A glassware calibration apparatus

Abstract

The utility model discloses a glass measuring vessel calibration device belongs to measurement technical field, glass measuring vessel calibration device includes base, is equipped with first support and second support on the base, wherein: first support is equipped with clamping subassembly and elevating adjustment subassembly, one side of first support and second support is equipped with water tank, and the upper end of second support is equipped with cantilever, and the tail end of cantilever is equipped with water injection subassembly, and is equipped with peristaltic pump on second support, and water tank is connected peristaltic pump and water injection subassembly in proper order through water pipe, water injection subassembly includes hollow pipe body, and the upper end of hollow pipe body is connected cantilever, and the lower end is equipped with water injection joint, and the water outlet below of water injection joint is equipped with the flow guide spare of inverted V shape, and the maximum outer diameter of flow guide spare is less than the inner diameter of the glass measuring vessel to be calibrated. The utility model discloses a glass measuring vessel calibration device can solve the problem that a large amount of splash is easy to produce in the calibration process, to further improve the accuracy of calibration.

Description

Technical Field

[0001] This utility model relates to the field of metrology technology, and in particular to a glass volumetric instrument calibration device. Background Technology

[0002] Glass measuring instruments are widely used in chemical analysis experiments in various fields as liquid analysis measuring instruments. The graduated cylinder is a commonly used glass measuring instrument. The cylindrical wall of the graduated cylinder is engraved with the volume range for users to read the volume. The maximum measuring volume ranges from a few milliliters to a few liters.

[0003] In chemical analysis and other experiments, glass volumetric instruments are calibrated to ensure data accuracy. During calibration, a water injection device is used to inject water into the glass volumetric instrument. However, existing water injection devices usually use a water pump to inject water into the glass volumetric instrument. On the one hand, the water pump uses the agitation and compression of the fan blades to transport water, resulting in a large number of air bubbles in the water. On the other hand, the large drop between the water outlet and the liquid surface and the excessive impact force of the water flow can easily generate a large amount of water splash. A large number of air bubbles and water splashes reduce the accuracy of calibration.

[0004] Utility model patent 202222856191.4 discloses a water injection device for calibrating a common glass volumetric instrument. Although the device can effectively avoid the phenomenon of generating a large number of air bubbles in the water during the calibration process, it fails to solve the problem of easily generating a large number of water splashes, resulting in the accuracy of calibration still needing to be improved. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a glass volumetric instrument calibration device to solve the problem of a large amount of water splashing during the calibration process, thereby further improving the accuracy of calibration.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A glass volumetric instrument calibration device includes a base, on which a first support and a second support are arranged side by side, wherein:

[0008] The first bracket is provided with a clamping assembly for holding the glass volumetric instrument to be calibrated and a lifting adjustment assembly that can drive the clamping assembly to move up and down;

[0009] The first and second supports are provided with water tanks on the side away from the clamping assembly. The upper end of the second support is provided with a cantilever above the first support. The end of the cantilever is provided with a water injection assembly that can be inserted into the glass volumetric instrument to be calibrated. The length of the water injection assembly is greater than or equal to the height of the glass volumetric instrument to be calibrated. The second support is provided with a peristaltic pump. The water tank is connected to the peristaltic pump and the water injection assembly in sequence through a water pipe.

[0010] The water injection assembly includes a vertically extending hollow tube. The upper end of the hollow tube is connected to the cantilever, and the lower end is provided with a water injection connector. Below the outlet of the water injection connector is an inverted V-shaped guide. The maximum outer diameter of the guide is smaller than the inner diameter of the glass volumetric instrument to be calibrated.

[0011] Furthermore, a connecting rod is fixedly provided in the middle of the upper surface of the guide member, and the upper end of the connecting rod is connected to the lower end face of the hollow tube body;

[0012] And / or, the upper surface of the flow guide is provided with a hydrophobic coating;

[0013] And / or, the angle between the upper surface of the guide and the horizontal plane is 30 degrees to 60 degrees;

[0014] And / or, the difference between the maximum outer diameter of the guide and the inner diameter of the glass volumetric instrument to be calibrated is 3mm-8mm.

[0015] Furthermore, the water pipe between the peristaltic pump and the water injection assembly extends through the hollow tube and connects to the inlet of the water injection connector.

[0016] Furthermore, the clamping assembly includes a support plate, on which are provided an upper clamping member for clamping the upper part of the glass volumetric instrument to be calibrated and a lower clamping member for clamping the lower part of the glass volumetric instrument to be calibrated. Both the upper clamping member and the lower clamping member include a fixed clamping block fixed on the support plate, a movable clamping block that can move relative to the fixed clamping block, and a locking structure for locking the relative position of the fixed clamping block and the movable clamping block.

[0017] Furthermore, a guide post is provided on the surface of the movable clamping block opposite to the fixed clamping block, and a guide hole is provided on the fixed clamping block to cooperate with the guide post. A spring is sleeved on the guide post between the movable clamping block and the fixed clamping block.

[0018] The locking structure includes a limit button, which is located at the guide hole of the fixed clamping block. The limit button has a through hole for the guide post to pass through, the inner diameter of the through hole is larger than the outer diameter of the guide post, the guide post has positioning teeth, the inner surface of the through hole near the end of the limit button has a positioning protrusion that can engage with the positioning teeth, and the end of the limit button has a spring.

[0019] Furthermore, the positioning protrusion is a right-angled triangle and the positioning tooth is an acute-angled triangle, so that when the moving clamping block is forced to move towards the fixed clamping block, the guide post can squeeze through the limit button, and when the spring force between the moving clamping block and the fixed clamping block exceeds the preset pressure, the guide post can automatically retract.

[0020] And / or, the limit button is provided with an elongated hole extending along its length, and the fixing block is provided with a pin hole at a position corresponding to the elongated hole, and a positioning pin passes through the pin hole and the elongated hole.

[0021] Furthermore, the fixed clamping block and the movable clamping block are respectively provided with a first receiving groove and a second receiving groove that cooperate with each other on their opposite surfaces, and each of the first receiving groove and the second receiving groove is provided with at least two buffer members.

[0022] Furthermore, the buffer includes a buffer pad and a connecting post located on the back of the buffer pad. A spring is sleeved on the connecting post between the buffer pad and the corresponding receiving groove. Both the first receiving groove and the second receiving groove are provided with insertion holes that cooperate with the connecting post.

[0023] Furthermore, the lifting adjustment assembly includes a lead screw located within the first bracket and a drive motor located on the first bracket to drive the lead screw. The lead screw is provided with a slider, which is fixedly connected to the support plate.

[0024] Furthermore, the base is provided with a slide rail, and the slide rail is provided with a scribing assembly that can move toward the first bracket.

[0025] This utility model has the following beneficial effects:

[0026] The glass volumetric instrument calibration device of this utility model includes a base, on which a first support and a second support are arranged side by side. The upper end of the second support is provided above the first support, and the end of the cantilever is provided with a water injection component that can be inserted into the glass volumetric instrument to be calibrated. The length of the water injection component is greater than or equal to the height of the glass volumetric instrument to be calibrated. The water injection component includes a vertically extending hollow tube, and the lower end of the hollow tube is provided with a water injection connector. Below the outlet of the water injection connector is an inverted V-shaped guide, that is, the water injection component can extend into the glass volumetric instrument to be calibrated, shortening the distance from the water injection connector to the liquid surface, which can avoid the generation of water splashes and air bubbles; and the inverted V-shaped guide can slow down the downward speed of the water flow and the flow rate of the water flow, thereby reducing the impact force of the water flow, further avoiding the generation of water splashes and air bubbles, and improving the calibration accuracy. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the glass volumetric calibration device of this utility model in its initial state, wherein (a) is a structural diagram in one direction and (b) is a structural diagram in another direction;

[0028] Figure 2 This is a schematic diagram of the overall structure of the glass volumetric calibration device of this utility model in use, wherein (a) is a structural diagram when no lines are engraved in one direction, and (b) is a structural diagram when lines are engraved in another direction;

[0029] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure at the central guide component;

[0030] Figure 4 for Figure 1 Top view of the upper / lower clamping components;

[0031] Figure 5 for Figure 4 A schematic diagram of the middle limit button;

[0032] Figure 6 for Figure 4 A cross-sectional view of the middle limit button, where (a) corresponds to the locked state and (b) corresponds to the unlocked state;

[0033] Figure 7 for Figure 6 A schematic diagram of the mating structure of the center positioning tooth and the positioning protrusion. Detailed Implementation

[0034] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0035] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0036] This utility model provides a glass volumetric instrument calibration device, such as... Figure 1-3 As shown, it includes a base 1, on which a first bracket 2 and a second bracket 3 are arranged side by side, wherein:

[0037] The first bracket 2 is provided with a clamping assembly 8 for clamping the glass volumetric instrument 4 to be calibrated and a lifting adjustment assembly that can drive the clamping assembly 8 to move up and down.

[0038] The first support 2 and the second support 3 are provided with a water tank 5 on the side away from the clamping component 8. The upper end of the second support 3 is provided with a cantilever 31 above the first support 2. The end of the cantilever 31 is provided with a water injection component 7 that can be inserted into the glass volumetric instrument 4 to be calibrated. The length of the water injection component 7 is greater than or equal to the height of the glass volumetric instrument 4 to be calibrated. The second support 3 is provided with a peristaltic pump 6. The water tank 5 is connected to the peristaltic pump 6 and the water injection component 7 in sequence through a water pipe 71.

[0039] Water injection assembly 7 includes a vertically extending hollow tube 72. The upper end of the hollow tube 72 is connected to a cantilever 31, and the lower end is provided with a water injection connector 73. Below the water outlet 731 of the water injection connector 73, there is an inverted V-shaped guide 74. The maximum outer diameter of the guide 74 is smaller than the inner diameter of the glass volumetric instrument 4 to be calibrated.

[0040] In use, firstly, the clamping assembly 8 clamps the glass volumetric vessel 4 to be calibrated. Then, the glass volumetric vessel calibration device is started. The clamping assembly 8 automatically rises under the drive of the lifting adjustment assembly until the guide 74 reaches the lower part of the glass volumetric vessel 4 to be calibrated. Then, the peristaltic pump 6 sends water from the water tank 5 through the water pipe to the hollow tube 72 of the water injection assembly 7. The lower end of the hollow tube 72 is provided with a water injection connector 73. Below the outlet 731 of the water injection connector 73, there is an inverted V-shaped guide 74. The water flows to the upper surface of the guide 74, where the upper surface of the guide 74 disperses and slows the water flow before it flows into the glass volumetric vessel 4 to be calibrated. As the water flow continues to be injected, the lifting adjustment assembly synchronously drives the clamping assembly 8 to lower the glass volumetric vessel 4 to be calibrated. Finally, after a certain amount of water has been injected, calibration can be performed according to conventional techniques.

[0041] This utility model discloses a glass volumetric instrument calibration device, comprising a base, on which a first support and a second support are arranged side by side. The upper end of the second support is provided above the first support, with a cantilever. The end of the cantilever is provided with a water injection component that can be inserted into the glass volumetric instrument to be calibrated. The length of the water injection component is greater than or equal to the height of the glass volumetric instrument to be calibrated. The water injection component includes a vertically extending hollow tube, with a water injection connector at the lower end of the hollow tube. Below the outlet of the water injection connector is an inverted V-shaped guide, which allows the water injection component to extend into the glass volumetric instrument to be calibrated, shortening the distance from the water injection connector to the liquid surface and preventing the generation of water splashes and air bubbles. Furthermore, the inverted V-shaped guide can slow down the descent speed and flow rate of the water, thereby reducing the impact force of the water flow, further preventing the generation of water splashes and air bubbles, and improving calibration accuracy.

[0042] like Figure 3 As shown, a connecting rod 741 can be fixedly mounted on the middle of the upper surface of the guide member 74. The upper end of the connecting rod 741 is connected to the lower end face of the hollow tube 72. This facilitates the fixing of the guide member 74. In specific implementation, the water injection connector 73 can be threaded to the hollow tube 72 first, then the connecting rod 741 can be connected to the guide member 74 to be used, and finally the upper end of the connecting rod 741 can be connected to the lower end face of the hollow tube 72. The connection between the connecting rod 741 and the hollow tube 72 is preferably a detachable connection (such as an elastic snap connection) so as to select a suitable guide member 74 according to the diameter of the glass volumetric instrument 4 to be calibrated.

[0043] The upper surface of the flow guide 74 can be coated with a hydrophobic coating, which facilitates the complete outflow of water without leaving any residue, thereby improving measurement accuracy. To ensure a smooth water flow, the angle θ between the upper surface of the flow guide 74 and the horizontal plane can be 30-60 degrees, such as 40, 45, or 50 degrees, and can be flexibly set according to requirements. The difference between the maximum outer diameter L of the flow guide 74 and the inner diameter of the glass volumetric instrument 4 to be calibrated can be 3-8 mm, such as 4 mm, 5 mm, or 6 mm, and can be flexibly set according to requirements.

[0044] The water pipe 71 between the peristaltic pump 6 and the water injection assembly 7 can extend through the hollow tube 72 and connect to the inlet 732 of the water injection connector 73. In this way, the water flow can be stably controlled and the measurement accuracy can be improved.

[0045] like Figure 1 and Figure 4 As shown, the clamping component 8 can take various forms readily conceived by those skilled in the art, but the following structural form is preferred in this invention:

[0046] The clamping assembly 8 includes a support plate 81. The support plate 81 is provided with an upper clamping member for clamping the upper part of the glass volumetric instrument 4 to be calibrated and a lower clamping member for clamping the lower part of the glass volumetric instrument 4 to be calibrated. Both the upper clamping member and the lower clamping member include a fixed clamping block 82 fixed on the support plate 81, a movable clamping block 83 that can move relative to the fixed clamping block 82, and a locking structure for locking the relative position of the fixed clamping block 82 and the movable clamping block 83.

[0047] The clamping component 8 with this structural form is easy to use and has low manufacturing cost.

[0048] like Figure 4-7 As shown, in order to facilitate locking the relative positions of the fixed clamping block 82 and the movable clamping block 83, a guide post 831 may be provided on the surface of the movable clamping block 83 opposite to the fixed clamping block 82, and a guide hole 821 that cooperates with the guide post 831 is provided on the fixed clamping block 82. A spring 832 is sleeved on the guide post 831 between the movable clamping block 83 and the fixed clamping block 82.

[0049] The locking structure may include a limit button 84, which is located at the guide hole 821 of the fixed clamping block 82. The limit button 84 has a through hole 841 for the guide post 831 to pass through. The inner diameter of the through hole 841 is larger than the outer diameter of the guide post 831. The guide post 831 has a positioning tooth 8311. The inner surface of the through hole 841 near the end of the limit button 84 has a positioning protrusion 8411 that can engage with the positioning tooth 8311. The end of the limit button 84 has a spring 842.

[0050] In use, press the limit button 84, and the spring 842 will be compressed, thus unlocking the guide hole 821. At this time, the guide post 831 can be smoothly inserted / removed (see reference). Figure 6 (b) At this time, it is in the unlocked state); release the limit button 84, and the limit button 84 rebounds under the action of the spring 842, so that the positioning protrusion 8411 extends into the positioning tooth 8311 to lock the position of the guide post 831 (refer to Figure 6 (a) is in a locked state, which allows for quick locking and unlocking, and the operation is simple and convenient.

[0051] Preferred, such as Figure 7 As shown, the positioning protrusion 8411 is a right-angled triangle, and the positioning tooth 8311 is an acute-angled triangle. This allows the guide post 831 to press through the limit button 84 when the moving clamp 83 is forced to move towards the fixed clamp 82. Furthermore, when the moving clamp 83 is released and the spring 832 between the moving clamp 83 and the fixed clamp 82 experiences a force exceeding a preset pressure, the guide post 831 automatically retracts. Thus, when the inward pressure applied by the moving clamp 83 exceeds the preset pressure, the limit button 84 automatically changes from the locked state to the unlocked state (i.e., the limit button 84 automatically rebounds), and the guide post 831 automatically retracts. Once the inward pressure applied by the guide post 831 does not exceed the preset pressure, the limit button 84 automatically changes from the unlocked state to the locked state, thus locking the position of the guide post 831. Existing locking structures often only lock in a fixed position. The locking structure in this invention automatically retracts and locks within a suitable pressure range when the pressure is too high. This ensures sufficient clamping force on the glass volumetric instrument 4 to be calibrated without damaging it due to excessive force. It is quick, convenient, and highly safe to use. The preset pressure can be flexibly set as needed, specifically by controlling the spring force of spring 832, the angle of the acute-angled triangle, etc., to adjust the preset pressure.

[0052] The limit button 84 may be provided with an elongated hole 843 extending along its length direction. The fixing block 82 is provided with a pin hole (not shown) at a position corresponding to the elongated hole 843. A positioning pin 844 passes through the pin hole (not shown) and the elongated hole 843 to limit the movement stroke of the limit button 84 and prevent the limit button 84 from falling off.

[0053] To facilitate the secure clamping of glass measuring instruments 4 of different sizes to be calibrated, the middle of the opposite surfaces of the fixed clamping block 82 and the movable clamping block 83 may be provided with a first receiving groove 823 and a second receiving groove 833 that cooperate with each other. At least two buffers are provided in both the first receiving groove 823 and the second receiving groove 833.

[0054] like Figure 4As shown, the buffer may include a buffer pad 85 and a connecting post 86 located on the back of the buffer pad 85. A spring 861 is sleeved on the connecting post 86 between the buffer pad 85 and the corresponding receiving groove. Both the first receiving groove 823 and the second receiving groove 833 are provided with insertion holes (not shown) that mate with the connecting post 86. Thus, the effect is good and the installation is convenient.

[0055] like Figure 1-2 As shown, the lifting adjustment assembly may include a lead screw 21 located within the first bracket 2 and a drive motor 22 located on the first bracket 2 to drive the lead screw 21. A slider (not shown, driven by the lead screw 2 to move up and down) is provided on the lead screw 2, and the slider is fixedly connected to the support plate 81. This lifting adjustment assembly is easy to use and has low manufacturing cost.

[0056] A slide rail 11 may be provided on the base 1, and a scribing assembly 12 that can move toward the first support 2 is provided on the slide rail 11. The scribing assembly 12 can mark the calibration results for easy subsequent use. In a specific implementation, the scribing assembly 12 may also include an infrared ray emitting device and a sensor to determine the water level height, thereby accurately scribing the lines.

[0057] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A glass volumetric instrument calibration device, characterized in that, Includes a base, on which a first bracket and a second bracket are arranged side by side, wherein: The first bracket is provided with a clamping assembly for holding the glass volumetric instrument to be calibrated and a lifting adjustment assembly that can drive the clamping assembly to move up and down; The first and second supports are provided with water tanks on the side away from the clamping assembly. The upper end of the second support is provided with a cantilever above the first support. The end of the cantilever is provided with a water injection assembly that can be inserted into the glass volumetric instrument to be calibrated. The length of the water injection assembly is greater than or equal to the height of the glass volumetric instrument to be calibrated. The second support is provided with a peristaltic pump. The water tank is connected to the peristaltic pump and the water injection assembly in sequence through a water pipe. The water injection assembly includes a vertically extending hollow tube. The upper end of the hollow tube is connected to the cantilever, and the lower end is provided with a water injection connector. Below the outlet of the water injection connector is an inverted V-shaped guide. The maximum outer diameter of the guide is smaller than the inner diameter of the glass volumetric instrument to be calibrated.

2. The glass volumetric instrument calibration device according to claim 1, characterized in that, A connecting rod is fixedly provided in the middle of the upper surface of the flow guide, and the upper end of the connecting rod is connected to the lower end face of the hollow tube. And / or, the upper surface of the flow guide is provided with a hydrophobic coating; And / or, the angle between the upper surface of the guide and the horizontal plane is 30 degrees to 60 degrees; And / or, the difference between the maximum outer diameter of the guide and the inner diameter of the glass volumetric instrument to be calibrated is 3mm-8mm.

3. The glass volumetric instrument calibration device according to claim 1, characterized in that, The water pipe between the peristaltic pump and the water injection assembly extends through the hollow tube and connects to the inlet of the water injection connector.

4. The glass volumetric calibration device according to any one of claims 1-3, characterized in that, The clamping assembly includes a support plate, on which are provided an upper clamping member for clamping the upper part of the glass volumetric instrument to be calibrated and a lower clamping member for clamping the lower part of the glass volumetric instrument to be calibrated. The upper clamping member and the lower clamping member each include a fixed clamping block fixed on the support plate, a movable clamping block that can move relative to the fixed clamping block, and a locking structure for locking the relative position of the fixed clamping block and the movable clamping block.

5. The glass volumetric calibrator device according to claim 4, characterized in that, The movable clamping block has a guide post on its surface opposite to the fixed clamping block, the fixed clamping block has a guide hole that mates with the guide post, and a spring is sleeved on the guide post between the movable clamping block and the fixed clamping block. The locking structure includes a limit button, which is located at the guide hole of the fixed clamping block. The limit button has a through hole for the guide post to pass through, the inner diameter of the through hole is larger than the outer diameter of the guide post, the guide post has positioning teeth, the inner surface of the through hole near the end of the limit button has a positioning protrusion that can engage with the positioning teeth, and the end of the limit button has a spring.

6. The glass volumetric instrument calibration device according to claim 5, characterized in that, The positioning protrusion is a right-angled triangle, and the positioning tooth is an acute-angled triangle, so that when the moving clamping block is subjected to force and moves toward the fixed clamping block, the guide post can squeeze through the limit button, and when the spring force between the moving clamping block and the fixed clamping block exceeds the preset pressure, the guide post can automatically retract. And / or, the limit button is provided with an elongated hole extending along its length, and the fixing block is provided with a pin hole at a position corresponding to the elongated hole, and a positioning pin passes through the pin hole and the elongated hole.

7. The glass volumetric calibrator device according to claim 4, characterized in that, The fixed clamping block and the movable clamping block are respectively provided with a first receiving groove and a second receiving groove that cooperate with each other on their opposite surfaces. Each of the first receiving groove and the second receiving groove is provided with at least two buffer members.

8. The glass volumetric calibration device according to claim 7, characterized in that, The buffer includes a buffer pad and a connecting post located on the back of the buffer pad. A spring is sleeved on the connecting post between the buffer pad and the corresponding receiving groove. Both the first receiving groove and the second receiving groove are provided with insertion holes that cooperate with the connecting post.

9. The glass volumetric calibrator device according to claim 4, characterized in that, The lifting and adjusting assembly includes a lead screw located inside the first bracket and a drive motor located on the first bracket to drive the lead screw. The lead screw is provided with a slider, and the slider is fixedly connected to the support plate.

10. The glass volumetric calibration device according to claim 4, characterized in that, The base is provided with a slide rail, and the slide rail is provided with a scribing assembly that can move toward the first bracket.

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