A ball valve that is convenient to replace and its replacement method

Abstract

The present invention belongs to the technical field of ball valves, in particular to a ball valve that is convenient to replace and a method for replacing the same, including a valve body and connecting main pipes fixedly communicated at both ends of the valve body. A throttling device for blocking between the connecting main pipe and the valve body is respectively arranged on the inner walls of the connecting main pipes, and a docking device for disassembling and replacing the valve body is arranged between the valve body and the connecting main pipes. For this ball valve that is convenient to replace and the method for replacing the same, by arranging the throttling device, when it is necessary to replace the valve body, the connecting main pipe can be blocked by six throttling blades to block the water body, facilitating the replacement of the valve body by the staff. By arranging the docking device, the connection between the valve body and the connecting main pipe can be realized through simple operations, achieving the effect of quickly replacing the valve body.

Description

Technical Field

[0001] The present invention relates to the technical field of ball valves, and particularly relates to a ball valve that is convenient to replace and a method for replacing the same. Background Technique

[0002] A ball valve is a valve in which the closing member (ball) is driven by a valve stem and rotates around the axis of the ball valve. It can also be used for the regulation and control of fluids. Among them, the hard-sealed V-type ball valve has a strong shearing force between its V-type ball core and the metal valve seat with surfacing hard alloy, and is particularly suitable for media containing fibers, tiny solid particles, etc. The multi-way ball valve can not only flexibly control the confluence, shunt, and flow direction switching of the medium on the pipeline, but also close any channel to connect the other two channels. Generally, this type of valve should be installed horizontally in the pipeline;

[0003] After the ball valve is installed inside the water pipe and used for a long time, the ball valve may be damaged and needs to be replaced. When replacing the existing ball valve, usually, welding plugging joints are installed at both ends of the ball valve, the water pipe with the plugging joints is cut off, the expansion cylinder is installed inside the water pipe, and then the section of the water pipe with the ball valve is cut off and the replaced water pipe is re-welded. Many auxiliary tools are required, and the operation is cumbersome, which is not convenient for replacing the ball valve. Summary of the Invention

[0004] Based on the technical problem that the existing ball valve needs to go through complex processes, requires many auxiliary tools, and has a cumbersome operation when being replaced, which is not convenient for replacing the ball valve, the present invention provides a ball valve that is convenient to replace and a method for replacing the same.

[0005] The ball valve that is convenient to replace and the method for replacing the same provided by the present invention include a valve body and connecting main pipes fixedly communicated at both ends of the valve body. The inner walls of the connecting main pipes are respectively provided with a shut-off device for blocking between the connecting main pipes and the valve body, and a docking device for disassembling and replacing the valve body is arranged between the valve body and the connecting main pipes;

[0006] The shut-off device includes a protective disk fixed to the inner wall of the connecting main pipe. An annular cavity for installing a shut-off mounting disk is formed on the inner wall of the protective disk. Six plugging grooves distributed in an annular array are formed on one side inner wall of the shut-off mounting disk;

[0007] The docking device includes a first connection disk fixed to one end of the connecting main pipe and a second connection disk fixed to one end of the valve body.

[0008] Preferably, a toothed ring is arranged on the inner wall of the shut-off mounting disk. A guiding groove in a hexagonal structure is formed on one end surface of the toothed ring, and six shut-off blades distributed in an annular array are arranged at one end of the toothed ring;

[0009] Through the above technical solution, the connection main pipe can be blocked by splicing six intercepting blades, thereby preventing water loss during the process of replacing the valve body and hindering the staff from replacing the valve body.

[0010] Preferably, two docking blocks are fixedly connected to one side surface of the intercepting blade and are symmetrically distributed up and down. Two docking grooves are formed on the other side surface of the intercepting blade and are symmetrically distributed up and down. The docking blocks on each intercepting blade are slidably inserted into the docking grooves on the adjacent intercepting blades;

[0011] Through the above technical solution, cross support can be realized between each adjacent intercepting blade through the cooperation of the docking block and the docking groove, avoiding the extrusion of water on the intercepting blade and causing the effect of damage to the intercepting blade.

[0012] Preferably, a sealing sleeve for sealing between the two intercepting blades is movably sleeved on the outer surface of the docking block. A stepped cavity is formed on one side surface of each intercepting blade. A uniformly distributed telescopic sleeve is fixedly connected to the inner bottom wall of the stepped cavity. A T-shaped support rod is movably sleeved on the inner wall of the telescopic sleeve;

[0013] Through the above technical solution, after the sealing sleeve is sleeved on the outside of the docking block and the docking block is inserted into the docking groove, the sealing sleeve can seal between the docking block and the docking groove and buffer the water pressure.

[0014] Preferably, a return spring is fixedly connected to the lower surface of the T-shaped support rod. The free end of the return spring is fixedly connected to the inner bottom wall of the telescopic sleeve. A buffer plate made of soft wood board is movably sleeved on the upper end inner wall of the stepped cavity. A sealing layer made of rubber is fixedly connected to one side surface of the buffer plate, and the outer periphery of the sealing layer is fixedly connected to the inner wall of the stepped cavity;

[0015] Through the above technical solution, when the buffer plate is squeezed by water, the buffer plate can be controlled to move in the stepped cavity, thereby buffering a part of the water pressure, and further buffering the water pressure through the return spring.

[0016] Preferably, a guide post and a guide block are respectively fixedly connected to both side surfaces of the intercepting blade. The outer surface of the guide post is slidably inserted into the inner wall of the insertion slot, and the outer surface of the guide block is slidably inserted into the inner wall of the guide groove;

[0017] Through the above technical solution, the cooperation of the guide post and the insertion slot and the cooperation of the guide block and the guide groove can control the angular deflection of the intercepting blade when the toothed ring rotates, thereby realizing the blocking and conduction of the connection main pipe.

[0018] Preferably, a protective box is fixedly connected to the upper end of the protective disc, and a servo motor is fixedly installed on one inner wall of the protective box. A driving gear meshing with the toothed ring is fixedly sleeved on the outer surface of the main shaft of the servo motor;

[0019] Through the above technical solution, the servo motor can be installed and protected by the protective box, and the driving gear can be controlled by the servo motor to rotate, thereby driving the toothed ring to rotate.

[0020] Preferably, six arc-shaped plates distributed in a circular array are fixedly connected to one side surface of the second connecting disc, and a threaded hole penetrating to the other side surface of the second connecting disc is opened on one side surface of the second connecting disc;

[0021] Through the above technical solution, the second connecting disc can be better connected to the first connecting disc through the arc-shaped plates.

[0022] Preferably, a matching groove for the arc-shaped plate to be movably inserted and a mounting hole for installing the connecting screw are opened on one side surface of the first connecting disc. A connecting groove is opened on the outer surface of one end of the connecting screw, and a meshing gear is fixedly sleeved on the inner wall of the connecting groove. A driving ring meshing with the plurality of meshing gears is arranged on one side of the first connecting disc. A sealing insertion ring is fixedly connected to one end surface of the second connecting disc, and a connecting card slot matching with the outer surface of the sealing insertion ring is opened on one end surface of the first connecting disc;

[0023] Through the above technical solution, the connecting screw can be installed through the mounting hole, so that the connecting screw can rotate in place in the mounting hole, and the rotation of the driving ring drives the plurality of meshing gears meshing with it to rotate synchronously, thereby driving the connecting screw.

[0024] Preferably, a replacement method is provided: Step 1. When the ball valve needs to be replaced, the staff energizes the servo motor to drive the driving gear to rotate. When the driving gear rotates, it drives the toothed ring meshing with it to rotate. Since during the rotation of the toothed ring, the cooperation between the guide post and the insertion slot and the cooperation between the guide block and the guide slot cause the intercepting blade to generate transmission, controlling the six intercepting blades to simultaneously contract towards the middle of the connecting main pipe. At the same time, the docking block cooperates with the docking groove and the sealing sleeve outside the docking block seals between each adjacent intercepting blade to prevent water from overflowing from the adjacent sides of the intercepting blade;

[0025] Step 2: After the connection main pipe is blocked by the intercepting device, the water pressure at one end of the connection main pipe will act completely on the intercepting blades, and the water pressure will squeeze the buffer plate, causing the buffer plate to push the T-shaped support rod to buffer the water pressure. The sealing layer is used to prevent water from entering the stepped cavity, so that water cannot enter the stepped cavity, and then quickly complete the blocking of the water in the connection main pipe;

[0026] Step 3: The staff rotates the driving ring, and the rotation of the driving ring drives the six meshing gears engaged with the driving ring to rotate, thereby driving the connecting screw rod to rotate. Since the connecting screw rod is movably installed on the inner wall of the mounting hole, the connecting screw rod will not generate displacement during rotation, and the end of the connecting screw rod is disconnected from the threaded port, and then the valve body can be removed;

[0027] Step 4: Insert the arc-shaped plate of the replaced valve body into the mating groove of the first connection plate through the second connection plate, and dock the connecting screw rod with the threaded port. Rotate the driving ring, and the rotation of the driving ring drives the six meshing gears engaged with the driving ring to rotate, thereby driving the connecting screw rod to rotate. Since the connecting screw rod is movably installed on the inner wall of the mounting hole, the connecting screw rod will not generate displacement during rotation, so that the end of the connecting screw rod is threadedly connected to the threaded port, and the sealing plug ring is matched with the connecting card slot to realize the sealing between the first connection plate and the second connection plate, and then the replacement of the valve body can be completed. Subsequently, control the intercepting device to cancel the blocking of the connection main pipe.

[0028] The beneficial effects of the present invention are as follows:

[0029] 1. By setting the intercepting device, when the valve body needs to be replaced, the connection main pipe can be blocked by six intercepting blades to block the water body, which is convenient for the staff to replace the valve body. Specifically, the servo motor drives the driving gear to rotate, and when the driving gear rotates, it drives the engaged toothed ring to rotate. During the rotation of the toothed ring, the intercepting blades are driven due to the cooperation of the guide post and the insertion slot and the cooperation of the guide block and the guide groove, and the six intercepting blades are controlled to contract simultaneously towards the middle of the connection main pipe to complete the blocking of the connection main pipe.

[0030] 2. By setting the docking device, the connection between the valve body and the connection main pipe can be realized through simple operations, and the valve body can be quickly replaced. Specifically, the rotation of the driving ring drives the six meshing gears engaged with the driving ring to rotate, thereby driving the connecting screw rod to rotate. Since the connecting screw rod is movably installed on the inner wall of the mounting hole, the connecting screw rod will not generate displacement during rotation, so that the connecting screw rod is screwed into or out of the threaded port to control the connection between the first connection plate and the second connection plate. Description of the Drawings

[0031] Figure 1 Schematic diagram of a ball valve that is convenient to replace and its replacement method proposed by the present invention;

[0032] Figure 2 Cross-sectional view of the connecting main pipe structure of a ball valve that is convenient to replace and its replacement method proposed by the present invention;

[0033] Figure 3 Cross-sectional view of the mounting plate structure of a ball valve that is convenient to replace and its replacement method proposed by the present invention;

[0034] Figure 4 Three-dimensional view of the mounting plate structure of a ball valve that is convenient to replace and its replacement method proposed by the present invention;

[0035] Figure 5 Three-dimensional view of the insertion slot structure of a ball valve that is convenient to replace and its replacement method proposed by the present invention;

[0036] Figure 6 Three-dimensional view of the flow intercepting device of a ball valve that is convenient to replace and its replacement method proposed by the present invention;

[0037] Figure 7 Three-dimensional view of the flow intercepting blade structure of a ball valve that is convenient to replace and its replacement method proposed by the present invention;

[0038] Figure 8 Partial cross-sectional view of the flow intercepting blade structure of a ball valve that is convenient to replace and its replacement method proposed by the present invention;

[0039] Figure 9 Cross-sectional view of the telescopic sleeve structure of a ball valve that is convenient to replace and its replacement method proposed by the present invention;

[0040] Figure 10 Three-dimensional view of the docking device of a ball valve that is convenient to replace and its replacement method proposed by the present invention;

[0041] Figure 11 Partial cross-sectional view of the docking device of a ball valve that is convenient to replace and its replacement method proposed by the present invention;

[0042] Figure 12 Exploded view of the docking device of a ball valve that is convenient to replace and its replacement method proposed by the present invention;

[0043] Figure 13 Three-dimensional view of the connecting screw structure of a ball valve that is convenient to replace and its replacement method proposed by the present invention.

[0044] In the figure: 1. Valve body; 2. Connecting main pipe; 3. Protection disc; 31. Mounting disc; 32. Annular cavity; 33. Insertion slot; 34. Tooth ring; 35. Guide slot; 36. Shut-off blade; 37. Docking block; 38. Docking groove; 39. Sealing sleeve; 310. Step cavity; 311. Telescopic sleeve; 312. T-shaped support rod; 313. Return spring; 314. Buffer plate; 315. Sealing layer; 316. Guide post; 317. Guide block; 318. Protection box; 319. Servo motor; 320. Driving gear; 4. First connection disc; 41. Second connection disc; 42. Arc plate; 43. Threaded port; 44. Fitting groove; 45. Mounting hole; 46. Connecting screw; 47. Connection groove; 48. Meshing gear; 49. Driving ring; 410. Sealing insertion ring; 411. Connection card slot. Detailed implementation mode

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0046] Refer to Figures 1-13 , a ball valve convenient for replacement and its replacement method, including a valve body 1 and connecting main pipes 2 fixedly connected and communicated at both ends of the valve body 1. Shut-off devices for blocking between the connecting main pipe 2 and the valve body 1 are respectively arranged on the inner walls of the connecting main pipes 2, and a docking device for disassembling and replacing the valve body 1 is arranged between the valve body 1 and the connecting main pipe 2.

[0047] As Figures 1-9 shown, in order to intercept water when replacing the valve body 1, a shut-off device is provided. The shut-off device includes a protection disc 3 fixed on the inner wall of the connecting main pipe 2. In order to install the shut-off mounting disc 31, an annular cavity 32 for installing the shut-off mounting disc 31 is opened on the inner wall of the protection disc 3. Further, in order to install and guide the shut-off blades 36 inside the shut-off device, six insertion slots 33 distributed in an annular array are opened on one side inner wall of the shut-off mounting disc 31, and a tooth ring 34 is arranged on the inner wall of the shut-off mounting disc 31. In order to further guide and install the shut-off blades 36, a hexagonal-structured guide slot 35 is opened on the end surface of one end of the tooth ring 34, and six shut-off blades 36 distributed in an annular array are arranged at one end of the tooth ring 34. The connecting main pipe 2 is blocked by the splicing of the six shut-off blades 36, thereby preventing water loss during the replacement of the valve body 1 and preventing the staff from replacing the valve body 1.

[0048] Further, in order to support the ends of each flow interception blade 36, two docking blocks 37 symmetrically distributed up and down are fixedly connected to one side surface of the flow interception blade 36. Further, two docking grooves 38 symmetrically distributed up and down are formed in the other side surface of the flow interception blade 36, so that the docking blocks 37 on each flow interception blade 36 are slidably inserted into the docking grooves 38 on the adjacent flow interception blades 36. Through the cooperation of the docking blocks 37 and the docking grooves 38, cross support is realized between each adjacent flow interception blade 36, avoiding the extrusion of the water body on the flow interception blade 36 and causing the damage of the flow interception blade 36.

[0049] In order to further seal between the flow interception blades 36 and prevent water from flowing out through the gaps between the flow interception blades 36, a sealing sleeve 39 for sealing between the two flow interception blades 36 is movably sleeved on the outer surface of the docking block 37. Further, in order to buffer the water pressure after the flow interception blade 36 intercepts the connecting main pipe 2, a stepped cavity 310 is formed in one side surface of each flow interception blade 36, and uniformly distributed telescopic sleeves 311 are fixedly connected to the inner bottom wall of the stepped cavity 310, so that a T-shaped support rod 312 is movably sleeved in the inner wall of the telescopic sleeve 311. The sealing sleeve 39 can be sleeved outside the docking block 37, and after the docking block 37 is inserted into the docking groove 38, the docking block 37 and the docking groove 38 are sealed by the sealing sleeve 39, and the water pressure is buffered.

[0050] In order to drive the buffer plate 314 to reset after the buffer plate 314 loses extrusion, a reset spring 313 is fixedly connected to the lower surface of the T-shaped support rod 312, and the free end of the reset spring 313 is fixedly connected to the inner bottom wall of the telescopic sleeve 311. The upper end inner wall of the stepped cavity 310 is movably sleeved with a buffer plate 314 made of cork. The buffer plate 314 made of cork enables the buffer plate 314 to deform and rebound slightly. Further, in order to prevent water from entering the stepped cavity 310, a sealing layer 315 made of rubber is fixedly connected to one side surface of the buffer plate 314, and the outer periphery of the sealing layer 315 is fixedly connected to the inner wall of the stepped cavity 310. When the buffer plate 314 is squeezed by the water body, the movement of the buffer plate 314 in the stepped cavity 310 can be controlled, thereby buffering a part of the water pressure, and the water pressure is further buffered by the reset spring 313.

[0051] To control the moving direction of the intercepting blade 36, a guiding column 316 and a guiding block 317 are fixedly connected to the two side surfaces of the intercepting blade 36 respectively. The outer surface of the guiding column 316 is slidably inserted into the inner wall of the inserting groove 33, and the outer surface of the guiding block 317 is slidably inserted into the inner wall of the guiding groove 35. By the cooperation of the guiding column 316 and the inserting groove 33 and the cooperation of the guiding block 317 and the guiding groove 35, when the toothed ring 34 rotates, the intercepting blade 36 can be controlled to generate an angular deflection, thereby realizing the blocking and conduction of the connecting main pipe 2.

[0052] To install and protect the servo motor 319, a protective box 318 is fixedly connected to the upper end of the protective disc 3. A servo motor 319 is fixedly installed on one inner wall of the protective box 318. Further, to drive the toothed ring 34 to rotate, a driving gear 320 meshing with the toothed ring 34 is fixedly sleeved on the outer surface of the main shaft of the servo motor 319. The protective box 318 can be used to install the servo motor 319 and protect the servo motor 319. By controlling the driving gear 320 to rotate through the servo motor 319, the toothed ring 34 can be driven to rotate.

[0053] By setting the intercepting device, when the valve body 1 needs to be replaced, the connecting main pipe 2 can be blocked by six intercepting blades 36 to block the water body, facilitating the replacement of the valve body 1 by the staff. Specifically, the servo motor 319 drives the driving gear 320 to rotate. When the driving gear 320 rotates, it drives the toothed ring 34 meshing with it to rotate. During the rotation of the toothed ring 34, the cooperation of the guiding column 316 and the inserting groove 33 and the cooperation of the guiding block 317 and the guiding groove 35 cause the intercepting blade 36 to transmit, controlling the six intercepting blades 36 to simultaneously contract towards the middle of the connecting main pipe 2 to complete the blocking of the connecting main pipe 2.

[0054] As Figures 1-3 and Figures 10-13 shown, to enable the valve body 1 to be quickly disassembled and installed with the connecting main pipe 2, a docking device is provided. The docking device includes a first connection disc 4 fixed to one end of the connecting main pipe 2 and a second connection disc 41 fixed to one end of the valve body 1. To better connect the first connection disc 4 and the second connection disc 41, six arc-shaped plates 42 distributed in a circular array are fixedly connected to one side surface of the second connection disc 41. To connect the first connection disc 4 and the second connection disc 41 together, a threaded opening 43 penetrating through to the other side surface of the second connection disc 41 is opened on one side surface of the second connection disc 41. The arc-shaped plates 42 can enable the second connection disc 41 to be better connected with the first connection disc 4.

[0055] Further, in order to control the connection between the arc-shaped plate 42 and the first connection disk 4, a mating groove 44 for the movable insertion of the arc-shaped plate 42 and a mounting hole 45 for mounting the connection screw 46 are provided on one side surface of the first connection disk 4. In order to drive the six connection screws 46 to rotate synchronously, a connection groove 47 is provided on the outer surface of one end of the connection screw 46, and a meshing gear 48 is fixedly sleeved on the inner wall of the connection groove 47. Further, a driving ring 49 meshing and driving with a plurality of meshing gears 48 is provided on one side of the first connection disk 4. In order to seal between the first connection disk 4 and the second connection disk 41, a sealing insertion ring 410 is fixedly connected to one end surface of the second connection disk 41, so that a connection card slot 411 matching with the outer surface of the sealing insertion ring 410 is provided on one end surface of the first connection disk 4. The connection screw 46 can be installed through the mounting hole 45, so that the connection screw 46 can rotate in place in the mounting hole 45, and the rotation of the driving ring 49 drives a plurality of meshing gears 48 meshing with it to rotate synchronously, thereby driving the connection screw 46.

[0056] By providing the docking device, the connection between the valve body 1 and the connection main pipe 2 can be realized through simple operations, and the valve body 1 can be quickly replaced. Specifically, the rotation of the driving ring 49 drives the six meshing gears 48 meshing with the driving ring 49 to rotate, thereby driving the connection screw 46 to rotate. Since the connection screw 46 is movably installed on the inner wall of the mounting hole 45, the connection screw 46 will not generate displacement during rotation, so that the connection screw 46 is screwed into or out of the thread port 43 to control the connection between the first connection disk 4 and the second connection disk 41.

[0057] Working principle: Step 1. When the ball valve needs to be replaced, the staff powers on the servo motor 319, so that the servo motor 319 drives the driving gear 320 to rotate. When the driving gear 320 rotates, it drives the tooth ring 34 meshing with it to rotate. Since during the rotation of the tooth ring 34, the cooperation between the guide post 316 and the insertion slot 33 and the cooperation between the guide block 317 and the guide slot 35 cause the throttling blades 36 to generate transmission, controlling the six throttling blades 36 to simultaneously contract towards the middle of the connection main pipe 2. At the same time, the docking block 37 and the docking slot 38 cooperate, and the sealing sleeve 39 outside the docking block 37 seals between each adjacent throttling blade 36 to prevent water from overflowing from the adjacent sides of the throttling blades 36;

[0058] Step 2: After the intercepting device blocks the connecting main pipe 2, the water pressure at one end of the connecting main pipe 2 will act completely on the intercepting blade 36. The water pressure squeezes the buffer plate 314, causing the buffer plate 314 to push the T-shaped support rod 312 to buffer the water pressure. The sealing layer 315 prevents water from entering the stepped cavity 310, so that water cannot enter the stepped cavity 310, and then quickly completes the blocking of the water in the connecting main pipe 2.

[0059] Step 3: The staff rotates the driving ring 49. The rotation of the driving ring 49 drives the six meshing gears 48 meshing with the driving ring 49 to rotate, and then drives the connecting screw 46 to rotate. Since the connecting screw 46 is movably installed on the inner wall of the mounting hole 45, the connecting screw 46 will not displace during rotation. The end of the connecting screw 46 is disconnected from the threaded port 43, and then the valve body 1 can be removed.

[0060] Step 4: Insert the arc-shaped plate 42 of the replaced valve body 1 into the mating groove 44 of the first connection plate 4 through the second connection plate 41, and align the connecting screw 46 with the threaded port 43. Rotate the driving ring 49. The rotation of the driving ring 49 drives the six meshing gears 48 meshing with the driving ring 49 to rotate, and then drives the connecting screw 46 to rotate. Since the connecting screw 46 is movably installed on the inner wall of the mounting hole 45, the connecting screw 46 will not displace during rotation. The end of the connecting screw 46 is threadedly connected to the threaded port 43, and the sealing insert ring 410 and the connecting card slot 411 are matched to seal between the first connection plate 4 and the second connection plate 41, thus completing the replacement of the valve body 1. Then control the intercepting device to cancel the blocking of the connecting main pipe 2.

[0061] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A ball valve that is convenient to replace, comprising a valve body (1) and connecting main pipes (2) fixedly communicated at both ends of the valve body (1), characterized in that: The inner walls of the connecting main pipe (2) are respectively provided with a throttling device for blocking between the connecting main pipe (2) and the valve body (1), and a docking device for disassembling and replacing the valve body (1) is arranged between the valve body (1) and the connecting main pipe (2); Throttling device, the throttling device includes a protective disc (3) fixed to the inner wall of the connecting main pipe (2), an annular cavity (32) for installing a throttling installation disc (31) is opened on the inner wall of the protective disc (3), six plugging slots (33) distributed in an annular array are opened on one side inner wall of the throttling installation disc (31), a toothed ring (34) is arranged on the inner wall of the throttling installation disc (31), a guiding groove (35) in a hexagonal structure is opened on one end surface of the toothed ring (34), six throttling blades (36) distributed in an annular array are arranged at one end of the toothed ring (34), two docking blocks (37) distributed symmetrically up and down are fixedly connected to one side surface of the throttling blade (36), two docking slots (38) distributed symmetrically up and down are opened on the other side surface of the throttling blade (36), and the docking blocks (37) on each throttling blade (36) are slidably plugged into the docking slots (38) on the adjacent throttling blade (36); Two guiding columns (316) and guiding blocks (317) are respectively fixedly connected to both side surfaces of the throttling blade (36), the outer surface of the guiding column (316) is slidably plugged into the inner wall of the plugging slot (33), and the outer surface of the guiding block (317) is slidably plugged into the inner wall of the guiding groove (35); Docking device, the docking device includes a first connection disc (4) fixed to one end of the connecting main pipe (2) and a second connection disc (41) fixed to one end of the valve body (1), six arc-shaped plates (42) distributed in an annular array are fixedly connected to one side surface of the second connection disc (41), a threaded port (43) penetrating through to the other side surface of the second connection disc (41) is opened on one side surface of the second connection disc (41), a matching groove (44) for slidably plugging the arc-shaped plate (42) and an installation hole (45) for installing a connecting screw (46) are opened on one side surface of the first connection disc (4), a connecting groove (47) is opened on the outer surface of one end of the connecting screw (46), a meshing gear (48) is fixedly sleeved on the inner wall of the connecting groove (47), a driving ring (49) meshing and driving with a plurality of the meshing gears (48) is arranged on one side of the first connection disc (4), a sealing plug ring (410) is fixedly connected to one end surface of the second connection disc (41), and a connection card slot (411) matching with the outer surface of the sealing plug ring (410) is opened on one end surface of the first connection disc (4).

2. The ball valve that is convenient to replace according to claim 1, wherein: The outer surface of the docking block (37) is movably sleeved with a sealing sleeve (39) for sealing between the two intercepting blades (36). A stepped cavity (310) is formed on one side surface of each intercepting blade (36). The inner bottom wall of the stepped cavity (310) is fixedly connected with uniformly distributed telescopic sleeves (311). The inner wall of the telescopic sleeve (311) is movably sleeved with a T-shaped support rod (312).

3. The ball valve that is convenient to replace according to claim 2, wherein: The lower surface of the T-shaped support rod (312) is fixedly connected with a return spring (313). The free end of the return spring (313) is fixedly connected with the inner bottom wall of the telescopic sleeve (311). The upper end inner wall of the stepped cavity (310) is movably sleeved with a buffer plate (314) made of cork. One side surface of the buffer plate (314) is fixedly connected with a sealing layer (315) made of rubber. The outer periphery of the sealing layer (315) is fixedly connected with the inner wall of the stepped cavity (310).

4. The ball valve that is convenient for replacement according to claim 3, wherein: The upper end of the protective disc (3) is fixedly connected with a protective box (318). A servo motor (319) is fixedly installed on one inner wall of the protective box (318). The outer surface of the main shaft of the servo motor (319) is fixedly sleeved with a driving gear (320) meshing and driving with the toothed ring (34).

5. The replacement method of a ball valve that is convenient to replace according to claim 4, and the replacement method is as follows: Step 1. When the ball valve needs to be replaced, the staff energizes the servo motor (319) to make the servo motor (319) drive the driving gear (320) to rotate. When the driving gear (320) rotates, it drives the toothed ring (34) engaged with it to rotate. Since during the rotation of the toothed ring (34), the cooperation of the guide post (316) and the insertion slot (33) and the cooperation of the guide block (317) and the guide groove (35) cause the intercepting blades (36) to generate transmission, controlling the six intercepting blades (36) to simultaneously contract towards the middle of the connecting main pipe (2). At the same time, the cooperation of the docking block (37) and the docking slot (38) and the sealing sleeve (39) outside the docking block (37) seal between each adjacent intercepting blade (36) to prevent water from overflowing from the adjacent sides of the intercepting blades (36); Step 2. After the intercepting device blocks the connecting main pipe (2), the water pressure at one end of the connecting main pipe (2) will completely act on the intercepting blades (36). The water pressure squeezes the buffer plate (314) to make the buffer plate (314) push the T-shaped support rod (312) to buffer the water pressure. The stepped cavity (310) is waterproofed through the sealing layer (315) to prevent water from entering the stepped cavity (310), thereby quickly completing the blocking of the water in the connecting main pipe (2). Step 3: The worker rotates the drive ring (49). The rotation of the drive ring (49) drives the six meshing gears (48) meshing with the drive ring (49) to rotate, thereby driving the connecting screw (46) to rotate. Since the connecting screw (46) is movably installed on the inner wall of the mounting hole (45), the connecting screw (46) will not displace during rotation. The end of the connecting screw (46) is disconnected from the threaded port (43), and then the valve body (1) can be removed. Step 4: Insert the arc-shaped plate (42) of the replaced valve body (1) into the mating groove (44) of the first connection plate (4) through the second connection plate (41), and dock the connecting screw (46) with the threaded port (43). Rotate the drive ring (49). The rotation of the drive ring (49) drives the six meshing gears (48) meshing with the drive ring (49) to rotate, thereby driving the connecting screw (46) to rotate. Since the connecting screw (46) is movably installed on the inner wall of the mounting hole (45), the connecting screw (46) will not displace during rotation, so that the end of the connecting screw (46) is threadedly connected to the threaded port (43), and the seal plug ring (410) and the connection card slot (411) are matched to seal between the first connection plate (4) and the second connection plate (41), thus completing the replacement of the valve body (1). Subsequently, control the throttling device to cancel the blockage of the connecting main pipe (2).

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