Balancing device for contact type extensometer

Abstract

The utility model discloses a balancing device for a contact type extensometer, which comprises a bottom plate, a bottom rod and a top rod, the top rod is provided with a through hole, an inner shaft is arranged in the through hole, the inner shaft is connected with a rotating head through a bearing, and the left side and the right side of the rotating head are respectively provided with a side rod; a balancing weight is slidably connected to the side rod located on one side of the rotating head, and a sliding block is slidably connected to the side rod located on the other side of the rotating head. A top hook is arranged at the bottom end of the sliding block; the device further comprises a chain hung on the top hook, a connecting rod is arranged at the bottom end of the chain and used for being connected with the extensometer, unbalance loading of the gravity of the extensometer on the thin plate sample is eliminated by means of the lever principle through the arrangement of the top rod, the rotating head, the side rod and the like, and meanwhile, by means of the arrangement of the chain, the stability of the thin plate sample is improved. Therefore, the connection between the extensometer and the sheet sample can be adjusted in time, the measurement accuracy is ensured, the unbalance loading prevention effect of the device is greatly improved, the rotation resistance of the rotating head is greatly reduced through the arrangement of the bearing, and the sensitivity of the device is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of material testing devices, in particular to a balancing device for a contact extensometer. Background Technique

[0002] In the test of material mechanical properties, a contact extensometer is an important tool for measuring the tensile deformation of a sample.

[0003] However, for thin plate samples or wire samples with a small diameter, the weight of the extensometer often exerts an additional off-axis load on them, causing the sample to tilt, thereby affecting the accuracy of deformation measurement.

[0004] In the prior art, the extensometer can be clamped by a fixture. The operation process is relatively cumbersome, and the installation position of the fixture cannot be flexibly adjusted according to the use position of the extensometer. At the same time, since the connection between the fixture and the extensometer is mostly a rigid connection, an additional off-axis load on the test sample cannot be avoided during installation and fixation, and the effect is not good. Therefore, a balancing device for a contact extensometer is proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide a balancing device for a contact extensometer to solve the problems in the prior art that the operation of clamping the extensometer by a fixture to avoid an additional off-axis load on the sample is cumbersome and the effect of avoiding off-axis load is not good due to the rigid connection between the fixture and the extensometer.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A balancing device for a contact extensometer, including a bottom plate, a bottom rod is arranged on the top of the bottom plate, the bottom rod is fixedly connected with a top rod through a first fastening bolt, a through hole is opened on the top side wall of the top rod, and an inner shaft is fixedly connected in the through hole;

[0007] The inner shaft is connected with a rotating head through a bearing, and side rods are fixedly connected to both the left and right sides of the rotating head;

[0008] A counterweight block is slidably connected to the side rod on one side of the rotating head;

[0009] A slider is slidably connected to the side rod on the other side of the rotating head;

[0010] The bottom end of the slider is fixedly connected with a top hook;

[0011] The device further includes a chain suspended on the top hook, and a connecting rod is arranged at the bottom end of the chain, and the connecting rod is used to connect the extensometer.

[0012] Preferably: The direction of the inner shaft is perpendicular to the opening direction of the through hole.

[0013] Preferably, an internal threaded hole is provided on the counterweight block, and the counterweight block is fixedly connected to the side rod by screwing with a second fastening bolt into the internal threaded hole.

[0014] Preferably, a threaded through-hole is provided on the slider, and the slider is fixedly connected to the side rod by screwing with a third fastening bolt through the threaded through-hole.

[0015] Preferably, limit screws are provided at the ports of the side rod away from the rotating head for restricting the counterweight block or the slider from sliding out of the side rod.

[0016] Preferably, the bottom end of the connecting rod can be fixedly connected to the top surface of the extensometer by adhesive.

[0017] Preferably, a long and narrow opening is provided on the bottom rod, a plurality of threaded holes are provided on the top rod, and the first fastening bolt passes through the long and narrow opening and is threadedly connected to the threaded holes for adjusting the height of the top rod.

[0018] Preferably, the bearing is arranged between the inner shaft and the rotating head for reducing the resistance of the rotating head to rotate.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] 1. Through the settings of the top rod, the rotating head, the side rod, etc., the lever principle is utilized to eliminate the eccentric load of the gravity of the extensometer on the thin plate sample. At the same time, by means of the setting of the chain, when there is an eccentric load caused by horizontal deviation in the connection between the extensometer and the thin plate sample, the chain will tilt, and then the side rod will tilt, so as to timely adjust the connection between the extensometer and the thin plate sample, ensure the measurement accuracy, greatly improve the anti-eccentric load effect of the present device, and the structure is simple and easy to operate.

[0021] 2. Through the setting of the bearing, the resistance of the rotating head to rotate is greatly reduced, the sensitivity of the present device is greatly improved, and thus the accuracy of the extensometer during the measurement process is better maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the overall structural view of the present utility model;

[0023] Figure 2 is the front view of the present utility model;

[0024] Figure 3 is the top view of the present utility model;

[0025] Figure 4 is the connection schematic diagram of the rotating head and the inner shaft in the present utility model.

[0026] In the figure: 1. Bottom plate; 101. Bottom rod; 102. Top rod; 103. First fastening bolt; 104. Long narrow opening; 105. Threaded hole; 2. Inner shaft; 201. Rotating head; 202. Side rod; 203. Bearing; 204. Limit screw; 3. Counterweight; 301. Internal threaded hole; 302. Second fastening bolt; 4. Slide block; 401. Top hook; 402. Chain; 403. Connecting rod; 404. Third fastening bolt; 5. Extensometer. Detailed implementation mode

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Refer to Figures 1-4 As shown, the present invention provides a technical solution for a balance device for a contact extensometer:

[0029] Refer to Figure 1 And Figure 2 As shown, a balance device for a contact extensometer includes a bottom plate 1. Among them, the bottom plate 1 may be provided with connection holes. When using this device, the device can be fixed beside the use position by bolts passing through the connection holes, so as to keep the device stable. A bottom rod 101 is arranged on the top of the bottom plate 1. The bottom rod 101 is fixedly connected with a top rod 102 through a first fastening bolt 103. Among them, it should be added that a long narrow opening 104 is provided on the bottom rod 101, and a plurality of threaded holes 105 are provided on the top rod 102. The first fastening bolt 103 passes through the long narrow opening 104 and is threadedly connected with the threaded hole 105 to adjust the height of the top rod 102 to meet the use requirements. A through hole is provided on the top side wall of the top rod 102, and an inner shaft 2 is fixedly connected in the through hole. Among them, it should be added that the direction of the inner shaft 2 is perpendicular to the opening direction of the through hole. The inner shaft 2 is connected with a rotating head 201 through a bearing 203. Refer to Figure 4 As shown, the bearing 203 is arranged between the inner shaft 2 and the rotating head 201 to reduce the resistance of the rotating head 201 during rotation. Side rods 202 are fixedly connected to both the left and right sides of the rotating head 201. Refer to Figure 2As shown, it should be noted that a counterweight 3 is slidably connected to the side rod 202 on one side of the rotating head 201. Among them, the counterweight 3 can be fixed on the side rod 202. A slider 4 is slidably connected to the side rod 202 on the other side of the rotating head 201. Among them, the slider 4 can be fixed on the side rod 202. The bottom end of the slider 4 is fixedly connected with a top hook 401. The device further includes a chain 402 suspended on the top hook 401. The bottom end of the chain 402 is provided with a connecting rod 403, and the connecting rod 403 is used to connect the extensometer 5. It should be noted that the bottom end of the connecting rod 403 can be fixedly connected to the top surface of the extensometer 5 through glue.

[0030] Refer to Figure 2 and Figure 3 As shown, an internal threaded hole 301 is formed in the counterweight 3. The counterweight 3 is threadedly connected and fixed to the side rod 202 through the second fastening bolt 302. When using this device, after adjusting the position of the counterweight 3, the second fastening bolt 302 can be rotated to make it abut against the side rod 202, so that the position of the counterweight 3 on the side rod 202 is fixed.

[0031] Refer to Figure 4 As shown, a threaded through-hole is formed in the slider 4. The slider 4 is threadedly connected and fixed to the side rod 202 through the threaded through-hole. When using this device, after adjusting the position of the slider 4, the third fastening bolt 404 can be tightened to make it abut against the side rod 202, so that the position of the slider 4 on the side rod 202 is fixed.

[0032] Refer to Figure 4 As shown, limit screws 204 are provided at the ports of the side rod 202 far from the rotating head 201, which are used to limit the counterweight 3 or the slider 4 from sliding out of the side rod 202.

[0033] Through the setting of the bearing 203, the resistance of the rotating head 201 to rotate is greatly reduced, which greatly improves the sensitivity of this device, so as to better maintain the accuracy of the extensometer 5 during the measurement process.

[0034] Through the settings of the top rod 102, the rotating head 201, the side rod 202, etc., the lever principle is utilized to eliminate the eccentric load of the gravity of the extensometer 5 on the thin plate sample. At the same time, through the setting of the chain 402, when there is an eccentric load caused by horizontal deviation in the connection between the extensometer 5 and the thin plate sample, the chain 402 will tilt, and then the side rod 202 will tilt, so as to timely adjust the connection between the extensometer 5 and the thin plate sample, ensure the measurement accuracy, greatly improve the anti-eccentric load effect of this device, and the structure setting is simple and easy to operate.

[0035] Working principle: When using this device, first apply adhesive to the bottom surface of the connecting rod 403, then press the bottom surface of the connecting rod 403 against the middle of the top surface of the extensometer 5, so that the connecting rod 403 and the extensometer 5 are fixedly connected. Then, fix the bottom plate 1 beside the thin plate sample by passing bolts through the connecting holes opened thereon according to the position of the thin plate sample to be measured by the extensometer 5. Hang the chain 402 on the top hook 401, and then adjust the height of the top rod 102 according to the position and height of the thin plate sample. When adjusting the height of the top rod 102, only need to loosen the first fastening bolt 103 so that the first fastening bolt 103 disengages from the threaded hole 105. After adjusting the height of the top rod 102, then pass the first fastening bolt 103 through the long narrow opening 104 and thread it with the threaded hole 105 to fix the position of the top rod 102. After the height of the top rod 102 is adjusted, push the slider 4 so that the slider 4 slides on the side rod 202. Move the part of the extensometer 5 in contact with the thin plate sample behind the thin plate sample, and then tighten the third fastening bolt 404 so that the third fastening bolt 404 abuts against the side rod 202, thereby fixing the slider 4 at this position on the side rod 202. At this time, push the counterweight 3 to slide on the side rod 202 until the side rod 202 is in a horizontal state, and tighten the second fastening bolt 302 so that the second fastening bolt 302 abuts against the side rod 202, thereby fixing the counterweight 3 at this position on the side rod 202. At this time, the extensometer 5 can be connected to the thin plate sample for measurement. During the measurement process, if the side rod 202 is inclined, it means that the extensometer 5 exerts pressure or tension on the thin plate sample, and the connection between the extensometer 5 and the thin plate sample needs to be readjusted.

[0036] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A balance device for a contact extensometer, comprising a bottom plate (1), characterized in that: A bottom rod (101) is provided on the top of the bottom plate (1). The bottom rod (101) is fixedly connected to a top rod (102) by a first fastening bolt (103). A through hole is formed in the top side wall of the top rod (102), and an inner shaft (2) is fixedly connected in the through hole; The inner shaft (2) is connected to a rotating head (201) through a bearing (203). Side rods (202) are fixedly connected to both the left and right sides of the rotating head (201); A counterweight (3) is slidably connected to the side rod (202) on one side of the rotating head (201); A slider (4) is slidably connected to the side rod (202) on the other side of the rotating head (201); A top hook (401) is fixedly connected to the bottom end of the slider (4); The device further includes a chain (402) suspended on the top hook (401). A connecting rod (403) is provided at the bottom end of the chain (402), and the connecting rod (403) is used to connect an extensometer (5).

2. The balance device for a contact extensometer according to claim 1, characterized in that: The direction of the inner shaft (2) is perpendicular to the opening direction of the through hole.

3. The balance device for a contact extensometer according to claim 1, characterized in that: An internal threaded hole (301) is formed in the counterweight (3). The counterweight (3) is threadedly connected and fixed to the side rod (202) through the internal threaded hole (301) by a second fastening bolt (302).

4. A balance device for a contact extensometer according to claim 1, characterized in that: A threaded through hole is formed in the slider (4). The slider (4) is threadedly connected and fixed to the side rod (202) through the threaded through hole by a third fastening bolt (404).

5. A balance device for a contact extensometer according to claim 1, characterized in that: Limit screws (204) are provided at the ports of the side rods (202) away from the rotating head (201) to prevent the counterweight (3) or the slider (4) from sliding out of the side rods (202).

6. The balance device for a contact extensometer according to claim 1, wherein: The bottom end of the connecting rod (403) can be fixedly connected to the top surface of the extensometer (5) by glue.

7. A balance device for a contact extensometer according to claim 1, characterized in that: A long and narrow opening (104) is formed in the bottom rod (101), and a plurality of threaded holes (105) are formed in the top rod (102). The first fastening bolt (103) passes through the long and narrow opening (104) and is threadedly connected to the threaded holes (105) to adjust the height of the top rod (102).

8. A balance device for a contact extensometer according to claim 1, characterized in that: The bearing (203) is provided between the inner shaft (2) and the rotating head (201) to reduce the resistance of the rotating head (201) during rotation.

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