Magnetic rod, electromagnetic proportional valve and sphygmomanometer

Abstract

The utility model relates to a magnetic rod, an electromagnetic proportional valve and a sphygmomanometer, and relates to the technical field of fluid conveying. The magnetic rod comprises an inner core and a sealing piece, the inner core is provided with a working end, the working end is provided with a mounting hole, the sealing piece is located in the mounting hole, at least two stabilizing bosses with different extension lengths and / or different extension shapes are arranged on the face, facing the outside of the mounting hole, of the sealing piece, and an exhaust cavity is formed between the ends of every two adjacent stabilizing bosses. The arrangement of the stabilizing boss can increase the friction force after the sealing piece is in contact with the opening end face of the air passing cavity, and the stabilizing deformation displacement caused by the pressure applied to the stabilizing boss by the air pressure is reduced. According to the electromagnetic proportional valve, the position of the stabilizing boss is stable, so that the deformation proportion of the exhaust cavity is more stable, the exhaust rate of the electromagnetic proportional valve can be better changed proportionally, and the precision of the electromagnetic proportional valve is better improved.

Description

Technical Field

[0001] The present application relates to the technical field of fluid transportation, and in particular to a magnetic rod, an electromagnetic proportional valve and a sphygmomanometer. Background Art

[0002] Solenoid valve is an industrial device controlled by electromagnetics. It is a basic component for controlling fluid automation. It is an actuator and is not limited to hydraulic or pneumatic. Solenoid valves are often used in conjunction with air storage parts that need to maintain pressure, such as blood pressure monitor air bags, to achieve precise control of fluid flow, pressure and other parameters.

[0003] The solenoid valve can change the displacement of the magnetic rod by changing the coil current, thereby changing the opening of the valve port and controlling the outlet flow. For example, the invention patent with publication number CN113339512A discloses a solenoid valve, which can achieve closed gas path by driving the sealing member to close the gas passage cavity of the gas passage member through the inner core.

[0004] With respect to the above-mentioned related technologies, when the seal opens the air cavity, the reverse force of the air pressure in the air cavity on the seal is unstable, which makes the opening of the seal through the air cavity unstable, resulting in unstable proportional performance of the solenoid valve, affecting the accuracy of the solenoid valve's control over fluid flow, pressure and other parameters. Utility Model Content

[0005] In order to improve the accuracy, the purpose of this application is to provide a magnetic rod, an electromagnetic proportional valve and a sphygmomanometer.

[0006] In the first aspect, the present application provides a magnetic rod adopting the following technical solution:

[0007] A magnetic rod comprises an inner core and a sealing member, wherein the inner core has a working end, the working end is provided with a mounting hole, the sealing member is located in the mounting hole, the side of the sealing member facing the outside of the mounting hole is a working surface, at least two stabilizing bosses with different extension lengths and / or different extension shapes are provided on the working surface, and an exhaust cavity is formed between the ends of two adjacent stabilizing bosses.

[0008] By adopting the above technical solution, the setting of the stabilizing boss can increase the friction between the seal and the open end face of the gas cavity, and reduce the stabilizing deformation displacement caused by the pressure exerted by the air pressure on the stabilizing boss. The stable position of the stabilizing boss can make the deformation ratio of the exhaust cavity more stable, so that the exhaust rate of the electromagnetic proportional valve can be better proportionally changed, thereby improving the accuracy of the electromagnetic proportional valve.

[0009] Optionally, the number of the stabilizing bosses is at least three, and the sizes of all the exhaust cavities are the same, not completely the same, or completely different.

[0010] By adopting the above technical solution, after the opening of the air cavity is opened, the gas is discharged through the exhaust cavity, thereby reducing the pressure exerted by the air pressure on the stabilizing boss, thereby reducing the deformation instability of the stabilizing boss caused by the air flow pressure. The size of the exhaust cavity is set in conjunction with the size of the stabilizing boss to further improve the stability of the exhaust rate when the seal opens the air cavity opening.

[0011] Optionally, all the stabilizing bosses enclose a gas passage zone, and the cross section of the gas passage zone is quasi-circular, quasi-elliptical or irregularly shaped.

[0012] By adopting the above technical solution, the airflow in the air cavity completely enters the air passage zone and is then discharged from the exhaust cavity, thereby reducing the unstable deformation of the stabilizing boss caused by the direct impact of the airflow on the stabilizing boss. The cross-sectional settings of different shapes can assist in guiding the airflow direction, thereby further improving the stability of the exhaust rate when the seal opens the air cavity opening.

[0013] Optionally, the mounting hole includes a sealing section, a connecting section and a mounting section which are arranged in sequence along the radial direction of the inner core, the connecting section connects the mounting section and the sealing section, the sealing member includes a sealing portion, an anti-detachment portion for limiting the sealing portion from being separated from the inner core, and a connecting portion for connecting the sealing portion and the anti-detachment portion, the sealing portion is located in the sealing section and seals the opening of the connecting section, the connecting portion is located in the connecting section, and the anti-detachment portion is installed on one side of the mounting section close to the connecting section.

[0014] By adopting the above technical solution, the sealing part is installed in the sealing section, so that the sealing part of the inner core abuts against the open end face of the sealing section close to the air passing piece, and at this time the opening of the connecting section is sealed by the sealing part; the anti-slip part is located in the mounting section and abuts against the open end face of the mounting section close to the air passing piece; the connecting part connects the anti-slip part with the sealing part, so that the inner core can be clamped in the mounting hole without the need to use glue for fixing.

[0015] Optionally, the inner core further comprises a separation portion which can be broken under tension and separated from the anti-detachment portion, and when the sealing member is installed on the inner core, the separation portion is separated from the anti-detachment portion.

[0016] By adopting the above technical solution, the maximum diameter of the separation part is smaller than the diameter of the connecting section, so that the separation part can pass through the connecting section. By pulling the separation part toward the side away from the air passing part, the elastic anti-slip part can be elastically deformed during the pulling process of the separation part, so that the maximum diameter of the anti-slip part becomes smaller so that the anti-slip part can smoothly pass through the connecting section and enter the installation section. After the anti-slip part enters the installation section, the separation part is continued to be pulled so that the separation part and the anti-slip part are broken and separated, and the anti-slip part returns to the maximum diameter of the natural state. At this time, the maximum diameter is larger than the diameter of the connecting section so that the anti-slip part will not pass through the connecting section, thereby enabling the sealing part to be stably installed in the sealing section to improve the stability of the magnetic rod structure.

[0017] Optionally, a breakable groove is provided at the connection between the anti-slip portion and the separation portion.

[0018] By adopting the above technical solution, after the anti-slip part enters the installation section, the separation part continues to be pulled to break the easy-to-break groove, thereby realizing a more convenient separation of the anti-slip part and the separation part.

[0019] Optionally, the mounting hole includes a countersunk section and an anti-slip section, the countersunk section is located in the opening area of ​​the mounting hole, and the outer peripheral surface of the seal is provided with an anti-slip platform that is blocked by the countersunk section to limit detachment from the anti-slip section, and the anti-slip platform is located in the anti-slip section.

[0020] By adopting the above technical solution, when the seal is installed in the mounting hole, the anti-slip platform is blocked by the countersunk section and cannot be separated from the anti-slip section, so that the seal can be stably installed in the mounting hole, thereby improving the stability of the magnetic rod structure.

[0021] In the second aspect, the electromagnetic proportional valve provided in the present application adopts the following technical solution:

[0022] An electromagnetic proportional valve comprises any one of the magnetic rods mentioned above.

[0023] By adopting the above technical solution, the accuracy of the magnetic rod will have a great impact on the accuracy of the electromagnetic proportional valve. The electromagnetic proportional valve of the present application improves the accuracy of the sphygmomanometer test by improving the accuracy of the magnetic rod.

[0024] Optionally, the electromagnetic proportional valve also includes a shell, a frame arranged in the shell and a coil for generating electromagnetic force to drive the magnetic rod to move, the coil is arranged on the frame, an air passing part is installed on the shell, an air passing part is provided with an air passing cavity whose opening and closing is controlled by the sealing part, the frame has an inner hole connected to the air passing cavity, a reset elastic part for driving the magnetic rod to reset is installed in the inner hole, and the opening of the air passing cavity toward the side of the sealing part is arranged corresponding to the air passing area of ​​the sealing part.

[0025] By adopting the above technical solution, the coil pushes the magnetic rod to move toward the direction close to the gas passage part through electromagnetic force so that the seal on the magnetic rod closes the opening of the gas passage cavity, thereby restricting the flow of gas. Then the coil is powered off, and the magnetic rod moves toward the direction away from the gas passage part under the action of the reset elastic part to open the opening of the gas passage part. At this time, the stabilizing boss of the magnetic rod can increase the friction force after the seal contacts the end face of the gas passage cavity opening. By controlling the different lengths of the stabilizing boss, the deformation of the contact between the seal and the end face of the gas passage cavity opening can be effectively controlled. The small deformation is easy to recover, thereby improving the stability of the seal when opening the gas passage cavity opening, so as to improve the accuracy of the electromagnetic proportional valve.

[0026] In a third aspect, the present application provides a sphygmomanometer that adopts the following technical solution:

[0027] A sphygmomanometer comprises the electromagnetic proportional valve mentioned above.

[0028] By adopting the above technical solution, the accuracy of the electromagnetic proportional valve will have a great impact on the accuracy of the sphygmomanometer test. The sphygmomanometer of the present application improves the accuracy of the sphygmomanometer test by improving the accuracy of the electromagnetic proportional valve.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] 1. The setting of the stabilizing boss can increase the friction force after the seal contacts the end face of the air cavity opening. By controlling the different lengths of the stabilizing boss, the deformation at the contact point between the seal and the end face of the air cavity opening can be effectively controlled. The smaller the deformation, the easier it is to recover. Thus, the magnetic rod can control the position where the stabilizing boss is first restored according to the requirements of the design, thereby improving the stability of the seal when opening the air cavity opening, so as to improve the accuracy of the electromagnetic proportional valve;

[0031] 2. Install the sealing part in the sealing section so that the sealing part of the inner core abuts against the opening end face of the sealing section close to the air passing piece, and the opening of the connecting section is sealed by the sealing part; the anti-slip part is located in the mounting section and abuts against the opening end face of the mounting section close to the air passing piece; the connecting part connects the anti-slip part with the sealing part, so that the inner core can be clamped in the mounting hole without the need to use glue for fixing;

[0032] 3. When the seal is installed in the mounting hole, the anti-dropout platform is blocked by the countersunk hole and cannot be separated from the anti-dropout section, so that the seal can be stably installed in the mounting hole, thereby improving the stability of the magnetic rod structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the explosion structure of Example 1 of the present application;

[0034] Figure 2 is a schematic cross-sectional structural diagram of Embodiment 1 of the present application;

[0035] Figure 3 is a schematic diagram of the sealing structure of the first embodiment of the present application;

[0036] Figure 4 is a schematic diagram of the magnetic rod structure of the second embodiment of the present application;

[0037] Figure 5 It is a schematic diagram of the magnetic rod structure of Example 3 of the present application.

[0038] In the figure, 1, outer shell; 11, main shell; 12, cover plate; 2, skeleton; 21, inner hole; 3, coil; 4, air passing part; 41, air passing cavity; 5, reset elastic part; 6, inner core; 61, working end; 62, mounting hole; 621, countersunk section; 622, anti-slip section; 623, sealing section; 624, connecting section; 625, mounting section; 7, sealing part; 71, stabilizing boss; 72, air passing area; 73, exhaust cavity; 74, anti-slip platform; 75, sealing part; 76, connecting part; 77, anti-slip part; 78, separation part;. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-5 , further details of this application are given.

[0040] The embodiment of the present application discloses an electromagnetic proportional valve, which mainly improves the accuracy of electromagnetic proportional valve parameter control through the structural design of the magnetic rod. The design core of the present application lies in the magnetic rod, which can be replaced in various types of electromagnetic valves, including but not limited to normally open electromagnetic valves, normally closed electromagnetic valves, self-deflating electromagnetic valves, etc. For the convenience of description, the normally open electromagnetic valve used in this embodiment is used as an example.

[0041] Embodiment 1:

[0042] Reference Figure 1 and Figure 2 An electromagnetic proportional valve comprises a housing 1, a frame 2, a coil 3, an air passing member 4, a magnetic rod, and a reset elastic member 5. The magnetic rod comprises an inner core 6 and a sealing member 7. The coil 3 can generate electromagnetic force when energized.

[0043] The outer shell 1 is composed of a main shell 11 of a U-shaped structure and a cover plate 12 fixedly connected. The skeleton 2 is arranged in the outer shell 1, and the radial cross-section of the skeleton 2 is arranged in an "I" shape, and the coil 3 is wound and arranged on the outer peripheral surface of the skeleton 2. The skeleton 2 has an inner hole 21 in the radial direction, and the inner hole 21 is used to install the magnetic rod so that the magnetic rod can move along the radial direction of the skeleton 2. The air passing piece 4 is installed on the outer shell 1, and the air passing piece 4 is located at one end of the skeleton 2 in the radial direction. The end of the inner core 6 close to the air passing piece 4 is the working end 61, that is, the air passing piece 4 is located on the side where the working end 61 of the inner core 6 is located. One end of the reset elastic member 5 is arranged on the inner core 6 of the magnetic rod and the other end is arranged on the air passing piece 4. The air passing piece 4 is provided with an air passing cavity 41 for communicating with the inner hole 21, and the opening of the air passing cavity 41 is controlled by the sealing member 7 to open and close.

[0044] Specifically, when the electromagnetic proportional valve is energized, the electromagnetic force generated by the coil 3 is greater than the elastic force of the reset elastic member 5, and the electromagnetic force generated by the coil 3 pushes the magnetic rod to move toward the direction close to the gas passing member 4, so that the seal 7 on the magnetic rod closes the opening of the gas cavity 41, thereby limiting the flow of gas; when the voltage of the electromagnetic proportional valve is reduced or the power is cut off, the electromagnetic force generated by the coil 3 is reduced or even disappears, and the electromagnetic force generated by the coil 3 is less than the elastic force of the reset elastic member 5, and the elastic force of the reset elastic member 5 pushes the magnetic rod to move away from the gas passing member 4, so that the opening of the gas cavity 41 is opened and the gas can flow. The positional relationship and connection relationship between the housing 1, the frame 2, the coil 3, the gas passing member 4, the magnetic rod and the reset elastic member 5 are common knowledge well known to those skilled in the art, and will not be repeated here.

[0045] Reference Figure 2 and Figure 3 The working end 61 of the inner core 6 is provided with a mounting hole 62, which is arranged in a circular hole shape, and the axis of the mounting hole 62, the axis of the inner core 6 and the axis of the air passage 41 coincide with each other. The sealing member 7 is arranged in a cylindrical shape, and the sealing member 7 is located in the mounting hole 62. In the first embodiment, the mounting hole 62 of the inner core 6 and the sealing member 7 can be connected with each other by gluing to increase the connection strength.

[0046] The side of the seal 7 facing the outside of the mounting hole 62 is a working surface, and at least two stabilizing bosses 71 with different extension lengths and / or different extension shapes are provided on the working surface, and the heights of all stabilizing bosses 71 are as identical as possible. All stabilizing bosses 71 enclose a gas passage area 72, and the cross-section of the gas passage area 72 is circular, elliptical or irregularly shaped. The irregular shape includes but is not limited to a quadrilateral, a teardrop shape or a flower shape. The opening range of the gas passage cavity 41 is completely covered by the gas passage area 72, that is, when the seal 7 closes the opening of the gas passage cavity 41, the contact position between the stabilizing boss 71 and the opening end face of the gas passage cavity 41 is located outside the opening of the gas passage cavity 41.

[0047] An exhaust cavity 73 is formed between the ends of two adjacent stabilizing bosses 71. When the number of the stabilizing bosses 71 is at least three, the sizes of all the exhaust cavities 73 can be the same, not completely the same, or completely different according to design requirements. In the first embodiment, the number of the stabilizing bosses 71 is three, and the three stabilizing bosses 71 are three arc-shaped bosses with different extension lengths, and the radius of all the stabilizing bosses 71 is the same and the center of the circle coincides.

[0048] The implementation principle of the first embodiment of the present application is:

[0049] ① When restricting gas flow: the electromagnetic proportional valve is energized, the electromagnetic force generated by the coil 3 is greater than the elastic force of the reset elastic member 5, and the electromagnetic force generated by the coil 3 pushes the magnetic rod to move toward the direction close to the gas passing member 4, and the stabilizing boss 71 first contacts the open end surface of the gas passing cavity 41 and deforms and compresses until the working surface of the sealing member 7 completely covers the opening of the closed gas passing section, and the exhaust cavity 73 disappears due to deformation, and the gas in the gas passing cavity 41 cannot flow at this time;

[0050] ② When gas is allowed to flow: when the voltage of the electromagnetic proportional valve gradually decreases or the power is cut off, the electromagnetic force generated by the coil 3 decreases until it disappears. The electromagnetic force generated by the coil 3 is smaller than the elastic force of the reset elastic member 5. The elastic force of the reset elastic member 5 pushes the magnetic rod to gradually move away from the gas passing member 4. The exhaust chamber 73 recovers its deformation to gradually increase the deformation chamber. The rate at which the gas passes through the exhaust chamber 73 changes steadily, so that the flow rate of the electromagnetic proportional valve is more stable.

[0051] Embodiment 2:

[0052] Reference Figure 4 The difference between the second embodiment and the first embodiment lies in the structure of the magnetic rod. The main differences include the structure of the sealing member 7, the structure of the inner core 6, and the connection method between the sealing member 7 and the inner core 6.

[0053] The mounting hole 62 includes a countersunk section 621 and an anti-slip section 622 sequentially arranged in a direction away from the air passing member 4 . The countersunk section 621 is located in the opening area of ​​the mounting hole 62 . The aperture of the countersunk section 621 is slightly smaller than that of the anti-slip section 622 .

[0054] The outer circumferential surface of the seal 7 is provided with an anti-slip platform 74, which can be an annular boss whose axis coincides with the axis of the seal 7, or a plurality of bosses arranged at intervals in the circumferential direction with the axis of the seal 7 as the axis. The outer side surface of the anti-slip platform 74 is inclined toward the axis of the seal 7 in a direction away from the stabilizing boss 71, so as to facilitate the installation of the seal 7 into the installation hole 62.

[0055] When the seal 7 is installed in the mounting hole 62, the anti-slip platform 74 is located in the anti-slip section 622. At this time, the side of the anti-slip platform 74 facing the air passing part 4 is blocked by the countersunk section 621, thereby limiting the seal 7 from escaping from the anti-slip section 622, thereby allowing the seal 7 to be stably installed on the inner core 6 without gluing.

[0056] The implementation principle of the second embodiment is the same as that of the first embodiment.

[0057] Embodiment three:

[0058] Reference Figure 5The difference between the third embodiment and the first embodiment is the structure of the magnetic rod. The main differences include the structure of the sealing member 7, the structure of the inner core 6, and the connection method between the sealing member 7 and the inner core 6.

[0059] The mounting hole 62 includes a sealing section 623, a connecting section 624 and a mounting section 625 which are sequentially arranged in a direction away from the air passing member 4. The connecting section 624 connects the mounting section 625 and the sealing section 623. The axis of the sealing section 623, the axis of the connecting section 624, the axis of the mounting section 625, the axis of the inner core 6 and the axis of the air passing cavity 41 coincide. The aperture of the mounting section 625 is larger than the aperture of the sealing section 623, and the aperture of the sealing section 623 is larger than the aperture of the connecting section 624. The end of the mounting section 625 away from the sealing section 623 has an opening, and the opening is located on the end surface of the inner core 6 away from the air passing member 4.

[0060] The sealing member 7 includes a sealing portion 75 , a connecting portion 76 , an anti-detachment portion 77 and a separating portion 78 which are sequentially arranged in a direction away from the gas passing member 4 .

[0061] The sealing portion 75 is used to close the opening of the air cavity 41. The sealing portion 75 is cylindrical. The diameter of the sealing portion 75 is much larger than the aperture of the connecting section 624. The sealing portion 75 is installed in the sealing section 623. The end face of the sealing portion 75 facing the connecting portion 76 seals the opening of the connecting section 624.

[0062] The connecting portion 76 is used to connect the sealing portion 75 and the anti-detachment portion 77. The axial length of the connecting portion 76 is slightly smaller than the axial length of the connecting section 624, so that the inner core 6 can be clamped in the mounting hole 62 without the need for glue to fix it.

[0063] The anti-slip portion 77 is used to limit the sealing portion 75 from being separated from the sealing section 623 of the inner core 6, and the maximum cross section of the anti-slip portion 77 is slightly larger than the cross section of the connecting section 624. When the anti-slip portion 77 is subjected to tensile deformation, the maximum cross section of the anti-slip portion 77 will be elastically deformed and reduced so that the anti-slip portion 77 can pass through the connecting section 76 and enter the mounting section 625. After the anti-slip portion 77 enters the mounting section 625, the tension applied to the anti-slip portion 77 is stopped, and the anti-slip portion 77 returns to the maximum cross section of the natural state. At this time, the maximum cross section of the anti-slip portion 77 is larger than the cross section of the connecting section 624 so that the anti-slip portion 77 will not re-enter the connecting section 624.

[0064] The separation portion 78 is used to provide a pulling force to the anti-slip portion 77, and when the seal 7 is installed on the inner core 6, the separation portion 78 is separated from the anti-slip portion 77. When the separation portion 78 is not separated from the anti-slip portion 77, the lengths of the connecting portion 76, the anti-slip portion 77 and the separation portion 78 in the axial direction are greater than the length of the valve core in the axial direction. The diameter of the separation portion 78 is smaller than the aperture of the connecting portion 76, and an easy-to-break groove is provided at the connection between the anti-slip portion 77 and the separation portion 78, so as to facilitate the separation of the anti-slip portion 77 and the separation portion 78 after the anti-slip portion 77 enters the installation section 625.

[0065] The implementation principle of the third embodiment is the same as that of the first embodiment.

[0066] The embodiment of the present application discloses a sphygmomanometer, which mainly includes any one of the above-mentioned electromagnetic proportional valves or a magnetic rod in the above-mentioned electromagnetic proportional valve. By optimizing the magnetic rod structure, the electromagnetic proportional valve can control the stability change of the deflation rate, so that the accuracy of the electromagnetic proportional valve is improved, thereby improving the accuracy of the sphygmomanometer measurement.

[0067] The embodiments of this specific implementation method are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, and the same parts are represented by the same figure marks. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively. Therefore: All equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A magnetic rod, characterized in that: It includes an inner core and a sealing member, wherein the inner core has a working end, the working end is provided with a mounting hole, the sealing member is located in the mounting hole, the side of the sealing member facing the outside of the mounting hole is a working surface, at least two stabilizing bosses with different extension lengths and / or different extension shapes are provided on the working surface, and an exhaust cavity is formed between the ends of two adjacent stabilizing bosses.

2. A magnetic rod according to claim 1, characterized in that: The number of the stabilizing bosses is at least three, and the sizes of all the exhaust cavities are the same, not completely the same, or completely different.

3. A magnetic rod according to claim 1, characterized in that: The mounting hole includes a sealing section, a connecting section and a mounting section which are arranged in sequence along the radial direction of the inner core, the connecting section connects the mounting section and the sealing section, the sealing component includes a sealing portion, an anti-detachment portion for limiting the sealing portion from being separated from the inner core, and a connecting portion for connecting the sealing portion and the anti-detachment portion, the sealing portion is located in the sealing section and seals the opening of the connecting section, the connecting portion is located in the connecting section, and the anti-detachment portion is installed on the side of the mounting section close to the connecting section.

4. A magnetic rod according to claim 3, characterized in that: The inner core further comprises a separation portion which can be broken under tension and separated from the anti-detachment portion. When the sealing member is installed on the inner core, the separation portion is separated from the anti-detachment portion.

5. A magnetic rod according to claim 4, characterized in that: A break-away groove is provided at the connection between the anti-slip portion and the separation portion.

6. A magnetic rod according to claim 1, characterized in that: The mounting hole comprises a countersunk section and an anti-slip section, the countersunk section is located in the opening area of ​​the mounting hole, the outer peripheral surface of the sealing component is provided with an anti-slip platform which is blocked by the countersunk section to limit detachment from the anti-slip section, and the anti-slip platform is located in the anti-slip section.

7. An electromagnetic proportional valve, characterized in that: Comprising the magnetic rod according to any one of claims 1 to 6.

8. The electromagnetic proportional valve according to claim 7, characterized in that: It also includes an outer shell, a frame arranged in the outer shell and a coil for generating electromagnetic force to push the magnetic rod to move, the coil is arranged on the frame, an air passing part is installed on the outer shell, an air passing cavity which is controlled to open and close by the sealing member is arranged on the air passing part, an inner hole connected to the air passing cavity is provided in the frame, a reset elastic part for driving the magnetic rod to reset is installed in the inner hole, and an opening of the air passing cavity toward one side of the sealing member is arranged corresponding to the air passing area of ​​the sealing member.

9. A sphygmomanometer, characterized in that: It comprises the electromagnetic proportional valve as claimed in claim 8.

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