CN212450159U - Wind power tower cylinder exempts from to climb ware safety inspection device that marchs - Google Patents
Wind power tower cylinder exempts from to climb ware safety inspection device that marchs Download PDFInfo
- Publication number
- CN212450159U CN212450159U CN202020649810.0U CN202020649810U CN212450159U CN 212450159 U CN212450159 U CN 212450159U CN 202020649810 U CN202020649810 U CN 202020649810U CN 212450159 U CN212450159 U CN 212450159U
- Authority
- CN
- China
- Prior art keywords
- module
- electrically connected
- relay
- main controller
- relay module
- Prior art date
- Legal status (The legal status 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 status listed.)
- Active
Links
Images
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The utility model discloses a wind power tower cylinder exempts from to climb ware safety inspection device that marcs for when solving among the prior art operating personnel and outside emergence string rubbing, can't ensure operating personnel safe problem in the passageway. The method comprises the following steps: the A/D conversion module and the input relay module are electrically connected with the main controller, and the power supply module is respectively electrically connected with the weighing sensor, the A/D conversion module, the main controller, the input relay module and the wireless communication module; the weighing sensor is electrically connected with the A/D conversion module; the input relay module is electrically connected with the wireless communication module; the anti-scratch protection device has the beneficial effects that after the key detection device is installed on the climbing-free device, the anti-scratch protection device has an anti-scratch protection function, when various parts of a body, a safety belt or a work clothes and the like are hung and rubbed with the outside in the ascending or descending process of an operator, the climbing-free device automatically detects and judges the blocked condition within 2 seconds and stops running, and the safety of the operator in a channel is ensured.
Description
Technical Field
The utility model relates to an exempt from to climb ware safety control system technical field, especially relate to a wind power tower section of thick bamboo exempts from to climb ware safety inspection device that advances.
Background
The ware is exempted from to climb by wind power tower cylinder mainly used wind power tower cylinder inside transport people and the lifting means of thing, exempts from to climb the ware and mainly includes: the device comprises a lifting trolley, a transmission mechanism, a control unit, a driving unit, an anti-falling device, a remote control device, a guide rail, a traction steel wire rope, a safety steel wire rope and the like. The aluminum alloy guide rails (single rail and double rails) are used as guide, the multi-rolling wheel set connection is realized, the double steel cables are lifted, and the operation is safe and stable; the PLC and the frequency converter are used as control cores, and the functions of remote control, inching control, automatic operation and the like are realized.
When operating personnel need rise to a tower section of thick bamboo upper strata, need dress multiple protective equipment, carry the instrument, when each position of in-process health, safety belt or work clothes etc. and outside platform or other objects take place to hang and rub very easily rising or descending, only rely on anti-falling device still can place operating personnel in dangerous, operating personnel's safety, the safety of the object of transporting can't guarantee.
Disclosure of Invention
An embodiment of the utility model provides a wind power tower cylinder exempts from to climb ware safety inspection device that marchs for when solving among the prior art operating personnel and outside emergence string rubbing, can't ensure the safe problem of operating personnel in the passageway.
The embodiment of the utility model provides a wind power tower cylinder exempts from to climb ware safety inspection device that marchs, include: the device comprises a main controller, a weighing sensor, an A/D conversion module, a power supply module, an input relay module and a wireless communication module; the A/D conversion module and the input relay module are electrically connected with the main controller, and the power supply module is respectively electrically connected with the weighing sensor, the A/D conversion module, the main controller, the input relay module and the wireless communication module; the weighing sensor is electrically connected with the A/D conversion module; the input relay module is electrically connected with the wireless communication module;
the input relay module comprises an ascending relay module, a descending relay module, a fault relay module and a starting relay module, the ascending relay module, the descending relay module, the fault relay module and the starting relay module are all electrically connected with the main controller, and the main controller is electrically connected with the key module.
Preferably, the weighing sensor is installed below the pedal of the climbing-free device, the A/D conversion module is an HX711 module, and the HX711 module is electrically connected with the main controller through an HX711 serial module.
Preferably, the method further comprises the following steps: the sound and light alarm module and the real-time clock module; the sound and light alarm module and the real-time clock module are electrically connected with the main controller and the power module, and the real-time clock module is electrically connected with the display screen.
The preferred, the relay module that rises in the input relay module, decline relay module, trouble relay module and start relay module all are optical coupling isolation relay, and the relay module that rises, decline relay module, trouble relay module and start relay module pass through relay binding post and are connected with wireless communication module electricity.
Preferably, the key module comprises an ascending key, a descending key, a fault key and a starting key, which are electrically connected with the main controller through key interfaces respectively.
Preferably, the power supply module includes: the direct-current charging power supply is sequentially connected with the reverse connection prevention module, the first voltage drop converter and the second voltage drop converter, the first voltage drop converter supplies power after passing through the first anti-static module, and the second voltage drop converter supplies power through the second anti-static module.
Preferably, the dc charging power supply is a 12V dc charging power supply, the first voltage drop converter is an MP2359 module, the output voltage is a 5V dc voltage, the second voltage drop sensor is an AM117 module, the output voltage is a 3.3V dc voltage, the reverse-connection prevention module is a bridge rectifier type reverse-connection prevention protection circuit, the output end of the reverse-connection prevention module is connected with the input end of the MP2359 module, the first and second static-prevention modules are both transient suppression diodes, the output end of the MP2359 module is connected in parallel with a first transient suppression diode, and the AM117 module is connected in parallel with a second transient suppression diode.
Preferably, wind power tower cylinder exempts from to climb ware safety inspection device of marcing still includes: the control panel reset key is connected with the main controller reset pin through a reset circuit.
Preferably, the main controller is an STM32F407ZGT6 module.
The utility model discloses beneficial effect includes: the device for detecting the advancing safety of the climbing-free device of the wind power tower cylinder is provided with an independent weight detection system, has the functions of recording weight and calibrating scale, displays the actual load weight through a liquid crystal display screen, weighs the load before the vehicle body is started, and gives out sound and light alarm prompts when the vehicle is overloaded and stops running. An independent programmable intelligent controller is equipped for collecting and processing signals of ascending, descending, stopping, emergency stopping, electronic weighing, fault alarming, load calculating and judging and the like, and programmable input and output nodes are reserved for function expansion. The lifting trolley has the anti-scratch protection function, when each part of the body, a safety belt or a work clothes and the like of an operator rise or fall to be hung and rubbed with the outside, the automatic detection in 2 seconds of the climbing-free device judges the blocked condition and stops running, and the safety of the operator in a channel is ensured.
Drawings
FIG. 1 is a schematic structural diagram of a wind power tower crawling-free device traveling safety detection device in the embodiment of the invention;
FIG. 2 is a detailed structural schematic diagram of a wind power tower crawling-free device traveling safety detection device in the embodiment of the invention;
FIG. 3 is a detailed circuit diagram of a power module according to an embodiment of the invention;
FIG. 4 is a schematic diagram of the circuit of the up relay (down relay, start relay, fault relay) in the output relay module in an embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a first droop module in the power module according to an embodiment of the present invention;
FIG. 6 is a schematic circuit diagram of a second droop module in the circuit module according to an embodiment of the present invention;
FIG. 7 is a schematic circuit diagram of an anti-static module in the power module according to the embodiment of the invention;
fig. 8 is a schematic diagram of a reset circuit in the power module according to the embodiment of the invention.
Detailed Description
In order to provide an implementation scheme of a crawler-free control system which ensures the life safety of operators, prevents the operators from being hung and runs safely, the preferred embodiment of the invention is described below by combining the attached drawings of the specification.
Referring to fig. 1-2, an embodiment of the present invention provides a wind power tower crawling-free device traveling safety detection apparatus, including: the device comprises a main controller 1, a weighing sensor 2, an A/D conversion module 3, a power supply module 4, an output relay module 5 and a wireless communication module 6; the A/D conversion module 3 and the output relay module 5 are electrically connected with the main controller 1, and the power supply module 4 is respectively electrically connected with the weighing sensor 2, the A/D conversion module 3, the main controller 1, the output relay module 5 and the wireless communication module 6; the weighing sensor 2 is electrically connected with the A/D conversion module 3; the output relay module 5 is electrically connected to the wireless communication module 6.
The A/D conversion module 3 is used for receiving current weight data acquired by the weighing sensor 2, processing the current weight data and sending the processed current weight data to the main controller 1; weighing sensor 2 installs in exempting from to climb ware running-board below for with current weight data transmission to A/D conversion module 3, A/D conversion module 3 is HX711 module 301, and HX711 module 301 passes through HX711 serial port module 302 and is connected with main control unit 1 electricity. The weighing sensor 2 is a bridge type piezoresistor sensor, after a human body stands on a pedal, the weight of the human body is converted into an analog voltage signal, the analog voltage signal is converted into a digital signal by the A/D conversion module 3HX711, the obtained digital quantity is in direct proportion to the weight of the human body, and the initial weight of the climbing-free device when the human body stands is recorded.
The main controller 1 is an STM32F407ZGT6 chip and is configured to receive current weight data processed by the a/D conversion module 3, determine whether the current weight data is higher than a first set weight threshold or lower than a second set weight threshold, determine whether a fault instruction needs to be sent according to a determination result, send the fault instruction to the output relay module 5 when the fault instruction needs to be sent, and the main controller 1 is configured to receive an instruction for starting the climb-free device, ascending, descending or fault sent by the key module.
After receiving the weight information sent by the A/D converter, the main controller 1 determines a set weight threshold value through processing, the climbing-free device in the embodiment of the invention can convey people or goods within 120kg, and through multiple tests, the weight of the people or goods measured in a static state is added with 15kg to serve as a first set weight threshold value for subsequent comparison, and 20kg to serve as a second set weight threshold value for subsequent comparison; the main controller 1 determines that a fault instruction needs to be sent and sends the fault instruction to the output relay module 5; and comparing the weight with a second set weight threshold, judging that the operator is likely to be hung and rubbed when the weight is lower than the second set weight threshold, standing on the climbing-free device to be in a weightless state, sending a fault instruction to the output relay module 5 by the main controller 1, and if the weight is detected to be less than 10KG, in order to prevent misoperation, the climbing-free device cannot normally operate.
The output relay module 5 is used for sending a starting, ascending, descending or fault instruction to the PLC controller 7 through the wireless communication module 6, and the PLC controller 7 controls the climbing-free device to brake; the output relay module 5 comprises an ascending relay module 501, a descending relay module 502, a fault relay module 503 and a starting relay module 504, the ascending relay module 501, the descending relay module 502, the fault relay module 503 and the starting relay module 504 are all optical coupling isolation relays, the ascending relay module 501, the descending relay module 502, the fault relay module 503 and the starting relay module 504 are electrically connected with the main controller 1, the ascending relay module 501, the descending relay module 502, the fault relay module 503 and the starting relay module 504 are electrically connected with the wireless communication module 6 through relay wiring terminals 505, the key module comprises an ascending key 1102, a descending key 1103, a fault key 1104 and a starting key 1105, and the key modules are electrically connected with the main controller through key interfaces 1101 respectively.
The output relay module 5 sends a high level to the wireless communication module 6 through the fault optical coupling isolation relay after receiving the fault command of the main controller 1, the wireless communication module 6 sends the fault command to the ground PLC controller 7, and the PLC controller 7 controls the climbing-free device to brake. Output relay module 5 also can be operated through manual, output relay module 5 includes that 4 ways optical coupling isolation relay constitutes, each way function exempts from to climb the ware for control respectively and starts, rise, descend, trouble (stopping), after weighing, operating personnel can manually press start button 1105, start button 1105 is connected with main control unit 1, main control unit 1 receives the instruction after, through serial ports data's analysis and button state, carry out comprehensive judgement, send a high level to wireless communication module 6 through output relay module 5, wireless communication module 6 sends start command to PLC controller 7, be equivalent to opening exempts from to climb ware control system switch, adopt the same mode after that, the ware is ascended or descends to the manipulation exempting from to climb. The four-way optical coupling isolation RELAY has the same circuit structure and is respectively connected to different interfaces of a main controller 1, as shown in a circuit figure 4, a foot 1 of a TLP521 optical coupling is connected with a power supply, a foot 2 of the TLP521 optical coupling isolation RELAY is connected with a corresponding foot pin of the main controller 1, a foot RELAY2-IO RELAY connecting terminal 505 of an SRD-05VDC-SL-C small power RELAY is connected to an input end of a wireless communication module 6, RELAYs with other functions are identical to the circuit structure, and therefore the description is omitted.
The PLC 7 is used for receiving a fault instruction, braking the climbing-free device, receiving a starting instruction, starting the climbing-free device, receiving a rising instruction, controlling the climbing-free device to rise, and receiving a falling instruction, and controlling the climbing-free device to fall.
Referring to fig. 3, 5 to 7, the power module 4 includes: the dc charging power source 401 is sequentially connected to the reverse connection preventing module 402, the first voltage drop converter 403, and the second voltage drop converter 404, wherein the first voltage drop converter 403 supplies power after passing through the first anti-static module 405, and the second voltage drop converter 404 supplies power through the second anti-static module 406. The direct-current charging power supply 401 is a 12V direct-current charging power supply 401, the first voltage drop converter 403 is an MP2359 module, the output voltage is 5V direct-current voltage, the second voltage drop sensor is an AM117 module, the output voltage is 3.3V direct-current voltage, the reverse connection prevention module 402 is a rectifier bridge type reverse connection prevention protection circuit, the output end of the reverse connection prevention module 402 is connected with the input end of the MP2359 module, the first static prevention module 405 and the second static prevention module 406 are both transient suppression diodes, the output end of the MP2359 module is connected with a first transient suppression diode in parallel, and the AM117 module is connected with a second transient suppression diode in parallel. The 12V direct current charging power supply 401 is connected to a left side socket JP2, a rectifier bridge type reverse connection prevention protection circuit is connected to the rear side, specifically, the ground, the diode VD5 (conduction direction), the diode VD4 (conduction direction), is connected to the power input end of the MP2359 chip, the ground, the diode VD3 (conduction direction), the diode VD2 (conduction direction), is connected to the power input end of the MP2359 chip, only one path inputs level to the MP2359 no matter whether the polarity is positive or negative when the power is connected, in the whole control circuit, the voltage of 5V and the voltage of 3.3V are needed, the voltage of 12V is reduced to 5V through the MP2359, the MP2359 is direct current to direct current, the conversion efficiency is about 90%, and the voltage of 5V is reduced to 3.3V through the AM117 module, so that the conversion efficiency is higher, the heat generation is small, and the service life of the power supply module 4 is long. The anti-static module is realized through transient suppression diode SMBJ, can effectively suppress static, prevents that static from puncturing control panel components and parts.
Wind power tower cylinder exempts from to climb ware safety inspection device of marcing still includes: the sound and light alarm module 8 and the real-time clock module 9; the sound and light alarm module 8 and the real-time clock module 9 are both electrically connected with the main controller 1 and the power module 4, and the real-time clock module 9 is electrically connected with the display screen 10. The sound and light alarm module 8 circuit is realized by adopting a common diode and a buzzer circuit, and the RTC real-time clock module 9 is used for reporting the current time to the display screen 10 for displaying.
Wind power tower cylinder exempts from to climb ware safety inspection device of marcing still includes: and a control panel RESET key SW1, wherein one end of the control panel RESET key RESET is connected with a RESET pin of the main controller 1 through a RESET circuit 11. The control panel reset key is used for manually resetting the main controller 1 and resetting after the program is downloaded.
The function and the use method of the climbing-free device advancing safety detection device for the wind power tower cylinder in the embodiment of the invention are described below.
According to the device for detecting the advancing safety of the climbing-free device of the wind power tower, after the climbing-free device is electrified, a main controller 1 and a peripheral circuit are initialized, an operator stands on a pedal of the climbing-free device, presses a starting button 1105, and sends a starting instruction to a PLC (programmable logic controller) 7 through a starting relay via a wireless communication module 6, namely, a switch of the climbing-free device is started, the device adopts STM32F407ZGT6 as a main control chip, an HX711 high-precision 24-bit A/D conversion module 3 starts to collect human body weight information returned by a weighing sensor 2, the main controller 1 sends a reading command via a serial port, the HX711 responds and returns the collected human body weight information to the main controller 1, after receiving response data of the HX711, the main controller 1 memorizes the human body weight information after analyzing, if the actual weight of the human body is 70kg, and determines a first set weight threshold value of 85kg, and adds 15kg to the actual weight, determining that the second set weight threshold is 20kg, pressing a lifting button, judging the received real-time weight information, the first set weight threshold 85kg and the second set weight threshold 20kg by the lifting relay after the lifting relay receives the instruction, judging that an operator on the climbing-free device is hung outside when the measured real-time weight is greater than the first set weight threshold 85kg by the main controller 1 in the traveling process, sending a fault instruction after judging that the operator is likely to be hung outside when the climbing-free device ascends, sending a high level to the wireless communication module 6 and transmitting the high level to the PLC controller 7 through the wireless communication module 6, and quickly braking the climbing-free device after the PLC controller 7 receives the high level to avoid the operator from falling; when the measured real-time weight is less than the second set weight threshold value of 20kg, it is judged that an operator on the climbing-free device is possibly hung by the outside when descending, a fault instruction is sent out, the acousto-optic alarm module 8 is started to give an alarm to remind, the instruction is received through the fault relay, a high level is sent to the wireless communication module 6 and is transmitted to the PLC controller 7 through the wireless communication module 6, the climbing-free device is rapidly braked after being received by the PLC controller 7, the falling of the operator is avoided, and protective measures are effectively taken.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. The utility model provides a wind power tower cylinder exempts from to climb ware safety inspection device that marchs which characterized in that includes: the device comprises a main controller, a weighing sensor, an A/D conversion module, a power supply module, an input relay module and a wireless communication module; the A/D conversion module and the input relay module are electrically connected with the main controller, and the power supply module is respectively electrically connected with the weighing sensor, the A/D conversion module, the main controller, the input relay module and the wireless communication module; the weighing sensor is electrically connected with the A/D conversion module; the input relay module is electrically connected with the wireless communication module;
the input relay module comprises an ascending relay module, a descending relay module, a fault relay module and a starting relay module, the ascending relay module, the descending relay module, the fault relay module and the starting relay module are all electrically connected with the main controller, and the main controller is electrically connected with the key module.
2. The device for detecting the travel safety of the climbing-free device of the wind power tower as claimed in claim 1, wherein the weighing sensor is installed below a pedal of the climbing-free device, the a/D conversion module is an HX711 module, and the HX711 module is electrically connected with the main controller through an HX711 serial module.
3. The wind tower crawler-free travel safety detection apparatus as recited in claim 1, further comprising: the sound and light alarm module and the real-time clock module; the sound and light alarm module and the real-time clock module are electrically connected with the main controller and the power module, and the real-time clock module is electrically connected with the display screen.
4. The device for detecting the safety of the wind tower during the traveling process of the crawler-free device as claimed in claim 1, wherein the ascending relay module, the descending relay module, the fault relay module and the starting relay module in the input relay module are all optical coupling isolation relays, and the ascending relay module, the descending relay module, the fault relay module and the starting relay module are electrically connected with the wireless communication module through relay terminals.
5. The device for detecting the traveling safety of the climbing-free device of the wind power tower as claimed in claim 1, wherein the key module comprises an ascending key, a descending key, a fault key and a starting key, which are electrically connected with the main controller through key interfaces respectively.
6. The wind tower crawler-free travel safety detection apparatus as recited in claim 1, wherein the power module comprises: the direct-current charging power supply is sequentially connected with the reverse connection prevention module, the first voltage drop converter and the second voltage drop converter, the first voltage drop converter supplies power after passing through the first anti-static module, and the second voltage drop converter supplies power through the second anti-static module.
7. The device for detecting the traveling safety of the crawler-free wind tower of claim 6, wherein the DC charging power supply is a 12V DC charging power supply, the first voltage drop converter is an MP2359 module, the output voltage is a 5V DC voltage, the second voltage drop sensor is an AM117 module, the output voltage is a 3.3V DC voltage, the reverse connection prevention module is a rectifier bridge type reverse connection prevention protection circuit, the output end of the reverse connection prevention module is connected with the input end of the MP2359 module, the first static prevention module and the second static prevention module are both transient suppression diodes, the output end of the MP2359 module is connected with a first transient suppression diode in parallel, and the AM117 module is connected with a second transient suppression diode in parallel.
8. The wind tower crawler-free travel safety detection apparatus as recited in claim 1, further comprising: the control panel reset key is connected with the main controller reset pin through a reset circuit.
9. The device for detecting the traveling safety of the climbing-free device of the wind tower as claimed in claim 1, wherein the main controller is an STM32F407ZGT6 module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020649810.0U CN212450159U (en) | 2020-04-26 | 2020-04-26 | Wind power tower cylinder exempts from to climb ware safety inspection device that marchs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020649810.0U CN212450159U (en) | 2020-04-26 | 2020-04-26 | Wind power tower cylinder exempts from to climb ware safety inspection device that marchs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212450159U true CN212450159U (en) | 2021-02-02 |
Family
ID=74469263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020649810.0U Active CN212450159U (en) | 2020-04-26 | 2020-04-26 | Wind power tower cylinder exempts from to climb ware safety inspection device that marchs |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212450159U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113716424A (en) * | 2021-07-30 | 2021-11-30 | 华电电力科学研究院有限公司 | Wind power tower cylinder climbing-free device traveling safety detection method |
-
2020
- 2020-04-26 CN CN202020649810.0U patent/CN212450159U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113716424A (en) * | 2021-07-30 | 2021-11-30 | 华电电力科学研究院有限公司 | Wind power tower cylinder climbing-free device traveling safety detection method |
| CN113716424B (en) * | 2021-07-30 | 2022-12-20 | 华电电力科学研究院有限公司 | Wind power tower cylinder climbing-free device traveling safety detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104944245A (en) | Elevator state information collecting device | |
| CN201587769U (en) | Overload protecting device of construction hoist | |
| CN212450159U (en) | Wind power tower cylinder exempts from to climb ware safety inspection device that marchs | |
| CN111606259B (en) | Wind power tower cylinder exempts from to climb ware safety inspection device that marchs | |
| CN209765303U (en) | attached lifting scaffold electrical control device | |
| CN107352343A (en) | A kind of monitoring self-interacting type lift appliance in real time | |
| CN111675063A (en) | Elevator traction machine fault determination method and system based on current monitoring technology | |
| CN212558958U (en) | Elevator traction machine fault determination system based on current monitoring technology | |
| CN204778129U (en) | Elevator state information collection system | |
| CN212198008U (en) | Elevator fault brake release rescue system with acousto-optic prompt | |
| CN201924579U (en) | Safety protection device for attached lifting scaffolds | |
| CN216713769U (en) | Hanging basket working platform | |
| CN108483160A (en) | A kind of elevator monitoring system based on Internet of Things | |
| CN206457132U (en) | A kind of elevator faults rescue system of automatic alarm | |
| CN215249154U (en) | Safe operation monitoring device suitable for gantry crane mechanical equipment | |
| CN111891868A (en) | Elevator monitoring system and method based on Internet of things | |
| CN210915110U (en) | Safety control system of hydraulic lifting platform | |
| CN107915111A (en) | A kind of passenger behavior monitoring method and device | |
| CN210133786U (en) | Portable elevator protection switch and safety loop state detection device | |
| CN113291940A (en) | Elevator weighing device based on Internet of things technology and debugging method | |
| CN108516432A (en) | A kind of elevator reparing maintenance system based on Internet of Things | |
| CN217555516U (en) | Elevator detection alarm device | |
| JPH02231263A (en) | Slip-off position display device in transporting equipment | |
| CN215287734U (en) | Crane no-load operation safety protection device | |
| CN110626976A (en) | Safety control system of hydraulic lifting platform |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |