CN111285221A - Elevator speed limiter lifting force test device and method - Google Patents
Elevator speed limiter lifting force test device and method Download PDFInfo
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- CN111285221A CN111285221A CN202010275493.5A CN202010275493A CN111285221A CN 111285221 A CN111285221 A CN 111285221A CN 202010275493 A CN202010275493 A CN 202010275493A CN 111285221 A CN111285221 A CN 111285221A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
- B66B5/048—Testing of overspeed governor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0033—Force sensors associated with force applying means applying a pulling force
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Abstract
The invention relates to the field of elevator safety detection, and discloses an elevator speed limiter lifting force test device which comprises a test board, a lifting mechanism, a clamp, a force sensor and a control system, wherein the test board is used for detecting the lifting force of the elevator speed limiter; the lifting mechanism comprises a driving assembly, a lead screw and a moving platform; the lead screw is arranged in the vertical direction, one end of the lead screw is connected with the output end of the driving assembly, the other end of the lead screw is connected with the top of the test board, and the moving platform is connected with the lead screw through a lead screw nut; the clamp is installed on the moving platform through the tension sensor, the speed limiter is installed on the top end of the test platform, one end of a steel wire rope of the speed limiter is connected with the clamp, and the other end of the steel wire rope of the speed limiter is hung on the counterweight. The invention also discloses a method for testing the lifting force of the elevator speed limiter. The beneficial effects are that: rational in infrastructure, convenient operation starts the experiment through a computer key, and direct reading test result effectively improves experimental degree of accuracy and efficiency.
Description
Technical Field
The invention relates to the field of elevator safety detection, in particular to a device and a method for testing the lifting force of an elevator speed limiter.
Background
With the rapid development of economy in China, the manufacturing industry level is rapidly improved, the urbanization level is continuously accelerated, and the manufacturing quantity and the maintenance quantity of elevators in China are the first place in the world. How to improve the production quality of elevator products and how to ensure the safety of the elevators in use becomes two problems which are very concerned by the elevator industry in China.
The elevator speed limiter is a very important safety protection device for the elevator and is responsible for monitoring the speed of the elevator. When the speed of the elevator is out of control, the speed limiter electrical switch acts or mechanically acts to trigger other protection devices to act, so that the out-of-control elevator stops running, and the safety of the elevator is ensured.
The speed limiter-safety gear system is an important protection system of an elevator, when the elevator is out of control and falls downwards, the speed limiter mechanically acts, a speed limiter steel wire rope starts to pull the safety gear to act, and finally the out of control elevator is braked and stopped. According to the relevant standard requirements, when the speed limiter acts, the tension of the speed limiter is not less than the larger of the following two values: 1) twice the force required for the safety gear to function; 2) 300N. Simultaneously, the method requires that: the safety factor of the speed limiter steel wire rope is not less than 8, namely the ratio of the minimum breaking load of the speed limiter steel wire rope to the tension of the speed limiter rope generated when the speed limiter acts is not less than 8.
The existing speed limiter tensile force test device usually adopts a winding drum mechanism to stretch a speed limiter steel wire rope, the occupied space of the winding drum mechanism is large, and the rotation process has transverse movement, so that the speed limiter steel wire rope generates transverse stress, and the test result is inaccurate. To the problem that there is lateral shifting in cylinder mechanism, some patents adopt to increase the pulley and solve, but the pulley increases and leads to the space requirement of whole device big a lot, extravagant laboratory space. Because the experimental wire rope of every overspeed governor all needs to be changed, wire rope installs and generally needs the clamp plate to fix on the cylinder, consequently, need loosen the screw on the clamp plate when changing wire rope, then screws up, and dismouting efficiency is not high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the elevator speed limiter lifting force test device which is simple in structure, small in occupied space, high in effective test accuracy and high in efficiency. The invention also provides an elevator speed limiter lifting force test method for effectively improving test accuracy and efficiency.
The purpose of the invention is realized by the following technical scheme: a lift tensile test device for an elevator speed limiter comprises a test board, a lifting mechanism, a clamp, a tension sensor and a control system; the lifting mechanism comprises a driving assembly, a lead screw and a moving platform; the lead screw is arranged in the vertical direction, one end of the lead screw is connected with the output end of the driving assembly, the other end of the lead screw is connected with the top of the test board, and the moving platform is connected with the lead screw through a lead screw nut; the clamp is installed on the moving platform through the tension sensor, the speed limiter is installed on the top end of the test board, one end of a steel wire rope of the speed limiter is connected with the clamp in the vertical direction, the other end of the steel wire rope of the speed limiter is hung on a counterweight, and the tension sensor and the driving assembly are connected with the control system.
Furthermore, the lifting mechanism also comprises a guide shaft arranged along the vertical direction; the guide shaft is close to the lead screw, two ends of the guide shaft are respectively connected with the bottom and the top of the test board, and the moving platform is connected with the guide shaft in a sliding mode.
Further, the driving assembly comprises a motor, a speed reducer and a coupling; the output shaft of the motor is connected with the speed reducer, the output shaft of the speed reducer is connected with one end of the screw rod through the coupler, and the motor is connected with the control system.
Further, still include the support, the support sets up the bottom at the testboard to enclose into the guard space between with the testboard, the motor is installed in the support and is located this guard space.
Further, still include proximity switch and proximity switch down, go up proximity switch and proximity switch down and set up the one side at the testboard along vertical direction interval respectively to make the position of last proximity switch and proximity switch down corresponding with moving platform's stroke, go up proximity switch and proximity switch down and all be connected with control system.
Further, the control system comprises a computer, a motion control card, a signal conditioning circuit and a driver; the tension sensor is connected with the signal adjusting circuit, the signal adjusting circuit and the driver are both connected with the motion control card, the driver is connected with the driving assembly, and the motion control card is connected with the computer.
Furthermore, the clamp adopts a wedge-shaped stretching clamp, and the tension sensor adopts an S-shaped force sensor.
Furthermore, the test bench is the cabinet body that is the rectangle, the overspeed governor is installed in the upper surface of cabinet body roof, the wire rope at the both ends of overspeed governor all passes and is located the chamber that holds of the cabinet body behind the roof of the cabinet body, drive assembly is located the bottom that the chamber was held to the cabinet body, the one end and the output of drive assembly of lead screw are connected, the other end and the lower surface of cabinet body roof of lead screw are connected.
A lift force test method of an elevator speed limiter adopts the lift force test instrument of the elevator speed limiter, the speed limiter is placed on the upper surface of a cabinet body top plate, a speed limiter steel wire rope is installed on the speed limiter, one end of the steel wire rope is clamped on a clamp, and the other end of the steel wire rope is hung on a counterweight; when the speed limiter is in a mechanical action state, the motion control card controls the driver to drive the motor to work, so that the mobile platform moves downwards, and simultaneously receives signals on the tension sensor processed by the signal adjusting circuit; when the value on the tension sensor is not continuously increased any more, the motor stops moving, and the computer records the maximum tension value in the whole process, namely the maximum tension value of the speed limiter.
Further, the elevator speed limiter lifting force test method comprises the following steps:
s1, starting the computer and the test device, and moving the mobile platform upwards to the upper proximity switch;
s2, placing the speed governor on the upper surface of a top plate of the cabinet body, installing a speed governor steel wire rope provided by a speed governor manufacturer on the speed governor, clamping one end of the speed governor steel wire rope on a clamp, hanging a counterweight at the other end of the speed governor steel wire rope, and adjusting the speed governor to be in a mechanical triggering state;
s3, a start command is clicked on the computer, the motion control card controls the driver to drive the motor to work, the mobile platform moves downwards, and signals on the tension sensor processed by the signal adjusting circuit are received;
s4, when the value on the tension sensor is not continuously increased any more, the motor stops working, the computer records the maximum value of the tension sensor in the whole process, namely the maximum value of the lifting force of the speed limiter, and the single speed limiter lifting force test is completed.
Compared with the prior art, the invention has the following advantages:
1. the testing device adopts the screw rod mechanism to complete the lifting movement, has compact structure and saves the testing space; in the test process, a mobile platform is used for vertically applying tension to the steel wire rope of the speed limiter, so that the accuracy of the test result is ensured; the wedge-shaped stretching clamp is connected with the steel wire rope, so that the steel wire rope can be rapidly dismounted and mounted, and the test efficiency is improved. The device is provided with the control system, so that the pulling force value can be directly displayed, and the accuracy and efficiency of the test are improved.
2. Be provided with upper and lower proximity switch and the driver with motion control card matched with in this test device, the position of upper and lower proximity switch is corresponding with moving platform's stroke, and the driver is used for the work of control motor, and when moving platform was close to last proximity switch or proximity switch down, proximity switch was with signal transmission to motion control card to control motor work can use manpower sparingly through this setting, improves experimental security.
3. According to the elevator speed limiter pulling force test method, pulling force is vertically applied to the speed limiter steel wire rope by the aid of matching of the motor, the lead screw and the moving platform, the control system is arranged, the test is started by one key of the computer, test results are directly read, and test accuracy and efficiency are effectively improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic structural diagram of an elevator speed limiter lifting force test device according to the invention;
fig. 2 shows a working principle diagram of an elevator speed limiter lifting force test device according to the invention;
in the figure, 1 is a test station; 2, a clamp; 3 is a tension sensor; 4 is a lead screw; 5 is a mobile platform; 6 is a speed limiter; 7 is a steel wire rope; 8 is a counterweight; 9 is a guide shaft; 10 is a motor; 11 is a speed reducer; 12 is a coupling; 13 is a bracket; 14 is an upper proximity switch; and 15 is a lower proximity switch.
Detailed Description
The invention is further illustrated by the following figures and examples.
The elevator speed limiter lifting force test device shown in fig. 1 and 2 comprises a test bench 1, a lifting mechanism, a clamp 2, a force sensor 3 and a control system; the lifting mechanism comprises a driving assembly, a lead screw 4 and a moving platform 5; the lead screw 4 is arranged in the accommodating cavity of the test board 1 along the vertical direction, one end of the lead screw 4 is connected with the output end of the driving assembly, the other end of the lead screw 4 is connected with the top of the test board 1, and the moving platform 5 is connected with the lead screw 4 through a lead screw nut; the clamp 2 is installed on a moving platform 5 through a tension sensor 3, the speed limiter 6 is installed on the top end of the test platform 1, one end of a steel wire rope 7 of the speed limiter 6 is connected with the clamp 2 in the vertical direction, the other end of the steel wire rope 7 of the speed limiter 6 is suspended on a counterweight 8, and the tension sensor 3 and a driving assembly are both connected with a control system. The other end of the screw rod 4 is rotatably connected with the top of the test bench 1 (such as a bearing and the like), and the moving platform 5 is installed on the screw rod through a screw rod nut and can move up and down along the length direction of the screw rod 4. When the driving assembly works, the moving platform 5 can move up and down along the length direction of the lead screw 4, so that the steel wire rope 7 of the speed limiter 6 is pulled along the vertical direction, the tension sensor 3 is connected with the control system, and tension signals are transmitted to the control system to be directly displayed.
In the device, the lead screw 4 and the mobile platform 5 are matched to pull the steel wire rope 7 of the speed limiter 6, the whole structure is reasonable in arrangement, the occupied space is small, the transverse movement cannot be generated, the control precision is high, and the accuracy of a test result is ensured; the clamp 2 is adopted to clamp the steel wire rope 7 at one end of the speed limiter 6, so that the steel wire rope 7 can be rapidly dismounted and mounted, and the test efficiency is improved; the tension sensor 3 is connected with the mobile platform and the clamp, so that tension signals are directly transmitted to a computer to be displayed, and the test accuracy and efficiency are improved.
The lifting mechanism also comprises a guide shaft 9 arranged along the vertical direction; the guide shaft 9 is close to the lead screw 4, two ends of the guide shaft 9 are respectively connected with the bottom and the top of the test bench 1, and the moving platform 5 is connected with the guide shaft 9 in a sliding mode. As shown in fig. 1, the movable platform 5 has a through hole through which the guide shaft 9 passes and is movable up and down along the guide shaft. The arrangement can ensure that the movable platform 5 cannot incline, and ensure the running stability of the screw rod 4 and the movable platform 5.
The driving assembly comprises a motor 10, a speed reducer 11 and a coupling 12; an output shaft of the motor 10 is connected with a speed reducer 11, an output shaft of the speed reducer 11 is connected with one end of the screw rod 4 through a coupler 12, and the motor 10 is connected with a control system. The motor 10 is connected with a driver in a control system, and the driver controls the motor to work.
The testing device further comprises a support 13, wherein the support 13 is arranged at the bottom of the testing platform 1 and forms a protection space with the testing platform 1, and the motor 10 is installed on the support 13 and is located in the protection space. As shown in figure 1, the support is L-shaped as a whole, the motor is located in a protection space formed by the support 13, a bottom plate and a side plate of the test bench 1 in an enclosing mode, and the counterweight 8 can be prevented from falling off and damaging the motor 10.
Still include proximity switch 14 and proximity switch 15 down, go up proximity switch 14 and proximity switch 15 and set up the one side at the testboard along vertical direction interval respectively down to make the position of last proximity switch 14 and proximity switch 15 down corresponding with moving platform 5's stroke, go up proximity switch 14 and proximity switch 15 down and all be connected with control system. The upper proximity switch 14 and the lower proximity switch 15 are respectively installed at the upper position and the lower position on one side surface of the test platform and correspond to the stroke of the moving platform 5. When the mobile platform runs to the position of the upper proximity switch 14 or the lower proximity switch 15, the upper proximity switch 14 or the lower proximity switch 15 is turned on, the motion control card acquires the signal change of the upper proximity switch 14 or the lower proximity switch 15, and the motor 10 is controlled to stop running. Through setting up upper and lower proximity switch, can control moving platform 5's stroke, prevent that moving platform 5 displacement from excessive, damage overspeed governor 6 or testboard 1 etc. guarantee the security of experimentation.
The control system comprises a computer, a motion control card, a signal conditioning circuit and a driver; the tension sensor is connected with a signal adjusting circuit, the signal adjusting circuit and the driver are both connected with a motion control card, the driver is connected with the motor 10, and the motion control card is connected with a computer. The tension sensor 3 is installed on the moving platform 5, the clamp 2 is installed on the upper portion of the tension sensor, and the tension sensor 3 and the clamp 2 move up and down along with the moving platform 5. The tension signal on the tension sensor 3 is amplified and buffered by the signal regulating circuit and transmitted to an ADC (analog to digital converter) interface of the motion control card, and finally transmitted to a computer for display. The upper and lower proximity switches are connected with a motion control card, and the motion control card controls a driver according to signals transmitted by the upper and lower proximity switches so as to control the working state of the motor.
The tension sensor adopts an S-shaped force transducer, the maximum measuring range reaches 10000N, the precision reaches 0.1 percent, and the standard requirement is met by 1 percent.
The clamp 2 adopts a wedge-shaped stretching clamp, and has the advantages of convenience in use, reliability in clamping, large load and the like. Adopt anchor clamps 2 to be connected with overspeed governor 6's wire rope 7, easy dismounting guarantees that wire rope is vertical downwards, can not produce lateral displacement, effectively improves test efficiency and experimental accuracy.
The motor 10 adopts a three-phase alternating current asynchronous motor, and has the characteristics of simple structure, easy manufacture, low cost, reliable operation, convenient maintenance, firmness and durability, and good working characteristics. The driver controls the motor 10 to rotate forward and backward, so that the lifting motion of the mobile platform 5 is realized.
The reducer 11 adopts a planetary reducer, and has the characteristics of small volume, light weight, high bearing capacity, long service life, stable operation, low noise, large output torque, large speed ratio, high efficiency and safe performance. The high-speed small-torque rotary motion output by the motor 10 is converted into low-speed large-torque rotary motion through the planetary reducer, so that the mobile platform 5 is ensured to have enough tension and small lifting speed.
The upper proximity switch 14 and the lower proximity switch 15 are completely the same, and both adopt photoelectric proximity switches, so that the photoelectric proximity switch has the advantages of short response time and high resolution.
The counterweight 8 is composed of standard weights, at least comprises 5 weights of 10Kg, 1 weight of 5Kg and 4 weights of 1Kg, and the number and weight of the weights can meet the test requirements.
The test board 1 is a rectangular cabinet body, the speed limiter 6 is installed on the upper surface of a top plate of the cabinet body, the steel wire ropes 7 at two ends of the speed limiter 6 penetrate through the top plate of the cabinet body and then are located in a containing cavity of the cabinet body, the driving assembly is located at the bottom of the containing cavity of the cabinet body, one end of the lead screw 4 is connected with the output end of the driving assembly, and the other end of the lead screw 4 is connected with the lower surface of the top plate of the cabinet body.
The test bench 1 comprises a top plate, a bottom plate and at least two side plates, wherein a cabinet body with a containing cavity is formed by the top plate, the bottom plate and the side plates in a surrounding mode. Overspeed governor 6 is installed in the upper surface of cabinet body roof, and it has the through hole to open on the roof, and the wire rope 7 of the overspeed governor 6 of being convenient for passes. Counter weight 8, anchor clamps 2, tension sensor 3, lead screw 4, moving platform 5, support 13 and drive assembly all set up in the chamber that holds of the cabinet body. Wherein, support 13 cooperatees with roof, curb plate and encloses into the guard space, and motor 10 and reduction gear 11 all are arranged in the guard space and install on support 13, and the output shaft of reduction gear 11 passes support 13 after be connected with lead screw 4 through shaft coupling 12. In order to facilitate the observation of the test process, at least one side surface of the test platform 1 is made of transparent material or is not provided with a side plate.
A lift force test method of an elevator speed limiter comprises the steps that the speed limiter 6 is placed on the upper surface of a top plate of a cabinet body, a steel wire rope 7 of the speed limiter 6 is installed on the speed limiter 6, one end of the steel wire rope 7 is clamped on a clamp 2, and a counterweight 8 is hung at the other end of the steel wire rope; when the speed limiter 6 is in a mechanical action state, the motion control card controls the driver to drive the motor 10 to work, so that the moving platform 5 moves downwards and receives signals on the tension sensor processed by the signal adjusting circuit; when the value on the tension sensor is not continuously increased any more, the motor stops moving, and the computer records the maximum tension value in the whole process, namely the maximum tension value of the speed limiter.
An elevator speed limiter lifting force test method comprises the following steps:
s1, starting the computer and the test device, and moving the mobile platform upwards to the upper proximity switch;
s2, placing the speed governor on the upper surface of the top plate of the cabinet body, installing a speed governor steel wire rope provided by a manufacturer on the speed governor, clamping one end of the speed governor steel wire rope on a clamp, hanging a counterweight at the other end of the speed governor steel wire rope, adding the weight of the counterweight 8 according to data provided by the manufacturer, and manually placing the speed governor in a mechanical triggering state;
s3, a start command is clicked on the computer, the motion control card controls the driver to drive the motor to work, the mobile platform moves downwards, and signals on the tension sensor processed by the signal adjusting circuit are received;
s4, when the value on the tension sensor is not continuously increased any more, the motor stops working, the computer records the maximum value of the tension sensor in the whole process, namely the maximum value of the lifting force of the speed limiter, and the single speed limiter lifting force test is completed.
The above-mentioned embodiments are preferred embodiments of the present invention, and the present invention is not limited thereto, and any other modifications or equivalent substitutions that do not depart from the technical spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. The utility model provides a tensile test device is carried to elevator overspeed governor which characterized in that: the device comprises a test board, a lifting mechanism, a clamp, a tension sensor and a control system; the lifting mechanism comprises a driving assembly, a lead screw and a moving platform; the lead screw is arranged in the vertical direction, one end of the lead screw is connected with the output end of the driving assembly, the other end of the lead screw is connected with the top of the test board, and the moving platform is connected with the lead screw through a lead screw nut; the clamp is installed on the moving platform through the tension sensor, the speed limiter is installed on the top end of the test board, one end of a steel wire rope of the speed limiter is connected with the clamp in the vertical direction, the other end of the steel wire rope of the speed limiter is hung on a counterweight, and the tension sensor and the driving assembly are connected with the control system.
2. The elevator governor lifting force test device according to claim 1, characterized in that: the lifting mechanism also comprises a guide shaft arranged along the vertical direction; the guide shaft is close to the lead screw, two ends of the guide shaft are respectively connected with the bottom and the top of the test board, and the moving platform is connected with the guide shaft in a sliding mode.
3. The elevator governor lifting force test device according to claim 1, characterized in that: the driving assembly comprises a motor, a speed reducer and a coupling; the output shaft of the motor is connected with the speed reducer, the output shaft of the speed reducer is connected with one end of the screw rod through the coupler, and the motor is connected with the control system.
4. The elevator governor lifting force test device according to claim 1, characterized in that: the motor is arranged on the support and located in the protection space.
5. The elevator governor lifting force test device according to claim 1, characterized in that: still include proximity switch and proximity switch down, go up proximity switch and proximity switch down and set up the one side at the testboard along vertical direction interval respectively to make the position of last proximity switch and proximity switch down corresponding with moving platform's stroke, go up proximity switch and proximity switch down and all be connected with control system.
6. The elevator governor lifting force test device according to claim 1, characterized in that: the control system comprises a computer, a motion control card, a signal conditioning circuit and a driver; the tension sensor is connected with the signal adjusting circuit, the signal adjusting circuit and the driver are both connected with the motion control card, the driver is connected with the driving assembly, and the motion control card is connected with the computer.
7. The elevator governor lifting force test device according to claim 1, characterized in that: the clamp adopts a wedge-shaped stretching clamp, and the tension sensor adopts an S-shaped force transducer.
8. The elevator governor lifting force test device according to claim 1, characterized in that: the test bench is a rectangular cabinet body, the speed limiter is installed on the upper surface of a top plate of the cabinet body, steel wire ropes at two ends of the speed limiter penetrate through the top plate of the cabinet body and then are located in a containing cavity of the cabinet body, the driving assembly is located at the bottom of the containing cavity of the cabinet body, one end of the lead screw is connected with the output end of the driving assembly, and the other end of the lead screw is connected with the lower surface of the top plate of the cabinet body.
9. An elevator speed limiter lifting force test method adopts the elevator speed limiter lifting force test instrument of any one of claims 1-8, and is characterized in that: the speed limiter is placed on the upper surface of a top plate of the cabinet body, a speed limiter steel wire rope is installed on the speed limiter, one end of the steel wire rope is clamped on the clamp, and the other end of the steel wire rope is hung on a counterweight; when the speed limiter is in a mechanical action state, the motion control card controls the driver to drive the motor to work, so that the mobile platform moves downwards, and simultaneously receives signals on the tension sensor processed by the signal adjusting circuit; when the value on the tension sensor is not continuously increased any more, the motor stops moving, and the computer records the maximum tension value in the whole process.
10. The elevator governor lifting force test method of claim 9, comprising the steps of:
s1, starting the computer and the test device, and moving the mobile platform upwards to the upper proximity switch;
s2, placing the speed governor on the upper surface of a top plate of the cabinet body, clamping one end of a steel wire rope of the speed governor on a clamp, hanging a counterweight at the other end of the steel wire rope, and adjusting the speed governor to be in a mechanical triggering state;
s3, a start command is clicked on the computer, the motion control card controls the driver to drive the motor to work, the mobile platform moves downwards, and signals on the tension sensor processed by the signal adjusting circuit are received;
s4, when the value on the tension sensor is not continuously increased any more, the motor stops working, the computer records the maximum value of the tension sensor in the whole process, namely the maximum value of the lifting force of the speed limiter, and the single speed limiter lifting force test is completed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112985666A (en) * | 2021-02-19 | 2021-06-18 | 深圳市德同兴电子有限公司 | Speed-limiting tension detection device |
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| CN208327020U (en) * | 2018-05-29 | 2019-01-04 | 安徽固特福电子科技有限公司 | Desk type multifunctional elevator speed limiter testing device |
| CN208747411U (en) * | 2018-08-23 | 2019-04-16 | 大连徕特光电精密仪器有限公司 | The desk-top check system of elevator governor |
| CN212174169U (en) * | 2020-04-09 | 2020-12-18 | 广东省特种设备检测研究院 | Elevator overspeed governor carries tensile test device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112985666A (en) * | 2021-02-19 | 2021-06-18 | 深圳市德同兴电子有限公司 | Speed-limiting tension detection device |
| CN112985666B (en) * | 2021-02-19 | 2023-01-06 | 深圳市德同兴电子有限公司 | Speed-limiting tension detection device |
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