Small weighing instrument with automatic calibration function

Abstract

The utility model relates to the technical field of weighing instrument calibration, and discloses a small-sized weighing instrument with an automatic calibration function, which comprises a plurality of supporting columns which are uniformly and slidably arranged right below a weighing instrument, and a plurality of driving motors are fixedly arranged in the weighing instrument. The power output ends of the multiple driving motors are fixedly provided with threaded rods used for moving the multiple supporting columns, and one ends of the multiple pressure sensors are fixedly connected with the bottoms of the multiple supporting columns. According to the utility model, through the mutual cooperation of the above parts, the numerical values of the four pressure sensors can be compared in real time and the driving motor is controlled to rotate until the numerical values of the four pressure sensors are the same, and then the rotating driving motor is powered off through the control module, thereby achieving the purpose of calibrating the weighing instrument. And the gravity center direction of the medicine is vertical to the top of the weighing instrument, so that deviation between the measured weight of the medicine and an actual value is prevented, and accurate proportioning of medicine raw materials is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of weighing instrument calibration, in particular to a small weighing instrument with an automatic calibration function. Background Technique

[0002] With the continuous development of the times, China has achieved rapid development in the medical field, and breakthroughs have also been made in the production and research of drugs. Drugs are substances used to prevent, treat, and diagnose diseases. In theory, all chemical substances that can affect the physiological functions of body organs and cell metabolic activities belong to the category of drugs. Precise weighing is required during drug production.

[0003] Currently, during drug production, small weighing instruments are needed to weigh drug raw materials to ensure the accuracy of drug ratios, reduce errors, and thus guarantee the measurement accuracy of drugs. This is crucial for the quality and efficacy of drugs because the dosage and usage of drugs directly affect the treatment effect of patients. When using existing drug weighing instruments, a flat ground needs to be selected, the drug proportioning table is placed on the flat ground, and then the weighing instrument is placed on the table. After the multiple legs at the bottom of the weighing instrument are in contact with the table, the drug raw materials can be weighed by the weighing instrument. The table is generally flat enough to meet the placement requirements. However, it cannot be guaranteed that the table is in a horizontal state during use. When the weighing instrument is placed on the table, the weighing instrument is prone to slight front-back or left-right tilting (the tilting angle is small, so it cannot be directly observed by the human eye), resulting in the center of gravity direction of the drug placed on the top of the weighing instrument not being perpendicular to the top of the weighing instrument, causing the weight of the drug measured by the weighing instrument to be possibly larger or smaller than the actual weight, and thus unable to accurately proportion the drug raw materials. Content of the Utility Model

[0004] To make up for the above deficiencies, the utility model provides a small weighing instrument with an automatic calibration function, aiming to solve the problems in the prior art.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A small weighing instrument with an automatic calibration function, comprising:

[0006] A weighing instrument;

[0007] A plurality of support columns, evenly and slidably installed directly below the weighing instrument. A plurality of driving motors are fixedly installed inside the weighing instrument, and the power output ends of the plurality of driving motors are fixedly installed with threaded rods for moving the plurality of support columns;

[0008] A plurality of pressure sensors are fixedly connected to the bottom of a plurality of support columns at one end. A plurality of data processing modules for processing the data of the pressure sensors are fixedly installed on the inner wall of the weighing instrument, and a numerical comparison module for comparing multiple groups of data is fixedly installed on the inner wall of the weighing instrument. A control module for controlling the start and stop of the power output ends of multiple driving motors is fixedly installed on the inner wall of the weighing instrument.

[0009] As a further description of the above technical solution:

[0010] A plurality of through holes are formed at the edge of the bottom of the weighing instrument, and a plurality of support columns are slidably installed in the inner cavities of the plurality of through holes.

[0011] As a further description of the above technical solution:

[0012] A plurality of driving motors are located directly above the plurality of through holes. Threaded holes adapted to the threaded rods are formed at the tops of the support columns, and one end of the threaded rod away from the driving motor extends into the inner cavity of the threaded hole.

[0013] As a further description of the above technical solution:

[0014] A plurality of guide bars are fixedly installed on the outer wall of the support column in a circumferential distribution, and a plurality of guide grooves adapted to the guide bars are formed on the inner walls of the plurality of through holes in a circumferential distribution.

[0015] As a further description of the above technical solution:

[0016] The length of the guide bar is greater than the height of the guide groove.

[0017] As a further description of the above technical solution:

[0018] The support column is provided with a T-shaped structure, and the large head end of the support column is located directly below the weighing instrument.

[0019] The utility model has the following beneficial effects:

[0020] In the utility model, when the weighing instrument is tilted so that the pressure values of two of the pressure sensors are less than those of the other two pressure sensors, the control module controls the power output ends of the driving motors directly above the two pressure sensors with smaller pressure values to rotate. At this time, the pressure values of the two pressure sensors with smaller values continuously increase, and the data processing module transmits the values of the four pressure sensors to the numerical comparison module. Until the pressure values of the four pressure sensors are the same, the numerical comparison module feeds back the signal to the data processing module, and then the data processing module transmits the received signal to the control module. Then the control module cuts off the power supply to the rotating driving motor, thereby achieving the purpose of calibrating the weighing instrument and making the center of gravity direction of the drug perpendicular to the top of the weighing instrument, preventing the measured weight of the drug from deviating from the actual value, and being beneficial to the accurate proportioning of drug raw materials. Description of the Drawings

[0021] Figure 1 is a perspective view of the present utility model;

[0022] Figure 2 is a sectional view of the weighing instrument of the present utility model;

[0023] Figure 3 is the present utility model Figure 2 a magnified view of the structure at A in;

[0024] Figure 4 is a plan view of the pressure sensor and the weighing instrument of the present utility model;

[0025] Figure 5 is a flow chart of the present utility model.

[0026] Legend:

[0027] 1. Weighing instrument; 2. Support column; 3. Threaded rod; 4. Data processing module; 5. Numerical comparison module; 6. Control module; 7. Guide bar; 8. Pressure sensor. Detailed Embodiment

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0029] Referring to Figures 1-5 , an embodiment provided by the present utility model: A small weighing instrument with an automatic calibration function, including:

[0030] Weighing instrument 1. When weighing drugs, place the weighing instrument 1 stably, and then place the drugs on the weighing part of the weighing instrument 1. Then, the drugs can be weighed by the weighing instrument 1 to ensure the accuracy of drug ratio and reduce errors.

[0031] Multiple support columns 2 are evenly and slidably installed directly below the weighing instrument 1. A plurality of through holes are provided at the edge of the bottom of the weighing instrument 1. The multiple support columns 2 are slidably installed in the inner cavities of the multiple through holes. Through holes are provided at positions of the weighing instrument 1 near the four corners. The four support columns 2 can move up and down along their own axis directions through the through holes, which can play a role in limiting the movement trajectory of the support columns 2.

[0032] Inside the weighing instrument 1, a plurality of driving motors are fixedly installed. At the power output ends of the plurality of driving motors, threaded rods 3 for the movement of a plurality of support columns 2 are fixedly installed. The plurality of driving motors are located directly above the plurality of through holes. Threaded holes adapted to the threaded rods 3 are provided at the tops of the support columns 2. One end of the threaded rod 3 away from the driving motor extends into the inner cavity of the threaded hole. After starting the driving motor, the threaded rod 3 can rotate along with the power output end of the driving motor, so that the support column 2 moves downward under the action of the threaded hole. At the same time, by changing the rotation direction of the power output end of the driving motor, the rotation direction of the threaded rod 3 can be adjusted, enabling the support column 2 to move upward and be fixed. However, by energizing different driving motors, the corresponding support columns 2 can be moved up and down along their own axial directions, facilitating the individual adjustment of the four support columns 2.

[0033] A plurality of guide strips 7 are fixedly installed on the outer wall of the support column 2 in a circular distribution. A plurality of guide grooves adapted to the guide strips 7 are provided on the inner walls of the plurality of through holes in a circular distribution. When the support column 2 moves up and down along its own axial direction, the guide strips 7 move in the inner cavity of the guide grooves, preventing the support column 2 from rotating synchronously with the threaded rod 3, playing a role in limiting the movement trajectory of the support column 2, and improving the stability and smoothness of the support column 2 when moving up and down along its own axial direction.

[0034] The length of the guide strip 7 is greater than the height of the guide groove, and the length of the guide strip 7 is the same as the length of the support column 2. When the support column 2 moves up and down, it can ensure that the guide strip 7 is always located inside the guide groove, limiting the support column 2 in real time.

[0035] The support column 2 is provided with a T-shaped structure, and the large-head end of the support column 2 is located directly below the weighing instrument 1, increasing the contact area between the bottom of the support column 2 and the pressure sensor 8 and improving the placement stability of the pressure sensor 8.

[0036] The driving motor controls the rotation direction of its own rotor through an H-bridge circuit. The H-bridge circuit is the most common method for controlling the direction of a DC motor and consists of four switches (usually transistors or relays). These switches can control the current flow direction at both ends of the motor. When the current flows through the motor in one direction, the motor rotates in one direction. When the current direction changes, the motor rotates in the opposite direction. By alternately changing the current direction, the reciprocating motion of the motor can be achieved.

[0037] The pressure sensor 8 (which can be directly purchased on the market, and its model is the BMA253 series) is fixedly connected to the bottom of the support column 2 at one end. In this embodiment, both the pressure sensor 8 and the support column 2 are provided with four. Pressure sensors 8 are fixedly installed at the bottoms of the four support columns 2.

[0038] In this embodiment, as Figure 4As shown, in order to accurately identify the four pressure sensors 8, the numbers of the four pressure sensors 8 are A, B, C, and D in the clockwise direction.

[0039] Four data processing modules 4 for processing the data of the pressure sensors 8 are fixedly installed on the inner wall of the weighing instrument 1 (which can be directly purchased on the market, and its model is HS8801-MA-16B, or it can be other models of data processing modules). After the weighing instrument 1 is placed on the desktop, the bottoms of the four pressure sensors 8 are in contact with the top of the desktop. At this time, the pressure sensors 8 are subjected to the pressure of the weighing instrument 1, and the four pressure sensors 8 transmit the pressure values to the data processing module 4 through the cables (which can receive and store the signals transmitted by the four pressure sensors 8, perform normalization processing, and then transmit the normalized data to the numerical comparison module 5).

[0040] A numerical comparison module 5 for comparing multiple groups of data is fixedly installed on the inner wall of the weighing instrument 1 (a product that can be directly purchased on the market, such as a 74LS85 comparator). The data transmission end of the data processing module 4 is connected to the data receiving end of the numerical comparison module 5 through a cable. The data processing module 4 transmits the signals of the four pressure sensors 8 received through the cable to the numerical comparison module 5. The numerical comparison module 5 compares the values of the four pressure sensors 8, and then transmits the comparison result back to the data processing module 4 through the cable.

[0041] Due to the improvement of manufacturing processes and product quality, the desktop used for weighing medicinal materials will not have potholes during production. However, due to the unevenness of the ground or the corresponding placement platform, the desktop is prone to slight tilting. When the weighing instrument 1 is placed on the top of the desktop, there is a situation of high and low distribution between the two adjacent support columns 2 at the bottom of the weighing instrument 1, resulting in the front-back or left-right tilting of the weighing instrument 1 during use, and thus the center of gravity of the weighing instrument 1 shifts in the tilting direction, making the pressure values of the two gravity sensors 8 below the inclined plane greater than those of the other two gravity sensors 8 (since the contact areas of the two gravity sensors 8 below or above the inclined plane with the desktop are the same, and the two gravity sensors 8 below or above the inclined plane evenly share the weight of the weighing instrument 1, so the pressures received by the two gravity sensors 8 below the inclined plane are the same, and the pressures received by the two gravity sensors 8 above the inclined plane are the same), which makes the weighing result of the weighing instrument 1 prone to deviation.

[0042] The usage method of this embodiment is as follows: When the weighing instrument 1 tilts forward, the value of the pressure sensor at the front is greater than the value of the pressure sensor at the rear, that is, the pressure received by pressure sensors A and B is greater than that received by pressure sensors C and D, and the pressure values of pressure sensors A and B are the same, and the values of pressure sensors C and D are the same. When the weighing instrument 1 tilts backward, the pressure received by pressure sensors A and B is less than that received by pressure sensors C and D, and the pressure values of pressure sensors A and B are the same, and the values of pressure sensors C and D are the same.

[0043] When the weighing instrument 1 tilts to the left, the pressure received by pressure sensors B and D is greater than that received by pressure sensors A and C, and the pressure values of pressure sensors B and D are the same, and the values of pressure sensors A and C are the same. When the weighing instrument 1 tilts to the right, the pressure received by pressure sensors B and D is less than that received by pressure sensors A and C, and the pressure values of pressure sensors B and D are the same, and the values of pressure sensors A and C are the same.

[0044] A control module 6 (a product that can be directly purchased on the market, with the model Siemens S7-200) for controlling the start and stop of the power output ends of multiple drive motors is fixedly installed on the inner wall of the weighing instrument 1. The value comparison module 5 compares the values of the four pressure sensors 8 and transmits the comparison result back to the data processing module 4 through a cable. When the values of two of the pressure sensors 8 are greater than the values of the other two pressure sensors 8, at this time, the control module 6 controls the power output ends of the drive motors directly above the two pressure sensors 8 with smaller pressure values to rotate. At this time, the support columns 2 connected to the two pressure sensors 8 with smaller values move downward. At the same time, the pressure values of the two pressure sensors 8 with smaller values continuously increase, and the values of the two pressure sensors 8 with larger pressure values continuously decrease, and the data is transmitted to the data processing module 4 in real time. The data processing module 4 transmits the values of the four pressure sensors 8 to the value comparison module 5. The value comparison module 5 continuously compares the values of the four pressure sensors 8 until the pressure values of the four pressure sensors 8 are the same. Then, the value comparison module 5 feeds back the signal to the data processing module 4. Then, the data processing module 4 transmits the received signal to the control module 6. Then, the control module 6 cuts off the power supply of the rotating drive motor, which can ensure that the values of the four pressure sensors 8 are the same, thus achieving the purpose of calibrating the weighing instrument 1 and making the center of gravity direction of the drug perpendicular to the top of the weighing instrument 1, preventing the measured weight of the drug from deviating from the actual value, and being beneficial to the accurate proportioning of drug raw materials.

[0045] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A small weighing instrument with an automatic calibration function, characterized in that: including a weighing instrument (1); a plurality of support columns (2), evenly and slidably installed directly below the weighing instrument (1), and a plurality of driving motors are fixedly installed inside the weighing instrument (1), and screw rods (3) for moving the plurality of support columns (2) are fixedly installed at the power output ends of the plurality of driving motors; a plurality of pressure sensors (8), one end of which is fixedly connected to the bottom of the plurality of support columns (2), a data processing module (4) for processing the data of the pressure sensors (8) is fixedly installed on the inner wall of the weighing instrument (1), and a numerical comparison module (5) for comparing multiple groups of data is fixedly installed on the inner wall of the weighing instrument (1), and a control module (6) for controlling the start and stop of the power output ends of the plurality of driving motors is fixedly installed on the inner wall of the weighing instrument (1).

2. The small weighing instrument with an automatic calibration function according to claim 1, characterized in that: A plurality of through holes are formed at the edge of the bottom of the weighing instrument (1), and the plurality of support columns (2) are slidably installed in the inner cavities of the plurality of through holes.

3. The small weighing instrument with an automatic calibration function according to claim 2, characterized in that: The plurality of driving motors are located directly above the plurality of through holes, a threaded hole adapted to the screw rod (3) is formed at the top of the support column (2), and one end of the screw rod (3) away from the driving motor extends into the inner cavity of the threaded hole.

4. A small weighing instrument with an automatic calibration function according to claim 1, characterized in that: A plurality of guide bars (7) are fixedly installed on the outer wall of the support column (2) in a circumferential distribution, and a plurality of guide grooves adapted to the guide bars (7) are formed on the inner walls of the plurality of through holes in a circumferential distribution.

5. The small weighing instrument with an automatic calibration function according to claim 4, characterized in that: The length of the guide bar (7) is greater than the height of the guide groove.

6. The small weighing instrument with an automatic calibration function according to claim 1, characterized in that: The support column (2) is arranged in a T-shaped structure, and the large head end of the support column (2) is located directly below the weighing instrument (1).

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