Automatic volume setting device for liquid level of glass container

Abstract

The utility model discloses a glass measuring vessel liquid level automatic constant volume device, including needle control module, clamping module, visual control module, pump liquid module, liquid storage tank and controller. Needle control module includes the thick needle and thin needle of switchable position, pump liquid module and liquid storage tank between the pipeline connection, needle control module and pump liquid module between the pipeline connection, and pump liquid module draws liquid from the liquid storage tank and injects into needle control module, needle control module, visual control module, pump liquid module are electrically connected with controller, and the needle of needle control module is lifted and switched through the controller control, and the pump liquid module is controlled to inject liquid to needle control module through the controller, and the visual control module is controlled to shoot liquid level and handle imaging through the controller. The device uses the double needle design of thick needle and thin needle, and the thick needle realizes rapid liquid injection, and the thin needle realizes accurate constant volume liquid surface, reaches the uniform speed microinjection under the liquid, real -time detection liquid level continuous change, realizes the capacity accurate constant volume.

Description

Technical Field

[0001] This utility model relates to the field of liquid level control technology, and in particular to an automatic liquid level control device for glass measuring instruments. Background Technology

[0002] A glass volumetric flask is a measuring instrument with markings indicating its capacity. The volume of the liquid is determined by the position of the liquid level on the markings. Due to surface tension and wetting of the liquid surface, the liquid level may appear concave. When reading the liquid level scale, the instrument should be viewed at eye level to accurately read the value of the marking at the concave point. Failure to operate correctly can easily introduce human error.

[0003] The use of machine vision inspection technology, which replaces the human eye with image recognition technology from a vision camera to determine liquid level, is increasingly attracting the attention of glass volumetric vessel users and developers. In existing publicly available technologies, a single filling tube is typically used to complete the liquid injection process, with the liquid initially added quickly, then slowly, and finally drop by drop, until the liquid level is brought to the designated mark.

[0004] However, the technology for automatically volumetrically adjusting glass volumetric instruments using the aforementioned disclosed technology still has the following drawbacks: the existing technology, which uses only one liquid filling tube, makes it difficult to balance the contradiction between liquid filling efficiency and liquid filling accuracy. If the tube diameter is too large, the precision of the dripping will be reduced; if the tube diameter is too small, the filling efficiency will be reduced. Especially for high-precision glass volumetric instruments, the dripping method will result in a large liquid level step, which will also increase the volumetric error. Utility Model Content

[0005] In view of the shortcomings of the prior art, this utility model provides an automatic liquid level control device for glass measuring instruments to overcome the deficiencies in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: An automatic volumetric level control device for glass volumetric instruments includes a needle control module, a clamping module, a vision control module, a pump module, a storage tank, and a controller, all housed inside a chassis. The pump module and the storage tank are connected by piping, as are the needle control module and the pump module. The pump module draws liquid from the storage tank and injects it into the needle control module. The clamping module is used to clamp the glass volumetric instrument. The needle control module, the vision control module, the pump module, and the controller are electrically connected.

[0007] The needle control module includes a first slide, a first slider, a first screw, a first coupling, a first motor, a servo motor, and a needle holder. The first slide is vertically fixed inside the housing, and a first slide rail is provided on the inner side of the first slide. The first screw is rotatably mounted on the first slide, and the first screw is rotatably connected to the output shaft of the first motor through the coupling, so that the first motor drives the first screw to rotate through the first coupling. The first slider is threaded onto the first screw, and the first slider slides in cooperation with the first slide rail, so that when the first motor drives the first screw to rotate, it also drives the first slider to slide and rise on the first slide rail. The servo motor is rotatably mounted on the first slider, and the needle holder is mounted on the output shaft of the servo motor. The needle holder is equipped with a coarse needle and a fine needle, which are connected to the pump module via flexible tubing. Under the rotation control of the servo motor, the initial positions of the fine needle and the coarse needle can be switched. The vision control module includes a vision camera; The liquid storage tank is used to store the filled liquid.

[0008] Furthermore, the clamping module includes a clamp frame, a Y-shaped clamping block, a clamping post, a guide post, an opening clamping lever, and a closing clamping spring; The fixture frame is fixedly installed inside the chassis, and a pair of guide grooves are symmetrically opened on the top plate of the fixture frame; The Y-shaped clamps are arranged in pairs on the top surface of the fixture frame and correspond to a pair of guide slots on the fixture frame. Each Y-shaped clamp has a pair of clamping posts vertically arranged on its top surface. A pair of Y-shaped clamps has a total of four clamping posts for clamping and positioning the glass measuring instrument. Each Y-shaped clamp has a guide post protruding from its bottom surface. The guide post passes downward through the guide slots on the fixture frame and extends to the bottom of the top plate of the fixture frame. The clamping lever is rotatably mounted on the lower surface of the top plate of the fixture frame via a rotating shaft. A pair of arc-shaped grooves are symmetrically opened on the clamping lever, spiraling outward from the center. The pair of arc-shaped grooves on the clamping lever correspond to a pair of guide straight grooves on the fixture frame. The guide post on the Y-shaped clamping block passes through the guide straight groove and the arc-shaped groove from top to bottom and slides and is engaged in the guide straight groove and the arc-shaped groove. The clamping spring is a ring spring, which is disposed on the lower surface of the opening lever and sleeved on the lower end of a pair of guide posts.

[0009] Furthermore, the pump module includes a pair of redundant parallel injection pumps. One end of the injection pump is connected to a four-way valve head, and the other end of the injection pump is connected to a push-pull module. The four-way valve head is connected in parallel with a three-way valve and a hose. The injection pump has an injection chamber. The four-way valve head has four valve ports, one of which is connected to the injection chamber of the injection pump, and the other three valve ports are respectively connected to the reservoir, the fine needle, and the coarse needle.

[0010] Furthermore, the vision control module also includes a horizontal adjustment component, a vertical lifting component, and a lighting component; The lateral adjustment assembly includes a manual slide, a manual screw, and a manual slider. The manual slide is horizontally fixed inside the housing, and a manual slide rail is provided on the inner side of the manual slide. The manual screw is rotatably mounted on the manual slide, and the manual slider is threaded onto the manual screw, with the manual slider slidingly engaged with the manual slide rail. This allows the manual screw to move horizontally on the manual slide when the handwheel at one end of the manual screw is manually turned.

[0011] Furthermore, the longitudinal lifting assembly includes a second carriage, a second slider, a second screw, a second coupling, and a second motor; the second carriage is vertically fixed on the manual slider and moves with it, and a second slide rail is provided on the inner side of the second carriage; the second screw is rotatably mounted on the second carriage, and the second screw is rotatably connected to the output shaft of the second motor through the coupling, so that the second motor drives the second screw to rotate through the second coupling; the second slider is threaded onto the second screw, and the second slider slides in cooperation with the second slide rail, so that when the second motor drives the second screw to rotate, it also drives the second slider to slide and rise on the second slide rail; the vision camera is mounted on the second slider and moves up and down with it.

[0012] Furthermore, the lighting assembly includes a first supplementary light and a second supplementary light arranged diagonally opposite each other at a high and low position, as well as a light-absorbing black curtain; the first supplementary light is positioned high on the top of the second carriage, the second supplementary light is positioned low on the fixture frame, and the light-absorbing black curtain is positioned inside the chassis and opposite the vision camera on both sides of the glass measuring instrument.

[0013] Preferably, the needle control module is located above the clamping module, the vision control module is located on one side of the clamping module, the pump module and the storage tank are arranged side by side in the bottom compartment of the chassis, and the controller is located above the vision control module and on one side of the needle control module.

[0014] Preferably, the coarse needle is initially positioned vertically and aligned with the glass volumetric container located directly below, so that it can be inserted into the glass volumetric container when it descends with the first slider; the fine needle is initially positioned at an angle.

[0015] Preferably, the controller is equipped with a display screen and a set of control buttons.

[0016] Preferably, a sample rack is provided on the top of the chassis.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: 1) The automatic liquid level control device for glass containers in this case uses a dual-needle design with a coarse needle and a fine needle. The coarse needle enables rapid liquid injection, while the fine needle enables precise liquid level control, replacing the existing drip-based liquid level control method. This achieves uniform micro-injection under liquid, real-time detection of continuous changes in liquid level, and precise volume control.

[0018] 2) The automatic liquid level control device for glass containers in this case is designed with an automatic centering clamping module to ensure the repeatability and centering accuracy of the glass volumetric instrument.

[0019] 3) The automatic liquid level control device for glass containers in this case adopts a multi-module integrated and ergonomic design, which improves the integration of the equipment, saves space, and enhances the stability and ease of operation of the equipment.

[0020] 4) In this case, the automatic liquid level control device for glass containers has the controller located in the upper right corner, which is convenient for visual observation and right-hand operation; the liquid storage tank and injection pump are located at the bottom of the machine, which is convenient for lowering the center of gravity and improving stability; the vision control module is located in the middle of the device and can be adjusted horizontally and raised and lowered, which is conducive to further ensuring the quality of imaging detection.

[0021] To provide a clearer understanding of this invention, the preferred embodiments of this invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the needle control module of this utility model; Figure 3 , Figure 4 This is a schematic diagram of the clamping module of this utility model; Figure 5 This is an exploded view of the clamping module of this utility model; Figure 6 This is a schematic diagram of the structure of the vision control module of this utility model; Figure 7 This is a schematic diagram of the pump module of this utility model.

[0023] Attached image labels: 1-Needle control module, 2-Clamping module, 3-Vision control module, 4-Pump module, 5-Reservoir, 6-Controller, 7-Sample rack; 11-First carriage, 12-First slider, 13-First screw, 14-First coupling, 15-First motor, 16-Servo motor, 17-Needle holder, 171-Coarse needle, 172-Fine needle; 21-Clamping frame, 22-Y-type clamping block, 23-Clamping post, 24-Guide post, 25-Clamping lever, 26-Clamping clamp Spring; 211-Guide straight groove; 251-Arc groove; 33-Vision camera; 311-Manual slide; 312-Manual screw; 313-Manual slider; 321-Second slide; 322-Second slider; 323-Second screw; 324-Second coupling; 325-Second motor; 341-First supplementary light; 342-Second supplementary light; 343-Light-absorbing black curtain; 41-Injection pump; 42-Four-way valve head; 43-Push-pull module; 44-Three-way valve. Detailed Implementation

[0024] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0025] Furthermore, if terms such as "first" or "second" are used for descriptive purposes only, they are mainly used to distinguish different devices, components or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, components or parts, and should not be construed as indicating or implying relative importance.

[0026] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0027] Please see Figure 1-7This utility model provides an automatic volume control device for glass volumetric instruments, comprising a needle control module (1), a clamping module (2), a vision control module (3), a pump module (4), a storage tank (5), and a controller (6) disposed inside a housing; the needle control module (1) is located above the clamping module (2), the vision control module (3) is disposed on one side of the clamping module (2), the pump module (4) and the storage tank (5) are disposed side by side in the bottom compartment of the housing, and the controller (6) is located above the vision control module (3) and on one side of the needle control module (1); a pipe is connected between the pump module (4) and the storage tank (5). The pipeline is connected between the needle control module (1) and the pump module (4). The pump module (4) draws liquid from the storage tank (5) and injects it into the needle control module (1). The clamping module (2) is used to clamp the glass volumetric instrument. The needle control module (1), the vision control module (3), the pump module (4) are electrically connected to the controller (6). The controller (6) controls the needle lifting and switching on the needle control module (1), controls the pump module (4) to inject liquid into the needle control module (1), and controls the vision control module (3) to capture the liquid level and process the image.

[0028] The needle control module (1) includes a first slide (11), a first slider (12), a first screw (13), a first coupling (14), a first motor (15), a servo motor (16), and a needle holder (17); the first slide (11) is vertically fixed inside the housing and a first slide rail is provided on the inner side of the first slide (11); the first screw (13) is rotatably mounted on the first slide (11), and the first screw (13) is rotatably connected to the output shaft of the first motor (15) through the coupling. The first motor (15) drives the first screw (13) to rotate through the first coupling (14); the first slider (12) is threaded onto the first screw (13), and the first slider (12) slides with the first slide rail, so that when the first motor (15) drives the first screw (13) to rotate, it also drives the first slider (12) to slide up and down on the first slide rail; the servo motor (16) is rotatably mounted on the first slider (12), and the pin seat (17) is mounted on the output shaft of the servo motor (16).

[0029] A coarse needle (171) and a fine needle (172) are installed on the needle holder (17). The coarse needle (171) and the fine needle (172) are connected to the pump module (4) through hoses respectively. The coarse needle (171) is initially set vertically and aligned with the glass volumetric container located directly below, so that the coarse needle (171) can be inserted into the glass volumetric container when it descends with the first slider (12). The fine needle (172) is initially set at an angle. Under the rotation control of the servo motor (16), the initial positions of the fine needle (172) and the coarse needle (171) can be switched, so that the fine needle (172) can also be aligned and inserted into the glass volumetric container as needed, so that the coarse needle (171) and the fine needle (172) can be switched as needed to inject liquid into the glass volumetric container.

[0030] The clamping module (2) includes a clamp frame (21), a Y-shaped clamping block (22), a clamping post (23), a guide post (24), an opening clamping lever (25), and a closing clamping spring (26). The fixture frame (21) is fixedly installed inside the chassis, and a pair of guide slots (211) are symmetrically opened on the top plate of the fixture frame (21).

[0031] Y-shaped clamps (22) are arranged in pairs on the top surface of the clamp frame (21) and correspond to a pair of guide grooves (211) on the clamp frame (21). A pair of clamping posts (23) are vertically arranged on the top surface of each Y-shaped clamp (22). A total of four clamping posts (23) on a pair of Y-shaped clamps (22) are used to clamp and position the glass measuring instrument. A guide post (24) is protruding from the bottom surface of each Y-shaped clamp (22). The guide post (24) passes downward through the guide grooves (211) on the clamp frame (21) and extends to the bottom of the top plate of the clamp frame (21).

[0032] The clamping lever (25) is rotatably mounted on the lower surface of the top plate of the clamping frame (21) via a rotating shaft. A pair of arc-shaped grooves (251) are symmetrically opened on the clamping lever, spiraling outward from the center. The pair of arc-shaped grooves (251) on the clamping lever (25) correspond to a pair of guide straight grooves (211) on the clamping frame (21). The guide post (24) on the Y-shaped clamping block (22) passes through the guide straight groove (211) and the arc-shaped groove (251) from top to bottom and slides and engages in the guide straight groove (211) and the arc-shaped groove (251).

[0033] The clamping spring (26) is a ring spring. The clamping spring (26) is set on the lower surface of the opening lever (25) and sleeved on the lower end of a pair of guide posts (24).

[0034] The working principle of the clamping module (2) is as follows: When the clamping lever (25) is turned, under the combined limiting and guiding action of the arc groove (251) and the guide straight groove (211), a pair of guide posts (24) with a pair of Y-shaped clamps (22) separate to both sides of the fixture frame (21), and the clamping spring (26) is stretched. At this time, the glass volume can be placed between the four clamping posts (23). When the clamping lever (25) is released, under the action of the clamping spring (26), the guide posts (24) drive the clamping lever (25) and the Y-shaped clamps (22) to move and reset in opposite directions. The glass volume is clamped and positioned in the middle of the four clamping posts (23), so that the glass volume is located in the center of the fixture frame (21), which makes it easier for the fixture frame (21) to position and align the needle above it.

[0035] The vision control module (3) includes a horizontal adjustment component, a vertical lifting component, a vision camera (33) and a lighting component; The lateral adjustment assembly includes a manual slide (311), a manual screw (312), and a manual slider (313). The manual slide (311) is horizontally fixed inside the housing, and a manual slide rail is provided on the inner side of the manual slide (311). The manual screw (312) is rotatably mounted on the manual slide (311), and the manual slider (313) is threaded onto the manual screw (312), and the manual slider (313) slides in cooperation with the manual slide rail. When the handwheel at one end of the manual screw (312) is manually turned, the manual screw (312) drives the manual slider (313) to move horizontally on the manual slide (311).

[0036] The longitudinal lifting assembly includes a second slide (321), a second slider (322), a second screw (323), a second coupling (324), and a second motor (325). The second slide (321) is vertically fixed on the manual slider (313) and moves with the manual slider (313). A second slide rail is provided on the inner side of the second slide (321). The second screw (323) is rotatably mounted on the second slide (321). The second screw (323) is rotatably connected to the output shaft of the second motor (325) through the coupling, so that the second motor (325) drives the second screw (323) to rotate through the second coupling (324). The second slider (322) is threaded onto the second screw (323). The second slider (322) slides with the second slide rail, so that when the second motor (325) drives the second screw (323) to rotate, it also drives the second slider (322) to slide and lift on the second slide rail.

[0037] A vision camera (33) is mounted on the second slider (322) and moves up and down with the second slider (322).

[0038] The lighting assembly includes a first fill light (341) and a second fill light (342) set diagonally opposite each other at a high and low position, and a light-absorbing black screen (343); the first fill light (341) is set at a high position on the top of the second carriage (321), the second fill light (342) is set at a low position on the fixture frame (21), and the light-absorbing black screen (343) is set inside the chassis and is located on both sides of the glass volumetric opposite to the vision camera (33).

[0039] The pump module (4) includes a pair of redundant parallel syringe pumps (41). One end of each syringe pump (41) is connected to a four-way valve head (42), and the other end is connected to a push-pull module (43). The four-way valve head (42) is connected in parallel to a hose via a three-way valve (44). Each syringe pump (41) has an injection chamber. The four-way valve head (42) has four ports, one of which communicates with the injection chamber of the syringe pump (41), and the other three ports are connected to the reservoir (5), the fine needle (172), and the coarse needle (171), respectively. During operation, only two of the four ports of the four-way valve head (42) (one inlet and one outlet) are open, and the other two ports are closed. The two syringe pumps (41) work alternately, using the three-way valve (44) to achieve two inlets and one outlet. When one of the injection pumps (41) finishes injecting the liquid in its chamber, the other injection pump (41) then injects the liquid, while the former continues to draw in liquid until the injection chamber of the injection pump (41) is full, waiting for the next injection command.

[0040] Storage tank (5), which is used to store filled liquid.

[0041] The controller (6) is equipped with a display screen and a set of control buttons. The controller (6) is electrically connected to the needle control module (1), the vision control module (3), and the pump module (4). The controller (6) controls the needle raising and lowering and needle switching on the needle control module (1), controls the pump module (4) to inject liquid into the needle control module (1), and controls the vision control module (3) to capture and process the liquid level image. As a preferred embodiment, a sample rack (7) is provided on the top of the chassis. The sample rack (7) is provided with an array of inclined supports to hang glass measuring instruments, which helps to ventilate the placement and drain the containers.

[0042] The working principle of this utility model is as follows: 1. Move the clamping lever (25) to one side, and a pair of Y-shaped clamps (22) will open to both sides along the arc groove (251). Place the glass volumetric glass in the middle of the clamping post (23) of the Y-shaped clamps (22). When the clamping lever (25) is released, the Y-shaped clamps (22) will push the glass volumetric glass to the center position and clamp it.

[0043] 2. Adjust the camera height until it reaches the level of the marking line. The vision camera (33) takes an image of the glass volume and identifies the marking line of the specified scale.

[0044] 3. The controller (6) controls the servo motor (16) to select the coarse needle to align with the glass volumetric container. The needle control module (1) drives the coarse needle to move downward until the needle is close to the bottom of the glass volumetric container.

[0045] 4. Start the syringe pump (41) to begin rapid liquid addition. The two syringe pumps (41) work alternately. When one syringe pump (41) finishes injecting the liquid in the cavity, the other syringe pump (41) will then inject the liquid. The former will continue to draw in liquid until the injection cavity is full, and wait for the next injection command.

[0046] 5. The injection speed can be adjusted in real time according to the injection volume of the syringe pump (41) or the liquid level observed by the vision camera (33). When the target scale is approached, the syringe pump (41) stops adding liquid.

[0047] 6. Restart the needle control module (1) to move the coarse needle upward away from the glass volumetric container. When it reaches the fixed position above the glass volumetric container, the controller (6) controls the rotation of the servo motor (16) and the fine needle (172) enters the working area. Then, the needle control module (1) starts to move downward to insert the fine needle (172) into the glass volumetric container.

[0048] 7. When the needle tip of the fine needle (172) is inserted to a small depth below the liquid surface, start the injection pump (41) again. At this time, the injection pump (41) adds liquid at a very small feed rate.

[0049] 8. The vision camera (33) acquires liquid surface images in real time, and the controller (6) identifies the liquid level in real time through image processing. Based on the relationship between the liquid level and the target scale line, it determines whether the volume adjustment is completed. During the process of the liquid level rising, the needle control module (1) rises synchronously and keeps the end of the fine needle (172) submerged below the liquid surface. When the controller (6) detects that the concave point of the liquid surface is tangent to the upper edge of the target scale line, it determines that the volume adjustment is completed.

[0050] 9. Finally, the needle control module (1) moves the fine needle (172) out of the glass volumetric container and stops running after reaching the fixed position above the glass volumetric container.

[0051] Compared to existing technologies, the automatic volumetric level control device for glass volumetric instruments in this case uses a dual-needle design with a coarse needle and a fine needle. The coarse needle enables rapid liquid injection, while the fine needle enables precise volume control, replacing the existing method of titration for volume control. This achieves uniform micro-injection under liquid, real-time detection of continuous changes in liquid level, and precise volume control.

[0052] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. An automatic volumetric level control device for a glass volumetric instrument, characterized in that: The device includes a needle control module (1), a clamping module (2), a vision control module (3), a pump module (4), a storage tank (5), and a controller (6) located inside the chassis. The pump module (4) and the storage tank (5) are connected by a pipeline, and the needle control module (1) and the pump module (4) are connected by a pipeline. The pump module (4) draws liquid from the storage tank (5) and injects it into the needle control module (1). The clamping module (2) is used to clamp glass volumetric instruments. The needle control module (1), the vision control module (3), the pump module (4), and the controller (6) are electrically connected. The needle control module (1) includes a first slide (11), a first slider (12), a first screw (13), a first coupling (14), a first motor (15), a servo motor (16), and a needle holder (17); the first slide (11) is vertically fixed inside the housing and a first slide rail is provided on the inner side of the first slide (11); the first screw (13) is rotatably mounted on the first slide (11), and the first screw (13) is rotatably connected to the output shaft of the first motor (15) through the coupling. This causes the first motor (15) to drive the first screw (13) to rotate through the first coupling (14); the first slider (12) is threaded onto the first screw (13), and the first slider (12) slides with the first slide rail, so that when the first motor (15) drives the first screw (13) to rotate, it also drives the first slider (12) to slide and rise on the first slide rail; the servo motor (16) is rotatably mounted on the first slider (12), and the pin seat (17) is mounted on the output shaft of the servo motor (16); A coarse needle (171) and a fine needle (172) are mounted on the needle holder (17). The coarse needle (171) and the fine needle (172) are respectively connected to the pump module (4) through a hose. Under the rotation control of the servo motor (16), the initial positions of the fine needle (172) and the coarse needle (171) can be switched. The vision control module (3) includes a vision camera (33). The liquid storage tank (5) is used to store the filled liquid.

2. The automatic volumetric level control device for a glass volumetric instrument according to claim 1, characterized in that: The clamping module (2) includes a clamp frame (21), a Y-shaped clamping block (22), a clamping post (23), a guide post (24), an opening clamping lever (25), and a closing clamping spring (26). The fixture frame (21) is fixedly installed inside the chassis, and a pair of guide slots (211) are symmetrically opened on the top plate of the fixture frame (21). The Y-shaped clamps (22) are arranged in pairs on the top surface of the clamp frame (21) and correspond to a pair of guide grooves (211) on the clamp frame (21). Each Y-shaped clamp (22) has a pair of clamping posts (23) vertically arranged on its top surface. A total of four clamping posts (23) on a pair of Y-shaped clamps (22) are used to clamp and position the glass measuring instrument. Each Y-shaped clamp (22) has a guide post (24) protruding from its bottom surface. The guide post (24) passes downward through the guide grooves (211) on the clamp frame (21) and extends to the bottom of the top plate of the clamp frame (21). The clamping lever (25) is rotatably mounted on the lower surface of the top plate of the clamp frame (21) via a rotating shaft. A pair of arc-shaped grooves (251) are symmetrically opened on the clamping lever, spiraling outward from the center. The pair of arc-shaped grooves (251) on the clamping lever (25) correspond to a pair of guide straight grooves (211) on the clamp frame (21). The guide post (24) on the Y-shaped clamping block (22) passes through the guide straight groove (211) and the arc-shaped groove (251) from top to bottom and slides and is engaged in the guide straight groove (211) and the arc-shaped groove (251). The clamping spring (26) is a ring spring. The clamping spring (26) is located on the lower surface of the opening lever (25) and is sleeved on the lower end of a pair of guide posts (24).

3. The automatic volumetric level control device for a glass volumetric instrument according to claim 2, characterized in that: The pump module (4) includes a pair of redundant parallel injection pumps (41). One end of the injection pump (41) is connected to a four-way valve head (42), and the other end of the injection pump (41) is connected to a push-pull module (43). The four-way valve head (42) is connected in parallel with a three-way valve (44) and a hose. The injection pump (41) has an injection chamber. The four-way valve head (42) has four valve ports, one of which is connected to the injection chamber of the injection pump (41), and the other three valve ports are connected to the reservoir (5), the fine needle (172), and the coarse needle (171), respectively.

4. The automatic volumetric level control device for a glass volumetric instrument according to claim 3, characterized in that: The vision control module (3) also includes a horizontal adjustment component, a vertical lifting component, and a lighting component; The lateral adjustment assembly includes a manual slide (311), a manual screw (312), and a manual slider (313); the manual slide (311) is horizontally fixed inside the housing, and a manual slide rail is provided on the inner side of the manual slide (311); the manual screw (312) is rotatably mounted on the manual slide (311), and the manual slider (313) is threaded onto the manual screw (312), and the manual slider (313) slides with the manual slide rail; so that when the handwheel at one end of the manual screw (312) is manually turned, the manual screw (312) drives the manual slider (313) to move horizontally on the manual slide (311).

5. The automatic volumetric level control device for a glass volumetric instrument according to claim 4, characterized in that: The longitudinal lifting assembly includes a second slide (321), a second slider (322), a second screw (323), a second coupling (324), and a second motor (325); the second slide (321) is vertically fixed on the manual slider (313) and moves with the manual slider (313), and a second slide rail is provided on the inner side of the second slide (321); the second screw (323) is rotatably mounted on the second slide (321), and the second screw (323) is rotatably connected to the second motor (325) through the coupling. The output shaft enables the second motor (325) to drive the second screw (323) to rotate via the second coupling (324); the second slider (322) is threaded onto the second screw (323), and the second slider (322) slides with the second slide rail, so that when the second motor (325) drives the second screw (323) to rotate, it also drives the second slider (322) to slide and rise on the second slide rail; the vision camera (33) is mounted on the second slider (322) and follows the second slider (322) to rise and fall.

6. The automatic volumetric level control device for a glass volumetric instrument according to claim 5, characterized in that: The lighting assembly includes a first fill light (341) and a second fill light (342) set diagonally opposite each other at a high and low position, and a light-absorbing black screen (343); the first fill light (341) is set at a high position on the top of the second carriage (321), the second fill light (342) is set at a low position on the fixture frame (21), and the light-absorbing black screen (343) is set inside the chassis and is located on both sides of the glass volumetric opposite to the vision camera (33).

7. The automatic volumetric level control device for a glass volumetric instrument according to claim 6, characterized in that: The needle control module (1) is located above the clamping module (2), the vision control module (3) is located on one side of the clamping module (2), the pump module (4) and the storage tank (5) are arranged side by side in the bottom compartment of the chassis, and the controller (6) is located above the vision control module (3) and on one side of the needle control module (1).

8. The automatic volumetric level control device for a glass volumetric instrument according to claim 6, characterized in that: The coarse needle (171) is initially positioned vertically and aligned with the glass volumetric container located directly below, so that the coarse needle (171) can be inserted into the glass volumetric container when it descends with the first slider (12); the fine needle (172) is initially positioned at an angle.

9. The automatic volumetric level control device for a glass volumetric instrument according to claim 6, characterized in that: The controller (6) is equipped with a display screen and a set of control buttons.

10. The automatic volumetric level control device for a glass volumetric instrument according to claim 3, characterized in that: A sample rack (7) is provided on the top of the chassis.

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