CN109911738B - Large tonnage instantaneous safety tongs - Google Patents
Large tonnage instantaneous safety tongs Download PDFInfo
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- CN109911738B CN109911738B CN201910266036.7A CN201910266036A CN109911738B CN 109911738 B CN109911738 B CN 109911738B CN 201910266036 A CN201910266036 A CN 201910266036A CN 109911738 B CN109911738 B CN 109911738B
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- 230000000694 effects Effects 0.000 abstract description 7
- 230000003139 buffering effect Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
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- 230000008569 process Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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Abstract
The invention discloses a large-tonnage instantaneous safety clamp, which comprises a safety clamp mounting plate (1) and two lifting plates (10), wherein two brake clamps (3) are arranged in a long groove of the safety clamp mounting plate (1), the two brake clamps (3) are respectively positioned at two sides of a guide rail (2), a brake wheel (4) is arranged at the bottom of each brake clamp (3), during braking, the brake clamps (3) drive the brake wheel (4) to slide upwards, the outer wall of the brake wheel (4) props against the guide rail (2) and extrudes the guide rail (2) to deform and be embedded into the guide rail (2) until a braking plane (3.1) of the brake clamp (3) is clung to the guide rail (2) to brake. The large-tonnage instantaneous safety tongs have the advantages that the braking wheels and the tongs blocks which are symmetrically arranged on two sides of the guide rail play a braking role simultaneously, and the braking distance can be increased, so that the braking is more gentle and the effect is better.
Description
Technical Field
The invention relates to the technical field of elevator parts, in particular to a large-tonnage instantaneous safety tongs for more than 20 tons.
Background
An instantaneous safety gear device for an elevator is a safety gear device for emergently stopping and clamping a car on a guide rail when the speed of the elevator exceeds the speed set by a speed limiter under the operation of the speed limiter or when suspension ropes are broken and loosened. Which provides an effective protection for the safe operation of the elevator and is generally mounted on a car frame or counterweight frame.
The safety tongs comprise a speed limiting rope, a movable rod, a limiting rod, a brake wheel sliding block and a brake wheel, wherein the safety tongs are composed of two identical brake structures and are arranged on two sides of the guide rail in a distributed mode, the speed limiting rope is arranged at the middle section of the movable rod, one end of the movable rod is fixedly arranged on the safety tongs, the brake wheel is arranged at one end of the movable rod, the brake wheel sliding block is fixedly arranged on the safety tongs through a fastener, and the brake wheel sliding block is connected with the limiting rod. The design of two braking makes the safety tongs and the guide rail evenly stressed, reduces the deformation of the guide rail in the practical process, reduces the harm in the operation of the elevator, greatly enhances the braking effect and ensures the service life and the safety of the elevator. The safety tongs with the structure are symmetrically arranged, so that the deformation of the guide rail in the use process can be reduced, but the braking is realized through the friction between the braking wheel and the guide rail and the friction between the braking wheel and the sliding block of the inclined braking wheel during the braking, and the braking contact surface is between the outer side of the braking wheel and the guide rail, namely, the braking is realized only by the braking wheel, so that the braking force is limited and the safety tongs are only suitable for elevators with smaller cabins.
The safety tongs are characterized by comprising a tongs seat, a first elastic piece and a first tongs block and a second tongs block which are expected to be symmetrically arranged by a lifting mechanism; the first clamp block is connected with the clamp seat through the lifting mechanism; the second clamp block is connected with the clamp seat through a first elastic piece; the pulling mechanism is configured to control the first jaw block to approach the second jaw block; a buffer part is arranged on one side of the first clamp block, which is close to the second clamp block; the cushioning portion is configured to reduce impact that occurs when the first jaw moves. The safety tongs with the structure can brake by means of the first clamp block and the second clamp block, and after the first clamp block and the second clamp block are propped against the guide rail, the first clamp block and the second clamp block move the compression spring upwards at the moment to enable the braking effect to be started until the first clamp block and the second clamp block are completely compressed, so that the lift car is braked. The spring is used for buffering and smoothly braking, but the real braking still depends on the first clamp block and the second clamp block, so that the braking effect is limited, and due to the arrangement of the spring, the braking distance process of the braking pattern is overlong but the real braking distance is not changed, a certain potential safety hazard exists, and the buffering effect is limited.
Disclosure of Invention
The invention aims to solve the technical problem of providing the large-tonnage instantaneous safety tongs which adopt the brake wheels and the clamp blocks which are symmetrically arranged at two sides of the guide rail to play a role in braking simultaneously, can increase the braking distance and enable the braking to be more gentle and have better effect.
The invention provides a large-tonnage instantaneous safety tongs with the following structure, which comprises a safety tongs mounting plate and two lifting plates, wherein the front center of the safety tongs mounting plate is provided with a long groove for a guide rail to be embedded, the bottom width of the long groove is larger than the width of the top, the two lifting plates are positioned at two sides of the guide rail, the bottoms of the two lifting plates are positioned in the long groove of the safety tongs mounting plate, and the top of the two lifting plates extends out of the top of the safety tongs mounting plate, and the large-tonnage instantaneous safety tongs are characterized in that: two brake calipers are arranged in the long groove of the safety clamp mounting plate, the two brake calipers are respectively positioned at two sides of the guide rail, the top of each brake caliper at each side is fixedly connected with a corresponding lifting plate, one side, close to the guide rail, of each brake caliper is a braking plane, the other side of each brake caliper is an inclined plane attached to the side wall of the long groove, and a brake wheel is arranged at the bottom of each brake caliper and is in rotary connection with the brake calipers; during normal conditions, the intervals are arranged between the outer wall of the brake wheel and the guide rail, the braking plane of the brake caliper and the guide rail, and the interval between the braking plane of the brake caliper and the guide rail is larger than the interval between the outer wall of the brake wheel and the guide rail; during braking, the brake caliper drives the brake wheel to slide upwards, the outer wall of the brake wheel abuts against the guide rail and extrudes the guide rail to deform and is embedded into the guide rail until the braking plane of the brake caliper is tightly attached to the guide rail to brake.
The brake caliper is small at the top and large at the bottom, and the minimum distance between one side of the guide rail and the side wall of the long groove of the safety caliper mounting plate at the same side is smaller than the maximum width of the bottom of the brake caliper.
And a guide structure is arranged when each brake caliper slides upwards.
The guiding structure is characterized in that a guiding cover plate is arranged on the outer side of each brake caliper, the guiding cover plate is fixed on the safety caliper mounting plate, two first positioning rods are arranged on the front face of each brake caliper, two second positioning rods are arranged on the back face of each brake caliper, a first guiding groove for sliding of the two first positioning rods is formed in the guiding cover plate, and a second guiding groove for sliding of the two second positioning rods is formed in the bottom of a long groove of the safety caliper mounting plate.
The brake wheel is provided with a limiting structure.
The limiting structure is characterized in that a bracket is arranged at the bottom of the brake caliper, long holes are formed in the front plate and the rear plate of the bracket, a shaft is arranged at the center of the brake wheel, the shaft is arranged in the long holes of the front plate and the rear plate of the bracket, two sides of the guide rail are respectively provided with a support rod, the support rods are positioned between the shaft and the guide rail and are higher than the lowest part of the brake wheel, and the outer wall of the brake wheel is propped against the outer wall of the support rods and the side wall of the long groove of the safety caliper mounting plate.
The diameter of the brake wheel is larger than the maximum width of the bottom of the brake caliper.
During braking, the brake caliper drives the brake wheel to slide upwards, the outer wall of the brake wheel abuts against the guide rail and extrudes the guide rail to deform, the guide rail forms a groove, and the outer wall of the brake wheel is embedded into the groove.
After adopting the structure, the invention has the following advantages: the brake wheels and the clamp blocks which are symmetrically arranged on two sides of the guide rail are used for braking, namely, two groups of brake wheels and the clamp blocks are used for braking, when the brake is applied, the brake clamps drive the brake wheels to slide upwards, the outer walls of the brake wheels are propped against the guide rail and squeeze the guide rail to deform and are embedded into the guide rail until the braking plane of the brake clamps is tightly attached to the guide rail for braking. The invention adopts the brake wheel to brake and then the brake caliper to brake, namely double brake, and both the brake wheel and the brake caliper directly act on the guide rail, so the braking effect is good. In addition, the brake wheel is firstly propped against the guide rail and brakes, at the moment, the downward speed of the rapidly-descending car is slowed down under the action of the brake wheel until the brake caliper brakes with the guide rail, and the brake wheel at the moment can play a role of buffering, so that the car brakes more gently. And the braking distance of the car is increased from the start of braking of the brake wheel to the stop of the brake caliper, namely, the braking distance is increased, the downward impact force of the car is effectively eliminated by the brake wheel, and the car can be braked more gently. Moreover, the brake wheel is embedded into the guide rail, so that the brake wheel can play a role in guiding when the brake caliper and the guide rail are braked, and the brake caliper can be braked with the guide rail more stably.
The brake caliper is improved to be small at the top and large at the bottom, and the minimum distance between one side of the guide rail and the side wall of the long groove of the safety caliper mounting plate at the same side is smaller than the maximum width of the bottom of the brake caliper, so that the brake wheel can be braked with the guide rail first, then the brake caliper and the guide rail can be braked, and finally, the brake effect of the brake wheel and the guide rail can be guaranteed.
As an improvement, the guiding structure is that a guiding cover plate is arranged on the outer side of each brake caliper, the guiding cover plate is fixed on the safety caliper mounting plate, two first positioning rods are arranged on the front face of each brake caliper, two second positioning rods are arranged on the back face of each brake caliper, a first guiding groove for the sliding of the two first positioning rods is arranged on the guiding cover plate, and a second guiding groove for the sliding of the two second positioning rods is arranged at the bottom of a long groove of the safety caliper mounting plate.
As an improvement, the limiting structure is that a bracket is arranged at the bottom of the brake caliper, long holes are formed in the front plate and the rear plate of the bracket, a shaft is arranged at the center of the brake wheel, the shaft is arranged in the long holes of the front plate and the rear plate of the bracket, two sides of the guide rail are respectively provided with a support rod, the support rods are positioned between the shaft and the guide rail and are higher than the lowest part of the brake wheel, and the outer wall of the brake wheel is propped against the outer wall of the support rods and the side wall of the long groove of the safety caliper mounting plate. The brake wheel is assembled, so that the brake wheel can be assembled in theory due to the limit of the side wall of the safety gear mounting plate and the support rod, but is not easy to assemble in actual conditions. After the long holes are added, the structure enables the brake wheel to have a certain range of left-right offset, can facilitate the installation of the brake wheel, and can be well limited between the side wall of the safety tongs mounting plate and the support rod, thereby avoiding noise caused by resonance.
When the brake caliper is used for braking, the brake caliper drives the brake wheel to slide upwards, the outer wall of the brake wheel abuts against the guide rail and extrudes the guide rail to deform, the guide rail forms a groove, the outer wall of the brake wheel is embedded into the groove, and the groove can play a role in guiding the brake wheel.
Drawings
Fig. 1 is a schematic view of a partially exploded construction of a large tonnage instantaneous safety gear of the present invention.
Fig. 2 is a schematic perspective view of a large tonnage instantaneous safety gear according to the present invention.
Fig. 3 is a schematic front view of the large tonnage instantaneous safety gear of the present invention.
Fig. 4 is a schematic structural view of the large tonnage instantaneous safety gear of the invention without a guide cover plate.
Fig. 5 is a schematic cross-sectional view of A-A of fig. 3.
Fig. 6 is a schematic view of the internal assembly of the large tonnage instantaneous safety gear of the present invention.
The figure shows:
1. The safety gear comprises a safety gear mounting plate, 1.1 parts of a second guide groove, 2 parts of a guide rail, 3 parts of a brake caliper, 3.1 parts of a brake plane, 3.1.1 parts of a long hole, 3.2 parts of an inclined plane, 34 parts of a brake wheel, 5 parts of a guide cover plate, 5.1 parts of a first guide groove, 6 parts of a first positioning rod, 7 parts of a second positioning rod, 8 parts of a support rod, 9 parts of a shaft, 10 parts of a lifting plate.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 to 6, the large tonnage instantaneous safety tongs of the present invention comprises a safety tongs mounting plate 1 and two lifting plates 10, wherein the front center of the safety tongs mounting plate 1 is provided with a long groove for embedding a guide rail 2, the bottom width of the long groove is larger than the width of the top, the two lifting plates 10 are positioned at two sides of the guide rail 2, the bottoms of the two lifting plates are positioned in the long groove of the safety tongs mounting plate 1, and the top of the lifting plates extends out of the top of the safety tongs mounting plate 1, and the large tonnage instantaneous safety tongs are characterized in that: two brake calipers 3 are arranged in the long groove of the safety gear mounting plate 1, the two brake calipers 3 are respectively positioned at two sides of the guide rail 2, the top of each brake caliper 3 at each side is fixedly connected with a corresponding lifting plate 10, one side, close to the guide rail 2, of each brake caliper 3 is a brake plane 3.1, the other side is an inclined plane 3.2 attached to the side wall of the long groove, the brake plane 3.1 is parallel to the side surface of the guide rail 2, and the brake calipers 3 are in a right trapezoid shape with narrow upper part and wide lower part. During operation, the brake caliper 3 is driven upwards by the lifting plate 10, the inclined surface 3.2 of the brake caliper 3 is upwards attached to the side wall of the long groove, and the brake caliper 3 is upwards and simultaneously approaches the guide rail 2 until the braking plane 3.1 of the brake caliper 3 is attached to the guide rail and braked. The bottom of each brake caliper 3 is provided with a brake wheel 4, and the brake wheels 4 are rotationally connected with the brake calipers 3.
In normal times, the intervals are arranged between the outer wall of the brake wheel 4 and the guide rail 2, and between the brake plane 3.1 of the brake caliper 3 and the guide rail 2, and the interval between the brake plane 3.1 of the brake caliper 3 and the guide rail is larger than the interval between the outer wall of the brake wheel 4 and the guide rail 2; i.e. the brake wheel 4 is not in contact with the rail 2, nor is the braking plane 3.1 of the brake caliper 3 in contact with the rail 2, and the outer wall of the brake wheel 4 is closer to the rail 2.
During braking, the lifting plate 10 pulls the brake caliper 3 upwards, the brake caliper 3 drives the brake wheel 4 to slide upwards, the outer wall of the brake wheel 4 is propped against the guide rail 2 firstly because of small distance between the brake wheel 4 and the guide rail 2, the brake wheel 4 is extruded to deform the guide rail 2 and is embedded into the guide rail 2 because of large downward impact of a car, at the moment, the guide rail 2 is extruded by the brake wheel 4 to form a groove, and the outer wall of the brake wheel 4 is embedded into the groove until a braking plane 3.1 of the brake caliper 3 is tightly attached to the guide rail 2 to brake. The brake wheel 4 is in rolling connection during braking.
The brake caliper 3 is small at the top and large at the bottom, namely, is in a right trapezoid shape. The minimum distance between one side of the guide rail 2 and the side wall of the long groove of the safety gear mounting plate 1 on the same side is smaller than the maximum width of the bottom of the brake caliper 3, so that the brake caliper 3 can brake in the long groove and can be prevented from sliding out of the long groove.
The brake caliper 3 is provided with a guide structure when sliding upwards, the guide structure means that the outer side of each brake caliper 3 is provided with a guide cover plate 5, the guide cover plate 5 is fixed on the safety caliper mounting plate 1, the front surface of each brake caliper 3 is provided with two first positioning rods 6, the back surface is provided with two second positioning rods 7, the guide cover plate 5 is provided with a first guide groove 5.1 for the sliding of the two first positioning rods 6, and the bottom of a long groove of the safety caliper mounting plate 1 is provided with a second guide groove 1.1 for the sliding of the two second positioning rods 7. When the brake caliper 3 slides on the net, the two first positioning rods 6 slide in the first guide grooves 5.1, and the two second positioning rods 7 slide in the second guide grooves 1.1, so that the function of a guide rail is achieved, and the upward sliding direction of the brake caliper 3 is ensured.
The brake wheel 4 is provided with a limiting structure, the limiting structure means that a bracket 3.1 is arranged at the bottom of the brake caliper 3, long holes 3.1.1 are formed in front and rear plates of the bracket 3.1, a shaft 9 is arranged at the center of the brake wheel 4, a center hole is formed in the brake wheel 4, the shaft 9 is arranged in the center hole, and the brake wheel 4 rotates around the shaft 9. The shaft 9 is arranged in the long holes 3.1.1 of the front plate and the rear plate of the bracket 3.1, two sides of the guide rail 2 are respectively provided with a supporting rod 8, the supporting rods 8 are positioned between the shaft 9 and the guide rail 2 and are higher than the lowest part of the brake wheel 4, the outer wall of the brake wheel 4 is propped against the outer wall of the supporting rods 8 and the side wall of the long groove of the safety tongs mounting plate 1, so that the brake wheel 4 takes the shaft 9 as the center, the outer wall of the brake wheel 4 and the outer wall of the supporting rods 8 are first supporting points, and the side wall of the long groove of the outer wall safety tongs mounting plate 1 of the brake wheel 4 is second supporting point, thereby limiting the brake wheel.
The diameter of the brake wheel 4 is larger than the maximum width of the bottom of the brake caliper 3.
Claims (6)
1. The utility model provides a large-tonnage instantaneous safety tongs, includes safety tongs mounting panel (1) and two lift arm-tie (10), the positive center of safety tongs mounting panel (1) is equipped with the elongated slot that supplies guide rail (2) embedding, the bottom width of elongated slot is greater than the width at top, two lift arm-tie (10) are located the both sides and the bottom of guide rail (2) are located the elongated slot of safety tongs mounting panel (1), and the top stretches out in safety tongs mounting panel (1) top, its characterized in that: two brake calipers (3) are arranged in the long groove of the safety clamp mounting plate (1), the two brake calipers (3) are respectively positioned at two sides of the guide rail (2), the top of each brake caliper (3) at each side is fixedly connected with a corresponding lifting plate (10), one side, close to the guide rail (2), of each brake caliper (3) is a brake plane (3.1), the other side is an inclined plane (3.2) attached to the side wall of the long groove, and a brake wheel (4) is arranged at the bottom of each brake caliper (3), and the brake wheel (4) is rotationally connected with the brake calipers (3); during normal conditions, the intervals are arranged between the outer wall of the brake wheel (4) and the guide rail (2) and between the brake plane (3.1) of the brake caliper (3) and the guide rail (2), and the interval between the brake plane (3.1) of the brake caliper (3) and the guide rail is larger than the interval between the outer wall of the brake wheel (4) and the guide rail (2); during braking, the brake caliper (3) drives the brake wheel (4) to slide upwards, the outer wall of the brake wheel (4) abuts against the guide rail (2) and extrudes the guide rail (2) to deform and be embedded into the guide rail (2) until a braking plane (3.1) of the brake caliper (3) is tightly attached to the guide rail (2) to brake; the brake caliper (3) is small at the top and large at the bottom, and the minimum distance between one side of the guide rail (2) and the side wall of the long groove of the safety caliper mounting plate (1) at the same side is smaller than the maximum width of the bottom of the brake caliper (3); and a guide structure is arranged when each brake caliper (3) slides upwards.
2. A large tonnage instantaneous safety gear according to claim 1, characterized in that: the guiding structure is characterized in that a guiding cover plate (5) is arranged on the outer side of each brake caliper (3), the guiding cover plate (5) is fixed on a safety caliper mounting plate (1), two first positioning rods (6) are arranged on the front face of each brake caliper (3), two second positioning rods (7) are arranged on the back face of each brake caliper, first guiding grooves (5.1) for the two first positioning rods (6) to slide are formed in the guiding cover plate (5), and second guiding grooves (1.1) for the two second positioning rods (7) to slide are formed in the bottoms of long grooves of the safety caliper mounting plate (1).
3. A large tonnage instantaneous safety gear according to claim 1, characterized in that: the brake wheel (4) is provided with a limiting structure.
4. A large tonnage instantaneous safety gear according to claim 3, characterized in that: the limiting structure is characterized in that a bracket (3.1) is arranged at the bottom of the brake caliper (3), long holes (3.1.1) are formed in the front plate and the rear plate of the bracket (3.1), a shaft (9) is arranged at the center of the brake wheel (4), the shaft (9) is arranged in the long holes (3.1.1) of the front plate and the rear plate of the bracket (3.1), a supporting rod (8) is respectively arranged at two sides of the guide rail (2), the supporting rod (8) is located at the position between the shaft (9) and the guide rail (2) and is higher than the lowest position of the brake wheel (4), and the outer wall of the brake wheel (4) is abutted against the outer wall of the supporting rod (8) and the side wall of the long groove of the safety caliper mounting plate (1).
5. A large tonnage instantaneous safety gear according to claim 1, characterized in that: the diameter of the brake wheel (4) is larger than the maximum width of the bottom of the brake caliper (3).
6. A large tonnage instantaneous safety gear according to claim 1, characterized in that: during braking, the brake caliper (3) drives the brake wheel (4) to slide upwards, the outer wall of the brake wheel (4) abuts against the guide rail (2) and extrudes the guide rail (2) to deform, the guide rail (2) forms a groove, and the outer wall of the brake wheel (4) is embedded into the groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910266036.7A CN109911738B (en) | 2019-04-03 | 2019-04-03 | Large tonnage instantaneous safety tongs |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910266036.7A CN109911738B (en) | 2019-04-03 | 2019-04-03 | Large tonnage instantaneous safety tongs |
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| Publication Number | Publication Date |
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| CN109911738A CN109911738A (en) | 2019-06-21 |
| CN109911738B true CN109911738B (en) | 2024-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910266036.7A Active CN109911738B (en) | 2019-04-03 | 2019-04-03 | Large tonnage instantaneous safety tongs |
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| CN (1) | CN109911738B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110921455B (en) * | 2019-12-25 | 2024-06-04 | 山西迎才物流设备科技有限公司 | Double-track air flow speed control safety tongs |
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|---|---|---|---|---|
| CN202729512U (en) * | 2012-08-30 | 2013-02-13 | 南通爱利特机电制造有限公司 | Large-tonnage progressive elevator safety tongs |
| WO2016058256A1 (en) * | 2014-10-16 | 2016-04-21 | 邹家春 | Weightless safety clamp |
| JP2016064893A (en) * | 2014-09-25 | 2016-04-28 | 株式会社日立製作所 | Emergency stop device for elevator |
| CN205855677U (en) * | 2016-07-22 | 2017-01-04 | 广东华辉电梯配件有限公司 | A kind of progressive safety gear |
| CN207090720U (en) * | 2017-05-25 | 2018-03-13 | 快奥电梯有限公司 | A kind of novel elevator safety tongs |
| CN108069314A (en) * | 2017-12-21 | 2018-05-25 | 镇江朝阳机电科技有限公司 | A kind of electromagnetic type triggers safety tongs |
| CN208071049U (en) * | 2016-08-22 | 2018-11-09 | 泊头市恒发机械制造有限公司 | Using the elevator of progressive safety gear |
| CN209778002U (en) * | 2019-04-03 | 2019-12-13 | 宁波奥德普电梯部件有限公司 | Large-tonnage instantaneous safety tongs |
-
2019
- 2019-04-03 CN CN201910266036.7A patent/CN109911738B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202729512U (en) * | 2012-08-30 | 2013-02-13 | 南通爱利特机电制造有限公司 | Large-tonnage progressive elevator safety tongs |
| JP2016064893A (en) * | 2014-09-25 | 2016-04-28 | 株式会社日立製作所 | Emergency stop device for elevator |
| WO2016058256A1 (en) * | 2014-10-16 | 2016-04-21 | 邹家春 | Weightless safety clamp |
| CN205855677U (en) * | 2016-07-22 | 2017-01-04 | 广东华辉电梯配件有限公司 | A kind of progressive safety gear |
| CN208071049U (en) * | 2016-08-22 | 2018-11-09 | 泊头市恒发机械制造有限公司 | Using the elevator of progressive safety gear |
| CN207090720U (en) * | 2017-05-25 | 2018-03-13 | 快奥电梯有限公司 | A kind of novel elevator safety tongs |
| CN108069314A (en) * | 2017-12-21 | 2018-05-25 | 镇江朝阳机电科技有限公司 | A kind of electromagnetic type triggers safety tongs |
| CN209778002U (en) * | 2019-04-03 | 2019-12-13 | 宁波奥德普电梯部件有限公司 | Large-tonnage instantaneous safety tongs |
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| CN109911738A (en) | 2019-06-21 |
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