CN112408279A - Spacing support device of platform operating system under water - Google Patents
Spacing support device of platform operating system under water Download PDFInfo
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- CN112408279A CN112408279A CN202011277026.2A CN202011277026A CN112408279A CN 112408279 A CN112408279 A CN 112408279A CN 202011277026 A CN202011277026 A CN 202011277026A CN 112408279 A CN112408279 A CN 112408279A
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- rod body
- support
- spring seat
- platform
- spring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
- F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention belongs to the technical field of underwater tests, and particularly relates to a limiting support device of an underwater platform lifting system. The invention can prevent the underwater platform from generating excessive shaking when being vertically lifted out of the water surface or vertically put into water from the air. The spring buffer device adopts the design of a bidirectional spring, the limit bracket can be buffered in two directions, a certain buffer space can be provided for the platform experimental device while the left-right shaking of the platform device is reduced, the problems that the platform experimental device cannot be positioned and the like caused by errors in the platform installation process are prevented, the risk that the limit bracket device is damaged by excessive external force is reduced, and the guide wheel cannot be derailed easily under the action of the spring force. The invention achieves good limiting and moving functions by utilizing the guide wheel guide rail, can effectively ensure that the hoisted experimental platform device cannot shake forwards and backwards when the guide wheel rolls on the angle steel rail, and enables heavy equipment to move straightly and vertically when the hoisting operation is carried out in a water tank.
Description
Technical Field
The invention belongs to the technical field of underwater tests, and particularly relates to a limiting support device of an underwater platform lifting system.
Background
The underwater test device is special in environment, equipment is in a state that real-time all-dimensional monitoring and manual intervention cannot be achieved, and operations of frequently fishing out the equipment on the water surface and putting the equipment into the water are involved when repeated test model filling, equipment suspension rust-proof storage and test device regular overhauling and maintenance are carried out, so that the underwater test device is very necessary to be provided with a lifting platform system. In order to ensure the specified structural strength and experimental requirements, the underwater test equipment is usually heavy, a large number of sensors and other precision facilities are installed, the manufacturing cost is high, and the underwater test equipment has extremely high requirements on stable, safe and reliable lifting and falling operation of the equipment into and out of water.
The lifting of the underwater test device usually adopts a steel wire rope hoisting platform to realize vertical water inlet and outlet movement, the platform hoisted by a multipoint steel wire rope is not suitable for strictly limiting the movement of the platform in a sliding rail way and other ways while realizing synchronous operation, otherwise, the platform and the rail are clamped due to the gravity center offset of platform equipment and other reasons, and the equipment failure rate and the overhauling difficulty are increased. However, the equipment is influenced by buoyancy and water flow fluctuation and can shake, and in order to ensure the normal operation of the equipment, the safety of the moving and lifting process of the platform and the installation and positioning after the equipment falls into water have higher requirements. The platform lifting operation that can manual intervention on the workshop flat ground is different from, and hoist and mount operating personnel does not have ground to support on the surface of water, so need equipment itself to possess functions such as spacing, prevent inclining. Therefore, in order to ensure the stable operation of the equipment and realize the functions of water outlet reloading, water inlet tests and the like, a set of special limiting support device needs to be designed for the lifting platform system of the overwater heavy equipment.
Disclosure of Invention
The invention aims to provide a limiting bracket device of an underwater platform lifting system, which can prevent an underwater platform from generating excessive shaking when the underwater platform is vertically lifted out of the water surface or vertically put into water from the air, and particularly can limit the platform to shake in the front-back direction.
The purpose of the invention is realized by the following technical scheme: the device comprises a platform fixing support, a limiting bracket and a spring damping component; the platform fixing support is composed of a connecting plate, a main plate and two pull plates, and the main plate and the two pull plates are vertically arranged on the top surface of the connecting plate; the main board is a square board; the pull plates are right-angle trapezoidal plates, and the right-angle edges of the two pull plates are respectively arranged on the left side and the right side of the back surface of the main plate; the front surface of the main board is provided with an L-shaped rod body support and a shock absorber support, and the shock absorber support is arranged below the L-shaped rod body support; the limiting bracket comprises an L-shaped rod body; the L-shaped rod body consists of a first rod body and a second rod body, the tail end of the first rod body is connected with the tail end of the second rod body to form an L shape, a support shaft mounting hole is formed in the joint of the first rod body and the second rod body, and the joint of the first rod body and the second rod body is mounted on an L-shaped rod body support on the front face of the mainboard through a support shaft; the first rod body is arranged above the second rod body, a guide wheel is arranged at the head end of the first rod body, and the guide wheel is arranged at the head end of the first rod body through a guide wheel shaft; the head end of the second rod body is provided with a supporting plate, and the bottom of the supporting plate is provided with a through hole; the spring vibration reduction assembly comprises a support connecting spring seat, a first spring seat, a second spring seat, a third spring seat and a screw rod; the support connecting spring seat is arranged on the shock absorber support on the front surface of the main board through a spring seat support shaft; the first spring seat is fixed on one side of the supporting plate at the head end of the second rod body and is positioned between the supporting plate and the support connecting spring seat, and the second spring seat is fixed on the other side of the supporting plate; the third spring seat is arranged in front of the second spring seat, one end of the third spring seat is provided with a screw fixing nut, and the other end of the third spring seat is connected with the second spring seat through a spring; the first spring seat is connected with the support connecting spring seat through a spring; one end of the screw is connected with the screw fixing nut, and the other end of the screw sequentially penetrates through the second spring seat, the through hole in the bottom of the supporting plate and the first spring seat and is connected with the support connecting spring seat.
The invention has the beneficial effects that:
the invention can prevent the underwater platform from generating excessive shaking when being vertically lifted out of the water surface or vertically put into water from the air, and particularly limit the shaking generated in the front-back direction of the platform. The spring vibration damper can reduce the left-right shaking of the platform device, and simultaneously can provide a certain buffer space for the platform experiment device, prevent the problems of incapability of positioning and the like caused by errors in the platform installation process, reduce the risk of damage of the limiting bracket device due to excessive external force, and prevent a guide wheel from being easily derailed under the action of the spring elasticity. The spring buffer device adopts the design of a bidirectional spring, and the limiting support can be buffered in two directions. The invention utilizes the guide wheel guide rail to achieve good limiting and moving functions, when the guide wheel rolls on the angle steel rail, the invention can effectively ensure that the hoisted experimental platform device cannot rock back and forth, when the guide wheel is lifted in a water tank, heavy equipment can vertically move straightly, the rolling friction of the guide wheel is very small, the invention can not generate moving resistance compared with the platform experimental device with huge weight, and can well replace the limiting function of workers, thereby ensuring the safety of the equipment and personnel in the moving process.
Drawings
Fig. 1 is an overall schematic view of the present invention.
FIG. 2 is a schematic composition of the present invention.
Fig. 3 is an exploded view of the present invention.
FIG. 4 is a schematic view of the platform mounting bracket of the present invention.
FIG. 5 is a schematic view of an L-shaped rod of the present invention.
Fig. 6 is a front view of the guide wheel of the present invention.
Fig. 7 is a side view of the idler of the present invention.
FIG. 8 is a partial schematic view of the present invention mounted on a test rig platform.
FIG. 9 is a general schematic of the present invention mounted on a test rig platform.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention belongs to the technical field of underwater tests, and particularly relates to a limiting support device of an underwater platform lifting system.
The invention aims to prevent the underwater platform from generating excessive shaking when the underwater platform is vertically lifted out of the water surface or vertically put into water from the air, and particularly limit the shaking generated in the front-back direction of the platform. Therefore, the limiting bracket device has the advantages of simple structure, convenience in installation, high reliability and easiness in disassembly and replacement of parts.
A limit bracket device 1 of a water transfer recovery system is shown in the attached figure 1, and mainly comprises the following components in the attached figure 2: platform fixing support 2, spacing support main part 3, guide pulley 4 and spring damping subassembly 5. Guide pulley subassembly 4 is installed on spacing support 3 and is contacted with the angle bar guide rail, and fixing support 2 passes through the bolt fastening on the top angle of experiment platform, and spacing support 3 then is installed on fixing support 2, and spring damping subassembly 5 links to each other with spacing support 3 and fixing support 2.
1. The platform fixing support 2 comprises a main plate 201, a coupling plate 202 and two pulling plates 203.
2. The limiting bracket main body 3 comprises an L-shaped rod body 301, a support 302 of the L-shaped rod body, support shaft sleeves 303 of two L-shaped rod bodies, a support shaft 304 of the L-shaped rod body, a fixing nut 305 of the support shaft and a cotter pin 306 (GB-T91-20002.345) matched with the fixing nut. Here, the nuts of the fixing shaft used for the limiting bracket main body 3, the guide wheel 4 and the spring damping assembly 5 are of the same type.
3. The guide wheel assembly 4 comprises a guide wheel 401, two guide wheel sleeves 402, a guide wheel shaft 403, a guide wheel shaft fixing nut 305 and a matched cotter pin 306 (GB-T91-20002.345).
4. The spring damping assembly 5 comprises a spring mounting screw 501, two springs 502, three spring seats 503, a spring mounting screw fixing nut 504, a matched cotter pin 505 (GB-T91-20002.355), a damper support 506, a support connecting spring seat 507, a spring seat support shaft 508, a support shaft fixing nut 305 and a matched cotter pin 306 (GB-T91-20002.345).
5. The connection and fixation mode of each component is described as follows:
a) bolt fixing mode: to secure the motherboard 201 to the top of the platform are five bolts 204(GB-T5782M 1225), mating washers 205(GB-T97_1-2002M12) and nuts. And the main plate 201, the coupling plate 202 and the pulling plate 203 are fixed together by electric welding to form a stable structure. The L-shaped rod holder 302 is fixed to the coupling plate 202 of the platform fixed support 2 by means of four bolts 307 of GB-T5782-2000M 1230 and M12 washers 205. The shock absorber mount 506 is fixed to the coupling plate 202 of the platform mount 2 by four bolts 509 and spacers 510(GB-T97_1-2002M10) of GB-T5782-2000M 1225.
b) The fixing mode of the support shaft and the cotter pin bolt is as follows: guide wheel shaft sleeves 402 are arranged on two sides of a hole of a guide wheel 401, the hole of the guide wheel 401 is aligned with a mounting hole (No. 1 hole) of an L-shaped rod body and then is inserted into a guide wheel shaft 403, and the other end of the guide wheel shaft is fixed by inserting a fixing nut 305 of the guide wheel shaft into a cotter pin 306 to prevent the guide wheel shaft 403 from falling off.
The connection between the L-shaped rod 301 and the support 302 of the L-shaped rod is similar to that of the guide wheel 401, the support axle sleeves 303 of the two L-shaped rods are firstly installed in the grooves (the hole No. 2 of the L-shaped rod), then the hole is aligned with the support 302 of the L-shaped rod and inserted into the support axle 304 of the L-shaped rod, and the other end of the support axle is inserted into the cotter pin 306 by the fixing nut 305 for fixing, so that the support axle 304 of the L-shaped rod is prevented from being separated.
A spring mounting screw 501 of the spring vibration reduction assembly 5 penetrates through a No. 3 hole of the L-shaped rod body 301, two spring seats 503 are respectively arranged at two ends of the spring mounting screw 501, the two spring seats 503 are fixedly connected with a platform where the No. 3 hole of the L-shaped rod body 301 is located, springs 502 are sleeved at two ends of the spring mounting screw 501, the left end of the spring mounting screw 501 is connected with and fixed to a support connecting spring seat 507, and the right end of the spring mounting screw 501 is fixed by a spring mounting screw fixing nut 504 and a matched cotter pin 505 after being provided with one spring seat 503; the spring seat support 507 is aligned with the damper support 506 at the hole position, and then the spring seat support shaft 508 is inserted, and the end of the shaft is fixed by the support shaft fixing nut 305 and the matching cotter pin 306.
6. The use process of the whole device and the functions and the characteristics of parts of each part.
The platform fixing support 2 is mainly used to fix the limiting device at four corners of the top of the platform, refer to fig. 4, 8 and 9, and also to fix the support 302 of the L-shaped rod and the spring seat support shaft 508. The guide wheel mainly plays a limiting role, and the groove of the guide wheel is matched with the angle iron track, as shown in fig. 8 and 9, so as to play a limiting role and prevent the platform device from moving towards the axial direction of the guide wheel. The L-shaped rod 301 is mainly provided with a guide wheel 301 and connected with the spring damping assembly 5 to form a whole set of buffer device. Referring to fig. 1, when the guide wheel 301 is pressed to move upward relative to the device during operation, the L-shaped rod 301 rotates counterclockwise around the support shaft 304 of the L-shaped rod, the spring mounting screw 501 also rotates counterclockwise around the spring seat support shaft 508, the spring length on the right side is shortened, the spring length on the left side is increased, the spring 502 provides a larger elastic force, the distance between the limiting device and the guide rail is gradually shortened, but the spring elastic force is gradually increased until the L-shaped rod 301 rotates for a certain angle and then is balanced in force. When the platform moves up and down after balancing, the guide wheels 301 roll along the guide rails to reduce the resistance force applied when the platform is lifted.
The invention has the beneficial effects that:
1. the guide wheel guide rail is utilized to achieve good limiting and moving functions. When guide pulley 301 rolls on the angle steel track, can effectively guarantee that the experimental platform device of hoist and mount can not rock from beginning to end, when carrying out lifting operation in the pond, make the straight vertical migration of heavy weight equipment, guide pulley 301's rolling friction is also very little, and the platform experimental apparatus of huge weight relatively can not produce the moving resistance to can be fine substitute workman's limiting displacement, guarantee to remove equipment and personnel's safety of in-process.
2. Good buffering effect. The spring damping device of patent when reducing platform device and controlling and rocking, can also give certain buffer space of platform experimental apparatus, prevents the unable location scheduling problem that arouses because of the error in the platform installation, reduces the risk that spacing support device received too big external force and damaged, and the effect of receiving spring 502 elasticity makes guide pulley 401 can not derail easily. The spring buffering device adopts the design of a bidirectional spring, the limiting support can be buffered in two directions, and the application range of the spring buffering device can be further enlarged by changing the length, the elastic coefficient and other parameters of the springs on two sides.
3. Simple but robust mechanical design. The platform fixing support 2 is made of firm and thick steel, the quality is stable and reliable, the limiting support main body is also made of L-shaped steel, all the hinging positions are formed by using metal supports and shaft sleeves, the platform fixing support is firm and durable and convenient to maintain, and the two support shafts 304508 and the guide wheel shaft 403 are convenient to disassemble, maintain and replace by using fixing bolts 305 of split pins. The limit device has no requirements on precise transmission and the like, can be placed in water or a humid place for a long time under actual working conditions, and is easily corroded by water and damaged if the bearing is used, so that the service life of the limit device is shortened. When the precise transmission requirement is not met, the service life of the device can be prolonged and the cost is reduced by using the hinging mode of the shaft sleeve and the rotating shaft adopted by the invention.
4. The whole set of device guarantees effective supporting force and service life, and simultaneously reduces the whole weight of the device and the bending bearing force of the support 302506 and the connecting bolt 307509 of the connecting plate 201 as much as possible, for example, the platform fixing support 2 and the limiting support main body 301 adopt a rib plate welding mode to achieve the purposes of reducing weight and reducing cost.
The working environment of the invention is that the indoor large water pool is contacted with water for a long time, the humidity is large, and the oil is required to be regularly applied and lubricated and the rust-proof treatment is well done.
The BOM table for the entire patented device is as follows: 2-platform fixed support, 3-limit support main body, 4-support guide wheel assembly, 5-spring vibration reduction assembly, 201-main plate, 202-connecting plate, 203-pulling plate, 5 204-bolts GB-T5782M 1225, 9 205-gaskets GB-T97_1-2002M12, 301-L rod body, support of 302-L rod body, support shaft sleeve of 2 303-L rod body, support shaft of 304-L rod body, fixing nut of 305-support shaft, 2 306-cotter pins GB-T91-20002.345, 4 307-bolts GB-T5782-2000M 1230, 401-guide wheel, 2 402-guide wheel shaft sleeve, 403-guide wheel shaft, 501-spring mounting screw, 2 502-spring, 3 503-spring seat, 504-spring mounting screw fixing nut, 505-cotter pin GB-T91-20002.355, 506-shock absorber support, 507-support connecting spring seat and 508-spring seat support shaft.
In assembling the device of this patent, the parts are assembled first, then mounted on the corresponding holders, and finally the entire device is fixed on the top surface of the platform. Firstly, mounting and fixing a support 302 of an L-shaped rod body and a shock absorber support 506 on a connecting plate 202 of a platform fixed support 2; all hole sites are coated with lubricating oil in advance before installation, and then the guide wheel 301 is installed on the L-shaped rod body 301 through the hole 1; a spring mounting screw 501 penetrates through a hole 3 of an L-shaped rod body 301, spring seats 503 are mounted at two ends of the L-shaped rod body to the positions shown in fig. 1, springs 502 are sleeved at two ends of the L-shaped rod body, the left side of the screw 501 is fixedly mounted in a hole of a support connected with the spring seats, a spring seat 503 is mounted on the right side of the screw 501, the two springs are connected with the spring seats at two sides of the screw, and finally the spring mounting screw is fixed by spring mounting screw fixing nuts 504. After the assembly of the support 2, the limiting bracket main body 3 and the guide wheel 4 is completed, the support and the two supports which are already installed on the connecting plate 202 are connected together through a shaft, and the assembly of the whole patent device is completed. After the above steps are completed, the whole limiting bracket device is installed on the top of the platform and fixed on the platform through the main board 201 by using five groups of bolts 204, as shown in fig. 8.
The operation is described with reference to fig. 9: after the four limiting devices are installed, the whole experiment platform is hung by a crane to perform lifting translation operation, before the lifting operation is performed, the guide wheels 301 of the four limiting brackets are ensured to be completely guided into the rail, and the four guide wheels 301 are positioned at the same height, namely, the experiment platform surface is kept horizontal, the distances from the left side and the right side of the platform to the corresponding guide rails are kept the same, the springs far away from one side of the connecting plate 202 are compressed by a certain amount, the springs close to one side of the connecting plate 202 are stretched by a certain length, and part of elastic force is decomposed into pressure perpendicular to the guide rails, so that the guide wheels 301 are prevented from being easily derailed. Next, the lifting operation is performed, and during the operation, the limiting bracket device is not provided with a buffer in the front-back direction and is in rigid contact, so that the shaking in the front-back direction is reduced as much as possible, and the guide wheel 301 or the bracket 201 is prevented from being damaged due to overlarge stress. When the whole experiment platform swings leftwards by taking the lifting hook as a circle center, the guide wheels 301 of the two left limiting brackets 1 roll upwards, and the right elastic force resultant force of the two springs 502 of the left line limiting bracket 1 is increased; the guide wheels 301 of the two limiting brackets on the right roll downwards, and the resultant force of the leftward elasticity of the spring 502 is reduced. Therefore, the whole platform equipment generates a rightward spring total resultant force, the resultant force is increased along with the increase of the leftward deviation angle of the platform device until the platform stops swinging leftward, and the resultant force gradually returns to the original position under the influence of gravity and the spring total force of the limiting brackets at the two sides.
As shown in fig. 9, the four guide rails extend from the water surface to the water surface, and particularly when the platform experiment device is immersed in the water or leaves the water surface, the platform experiment device can greatly shake under the action of the water, so that the device has an obvious function, and the experiment platform can stably and accurately reach a target position.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. The utility model provides a platform operating system's spacing support device under water which characterized in that: the device comprises a platform fixing support, a limiting bracket and a spring damping component; the platform fixing support is composed of a connecting plate, a main plate and two pull plates, and the main plate and the two pull plates are vertically arranged on the top surface of the connecting plate; the main board is a square board; the pull plates are right-angle trapezoidal plates, and the right-angle edges of the two pull plates are respectively arranged on the left side and the right side of the back surface of the main plate; the front surface of the main board is provided with an L-shaped rod body support and a shock absorber support, and the shock absorber support is arranged below the L-shaped rod body support; the limiting bracket comprises an L-shaped rod body; the L-shaped rod body consists of a first rod body and a second rod body, the tail end of the first rod body is connected with the tail end of the second rod body to form an L shape, a support shaft mounting hole is formed in the joint of the first rod body and the second rod body, and the joint of the first rod body and the second rod body is mounted on an L-shaped rod body support on the front face of the mainboard through a support shaft; the first rod body is arranged above the second rod body, a guide wheel is arranged at the head end of the first rod body, and the guide wheel is arranged at the head end of the first rod body through a guide wheel shaft; the head end of the second rod body is provided with a supporting plate, and the bottom of the supporting plate is provided with a through hole; the spring vibration reduction assembly comprises a support connecting spring seat, a first spring seat, a second spring seat, a third spring seat and a screw rod; the support connecting spring seat is arranged on the shock absorber support on the front surface of the main board through a spring seat support shaft; the first spring seat is fixed on one side of the supporting plate at the head end of the second rod body and is positioned between the supporting plate and the support connecting spring seat, and the second spring seat is fixed on the other side of the supporting plate; the third spring seat is arranged in front of the second spring seat, one end of the third spring seat is provided with a screw fixing nut, and the other end of the third spring seat is connected with the second spring seat through a spring; the first spring seat is connected with the support connecting spring seat through a spring; one end of the screw is connected with the screw fixing nut, and the other end of the screw sequentially penetrates through the second spring seat, the through hole in the bottom of the supporting plate and the first spring seat and is connected with the support connecting spring seat.
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| CN202011277026.2A CN112408279B (en) | 2020-11-16 | 2020-11-16 | Spacing support device of platform operating system under water |
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| CN202011277026.2A CN112408279B (en) | 2020-11-16 | 2020-11-16 | Spacing support device of platform operating system under water |
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| CN113123655A (en) * | 2021-04-29 | 2021-07-16 | 江苏科技大学 | Anti-tilting stabilizing device of three-dimensional parking garage |
| CN115013474A (en) * | 2022-08-08 | 2022-09-06 | 常州市中昊轨道交通科技发展有限公司 | Long-life buffering and damping piece for motor train unit and machining method thereof |
| CN116129719A (en) * | 2023-01-09 | 2023-05-16 | 中国科学院国家空间科学中心 | System and method for performing microgravity capillary experiment by using facility with height drop |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113123655A (en) * | 2021-04-29 | 2021-07-16 | 江苏科技大学 | Anti-tilting stabilizing device of three-dimensional parking garage |
| CN115013474A (en) * | 2022-08-08 | 2022-09-06 | 常州市中昊轨道交通科技发展有限公司 | Long-life buffering and damping piece for motor train unit and machining method thereof |
| CN115013474B (en) * | 2022-08-08 | 2022-11-04 | 常州市中昊轨道交通科技发展有限公司 | Long-life buffering and damping piece for motor train unit and machining method thereof |
| CN116129719A (en) * | 2023-01-09 | 2023-05-16 | 中国科学院国家空间科学中心 | System and method for performing microgravity capillary experiment by using facility with height drop |
| CN116129719B (en) * | 2023-01-09 | 2024-01-26 | 中国科学院国家空间科学中心 | System and method for performing microgravity capillary experiment by using facility with height drop |
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