An anti-caking dome valve

Abstract

This application belongs to the field of dome valve technology and discloses an anti-caking dome valve, including a dome valve body. A circular through-hole is provided through the top of the dome valve body. A connecting column is rotatably connected within the circular through-hole. A valve core, fixed to the connecting column, is rotatably installed within the circular through-hole. A material conveying through-hole is provided through the top of the valve core. An inflatable sealing gasket is fixed to the side wall of the circular through-hole near its top. A sealing cylinder is fixed to the dome valve body. An air supply pipe is provided through and fixed to the side wall of the sealing cylinder near its top. The end of the air supply pipe away from the sealing cylinder is fixed and connected to the side wall of the inflatable sealing gasket. A sealing piston is slidably connected within the air supply pipe. A driving mechanism is provided on the dome valve body. This application, by providing a driving mechanism, ensures that the sealing piston remains in a self-locking state after rising, thus preventing the sealing piston from falling due to loss of power, thereby ensuring the sealing effect of the dome valve.

Description

Technical Field

[0001] This utility model relates to the field of dome valve technology, and in particular to an anti-caking dome valve. Background Technology

[0002] A dome valve is a device used to control the flow of fluids or gases. Inside the dome valve is an elastic, expandable sealing ring. When the sealing ring is inflated, it can form an effective seal, thereby preventing material from clumping or clogging.

[0003] Chinese utility model patent CN220523333U discloses a dome valve controlled by dual solenoid valves, including a dome valve body, an actuating cylinder, an air inlet A, an air inlet B, a two-position five-way solenoid valve, a positioning coupling sleeve, a hemispherical valve core, an inflatable rubber sealing ring, an air guide pipe, a quick exhaust valve, an air guide switch mechanism, a two-position three-way solenoid valve, and a control module. The actuating cylinder is located on the right side of the dome valve body. The top of the actuating cylinder is connected to the air inlet A and the air inlet B, respectively. The air inlet A and the air inlet B are respectively connected to the two-position five-way solenoid valve. The left side of the actuating cylinder is connected to the dome valve body through the positioning coupling sleeve. When the dome valve is opened, the control module sends a signal to the two-position three-way solenoid valve, which cuts off the air supply to the air inlet IN of the air guide valve. The quick exhaust valve quickly discharges the gas in the inflatable rubber sealing ring through the air guide pipe. After the inflatable rubber sealing ring is deflated and retracted, it disengages from the hemispherical valve core.

[0004] During the use of the aforementioned dome valve, when the dome valve is in the closed state, if there is a gas supply failure and a gas interruption occurs, the gas inside the inflatable rubber sealing ring will be discharged through the quick-release valve and the air guide pipe, causing the inflatable rubber sealing ring to contract and create a gap between it and the hemispherical valve core, thereby reducing the sealing effect of the dome valve. Utility Model Content

[0005] To solve the above problems, this utility model provides an anti-caking dome valve.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an anti-caking dome valve, comprising a dome valve body, a circular through hole being provided through the top of the dome valve body, a connecting column being rotatably connected inside the circular through hole, a valve core being rotatably installed inside the circular through hole and fixed to the connecting column, a material conveying through hole being provided through the top of the valve core, an inflatable sealing gasket with an internally hollow annular structure being fixed to the side wall of the circular through hole near the top of the circular through hole, a sealing cylinder being fixed to the dome valve body, an air conveying pipe being provided through and fixed to the side wall of the sealing cylinder near the top of the sealing cylinder, an end of the air conveying pipe away from the sealing cylinder being fixed and communicating with the side wall of the inflatable sealing gasket, a sealing piston being slidably connected inside the air conveying pipe, and a drive mechanism being provided on the dome valve body for driving the inflatable sealing gasket to rotate and the sealing piston to rise or fall, and maintaining self-locking after the inflatable sealing gasket and the sealing piston move.

[0007] By adopting the above technical solution, during the closing process of the dome valve, the driving mechanism drives the sealing cylinder to rotate 90 degrees, and at the same time, drives the sealing piston to rise. During this process, the axis of the material conveying through hole and the axis of the circular through hole move from a coincident state to a mutually perpendicular state. The side wall of the valve core blocks the material and prevents it from passing through the circular through hole. The sealing piston rises and squeezes the air inside the sealing cylinder. The air pressure in the sealing cylinder and the inflatable sealing gasket increases. The side of the inflatable sealing gasket near the valve core expands and presses against the side wall of the valve core, thus achieving the purpose of sealing between the valve core and the circular channel. Since the driving mechanism keeps the sealing piston in a self-locking state after it rises, there will be no situation where the sealing piston loses power and falls, causing the internal pressure of the inflatable sealing gasket to decrease and fail to press against the valve core. This ensures the sealing effect of the dome valve.

[0008] Furthermore, the drive mechanism includes a transmission assembly, which includes a driven column fixed to the side wall of the valve core. The driven column passes through the side wall of the dome valve body and is rotatably connected. The driven column and the connecting column are symmetrically arranged about the axis of the circular groove, and the axis of the driven column coincides with the axis of the connecting column. The transmission assembly also includes a driven gear fixedly sleeved on the driven column, a driving column rotatably mounted on the side wall of the dome valve body and located below the driven column, an incomplete gear fixedly sleeved on the driving column and meshing with the driven gear, a driving gear fixedly sleeved on the driving column, and a rack passing through the bottom of the sealing cylinder and slidably connected. The upper end of the rack is fixed to the bottom of the sealing piston. The rack meshes with the driving gear. The side wall of the incomplete gear is provided with multiple tooth grooves. The arc length formed between the multiple tooth grooves is one-quarter of the circumference of the cross-section of the incomplete gear. The driven gear meshes with one of the tooth grooves. The drive mechanism also includes a drive component for driving the driving column to rotate and for the driving column to be self-locking when stationary.

[0009] By adopting the above technical solution, the driving component drives the active column to rotate, so that the incomplete gear connected to the active column, the active gear connected to the active column, the driven gear meshing with the incomplete gear, the driven column connected to the driven gear, and the valve core connected to the driven column all rotate. Since the active gear and the rack are in a meshing state, the rack drives the sealing piston to rise or fall, and squeezes or expands the space inside the sealing cylinder, thereby achieving the purpose of inflating or deflating the air-filled sealing gasket when the valve core rotates. Furthermore, since the sidewall of the incomplete gear has multiple tooth grooves, the arc length formed between the multiple tooth grooves is one-quarter of the circumference of the cross-section of the incomplete gear. The driven gear meshes with one of the tooth grooves. During the process of the valve core rotating 90 degrees, the driven gear and the tooth groove on the incomplete gear change from a meshing state to a non-meshing state. At this time, the inflatable sealing gasket expands and almost abuts against the sidewall of the valve core. Then, the driving column continues to rotate a certain angle. On the one hand, the driven gear in the non-meshing state will remain stationary, while on the other hand, the driving gear rotates and continues to make the rack drive the sealing piston to move upward a certain distance until the inflatable sealing gasket expands and abuts against the sidewall of the valve core, making the rotation of the valve core smoother.

[0010] Furthermore, the drive assembly includes a mounting box fixed to the dome valve body, a worm gear rotatably mounted inside the mounting box, a drive motor fixed to the mounting box and driving the worm gear to rotate, a rotating column rotatably mounted on the inner wall of the drive motor on the side away from the axis of the dome valve body and coaxially arranged with the driven column, and a worm wheel fixed to one end of the rotating column near the axis of the dome valve body and coaxially arranged with the rotating column. The worm wheel is provided with a connecting mechanism for connecting the rotating column and the driven column.

[0011] By adopting the above technical solution, after the drive motor works, it drives the worm to rotate, which causes the worm wheel meshing with the worm, the rotating column connected to the worm wheel, and the driving column connected to the rotating column through the connecting mechanism to rotate. Due to the self-locking effect between the worm wheel and the worm, it is ensured that the driving column maintains a self-locking state when it is stationary.

[0012] Furthermore, the active column has a sliding groove at one end away from the axis of the dome valve body, and a limiting through hole is provided through the rotating column. The connecting mechanism includes a connecting component, which includes a sliding block slidably installed in the sliding groove, a spring fixed between the sliding block and the sliding groove, a limiting column fixed at one end of the sliding block away from the axis of the dome valve body and connected to the limiting through hole, and a limiting block fixed in the limiting through hole. The limiting blocks are provided in two sets and are symmetrically arranged about the axis of the rotating column. The side wall of the limiting column has a limiting insertion hole extending to both ends of the limiting column. The limiting blocks are inserted into the limiting insertion holes. The number of limiting insertion holes is equal to the number of limiting blocks and their positions correspond one-to-one. The connecting mechanism also includes a displacement component for driving the limiting column to move.

[0013] By adopting the above technical solution, when the drive motor fails to start and the dome valve needs to be closed, the displacement component drives the limit post to move in the direction of the dome valve body axis, so that the sliding block fixed to the limit post moves, the spring is stressed and gradually contracts until the limit hole separates from the limit block. At this time, the active column can be manually rotated and the valve core can be operated to rotate 90 degrees to achieve the purpose of closing the dome valve.

[0014] Furthermore, the displacement assembly includes a rotating block that is rotatably connected to the mounting box, an operating rod that is slidably connected to the rotating block, and a handwheel fixed to the operating rod. The operating rod passes through the rotating column and is slidably connected to it, and the operating rod is fixed to the limiting column.

[0015] By adopting the above technical solution, the operator pushes the handwheel toward the axis of the dome valve body, causing the operating rod fixed to the handwheel and the limiting post connected to the operating rod to move, thereby separating the limiting post from the limiting through hole and ensuring the operation of the dome valve by manual operation.

[0016] Furthermore, a limiting pin is provided through the top of the operating lever and is slidably connected to the operating lever. A limiting block is fixed to the top of the limiting pin, and the side wall of the limiting block abuts against the side wall of the mounting box near the axis of the dome valve body.

[0017] By adopting the above technical solution, the setting of the limit pin and limit block has a good limiting effect, reducing the probability of the operating lever sliding when no manual operation is required.

[0018] Furthermore, an annular baffle is fixed on the side wall of the circular through hole near the top of the circular through hole, and the inner wall of the annular baffle abuts against the side wall of the valve core.

[0019] By adopting the above technical solution, the probability of material caking due to the gap between the dome valve body and the valve core is reduced.

[0020] Furthermore, the distance between the top of the dome valve body and the axis of the dome valve body gradually decreases from top to bottom.

[0021] By adopting the above technical solution, the probability of material accumulating on the top of the dome valve body is reduced.

[0022] In summary, the present invention has the following beneficial effects: In this application, by setting a driving mechanism, the sealing piston is kept in a self-locking state after it rises, so that the sealing piston will not fall after losing power, thereby ensuring the sealing effect of the dome valve. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0024] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure in the middle;

[0025] Figure 3 This is a cross-sectional schematic diagram showing the connection structure between the operating rod and the limiting post after the limiting post and the limiting through hole are separated;

[0026] Figure 4 This is a cross-sectional schematic diagram of an embodiment of the present invention to highlight the internal structure of the sealing cylinder;

[0027] Figure 5 yes Figure 3 Enlarged view of point A in the middle;

[0028] Figure 6 yes Figure 2 Enlarged diagram of point B in the middle.

[0029] In the diagram: 1. Dome valve body; 2. Valve core; 3. Inflatable sealing gasket; 4. Sealing cylinder; 5. Gas supply pipe; 6. Sealing piston; 7. Drive mechanism; 71. Transmission assembly; 711. Driven column; 712. Driven gear; 713. Drive column; 714. Incomplete gear; 715. Drive gear; 716. Rack; 72. Drive assembly; 721. Mounting box; 722. Worm gear; 723. Drive motor; 724. Rotating column; 725. Worm wheel; 8. Connecting mechanism; 81. Connecting assembly; 811. Sliding block; 812. Spring; 813. Limiting column; 814. Limiting through hole; 815. Limiting block; 816. Limiting insertion hole; 82. Displacement assembly; 821. Rotating block; 822. Operating lever; 823. Handwheel; 9. Limiting pin; 10. Limiting block; 11. Annular baffle. Detailed Implementation

[0030] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] like Figure 1-6 As shown in the illustration, this application discloses an anti-caking dome valve, comprising a dome valve body 1, a valve core 2, an inflatable sealing gasket 3, a drive mechanism 7, and a connecting mechanism 8. A circular through-hole is provided through the top of the dome valve body 1. A connecting post is rotatably connected within the circular through-hole, and the valve core 2 is rotatably installed within the circular through-hole. A material conveying through-hole is provided through the top of the valve core 2. The inflatable sealing gasket 3 is fixed to the side wall of the circular through-hole near the top of the circular through-hole and is an annular structure with a hollow interior. A sealing cylinder 4 is fixed to the dome valve body 1. An air conveying pipe 5 is provided through and fixed to the side wall of the sealing cylinder 4 near the top of the sealing cylinder 4. The end of the air conveying pipe 5 away from the sealing cylinder 4 is fixed and connected to the side wall of the inflatable sealing gasket 3, and a sealing piston 6 is slidably connected within the air conveying pipe 5.

[0032] A drive mechanism 7 is mounted on the dome valve body 1. The drive mechanism 7 drives the inflatable sealing gasket 3 to rotate and the sealing piston 6 to rise or fall, and maintains self-locking after the inflatable sealing gasket 3 and sealing piston 6 have moved. The drive mechanism 7 includes a transmission assembly 71 and a drive assembly 72. The transmission assembly 71 includes a driven column 711, a driven gear 712, a driving column 713, an incomplete gear 714, a driving gear 715, and a rack 716. The driven column 711 is fixed to the side wall of the valve core 2 and passes through the side wall of the dome valve body 1 and is rotatably connected. The driven column 711 and the connecting column are symmetrically arranged about the axis of the circular groove, and the axis of the driven column 711 coincides with the axis of the connecting column. The driven gear 712 is fixedly sleeved on the driven column 711. The driving column 713 is rotatably mounted on the side wall of the dome valve body 1 and located below the driven column 711. A sliding groove is formed at the end of the driving column 713 away from the axis of the dome valve body 1. An incomplete gear 714 is fixedly sleeved on the driving post 713 and meshes with the driven gear 712. Multiple tooth grooves are provided on the side wall of the incomplete gear 714. The arc length formed between the multiple tooth grooves is one-quarter of the circumference of the cross-section of the incomplete gear 714. The driven gear 712 meshes with one of the tooth grooves. The driving gear 715 is fixedly sleeved on the driving post 713. A rack 716 passes through the bottom of the sealing cylinder 4 and is slidably connected. The upper end of the rack 716 is fixed to the bottom of the sealing piston 6, and the rack 716 meshes with the driving gear 715.

[0033] The drive assembly 72 is used to drive the drive column 713 to rotate and to lock the drive column 713 in a self-locking state when it is stationary. The drive assembly 72 includes a mounting box 721, a worm gear 722, a drive motor 723, a rotating column 724, and a worm wheel 725. The mounting box 721 is fixed to the dome valve body 1, and the worm gear 722 is rotatably mounted inside the mounting box 721. The drive motor 723 is fixed to the mounting box 721 and drives the worm gear 722 to rotate. The rotating column 724 is rotatably mounted on the inner wall of the drive motor 723 on the side away from the axis of the dome valve body 1 and is coaxially arranged with the driven column 711. A limit hole 814 is provided through the rotating column 724. The worm wheel 725 is fixed to the end of the rotating column 724 near the axis of the dome valve body 1 and is coaxially arranged with the rotating column 724.

[0034] During the closing process of the dome valve, the drive motor 723 drives the worm gear 722 to rotate, causing the worm wheel 725 meshing with the worm gear 722, the rotating column 724 connected to the worm wheel 725, the driving column 713 connected to the rotating column 724 through the connecting mechanism 8, the incomplete gear 714 connected to the driving column 713, the driving gear 715 connected to the driving column 713, the driven gear 712 meshing with the incomplete gear 714, the driven column 711 connected to the driven gear 712, and the valve core 2 connected to the driven column 711 to rotate. During this process, the axis of the material conveying through hole and the axis of the circular through hole move from a coincident state to a mutually perpendicular state. At this time, the side wall of the valve core 2 blocks the material and prevents it from passing through the circular through hole, thereby achieving the purpose of closing the dome valve. During the rotation of the drive gear 715, the rack 716 meshing with the drive gear 715 drives the sealing piston 6 to rise and compress the air inside the sealing cylinder 4. The inflatable sealing gasket 3 expands on the side near the valve core 2 and presses against the side wall of the valve core 2, thus achieving the purpose of sealing between the valve core 2 and the circular channel. Due to the self-locking effect between the worm gear 725 and the worm 722, the sealing piston 6 remains stationary when the drive motor 723 is de-energized. This prevents the sealing piston 6 from descending and causing the pressure inside the sealing cylinder 4 and the inflatable sealing gasket 3 to decrease, which would result in the inflatable sealing gasket 3 and the valve core 2 failing to press against each other, thus ensuring the sealing effect of the dome valve.

[0035] A connecting mechanism 8 is mounted on the worm gear 725 and is used to connect the rotating column 724 to the driven column 711. The connecting mechanism 8 includes a connecting component 81 and a displacement component 82. The connecting component 81 includes a sliding block 811, a spring 812, a limiting post 813, and a limiting block 815. The sliding block 811 is slidably installed in the sliding groove, and the spring 812 is fixed between the sliding block 811 and the sliding groove. The limiting post 813 is fixed to one end of the sliding block 811 away from the axis of the dome valve body 1 and is inserted into the limiting through hole 814. The side wall of the limiting post 813 has limiting insertion holes 816 extending to both ends of the limiting post 813, and the limiting block 815 is fixed in the limiting through hole 814. Two sets of limit plugs 815 are provided and are symmetrically arranged about the axis of the rotating column 724. The limit plugs 815 are plugged into the limit holes 816. The number of limit holes 816 is equal to the number of limit plugs 815 and their positions correspond one-to-one.

[0036] The displacement assembly 82 is used to drive the limiting post 813 to move. The displacement assembly 82 includes a rotating block 821, an operating rod 822, and a handwheel 823. The rotating block 821 is rotatably connected to the mounting box 721, and the operating rod 822 is slidably connected to the rotating block 821. The operating rod 822 is slidably connected to the rotating post 724, and is fixed to the limiting post 813. The handwheel 823 is fixed to the operating rod 822.

[0037] When the drive motor 723 malfunctions and cannot start, and the valve core 2 needs to be closed, push the handwheel 823 to move in the direction of the axis of the dome valve body 1. This causes the operating rod 822 fixed to the handwheel 823, the limiting post 813 connected to the operating rod 822, and the sliding block 811 fixed to the limiting post 813 to all move. The spring 812 is stressed and gradually contracts until the limiting hole 816 separates from the limiting block 815. At this time, the drive post 713 can be manually rotated and the valve core 2 can be rotated 90 degrees to achieve the purpose of closing the dome valve.

[0038] A limiting pin 9 is slidably connected to the top of the operating lever 822. A limiting block 10 is fixed to the top of the limiting pin 9, and the side wall of the limiting block 10 abuts against the side wall of the mounting box 721 near the axis of the dome valve body 1. The limiting pin 9 and the limiting block 10 provide a good limiting effect, reducing the probability of the operating lever 822 sliding when no manual operation is required.

[0039] An annular baffle 11 is fixed to the side wall of the circular through-hole near the top of the through-hole, and the inner wall of the annular baffle 11 abuts against the side wall of the valve core 2. This reduces the probability of material caking due to material flowing into the gap between the dome valve body 1 and the valve core 2.

[0040] The distance between the top of the dome valve body 1 and its axis gradually decreases from top to bottom. This reduces the probability of material accumulating on the top of the dome valve body 1.

[0041] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An anti-caking dome valve, comprising a dome valve body (1), wherein a circular through hole is provided through the top of the dome valve body (1), a connecting column is rotatably connected to the circular through hole, a valve core (2) fixed to the connecting column is rotatably installed in the circular through hole, and a material conveying through hole is provided through the top of the valve core (2), characterized in that: An air-filled sealing gasket (3) with an internally hollow annular structure is fixed on the side wall of the circular through hole near the top of the circular through hole. A sealing cylinder (4) is fixed on the dome valve body (1). An air supply pipe (5) is passed through and fixed on the side wall of the sealing cylinder (4) near the top of the sealing cylinder (4). The end of the air supply pipe (5) away from the sealing cylinder (4) is fixed and connected to the side wall of the air-filled sealing gasket (3). A sealing piston (6) is slidably connected inside the air supply pipe (5). A drive mechanism (7) is provided on the dome valve body (1) for driving the air-filled sealing gasket (3) to rotate and the sealing piston (6) to rise or fall, and for maintaining self-locking after the air-filled sealing gasket (3) and the sealing piston (6) move.

2. The anti-caking dome valve according to claim 1, characterized in that: The drive mechanism (7) includes a transmission assembly (71), which includes a driven column (711) fixed to the side wall of the valve core (2). The driven column (711) passes through the side wall of the dome valve body (1) and is rotatably connected. The driven column (711) and the connecting column are symmetrically arranged about the axis of the circular groove. The axis of the driven column (711) coincides with the axis of the connecting column. The transmission assembly (71) also includes a driven gear (712) fixedly sleeved on the driven column (711), an active column (713) rotatably mounted on the side wall of the dome valve body (1) and located below the driven column (711), and an incomplete gear (714) fixedly sleeved on the active column (713) and meshing with the driven gear (712). The drive gear (715) is fixedly sleeved on the drive column (713) and the rack (716) is slidably connected to the bottom of the sealing cylinder (4). The upper end of the rack (716) is fixed to the bottom of the sealing piston (6). The rack (716) meshes with the drive gear (715). The side wall of the incomplete gear (714) is provided with multiple tooth grooves. The arc length formed between the multiple tooth grooves is one-quarter of the circumference of the cross section of the incomplete gear (714). The driven gear (712) meshes with one of the tooth grooves. The drive mechanism (7) also includes a drive assembly (72) for driving the drive column (713) to rotate and for keeping the drive column (713) in a self-locking state when the drive column (713) is stationary.

3. The anti-caking dome valve according to claim 2, characterized in that: The drive assembly (72) includes a mounting box (721) fixed on the dome valve body (1), a worm gear (722) rotatably mounted in the mounting box (721), a drive motor (723) fixed on the mounting box (721) and driving the worm gear (722) to rotate, a rotating column (724) rotatably mounted on the inner wall of the drive motor (723) away from the axis of the dome valve body (1) and coaxially arranged with the driven column (711), and a worm wheel (725) fixed on one end of the rotating column (724) near the axis of the dome valve body (1) and coaxially arranged with the rotating column (724). The worm wheel (725) is provided with a connecting mechanism (8) for connecting the rotating column (724) and the driven column (711).

4. The anti-caking dome valve according to claim 3, characterized in that: The active column (713) has a sliding groove at one end away from the axis of the dome valve body (1), and a limit hole (814) is provided through the rotating column (724). The connecting mechanism (8) includes a connecting component (81), which includes a sliding block (811) slidably installed in the sliding groove, a spring (812) fixed between the sliding block (811) and the sliding groove, a limit column (813) fixed at one end of the sliding block (811) away from the axis of the dome valve body (1) and inserted into the limit hole (814), and a limit post (813) fixed to the end of the sliding block (811) away from the axis of the dome valve body (1). The limiting through hole (814) contains a limiting plug (815), and the limiting plug (815) is provided in two sets and is symmetrically arranged about the axis of the rotating column (724). The side wall of the limiting column (813) is provided with limiting holes (816) extending to both ends of the limiting column (813). The limiting plug (815) and the limiting hole (816) are plugged into each other. The number of limiting holes (816) is equal to the number of limiting plugs (815) and their positions correspond one-to-one. The connecting mechanism (8) also includes a displacement component (82) for driving the displacement of the limiting column (813).

5. The anti-caking dome valve according to claim 4, characterized in that: The displacement component (82) includes a rotating block (821) that is rotatably connected to the mounting box (721), an operating rod (822) that is slidably connected to the rotating block (821), and a handwheel (823) fixed to the operating rod (822). The operating rod (822) is slidably connected to the rotating column (724), and the operating rod (822) is fixed to the limiting column (813).

6. The anti-caking dome valve according to claim 5, characterized in that: The top of the operating lever (822) is provided with a limiting pin (9) that is slidably connected to the operating lever (822). The top of the limiting pin (9) is fixed with a limiting block (10). The side wall of the limiting block (10) abuts against the side wall of the mounting box (721) near the axis of the dome valve body (1).

7. The anti-caking dome valve according to claim 1, characterized in that: An annular baffle (11) is fixed on the side wall of the circular through hole near the top of the circular through hole, and the inner wall of the annular baffle (11) abuts against the side wall of the valve core (2).

8. The anti-caking dome valve according to claim 1, characterized in that: The distance between the top of the dome valve body (1) and the axis of the dome valve body (1) gradually decreases from top to bottom.

Images