Weighing sensor testing device and use method thereof

Abstract

A weighing sensor testing device and a use method thereof, wherein the weighing sensor testing device comprises a test bench (1) used for testing weighing sensors; an electronic display screen (4) and a bearing support (10) are mounted on the top of the test bench (1); an electric heating block is embedded in the bearing support (10), and an electric telescopic rod (6) is mounted at the top of the test bench (1); a counterweight column (5) is connected to the surface of the output end of the electric telescopic rod (6); a sorting and conveying unit (7) is mounted at the top of the test bench (1); a rejected product collection box (9) is mounted below a discharge port of the test bench (1); an accepted product collection box (8) is arranged at one side of the rejected product collection box (9); a suction water pump (3) is mounted at the bottom of the test bench (1), and a water storage tank (2) is mounted below the test bench (1). The device can perform linearity fitting tests on the weighing capabilities of weighing sensors and evaluate the impact of temperature changes on the linearity of the weighing sensors.

Description

Weighing sensor testing device and use method thereof Technical Field

[0001] The present invention relates to a weighing sensor testing device and a use method thereof, and in particular to a weighing sensor testing device and a use method thereof applied to the field of production testing of weighing sensors. Background Art

[0002] The weighing sensor is a commonly used measuring instrument, which is widely used in various weighing systems. When using the weighing sensor, it needs to be tested to ensure that it can work properly and guarantee the measurement accuracy. This includes an appearance inspection to observe whether the appearance of the weighing sensor is intact and undamaged. At the same time, check whether the connections of the various parts of the sensor are firm and there is no looseness. It also includes an inspection of the working accuracy.

[0003] The specification of Chinese invention patent CN201810907718.7 discloses a weighing sensor testing device, which solves the problem of weighing sensor testing efficiency, reduces manpower, has a small machine size, low production cost, and noiseless operation; the weighing sensor can be quickly loaded and unloaded through a loading and unloading device, and can be operated by both male and female workers, making it easy to master, and the testing efficiency is greatly improved compared with before. Although some operating steps are simplified, it is only equivalent to improving the proficiency of the testers, and there is no qualitative improvement in the testing efficiency. Therefore, a weighing sensor automatic detection method and device thereof are disclosed in Chinese invention patent CN201911231455.3, which can achieve a high degree of automation in weighing sensor detection and fast detection efficiency.

[0004] However, when the above-mentioned automatic detection method and device of the weighing sensor are working, they only detect the accuracy of the weighing weight of the weight by testing the weighing sensor at room temperature. However, when used in actual weighing, the weight fluctuation range of the weighing object is greater than the change in the number of weights. Therefore, during the detection, it is necessary to pay more attention to the accuracy of the linearity of the weighing sensor itself to ensure the accuracy of the data when the weighing sensor itself is weighing.

[0005] Summary of the Invention

[0006] In view of the above-mentioned existing technologies, the technical problem to be solved by the present invention is to conduct a comprehensive test on the linearity accuracy of the weighing sensor in combination with the influencing factor of temperature change under the premise of ensuring the accuracy of the weighing data of the weighing sensor under normal temperature environment, so as to ensure that the weighing data of the weighing sensor itself can still remain accurate when disturbed by temperature changes.

[0007] In order to solve the above problems, the present invention provides a weighing sensor testing device, including a test bench for testing the weighing sensor, an electronic display screen and a load-bearing bracket located on one side of the electronic display screen are installed on the top of the test bench, and an electric heating block is embedded in the interior of the load-bearing bracket, an electric telescopic rod is installed on the top of the test bench and is located on the rear side of the load-bearing bracket, the surface of the output end of the electric telescopic rod is connected to a counterweight column with a scale engraved on the surface through a connecting rod, a packaging and conveying unit located on one side of the load-bearing bracket is installed on the top of the test bench, a discharge port is provided inside the test bench, and a waste collection frame is installed below the discharge port, and a good product collection frame is arranged on the side of the waste collection frame away from the load-bearing bracket, a suction water pump is installed at the bottom of the test bench, a water storage tank is installed below the test bench, and the water storage tank, the suction water pump and the counterweight column are connected by a water pipe.

[0008] In the above-mentioned weighing sensor testing equipment, the weighing capacity of the weighing sensor is subjected to a linearity fitting test during the testing process of the weighing sensor. The influence of temperature change on the linearity of the weighing sensor can also be determined, thereby improving the comprehensiveness of the performance testing of the weighing sensor by this testing equipment.

[0009] As a further improvement of the present application, a drive motor is installed at the bottom of the test bench, and the output end of the drive motor is connected to the bottom of the electric telescopic rod, and the top of the load-bearing bracket is flush with the top of the packaging and conveying unit.

[0010] As a further improvement of the present application, the weight of the counterweight column is a fixed value, and the connecting rod and the counterweight column are connected by a rope, and the interior of the counterweight column is hollow.

[0011] As a further improvement of the present application, the packaging and conveying unit includes a first conveying frame fixedly mounted on the top surface of the test bench and a second conveying frame slidably connected to the top surface of the test bench. Axles are installed inside the first conveying frame and the second conveying frame, and the axle rod in the first conveying frame is located above the side of the axle rod in the second conveying frame. In the initial state, the second conveying frame is located above the port on the side of the discharge port away from the good product collection frame.

[0012] As a further improvement of the present application, micro electric extension rods are installed near the top of the surfaces of the first conveyor rack and the second conveyor rack that are close to each other, and several expansion conveyor rods are arranged between the first conveyor rack and the second conveyor rack, and the ends of each adjacent expansion conveyor rod are movably connected to a cover ball, the surfaces of the two adjacent cover balls are connected by a series rope and the two ends of the series rope are respectively connected to the surfaces of the first conveyor rack and the second conveyor rack, and the height of the multiple expansion conveyor rods decreases along the direction of the second conveyor rack after the series rope is straightened.

[0013] As a further improvement of the present application, an electric contact piece is installed on the top of the load-bearing bracket, and the electric contact piece is electrically connected to the electronic display screen and the weighing sensor.

[0014] As another improvement of the present application, the top surface of the test bench is also installed with a replacement load-bearing suction cup for replacing the load-bearing bracket, and the replacement load-bearing suction cup is made of high-temperature resistant material, and an electromagnetic valve is installed inside the replacement load-bearing suction cup, and an electromagnetic block and an inner column located above the electromagnetic block are installed inside the replacement load-bearing suction cup, and a receiving groove with an inverted convex cross-section is provided inside the inner column, and a magnetic rolling ball that repel each other with the electromagnetic block is installed inside the receiving groove, and a heating ring is embedded in the top of the inner column.

[0015] As another improved supplement to the present application, the surface of the magnetic roller is connected to a restraining rope through a movable part, and the bottom of the restraining rope is connected to the surface of the electromagnetic block, the electromagnetic block is electrically connected to the solenoid valve, and the top of the inner column is lower than the top of the replacement load-bearing suction cup.

[0016] As another improvement of the present application, a method for using a weighing sensor testing device includes the following steps:

[0017] S1. Before testing, place the load cell on the surface of the load-bearing bracket, place the counterweight column on the surface of the load cell, and at this time, the rope between the connecting rod and the counterweight column is in a relaxed state. Read whether the weighing amount is equal to the fixed value of the counterweight column's own weight. If the weighing amount is equal to the fixed value of the counterweight column's own weight, proceed to S2; otherwise, proceed to S31.

[0018] S2. Use the suction water pump to repeatedly inject water into the counterweight column, and record the reading of the load cell after each injection of water. Use the electronic display to mark the linearity and make a fitting plot to check whether the load cell is in a normal linear state.

[0019] S21, if it is in a normal linear relationship, start the electric heating block in the load-bearing bracket, repeat S2, and check whether the weighing sensor is in a normal linear state after heating. If it is still in a normal linear state, enter S3. If it is in an abnormal linear state, enter S3;

[0020] S3. Rotate and retract the electric telescopic rod, and use the counterweight column to push the load cell with abnormal linearity along the surface of the packaging conveyor unit into the waste collection frame;

[0021] S31. Rotate and retract the electric telescopic rod, and use the counterweight column to push the weighing sensor in a normal linear state into the good product collection frame with the assistance of the packaging conveying unit.

[0022] To sum up, when conducting the test processing of the weighing sensor, the present invention first uses the multiple water injection design to perform a linear fitting test on the weighing capacity of the weighing sensor. Compared with the traditional method of using two to three weights to single-test the weighing test capacity of the weighing sensor, it has a more refined detection effect. In addition, during the weighing test, the weighing sensor can be heated to determine the impact of temperature changes on the linearity of the weighing sensor, further improving the comprehensiveness of the performance detection of the weighing sensor of this detection equipment. In addition, during the detection, the relaxation processing of the packaging and conveying unit can be used to convey the weighing sensor to the good product collection box or the waste collection box respectively to achieve classification and sorting. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic diagram of the overall appearance structure of the first and second embodiments of the present application;

[0024] FIG2 is a schematic diagram of the installation of a test bench and a load-bearing bracket according to the first embodiment of the present application;

[0025] FIG3 is a schematic diagram of the installation of the subpackaging and conveying unit according to the first embodiment of the present application;

[0026] FIG4 is a cross-sectional view of the subpackaging and conveying unit according to the first embodiment of the present application;

[0027] FIG5 is a schematic diagram of the first embodiment of the present application showing a rotating and retracting electric telescopic rod waiting to push a counterweight column;

[0028] FIG6 is a schematic diagram of the state in which the electric telescopic rod drives the counterweight column to push the weighing sensor into the waste collection frame according to the first embodiment of the present application;

[0029] FIG7 is a schematic diagram of the state in which the electric telescopic rod drives the counterweight column to push the weighing sensor into the good product collection frame according to the first embodiment of the present application;

[0030] FIG8 is a schematic diagram comparing the linearity of the weighing sensor in the first embodiment of the present application in normal and abnormal states;

[0031] FIG9 is a schematic diagram of the structure of a replacement load-bearing suction cup according to the second embodiment of the present application;

[0032] FIG10 is a cross-sectional view of a replacement load-bearing suction cup according to a second embodiment of the present application;

[0033] FIG11 is a schematic diagram of the working state of the replacement load-bearing suction cup of the second embodiment of the present application.

[0034] Description of the numbers in the figure:

[0035] 1. Test bench; 2. Water storage tank; 3. Suction pump; 4. Electronic display screen; 5. Counterweight column; 6. Electric telescopic rod; 7. Packaging and conveying unit; 71. First conveying rack; 72. Second conveying rack; 73. Micro electric telescopic rod; 74. Expansion conveying rod; 75. Serial rope; 8. Good product collection frame; 9. Scrap collection frame; 10. Load-bearing bracket; 11. Replacement load-bearing suction cup; 111. Inner column; 112. Heating ring; 113. Magnetic roller ball; 114. Solenoid valve; 115. Solenoid block; 116. Constraint rope. DETAILED DESCRIPTION

[0036] The following describes two implementation methods of the present application in detail with reference to the accompanying drawings.

[0037] The first implementation method:

[0038] Figure 1-8 shows a weighing sensor testing equipment, including a test bench 1 for testing weighing sensors, an electronic display screen 4 and a load-bearing bracket 10 located on one side of the electronic display screen 4 are installed on the top of the test bench 1, and an electric heating block is embedded in the interior of the load-bearing bracket 10, an electric telescopic rod 6 is installed on the top of the test bench 1 and is located on the rear side of the load-bearing bracket 10, and the surface of the output end of the electric telescopic rod 6 is connected to a counterweight column 5 with a scale engraved on the surface through a connecting rod, a packaging and conveying unit 7 is installed on the top of the test bench 1 and is located on one side of the load-bearing bracket 10, a discharge port is provided inside the test bench 1, and a waste collection frame 9 is installed below the discharge port, and a good product collection frame 8 is arranged on the side of the waste collection frame 9 away from the load-bearing bracket 10, a suction water pump 3 is installed at the bottom of the test bench 1, a water tank 2 is installed below the test bench 1, and the water tank 2, the suction water pump 3 and the counterweight column 5 are connected by a water pipe.

[0039] A driving motor is installed at the bottom of the test bench 1 , and the output end of the driving motor is connected to the bottom of the electric telescopic rod 6 , and the top of the load-bearing bracket 10 is flush with the top of the subpackaging and conveying unit 7 .

[0040] The weight of the counterweight column 5 is a fixed value, and the connecting rod and the counterweight column 5 are connected by a rope body, and the interior of the counterweight column 5 is hollow.

[0041] An electric contact piece is installed on the top of the load-bearing bracket 10, and the electric contact piece is electrically connected to the electronic display screen 4 and the weighing sensor.

[0042] Specifically, during the test, the load cell is placed on the surface of the load-bearing bracket 10, ensuring that the electrical contact piece and the load cell maintain a good electrical connection state, so as to ensure that the data read by the load cell during weighing can be transmitted to the electronic display screen 4, and converted into corresponding electrical signals for drawing processing by the data processing program in the electronic display screen 4;

[0043] If the load cell has a linearity problem, the weight readings will be normal when multiple weights are placed together, but abnormalities will occur if the weighing quantity is within the weight value range of multiple weights (for example, when the linearity is normal, a 100g weight weighs 100g, a 500g weight weighs 500g, and a 325g weight weighs 325g, and the correlation coefficient in the linear relationship drawn is 1, as shown in Figure 8(a). If the linearity is abnormal, the 100g weight weighs 100g, the 500g weight weighs 500g, and the 325g weight weighs 322g, resulting in the correlation coefficient in the linear relationship drawn not being equal to 1, as shown in Figure 8(b)).

[0044] During the test, first determine whether the linearity of the weighing sensor at room temperature is normal. If not, it needs to be transferred to the waste collection box 9. If normal, use the electric heating block in the load-bearing bracket 10 to heat the weighing sensor to determine whether the linearity of the weighing sensor is normal after heating. If the linearity of the weighing sensor is abnormal after heating, it indicates that the weighing sensor is waste and needs to be transferred to the waste collection box 9. If the linearity of the weighing sensor is normal after the heating test, it is transferred to the good product collection box 8.

[0045] When transferring the weighing sensor to the scrap collection box 9 or the good product collection box 8, the driving motor is used to drive the electric telescopic rod 6 to rotate to the outside of the weighing sensor and then retract the electric telescopic rod 6, and then reverse it again, so that the counterweight column 5 can push the weighing sensor to the packaging and conveying unit 7, and then it is sent to the scrap collection box 9 or the good product collection box 8 for classification and selection.

[0046] The packaging conveying unit 7 includes a first conveying frame 71 fixedly installed on the top surface of the test bench 1 and a second conveying frame 72 slidably connected to the top surface of the test bench 1. Axles are installed inside the first conveying frame 71 and the second conveying frame 72, and the axle rod inside the first conveying frame 71 is located above the side of the axle rod inside the second conveying frame 72. In the initial state, the second conveying frame 72 is located above the port on the side of the discharge port away from the good product collection frame 8.

[0047] Micro electric extension rods 73 are installed near the top of the surfaces of the first conveyor rack 71 and the second conveyor rack 72 that are close to each other. Several expansion conveyor rods 74 are arranged between the first conveyor rack 71 and the second conveyor rack 72, and the ends of each adjacent expansion conveyor rod 74 are movably connected to a cover ball. The surfaces of the two adjacent cover balls are connected by a serial rope 75 and the two ends of the serial rope 75 are respectively connected to the surfaces of the first conveyor rack 71 and the second conveyor rack 72. After the serial rope 75 is straightened, the height of the multiple expansion conveyor rods 74 decreases along the direction of the second conveyor rack 72.

[0048] Specifically, if the load cell is transferred to the waste collection frame 9, the micro electric extension rod 73 does not need to be activated, so that the load cell can automatically roll down along the shaft between the first transfer rack 71 and the second transfer rack 72 in the slope design state to the waste collection frame 9;

[0049] If it is necessary to transfer it to the good product collection frame 8, start the micro-electric extension rod 73 to straighten the serial rope 75 and make the multiple expansion transmission rods 74 in the straight state cross the discharge port and form a blockage, and the second transmission rack 72 is also moved to the upper side of the good product collection frame 8. Since the expansion transmission rod 74 can rotate freely in the cover ball, when the weighing sensor moves along the expansion transmission rod 74 on the surface of the straightened serial rope 75, it can be smoothly transferred to the position of the second transmission rack 72 and transferred to the good product collection frame 8.

[0050] A method for using a weighing sensor testing device includes the following steps:

[0051] S1. Before testing, place the load cell on the surface of the load-bearing bracket 10, place the counterweight column 5 on the surface of the load cell, and at this time, the rope between the connecting rod and the counterweight column 5 is in a relaxed state. Read the weighing value to see if it is equal to the fixed value of the counterweight column 5's own weight. If the weighing value is equal to the fixed value of the counterweight column 5's own weight, proceed to S2; otherwise, proceed to S31.

[0052] S2. Under the action of the suction water pump 3, water is injected into the interior of the counterweight column 5 for multiple times, and the reading of the weighing sensor after each injection of the quantitative water is recorded one by one. The electronic display screen 4 is used to perform linear marking and fitting drawing to check whether the weighing sensor is in a normal linear state;

[0053] S21, if it is in a normal linear relationship, start the electric heating block in the load-bearing bracket 10, repeat S2, check whether the weighing sensor is in a normal linearity state after heating, if it is still in a normal linearity state, enter S3, if it is in an abnormal linearity state, enter S3;

[0054] S3, rotate and retract the electric telescopic rod 6, and use the counterweight column 5 to push the weighing sensor with abnormal linearity along the surface of the packaging conveying unit 7 into the waste collection frame 9;

[0055] S31 , rotating and retracting the electric telescopic rod 6 , using the counterweight column 5 to push the weighing sensor in a normal linearity state into the good product collection frame 8 with the assistance of the packaging and conveying unit 7 .

[0056] Second implementation method:

[0057] Figures 9-11 show that the top surface of the test bench 1 is also equipped with a replacement load-bearing suction cup 11 for replacing the load-bearing bracket 10, and the replacement load-bearing suction cup 11 is made of high-temperature resistant material. A solenoid valve 114 is installed inside the replacement load-bearing suction cup 11, and an electromagnetic block 115 and an inner column 111 located above the electromagnetic block 115 are installed inside the replacement load-bearing suction cup 11. A receiving groove with an inverted convex cross-section is provided inside the inner column 111, and a magnetic rolling ball 113 that repel each other with the electromagnetic block 115 is installed inside the receiving groove. A heating ring 112 is embedded on the top of the inner column 111.

[0058] The surface of the magnetic roller 113 is connected to a restraining cable 116 through a movable part, and the bottom of the restraining cable 116 is connected to the surface of the electromagnetic block 115. The electromagnetic block 115 is electrically connected to the electromagnetic valve 114. The top of the inner column 111 is lower than the top of the replacement load-bearing suction cup 11.

[0059] Different from the first embodiment, the load-bearing bracket 10 is replaced by a replacement load-bearing suction cup 11. Therefore, the contact between the load-bearing bracket 10 and the load cell is achieved by gravity. When the counterweight column 5 is placed in a non-central position on the surface of the load cell and close to the edge, there is a tendency to roll over, which will cause poor contact of the electric contacts and affect the accuracy of data transmission. Therefore, the replacement load-bearing suction cup 11 is used to strengthen the connection stability between the load cell and the surface of the test bench 1.

[0060] During the test, the top surface of the inner column 111 is provided with an electric feeler, which makes electrical contact with the bottom surface of the load cell and uses a replacement load-bearing suction cup 11 to achieve a stable connection. Even if the position of the counterweight column 5 is offset, it will not affect the reading. At the same time, the internal heating ring 112 can replace the electric heating block to heat the load cell.

[0061] When the load cell needs to be removed, the solenoid valve 114 is activated to break the vacuum adsorption state in the replacement load-bearing suction cup 11, and then the electromagnetic block 115 is activated to move the magnetic rolling ball 113 upward and out of the interior of the replacement load-bearing suction cup 11, so that the top of the replacement load-bearing suction cup 11 no longer contacts the bottom surface of the load cell, making it easier for the load cell to roll out on the surface of the magnetic rolling ball 113;

[0062] During the above process, the restraining rope 116 is used to limit the moving distance of the magnetic rolling ball 113 to ensure that it can fall smoothly into the receiving groove.

[0063] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A weighing sensor testing device, comprising a test bench (1) for testing a weighing sensor, characterized in that: The top of the test bench (1) is equipped with an electronic display screen (4) and a load-bearing bracket (10) located on one side of the electronic display screen (4), and an electric heating block is embedded in the interior of the load-bearing bracket (10). The top of the test bench (1) is equipped with an electric telescopic rod (6) located on the side and rear of the load-bearing bracket (10), and the surface of the output end of the electric telescopic rod (6) is connected to a counterweight column (5) with a scale on the surface through a connecting rod. The top of the test bench (1) is equipped with a counterweight column (5) located on the side and rear of the load-bearing bracket (10). The test bench (1) is provided with a packing and conveying unit (7) on one side of the load-bearing bracket (10); a discharge port is provided inside the test bench (1), and a waste collection frame (9) is installed below the discharge port; a good product collection frame (8) is arranged on the side of the waste collection frame (9) away from the load-bearing bracket (10); a suction water pump (3) is installed at the bottom of the test bench (1); a water storage tank (2) is installed below the test bench (1), and the water storage tank (2), the suction water pump (3) and the counterweight column (5) are connected by a water pipe.

2. A weighing sensor testing device according to claim 1, characterized in that: A driving motor is installed at the bottom of the test bench (1), and the output end of the driving motor is connected to the bottom of the electric telescopic rod (6). The top of the load-bearing bracket (10) is flush with the top of the subpackaging and conveying unit (7).

3. A weighing sensor testing device according to claim 1, characterized in that: The weight of the counterweight column (5) is a fixed value, and the connecting rod and the counterweight column (5) are connected by a rope body, and the interior of the counterweight column (5) is hollow.

4. A load cell testing device according to claim 1, characterized in that: The packaging conveying unit (7) includes a first conveying frame (71) fixedly mounted on the top surface of the test bench (1) and a second conveying frame (72) slidably connected to the top surface of the test bench (1), wherein shafts are installed inside the first conveying frame (71) and the second conveying frame (72), and the shaft in the first conveying frame (71) is located above the side of the shaft in the second conveying frame (72), and the second conveying frame (72) is initially located above the port on the side of the discharge port away from the good product collection frame (8).

5. A weighing sensor testing device according to claim 4, characterized in that: A micro electric extension rod (73) is installed near the top of the surfaces of the first conveying frame (71) and the second conveying frame (72) that are close to each other. A plurality of expansion conveying rods (74) are arranged between the first conveying frame (71) and the second conveying frame (72), and the ends of each adjacent expansion conveying rod (74) are movably connected to a cover ball. The surfaces of the two adjacent cover balls are connected by a connecting rope (75), and the two ends of the connecting rope (75) are respectively connected to the surfaces of the first conveying frame (71) and the second conveying frame (72). After the connecting rope (75) is straightened, the height of the plurality of expansion conveying rods (74) decreases along the direction of the second conveying frame (72).

6. The weighing sensor testing device according to claim 1, characterized in that: An electric contact piece is installed on the top of the load-bearing bracket (10), and the electric contact piece is electrically connected to the electronic display screen (4) and the weighing sensor.

7. The load cell testing device according to claim 1, characterized in that: The top surface of the test bench (1) is also equipped with a replacement load-bearing suction cup (11) for replacing the load-bearing bracket (10), and the replacement load-bearing suction cup (11) is made of high-temperature resistant material. A solenoid valve (114) is installed inside the replacement load-bearing suction cup (11), and an electromagnetic block (115) and an inner column (111) located above the electromagnetic block (115) are installed inside the replacement load-bearing suction cup (11). A receiving groove with an inverted convex cross-section is provided inside the inner column (111), and a magnetic rolling ball (113) that repel each other with the electromagnetic block (115) is installed inside the receiving groove. A heating ring (112) is embedded on the top of the inner column (111).

8. The weighing sensor testing device according to claim 7, characterized in that: The surface of the magnetic rolling ball (113) is connected to a restraining cable (116) via a movable part, and the bottom of the restraining cable (116) is connected to the surface of the electromagnetic block (115), and the electromagnetic block (115) is electrically connected to the electromagnetic valve (114). The top of the inner column (111) is lower than the top of the replacement load-bearing suction cup (11).

9. A method for using the load cell testing device according to claim 1, characterized in that: The following steps are included: S1. Before testing, place the weighing sensor on the surface of the load-bearing bracket (10), place the counterweight column (5) on the surface of the weighing sensor, and at this time, the rope between the connecting rod and the counterweight column (5) is in a relaxed state, and read whether the weighing amount is equal to the fixed value of the weight of the counterweight column (5). If the weighing amount is equal to the fixed value of the weight of the counterweight column (5), enter S2, otherwise enter S31; S2. Under the action of the suction water pump (3), water is injected into the counterweight column (5) for multiple times, and the reading of the weighing sensor after each injection of the quantitative water is recorded one by one. The electronic display (4) is used to perform linear marking and fitting drawing to check whether the weighing sensor is in a normal linear state; S21, if it is in a normal linear relationship, start the electric heating block in the load-bearing bracket (10), repeat S2, check whether the weighing sensor is in a normal linear state after heating, if it is still in a normal linear state, enter S3, if it is in an abnormal linear state, enter S3; S3, rotating and retracting the electric telescopic rod (6), using the counterweight column (5) to push the weighing sensor with abnormal linearity along the surface of the packaging and conveying unit (7) into the waste collection frame (9); S31, rotating and retracting the electric telescopic rod (6), using the counterweight column (5) to push the weighing sensor in a normal linearity state into the good product collection frame (8) with the assistance of the packaging and conveying unit (7).

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