Strain measuring device

Abstract

The invention relates to a strain measuring device which comprises a box body, a fixed support is arranged in the box body, a rotating motor is fixedly arranged on the fixed support, the output end of the rotating motor is fixedly connected with a scale distance adjusting bidirectional sliding table, and an upper scale distance assembly and a lower scale distance assembly are arranged on two sliding blocks of the scale distance adjusting bidirectional sliding table respectively. One side of the upper scale distance assembly and one side of the lower scale distance assembly are each provided with a finger clamping assembly, a grating ruler is arranged on the upper scale distance assembly, strain measuring rods are arranged below the grating ruler and located in the upper scale distance assembly and the lower scale distance assembly, and a controller is arranged on the inner wall of the box body; the two-way sliding table is adopted to adjust the scale distance, and the scale distance adjusting efficiency is doubled; actions of the upper lever and the lower lever are replaced by two electric poles respectively, so that a power transmission line is greatly simplified, a mechanical structure is simplified, and machining difficulty is lowered; and the production efficiency and the strain measurement precision are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of material mechanical property testing, and particularly relates to a strain measurement device. Background Art

[0002] In the testing of material mechanical properties, traditional full-automatic extensometers generally have problems such as complex structures and measurement accuracies affected by various factors. The entire system has two motors. One motor is used for gauge adjustment, and the other motor is used for finger clamping, lever reset leveling, locking and releasing of the measuring rod, etc. The second motor realizes all the foregoing actions through two cams at a certain angle with a rotational action and synchronizes the actions of the upper and lower levers. The complex structural design brings a lot of difficulties in assembly and debugging during production, and the reliability cannot be effectively guaranteed.

[0003] The full-automatic extensometers in the prior art usually use springs as return devices. After long-term use, the return pulling force is likely to become smaller or even break, resulting in the blade shaft being prone to deflection and affecting the measurement accuracy. Finger clamping and loosening are driven by a DC motor to drive a lead screw to drive structures such as bevel gears and cams. This mechanism has complex transmission, large frictional resistance, and the DC motor is often damaged due to overload. Summary of the Invention

[0004] In view of the above problems existing in the prior art, the main object of the present invention is to provide a strain measurement device.

[0005] The technical solution of the present invention is as follows: A strain measurement device includes a box body. A fixed bracket is provided inside the box body. A rotating motor is fixedly provided on the fixed bracket. The output end of the rotating motor is fixedly connected to a bidirectional gauge adjustment slide. Upper and lower gauge components are respectively provided on two sliders of the bidirectional gauge adjustment slide. Finger clamping components are provided on one side of the upper and lower gauge components. A grating scale is provided on the upper gauge component. Below the grating scale, a strain measurement rod is provided inside the upper and lower gauge components. A controller is provided on the inner wall of the box body.

[0006] As a preferred embodiment, the upper gauge component includes an upper frame. A lever is provided on one side of the upper frame on the grating scale. A first electric cylinder is provided on the outer surface of one side of the upper frame. The output end of the first electric cylinder is rotatably connected to a first connecting rod. A second electric cylinder is provided at the end of the upper frame. The output end of the second electric cylinder is rotatably connected to a second connecting rod.

[0007] As a preferred embodiment, the finger clamping assembly includes a finger push rod, a finger connecting block is arranged on one side of the finger push rod, the finger push rod penetrates through the finger connecting block, a connecting rod is connected to the finger push rod through a pin, and one ends of the connecting rod far away from the finger push rod are respectively rotatably connected to a first clamping arm and a second clamping arm. The sides of the first clamping arm and the second clamping arm close to the finger connecting block are connecting seats, and the ends of the first clamping arm and the second clamping arm far away from the finger connecting block are fixedly connected with clamping blades.

[0008] As a preferred embodiment, the upper gauge length component and the lower gauge length component have a similar structure, and the difference is that the lower gauge length component does not have a lever.

[0009] As a preferred embodiment, a spring is arranged between the connecting seats, a spring piece is arranged on the finger connecting block, and the spring piece is respectively connected to the connecting seats of the corresponding first clamping arm and the second clamping arm.

[0010] Compared with the prior art, the advantages and positive effects of the present invention are as follows: the bidirectional sliding table is adopted to adjust the gauge length, and the gauge length adjustment efficiency is doubled; the actions of the upper and lower levers are respectively replaced by two electric cylinders, thus greatly simplifying the power transmission line, the mechanical structure and the processing difficulty; the production efficiency and the strain measurement accuracy are improved. Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the overall structure of a strain measurement device provided by the present invention;

[0012] Figure 2 It is a schematic diagram of the structure of the upper gauge length component of a strain measurement device provided by the present invention;

[0013] Figure 3 It is a schematic diagram of the structure of the finger clamping assembly of a strain measurement device provided by the present invention.

[0014] Legend: 1. Box body; 2. Fixed bracket; 3. Rotating motor; 4. Bidirectional sliding table for gauge length adjustment; 5. Upper gauge length component; 51. Upper frame; 52. Lever; 53. First electric cylinder; 54. First connecting rod; 55. Second electric cylinder; 56. Second connecting rod; 6. Lower gauge length component; 7. Finger clamping assembly; 71. Finger push rod; 72. Finger connecting block; 73. Connecting seat; 74. First clamping arm; 75. Clamping blade; 8. Grating ruler; 9. Strain measurement rod; 10. Controller. Detailed Embodiment

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0016] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0017] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] Embodiment

[0020] A strain measurement device includes a box body 1. Inside the box body 1, there is a fixed bracket 2. A rotating motor 3 is fixedly arranged on the fixed bracket 2. The output end of the rotating motor 3 is fixedly connected to a gauge adjustment bidirectional slide 4. An upper gauge component 5 and a lower gauge component 6 are respectively arranged on the two sliders of the gauge adjustment bidirectional slide 4. A finger clamping component 7 is arranged on one side of both the upper gauge component 5 and the lower gauge component 6. A grating scale 8 is arranged on the upper gauge component 5. Below the grating scale 8, a strain measurement rod 9 is arranged inside the upper gauge component 5 and the lower gauge component 6. A controller 10 is arranged on the inner wall of the box body 1. The measurement item is clamped and fixed by the finger clamping component 7, and the deformation of the measurement item during the stretching process is detected by using the strain measurement rod 9 on the upper gauge component 5 and the lower gauge component 6.

[0021] The upper gauge component 5 includes an upper frame 51. On one side of the upper frame 51 and on the grating scale 8, there is a lever 52. On the outer surface of one side of the upper frame 51, there is a first electric cylinder 53. The output end of the first electric cylinder 53 is rotatably connected to a first connecting rod 54. At the end of the upper frame 51, there is a second electric cylinder 55. The output end of the second electric cylinder 55 is rotatably connected to a second connecting rod 56. With the start of the second electric cylinder 55, the first connecting rod 54 is driven to move, thereby driving the finger push rod 71 to move and realizing the clamping effect of the finger clamping component 7 on the item.

[0022] The finger clamping component 7 includes a finger push rod 71. On one side of the finger push rod 71, there is a finger connecting block 72. The finger push rod 71 penetrates through the finger connecting block 72. A connecting rod is connected to the finger push rod 71 through a pin. The ends of the connecting rod far from the finger push rod 71 are respectively rotatably connected to a first clamping arm 74 and a second clamping arm. On the side of the first clamping arm 74 and the second clamping arm close to the finger connecting block 72, there is an adapter seat 73. The ends of the first clamping arm 74 and the second clamping arm far from the finger connecting block 72 are fixedly connected to clamping blades 75. By driving the connecting rod with the finger push rod 71, the connecting rod drives the first clamping arm 74 and the second clamping arm to approach or separate from each other, realizing the clamping effect.

[0023] The upper gauge component 5 and the lower gauge component 6 have a similar structure. The difference is that the lower gauge component 6 does not have a lever 52; a spring is arranged between the adapter seats 73, and a spring piece is arranged on the finger connecting block 72. The spring piece is respectively connected to the adapter seats 73 of the corresponding first clamping arm 74 and second clamping arm.

[0024] Working principle:

[0025] As shown in the figure, during use, the rotation motor 3 is started to drive the bidirectional slide 4 to move, thereby changing the distance between the finger clamping assemblies 7. By starting the second electric cylinder 55, the first connecting rod 54 is driven to move, thereby driving the finger push rod 71 to move, causing the connecting rod to drive the first clamping arm 74 and the second clamping arm to approach each other, realizing the clamping function of the test article. Moreover, the strain measuring rods 9 on the upper gauge component 5 and the lower gauge component 6 detect the deformation of the measured article during the stretching process.

[0026] Finally, it should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A strain measurement device, comprising a box body (1), characterized in that: Inside the box body (1), there is a fixed bracket (2). A rotating motor (3) is fixedly installed on the fixed bracket (2). The output end of the rotating motor (3) is fixedly connected to a gauge adjustment bidirectional slide (4). On the two sliders of the gauge adjustment bidirectional slide (4), there are respectively an upper gauge component (5) and a lower gauge component (6). On one side of both the upper gauge component (5) and the lower gauge component (6), there is a finger clamping component (7). A grating scale (8) is provided on the upper gauge component (5). Below the grating scale (8), inside the upper gauge component (5) and the lower gauge component (6), there is a strain measurement rod (9). A controller (10) is provided on the inner wall of the box body (1).

2. The strain measurement device according to claim 1, characterized in that: The upper gauge component (5) includes an upper frame (51). On one side of the upper frame (51), a lever (52) is provided on the grating scale (8). On the outer surface of one side of the upper frame (51), there is a first electric cylinder (53). The output end of the first electric cylinder (53) is rotatably connected to a first connecting rod (54). At the tail end of the upper frame (51), there is a second electric cylinder (55). The output end of the second electric cylinder (55) is rotatably connected to a second connecting rod (56).

3. The strain measurement device according to claim 1, wherein: The finger clamping component (7) includes a finger push rod (71). On one side of the finger push rod (71), there is a finger connecting block (72). The finger push rod (71) penetrates through the finger connecting block (72). A connecting rod is connected to the finger push rod (71) through a pin. The end of the connecting rod away from the finger push rod (71) is respectively rotatably connected to a first clamping arm (74) and a second clamping arm. On the side of the first clamping arm (74) and the second clamping arm close to the finger connecting block (72), there is an adapter seat (73). The ends of the first clamping arm (74) and the second clamping arm away from the finger connecting block (72) are fixedly connected to clamping blades (75).

4. A strain measurement device according to claim 1, characterized in that: The upper gauge component (5) and the lower gauge component (6) have similar structures. The difference is that the lower gauge component (6) does not have a lever (52).

5. A strain measurement device according to claim 3, characterized in that: There is a spring between the adapter seats (73). There is a spring piece on the finger connecting block (72). The spring piece is respectively connected to the adapter seats (73) of the corresponding first clamping arm (74) and second clamping arm.

Images