Large-diameter stop valve

Abstract

The invention discloses a large-diameter stop valve, which belongs to the field of pipeline valves and mainly comprises a valve body, an upper cover, a fixing mechanism, a locking mechanism, a transmission mechanism and a valve plate, the valve plate can be matched with a valve port, and the valve plate can be switched between a closed state and an open state; the fixing mechanism is used for fixing the valve plate and can be switched between a fixed state and a loosened state; the transmission mechanism is used for driving the valve plate and the fixing mechanism to switch states, the transmission mechanism can be switched between an opening state and a closing state, and when the transmission mechanism is in the opening state, the fixing mechanism is switched to the loosening state, and the valve plate is switched to the opening state; when the transmission mechanism is in the combined state, the valve plate is switched to the closed state, and the fixing mechanism is switched to the fixed state; according to the valve plate, valve erosion is avoided, and the service life is prolonged; the valve plate is matched with the fixing head and the valve body, so that the stress of the valve plate is balanced, and the valve plate can bear large pressure; and meanwhile, the quick-opening and quick-closing functions can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a large-diameter stop valve. Background Art

[0002] The stop valve, also known as the gate valve, is a forced sealing valve and one of the most widely used valves. The friction between the sealing surfaces of the stop valve is small during opening and closing, it is relatively durable, and the opening height is not large. It is easy to manufacture and is suitable not only for medium and low pressures, but also for high pressures. At present, the stop valve is widely used in the fields of petroleum, petrochemical, chemical, metallurgy, electricity, fire protection, machinery, etc. Large-diameter stop valve is a type of stop valve. The existing large-diameter stop valve still has the following problems during use:

[0003] 1. The valve core sealing surface of the existing large-diameter stop valve is generally facing the valve port. When the large-diameter stop valve is in use, the flow of the medium in the valve will flush the valve core sealing surface. After repeated use, the valve core sealing surface will be eroded, thereby reducing the service life of the large-diameter stop valve;

[0004] 2. The existing large-diameter stop valve is generally opened and closed by rotating the valve stem. However, since the valve stem is generally raised and lowered by threaded fitting, it needs to be rotated many times during the opening and closing process, which consumes a lot of time and manpower, and cannot be opened and closed quickly.

[0005] 3. When the existing large-diameter stop valve is closed, the medium exerts a greater pressure on the valve core due to the larger diameter of the valve port. Since the valve core is positioned by the valve stem, the valve stem is generally matched by threads. When the valve stem is subjected to greater pressure, the valve stem threads are easily damaged, causing the valve stem to fail. Summary of the invention

[0006] Based on this, it is necessary to provide a large-diameter stop valve to solve the above problems.

[0007] On the one hand, the present application provides a large-diameter stop valve, comprising: a valve body and an upper cover, wherein a valve cavity is provided in the valve body, an inlet A is provided below the valve body, an outlet B is provided on the left side of the valve body, a valve port is provided between the valve cavity and the inlet A, and the upper cover is fixedly arranged above the valve body to block the valve cavity; this embodiment also includes: a fixing mechanism, a locking mechanism, a transmission mechanism and a valve plate; the valve plate is rotatably arranged in the valve cavity, the valve plate can cooperate with the valve port, and the valve plate can switch between a closed state and an open state; the fixing mechanism is arranged on the left side of the valve body to fix the valve plate, and the fixing mechanism can switch between a fixed state and a loose state; the transmission mechanism is arranged on the right side of the valve cavity to drive the valve plate and the fixing mechanism to switch states, and the transmission mechanism can switch between an open state and a merged state, when the transmission mechanism is in the open state, the fixing mechanism switches to a loose state, and the valve plate switches to an open state; when the transmission mechanism is in a merged state, the valve plate switches to a closed state, and the fixing mechanism switches to a fixed state.

[0008] According to a favorable embodiment, the transmission mechanism includes: a transmission frame, a control plate, and a connecting rod assembly; one side of the transmission frame is rotatably arranged on the right side above the valve body, and the other side is provided with a transmission frame rod along the front-to-back direction, and a locking rod is provided in the middle of the transmission frame along the front-to-back direction, and the transmission frame can switch between a vertical position and a horizontal position; the control plate is rotatably arranged in the valve cavity, the control plate and the transmission frame are fixedly connected, and a first arc groove and a second arc groove are provided on the control plate, and the first arc groove and the second arc groove are connected to each other; the connecting rod assembly is arranged on the right side in the valve cavity to cooperate with the control plate.

[0009] According to a preferred embodiment, the connecting rod assembly includes: a transmission track, a first slider, a second slider, a rotating block, a first connecting rod, a second connecting rod and a third connecting rod; the transmission track is fixedly arranged in the valve cavity along the vertical direction; the first slider is slidably arranged on the upper side of the transmission track, and a slider pin is provided on the rear side of the first slider, and the slider pin is slidably matched with the first arc groove and the second arc groove; the second slider is slidably arranged on the lower side of the transmission track; the middle part of the first connecting rod is rotatably matched with the middle part of the transmission track; one end of the second connecting rod is hinged to one end of the first connecting rod, and the other end is hinged to the first slider; one end of the third connecting rod is hinged to the other end of the first connecting rod, and the other end is hinged to the second slider; the rotating block is rotatably arranged on the lower side of the second slider.

[0010] According to an advantageous embodiment, a valve plate slide bar is fixedly provided on the outer circumferential wall of the valve plate, and the valve plate slide bar is slidably arranged on the rotating block.

[0011] According to a favorable embodiment, the fixing mechanism includes: a fixing frame, a fixing cross bar and a fixing spring; the fixing frame is rotatably arranged on the left side of the valve body, a plurality of pushing balls are arranged on the upper side of the fixing frame, the transmission frame rod cooperates with the pushing balls, and a pushing angle is arranged on the lower side of the fixing frame; the right end of the fixing cross bar penetrates into the valve cavity in a horizontal direction, a fixing head is arranged on the right end of the fixing cross bar, and the left end is pressed against the pushing angle; the fixing spring is sleeved on the fixing cross bar to push the fixing cross bar to move in the direction of exiting the valve cavity.

[0012] According to a preferred embodiment, the locking mechanism includes: a locking pin, a locking plate, a locking seat and a locking spring; the locking seat is fixedly arranged on the upper side of the cover plate; the locking pin is slidably arranged on the locking seat, and a locking pin inclined surface is provided on the right side of the locking pin, and the locking rod and the locking pin inclined surface cooperate; the locking plate is fixedly arranged on the right side of the locking pin to limit the locking pin; the locking spring is sleeved on the locking pin to drive the locking pin to move away from the locking seat.

[0013] According to an advantageous embodiment, a positioning groove is further provided on the valve body.

[0014] According to an advantageous embodiment, a countersunk hole is further provided on the transmission frame, a steel ball and a positioning spring are provided in the countersunk hole, and the positioning spring drives the steel ball to move in a direction away from the countersunk hole.

[0015] According to an advantageous embodiment, when the steel ball is located in the positioning groove, the transmission frame is in a vertical position.

[0016] According to an advantageous embodiment, when the transmission frame is in a vertical position, the transmission mechanism is in an open state, and when the transmission frame is in a horizontal position, the transmission mechanism is in a combined state.

[0017] In summary, the present invention includes at least one of the following beneficial effects:

[0018] 1. By rotatably providing a valve plate in the valve body, when the present invention is opened, since the sealing surface of the valve plate is not directly opposite to the valve port, the medium passing through the valve port cannot be directly washed on the sealing surface of the valve plate, thereby preventing the valve plate from being eroded, thereby extending the service life of the present invention;

[0019] 2. By setting the transmission mechanism and the valve plate, during the opening and closing process of the present invention, the transmission mechanism can be controlled by flipping the transmission frame to drive the valve plate to flip, so as to realize the opening and closing of the present invention, so that the present invention does not need to use a valve stem with a thread, and does not need to spend a lot of time rotating the valve stem, so that the present invention can realize the function of fast opening and closing;

[0020] 3. By setting up the fixing mechanism and the transmission mechanism to cooperate, under the action of the transmission mechanism, when the valve plate is in a closed state, the fixing mechanism is in a fixed state. At this time, one end of the valve plate is pressed by the fixing head, and the other end is rotated to fit on the valve body, so that the valve plate is balanced in force and can withstand greater pressure. This makes it unnecessary to use a valve stem with a thread in the present invention, avoiding the failure of the thread due to excessive pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional view of the present invention;

[0022] Figure 2 A three-dimensional view of the interior of the present invention when it is closed;

[0023] Figure 3 The three-dimensional internal view of the fixed head of the present invention when it is separated from the valve plate;

[0024] Figure 4 This is a three-dimensional view of the interior of the present invention when it is turned on;

[0025] Figure 5 A three-dimensional view of the transmission mechanism of the present invention when closed;

[0026] Figure 6 A three-dimensional view of the transmission mechanism of the present invention when it is turned on;

[0027] Figure 7 A three-dimensional view of the locking mechanism of the present invention;

[0028] Figure 8 A three-dimensional view of the control panel of the present invention;

[0029] Fig. 9 A three-dimensional view of the transmission mechanism and the valve plate of the present invention when they are matched;

[0030] Fig.10 A three-dimensional view of the valve body of the present invention;

[0031] Fig.11 A three-dimensional view of the transmission frame of the present invention;

[0032] Fig.12 It is a three-dimensional view of the fixing frame of the present invention. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0034] like Figure 1-Figure 12 As shown, a large-caliber stop valve comprises: a valve body 11 and an upper cover 12, a valve cavity is arranged in the valve body 11, an inlet A is arranged below the valve body 11, an outlet B is arranged on the left side of the valve body 11, a valve port is arranged between the valve cavity and the inlet A, and the upper cover 12 is fixedly arranged above the valve body 11 to block the valve cavity; this embodiment also comprises: a fixing mechanism 2, a locking mechanism 3, a transmission mechanism 4 and a valve plate 5; the valve plate 5 is rotatably arranged in the valve cavity, the valve plate 5 cooperates with the valve port, and the valve plate 5 can switch between a closed state and an open state; the fixing mechanism 2 is arranged on the left side of the valve body 11 to fix the valve plate 5, and the fixing mechanism 2 can switch between a fixed state and a loose state; the transmission mechanism 4 is arranged on the right side of the valve cavity to drive the valve plate 5 and the fixing mechanism 2 to switch states, and the transmission mechanism 4 can switch between an open state and a merged state. When the transmission mechanism 4 is in the open state, the fixing mechanism 2 switches to a loose state, and the valve plate 5 switches to an open state; when the transmission mechanism 4 is in a merged state, the valve plate 5 switches to a closed state, and the fixing mechanism 2 switches to a fixed state.

[0035] like Figure 2-Figure 6 , Figure 8 , Fig. 9 , Fig.11 As shown, the transmission mechanism 4 includes: a transmission frame 41, a control plate 42, and a connecting rod assembly; one side of the transmission frame 41 is rotatably set on the right side above the valve body 11, and the other side is provided with a transmission frame rod 411 along the front-to-back direction, and the middle part of the transmission frame 41 is provided with a locking rod 412 along the front-to-back direction, and the transmission frame 41 can switch between a vertical position and a horizontal position; the control plate 42 is rotatably set in the valve cavity, the control plate 42 and the transmission frame 41 are fixedly connected, and a first arc groove 421 and a second arc groove 422 are provided on the control plate 42, and the first arc groove 421 and the second arc groove 422 are connected to each other; the connecting rod assembly is set on the right side of the valve cavity to cooperate with the control plate 42.

[0036] In specific operation, by setting the transmission mechanism 4 and the valve plate 5, during the opening and closing process of the present invention, the transmission mechanism 4 can be controlled by flipping the transmission frame 41 to drive the valve plate 5 to flip, thereby realizing the opening and closing of the present invention. The present invention does not need to use a valve stem with a thread, and does not need to spend a lot of time rotating the valve stem, so that the present invention can realize the function of fast opening and closing.

[0037] like Figure 2-Figure 6 , Fig. 9As shown, the connecting rod assembly includes: a transmission track 43, a first slider 441, a second slider 442, a rotating block 45, a first connecting rod 461, a second connecting rod 462 and a third connecting rod 463; the transmission track 43 is fixedly arranged in the valve cavity along the vertical direction; the first slider 441 is slidably arranged on the upper side of the transmission track 43, and a slider pin 4411 is provided on the rear side of the first slider 441, and the slider pin 4411 is slidably matched with the first arc groove 421 and the second arc groove 422; the second slider 442 is slidably arranged on the lower side of the transmission track 43; the middle part of the first connecting rod 461 is rotatably matched with the middle part of the transmission track 43; one end of the second connecting rod 462 is hinged to one end of the first connecting rod 461, and the other end is hinged to the first slider 441; one end of the third connecting rod 463 is hinged to the other end of the first connecting rod 461, and the other end is hinged to the second slider 442; the rotating block 45 is rotatably arranged on the lower side of the second slider 442.

[0038] like Figure 2-Figure 4 , Fig. 9 As shown, a valve plate slide bar 51 is fixedly provided on the outer circumferential wall of the valve plate 5 , and the valve plate slide bar 51 is slidably disposed on the rotating block 45 .

[0039] During specific operation, the valve plate 5 is rotated in the valve body 11. When the present invention is opened, since the sealing surface of the valve plate 5 is not directly opposite to the valve port, the medium passing through the valve port cannot directly flush the sealing surface of the valve plate 5, thereby preventing the valve plate 5 from being eroded, thereby extending the service life of the present invention.

[0040] like Figure 1-Figure 4 , Fig.12 As shown, the fixing mechanism 2 includes: a fixing frame 21, a fixing cross bar 22 and a fixing spring 23; the fixing frame 21 is rotatably arranged on the left side of the valve body 11, a plurality of pushing balls 211 are arranged on the upper side of the fixing frame 21, a transmission frame rod 411 cooperates with the pushing balls 211, and a pushing angle 212 is arranged on the lower side of the fixing frame 21; the right end of the fixing cross bar 22 penetrates into the valve cavity in the horizontal direction, a fixing head 221 is arranged on the right end of the fixing cross bar 22, and the left end is pressed on the pushing angle 212; the fixing spring 23 is sleeved on the fixing cross bar 22 to push the fixing cross bar 22 to move in the direction of exiting the valve cavity.

[0041] During specific operation, by setting the fixing mechanism 2 and the transmission mechanism 4 to cooperate, under the action of the transmission mechanism 4, when the valve plate 5 is in a closed state, the fixing mechanism 2 is in a fixed state. At this time, one end of the valve plate 5 is pressed by the fixing head 221, and the other end is rotated to cooperate with the valve body 11, so that the valve plate 5 is force balanced and can withstand greater pressure, so that the present invention does not need to use a valve stem with a thread, avoiding the failure problem of the thread due to excessive pressure.

[0042] like Figure 1-Figure 4 , Figure 7As shown, the locking mechanism 3 includes: a locking pin 31, a locking plate 32, a locking seat 33 and a locking spring 34; the locking seat 33 is fixedly arranged on the upper side of the cover plate 12; the locking pin 31 is slidably arranged on the locking seat 33, and a locking pin inclined surface 311 is provided on the right side of the locking pin 31, and the locking rod 412 cooperates with the locking pin inclined surface 311; the locking plate 32 is fixedly arranged on the right side of the locking pin 31 to limit the locking pin 31; the locking spring 34 is sleeved on the locking pin 31 to drive the locking pin 31 to move away from the locking seat 33.

[0043] like Fig.10 As shown, a positioning groove 111 is further provided on the valve body 11 .

[0044] like Fig.11 As shown, the transmission frame 41 is further provided with a countersunk hole, in which a steel ball 61 and a positioning spring 62 are arranged, and the positioning spring 62 drives the steel ball 61 to move away from the countersunk hole.

[0045] like Fig.10 , Fig.11 As shown, when the steel ball 61 is located in the positioning groove 111, the transmission frame 41 is in a vertical position.

[0046] like Figure 1-Figure 4 As shown, when the transmission frame 41 is in a vertical position, the transmission mechanism 4 is in an open state, and when the transmission frame 41 is in a horizontal position, the transmission mechanism 4 is in a combined state.

[0047] The working principle of this large diameter stop valve is as follows:

[0048] like Figure 2 The figure shows the internal structure of the present invention when it is closed. At this time, the fixing mechanism 2 is in a fixed state, the valve plate 5 is in a closed state, the transmission mechanism 4 is in a merged state, and the transmission frame 41 is in a horizontal position. When the present invention needs to be opened, the locking spring 34 is first overcome to pull the lock pin 31 so that the lock pin 31 is away from the locking rod 412, and the transmission frame 41 is unlocked. Then, the transmission frame 41 is flipped upward. Since the transmission frame 41 and the control plate 42 are coaxial and fixedly connected, the control plate 42 is driven to rotate, so that the slider pin 4411 slides along the second arc groove 422. Since the axis of the second arc groove 422 The first slider 441 is coaxial with the rotating shaft of the control plate 42, so that the slider pin 4411 drives the first slider 441 to remain stationary, thereby preventing the connecting rod assembly from being driven, so that the valve plate 5 remains in a closed state. At the same time, due to the overturning of the transmission frame 41, the transmission frame rod 411 is away from the pushing ball 211, and the fixed cross bar 22 is pushed to move under the action of the fixing spring 23, and the transmission fixing frame 21 rotates, and at the same time, the fixing head 221 moves. When the slider pin 4411 moves to the intersection of the first arc groove 421 and the second arc groove 422, the fixing head 221 is separated from the valve plate 5, so that the valve plate 5 is unlocked (such as Figure 3As shown), the fixing mechanism 2 switches to the loose state at this time; as the transmission frame 41 drives the control plate 42 to rotate, so that the slider pin 4411 enters the first arc groove 421, the first arc groove 421 and the slider pin 4411 cooperate to drive the first slider 441 to slide upward along the transmission track 43. Since one end of the second connecting rod 462 is hinged to the first slider 441, and the other end is hinged to one end of the first connecting rod 461, one end of the third connecting rod 463 is hinged to the second slider 442, and the other end is hinged to the other end of the first connecting rod 461, the middle part of the first connecting rod 461 rotates and cooperates with the transmission track 43, thereby driving the second slider 442 to move downward along the transmission track 43. Since the valve plate 5 is rotatably arranged in the valve cavity, the rotating block 45 is arranged on the second slider 4 At the lower side of 42, the valve plate slide rod 51 and the rotating block 45 slide and cooperate, thereby driving the valve plate 5 to flip upward. When the transmission frame 41 flips to the vertical position, the steel ball 61 is pushed into the positioning groove 111 for positioning under the action of the positioning spring 62. At this time, the connecting rod assembly drives the valve plate 5 to stand upright, opens the valve port, and the valve plate 5 is switched to the open state. The transmission mechanism 4 is in the flipped state, and the present invention completes the opening. Since the opening of the valve plate 5 of the present invention is completed by flipping the transmission frame 41, the valve plate 5 can be opened quickly, and since the medium enters the valve cavity through the inlet A after the valve plate 5 flips, and then is discharged through the outlet B, at this time, the sealing surface of the valve plate 5 is set on the right side of the valve port, and the medium passing through the valve port will not directly hit the sealing surface of the valve plate 5, thereby avoiding erosion and extending the service life of the present invention;

[0049] When the present invention needs to be closed, the transmission frame 41 is first reversed to overcome the positioning spring 62, so that the steel ball 61 exits the positioning groove 111, and the transmission frame 41 drives the control plate 42 to rotate, so that the slider pin 4411 slides along the first arc groove 421, and then drives the first slider 441 to slide downward along the transmission track 43, and drives the second slider 442 to slide upward through the first connecting rod 461, the second connecting rod 462 and the third connecting rod 463. Since the rotating block 45 is rotatably arranged on the second slider 442, the rotating block 45 and the valve The plate slide rod 51 slides and cooperates, thereby driving the valve plate 5 to reverse. When the slider pin 4411 comes to the intersection of the first arc groove 421 and the second arc groove 422, the valve plate 5 turns over to block the valve port, and the valve plate 5 switches to the closed state. At this time, the transmission frame rod 411 and the push ball 211 are in contact; as the transmission frame 41 continues to reverse, the slider pin 4411 enters the second arc groove 422 and slides, so that the first slider 441 is positioned and immovable, the valve plate 5 remains in the closed state, and the transmission frame rod 411 swings downward, driving The push ball 211 drives the fixed frame 21 to rotate, so that the push angle 212 drives the fixed cross bar 22 to overcome the fixed spring 23 to move, and drives the fixed head 221 to move horizontally to the top of the valve plate 5. When the transmission frame 41 is reversed to the horizontal position, the fixed head 221 is completely above the valve plate 5, and the fixing mechanism 2 is switched to the fixed state. At the same time, during the reversal of the transmission frame 41, the locking rod 412 contacts the locking pin inclined surface 311. Through the cooperation of the locking rod 412 and the locking pin inclined surface 311, the locking pin 31 overcomes the locking pin 31. The locking spring 34 moves, and when the transmission frame 41 reverses to the horizontal position, the locking rod 412 just passes over the locking pin 31, and under the action of the locking spring 34, the locking pin 31 is pushed against the locking plate 32, and the transmission frame 41 is positioned in the horizontal position. The transmission mechanism 4 is in a combined state, and the closing of the present invention is completed. When the present invention is closed, one end of the valve plate 5 is pressed by the fixed head 221, and the other end is rotated to fit on the valve body 11, so that the valve plate 5 is balanced in force and can withstand greater pressure, thereby avoiding the failure problem of the present invention due to excessive pressure.

[0050] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A large-diameter stop valve, comprising: A valve body (11) and an upper cover (12), wherein a valve cavity is provided in the valve body (11), an inlet A is provided below the valve body (11), an outlet B is provided on the left side of the valve body (11), a valve port is provided between the valve cavity and the inlet A, and the upper cover (12) is fixedly arranged above the valve body (11) to block the valve cavity; characterized in that it also includes: a fixing mechanism (2), a locking mechanism (3), a transmission mechanism (4) and a valve plate (5); The valve plate (5) is rotatably arranged in the valve cavity, the valve plate (5) cooperates with the valve port, and the valve plate (5) can be switched between a closed state and an open state; The fixing mechanism (2) is arranged on the left side of the valve body (11) and is used to fix the valve plate (5); the fixing mechanism (2) can be switched between a fixed state and a loosened state; The transmission mechanism (4) is arranged on the right side of the valve cavity, and is used to drive the valve plate (5) and the fixing mechanism (2) to switch states. The transmission mechanism (4) can switch between an open state and a combined state. When the transmission mechanism (4) is in the open state, the fixing mechanism (2) switches to a loose state, and the valve plate (5) switches to an open state; when the transmission mechanism (4) is in the combined state, the valve plate (5) switches to a closed state, and the fixing mechanism (2) switches to a fixed state.

2. A large-diameter stop valve according to claim 1, characterized in that: The transmission mechanism (4) comprises: a transmission frame (41), a control panel (42), and a connecting rod assembly; One side of the transmission frame (41) is rotatably arranged on the right side above the valve body (11), and the other side is provided with a transmission frame rod (411) along the front-back direction, and a locking rod (412) is provided in the middle of the transmission frame (41) along the front-back direction, and the transmission frame (41) can be switched between a vertical position and a horizontal position; The control plate (42) is rotatably disposed in the valve cavity, the control plate (42) and the transmission frame (41) are fixedly connected, the control plate (42) is provided with a first arc groove (421) and a second arc groove (422), and the first arc groove (421) and the second arc groove (422) are communicated with each other; The connecting rod assembly is arranged on the right side of the valve cavity to cooperate with the control plate (42).

3. A large-diameter stop valve according to claim 2, characterized in that: The connecting rod assembly comprises: a transmission track (43), a first slider (441), a second slider (442), a rotating block (45), a first connecting rod (461), a second connecting rod (462) and a third connecting rod (463); The transmission track (43) is fixedly arranged in the valve cavity along the vertical direction; The first slider (441) is slidably arranged on the upper side of the transmission track (43), a slider pin (4411) is arranged on the rear side of the first slider (441), and the slider pin (4411) is slidably matched with the first arc groove (421) and the second arc groove (422); The second sliding block (442) is slidably disposed on the lower side of the transmission track (43); The middle portion of the first connecting rod (461) and the middle portion of the transmission track (43) are rotatably matched; One end of the second connecting rod (462) is hinged to one end of the first connecting rod (461), and the other end is hinged to the first sliding block (441); One end of the third connecting rod (463) is hinged to the other end of the first connecting rod (461), and the other end is hinged to the second sliding block (442); The rotating block (45) is rotatably disposed on the lower side of the second sliding block (442).

4. A large-diameter stop valve according to claim 1, characterized in that: A valve plate slide bar (51) is fixedly provided on the outer circumferential wall of the valve plate (5), and the valve plate slide bar (51) is slidably arranged on the rotating block (45).

5. A large-diameter stop valve according to claim 1, characterized in that: The fixing mechanism (2) comprises: a fixing frame (21), a fixing cross bar (22) and a fixing spring (23); The fixing frame (21) is rotatably arranged on the left side of the valve body (11), a plurality of pushing balls (211) are arranged on the upper side of the fixing frame (21), the transmission frame rod (411) cooperates with the pushing balls (211), and a pushing angle (212) is arranged on the lower side of the fixing frame (21); The right end of the fixed cross bar (22) penetrates into the valve cavity in the horizontal direction, the right end of the fixed cross bar (22) is provided with a fixed head (221), and the left end is pressed against the push angle (212); The fixing spring (23) is sleeved on the fixing cross bar (22) to push the fixing cross bar (22) to move in a direction of exiting the valve cavity.

6. A large-diameter stop valve according to claim 1, characterized in that: The locking mechanism (3) comprises: a locking pin (31), a locking plate (32), a locking seat (33) and a locking spring (34); The locking seat (33) is fixedly arranged on the upper side of the cover plate (12); The locking pin (31) is slidably arranged on the locking seat (33), a locking pin inclined surface (311) is arranged on the right side of the locking pin (31), and the locking rod (412) cooperates with the locking pin inclined surface (311); The locking plate (32) is fixedly arranged on the right side of the locking pin (31) to limit the locking pin (31); The locking spring (34) is sleeved on the locking pin (31) to drive the locking pin (31) to move in a direction away from the locking seat (33).

7. A large-diameter stop valve according to claim 1, characterized in that: The valve body (11) is also provided with a positioning groove (111).

8. A large-diameter stop valve according to claim 2, characterized in that: The transmission frame (41) is also provided with a countersink, in which a steel ball (61) and a positioning spring (62) are arranged, and the positioning spring (62) drives the steel ball (61) to move in a direction away from the countersink.

9. A large-diameter stop valve according to claim 8, characterized in that: When the steel ball (61) is located in the positioning groove (111), the transmission frame (41) is in a vertical position.

10. A large-diameter stop valve according to claim 9, characterized in that: When the transmission frame (41) is in a vertical position, the transmission mechanism (4) is in an open state; when the transmission frame (41) is in a horizontal position, the transmission mechanism (4) is in a combined state.

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