CN115876616B - Test device for testing mechanical behavior of repaired road through friction force and positive pressure - Google Patents
Test device for testing mechanical behavior of repaired road through friction force and positive pressure Download PDFInfo
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- CN115876616B CN115876616B CN202310196609.XA CN202310196609A CN115876616B CN 115876616 B CN115876616 B CN 115876616B CN 202310196609 A CN202310196609 A CN 202310196609A CN 115876616 B CN115876616 B CN 115876616B
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Abstract
The invention belongs to the technical field of test road repair performance test devices, and particularly relates to a test device for testing mechanical behaviors of a repaired road through friction force and positive pressure. The invention combines the friction force and the positive pressure to test the mechanical behavior of the repaired road, other test devices only consider the friction force or the positive pressure factor singly, the friction force or the positive pressure factor is not combined to study, the obtained test result has obvious difference from the actual road, the invention is used for testing the repaired road, the invention is more practical, and the test result is more accurate. Can provide help for the research in the technical field of road repair and help for the exploration of urban road safety performance, and has very practical significance.
Description
Technical Field
The invention belongs to the technical field of test devices for testing road repair performance, and particularly relates to a test device for testing mechanical behavior of a repaired road through friction force and positive pressure.
Background
In recent years, with the rapid increase of the number of roads in China, the number of level grades of the roads is multiplied compared with the number of roads in the past, and various novel materials are developed to repair damaged roads in the face of maintenance of such huge roads, and the adhesion between the original road surface and the repair materials and the pressure resistance of the road surface after repair bring importance to people. Related researches show that the damage of the sudden braking of the automobile to the road is a main factor in the factor of the road surface re-damage after repair, and the damage of the sudden braking to the road is caused by the huge friction force caused by the sudden braking and the damage of the positive pressure caused by the weight of the automobile. Whereas the prior patent, application number: CN201811626310.9 is a device and a method for testing impact resistance of road materials, which can set various different road working conditions such as strong acid, strong alkali, rainfall, high temperature, ultraviolet aging, etc., simulate complex environment, and rapidly and accurately obtain the impact resistance of the road materials under different impact parameters.
In addition, the technology for testing the road at the present stage has a falling ball method, namely, the steel ball is freely fallen onto a test piece to be tested, and the performance of the road is measured by observing the damage degree of the test piece; the pendulum bob device for testing the friction coefficient of the road surface is designed on the bottom surface of the pendulum bob, then the pendulum bob is lifted to a certain height and is lowered, the sliding block made of rubber is in contact with the road surface, and the greater the friction force is, the lower the height of the pendulum bob which is lifted again is. The common characteristic of the prior art is that the influence of friction force or instant impact force on the road is considered singly, and the friction force and positive pressure of the automobile running on the road surface in actual conditions are not combined to test the performance of the road.
Disclosure of Invention
In order to solve the problems, the invention discloses a test device for testing mechanical behavior after road repair by friction force and positive pressure, which can provide help for the research in the technical field of road repair and provide help for the exploration of urban road safety performance, and has very practical significance.
The invention adopts the following technical scheme to achieve the aim:
the utility model provides a test device through frictional force and positive pressure test road mechanical behavior after repairing, includes the support, install fixed establishment, load mechanism, force application mechanism, ball mechanism and elevating gear fall on the support, wherein:
the fixing mechanism is used for fixing a lower material layer of a road behind a repairing road and comprises a test platform and three tightening units, the test platform is arranged above the support, a rectangular opening die is arranged in the middle of the upper part of the test platform, the rectangular opening die is filled with the lower material layer, an upper material layer is paved on the lower material layer, the three tightening units are respectively arranged on three sides of the test platform, each tightening unit comprises a positioning steel sheet, a rotary handle and a nut, the positioning steel sheet is welded on the test platform and is close to the rectangular opening die, the nuts are welded on the test platform and are arranged opposite to the positioning steel sheets, the rotary handles are in threaded connection with the nuts, and the rotary handles can position the steel sheets to be abutted by rotating the ends of the rotary handles;
the load mechanism comprises a rigid support, a movable platform and two electric hydraulic jacks, wherein the rigid support is arranged above the test platform, a chute is formed in the rigid support, the movable platform is arranged on the chute, and the two electric hydraulic jacks are inversely welded on the lower end face of the movable platform;
the force application mechanism is a rectangular steel bar frame, the rectangular steel bar frame is pre-buried in the upper material layer, the connecting edge of the rectangular steel bar frame is positioned at the outer side of the upper material layer, and a circular iron ring is welded on the connecting edge; the connecting edge is positioned at one side far away from the tightening unit;
the ball falling mechanism comprises a fixed pulley, a steel rope, a buffer unit and an iron ball, wherein the fixed pulley is arranged on the test platform and is close to one side of the circular iron ring, one end of the steel rope is connected with the circular iron ring, and the other end of the steel rope bypasses the fixed pulley to be sequentially connected with the buffer unit and the iron ball;
the lifting device comprises an electric lifting frame, an electromagnet platform and a laser ranging sensor, wherein the electric lifting frame is installed on the test platform and is close to one side of the circular iron ring, and the electromagnet platform is installed on the electric lifting frame.
Preferably, a wheel is mounted at the bottom of each electric hydraulic jack, and the wheels are made of rubber materials.
Preferably, the buffer unit comprises a cylindrical shell, an upper connecting hook, a pressure limiting steel plate, a piston rod and a lower connecting hook, wherein the cylindrical shell comprises an upper shell and a lower shell which are in threaded connection, the upper connecting hook is fixed on the outer side of the upper end face of the upper shell, the upper connecting hook is connected with the steel cable, the upper end of the pressure limiting steel plate is connected with the inner side of the upper end face of the upper shell, the piston is arranged on the inner side of the lower shell, the lower end of the pressure limiting steel plate is connected with the upper end face of the piston, the lower end face of the piston is connected with the upper end face of the piston rod, the lower end of the piston rod penetrates through the outer side of the lower end face of the lower shell and is connected with the lower connecting hook, and the lower connecting hook is connected with the iron ball.
Preferably, a buffer layer is filled under the piston inside the lower case.
Preferably, the buffer layer is made of foamed ceramic material.
Preferably, the device further comprises an observation mechanism, wherein the observation mechanism comprises a camera frame and a high-speed camera, the camera frame is arranged on one side of the test platform, and the high-speed camera is arranged on the camera frame.
Preferably, the device further comprises a controller, the controller is respectively connected with the electric hydraulic jack, the electric lifting frame and the laser ranging sensor, the laser ranging sensor measures the height between the electromagnet platform and the ground, the height value is input to the controller, and the controller adjusts the height of the electromagnet platform according to the height value.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the prior art, other test devices only consider friction force or positive pressure factors singly and do not combine the friction force or the positive pressure factors to study, the obtained test result has obvious difference from the actual road, and the method is used for testing the repaired road, so that the method is more practical and the test result is more accurate;
2. the invention designs a secondary recovery device, and solves the problem of carrying out secondary repeated tests by lifting the iron ball with larger weight again after the first test is finished;
3. according to the invention, the actual situation is considered, the bottom of the electric hydraulic jack is provided with a row of wheels made of rubber, so that damage to the jack caused by relative movement of two materials is effectively prevented, and the same positive pressure is provided for the whole test process, so that the test result is more accurate;
4. the invention adds a laser ranging module aiming at the control of the electromagnet lifting platform, can adjust the value of the instantaneous tension on the steel cable by adjusting the release height of the iron ball, and can also test the limit of the adhesiveness of two materials by adjusting different release heights through multiple tests. The test is added with a control test, and the accuracy and the scientificity of the test are improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic structural view of the load mechanism of the present invention;
FIG. 3 is a schematic view of a no-load mechanism of the present invention;
FIG. 4 is a schematic diagram of the connection between the force applying mechanism and the steel cable;
FIG. 5 is a schematic diagram of the connection of steel balls and steel ropes according to the present invention;
FIG. 6 is a cross-sectional view of a cushioning unit of the present invention;
FIG. 7 is a diagram showing a connection mode between a pressure limiting steel plate and a buffer unit according to the present invention;
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
In order to better understand the embodiments of the present application, the following description will clearly and completely describe the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
As shown in fig. 1 to 7, the test device for testing mechanical behavior after road repair by friction force and positive pressure comprises a bracket, wherein a fixing mechanism 1, a load mechanism 2, a force application mechanism 3, a ball falling mechanism 4 and a lifting device 5 are arranged on the bracket, and the test device comprises:
the fixing mechanism 1 is used for fixing a lower material layer 6 of a road behind a repairing road, and comprises a test platform 11 and three tightening units 12, wherein the test platform 11 is arranged above the support, a rectangular opening die is arranged in the middle of the upper part of the test platform 11, the rectangular opening die is filled with the lower material layer 6, an upper material layer 7 is paved on the lower material layer 6, the three tightening units 12 are respectively arranged on three sides of the test platform 11, the tightening units 12 comprise a positioning steel sheet 121, a fixed rotation handle 122 and a nut 123, the positioning steel sheet 121 is welded on the test platform 11 and is close to the rectangular opening die, the nut 123 is welded on the test platform 11 and is opposite to the positioning steel sheet 121, the fixed rotation handle 122 is in threaded connection with the nut 123, and the fixed rotation handle 122 can be abutted against the positioning steel sheet 121 by rotating the end part of the fixed rotation handle 122;
the load mechanism 2 comprises a rigid support 21, a movable platform 22 and two electric hydraulic jacks 23, wherein the rigid support 21 is arranged above the test platform 11, a chute is formed in the rigid support 21, the movable platform 22 is arranged on the chute, and the two electric hydraulic jacks 23 are welded on the lower end face of the movable platform 22 in an inverted mode;
the force application mechanism 3 is a rectangular steel bar frame, the rectangular steel bar frame is pre-buried in the upper material layer 7, the connecting edge of the rectangular steel bar frame is positioned at the outer side of the upper material layer 7, and a circular iron ring 31 is welded on the connecting edge; the connecting edge is positioned at one side far away from the tightening unit 12;
the ball falling mechanism 4 comprises a fixed pulley 41, a steel cable 42, a buffer unit 43 and an iron ball 44, wherein the fixed pulley 41 is arranged on the test platform 11 and is close to one side of the circular iron ring 31, one end of the steel cable 42 is connected with the circular iron ring 31, and the other end of the steel cable bypasses the fixed pulley 41 to be sequentially connected with the buffer unit 43 and the iron ball 44;
the lifting device 5 comprises an electric lifting frame 51, an electromagnet platform 52 and a laser ranging sensor, wherein the electric lifting frame 51 is installed on the test platform 11 and is close to one side of the circular iron ring 31, and the electromagnet platform 52 is installed on the electric lifting frame 51.
A wheel 24 is mounted at the bottom of each electro-hydraulic jack 23, and the wheel 24 is made of rubber.
The buffer unit 43 includes a cylindrical housing 431, an upper connection hook 432, a pressure limiting steel plate 433, a piston 434, a piston rod 435, and a lower connection hook 436, the cylindrical housing 431 includes an upper case and a lower case which are screw-connected, the upper connection hook 432 is fixed to the outside of the upper end surface of the upper case, the upper connection hook 432 is connected to the wire rope 42, the upper end of the pressure limiting steel plate 433 is connected to the inside of the upper end surface of the upper case, the piston 434 is disposed at the inside of the lower case, the lower end of the pressure limiting steel plate 433 is connected to the upper end surface of the piston 434, the lower end surface of the piston 434 is connected to the upper end surface of the piston rod 435, the lower end of the piston rod 435 passes through the outside of the lower end surface of the lower case and is connected to the lower connection hook 436, and the lower connection hook 436 is connected to the iron ball 44.
The underside of the piston 434 inside the lower housing is filled with a cushioning layer.
The buffer layer is made of foamed ceramic materials.
The device also comprises an observation mechanism, wherein the observation mechanism comprises a camera frame and a high-speed camera, the camera frame is arranged on one side of the test platform 11, and the high-speed camera is arranged on the camera frame.
The device further comprises a controller which is respectively connected with the electric hydraulic jack 23, the electric lifting frame 51 and the laser ranging sensor, wherein the laser ranging sensor measures the height between the electromagnet platform 52 and the ground and inputs the height value to the controller, and the controller adjusts the height of the electromagnet platform 52 according to the height value.
When the test bed is used, firstly, the lower material layer 6 is injected into the rectangular opening mold on the test bed 11 until the lower material layer 6 is level with the rectangular opening mold in height, and then three clamping units 12 on the test bed 11 are used, and the tightness degree is adjusted by rotating the fixed rotary handle 122, so that the rectangular opening mold is fixed on the test bed 11. Next, the upper material layer 7 is laid and two reinforcing bars in the rectangular reinforcing bar frame are buried in the upper material layer 7.
Second, the buffer unit 43 is assembled.
Third, the wire rope 42 is connected with its end to the circular iron ring 31 of the rectangular reinforcing bar frame, and the other end of the wire rope 42 is connected with the upper connection hook 432 of the buffer unit 43, and then connected with the iron ball 44 using the buffer lower connection hook 436.
Fourth, the movable platform 22 is adjusted to move the two electro-hydraulic jacks to the central position of the upper material layer 7. The electro-hydraulic jack 23 is then fed with the required load pressure so that the jack presses down on the upper material layer 7.
Next, the electromagnet platform 52 is energized, and the iron ball 44 is attracted to the electromagnet platform 52 and raised to a desired height. Specifically, the laser ranging sensor will always measure the distance to ground and input the distance value to the controller, which will calculate the ideal tension limit that can be achieved by falling the ball according to the pre-input program, and display the distance to ground value and the tension limit value on the display screen, and the test operator will raise the electromagnet platform 52 to the desired height according to the desired tension limit value.
Finally, the test is started by pressing the power-off button of the electromagnet platform 52, the iron ball 44 moves in free falling within a few seconds, the steel cable 42 is instantaneously tensioned, when the tension on the steel cable 42 is greater than the pressure-resistant value of the pressure-limiting steel plate 433 designed on the buffer unit 43, the steel plate is instantaneously tensioned, the piston 434 starts to move within the piston 434 under the action of the gravity of the iron ball 44, and the buffer material foamed ceramic is compressed until the speed of the iron ball 44 is reduced to zero. At the same time, the high-speed camera can record the change between two tested materials.
The wheel made of rubber plays a role in: when testing, if two pavement materials are subjected to relative movement, the jacks applying positive pressure are also subjected to simultaneous movement, so that the test piece to be tested is ensured to be subjected to the same positive pressure in the whole test process. Because if wheels are not additionally arranged, firstly, when two road surface materials move relatively, the jack cannot move along with the two road surface materials, so that the test materials cannot be subjected to positive pressure to the same extent in the whole test process, the error of the test result is larger, secondly, the jack and the test materials have larger load pressure in the vertical direction, and on the basis, the tested piece moves horizontally instantaneously, so that the electro-hydraulic jack can be damaged.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, component disassembly, or combination thereof, etc. that falls within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (6)
1. The utility model provides a test device through frictional force and positive pressure test road mechanical behavior after repairing, includes the support, its characterized in that, install fixed establishment, load mechanism, force application mechanism, ball mechanism and elevating gear on the support, wherein:
the fixing mechanism is used for fixing a lower material layer of a road behind a repairing road and comprises a test platform and three tightening units, the test platform is arranged above the support, a rectangular opening die is arranged in the middle of the upper part of the test platform, the rectangular opening die is filled with the lower material layer, an upper material layer is paved on the lower material layer, the three tightening units are respectively arranged on three sides of the test platform, each tightening unit comprises a positioning steel sheet, a rotary handle and a nut, the positioning steel sheet is welded on the test platform and is close to the rectangular opening die, the nuts are welded on the test platform and are arranged opposite to the positioning steel sheets, the rotary handles are in threaded connection with the nuts, and the rotary handles can position the steel sheets to be abutted by rotating the ends of the rotary handles;
the load mechanism comprises a rigid support, a movable platform and two electric hydraulic jacks, wherein the rigid support is arranged above the test platform, a chute is formed in the rigid support, the movable platform is arranged on the chute, and the two electric hydraulic jacks are inversely welded on the lower end face of the movable platform;
the force application mechanism is a rectangular steel bar frame, the rectangular steel bar frame is pre-buried in the upper material layer, the connecting edge of the rectangular steel bar frame is positioned at the outer side of the upper material layer, and a circular iron ring is welded on the connecting edge; the connecting edge is positioned at one side far away from the tightening unit;
the ball falling mechanism comprises a fixed pulley, a steel rope, a buffer unit and an iron ball, wherein the fixed pulley is arranged on the test platform and is close to one side of the circular iron ring, one end of the steel rope is connected with the circular iron ring, and the other end of the steel rope bypasses the fixed pulley to be sequentially connected with the buffer unit and the iron ball; the buffer unit comprises a cylindrical shell, an upper connecting hook, a pressure limiting steel plate, a piston rod and a lower connecting hook, wherein the cylindrical shell comprises an upper shell and a lower shell which are in threaded connection, the upper connecting hook is fixed on the outer side of the upper end face of the upper shell, the upper connecting hook is connected with the steel cable, the upper end of the pressure limiting steel plate is connected with the inner side of the upper end face of the upper shell, the piston is arranged on the inner side of the lower shell, the lower end of the pressure limiting steel plate is connected with the upper end face of the piston, the lower end face of the piston is connected with the upper end face of the piston rod, the lower end of the piston rod penetrates through the outer side of the lower end face of the lower shell and is connected with the lower connecting hook, and the lower connecting hook is connected with the iron ball;
the lifting device comprises an electric lifting frame, an electromagnet platform and a laser ranging sensor, wherein the electric lifting frame is installed on the test platform and is close to one side of the circular iron ring, and the electromagnet platform is installed on the electric lifting frame.
2. The test device for testing mechanical behavior after road repair by friction and positive pressure according to claim 1, wherein a wheel is installed at the bottom of each electro-hydraulic jack, and the wheels are made of rubber materials.
3. The test device for testing mechanical behavior after road repair by friction and positive pressure according to claim 1, wherein a buffer layer is filled under the piston inside the lower case.
4. The test device for testing mechanical behavior after road repair by friction and positive pressure according to claim 3, wherein the buffer layer is made of foamed ceramic material.
5. The device for testing mechanical behavior after road repair by friction and positive pressure according to claim 4, further comprising an observation mechanism, wherein the observation mechanism comprises a camera frame and a high-speed camera, the camera frame is mounted on one side of the test platform, and the high-speed camera is mounted on the camera frame.
6. The test device for testing mechanical behavior after road repair by friction and positive pressure according to claim 5, further comprising a controller connected to the electro-hydraulic jack, the electric lifting frame and the laser ranging sensor, respectively, the laser ranging sensor measuring the height of the electromagnet platform from the ground and inputting the height value to the controller, the controller adjusting the height of the electromagnet platform according to the height value.
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| CN202310196609.XA CN115876616B (en) | 2023-03-03 | 2023-03-03 | Test device for testing mechanical behavior of repaired road through friction force and positive pressure |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5457984A (en) * | 1994-05-20 | 1995-10-17 | The United States Of Americas As Represented By The Administrator Of National Aeronautics And Space Administration | Internally damped, self-arresting vertical drop-weight impact test apparatus |
| JP2014222095A (en) * | 2013-05-14 | 2014-11-27 | 株式会社安藤・間 | Friction damper |
| KR20160029519A (en) * | 2014-09-05 | 2016-03-15 | 엘지전자 주식회사 | Laundry treating apparatus |
| CN108603823A (en) * | 2015-12-16 | 2018-09-28 | 迪纳泰斯特国际有限公司 | Drop hammer deflection meter |
| CN209245155U (en) * | 2018-11-01 | 2019-08-13 | 南京鑫业诚机器人科技有限公司 | A kind of novel counterweight structure |
| CN211784868U (en) * | 2019-12-30 | 2020-10-27 | 韶关市翔和公路工程质量检测有限公司 | Be used for road surface material strength testing machine |
| KR20210083781A (en) * | 2019-12-27 | 2021-07-07 | 박재호 | A pool ball for toy |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201867346U (en) * | 2010-07-23 | 2011-06-15 | 武汉理工大学 | Simulation test device for loosening and grain falling of anti-skid overlay material on road surface |
| CN202648907U (en) * | 2012-07-11 | 2013-01-02 | 广东省建筑科学研究院 | Automatic falling ball impact testing machine |
| CN203595634U (en) * | 2013-10-25 | 2014-05-14 | 长安大学 | Multifunctional asphalt pavement durability tester |
| CN104020003B (en) * | 2014-06-12 | 2016-09-07 | 浙江工业大学 | A kind of falling ball impact test machine of the optimum collision energy testing material |
| CN204127017U (en) * | 2014-09-15 | 2015-01-28 | 常州力安液压设备有限公司 | Pressure limiting hydraulic jack |
| CN204154625U (en) * | 2014-09-28 | 2015-02-11 | 中材（天津）粉体技术装备有限公司 | A kind of device measuring granule materials coefficient of interal friction |
| CN105136587B (en) * | 2015-09-01 | 2018-04-20 | 武汉路源工程质量检测有限公司 | A kind of asphalt mixture in track test device |
| CN107622718A (en) * | 2016-07-13 | 2018-01-23 | 张芝媛 | Friction force demonstration device for teaching experiment |
| CN208563663U (en) * | 2018-06-22 | 2019-03-01 | 刘雷 | A kind of steel building assembled light wall |
| CN109473902A (en) * | 2018-07-02 | 2019-03-15 | 金华送变电工程有限公司三为电力分公司 | A kind of high altitude operation prevents tool drop device |
| CN208501452U (en) * | 2018-07-06 | 2019-02-15 | 河北工业大学 | A kind of device of tilting semi-rigid asphalt pavement inter-layer shearing strength test |
| CN109612862B (en) * | 2018-12-10 | 2022-05-10 | 福建博海工程技术有限公司 | Experimental device and method for simulating influence of tire brake sliding friction on road surface abrasion |
| CN209732122U (en) * | 2019-03-28 | 2019-12-06 | 西北农林科技大学 | Warmhouse booth assembled film pressing device |
| CN211383546U (en) * | 2019-12-17 | 2020-09-01 | 武汉乐道物流有限公司 | Rotatable torque-reducing type buffering safety rope |
| CN212794127U (en) * | 2020-07-15 | 2021-03-26 | 长沙瑞捷机械科技股份有限公司 | Frame turning device for vehicle production |
| CN212773410U (en) * | 2020-07-23 | 2021-03-23 | 中国建筑第二工程局有限公司 | Steel bar scaffold wall connecting piece structure |
| CN213475151U (en) * | 2020-10-09 | 2021-06-18 | 湖北清瑞和环保科技有限公司 | Crushed concrete heavy object lifting device |
| CN214284733U (en) * | 2020-10-29 | 2021-09-28 | 科沃斯机器人股份有限公司 | Self-moving device, safety rope and safety rope reliability detection device |
| CN215166592U (en) * | 2020-12-15 | 2021-12-14 | 长春工程学院 | Horizontal support for building construction embedded component |
| CN113062936B (en) * | 2021-03-30 | 2023-02-28 | 西北工业大学 | Safety rope brake based on shear thickening fluid and braking method |
| CN215262779U (en) * | 2021-05-31 | 2021-12-21 | 江苏库纳实业有限公司 | Falling ball testing device |
-
2023
- 2023-03-03 CN CN202310196609.XA patent/CN115876616B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5457984A (en) * | 1994-05-20 | 1995-10-17 | The United States Of Americas As Represented By The Administrator Of National Aeronautics And Space Administration | Internally damped, self-arresting vertical drop-weight impact test apparatus |
| JP2014222095A (en) * | 2013-05-14 | 2014-11-27 | 株式会社安藤・間 | Friction damper |
| KR20160029519A (en) * | 2014-09-05 | 2016-03-15 | 엘지전자 주식회사 | Laundry treating apparatus |
| CN108603823A (en) * | 2015-12-16 | 2018-09-28 | 迪纳泰斯特国际有限公司 | Drop hammer deflection meter |
| CN209245155U (en) * | 2018-11-01 | 2019-08-13 | 南京鑫业诚机器人科技有限公司 | A kind of novel counterweight structure |
| KR20210083781A (en) * | 2019-12-27 | 2021-07-07 | 박재호 | A pool ball for toy |
| CN211784868U (en) * | 2019-12-30 | 2020-10-27 | 韶关市翔和公路工程质量检测有限公司 | Be used for road surface material strength testing machine |
Non-Patent Citations (3)
| Title |
|---|
| 塔式抽油机失载刹车装置;殷刚 等;装备制造技术(第07期);176-177 * |
| 潮湿状态下陶瓷地砖摩擦系数测试方法探讨;何问慎 等;佛山陶瓷(第06期);71-74 * |
| 透水路面路基性能的实验研究;张巨松 等;沈阳建筑大学学报(自然科学版)(第06期);87-90 * |
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