Large deformation extensometer

Abstract

The utility model relates to a large deformation extensometer, comprising a base, a top seat and a guide rod vertically connected between the base and the top seat, the base is rotatably provided with a counterweight wheel and a lower steering wheel through a support, and the counterweight wheel and the lower steering wheel are located on the same axis. Two upper steering wheels which are located on the same axis and correspond to the balance weight wheel and the lower steering wheels are rotationally installed on the top base through a support, an absolute value encoder is further installed on the top base and located above the upper steering wheels through a support, an encoder wheel is rotationally installed on the absolute value encoder, and the axis of the encoder wheel is perpendicular to the axis of the upper steering wheels in a different-plane mode. An upper clamp body and a lower clamp body are arranged on the guide rod in a sliding mode through linear bearings respectively, the upper clamp body and the lower clamp body are connected to the two ends of the same pull rope respectively, and the pull rope is wound around the lower steering wheel, the balance weight wheel, the upper steering wheel and the encoder wheel respectively. According to the utility model, the continuous measurement in a large deformation range can be realized, the stability is good, and the jumper derailment phenomenon is solved through the cooperation of the outer wire wheel check ring.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring equipment, and particularly relates to a large deformation extensometer. Background Art

[0002] The existing large deformation electronic extensometers have poor accuracy and stability in large deformation measurement. Especially, jumper derailment often occurs during measurement, and the existing technologies are difficult to meet the requirements of accurate measurement. Therefore, it is of important practical application value to develop a large deformation electronic extensometer with high precision and high stability. Summary of the Utility Model

[0003] Aiming at the deficiencies of the existing technologies, the utility model provides a large deformation extensometer with good stability, which solves the problem of jumper derailment through the cooperation of an outer wire wheel retaining ring.

[0004] The utility model is realized through the following technical solutions:

[0005] Provide a large deformation extensometer, including a base, a top seat, and a guide rod vertically connected between the base and the top seat. A counterweight wheel and a lower steering wheel located on the same axis are rotatably installed on the base through brackets. Two upper steering wheels located on the same axis and corresponding to the counterweight wheel and the lower steering wheel are rotatably installed on the top seat through brackets. An absolute encoder is also installed above the upper steering wheel on the top seat through a bracket. An encoder wheel is rotatably installed on the absolute encoder. The axis of the encoder wheel is skew perpendicular to the axis of the upper steering wheel. An upper clamp body and a lower clamp body are respectively slidably arranged on the guide rod through linear bearings. The upper clamp body and the lower clamp body are respectively connected to both ends of the same stay wire. The stay wire is respectively wound between the lower steering wheel, the counterweight wheel, the upper steering wheel, and the encoder wheel.

[0006] Further, the clamp body includes a transverse base. One end of the transverse base is connected to the linear bearing. The other end of the transverse base is slidably connected with a sliding clamp seat. Two guide pins arranged horizontally up and down are vertically connected to the upper end of the vertical surface of the sliding clamp seat. A movable clamp seat arranged opposite to the sliding clamp seat is slidably connected to the two guide pins. A screw rod located between the two guide pins is threadedly connected to the movable clamp seat. The other end of the screw rod movably penetrates through the sliding clamp seat and is provided with a limit block. A spring is sleeved between the limit block and the sliding clamp seat on the screw rod.

[0007] The clamp body passes through the sliding clamp seat and the movable clamp seat arranged in cooperation on the transverse base. The movable clamp seat is slidably arranged on the movable pin. The elastic force of the spring is used to push the sliding clamp seat and the movable clamp seat to approach each other to clamp an object. The screw rod is threadedly connected to the movable clamp seat and is used to adjust the compression amount of the spring, and further adjust the magnitude of the spring elastic force to adjust an appropriate clamping force to adapt to different objects for use.

[0008] Further, one end of the cable is connected to the upper clamping body. The other end of the cable winds upward around an upper turning wheel on the top seat, then changes direction downward and winds around a lower turning wheel on the base seat, then changes direction upward and winds around an encoder wheel, then changes direction downward and winds around a counterweight wheel on the base seat, then changes direction upward and winds around another upper turning wheel on the top seat, and finally changes direction downward and is connected to the lower clamping body.

[0009] The cable passes through the upper turning wheel, the lower turning wheel, the encoder wheel, the base counterweight wheel, and the upper turning wheel in sequence, achieving direction change and connection with the encoder wheel, which facilitates the encoder to read the displacement.

[0010] Further, a plurality of through holes for the cable to pass through are correspondingly provided on the top seat.

[0011] The through holes provided on the top seat facilitate the passage of the cable, ensuring the smooth movement of the cable.

[0012] Further, fixture blades for clamping objects are respectively provided at the bottoms of the clamping surfaces of the sliding clamp seat and the movable clamp seat facing each other.

[0013] By providing fixture blades on the clamping surfaces of the two clamp seats for clamping objects, the clamping stability is ensured.

[0014] Preferably, the lower turning wheel and the counterweight wheel on the base seat are both covered with wheel covers connected to the bracket, and the upper turning wheel on the top seat is also covered with a wheel cover connected to the bracket. Two through holes for the cable to pass through are correspondingly provided on each wheel cover.

[0015] By covering the lower turning wheel and the counterweight wheel with wheel covers, the cable can be limited by the through holes on the wheel covers, effectively preventing the cable from jumping out of the track.

[0016] Further, a protective cover is formed between the base seat and the top seat on one side of the guide rod, covering the cable, the upper bracket on the base seat, the lower turning wheel, and the counterweight wheel.

[0017] The protective cover can cover the cable, the turning wheel, and the counterweight wheel, isolating them from the outside world and preventing dust adhesion from affecting the smooth rotation.

[0018] Further, a top cover is covered and installed on the top seat, and an upper end cover is installed on the upper surface of the top cover.

[0019] The top cover covers the encoder, the encoder wheel, and the upper turning wheel on the top seat, isolating them from the outside world and preventing dust from entering and affecting the smooth rotation. The upper end cover can be designed to be openable and closable, facilitating the debugging of the encoder.

[0020] The beneficial effects of the present utility model:

[0021] The utility model improves the measurement accuracy and stability of large deformation displacement. Through the coordinated multi-line winding of the wire rope and the steering wheels, it realizes rapid continuous measurement within the full scale, full size, arbitrary position range, and large deformation range. It has good environmental adaptability and can work in extreme environments. It has good stability. The counterweight wheel and the lower steering wheel are covered with wheel covers, and the wire rope is limited through perforations to solve the problems of jumper derailment and improve the measurement stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0023] Figure 2 It is a schematic diagram of the structure on the top seat of the utility model.

[0024] Figure 3 It is a schematic diagram of the structure of the fixture body of the utility model.

[0025] Figure 4 It is a schematic diagram of the structure of the counterweight wheel and the lower steering wheel on the base of the utility model.

[0026] Figure 5 It is a schematic diagram of the winding of the wire rope in the utility model.

[0027] As shown in the figure:

[0028] 1. Base, 2. Top seat, 3. Guide rod, 4. Protective cover, 5. Top cover, 6. Upper end cover, 7. Absolute encoder, 8. Encoder wheel, 9. Counterweight wheel, 10. Bracket, 11. Linear bearing, 12. Upper fixture body, 13. Knurled handwheel, 14. Wire rope, 15. Guide pin shaft, 16. Spring, 17. Fixture blade, 18. Upper steering wheel, 19. Wheel cover, 20. Horizontal base, 21. Sliding clamp seat, 22. Movable clamp seat, 23. Screw, 24. Fixture blade, 25. Lower steering wheel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] To clearly illustrate the technical features of this solution, the following elaborates on this solution through specific embodiments.

[0030] A large-deformation extensometer, comprising a base 1, a top seat 2, and a guide rod 3 vertically connected between the base 1 and the top seat 2. On the base 1, a counterweight wheel 9 and a lower steering wheel 25 located on the same axis are rotatably installed through a bracket 10. On the top seat 2, two upper steering wheels 18 located on the same axis and corresponding to the counterweight wheel 9 and the lower steering wheel 25 are rotatably installed through a bracket. On the top seat 5, an absolute encoder 7 is further installed above the upper steering wheel 18 through a bracket. An encoder wheel 8 is rotatably installed on the absolute encoder 7. The axis of the encoder wheel 8 is skew perpendicular to the axis of the upper steering wheel 18. On the guide rod 3, an upper clamp body 12 and a lower clamp body are respectively slidably arranged through linear bearings 11. The upper clamp body 12 and the lower clamp body are respectively connected to both ends of the same wire rope 14. The wire rope 14 is respectively wound between the lower steering wheel 25, the counterweight wheel 9, the upper steering wheel 18, and the encoder wheel 8. A protective cover 4 is formed between the base 1 and the top seat 2 on one side of the guide rod, which covers the wire rope 14, the bracket 10 on the base 1, the lower steering wheel 25, and the counterweight wheel 9. A top cover 5 is installed on the top seat 2 in a covering manner, and an upper end cover 6 is installed on the upper surface of the top cover 5.

[0031] The clamp body includes a transverse base 20. One end of the transverse base 20 is connected to the linear bearing 11. The other end of the transverse base 20 is slidably connected with a sliding clamp seat 21. Vertically connected to the upper end of the vertical surface of the sliding clamp seat 21 are two guide pin shafts 15 arranged horizontally up and down. And a movable clamp seat 22 arranged opposite to the sliding clamp seat 21 is slidably connected on the two guide pin shafts 15. Clamping blades 24 for clamping an object are respectively arranged at the bottoms of the mutually opposite clamping surfaces of the sliding clamp seat 21 and the movable clamp seat 22. A screw rod 23 located between the two guide pin shafts 15 is threadedly connected to the upper part of the movable clamp seat 22. The other end of the screw rod 23 movably penetrates through the sliding clamp seat 21 and is provided with a limit block. A spring 16 is sleeved on the screw rod 23 between the limit block and the sliding clamp seat 21. A knurled hand wheel 13 is installed at the end of the screw rod 23, which is convenient for rotating the screw rod 23.

[0032] A plurality of through holes for the wire rope 14 to penetrate through are correspondingly opened on the top seat 2. One end of the wire rope 14 is connected to the upper clamp body 12. The other end of the wire rope 14 is wound upward around an upper steering wheel 18 of the top seat 2, then redirected downward around the lower steering wheel 25 on the base 1, then redirected upward around the encoder wheel 8, then redirected downward around the counterweight wheel 9 on the base 1, then redirected upward around the other upper steering wheel 18 of the top seat 2, and finally redirected downward to be connected to the lower clamp body.

[0033] Wheel covers 19 connected to the bracket 10 are respectively sleeved outside the lower steering wheel 25 and the counterweight wheel 9 on the base 1. Wheel covers 19 connected to the bracket are also sleeved outside the upper steering wheels 18 of the top seat 2. Two through holes for the wire rope 14 to pass through are correspondingly opened on each wheel cover 19.

[0034] The utility model drives the clamping blades of the sliding clamp seat 21 and the clamping blades 24 of the movable clamp seat 22 to perform a clamping action by rotating the knurled handwheel 13. The spring will push the sliding clamp seat 21 to slide on the guiding pin shaft 15 to achieve firm clamping. When the specimen is stretched, the clamp body will displace, and the wire rope 14 will drive the upper steering wheel 18, the lower steering wheel 25, etc. to rotate. When the relative distance between the upper and lower clamp bodies increases, the value increases; when the relative distance decreases, the data decreases.

[0035] The length of the guiding rod 3 determines the maximum distance and stroke between the base 1 and the top seat 2. The counterweight wheel 9 maintains the balance force of the clamp. The displacement distance between the upper and lower clamp bodies drives the wire rope 14, and the wire rope 14 pulls the encoder wheel 8 to rotate, so as to obtain the required displacement data.

[0036] The utility model can be widely applied to the tensile tests of rubber, plastic, plastic, film, textile, fiber, nanomaterial, polymer material, chemical coating composite material, packing belt, paper, wire and cable, optical fiber cable, safety belt, leather belt, footwear, adhesive tape, polymer, elongation rate, etc.

[0037] Certainly, the above description is not limited to the above examples. The technical features not described in the utility model can be realized by or adopted the prior art, and will not be elaborated here. The above embodiments and drawings are only used to illustrate the technical solutions of the utility model and are not a limitation to the utility model. The utility model has been described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that any changes, modifications, additions or substitutions made by those of ordinary skill in the art within the essence scope of the utility model do not depart from the purpose of the utility model and should also belong to the protection scope of the claims of the utility model.

Claims

1. A large deformation extensometer, characterized in that: It includes a base, a top seat and a guide rod vertically connected between the base and the top seat, a counterweight wheel and a lower steering wheel located on the same axis are rotatably installed on the base through a bracket, two upper steering wheels located on the same axis and corresponding to the counterweight wheel and the lower steering wheel are rotatably installed on the top seat through a bracket, an absolute value encoder is also installed above the upper steering wheel on the top seat through a bracket, an encoder wheel is rotatably installed on the absolute value encoder, the axis of the encoder wheel is skewed and perpendicular to the axis of the upper steering wheel, an upper clamping concrete and a lower clamping concrete are respectively slidably provided on the guide rod through linear bearings, the upper clamping concrete and the lower clamping concrete are respectively connected to two ends of the same pull rope, and the pull rope is respectively wound around the lower steering wheel, the counterweight wheel, the upper steering wheel and the encoder wheel.

2. The large deformation extensometer according to claim 1, characterized in that: The clamp body includes a transverse base, one end of the transverse base is connected to the linear bearing, the other end of the transverse base is slidably connected to a sliding clamp seat, the upper end of the vertical surface of the sliding clamp seat is vertically connected to two guide pin shafts arranged horizontally up and down, and a movable clamp seat arranged opposite to the sliding clamp seat is slidably connected on the two guide pin shafts, the movable clamp seat is threadedly connected to a screw located between the two guide pin shafts, the other end of the screw movably passes through the sliding clamp seat and is provided with a limit block, and a spring is sleeved on the screw between the limit block and the sliding clamp seat.

3. The large deformation extensometer according to claim 1, characterized in that: One end of the pull rope is specifically connected to the upper clamp, and the other end of the pull rope is upwardly wound around an upper steering wheel of the top seat, redirected downward to be wound around the lower steering wheel on the base, redirected upward to be wound around the encoder wheel, redirected downward to be wound around the counterweight wheel of the base, redirected upward to be wound around another upper steering wheel of the top seat, and redirected downward to be specifically connected to the lower clamp.

4. The large deformation extensometer according to claim 1, characterized in that: A plurality of through holes for the pull ropes to pass through are correspondingly provided on the top seat.

5. The large deformation extensometer according to claim 1, characterized in that: The bottoms of the clamping surfaces of the sliding clamping seat and the movable clamping seat facing each other are respectively provided with clamping blades for clamping objects.

6. The large deformation extensometer according to claim 1, characterized in that: The lower steering wheel and the counterweight wheel on the base are both covered with wheel covers connected to the bracket, and the upper steering wheel on the top seat is also covered with a wheel cover connected to the bracket. Each wheel cover is correspondingly provided with two through holes for the pull rope to pass through.

7. The large deformation extensometer according to claim 1, characterized in that: A protective cover is formed between the base and the top seat on one side of the guide rod, in which the pull rope, the upper bracket of the base, the lower steering wheel and the counterweight wheel cover are arranged.

8. The large deformation extensometer according to claim 1, characterized in that: A top cover is installed on the top seat, and an upper end cover is installed on the upper surface of the top cover.

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