CN106940275B - Plate clamp platform for drop hammer impact test and impact speed measuring method - Google Patents
Plate clamp platform for drop hammer impact test and impact speed measuring method Download PDFInfo
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- CN106940275B CN106940275B CN201710173008.1A CN201710173008A CN106940275B CN 106940275 B CN106940275 B CN 106940275B CN 201710173008 A CN201710173008 A CN 201710173008A CN 106940275 B CN106940275 B CN 106940275B
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000009863 impact test Methods 0.000 title claims abstract description 26
- 238000012360 testing method Methods 0.000 claims abstract description 62
- 239000002131 composite material Substances 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 3
- 239000003550 marker Substances 0.000 claims description 3
- 241000251131 Sphyrna Species 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 description 2
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- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 230000001360 synchronised effect Effects 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/303—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated only by free-falling weight
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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
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
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- 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
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0039—Hammer or pendulum
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- 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
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
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- Engineering & Computer Science (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a plate clamp platform for drop hammer impact test and an impact speed measuring method. The clamp structure comprises a plate clamping device, a multi-angle rotating device and a clamp bottom plate; the multi-angle rotating device comprises a wallboard, a wallboard bolt and a bottom plate bolt; each wall plate is provided with a central hole and two arc-shaped grooves, and the two arc-shaped grooves are symmetrical about the central hole; when the wallboard bolts are completely unscrewed, the clamping plate can rotate along the arc-shaped groove; the supporting lifting structure comprises a platform and a lifting driving device, and the clamp bottom plate can rotate by taking a bottom plate bolt as a center and can slide along the straight hole; the laser sensor is arranged below the weight tray positioned at the periphery of the hammer head. The invention can provide fastening clamping for the composite material plate test piece, can realize multi-angle impact to the test piece, and can also measure the speed change in the falling and impact processes in real time.
Description
Technical Field
The invention relates to the field of mechanical property testing of materials, in particular to a plate clamp platform for a drop hammer impact test and an impact speed measuring method.
Background
At present, in the process of testing the mechanical properties of the composite material, it is essential to test the impact resistance of the composite material. To test and evaluate the impact resistance of a composite material, a drop impact test is generally performed on a composite material plate test piece. In the drop hammer impact test, it is required to achieve fixed clamping of a sheet test piece, and collect speed-time change curves in the drop hammer falling process and the impact process.
In the existing general composite material plate drop hammer impact test, drop hammers in the drop hammer impact device are all vertically dropped, and the center position of a test piece clamped on a test bed of the front impact drop hammer impact device is used for researching the mechanical response of the test piece material at the front impact moment and the residual strength after impact, and is used for evaluating the impact resistance of the material. After the test piece is clamped by the drop hammer impact device, the front impact test can be realized mostly, and the multi-angle drop hammer impact test is difficult to realize on one drop hammer impact device; meanwhile, the clamping device is generally and fixedly arranged on the drop hammer impact device, so that the impact of the fixed position of the test piece can be realized mostly, and the impact of different impact positions is difficult to realize.
Meanwhile, in the existing composite material plate drop hammer impact test, two time points of impact moment are generally collected by adopting a grating or a laser check point, the average speed of the section is calculated by using time variation as the impact moment speed, and then the impact force-time variation curve measured by a force sensor is combined, so that the speed-time variation curve in the impact process is calculated by a mechanical formula. The method is characterized in that the calculated average speed is calculated, and the calculation accuracy is low and the calculation process is complex by two sensors, namely an optical sensor and a force sensor. In addition, when the angular impact test is carried out, the measurement accuracy of the force sensor is seriously affected due to the influence of lateral force and friction force caused by the existence of the angle, and the difficulty in obtaining a speed-time change curve is increased.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and provides the plate clamp platform for the drop hammer impact test, which can provide fastening clamping for a composite material plate test piece, can realize multi-angle impact on the test piece and can also measure the speed change in the drop hammer falling and impact process in real time.
In order to solve the technical problems, the invention adopts the following technical scheme:
a plate clamp platform for drop hammer impact test comprises a clamp structure, a supporting lifting structure and a laser speed measuring device.
The clamp structure comprises a plate clamping device, a multi-angle rotating device and a clamp bottom plate.
The plate clamping device comprises a clamping plate and a clamping piece; the clamping plate center is provided with the test piece and strikes the groove, and the clamping piece sets up on the clamping plate that the groove both sides was impacted to the test piece, and the clamping piece can be dismantled with the clamping plate and be connected.
The multi-angle rotating device comprises a wallboard, a wallboard bolt and a bottom plate bolt; the two sides of the clamping plate are respectively provided with a wall plate, each wall plate is vertically arranged, and the bottom of each wall plate is fixedly connected with the bottom plate of the clamp; each wall plate is provided with a central hole and two arc-shaped grooves, and the two arc-shaped grooves are symmetrical about the central hole; the center hole and each arc groove are respectively provided with a wallboard bolt used for detachably connecting the wallboard with the clamping plate, and the wallboard bolts positioned in the arc grooves can slide along the arc grooves and be locked; when the wallboard bolts are completely unscrewed, the clamping plate can rotate along the arc-shaped groove.
The supporting lifting structure comprises a platform and a lifting driving device, and the platform can be lifted up and down highly under the action of the lifting driving device; the middle part of the platform is provided with a straight hole along the length direction, and the clamp bottom plate is detachably connected with the platform through a bottom plate bolt; the head of the bottom plate bolt is positioned above the clamp bottom plate, and the rod part of the bottom plate bolt sequentially penetrates through the clamp bottom plate and the straight strip hole and can slide along the straight strip hole and be locked and fixed; when the bottom plate bolt is unscrewed, the clamp bottom plate can rotate by taking the bottom plate bolt as the center and can slide along the straight strip hole.
The drop hammer is arranged above the clamp structure and comprises weights, weight trays and hammerheads which are coaxially arranged in sequence from top to bottom; the weight tray is fixedly connected with the hammer head, and the bottom of the hammer head points to the test piece impact groove on the clamping plate.
The laser speed measuring device comprises a laser sensor and a computer connected with the laser sensor, and the laser sensor is arranged below a weight disc positioned on the periphery of the hammer head.
Each arc groove is a 1/4 arc groove.
At least one arc groove is provided with angle scale marks.
The lifting driving device comprises a base, at least two screw rods, a hinge and a hinge driving device, wherein the middle part of each screw rod is in threaded connection with the platform, the bottom of each screw rod is in rotary connection with the base, the hinge is connected with all screw rods, and the hinge drives all screw rods to synchronously rotate under the driving of the hinge driving device.
The hinge driving device is a handle or a motor.
The invention also provides a method for measuring the impact speed by using the plate clamp platform for the drop hammer impact test, which can provide fastening clamping for a composite material plate test piece, can realize multi-angle impact on the test piece and can also measure the speed change in the drop hammer falling and impact process in real time.
A method for measuring impact speed by using a plate clamp platform for drop hammer impact test comprises the following steps.
Step 1, adjusting the height of a platform: and starting the lifting driving device to reduce the height of the platform.
Step 2, clamping a test piece: and placing the standard test piece of the composite material plate above the square groove of the clamping plate, and clamping the test piece through the clamping piece and the clamping plate fastening bolt.
Step 3, impact angle adjustment: firstly, determining an impact angle a of the test according to the requirement; then, all the wallboard bolts are unscrewed, and after the clamping plate is rotated to an angle a, the wallboard bolts are screwed down.
Step 4, marking the impact point positions: firstly, determining the impact position in the test according to the requirement; then, taking the center position of the test piece as an origin, and pointing the bottom of the hammer head to the origin at the moment; then, the polar coordinates of the impact point position are recorded as (m, n), and the impact point position is marked on the test piece by a marker.
Step 5, adjusting the impact point position: unscrewing the bolts of the bottom plate, moving the bottom plate of the clamp leftwards by a distance m, and then rotating the bottom plate of the clamp clockwise by an angle n to enable the impact point marked in the step 4 to be right below the hammer head.
Step 6, overlapping the hammer head and the impact point position: and (4) starting a lifting driving device, lifting the platform until the test piece contacts the hammer head, enabling the contact surface of the hammer head and the plate to coincide with the position of the impact point marked in the step (4), and then screwing the bottom plate bolt.
Step 7, laser sensor position adjustment: the laser sensor is arranged on the base, the laser sensor is turned on, data are transmitted to the computer through the data line, and the position of the laser sensor is adjusted to enable the laser sensor to be located below the weight tray on the periphery of the hammer head.
Step 8, laser speed measurement: resetting the laser sensor data, and performing an impact test; the laser sensor measures the instant speed of the weight tray in real time in the impact process, and the computer automatically records and draws the impact speed and time curve.
After the structure and the method are adopted, the clamping device not only can provide fastening clamping for the test piece of the composite material plate, but also can realize multi-angle impact on the test piece, and can also adjust the impact position of the test piece after the test piece is fastened, thereby improving the flexibility and convenience of test operation. In addition, through the design to anchor clamps platform structure, install laser sensor to the laser is from bottom to top to the mode of tup real-time collection drop hammer in-process speed variation that drops to avoid dropping the hammer in-process to collide laser sensor, realized dropping the hammer and impact in-process speed variation's real-time measurement, improved the measurement convenience, improved measurement accuracy through single sensor data, and avoided taking the angle to strike the problem that brings speed-time variation curve acquisition difficulty. The specific effect analysis is as follows:
1. through the assembly of the threaded rods protruding from the upper clamping plate and the lower clamping plate and the upper hole grooves of the left wall plate and the right wall plate, the rotation of the plate clamping device within the range of 0-90 degrees can be realized, and through the rotation of the plate clamping device, the drop hammer impact with any impact angle within the range of 0-90 degrees can be realized;
2. the translation and rotation of the clamp structure can be realized through the assembly of the screw rod protruding from the bottom of the bottom plate and the platform strip-shaped hole groove, and the drop hammer impact on any position of the surface of the test piece can be realized through adjusting the translation distance and the rotation angle;
3. compared with the method for measuring the speed change in the impact process by adopting the combination of the grating sensor and the force sensor, the method has the advantages that the single laser sensor is adopted, so that the test reliability is improved;
4. compared with the method that a grating sensor is adopted to collect the average speed in the impact moment time interval, and then the force sensor data is combined to calculate the impact process speed through the pushing of a mechanical formula, the laser sensor is adopted to measure the speed in real time, so that the difficulty of test data processing is reduced, and the measurement precision is improved;
5. the box body is divided into the upper part and the lower part, so that the collision to the laser sensor in the falling process of the drop hammer is effectively avoided, and the test safety is improved;
6. through the space that adopts lift platform to adjust upper and lower box, made things convenient for the change dismantlement of test piece, made things convenient for laser sensor's installation.
Drawings
Fig. 1 shows a schematic structural diagram of a plate clamp platform for drop hammer impact test according to the present invention.
Fig. 2 shows a top view of the drop hammer of the present invention.
Fig. 3 shows a front view of the drop hammer of the present invention.
The method comprises the following steps: 1. a clamping piece; 2. a clamping plate; 21. a test piece impact groove; 3. clamping plate fastening bolts; 4. a wall plate; 41. a central bore; 42. an arc-shaped groove; 5. drop hammer; 51. a hammer head; 52. a weight tray; 53. a weight; 54. a hammer rod; 55. a nut; 6. wallboard bolts; 7. a clamp base plate; 8. a platform; 81. a straight hole; 9. a base plate bolt; 10. a screw rod; 11. a hinge; 12. a handle; 13. a laser sensor; 14. a case; 141. a base.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
As shown in FIG. 1, the plate clamp platform for drop hammer impact test comprises a clamp structure, a supporting lifting structure and a laser speed measuring device.
The clamp structure comprises a plate clamping device, a multi-angle rotating device and a clamp bottom plate 7.
The plate clamping device comprises a clamping piece 1, a clamping plate 2 and a clamping plate fastening bolt 3.
The thickness of the clamping plate 2 is at least 20mm, the recommended size is 25mm, a test piece impact groove 21 is formed in the center of the clamping plate 2, and the test piece impact groove 21 is preferably a square groove with 150mm x 100mm depth of 4 mm.
The clamping piece is arranged on clamping plates on two sides of the test piece impact groove and is detachably connected with the clamping plates. Each clip is preferably threaded to the clip by three clip fastening bolts.
The multi-angle rotation device comprises a wall plate 4, a wall plate bolt 6 and a bottom plate bolt 9.
The splint both sides respectively set up a wallboard, and every wallboard all vertically sets up, and every wallboard bottom all is with anchor clamps bottom plate 7 fixed connection, preferably welds.
Each wall plate is provided with a central hole 41 and two arc-shaped grooves 42 which are symmetrical with respect to the central hole; the center hole and each arc groove are respectively provided with a wallboard bolt used for detachably connecting the wallboard with the clamping plate, and the wallboard bolts positioned in the arc grooves can slide along the arc grooves and be locked; when the wallboard bolts are completely unscrewed, the clamping plate can rotate along the arc-shaped groove.
Each arc groove is preferably a 1/4 arc groove, namely, the clamping plate can rotate 90 degrees along the arc groove.
Further, at least one arc-shaped groove is provided with angle graduation marks.
The supporting lifting structure comprises a platform 8 and a lifting driving device, and the platform can be lifted up and down highly under the action of the lifting driving device.
The middle part of the platform is provided with a straight hole 81 along the length direction, and the clamp bottom plate is detachably connected with the platform through a bottom plate bolt; the head of the bottom plate bolt is positioned above the clamp bottom plate, and the rod part of the bottom plate bolt sequentially penetrates through the clamp bottom plate and the straight strip hole and can slide along the straight strip hole and be locked and fixed; when the bottom plate bolt is unscrewed, the clamp bottom plate can rotate by taking the bottom plate bolt as the center and can slide along the straight strip hole.
The drop hammer is arranged above the fixture structure, and as shown in fig. 2 and 3, the drop hammer comprises a weight 53, a weight tray 52 and a hammer head 51 which are coaxially arranged in sequence from top to bottom.
The hammer head is preferably arranged integrally with the hammer rod 54, the weight tray is fixedly connected with the hammer head, and the weight is sleeved on the hammer rod above the weight tray; the bottom of the hammer head points to a test piece impact groove on the clamping plate.
The lifting driving means preferably includes a base 141, a screw 10, a hinge 11, and a hinge driving means.
The base 141 is preferably the bottom plate of box 14, and five faces of box 14 back and forth are the closed face about, and the front is the open face, and platform 8 is preferably cut apart into upper and lower two parts with box 14, has effectively avoided the collision to laser sensor in the drop hammer whereabouts in-process, has improved experimental security.
At least two screw rods are provided, and two screw rods are preferred in the invention.
The middle part of every lead screw all is connected with the platform thread, and the bottom of every lead screw all rotates with the base to be connected, and the hinge is connected with all lead screws, and the hinge drives all lead screws synchronous rotation under the drive of hinge drive arrangement.
The hinge driving device is a handle 12 or a motor and the like, and the hinge forms a triangle shape around the screw rod and the handle; the screw rod is in threaded connection with the platform.
The laser speed measuring device comprises a laser sensor 13 and a computer connected with the laser sensor, wherein the laser sensor is arranged below a weight tray positioned on the periphery of the hammer head. The laser sensor comprises a laser emitting end and a laser receiving end.
A method for measuring impact speed by using a plate clamp platform for drop hammer impact test comprises the following steps.
Step 1, adjusting the height of a platform: and starting the lifting driving device to reduce the height of the platform.
Step 2, clamping a test piece: and placing the standard test piece of the composite material plate above the square groove of the clamping plate, and clamping the test piece through the clamping piece and the clamping plate fastening bolt.
The dimensions of the composite sheet standard test piece are preferably 150mm x 100mm x 5mm.
Step 3, impact angle adjustment: firstly, determining an impact angle a of the test according to the requirement; then, all the wallboard bolts are unscrewed, and after the clamping plate is rotated to an angle a, the wallboard bolts are screwed down.
Step 4, marking the impact point positions: firstly, determining the impact position in the test according to the requirement; then, taking the center position of the test piece as an origin, and pointing the bottom of the hammer head to the origin at the moment; then, the polar coordinates of the impact point position are recorded as (m, n), and the impact point position is marked on the test piece by a marker.
Step 5, adjusting the impact point position: unscrewing the bolts of the bottom plate, moving the bottom plate of the clamp leftwards by a distance m, and then rotating the bottom plate of the clamp clockwise by an angle n to enable the impact point marked in the step 4 to be right below the hammer head.
Step 6, overlapping the hammer head and the impact point position: and (4) starting a lifting driving device, lifting the platform until the test piece contacts the hammer head, enabling the contact surface of the hammer head and the plate to coincide with the position of the impact point marked in the step (4), and then screwing the bottom plate bolt.
Step 7, laser sensor position adjustment: the laser sensor is arranged on the base, the laser sensor is turned on, data are transmitted to the computer through the data line, and the position of the laser sensor is adjusted to enable the laser sensor to be located below the weight tray on the periphery of the hammer head.
Step 8, laser speed measurement: resetting the laser sensor data, and performing an impact test; the laser sensor measures the instant speed of the weight tray in real time in the impact process, and the computer automatically records and draws the impact speed and time curve.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various equivalent changes can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the equivalent changes belong to the protection scope of the present invention.
Claims (4)
1. A method for measuring impact speed by using a plate clamp platform for drop hammer impact test is characterized in that:
the plate clamp platform for the drop hammer impact test comprises a clamp structure, a supporting lifting structure and a laser speed measuring device;
the clamp structure comprises a plate clamping device, a multi-angle rotating device and a clamp bottom plate;
the plate clamping device comprises a clamping plate and a clamping piece; the center of the clamping plate is provided with a test piece impact groove, the clamping pieces are arranged on the clamping plates on two sides of the test piece impact groove, and the clamping pieces are detachably connected with the clamping plates;
the multi-angle rotating device comprises a wallboard, a wallboard bolt and a bottom plate bolt; the two sides of the clamping plate are respectively provided with a wall plate, each wall plate is vertically arranged, and the bottom of each wall plate is fixedly connected with the bottom plate of the clamp; each wall plate is provided with a central hole and two arc-shaped grooves, and the two arc-shaped grooves are symmetrical about the central hole; each arc groove is a 1/4 arc groove, and the clamping plate can rotate 90 degrees along the arc groove;
the center hole and each arc groove are respectively provided with a wallboard bolt used for detachably connecting the wallboard with the clamping plate, and the wallboard bolts positioned in the arc grooves can slide along the arc grooves and be locked; when the wallboard bolts are completely unscrewed, the clamping plate can rotate along the arc-shaped groove;
the supporting lifting structure comprises a platform and a lifting driving device, and the platform can be lifted up and down highly under the action of the lifting driving device; the middle part of the platform is provided with a straight hole along the length direction, and the clamp bottom plate is detachably connected with the platform through a bottom plate bolt; the head of the bottom plate bolt is positioned above the clamp bottom plate, and the rod part of the bottom plate bolt sequentially penetrates through the clamp bottom plate and the straight strip hole and can slide along the straight strip hole and be locked and fixed; when the bottom plate bolt is unscrewed, the clamp bottom plate can rotate by taking the bottom plate bolt as a center and can slide along the straight strip hole;
the drop hammer is arranged above the clamp structure and comprises weights, weight trays and hammerheads which are coaxially arranged in sequence from top to bottom; the weight tray is fixedly connected with the hammer head, and the bottom of the hammer head points to a test piece impact groove on the clamping plate;
the laser speed measuring device comprises a laser sensor and a computer connected with the laser sensor, and the laser sensor is arranged below a weight disc positioned on the periphery of the hammer head;
the measuring method comprises the following steps:
step 1, adjusting the height of a platform: starting a lifting driving device to reduce the height of the platform;
step 2, clamping a test piece: placing a standard test piece of the composite material plate above the square groove of the clamping plate, and clamping the test piece through the clamping piece and the clamping plate fastening bolt;
step 3, impact angle adjustment: firstly, determining an impact angle a of the test according to the requirement; then, loosening all the wallboard bolts, and tightening the wallboard bolts after rotating the clamping plate to an angle a;
step 4, marking the impact point positions: firstly, determining the impact position in the test according to the requirement; then, taking the center position of the test piece as an origin, and pointing the bottom of the hammer head to the origin at the moment; then, the polar coordinates of the impact point positions are recorded as (m, n), and the impact point positions are marked on the test piece by using a marker;
step 5, adjusting the impact point position: unscrewing a bottom plate bolt, moving a clamp bottom plate leftwards by a distance m, and then rotating clockwise by an angle n to enable the impact point marked in the step 4 to be right below the hammer head;
step 6, overlapping the hammer head and the impact point position: starting a lifting driving device, lifting the platform until the test piece contacts the hammer head, enabling the contact surface of the hammer head and the plate to coincide with the position of the impact point marked in the step 4, and then screwing the bottom plate bolt;
step 7, laser sensor position adjustment: the laser sensor is arranged on the base, the laser sensor is turned on, data are transmitted to the computer through the data line, and the position of the laser sensor is adjusted to enable the laser sensor to be positioned below the weight disc on the periphery of the hammer head;
step 8, laser speed measurement: resetting the laser sensor data, and performing an impact test; the laser sensor measures the instant speed of the weight tray in real time in the impact process, and the computer automatically records and draws the impact speed and time curve.
2. The method for measuring impact velocity using a plate holder platform for drop hammer impact test according to claim 1, wherein: at least one arc groove is provided with angle scale marks.
3. The method for measuring impact velocity using a plate holder platform for drop hammer impact test according to claim 1, wherein: the lifting driving device comprises a base, at least two screw rods, a hinge and a hinge driving device, wherein the middle part of each screw rod is in threaded connection with the platform, the bottom of each screw rod is in rotary connection with the base, the hinge is connected with all screw rods, and the hinge drives all screw rods to synchronously rotate under the driving of the hinge driving device.
4. A method of measuring impact velocity using a panel clamp platform for drop hammer impact test according to claim 3, wherein: the hinge driving device is a handle or a motor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710173008.1A CN106940275B (en) | 2017-03-22 | 2017-03-22 | Plate clamp platform for drop hammer impact test and impact speed measuring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710173008.1A CN106940275B (en) | 2017-03-22 | 2017-03-22 | Plate clamp platform for drop hammer impact test and impact speed measuring method |
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| CN106940275A CN106940275A (en) | 2017-07-11 |
| CN106940275B true CN106940275B (en) | 2023-09-19 |
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