An encapsulation mold for a seawater salinity sensor

Abstract

The present invention relates to the technical field of conductance cell packaging molds, and particularly to a packaging mold for a seawater salinity sensor, which includes a positioning post fixed support, positioning posts, a conductance cell tube, a lower mold, a conductance cell support plate, an upper mold, a mold side plate, a guide rail, a limit block, and a guide rail slider. The positioning post fixed support and the mold side plate are respectively fixed on the guide rail slider by bolts. After the positioning post fixed support and the mold side plate are installed, they are perpendicular to the plane of the guide rail. The positioning posts are columnar structures made of polytetrafluoroethylene. One end of the positioning post is a cylindrical surface and is horizontally fixedly connected to the positioning post fixed support. The two positioning posts are coaxial after installation. This mold is installed using a guide rail, and most components are installed on the guide rail slider and can only slide in one dimension along the guide rail. When installing, there is no need to consider the installation accuracy of the other two dimensions. At the same time, it can be upgraded and transformed, and cooperate with a motor to drive the guide rail slider to achieve unmanned and batch production of three-electrode conductance cell packaging.

Description

Technical Field

[0001] The present invention relates to the technical field of conductance cell packaging molds, and particularly to a packaging mold for a seawater salinity sensor for measurement. Background Art

[0002] Ocean surveys have found that seawater is a multi-component solution with complex components, in which dozens of substances are dissolved in addition to water. Among them, there are mainly chloride ions accounting for about 55% of the content, sulfate ions accounting for 7.7%, sodium ions accounting for 30.6%, magnesium accounting for 3.7%, potassium accounting for 1.1%, and other substances. Salinity is a measure of the concentration of dissolved substances in seawater and is used to represent the salt content of seawater. The salt content of seawater is a basic characteristic of seawater, and its distribution and changes affect many characteristics of the ocean and the distribution and changes of other ocean elements. Accurately measuring seawater salinity is of great importance for marine scientific research and national livelihood. Measuring salinity is not only of great significance in many applied sciences such as salt chemical industry, aquaculture, ecological network surveys, climate and meteorological detection, energy exploration and utilization, etc. In the development process of marine science, people have been constantly seeking new measurement standards and measurement technologies to redefine salinity and deepen the understanding of salinity. The methods for measuring salinity mainly include chemical methods and physical methods;

[0003] Among them, the more common ones are the chemical method and the conductivity method. The chemical method is also simply called the silver nitrate titration method. Its principle is to perform titration with a silver nitrate solution on the premise that the proportion of chloride ions is constant, find the chlorinity through the Mac-Garrett table, and then determine the salinity value of the water sample according to the linear relationship between chlorinity and salinity. The chemical method is more common in laboratory measurements, but it is more difficult to apply in actual industrial production and real-time ocean observations. The conductivity method determines seawater salinity by the fact that different salinities have different conductivity characteristics. The conductivity measurement technology has the advantages of simple structure, high sensitivity, wide measurable range, and convenience for continuous measurement, and is widely used in marine automatic / continuous monitoring. There are also other methods for detecting seawater salinity, such as the density method, Raman spectroscopy method, Brillouin scattering method, ultraviolet spectroscopy method, etc. The density method first obtains the density from the specific gravity, and then calculates the salinity based on the density and temperature. Its measurement principle and the production of the instrument are relatively simple. The Raman spectroscopy method utilizes the quantitative relationship between the change in the electrolyte concentration in the solution and the Raman spectral characteristics of the solution, and calculates the salinity through the Raman spectral partial slope. This method is fast and simple. The Brillouin scattering method measures the Brillouin frequency shift and other parameters, and then calculates the salinity according to the empirical formula. Since frequency modulation detection is adopted, it has good anti-interference performance and a relatively high signal-to-noise ratio. The ultraviolet spectroscopy method inversely calculates the salinity based on the relationship between the ultraviolet absorption spectrum of the solution and salinity, and between salinity and wavelength, and can achieve a relatively high measurement accuracy. However, most of the above methods are still in the theoretical and experimental research stage, and the technology is relatively immature;

[0004] The method of measuring the conductivity of seawater and then calculating the seawater salinity with the aid of the 1978 Practical Salinity Scale is called the conductivity method. Since the electrical conductivity of seawater is measured by an electrical method, the accuracy can be greatly improved, and at the same time, the difficulty of sensor design can be significantly reduced, and the volume of the sensor can be decreased, making the on-line observation of the instrument easier to achieve. The current common measurement of conductivity sensors is divided into two types: electrode type and inductive type. Among them, the inductive sensor has an excitation coil and an induction coil built-in. The excitation coil generates a periodic alternating current signal, which generates an alternating electromagnetic field in seawater, and then induces a current signal in the induction coil in reverse. The magnitude of this induced current signal can reflect the conductivity of seawater. However, the inductive conductivity is easily affected by surrounding objects and has low accuracy. The electrode type sensor is further divided into different forms such as two-electrode, three-electrode, four-electrode, and seven-electrode. Their basic principle is to directly apply electricity to seawater, directly measure the excitation voltage and the current passing through seawater, and then calculate the conductivity of seawater. These different numbers of electrodes and structural forms are for the purposes of reducing the polarization effect, improving the anti-pollution ability, reducing the external influence, and increasing the seawater exchange rate, etc. Among them, the three-electrode has a very high conductivity cell constant, is very sensitive to the change of seawater conductivity, and at the same time has a reliable and stable structure, and can obtain accurate measurement results, which is the best measurement method among various measuring instruments. The main content described in this invention is a packaging mold for a three-electrode conductivity sensor. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a packaging mold for a sensor for measuring seawater salinity.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A packaging mold for a sensor for measuring seawater salinity, including a positioning post fixed support, positioning posts, a conductivity cell tube, a lower mold, a conductivity cell support plate, an upper mold, mold side plates, guide rails, limit blocks, and guide rail sliders. The positioning post fixed support and the mold side plates are respectively fixed on the guide rail sliders by bolts. After the positioning post fixed support and the mold side plates are installed, they are perpendicular to the plane of the guide rail. The positioning posts are columnar structures made of polytetrafluoroethylene. One end of the positioning post is a cylindrical surface and is horizontally fixedly connected to the positioning post fixed support. The other end of the positioning post is a conical surface and is movably clamped to the mold side plate. After the two positioning posts are installed, they are coaxial.

[0007] As a preferred technical solution of the present invention, the lower mold is fixedly clamped on the left and right two mold side plates by bolts and positioning pins. The conductivity cell support plate is movably placed in the profiling groove of the lower mold and is positioned by positioning pins. The lower mold is provided with lower exhaust holes for preventing air bubbles at the positions corresponding to the openings of the conductivity cell support plate.

[0008] As a preferred technical solution of the present invention, the conductance cell tube and the conductance cell support plate are parallel to each other, and the tapered end of the positioning post is fixedly connected to the conductance cell tube.

[0009] As a preferred technical solution of the present invention, the upper mold is provided with a glue filling port and an exhaust hole for glue filling and exhaust, the upper mold has a draft angle in the demolding direction, and the upper mold is also provided with four setscrew holes for demolding.

[0010] As a preferred technical solution of the present invention, a connection groove is opened at the lower end of the guide rail slider, a pulley is rotatably connected to the groove wall of the connection groove, the upper end of the guide rail slider is fixedly connected to the limit block, and a circular groove and two slots are opened on the limit block.

[0011] As a preferred technical solution of the present invention, wheel grooves are opened on both side walls of the guide rail, a tooth groove is opened on the upper surface of the guide rail, and two friction strips are fixedly installed on the upper surface of the guide rail, and the tooth groove is located between the two friction strips.

[0012] As a preferred technical solution of the present invention, the pulley is movably clamped with the wheel groove, the connection groove is movably clamped with the guide rail, round rods are movably sleeved in both of the two slots, and a vertical rod is movably sleeved in the circular groove.

[0013] As a preferred technical solution of the present invention, a top plate is fixedly connected to the upper ends of the vertical rod and the two round rods, a pull ring is fixedly connected to the upper surface of the top plate, a baffle is fixedly connected to the lower ends of the vertical rod and the two round rods, and a triangular clamping block is fixedly connected to the bottom surface of the baffle.

[0014] As a preferred technical solution of the present invention, a spring is movably sleeved on the rod surface of the vertical rod, and both ends of the spring are fixedly connected to the limit block and the baffle respectively.

[0015] As a preferred technical solution of the present invention, the clamping block can be movably clamped with each groove of the tooth groove.

[0016] Compared with the prior art, the beneficial effects that the present invention can achieve are:

[0017] 1. This mold is installed by using a guide rail. Most components are installed on the guide rail slider and can only slide in one dimension along the guide rail. When installing, there is no need to consider the installation accuracy in the other two directions. At the same time, it can be upgraded and transformed, and cooperate with a motor to drive the guide rail slider to realize unmanned and batch production of three-electrode conductance cells.

[0018] 2. In terms of encapsulation of this mold, the protective effect of sealant on the conductance cell tube is fully considered, which effectively protects the whole conductance cell tube; the positions of the mold exhaust holes are reasonably arranged to ensure the sealing and pressure resistance performance of the conductance cell and avoid the influence of bubbles on the strength of the sensor.

[0019] 3. The internal structure of the encapsulated sensor has high consistency, greatly reducing the mating problems during subsequent use. The mold fully considers the demolding problem of the sensor, with a reasonable draft angle and parting surface design, reducing the impact on the appearance of the sensor.

[0020] 4. This mold has a wide application range and can encapsulate sensor conductance elements of various lengths, greatly improving the use efficiency of the mold. This mold is easy to use, has a high encapsulation efficiency, and requires less manual operation. At the same time, it considers the issue of machine replacement during subsequent mass production, and has a certain degree of originality.

[0021] 5. Pull the top plate with the pull ring, so that the vertical rod and the two round rods can slide up and down along the circular groove and the slot, thereby driving the block at the bottom of the baffle to be engaged with the tooth groove at the corresponding position, so as to achieve the effect of restricting the position of the guide rail slider. The block is not easily offset in the tooth groove, and the fixing effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the structure of the guide rail in the present invention.

[0024] Figure 3 It is a schematic diagram of the structure of the positioning post fixing support in the present invention.

[0025] Figure 4 It is a schematic diagram of the structure of the limit block in the present invention.

[0026] Figure 5 It is a schematic diagram of the structure of the guide rail in the present invention.

[0027] Figure 6 It is a schematic diagram of the structure of the guide rail slider in the present invention.

[0028] Figure 7 It is a schematic diagram of the structure of the baffle in the present invention.

[0029] Wherein: 1. Positioning post fixing support; 2. Positioning post; 3. Conductivity cell tube; 4. Lower mold; 5. Conductivity cell support plate; 6. Upper mold; 7. Mold side plate; 8. Guide rail; 9. Limit block; 10. Guide rail slider; 11. Friction strip; 12. Tooth groove; 13. Wheel groove; 14. Slot; 15. Circular groove; 16. Pulley; 17. Connecting groove; 18. Top plate; 19. Vertical rod; 20. Spring; 21. Block; 22. Baffle; 23. Round rod; 26. Glue filling port; 27. Exhaust hole; 24. Lower exhaust hole. DETAILED DESCRIPTION OF THE INVENTION

[0030] In order to make the technical means, creative features, achieved objectives and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without making creative efforts all fall within the protection scope of the present invention. The experimental methods in the following embodiments are all conventional methods unless otherwise specified, and the materials, reagents, etc. used in the following embodiments can all be obtained from commercial channels unless otherwise specified. Embodiment

[0031] Such as Figures 1 to 6As shown in the figure, a packaging mold for a seawater salinity sensor includes a positioning post fixing support 1, positioning posts 2, a conductivity cell tube 3, a lower mold 4, a conductivity cell support plate 5, an upper mold 6, a mold side plate 7, guide rails 8, a limit block 9, and guide rail sliders 10. The positioning post fixing support 1 and the mold side plate 7 are respectively fixed to the guide rail sliders 10 by bolts. After the positioning post fixing support 1 and the mold side plate 7 are installed, they are perpendicular to the plane of the guide rail 8. The positioning posts 2 are columnar structures made of polytetrafluoroethylene. One end of the positioning post 2 is a cylindrical surface and is horizontally fixedly connected to the positioning post fixing support 1. The other end of the positioning post 2 is a conical surface and is movably clamped to the mold side plate 7. The two positioning posts 2 are coaxial after installation. The lower mold 4 is fixedly clamped to the left and right mold side plates 7 by bolts and positioning pins. The conductivity cell support plate 5 is movably placed in the profiling groove of the lower mold 4 and is positioned by a positioning pin. At the position corresponding to the opening of the lower mold 4 and the conductivity cell support plate 5, a lower exhaust hole 24 for preventing bubbles from generating is provided. During packaging, the air in the mold can be fully discharged to prevent bubbles from generating. The conductivity cell tube 3 and the conductivity cell support plate 5 are parallel to each other. The conical surface end of the positioning post 2 is fixedly connected to the conductivity cell tube 3, which does not affect the sealing of both ends of the conductivity cell tube and can completely encapsulate the conductivity cell tube inside the vulcanized rubber, playing a comprehensive protective role for the conductivity cell tube. The upper mold 6 is provided with a glue filling port 26 and an exhaust hole 27 for glue filling and exhaust. The upper mold 6 has a draft angle in the demolding direction. Four setscrew holes are also provided on the upper mold 6 for demolding. The conductivity cell tube 3 and the conductivity cell support plate 5 are both structurally positioned and fixed with the guide rail 8 as the reference, having the advantages of high positioning accuracy, convenient and flexible installation. The guide rail sliders 10 are installed on the guide rails 8 and can slide on the guide rails 8. The movement position of the guide rail sliders 10 can be restricted by the limit block 9. After the internal conductivity cell support plate 5 and the conductivity cell tube 3 are installed, the upper mold 6 is covered. After the upper mold 6 is closed, firstly, it can cooperate with the positioning posts 2 to achieve the effect of sealing at both ends. Secondly, it can closely adhere to the conductivity cell support plate 5 and be locked with the lower mold 4 by bolts to ensure the sealing of the edge. The glue filling port 26 and the exhaust hole 27 left on the upper mold 6 are used for glue filling and exhaust. In order to facilitate demolding, the upper mold 6 is provided with a certain draft angle in the demolding direction. Since all parts are fixed to the guide rail sliders 10, the limit block 9 can restrict the movement of the guide rail sliders 10 on the guide rails 8. One side is used as the positioning reference, and the other side can be adjusted according to the dimensional errors of the conductivity cell support plate 5 and the conductivity cell tube 3 to ensure that the mold has a relatively wide applicability. When conducting conductivity cell packaging, first, the positioning post fixing support 1, the positioning posts 2, and the mold side plate 7 are installed on the guide rail sliders 10, and the guide rail sliders 10 are installed on the guide rails 8. A limit block 9 is provided on one side of the guide rail 8.As a reference, the lower mold 4 is connected to the mold side plates 7 on both sides through positioning pins and bolts. One end is locked, and there is a gap at the other end. Then, the signal wire of the conductivity cell tube 3 is passed through the small hole at one end of the conductivity cell support plate 5, and the conductivity cell support plate 5 is placed into the profiling groove of the lower mold 4. The mold side plate 7 on the side with the gap is locked. Then, the fixed support 1 of the positioning post on one side is moved, and the conical cylindrical head end of the positioning post 2 is inserted into the conductivity cell tube 3 to fix the conductivity cell tube 3. Finally, the upper mold 6 and the positioning post 2 are closed, and the lower mold 4 is closely attached. After locking with the lower mold 4, the mold installation is completed;

[0032] Seal the glue from the glue filling port 26. After solidifying for eight to twelve hours, remove the upper mold 6 of the mold. Move the fixed guide rail slider 10 of the positioning post 2 from one side, and loosen the mold side plate 7 on one side by turning the bolt. Then, the completed three-electrode conductivity cell can be taken out, and another conductivity cell tube 3 and conductivity cell support plate 5 with wires passed through can be put in. Repeating the above steps can perform the encapsulation of the next three-electrode conductivity cell, which is convenient and fast. A connecting groove 17 is opened at the lower end of the guide rail slider 10. A pulley 16 is rotatably connected to the groove wall of the connecting groove 17. The upper end of the guide rail slider 10 is fixedly connected to a limiting block 9. A circular groove 15 and two slot holes 14 are opened on the limiting block 9. Wheel grooves 13 are opened on both side walls of the guide rail 8. A tooth groove 12 is opened on the upper surface of the guide rail 8. Two friction strips 11 are also fixedly installed on the upper surface of the guide rail 8. The tooth groove 12 is located between the two friction strips 11. The pulley 16 is movably clamped with the wheel groove 13. The connecting groove 17 is movably clamped with the guide rail 8. Round rods 23 are movably sleeved in both of the two slot holes 14. A vertical rod 19 is movably sleeved in the circular groove 15. The upper ends of the vertical rod 19 and the two round rods 23 are fixedly connected to a top plate 18. A pull ring is fixedly connected to the upper surface of the top plate 18. The lower ends of the vertical rod 19 and the two round rods 23 are fixedly connected to a baffle 22. A triangular clamping block 21 is fixedly connected to the bottom surface of the baffle 22. A spring 20 is movably sleeved on the rod surface of the vertical rod 19. The two ends of the spring 20 are respectively fixedly connected to the limiting block 9 and the baffle 22. The clamping block 21 can be movably clamped with each slot of the tooth groove 12.

[0033] Working principle: During use, both the conductivity cell tube 3 and the conductivity cell support plate 5 are structurally positioned and fixed with the guide rail 8 as the reference. This has the advantages of high positioning accuracy and convenient and flexible installation. The guide rail slider 10 is installed on the guide rail 8 and can slide on the guide rail 8. The movement position of the guide rail slider 10 can be restricted by the limit block 9. After the internal conductivity cell support plate 5 and the conductivity cell tube 3 are installed, the upper mold 6 is covered. After the upper mold 6 is closed, firstly, it can cooperate with the positioning column 2 to achieve the effect of sealing at both ends. Secondly, it can closely adhere to the conductivity cell support plate 5 and be locked with the lower mold 4 through bolts to ensure the sealing of the edge. The glue filling port 26 and the exhaust hole 27 left on the upper mold 6 are used for glue filling and exhaust. In order to facilitate smooth demolding, the upper mold 6 is provided with a certain draft angle in the demolding direction. Since all parts are fixed on the guide rail slider 10, the limit block 9 can restrict the movement of the guide rail slider 10 on the guide rail 8. One side is used as the positioning reference, and the other side can be adjusted according to the dimensional errors of the conductivity cell support plate 5 and the conductivity cell tube 3, ensuring that the mold has a relatively wide applicability. When encapsulating the conductivity cell, first install the positioning column fixed support 1, the positioning column 2, and the mold side plate 7 onto the guide rail slider 10, and then install the guide rail slider 10 onto the guide rail 8. A limit block 9 is set on one side of the guide rail 8 as the reference. The lower mold 4 is connected to the two mold side plates 7 on both sides through positioning pins and bolts, locked at one end, and with a gap left at the other end. Then, pass the signal wire of the conductivity cell tube 3 through the small hole at one end of the conductivity cell support plate 5, place the conductivity cell support plate 5 into the profiling groove of the lower mold 4, lock the mold side plate 7 with the gap left. Then move the positioning column fixed support 1 on one side, insert the conical cylindrical head end of the positioning column 2 into the conductivity cell tube 3 to fix the conductivity cell tube 3. Finally, close the upper mold 6 and the positioning column 2, closely adhere to the lower mold 4, and after locking with the lower mold 4, the mold installation is completed. Seal the glue through the glue filling port 26. After it solidifies for eight to twelve hours, remove the upper mold 6 of the mold, move the positioning column 2 on one side to fix the guide rail slider 10, loosen the mold side plate 7 on one side by turning the bolt, and then the completed three-electrode conductivity cell can be taken out. Place another conductivity cell tube 3 and conductivity cell support plate 5 with the wire passed through, and repeat the above steps to encapsulate the next three-electrode conductivity cell, which is convenient and fast. Pull the top plate 18 with the pull ring, so that the vertical rod 19 and the two round rods 23 can slide up and down along the round groove 15 and the slot 14, thereby driving the block 21 on the bottom surface of the baffle 22 to be engaged with the tooth groove 12 at the corresponding position, thereby achieving the effect of restricting the position of the guide rail slider 10. The block 21 is not easily offset in the tooth groove 12, and the fixing effect is good.

[0034] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to this. Within the scope of knowledge possessed by those skilled in the art to which it pertains, various changes can be made without departing from the gist of the present invention.

Claims

1. An encapsulation mold for a seawater salinity sensor, comprising a positioning post fixing support (1), a positioning post (2), a conductivity cell tube (3), a lower mold (4), a conductivity cell support plate (5), an upper mold (6), a mold side plate (7), a guide rail (8), a limit block (9), and a guide rail slider (10), characterized in that, The positioning post fixing support (1) and the mold side plate (7) are respectively fixed on the guide rail slider (10) by bolts. After the positioning post fixing support (1) and the mold side plate (7) are installed, they are perpendicular to the plane of the guide rail (8). The positioning post (2) is a columnar structure made of polytetrafluoroethylene. One end of the positioning post (2) is a cylindrical surface and is horizontally fixedly connected to the positioning post fixing support (1). The other end of the positioning post (2) is a conical surface and is movably clamped with the mold side plate (7). The left and right mold side plates (7) are both connected with the positioning post (2), and the two positioning posts (2) are coaxial after installation. A connecting groove (17) is opened at the lower end of the guide rail slider (10). A pulley (16) is rotatably connected to the groove wall of the connecting groove (17). The upper end of the guide rail slider (10) is fixedly connected to a limit block (9). A circular groove (15) and two insertion slots (14) are opened on the limit block (9). Wheel grooves (13) are opened on both side walls of the guide rail (8). A tooth groove (12) is opened on the upper surface of the guide rail (8). Two friction strips (11) are also fixedly installed on the upper surface of the guide rail (8). The tooth groove (12) is located between the two friction strips (11). The pulley (16) is movably clamped with the wheel groove (13). The connecting groove (17) is movably clamped with the guide rail (8). Round rods (23) are movably sleeved in both of the two insertion slots (14). A vertical rod (19) is movably sleeved in the circular groove (15). The upper ends of the vertical rod (19) and the two round rods (23) are fixedly connected to a top plate (18). A pull ring is fixedly connected to the upper surface of the top plate (18). The lower ends of the vertical rod (19) and the two round rods (23) are fixedly connected to a baffle plate (22). A triangular clamping block (21) is fixedly connected to the bottom surface of the baffle plate (22). The clamping block (21) can be movably clamped with each groove of the tooth groove (12).

2. The encapsulation mold for a seawater salinity sensor according to claim 1, characterized in that, The lower mold (4) is fixedly clamped on the left and right mold side plates (7) by bolts and positioning pins. The conductance cell support plate (5) is movably placed in the profiling groove of the lower mold (4) and is positioned by a positioning pin. Lower exhaust holes (24) for preventing air bubbles from remaining are opened at positions corresponding to the openings of the lower mold (4) and the conductance cell support plate (5).

3. The encapsulation mold for a seawater salinity sensor according to claim 2, characterized in that, The conductance cell tube (3) is parallel to the position of the conductance cell support plate (5). One conical end of the positioning post (2) is fixedly connected to the conductance cell tube (3).

4. A packaging mold for a seawater salinity sensor according to claim 3, characterized in that, A glue filling port (26) and an exhaust hole (27) for glue filling and exhaust are opened on the upper mold (6). The upper mold (6) has a draft angle in the demolding direction. Four setscrew holes are also opened on the upper mold (6) for demolding.

5. The encapsulation mold for a seawater salinity sensor according to claim 4, characterized in that, A spring (20) is movably sleeved on the rod surface of the vertical rod (19). The two ends of the spring (20) are respectively fixedly connected to the limit block (9) and the baffle plate (22).

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