CN214277761U - Double-fulcrum loading and unloading unit of hardness tester - Google Patents
Double-fulcrum loading and unloading unit of hardness tester Download PDFInfo
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- CN214277761U CN214277761U CN202120279312.6U CN202120279312U CN214277761U CN 214277761 U CN214277761 U CN 214277761U CN 202120279312 U CN202120279312 U CN 202120279312U CN 214277761 U CN214277761 U CN 214277761U
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Abstract
The utility model discloses a double-fulcrum loading and unloading unit of a sclerometer, wherein the front end of a small lever is hinged on a front bracket through a fulcrum A, the rear end of the small lever is hinged with the upper end of a connecting rod B, and the lower end of the connecting rod B passes through a through hole on a big lever and is hinged with a screw rod; a large belt wheel is arranged on a nut in threaded fit with the screw rod and is in transmission connection with a small belt wheel on the stepping motor through a synchronous belt; a large lever is arranged below the small lever, the rear end of the large lever is hinged on the rear bracket through a fulcrum B, a connecting rod A is hinged between the front end of the large lever and the front end of the small lever, and a force sensor is arranged at the lower part of the front end of the large lever through a force sensor seat; the middle of the big lever is provided with a ball embedding screw which is tightly propped against the top of the reset mandril, and the excircle of the reset base and the excircle of the reset mandril inserted into the central hole of the reset base are sleeved with a reset spring. The device can eliminate the phenomenon that the direction of the force applied by the force sensor deviates from the vertical line by a large angle, ensure the accuracy of the applied test force, and has easy control precision and high hardness value measurement precision.
Description
Technical Field
The utility model relates to a sclerometer technical field specifically is a two fulcrums of sclerometer add off-load unit.
Background
Hardness values are typically measured by loading a specified indenter with a specified test force and measuring the indentation.
The front end of a small lever in the existing hardometer loading and unloading mechanism is hinged on a base through a fulcrum A, and the tail end of the small lever is hinged with a connecting rod which can move up and down through a rotating shaft. When the device works, the stepping motor drives the tail end of the small lever to move up and down, and the small lever swings up and down around the fulcrum shaft A in a large amplitude, so that the force sensor at the front end of the small lever is driven to swing in a large amplitude, the direction of the force applied by the force sensor deviates from the vertical direction by a large angle, the force applied by the force sensor is inaccurate and difficult to control, and the accuracy of hardness value measurement is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a can overcome above-mentioned not enough sclerometer double-fulcrum adds off-load unit is provided, and it can eliminate the phenomenon of the skew perpendicular line great angle of the direction of force sensor application, and the accuracy that the assurance test power was exerted, easily control accuracy, hardness number measurement accuracy is high.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
the hardness tester double-fulcrum loading and unloading unit comprises a fulcrum A, a small lever, a connecting rod A, a fulcrum B, a large lever, a force sensor, a stepping motor, a small belt wheel, a synchronous belt, a large belt wheel, a nut, a screw rod, a connecting rod B, a deep groove ball bearing, a thrust bearing, a ball embedding screw, a reset ejector rod, a reset seat and a reset spring; wherein:
the front end of the small lever is hinged on the front bracket through a fulcrum A, the rear end of the small lever is hinged with the upper end of a connecting rod B, and the lower end of the connecting rod B passes through a through hole in the large lever and is hinged with the screw rod; a large belt wheel, a deep groove ball bearing and a thrust bearing are arranged on a nut which is in threaded fit with the screw rod; a small belt wheel on the stepping motor is in transmission connection with a large belt wheel through a synchronous belt;
a large lever is arranged below the small lever, the rear end of the large lever is hinged on the rear bracket through a fulcrum B, a connecting rod A is hinged between the front end of the large lever and the front end of the small lever, and a force sensor is arranged at the lower part of the front end of the large lever through a force sensor seat;
a ball embedding screw is arranged in the middle of the large lever and tightly propped against the top of the reset ejector rod through a ball body at the lower end part of the ball embedding screw; the outer circle of the reset seat and the outer circle of the reset ejector rod inserted into the center hole of the reset seat are sleeved with a reset spring, and the reset ejector rod can move up and down along the center hole on the reset seat.
The upper end and the lower end of the connecting rod A are respectively hinged in the through holes arranged at the front ends of the small lever and the big lever through rotating shafts.
The middle of the big lever is provided with a threaded hole for installing a ball embedding screw, and the ball embedding screw is locked by a nut.
The lower end part of the ball embedding screw is provided with a pit for embedding and fixing a ball body, and the ball body embedded and fixed in the pit is required to protrude out of the lower end surface of the ball embedding screw.
The reset ejector rod is a T-shaped optical axis, and the top of the reset ejector rod is provided with a circular step.
The reset seat is a step shaft, and the lower end of the reset seat is provided with an annular step and fixed on the base.
The upper end and the lower end of the reset spring are respectively blocked by a circular step surface positioned at the top of the reset ejector rod and an annular step surface at the lower end of the reset seat.
And the upper end of the nut is provided with an external thread matched with the locking nut.
The force sensor penetrates through a through hole formed in the front end of the base.
And the rear end of the base is provided with a through hole for penetrating through the output shaft of the stepping motor and the small belt wheel on the output shaft.
Compared with the prior art, the utility model, have following advantage and positive effect:
the utility model discloses an innovation point is: a large lever is arranged below the small lever, the rear end of the large lever is hinged to the rear support through a fulcrum B, the front end of the large lever is hinged to the front end of the small lever through a connecting rod A, and a force sensor is mounted at the front end of the large lever through a force sensor seat. The connecting rod B hinged at the rear end of the small lever downwards penetrates through the through hole in the large lever and then is hinged with the screw rod; a large belt wheel, a deep groove ball bearing and a thrust bearing are arranged on a nut which is in threaded fit with the screw rod; the stepping motor drives the big belt wheel to rotate through the small belt wheel and the synchronous belt. The lower end ball body of the ball embedding screw fixed in the middle of the large lever is tightly propped against the top of the reset mandril, and the reset seat fixed on the base and the reset mandril inserted and installed in the central hole of the reset seat are sleeved with reset springs.
The utility model has the advantages that can eliminate the phenomenon of the great angle of the skew perpendicular line of the direction of force sensor application, guarantee the accuracy that experimental power was exerted, easily control accuracy, hardness number measurement accuracy is high. When the device works, the stepping motor drives the rear end of the small lever to move downwards, although the small lever swings downwards around the fulcrum shaft A with larger amplitude, because the large lever has longer force arm and shorter downwards moving distance, the downwards moving arc line of the large lever is close to a vertical line, the large lever hinged at the front end of the small lever through the connecting rod A and the force sensor arranged at the front end of the large lever through the force sensor seat are driven to move downwards close to a vertical motion, so that the required applied test force is achieved, the accurate force application of the force sensor is ensured, and the precision of force value measurement and workpiece hardness value measurement is improved.
Drawings
Fig. 1 is a sectional structure view of a durometer double-fulcrum loading and unloading unit.
Description of the components in FIG. 1:
1. a fulcrum A; 2. A connecting rod A; 3. A small lever; 4. a nut; 5. a through hole; 6. a ball screw; 7. resetting the ejector rod; 8. a return spring; 9. a fulcrum B; 10. a stepping motor; 11. a reset seat; 12. a base; 13. a large lever; 14. a force sensor; 15. a force sensor base; 16. a connecting rod B; 17. locking the nut; 18. a screw rod; 19. a nut; 20. a deep groove ball bearing; 21. a thrust bearing; 22. a large belt pulley; 23. a synchronous belt; 24. a small belt wheel.
Detailed Description
The invention will be further explained with reference to the drawings and the detailed description below:
as shown in fig. 1, the two-pivot loading and unloading unit of the durometer of the present invention comprises a pivot a1, a small lever 3, a connecting rod a2, a pivot B9, a large lever 13, a stepping motor 10, a small pulley 24, a synchronous belt 23, a large pulley 22, a nut 19, a lead screw 18, a connecting rod B16, a deep groove ball bearing 20, a thrust bearing 21, a lock nut 17, a force sensor 14, a force sensor seat 15, an embedded ball screw 6, a nut 4, a reset ejector rod 7, a reset seat 11, and a reset spring 8; wherein:
a large lever 13 is provided below the small lever 3, and a through hole 5 for passing the link B16 is provided in the middle of the large lever 13.
The front end of the small lever is hinged on a front bracket through a fulcrum shaft A1, the front bracket is fixed at the front end of the base 12, and the upper end of a connecting rod B16 is hinged in a through hole at the rear end of the small lever; the lower end of the connecting rod B16 passes through the through hole 5 and is hinged with the upper end of the screw rod 18, the screw rod 18 and the screw nut 19 form threaded fit, and the lower end of the screw nut is provided with a deep groove ball bearing 20, a thrust bearing 21 and a large belt wheel 22. The deep groove ball bearing 20 is fitted into a through hole provided in the base 12.
The stepping motor transmission mechanism comprises a stepping motor 10, a small belt wheel 24, a synchronous belt 23, a large belt wheel 22, a screw rod and a nut, wherein the small belt wheel 24 is installed on an output shaft of the stepping motor 10, the small belt wheel 24 is in transmission connection with the large belt wheel 22 installed on the nut 19 through the synchronous belt 23, and the nut 19 is in threaded fit with the screw rod 18 in a center hole of the nut.
The rear end of the large lever is hinged on a rear bracket through a fulcrum B9, the rear bracket is fixed at the rear end of the base 12, and a connecting rod A2 is hinged between the front end of the large lever and the front end of the small lever. Specifically, the front ends of the small lever 3 and the large lever 13 are respectively provided with through holes corresponding to each other up and down, and the upper end and the lower end of the connecting rod a2 are respectively hinged in the through holes arranged at the front ends of the small lever 3 and the large lever 13 through rotating shafts.
A force sensor seat 15 is fixed at the lower part of the front end of the large lever 13, a force sensor 14 is installed on the force sensor seat 15, and the force sensor 14 penetrates through a through hole formed at the front end of the base.
A ball screw 6 is screwed in the middle of the large lever 13 and locked by a nut 4. The lower end part of the ball embedding screw 6 is embedded with a ball body, and the ball embedding screw 6 is tightly propped against the top of the reset ejector rod 7 through the ball body at the lower end part. The reset mandril 7 is a T-shaped optical axis, and the top of the reset mandril is provided with a round step.
The reset seat 11 is a step shaft, and the lower end of the reset seat is fixed on the base 12; a reset mandril 7 which can move up and down is inserted and installed in the central hole of the reset seat 11. An annular step is arranged on the excircle of the lower end of the reset seat 11, and a reset spring 8 is sleeved between the annular step surface and the circular step surface at the top of the reset ejector rod 7.
The return spring 8 functions as: the clearance between the large lever and the connecting piece can be eliminated, so that the reset ejector rod 7 is always tightly pressed on the steel ball at the lower end part of the ball embedding screw 6; the buffer and shockproof function is realized during force application, the slow and stable force application is ensured, and the resetting is facilitated during force unloading.
The utility model discloses the theory of operation of sclerometer double-fulcrum loading and unloading unit is: refer to fig. 1.
A stepping motor 10 in a stepping motor transmission mechanism is positively rotated for loading and reversely rotated for unloading; in the unloading process, the return spring 8 assists to reset. The method comprises the following steps:
(1) the stepping motor 10 is started to rotate forwards, a small belt wheel 24 on the stepping motor drives a large belt wheel 22 on a screw 19 to rotate through a synchronous belt 23, and the screw 19 drives a screw rod 18 to move downwards; when the screw 18 pulls the rear end of the small lever to move downwards around the fulcrum A1 through the connecting rod B16, the front end of the large lever is driven by the connecting rod A2 to move downwards around the fulcrum B9. Meanwhile, the big lever 13 drives the ball body at the lower end part of the ball embedding screw 6 to downwards extrude the top of the reset ejector rod and the reset spring 8, and drives the reset ejector rod 7 to downwards move along the central hole of the reset seat 11.
Because the large lever 13 has a longer force arm and a shorter downward movement distance, the downward movement arc line is close to a vertical line, and the force sensor 14 which is arranged at the front end of the large lever 13 through the force sensor seat 15 is driven to move downwards close to the vertical line, so that the required applied test force is achieved, the slow and stable loading is realized, the measurement accuracy of the test force value is ensured, and the measurement accuracy of the hardness value is further ensured.
(2) The stepping motor 10 is started to rotate reversely, a small belt wheel 24 on the stepping motor drives a large belt wheel 22 on a screw 19 to rotate through a synchronous belt 23, and the screw 19 drives the screw rod 18 to move upwards; when the screw 18 pushes the rear end of the small lever to move upward around the fulcrum A1 through the connecting rod B16, the connecting rod A2 drives the front end of the large lever to move upward around the fulcrum B9. Meanwhile, the reset spring 8 jacks up the reset mandril 7, tightly jacks up the ball body at the lower end part of the ball embedding screw and moves upwards along with the front end of the large lever, and the front end of the large lever moves upwards along with the front end of the small lever through a connecting rod A2.
Because the large lever has a longer force arm and a shorter upward movement distance, the upward movement arc line is close to a vertical line, and the force sensor 14 which is arranged at the front end of the large lever through the force sensor seat 15 is driven to upwards move close to a vertical line, so that the test force applied according to the requirement is discharged, the slow and stable unloading is realized, the measurement accuracy of the test force value is ensured, and the measurement accuracy of the hardness value is further ensured.
Claims (10)
1. A double-fulcrum loading and unloading unit of a hardness tester, which is characterized in that,
the device comprises a fulcrum shaft A, a small lever, a connecting rod A, a fulcrum shaft B, a large lever, a force sensor, a stepping motor, a small belt wheel, a synchronous belt, a large belt wheel, a screw nut, a screw rod, a connecting rod B, a deep groove ball bearing, a thrust bearing, a ball embedding screw, a reset ejector rod, a reset seat and a reset spring; wherein:
the front end of the small lever is hinged on the front bracket through a fulcrum A, the rear end of the small lever is hinged with the upper end of a connecting rod B, and the lower end of the connecting rod B passes through a through hole in the large lever and is hinged with the screw rod; a large belt wheel, a deep groove ball bearing and a thrust bearing are arranged on a nut which is in threaded fit with the screw rod; a small belt wheel on the stepping motor is in transmission connection with a large belt wheel through a synchronous belt;
a large lever is arranged below the small lever, the rear end of the large lever is hinged on the rear bracket through a fulcrum B, a connecting rod A is hinged between the front end of the large lever and the front end of the small lever, and a force sensor is arranged at the lower part of the front end of the large lever through a force sensor seat;
a ball embedding screw is arranged in the middle of the large lever and tightly propped against the top of the reset ejector rod through a ball body at the lower end part of the ball embedding screw; the outer circle of the reset seat and the outer circle of the reset ejector rod inserted into the center hole of the reset seat are sleeved with a reset spring, and the reset ejector rod can move up and down along the center hole on the reset seat.
2. The durometer double-fulcrum loading and unloading unit as claimed in claim 1, wherein the front ends of the small lever and the large lever are provided with through holes corresponding to each other up and down, and the upper end and the lower end of the connecting rod a are respectively hinged to the through holes provided at the front ends of the small lever and the large lever through rotating shafts.
3. The durometer double-fulcrum loading and unloading unit according to claim 1 or 2, wherein a threaded hole for installing a ball-embedded screw is formed in the middle of the large lever, and the ball-embedded screw is locked by a nut.
4. The durometer double-fulcrum loading and unloading unit as claimed in claim 3, wherein a concave pit for embedding and fixing a ball is formed at the lower end of the ball-embedding screw, and the ball embedded and fixed in the concave pit should protrude from the lower end surface of the ball-embedding screw.
5. The durometer double-fulcrum loading and unloading unit as claimed in claim 4, wherein the reset plunger is a T-shaped optical axis with a circular step at the top.
6. The durometer double-fulcrum loading and unloading unit according to claim 5, wherein the reset seat is a stepped shaft, and an annular step is provided at a lower end thereof and fixed to the base.
7. The durometer double-fulcrum loading and unloading unit according to claim 6, wherein the upper and lower ends of the return spring are respectively blocked by a circular step surface at the top of the return ejector rod and an annular step surface at the lower end of the return seat.
8. The durometer double-fulcrum loading and unloading unit according to claim 7, wherein an external thread matched with the locking nut is arranged at the upper end of the nut.
9. The durometer double-fulcrum loading and unloading unit according to claim 8, wherein the force sensor is inserted into a through hole provided at a front end of the base.
10. The durometer double-fulcrum loading and unloading unit of claim 9, wherein the front and rear ends of the base are respectively and fixedly provided with a front bracket and a rear bracket, and the rear end of the base is further provided with a through hole for passing through the output shaft of the stepping motor and the small belt pulley thereon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120279312.6U CN214277761U (en) | 2021-02-01 | 2021-02-01 | Double-fulcrum loading and unloading unit of hardness tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120279312.6U CN214277761U (en) | 2021-02-01 | 2021-02-01 | Double-fulcrum loading and unloading unit of hardness tester |
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| Publication Number | Publication Date |
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| CN214277761U true CN214277761U (en) | 2021-09-24 |
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| CN202120279312.6U Active CN214277761U (en) | 2021-02-01 | 2021-02-01 | Double-fulcrum loading and unloading unit of hardness tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116625862A (en) * | 2023-07-20 | 2023-08-22 | 长垣市建筑工程质量安全服务站 | Concrete member hardness detection device |
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2021
- 2021-02-01 CN CN202120279312.6U patent/CN214277761U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116625862A (en) * | 2023-07-20 | 2023-08-22 | 长垣市建筑工程质量安全服务站 | Concrete member hardness detection device |
| CN116625862B (en) * | 2023-07-20 | 2023-09-26 | 长垣市建筑工程质量安全服务站 | Concrete member hardness detection device |
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