Large weighing apparatus linear calibration device and calibration method thereof

Abstract

The invention relates to the technical field of weighing apparatus calibration, in particular to a large weighing apparatus linear calibration device and a calibration method thereof.The device comprises a large weighing apparatus, a water tank is arranged on one side of the large weighing apparatus, the water tank is defined to be located on the left side of the large weighing apparatus, a weighing container is arranged on the large weighing apparatus, and an electronic scale is arranged on the rear side of the large weighing apparatus; a standard metal measuring vessel is arranged on the electronic scale; a main water inlet pipe is arranged on the rear side of the water tank and provided with a water pump. A water inlet pipe I connected with the standard metal measuring vessel and a water inlet pipe II connected with the weighing container are arranged at the right end of the main water inlet pipe; a water outlet pipe I is arranged between the standard metal measuring vessel and the weighing container; a main water outlet pipe is arranged at the right end of the water tank; control valves are arranged on the main water inlet pipe, the water inlet pipe I, the water inlet pipe II, the water outlet pipe I and the main water outlet pipe; an equivalent standard weight is replaced by a weighing container capable of continuously adding water, so that the weight does not need to be carried frequently during the verification of the large weighing apparatus, the verification efficiency is improved, and the verification cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of weighing instrument calibration, and in particular to a linear calibration device for a large weighing instrument and a calibration method thereof. Background Art

[0002] A weighing instrument is a tool that uses Hooke's law or the principle of lever balance to measure the mass of an object. It is widely used in many fields such as industry, agriculture, commerce, scientific research, and medical care. In the industrial economy, weighing instruments provide key data for product quality control and play a decisive role in production processes and product quality. The accuracy and precision of weighing instruments are directly related to the fairness of transactions, as well as the interests of national trade, national defense development, scientific research, etc., and calibration of weighing instruments is a necessary means to ensure their accuracy.

[0003] For example, a Chinese patent document with the authorization announcement number CN114858262B discloses a method for measuring and calibrating a large-scale weighing instrument, which includes the following steps: (1) loading liquid into a closed container from the source through a second bidirectional pump, an accumulator, a pipeline, a liquid storage capsule, and a first bidirectional pump in sequence to produce an equivalent standard weight, the accuracy level of which is not lower than the M1 level; (2) placing a number of the equivalent standard weights on the carrier of the weighing instrument to be calibrated, and comparing the sum of the masses of the equivalent standard weights obtained by the weighing instrument with the sum of the actual masses of the equivalent standard weights to calibrate the weighing instrument. This method can be used to quickly produce equivalent standard weights that can be used as standard weights on site in real time, and by arranging and placing a number of equivalent standard weights on the carrier of the weighing instrument, the full-scale calibration can be carried out quickly and at low cost, effectively completing the value traceability of the weighing instrument being measured, ensuring the correctness of the calibration method, and improving the accuracy of value detection.

[0004] However, the above-mentioned large-scale scale calibration method still has certain defects during operation: 1. The above-mentioned method requires frequent transportation of equivalent standard weights during operation, and each equivalent standard weight must be calibrated and qualified before it can be used, which makes the calibration workload large and the calibration efficiency low; 2. Carrying a large number of equivalent standard weights requires multiple cranes and calibration vehicles, so this calibration method has a high calibration cost. Summary of the invention

[0005] The present invention provides a linear calibration device for a large weighing instrument to solve the technical problems of low calibration efficiency and high calibration cost caused by large calibration workload of existing large weighing instruments; the present invention also aims to provide a calibration method for the linear calibration device for a large weighing instrument.

[0006] In order to solve the above problems, the present invention provides a large weighing instrument linear calibration device adopts the following technical solutions: A linear calibration device for a large weighing scale comprises a large weighing scale, a water tank is arranged on one side of the large weighing scale, the water tank is defined to be located on the left side of the large weighing scale, a weighing container is arranged on the large weighing scale, an electronic scale is arranged on the rear side of the large weighing scale, and a standard metal measuring device for determining a unit water addition amount is arranged on the electronic scale; A main water inlet pipe is provided at the rear side of the water tank, and a water pump is provided on the main water inlet pipe; water inlet pipe 1 and water inlet pipe 2 are provided at the right end of the main water inlet pipe, the right end of water inlet pipe 1 is connected to a standard metal measuring vessel, and the right end of water inlet pipe 2 is connected to a weighing container; a water outlet pipe 1 is provided between the standard metal measuring vessel and the weighing container, and a main water outlet pipe connected to the weighing container is provided at the right end of the water tank; The main water inlet pipe, the first water inlet pipe, the second water inlet pipe, the first water outlet pipe and the main water outlet pipe are all provided with control valves.

[0007] Its beneficial effects are: by replacing equivalent standard weights with weighing containers that can be continuously filled with water, the calibration of large weighing instruments does not require frequent handling of weights, thereby improving the calibration efficiency of large weighing instruments and reducing the labor intensity and calibration costs of operators; in addition, the setting of standard metal measuring instruments improves the accuracy of the amount of water injected into the weighing container at a single time, thereby improving the calibration accuracy of large weighing instruments.

[0008] Furthermore, the control valve on the main water inlet pipe includes gate valves located at the left and right ends of the water pump, and a check valve is provided between the water pump and the gate valve at the right end.

[0009] The beneficial effect is that the setting of the check valve can ensure the stable and unidirectional flow of water in the connecting pipe, thereby improving the accuracy of the verification.

[0010] Furthermore, the control valves on the water inlet pipe 1, water inlet pipe 2 and water outlet pipe 1 are all ball valves, a bypass regulating valve is provided on the water inlet pipe 2 in parallel with the ball valve, and the control valve on the main water outlet pipe is a gate valve.

[0011] Furthermore, the standard metal measuring instrument is a first-class standard metal measuring instrument, and the electronic scale is called a high-precision electronic scale.

[0012] The beneficial effects of the linear calibration device for large weighing instruments provided by the present invention are: 1. By replacing the equivalent standard weights with a weighing container that can be continuously filled with water, the calibration of large weighing scales does not require frequent handling of weights, which improves the calibration efficiency of large weighing scales and reduces the labor intensity and calibration costs of operators. In addition, the setting of the standard metal measuring instrument improves the accuracy of the amount of water added to the weighing container at a single time, thereby improving the calibration accuracy of large weighing scales.

[0013] 2. The setting of the check valve can ensure the stable and unidirectional flow of water in the connecting pipe, thus improving the accuracy of the calibration.

[0014] In order to solve the above problems, the present invention provides a calibration method for a large weighing instrument linear calibration device, which adopts the following technical solutions: A calibration method for a linear calibration device of a large weighing instrument, the steps are as follows: a. Fill the weighing container with water through the main water inlet pipe and the second water inlet pipe, pressurize for 2 to 4 hours, empty the weighing container through the main water outlet pipe, and control the water discharge time; b. Fill the standard metal measuring vessel with water to the nominal capacity elevation through the main water inlet pipe and water inlet pipe 1, wet the measuring vessel, and empty the standard metal measuring vessel through the water outlet pipe 1 according to the determined water discharge time A; c. Weigh the mass B of the standard metal measuring vessel using an electronic scale; d. Pour water into the standard metal measuring vessel until the mass of the water is T on the electronic scale. Record the water height H in the standard metal measuring vessel, the ambient temperature W1, and the water temperature W2. Repeat the weighing three times to confirm that the weight of the water at the height H of the standard metal measuring vessel is T. e. The maximum weighing capacity of the large weighing scale is F, the total number of calibrations is n, and the standard weights are F / n. If the calibration mode of the large weighing scale is set to linear calibration, the calibration points are: F / n, 2F / n, 3F / n, ..., nF / n; f. First level calibration point F / n, load the standard weight with mass F / n on the large weighing instrument and confirm the calibration data; g. At the second level calibration point 2F / n, add water to the standard metal measuring vessel through the main water inlet pipe to a height of H, drain the water into the weighing container at a determined time A, repeat F / nT times, and confirm the calibration data; h. At the third level calibration point 3F / n, add water to the standard metal measuring vessel through the main water inlet pipe to a height of H, drain the water into the weighing container at a determined time A, repeat F / nT times, and confirm the calibration data; … i. At the nth level calibration point nF / n, add water to the standard metal measuring vessel through the main water inlet pipe to the elevation H position, and drain it into the weighing container according to the determined time A. After repeating F / nT times, confirm the calibration data and the linear calibration of the large weighing instrument is completed.

[0015] Its beneficial effects are: the method of accurately injecting water into the weighing container replaces the method of gradually adding weights on the large weighing scale, which greatly reduces the calibration cost of the traditional calibration method; in addition, maintaining the same temperature, unit water injection volume and water discharge time during the calibration process can reduce the error in the calibration process and improve the accuracy of the calibration results.

[0016] Furthermore, in the step a, before the weighing container is filled with water, a stability check is performed on the large weighing scale, including checking its zero drift and repeatability error, so as to ensure the stability of the large weighing scale during the calibration process.

[0017] The beneficial effect is that the stability check of the large weighing instrument before verification can eliminate the influence of zero drift and repeatability error on the verification result, thereby improving the accuracy of the verification result.

[0018] Furthermore, the calibration division number of the electronic scale is at least twice that of a large weighing scale.

[0019] The beneficial effects of the calibration method of a large weighing instrument linear calibration device provided by the present invention are: 1. The method of accurately injecting water into the weighing container instead of gradually adding weights to the large weighing scale greatly reduces the verification cost of the traditional verification method; in addition, maintaining the same temperature, unit water injection volume and water discharge time during the verification process can reduce the error in the verification process and improve the accuracy of the verification results.

[0020] 2. Stability check of large weighing instruments before calibration can eliminate the influence of zero drift and repeatability error on the calibration results, thus improving the accuracy of the calibration results. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 A schematic diagram of the structure of a linear calibration device for a large weighing instrument provided by the present invention; Figure 2 A schematic flow chart of a calibration method for a linear calibration device for a large weighing instrument provided by the present invention.

[0022] Description of reference numerals: 1. Large weighing scale; 2. Weighing container; 3. Water tank; 4. Electronic scale; 5. Standard metal measuring instrument; 6. Control valve; 61. Gate valve; 62. Check valve; 63. Ball valve; 64. Bypass regulating valve; 7. Connecting pipes; 71. Main water inlet pipe; 72. Water inlet pipe one; 73. Water inlet pipe two; 74. Water outlet pipe one; 75. Main water outlet pipe; 8. Water pump. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] The main idea of ​​the present invention is to replace the equivalent standard weights with a weighing container 2 that can be continuously filled with water, so that the calibration of the large weighing scale 1 does not require frequent transportation of weights, thereby improving the calibration efficiency of the large weighing scale 1 and reducing the labor intensity of the operators; in addition, the setting of the standard metal measuring instrument 5 improves the accuracy of the amount of water injected into the weighing container 2 at a single time, thereby improving the calibration accuracy of the large weighing scale 1.

[0025] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0026] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0027] Embodiment 1 of a linear calibration device for a large weighing instrument provided by the present invention: like Figure 1 As shown, the linear calibration device includes a large weighing scale 1, a weighing container 2 is provided at the upper end of the large weighing scale 1, a water tank 3 is provided on one side of the weighing container 2, the water tank 3 is defined as being located on the left side of the weighing container 2, an electronic scale 4 is also provided on the rear side of the weighing container 2, the electronic scale 4 is a high-precision electronic scale, a standard metal measuring instrument 5 is provided at the upper end of the electronic scale 4, the standard metal measuring instrument 5 is a first-class standard metal measuring instrument, a connecting pipe 7 is provided between the water tank 3, the weighing container 2 and the standard metal measuring instrument 5 to allow water to circulate between the water tank 3, the weighing container 2 and the standard metal measuring instrument 5, and a plurality of control valves 6 are provided on the connecting pipe 7 to control the flow of water.

[0028] First, the connecting pipe 7 includes a main water inlet pipe 71 located at the upper end of the water tank 3, and the right end of the main water inlet pipe 71 has a water inlet pipe 1 72 and a water inlet pipe 2 73. The water inlet pipe 1 72 is used to connect the standard metal measuring instrument 5, and the water inlet pipe 2 73 is used to connect the weighing container 2. The main water inlet pipe 71 is provided with a water pump 8, and the control valve 6 includes gate valves 61 located at the left and right ends of the water pump 8. A check valve 62 is also provided between the gate valve 61 on the right and the water pump 8 to ensure the stability and unidirectional flow of water.

[0029] In addition, a water outlet pipe 74 for discharging water into the weighing container 2 is provided between the standard metal measuring instrument 5 and the weighing container 2, and a ball valve 63 is provided on the water outlet pipe 74, the water inlet pipe 72 and the water inlet pipe 73. A bypass regulating valve 64 is provided on the water inlet pipe 73 in parallel with the ball valve 63. The bypass regulating valve 64 is used to regulate the water flow entering the weighing container 2, thereby increasing the accuracy and reliability of the calibration process; a main water outlet pipe 75 is provided between the weighing container 2 and the water tank 3, and a gate valve 61 for controlling the discharge of water from the weighing container 2 is provided on the main water outlet pipe 75.

[0030] Embodiment 2 of a linear calibration device for a large weighing instrument provided by the present invention: The main difference between it and Example 1 is: In Example 1, the control valve on the main water outlet pipe is a ball valve.

[0031] In this embodiment, the control valve on the main water outlet pipe is a gate valve or a butterfly valve.

[0032] Embodiment 1 of a calibration method for a linear calibration device for a large weighing instrument provided by the present invention: like Figure 2 As shown, the calibration method of the large weighing scale linear calibration device of the present invention is mainly implemented by the above-mentioned large weighing scale linear calibration device, and the specific steps are as follows: a. First, before calibration, the large weighing scale 1 is checked for stability, including checking zero drift and repeatability error, to ensure the stability of the large weighing scale 1 during the calibration process; then, the weighing container 2 is filled with water through the main water inlet pipe 71 and the second water inlet pipe 73, and the weighing container is pressed for 2 to 4 hours to simulate the load conditions in actual use, and then the weighing container 2 is emptied through the main water outlet pipe 75, and the water discharge time is controlled; b. Fill the standard metal measuring vessel 5 with water to the nominal capacity elevation through the main water inlet pipe 71 and the water inlet pipe 1 72, wet the standard metal measuring vessel 5, and then drain the standard metal measuring vessel 5 through the water outlet pipe 1 74 according to the determined draining time A; c. Weigh the mass B of the standard metal measuring vessel 5 by the electronic scale 4. At this time, the mass B is the sum of the mass of the standard metal measuring vessel 5 and the mass of the water stored in the standard metal measuring vessel 5, so as to eliminate the error caused by the water stored on the inner wall of the standard metal measuring vessel 5 after the water is drained; in addition, the calibration division number of the electronic scale 4 is at least twice that of the large weighing instrument 1 to ensure the accuracy of the calibration; d. Pour water into the standard metal measuring vessel 5 until the mass of the water is T on the electronic scale 4. Record the water height H in the standard metal measuring vessel 5, the ambient temperature W1, and the water temperature W2. During the verification process, keep the ambient temperature and water temperature constant to eliminate the detection error caused by temperature changes. Repeat the weighing three times, and then confirm that the weight of the water is T when the water level is at the height H of the standard metal measuring vessel 5. e. The maximum weighing of the large weighing scale 1 is F, the total number of calibrations is n, and the standard weights with a mass of F / n are provided. The calibration mode of the large weighing scale 1 is set to linear calibration, and the calibration points are: F / n, 2F / n, 3F / n, ..., nF / n; f. First level calibration point F / n, load a standard weight with a mass of F / n on the large weighing scale 1 and confirm the calibration data; g. At the second level calibration point 2F / n, add water to the standard metal measuring vessel 5 through the main water inlet pipe 71 to the position of elevation H, and drain it to the weighing container 2 according to the determined time A. Repeat F / nT times and confirm the calibration data; h. At the third level calibration point 3F / n, add water to the standard metal measuring vessel 5 through the main water inlet pipe 71 to a height of H, and drain the water to the weighing container 2 at a determined time A. Repeat F / nT times and confirm the calibration data; … i. At the nth level calibration point nF / n, water is added to the standard metal measuring vessel 5 through the main water inlet pipe 71 to a height of H, and then the water is drained to the weighing container 2 at a determined time A. After repeating F / nT times, the calibration data is confirmed. At this point, the linear calibration of the large weighing scale 1 is completed.

[0033] Embodiment 2 of a calibration method for a linear calibration device for a large weighing instrument provided by the present invention: The main difference between it and Example 1 is: In Example 1, water is used as the fluid for calibrating the large-scale weighing instrument.

[0034] In this embodiment, other liquids are used as the fluid for calibrating the large weighing instrument.

[0035] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and the like, which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0036] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A linear calibration device for a large weighing instrument, comprising a large weighing instrument, characterized in that: A water tank is provided on one side of the large weighing scale, and the water tank is defined to be located on the left side of the large weighing scale. A weighing container is provided on the large weighing scale, and an electronic scale is provided on the rear side of the large weighing scale. A standard metal measuring device for determining the unit water addition amount is provided on the electronic scale; A main water inlet pipe is provided at the rear side of the water tank, and a water pump is provided on the main water inlet pipe; water inlet pipe 1 and water inlet pipe 2 are provided at the right end of the main water inlet pipe, the right end of water inlet pipe 1 is connected to a standard metal measuring vessel, and the right end of water inlet pipe 2 is connected to a weighing container; a water outlet pipe 1 is provided between the standard metal measuring vessel and the weighing container, and a main water outlet pipe connected to the weighing container is provided at the right end of the water tank; The main water inlet pipe, the first water inlet pipe, the second water inlet pipe, the first water outlet pipe and the main water outlet pipe are all provided with control valves.

2. A linear calibration device for large weighing instruments according to claim 1, characterized in that: The control valve on the main water inlet pipe includes gate valves located at the left and right ends of the water pump, and a check valve is arranged between the water pump and the gate valve at the right end.

3. A linear calibration device for large weighing instruments according to claim 2, characterized in that: The control valves on the water inlet pipe 1, water inlet pipe 2 and water outlet pipe 1 are all ball valves, a bypass regulating valve is provided on the water inlet pipe 2 in parallel with the ball valve, and the control valve on the main water outlet pipe is a gate valve.

4. A linear calibration device for large weighing instruments according to claim 3, characterized in that: The standard metal measuring instrument is a first-class standard metal measuring instrument, and the electronic scale is called a high-precision electronic scale.

5. A calibration method for a linear calibration device of a large weighing instrument, characterized in that: The method is implemented by using the large weighing instrument linear calibration device according to any one of claims 1 to 4, and the specific steps are as follows: a. Fill the weighing container with water through the main water inlet pipe and the second water inlet pipe, pressurize for 2 to 4 hours, empty the weighing container through the main water outlet pipe, and control the water discharge time; b. Fill the standard metal measuring vessel with water to the nominal capacity elevation through the main water inlet pipe and water inlet pipe 1, wet the measuring vessel, and empty the standard metal measuring vessel through the water outlet pipe 1 according to the determined water discharge time A; c. Weigh the mass B of the standard metal measuring vessel using an electronic scale; d. Pour water into the standard metal measuring vessel until the mass of the water is T on the electronic scale. Record the water height H in the standard metal measuring vessel, the ambient temperature W1, and the water temperature W2. Repeat the weighing three times to confirm that the weight of the water at the height H of the standard metal measuring vessel is T. e. The maximum weighing capacity of the large weighing scale is F, the total number of calibrations is n, and the standard weights are F / n. If the calibration mode of the large weighing scale is set to linear calibration, the calibration points are: F / n, 2F / n, 3F / n, ..., nF / n; f. First level calibration point F / n, load the standard weight with mass F / n on the large weighing instrument and confirm the calibration data; g. At the second level calibration point 2F / n, add water to the standard metal measuring vessel through the main water inlet pipe to a height of H, drain the water into the weighing container at a determined time A, repeat F / nT times, and confirm the calibration data; h. At the third level calibration point 3F / n, add water to the standard metal measuring vessel through the main water inlet pipe to a height of H, drain the water into the weighing container at a determined time A, repeat F / nT times, and confirm the calibration data; … i. At the nth level calibration point nF / n, add water to the standard metal measuring vessel through the main water inlet pipe to the elevation H position, and drain it into the weighing container according to the determined time A. After repeating F / nT times, confirm the calibration data and the linear calibration of the large weighing instrument is completed.

6. A method for calibrating the linearity of a large weighing instrument according to claim 5, characterized in that: In the step a, before the weighing container is filled with water, the large weighing scale is subjected to a stability check, including checking its zero drift and repeatability error, so as to ensure the stability of the large weighing scale during the calibration process.

7. A method for calibrating the linearity of a large weighing instrument according to claim 6, characterized in that: The verification division number of the electronic scale is at least twice that of a large weighing scale.

Images