Force standard machine with self-calibration function

Abstract

The utility model relates to the technical field of quality standard measurement, and discloses a force standard machine with a self-calibration function, which comprises a force standard machine body, a standard weight and a weighing apparatus, the weighing apparatus is arranged at the bottom of the standard machine body, a measuring disc is arranged at the top of the standard machine body, and the standard weight is detachably arranged on the measuring disc. And a pressure head matched with the measuring disc is arranged on one surface, corresponding to the measuring disc, of the force standard machine body. According to the utility model, through the mutual cooperation of the weighing apparatus, the standard weight and the force standard machine body, the calibration of the force standard machine is realized through measuring and comparing the gravity of the standard weight and the force applied by the force standard machine body, and the calibration problem of the small-force-value force standard machine can be effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of mass standard measurement, in particular to a force standard machine with a self-calibration function. Background Art

[0002] The force value transmission system is usually a force base (standard) machine that transmits a high-accuracy standard force gauge, which is then transmitted to a force standard machine. The standard force gauge consists of a force sensor and a matching standard instrument. Limited by the manufacturing process level of small-force force sensors, it is currently difficult to find a manufacturer of small-force force sensors with high accuracy (0.01 and above) in the world. Therefore, the traceability of force standard machines below 100N has always been a problem, resulting in the inability to effectively trace small-force force standard machines below 100N. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a force standard machine with a self-calibration function.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] The utility model discloses a force standard machine with a self-calibration function, comprising a force standard machine body, standard weights and a scale, wherein the scale is placed at the bottom of the standard machine body and a measuring plate is provided at the top, the standard weights are detachably placed on the measuring plate, the force standard machine body has a pressure head matched with the measuring plate on one side corresponding to the measuring plate, the scale measures and compares the gravity of the standard weights with the force applied by the force standard machine body, thereby realizing calibration of the force standard machine, and effectively solving the calibration problem of the small force value force standard machine.

[0006] Preferably, the above also includes a basic frame, the basic frame has a calibration slot, a lifting platform is provided inside the calibration slot for lifting in the vertical direction, the weighing instrument is placed on the lifting platform, the force standard machine body is arranged at the top of the calibration slot, and the position of the weighing instrument is adjusted and positioned by the arrangement of the lifting platform.

[0007] Preferably, the center point of the standard weight has an avoidance hole for the pressure head to pass through, and the lifting platform has an assembly groove for assembling the scale. When the scale is placed in the assembly groove, the center position of the weighing disc is located on the vertical line where the pressure head is located, thereby improving the calibration accuracy.

[0008] Preferably, a notch penetrating the avoidance hole is provided on one side of the standard weight to facilitate the disassembly and assembly of the standard weight.

[0009] Compared with the prior art, the utility model has the following beneficial effects:

[0010] The utility model realizes the calibration of the force standard machine by means of the cooperation of the additional scale, standard weights and the force standard machine body, and by comparing the gravity of the standard weights with the force applied by the force standard machine body, and can effectively solve the calibration problem of the small force value force standard machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 It is a structural schematic diagram of the standard weight of the utility model.

[0013] Illustration symbols: 1. Scale, 11. Weighing plate, 2. Standard weight, 21. Avoidance hole, 22. Notch, 3. Force standard machine body, 31. Pressure head, 4. Basic frame, 41. Calibration slot, 5. Lifting platform. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0015] like Figure 1 A force standard machine with a self-calibration function is shown, comprising a force standard machine body 3, a standard weight 2 and a scale 1. The scale 1 is placed at the bottom of the standard machine body 3, and has a measuring plate 11 on the top. The standard weight 2 is detachably placed on the measuring plate 11. The force standard machine body 3 has a pressure head 31 that cooperates with the measuring plate 11 on one side corresponding to the measuring plate 11, which can effectively solve the calibration problem of small force value force standard machines.

[0016] In some embodiments, the above also includes a basic frame 4, which has a calibration slot 41. A lifting platform 5 is provided inside the calibration slot 41 for lifting in a vertical direction. The weighing instrument 1 is placed on the lifting platform 5, and the force standard machine body 3 is arranged on the top of the calibration slot 41.

[0017] The calibration method of the force standard machine with self-calibration function is to measure the gravity of the standard weight 2 and the force applied by the pressure head 31 by the scale 1, and calibrate the force standard machine body 3 by cyclically comparing the gravity of the standard weight 2 and the force applied by the pressure head 31. Specifically, the cyclic comparison method adopts one of the following two methods:

[0018] Method 1: ABBA cycle;

[0019] Method 2: ABA cycle;

[0020] Wherein, A is the gravity of the standard weight 2 , and B is the force applied by the pressure head 31 .

[0021] During implementation, when the circulation method of method 1 is adopted, the force value error of the force standard machine body 1 is calculated by the following formula:

[0022] When the circulation method of method 2 is adopted, the force value error of the force standard machine body 1 is calculated by the following formula

[0023]

[0024] Where ΔI is the force error, I r1 The value indicated by the scale 1 when the standard weight is first loaded. r2 The value indicated by the scale 1 when the standard weight is loaded for the second time, I t1 is the value indicated by the scale 1 when the indenter 31 is first loaded, I t2 This is the value displayed by the weighing instrument when the pressure head 31 is loaded on the weighing instrument 1 for the second time.

[0025] Taking the ABA cycle as an example, during the calibration process, the scale 1 is stably placed on the center of the lifting platform 5, and the lifting platform 5 is lifted to a suitable position so that the pressure head of the force standard machine body 3 can press on the weighing plate 11 of the scale 1 under the correct working condition, and then the pressure head 31 is adjusted to the center of the weighing plate 11 of the scale 1, and one or more standard weights 2 are placed at the center of the weighing plate 11. After stabilization, the display value of the scale 1 is read, and then the standard weight 2 is removed. The pressure head 31 of the force standard machine is loaded on the weighing plate 11 of the scale 1, and the display value of the scale 1 is read after stabilization and the force standard machine is unloaded, and then the standard weight 2 is placed on the weighing plate 11 again, and the display value of the scale 1 is read after stabilization and the standard weight 2 is removed, thereby completing a complete measurement. The force display value of the force standard machine body 3 loading the pressure head 31 on the scale 1 is the measured value, and the average value of the standard weight 2 loaded twice on the scale 1 is used as the standard value. The measured value is compared with the standard value to obtain the error of the force value measurement point of the force standard machine. The scale 1 needs to be leveled and calibrated before use.

[0026] Taking the ABBA cycle as an example, during the calibration process, the scale 1 is stably placed at the center of the lifting platform 5, and the lifting platform 5 is lifted to a suitable position so that the pressure head of the force standard machine body 3 can press on the weighing plate 11 of the scale 1 under the correct working condition, and then the pressure head 31 is adjusted to the center of the weighing plate 11 of the scale 1, and one or more standard weights 2 are placed at the center of the weighing plate 11. After stabilization, the display value of the scale 1 is read, and then the standard weight 2 is removed. Then, the pressure head 31 is loaded on the weighing plate 11 twice in succession and the force value of the applied force is read, and finally, the standard weight 2 is loaded on the weighing plate 11 again, and the display value of the scale 1 is read after stabilization and the standard weight 2 is removed, thereby completing a complete measurement. The average value of the display value of the pressure head 31 loaded twice on the scale 1 is the measured value, and the average value of the display value of the scale 1 loaded twice by the weight is used as the standard value. The measured value is compared with the standard value to obtain the error of the force value measurement point of the force standard machine.

[0027] In addition, in some embodiments, a direct comparison method can also be used, that is, a weighing instrument that meets the requirements of the traceability system is used, and the weighing instrument has been verified or calibrated by the metrology verification department and is within the validity period of the traceability certificate. The weighing instrument 1 is stably placed at the center of the lifting platform 5, and the lifting platform 5 is lifted to a suitable position so that the pressure head 31 of the force standard machine body 3 can be pressed at the center of the weighing disk 11 of the weighing instrument 1 under the correct working condition. The force standard machine is loaded to the corresponding force value detection point, and the display value of the weighing instrument 1 is directly read. The load value of the force standard machine at this measurement point is directly compared with the display value of the weighing instrument 1 to obtain the error of the force standard machine at this force value measurement point.

[0028] As a preferred solution of the above embodiment, Figure 2 As shown, the center point of the standard weight 2 has an avoidance hole 21 for the pressure head 31 to pass through, so that the force applied by the pressure head 31 can be loaded to the center position of the weighing disk 11, and at the same time can also serve the purpose of positioning the standard weight 2.

[0029] As a preferred solution of the above embodiment, a notch 22 penetrating the avoidance hole 21 is provided on one side of the standard weight 2. When the force of the pressure head 31 is directly loaded onto the weighing plate 11, the notch 22 is provided to facilitate the disassembly and assembly of the standard weight 2.

[0030] As a preferred solution of the above embodiment, the lifting platform 5 has an assembly groove for assembling the weighing instrument 1. When the weighing instrument 1 is placed in the assembly groove, the center position of the weighing plate 11 is located on the vertical line where the pressure head 31 is located, so that the weighing instrument 1 is placed stably on the lifting platform 5, and at the same time, it is ensured that the force applied by the pressure head 31 can be loaded to the center position of the weighing plate 11.

[0031] In summary, the force standard machine and calibration method with self-calibration function disclosed in the utility model take the value of the standard weight 2 as the standard, take the matching scale 1 as the display reading device, and use the comparison method to realize the force value traceability of the force standard machine body 3. Since the mass of the available weights can reach 1 mg, and the maximum allowable error of the force weight corresponding to the minimum range of the force standard machine is also less than 0.001%, and the scale 1 used for comparison of mass can also fully meet the required accuracy level requirements within a small range, it means that the use of weights as a standard device meets the value transfer requirements. Therefore, the structure disclosed in this application can effectively solve the calibration problem of small force standard machines, and can also be extended to the force calibration of other force standard machines, solving the problems existing in the force calibration of existing force standard machines.

[0032] Of course, the present invention may have many other implementation modes. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A force standard machine with a self-calibration function, comprising a force standard machine body (3), characterized in that: The force standard machine also comprises a standard weight (2) and a weighing device (1), wherein the weighing device (1) is placed at the bottom of the standard machine body (3) and has a weighing plate (11) on the top, the standard weight (2) is detachably placed on the weighing plate (11), and the force standard machine body (3) has a pressure head (31) on one side corresponding to the weighing plate (11) and matched with the weighing plate (11).

2. The force standard machine with self-calibration function according to claim 1, characterized in that: The invention also comprises a basic frame (4), wherein the basic frame (4) has a calibration groove (41), wherein a lifting platform (5) capable of being lifted and lowered in a vertical direction is arranged inside the calibration groove (41), wherein the weighing instrument (1) is placed on the lifting platform (5), and the force standard machine body (3) is arranged on the top of the calibration groove (41).

3. The force standard machine with self-calibration function according to claim 2, characterized in that: The center point of the standard weight (2) has an avoidance hole (21) for the pressure head (31) to pass through.

4. The force standard machine with self-calibration function according to claim 3, characterized in that: A notch (22) penetrating the avoidance hole (21) is provided on one side of the standard weight (2).

5. The force standard machine with self-calibration function according to any one of claims 2 to 4, characterized in that: The lifting platform (5) is provided with an assembly groove for assembling the weighing instrument (1). When the weighing instrument (1) is placed in the assembly groove, the center position of the weighing plate (11) is located on the vertical line where the pressure head (31) is located.

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