CN111624121A - Falling ball type resilience modulus tester - Google Patents
Falling ball type resilience modulus tester Download PDFInfo
- Publication number
- CN111624121A CN111624121A CN202010334501.9A CN202010334501A CN111624121A CN 111624121 A CN111624121 A CN 111624121A CN 202010334501 A CN202010334501 A CN 202010334501A CN 111624121 A CN111624121 A CN 111624121A
- Authority
- CN
- China
- Prior art keywords
- electromagnet
- stepping motor
- falling ball
- linear stepping
- falling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/48—Investigating hardness or rebound hardness by performing impressions under impulsive load by indentors, e.g. falling ball
-
- 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
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0083—Rebound strike or reflected energy
Landscapes
- 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)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A falling ball type resilience modulus tester takes a portal frame as a support body, a linear stepping motor is installed in the central position of a transverse bar of the portal frame, a driver is connected with the linear stepping motor and installed on the transverse bar, and a programmable logic controller is installed on a support piece on one side of the portal frame and connected with the driver, a first electromagnet and a second electromagnet. The first electromagnet is connected to the lower end of the linear stepping motor arm through a flexible connecting rope, the second electromagnet is fixed to the upper end of a flange handle of the falling ball type resilience modulus tester, and the acceleration sensor is installed at the connecting position of the flange handle and the spherical crown body; the time difference measurer is arranged at the bottom of the spherical crown body. The structure is simple and easy to install, and the cost of applying the structure to work is low; the mechanical automatic measurement is realized, the measurement precision is higher, and the working efficiency is improved.
Description
Technical Field
The invention belongs to the road surface construction process.
Background
The modulus of resilience refers to the ratio of the stress generated by the roadbed, the pavement and the road building material under the action of load to the corresponding resilience strain. The modulus of resilience is adopted as an index of the compressive strength of the soil foundation in the pavement design.
The soil foundation state is an important factor influencing the performance of the pavement, the resilience modulus is one of sensitive parameters for judging the soil foundation state and is a direct factor influencing the thickness of the pavement structure, when the resilience modulus is too large, the thickness of the pavement structure is smaller, and when the resilience modulus is too small, the thickness is larger. In addition, the bending and sinking of the top surface of the soil foundation, the compressive strain and the internal stress state of the top surface of the soil foundation and the like are closely related to the resilience modulus of the soil foundation, so that the reasonable evaluation and selection of the resilience modulus of the soil foundation are very important.
In the actual construction process, when meeting some special problems of road bed road surface, in order to reduce rework, reduce cost and shorten construction period under the prerequisite of guaranteeing construction quality, can measure the road surface modulus of resilience. For example, when a roadbed is subjected to inspection, both the compactness and the deflection value are required, but sometimes the compactness is met but the deflection is not met, if rework is adopted, great waste is caused and the construction period is delayed, the rebound modulus value is tested, and a reasonable scheme is adopted according to the test result.
With the rapid development of high-speed railways and highways in recent years, the quality requirements of the industry on road construction projects are increasingly strict, and the requirements on field tests, construction process control and the like are increasingly wide. Compared with the quality detection methods which are complex in operation, time-consuming and labor-consuming, such as a bearing plate method, a deflection method, a drop hammer deflection instrument method and a sand excavation and sand filling method, the falling ball type resilience modulus tester is distinguished by the advantages that the falling ball type resilience modulus tester is simple and convenient to operate and can quickly and accurately test the deformation characteristic of a material, and based on the Hertz impact theory, the falling ball type resilience modulus tester can be used for large-area and full-section soil foundation construction quality supervision, effectively eradicates abnormal behaviors such as labor stealing, material reduction and the like, ensures construction quality, has great social benefits and economic benefits, has very important significance for guaranteeing the construction quality of major engineering, and more falling ball type resilience modulus testers are also put into the market for use.
In order to ensure the engineering quality and standardize the market environment, the measurement of the resilience modulus of the soil-based material becomes an essential procedure in the engineering quality supervision process. The measuring method of the prior falling ball type rebound modulus tester in China comprises the following steps: the total mass of the spherical crown body and the flange handle, the Poisson ratio of the soil-based material and the falling height are input into software, and the resilience modulus of the soil-based material is directly calculated by the software, so that the relative indication error of the instrument is determined. However, in the actual operation process of measurement, the lifting position of the falling ball is completely controlled manually, so that the accuracy of the falling height, the vertical angle of the free falling body and the consistency of multiple operations cannot be guaranteed, the accuracy of the test result is influenced, and the working efficiency is greatly reduced to a certain extent. On the other hand, in actual field detection, sometimes the rebound modulus of roadbed layers with different depths needs to be tested to further evaluate the construction quality, and the existing test method can only test the rebound modulus of the roadbed with the single layer at the outermost layer. To these problems, this patent has designed a ball formula resilience modulus tester, and the core function is mechanized automatic lifting ball height, has both guaranteed the accuracy of lifting height at every turn, and the uniformity of many times operation can guarantee again that the ball falls perpendicularly, does not have the inclination.
The prior measurement of the falling ball type rebound modulus tester has the following defects:
1) the lifting height of the falling ball body is not accurate. Because the manual operation error is great, can not guarantee that can all to the falling ball body lifting to the height of regulation at every turn.
2) The consistency of multiple measurements is not controllable. Under the influence of human factors, the lifting height and the contact position of the falling ball body with the soil-based material after free falling all the time cannot be ensured to be completely consistent.
3) The flange handle can not be ensured to have no inclination angle along the vertical direction when the falling ball body falls freely. The falling ball body is lifted manually, so that the falling ball body falls at a non-zero inclination angle easily, the numerical value of a sensor in the falling ball body deviates to some extent, and the accuracy of a measuring result is influenced.
4) The measurement error is large. Because the rebound time is short, the relative error is large, and the measurement error is increased to a certain extent by replacing the rebound time with the collision time, which is not beneficial to the detection and improvement of the soil foundation construction engineering quality.
5) The labor is large. In each test, measurement personnel needs to perform repeated operation for many times, and manpower and material resources are occupied.
6) The measuring personnel directly contact with the falling ball, and the danger such as injury may exist in the measuring process.
Disclosure of Invention
A falling ball type rebound modulus tester mainly comprises a Programmable Logic Controller (PLC), a time difference measurer TDC-GP2, a driver, a linear stepping motor, an electromagnet, a portal frame and the like, wherein a hardware connection diagram is shown in figure 1.
In fig. 1, 1 is a portal frame, 2 is a Programmable Logic Controller (PLC), 3 is a driver, 4 is a linear stepping motor, 5 is a linear stepping motor arm, 6 is a flexible connecting rope, 7 is a circuit connecting wire, 8 is a first electromagnet, 9 is a second electromagnet, 10 is a falling ball type rebound modulus tester host, 11 is a flange handle, 12 is an acceleration sensor, 13 is a spherical crown body, 14 is a time difference measurer TDC-GP2, and 15 is a soil matrix material to be tested.
As shown in figure 1, the falling ball type rebound modulus tester takes a portal frame as a support body, a linear stepping motor 4 is arranged at the central position of a rail of the portal frame 1, a driver 3 is connected with the linear stepping motor and arranged on the rail, and a programmable logic controller 2 is arranged on the support body at one side of the portal frame and connected with the driver 3, a first electromagnet 8 and a second electromagnet 9. The first electromagnet 8 is connected to the lower end of the linear stepping motor arm through a flexible connecting rope, the second electromagnet 9 is fixed to the upper end of a flange handle 11 of the falling ball type rebound modulus tester, and an acceleration sensor 12 is installed at the connecting position of the flange handle and the spherical crown body; the time difference measurer 14 is arranged at the bottom of the spherical crown body 13 and can measure picosecond time.
15 is a soil-based material, which can be considered as infinite if it is in a real road, and is a circular test block with a diameter and thickness of not less than 300mm if it is subjected to a relevant calibration test.
The portal frame is mainly used for combining the whole set of device and providing a supporting effect for the core device, and the portal frame is selected as a supporting body, so that the test error caused by deflection of the single-arm lifting device can be avoided. The universal wheel is equipped with to the portal frame bottom, and the transport of being convenient for, calibration place selection is more nimble, when not needing to remove the portal frame position, and the lockable universal wheel prevents that the device from taking place the displacement among the experimentation.
The programmable logic controller is arranged on the side edge of the portal frame and connected with the input end of the driver, and is a main object operated by a worker in the whole device, and a measurer realizes the automatic operation of the whole calibration test by inputting instructions in the editable logic controller, wherein the automatic operation comprises the lifting height of a falling ball body, a linear stepping motor driver starting signal, an electromagnet on-off switch signal and an emergency stop signal in the preset test process
The output end of the driver is connected with the linear stepping motor, and the command sent by the editable logic controller is converted into pulse to drive the arm of the linear stepping motor to do linear motion in the vertical direction.
The linear stepping motor converts the pulse signal output by the driver into the linear motion of the motor arm, and the lifting height of the device is directly influenced.
The first electromagnet is connected with the lower end of the linear stepping motor arm through a flexible connecting rope, the second electromagnet is installed at the upper end of the flange handle, and the two electromagnets are controlled by a programmable logic controller together. When the control circuit is connected, the two electromagnets are adsorbed together and pulled by the linear stepping motor, so that the function of lifting the height of the falling ball type rebound modulus tester is realized. When the control circuit is disconnected, the electromagnet is instantly separated, the falling ball type rebound modulus tester is released, and then free falling can be realized. The soft connecting rope can ensure that the falling ball type resilience modulus tester is always in a natural drooping state in the lifting and releasing processes, and the flange handle and the spherical crown body can fall at no inclination angle in the vertical direction.
Effects of the invention
1, the accuracy of the lifting height of the falling ball body is improved. The lifting and falling processes of the falling ball body are controlled mechanically, so that the height and the position can be controlled accurately, and the measurement error caused by the inaccuracy of the lifting height is eliminated.
2, the operation process is controllable, the machine can be operated according to a set program, and the heights and positions of the lifted and fallen spheres are ensured to be consistent each time.
3, the problem of the inclination angle of the falling ball body during free falling is solved, the measurement error caused by the angle problem is greatly reduced, and the measurement accuracy is improved.
4 can realize the precision measurement of resilience time, eliminate the measuring error who causes by resilience time error for measuring result is more accurate, and then improves the measurement of soil matrix resilience modulus, finally realizes the improvement of soil matrix construction quality.
5 the manpower is liberated to a certain extent, and the measuring personnel do not need to carry out repeated operation for many times.
6, the safety is improved.
Drawings
FIG. 1 is a schematic diagram of hardware connection of a falling ball type rebound modulus tester
FIG. 2 is a flow chart of a technical scheme of a falling ball type rebound modulus tester
Detailed Description
The falling ball type rebound modulus tester consists of a flange handle, a spherical crown body, a host, a time difference measurer TDC-GP2 and an acceleration sensor, wherein the upper end of the flange handle is connected with the host, the lower end of the flange handle is connected with the spherical crown body, and the acceleration sensor and the time difference measurer TDC-GP2 are arranged at the joint of the lower ends of the flange handle. When the spherical crown body freely falls and contacts with the soil-based material, the mechanical response parameters of impact collision are transmitted back to a host connected with the flange handle through an acceleration sensor, when the falling spherical body contacts with the soil-based material, the time difference measurer TDC-GP2 starts to send out a pulse signal, the rebound process is finished, when the falling spherical body returns to the position of initial contact with the soil-based material, the time difference measurer TDC-GP2 stops measuring and transmits the time difference of the rebound process back to the host, and the rebound modulus of the soil-based material is obtained through calculation after the host analyzes the time difference.
The technical scheme flow of the falling ball type rebound modulus tester is shown in figure 2.
The main functions of the PLC in the device are: the device comprises a linear stepping motor motion control module, an electromagnet switch control module, a self-calibration motion module and a data setting module. In the self-calibration mode, when the linear stepping motor arm descends to the point that the bottom surface of the first electromagnet is in close contact with the top surface of the second electromagnet, the position parameter at the moment is calibrated to be zero. When the falling ball type resilience modulus tester is lifted to a set height, the electromagnet is controlled to be powered off, the free falling body of the tester is released, and the linear stepping motor arm is controlled to automatically perform lifting and resetting motions when repeated tests are performed.
This patent a ball formula resilience modulus tester overall technical scheme implementation process is as follows:
(1) putting the falling ball type resilience modulus tester and the soil matrix material as shown in figure 1, and switching on a power supply to start the PLC and the host;
(2) presetting the lifting height required by the test in a PLC, and inputting the total mass of a spherical crown body and a flange handle, the Poisson ratio of a soil-based material and the falling height in a falling ball type rebound modulus tester host;
(3) lowering the linear stepping motor arm until the bottom surface of the first electromagnet is in close contact with the top surface of the second electromagnet, and setting the initial indication value of the PLC to be zero;
(4) starting the test, electrifying the electromagnet for adsorption;
(5) after the linear stepping motor arm is lifted to a set height (if the set lifting height is too low, the movement time of the falling ball body is extremely short in the measuring process, the error of the measuring result is larger, and if the set lifting height is too high, the falling ball body can damage the soil-based material to a certain extent and has potential safety hazards.
(6) Recording test data in a host of the falling ball type resilience modulus tester;
(7) repeating the measurement 10 times or more (for obtaining an average value) according to the above steps (3) to (7);
(8) and stopping the test and collecting measurement data.
The falling ball type resilience modulus tester has the advantages of simple structure, easiness in installation and low cost when applied to work;
the measurement process is controllable, the measurement precision is high, and uncertainty factors of manual operation are eliminated through instrument control, so that the measurement precision can reach +/-2%;
this patent has realized the automatic measurement of falling ball formula resilience modulus tester for measurement is easy to operate more, has greatly liberated the manpower, has improved work efficiency.
Claims (2)
1. The utility model provides a falling ball formula resilience modulus tester which characterized in that: the gantry is used as a support body, the linear stepping motor is arranged in the center of a transverse bar of the gantry, the driver and the linear stepping motor are connected and arranged on the transverse bar, and the programmable logic controller is arranged on a support piece on one side of the gantry and connected with the driver, the first electromagnet and the second electromagnet; the first electromagnet is connected to the lower end of the linear stepping motor arm through a flexible connecting rope, the second electromagnet is fixed to the upper end of a flange handle of the falling ball type resilience modulus tester, and the acceleration sensor is installed at the connecting position of the flange handle and the spherical crown body; the time difference measurer is arranged at the bottom of the spherical crown body.
2. A method of using a falling ball rebound modulus tester as claimed in claim 1 wherein:
the output end of the driver is connected with the linear stepping motor, and the command sent by the editable logic controller is converted into a pulse to drive the arm of the linear stepping motor to do linear motion in the vertical direction;
the first electromagnet is connected with the lower end of the linear stepping motor arm through a flexible connecting rope, the second electromagnet is arranged at the upper end of the flange handle, and the two electromagnets are controlled by a programmable logic controller together to form a circuit; when the control circuit is connected, the two electromagnets are adsorbed together and pulled by the linear stepping motor, so that the function of lifting the height of the falling ball type resilience modulus tester is realized; when the control circuit is disconnected, the electromagnet is instantly separated, the falling ball type rebound modulus tester is released, and free falling is realized; the upper end of the flange handle is connected with the host, the lower end of the flange handle is connected with the spherical crown body, and an acceleration sensor and a time difference measurer are arranged at the joint of the lower ends of the flange handle and the spherical crown body; when the spherical crown body freely falls and contacts with the soil-based material, the mechanical response parameters of impact collision are transmitted back to a host connected with the flange handle through an acceleration sensor, when the falling spherical body contacts with the soil-based material, the time difference measurer starts to send out a pulse signal, the rebound process is finished, when the falling spherical body returns to the position initially contacting with the soil-based material, the time difference measurer stops measuring and transmits the time difference of the rebound process back to the host, and the rebound modulus of the soil-based material is obtained through calculation after the host analyzes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010334501.9A CN111624121A (en) | 2020-04-24 | 2020-04-24 | Falling ball type resilience modulus tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010334501.9A CN111624121A (en) | 2020-04-24 | 2020-04-24 | Falling ball type resilience modulus tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111624121A true CN111624121A (en) | 2020-09-04 |
Family
ID=72257913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010334501.9A Pending CN111624121A (en) | 2020-04-24 | 2020-04-24 | Falling ball type resilience modulus tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111624121A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188927A (en) * | 2021-03-25 | 2021-07-30 | 河海大学 | Impact power model test device and test method for buried pressure pipeline |
| CN115855712A (en) * | 2023-03-03 | 2023-03-28 | 北京阿玛西换热设备制造有限公司 | Rubber resilience measuring instrument |
-
2020
- 2020-04-24 CN CN202010334501.9A patent/CN111624121A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188927A (en) * | 2021-03-25 | 2021-07-30 | 河海大学 | Impact power model test device and test method for buried pressure pipeline |
| CN113188927B (en) * | 2021-03-25 | 2022-07-29 | 河海大学 | Buried pressure pipeline impact power model test device and test method |
| CN115855712A (en) * | 2023-03-03 | 2023-03-28 | 北京阿玛西换热设备制造有限公司 | Rubber resilience measuring instrument |
| CN115855712B (en) * | 2023-03-03 | 2023-04-21 | 北京阿玛西换热设备制造有限公司 | Rubber rebound resilience measuring instrument |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9588029B2 (en) | Dynamics performance testing system | |
| WO2018006585A1 (en) | Multi-functional true triaxial rock drilling test system and method | |
| CN111624121A (en) | Falling ball type resilience modulus tester | |
| CN104515490B (en) | A kind of convertible online external diameter self-operated measuring unit | |
| CN109975129B (en) | Movable frame, simulation test system and simulation method thereof | |
| CN109708983A (en) | A kind of fatigue test system and method for traffic loading application | |
| CN210269097U (en) | Drop hammer impact testing machine for track system | |
| CN107870135A (en) | The cable life test device and method of testing of a kind of variable element | |
| CN112878398A (en) | Pile pipe hammering test equipment and test method | |
| CN109060563B (en) | Device and method for testing penetration resistance of helmet | |
| CN212031201U (en) | Device for accurately measuring resilience modulus of geotechnical material | |
| KR101254995B1 (en) | Percussive Apparatus, Remolding Index Testing System of a object having the same, and Remolding Index Testing method of a object | |
| CN208187873U (en) | A kind of concrete and soil body interface shearing experimental rig | |
| CN204924607U (en) | Test device is markd to dummy's pleural region | |
| CN210946767U (en) | Electric dynamic sounding device | |
| CN209513456U (en) | A kind of sxemiquantitative unconfined compressive strength tester | |
| CN113404095B (en) | Detection equipment and detection method for high strain of foundation pile | |
| CN214010946U (en) | Height drop hammer testing device for ball rod | |
| CN103983524B (en) | A kind of method utilizing calibrated wrench method test device to realize concrete crushing strength detection | |
| CN206893187U (en) | A kind of lifting machinery metal structure stress-strain test apparatus for demonstrating | |
| CN214784251U (en) | Pile pipe hammering test equipment | |
| CN109490092A (en) | A kind of sxemiquantitative unconfined compressive strength tester | |
| CN201149542Y (en) | Test device for gasoline saw chain brake | |
| CN206430997U (en) | Plastic strength test device and system are supported at the beginning of autoclave aerated concrete building block base substrate | |
| CN115876616B (en) | Test device for testing mechanical behavior of repaired road through friction force and positive pressure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |