Wellhead safety cut-off flat valve

Abstract

The invention discloses a wellhead safety cut-off flat valve which comprises a valve box, conveying pipelines are fixedly installed at the two ends of the valve box, a box cover is arranged at the top end of the valve box, a liquid storage box is fixedly installed on the inner wall of the bottom end of the valve box, and a main plate and two auxiliary plates are slidably connected to the inner side wall of the liquid storage box. A main rotating rod is arranged to drive a main gear to rotate on an ejector rod, and the main rotating rod can sequentially act on a secondary screw rod and an auxiliary screw rod, so that two secondary plates can firstly slide downwards to cut off water flow in a valve box, and meanwhile, the auxiliary screw rod acts on an auxiliary plate to cut off water flow in the valve box; when the secondary plate slides downwards by half, the secondary plate can be started to slide downwards to perform double cut-off so as to achieve a better protection effect, cut-off failure caused by damage of the secondary plate is prevented, at the moment, through downward sliding of the main plate, the whole flat valve can perform a triple cut-off effect, the protection effect on the main plate in the middle position is further achieved, and the service life of the flat valve is prolonged. And the service life and the performance of the whole flat valve are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flat valves, and particularly to a wellhead safety cut-off flat valve. Background Technique

[0002] A flat valve is a sliding valve with a parallel gate as the closing member, and the traditional cut-off flat valve still has the following defects:

[0003] During the use of the traditional flat valve, due to the large impact of water flow, and there is only one flat plate inside the flat valve to cut off the water flow, the impact force of the water flow on a single flat plate is large. And while the flat plate moves downward, there may be sediment and other accumulations remaining on the inner wall at the bottom of the valve. Directly moving the flat plate downward may be affected by the sediment, resulting in poor cut-off effect, and the sediment may also cause wear to the flat plate. The traditional flat valve cannot effectively remove the sediment while improving the service life of the flat plate, thus reducing the overall use effect and service life of the flat valve. Summary of the Invention

[0004] The purpose of the present invention is to provide a wellhead safety cut-off flat valve to solve the problem in the above background technique that the traditional flat valve cannot effectively remove sediment while improving the service life of the flat plate, thus reducing the overall use effect and service life of the flat valve.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A wellhead safety cut-off flat valve, including a valve box, both ends of the valve box are fixedly installed with conveying pipelines, the top end of the valve box is provided with a box cover, the inner wall of the bottom end of the valve box is fixedly installed with a liquid storage tank, the inner side walls of the liquid storage tank are respectively slidably connected with a main plate and two sub-plates, the inner side walls of the valve box are also slidably connected with two secondary plates, the inner wall ends of the main plate, sub-plates and secondary plates are respectively threadedly connected with a main screw, sub-screws and secondary screws, a driving component is arranged on the inner side wall of the valve box, two communicating pipes are fixedly installed on the inner side wall of the main plate, the inner side walls of the two communicating pipes are rotatably connected with an internal gear ring, a flow guiding rotating rod is fixedly installed on the inner side wall of the internal gear ring, a flow guiding component is arranged on the inner side wall of the main plate, a filter screen is fixedly installed on the inner side wall of the sub-plate, an opening and closing plate is also rotatably connected to the inner side wall of the sub-plate, one-way valve pipes are fixedly installed at both ends of the communicating pipes, both sides of the bottom end of the liquid storage tank and both ends of the sub-plate.

[0006] To enable the main board to slide downward, as a preferred embodiment of the present invention, the driving assembly includes a bottom rod rotatably connected to the inner wall of the valve box. The outer side of the bottom rod is rotatably connected to the top inner wall of the liquid storage tank. A bottom gear is fixedly installed on the outer side of the top of the bottom rod. A top rod is arranged at the top of the bottom rod. The bottom end of the top rod is fixedly connected to the inner wall of the valve box. A main rotating rod is rotatably connected to the inner wall of the valve box. The inner wall of the main rotating rod is rotatably connected to the inner wall of the top rod. A main gear is fixedly installed at the bottom end of the main rotating rod. The main gear is threadedly connected to the outer side of the top of the top rod. Two linkage gears are rotatably connected to the inner wall of the valve box. The outer sides of the main gear and the bottom gear are engaged with the linkage gears.

[0007] To enable the secondary board, auxiliary board, and main board to slide in sequence, as a preferred embodiment of the present invention, the driving assembly further includes four driving rods rotatably connected to the inner wall of the valve box. The top ends of the four driving rods are rotatably connected to the bottom end of the box cover. Driven gears are fixedly installed on the outer sides of the driving rods. The driven gears are engaged with the main gear. Two first transition gears are also rotatably connected to the inner wall of the valve box. A secondary gear and a sub-gear are respectively fixedly installed at the top ends of one of the auxiliary screw rod and the sub-screw rod. The first transition gears are respectively engaged with the secondary gear and the driven gear. Two transition rods are also rotatably connected to the inner wall of the valve box. A second transition gear is fixedly installed at the top end of one of the transition rods. The second transition gear is engaged with the sub-gear.

[0008] To enable the secondary board, auxiliary board, and main board to slide separately, as a preferred embodiment of the present invention, the driving assembly further includes first pulleys fixedly installed on the outer sides of the top of the bottom rod and the main screw rod. A main transmission belt is sleeved on the outer side of the first pulley. Second pulleys are fixedly installed at the bottom end of one of the driving rods, the bottom end of the transition rod, the outer side of the top of the auxiliary screw rod, and the outer side of the top of the sub-screw rod. A secondary transmission belt, a sub-transmission belt, a first transmission belt, and a second transmission belt are respectively sleeved on the outer sides of the second pulleys.

[0009] To enable the main rotating shaft to rotate while the main board slides, as a preferred embodiment of the present invention, the flow guiding assembly includes a main rotating shaft rotatably connected to the inner wall of the main board. The inner wall of the main rotating shaft is slidably connected to the outer side of the bottom rod. A first gear is fixedly installed on the outer side of the main rotating shaft.

[0010] To enable the water to flow downward while the main board slides, as a preferred embodiment of the present invention, the flow guiding assembly further includes second gears rotatably connected to the inner walls on both sides of the main board. The outer sides of the second gears are respectively engaged with the internal gear ring and the first gear.

[0011] In order to enable the auxiliary plate to be taken out or installed from inside the valve box, as a preferred embodiment of the present invention, two limit posts are fixedly installed at the bottom end of the box cover, and the outer sides of the bottom ends of the two limit posts are slidably connected to the inner wall of the top end of the valve box. The inner wall of the top end of the box cover is movably connected to the outer sides of the top ends of the main rotating rod and the driving rod respectively.

[0012] In order to enable the box cover and the valve box to be installed or disassembled, as a preferred embodiment of the present invention, fixing bolts are threadedly connected around the box cover, and the bottom ends of the four fixing bolts are threadedly connected to the inner wall of the top end of the valve box.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1) By setting the main rotating rod to drive the main gear to rotate on the ejector rod, the secondary screw rod and the auxiliary screw rod can be successively actuated, so that the two secondary plates can first slide downward to cut off the water flow inside the valve box. At the same time, through the action of the auxiliary screw rod on the auxiliary plate, when the secondary plate slides downward by half, the auxiliary plate can be started to slide downward for double truncation to achieve a better protection effect, preventing the failure of truncation caused by the damage of the secondary plate. At this time, the overall flat valve can achieve a triple truncation effect by the downward sliding of the main plate, further protecting the main plate in the middle position, and improving the service life and performance of the overall flat valve;

[0015] 2) By the rotation of the flow guiding rotating rod arranged inside the main plate, when the main plate cuts off downward, the water flow between the liquid storage tank and the two auxiliary plates can be affected, exerting an impact on the lower part of the main plate, reducing the accumulation of sediment, and generating a thrust to push the sediment into the auxiliary plate. The sediment can be filtered through the filter screen inside the auxiliary plate and then precipitated and collected, improving the cleaning effect on the inside of the valve box. And the auxiliary plate can be taken out from inside the valve box, which is more convenient for removing the collected sediment and improving the use effect of the overall flat valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the present invention;

[0017] Figure 2 It is a schematic structural diagram of the inside of the valve box of the present invention;

[0018] Figure 3 It is a schematic structural diagram of the secondary plate of the present invention;

[0019] Figure 4 It is a schematic structural diagram of the driving component of the present invention;

[0020] Figure 5 It is a schematic structural diagram of the inside of the liquid storage tank of the present invention;

[0021] Figure 6 It is a schematic structural diagram of the inside of the main plate of the present invention;

[0022] Figure 7 Schematic diagram of the internal structure of the limit post of the present invention;

[0023] Figure 8 Schematic diagram of the internal structure of the auxiliary plate of the present invention.

[0024] In the figure: 1. Valve box; 101. Delivery pipeline; 102. Box cover; 103. Limit post; 104. Fixed bolt; 2. Liquid storage tank; 3. Main board; 31. Main screw; 32. Connecting pipe; 33. Internal gear ring; 34. Flow guiding rotating rod; 4. Auxiliary board; 41. Auxiliary screw; 42. Filter screen; 43. Opening and closing plate; 44. Auxiliary gear; 5. Secondary board; 51. Secondary screw; 52. Secondary gear; 6. Driving assembly; 61. Bottom rod; 611. Bottom gear; 62. Top rod; 63. Main rotating rod; 631. Main gear; 632. Linking gear; 64. Driving rod; 641. Driven gear; 65. First intermediate gear; 66. Transition rod; 661. Second intermediate gear; 67. First pulley; 671. Main transmission belt; 68. Second pulley; 681. Auxiliary transmission belt; 682. Secondary transmission belt; 683. First transmission belt; 684. Second transmission belt; 7. Flow guiding assembly; 71. Main rotating shaft; 72. First gear; 73. Second gear; 8. Check valve pipe. Specific embodiments

[0025] 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figure 1-8 , the present invention provides a technical solution:

[0027] A wellhead safety cut-off flat valve, comprising a valve box 1, conveying pipelines 101 are fixedly installed at both ends of the valve box 1, a box cover 102 is arranged at the top end of the valve box 1, a liquid storage tank 2 is fixedly installed on the inner wall of the bottom end of the valve box 1, a main board 3 and two sub-boards 4 are respectively slidably connected to the inner side wall of the liquid storage tank 2, two secondary boards 5 are also slidably connected to the inner side wall of the valve box 1, main screws 31, sub-screws 41 and secondary screws 51 are respectively threadedly connected to the inner wall at both ends of the main board 3, the sub-board 4 and the secondary board 5, a driving assembly 6 is arranged on the inner side wall of the valve box 1, two communicating pipes 32 are fixedly installed on the inner side wall of the main board 3, an internal gear ring 33 is rotatably connected to the inner side wall of the two communicating pipes 32, a flow guiding rotating rod 34 is fixedly installed on the inner side wall of the internal gear ring 33, a flow guiding assembly 7 is arranged on the inner side wall of the main board 3, a filter screen 42 is fixedly installed on the inner side wall of the sub-board 4, an opening and closing plate 43 is also rotatably connected to the inner side wall of the sub-board 4, one-way valve pipes 8 are fixedly installed at both ends of the communicating pipes 32, both sides of the bottom end of the liquid storage tank 2 and both ends of the sub-board 4.

[0028] During specific use, after the integral flat valve is installed through the conveying pipeline 101, the main board 3, the secondary board 4 and the tertiary board 5 all move upward to the highest position, so that it can be used for the passage of water flow. When it is necessary to cut off the water flow, first, the tertiary screw rod 51 is driven to rotate by the driving component 6, so that the two tertiary boards 5 slide downward to conduct a preliminary cut-off of the valve box 1. When the tertiary board 5 slides downward by half, the driving component 6 can be used again to drive the secondary screw rod 41, so that the two secondary boards 4 slide downward, so that the tertiary board 5 and the secondary board 4 play a dual-insurance role in the water flow passage part of the valve box 1. By continuously using the driving component 6 to act on the main screw rod 31, the main board 3 can slide downward from the inside of the liquid storage tank 2, so as to play a triple-insurance role for the valve box 1, prevent the failure of the cut-off caused by the damage of the tertiary board 5 or the secondary board 4, and can extend the service life of the main board 3. During the downward sliding of the secondary board 4, the water volume between the liquid storage tank 2 and the two secondary boards 4 can flow into the secondary board 4 through the one-way valve pipe 8 at the bottom end of the secondary board 4, so as to reduce the resistance of the secondary board 4 to the water flow during downward sliding. After entering the secondary board 4 and being filtered by the filter screen 42, the water flow flows into the liquid storage tank 2 through the one-way valve pipe 8 at the top of the secondary board 4. When the main board 3 slides downward, the inner gear ring 33 inside the main board 3 can be driven, so that the inner gear ring 33 can drive the guide rotating rod 34 to rotate. Thus, through the action of the communication pipe 32 and the one-way valve pipes 8 at both ends, the liquid inside the liquid storage tank 2 can flow from the one-way valve pipe 8 at the top to the one-way valve pipe 8 at the bottom end, so that the water flow can impact the inner wall of the bottom valve box 1 of the main board 3 to prevent the accumulation of sediment. The sediment is impacted by the water flow and flows to both sides, and is blocked by the secondary board 4 and gradually moves upward, which can generate an inward-opening impact force on the opening and closing plate 43 of the secondary board 4, so that the sediment can flow into the secondary board 4 from the opening and closing plate 43. Then, the water filtered by the filter screen 42 inside the secondary board 4 can flow back into the liquid storage tank 2 from the top one-way valve pipe 8. When the tertiary board 5, the secondary board 4 and the main board 3 slide upward in sequence, the excess water inside the liquid storage tank 2 can flow downward from the one-way valve pipe 8 at its bottom end. When the main board 3 moves upward, the guide rotating rod 34 rotates in the reverse direction, but due to the action of the one-way valve pipes 8 at both ends of the communication pipe 32, the water inside the valve box 1 will not be pumped into the liquid storage tank 2. Moreover, the main board 3, the secondary board 4 and the tertiary board 5 can be respectively driven by the driving component 6 for separate closing or opening. After the tertiary board 5 and the main board 3 slide downward, the secondary board 4 can be directly taken out from the inside of the liquid storage tank 2 and the valve box 1 by detaching the box cover 102 from the valve box 1, so as to clean the sediment accumulated inside the secondary board 4, thereby further improving the use effect and service life of the integral flat valve.

[0029] In this embodiment: The driving assembly 6 includes a bottom rod 61 rotatably connected to the inner side wall of the valve box 1. The outer side of the bottom rod 61 is rotatably connected to the inner top wall of the liquid storage tank 2. A bottom gear 611 is fixedly installed on the outer side of the top end of the bottom rod 61. A top rod 62 is arranged at the top end of the bottom rod 61. The bottom end of the top rod 62 is fixedly connected to the inner side wall of the valve box 1. A main rotating rod 63 is rotatably connected to the inner side wall of the valve box 1. The inner side wall of the main rotating rod 63 is rotatably connected to the inner side wall of the top rod 62. A main gear 631 is fixedly installed at the bottom end of the main rotating rod 63. The main gear 631 is threadedly connected to the outer side of the top end of the top rod 62. Two linkage gears 632 are rotatably connected to the inner side wall of the valve box 1. The outer sides of the main gear 631 and the bottom gear 611 are meshed with the linkage gears 632.

[0030] During specific use, when it is necessary for the secondary plate 5, the auxiliary plate 4, and the main plate 3 to slide downward in sequence, the main rotating rod 63 can be used to drive the main gear 631 to rotate threadedly on the top rod 62, so that the main gear 631 can slide downward while rotating, and then it can be used to drive the secondary plate 5 and the auxiliary plate 4 to slide downward in sequence. When sliding to the bottom of the top rod 62 and only rotatably connected to the top rod 62, at this time, the main rotating rod 63 can drive the main gear 631 to rotate in place, so that through the action of the linkage gear 632, the bottom gear 611 on the bottom rod 61 can be driven, so that the bottom rod 61 rotates inside the liquid storage tank 2 and the valve box 1. When the main gear 631 is not pulled upward, when the main rotating rod 63 rotates, it can only be used to drive the bottom rod 61 to rotate, so as to control the lifting of the main plate 3. At this time, the auxiliary plate 4 and the secondary plate 5 can also be driven respectively, so as to facilitate the lifting during specific use.

[0031] In this embodiment: The driving assembly 6 further includes four driving rods 64 rotatably connected to the inner side wall of the valve box 1. The top ends of the four driving rods 64 are rotatably connected to the bottom end of the box cover 102. Driven gears 641 are fixedly installed on the outer sides of the driving rods 64. The driven gears 641 are meshed with the main gear 631. Two first transition gears 65 are also rotatably connected to the inner side wall of the valve box 1. A secondary gear 44 and a secondary gear 52 are fixedly installed at the top ends of one of the secondary screw rods 41 and the secondary screw rod 51 respectively. The first transition gears 65 are meshed with the secondary gear 44 and the driven gears 641 respectively. Two transition rods 66 are also rotatably connected to the inner side wall of the valve box 1. A second transition gear 661 is fixedly installed at the top end of one of the transition rods 66. The second transition gear 661 is meshed with the secondary gear 52.

[0032] During specific use, when the main rotating rod 63 drives the main gear 631 to rotate in a threaded connection on the ejector rod 62, two of the driving rods 64 and the driven gear 641 can be synchronously driven to rotate by the rotation of the main gear 631, thereby driving the transition rod 66. Then, through the action of the second transition gear 661 on the secondary gear 52 on the secondary screw rod 51, the secondary screw rod 51 can be rotated to drive the secondary plate 5 to slide downward. When the secondary plate 5 slides downward to half, at this time, the main gear 631 meshes with all four driven gears 641. The other two driven gears 641 can be rotated, and through the action of the first transition gear 65 on the secondary gear 44 on the secondary screw rod 41, the secondary screw rod 41 can rotate on the top cover and drive the secondary plate 4 downward, so that the secondary plate 4 cuts off the valve box 1. Subsequently, the secondary plate 5, the secondary plate 4, and the main plate 3 can be driven to lift and lower in sequence.

[0033] In this embodiment: The driving assembly 6 further includes first pulleys 67 fixedly installed on the outer sides of the bottom rod 61 and the top of the main screw rod 31. A main transmission belt 671 is sleeved on the outer side of the first pulley 67. Second pulleys 68 are fixedly installed on the outer sides of the bottom ends of one of the driving rods 64, the bottom end of the transition rod 66, the top of the secondary screw rod 41, and the top of the secondary screw rod 51. Secondary transmission belts 681, secondary transmission belts 682, first transmission belts 683, and second transmission belts 684 are respectively sleeved on the outer sides of the second pulleys 68.

[0034] During specific use, when two of the driving rods 64 rotate, one of the transition rods 66 can be driven to rotate through the action of the second pulley 68 and the first transmission belt 683 between the driving rod 64 and the transition rod 66, and the other transition rod 66 can also be driven through the action of the second pulley 68 and the second transmission belt 684. Subsequently, one of the secondary screw rods 51 can be driven to rotate. At this time, the two secondary screw rods 51 can also be synchronously rotated through the action of the second pulley 68 and the secondary transmission belt 682 to drive the secondary plate 5 to lift and lower. When the main gear 631 drives the other two driving rods 64 to rotate, the secondary screw rod 41 can be driven through the action of the driven gear 641 on the first transition gear 65. At this time, the two secondary screw rods 41 can simultaneously drive the secondary plate 4 to lift and lower through the action of the second pulley 68 and the secondary transmission belt 681. When the main gear 631 disengages from the driven gear 641, the driving rod 64 can rotate independently to drive the secondary plate 4 and the secondary plate 5 respectively, and the main gear 631 can drive the bottom rod 61 to rotate. The bottom rod 61 synchronously drives the main screw rod 31 to rotate through the action of the first pulley 67 and the main transmission belt 671 to drive the main plate 3 to lift and lower.

[0035] In this embodiment: The flow guiding assembly 7 includes a main rotating shaft 71 rotatably connected to the inner side wall of the main plate 3. The inner side wall of the main rotating shaft 71 is slidably connected to the outer side of the bottom rod 61. A first gear 72 is fixedly installed on the outer side of the main rotating shaft 71.

[0036] During specific use, when the bottom rod 61 rotates, it can drive the main rotating shaft 71 to rotate inside the main board 3 through the action of the bottom rod 61 on the main rotating shaft 71, and the bottom rod 61 can slide inside the main rotating shaft 71. When the main board 3 moves up and down, it can maintain the drive of the main rotating shaft 71, and the main rotating shaft 71 can drive the first gear 72 to rotate when rotating.

[0037] In this embodiment: The diversion assembly 7 further includes a second gear 73 rotatably connected to the inner walls on both sides of the main board 3. The outer sides of the second gears 73 are respectively meshed with the inner gear ring 33 and the first gear 72.

[0038] During specific use, when the first gear 72 rotates, through the action of the second gear 73, the second gear 73 can rotate rapidly, and then through the action of the inner gear ring 33 on the second gear 73, it can drive the diversion rotating rod 34 to rotate inside the communication pipe 32 to divert the water flow.

[0039] In this embodiment: Two limit posts 103 are fixedly installed at the bottom end of the box cover 102. The outer sides of the bottom ends of the two limit posts 103 are slidably connected to the inner wall of the top end of the valve box 1, and the inner walls of the top end of the box cover 102 are respectively movably connected to the outer sides of the top ends of the main rotating rod 63 and the driving rod 64.

[0040] During specific use, the box cover 102 can synchronously drive the limit posts 103 to insert the auxiliary plate 4 into the valve box 1, so as to limit the top of the auxiliary plate 4 through the limit posts 103. When the box cover 102 is separated from the valve box 1, the main rotating rod 63 and the driving rod 64 can be separated from the box cover 102 and operate and rotate on the valve box 1.

[0041] In this embodiment: Four fixing bolts 104 are threadedly connected to the periphery of the box cover 102, and the bottom ends of the four fixing bolts 104 are threadedly connected to the inner wall of the top end of the valve box 1.

[0042] During specific use, the box cover 102 and the valve box 1 are installed and fixed through the fixing bolts 104.

[0043] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wellhead safety cut-off flat valve, comprising a valve box (1), characterized in that: The two ends of the valve box (1) are fixedly mounted with delivery pipes (101), the top of the valve box (1) is provided with a box cover (102), the inner wall of the bottom end of the valve box (1) is fixedly mounted with a liquid storage box (2), the inner side walls of the liquid storage box (2) are slidably connected with a main board (3) and two auxiliary boards (4), the inner side walls of the valve box (1) are also slidably connected with two secondary boards (5), the inner walls of the two ends of the main board (3), the auxiliary board (4) and the secondary board (5) are respectively threadedly connected with a main screw (31), an auxiliary screw (41) and a secondary screw (51), the inner side wall of the valve box (1) is provided with a drive assembly ( 6), two connecting pipes (32) are fixedly mounted on the inner side wall of the main board (3), the inner side walls of the two connecting pipes (32) are rotatably connected to an inner gear ring (33), a flow guide rotating rod (34) is fixedly mounted on the inner side wall of the inner gear ring (33), a flow guide assembly (7) is provided on the inner side wall of the main board (3), a filter screen (42) is fixedly mounted on the inner side wall of the auxiliary board (4), an opening and closing plate (43) is also rotatably connected to the inner side wall of the auxiliary board (4), and one-way valve pipes (8) are fixedly mounted on both ends of the connecting pipe (32), both sides of the bottom end of the liquid storage tank (2) and both ends of the auxiliary board (4).

2. A wellhead safety cut-off flat valve according to claim 1, characterized in that: The driving assembly (6) comprises a bottom rod (61) rotatably connected to the inner wall of the valve box (1); the outer side of the bottom rod (61) is rotatably connected to the inner wall of the top end of the liquid storage tank (2); a bottom gear (611) is fixedly mounted on the outer side of the top end of the bottom rod (61); a top rod (62) is provided at the top end of the bottom rod (61); the bottom end of the top rod (62) is fixedly connected to the inner wall of the valve box (1); the inner wall of the valve box (1) is rotatably connected to the main gear (611); Rod (63), the inner side wall of the main rotating rod (63) is rotatably connected to the inner side wall of the top rod (62), the bottom end of the main rotating rod (63) is fixedly mounted with a main gear (631), the main gear (631) is threadedly connected to the outer side of the top end of the top rod (62), the inner side wall of the valve box (1) is rotatably connected to two interlocking gears (632), the outer sides of the main gear (631) and the bottom gear (611) are meshed with the interlocking gears (632).

3. A wellhead safety cut-off flat valve according to claim 2, characterized in that: The driving assembly (6) further comprises four driving rods (64) rotatably connected to the inner wall of the valve box (1), the top ends of the four driving rods (64) being rotatably connected to the bottom end of the box cover (102), the outer sides of the driving rods (64) being fixedly mounted with driven gears (641), the driven gears (641) being meshed with the main gear (631), the inner wall of the valve box (1) being further rotatably connected with two first transition gears (65), the top ends of one of the secondary screw rods (41) and the secondary screw rod (51) being respectively fixedly mounted with a secondary gear (44) and a secondary gear (52), the first transition gear (65) being respectively meshed with the secondary gear (44) and the driven gear (641), the inner wall of the valve box (1) being further rotatably connected with two transition rods (66), the top end of one of the transition rods (66) being fixedly mounted with a second transition gear (661), the second transition gear (661) being meshed with the secondary gear (52).

4. A wellhead safety cut-off flat valve according to claim 3, characterized in that: The driving assembly (6) further comprises a first pulley (67) fixedly mounted on the outer sides of the bottom rod (61) and the top ends of the main screw rod (31), the outer sides of the first pulley (67) being sleeved with a main transmission belt (671), and the bottom ends of one of the driving rods (64), the bottom ends of the transition rods (66), the outer sides of the top ends of the auxiliary screw rods (41) and the outer sides of the top ends of the secondary screw rods (51) being fixedly mounted with a second pulley (68), the outer sides of the second pulley (68) being sleeved with an auxiliary transmission belt (681), a secondary transmission belt (682), a first transmission belt (683) and a second transmission belt (684) respectively.

5. A wellhead safety cut-off flat valve according to claim 1, characterized in that: The guide assembly (7) comprises a main rotating shaft (71) rotatably connected to the inner wall of the main board (3), the inner wall of the main rotating shaft (71) is slidably connected to the outer side of the bottom rod (61), and a first gear (72) is fixedly mounted on the outer side of the main rotating shaft (71).

6. A wellhead safety cut-off flat valve according to claim 5, characterized in that: The flow guide assembly (7) further comprises a second gear (73) rotatably connected to the inner walls on both sides of the main board (3), and the outer sides of the second gear (73) are respectively meshed with the inner gear ring (33) and the first gear (72).

7. A wellhead safety cut-off flat valve according to claim 3, characterized in that: Two limit posts (103) are fixedly mounted on the bottom end of the box cover (102), the outer sides of the bottom ends of the two limit posts (103) are slidably connected to the top inner wall of the valve box (1), and the top inner wall of the box cover (102) is movably connected to the top outer sides of the main rotating rod (63) and the driving rod (64), respectively.

8. A wellhead safety cut-off flat valve according to claim 1, characterized in that: The box cover (102) is threadedly connected with fixing bolts (104) on all sides, and the bottom ends of the four fixing bolts (104) are threadedly connected to the top inner wall of the valve box (1).

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