A refractometer calibration device

Abstract

The invention relates to the technical field of refractometers, and discloses a calibration device for a refractometer, comprising a base, a supporting cross plate being arranged above the base, a driving mechanism for driving the supporting cross plate to rise and fall being arranged on the base, a mounting cover being arranged below the supporting cross plate, the mounting cover being elastically connected to the supporting cross plate through an elastic connecting component, a mounting shaft being rotatably mounted inside the mounting cover, a first motor being fixedly mounted on one side of the mounting cover, and an output end of the first motor being fixedly connected to one end of the mounting shaft; the invention provides a plurality of drip nozzles, so that the device can drip standard liquids of different concentrations, and by dripping the standard liquid with the drip nozzle, the standard liquid can be accurately dripped onto a detection prism of a refractometer body, and when the dripped standard liquid needs to be switched, the mounting shaft is driven to rotate by the first motor to replace the drip nozzle that drips toward the refractometer body, thereby dripping different standard liquids to improve the calibration accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of refractometers, in particular to a calibration device for a refractometer. Background Art

[0002] A refractometer is a precision instrument that uses the principle of light refraction to measure the refractive index of transparent or translucent liquids and solids. It is widely used in food, chemical industry, medicine and other fields. By measuring the refractive index of a substance, one can indirectly understand its physical properties such as concentration and purity.

[0003] Refractometers often need to be calibrated after being used for a long time. During calibration, standard solutions with known refractive index are generally selected as calibration solutions. These solutions can be sucrose solutions, salt solutions or other liquids with stable chemical properties. The refractometer is calibrated at multiple points using calibration solutions of different concentrations. By comparing the differences between the measured values ​​and theoretical values ​​of calibration solutions of different concentrations, the measurement accuracy and linear range of the refractometer can be evaluated.

[0004] In the calibration process of refractometers, it is common to manually add calibration liquid drops to the detection prism. However, this method has some limitations, including the difficulty in accurately controlling the amount of calibration liquid added and ensuring that the liquid is accurately placed in the predetermined position. These problems are particularly prominent when a large number of refractometers need to be calibrated continuously. It not only increases the complexity of the operation, but also may introduce additional error sources, affecting the consistency and reliability of the final measurement results.

[0005] Therefore, it is necessary to provide a calibration device for a refractometer to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a refractometer calibration device, which can automatically and accurately drip a standard solution onto a detection prism of the refractometer to improve the calibration efficiency.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: a calibration device for a refractometer, comprising a base, a supporting cross plate is arranged above the base, a driving mechanism for driving the supporting cross plate to rise and fall is arranged on the base, a mounting cover is arranged below the supporting cross plate, the mounting cover is elastically connected to the supporting cross plate through an elastic connecting assembly, a mounting shaft is rotatably installed inside the mounting cover, a first motor is fixedly installed on one side of the mounting cover, an output end of the first motor is fixedly connected to one end of the mounting shaft, a mounting cylinder is fixedly sleeved on the mounting shaft, a plurality of drip nozzles are fixedly installed on the mounting cylinder, a liquid storage box is installed on the supporting cross plate, a plurality of liquid storage cavities are arranged in the liquid storage box, the plurality of liquid storage cavities are respectively connected to the plurality of drip nozzles through an infusion pipeline, and a plurality of gas supply mechanisms for respectively supplying gas into the plurality of liquid storage cavities are arranged on the liquid storage box.

[0008] The present invention is further configured as follows: a connecting column is fixedly installed at one end of the mounting shaft, the connecting column is rotatably connected to the mounting cover, the infusion pipeline includes a first infusion tube, a second infusion tube and a third infusion tube, one end of the first infusion tube is connected to the drip nozzle, and the first infusion tube passes through the connecting column, one end of the second infusion tube is connected to the first infusion tube, the other end of the second infusion tube is connected to the third infusion tube, and one end of the third infusion tube away from the second infusion tube is connected to the liquid storage chamber.

[0009] The present invention is further configured as follows: the elastic connection assembly includes a connecting plate, a sliding column and a first spring, the connecting plate is arranged above the supporting cross plate, the sliding column penetrates the supporting cross plate, and the sliding column and the supporting cross plate are slidably matched, the bottom end of the sliding column is fixedly connected to the mounting cover, the top end of the mounting cover is fixedly connected to the first spring, and the top end of the first spring is fixedly connected to the supporting cross plate.

[0010] The present invention is further configured as follows: the air delivery mechanism includes a cylinder, the top end of the cylinder is connected to an air inlet and an exhaust port, the top end of the exhaust port is connected to an air delivery pipe, the top end of the liquid storage chamber is connected to a connecting port, the end of the air delivery pipe away from the exhaust port is connected to the connecting port, a first one-way valve is provided in the exhaust port, a second one-way valve is provided in the air inlet, a piston is provided in the cylinder, a plug rod is fixedly installed on the bottom end of the piston, the plug rod passes through the bottom wall of the cylinder, a connecting cap is fixedly installed on the bottom end of the plug rod, a second spring is sleeved on the plug rod, the bottom end of the second spring is fixedly connected to the connecting cap, and the top end of the second spring is fixedly connected to the bottom wall of the cylinder.

[0011] The present invention is further configured as follows: a second guide rail is fixedly mounted on one side of the mounting cover, a second slide seat is slidably mounted in the second guide rail, a push plate is fixedly mounted on one side of the second slide seat, and the push plate is arranged directly below one of the connecting caps.

[0012] The present invention is further configured as follows: a third spring is arranged inside the second guide rail, one end of the third spring is fixedly connected to the second slide seat, the other end of the third spring is fixedly connected to the inner side wall of the second guide rail, a traction rope is fixedly connected to one side of the second slide seat, a traction wheel is fixedly sleeved on the connecting column, and one end of the traction rope away from the second slide seat is fixedly connected to the traction wheel.

[0013] The present invention is further configured as follows: a pressure sensor is fixedly mounted on the bottom wall of the mounting cover.

[0014] The present invention is further configured as follows: a plurality of liquid adding ports are arranged at the top of the liquid storage box, the plurality of liquid adding ports are respectively connected to a plurality of liquid storage cavities, and a sealing cover is threadedly installed at the top of the liquid adding port.

[0015] The present invention is further configured as follows: the driving mechanism includes a first guide rail, the first guide rail is fixedly installed on the top of the base, a first slide seat is slidably installed inside the first guide rail, a first screw rod is rotatably installed inside the first guide rail, the first screw rod passes through the first slide seat, and the first screw rod is threadedly connected to the first slide seat, a second motor is fixedly installed on the top of the first guide rail, and the output end of the second motor is fixedly connected to the top of the first screw rod.

[0016] The present invention is further configured as follows: a limit plate is fixedly installed on one side of the mounting cover, a plurality of through holes are opened on the limit plate, the third infusion tube passes through the through holes, the bottom wall of the limit plate is fixedly connected to a support plate, one end of the second infusion tube passes through the support plate, and the second infusion tube is fixedly connected to the support plate.

[0017] In summary, the present invention has the following beneficial effects:

[0018] 1. The present invention provides a plurality of drip nozzles so that the device can drip standard solutions of different concentrations. By using the drip nozzles to drip the standard solution, the standard solution can be accurately dripped onto the detection prism of the refractometer body. When the standard solution to be dripped needs to be switched, the first motor drives the mounting shaft to rotate to replace the drip nozzle that drips toward the refractometer body, thereby dripping different standard solutions to improve the calibration accuracy. By providing the mounting cover, when the standard solution is dripped, the dripped standard solution will not splash out of the dripping range to prevent the device from being contaminated.

[0019] 2. The present invention extrude the standard liquid by using a gas delivery mechanism to deliver gas into the liquid storage chamber. When the first spring is compressed, the gas delivery mechanism can automatically drive the drip nozzle to extrude the standard liquid. The value detected by the pressure sensor can indirectly detect the compression degree of the spring, thereby controlling the extrusion amount of the standard liquid, thereby accurately controlling the extrusion amount of the standard liquid;

[0020] 3. In the present invention, when the mounting shaft rotates to replace the drip nozzle in use, the mounting shaft rotates and drives the traction wheel to rotate through the connecting column. When the traction wheel rotates, the traction rope is wound, so that the traction rope pulls the push plate to move through the second slide seat. The traction wheel rotates 120°, and the traction rope pulls the push plate to move to the bottom of another adjacent connecting cap, so that when the push plate pushes the connecting cap to move upward, gas can be input into the liquid storage cavity connected to the drip nozzle in use, thereby realizing automatic switching of the gas supply mechanism for gas supply when the drip nozzle is replaced, and there is no need to be driven by an electrical drive element, the synchronization is good, and it is not easy to fail. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the present invention when testing the refractometer;

[0023] Figure 3 This is one of the structural schematic diagrams of the present invention after the base and the driving mechanism are removed;

[0024] Figure 4 This is the second structural schematic diagram of the present invention after the base and the driving mechanism are removed;

[0025] Figure 5 It is a schematic cross-sectional structural diagram of the liquid storage box of the present invention;

[0026] Figure 6 It is a schematic cross-sectional structure diagram of the gas transmission mechanism of the present invention;

[0027] Figure 7 It is a schematic cross-sectional structural diagram of the mounting cover of the present invention;

[0028] Figure 8 It is a schematic structural diagram of the mounting shaft, drip nozzle, connecting column and traction wheel of the present invention.

[0029] In the figure: 1, base; 2, first guide rail; 3, first slide seat; 4, first screw; 5, second motor; 6, support cross plate; 7, connecting plate; 8, mounting cover; 9, sliding column; 10, first spring; 11, mounting shaft; 12, first motor; 13, mounting cylinder; 14, drip nozzle; 15, connecting column; 16, first infusion tube; 17, second infusion tube; 18, support plate; 19, third infusion tube; 20, limit plate; 21, liquid storage box; 2101, liquid storage cavity; 2 102, connecting port; 2103, liquid adding port; 2104, sealing cover; 22, cylinder; 2201, exhaust port; 2202, air inlet; 23, piston; 24, plug rod; 25, second spring; 26, connecting cap; 27, first non-return valve; 28, second non-return valve; 29, air pipe; 30, second guide rail; 31, second slide seat; 32, push plate; 33, third spring; 34, traction rope; 35, traction wheel; 36, refractometer body; 37, pressure sensor. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention.

[0031] See also Figures 1 to 5 , Figure 7 and Figure 8In an embodiment of the present invention, a calibration device for a refractometer includes a base 1, a supporting horizontal plate 6 is arranged above the base 1, a driving mechanism for driving the supporting horizontal plate 6 to rise and fall is arranged on the base 1, a mounting cover 8 is arranged below the supporting horizontal plate 6, the bottom of the mounting cover 8 is an opening, the mounting cover 8 is elastically connected to the supporting horizontal plate 6 through an elastic connection component, a mounting shaft 11 is rotatably installed inside the mounting cover 8, a first motor 12 is fixedly installed on one side of the mounting cover 8, an output end of the first motor 12 is fixedly connected to one end of the mounting shaft 11, a mounting cylinder 13 is fixedly sleeved on the mounting shaft 11, and a plurality of drip nozzles 14 are fixedly installed on the mounting cylinder 13, Preferably three are provided, and a liquid storage box 21 is installed on the supporting cross plate 6, and a plurality of liquid storage chambers 2101 are arranged in the liquid storage box 21, and the plurality of liquid storage chambers 2101 are respectively connected with a plurality of drop nozzles 14 through liquid infusion pipelines, and a plurality of gas supply mechanisms for respectively supplying gas into the plurality of liquid storage chambers 2101 are provided on the liquid storage box 21, and different standard liquids are placed in the plurality of liquid storage chambers 2101, and the number of drop nozzles 14, liquid infusion pipelines, gas supply mechanisms and liquid storage chambers 2101 is the same, so that when the gas supply mechanism supplies gas into the liquid storage chamber 2101, under the action of air pressure, the standard liquid in the liquid storage chamber 2101 is supplied into the drop nozzle 14 through the liquid infusion pipeline, and then drips onto the detection prism on the refractometer body 36.

[0032] A connecting column 15 is fixedly installed at one end of the mounting shaft 11, and the connecting column 15 is rotatably connected to the mounting cover 8. The infusion pipeline includes a first infusion tube 16, a second infusion tube 17 and a third infusion tube 19. One end of the first infusion tube 16 is connected to the drip nozzle 14, and the first infusion tube 16 passes through the connecting column 15, one end of the second infusion tube 17 is connected to the first infusion tube 16, and the other end of the second infusion tube 17 is connected to the third infusion tube 19, and the end of the third infusion tube 19 away from the second infusion tube 17 is connected to the liquid storage chamber 2101; a limiting plate 20 is fixedly installed on one side of the mounting cover 8, and a plurality of through holes are opened on the limiting plate 20, and the third infusion tube 19 passes through the through holes The hole is fixedly connected to the bottom wall of the limiting plate 20 with a support plate 18, one end of the second infusion tube 17 passes through the support plate 18, and the second infusion tube 17 is fixedly connected to the support plate 18, the first infusion tube 16 adopts a hard tube, and the second infusion tube 17 and the third infusion tube 19 adopt soft tubes, one end of the second infusion tube 17 can be fixed by the support plate 18, and the third infusion tube 19 can be limited by the limiting plate 20 to prevent the third infusion tube 19 from being entangled, and the soft second infusion tube 17 makes it possible for the rotation of the mounting shaft 11 and the connecting column 15 to not affect the delivery of the solution, the first motor 12 is a forward and reverse motor, and the replacement drip nozzle 14 is not always unidirectionally rotating to avoid the second infusion tube 17 from being entangled.

[0033] When in use, the refractometer body 36 to be tested is placed on the base 1, and a limiting structure is provided on the base 1 to limit the refractometer body 36. Then, the driving mechanism drives the supporting cross plate 6 to move downward. When the supporting cross plate 6 moves downward, the elastic connecting assembly drives the mounting cover 8 to move downward, so that the bottom wall of the mounting cover 8 fits with the refractometer body 36. Then, gas is injected into the liquid storage cavity 2101 through the gas transmission mechanism. Under the action of gas pressure, the standard liquid in the liquid storage cavity 2101 is input into the second liquid infusion tube 17 through the third liquid infusion tube 19, and then input into the first liquid infusion tube 16 through the second liquid infusion tube 17, and finally dripped onto the detection prism of the refractometer body 36 through the drip nozzle 14. By comparing the calibration liquids of different concentrations, the standard liquid in the liquid storage cavity 2101 is measured. The difference between the measured value of the standard liquid and the theoretical value is used to evaluate the measurement accuracy and linear range of the refractometer, so as to calibrate the refractometer in a targeted manner. By setting a plurality of drip nozzles 14, the device can drip standard liquids of different concentrations. By using the drip nozzle 14 to drip the standard liquid, the standard liquid can be accurately dripped onto the detection prism of the refractometer body 36. When the dripped standard liquid needs to be switched, the first motor 12 drives the mounting shaft 11 to rotate to replace the drip nozzle 14 that drips toward the refractometer body 36, thereby dripping different standard liquids to improve the calibration accuracy. By setting the mounting cover 8, when dripping the standard liquid, the dripped standard liquid will not splash out of the dripping range to prevent the device from being contaminated.

[0034] In this embodiment, preferably, the driving mechanism includes a first guide rail 2, which is fixedly installed on the top of the base 1, and a first slide seat 3 is slidably installed inside the first guide rail 2. A first screw rod 4 is rotatably installed inside the first guide rail 2, and the first screw rod 4 passes through the first slide seat 3, and the first screw 4 is threadedly connected to the first slide seat 3. A second motor 5 is fixedly installed on the top of the first guide rail 2, and the output end of the second motor 5 is fixedly connected to the top of the first screw 4. The first screw rod 4 can be driven to rotate by the second motor 5, and when the first screw 4 rotates, it drives the first slide seat 3 to rise and fall, thereby driving the supporting cross plate 6 to rise and fall.

[0035] In this embodiment, preferably, the elastic connection component includes a connecting plate 7, a sliding column 9 and a first spring 10, the connecting plate 7 is arranged above the supporting cross plate 6, the sliding column 9 penetrates the supporting cross plate 6, and the sliding column 9 slides with the supporting cross plate 6, the bottom end of the sliding column 9 is fixedly connected to the mounting cover 8, the top end of the mounting cover 8 is fixedly connected with the first spring 10, and the top end of the first spring 10 is fixedly connected to the supporting cross plate 6; through the setting of the elastic connection component, after the mounting cover 8 contacts with the refractometer body 36, as the supporting cross plate 6 continues to move downward, the first spring 10 can be compressed, so that after the mounting cover 8 contacts with the refractometer body 36, it can play a certain buffering role to prevent the refractometer body 36 from being damaged by impact.

[0036] In this embodiment, preferably, a plurality of liquid adding ports 2103 are provided at the top of the liquid storage box 21, and the plurality of liquid adding ports 2103 are respectively connected to the plurality of liquid storage chambers 2101. A sealing cover 2104 is threadedly installed on the top of the liquid adding port 2103. After opening the sealing cover 2104, standard liquid can be added to the liquid storage chamber 2101 through the liquid adding port 2103. The liquid storage chamber 2101 remains sealed and is not connected to the outside world, so that when gas is injected into the liquid storage chamber 2101, the standard liquid in the liquid storage chamber 2101 can be squeezed out through the drip nozzle 14.

[0037] In this embodiment, preferably, a pressure sensor 37 is fixedly mounted on the bottom wall of the mounting cover 8, and the pressure sensor 37 can detect whether the pressure cover is pressed on the refractometer body 36 to be tested, thereby stopping driving the supporting cross plate 6 to move downward in time.

[0038] See also Figure 5 and Figures 6 to 8 In the embodiment of the present invention, the gas delivery mechanism includes a cylinder 22, the top of the cylinder 22 is connected with an air inlet 2202 and an exhaust port 2201, the top of the exhaust port 2201 is connected with an air delivery pipe 29, the top of the liquid storage chamber 2101 is connected with a connecting port 2102, one end of the air delivery pipe 29 away from the exhaust port 2201 is connected with the connecting port 2102, a first one-way valve 27 is arranged in the exhaust port 2201, a second one-way valve 28 is arranged in the air inlet 2202, a piston 23 is arranged in the cylinder 22, a plug rod 24 is fixedly installed at the bottom end of the piston 23, the plug rod 24 passes through the bottom wall of the cylinder 22, a connecting cap 26 is fixedly installed at the bottom end of the plug rod 24, and a second spring 25 is sleeved on the plug rod 24 The bottom end of the second spring 25 is fixedly connected to the connecting cap 26, and the top end of the second spring 25 is fixedly connected to the bottom wall of the cylinder 22; the first one-way valve 27 allows the gas in the cylinder 22 to be transported to the air pipe 29 through the exhaust port 2201, while the gas in the air pipe 29 cannot be transported to the cylinder 22; the second one-way valve 28 allows the outside gas to be input into the cylinder 22 through the air inlet 2202, while the gas in the cylinder 22 cannot be discharged through the air inlet 2202, so that when the piston 23 moves downward, the outside gas enters the cylinder 22 through the air inlet 2202, and when the piston 23 moves upward, the gas in the cylinder 22 is input into the liquid storage chamber 2101 through the air pipe 29, so that the standard liquid in the liquid storage chamber 2101 is transported to the drip nozzle 14 through the infusion pipeline.

[0039] In this embodiment, preferably, a second guide rail 30 is fixedly installed on one side of the mounting cover 8, a second slide seat 31 is slidably installed in the second guide rail 30, a push plate 32 is fixedly installed on one side of the second slide seat 31, and the push plate 32 is arranged directly below one of the connecting caps 26; a third spring 33 is arranged inside the second guide rail 30, one end of the third spring 33 is fixedly connected to the second slide seat 31, and the other end of the third spring 33 is fixedly connected to the inner side wall of the second guide rail 30, a traction rope 34 is fixedly connected to one side of the second slide seat 31, and the connecting column A traction wheel 35 is fixedly mounted on the upper part of the second slide 31, and one end of the traction rope 34 away from the second slide 31 is fixedly connected to the traction wheel 35; when the mounting cover 8 moves to contact the refractometer body 36 to be measured, as the supporting cross plate 6 continues to move downward, the distance between the supporting cross plate 6 and the mounting cover 8 gradually decreases, thereby reducing the distance between the push plate 32 and the cylinder 22, and pushing the connecting cap 26 upward through the push plate 32, thereby pushing the piston 23 upward through the plug rod 24, so that the gas in the cylinder 22 is transported to the liquid storage chamber 2101 through the gas pipe 29, thereby storing the liquid The standard liquid in the cavity 2101 is transported to the drip nozzle 14 through the infusion pipeline, and is dripped onto the detection prism of the refractometer body 36 through the drip nozzle 14, thereby realizing automatic dripping of the standard liquid. When the first spring 10 is compressed, the drip nozzle 14 can be automatically driven by the gas transmission mechanism to extrude the standard liquid. The value detected by the pressure sensor 37 can indirectly detect the compression degree of the spring, thereby controlling the extrusion amount of the standard liquid, thereby accurately controlling the extrusion amount of the standard liquid; and when the mounting shaft 11 rotates to replace the drip nozzle 14, the mounting shaft 11 rotates to drive the traction wheel through the connecting column 15 35 rotates, and the traction rope 34 is wound around the traction wheel 35 when it rotates, so that the traction rope 34 pulls the push plate 32 to move through the second slide seat 31, and the traction wheel 35 rotates 120°, and the traction rope 34 pulls the push plate 32 to move to the bottom of another adjacent connecting cap 26, so that when the push plate 32 pushes the connecting cap 26 to move upward, the gas can be input into the liquid storage chamber 2101 connected to the drip nozzle 14 in use, thereby realizing the automatic switching of the gas supply mechanism for gas supply when the drip nozzle 14 is replaced, and there is no need to be driven by an electrical drive element, the synchronization is good, and it is not easy to fail.

[0040] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A refractometer calibration device, comprising a base (1), a supporting horizontal plate (6) being arranged above the base (1), and a driving mechanism for driving the supporting horizontal plate (6) to rise and fall being arranged on the base (1), characterized in that: A mounting cover (8) is provided below the supporting transverse plate (6), the mounting cover (8) being elastically connected to the supporting transverse plate (6) via an elastic connection assembly, a mounting shaft (11) being rotatably mounted inside the mounting cover (8), a first motor (12) being fixedly mounted on one side of the mounting cover (8), an output end of the first motor (12) being fixedly connected to one end of the mounting shaft (11), a mounting cylinder (13) being fixedly sleeved on the mounting shaft (11), a plurality of drip nozzles (14) being fixedly mounted on the mounting cylinder (13), a liquid storage box (21) being mounted on the supporting transverse plate (6), a plurality of liquid storage cavities (2101) being arranged in the liquid storage box (21), the plurality of liquid storage cavities (2101) being respectively connected to the plurality of drip nozzles (14) via liquid infusion pipelines, and a plurality of gas supply mechanisms for respectively supplying gas into the plurality of liquid storage cavities (2101) are provided on the liquid storage box (21); A connecting column (15) is fixedly mounted on one end of the mounting shaft (11), and the connecting column (15) is rotatably connected to the mounting cover (8); the infusion pipeline comprises a first infusion tube (16), a second infusion tube (17) and a third infusion tube (19); one end of the first infusion tube (16) is connected to the drip nozzle (14), and the first infusion tube (16) passes through the connecting column (15); one end of the second infusion tube (17) is connected to the first infusion tube (16), and the other end of the second infusion tube (17) is connected to the third infusion tube (19); and one end of the third infusion tube (19) away from the second infusion tube (17) is connected to the liquid storage chamber (2101); The elastic connection assembly comprises a connection plate (7), a sliding column (9) and a first spring (10); the connection plate (7) is arranged above the supporting transverse plate (6); the sliding column (9) penetrates the supporting transverse plate (6), and the sliding column (9) and the supporting transverse plate (6) are slidably matched; the bottom end of the sliding column (9) is fixedly connected to the mounting cover (8); the top end of the mounting cover (8) is fixedly connected to the first spring (10); and the top end of the first spring (10) is fixedly connected to the supporting transverse plate (6); The gas delivery mechanism comprises a cylinder (22); the top end of the cylinder (22) is provided with an air inlet (2202) and an exhaust port (2201); the top end of the exhaust port (2201) is provided with an air delivery pipe (29); the top end of the liquid storage chamber (2101) is provided with a connecting port (2102); one end of the air delivery pipe (29) away from the exhaust port (2201) is connected to the connecting port (2102); a first non-return valve (27) is provided in the exhaust port (2201); the air inlet (2202) is provided with a first non-return valve (27); 2202) is provided with a second one-way valve (28), a piston (23) is provided in the cylinder (22), a plug rod (24) is fixedly mounted on the bottom end of the piston (23), the plug rod (24) passes through the bottom wall of the cylinder (22), a connecting cap (26) is fixedly mounted on the bottom end of the plug rod (24), a second spring (25) is sleeved on the plug rod (24), the bottom end of the second spring (25) is fixedly connected to the connecting cap (26), and the top end of the second spring (25) is fixedly connected to the bottom wall of the cylinder (22); A second guide rail (30) is fixedly mounted on one side of the mounting cover (8), a second slide seat (31) is slidably mounted inside the second guide rail (30), a push plate (32) is fixedly mounted on one side of the second slide seat (31), and the push plate (32) is arranged directly below one of the connection caps (26).

2. A refractometer calibration device according to claim 1, characterized in that: A third spring (33) is arranged inside the second guide rail (30), one end of the third spring (33) is fixedly connected to the second slide seat (31), the other end of the third spring (33) is fixedly connected to the inner side wall of the second guide rail (30), a traction rope (34) is fixedly connected to one side of the second slide seat (31), a traction wheel (35) is fixedly sleeved on the connecting column (15), and one end of the traction rope (34) away from the second slide seat (31) is fixedly connected to the traction wheel (35).

3. A refractometer calibration device according to claim 2, characterized in that: A pressure sensor (37) is fixedly mounted on the bottom wall of the mounting cover (8).

4. The refractometer calibration device according to claim 1, characterized in that: The top end of the liquid storage box (21) is provided with a plurality of liquid adding ports (2103), the plurality of liquid adding ports (2103) are respectively connected to the plurality of liquid storage chambers (2101), and a sealing cap (2104) is threadedly mounted on the top end of the liquid adding port (2103).

5. The refractometer calibration device according to claim 1, characterized in that: The driving mechanism comprises a first guide rail (2), the first guide rail (2) being fixedly mounted on the top of the base (1), a first slide seat (3) being slidably mounted inside the first guide rail (2), a first screw rod (4) being rotatably mounted inside the first guide rail (2), the first screw rod (4) passing through the first slide seat (3), and the first screw rod (4) being threadedly connected to the first slide seat (3), a second motor (5) being fixedly mounted on the top of the first guide rail (2), and an output end of the second motor (5) being fixedly connected to the top of the first screw rod (4).

6. A refractometer calibration device according to claim 1, characterized in that: A limit plate (20) is fixedly mounted on one side of the mounting cover (8), a plurality of through holes are formed on the limit plate (20), the third infusion tube (19) passes through the through holes, a support plate (18) is fixedly connected to the bottom wall of the limit plate (20), one end of the second infusion tube (17) passes through the support plate (18), and the second infusion tube (17) is fixedly connected to the support plate (18).

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