CN113340729A - Car wallboard test fixture - Google Patents
Car wallboard test fixture Download PDFInfo
- Publication number
- CN113340729A CN113340729A CN202110585109.6A CN202110585109A CN113340729A CN 113340729 A CN113340729 A CN 113340729A CN 202110585109 A CN202110585109 A CN 202110585109A CN 113340729 A CN113340729 A CN 113340729A
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- car
- moving mechanism
- wallboard
- force measuring
- car wallboard
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- 238000012360 testing method Methods 0.000 title claims abstract description 84
- 230000001174 ascending effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 description 8
- 230000005389 magnetism Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a lift car wallboard testing tool which comprises a cart main body, a locking device and a force measuring device, wherein the cart main body is provided with a liftable workbench; the locking device is used for locking the movement of the trolley main body relative to the car wall plate; the force measuring device comprises a force measuring tool and a moving mechanism, the force measuring tool is connected with the moving mechanism, and the moving mechanism is movably arranged on the workbench, so that a force measuring end of the force measuring tool can be abutted against a set test point on the car wallboard to be tested, the pressure exerted on the force measuring tool can be kept constant, the mechanical strength of the car wallboard can be tested conveniently, and the test efficiency is improved.
Description
Technical Field
The invention relates to the field of elevator car manufacturing, in particular to a car wall plate testing tool.
Background
Most of the elevator cars are the elevator cars, after the elevator cars stop stably, the doors of the corresponding floors are opened, users enter the elevators, the doors of the corresponding floors are closed, the elevator cars transmit the users to the corresponding floors in the shafts, the elevator cars are spaces spliced by metal plates, and the mechanical strength of the car wall plates needs to be tested in the manufacturing process. At present, the sedan-chair wallboard mainly tests its intensity through the dynamometer, and when the exclusive use dynamometer tested it, the power of exerting on the dynamometer was difficult to keep invariable, when having a plurality of test points moreover, changed the test point and need remeasure the height, not only the operation is inconvenient, and efficiency is not high.
Disclosure of Invention
The invention aims to provide a car wall plate testing tool which can keep the force applied to a force measuring tool constant, is convenient for testing the mechanical strength of a car wall plate and improves the testing efficiency.
The purpose of the invention is realized by adopting the following technical scheme:
a car wallboard testing tool comprises:
the trolley comprises a trolley main body, a trolley handle and a trolley handle, wherein the trolley main body can move and can lock the moving position of the trolley main body;
the force measuring device comprises a force measuring tool and a moving mechanism, wherein the moving mechanism is arranged on the workbench and connected with the force measuring tool, and the moving mechanism is used for moving the force measuring tool so that a force measuring end of the force measuring tool can be abutted against a test point set on a wall plate of the car to be tested.
Furthermore, a first screw is fixedly arranged on the workbench and arranged along the vertical direction of the to-be-tested car wall plate, and the moving mechanism is in threaded connection with the first screw so that the moving mechanism can be movably arranged on the workbench.
Further, the moving mechanism comprises a first ejector rod which is of a hollow structure, an inner cavity of the first ejector rod is in threaded connection with the first screw rod, a connecting portion is arranged at the end portion, close to the wall plate of the lift car to be tested, of the first ejector rod, and the connecting portion is used for being connected with the force measuring tool.
Furthermore, the moving mechanism further comprises a first rotating disc, and the first rotating disc is fixedly arranged on the first ejector rod.
Furthermore, the car wallboard testing tool further comprises an auxiliary testing device, wherein the auxiliary testing device is movably arranged on the workbench and is opposite to the force measuring device, so that the auxiliary testing device can be abutted against the car wallboard opposite to the car wallboard to be tested.
Further, the auxiliary testing device is in contact with the wall plate of the car in a magnetic attraction mode.
Furthermore, a second screw rod is fixedly arranged on the workbench and arranged along the vertical direction of the to-be-tested car wall plate, and the auxiliary testing device is in threaded connection with the second screw rod.
Furthermore, the auxiliary testing device comprises a second rotary table and a second ejector rod, the second ejector rod is fixedly arranged on the second rotary table and is arranged along the vertical direction of the to-be-tested car wall plate, and the second rotary table is in threaded connection with the screw rod.
Furthermore, one end, far away from the second turntable, of the second ejector rod is provided with a transverse baffle, and a magnet is arranged on the transverse baffle.
Further, the cart main body comprises a universal caster, a frame and a supporting tube, the supporting tube is arranged on the frame and can be telescopically adjusted, the universal caster is arranged at the bottom of the frame, and the workbench is arranged at the top of the supporting tube.
Compared with the prior art, the invention has the beneficial effects that:
the cart body is pushed into the car, is locked by the self-locking function of the cart body, is prevented from moving relative to the car wallboard, is fixed on the ground of the car, can be aligned to the set test point on the car wallboard to be tested by adjusting the lifting height of the workbench, and is pushed by the moving mechanism, so that the force measuring end of the force measuring tool is abutted to the set test point on the car wallboard to be tested until the test is finished, the pressure applied on the force measuring tool is kept constant, the mechanical strength of the car wallboard is convenient to test, and the test efficiency is improved.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a main view of the present invention;
fig. 3 is a schematic structural diagram of the connection between the first top rod and the first screw rod in the embodiment of the present invention.
In the figure: 1. a cart body; 10. a universal caster; 11. a frame; 110. an outer square tube; 111. a foot pedal; 12. supporting a tube; 2. a work table; 20. a slide rail; 3. a force measuring device; 30. a first ejector rod; 300. a connecting portion; 301. a long groove; 31. a first turntable; 4. a long screw; 40. a first screw; 41. a second screw; 42. a first fixed part; 43. a second fixed part; 5. an auxiliary test device; 50. a second ejector rod; 500. a transverse baffle plate; 5000. a magnet; 51. a second turntable.
Detailed Description
The present invention will be described with reference to the accompanying drawings and the detailed description, and it should be noted that, in the following description, various embodiments or technical features may be arbitrarily combined to form a new embodiment without conflict.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "vertical", "top", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The implementation mode is as follows:
as shown in fig. 1-3, the invention discloses a car wallboard testing tool, which comprises a cart main body 1 and a force measuring device 3, wherein the cart main body 1 can move and can lock the moving position thereof, so that the cart main body can be pushed into a car and can lock the moving position thereof; the cart main body 1 is provided with a locking device (not shown) for self-locking of the cart main body 1 so as to lock the movement of the cart main body 1 relative to the car wall plate; the force measuring device 3 comprises a force measuring tool and a moving mechanism, the moving mechanism is arranged on the workbench 2 and is connected with the force measuring tool (not shown), and the moving mechanism is used for moving the force measuring tool so that a force measuring end of the force measuring tool can be abutted against a set test point on the car wall plate to be tested. When the test platform is used, the trolley main body 1 is pushed into a car, the movement of the trolley main body 1 relative to a car wallboard is locked through the locking device, the trolley main body 1 is fixed on the ground of the car, then the force measuring tool can be aligned to a set test point on the car wallboard to be tested by adjusting the lifting height of the workbench 2, and finally the force measuring tool is pushed through the moving mechanism, so that the force measuring end of the force measuring tool is abutted to the set test point on the car wallboard to be tested until the test is completed, the pressure exerted on the force measuring tool is kept constant, the mechanical strength of the car wallboard is conveniently tested, and the test efficiency is improved.
In this embodiment, moving mechanism promotes the dynamometry instrument through the mode of spiral removal, and the dynamometry instrument is the dynamometer for the dynamometry end of dynamometer can contradict with the test point of setting for on the car wallboard that awaits measuring, reaches the effect of slowly testing car wallboard mechanical strength, makes the test effect better. Specifically, the first screw 40 is fixedly arranged on the workbench 2, the first screw 40 is arranged along the vertical direction of the to-be-tested car wallboard, the moving mechanism is in threaded connection with the first screw 40, namely the moving mechanism is in threaded connection with the first screw 40, so that the moving mechanism can be movably arranged on the workbench 2, the moving mechanism can push the dynamometer to move along the direction of the to-be-tested car wallboard, and the force measuring end of the dynamometer is enabled to be abutted against the test point on the to-be-tested car wallboard. Specifically, the moving mechanism comprises a first ejector rod 30, the first ejector rod 30 is of a hollow structure, an inner cavity of the first ejector rod 30 is in threaded connection with a first screw 40, namely the inner cavity of the first ejector rod 30 is provided with an internal thread connected with the thread on the screw, the end part of the first ejector rod 30 close to the car wall plate to be tested is provided with a connecting part 300, and the connecting part 300 is used for being connected with a force measuring tool, namely a force measuring meter. Of course, the force measuring end of the dynamometer is perpendicular to the car wallboard to be tested, so that the force measuring end of the dynamometer can be abutted against the test point on the car wallboard to be tested. It should be noted that the connection portion 300 is a stud, and the dynamometer also has a threaded hole that is screwed into the stud, thereby facilitating the attachment and detachment of the dynamometer thread. In order to facilitate the rotation of the first mandril 30 to push the dynamometer to move towards the direction of the to-be-tested car wallboard, the moving mechanism further comprises a first rotating disc 31, the first rotating disc 31 is fixedly arranged on the first mandril 30, the first mandril 30 can be driven to rotate in a threaded manner by rotating the first rotating disc 31, and therefore the dynamometer is pushed to move towards the direction of the to-be-tested car wallboard, and the operation is convenient.
On the basis of the structure, the car wallboard testing tool further comprises an auxiliary testing device 5, wherein the auxiliary testing device 5 is movably arranged on the workbench 2 and is arranged opposite to the force measuring device 3 so as to be abutted against the car wallboard opposite to the car wallboard to be tested. Also can understand, when the moving mechanism promotes the dynamometer and the test point conflict on the car wallboard that awaits measuring tests, accessible removes auxiliary test device 5 and supports with one side car wallboard for the car wallboard that awaits measuring and presses, can prevent that the moving mechanism from promoting the dynamometer and the test point conflict on the car wallboard that awaits measuring from leading to shallow main part 1 slope when testing, influence test effect. It is worth explaining here that this auxiliary testing device 5 contacts with the car wallboard through the mode of magnetism, because the car is formed by the sheet metal component concatenation, sets up magnet 5000 at the one end that auxiliary testing device 5 kept away from workstation 2 and can realize the magnetism of auxiliary testing device 5 and car wallboard and inhale to make auxiliary testing device 5 can support with the car wallboard fast and press, improve the efficiency of test.
In this embodiment, the auxiliary testing device 5 has the same moving mode as the moving mechanism, the second screw 41 is fixedly disposed on the working platform 2, the second screw 41 is disposed along the vertical direction of the car wall plate to be tested, and the auxiliary testing device 5 is in threaded connection with the second screw 41. Specifically, the auxiliary testing device 5 includes a second turntable 51 and a second ejector pin 50, the second ejector pin 50 is fixedly arranged on the second turntable 51 and arranged along the vertical direction of the car wall plate to be tested, the second turntable 51 is in threaded connection with the second screw 41, and the second ejector pin 50 can be driven to make a spiral motion by rotating the second turntable 51 so as to push the second ejector pin 50 to be pressed against the car wall plate.
Here, the second screw 41 and the first screw 40 are substantially formed by one long screw 4, that is, the first screw 40 is a first end of the long screw 4, and the second screw 41 is a second end of the long screw 4. The long screw 4 has a first fixing portion 42 and a second fixing portion 43 at the bottom thereof, and the long screw 4 is fixed to the table 2 by the respective fixing portions and each of the fixing portions is movable in the lateral direction of the table 2, the lateral direction of the table 2 being defined as a direction perpendicular to the direction in which the long screw 4 is spirally advanced. Each fixed part passes through slide rail 20 and 2 sliding connection of workstation to realize its effect along the removal of workstation 2's transverse direction, thereby be convenient for above-mentioned moving mechanism and auxiliary test device 5's lateral adjustment, the dynamometry end of being convenient for further adjusting the dynamometer is contradicted with the test point on the examination car wallboard that awaits measuring, makes test effect better. Certainly, in order to avoid the first fixing portion 42 moving the first push rod 30 along the direction of the car wall panel to be tested, the bottom of the first push rod 30 is provided with a long groove 301, the long groove 301 is arranged along the direction that the first push rod 30 moves towards the car wall panel to be tested, and when the first rotating disc 31 is rotated, the first push rod 30 can be driven to move towards the direction of the car wall panel to be tested.
Therefore, as can be understood by those skilled in the art, the second push rod 50 and the first push rod 30 are located at the same horizontal plane, so that the inclination of the cart body 1 can be further prevented when the first push rod 30 pushes the dynamometer to collide with a test point on a car wallboard to be tested for testing, and the test effect of the car wallboard testing tool of the present invention is better. Certainly, in order to enlarge the contact area between the second ejector rod 50 and the car wall plate and to make the pressing effect between the second ejector rod 50 and the car wall plate better, the end of the second ejector rod 50 away from the second turntable 51 is provided with the transverse baffle 500, and is pressed against the car wall plate through the transverse baffle 500, of course, the magnet 5000 is arranged on the transverse baffle 500, so that the transverse baffle 500 is quickly fixed to the car wall plate in a magnetic attraction manner.
In this embodiment, the cart body 1 includes a caster 10, a frame 11, and a support tube 12, the support tube 12 is disposed on the frame 11 and can be telescopically adjusted, the caster 10 is disposed at the bottom of the frame 11, and the workbench 2 is disposed at the top of the support tube 12. The locking device (not shown) is provided on the caster 10, and the effect of moving the cart body 1 relative to the car wall panel is achieved by locking the movement of the caster 10. Since the locking device in this embodiment is a locking device commonly used in the art for locking the caster 10, the principle of construction thereof will not be described in detail herein. In order to realize the height adjustment of the lifting of the workbench 2, the position where the frame 11 is connected with the supporting tube 12 is the outer square tube 110, the supporting tube 12 is the inner square tube, the workbench 2 is welded at the top of the inner square tube, the inner square tube and the outer square tube 110 are both provided with through holes and are fixedly connected by bolts, and the workbench 2 can be lifted and lowered by adjusting the relative height of the inner square tube and the outer square tube 110. Of course, the telescopic adjustment of the support tube 12 can be achieved by other means, such as driving the lifting device to lift, which is not limited herein. Therefore, the adjustment for the purpose of raising and lowering the work table 2 can be appropriately modified by those skilled in the art and should fall within the scope of the present invention.
In this embodiment, the frame 11 may further be provided with a pedal 111, and when a test point on the car wall panel to be tested is high, an operator may stand on the pedal 111 to rotate the first rotating disc 31 and the second rotating disc 51, so as to complete testing of the mechanical strength of the car wall panel.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. The utility model provides a car wallboard test fixture which characterized in that includes:
the trolley comprises a trolley main body (1), wherein the trolley main body (1) can move and can lock the moving position of the trolley main body, and a workbench (2) capable of ascending and descending is arranged on the trolley main body (1);
force measuring device (3), including dynamometry instrument and moving mechanism, moving mechanism locates on workstation (2) and with the dynamometry instrument is connected, moving mechanism is used for removing the dynamometry instrument, so that the dynamometry end of dynamometry instrument can contradict with the test point of setting for on the examination car wallboard.
2. The car wallboard testing tool of claim 1, wherein: the movable type elevator car wall plate testing device is characterized in that a first screw rod (40) is fixedly arranged on the workbench (2), the first screw rod (40) is arranged along the vertical direction of a car wall plate to be tested, and the moving mechanism is in threaded connection with the first screw rod (40) so that the moving mechanism can be movably arranged on the workbench (2).
3. The car wallboard testing tool of claim 2, wherein: the moving mechanism comprises a first ejector rod (30), the first ejector rod (30) is of a hollow structure, an inner cavity of the first ejector rod (30) is in threaded connection with a first screw rod (40), a connecting portion (300) is arranged at the end portion, close to a to-be-tested car wall plate, of the first ejector rod (30), and the connecting portion (300) is used for being connected with the force measuring tool.
4. The car wallboard testing tool of claim 3, wherein: the moving mechanism further comprises a first rotating disc (31), and the first rotating disc (31) is fixedly arranged on the first ejector rod (30).
5. The car wallboard testing tool of claim 1, wherein: the test device is characterized by further comprising an auxiliary test device (5), wherein the auxiliary test device (5) is movably arranged on the workbench (2) and is opposite to the force measuring device (3) so as to enable the auxiliary test device to be abutted against a car wallboard corresponding to the car wallboard to be tested.
6. The car wallboard testing tool of claim 5, wherein: the auxiliary testing device (5) is in contact with the wall plate of the lift car in a magnetic attraction mode.
7. The car wallboard testing tool of claim 5, wherein: the second screw rod (41) is fixedly arranged on the workbench (2), the second screw rod (41) is arranged along the vertical direction of the to-be-tested car wallboard, and the auxiliary testing device (5) is in threaded connection with the second screw rod (41).
8. The car wallboard testing tool of claim 7, wherein: the auxiliary testing device (5) comprises a second rotary table (51) and a second ejector rod (50), the second ejector rod (50) is fixedly arranged on the second rotary table (51) and is arranged along the vertical direction of the to-be-tested car wall plate, and the second rotary table (51) is in threaded connection with the second screw rod (41).
9. The car wallboard testing tool of claim 8, wherein: one end, far away from the second turntable (51), of the second ejector rod (50) is provided with a transverse baffle (500), and a magnet (5000) is arranged on the transverse baffle (500).
10. The car wallboard testing tool of claim 1, wherein: shallow main part (1) is including universal caster (10), frame (11) and stay tube (12), stay tube (12) are located but telescopic adjustment on frame (11), universal caster (10) are located the bottom of frame (11), workstation (2) set up in the top of stay tube (12).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN202110585109.6A CN113340729A (en) | 2021-05-27 | 2021-05-27 | Car wallboard test fixture |
Applications Claiming Priority (1)
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CN202110585109.6A CN113340729A (en) | 2021-05-27 | 2021-05-27 | Car wallboard test fixture |
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CN113340729A true CN113340729A (en) | 2021-09-03 |
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CN202110585109.6A Pending CN113340729A (en) | 2021-05-27 | 2021-05-27 | Car wallboard test fixture |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114295353A (en) * | 2021-12-28 | 2022-04-08 | 日立电梯(中国)有限公司 | Device for testing car strength |
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CN208441488U (en) * | 2018-04-24 | 2019-01-29 | 中铁二局集团有限公司 | A kind of packaged type assembled architecture prefabricated components short distance transportation device |
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CN111580328A (en) * | 2020-06-05 | 2020-08-25 | 南阳理工学院 | Adjustable soft light umbrella for photography |
CN211824975U (en) * | 2020-03-05 | 2020-10-30 | 淮北师范大学 | Anti-skidding elevator door strength detection device |
CN212807902U (en) * | 2020-08-18 | 2021-03-26 | 西安高压电器研究院有限责任公司 | Test device for verifying torsion resistance of complete power distribution equipment of public power grid |
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CN103217090A (en) * | 2013-04-27 | 2013-07-24 | 中山市鸿勋机械有限公司 | Elevator door cab wall and staircase skirt panel deformation test device |
CN207703376U (en) * | 2017-12-01 | 2018-08-07 | 广州昊硕智能科技有限公司 | A kind of impact test equipment |
CN208441488U (en) * | 2018-04-24 | 2019-01-29 | 中铁二局集团有限公司 | A kind of packaged type assembled architecture prefabricated components short distance transportation device |
CN109084140A (en) * | 2018-08-29 | 2018-12-25 | 绿源美味(天津)网络科技有限公司 | A kind of building monitoring device |
CN208897129U (en) * | 2018-09-28 | 2019-05-24 | 江苏通强电气设备有限公司 | A kind of low-voltage distribution cabinet transfer device and its power distribution cabinet |
CN109991087A (en) * | 2019-04-30 | 2019-07-09 | 广东省特种设备检测研究院(广东省特种设备事故调查中心) | A kind of portable multi-function elevator loading test device and its application method |
CN209945202U (en) * | 2019-07-09 | 2020-01-14 | 北京威睛光学技术有限公司 | Extended depth of field testing device |
CN211824975U (en) * | 2020-03-05 | 2020-10-30 | 淮北师范大学 | Anti-skidding elevator door strength detection device |
CN111580328A (en) * | 2020-06-05 | 2020-08-25 | 南阳理工学院 | Adjustable soft light umbrella for photography |
CN212807902U (en) * | 2020-08-18 | 2021-03-26 | 西安高压电器研究院有限责任公司 | Test device for verifying torsion resistance of complete power distribution equipment of public power grid |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN114295353A (en) * | 2021-12-28 | 2022-04-08 | 日立电梯(中国)有限公司 | Device for testing car strength |
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