CN104117166A - Deep well rescuing device - Google Patents
Deep well rescuing device Download PDFInfo
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- CN104117166A CN104117166A CN201310148993.2A CN201310148993A CN104117166A CN 104117166 A CN104117166 A CN 104117166A CN 201310148993 A CN201310148993 A CN 201310148993A CN 104117166 A CN104117166 A CN 104117166A
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Abstract
The invention provides a deep well rescuing device which is used for rescuing persons trapped in a deep well. The deep well rescuing device comprises a bearing structure, a positioning mechanism, a clamping mechanism, a position adjustment mechanism, a lifting mechanism, a master control system and a communication device, wherein the bearing mechanism comprises a plurality of support plates and a plurality of support shafts, and all the support plates and the support shafts form the multi-layer bearing structure; the positioning mechanism is used for positioning the deep well rescuing device to a well wall so as to prevent the deep well rescuing device from swinging; the clamping mechanism is used for enabling a mechanical arm to rotate by small angles in a pivoted mode in the radial direction in the rescuing process so as to fasten the trapped person in the deep well rescuing device; the position adjustment mechanism is used for adjusting the mechanical arm to an appropriate position in the circumferential direction so as to stretch the mechanical arm into the well; the lifting mechanism is used for making direct contact with the human body and protecting the person in the deep well rescuing device.
Description
Technical field
The present invention relates to a kind of deep-well rescue device, the emergency relief while falling into deep-well outward for people's will, belongs to Electromechanical Control field.
Background technology
In life, also there is potential safety hazard in well in providing convenience for the mankind.In the time that people's will falls into deep-well outward, because well head is too narrow, the degree of depth makes too greatly to such an extent that rescue exists very large difficulty and dangerous, also therefore leads to many tragedies.
In existing a kind of deep well rescue device, clamp the health of trapped personnel by clamping part, then utilize rope that people is pulled out to deep-well.This device has many shortcomings, for example, can in well, rock, and is difficult for location, easily causes trapped personnel injured etc.Therefore, the actual use value of this device is not high, is not applied widely.At present, conventionally still use simple rope that rescue personnel is put into down-hole and rescue, this rescue mode not only length consuming time, efficiency is low, and rescue personnel also exists certain danger.
Thus, the present invention proposes a kind of practical deep well rescue device that can overcome above-mentioned shortcoming, does not need rescue personnel to enter down-hole, and consuming time short, and efficiency is high, can not cause secondary injury to trapped personnel.
Summary of the invention
The object of this invention is to provide a kind of deep well rescue device, it can save trapped personnel in the degree of depth in the circular well of 10m and above diameter 35cm to 50cm.
According to an aspect of the present invention, provide a kind of deep-well rescue device, comprising: supporting structure, comprise multiple gripper shoes and multiple back shaft, each gripper shoe and multiple back shaft form multilayer supporting structure; Detent mechanism, for described deep-well rescue device is positioned to the borehole wall, thereby prevents that described deep-well rescue device from rocking; Clamping device, for making mechanical arm in rescue process low-angle pivotable diametrically, captive is fastened in described deep-well rescue device; Positioner, for mechanical arm is adjusted to week upwards suitable position so that mechanical arm is stretched into well; Lift mechanism, for directly contacting with human body and people protected at described deep-well rescue device; And turn-key system and communication device.
Described multiple gripper shoe comprises upper plate, upper plate, lower plate and lower plate, have separately at upwards equally distributed multiple installing hole of week, described multiple back shaft comprises that the six roots of sensation has the first back shaft of the first length and three and have the second back shaft of the second length, wherein, described upper plate is connected by three the first back shafts with described upper plate, described upper plate is connected by three the second back shafts with described lower plate, described lower plate is connected by three the first back shafts with described lower plate, and wherein, described lower plate has driving cog, described driving cog engages with the pinion shaft in described positioner, for the gear drive of positioner.Described detent mechanism is preferably umbrella detent mechanism.
Described umbrella detent mechanism comprises motor, leading screw, umbrella axis, axle sleeve and umbrella shape telescoping mechanism, the upper end of described umbrella axis is fixedly connected with in described gripper shoe one, lower end is fixedly connected with described axle sleeve, the top axial of described leading screw is fixed in described axle sleeve, lower end is connected with described motor, and described motor is fixed on another in described gripper shoe, described umbrella shape telescoping mechanism comprises six roots of sensation umbrella support, six roots of sensation umbrella frame, a umbrella support connector, two umbrella frame connectors and six wheels, described two umbrella frame connectors are cylindrical component, be socketed on described umbrella axis, each umbrella frame connector is connected with three umbrella frames by the auricle that is mutually 120 degree angles on it, described umbrella support connector is arranged on described leading screw, be connected with one end of three umbrella supports by the auricle that is mutually 120 degree angles on it, the other end of described three umbrella supports is connected with umbrella frame respectively, other three umbrella supports are connected between two umbrella frames separately.
Described clamping device is lead-screw drive mechanism, comprise ball-screw, push pedal, three springs, motor and three groups of drive link assemblies, described ball-screw is connected on motor, push pedal is arranged on described ball-screw, can move up and down along with the rotation of ball-screw, one end of each spring is connected to and is enclosed within regularly on leading screw upper-part, and the other end is connected with a drive link assembly.Every group of drive link assembly comprises three connecting rods.
Described positioner is gear drive, comprise three pinion shafts that engage with the driving cog of the lower plate of described supporting structure, each pinion shaft is arranged between upper junction plate and lower connecting plate separately, one end of upper junction plate and lower connecting plate is fixed on the central shaft of described lower plate, the other end interconnects by connector, described connector is directly connected with mechanical arm, on each upper junction plate, is provided with motor cabinet, is fixed with respectively motor on each motor cabinet.
Described lift mechanism is bar linkage telescopic mechanism, comprise three T-shaped beams, every tee girder one end is connected with described positioner, on every tee girder, be installed with a motor cabinet, each motor cabinet is connected with the motor output shaft of leading screw form, on every tee girder, be set with a slide block, on each slide block, be connected with separately drive link assembly, described drive link assembly comprises push rod, described push rod is connected by pin with the gripper of Liang Weichu, each gripper comprises three groups of support bars, and every group of support bar is made up of two connecting rods, and described connecting rod is connected by pin.
In sum, the invention provides a kind of deliverance apparatus in emergency circumstances, combine mechanical movement, Electronic Control, the technology such as communications, for deep well rescue provides convenience, have reliability high, the feature of easy accessibility.
Brief description of the drawings
Use following explanation and accompanying drawing to will be better appreciated by the application, wherein:
Fig. 1 is the front view according to deep-well rescue device of the present invention;
Fig. 2 is the top view according to deep-well rescue device of the present invention;
Fig. 3 is according to the perspective view of the supporting structure of deep-well rescue device of the present invention;
Fig. 4 is according to the perspective view of the detent mechanism of deep-well rescue device of the present invention, and wherein said detent mechanism is in contraction state;
Fig. 5 is according to the perspective view of the detent mechanism of deep-well rescue device of the present invention, and wherein said detent mechanism is in deployed condition;
Fig. 6 is the fragmentary, perspective view according to deep-well rescue device of the present invention, wherein shows in detail clamping device;
Fig. 7 is according to the perspective view of the positioner of deep-well rescue device of the present invention, wherein shows in detail each building block of described supporting structure;
Fig. 8 is that wherein gripper is in contraction state according to the perspective view of the lift mechanism of deep-well rescue device of the present invention;
Fig. 9 is that wherein gripper is in deployed condition according to the perspective view of the lift mechanism of deep-well rescue device of the present invention;
In figure: 1-upper plate; 2,5-back shaft; The lower plate of 3-; 3 '-upper plate; 4-lower plate; 6-central shaft; 7,27-motor; 8,19,39-leading screw; 9-nut; 10,28-shaft coupling; 11-T ellbeam; 12-slide block; 13,22,31,33-connector; 14-push rod; 15-beam tail; 16,17-support bar; 18,25,26 motor cabinets; 20-bearing; 21,30,32-pinion shaft; 23-upper junction plate; 23 '-lower connecting plate; 24,29-fixture; 34 umbrella axis; 35-umbrella frame connector; 36-umbrella frame; 41-umbrella support connector; 37,40-umbrella support; 38-axle sleeve; 42-wheel; 43,44,46-connecting rod; 45-rope retainer ring; 47-spring.
Detailed description of the invention
Fig. 1 is the front view according to deep-well rescue device of the present invention, and Fig. 2 is the top view according to deep-well rescue device of the present invention.As shown in the figure, deep-well rescue device comprises supporting structure, detent mechanism, clamping device, positioner, lift mechanism, turn-key system and communication device.Open by mechanical arm being closed up after stretching under captive body, captive is embraced in rescuing device, finally with rope, rescuing device and captive are together pulled, thereby realize downhole rescuing.
As shown in Figure 3, supporting structure is the structure of stratiform, comprises upper plate 1, lower plate 3, upper plate 3 ' and 4 four gripper shoes of lower plate, and described four gripper shoes are the plectane of diameter 150mm, in every gripper shoe, have circumferential equally distributed installing hole, described installing hole is through hole.Supporting structure also comprises that the six roots of sensation is about the back shaft 2 of 380mm and three and is about the back shaft 5 of 140mm, and every back shaft two ends are provided with screw thread.Upper plate 1 is connected by three back shafts 2 that are about 380mm that are mutually 120 degree angles with upper plate 3 ', the back shaft 5 of upper plate 3 ' and lower plate 3 three long 140mm by being mutually 120 degree angles is connected, the back shaft 2 of lower plate 3 and lower plate 4 three long 380mm by being mutually 120 degree angles is connected, and forms the supporting structure of stratiform.Back shaft is connected in the following manner with each plate: support the installing hole of the tip of the axis through plate, then utilize nut that back shaft is connected on plate.Each gripper shoe also comprises centre bore, and upper plate, upper plate and lower plate are also included near the circumferentially equally distributed multiple apertures of centre bore, and the quantity of aperture is preferably four or six.Described centre bore and aperture are for bolted through hole.Particularly, upper plate 1 is connected with detent mechanism and rope retainer ring 45 by bolt, and lower plate 3 is connected with motor 7 by bolt, and lower plate 4 is with driving cog, and driving cog engages with the pinion shaft in positioner, for the gear drive of positioner.
As shown in Figure 4 and Figure 5, detent mechanism is the supporting mechanism of umbrella, in downhole rescuing process, deep-well rescue device being positioned to the borehole wall, prevents that deep-well rescue device from rocking in down-hole thereby reach, and reduces rescue difficulty.Detent mechanism comprises that 39, one of leading screws that 7, one, a motor is about 180mm are about umbrella axis 34, axle sleeve 38 and the umbrella shape telescoping mechanism of 170mm.Umbrella shape telescoping mechanism by three connecting rods that are about 100mm 37, three be about the umbrella support 40 of 100mm, umbrella frame that the six roots of sensation is about 110mm 36, two umbrella frame connectors 35, umbrella support connector 41, six wheels 42 form.Umbrella frame connector 35 is cylindrical components, and the two ends of each umbrella frame connector are provided with the orthogonal pin hole of axis.Each umbrella frame connector is by being connected to form two groups of umbrella frames from radially-protruding three groups of auricles and three umbrella frames 36 that are mutually 120 degree angles of its outer wall.There is screw thread on umbrella axis top, is respectively being provided with the two group axis mutually perpendicular pin holes corresponding with the pin hole of umbrella frame connector 35 apart from about 20mm place, umbrella axis two ends, thereby each umbrella frame connector is fixed on umbrella axis 34 with pin.Every umbrella frame 36 ends are installed a wheel 42, between upper and lower umbrella frame, connect by connecting rod 37, and lower group umbrella frame is connected with umbrella support connector 41 by umbrella support 40.Umbrella support connector 41 is cylindrical components, is connected with umbrella support 40 by three groups of auricles that are mutually 120 degree that stretch out from its outer wall, and the end face of umbrella support connector is connected with the nut of leading screw 39 by glue.Axle sleeve 38 is stretched into from axle sleeve 38 two ends respectively in the lower end of the upper end of leading screw 39 and umbrella axis 34, and the upper end of umbrella axis 34 is connected with the upper plate 1 of supporting structure by screw thread.Axle sleeve 38 is fixedly connected with umbrella axis 34 with pin by the pin hole on it, and leading screw 39 upper ends are by axle sleeve 38 axial location, and lower end is connected with motor 7 by shaft coupling 10,28, and motor 7 is fixed on the upper plate 3 ' of supporting structure.On leading screw 39, be engaged with nut, umbrella support connector is fastened on this nut.When work, drive leading screw 39 to rotate by motor 7, nut moves up and down along with the rotation of leading screw, thereby drives 41 liftings of umbrella support connector, completes the draw-in and draw-off function of umbrella mechanism.When umbrella mechanism shrinks (as shown in Figure 4), deep-well rescue device can unhinderedly enter from well head, when umbrella mechanism deploying (as shown in Figure 5), deep-well rescue device can be positioned on the borehole wall.
As shown in Figure 6, clamping device is lead-screw drive mechanism, for making mechanical arm in rescue process low-angle pivotable diametrically, thereby reach, people is fixed tightly in to the object in deep-well rescue device.Clamping device bag is crossed the drive link assembly of the long ball-screw of an about 300mm 8, push pedal, three springs 47, motor, the about 100mm of three group leaders, and every group of drive link assembly comprises three connecting rods 43,44,46.On leading screw 8, be engaged with nut 9, push pedal is fastened on this nut by its centre bore, and one end of each spring is connected to and is enclosed within regularly on leading screw upper-part, and the other end is connected with a drive link assembly.The upper end of leading screw 8 is connected to the motor being fixed on lower plate 3 by shaft coupling, the central shaft 6 of lower end and lower plate 4 is connected.When work, drive leading screw to rotate by motor 7, nut moves up and down along with the rotation of leading screw, thereby drive push pedal lifting, the lifting of push pedal causes drive link assembly low-angle pivotable diametrically, and then after drive link transmission, drive lift mechanism inwardly or outwards to rotate diametrically, complete holding function.
As shown in Figure 7, positioner is set of gears transmission mechanism, for mechanical arm is adjusted to week upwards suitable position so that mechanical arm is stretched into well.Positioner comprises three pinion shafts 21,30 and 32 that engage with the driving cog of the lower plate 4 of supporting structure, each pinion shaft is arranged between upper junction plate 23 and lower connecting plate 23 ' separately, one end of upper junction plate 23 and lower connecting plate 23 ' is respectively arranged with installing hole, to be fixed on the central shaft 6 of lower plate 4, the other end interconnects by connector 22,31,33, and connector 22,31,33 and upper lower connecting plate 23,23 ' preferably interconnect by bolt-nut assembly.Connector 22,31,33 is directly connected with mechanical arm.On each upper junction plate 23, be provided with motor cabinet 25 and 26, on each motor cabinet 25 and 26, be fixed with respectively motor 27.When work, drive three pinion shafts 21,30 and 32 to rotate by three motors 27, positioner is rotated along driving cog, reach the object of adjusting mechanical arm circumferential position.
As shown in Figure 8 and Figure 9, lift mechanism is bar linkage telescopic mechanism, for directly contacting with human body and people is protected at deep-well rescue device.Lift mechanism comprises three T-shaped beams 11 that are about 1500mm, and every tee girder one end is connected with positioner by connector 12, and connector 12 can be screw or pin.On every tee girder 11, be installed with a motor cabinet 18 apart from about 100mm place, positioner below, one end of the output shaft of motor is arranged on motor cabinet, and the other end is arranged on bearing 20, and the output shaft of this motor is manufactured into leading screw 19.On leading screw 19, be engaged with nut, be fixed with slide block 12 on nut, slide block 12 is enclosed within on tee girder by the through hole on it.When work, the rotation of leading screw 19 causes nut to move up and down along leading screw 19, thereby slide block is moved up and down taking T-shaped beam as guide rail.On slide block, be connected with drive link assembly, drive link assembly can comprise two push rods 14.Push rod 14 is connected by pin with the gripper at beam tail 15 places, makes moving up and down of slide block make push rod promote the gripper at fine strain of millet tail 15 places.Each gripper comprises three groups of support bars 16,17, and every group of support bar is made up of two connecting rods that are about 120mm, and described connecting rod is connected by fixture 24,29, and described fixture can be pin.Gripper has structure deployable or that shrink, in the time of work, launch along with moving up and down of slide block or shrink, gripper under contraction state from well the space on captive side reach below captive, in the time arriving below captive correct position place, become deployed condition, thereby captive is enclosed in lift mechanism.Preferably, on described lift mechanism, can also be provided with flexible material, as rubber blanket, foam-rubber cushion etc.
Turn-key system is a set of by computer-controlled motor driven systems, for the motion of real time control machine structure.It comprises computer, single-chip microcomputer, six motor drive plates and some wires.Ground rescuer, by operation computer control motor rotation, drives rescuing device motion, implements rescue.
Communication device comprises illuminator, camera and phone system, is connected to computer, in order to obtain down-hole trapped person's situation with the corresponding circuit board of illuminator, imaging system and phone system.
To the course of work of deep-well rescue device of the present invention be described below.
Rope is tied up on rope retainer ring 45, vertically hang in from ground well, by camera head monitor, rescuing device is being stopped by above oppressive, drive the motor 7 of detent mechanism, drive leading screw 39 to rotate, detent mechanism launches, make wheel 42 contact the borehole wall, do not rock in down-hole, device completes location.Ground rescuer observes the attitude of captive in well by camera, finds the space of three about 20mm.Find behind suitable space, drive the motor 27 of positioner so that positioner work, positioner is adjusted the circumferential position of three groups of mechanical arms, makes three groups of mechanical arms aim at the space of finding.Adjust behind position, rope is slowly transferred, rescuing device slowly moves down along the borehole wall, and each mechanical arm is stretched under captive body, and now the gripper of lift mechanism is in contraction state.In the time that mechanical arm extend into the position that makes fixture 29 arrive captive below, drive the leading screw 19 of lift mechanism to rotate, to promote support bar 17 by moving down of push rod 14, until support bar 17 tops approach horizontal level, thereby the machinery that makes lift mechanism turns in deployed condition, captive is enclosed in the gripper of lift mechanism.Then, drive the leading screw 8 of clamping device to rotate, make clamping device pivotable diametrically thereby promote connecting rod 43,44,46 by push pedal 9, captive is clamped.Finally drive the motor 7 of detent mechanism that detent mechanism is packed up, by rope, people is moved to outside well together with deep-well rescue device, rescue task completes.
It should be understood that for the sake of clarity, in above-mentioned accompanying drawing, omitted standard connector, such as nut, screw thread, pin etc.These standard connectors and concrete connected mode are described by explanatory note, and those skilled in the art can realize interconnecting of each parts by these text descriptions and accompanying drawing.
Above-described embodiment is only for example object, and do not form the restriction to deep-well rescue device of the present invention.The present invention also can be used for rescue and is confined in the animal of down-hole, or takes out the object that drops to down-hole.
Claims (8)
1. deep-well rescue device, comprising: supporting structure, comprise multiple gripper shoes and multiple back shaft, and each gripper shoe and multiple back shaft form multilayer supporting structure; Detent mechanism, for described deep-well rescue device is positioned to the borehole wall, thereby prevents that described deep-well rescue device from rocking; Clamping device, for making mechanical arm in rescue process low-angle pivotable diametrically, captive is fastened in described deep-well rescue device; Positioner, for mechanical arm is adjusted to week upwards suitable position so that mechanical arm is stretched into well; Lift mechanism, for directly contacting with human body and people protected at described deep-well rescue device; And turn-key system and communication device.
2. deep-well rescue device according to claim 1, it is characterized in that: described multiple gripper shoes comprise upper plate, upper plate, lower plate and lower plate, have separately at upwards equally distributed multiple installing hole of week, described multiple back shaft comprises that the six roots of sensation has the first back shaft of the first length and three and have the second back shaft of the second length, wherein, described upper plate is connected by three the first back shafts with described upper plate, described upper plate is connected by three the second back shafts with described lower plate, described lower plate is connected by three the first back shafts with described lower plate, and wherein, described lower plate has driving cog, described driving cog engages with the pinion shaft in described positioner, for the gear drive of positioner.
3. deep-well rescue device according to claim 2, is characterized in that: described detent mechanism is umbrella detent mechanism.
4. deep-well rescue device according to claim 3, it is characterized in that: described umbrella detent mechanism comprises motor, leading screw, umbrella axis, axle sleeve and umbrella shape telescoping mechanism, the upper end of described umbrella axis is fixedly connected with in described gripper shoe one, lower end is fixedly connected with described axle sleeve, the top axial of described leading screw is fixed in described axle sleeve, lower end is connected with described motor, and described motor is fixed on another in described gripper shoe, described umbrella shape telescoping mechanism comprises six roots of sensation umbrella support, six roots of sensation umbrella frame, a umbrella support connector, two umbrella frame connectors and six wheels, described two umbrella frame connectors are cylindrical component, be socketed on described umbrella axis, each umbrella frame connector is connected with three umbrella frames by the auricle that is mutually 120 degree angles on it, described umbrella support connector is arranged on described leading screw, be connected with one end of three umbrella supports by the auricle that is mutually 120 degree angles on it, the other end of described three umbrella supports is connected with umbrella frame respectively, other three umbrella supports are connected between two umbrella frames separately.
5. deep-well rescue device according to claim 2, it is characterized in that: described clamping device is lead-screw drive mechanism, comprise ball-screw, push pedal, three springs, motor and three groups of drive link assemblies, described ball-screw is connected on motor, push pedal is arranged on described ball-screw, can move up and down along with the rotation of ball-screw, one end of each spring is connected to and is enclosed within regularly on leading screw upper-part, and the other end is connected with a drive link assembly.
6. deep-well rescue device according to claim 5, is characterized in that: every group of drive link assembly comprises three connecting rods.
7. deep-well rescue device according to claim 2, it is characterized in that: described positioner is gear drive, comprise three pinion shafts that engage with the driving cog of the lower plate of described supporting structure, each pinion shaft is arranged between upper junction plate and lower connecting plate separately, one end of described upper junction plate and described lower connecting plate is fixed on the central shaft of described lower plate, the other end interconnects by connector, described connector is directly connected with mechanical arm, on each upper junction plate, be provided with motor cabinet, on each motor cabinet, be fixed with respectively motor.
8. according to the deep-well rescue device described in any one in claim 2-7, it is characterized in that: described lift mechanism is bar linkage telescopic mechanism, comprise three T-shaped beams, every tee girder one end is connected with described positioner, on every tee girder, be installed with a motor cabinet, each motor cabinet is connected with the motor output shaft of leading screw form, on every tee girder, be set with a slide block, on each slide block, be connected with separately drive link assembly, described drive link assembly comprises push rod, described push rod is connected by pin with the gripper of Liang Weichu, each gripper comprises three groups of support bars, every group of support bar is made up of two connecting rods, described connecting rod is connected by pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310148993.2A CN104117166A (en) | 2013-04-26 | 2013-04-26 | Deep well rescuing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310148993.2A CN104117166A (en) | 2013-04-26 | 2013-04-26 | Deep well rescuing device |
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| CN104117166A true CN104117166A (en) | 2014-10-29 |
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| CN201310148993.2A Pending CN104117166A (en) | 2013-04-26 | 2013-04-26 | Deep well rescuing device |
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Cited By (8)
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| CN104922826A (en) * | 2015-06-30 | 2015-09-23 | 李开伟 | Deep well rescue device |
| CN105031850A (en) * | 2015-09-15 | 2015-11-11 | 象山警伟钢叉制造有限公司 | Deep well lifesaving telescopic rod |
| CN105881542A (en) * | 2014-11-25 | 2016-08-24 | 路仲利 | Mechanical hand for rescue in deep well |
| CN106581888A (en) * | 2016-12-19 | 2017-04-26 | 陈雨晴 | Emergency well falling rescue device |
| CN107596589A (en) * | 2017-09-30 | 2018-01-19 | 季松石 | A kind of underground lifesaving appliance |
| CN108653952A (en) * | 2017-03-29 | 2018-10-16 | 南京农业大学 | A kind of novel deep well rescue holder |
| CN109573900A (en) * | 2018-12-24 | 2019-04-05 | 徐森良 | Adjustable four paws depth hole rescuing device and its rescue mode |
| CN112386830A (en) * | 2020-11-25 | 2021-02-23 | 刘保根 | Rescue tool for shaft fire control |
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| CN109573900A (en) * | 2018-12-24 | 2019-04-05 | 徐森良 | Adjustable four paws depth hole rescuing device and its rescue mode |
| CN109573900B (en) * | 2018-12-24 | 2020-07-24 | 徐森良 | Adjustable four-claw deep hole rescue device and rescue method thereof |
| CN112386830A (en) * | 2020-11-25 | 2021-02-23 | 刘保根 | Rescue tool for shaft fire control |
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Application publication date: 20141029 |