High-pressure two-position three-way pilot-operated type electromagnetic valve

Abstract

The invention discloses a high-pressure two-position three-way pilot-operated type electromagnetic valve, which relates to the field of electromagnetic valves and comprises a bushing and an electromagnetic valve body on the outer side of the bushing, a screw plug and an antifouling filter screen are arranged in the bushing, an adjusting gasket, a protection ring and a first O-shaped sealing ring are arranged on the outer side of the screw plug, a coil assembly is arranged between the bushing and the electromagnetic valve body, and a driving mechanism is arranged at the upper end of the electromagnetic valve body. According to the high-pressure two-position three-way pilot-operated type electromagnetic valve, on-off control and emptying of a high-pressure gas circuit can be achieved, the conical surface sealing structure design is adopted, the sealing specific pressure is increased, reliable sealing is achieved, the magnetic conductivity is good, the coercive force is low, sealing pairs are made of polyformaldehyde, nonmetal and metal are connected through elastic pins, the structure is reliable, and the service life is long. Reliable use under various media can be ensured, the interior of the cavity is clean by adopting the antifouling filter screen structural design, and reliable connection and sealing are realized by adopting the screw mounting structural design.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valves, in particular to a high-pressure, two-position, three-way pilot-operated solenoid valve. Background Art

[0002] A three-way solenoid valve is an actuator with three interfaces that controls the flow of fluid inside a pipeline. There are many types of solenoid valves, and different solenoid valves play a role in different positions of the control system. They are widely used in hydraulic, pneumatic, gas and other automatic control systems. However, the existing three-way solenoid valves still have certain usage defects during use. The existing solenoid valves can be used with different circuits to achieve the expected control, and the control accuracy and flexibility can be guaranteed, but the general solenoid valves are only suitable for low-pressure work;

[0003] Patent authorization announcement number CN205654943U discloses a two-position, three-way, high-pressure solenoid valve. By turning the electromagnet on and off, it opens and closes the pilot hole at the valve end, causing the valve core to reverse direction and achieving reversal of the controlled fluid medium. It is used for braking and air belt sealing in hydropower stations. It can also be used in thermal power, mechanical metallurgy, chemical industry and other departments. The working medium is hydraulic oil or compressed air pipelines, which can be used for remote control and prevent related damage within 4MPa, thereby providing automatic control and protection for the unit. In addition, all parts of this utility model are made of materials such as stainless steel and copper, which can operate in humid environments. It has high pressure resistance, with a maximum rated pressure of 4MPa, and the solenoid valve is sensitive and has a long service life.

[0004] Patent authorization announcement number CN108916419B discloses a multifunctional, two-position, three-way solenoid valve with a uniform cross-section design. The diameters D2 and D3 at the two valve ports of the solenoid valve are identical to the rod diameters D1 and D4 at the upper sealing position of port B and port C, ensuring that the four cross-sectional areas are identical. As a result, the solenoid valve is not affected by fluid pressure throughout its movement, but only by the electromagnetic force and the return spring force. This ensures that the solenoid valve can open and close normally under the action of the spring and electromagnetic forces, thereby ensuring that the two-position, three-way solenoid valve can achieve high or even ultra-high pressures within the limits of material strength. The valve stem is metal with machined upper and lower conical surfaces. A hard non-metallic gasket is installed between the upper and lower metal valve seats and the intermediate valve sleeve at the valve port. The upper and lower valve port seals are squeezed and sealed by the conical surface and the edge of the non-metallic gasket. The upper and lower valve port seals of the solenoid valve have the advantages of self-centering, high sealing pressure, long life, and wear resistance, thereby improving sealing reliability. Furthermore, the valve also provides error compensation for the two-position, three-way solenoid valve.

[0005] In the above-mentioned patent disclosure, the three-way solenoid valve in the patent solves the above-mentioned problems, but the three-way solenoid valve still has the following problems: during the operation of the solenoid valve, the interior of the three-way solenoid valve needs to be sealed by a sealing ring or a sealing gasket, and the opening of the three-way solenoid valve needs to be controlled by an opening structure. The internal opening or closing of the solenoid valve requires multiple control structures to transmit to each other, resulting in an overly complex internal structure of the three-way solenoid valve, and the valve is directly connected to the interior of the external pipeline, which easily leads to accidental contamination of the interior of the three-way solenoid valve, seriously affecting the convenience of use of the three-way solenoid valve;

[0006] In the above-mentioned public patent, the solenoid valve in the patent solves the above-mentioned problems, but the solenoid valve still has the following problems. During the use of the solenoid valve, the internal opening or closing of the three-way solenoid valve requires multiple control structures to transmit to each other to complete, resulting in the internal structure of the three-way solenoid valve being too complicated and directly connected to the inside of the external pipeline, which can easily lead to accidental contamination of the interior of the three-way solenoid valve, seriously affecting the sealing effect of the three-way solenoid valve.

[0007] In view of the above problems, it is urgent to carry out innovative design based on the original solenoid valve structure. Summary of the Invention

[0008] The purpose of the present invention is to provide a high-pressure, two-position, three-way pilot-operated solenoid valve to solve the problem proposed in the above-mentioned background technology that the internal opening or closing of the existing three-way solenoid valve requires multiple control structures to transmit to each other, resulting in the internal structure of the three-way solenoid valve being too complicated and directly connected to the interior of the external pipeline, which easily leads to accidental contamination of the interior of the three-way solenoid valve and seriously affects the sealing effect of the three-way solenoid valve.

[0009] To achieve the above object, the present invention provides the following technical solution: a high-pressure, two-position, three-way pilot-operated solenoid valve, comprising a bushing and a solenoid valve body outside the bushing;

[0010] A screw plug and an anti-fouling filter are provided inside the bushing, and an adjustment gasket, a protective ring and an O-ring are provided on the outside of the screw plug. A coil assembly is provided between the bushing and the solenoid valve body, and a driving mechanism is provided at the upper end of the solenoid valve body.

[0011] Preferably, the adjustment gasket is located at one end of the bushing away from the solenoid valve body, and the protective ring on the outside of the bushing is arranged corresponding to the O-ring, and a valve core assembly is arranged inside the bushing.

[0012] Preferably, an iron core spring and a second O-ring are provided on the outside of the valve core assembly, and the second O-ring is located in the middle of the outside of the valve core assembly, and the iron core spring is located at one end of the valve core assembly away from the bushing.

[0013] Preferably, the coil assembly is located outside the valve core assembly, and the valve core assembly is located between the bushing and the solenoid valve body, and the bushing is located at the pilot port position of the solenoid valve body, while the valve core assembly is located in the middle of the solenoid valve body.

[0014] Preferably, a mounting cylinder is sleeved on the outer side of one end of the solenoid valve body away from the bushing, and positioning holes are opened on the outer sides of the mounting cylinder and the solenoid valve body, and a moving mainboard is rotatably mounted inside the mounting cylinder.

[0015] Preferably, a motion groove is opened inside the motion main board, and a sliding block is slidably installed inside the motion groove, and a motion plate is fixedly installed on the side of the sliding block away from the solenoid valve body, and the motion groove and the motion main board are symmetrically arranged in two groups about the horizontal center axis of the valve core assembly.

[0016] Preferably, a limit block is fixedly installed on the side of the sliding block close to the solenoid valve body, and the limit block and the moving plate are respectively located at the upper and lower ends of the moving main board, and an arc-shaped clamping block is fixedly installed on the end of the moving main board away from the bushing. The arc-shaped clamping block is arranged in an arc-shaped structure on the side close to the solenoid valve body, and two groups of arc-shaped clamping blocks are arranged on the outside of the solenoid valve body.

[0017] Preferably, a rotating screw is installed inside the motion groove, and the rotating screw is threadedly connected to two groups of sliding blocks, and two groups of rotating screws and motion main boards are arranged on the outside of the mounting cylinder, and the two groups of sliding blocks are fixedly connected to the limit blocks and the motion plate respectively.

[0018] Preferably, a rotating shaft is fixedly installed at one end of the motion mainboard close to the solenoid valve body, and the rotating shaft is rotatably installed inside the mounting tube, and a torsion spring is sleeved on the outer side of the rotating shaft, and the rotating shaft forms an elastic structure with the mounting tube through the torsion spring.

[0019] Preferably, a threaded ring is threadedly mounted on the outer side of the mounting cylinder, and an extrusion ring is slidably mounted on the outer side of the mounting cylinder, and the extrusion ring is located between the threaded ring and the mounting cylinder;

[0020] A fixed block is fixedly installed on the outer side of the extrusion ring, and a mounting rod is fixedly installed on the end of the fixed block away from the extrusion ring, and a rotating rod is rotatably installed on the end of the mounting rod away from the fixed block, and at the same time, the end of the rotating rod away from the mounting rod is rotatably connected to the moving mainboard.

[0021] Compared with the prior art, the present invention has the following beneficial effects: a pilot structure design is adopted to realize on-off control and venting of the high-pressure gas circuit; a conical sealing structure design is adopted to increase the sealing pressure ratio and realize reliable sealing; the magnetic material adopted is Y0Cr17NiSV, which has good magnetic conductivity and low coercive force; the sealing auxiliary material is homopolymer; the non-metal and the metal are connected by elastic pins; the structure is reliable and can ensure reliable use under various media; the anti-fouling filter structure design is adopted to realize the cleanliness of the cavity interior; the screw installation structure design is adopted to realize reliable connection and sealing.

[0022] 1. The functional characteristics of this high-pressure, two-position, three-way pilot-operated solenoid valve are mainly used in aircraft emergency power plant systems. By controlling the on / off and venting of the high-pressure gas circuit, it ensures the closing, sealing, and opening of the main valve. By controlling the pilot structure, it realizes the on / off control of the high-pressure gas circuit. The anti-fouling filter can ensure the cleanliness of the cavity. It has the advantages of high working pressure, light weight, good sealing, and compact structure.

[0023] 2. The structural features of this high-pressure, two-position, three-way pilot-operated solenoid valve have been tested and have stable performance and reliable technology. Its design concept has broad development space and market in the specialized industry;

[0024] 3. The main technologies of this high-pressure two-position three-way pilot solenoid valve, the pilot valve core assembly and the coil assembly have good promotion and application prospects. Its compact design and sealing form have good promotion scenarios;

[0025] 4. Economic analysis of the high-pressure two-position three-way pilot-operated solenoid valve. Most of the parts are made of stainless steel. The material supply is sufficient, the price is cheap, the cost is low, and it has strong economic value and market competitiveness.

[0026] 5. The practicality analysis of the high-pressure two-position three-way pilot-operated solenoid valve is that two sets of arc-shaped clamps are arranged on the outside of the solenoid valve body. The arc-shaped clamps can be used to limit and clamp the pipes connected to the outside of the solenoid valve body, and by rotating the screw, the solenoid valve body can be adapted to different styles of pipe limits, which effectively improves the safety and convenience of using the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the front cross-sectional structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the front view structure of the present invention;

[0029] Figure 3 It is a right side structural schematic diagram of the present invention;

[0030] Figure 4 This is a schematic diagram of the front view of the motion mainboard of the present invention;

[0031] Figure 5 This is a schematic diagram of the front view of the rotating screw structure of the present invention;

[0032] Figure 6 This is a schematic diagram of the right side structure of the arc-shaped clamping block of the present invention;

[0033] Figure 7 This is a front view structural diagram of the fixing block of the present invention;

[0034] Figure 8 This is a schematic diagram of the top view of the motion mainboard of the present invention.

[0035] In the figure: 1. Bushing; 2. Plug; 3. Anti-fouling filter; 4. Adjusting gasket; 5. Protective ring; 6. O-ring 1; 7. Coil assembly; 8. Valve core assembly; 9. Iron core spring; 10. O-ring 2; 11. Solenoid valve body; 12. Mounting cylinder; 13. Positioning hole; 14. Moving groove; 15. Sliding block; 16. Moving plate; 17. Limit block; 18. Arc clamping block; 19. Rotating screw; 20. Threaded ring; 21. Extrusion ring; 22. Fixed block; 23. Mounting rod; 24. Rotating rod; 25. Rotating shaft; 26. Moving main board; 27. Torsion spring; 28. Driving mechanism. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] Example 1: This example Figure 1-Figure 4 As shown, in order to solve the problem of loose sealing inside the existing solenoid valve, the process of sealing inside the solenoid valve is disclosed, which achieves the effect of stable sealing of the solenoid valve. The specific contents are as follows:

[0038] The bushing 1 and the solenoid valve body 11 outside the bushing 1; the busy interior of the bushing 1 is provided with a screw plug 2 and an anti-fouling filter 3, and the outside of the screw plug 2 is provided with an adjusting gasket 4, a protective ring 5 and an O-ring 6, a coil assembly 7 is provided between the bushing 1 and the solenoid valve body 11, and the upper end of the solenoid valve body 11 is provided with a driving mechanism 28, the adjusting gasket 4 is located at the end of the bushing 1 away from the solenoid valve body 11, and the protective ring 5 on the outside of the bushing 1 is provided corresponding to the O-ring 6, and the inner A valve core assembly 8 is provided in the part, and an iron core spring 9 and an O-ring 10 are provided on the outside of the valve core assembly 8, and the O-ring 10 is located in the middle position of the outside of the valve core assembly 8, and the iron core spring 9 is located at the end of the valve core assembly 8 away from the bushing 1, the coil assembly 7 is located on the outside of the valve core assembly 8, and the valve core assembly 8 is located between the bushing 1 and the solenoid valve body 11, and the bushing 1 is located at the pilot port position of the solenoid valve body 11, and the valve core assembly 8 is located in the middle of the solenoid valve body 11.

[0039] When the product is not powered, the valve core assembly 8 is tightly sealed against the bushing 1 by the spring force of the core spring 9. High-pressure gas is input from the inlet and acts on the main valve surface through the outlet, closing and sealing the main valve. When the product is powered, the coil assembly 7 generates electromagnetic attraction, causing the valve core assembly 8 to move left and separate from the bushing 1, tightly fitting and sealing against the coil assembly 7. The pilot hole on the bushing 1 opens, and the high-pressure gas in the cavity is discharged through the pilot hole. The main valve opens rapidly under the pressure differential. An anti-fouling filter 3 is provided at the outlet of the pilot hole of the bushing 1 to ensure the cleanliness of the cavity. The coil assembly 7 is provided with a mounting hole and connected to the valve seat by screws for easy installation and sealing.

[0040] Example 2: This example Figures 1-8 As shown, in order to solve the problem of limited installation stability of existing solenoid valves, a process for stably installing and using the solenoid valve is disclosed, which achieves the effect of ensuring stable installation between the solenoid valve and the pipeline. The specific contents are as follows:

[0041] A mounting cylinder 12 is sleeved on the outer side of the end of the solenoid valve body 11 away from the bushing 1, and a positioning hole 13 is provided on the outer side of the mounting cylinder 12 and the solenoid valve body 11, and a moving mainboard 26 is rotatably installed inside the mounting cylinder 12, a moving groove 14 is provided inside the moving mainboard 26, and a sliding block 15 is slidably installed inside the moving groove 14, and a moving plate 16 is fixedly installed on the side of the sliding block 15 away from the solenoid valve body 11, and the moving groove 14 and the moving mainboard 26 are symmetrically arranged in two groups about the transverse central axis of the valve core assembly 8, and a limit block 17 is fixedly installed on the side of the sliding block 15 close to the solenoid valve body 11. The limit block 17 and the moving plate 16 are respectively located at the upper and lower ends of the moving main board 26, and an arc-shaped clamping block 18 is fixedly installed on the end of the moving main board 26 away from the bushing 1. The arc-shaped clamping block 18 is arranged in an arc-shaped structure on the side close to the solenoid valve body 11, and two groups of arc-shaped clamping blocks 18 are arranged on the outside of the solenoid valve body 11. A rotating screw 19 is rotatably installed inside the moving groove 14, and the rotating screw 19 is threadedly connected to the two groups of sliding blocks 15, and two groups of rotating screws 19 and the moving main board 26 are arranged on the outside of the mounting cylinder 12, and the two groups of sliding blocks 15 are respectively fixedly connected to the limit block 17 and the moving plate 16.

[0042] When using the high-pressure, two-position, three-way pilot-operated solenoid valve, a group of mounting cylinders 12 and moving main boards 26 can be provided on the left and right sides of the valve body, respectively. The solenoid valve needs to be docked with an external pipeline. During the docking process, the external pipeline can be limited by the arc-shaped clamping block 18. In the process of docking the pipeline with the arc-shaped clamping block 18, the moving main board 26 will not contact the inlet pipeline at the upper end of the solenoid valve body 11. During the limiting process, the moving main board 26 is rotated from an inclined state to a horizontal state, and the torsion spring 27 is changed from an expanded state to a contracted state. State, and at this time, the extrusion ring 21 will be squeezed and limited by the threaded ring 20 and the mounting cylinder 12, and at the same time, the fixed block 22 and the mounting rod 23 outside the extrusion ring 21 will limit the rotating rod 24, so that the rotating rod 24 pushes the moving main board 26 to rotate from the inclined state to the horizontal state, and in the process of the rotation of the moving main board 26, the arc-shaped clamping block 18 will be mobilized to move and clamp the outside of the pipe joint, so that the three-way pilot solenoid valve remains stable when connected to the two sets of horizontally docked pipes, effectively improving the safety of the use of the three-way pilot solenoid valve.

[0043] Example 3: This example Figures 1-8 As shown, in order to solve the problem that the existing solenoid valve can only be connected to the pipe through threads, the process of the solenoid valve being able to limit and clamp the horizontally installed pipe under different conditions is disclosed, thereby achieving the effect that the solenoid valve can work stably. The specific content is as follows:

[0044] A rotating shaft 25 is fixedly installed on one end of the moving main board 26 close to the solenoid valve body 11, and the rotating shaft 25 is rotatably installed inside the mounting cylinder 12, and a torsion spring 27 is sleeved on the outer side of the rotating shaft 25. At the same time, the rotating shaft 25 and the mounting cylinder 12 form an elastic structure through the torsion spring 27. A threaded ring 20 is threadedly installed on the outer side of the mounting cylinder 12, and an extrusion ring 21 is slidably installed on the outer side of the mounting cylinder 12, and the extrusion ring 21 is located between the threaded ring 20 and the mounting cylinder 12. A fixed block 22 is fixedly installed on the outer side of the extrusion ring 21, and a mounting rod 23 is fixedly installed on the end of the fixed block 22 away from the extrusion ring 21, and a rotating rod 24 is rotatably installed on the end of the mounting rod 23 away from the fixed block 22, and at the same time, the end of the rotating rod 24 away from the mounting rod 23 is rotatably connected to the moving main board 26.

[0045] When using the high-pressure, two-position, three-way pilot-operated solenoid valve, the position of the arc-shaped clamping block 18 on the outside of the moving main board 26 can be adjusted to facilitate the use of the arc-shaped clamping block 18 in different situations. In the process of adjusting the position of the arc-shaped clamping block 18, it is necessary to rotate the screw 19 inside the moving groove 14. The rotation of the screw 19 will cause the sliding block 15 to slide inside the moving groove 14. At this time, the sliding block 15 can drive the moving plate 16 and the arc-shaped clamping block 18 to move, and the limit block 17 will move on the other side of the moving main board 26 and limit the sliding block 15, ensuring the stability of the movement of the sliding block 15, and at the same time ensuring the stability of the clamping of the arc-shaped clamping block 18, thereby increasing the overall practicality.

[0046] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-pressure, two-position, three-way pilot-operated solenoid valve, comprising a bushing (1) and a solenoid valve body (11) outside the bushing (1); Its characteristics are: A screw plug (2) and an anti-fouling filter (3) are provided inside the bushing (1), and an adjusting gasket (4), a protective ring (5) and an O-ring (6) are provided outside the screw plug (2). A coil assembly (7) is provided between the bushing (1) and the solenoid valve body (11), and a driving mechanism (28) is provided at the upper end of the solenoid valve body (11).

2. A high-pressure, two-position, three-way pilot-operated solenoid valve according to claim 1, characterized in that: The adjusting gasket (4) is located at one end of the bushing (1) away from the solenoid valve body (11), and the protective ring (5) on the outside of the bushing (1) is arranged corresponding to the O-ring (6), and a valve core assembly (8) is arranged inside the bushing (1).

3. A high-pressure, two-position, three-way pilot-operated solenoid valve according to claim 2, characterized in that: An iron core spring (9) and an O-ring (10) are arranged on the outside of the valve core assembly (8), and the O-ring (10) is located at the middle position of the outside of the valve core assembly (8), and the iron core spring (9) is located at one end of the valve core assembly (8) away from the bushing (1).

4. A high-pressure, two-position, three-way pilot-operated solenoid valve according to claim 3, characterized in that: The coil assembly (7) is located outside the valve core assembly (8), and the valve core assembly (8) is located between the bushing (1) and the solenoid valve body (11), and the bushing (1) is located at the pilot port position of the solenoid valve body (11), while the valve core assembly (8) is located in the middle of the solenoid valve body (11).

5. A high-pressure, two-position, three-way pilot-operated solenoid valve according to claim 4, characterized in that: A mounting cylinder (12) is sleeved on the outer side of one end of the solenoid valve body (11) away from the bushing (1), and positioning holes (13) are provided on the outer sides of the mounting cylinder (12) and the solenoid valve body (11), and a moving mainboard (26) is rotatably mounted inside the mounting cylinder (12).

6. A high-pressure, two-position, three-way pilot-operated solenoid valve according to claim 5, characterized in that: A motion groove (14) is provided inside the motion main board (26), and a sliding block (15) is slidably installed inside the motion groove (14), and a motion plate (16) is fixedly installed on the side of the sliding block (15) away from the solenoid valve body (11), and the motion groove (14) and the motion main board (26) are symmetrically arranged in two groups about the transverse center axis of the valve core assembly (8).

7. A high-pressure, two-position, three-way pilot-operated solenoid valve according to claim 6, characterized in that: A limit block (17) is fixedly installed on the side of the sliding block (15) close to the solenoid valve body (11), and the limit block (17) and the moving plate (16) are respectively located at the upper and lower ends of the moving main board (26), and an arc-shaped clamping block (18) is fixedly installed on the end of the moving main board (26) away from the bushing (1), and the arc-shaped clamping block (18) is arranged in an arc-shaped structure on the side close to the solenoid valve body (11), and two groups of arc-shaped clamping blocks (18) are arranged on the outer side of the solenoid valve body (11).

8. The high-pressure, two-position, three-way pilot-operated solenoid valve according to claim 7, characterized in that: A rotating screw (19) is rotatably installed inside the motion groove (14), and the rotating screw (19) is threadedly connected to two groups of sliding blocks (15). Two groups of rotating screws (19) and motion main boards (26) are provided on the outside of the mounting cylinder (12), and the two groups of sliding blocks (15) are fixedly connected to the limit blocks (17) and the motion plate (16) respectively.

9. The high-pressure, two-position, three-way, pilot-operated solenoid valve according to claim 8, characterized in that: A rotating shaft (25) is fixedly mounted on one end of the motion main board (26) close to the solenoid valve body (11), and the rotating shaft (25) is rotatably mounted inside the mounting cylinder (12), and a torsion spring (27) is sleeved on the outer side of the rotating shaft (25), and the rotating shaft (25) and the mounting cylinder (12) form an elastic structure through the torsion spring (27).

10. A high-pressure, two-position, three-way, pilot-operated solenoid valve according to claim 9, characterized in that: The outer side of the installation cylinder (12) is threadedly mounted with a threaded ring (20), and the outer side of the installation cylinder (12) is slidably mounted with an extrusion ring (21), and the extrusion ring (21) is located between the threaded ring (20) and the installation cylinder (12); A fixed block (22) is fixedly mounted on the outer side of the extrusion ring (21), and a mounting rod (23) is fixedly mounted on one end of the fixed block (22) away from the extrusion ring (21), and a rotating rod (24) is rotatably mounted on one end of the mounting rod (23) away from the fixed block (22), while the end of the rotating rod (24) away from the mounting rod (23) is rotatably connected to the moving main board (26).

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