Effective scale distance marking device for tensile test bar

Abstract

The utility model belongs to the technical field of length measurement, and discloses an effective scale distance marking device for a tensile test bar. Comprising a base, fixing plates, mounting cylinders, sleeves and rotating mechanisms, the two fixing plates are mounted at the two ends of the top of the base, the mounting cylinders are rotatably mounted at the ends, close to each other, of the two fixing plates, the two sleeves are slidably arranged between the two mounting cylinders, test bars are connected between the mounting cylinders and the sleeves, and the rotating mechanisms are arranged at the tops of the fixing plates, the mounting cylinders and the sleeves. One end of a test bar is clamped and fixed through the fixing plate, the mounting cylinder, the rotating rod, the connecting rod, the transmission rod, the limiting spring, the clamping plate, the sector gear, the toothed plate and the push rod, a fracture at the other end of the test bar is fixed through matched use of the rotating cylinder, the pressing plate, the connecting plate, the positioning plate and the buffer spring, a rotating mechanism is additionally arranged, and the test bar can be fixed by rotating the rocker. The two ends of the test bar are fixed, and simultaneous rotation is facilitated to measure the diameter of any position.

Description

Technical Field

[0001] The utility model relates to the technical field of length measurement, and more specifically to an effective gauge length marking device for a tensile test rod. Background Art

[0002] Tensile test refers to a test method for measuring material properties under axial tensile load. The data obtained from the tensile test can be used to determine the material's elastic limit, elongation, elastic modulus, proportional limit, area reduction, tensile strength, yield point, yield strength and other tensile performance indicators.

[0003] Currently, after completing the tensile test, the fracture splicing measurement of the specimen needs to be manually fixed or a bracket is placed to fix the fracture. It cannot rotate synchronously during measurement, and the fracture diameter measurement at different angles cannot be performed. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model proposes an effective gauge length marking device for a tensile test bar.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a tensile test rod effective gauge length marking device, comprising a base, a fixed plate, a mounting tube, a sleeve and a rotating mechanism, two fixed plates are installed at both ends of the top of the base, a mounting tube is rotatably installed at one end of the two fixed plates close to each other, two sleeves are slidably arranged between the two mounting tubes, a test rod is connected between the mounting tube and the sleeve, and a rotating mechanism is arranged on the top of the fixed plate, the mounting tube and the sleeve;

[0006] The rotating mechanism includes a gear cylinder and a rocker, a support rod 1 is installed on the top of the fixed plate at one end, a rocker is rotatably installed on the upper end of the support rod 1, a dial is installed on one end of the rocker, and a round pin is also installed on one end of the rocker. A rotating rod is fixedly sleeved at the center of the gear cylinder, a support rod 2 is installed on the top of the fixed plates at both ends, the rotating rod is rotatably installed on the upper end of the support rod 2, and a groove wheel is installed on the end of the rotating rod extending out of the support rod 2, and four groups of radial grooves slidably connected to the round pins are equidistantly provided on the outer side of the groove wheel, and a locking arc slidably connected to the dial is also provided on the outer side of the groove wheel, and the locking arc is located between two adjacent radial grooves.

[0007] Furthermore, the outer side of the mounting cylinder is provided with a tooth groove that meshes with the gear cylinder, and two connecting rods are symmetrically installed inside the mounting cylinder, and a transmission rod is rotatably installed on the outer side of the connecting rod, and the side of the transmission rod that is away from each other is elastically connected to the inner wall of the mounting cylinder through a limit spring, and a clamping plate is installed at one end of the transmission rod, and a sector gear is installed at the other end of the transmission rod, and a tooth plate meshes between the two sector gears, a push rod is installed at one end of the tooth plate, and a through hole slidably connected to the push rod is opened at the upper end of the fixed plate.

[0008] Furthermore, a support plate is installed at the bottom of the sleeve, a sliding block is installed at the bottom of the support plate, and a sliding groove slidably connected to the sliding block is provided at the top of the base.

[0009] Furthermore, the ends of the sleeves that are away from each other are each provided with a rotating hole, a rotating drum is rotatably mounted on the inner circle of the rotating hole, and a through hole that is slidably connected to the test rod is provided at the middle end of the rotating drum.

[0010] Furthermore, the top and bottom of the rotating drum located on the outside of the sleeve are provided with connecting holes, and the inside of the connecting hole is slidably connected with a connecting plate, and a pressure plate is installed on the side of the connecting plate extending out of the rotating drum, and a positioning plate is installed on the other side of the connecting plate extending into the inside of the rotating drum, and a buffer spring is elastically connected between the positioning plate and the inner wall of the rotating drum.

[0011] Furthermore, two mutually meshing spur gears are rotatably installed at the upper end of the sleeve, and the outer side of the rotating cylinder located inside the sleeve is provided with two tooth grooves meshing with the bottom spur gear. The top of the sleeve is provided with an opening rotatably connected to the top spur gear, and the part of the top spur gear extending out of the opening meshes with the gear cylinder.

[0012] Compared with the prior art, the utility model has the following beneficial effects: one end of the test rod is clamped and fixed by a fixing plate, a mounting cylinder, a rotating rod, a connecting rod, a transmission rod, a limit spring, a clamping plate, a sector gear, a toothed plate and a push rod; the fracture at the other end of the test rod is fixed by the coordinated use of a rotating cylinder, a pressure plate, a connecting plate, a positioning plate and a buffer spring; a rotating mechanism is added, and the two ends of the test rod are fixed by rotating the rocker, so that simultaneous rotation is convenient to measure the diameter at any position. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 For the utility model Figure 1 A magnified view of the structure at center;

[0015] Figure 3 This is a cross-sectional view of the internal structure of the fixing plate and the mounting tube of the utility model;

[0016] Figure 4 It is a schematic diagram of the structure on the sleeve of the utility model;

[0017] Figure 5 This is a cross-sectional view of the internal structure of the sleeve of the utility model;

[0018] Figure 6 It is a cross-sectional view of the internal structure of the sleeve and the rotating drum of the utility model.

[0019] In the figure:

[0020] 1. Base; 2. Fixed plate; 3. Mounting cylinder; 4. Sleeve; 5. Test rod; 6. Gear cylinder; 7. Rocker; 8. Dial; 9. Round pin; 10. Groove wheel; 11. Turning rod; 12. Connecting rod; 13. Transmission rod; 1301, Limit spring; 14. Clamp; 15. Fan gear; 16. Tooth plate; 17. Push rod; 18. Support plate; 19. Slider; 20. Rotating cylinder; 21. Spur gear; 22. Pressure plate; 23. Connecting plate; 24. Positioning plate; 25. Buffer spring. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-6The utility model provides the following technical solutions: a device for marking effective gauge length of a tensile test rod, comprising a base 1, a fixed plate 2, a mounting tube 3, a sleeve 4 and a rotating mechanism, two fixed plates 2 are installed at both ends of the top of the base 1, and the mounting tube 3 is rotatably installed at one end of the two fixed plates 2 close to each other, and the outer side of the mounting tube 3 is provided with a tooth groove 1 meshing with a gear tube 6, and the gear tube 6 rotates, and the mounting tube 3 is synchronously rotated through the tooth groove 1, so that one end of the test rod 5 rotates, and two connecting rods 12 are symmetrically installed inside the mounting tube 3, and a transmission rod 13 is rotatably installed on the outer side of the connecting rod 12, and the side of the transmission rod 13 that is away from each other is elastically connected to the inner wall of the mounting tube 3 through a limit spring 1301, and the rotation angle of the transmission rod 13 is limited by the limit spring 1301. A clamping plate 14 is installed at one end of 13, and an anti-skid strip is provided on the side of the clamping plates 14 that are close to each other. The anti-skid strip contacts the outer side of the test rod 5 to increase the friction resistance with the test rod 5. A sector gear 15 is installed at the other end of the transmission rod 13, and a tooth plate 16 is meshed between the two sector gears 15. A push rod 17 is installed at one end of the tooth plate 16. A through hole slidably connected to the push rod 17 is opened at the upper end of the fixed plate 2. The push rod 17 is cylindrical. The push rod 17 can rotate and slide in the through hole. The linear movement of the tooth plate 16 is realized by sliding the push rod 17. The tooth plate 16 drives the sector gear 15 to rotate, and the opening and closing action of the clamping plate 14 is realized by the transmission rod 13. Two sleeves 4 are slidably arranged between the two mounting cylinders 3, and a support plate 18 is installed at the bottom of the sleeve 4 A slider 19 is installed at the bottom of the support plate 18, and a slide groove slidably connected to the slider 19 is provided on the top of the base 1. The sleeve 4 slides linearly through the slide groove and the slider 19. The ends of the sleeves 4 that are away from each other are provided with rotation holes, and a rotating cylinder 20 is rotatably installed in the inner circle of the rotating hole. A through hole slidably connected to the test rod 5 is provided at the middle end of the rotating cylinder 20. A fixing hole that is connected to the through hole is provided at the other end of the sleeve 4. The through hole and the fixing hole enable the test rod 5 to move through the sleeve 4 and the rotating cylinder 20. The rotating cylinder 20 located on the outside of the sleeve 4 is provided with connecting holes at the top and bottom, and a connecting plate 23 is slidably connected to the inside of the connecting hole. A pressure plate 22 is installed on one side of the connecting plate 23 extending out of the outside of the rotating cylinder 20, and a positioning plate 24 is installed on the other side of the connecting plate 23 extending into the inside of the rotating cylinder 20. The pressure plate 22 and the positioning plate 24 are both perpendicular to the connecting plate 23. A buffer spring 25 is elastically connected between the positioning plate 24 and the inner wall of the rotating drum 20. The buffer spring 25 limits the sliding distance of the positioning plate 24. One end of the rotating drum 20 is provided with a guide groove slidably connected to the positioning plate 24. A clamping groove adapted to the size of the test rod 5 is provided between the two positioning plates 24. The clamping groove increases the contact area between the test rod 5 and the positioning plate 24, and increases the stability of the fixation of the test rod 5. Two mutually meshing spur gears 21 are rotatably installed on the upper end of the sleeve 4. The outer side of the rotating drum 20 located inside the sleeve 4 is provided with a tooth groove 2 meshing with the bottom spur gear 21. The top of the sleeve 4 is provided with an opening rotatably connected to the top spur gear 21. The part of the top spur gear 21 extending out of the opening meshes with the gear cylinder 6.The top spur gear 21 is in contact with the gear cylinder 6 through the opening, and a test rod 5 is connected between the mounting cylinder 3 and the sleeve 4.

[0023] A rotating mechanism is provided on the top of the fixed plate 2, the mounting cylinder 3 and the sleeve 4, and the rotating mechanism includes a gear cylinder 6 and a rocker 7. A support rod 1 is installed on the top of the fixed plate 2 at one end, and a rocker 7 is rotatably installed on the upper end of the support rod 1. A dial 8 is installed at one end of the rocker 7, and a round pin 9 is also installed at one end of the rocker 7. A rotating rod 11 is fixedly sleeved at the center of the gear cylinder 6, and a support rod 2 is installed on the top of the fixed plates 2 at both ends. The rotating rod 11 is rotatably installed on the upper end of the support rod 2. A groove wheel 10 is installed on the end of the rotating rod 11 extending out of the support rod 2. Four groups of radial grooves slidably connected to the round pin 9 are equidistantly provided on the outer side of the groove wheel 10. The outer side of 10 is also provided with a locking arc slidably connected to the dial 8, and the locking arc is located between two adjacent radial grooves. The rocker 7 is turned to realize the rotation of the dial 8 and the round pin 9. When the round pin 9 enters the radial groove of the groove wheel 10, it drives the groove wheel 10 to rotate ninety degrees. When the round pin 9 is disengaged from the radial groove, the locking arc of the dial 8 and the groove wheel 10 slides, and the groove wheel 10 is in a stationary state. The rocker 7 continues to rotate, and the round pin 9 is again transferred into the radial groove of the groove wheel 10, and the groove wheel 10 is rotated ninety degrees again, thereby realizing the intermittent rotation of the groove wheel 10 and making the test rod 5 synchronously and intermittently rotate ninety degrees, which is convenient for measuring the diameter at any position.

[0024] Working principle: After the tensile test, push the two push rods 17 towards one end close to each other, the push rod 17 drives the tooth plate 16 to move, the tooth plate 16 meshes with the fan gear 15, drives the fan gear 15 to rotate, the fan gear 15 drives the transmission rod 13 and the clamping plate 14 to rotate, the transmission rod 13 rotates, the limit spring 1301 is squeezed when the transmission rod 13 rotates, and the two clamping plates 14 are unfolded at the same time, one end of the test rod 5 is placed in the gap between the two clamping plates 14, and then the push rod 17 is released, the limit spring 1301 is pressed. The resilience of 01 drives the transmission rod 13 to rotate in the opposite direction, and the transmission rod 13 drives the two clamping plates 14 to clamp and fix the test rod 5, and slides the pressure plate 22 to the outside away from the through hole, and the pressure plate 22 drives the connecting plate 23 and the positioning plate 24 to slide, and the positioning plate 24 opens the through hole at the middle end of the rotating cylinder 20. At the same time, the positioning plate 24 squeezes the buffer spring 25, slides the two sleeves 4, and makes the fracture of the test rod 5 pass through the through hole, and then releases the pressure plate 22, and the resilience of the buffer spring 25 drives the positioning plate 24 to slide The other end of the test rod 5 is fixed, thereby completing the fixation of the two ends of the test rod 5, and the rocker 7 is rotated. The rocker 7 drives the dial 8 and the round pin 9 to rotate. When the round pin 9 enters the radial groove of the groove wheel 10, it drives the groove wheel 10 to rotate 90 degrees. When the round pin 9 is disengaged from the radial groove, the locking arc of the dial 8 and the groove wheel 10 slides, and the groove wheel 10 is in a stationary state. The rocker 7 continues to rotate. When the round pin 9 enters the radial groove of the groove wheel 10 again, the groove wheel 10 rotates 90 degrees again, realizing the intermittent rotation of the groove wheel 10 The grooved wheel 10 drives the rotating rod 11 and the gear cylinder 6 to rotate, the gear cylinder 6 meshes with the tooth groove 1 of the mounting cylinder 3, and drives the mounting cylinder 3 to rotate. At the same time, the gear cylinder 6 meshes with the top spur gear 21, and drives the top spur gear 21 to rotate. The top spur gear 21 meshes with the bottom spur gear 21, and drives the bottom spur gear 21 to rotate. The bottom spur gear 21 meshes with the tooth groove 2 of the rotating cylinder 20, and drives the rotating cylinder 20 to rotate, thereby realizing the overall synchronous rotation of the test rod 5, so as to facilitate the measurement of the diameter at any position.

[0025] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0026] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A tensile test bar effective gauge length marking device, comprising a base (1), a fixing plate (2), a mounting tube (3), a sleeve (4) and a rotating mechanism, characterized in that: Two fixing plates (2) are installed at both ends of the top of the base (1); a mounting tube (3) is rotatably installed at one end of the two fixing plates (2) close to each other; two sleeves (4) are slidably arranged between the two mounting tubes (3); a test rod (5) is connected between the mounting tube (3) and the sleeve (4); and a rotating mechanism is provided at the top of the fixing plate (2), the mounting tube (3) and the sleeve (4); The rotating mechanism comprises a gear cylinder (6) and a rocker (7), a support rod 1 is installed on the top of the fixed plate (2) at one end, a rocker (7) is rotatably installed on the upper end of the support rod 1, a dial (8) is installed on one end of the rocker (7), and a round pin (9) is also installed on one end of the rocker (7), a rotating rod (11) is fixedly sleeved at the center of the gear cylinder (6), a support rod 2 is installed on the top of the fixed plates (2) at both ends, the rotating rod (11) is rotatably installed on the upper end of the support rod 2, and a groove wheel (10) is installed on one end of the rotating rod (11) extending out of the support rod 2, and four groups of radial grooves slidably connected to the round pin (9) are equidistantly arranged on the outer side of the groove wheel (10), and a locking arc slidably connected to the dial (8) is also arranged on the outer side of the groove wheel (10), and the locking arc is located between two adjacent radial grooves.

2. A tensile test bar effective gauge length marking device according to claim 1, characterized in that: The outer side of the installation cylinder (3) is provided with a tooth groove that meshes with the gear cylinder (6), and two connecting rods (12) are symmetrically installed inside the installation cylinder (3). A transmission rod (13) is rotatably installed on the outer side of the connecting rod (12), and the side of the transmission rod (13) that is away from each other is elastically connected to the inner wall of the installation cylinder (3) through a limit spring (1301). A clamping plate (14) is installed at one end of the transmission rod (13), and a fan-shaped gear (15) is installed at the other end of the transmission rod (13). A tooth plate (16) meshes between the two fan-shaped gears (15), and a push rod (17) is installed at one end of the tooth plate (16). The upper end of the fixed plate (2) is provided with a through hole that is slidably connected to the push rod (17).

3. A tensile test bar effective gauge length marking device according to claim 1, characterized in that: A support plate (18) is installed at the bottom of the sleeve (4), a slider (19) is installed at the bottom of the support plate (18), and a slide groove slidably connected to the slider (19) is provided at the top of the base (1).

4. A tensile test bar effective gauge length marking device according to claim 1, characterized in that: The ends of the sleeves (4) that are away from each other are each provided with a rotating hole, a rotating drum (20) is rotatably mounted on the inner circle of the rotating hole, and a through hole that is slidably connected to the test rod (5) is provided at the middle end of the rotating drum (20).

5. A tensile test bar effective gauge length marking device according to claim 4, characterized in that: The top and bottom of the rotating drum (20) located on the outside of the sleeve (4) are provided with connecting holes, and a connecting plate (23) is slidably connected inside the connecting hole. A pressure plate (22) is installed on one side of the connecting plate (23) extending out of the outside of the rotating drum (20), and a positioning plate (24) is installed on the other side of the connecting plate (23) extending into the inside of the rotating drum (20). A buffer spring (25) is elastically connected between the positioning plate (24) and the inner wall of the rotating drum (20).

6. A tensile test bar effective gauge length marking device according to claim 5, characterized in that: Two mutually meshing spur gears (21) are rotatably mounted on the upper end of the sleeve (4); the outer side of the rotating cylinder (20) located inside the sleeve (4) is provided with two tooth grooves meshing with the bottom spur gear (21); the top of the sleeve (4) is provided with an opening rotatably connected to the top spur gear (21); the part of the top spur gear (21) extending out of the opening meshes with the gear cylinder (6).

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