoist automatic leveling device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620109718.9U CN205500477U (en) | 2016-02-03 | 2016-02-03 | Construction hoist automatic leveling device |
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| CN205500477U true CN205500477U (en) | 2016-08-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108584574A (en) * | 2018-07-07 | 2018-09-28 | 浙江易控电子科技有限公司 | The method that frequency converter, ups system, PG cards, encoder jointly control elevator |
| CN114249195A (en) * | 2021-12-20 | 2022-03-29 | 海特尔机电工程技术（马鞍山）有限公司 | Control system for lifting electromechanical equipment |
-
2016
- 2016-02-03 CN CN201620109718.9U patent/CN205500477U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108584574A (en) * | 2018-07-07 | 2018-09-28 | 浙江易控电子科技有限公司 | The method that frequency converter, ups system, PG cards, encoder jointly control elevator |
| CN108584574B (en) * | 2018-07-07 | 2020-08-28 | 浙江易控电子科技有限公司 | Method for jointly controlling elevator by frequency converter, UPS system, PG card and encoder |
| CN114249195A (en) * | 2021-12-20 | 2022-03-29 | 海特尔机电工程技术（马鞍山）有限公司 | Control system for lifting electromechanical equipment |
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