Automatic calibration device for measuring instrument

Abstract

The present invention discloses an automatic calibration device for measuring instruments, comprising: an electronic balance, on which the measuring instrument to be calibrated is placed, and used to weigh the measuring instrument to be calibrated. A liquid adding tube, the first end of which is placed in the measuring instrument to be calibrated, and the second end of which is connected to a liquid adding device; the liquid adding tube is used to guide the liquid in the liquid adding device to the measuring instrument to be calibrated; a first monitoring camera is used to monitor the position of the measuring instrument to be calibrated and the position of the liquid adding tube in the measuring instrument to be calibrated. A second monitoring camera is used to monitor the liquid level in real time. An industrial computer is used to calculate the nominal volume of the liquid in the measuring instrument to be calibrated based on the first reading information sent by the electronic balance before the liquid is added to the measuring instrument to be calibrated, and the second reading information sent by the electronic balance after the liquid is stopped in the measuring instrument to be calibrated, and to judge whether the measuring instrument to be calibrated is qualified based on the nominal volume to obtain the test result. The present invention reduces the complexity of the calibration device, improves the accuracy of the calibration of the measuring instrument, and automatically completes the calibration work.

Description

Technical Field

[0001] The invention relates to the field of capacity verification, and in particular to an automatic verification device for a measuring instrument. Background Art

[0002] With the rapid development of the biopharmaceutical industry, the business volume of common glass measuring equipment still has broad development prospects. On the other hand, since the calibration of measuring instruments requires the measurement of many items, in order to complete the growing business, the calibration staff gradually work overtime, and the labor cost also increases. For the calibration of common glass measuring instruments, traditional manual calibration will be gradually eliminated, and the calibration work in the future will definitely develop in the direction of automation and intelligence. Based on the above situation, it is urgent to study the feasibility of the automatic calibration system of glass measuring instruments.

[0003] According to investigation and research, the current calibration devices for automatic liquid adding technology all use two liquid adding pump tubes, one fast and one slow, which increases the complexity of the device; the liquid adding tubes are located above the measuring instrument to be calibrated for liquid adding, which will cause the liquid in the measuring instrument to be calibrated to splash onto the wall when adding liquid, resulting in inaccurate calibration; there is no automatic monitoring of the placement of the measuring instrument to be calibrated, which may cause calibration failure because the measuring instrument to be calibrated is not placed in the specified position; similarly, failure to monitor the position of the liquid adding tube may also cause liquid to spill out of the liquid adding tube when adding liquid, resulting in calibration failure. Summary of the invention

[0004] The object of the present invention is to provide an automatic measuring instrument calibration device, so as to reduce the complexity of the calibration device, improve the accuracy of measuring instrument calibration and automate the calibration work.

[0005] In order to achieve the above objectives, the present invention is implemented by the following technical solutions:

[0006] An automatic calibration device for a measuring instrument comprises: an electronic balance, on which the measuring instrument to be calibrated is placed, and used to weigh the measuring instrument to be calibrated. A liquid adding tube, wherein the first end of the liquid adding tube is placed in the measuring instrument to be calibrated, and the second end thereof is connected to a liquid adding device; the liquid adding tube is used to guide the liquid in the liquid adding device into the measuring instrument to be calibrated. A first lifting device, wherein the first lifting device is located on one side of the electronic balance; the liquid adding tube is arranged on the first lifting device, and the first lifting device is used to drive the liquid adding tube to reciprocate in the vertical direction so that the first end of the liquid adding tube is in a preset position. A first monitoring camera, which is arranged on one side of the measuring instrument to be calibrated, is used to monitor the position of the measuring instrument to be calibrated and the position of the liquid adding tube in the measuring instrument to be calibrated. A second monitoring camera, which is arranged on the other side of the measuring instrument to be calibrated and is flush with the liquid level in the measuring instrument to be calibrated in real time, is used to monitor the liquid level in real time. The industrial computer is used to calculate the nominal volume of the liquid in the measuring vessel to be tested based on the first reading information sent by the electronic balance before the liquid is added to the measuring vessel to be tested, and the second reading information sent by the electronic balance after the liquid is stopped from being added to the measuring vessel to be tested, and judge whether the measuring vessel to be tested is qualified based on the nominal volume to obtain the test result.

[0007] Preferably, the measuring device to be tested comprises: one of a measuring cylinder, a measuring cup and a single-scale volumetric flask or any combination thereof.

[0008] Preferably, it also includes: a bracket, located on one side of the electronic balance, for supporting and fixing the first monitoring camera.

[0009] Preferably, it also includes: a display connected to the industrial computer and used for displaying the detection results output by the industrial computer.

[0010] Preferably, it also includes: a printer, which is connected to the industrial computer and is used to print the detection results.

[0011] Preferably, the liquid adding device comprises: a water tank for storing the liquid to be added; a temperature sensor, arranged in the water tank, for detecting the temperature of the liquid in the water tank; a liquid adding pump, one end of which is connected to the water tank, and the other end of which is connected to the second end of the liquid adding pipe; a liquid adding pump controller, which is respectively connected to the liquid adding pump and the industrial computer. The liquid adding pump controller is used to control the liquid adding pump to add liquid to the measuring device to be tested through the liquid adding pipe according to the liquid adding control information sent by the industrial computer.

[0012] Preferably, when starting to add liquid to the measuring vessel to be tested, the first lifting device controls the first end of the liquid adding tube to be close to the bottom of the measuring vessel to be tested, and the liquid adding pump adds liquid to the measuring vessel to be tested at a first preset flow rate. The first lifting device controls the first end of the liquid adding tube to be below the liquid level in the measuring vessel to be tested, and continues to add liquid to the measuring vessel to be tested at the first preset flow rate until the liquid level in the measuring vessel to be tested reaches 90% to 95% of the target liquid level of the measuring vessel to be tested. The first lifting device controls the first end of the liquid adding tube to be higher than the liquid level in the measuring vessel to be tested, and the liquid adding pump adds liquid to the measuring vessel to be tested at a second preset flow rate until the liquid level in the measuring vessel to be tested reaches the target liquid level of the measuring vessel to be tested. The industrial computer controls the liquid adding pump to stop adding liquid.

[0013] Preferably, the first preset flow rate is greater than the second preset flow rate.

[0014] Preferably, the industrial computer subtracts the first reading information from the second reading information to obtain the liquid mass, calculates the nominal volume based on the liquid mass, compares the nominal volume with the volume indication of a standard measuring instrument to obtain a comparison result. If the comparison result is within a preset error range, the measuring instrument to be tested is qualified.

[0015] Preferably, the printer is used to print a qualified certificate of the measuring instrument to be tested.

[0016] The present invention has at least one of the following advantages:

[0017] The present invention uses a liquid adding pump with controllable flow rate, which reduces the complexity of the device and makes the control of the liquid adding flow rate more convenient. Secondly, by placing the liquid adding tube below the liquid level during liquid adding, the error generated during the calibration of the measuring instrument is greatly reduced, and the accuracy of the calibration of the measuring instrument is improved. Adding a monitoring camera to monitor the position of the measuring instrument to be calibrated and the position of the liquid adding tube further increases the automation of the calibration work, making the calibration of the glass measuring instrument more accurate and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of an automatic measuring instrument calibration device provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following is a further detailed description of an automatic calibration device for a measuring instrument proposed by the present invention in combination with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purposes, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the accompanying drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any modification of the structure, change in the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0020] like Figure 1 As shown, an automatic calibration device for a measuring instrument comprises: an electronic balance 114, on which a measuring instrument 102 to be calibrated is placed, and used to weigh the measuring instrument 102 to be calibrated. A liquid adding tube 103, wherein the first end of the liquid adding tube 103 is placed in the measuring instrument 102 to be calibrated, and the second end thereof is connected to a liquid adding device; the liquid adding tube 103 is used to guide the liquid in the liquid adding device to the measuring instrument 102 to be calibrated. A first lifting device 113, wherein the first lifting device 113 is located on one side of the electronic balance 114; the liquid adding tube 103 is arranged on the first lifting device 113, and the first lifting device 113 is used to drive the liquid adding tube 103 to reciprocate in the vertical direction, so that the first end of the liquid adding tube 103 is in a preset position. The preset position may be that the first end is below the liquid level, but the present invention is not limited thereto.

[0021] The first monitoring camera 100 is disposed at one side of the measuring vessel 102 to be inspected, and is used to monitor the position of the measuring vessel 102 to be inspected and the position of the liquid adding tube 103 in the measuring vessel 102 to be inspected.

[0022] The second monitoring camera 104 is disposed at the other side of the measuring vessel 102 to be inspected and is flush with the liquid level in the measuring vessel 102 to be inspected in real time, so as to monitor the liquid level in real time.

[0023] The industrial computer 111 is used to calculate the nominal volume of the liquid in the measuring vessel 102 to be tested based on the first reading information sent by the electronic balance 114 before the liquid is added to the measuring vessel 102 to be tested, and the second reading information sent by the electronic balance 114 after the liquid is stopped from being added to the measuring vessel 102 to be tested, and judge whether the measuring vessel 102 to be tested is qualified based on the nominal volume to obtain the test result.

[0024] The measuring instrument 102 to be tested includes: one of a measuring cylinder, a measuring cup and a single-mark volumetric flask or any combination thereof. It is understandable that the measuring instrument 102 to be tested can be a glass measuring instrument.

[0025] This embodiment further includes: a bracket 115 located on one side of the electronic balance 114 and used for supporting and fixing the first monitoring camera 100 .

[0026] This embodiment further includes: a display 110 , which is connected to the industrial computer 111 and is used to display the detection result output by the industrial computer 111 .

[0027] This embodiment further includes: a printer 109, which is connected to the industrial computer 111 and is used to print the detection result.

[0028] The liquid adding device includes: a water tank 107 for storing the liquid to be added. A temperature sensor 108 is arranged in the water tank 107 and is used to detect the temperature of the liquid in the water tank 107. The temperature sensor 108 sends the detected temperature to the industrial computer 111, and the industrial computer 111 receives the temperature and determines whether the temperature of the liquid is within the calibration condition range. If so, the calibration work is performed, and if not, the temperature of the liquid in the water tank 107 is continuously adjusted until it meets the calibration conditions.

[0029] The liquid adding pump 105 has one end connected to the water tank 107 and the other end connected to the second end of the liquid adding pipe 103. The liquid adding pump controller 106 is connected to the liquid adding pump 105 and the industrial computer 111 respectively. The liquid adding pump controller 106 is used to control the liquid adding pump 105 to add liquid to the measuring device 102 to be tested through the liquid adding pipe 103 at a preset flow rate according to the liquid adding control information sent by the industrial computer 111.

[0030] When liquid is added to the measuring vessel 102 to be tested, the first lifting device 113 controls the first end of the liquid adding tube 103 to be close to the bottom of the measuring vessel 102 to be tested, and the liquid adding pump 105 adds liquid to the measuring vessel 102 to be tested at a first preset flow rate. The first lifting device 113 controls the first end of the liquid adding tube 103 to be located below the liquid level in the measuring vessel 102 to be tested, and continues to add liquid to the measuring vessel 102 to be tested at the first preset flow rate until the liquid level in the measuring vessel 102 to be tested reaches 90% to 95% of the target liquid level of the measuring vessel 102 to be tested. The first lifting device 113 controls the first end of the liquid adding tube 103 to be higher than the liquid level in the measuring vessel 102 to be tested, and the liquid adding pump 105 adds liquid to the measuring vessel 102 to be tested at a second preset flow rate until the liquid level in the measuring vessel 102 to be tested reaches the target liquid level of the measuring vessel 102 to be tested. The industrial computer 111 controls the liquid adding pump 105 to stop adding liquid. The first preset flow rate is greater than the second preset flow rate.

[0031] The industrial computer 111 subtracts the first reading information from the second reading information to obtain the liquid mass, calculates the nominal volume based on the liquid mass, compares the nominal volume with the volume indication of a standard measuring instrument to obtain a comparison result. If the comparison result is within a preset error range, the measuring instrument to be tested is qualified.

[0032] For example: to put it simply, give me a 10ml measuring cylinder, add water to the 10ml mark on the measuring cylinder (the actual volume here may not be 10ml), then weigh the total weight of the water and the measuring cylinder minus the weight of the measuring cylinder, which is the weight of the water, and then calculate the actual volume of this weight of water. Subtract the actual volume of water from 10ml to get the error of the measuring cylinder, and then compare whether the error is less than the allowable error of the 10ml measuring cylinder in the calibration regulations. If it is less than, it is qualified, otherwise it is not. Different capacity measuring instruments have different allowable errors. For example, the allowable error of 5mL to 2000mL measuring instruments is ±0.05 to ±20ml.

[0033] The printer is used to print a qualified certificate of the measuring instrument to be tested.

[0034] In summary, when the device is performing the calibration work, the industrial computer 111 first reads the indication of the temperature sensor 108. If the temperature of the liquid is within the temperature specified by the calibration conditions, the first monitoring camera 100 monitors whether the measuring vessel 102 to be tested and the liquid adding tube 103 are in the specified position (for example, the liquid adding tube is located directly above the opening of the measuring vessel 102 to be tested). If the position is incorrect, the measuring vessel 102 to be tested and the liquid adding tube 103 need to be rearranged until the above two are in the specified position. Then the industrial computer 111 controls The electronic balance 114 is turned on, and the indication of the electronic balance 114 is read, that is, after the first reading information, and the indication of the electronic balance 114 is cleared, then the industrial computer 111 controls the lifting device 113 to move the liquid adding tube 103 to the measuring vessel 102 to be tested, and the industrial computer 111 sends a signal to the liquid adding pump controller 106 to control the liquid adding pump 105 to add liquid at a high flow rate (for example, a flow rate of 200ml / min-4000ml / min), and controls the second lifting device 112 to move during the liquid addition to ensure that the liquid level detection camera ( The second monitoring camera 104) looks at the liquid level, and at the same time controls the first lifting device 113 to move to ensure that the bottom of the liquid adding tube 103 is below the liquid level to prevent liquid splashing during adding liquid; the liquid is added at a fast flow rate to 90% to 95% of the target liquid level of the measuring device 102 to be tested, at this time, the bottom of the liquid adding tube 103 is controlled to be slightly higher than the liquid surface (for example, 1-2 cm above the liquid surface), and then the liquid adding pump 105 is controlled in the same way to add liquid at a slow flow rate (for example, a flow rate of 0.048 ml / min-288 ml / min), and the liquid is added to the second monitoring camera. When the liquid level monitoring device 104 reaches the target scale, the industrial computer 111 controls the liquid adding pump 105 to stop adding liquid. The industrial computer 1111 reads the current indication of the electronic balance 114, calculates the difference between the two indications of the electronic balance 114, obtains the mass of the liquid, calculates the nominal volume of the mass of the liquid under the current conditions, and compares it with the current indication of the current measuring device 102 to be tested, so as to judge whether the measuring device is within the allowable error, and thus whether the measuring device 102 to be tested is qualified. Then the industrial computer 111 controls the printer 109 to print a certificate of qualification.

[0035] The first lifting device 113 and the second lifting device 112 are both connected to the industrial computer, and the industrial computer is used to control the lifting and lowering of the first lifting device 113 and the second lifting device 112 and the lifting speed.

[0036] When adding liquid quickly, the first lifting device 113 drives the liquid adding pipe 103 to move, and places the bottom end of the liquid adding pipe 103 below the liquid level to add liquid.

[0037] The second lifting device 112 is used to drive the second monitoring camera 104 to follow the liquid surface and detect the liquid level in real time when adding liquid, and send the detected liquid level to the industrial computer 111.

[0038] The liquid adding pump 105 can adjust the flow rate under the control of the liquid adding pump controller 106, so as to control the speed of liquid adding.

[0039] This embodiment uses a liquid adding pump with controllable flow rate, which reduces the complexity of the calibration device and makes the control of the liquid adding flow rate more convenient. Secondly, when adding liquid, the liquid adding tube is placed below the liquid level to avoid liquid splashing, thereby greatly reducing the error generated during the calibration of the measuring instrument and improving the accuracy of the calibration of the measuring instrument. Adding a monitoring camera to monitor the position of the measuring instrument to be tested and the position of the liquid adding tube further increases the degree of automation of the calibration work, making the calibration of glass measuring instruments more accurate and efficient.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0041] In the description of the present invention, it should be understood that the terms "center", "height", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0042] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. An automatic measuring instrument calibration device, characterized in that: include: An electronic balance, on which the measuring device to be tested is placed, is used to weigh the measuring device to be tested; A liquid adding tube, wherein the first end of the liquid adding tube is placed in the measuring vessel to be tested, and the second end of the liquid adding tube is connected to the liquid adding device; The liquid adding pipe is used to guide the liquid in the liquid adding device to the measuring device to be tested; The liquid adding device comprises: A water tank for storing the liquid to be added; A temperature sensor is disposed in the water tank and is used to detect the temperature of the liquid in the water tank; A liquid adding pump, one end of which is connected to the water tank, and the other end of which is connected to the second end of the liquid adding pipe; A liquid adding pump controller, which is connected to the liquid adding pump and the industrial computer respectively; The liquid adding pump controller is used to control the liquid adding pump to add liquid to the measuring device to be tested through the liquid adding pipe according to the liquid adding control information sent by the industrial computer; A first lifting device, the first lifting device is located at one side of the electronic balance; the liquid adding tube is arranged on the first lifting device, and the first lifting device is used to drive the liquid adding tube to move back and forth in the vertical direction so that the first end of the liquid adding tube is in a preset position; A first monitoring camera, disposed on one side of the measuring vessel to be tested, for monitoring the position of the measuring vessel to be tested and the position of the liquid adding tube in the measuring vessel to be tested; The second monitoring camera is arranged on the other side of the measuring vessel to be inspected and is flush with the liquid level in the measuring vessel to be inspected in real time, and is used to monitor the liquid level in real time. The industrial computer is used to calculate the nominal volume of the liquid in the measuring vessel to be tested based on the first reading information sent by the electronic balance before the liquid is added to the measuring vessel to be tested, and the second reading information sent by the electronic balance after the liquid is stopped from being added to the measuring vessel to be tested, and judge whether the measuring vessel to be tested is qualified based on the nominal volume to obtain the test result.

2. The automatic measuring instrument calibration device according to claim 1, characterized in that: The measuring device to be tested comprises: one of a measuring cylinder, a measuring cup and a single-scale volumetric flask or any combination thereof.

3. The automatic measuring instrument calibration device according to claim 1, characterized in that: Also includes: The bracket is located on one side of the electronic balance and is used to support and fix the first monitoring camera.

4. The automatic measuring instrument calibration device according to claim 1, characterized in that: Also includes: A display is connected to the industrial computer and is used to display the detection results output by the industrial computer.

5. The automatic measuring instrument calibration device according to claim 1, characterized in that: Also includes: A printer is connected to the industrial computer and is used to print the test results.

6. The automatic measuring instrument calibration device according to claim 1, characterized in that: When liquid begins to be added to the measuring vessel to be tested, the first lifting device controls the first end of the liquid adding pipe to be close to the bottom of the measuring vessel to be tested, and the liquid adding pump adds liquid to the measuring vessel to be tested at a first preset flow rate; The first lifting device controls the first end of the liquid adding pipe to be located below the liquid level in the measuring vessel to be tested, and continues to add liquid into the measuring vessel to be tested at the first preset flow rate until the liquid level in the measuring vessel to be tested reaches 90% to 95% of the target liquid level of the measuring vessel to be tested; The first lifting device controls the first end of the liquid adding tube to be higher than the liquid level in the measuring vessel to be tested. The liquid adding pump adds liquid into the measuring vessel to be tested at a second preset flow rate until the liquid level in the measuring vessel to be tested reaches the target liquid level of the measuring vessel to be tested; The industrial computer controls the liquid adding pump to stop adding liquid.

7. The automatic measuring instrument calibration device according to claim 6, characterized in that: The first preset flow rate is greater than the second preset flow rate.

8. The automatic measuring instrument calibration device according to claim 7, characterized in that: The industrial computer subtracts the first reading information from the second reading information to obtain the liquid mass, calculates the nominal volume based on the liquid mass, compares the nominal volume with the volume indication of a standard measuring instrument to obtain a comparison result. If the comparison result is within a preset error range, the measuring instrument to be tested is qualified.

9. The automatic measuring instrument calibration device according to claim 5, characterized in that: The printer is used to print a qualified certificate of the measuring instrument to be tested.

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