Float collar and float shoe device for well cementation

Abstract

The invention relates to a float collar float shoe device for well cementation, and relates to the technical field of oil exploitation, the float collar float shoe device comprises a shell, a valve groove is formed in the shell, a valve ball is inserted in the valve groove, the bottom of the valve ball is fixedly connected with a valve rod, the valve rod is slidably connected with the bottom of the shell, the valve rod is sleeved with a valve spring, and the two ends of the valve spring are fixedly connected with the shell and the valve ball respectively. A sealing assembly is arranged on the shell, the sealing assembly comprises a locking part and an anti-attachment part, and the locking part is used for mechanically locking the valve ball and sealing and shielding the matching surface of the valve ball and the valve groove; through operation of the sealing assembly and insertion rigid locking and limiting of the semi-ring plates, the valve ball is always kept at an accurate sealing position in a non-working state, a fit clearance between the valve groove and the valve ball is sealed and plugged in cooperation with an annular structure formed by the semi-ring plates, and the dual sealing effect of locking and plugging of the valve ball and the valve groove is achieved; and not only is the accidental sealing failure in a non-working state avoided, but also the problem of gap leakage is solved.

Description

Technical Field

[0001] This invention relates to the field of oil extraction technology, specifically to a cementing floatation device. Background Technology

[0002] Float shoes and float collars are key tools in oil drilling cementing operations, typically installed at the end (float shoe) or middle (float collar) of the casing string. They integrate the guiding function of a guide shoe and the one-way flow control function of a backpressure valve. Their main function is to guide the casing smoothly into the well during casing running and to achieve one-way flow of drilling fluid and cement slurry through their internal valve ball or valve core structure. This not only effectively adjusts the buoyancy of the casing string, but more importantly, it immediately seals the pipeline after cementing operations, preventing cement slurry from flowing back into the casing. This ensures the formation of a downhole cement plug that meets design requirements, guaranteeing cementing quality at the casing shoe, which is fundamental to successful cementing operations.

[0003] However, traditional floats and float shoes still face serious challenges in practical applications. Their core backpressure valve structure, especially the valve ball system, lacks reliability in complex downhole environments. On the one hand, the valve ball lacks an effective mechanical locking mechanism when not in operation, making it prone to accidental opening when encountering abnormally high pressure, severe vibration, or pressure fluctuations downhole, leading to premature seal failure, backflow of cement slurry, and cementing operation failure.

[0004] On the other hand, the sealing surfaces of the valve ball and the valve seat are prone to wear after being subjected to the erosion of slurry containing solid particles for a long time. At the same time, impurities are prone to adhere to the surface of the valve ball or get stuck in the gaps between moving parts, causing the valve ball to fail to reset properly or to seal poorly. Summary of the Invention

[0005] A cementing float shoe device includes a housing with a valve groove inside. A valve ball is inserted into the valve groove, and a valve stem is fixedly connected to the bottom of the valve ball. The valve stem is slidably connected to the bottom of the housing. A valve spring is sleeved on the valve stem, and both ends of the valve spring are fixedly connected to the housing and the valve ball, respectively. A sealing assembly is provided on the housing. The sealing assembly includes a locking component and an anti-adhesion component. The locking component is used to mechanically lock the valve ball and seal the mating surface between the valve ball and the valve groove. The anti-adhesion component is used to prevent the retention of slurry particles. The locking component includes four semi-ring plates, with two semi-ring plates on the same horizontal plane engaging with each other. The anti-adhesion component includes eight cams, which engage with the valve ball through a pressing mechanism.

[0006] Furthermore, the locking component also includes two vertical grooves, which are symmetrically opened on the housing. Each vertical groove has two horizontal grooves symmetrically arranged in a vertical array on the side of the groove wall near the valve groove. The groove walls of the two horizontal grooves at the top are jointly provided with an annular groove. A U-shaped rod is slidably connected in the two horizontal grooves on the same side. Two guide rods are symmetrically slidably connected to each of the two U-shaped rods. Both ends of the guide rods are fixedly connected to the groove wall of the vertical groove. Each guide rod is fitted with a spring. Both ends of the springs are fixedly connected to the groove wall of the vertical groove and the U-shaped rod, respectively. Four semi-annular plates are fixedly connected to the top and bottom sides of the two U-shaped rods, respectively. Each semi-annular plate has a plug fixedly connected to the inner annular surface of each half-annular plate.

[0007] Furthermore, the valve ball has two annular grooves, and each annular groove has two symmetrical slots on its wall. A slide rod is slidably connected in each of the two vertical grooves, with the top of the slide rod protruding through the housing. A triangular plate is fixedly connected to the bottom of each slide rod, and a pressure plate is fixedly connected to the top of each slide rod. A rubber ring is fixedly connected to the lower surface of each pressure plate, and the bottom of each rubber ring is fixedly connected to the housing. Two guide rods are symmetrically fixedly connected to the top of each triangular plate, with the top of the guide rod protruding through the housing and fixedly connected to the adjacent pressure plate. A spring is fitted on each guide rod, and the two ends of the spring are fixedly connected to the triangular plate and the wall of the vertical groove, respectively.

[0008] Furthermore, the anti-adhesion component includes a telescopic sleeve, which is sleeved on the valve stem. The telescopic sleeve includes a fixed tube and a telescopic tube. The telescopic tube of the telescopic sleeve is fixedly connected to the bottom of the valve ball, and the fixed tube of the telescopic sleeve is fixedly connected to the housing. A second rubber ring is sleeved on the fixed tube of the telescopic sleeve, and the two ends of the second rubber ring are fixedly connected to the telescopic tube of the telescopic sleeve and the housing, respectively.

[0009] Furthermore, four support frames are fixedly connected in a ring inside the housing. Each support frame is rotatably connected to a rotating shaft. Each rotating shaft is fixedly connected in a ring array to multiple side plates. Eight cams are grouped in pairs, and the two cams in the same group are symmetrically fixedly connected to both ends of the rotating shaft.

[0010] Furthermore, the semi-ring plate is inserted into the first ring groove, the semi-ring plate is inserted into the second ring groove, and the insert rod is inserted into the slot.

[0011] Furthermore, a through groove is provided on the side of the U-shaped rod away from the semi-circular plate, and the groove wall of the U-shaped rod is pressed and fitted with the inclined surface of the triangular plate.

[0012] Furthermore, the cam is made of rubber.

[0013] Compared with the prior art, the beneficial effects of the present invention are: Through the operation of the sealing components, the rigid locking limit of the semi-ring plate ensures that the valve ball always maintains a precise sealing position when not in operation. Combined with the annular structure formed by the semi-ring plates, it seals the gap between the valve groove and the valve ball, achieving a dual sealing effect of locking and sealing the valve ball and valve groove. This not only avoids accidental sealing failure in non-operating conditions but also solves the problem of gap leakage.

[0014] By utilizing the operation of the sealing components, a design was developed that uses the driving force of slurry flow as the striking force to strike the valve ball in real time during liquid flow operations. This causes impurities adhering to the surface of the valve ball to fall off along the curved surface of the ball, ensuring that the valve ball can always accurately fit with the valve groove, thus solving the core problems of difficult resetting and poor sealing. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the overall device of the present invention; Figure 2 This is a cross-sectional schematic diagram of the housing, valve groove, and other structures of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 4 This is a detailed schematic diagram of the valve groove, valve ball, and other structures of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of point B in the middle; Figure 6 This is a schematic diagram showing the positions of the vertical grooves, horizontal grooves, and other structures of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of point C in the middle; Figure 8 This is a cross-sectional schematic diagram of the valve stem, valve spring, and other structures of the present invention; Figure 9 This is a partial cross-sectional schematic diagram of the annular groove and slot structures of the present invention; Figure 10 This is a schematic diagram showing the positions of the support frame, rotating shaft, and other structures of the present invention.

[0016] In the picture: 11. Housing; 12. Valve groove; 13. Valve ball; 14. Valve stem; 15. Valve spring; The sealing assembly includes a locking component and an anti-adhesion component.

[0017] Locking components: 21. Vertical groove; 22. Horizontal groove; 23. Ring groove one; 24. U-shaped rod; 25. Guide rod one; 26. Spring one; 27. Semi-ring plate; 28. Insert rod; 29. ​​Ring groove two; 210. Slot; 211. Slide rod; 212. Triangular plate; 213. Pressure plate; 214. Rubber ring one; 215. Guide rod two; 216. Spring two; Anti-adhesion components: 217, telescopic sleeve; 218, rubber ring II; 219, support frame; 220, rotating shaft; 221, side plate; 222, cam. Detailed Implementation

[0018] To further illustrate the technical means and effects adopted by the present invention in order to achieve the intended purpose, the following detailed description is provided in conjunction with the accompanying drawings and preferred embodiments, based on the specific implementation methods, structures, features and effects of the present invention.

[0019] Reference Figures 1 to 10 As shown, a cementing float shoe device includes a housing 11, a valve groove 12 is provided inside the housing 11, a valve ball 13 is inserted into the valve groove 12, a valve stem 14 is fixedly connected to the bottom of the valve ball 13, the valve stem 14 is slidably connected to the bottom of the housing 11, and a valve spring 15 is sleeved on the valve stem 14, with both ends of the valve spring 15 fixedly connected to the housing 11 and the valve ball 13 respectively.

[0020] In the prior art, the slurry flows from the top of the housing 11 into the interior of the housing 11. The slurry pushes the valve ball 13 downwards from the housing 11, disengaging it from the valve groove 12. This prevents the valve ball 13 from blocking the valve groove 12 and causes the valve spring 15 to be elastically compressed. The slurry then flows through the valve groove 12 and enters the external annulus from the bottom outlet of the housing 11. When the slurry flow at the top ceases, the valve ball 13 moves back to its original position to re-block the valve groove 12 under the elastic extension of the valve spring 15, thus preventing the slurry at the bottom of the housing 11 from flowing back to the top of the housing 11.

[0021] A sealing assembly is provided on the housing 11, which includes a locking component and an anti-adhesion component.

[0022] The locking component is used to mechanically lock the valve ball 13 and to seal and shield the mating surfaces of the valve ball 13 and the valve groove 12.

[0023] Anti-adhesion components are used to prevent the retention of slurry particles.

[0024] The locking component includes two vertical grooves 21 symmetrically arranged on the housing 11. Each vertical groove 21 has two horizontal grooves 22 arranged in a vertical array symmetrically on the side of its wall near the valve groove 12. A common annular groove 23 is formed on the walls of the two top horizontal grooves 22. A U-shaped rod 24 is slidably connected within the two horizontal grooves 22 on the same side. Two guide rods 25 are symmetrically slidably connected to each U-shaped rod 24. Both ends of the guide rods 25 are fixedly connected to the walls of the vertical grooves 21. A spring 26 is fitted onto each guide rod 25, with both ends fixedly connected to the walls of the vertical grooves 21 and the U-shaped rod 24, respectively. A semi-annular plate 27 is fixedly connected to the top and bottom sides of each U-shaped rod 24. A plug rod 28 is fixedly connected to the inner annular surface of each semi-annular plate 27. Two annular grooves 29 are formed on the valve ball 13. Each annular groove 29 has two symmetrical slots 210 on its groove wall. Each of the two vertical grooves 21 has a sliding rod 211 slidably connected to it. The top of the sliding rod 211 protrudes through the housing 11. Each of the two sliding rods 211 has a triangular plate 212 fixedly connected to its bottom end. Each of the two sliding rods 211 has a pressure plate 213 fixedly connected to its top end. Each of the two pressure plates 213 has a rubber ring 214 fixedly connected to its lower surface. The bottom ends of the two rubber rings 214 are fixedly connected to the housing 11. Each of the two triangular plates 212 has two guide rods 215 symmetrically fixedly connected to its top end. The top of the guide rods 215 protrudes through the housing 11 and is fixedly connected to the adjacent pressure plate 213. Each guide rod 215 has a spring 216 fitted on it. The two ends of the spring 216 are fixedly connected to the triangular plate 212 and the groove wall of the vertical groove 21, respectively.

[0025] Among them: the semi-ring plate 27 is inserted into the annular groove 23, the semi-ring plate 27 is inserted into the annular groove 29, and the insert rod 28 is inserted into the slot 210.

[0026] Among them, the two semi-ring plates 27 on the same horizontal plane are interlocked.

[0027] Among them, the U-shaped rod 24 has a through groove on the side away from the semi-ring plate 27, and the groove wall of the U-shaped rod 24 is pressed and fitted with the inclined surface of the triangular plate 212.

[0028] Among them, rubber ring 214 seals the internal structure to prevent the slurry from affecting the slide rod 211, guide rod 215 and other structures.

[0029] The anti-adhesion component includes a telescopic sleeve 217, which is sleeved on the valve stem 14. The telescopic sleeve 217 includes a fixed tube and a telescopic tube. The telescopic tube of the telescopic sleeve 217 is fixedly connected to the bottom of the valve ball 13. The fixed tube of the telescopic sleeve 217 is fixedly connected to the housing 11. A rubber ring 218 is sleeved on the fixed tube of the telescopic sleeve 217. The two ends of the rubber ring 218 are fixedly connected to the telescopic tube of the telescopic sleeve 217 and the housing 11, respectively. Four support frames 219 are fixedly connected in a ring inside the housing 11. Each support frame 219 is rotatably connected to a rotating shaft 220. Each rotating shaft 220 is fixedly connected in a ring array to multiple side plates 221. Two cams 222 are symmetrically fixedly connected to each end of each rotating shaft 220.

[0030] Among them, cam 222 is pressed together with valve ball 13, and cam 222 is made of rubber.

[0031] In the initial state of the sealing assembly, i.e. before the housing 11 is grouted, the structural states are as follows: The valve ball 13 engages with the valve groove 12, sealing the valve groove 12. The valve spring 15 does not undergo elastic deformation. The semi-ring plate 27 is inserted into the annular groove 29, and the insert rod 28 is inserted into the slot 210. The two semi-ring plates 27 on the same horizontal plane engage with each other to form a ring. The guide rod 25 and the spring 216 do not undergo elastic deformation. The telescopic tube of the telescopic sleeve 217 is fully extended from the fixed tube. The rotating shaft 220 does not rotate, and the cam 222 is vertically downward under the action of gravity.

[0032] When the sealing assembly is in operation, i.e. when the housing 11 needs to be grouted, the grout flows downward from the top of the housing 11. During the downward flow of the grout, it impacts the top surfaces of the two pressure plates 213. Under the impact pressure and the guiding action of the slide rod 211 and the second guide rod 215, the pressure plate 213 moves vertically downward. The pressure plate 213 drives the slide rod 211 and the second guide rod 215 to move downward synchronously. The downward movement of the slide rod 211 causes the second spring 216 to be elastically stretched. At the same time, the slide rod 211 drives the triangular plate 212 to move vertically downward. As the triangular plate 212 moves downward, the inclined surface of the triangular plate 212 presses against the groove wall of the U-shaped rod 24. Under the guiding action of the inclined surface, the U-shaped rod 24 is squeezed and pushed away from the valve ball 13. At this time, the U-shaped rod 24 slides away from the valve ball 13 in the transverse groove 22 and on the first guide rod 25, while the first spring 26 is elastically compressed. As the U-shaped rod 24 moves, it drives the semi-annular plate 27 and the insert rod 28 to move away from the valve ball 13, thereby causing the insert rod 28 to be pulled out of the slot 210 and the semi-annular plate 27 to be pulled out of the annular groove 29. The semi-annular plate 27 then moves into the annular groove 23. At this time, the valve ball 13 is no longer confined to the housing 11.

[0033] Then, under the impact of the slurry, the valve ball 13 is pushed downward, and the valve ball 13 drives the valve stem 14 to move vertically downward, so that the valve spring 15 is elastically compressed. At this time, the valve ball 13 is disengaged from the valve groove 12, and the top and bottom sides of the housing 11 are connected through the valve groove 12. The slurry flows through the valve groove 12 and enters the external annulus from the bottom outlet of the housing 11.

[0034] It should be noted that during the continuous grouting process, the pressure plate 213 and valve ball 13 are always subjected to the impact pressure of the grout, and the spring 1 26, spring 2 216, valve spring 15 and other structures always maintain an elastic deformation state.

[0035] During this process, the valve ball 13 moves down to the position corresponding to the rotating shaft 220. At this time, as the slurry flows downward, it impacts multiple side plates 221 on the rotating shaft 220, causing the side plates 221 to drive the rotating shaft 220 to rotate. The rotating shaft 220 then drives the two cams 222 on it to rotate synchronously. As the cams 222 rotate, they periodically squeeze the valve ball 13, thus creating a knocking vibration effect on the valve ball 13.

[0036] As the cam 222 strikes, it generates continuous mechanical vibration and impact force on the valve ball 13. Due to the impact force, the adhering material on the surface of the valve ball 13 falls off along the curved surface of the ball, thus preventing particle adhesion.

[0037] It is important to note that since the slurry impacts from top to bottom, the rotation direction of the cam 222 is also from top to bottom, striking the valve ball 13. This prevents the valve ball 13 from being subjected to a force opposite to the slurry flow, ensuring the stability of the valve ball 13's position. Furthermore, the rubber material of the cam 222 prevents damage to the valve ball 13.

[0038] During the slurry flow, the telescopic sleeve 217 and the second rubber ring 218 provide protective coverage for the valve stem 14, valve spring 15, and other structures, while the first rubber ring 214 provides protective coverage for the structures exposed at the top of the housing 11. This effectively protects the movable structures and prevents them from becoming stuck with particles during slurry flow, thus preventing failure.

[0039] When grouting is completed, the grout no longer exerts impact force on the valve ball 13 and pressure plate 213. At this point, the elastic reset action of the valve spring 15, guide rod 215, and spring 26 causes these structures to reset. It is important to note that because the valve spring 15 has a thicker wire diameter and greater elasticity, the valve ball 13 will be the first to insert into the valve groove 12 and reset, sealing the groove. Then, the guide rod 215 and spring 26 will also elastically reset.

[0040] As the guide rod 215 elastically resets, it pulls the slide rod 211 upwards. The slide rod 211 then moves the triangular plate 212 upwards synchronously with the guide rod 215, so that the triangular plate 212 no longer applies a pushing force to the U-shaped rod 24. As the slide rod 211 and the guide rod 215 reset upwards, the pressure plate 213 also moves upwards to the reset position. As the spring 26 elastically resets, it pulls the U-shaped rod 24 towards the valve ball 13, causing it to move within the transverse groove 22 and along the guide rod 25 towards the valve ball 13. With this movement, the U-shaped rod 24 pushes the semi-annular plate 27 into the annular groove 29 and pushes the insertion rod 28 into the slot 210. At this point, the semi-annular plate 27 and the insertion rod 28 limit and lock the valve ball 13 within the housing 11, preventing movement of the valve ball 13 during non-operating conditions.

[0041] At this time, the four semi-annular plates 27 form two rings on the valve ball 13, and the two semi-annular plates 27 on the same horizontal plane are interlocked with each other. The inner ring side of the semi-annular plate 27 is inserted into the annular groove 29, and the outer ring side of the semi-annular plate 27 is still located outside the valve ball 13. That is, the ring formed by the semi-annular plates 27 spans the fitting gap between the valve ball 13 and the valve groove 12, which plays the role of sealing the fitting gap between the valve ball 13 and the valve groove 12. At the same time, since the upper and lower sides of the valve ball 13 form annular structures, the upper and lower rings are respectively aimed at the liquid inlet side and the liquid outlet side of the valve ball 13, which enhances the sealing effect on the valve ball 13.

[0042] In summary, the following beneficial effects can be achieved through the operation of the sealing assembly: Through the operation of the sealing assembly, the insertion and rigid locking of the semi-ring plate 27 ensures that the valve ball 13 maintains a precise sealing position when not in operation. Combined with the annular structure formed by the semi-ring plate 27, it seals and plugs the gap between the valve groove 12 and the valve ball 13, achieving a dual sealing effect of locking and plugging the valve ball 13 and the valve groove 12. This not only avoids accidental sealing failure when not in operation, but also solves the problem of gap leakage.

[0043] By utilizing the operation of the sealing components, a design was developed that uses the driving force of slurry flow as the striking force to strike the valve ball 13 in real time during the liquid flow operation. This causes impurities adhering to the surface of the valve ball 13 to fall off along the curved surface of the ball, ensuring that the valve ball 13 can always be precisely fitted with the valve groove 12. This solves the core problems of difficult resetting and poor sealing.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention are within the scope of the present invention.

Claims

1. A cementing float shoe device, comprising a housing (11), a valve groove (12) formed inside the housing (11), a valve ball (13) inserted inside the valve groove (12), a valve stem (14) fixedly connected to the bottom of the valve ball (13), the valve stem (14) being slidably connected to the bottom of the housing (11), a valve spring (15) sleeved on the valve stem (14), the two ends of the valve spring (15) being fixedly connected to the housing (11) and the valve ball (13) respectively, characterized in that: A sealing assembly is provided on the housing (11). The sealing assembly includes a locking component and an anti-adhesion component. The locking component is used to mechanically lock the valve ball (13) and seal and shield the mating surface between the valve ball (13) and the valve groove (12). The anti-adhesion component is used to prevent the retention of slurry particles. The locking component includes four semi-ring plates (27). Two semi-ring plates (27) on the same horizontal plane are interlocked with each other. The anti-adhesion component includes eight cams (222). The cams (222) are pressed and engaged with the valve ball (13).

2. The cementing float band and float shoe device according to claim 1, characterized in that: The locking component also includes two vertical grooves (21), which are symmetrically opened on the housing (11). Each vertical groove (21) has two horizontal grooves (22) symmetrically opened in a vertical array on the side of the groove wall near the valve groove (12). A ring groove (23) is opened on the groove wall of the two horizontal grooves (22) at the top. A U-shaped rod (24) is slidably connected in the two horizontal grooves (22) on the same side. Two guide rods (25) are symmetrically slidably connected on each of the two U-shaped rods (24). Both ends of the guide rods (25) are fixedly connected to the groove wall of the vertical groove (21). A spring (26) is sleeved on each guide rod (25). Both ends of the springs (26) are fixedly connected to the groove wall of the vertical groove (21) and the U-shaped rod (24) respectively. Four semi-ring plates (27) are fixedly connected to the top and bottom sides of the two U-shaped rods (24) respectively. A plug rod (28) is fixedly connected to the inner ring surface of each semi-ring plate (27).

3. The cementing float band and float shoe device according to claim 1, characterized in that: Two annular grooves (29) are provided on the valve ball (13). Two slots (210) are symmetrically provided on the groove wall of each annular groove (29). A slide rod (211) is slidably connected in each of the two vertical grooves (21). The top of the slide rod (211) protrudes through the housing (11). A triangular plate (212) is fixedly connected to the bottom of each of the two slide rods (211). A pressure plate (213) is fixedly connected to the top of each of the two slide rods (211). A rubber ring (210) is fixedly connected to the lower surface of each of the two pressure plates (213). 14) The bottom ends of the two rubber rings (214) are fixedly connected to the shell (11). The tops of the two triangular plates (212) are symmetrically fixedly connected to two guide rods (215). The top ends of the guide rods (215) protrude from the shell (11). The top ends of the guide rods (215) are fixedly connected to the adjacent pressure plate (213). Each guide rod (215) is fitted with a spring (216). The two ends of the springs (216) are fixedly connected to the triangular plate (212) and the groove wall of the vertical groove (21) respectively.

4. The well cementing float band and float shoe device according to claim 1, characterized in that: The anti-adhesion component includes a telescopic sleeve (217), which is sleeved on the valve stem (14). The telescopic sleeve (217) includes a fixed tube and a telescopic tube. The telescopic tube of the telescopic sleeve (217) is fixedly connected to the bottom of the valve ball (13). The fixed tube of the telescopic sleeve (217) is fixedly connected to the housing (11). A rubber ring II (218) is sleeved on the fixed tube of the telescopic sleeve (217). The two ends of the rubber ring II (218) are fixedly connected to the telescopic tube of the telescopic sleeve (217) and the housing (11), respectively.

5. A cementing float band / float device according to claim 1, characterized in that: The housing (11) has four support frames (219) fixedly connected in a ring. Each support frame (219) has a rotating shaft (220) rotatably connected to it. Each rotating shaft (220) has multiple side plates (221) fixedly connected in a ring array. Eight cams (222) are in pairs, and the two cams (222) in the same group are symmetrically fixedly connected to the two ends of the rotating shaft (220).

6. A cementing float band and float shoe device according to claim 2, characterized in that: The semi-ring plate (27) is inserted into the first ring groove (23), the semi-ring plate (27) is inserted into the second ring groove (29), and the plug rod (28) is inserted into the slot (210).

7. A cementing float band and float shoe device according to claim 3, characterized in that: A through groove is provided on the side of the U-shaped rod (24) away from the semi-ring plate (27), and the groove wall of the U-shaped rod (24) is pressed and fitted with the inclined surface of the triangular plate (212).

8. A cementing float band and float shoe device according to claim 1, characterized in that: The cam (222) is made of rubber.

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