CN218239623U

CN218239623U - Centre gripping extensometer convenient to loading and unloading

Info

Publication number: CN218239623U
Application number: CN202222491675.3U
Authority: CN
Inventors: 张玉明; 李学峰; 赵学峰; 王秀丽; 杭鹰
Original assignee: Jiangsu Province Traffic Engineering Group Bairun Engineering Testing Co ltd
Current assignee: Jiangsu Province Traffic Engineering Group Bairun Engineering Testing Co ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2023-01-06
Anticipated expiration: 2032-09-20

Abstract

The utility model relates to a centre gripping extensometer convenient to loading and unloading, belong to material performance test equipment's technical field, it includes support arm and under bracing arm, the one end of going up support arm and under bracing arm and keeping away from signal converter is connected with the installation piece, it is connected with the edge of a knife to slide on the installation piece, be connected with the fixture that is used for making test piece and edge of a knife support tightly in the installation piece, fixture includes two grip blocks that are cross arrangement, be connected with on the installation piece and be used for supplying grip block pivoted installation axle, the installation axle is located two grip block cross section and is located the edge of a knife and keeps away from the one end of test piece, it is used for driving two grip blocks to be close to the one end of the edge of a knife and rotates to the installation elastic component that is close to each other to install epaxial being connected with, be equipped with two grip blocks of remote control on the installation piece and rotate the control assembly that keeps away from each other to the one end that is close to the edge of a knife. The clamping extensometer has the effect that an operator can safely and rapidly take down the clamping extensometer at a certain distance.

Description

Centre gripping extensometer convenient to loading and unloading

Technical Field

The utility model belongs to the technical field of the technique of material performance test equipment and specifically relates to a centre gripping extensometer convenient to loading and unloading is related to.

Background

In a strand tensile test or a bar tensile test, the elongation of a strand or bar is often measured by clamping a extensometer. The centre gripping extensometer includes the support arm, lower support arm and signal converter, it is connected with the edge of a knife all to slide on support arm and the lower support arm to go up the support arm and the lower support arm is kept away from the one end of edge of a knife and is fixed with signal converter, the edge of a knife is connected with signal converter, in the actual operation in-process, it is fixed with the edge of a knife that the test piece passes through spring clamp or rubber band, drive when the test piece is tensile and slide with the edge of a knife that the test piece supports tightly, open displacement volume can transmit to signal converter between two edges of a knife in, the elongation of test piece is promptly for open displacement volume between two edges of a knife.

Need take off the centre gripping extensometer fast among the prior art after the test piece is tensile to the yield point, be difficult for appearing the reinforcing bar damage and cause the condition that the centre gripping extensometer damaged, if the test piece quality is not good, breaking when getting the centre gripping extensometer, can bring certain danger to the operator.

SUMMERY OF THE UTILITY MODEL

In order to enable an operator to safely and quickly remove the clamping extensometer from a certain distance, the application provides the clamping extensometer which is convenient to assemble and disassemble.

The application provides a pair of centre gripping extensometer convenient to loading and unloading adopts following technical scheme:

the utility model provides a centre gripping extensometer convenient to loading and unloading, includes support arm and lower support arm, the one end of going up support arm and lower support arm and keeping away from signal converter all is connected with the installation piece, it has the edge of a knife to slide on the installation piece to be connected with, be connected with on the installation piece and be used for making test piece and edge of a knife support fixture tight, fixture includes two grip blocks that are cross arrangement, be connected with on the installation piece and be used for supplying grip block pivoted installation axle, the installation axle is located two grip block intersections and is located the edge of a knife and keeps away from the one end of test piece, install epaxial being connected with and being used for driving two grip blocks and being close to the installation elastic component that the one end of edge of a knife was close to each other, be equipped with the control assembly that two grip blocks of remote control were close to the edge of a knife and keep away from each other on the installation piece.

By adopting the technical scheme, the test piece is tightly abutted against the knife edges through the clamping mechanism, corresponding displacement is generated between the knife edges when the test piece is stretched, and the expanded displacement between the two knife edges can be transmitted into the signal converter; under the action of the two clamping blocks, the elastic mounting element and the mounting shaft, the ends of the two clamping blocks, which are close to the knife edge, rotate to be tightly abutted to the test piece under the elastic action of the elastic mounting element, and the test piece is tightly abutted to the knife edge.

Preferably, the control assembly includes the control block that sliding arrangement in the installation piece, offer the control groove that is used for supplying the grip block to keep away from the one end of edge of a knife and slides on the control block, be connected with two control axles on the inner wall of control groove, two the control axle is close to the laminating of one side of control groove inner wall with two grip blocks respectively, the one end that the edge of a knife was kept away from to the control block is connected with and is used for driving the control block towards the stay cord of keeping away from the direction of edge of a knife and sliding, the one end that the control block was kept away from to the stay cord extends to outside the installation piece, the one end that two grip blocks of drive were close to the edge of a knife when the control block slided is kept away from each other.

Through adopting above-mentioned technical scheme, the one end that the edge of a knife was kept away from to two grip blocks is slided and is set up in the control groove on the control block, the distance between two control shafts of connecting on the control groove inner wall is unchangeable, two control shafts are close to one side laminating of control groove inner wall with two grip blocks respectively, the outer stay cord of pulling installation piece, the control block slides towards the direction of keeping away from the edge of a knife under the pulling force effect, two grip blocks rotate and the grip block keeps away from the one end of edge of a knife and is close to each other under the effect of control shaft, the one end that two grip blocks are close to the edge of a knife separates with the test piece, control two stay cords simultaneously, can take off the centre gripping extensometer safely rapidly.

Preferably, it is connected with the gear to rotate on the inner wall of control groove, the gear is located between two control axles, be connected with on the control axle with gear engagement's rack, two rack on the control axle sets up in the gear both sides relatively, be equipped with on the control block and be used for locking gear revolve's locking piece.

Through adopting above-mentioned technical scheme, under the cooperation of gear and rack, but the slippage of two control shafts of synchro control in the control flume, and the length that slides is the same, be convenient for the slippage of synchro control shaft in the control flume, through the setting of locking piece, the rotation of locking gear, thereby the slippage of locking control shaft in the control flume, the control shaft slips in the control flume when the difficult control block that appears slides, cause the difficult condition with the test piece separation of grip block, hoisting device's reliability.

Preferably, the locking piece includes and rotates the drive shaft of being connected with the control block, the gear is coaxial setting with the drive shaft, the one end that the gear was kept away from to the drive shaft slides and is connected with the locking axle, the locking axle slides along the length direction of drive shaft, the one end that the drive shaft was kept away from to the locking axle extends to outside the control block, the one end that the drive shaft was kept away from to the locking axle is connected with the locking piece, a plurality of locking grooves have been seted up on the terminal surface of control block, locking piece embedding arbitrary one locking inslot after the locking axle rotated.

Through adopting above-mentioned technical scheme, under the cooperation of locking axle, locking piece and locking groove, be convenient for control and gear connection's the rotation and the locking of drive shaft, the control shaft slips in the control slot when being difficult for appearing the control block and slide, causes the difficult condition with the test piece separation of grip block, hoisting device's reliability.

Preferably, the control block is connected with two sliding blocks, the two sliding blocks are arranged in the control groove in a sliding mode, the control shaft is arranged on the sliding blocks in a rotating mode, and the rack is located on the sliding blocks.

By adopting the technical scheme, the control shaft is rotationally arranged in the control groove by the arrangement of the sliding block, so that the friction between the control shaft and the clamping block when the control block slides is reduced, and the sliding of the control shaft is facilitated.

Preferably, the upper supporting arm and the lower supporting arm are connected with a plurality of positioning pieces used for limiting the sliding track of the pull ropes, the upper supporting arm is connected with a limiting ring, and the two ends of the pull ropes far away from the control block are connected with the limiting ring.

Through adopting above-mentioned technical scheme, the spacer is used for restricting the orbit of sliding of stay cord, and two stay cords are connected on same spacing ring, and the accessible pulling spacing ring is controlled two control blocks and is slided, has improved the loading and unloading speed of centre gripping extensometer.

Preferably, the control block is connected with a control elastic element for driving the control block to slide towards the knife edge.

By adopting the technical scheme, after the control block is driven to slide by the pull rope, the pull rope is loosened, the control block slides towards the knife edge under the elastic action of the control elastic part, the control block slides towards the direction away from the knife edge in the experimental process, so that the test piece is not attached to the knife edge, the test data is mistaken, and the reliability of the test data is improved.

Preferably, a plurality of bumps are arranged on the end face of the clamping block, which is attached to the test piece.

By adopting the technical scheme, the friction between the clamping block and the test piece is increased through the arrangement of the convex block, so that the test piece is clamped by the clamping block and then is tightly abutted against the knife edge.

Preferably, the control block is connected with a guide block, and the mounting block is provided with a guide groove for the guide block to slide.

Through adopting above-mentioned technical scheme, through the setting of guide block, the orbit of sliding of restriction control block, when difficult appearance slided through stay cord drive control block, the control block drove the clamping block pivoted condition in the control flume, improved device's reliability.

In summary, the present application includes at least one of the following beneficial technical effects:

1. under the action of the two clamping blocks, the mounting elastic piece and the mounting shaft, under the elastic action of the mounting elastic piece, one ends of the two clamping blocks, which are rotated to be close to the knife edge, are abutted against the test piece, and the test piece is abutted against the knife edge;

2. the pull rope outside the pulling installation block, the control block slides towards the direction of keeping away from the edge of a knife under the tensile force effect, the one end that the edge of a knife was kept away from to two grip blocks rotates and is close to each other under the effect of control shaft, and the one end that two grip blocks are close to the edge of a knife separates with the test piece, controls two pull ropes simultaneously, can take off the centre gripping extensometer safely rapidly.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.

Fig. 2 is a schematic view of a mounting block decapping structure in an embodiment of the present application.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Fig. 4 is a schematic view of another angle overall structure in the embodiment of the present application.

Fig. 5 is a schematic structural diagram of a control block in the embodiment of the present application.

Fig. 6 is an enlarged view of a portion B in fig. 5.

Description of the reference numerals: 1. clamping the extensometer; 11. an upper support arm; 111. positioning a sheet; 112. a limiting ring; 12. a lower support arm; 13. a signal converter; 2. mounting blocks; 21. a knife edge; 22. a clamping block; 221. a bump; 222. clamping the through hole; 23. installing a shaft; 231. a torsion spring; 24. a guide groove; 25. mounting grooves; 251. a top cover; 3. a control block; 31. a control slot; 32. a control shaft; 321. a sliding block; 322. a rack; 33. pulling a rope; 34. a spring; 35. a guide block; 36. a gear; 37. a drive shaft; 371. a limiting groove; 38. a lock shaft; 381. a limiting block; 382. a locking block; 39. and locking the grooves.

Detailed Description

The present invention is described in further detail below with reference to fig. 1-6.

The embodiment of the application discloses centre gripping extensometer convenient to loading and unloading, refer to fig. 1 and fig. 2, including last supporting arm 11, lower support arm 12 and signal converter 13, it is fixed with signal converter 13 to go up supporting arm 11 and lower support arm 12, it is fixed with installation piece 2 respectively to go up the one end that signal converter 13 was kept away from to supporting arm 11 and lower support arm 12, it is connected with edge of a knife 21 to slide on installation piece 2, edge of a knife 21 is perpendicular to installation piece 2's direction of height setting, edge of a knife 21 slides along installation piece 2's direction of height.

Referring to fig. 2, a clamping mechanism for enabling the test piece to be tightly abutted against the knife edge 21 is arranged in the mounting block 2, the clamping mechanism comprises two clamping blocks 22 which are arranged in a crossed manner, a plurality of convex blocks 221 are arranged on the end faces, attached to the test piece, of the clamping blocks 22, and friction between the clamping blocks 22 and the test piece is increased through the arrangement of the convex blocks 221; the knife edge 21 connected with the mounting block 2 on the upper support arm 11 is positioned above the clamping block 22, and the knife edge 21 connected with the mounting block 2 on the lower support arm 12 is positioned below the clamping block 22.

Referring to fig. 2 and 3, a clamping through hole 222 for another clamping block 22 to penetrate is formed in the middle of any one clamping block 22, the mounting block 2 is fixedly connected with a mounting shaft 23 for the clamping block 22 to rotate, the mounting shaft 23 is located at the intersection of the two clamping blocks 22 and is located at one end of the knife edge 21 far away from the test piece, the mounting shaft 23 is arranged along the height direction of the mounting block 2, an installation elastic member for driving one ends of the two clamping blocks 22 close to the knife edge 21 to be close to each other is arranged on the mounting shaft 23, in the embodiment of the application, the installation elastic member selects the torsion spring 231, the torsion spring 231 is sleeved on the mounting shaft 23, and two ends of the torsion spring 231 are respectively abutted against the two clamping blocks 22.

Referring to fig. 4 and 5, in order to remotely control the ends, close to the knife edge 21, of the two clamping blocks 22 to be away from each other, a control assembly is arranged on the mounting block 2, the control assembly includes a control block 3 which is arranged in the mounting block 2 in a sliding manner, the control block 3 slides in a direction perpendicular to the height direction of the mounting block 2, a control groove 31 for allowing the end, close to the knife edge 21, of the clamping block 22 to slide is formed in the control block 3, two control shafts 32 are rotatably connected to the inner wall of the control groove 31, the control shafts 32 are arranged in the height direction of the mounting block 2, and the two control shafts 32 are respectively attached to the ends, close to the inner wall of the control groove 31, of the two clamping blocks 22.

Referring to fig. 4, one end of the control block 3, which is far away from the knife edge 21, is fixedly connected with a pull rope 33 for driving the control block 3 to slide towards a direction far away from the knife edge 21, one end of the pull rope 33, which is far away from the control block 3, extends to the outside of the mounting block 2, a plurality of positioning pieces 111 for limiting sliding tracks of the pull rope 33 are fixedly connected to the upper support arm 11 and the lower support arm 12, the positioning pieces 111 are arranged along the side wall of the upper support arm 11, the positioning pieces 111 are arranged in an arc shape, a limit ring 112 is arranged on the upper support arm 11, and one ends of the two pull ropes 33, which are far away from the control block 3, are fixed with the limit ring 112.

Referring to fig. 2, one end of the control block 3 away from the knife edge 21 is fixedly connected with a control elastic member for driving the control block 3 to slide toward the knife edge 21, in the embodiment of the present application, the control elastic member is a spring 34, one end of the spring 34 is fixed to the control block 3, the other end of the spring 34 is fixed to the mounting block 2, and the spring 34 is sleeved on the pull rope 33.

Referring to fig. 2 and 5, in order to make the sliding of the control block 3 more stable, a guide block 35 is fixedly connected to the control block 3, the guide block 35 is arranged perpendicular to the height direction of the mounting block 2, and a guide groove 24 for allowing the guide block 35 to slide is formed in the mounting block 2.

When the clamping extensometer 1 is installed on a test piece, the limiting ring 112 is pulled towards the direction far away from the upper supporting arm 11, the control block 3 slides towards the direction far away from the knife edge 21 under the action of the pulling force of the pulling rope 33, when the control block 3 slides, one ends, close to the knife edge 21, of the two clamping blocks 22 are driven to be far away from each other, the limiting ring 112 is loosened after the knife edge 21 and the test piece are tightly abutted, the control block 3 slides towards the knife edge 21 under the action of the elastic force of the spring 34, and the two clamping blocks 22 rotate to one ends, close to the knife edge 21, and are tightly abutted to the test piece.

When the test piece is stretched to the yield point, the limiting ring 112 is pulled towards the direction far away from the upper supporting arm 11, the control block 3 slides towards the direction far away from the knife edge 21 under the action of the pulling force of the pulling rope 33, the two clamping blocks 22 are driven to rotate to be separated from the test piece when the control block 3 slides, and the two clamping blocks 22 move to clamp the extensometer 1 towards the direction far away from the test piece after being completely separated from the test piece.

Referring to fig. 5 and 6, in order to adapt the control block 3 to different clamping blocks 22, two sliding blocks 321 are connected in the control block 3 in a sliding manner, the sliding blocks 321 slide in a direction perpendicular to the sliding direction of the control block 3, the control shafts 32 are rotatably arranged on the sliding blocks 321, the inner walls of the control grooves 31 are rotatably connected with gears 36, the gears 36 are located between the two control shafts 32, racks 322 meshed with the gears 36 are fixedly connected to the sliding blocks 321, the racks 322 on the two sliding blocks 321 are oppositely arranged on two sides of the gears 36, and under the meshing cooperation of the gears 36 and the racks 322, the sliding of the two control shafts 32 can be synchronously controlled, and the sliding distances are the same.

Referring to fig. 5 and 6, in order to lock the rotation of the gear 36, a locking piece is arranged on the control block 3, the locking piece includes a driving shaft 37 rotatably connected with the control block 3, the driving shaft 37 is arranged along the height direction of the mounting block 2, the driving shaft 37 and the gear 36 are coaxially fixed, one end of the driving shaft 37, which is far away from the gear 36, is slidably connected with a locking shaft 38, the locking shaft 38 is arranged along the length direction of the driving shaft 37 and is slidably connected along the length direction of the driving shaft 37, a limiting block 381 is fixedly connected on the peripheral wall of the locking shaft 38, a limiting groove 371 is formed in the driving shaft 37, which is used for allowing the locking shaft 38 and the limiting block 381 to slidably move, one section of the locking shaft 38, which is far away from the driving shaft 37, extends to the outside of the control block 3, a locking block 382 is fixedly connected on the peripheral wall of one end of the locking shaft 38, which is far away from the driving shaft 37, and a plurality of locking grooves 39 for allowing the locking block 382 to be embedded are formed in the end face of the control block 3, in this embodiment, eight locking grooves 39 are arranged in a circumferential array, and after the locking blocks 382 are embedded in the locking grooves 39, the end faces of the locking block 382 and the locking block 382 are flush with the end faces of the locking block 382; in order to adjust the position of the control shaft 32 in the control block 3, a mounting groove 25 for placing the clamping block 22 and the control block 3 is opened on the mounting block 2, and a top cover 251 for closing the mounting groove 25 is slidably arranged at the top end of the mounting block 2.

When the distance between the control shafts 32 is adjusted according to the distance between the ends of the two clamping blocks 22 far away from the knife edge 21, the top cover 251 is slid to separate the top cover 251 from the mounting block 2, the locking shaft 38 is slid to the locking block 382 to slide out of the locking groove 39 by an auxiliary tool, the locking shaft 38 is rotated, the driving shaft 37 and the gear 36 fixed with the driving shaft 37 are driven to rotate by the limiting block 381 when the locking shaft 38 is rotated, the control shaft 32 is slid in the control groove 31 under the engagement of the gear 36 and the rack 322, after the control shaft 32 is adjusted to the position matched with the two clamping blocks 22, the locking shaft 38 is slid to the driving shaft 37, the locking block 382 is embedded into the nearest locking groove 39, and the top cover 251 is remounted on the mounting block 2.

The implementation principle of centre gripping extensometer convenient to loading and unloading of this application embodiment does: firstly, the distance between the control shafts 32 is adjusted according to the opening distance of one ends of the two clamping blocks 22 far away from the knife edge 21, the top cover 251 is slid to separate the top cover 251 from the mounting block 2, the locking shaft 38 is slid to the locking block 382 from the locking groove 39 in the direction far away from the driving shaft 37 by an auxiliary tool, the locking shaft 38 is rotated, the position of the control shaft 32 is adjusted to be matched with the two clamping blocks 22, the locking shaft 38 is slid to the driving shaft 37, the locking block 382 is embedded into the nearest locking groove 39, and the top cover 251 is installed on the mounting block 2 again.

When the clamping extensometer 1 is installed on a test piece, the limiting ring 112 is pulled towards the direction far away from the upper supporting arm 11, the limiting ring 112 is loosened after the knife edge 21 is tightly abutted to the test piece, the control block 3 slides towards the knife edge 21 under the elastic force action of the spring 34, and the two clamping blocks 22 rotate to one end close to the knife edge 21 and tightly abut to the test piece.

When the test piece is stretched to the yield point, the limiting ring 112 is pulled towards the direction far away from the upper supporting arm 11, the two clamping blocks 22 are driven to rotate to be separated from the test piece when the control block 3 slides, and the clamping extensometer 1 is moved towards the direction far away from the test piece when the two clamping blocks 22 are completely separated from the test piece.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a centre gripping extensometer convenient to loading and unloading, includes support arm (11) and lower support arm (12), its characterized in that: go up support arm (11) and lower support arm (12) and keep away from the one end of signal converter (13) and all be connected with installation piece (2), it has edge of a knife (21) to slide on installation piece (2), be connected with on installation piece (2) and be used for making test piece and edge of a knife (21) support tight fixture, fixture includes two grip blocks (22) that are cross arrangement, be connected with on installation piece (2) and be used for supplying grip block (22) pivoted installation axle (23), installation axle (23) are located two grip blocks (22) cross section and are located edge of a knife (21) and keep away from the one end of test piece, be connected with on installation axle (23) and be used for driving the installation elastic component that the one end that two grip blocks (22) of remote control are close to edge of a knife (21) is close to each other, be equipped with the control assembly that one end that two grip blocks (22) of remote control are close to edge of a knife (21) on installation piece (2) kept away from each other.

2. A grip extensometer as claimed in claim 1 which is readily accessible by: the control assembly sets up control block (3) in installation piece (2) including sliding, offer on control block (3) and be used for supplying grip block (22) to keep away from control groove (31) that the one end of edge of a knife (21) slided, be connected with two control axles (32) on the inner wall of control groove (31), two control axle (32) laminate with one side that two grip block (22) are close to control groove (31) inner wall respectively, the one end that edge of a knife (21) were kept away from in control block (3) is connected with stay cord (33) that are used for driving control block (3) and slide towards the direction of keeping away from edge of a knife (21), the one end that control block (3) were kept away from in stay cord (33) extends to outside installation piece (2), the one end that two grip block (22) of drive were close to edge of a knife (21) when control block (3) slided keeps away from each other.

3. A grip extensometer as claimed in claim 2 which is easy to handle and which is characterized by: rotate on the inner wall of control groove (31) and be connected with gear (36), gear (36) are located between two control shafts (32), be connected with on control shaft (32) with gear (36) meshing rack (322), two rack (322) on control shaft (32) set up in gear (36) both sides relatively, be equipped with on control block (3) and be used for locking gear (36) pivoted locking piece.

4. A readily removable grip extensometer as claimed in claim 3 wherein: the locking piece includes drive shaft (37) of being connected with control block (3) rotation, gear (36) are coaxial setting with drive shaft (37), the one end that gear (36) were kept away from in drive shaft (37) slides and is connected with locking axle (38), the length direction that drive shaft (37) were followed in locking axle (38) slides, the one end that drive shaft (37) were kept away from in locking axle (38) extends to outside control block (3), the one end that drive shaft (37) were kept away from in locking axle (38) is connected with locking piece (382), a plurality of locking grooves (39) have been seted up on the terminal surface of control block (3), locking piece (382) embedding arbitrary one locking groove (39) after locking axle (38) rotated.

5. A grip extensometer convenient to handle as claimed in claim 3 or 4, characterized in that: the control block (3) is connected with two sliding blocks (321), the two sliding blocks (321) are arranged in the control groove (31) in a sliding mode, the control shaft (32) is arranged on the sliding blocks (321) in a rotating mode, and the rack (322) is located on the sliding blocks (321).

6. A grip extensometer as claimed in claim 4 which is easy to handle and characterized in that: go up and be connected with a plurality of spacers (111) that are used for restricting stay cord (33) orbit of sliding on supporting arm (11) and lower support arm (12), go up and be connected with spacing ring (112) on supporting arm (11), two the one end that control block (3) were kept away from in stay cord (33) is connected with spacing ring (112).

7. A readily removable grip extensometer as claimed in claim 5 wherein: the control block (3) is connected with a control elastic piece for driving the control block (3) to slide towards the knife edge (21).

8. A readily removable grip extensometer as claimed in claim 1 wherein: and a plurality of convex blocks (221) are arranged on the end surface of the clamping block (22) attached to the test piece.

9. A grip extensometer as claimed in claim 2 which is easy to handle and which is characterized by: the guide block (35) is connected to the control block (3), and a guide groove (24) for the guide block (35) to slide is formed in the mounting block (2).