High-precision automatic calibration table of strain sensor

Abstract

The utility model discloses a high-precision automatic calibration table of a strain sensor, which relates to the technical field of strain sensor calibration and comprises a base, a movable plate slidably connected along the length direction of the base is arranged at the top of the base, and first notches are arranged at two ends of the movable plate along the width direction of the top of the base. Clamping seats fixed to the top of the movable plate are arranged on one side of the first notch, a strain sensor body is clamped between the two clamping seats, a pressing head is arranged above the strain sensor body, and the two side walls of the strain sensor body abut against pressure probes rotationally installed on the clamping seats; the side wall of the movable plate is in threaded connection with a screw rod arranged in the length direction of the top of the base, and a driving motor for driving the screw rod to rotate and a conveying belt are fixed to the top of the base; according to the utility model, the two detection probes are abutted against the two ends of the strain sensor to detect whether the clamping seat and the strain sensor have relative displacement, so that the detection value of the strain sensor is accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of strain sensor calibration, in particular to a high-precision automatic calibration platform for strain sensors. Background Art

[0002] Strain is one of the most important and basic physical quantities that need to be monitored in various fields, and plays a vital role in the completion of various projects. Strain sensors have the advantages of high measurement sensitivity, strong waterproof performance, anti-electromagnetic interference, long signal transmission distance and corrosion resistance, and can remotely monitor the long-term health of the building structure.

[0003] During use of the existing high-precision automatic calibration platform for strain sensors, when the strain sensor is subjected to the force of the pressure head, a slight displacement occurs between the fixture and the strain sensor, resulting in inaccurate calibration values.

[0004] In view of this, this application is hereby filed. Utility Model Content

[0005] The utility model aims to provide a high-precision automatic calibration platform for strain sensors to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the utility model provides a high-precision automatic calibration platform for a strain sensor, including a base, a movable plate slidably connected along the length direction of the base is provided on the top of the base, and notches are provided at both ends of the movable plate along the width direction of the top of the base, and a clamping seat fixed to the top of the movable plate is provided on one side of the notch, a strain sensor body is clamped between the two clamping seats, a pressure head is provided above the strain sensor body, and both side walls of the strain sensor body are abutted with pressure probes rotatably mounted on the clamping seats.

[0007] Furthermore, a guide column is fixed on the top of the base, a top plate is fixed on the top of the guide column, an inverted hydraulic cylinder is installed on the top of the top plate, a pressure plate slidably connected to the guide column is fixed on the output end of the hydraulic cylinder, a pressure head is fixedly connected to the bottom center of the pressure plate, and an avoidance channel is provided at the bottom of the pressure plate directly above the notch.

[0008] Furthermore, the side wall of the movable plate is threadedly connected with a screw rod arranged along the length direction of the top of the base, and a driving motor and a conveyor belt for driving the screw rod to rotate are fixed to the top of the base.

[0009] Furthermore, the clamp seat includes a lower clamp plate fixed to the top of the movable plate, an upper clamp plate arranged parallel to the top of the lower clamp plate, and an adjustment rod connecting the upper clamp plate and the lower clamp plate, the adjustment rod is located directly below the avoidance channel, the adjustment rod passes through the upper clamp plate and is rotatably connected thereto, the bottom of the adjustment rod is threadedly connected to the top of the lower clamp plate, and the outer walls of the upper clamp plate and the lower clamp plate that are close to each other are fixed with anti-slip pads.

[0010] Furthermore, the side walls of the two lower clamps that are away from each other are each provided with a notch 2 located above the notch 1, and the vertical cross-section of the notch 2 is an inverted right-angled trapezoidal structure. A rotating cylinder arranged toward the strain sensor body is rotatably connected to the notch 2 through a horizontally arranged rotating rod, and a damping pad is provided on the outer wall of the rotating rod, which is pressed between the notch 2 and the side walls of the rotating cylinder that are close to each other.

[0011] Furthermore, a mounting cylinder is passed through the middle of the rotating cylinder and is threadedly connected thereto, the pressure probe is fixed to the end of the mounting cylinder through a sleeve, and a wiring groove is provided on the outer wall of the mounting cylinder close to the sleeve.

[0012] Compared with the prior art, the beneficial effects of the utility model are: by connecting two detection probes to the two ends of the strain sensor, it is detected whether the clamp seat and the strain sensor have relative displacement, so that the strain sensor detection value is accurate; by setting a screw rod and a drive motor, the movable plate drives the position between the clamp seat and the strain sensor to change, and a force is applied to different positions of the strain sensor, so as to realize multiple sets of data calibration and improve data accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a high-precision automatic calibration platform for strain sensors;

[0014] Figure 2 A schematic diagram of the structure of a clamping seat in a high-precision automatic calibration platform for strain sensors;

[0015] Figure 3 The figure is a schematic diagram of the structure of the connection between the mounting tube and the sleeve in a high-precision automatic calibration platform for strain sensors.

[0016] In the figure:

[0017] 10. Base; 11. Press head; 12. Guide column; 13. Press plate; 14. Hydraulic cylinder; 15. Avoidance passage;

[0018] 20. movable plate; 21. gap one;

[0019] 30. Lower clamping plate; 31. Notch 2; 32. Adjusting rod; 33. Clamping seat;

[0020] 40. rotating cylinder; 41. rotating rod; 42. damping pad;

[0021] 50. Strain sensor body;

[0022] 60. Installation tube; 61. Sleeve; 62. Pressure probe; 63. Wiring trough;

[0023] 70. Driving motor; 71. Screw; 72. Conveyor belt. DETAILED DESCRIPTION

[0024] 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.

[0025] See also Figure 1-3 , the utility model provides a technical solution:

[0026] See also Figure 1-3 As shown, a high-precision automatic calibration platform for strain sensors includes a base 10, a movable plate 20 slidably connected along the length direction of the base 10 is provided on the top of the base 10, notches 21 are provided at both ends of the movable plate 20 along the width direction of the top of the base 10, a clamping seat 33 fixed to the top of the movable plate 20 is provided on one side of the notch 21, a strain sensor body 50 is clamped between the two clamping seats 33, a pressure head 11 is provided above the strain sensor body 50, and both side walls of the strain sensor body 50 are abutted with pressure probes 62 rotatably mounted on the clamping seat 33, a guide column 12 is fixed on the top of the base 10, a top plate is fixed on the top of the guide column 12, an inverted hydraulic cylinder 14 is installed on the top of the top plate, a pressure plate 13 slidably connected to the guide column 12 is fixed on the output end of the hydraulic cylinder 14, the pressure head 11 is fixedly connected to the bottom center of the pressure plate 13, and an avoidance channel 15 located directly above the notch 21 is provided at the bottom of the pressure plate 13. The strain sensor body 50 is clamped and fixed by two clamping seats 33, and two pressure probes 62 are respectively abutted against the two side walls of the strain sensor body 50. The hydraulic cylinder 14 causes the pressure plate 13 to drive the pressure head 11 to move downward, and the pressure head 11 applies a force to the strain sensor body 50. During this process, the value displayed by the pressure probe 62 remains unchanged, indicating that no deformation occurs between the strain sensor body 50 and the clamping seat 33. The value displayed by the strain sensor body 50 is accurate, with high precision and a high degree of automation.

[0027] See also Figure 1-3As shown, a high-precision automatic calibration platform for strain sensors, the side wall of the movable plate 20 is threadedly connected with a screw 71 arranged along the length direction of the top of the base 10, and the top of the base 10 is fixed with a driving motor 70 and a conveyor belt 72 for driving the screw 71 to rotate. The screw 71 is rotated by the driving motor 70 and the conveyor belt 72, and the movable plate 20 moves horizontally. The pressure head 11 repeatedly calibrates different positions of the strain sensor body 50 for multiple times, and the detection value is accurate.

[0028] See also Figure 1-3 As shown, a high-precision automatic calibration platform for strain sensors, the clamp seat 33 includes a lower clamp plate 30 fixed to the top of the movable plate 20, an upper clamp plate arranged parallel to the upper clamp plate 30, and an adjustment rod 32 connecting the upper clamp plate and the lower clamp plate 30, the adjustment rod 32 is located directly below the avoidance channel 15, the adjustment rod 32 passes through the upper clamp plate and is rotatably connected thereto, the bottom of the adjustment rod 32 is threadedly connected to the top of the lower clamp plate 30, and the outer walls of the upper clamp plate and the lower clamp plate 30 close to each other are fixed with anti-skid pads. The anti-skid pads enable the clamp seat 33 to firmly clamp the strain sensor body 50, reduce the possibility of relative displacement between the clamp seat 33 and the strain sensor body 50 during the calibration process, and cause inaccurate calibration values, the adjustment rod 32 adjusts the spacing between the upper clamp plate and the lower clamp plate 30, is suitable for the calibration of strain sensor bodies 50 of different thicknesses, is firmly fixed, and has a wide range of applications.

[0029] See also Figure 1-3 As shown, a high-precision automatic calibration platform for strain sensors, the side walls of the two lower clamping plates 30 that are away from each other are each provided with a second notch 31 located above the first notch 21, the vertical section of the second notch 31 is an inverted right-angle trapezoidal structure, the second notch 31 is rotatably connected to a rotating cylinder 40 disposed toward the strain sensor body 50 through a horizontally disposed rotating rod 41, the outer wall of the rotating rod 41 is sleeved with a damping pad 42, and the damping pad 42 is pressed between the second notch 31 and the side walls of the rotating cylinder 40 that are close to each other. The damping pad 42 allows the rotating cylinder 40 to rotate to a suitable angle, so that the pressure probe 62 can abut against the edge of the strain sensor body 50.

[0030] See also Figure 1-3 As shown, a high-precision automatic calibration platform for strain sensors, a mounting cylinder 60 is passed through the middle of a rotating cylinder 40 and is threadedly connected, a pressure probe 62 is fixed to the end of the mounting cylinder 60 through a sleeve 61, and a wiring groove 63 is provided on the outer wall of the mounting cylinder 60 near the sleeve 61. First, the mounting cylinder 60 is rotated to make it close to the edge of the strain sensor body 50, and the pressure probe 62 is fixed to the end of the mounting cylinder 60 through the sleeve 61. The connecting line is led out from the wiring groove 63, and the mounting cylinder 60 is rotated to make the pressure probe 62 abut against the edge of the strain sensor body 50.

[0031] Working principle: Step 1: The adjusting rod 32 adjusts the distance between the upper clamping plate and the lower clamping plate 30 to firmly clamp the strain sensor body 50; Step 2: The rotating cylinder 40 is rotated to a suitable angle, and the mounting cylinder 60 is rotated to make it close to the edge of the strain sensor body 50. The pressure probe 62 is fixed to the end of the mounting cylinder 60 through the sleeve 61. The connecting line of the strain sensor body 50 is led out from the wiring groove 63. The mounting cylinder 60 is rotated to make the pressure probe 62 abut against the edge of the strain sensor body 50; Step 3: The hydraulic cylinder 14 causes the pressure plate 13 to drive the pressure head 11 to move downward, and the pressure head 11 applies a force to the strain sensor body 50. The value displayed by the pressure probe 62 remains unchanged, indicating that the strain sensor There is no deformation between the device body 50 and the clamp seat 33, and the value displayed by the strain sensor body 50 is accurate. When the value displayed by the pressure probe 62 changes, it means that the clamping is not firm and the calibration value of the strain sensor body 50 is inaccurate. The strain sensor body 50 needs to be refixed; Step 4: The screw 71 is rotated by driving the motor 70 and the conveyor belt 72, the movable plate 20 moves laterally, and the pressure head 11 applies a force to the strain sensor body 50, and the strain sensor body 50 is repeatedly calibrated at different positions; It should be noted here that the relative position between the strain sensor body 50 and the clamp seat 33 can also be changed, and the strain sensor body 50 can be repeatedly calibrated at different positions.

Claims

1. A high-precision automatic calibration platform for strain sensors, comprising a base (10), characterized in that: The top of the base (10) is provided with a movable plate (20) slidably connected along its length direction, and the movable plate (20) is provided with a notch (21) at both ends along the width direction of the top of the base (10), and a clamping seat (33) fixed to the top of the movable plate (20) is provided on one side of the notch (21), and a strain sensor body (50) is clamped between the two clamping seats (33), and a pressure head (11) is provided above the strain sensor body (50), and both side walls of the strain sensor body (50) are abutted against pressure probes (62) rotatably mounted on the clamping seat (33).

2. A high-precision automatic calibration platform for strain sensors as claimed in claim 1, characterized in that: A guide column (12) is fixed on the top of the base (10), a top plate is fixed on the top of the guide column (12), an inverted hydraulic cylinder (14) is installed on the top of the top plate, a pressure plate (13) slidably connected to the guide column (12) is fixed on the output end of the hydraulic cylinder (14), a pressure head (11) is fixedly connected to the bottom center of the pressure plate (13), and an avoidance channel (15) located directly above the notch (21) is provided at the bottom of the pressure plate (13).

3. A high-precision automatic calibration platform for strain sensors as claimed in claim 2, characterized in that: The side wall of the movable plate (20) is threadedly connected with a screw rod (71) arranged along the length direction of the top of the base (10), and a driving motor (70) and a conveyor belt (72) for driving the screw rod (71) to rotate are fixed to the top of the base (10).

4. A high-precision automatic calibration platform for strain sensors as claimed in claim 3, characterized in that: The clamping seat (33) comprises a lower clamping plate (30) fixed to the top of the movable plate (20), an upper clamping plate arranged parallel to the upper part of the lower clamping plate (30), and an adjusting rod (32) connecting the upper clamping plate and the lower clamping plate (30), wherein the adjusting rod (32) passes through the upper clamping plate and is rotatably connected thereto, and the bottom of the adjusting rod (32) is threadedly connected to the top of the lower clamping plate (30), and anti-slip pads are fixed to the outer walls of the upper clamping plate and the lower clamping plate (30) that are close to each other.

5. A high-precision automatic calibration platform for strain sensors as claimed in claim 4, characterized in that: The side walls of the two lower clamping plates (30) that are away from each other are each provided with a second notch (31) located above the first notch (21); the vertical section of the second notch (31) is an inverted right-angled trapezoidal structure; a rotating cylinder (40) arranged toward the strain sensor body (50) is rotatably connected in the second notch (31) via a horizontally arranged rotating rod (41); a damping pad (42) is sleeved on the outer wall of the rotating rod (41); the damping pad (42) is pressed between the side walls of the second notch (31) and the rotating cylinder (40) that are close to each other.

6. A high-precision automatic calibration platform for strain sensors as claimed in claim 5, characterized in that: A mounting cylinder (60) passes through the middle of the rotating cylinder (40) and is threadedly connected thereto. A pressure probe (62) is fixed to the end of the mounting cylinder (60) through a sleeve (61). A wiring groove (63) is provided on the outer wall of the mounting cylinder (60) near the sleeve (61).

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