Large-drift-diameter ultrahigh-pressure sand-prevention wellhead fracturing valve

Abstract

The invention belongs to the technical field of sand-prevention wellhead fracturing valves, and particularly relates to a large-drift-diameter ultrahigh-pressure sand-prevention wellhead fracturing valve which comprises a main valve body, the two sides of the main valve body communicate with two sets of auxiliary valve bodies correspondingly, the bottom of the main valve body is sleeved with a fixing frame, the two sides of the fixing frame are symmetrically provided with two sets of storage frames correspondingly, and a supporting mechanism is arranged between the two sets of storage frames. The supporting mechanism comprises a crossed shear type telescopic frame, a node at one end of the crossed shear type telescopic frame is hinged to a fixing frame, two sets of supporting tables are installed on two sets of nodes located in the middle of the crossed shear type telescopic frame, and due to the fact that the crossed shear type telescopic frame can stretch out and draw back freely, after the crossed shear type telescopic frame is contracted, the length of the whole supporting mechanism can be shortened; therefore, the size of the whole supporting mechanism is reduced, and workers can conveniently store and carry the supporting mechanism under the condition that the supporting mechanism is not disassembled.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sand control wellhead fracturing valves, in particular to a large-diameter super-high-pressure sand control wellhead fracturing valve. BACKGROUND

[0002] The sand control wellhead fracturing valve is a key equipment for oil and gas well fracturing operation, mainly installed on the wellhead device, used for controlling the injection and flowback of fracturing fluid, and preventing formation sand from entering the wellbore to protect the wellhead equipment and pipe string. The valve usually has the characteristics of high strength, high pressure resistance and corrosion resistance, and can withstand the high pressure impact generated during fracturing. Its internal structure is usually specially designed, such as replaceable valve seat and valve core, to facilitate maintenance and prolong service life. The sand control function is usually realized through built-in filtering devices or special flow channels to effectively block sand particles and prevent valve jamming or wear.

[0003] The patent with publication number CN221119911U discloses a high-pressure manifold and sand control fracturing valve for fracturing wellhead, which comprises a main valve body, a support device, a secondary valve body and a connecting pipe. The secondary valve body is provided with four groups, which are symmetrically arranged on both sides of the main valve body. The main valve body is provided with a connecting pipe, and the bottom of the main valve body is provided with a support device for supporting the secondary valve body. The support device comprises a support plate, a sliding plate, a threaded rod and an indication device. Rotating the threaded rod allows it to rotate on the surface of the sliding plate. When the threaded rod rotates, it also rotates in the inner wall of the top plate and the support frame. The rotation of the threaded rod drives the movement of the top plate, which in turn drives the movement of the soft top. After the soft top moves to the appropriate height, the secondary valve body is placed on the surface of the soft top, and then the secondary valve body and the main valve body are connected together. The support plate, sliding plate, threaded rod and top plate can support the secondary valve body to a certain extent, and the soft top can fit the secondary valve body to a certain extent. The threaded rod can also adjust the height of the top plate according to the secondary valve body.

[0004] In the above-mentioned scheme, the entire support device extends to both sides of the main valve body, so that the support device supports the secondary valve body. However, the length and volume of the support device are relatively large, which is not convenient for workers to store and transport the support device. If you want to reduce the length of the support device, you need to disassemble the support device, which makes the workers more troublesome to use the support device during use. Therefore, the present application provides a large-diameter super-high-pressure sand control wellhead fracturing valve. SUMMARY

[0005] In order to make up for the shortcomings of the prior art and solve at least one technical problem raised in the background art.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention provides a large-diameter ultra-high pressure sand-proof wellhead fracturing valve, including a main valve body, two sets of auxiliary valve bodies connected to both sides of the main valve body, a fixing frame fitted at the bottom of the main valve body, two sets of storage frames symmetrically arranged on both sides of the fixing frame, and a support mechanism between the two sets of storage frames. The support mechanism includes a cross-shaped telescopic frame, a node at one end of the cross-shaped telescopic frame is hinged to the fixing frame, two sets of support platforms are installed on two sets of nodes located in the middle of the cross-shaped telescopic frame, the support platforms are used to place the auxiliary valve bodies, two sets of nodes at the other end of the cross-shaped telescopic frame are hinged to two sets of hinge seats, both sets of hinge seats are slidably connected to slide rails, the slide rails are fixedly installed on the card plate, and the support mechanism also includes multiple sets of rollers, the rollers are rotatably installed on the nodes located on both sides of the cross-shaped telescopic frame, the rollers provide support for the entire support mechanism; Because the scissor-type telescopic frame can extend and retract freely, when the scissor-type telescopic frame is retracted, the length of the entire support mechanism will be shortened, thereby reducing the volume of the entire support mechanism. This makes it easier for staff to store and move the support mechanism without disassembling it.

[0007] Preferably, the support mechanism is provided with a limiting mechanism at its bottom. The limiting mechanism includes a crossbar, a node connecting the crossbar to the scissor-type telescopic frame at the middle of the crossbar, two sets of movable blocks symmetrically installed at both ends of the crossbar, a first spring at one end of each movable block, a locking block movably inserted into the movable block, a movable rod fixedly connected to the movable block, a second spring sleeved on the movable rod, a hook hinged to the movable rod, a locking rod for engaging the hook, and two sets of side plates symmetrically distributed at both ends of the locking rod. The side plates are fixedly installed inside the movable block, and the first spring is located inside the storage frame. One end of the first spring is fixedly connected to... The inner wall of the receiving rack has a first spring fixedly connected to a movable block at the other end. Two sets of guide rails are symmetrically arranged inside the receiving rack. Two sets of sliding grooves are symmetrically opened on the movable block. The two sets of guide rails are slidably connected to the two sets of sliding grooves respectively. An unlocking rod is fixedly installed inside the receiving rack. A clearance groove is opened on one side of the movable block. The unlocking rod is used to push the end of the hook through the clearance groove. A rectangular guide groove is opened at the upper end of the movable block. The locking block is movably inserted into the rectangular guide groove. A limit block and an unlocking block are fixedly installed on the upper side inside the receiving rack. The limit block is used to lock the locking block. The movable rod is movably installed inside the movable block. Until the end of the locking block is squeezed by the limiting block, the locking block moves along the rectangular guide groove towards the locking rod, and the locking block compresses the second spring. Under the rebound force of the second spring, the locking block is limited between the limiting block and the unlocking block. At this time, the extension length of the scissor-type telescopic frame is just right so that the two sets of support platforms are precisely located directly below the installation positions of the two sets of auxiliary valve bodies, thereby improving the installation efficiency of the auxiliary valve bodies. The rebound force of the first spring keeps the scissor-type telescopic frame in a retracted state, thereby preventing the scissor-type telescopic frame from unfolding on its own, which would affect the storage and transportation of the scissor-type telescopic frame.

[0008] Preferably, the supporting mechanism further comprises a guide rod, one end of the guide rod is fixedly connected with the clamping plate, the other end of the guide rod is movably inserted into a guide sleeve, and the guide sleeve is fixedly installed on the node of the intersecting telescopic frame, and the guide sleeve plays a guiding role on the movement of the guide rod. The clamping plate drives the guide rod to move, the guide rod slides along the guide sleeve, and under the cooperation of the guide rod and the guide sleeve, the clamping plate is always kept in the middle position at the other end of the intersecting telescopic frame during movement, so that the clamping plate can accurately clamp the end portions of the two groups of storage frames during the contraction of the intersecting telescopic frame.

[0009] The beneficial effects of the present application are as follows: 1. Since the intersecting telescopic frame can be freely telescoped, when the intersecting telescopic frame is contracted, the length of the entire supporting mechanism will be shortened, thereby reducing the volume of the entire supporting mechanism, and the staff can conveniently store and carry the supporting mechanism without disassembling the supporting mechanism.

[0010] 2. During the stretching of the intersecting telescopic frame, the intersecting telescopic frame drives the cross rod to move together with the two groups of movable blocks, the sliding groove on the movable block slides along the guide rail to guide the movement of the movable block, and at the same time, the movable block stretches the first spring, the movable block drives the clamping block to move towards the limiting block, until the end portion of the clamping block is pressed by the limiting block, the clamping block moves along the rectangular guide groove towards the clamping rod, and the clamping block compresses the second spring, until the clamping block is limited between the limiting block and the unlocking block under the rebounding force of the second spring, at this time, the stretching length of the intersecting telescopic frame is just right to make the two groups of supporting tables accurately located below the installation positions of the two groups of auxiliary valve bodies, thereby improving the installation efficiency of the staff on the auxiliary valve body.

[0011] 3. When the intersecting telescopic frame needs to be contracted, continue to stretch the intersecting telescopic frame, the end portion of the clamping block will be pressed by the unlocking block, the pressing of the clamping block by the unlocking block causes the second spring to be compressed more relative to the limiting block, so that the moving distance of the clamping block becomes larger, the clamping block drives the movable rod and the clamping hook to move together, during this process, the lower end of the clamping hook will be pressed by the clamping rod, so that the clamping hook swings to one side, until the movable block is blocked by the unlocking block and cannot move, under the action of gravity, the lower end of the clamping hook is just clamped with the clamping rod, so that the clamping block cannot move, at this time, the intersecting telescopic frame is loosened, under the rebounding force of the first spring, the movable block moves back, until the unlocking rod passes through the avoiding groove and reaches the lower end of the clamping hook, the clamping of the clamping hook and the clamping rod is released, under the rebounding force of the second spring, the clamping block returns to the initial position, and the rebounding force of the first spring makes the intersecting telescopic frame be in the contracted state, thereby avoiding the self-expansion of the intersecting telescopic frame, which affects the storage and carrying of the intersecting telescopic frame. BRIEF DESCRIPTION OF DRAWINGS

[0012] The present application will be further described below in conjunction with the drawings.

[0013] Figure 1 It is a partial structural schematic view of the present application.

[0014] Figure 2 It is a schematic view of the combination of the auxiliary valve body, the fixed frame and the supporting mechanism of the application.

[0015] Figure 3 It is a schematic view of the combination of the auxiliary valve body, the fixed frame and the supporting mechanism of the application. Figure 2 It is an enlarged view of the middle A.

[0016] Figure 4 It is a schematic view of the combination of the auxiliary valve body, the fixed frame and the supporting mechanism of the application.

[0017] Figure 5 It is a schematic view of the combination of the auxiliary valve body, the fixed frame and the supporting mechanism of the application.

[0018] Figure 6 It is a schematic view of the combination of the auxiliary valve body, the fixed frame and the supporting mechanism of the application.

[0019] Figure 7 It is a schematic view of the combination of the auxiliary valve body, the fixed frame and the supporting mechanism of the application.

[0020] Figure 8 It is a schematic view of the combination of the auxiliary valve body, the fixed frame and the supporting mechanism of the application. Figure 7 It is an enlarged view of the middle B.

[0021] Figure 9 It is a schematic view of the combination of the auxiliary valve body, the fixed frame and the supporting mechanism of the application.

[0022] Figure 10 It is a schematic view of the combination of the auxiliary valve body, the fixed frame and the supporting mechanism of the application.

[0023] In the figure: 1, main valve body; 2, auxiliary valve body; 3, fixed frame; 4, storage rack; 41, guide rail; 42, unlocking rod; 43, limiting block; 44, unlocking block; 5, supporting mechanism; 501, cross-cut telescopic frame; 502, supporting table; 503, hinged seat; 504, sliding rail; 505, clamping plate; 506, roller; 507, guide rod; 508, guide sleeve; 6, limiting mechanism; 601, horizontal rod; 602, movable block; 6021, sliding groove; 6022, rectangular guide groove; 6023, avoiding groove; 603, first spring; 604, clamping block; 605, movable rod; 606, second spring; 607, clamping hook; 608, clamping rod; 609, side plate. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, purposes and effects realized by the application easy to understand, the application will be further described below in combination with specific embodiments.

[0025] Embodiment one: asFigures 1 to 3 As shown in the embodiment of the present invention, a large-diameter ultra-high pressure sand-proof wellhead fracturing valve includes a main valve body 1, with two sets of auxiliary valve bodies 2 connected to both sides of the main valve body 1. A fixing frame 3 is fitted at the bottom of the main valve body 1, and two sets of storage frames 4 are symmetrically arranged on both sides of the fixing frame 3. A support mechanism 5 is arranged between the two sets of storage frames 4. The support mechanism 5 includes a shear-type telescopic frame 501, with a node at one end of the shear-type telescopic frame 501 hinged to the fixing frame 3. Two sets of support platforms 502 are installed on the shear-type telescopic frame 501. At the two sets of nodes in the middle of the telescopic frame 501, the support platform 502 is used to place the auxiliary valve body 2. At the other end of the telescopic frame 501, the two sets of nodes are hinged to two sets of hinge seats 503. Both sets of hinge seats 503 are slidably connected to the slide rail 504. The slide rail 504 is fixedly installed on the card plate 505. The support mechanism 5 also includes multiple sets of rollers 506. The rollers 506 are rotatably installed on the nodes located on both sides of the telescopic frame 501. The rollers 506 provide support for the entire support mechanism 5.

[0026] Specifically, in the initial state, the scissor-type telescopic frame 501 is in a retracted state and located between the two sets of storage racks 4. The locking plates 505 are engaged at the ends of the two sets of storage racks 4. When the secondary valve body 2 needs to be installed, the two sets of locking plates 505 are pulled in opposite directions. The locking plates 505 drive the scissor-type telescopic frame 501 through the slide rail 504 and the two sets of hinge seats 503, causing the scissor-type telescopic frame 501 to be stretched. During the stretching process, the hinge seats 503 slide along the slide rail 504, and the multiple sets of rollers 506 on the scissor-type telescopic frame 501 roll along the ground, causing the two sets of scissor-type telescopic frames 501 to unfold. Then, the secondary valve body 2 is placed on the corresponding support 502, and then the secondary valve body 2 is connected to the main valve body 1 by bolts. The auxiliary valve body 2 is connected to the main valve body 1 to assemble the fracturing valve. When the fracturing valve needs to be disassembled, the auxiliary valve body 2 is removed, and the support mechanism 5 is returned to its initial state. Compared with the prior art, since the cross-type telescopic frame 501 can extend and retract freely, when the cross-type telescopic frame 501 is retracted, the length of the entire support mechanism 5 will be shortened, thereby reducing the volume of the entire support mechanism 5. Without disassembling the support mechanism 5, it is convenient for the staff to store and transport the support mechanism 5.

[0027] like Figures 4 to 9As shown, the bottom of the supporting mechanism 5 is provided with a limiting mechanism 6, which includes a crossbar 601, a node of the cross shear telescopic frame 501 connected to the middle of the crossbar 601, two groups of movable blocks 602 symmetrically installed at both ends of the crossbar 601, a first spring 603 provided at one end of the movable block 602, a clamping block 604 movably inserted into the movable block 602, a movable rod 605 fixedly connected to the movable block 602, a second spring 606 sleeved on the movable rod 605, a clamping hook 607 hinged to the movable rod 605, a clamping rod 608 for clamping the clamping hook 607, two groups of side plates 609 symmetrically distributed at both ends of the clamping rod 608, the side plates 609 being fixedly installed in the movable block 602, the first spring 603 being located in the storage rack 4, one end of the first spring 603 being fixedly connected to the inner wall of the storage rack 4, the other end of the first spring 603 being fixedly connected to the movable block 602, two groups of guide rails 41 being symmetrically provided in the storage rack 4, two groups of sliding grooves 6021 being symmetrically provided on the movable block 602, the two groups of guide rails 41 being respectively slidably connected to the two groups of sliding grooves 6021, an unlocking rod 42 being fixedly installed in the storage rack 4, an avoiding groove 6023 being provided on one side of the movable block 602, the unlocking rod 42 being used for pushing the end of the clamping hook 607 through the avoiding groove 6023, a rectangular guide groove 6022 being provided at the upper end of the movable block 602, the clamping block 604 being movably inserted into the rectangular guide groove 6022, a limiting block 43 and an unlocking block 44 being fixedly installed on the upper side in the storage rack 4, the limiting block 43 being used for clamping the clamping block 604, and the movable rod 605 being movably installed in the movable block 602.

[0028] Specifically, in the process of unfolding the cross shear telescopic frame 501, it is necessary to stretch the cross shear telescopic frame 501 in cooperation with the installation positions of the two groups of auxiliary valve bodies 2. The installation positions of the two groups of auxiliary valve bodies 2 are fixed, and the staff cannot accurately and one-time stretch the cross shear telescopic frame 501 to make the two groups of supporting tables 502 just located below the installation positions of the two groups of auxiliary valve bodies 2, thereby reducing the installation efficiency of the auxiliary valve bodies 2. Secondly, after the cross shear telescopic frame 501 is contracted, the cross shear telescopic frame 501 is easy to unfold by itself in the process of storage and carrying of the contracted cross shear telescopic frame 501, which affects the storage and carrying of the cross shear telescopic frame 501. Therefore, in the process of stretching the cross shear telescopic frame 501, the cross shear telescopic frame 501 drives the horizontal rod 601 to move together with the two groups of movable blocks 602, the sliding groove 6021 on the movable block 602 slides along the guide rail 41 to guide the movement of the movable block 602, the movable block 602 stretches the first spring 603, the movable block 602 drives the clamping block 604 to move towards the limiting block 43, until the end of the clamping block 604 is pressed by the limiting block 43, the clamping block 604 moves along the rectangular guide groove 6022 towards the direction of the clamping rod 608, and the clamping block 604 compresses the second spring 606, until the clamping block 604 is limited between the limiting block 43 and the unlocking block 44 under the rebounding force of the second spring 606, at this time, the stretching length of the cross shear telescopic frame 501 is just right to make the two groups of supporting tables 502 accurately located just below the installation position of the two groups of auxiliary valve bodies 2, thereby improving the installation efficiency of the auxiliary valve bodies 2 by the staff, when it is needed to shrink the cross shear telescopic frame 501, the cross shear telescopic frame 501 is continuously stretched, the end of the clamping block 604 will be pressed by the unlocking block 44, the pressing of the unlocking block 44 on the clamping block 604 causes the second spring 606 to be compressed more relative to the limiting block 43, so that the moving distance of the clamping block 604 becomes larger, the clamping block 604 drives the movable rod 605 and the clamping hook 607 to move together, in this process, the lower end of the clamping hook 607 will be pressed by the clamping rod 608, so that the clamping hook 607 swings to one side until the movable block 602 is blocked by the unlocking block 44 and cannot move, under the action of gravity, the lower end of the clamping hook 607 is just clamped with the clamping rod 608, so that the clamping block 604 cannot move, at this time, the cross shear telescopic frame 501 is loosened, under the rebounding force of the first spring 603, the movable block 602 moves back until the unlocking rod 42 passes through the avoiding groove 6023 and reaches the lower end of the clamping hook 607, the clamping of the clamping hook 607 with the clamping rod 608 is released, under the rebounding force of the second spring 606, the clamping block 604 returns to the initial position, and the rebounding force of the first spring 603 makes the cross shear telescopic frame 501 in the shrunk state, thereby avoiding the cross shear telescopic frame 501 from being unfolded automatically, which affects the storage and transportation of the cross shear telescopic frame 501.

[0029] Embodiment two: as shown in Figure 10 Another embodiment of the present application is: the supporting mechanism 5 further comprises a guide rod 507, one end of the guide rod 507 is fixedly connected with the clamping plate 505, the other end of the guide rod 507 is movably inserted into the guide sleeve 508, and the guide sleeve 508 is fixedly installed on the node of the cross shear telescopic frame 501.

[0030] Specifically, in the process of shrinking the above cross shear telescopic frame 501, since the hinged seat 503 is slidingly connected with the slide rail 504, the clamping plate 505 cannot be located at the middle of the other end of the cross shear telescopic frame 501, so that the clamping plate 505 cannot clamp the end of the two groups of storage frames 4, Therefore, when the cross-pinch telescopic frame 501 is contracted, the clamping plate 505 drives the guide rod 507 to move, the guide rod 507 slides along the guide sleeve 508, and the cooperation of the guide rod 507 and the guide sleeve 508 ensures that the clamping plate 505 is always kept in the middle position of the other end of the cross-pinch telescopic frame 501 during movement, thereby ensuring that the clamping plate 505 can accurately clamp the end of the two groups of storage frames 4 during contraction of the cross-pinch telescopic frame 501.

[0031] Working principle: pull the two groups of clamping plates 505 backward, the clamping plates 505 drive the cross-pinch telescopic frame 501 through the slide rails 504 and the two groups of hinged seats 503, so that the cross-pinch telescopic frame 501 is stretched, during the stretching process, the hinged seats 503 slide along the slide rails 504, and the multiple groups of rollers 506 on the cross-pinch telescopic frame 501 roll along the ground, so that the two groups of cross-pinch telescopic frames 501 are unfolded, then the auxiliary valve body 2 is placed on the corresponding supporting table 502, and the auxiliary valve body 2 is connected with the main valve body 1 through the bolts, so that the assembly of the fracturing valve is realized, when the fracturing valve needs to be disassembled, the auxiliary valve body 2 is disassembled, and the supporting mechanism 5 returns to the initial state; In the process of stretching the cross shear telescopic frame 501, the cross shear telescopic frame 501 moves the cross bar 601 together with the two groups of movable blocks 602, the sliding groove 6021 on the movable block 602 slides along the guide rail 41, guiding the movement of the movable block 602, and the movable block 602 stretches the first spring 603, the movable block 602 drives the clamping block 604 to move towards the limiting block 43, until the end of the clamping block 604 is pressed by the limiting block 43, the clamping block 604 moves along the rectangular guide groove 6022 towards the clamping rod 608, and the clamping block 604 compresses the second spring 606, until the clamping block 604 is limited between the limiting block 43 and the unlocking block 44 under the rebounding force of the second spring 606, at this time the stretching length of the cross shear telescopic frame 501 is just right for the two groups of supporting tables 502 to be accurately located below the installation position of the two groups of auxiliary valve bodies 2, when it is needed to shrink the cross shear telescopic frame 501, continue to stretch the cross shear telescopic frame 501, the end of the clamping block 604 will be pressed by the unlocking block 44, the pressing of the unlocking block 44 on the clamping block 604 causes the second spring 606 to compress more relative to the limiting block 43, so that the moving distance of the clamping block 604 becomes larger, the clamping block 604 drives the movable rod 605 and the clamping hook 607 to move together, in this process, the lower end of the clamping hook 607 will be pressed by the clamping rod 608, so that the clamping hook 607 swings to one side, until the movable block 602 is blocked by the unlocking block 44 and cannot move, under the action of gravity, the lower end of the clamping hook 607 is just clamped with the clamping rod 608, so that the clamping block 604 cannot move, at this time the cross shear telescopic frame 501 is loosened, under the rebounding force of the first spring 603, the movable block 602 moves back, until the unlocking rod 42 passes through the avoiding groove 6023 and reaches the lower end of the clamping hook 607, releasing the clamping of the clamping hook 607 and the clamping rod 608, under the rebounding force of the second spring 606, the clamping block 604 returns to the initial position, and the rebounding force of the first spring 603 makes the cross shear telescopic frame 501 be in the shrinking state; When the cross shear telescopic frame 501 is shrunk, the clamping plate 505 drives the guide rod 507 to move, the guide rod 507 slides along the guide sleeve 508, under the cooperation of the guide rod 507 and the guide sleeve 508, the clamping plate 505 always keeps in the middle position of the other end of the cross shear telescopic frame 501 during movement.

[0032] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A large-gauge, ultra-high pressure sand control wellhead fracturing valve comprising a main valve body (1), characterized in that: Both sides of the main valve body (1) are communicated with two groups of auxiliary valve bodies (2), the bottom of the main valve body (1) is sleeved with a fixing frame (3), both sides of the fixing frame (3) are symmetrically provided with two groups of storage frames (4), and the two groups of storage frames (4) are provided with a supporting mechanism (5). The supporting mechanism (5) comprises: A cross-cut type telescopic frame (501), the nodes at one end of the cross-cut type telescopic frame (501) are hingedly connected with the fixing frame (3); Two groups of supporting tables (502), the two groups of supporting tables (502) are installed on two groups of nodes at the middle part of the cross-cut type telescopic frame (501), and the supporting tables (502) are used for placing the auxiliary valve bodies (2); Two groups of nodes at the other end of the cross-cut type telescopic frame (501) are hingedly connected with two groups of hinged seats (503); A slide rail (504), and the two groups of hinged seats (503) are slidably connected with the slide rail (504); The slide rail (504) is fixedly installed on a clamping plate (505).

2. A large-pitch ultra-high-pressure sand-prevention wellhead fracturing valve according to claim 1, characterized in that: The supporting mechanism (5) further comprises a plurality of rollers (506), the rollers (506) are rotatably installed on the nodes at both sides of the cross-cut type telescopic frame (501), and the rollers (506) support the whole supporting mechanism (5).

3. A large-pitch ultra-high-pressure sand-prevention wellhead fracturing valve according to claim 2, characterized in that: The bottom of the supporting mechanism (5) is provided with a limiting mechanism (6), and the limiting mechanism (6) comprises: A cross bar (601), the cross bar (601) is connected with the nodes of the cross-cut type telescopic frame (501) at the middle part; Two groups of movable blocks (602) symmetrically installed at both ends of the cross bar (601); A first spring (603) is arranged at one end of the movable block (602); A clamping block (604) movably inserted in the movable block (602); An activity rod (605) fixedly connected with the movable block (602); A second spring (606) sleeved on the activity rod (605); A clamping hook (607) hingedly connected with the activity rod (605); A clamping rod (608) used for clamping the clamping hook (607); Two groups of side plates (609) symmetrically distributed at both ends of the clamping rod (608) and fixedly installed in the movable block (602).

4. A large-pitch ultra-high-pressure sand-prevention wellhead fracturing valve according to claim 3, characterized in that: The first spring (603) is located in the storage frame (4), one end of the first spring (603) is fixedly connected with the inner wall of the storage frame (4), and the other end of the first spring (603) is fixedly connected with the movable block (602).

5. A large-pitch, ultra-high-pressure sand-control wellhead fracturing valve according to claim 4, characterized in that: Two groups of guide rails (41) are symmetrically arranged in the storage frame (4), and two groups of sliding grooves (6021) are symmetrically formed in the movable block (602), and the two groups of guide rails (41) are slidably connected with the two groups of sliding grooves (6021) respectively.

6. A large-pitch, ultra-high-pressure sand-control wellhead fracturing valve according to claim 5, characterized in that: An unlocking rod (42) is fixedly installed in the storage frame (4), an avoiding groove (6023) is formed in one side of the movable block (602), and the unlocking rod (42) is used for pushing the end of the clamping hook (607) through the avoiding groove (6023).

7. A large-pitch ultra-high-pressure sand-prevention wellhead fracturing valve according to claim 6, characterized in that: A rectangular guide groove (6022) is formed in the upper end of the movable block (602), and the clamping block (604) is movably inserted into the rectangular guide groove (6022).

8. A large-pitch ultra-high-pressure sand-prevention wellhead fracturing valve according to claim 7, characterized in that: The receiving frame (4) is fixedly installed with a limiting block (43) and an unlocking block (44) on the upper side, the limiting block (43) is used for clamping the clamping block (604), and the movable rod (605) is movably installed in the movable block (602).

9. A large-pitch, ultra-high-pressure sand-control wellhead fracturing valve according to claim 8, characterized in that: The supporting mechanism (5) further comprises a guide rod (507), one end of the guide rod (507) is fixedly connected with the clamping plate (505); The guide sleeve (508) movably connects the other end of the guide rod (507).

10. A large-pitch, ultra-high-pressure sand-control wellhead fracturing valve according to claim 9, characterized in that: The guide sleeve (508) is fixedly installed on the node of the cross-cut telescopic frame (501), and the guide sleeve (508) plays a guiding role in the movement of the guide rod (507).

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