CN202912615U - Protection device for preventing mechanical equipment from dropping - Google Patents

Protection device for preventing mechanical equipment from dropping Download PDF

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Publication number
CN202912615U
CN202912615U CN201220481500.8U CN201220481500U CN202912615U CN 202912615 U CN202912615 U CN 202912615U CN 201220481500 U CN201220481500 U CN 201220481500U CN 202912615 U CN202912615 U CN 202912615U
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CN
China
Prior art keywords
voussoir
brake wire
mechanical equipment
slide block
buffer gear
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.)
Expired - Lifetime
Application number
CN201220481500.8U
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Chinese (zh)
Inventor
李建昌
焦阳
王友
付伟
白岩
吕长兵
寇亮
俞抗
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sinopec Engineering Inc
China Petrochemical Corp
Original Assignee
Sinopec Engineering Inc
China Petrochemical Corp
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Filing date
Publication date
Application filed by Sinopec Engineering Inc, China Petrochemical Corp filed Critical Sinopec Engineering Inc
Priority to CN201220481500.8U priority Critical patent/CN202912615U/en
Application granted granted Critical
Publication of CN202912615U publication Critical patent/CN202912615U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model relates to a protection device for preventing mechanical equipment from dropping. The protection device comprises buffer mechanisms, transmission mechanisms, drive mechanisms, brake mechanisms, a pair of brake steel wire ropes, a lifting steel wire rope and a main pull rod. The drive mechanisms are connected with the transmission mechanisms, one ends of the transmission mechanisms are connected with the brake mechanisms, and the other ends are connected with the main pull rod; the main pull rod is connected with the lifting steel wire rope; the buffer mechanisms are arranged at the upper ends of the brake steel wire ropes and comprise a group of sliders and pins; the sliders and the pins are perpendicularly fixed in the buffer mechanisms at intervals alternatively; and the upper ends of the brake steel wire ropes penetrate through space formed between the pins and the outer edges of the sliders in an S shape and are arranged in the buffer mechanisms. By means of the protection device, the brake steel wire ropes can be caught in the minimum time when the mechanical equipment drops, and the mechanical equipment can be prevented from dropping; and the protection device has the advantages of being large in braking force, short in response time, reliable in brake performance and long in service life.

Description

A kind of fender guard that prevents that mechanical equipment from falling
Technical field
The utility model relates to a kind of fender guard of mechanical equipment, be specifically related to a kind of prevent mechanical equipment from high falling fender guard.
Background technology
The Main Function that prevents the fender guard that mechanical equipment falls is to prevent that mechanical equipment from by high falling, guaranteeing construction safety when having an accident in the course of the work.Therefore, its braking force, stopping distance, reliability etc. there is higher requirement.
Existing falling proof device exists that braking force is less than normal, response time is partially long, the insecure shortcoming of deceleration and stopping performance.Because response time is partially long, the descending speed that equipment is done the movement of falling object is larger, will produce huge impact load like this, easily causes personnel's injury or the damage of other equipment.
The utility model content
In order to solve the not good defective of fall protection equipment braking effect of the prior art, the utility model has been designed and developed a kind of fender guard that prevents that mechanical equipment from falling.
Mentality of designing of the present utility model is as follows:
A kind of fender guard that prevents that mechanical equipment from falling comprises transmission device 2, driver train 3, stop mechanism 4, brake wire 6, hoisting cable 9 and main tie 16; Described driver train 3 is connected with described transmission device 2; And described transmission device 2 one ends are connected with described stop mechanism 4, and the other end of described transmission device 2 is connected with described main tie 16; The quantity of described brake wire 6 is a pair of, and described main tie 16 is connected with described hoisting cable 9.
Described device also comprises buffer gear 1, and described buffer gear 1 is arranged on the top of described fender guard; It is the upper end that described buffer gear 1 is arranged on described brake wire 6; Described buffer gear comprises one group of slide block 10 and one group of bearing pin 26; Described one group of slide block 10 and one group of bearing pin 26 alternate intervals are vertically fixed in the described buffer gear 1; The gap that the described bearing pin of the upper end edge of described brake wire 6 26 and slide block 10 outer rims form is S-shapedly passed and is arranged in the described buffer gear 1.
When hoisting cable 9 fracture, buffer gear 1 provides needed braking force for mechanical equipment slows down, and when reducing device fall to the impact of pylon.Described driver train 3 provides propulsion source for hindering falling of described mechanical equipment, described transmission device 2 is passed to stop mechanism 4 with this propulsion source, described stop mechanism 4 is finished the arresting of brake wire 6, and the braking that cooperates buffer gear 1 to realize mechanical equipment.
The effect of bearing pin 26 is that brake wire 6 is played guiding, and when the described brake wire 6 of screw rod 11 band movable sliders, 10 extruding, brake wire 6 is squeezed and forms a plurality of S shapes.The degree that screws by changing screw rod 11 can adjustable brake steel rope 6 degree of crook, thereby improve the friction force of brake wire 6, the Promoting Layered Buffer effect.
Described buffer gear 1 is a pair of, and it is separately positioned on a pair of described brake wire 6 upper ends; Described buffer gear 1 also comprises screw rod 11, and described slide block 10 be shaped as semicircle; The quantity of described screw rod 11 and described slide block 10 are complementary, and described screw rod 11 along continuous straight runs press closer on described slide block 10, and described screw rod 11 along continuous straight runs screw and drive the described brake wire 6 of described slide block 10 extruding.
Described stop mechanism 4 quantity are a pair of, and it is symmetricly set on hypomere in a pair of described brake wire 6; Each described stop mechanism 4 comprises voussoir box group 13, moving voussoir 14 and decides voussoir 15; Describedly decide voussoir 15 and moving voussoir 14 be arranged in parallel up and down, describedly decide voussoir 15 and be fixedly installed in the described voussoir box group 13, and describedly decide voussoir 15 and be fixed on the described brake wire 6; Described moving voussoir 14 is slidingly arranged on the described brake wire 6; Described voussoir box group 13 is arranged in described brake wire 6 both sides, and described voussoir box group 13 equidistantly holds the described voussoir 15 of deciding tightly in both sides, and namely described voussoir box group 13 is equidistantly held tightly on described brake wire 6;
Described moving voussoir 14 1 ends are provided with groove, and described transmission device 2 one ends are arranged in the groove of described moving voussoir 14.
Described transmission device 2 comprises bearing 12, connecting rod 18 and crossbeam 19; Described crossbeam 19 is arranged on described stop mechanism 4 tops and is slidingly arranged on the described brake wire 6, and described crossbeam 19 tops are connected with main tie 16; Described bearing 12 upper ends are connected with described crossbeam 19, and its lower end and described connecting rod 18 are connected and fixed; Described connecting rod 18 1 ends are connected with described main tie 16, and the other end is connected with the groove of moving voussoir 14.
In implementation, the material of described moving voussoir 14 is GCr15.
Described driver train 3 comprises operating spring 17; Described operating spring 17 upper ends are connected with described crossbeam 19, and the lower end is connected with described connecting rod 18 lower ends.
Described device also comprises guiding mechanism 5, described guiding mechanism 5 one ends are slidingly arranged in the described derrick track 8, the other end is slidingly arranged on the described brake wire 6, and described guiding mechanism 5 comprises track adjusting wheel 20, wheel shaft 21, bearing seat 22 and guiding wheel carrier 23; Described wheel shaft 21 passes described track adjusting wheel 20 vertically, and described wheel shaft 21 two ends are provided with described bearing seat 22, and described bearing seat 22 is fixed on the described guiding wheel carrier 23.
The effect of guiding mechanism 5 is that this device is positioned, and avoids equipment to shake in the course of the work too large, and plays the effect of guiding when equipment moves up and down.
Described fender guard also comprises derrick track 8 and stay bearing plate 24; The quantity of described derrick track 8 is a pair of, and its vertical summetry is arranged on a pair of described brake wire 6 outsides, and described derrick track 8 tops are fixed on the described stay bearing plate 24.
Described device also comprises strainer 7; Described strainer 7 is arranged on described brake wire 6 bottoms; And described brake wire 6 surfaces are zinc-plated material.
In implementation, strainer 7 adopts wire clips.Strainer 7 is to strain brake wire 6, makes brake wire 6 that certain tension force be arranged, and is unlikely to crooked, makes falling proof device without hindrance operation on brake wire 6.Behind the instruments such as chain block tension brake wire 6, block with the end of the equipment that is similar to wire clips with brake wire 6, and wire clips is fixed on the derrick track 8.
Described buffer gear 1 also comprises shell 25; Described slide block 10, bearing pin 26 and screw rod 11 all are located in the described shell 25, and described slide block 10 quantity are 1~3; The quantity of described bearing pin 26 is 2~4; The Facing material of described slide block 10 and bearing pin 26 is No. 45 steel.
Described device comprises fixed pulley 27 and boring winch 28; Described fixed pulley 27 and boring winch 28 all are fixed on described stay bearing plate 24 upper surfaces, and described hoisting cable 9 is walked around described fixed pulley 27 and captiveed joint with the cylinder in the described winch 28.
Principle of work of the present utility model is as follows:
When normal operation, after boring winch 28 energisings, by the hoisting cable 9 on the pulling fixed pulley 27 main tie 16 is pulled upwardly, because lever principle, operating spring 17 is stretched downwards, and amount of tension can be adjusted as required, drives moving sliding wedge 14 by connecting rod 18 and moves down, make between sliding wedge 14 and the brake wire 6 and leave enough gaps, equipment package vertically moves without hindrance.In case hoisting cable 9 fractures, the pulling force that main tie 16 makes progress disappears, operating spring 17 rapidly action recovers distortion, by connecting rod 18 flip the starting sliding wedge 14, a complete set of equipment moves downward under Action of Gravity Field simultaneously, because moving voussoir 14, deciding sliding wedge 15 is to be with sloping wedge structure, after connecting rod 18 upwards lifts moving sliding wedge 14, moving sliding wedge 14 voussoir box 13 interior movements upward, wedging brake wire 6 is simultaneously because the equipment self gravitation has Action of Gravity Field downwards, more wedge is tighter can to make voussoir, realizes arresting brake wire 6.After stop mechanism 4 is successfully arrested brake wire 6, equipment slows down needed power fully by buffer gear 1 generation, its principle that produces braking force is that with slide block 10 brake wire 6 to be extruded into several S curved, and brake wire 6 is crowded flat, and produces diastrophic friction force during twitch.Curved size, the crowded flat degree of S determined the corner scale decision the when adjustment of braking force relies on screw rod 11 to tighten by the degree of tightening of the screw rod 11 that promotes slide block 10.After hoisting cable 9 recovered normal operation, hoisting force was pulled upwardly main tie 16, and operating spring 17 is stretched downwards, retracts initial position thereby will move sliding wedge 14, finished to reset, and normal operation recovers in system.
Compared with prior art, characteristics of the present utility model are:
(1) safety of increase hydraulic decoking mechanical equipment;
(2) this equipment operating is simple, braking force is large, response time is short;
(3) this equipment deceleration and stopping performance is reliable, machine life is long;
Description of drawings
Fig. 1 is a kind of fender guard schematic diagram that prevents that mechanical equipment from falling of the present utility model;
Fig. 2 is the partial enlarged drawing of transmission device and driver train among Fig. 1;
Fig. 3 is the partial enlarged drawing of buffer gear among Fig. 1;
Fig. 4 is the partial enlarged drawing of stop mechanism among Fig. 1;
Fig. 5 a is the partial enlarged drawing of guiding mechanism among Fig. 1;
Fig. 5 b is the side-looking constructional drawing of Fig. 5 a;
Detailed description of main elements:
The 1-buffer gear; The 2-transmission device; The 3-driver train; The 4-stop mechanism; The 5-guiding mechanism;
The 6-brake wire; The 7-strainer; 8-derrick track; The 9-hoisting cable; The 10-slide block;
The 11-screw rod; The 12-bearing; 13-voussoir box; 14-moves voussoir; 15-decides voussoir; The 16-main tie;
The 17-operating spring; The 18-connecting rod; The 19-crossbeam; The 20-track adjusting wheel; The 21-wheel shaft; The 22-bearing seat;
The 23-wheel carrier that leads; The 24-stay bearing plate; The 25-shell; The 26-bearing pin; The 27-fixed pulley; The 28-boring winch;
Below in conjunction with the drawings and specific embodiments the utility model is described in more detail, protection domain of the present utility model is not limited to the following specific embodiment.
The specific embodiment
Shown in Fig. 1,2,3,4,5a, 5b; a kind of fender guard that prevents that mechanical equipment from falling comprises buffer gear 1, transmission device 2, driver train 3, stop mechanism 4, guiding mechanism 5, brake wire 6, strainer 7, derrick track 8, hoisting cable 9, main tie 16, stay bearing plate 24, fixed pulley 27 and boring winch 28.
Brake wire 6 is a pair of, and its surface is zinc-plated material.
Buffer gear 1 is a pair of, and it is separately positioned on a pair of brake wire 6 upper ends; Buffer gear 1 comprises shell 25, slide block 10, bearing pin 26 and screw rod 11.The quantity of described bearing pin 26 is 3, and the quantity of described slide block 10 is 2, slide block 10 be shaped as semicircle, 2 slide blocks 10 and 3 bearing pin 26 alternate intervals are vertically fixed in the shell 25; The gap that the upper end edge bearing pin 26 of brake wire 6 and slide block 10 outer rims form is S-shapedly passed and is arranged in the shell 25.The Facing material of slide block 10 and bearing pin 26 is No. 45 steel.
The quantity of screw rod 11 is 2, and screw rod 11 along continuous straight runs press closer on slide block 10, and screw rod 11 along continuous straight runs screw band movable slider 10 extruding brake wires 6.
Stop mechanism 4 quantity are a pair of, and it is symmetricly set on hypomere in a pair of brake wire 6; Each stop mechanism 4 comprises voussoir box group 13, moving voussoir 14 and decides voussoir 15; Decide voussoir 15 and moving voussoir 14 be arranged in parallel up and down, decide voussoir 15 and be fixedly installed in the voussoir box group 13, and decide voussoir 15 and be fixed on the brake wire 6; Moving voussoir 14 is slidingly arranged on the brake wire 6; Voussoir box group 13 is arranged in brake wire 6 both sides, and voussoir box 13 equidistantly holds the described voussoir 15 of deciding tightly in both sides, and namely voussoir box 13 is equidistantly held tightly on brake wire 6;
Moving voussoir 14 1 ends are provided with groove, and transmission device 2 one ends are arranged in the groove of moving voussoir 14; The material of moving voussoir 14 is GCr15.
Transmission device 2 comprises bearing 12, connecting rod 18 and crossbeam 19; Crossbeam 19 is arranged on stop mechanism 4 tops and is slidingly arranged on the brake wire 6, and crossbeam 19 tops are connected with main tie 16; Bearing 12 upper ends are connected with crossbeam 19, and its lower end and connecting rod 18 are connected and fixed; Connecting rod 18 1 ends are connected with main tie 16, and the other end is connected with the groove of moving voussoir 14.
Driver train 3 comprises operating spring 17; Operating spring 17 upper ends are connected with crossbeam 19, and the lower end is connected with connecting rod 18 lower ends.
Guiding mechanism 5 comprises track adjusting wheel 20, wheel shaft 21, bearing seat 22 and guiding wheel carrier 23; Wheel shaft 21 passes track adjusting wheel 20 vertically, and wheel shaft 21 two ends are provided with bearing seat 22, and bearing seat 22 is fixed on the guiding wheel carrier 23; Track adjusting wheel 20 is slidingly arranged in the derrick track 8, and guiding wheel carrier 23 is slidingly arranged on the brake wire 6.Track adjusting wheel 20, wheel shaft 21, bearing seat 22 all are installed on the guiding wheel carrier 23, and guiding wheel carrier 23 is fixed on falling proof device entablatrance 19.
The quantity of derrick track 8 is a pair of, and its vertical summetry is arranged on a pair of brake wire 6 outsides, and derrick track 8 tops are fixed on the stay bearing plate 24;
The quantity of strainer 7 is 2, and the two is separately positioned on a pair of brake wire 6 bottoms, and a pair of brake wire 6 is stretching.
Fixed pulley 27 and boring winch 28 all are fixed on stay bearing plate 24 upper surfaces, and hoisting cable 9 is walked around fixed pulley 27 and captiveed joint with the cylinder in the boring winch 28.
Technique scheme is a kind of embodiment of the present utility model, for those skilled in the art, on the basis that the utility model discloses application process and principle, be easy to make various types of improvement or distortion, and be not limited only to the described structure of the above-mentioned specific embodiment of the utility model, therefore previously described mode is preferably, and does not have restrictive meaning.

Claims (10)

1. a fender guard that prevents that mechanical equipment from falling comprises transmission device (2), driver train (3), stop mechanism (4), brake wire (6), hoisting cable (9) and main tie (16); Described driver train (3) is connected with described transmission device (2); And described transmission device (2) one ends are connected with described stop mechanism (4), and the other end of described transmission device (2) is connected with described main tie (16); The quantity of described brake wire (6) is a pair of, and described main tie (16) is connected with described hoisting cable (9); It is characterized in that:
Described device also comprises buffer gear (1), and described buffer gear (1) is arranged on the top of described fender guard; It is the upper end that described buffer gear (1) is arranged on described brake wire (6); Described buffer gear comprises one group of slide block (10) and one group of bearing pin (26); Described one group of slide block (10) and one group of bearing pin (26) alternate intervals are vertically fixed in the described buffer gear (1); The gap that the described bearing pin of upper end edge (26) of described brake wire (6) and slide block (10) outer rim form is S-shapedly passed and is arranged in the described buffer gear (1).
2. a kind of fender guard that prevents that mechanical equipment from falling according to claim 1 is characterized in that:
Described buffer gear (1) is a pair of, and it is separately positioned on a pair of described brake wire (6) upper end; Described buffer gear (1) also comprises screw rod (11), and described slide block (10) be shaped as semicircle; The quantity of described screw rod (11) and described slide block (10) are complementary, described screw rod (11) along continuous straight runs presses closer on described slide block (10), and described screw rod (11) along continuous straight runs screws the described slide block of drive (10) and pushes described brake wire (6).
3. a kind of fender guard that prevents that mechanical equipment from falling according to claim 1 is characterized in that:
Described stop mechanism (4) quantity is a pair of, and it is symmetricly set on hypomere in a pair of described brake wire (6); Each described stop mechanism (4) comprises voussoir box group (13), moving voussoir (14) and decides voussoir (15); Describedly decide voussoir (15) and moving voussoir (14) be arranged in parallel up and down, describedly decide voussoir (15) and be fixedly installed in the described voussoir box group (13), and describedly decide voussoir (15) and be fixed on the described brake wire (6); Described moving voussoir (14) is slidingly arranged on the described brake wire (6); Described voussoir box group (13) is arranged in described brake wire (6) both sides, and described voussoir box group (13) equidistantly holds the described voussoir (15) of deciding tightly in both sides, and namely described voussoir box group (13) is equidistantly held tightly on described brake wire (6);
Described moving voussoir (14) one ends are provided with groove, and described transmission device (2) one ends are arranged in the groove of described moving voussoir (14); The material of described moving voussoir (14) is GCr15.
4. it is characterized in that according to claim 1 or 3 described a kind of fender guards that prevent that mechanical equipment from falling:
Described transmission device (2) comprises bearing (12), connecting rod (18) and crossbeam (19); Described crossbeam (19) is arranged on described stop mechanism (4) top and is slidingly arranged on the described brake wire (6), and described crossbeam (19) top is connected with main tie (16); Described bearing (12) upper end is connected with described crossbeam (19), and its lower end and described connecting rod (18) are connected and fixed; Described connecting rod (18) one ends are connected with described main tie (16), and the other end is connected with the groove of moving voussoir (14).
5. a kind of fender guard that prevents that mechanical equipment from falling according to claim 1 is characterized in that:
Described driver train (3) comprises operating spring (17); Described operating spring (17) upper end is connected with described crossbeam (19), and the lower end is connected with described connecting rod (18) lower end.
6. according to claim 1, one of 3,5 described a kind of fender guards that prevent that mechanical equipment from falling, it is characterized in that:
Described device also comprises guiding mechanism (5), described guiding mechanism (5) one ends are slidingly arranged in the described derrick track (8), the other end is slidingly arranged on the described brake wire (6), and it comprises track adjusting wheel (20), wheel shaft (21), bearing seat (22) and guiding wheel carrier (23) described guiding mechanism (5); Described wheel shaft (21) passes described track adjusting wheel (20) vertically, and described wheel shaft (21) two ends are provided with described bearing seat (22), and described bearing seat (22) is fixed on the described guiding wheel carrier (23).
7. a kind of fender guard that prevents that mechanical equipment from falling according to claim 1 is characterized in that:
Described fender guard also comprises derrick track (8) and stay bearing plate (24); The quantity of described derrick track (8) is a pair of, and its vertical summetry is arranged on a pair of described brake wire (6) outside, and described derrick track (8) top is fixed on the described stay bearing plate (24).
8. according to claim 1, one of 2,3,5 described a kind of fender guards that prevent that mechanical equipment from falling, it is characterized in that:
Described device also comprises strainer (7); Described strainer (7) is arranged on described brake wire (6) bottom; And described brake wire (6) surface is zinc-plated material.
9. a kind of fender guard that prevents that mechanical equipment from falling according to claim 1 and 2 is characterized in that:
Described a pair of buffer gear (1) is separately positioned on a pair of described brake wire (6); Each described buffer gear (1) also comprises shell (25); Described slide block (10), bearing pin (26) and screw rod (11) all are located in the described shell (25), and described slide block (10) quantity is 1~3; The quantity of described bearing pin (26) is 2~4; The Facing material of described slide block (10) and bearing pin (26) is No. 45 steel.
10. a kind of fender guard that prevents that mechanical equipment from falling according to claim 1 is characterized in that:
Described device comprises fixed pulley (27) and boring winch (28); Described fixed pulley (27) and boring winch (28) all are fixed on described stay bearing plate (24) upper surface, and described hoisting cable (9) is walked around described fixed pulley (27) and captiveed joint with the cylinder in the described boring winch (28).
CN201220481500.8U 2012-09-19 2012-09-19 Protection device for preventing mechanical equipment from dropping Expired - Lifetime CN202912615U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201220481500.8U CN202912615U (en) 2012-09-19 2012-09-19 Protection device for preventing mechanical equipment from dropping

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201220481500.8U CN202912615U (en) 2012-09-19 2012-09-19 Protection device for preventing mechanical equipment from dropping

Publications (1)

Publication Number Publication Date
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104405435A (en) * 2014-12-05 2015-03-11 中国水利水电第十四工程局有限公司 Safety protection device for inclined shaft engineering construction
CN105460733A (en) * 2015-12-31 2016-04-06 长沙矿山研究院有限责任公司 Multistage protection device adapting to falling of vertical shaft lifting system container
CN106629307A (en) * 2016-12-26 2017-05-10 长沙矿山研究院有限责任公司 Lifting steel wire rope stalling protection device and application method thereof
CN108127471A (en) * 2017-12-21 2018-06-08 重庆臣凿科技有限公司 A kind of milling machine auxiliary device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104405435A (en) * 2014-12-05 2015-03-11 中国水利水电第十四工程局有限公司 Safety protection device for inclined shaft engineering construction
CN105460733A (en) * 2015-12-31 2016-04-06 长沙矿山研究院有限责任公司 Multistage protection device adapting to falling of vertical shaft lifting system container
CN105460733B (en) * 2015-12-31 2017-09-19 长沙矿山研究院有限责任公司 It is a kind of to adapt to the multi-stage protection device that mine shaft hoist system container falls
CN106629307A (en) * 2016-12-26 2017-05-10 长沙矿山研究院有限责任公司 Lifting steel wire rope stalling protection device and application method thereof
CN106629307B (en) * 2016-12-26 2018-11-20 长沙矿山研究院有限责任公司 A kind of boom hoist cable stall protector and its application method
CN108127471A (en) * 2017-12-21 2018-06-08 重庆臣凿科技有限公司 A kind of milling machine auxiliary device
CN108127471B (en) * 2017-12-21 2019-07-30 重庆臣凿科技有限公司 A kind of milling machine auxiliary device

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Granted publication date: 20130501

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