CN113447198B - Thrust calibrating device of push-pull force testing machine - Google Patents
Thrust calibrating device of push-pull force testing machine Download PDFInfo
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- CN113447198B CN113447198B CN202110779606.XA CN202110779606A CN113447198B CN 113447198 B CN113447198 B CN 113447198B CN 202110779606 A CN202110779606 A CN 202110779606A CN 113447198 B CN113447198 B CN 113447198B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
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Abstract
The invention provides a thrust calibrating device of a push-pull force testing machine, which comprises: the device comprises a thrust stress shaft, a lever assembly, a supporting seat, a bottom plate, a rotating assembly and a weight hanging piece, wherein the lever assembly is arranged on the supporting seat through the rotating assembly, the supporting seat is arranged on the bottom plate, the thrust stress shaft is arranged at one end of the lever assembly, and the weight hanging piece is arranged at the other end of the lever assembly; the distance between the axis of the thrust force bearing shaft and the axis of the rotating assembly is smaller than the distance between the axis of the weight hanging piece and the axis of the rotating assembly; in the thrust correction process, after weights are hung, the thrust sensor is controlled to descend, and horizontal thrust is applied to the thrust stress shaft to realize thrust correction. The invention can ensure the consistency of the actual measurement precision and the calibration precision, and greatly reduces the overall dimension of the whole thrust calibration device through the optimal design of the two-stage lever, so that the volume of the whole thrust calibration device is smaller and more convenient.
Description
Technical Field
The present disclosure relates to thrust calibration devices, and particularly to a thrust calibration device for a push-pull force tester.
Background
In the semiconductor industry, a push-pull force test device is an indispensable device, the device mainly detects the shearing strength of a chip, the shearing strength of a solder ball, the reliability of a bonding wire and the like through a mechanical sensor, and the accuracy requirement of the push-pull sensor is very critical when the test is performed, so that the push-pull sensor needs to be calibrated frequently to ensure the accuracy of the sensor during the test, the accuracy of the sensor can be obtained more accurately only through simulating the action of a measured product during the calibration of the push-pull sensor, and the push-pull force sensor needs to be calibrated directly through weights, so that a plurality of push-pull calibration devices on the market at present calibrate through other sensors or without simulating the action of the measured product, the accuracy during the real time of the operation and the accuracy during the calibration have certain deviation, and huge devices are needed during the large-force calibration, and the calibration through weights is difficult.
Disclosure of Invention
The invention aims to solve the technical problem of providing a thrust calibration device which can ensure that the actual measurement precision is consistent with the calibration precision as much as possible and further reduce the volume of the device during large-force calibration and is suitable for a push-pull force testing machine.
In view of the above, the present invention provides a thrust calibration device of a push-pull force tester, comprising: the device comprises a thrust stress shaft, a lever assembly, a supporting seat, a bottom plate, a rotating assembly and a weight hanging piece, wherein the lever assembly is arranged on the supporting seat through the rotating assembly, the supporting seat is arranged on the bottom plate, the thrust stress shaft is arranged at one end of the lever assembly, and the weight hanging piece is arranged at the other end of the lever assembly; the distance between the axis of the thrust force bearing shaft and the axis of the rotating assembly is smaller than the distance between the axis of the weight hanging piece and the axis of the rotating assembly; in the thrust force correction process, the weight for calibration is hung through the weight hanging piece, and then the thrust force sensor is controlled to descend and apply horizontal thrust to the thrust force bearing shaft, so that the weight is lifted up to realize thrust force correction.
The invention further improves that the rotating assembly comprises a first rotating shaft and a first bearing, wherein the first rotating shaft is sleeved in the first bearing, the lever assembly is rotationally connected with the supporting seat through the first rotating shaft and the first bearing, and the axis of the rotating assembly is the axis of the first rotating shaft.
The invention further improves that the lever assembly comprises a single-stage lever, wherein one end of the single-stage lever, which is far away from the weight hanging piece, is a first force arm, one end of the single-stage lever, which is close to the weight hanging piece, is a second force arm, and the rotating assembly is arranged between the first force arm and the second force arm; the first force arm is positioned above the rotating assembly, and the thrust force bearing shaft is arranged at one side of the top of the first force arm, which is close to the second force arm.
The lever assembly further comprises a weight arm and a first weight mechanism, wherein the weight arm is arranged at one end of the first force arm far away from the second force arm, and the first weight mechanism is arranged at one end of the weight arm far away from the second force arm.
The invention further improves that the lever assembly comprises a first-stage lever, a second rotating shaft and a second bearing, wherein the first-stage lever is in rotating connection with the supporting seat through the rotating assembly, the second-stage lever is in rotating connection with the supporting seat through the second rotating shaft and the second bearing, the weight hanging piece is arranged at one end of the second-stage lever, and the first-stage lever is arranged at the other end of the second-stage lever.
The invention further improves that the thrust force bearing shaft is arranged above the rotating assembly and is arranged at the top of one end of the first-stage lever far away from the second-stage lever.
The invention further improves that the invention also comprises a second weight mechanism, wherein the second weight mechanism is arranged at one end of the first-stage lever, which is close to the second-stage lever.
The invention is further improved in that a first notch is formed in the bottom of one end, close to the second level lever, of the first level lever, a second notch is formed in the top of one end, close to the first level lever, of the second level lever, and the first notch and the second notch are matched with each other; the first notch is provided with a third bearing for pressing on the second-stage lever.
The invention is further improved in that one end of the supporting seat far away from the first-stage lever is provided with a horizontal shaft, and the horizontal shaft is arranged below the second-stage lever and is arranged on one side of the second rotating shaft close to the weight suspension part.
The invention further improves that one end of the first-stage lever, which is close to the second-stage lever, is provided with a first weight adjusting hole, and the second-stage lever is uniformly provided with a row of second weight adjusting holes.
Compared with the prior art, the invention has the beneficial effects that: the thrust calibration device of hanging the weight is realized through the optimized structural design, the calibration action and the consistency of the actual test product action are utilized to achieve the purpose that the calibration precision and the precision in the actual use sensor test cannot deviate, the consistency of the actual measurement precision and the calibration precision is ensured, on the basis, the overall dimension of the whole thrust calibration device is greatly reduced through the optimized design of the two-stage lever, and the volume of the thrust calibration device is smaller and more convenient.
Drawings
FIG. 1 is a schematic perspective view of an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of an embodiment of the present invention;
FIG. 3 is a schematic perspective view of another embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of another embodiment of the present invention;
FIG. 5 is a schematic side view of another embodiment of the present invention;
fig. 6 is a schematic top view of another embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1 to 6, this example provides a thrust calibration device of a push-pull force testing machine, including: the device comprises a thrust stress shaft 2, a lever assembly, a supporting seat 3, a bottom plate 4, a rotating assembly and a weight suspension 5, wherein the lever assembly is arranged on the supporting seat 3 through the rotating assembly, the supporting seat 3 is arranged on the bottom plate 4, the thrust stress shaft 2 is arranged at one end of the lever assembly, and the weight suspension 5 is arranged at the other end of the lever assembly; the distance between the axis of the thrust bearing shaft 2 and the axis of the rotating assembly is smaller than the distance between the axis of the weight hanging piece 5 and the axis of the rotating assembly; in the thrust force correction process, a calibration weight is hung through the weight hanging piece 5, and then the thrust force sensor is controlled to descend and apply horizontal thrust to the thrust force bearing shaft 2, so that the weight is lifted up to achieve thrust force correction.
It should be noted that, in this example, the distance between the axis of the thrust bearing shaft 2 and the axis of the rotating assembly is preferably smaller than the distance between the axis of the weight hanging member 5 and the axis of the rotating assembly, so that the design can realize the large thrust calibration through the weight with small mass; of course, in practical applications, the distance between the axis of the thrust bearing shaft 2 and the axis of the rotating assembly may be greater than or equal to the distance between the axis of the weight hanger 5 and the axis of the rotating assembly.
The thrust stress shaft 2 in this example is a stress shaft of the thrust sensor 1 for providing a horizontal thrust force F1 during testing, the lever assembly comprises a single-stage lever as shown in fig. 1 and 2 or a double-stage lever as shown in fig. 3 to 6, and the support seat 3 is used for supporting the lever assembly; the bottom plate 4 is a mounting bottom plate of the supporting seat 3 and is used for mounting the thrust calibration device into a push-pull force testing machine, and the rotating component is a rotating piece between the lever component and the supporting seat 3 and is used as a fulcrum of the lever component; the weight hanger 5 is used for hanging weights 18.
As shown in fig. 1 to 6, the rotating assembly in this example includes a first rotating shaft 6 and a first bearing 7, the first rotating shaft 6 is sleeved in the first bearing 7, the lever assembly is rotatably connected with the supporting seat 3 through the first rotating shaft 6 and the first bearing 7, and the axis of the rotating assembly is the axis of the first rotating shaft 6. The rotary connection between the lever assembly and the supporting seat 3 is preferably realized by adopting the first rotary shaft 6 and the first bearing 7, so that the friction coefficient can be effectively reduced, the high-precision calibration is ensured, moreover, the lever arm of the lever assembly adopts the axle center to form the arm of force, the fluctuation of thrust during the calibration can be smaller, and the precision is high.
As shown in fig. 1 and 2, the lever assembly of this example includes a single-stage lever, one end of the single-stage lever, which is far away from the weight suspension 5, is a first force arm 8, the first force arm 8 refers to a force arm where the thrust force bearing shaft 2 is located, and the force arm where the thrust force bearing shaft 2 is located is a distance L1 between the axis of the thrust force bearing shaft 2 and the axis of the first rotating shaft 6; the end of the single-stage lever, which is close to the weight hanging part 5, is a second force arm 9, the second force arm 9 refers to a force arm where the weight 18 is located, and the force arm where the weight 18 is located is a distance L2 between the axis of the weight hanging part 5 and the axis of the first rotating shaft 6; the rotating assembly is arranged between the first force arm 8 and the second force arm 9; the first force arm 8 is located above the rotating assembly, and the thrust bearing shaft 2 is arranged on one side, close to the second force arm 9, of the top of the first force arm 8, so that convenience of the thrust sensor 1 in place during testing is improved. Preferably, as shown in fig. 1 and fig. 2, in the design of the single-stage lever, a buffer gap is preferably provided below the thrust force bearing shaft 2, and the buffer gap is a gap for realizing a buffer effect, so that the thrust force bearing shaft 2 can realize a protection effect through buffering when receiving horizontal thrust force through the arrangement of the buffer gap, which is also convenient for improving the accuracy of calibration.
It should be noted that the lever assembly of this example further includes a weight arm 10 and a first weight mechanism 11, the weight arm 10 being a member for realizing weight, for avoiding unbalance due to the weight of the second arm 9; the first weight mechanism 11 is used for realizing balance adjustment by adding weight, and the first weight mechanism 11 preferably comprises a weight mechanism in the form of a screw or a bolt; the weight arm 10 is disposed at an end of the first arm 8 away from the second arm 9, and the first weight mechanism 11 is disposed at an end of the weight arm 10 away from the second arm 9. On the other hand, the second force arm 9 in this example is also preferably provided with a weight adjusting hole, and the weight adjusting hole is preferably a hollow hole, so that the weight of the second force arm 9 can be reduced through the arrangement of the weight adjusting hole due to the longer length of the second force arm 9, the weight adjusting hole is convenient to balance, the number of the weight adjusting holes is multiple, and the weight adjusting holes are uniformly distributed in the second force arm 9. At this time, the two ends of the lever assembly in this example are preferably provided with weight balancing devices (i.e. the weight arm 10, the first weight balancing mechanism 11 and the weights), so that balance adjustment of the lever can be quickly realized, and the working efficiency of thrust calibration can be improved in an auxiliary manner.
In summary, as shown in fig. 1 and fig. 2, the thrust calibration device is realized by using the single-stage lever principle and the overall structure optimization design of the device, and the calculation formula is as follows: l1=l2×g, where L1 is a moment arm distance between the axis of the thrust bearing shaft 2 and the axis of the first rotating shaft 6, i.e. a moment arm distance of the first moment arm 8; f1 is the horizontal thrust provided by thrust sensor 1 during testing; l2 is the arm distance between the axis of the weight hanging piece 5 and the axis of the first rotating shaft 6, namely the arm distance of the second arm 9; g is the gravity of weight 18, can see through the formula, when L2 is greater than L1, can realize the thrust sensor calibration of high thrust through the low mass weight, still through the design of axle center arm of force for the fluctuation of atress is littleer when calibrating, has guaranteed thrust calibration's precision more effectively, and this example's simple structure is just reasonable reliable, small.
As shown in fig. 3 to 6, the lever assembly of this example includes a first-stage lever 12, a second-stage lever 13, a second rotation shaft 14, and a second bearing 15, the first-stage lever 12 is rotatably connected with the support base 3 through the rotation assembly (i.e., the first rotation shaft 6 and the first bearing 7), the second-stage lever 13 is rotatably connected with the support base 3 through the second rotation shaft 14 and the second bearing 15, the weight hanger 5 is disposed at one end of the second-stage lever 13, and the first-stage lever 12 is disposed at the other end of the second-stage lever 13.
In this example, the axis of the first rotation shaft 6 is a fulcrum of the first level lever 12, the second rotation shaft 14 is a fulcrum of the second level lever 13, the arms of force of the two levels of levers can rotate around the respective fulcrums, the third bearing 122 on the first level lever 12 falls on the second rotation shaft 14, the weight of the first level lever 12 pressing against the second level lever 13 is to balance the second level lever 13, that is, the weights at two ends of the fulcrum of the second level lever 13 are like a balance, so that when the thrust calibration device balances, the weight when the weight 18 is hung on directly reflects the horizontal thrust of the thrust bearing shaft 2. Preferably, as shown in fig. 3 to 5, in the design of the two-stage lever, a buffer gap is preferably provided on the side of the thrust bearing shaft 2 close to the second-stage lever 13, the buffer gap is a gap for realizing a buffer effect, and by setting the buffer gap, the thrust bearing shaft 2 can realize a protection effect through buffering when receiving a horizontal thrust, so that the accuracy of calibration is also facilitated to be improved.
It is worth to say that, in this example, the rotary connection between the first level lever 12 and the second level lever 13 and the supporting seat 3 respectively adopts rotation axis and bearing to realize, can effectively reduce coefficient of friction, guarantee the calibration of high accuracy, and, lever arm of the lever subassembly all adopts the axle center to form the arm of force, and the fluctuation of thrust can be less during the calibration, and the precision is high.
As shown in fig. 3 to 5, in this embodiment, the thrust bearing shaft 2 is disposed above the rotating assembly and on the top of the end of the first stage lever 12 away from the second stage lever 13, so as to facilitate the improvement of the convenience of the thrust sensor 1 in place during testing; the present example also preferably includes a second weight mechanism 16, where the second weight mechanism 16 is used to implement balance adjustment by adding weight, and the second weight mechanism 16 preferably includes a weight mechanism in the form of a screw or a bolt, and it should also be noted that the weight of the first lever 12 pressing against the second lever 13 is required to balance the second lever 13, and the length of the second lever 13 is greater than that of the first lever 12, so that, in addition to the balance adjustment, the second weight mechanism 16 is preferably disposed at an end of the first lever 12 near the second lever 13, and can also function to well press the second lever 13 to avoid the second lever 13 from tilting.
As shown in fig. 3, in this embodiment, a first notch 121 is disposed at the bottom of the end of the first lever 12 near the second lever 13, and the first notch 121 is preferably a circular arc notch; a second gap 131 is arranged at the top of one end of the second-stage lever 13, which is close to the first-stage lever 12, and the second gap 131 is also preferably an arc gap, and the first gap 121 and the second gap 131 are matched with each other, so that the connection between the two stages of levers is convenient to realize; the first notch 121 is provided with a third bearing 122 for pressing on the second-stage lever 13, and by the arrangement of the third bearing 122, the friction force of the first-stage lever 12 is smaller and the calibration precision is higher when the second-stage lever 13 is pressed.
In this example, a horizontal shaft 17 is disposed at one end of the support seat 3 away from the first-stage lever 12, and the horizontal shaft 17 is disposed below the second-stage lever 13, and disposed at one side of the second rotary shaft 14 near the weight suspension 5, for assisting in supporting the second-stage lever 13, so as to ensure stable reliability of the product.
The first-stage lever 12 is provided with a first weight adjusting hole 123 near the end of the second-stage lever 13, the first weight adjusting hole 123 may be preferably a waist-shaped hole, the first weight adjusting hole 123 is disposed at the end of the second weight balancing mechanism 16 far away from the second-stage lever 13, and is used for removing weight, and the weight is achieved by the size of the waist-shaped hole when the weight of two sides is calculated; a row of second weight adjusting holes 132 are uniformly formed in the second-stage lever 13, and the second weight adjusting holes 132 are preferably hollow holes, and because the length of the second-stage lever 13 is longer, the weight of the second-stage lever can be reduced through the arrangement of the second weight adjusting holes 132, so that the balance is facilitated.
In summary, as shown in fig. 3 to 6, the thrust calibration device is realized by using the two-stage lever principle and the overall structure optimization design of the device, and the calculation formula is as follows: l1=l2' ×f2, l3×f2=l4×g, where L1 is a moment arm distance between the axis of the thrust force bearing shaft 2 and the axis of the first rotation shaft 6, and F1 is a horizontal thrust provided by the thrust force sensor 1 during testing; l2' is the arm distance between the axis of the third bearing 122 and the axis of the first rotating shaft 6, and F2 is the vertical pressure of the third bearing 122 to the second lever 13; l3 is the arm distance between the axle center of the third bearing 122 and the axle center of the second rotating shaft 14, L4 is the arm distance between the axle center of the second rotating shaft 14 and the axle center of the weight hanging piece 5, G is the gravity of the weight 18, and the formula can show that the distance required by the arm can be obviously reduced through the design of the two-stage lever, and further the calibration of the thrust sensor with high thrust can be realized through the weight with small mass, and the fluctuation of the stress during the calibration is smaller through the design of the axle center arm, so that the accuracy of the thrust calibration is more effectively ensured, and the structure of the example is simple, reasonable and reliable, and the volume is small.
Whether a single stage lever or a dual stage lever, the calibration process of this example includes: step S1, hanging a weight 18 for calibration on a lever assembly; step S2, placing the thrust sensor 1 above the rear of the thrust stress shaft 2 in a suspended state, and preventing the thrust sensor from contacting anything; s3, inputting a calibration coefficient in a control interface, and then starting to calibrate; and S4, judging whether the calibrated thrust sensor 1 is qualified or not by judging whether the lever assembly reaches balance or not. The calibration coefficient can be represented by a coefficient K, the calibration coefficient is self-defined and adjusted according to actual requirements, after calibration is started, the thrust sensor 1 automatically descends to contact the bottom plane and then lifts up to a certain height, and then the thrust stress shaft 2 is horizontally pushed to lift up the weight 18; during actual testing, the push sensor 1 is suspended above the rear of the product (corresponding to the push force bearing shaft 2), then testing is started, the push sensor 1 automatically descends to contact the substrate of the product, then vertically lifts up to a set height, and then pushes away the front solder balls such as BGA balls on the PCB in a horizontal direction, so that the consistency of calibration and actual testing is realized.
In summary, the thrust calibration device for hanging weights is realized through the optimized structural design, the purpose that the calibration precision and the precision in the actual use sensor test cannot deviate is achieved by utilizing the consistency of the calibration action and the actual test product action, the consistency of the actual measurement precision and the calibration precision is ensured, and on the basis, the overall dimension of the whole thrust calibration device is greatly reduced through the optimized design of the two-stage lever, so that the volume of the thrust calibration device is smaller and more convenient.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (10)
1. A thrust calibration device for a push-pull force tester, comprising: the device comprises a thrust stress shaft, a lever assembly, a supporting seat, a bottom plate, a rotating assembly and a weight hanging piece, wherein the lever assembly is arranged on the supporting seat through the rotating assembly, the supporting seat is arranged on the bottom plate, the thrust stress shaft is arranged at one end of the lever assembly, and the weight hanging piece is arranged at the other end of the lever assembly; the distance between the axis of the thrust force bearing shaft and the axis of the rotating assembly is smaller than the distance between the axis of the weight hanging piece and the axis of the rotating assembly; in the thrust force correction process, a calibration weight is hung through the weight hanging piece, and then a thrust force sensor is controlled to descend and apply horizontal thrust to the thrust force bearing shaft, so that the weight is lifted up to realize thrust force correction;
the lever assembly comprises a single-stage lever or a double-stage lever, and a buffer gap is arranged below the thrust stress shaft in the single-stage lever; in the two-stage lever, a buffer gap is arranged on one side of the thrust bearing shaft, which is close to the second-stage lever.
2. The thrust calibration device of a push-pull force tester according to claim 1, wherein the rotating assembly comprises a first rotating shaft and a first bearing, the first rotating shaft is sleeved in the first bearing, the lever assembly is rotatably connected with the supporting seat through the first rotating shaft and the first bearing, and the axis of the rotating assembly is the axis of the first rotating shaft.
3. The thrust calibration device of a push-pull force tester according to claim 1 or 2, wherein the lever assembly comprises a single-stage lever, one end of the single-stage lever, which is far away from the weight suspension member, is a first force arm, one end of the single-stage lever, which is near the weight suspension member, is a second force arm, and the rotating assembly is arranged between the first force arm and the second force arm; the first force arm is positioned above the rotating assembly, and the thrust force bearing shaft is arranged at one side of the top of the first force arm, which is close to the second force arm.
4. The thrust calibration device of a push-pull force tester of claim 3, wherein the lever assembly further comprises a weight arm disposed at an end of the first force arm remote from the second force arm and a first weight mechanism disposed at an end of the weight arm remote from the second force arm.
5. The thrust calibration device of a push-pull force tester according to claim 1 or 2, wherein the lever assembly comprises a first-stage lever, a second rotation shaft and a second bearing, the first-stage lever is rotatably connected with the support base through the rotation assembly, the second-stage lever is rotatably connected with the support base through the second rotation shaft and the second bearing, the weight hanging piece is arranged at one end of the second-stage lever, and the first-stage lever is arranged at the other end of the second-stage lever.
6. The thrust calibration device of a push-pull force tester according to claim 5, wherein the thrust force bearing shaft is disposed above the rotating assembly and on top of an end of the first-stage lever away from the second-stage lever.
7. The thrust calibration device of a push-pull force tester according to claim 5, further comprising a second weight mechanism disposed at an end of the first stage lever adjacent to the second stage lever.
8. The thrust calibration device of a push-pull force testing machine according to claim 5, wherein a first notch is formed in the bottom of one end of the first-stage lever, which is close to the second-stage lever, a second notch is formed in the top of one end of the second-stage lever, which is close to the first-stage lever, and the first notch and the second notch are matched with each other; the first notch is provided with a third bearing for pressing on the second-stage lever.
9. The thrust calibration device of a push-pull force tester according to claim 5, wherein a horizontal shaft is disposed at one end of the support base away from the first-stage lever, and the horizontal shaft is disposed below the second-stage lever and on one side of the second rotation shaft near the weight hanger.
10. The thrust calibration device of a push-pull force tester according to claim 5, wherein a first weight adjusting hole is formed at one end of the first-stage lever, which is close to the second-stage lever, and a row of second weight adjusting holes are uniformly formed in the second-stage lever.
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| CN202110779606.XA CN113447198B (en) | 2021-07-09 | 2021-07-09 | Thrust calibrating device of push-pull force testing machine |
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| CN1920500A (en) * | 2005-08-10 | 2007-02-28 | 梅特勒-托莱多股份公司 | Electronic weighing device comprising a coupling assembly for a calibrating weight |
| JP2015222216A (en) * | 2014-05-23 | 2015-12-10 | 株式会社豊田中央研究所 | Force sensor testing device |
| CN205157111U (en) * | 2015-11-30 | 2016-04-13 | 广电计量检测（天津）有限公司 | Portable calibrating device for pull pressure sensor |
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