CN114537547A - Elevator guide rail straightness and depth of parallelism automated inspection mechanism adsorb clamping device - Google Patents
Elevator guide rail straightness and depth of parallelism automated inspection mechanism adsorb clamping device Download PDFInfo
- Publication number
- CN114537547A CN114537547A CN202210138249.3A CN202210138249A CN114537547A CN 114537547 A CN114537547 A CN 114537547A CN 202210138249 A CN202210138249 A CN 202210138249A CN 114537547 A CN114537547 A CN 114537547A
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- wheel
- guide rail
- universal ball
- clamping
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- 238000007689 inspection Methods 0.000 title claims description 4
- 238000001514 detection method Methods 0.000 claims abstract description 66
- 238000001179 sorption measurement Methods 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000036316 preload Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D57/00—Vehicles characterised by having other propulsion or other ground- engaging means than wheels or endless track, alone or in addition to wheels or endless track
- B62D57/02—Vehicles characterised by having other propulsion or other ground- engaging means than wheels or endless track, alone or in addition to wheels or endless track with ground-engaging propulsion means, e.g. walking members
- B62D57/024—Vehicles characterised by having other propulsion or other ground- engaging means than wheels or endless track, alone or in addition to wheels or endless track with ground-engaging propulsion means, e.g. walking members specially adapted for moving on inclined or vertical surfaces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention provides an adsorption clamping device of an automatic detection mechanism for perpendicularity and parallelism of an elevator guide rail. The distance between the clamping wheels can be adjusted by adjusting the predicted bolt, the guide rail can adapt to guide rails with different sizes, and enough friction force can be provided to prevent slipping. The universal ball guide wheels are positioned at two ends of the vehicle body, and when the guide rail is subjected to verticality change, automatic adjustment can be realized under the action of magnetic force of the magnetic wheels, so that the top magnetic wheels can be always adsorbed on the top surface of the guide rail without deviation. The invention provides an adsorption clamping device of an automatic detection mechanism for the verticality and the parallelism of an elevator guide rail.
Description
Technical Field
The invention relates to the technical field of elevator guide rail detection, in particular to an adsorption clamping device of an elevator guide rail perpendicularity and parallelism detection mechanism.
Background
The elevator guide rail is a guide part for the operation of an elevator car, the quality of the installation quality of the elevator guide rail directly influences the safe and stable operation of the elevator, the working surface of the elevator guide rail is divided into a top surface and a side surface, and the verticality is divided into the verticality of the top surface and the verticality of the side surface. The verticality and the side parallelism of the guide rail are key indexes of the installation quality of the guide rail, and the comfort and the safety of the elevator operation are directly influenced. But the detection of the perpendicularity and the parallelism of the elevator guide rail is always a difficult problem. The traditional detection method depends on manual measurement of the elevator guide rail and manual reading of a measurement result, a large detection error exists, the detection process depends on a scaffold or an elevator car, and the detection process is very long.
The traditional detection method is to measure the distance deviation between a plumb line and the surface of an elevator guide rail by using a steel plate ruler so as to obtain the verticality deviation of the guide rail, wherein a hanging plumb line is actually a pendulum, and the longer the plumb line is, the longer the time for the plumb line to recover to a stable state is, so that the length of the hanging plumb line is not suitable to be overlong, but the length of the elevator guide rail is usually dozens of hundred meters.
Along with the popularization of laser technology, the method for measuring the perpendicularity of the guide rail by matching the laser plummet with the digital display target is also gradually popularized. Firstly, the laser plummet is fixed on the guide rail, the laser plummet emits vertical laser by the adjusting knob, a detection person stands on the top of the elevator car, the digital display target is sequentially installed at each detection position, the center of the digital display target is adjusted to coincide with the center of the laser, deviation information of detection points can be obtained, and the digital display target can simultaneously read the deviation information of the perpendicularity of the top surface and the side surface. The plumb bob laser range of laser plummet can reach hectometer, need not to dismantle the plummet in the measurement process repeatedly and just can accomplish the detection, but still need dismantle repeatedly between each measuring point and install the digital display mark target, measuring time is long to need the central point of artificial adjustment digital display mark target to put, people's eye observation mark target center is whether with the coincidence of laser facula center. The long-time observation of the laser light spots can cause damage to eyes, and the deviation is caused in the judgment of the central position of the light spots, so that the deviation is caused in the measurement result of the verticality of the guide rail.
The two modes can not avoid manual participation, workers need to measure the elevator shaft point by point in the whole process in the measuring process, the whole measuring process is time-consuming and labor-consuming, an elevator car or a scaffold is relied on, detection data need to be judged and read by human eyes, great human errors exist, and great potential safety hazards exist.
Disclosure of Invention
In order to solve the existing technical problem in the aspect of elevator guide rail detection, the invention provides a clamping and adsorbing device of an automatic elevator guide rail detection mechanism, so that the automatic detection mechanism can be tightly attached to a guide rail working surface, an automatic detection task is completed, and the detection speed and the detection precision are improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an elevator guide rail hangs down straightness and depth of parallelism automated inspection mechanism adsorbs clamping device, includes: the magnetic wheel, the universal ball guide wheel, the clamping wheel slide block, the universal ball guide wheel slide block and the vehicle body are arranged on the vehicle body;
the top magnetic wheels are arranged at the upper end and the lower end of the trolley body, are tightly attached to the top surface of the guide rail by magnetic force to roll, and are connected with the trolley body of the automatic detection trolley through shafts;
the clamping wheel is divided into a fixed clamping wheel and a sliding clamping wheel, the fixed clamping wheel and the sliding clamping wheel are arranged on the middle section of the trolley body, the fixed clamping wheel is connected with the trolley body through a shaft, and the sliding clamping wheel moves along a sliding groove of the automatic detection trolley body under the action of a pre-tightening bolt by depending on a sliding block;
the universal ball guide wheel is divided into a fixed side universal ball guide wheel and a clamping side universal ball guide wheel, the fixed side universal ball guide wheel and the clamping side universal ball guide wheel are mounted at two ends of the vehicle body, the fixed side universal ball guide wheel is fixed in a groove at the left side of the vehicle body through a universal ball guide sliding block, and the clamping side universal ball guide wheel moves in a sliding groove at the right side of the vehicle body under the action of a pre-tightening bolt through a guide structure.
In a preferred embodiment: the car body is provided with three guide grooves at intervals along the height direction.
In a preferred embodiment: and the top magnetic wheel is fixed at the upper end and the lower end of the vehicle body through a magnetic wheel shaft and adsorbed on the top surface of the guide rail.
In a preferred embodiment: the universal ball guide wheel is connected with the universal ball guide wheel sliding block and is arranged at the upper end and the lower end of the vehicle body by virtue of a guide track of the universal ball guide wheel sliding block and guide grooves at the upper end and the lower end of the vehicle body.
In a preferred embodiment: the universal ball guide wheel and the universal ball guide wheel sliding block are divided into two groups along the width direction of the vehicle body, the universal ball guide wheel and the universal ball guide wheel sliding block in one group are fixedly connected, and the universal ball guide wheel sliding block in the other group are in sliding connection along the extending direction of the guide groove.
In a preferred embodiment: the clamping wheel is fixed on the left side of the vehicle body by a power shaft and is positioned at the middle section of the vehicle body, and the clamping wheel is connected with the clamping wheel sliding block through a clamping wheel shaft; and the guide rail of the clamping wheel slide block is slidably arranged in the guide groove in the middle of the vehicle body.
In a preferred embodiment: the pre-tightening bolt is installed on the right side of the vehicle body and is right opposite to the universal ball guide wheel sliding block and the clamping wheel sliding block, and pre-tightening force is applied to the universal ball guide wheel sliding block and the clamping wheel sliding block through rotating the pre-tightening bolt, so that the clamping distance is adjusted.
In a preferred embodiment: the top magnetic wheel comprises a permanent magnet and a steel sheet; the steel sheet wraps the permanent magnet.
In a preferred embodiment: when the verticality of the guide rail is just changed, the top magnetic wheel is separated from the surface of the guide rail, the clamping wheel provides resistance F for the detection mechanism, and the magnetic force F1And the torque M is generated at the other top magnetic wheel under the action of the resistance force F (F)1·L2)-(f·L1) And the automatic detection mechanism deflects under the action of the torque M, so that the automatic detection mechanism can be tightly attached to the top surface of the guide rail.
Compared with the prior art, the invention has the following beneficial effects:
(1) the clamping wheel and the universal ball guide wheel are equally divided into a fixed side and a clamping side, the fixed side is fixed on the automatic detection mechanism, and the clamping side can slide in a chute of the automatic detection mechanism through the slide block guide rail and can adapt to guide rails with different sizes and widths.
(2) The universal ball guide wheels are arranged at two ends of the vehicle body and have a certain distance with the clamping wheels, and when the verticality of the surface of the guide rail is changed (such as bending and ladder), the magnetic force of the magnetic wheel generates a moment at the position of the top magnetic wheel, so that the detection mechanism can be automatically adjusted, and the magnetic wheel can be always adsorbed on the top surface of the guide rail.
(3) The bolt is utilized to apply pretightening force to the clamping wheel slide block, so that the clamping wheel can be tightly attached to the side working surface of the guide rail, sufficient friction force is provided, and slipping is prevented. In the face of guide rail surfaces under different conditions, enough friction force can be applied only by adjusting the pre-tightening bolts, and meanwhile, the guide rail or the automatic detection mechanism cannot deform due to overlarge pre-tightening force without slipping by adjusting proper pre-tightening force.
Compared with the prior art, the elevator guide rail perpendicularity and parallelism automatic detection mechanism adsorption clamping device provided by the invention has the advantages that the magnetic wheel adsorption mechanism and the universal ball guide mechanism are pre-tightened through the bolts, the automatic detection mechanism is automatically adjusted by magnetic force, the automatic detection mechanism can be always tightly attached to the guide rail to run safely and stably vertically, the automatic detection mechanism can run on the surfaces of guide rails of different models by the aid of the sliding block mechanism with adjustable intervals, the elevator guide rail detection automation is realized, and the detection speed and the detection accuracy are greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of an adsorption clamping device of an automatic detection mechanism for perpendicularity and parallelism of an elevator guide rail.
Fig. 2 is a schematic diagram of the structure of a second embodiment of an adsorption clamping device of an automatic detection mechanism for the perpendicularity and the parallelism of an elevator guide rail.
Fig. 3 is a schematic diagram of the structure of an adsorption clamping device of an automatic detection mechanism for the perpendicularity and the parallelism of an elevator guide rail in normal operation.
Fig. 4 is a schematic diagram of the automatic adjustment of the adsorption clamping device of the elevator guide rail perpendicularity and parallelism automatic detection mechanism when the guide rail perpendicularity changes.
Fig. 5 is a schematic diagram of an automatic result of an adsorption clamping device of an automatic detection mechanism for perpendicularity and parallelism of an elevator guide rail after the perpendicularity of the guide rail is changed.
In the figure: 1-top magnetic wheel, 2-magnetic wheel shaft, 3-universal ball guide wheel, 4-universal ball guide wheel slide block, 5-clamping wheel, 6-clamping wheel slide block, 7-power shaft, 8-clamping wheel shaft, 9-pre-tightening bolt, 10-vehicle body, 11-slide block guide rail, 12-vehicle body guide groove, 13-permanent magnet, 14-steel sheet and 15-magnetic wheel seat.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, which are merely for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like, are used in a broad sense, and for example, "connected" may be a wall-mounted connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, and those skilled in the art will understand the specific meaning of the terms in the present invention specifically.
Referring to fig. 1-5, this embodiment provides an elevator guide rail perpendicularity and parallelism automatic detection mechanism adsorbs clamping device, includes: the device comprises a top magnetic wheel 1, a universal ball guide wheel 3, a clamping wheel 5, a clamping wheel slide block 6, a universal ball guide wheel slide block 4 and a vehicle body 10;
the top magnetic wheels 1 are arranged at the upper end and the lower end of the trolley body 10, tightly cling to the top surface of the guide rail by magnetic force to roll, and are connected with the automatic detection trolley body 10 through a shaft; the clamping wheel 5 is divided into a fixed clamping wheel and a sliding clamping wheel and is arranged in the middle section of the trolley body 10, the fixed clamping wheel is connected with the trolley body 10 through a shaft, and the sliding clamping wheel moves along a sliding groove 12 of the automatic detection trolley body under the action of a pre-tightening bolt 9 by means of a sliding block; the universal ball guide wheel 3 is divided into a fixed side universal ball guide wheel and a clamping side universal ball guide wheel, and is installed at two ends of the vehicle body 10, the fixed side universal ball guide wheel is fixed in a groove at the left side of the vehicle body 10 through a universal ball guide sliding block, and the clamping side universal ball guide wheel 3 moves in a sliding groove 12 at the right side of the vehicle body 10 under the action of a pre-tightening bolt 9 through a guide structure.
In order to realize the above structure, the vehicle body 10 in the present embodiment is provided with three guide grooves 12 at intervals in the height direction. The top magnetic wheel 1 is fixed at the upper end and the lower end of the vehicle body 10 through the magnetic wheel shaft 2 and is adsorbed on the top surface of the guide rail. The universal ball guide wheel 3 is connected with the universal ball guide wheel sliding block 4 and is arranged at the upper end and the lower end of the vehicle body 10 by means of a guide rail 11 of the universal ball guide wheel sliding block 4 and guide grooves 12 at the upper end and the lower end of the vehicle body 10.
The universal ball guide wheel 3 and the universal ball guide wheel slide block 4 are divided into two groups along the width direction of the vehicle body 10, wherein the universal ball guide wheel 3 and the universal ball guide wheel slide block 4 in one group are fixedly connected, and the universal ball guide wheel 3 and the universal ball guide wheel slide block 4 in the other group are in sliding connection along the extending direction of the guide groove 12.
The clamping wheel 5 is fixed on the left side of the vehicle body 10 by virtue of a power shaft 7 and is positioned at the middle section of the vehicle body 10, and the clamping wheel 5 is connected with a clamping wheel slide block 6 through a clamping wheel shaft 8; the guide rail of the clamping wheel slide block 6 is slidably arranged in a guide groove 11 in the middle of the vehicle body 10.
The pre-tightening bolt 9 is installed on the right side of the vehicle body 10 and is right opposite to the universal ball guide wheel slide block 4 and the clamping wheel slide block 6, pre-tightening force is applied to the universal ball guide wheel slide block 4 and the clamping wheel slide block 6 through rotating the pre-tightening bolt 9, and therefore the clamping distance is adjusted.
Furthermore, the top magnetic wheel 1 comprises a permanent magnet 13, a steel sheet 14; the steel sheet 14 wraps the permanent magnet 13.
When the device is used, when the verticality of the guide rail is just changed, the running state of the automatic detection mechanism is as shown in fig. 4, the top magnetic wheel 1 is separated from the surface of the guide rail, the clamping wheel 5 provides resistance F for the detection mechanism, torque is generated at the other top magnetic wheel 1 under the action of magnetic force F1 and the resistance F, the automatic detection mechanism deflects under the action of the torque M, and the whole detection mechanism is automatically adjusted to be tightly attached to the top surface of the guide rail, as shown in fig. five.
When the pretightening force is applied by adjusting the pretightening bolt 9, the pretightening force can be adjusted according to a friction force formula F ═ FNMu, calculating the pre-tightening force required by the automatic detection mechanism, wherein if the pre-tightening force is too small, the detection mechanism cannot clamp the guide rail, so that the guide rail slips, and if the pre-tightening force is too large, the detection mechanism deforms, so that the detection result is influenced. Therefore, the torque to be applied to the preload bolt 9 is calculated according to a preload formula T ═ k · F · d, where T is the tightening torque, k is the tightening torque coefficient, F is the required preload, and d is the nominal diameter of the thread. And then applying the required pretightening force by using a torque wrench.
The above description is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any person skilled in the art can make insubstantial changes in the technical scope of the present invention within the technical scope of the present invention, and the actions infringe the protection scope of the present invention are included in the present invention.
Claims (9)
1. The utility model provides an elevator guide rail hangs down straightness and depth of parallelism automated inspection mechanism adsorbs clamping device which characterized in that includes: the magnetic wheel, the universal ball guide wheel, the clamping wheel slide block, the universal ball guide wheel slide block and the vehicle body are arranged on the vehicle body;
the top magnetic wheels are arranged at the upper end and the lower end of the trolley body, are tightly attached to the top surface of the guide rail by magnetic force to roll, and are connected with the trolley body of the automatic detection trolley through shafts;
the clamping wheel is divided into a fixed clamping wheel and a sliding clamping wheel, the fixed clamping wheel and the sliding clamping wheel are arranged on the middle section of the trolley body, the fixed clamping wheel is connected with the trolley body through a shaft, and the sliding clamping wheel moves along a sliding groove of the automatic detection trolley body under the action of a pre-tightening bolt by depending on a sliding block;
the universal ball guide wheel is divided into a fixed side universal ball guide wheel and a clamping side universal ball guide wheel, the fixed side universal ball guide wheel and the clamping side universal ball guide wheel are mounted at two ends of the vehicle body, the fixed side universal ball guide wheel is fixed in a groove at the left side of the vehicle body through a universal ball guide sliding block, and the clamping side universal ball guide wheel moves in a sliding groove at the right side of the vehicle body under the action of a pre-tightening bolt through a guide structure.
2. The elevator guide rail perpendicularity and parallelism automatic detection mechanism adsorption clamping device according to claim 1, characterized in that: the vehicle body 10 is provided with three guide grooves 12 at intervals in the height direction.
3. The elevator guide rail perpendicularity and parallelism automatic detection mechanism adsorption clamping device according to claim 1, characterized in that: the top magnetic wheel 1 is fixed at the upper end and the lower end of the vehicle body 10 through the magnetic wheel shaft 2 and is adsorbed on the top surface of the guide rail.
4. The elevator guide rail perpendicularity and parallelism automatic detection mechanism adsorption clamping device according to claim 1, characterized in that: the universal ball guide wheel 3 is connected with the universal ball guide wheel sliding block 4, and the guide rail 11 of the universal ball guide wheel sliding block 4 and the guide grooves 12 at the upper end and the lower end of the vehicle body 10 are arranged at the upper end and the lower end of the vehicle body 10.
5. The elevator guide rail perpendicularity and parallelism automatic detection mechanism adsorption clamping device according to claim 1, characterized in that: universal ball leading wheel 3 and universal ball leading wheel slider 4 divide into two sets ofly along the width direction of automobile body 10, and wherein universal ball leading wheel 3 and universal ball leading wheel slider 4 are fixed connection in a set of, and universal ball leading wheel 3 and universal ball leading wheel slider 4 are along the extending direction sliding connection of guide slot 12 in another set of.
6. The elevator guide rail perpendicularity and parallelism automatic detection mechanism adsorption clamping device according to claim 1, characterized in that: the clamping wheel 5 is fixed on the left side of the vehicle body 10 by virtue of a power shaft 7 and is positioned at the middle section of the vehicle body 10, and the clamping wheel 5 is connected with a clamping wheel slide block 6 through a clamping wheel shaft 8; the guide rail of the clamping wheel slide block 6 is slidably arranged in a guide groove 11 in the middle of the vehicle body 10.
7. The elevator guide rail perpendicularity and parallelism automatic detection mechanism adsorption clamping device according to claim 1, characterized in that: the pre-tightening bolt 9 is installed on the right side of the vehicle body 10 and is right opposite to the universal ball guide wheel slide block 4 and the clamping wheel slide block 6, pre-tightening force is applied to the universal ball guide wheel slide block 4 and the clamping wheel slide block 6 through rotating the pre-tightening bolt 9, and therefore the clamping distance is adjusted.
8. The elevator guide rail perpendicularity and parallelism automatic detection mechanism adsorption clamping device according to claim 1, characterized in that: the top magnetic wheel 1 comprises a permanent magnet 13 and a steel sheet 14; the steel sheet 14 wraps the permanent magnet 13.
9. The elevator guide rail perpendicularity and parallelism automatic detection mechanism adsorption clamping device according to claim 1, characterized in that: when the verticality of the guide rail is just changed, the top magnetic wheel is separated from the surface of the guide rail, the clamping wheel provides resistance F for the detection mechanism, and the magnetic force F1And the torque M is generated at the other top magnetic wheel under the action of the resistance force F (F)1·L2)-(f·L1) And the automatic detection mechanism deflects under the action of the torque M, so that the automatic detection mechanism can be tightly attached to the top surface of the guide rail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210138249.3A CN114537547A (en) | 2022-02-15 | 2022-02-15 | Elevator guide rail straightness and depth of parallelism automated inspection mechanism adsorb clamping device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210138249.3A CN114537547A (en) | 2022-02-15 | 2022-02-15 | Elevator guide rail straightness and depth of parallelism automated inspection mechanism adsorb clamping device |
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| Publication Number | Publication Date |
|---|---|
| CN114537547A true CN114537547A (en) | 2022-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210138249.3A Pending CN114537547A (en) | 2022-02-15 | 2022-02-15 | Elevator guide rail straightness and depth of parallelism automated inspection mechanism adsorb clamping device |
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| CN (1) | CN114537547A (en) |
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| CN111975738A (en) * | 2019-05-24 | 2020-11-24 | 北京海益同展信息科技有限公司 | Clamping device and track inspection robot |
| CN214237828U (en) * | 2020-12-17 | 2021-09-21 | 江苏省特种设备安全监督检验研究院 | Automatic clamping device for high-altitude track intelligent detection system |
| DE202022100179U1 (en) * | 2022-01-13 | 2022-01-20 | Wittur Holding Gmbh | Trigger unit for actuating an elevator braking device |
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| CN1587905A (en) * | 2004-10-14 | 2005-03-02 | 上海交通大学 | Detecting robot for lift rail perpendicularity |
| CN201056237Y (en) * | 2007-04-17 | 2008-05-07 | 中国石油天然气管道局 | Ultrasound wave detecting magnetic adsorption creeping device for large-scale storage tank phase array |
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Application publication date: 20220527 |