Blade point type small pipeline desilting centrifugal drill bit

Abstract

The invention provides a blade point type small pipeline desilting centrifugal drill bit which comprises a drill bit body, a centrifugal rotating body and a torsion spring, the centrifugal rotating body is rotationally installed on a rotating shaft of the drill bit body, the torsion spring is installed on the drill bit body to provide torsion Ft to enable the centrifugal rotating body to be folded, and when the centrifugal drill bit rotates, the torsion Ft is driven by the torsion Ft to rotate. And under the action of centrifugal force, the centrifugal rotating body overcomes the torsion Ft to be opened. According to the small pipeline dredging device, different dredging diameters can be expanded according to the rotating speed after the small pipeline dredging device is shrunk and enters the inside through a variable-diameter bent pipeline, small pipeline dredging of pipelines with different diameters can be achieved, a power source and a driver are arranged outside the pipeline, and high-dose radiation can be resisted. The spent fuel post-treatment pipeline dredging device solves the problem of spent fuel post-treatment pipeline dredging, and guarantees passing ability and dredging thoroughness in narrow, variable-diameter, multi-turning and high-radiation pipelines.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power post-processing maintenance, and in particular to a blade-type small pipeline desilting centrifugal drill bit. Background Art

[0002] Spent fuel reprocessing plants mainly transport liquid through pipelines. During long-term operation, pipeline blockage is easy to occur. Due to its high radioactive environment, dredging equipment needs to resist high-dose radiation. At the same time, the inner diameter of the liquid delivery pipeline is less than 40mm, there are many bending points, and the inner diameter of the pipeline varies greatly. The inlet section of the pipeline generally has a smaller inner diameter, while the blocked section has a larger inner diameter. Existing drill dredging is generally suitable for pipeline blockages with unchanged diameters. If you want to dredge a pipeline blockage with a changing diameter, you can only use a drill with a very small outer diameter to pass through the small diameter inlet. Since the inner diameter of the blocked section of the pipeline becomes larger, the drill can only drill a small hole and cannot dredge the entire pipe wall. The dredging is not thorough, and the blockage still exists over a large area. Summary of the invention

[0003] The purpose of the invention is to provide a blade-type centrifugal drill bit for desilting small pipes, which solves the problem that the existing drill bit cannot desilt the entire pipe wall, the desilting is not thorough, and the blockage still exists in a large area.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A blade-type small pipe desilting centrifugal drill comprises a drill body, a centrifugal rotating body, and a torsion spring. The centrifugal rotating body is rotatably mounted on the rotating shaft of the drill body. The torsion spring is mounted on the drill body to provide a torque F t The centrifugal rotating body is retracted, and when the centrifugal drill bit rotates, the centrifugal rotating body overcomes the torque F under the action of centrifugal force. t open;

[0006] The torque F t The following conditions are met:

[0007] F a × G >G×x G +F t ×r0;

[0008] F t ×r0>G×y G ;

[0009] In the formula, G is the gravity of the centrifugal rotating body, F a is the centrifugal force, x G ,y G are the X-axis and Y-axis coordinates of the center of gravity of the rotating body, and r0 is the distance from the torsion spring to the rotation axis.

[0010] Furthermore, the drill bit body includes a main drill bit, a support ring, a retaining ring and the rotating shaft, the support ring is fixed at the bottom of the main drill bit, the rotating shaft and the support ring are spaced apart on the same annular surface, the support ring is fixed at the bottom blade of the main drill bit, the rotating shaft is fixed between the two sections of the support ring, between the two blades of the main drill bit, and the retaining ring is fixed on the support ring to limit the centrifugal rotating body.

[0011] Furthermore, a connecting seat is provided at the bottom of the main drill bit for connecting a flexible shaft.

[0012] Furthermore, the support ring is provided with a plurality of bearings arranged at intervals.

[0013] Furthermore, the centrifugal rotating body includes a ball head, a rotating blade, a limit block, a sleeve and a torsion spring groove, the ball head is arranged at the top end of the rotating blade, the sleeve is arranged at the bottom end of the rotating blade, the torsion spring groove is arranged on both sides of the sleeve for installing the torsion spring, and the limit block is installed on both sides of the sleeve and located on the outside of the torsion spring groove for fixing the torsion spring and limiting the centrifugal rotating body.

[0014] Furthermore, the number of the centrifugal rotating bodies is 4, which are evenly spaced on the rotating shaft. When the centrifugal rotating bodies are opened under the action of centrifugal force, as the rotation speed of the centrifugal drill bit increases, the opened diameter of the centrifugal rotating bodies increases accordingly, so that the opening size of the centrifugal rotating bodies can be controlled by controlling the rotation speed of the centrifugal drill bit, wherein the following formula is the relationship between the rotation speed and the drill bit opening diameter:

[0015]

[0016] D = 2Lsinα;

[0017] Where w is the rotation speed, D is the drill diameter, k is the elastic coefficient of the torsion spring, α is the opening angle of the centrifugal rotor, m is the weight of the centrifugal rotor, g is the gravitational acceleration, and x is G is the X-axis coordinate of the center of gravity of the rotor, and L is the length of the centrifugal rotor.

[0018] Furthermore, the rotating blade is a triangular cone with a length of 12 mm and a width of 3 mm, and the ball head is a sphere with a diameter of 1.3 mm.

[0019] Furthermore, the centrifugal force F a The calculation formula is as follows:

[0020] F a =m×w 2 ×r;

[0021] Where m is the mass of the rotating body, w is the rotation speed, and r is the distance from the center of gravity to the axis of rotation.

[0022] Furthermore, the diameter of the centrifugal drill bit in the retracted state is 15 mm and the length is 15 mm.

[0023] Furthermore, x G When folded, it is 3.3mm, when fully expanded, it is 1mm, and the centrifugal drill bit speed is greater than 410r / min.

[0024] Compared with the prior art, the blade-type small pipe desilting centrifugal drill bit provided by the present invention has the following beneficial effects:

[0025] The invention can be narrowed down and passed through a variable diameter curved pipeline, and after entering the interior, different dredging diameters can be expanded according to the rotation speed, so that small pipelines with different diameters can be dredged, and the power source and drive are both arranged outside the pipeline, which can resist high doses of radiation. The invention solves the dredging problem of spent fuel reprocessing pipelines, and ensures the passability and thoroughness of dredging in narrow, variable diameter, multi-bending, and high-radiation pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the technical description.

[0027] Figure 1 A schematic diagram of the unfolded state of the blade-type small pipe desilting centrifugal drill bit provided by the present invention;

[0028] Figure 2 A schematic diagram of a retracted state of a blade-type small pipe desilting centrifugal drill bit provided by the present invention;

[0029] Figure 3 A schematic diagram of a blade-type small pipe desilting centrifugal drill bit provided by the present invention in a retracted state entering a channel;

[0030] Figure 4 for Figure 3 Side view of

[0031] Figure 5 A schematic diagram of a blade-type small pipe desilting centrifugal drill bit provided by the present invention in a deployed state for desilting;

[0032] Figure 6 for Figure 5 Side view of

[0033] Figure 7 A schematic diagram of the structure of the drill body provided by the present invention;

[0034] Figure 8 A schematic diagram of the structure of the centrifugal rotating body provided by the present invention;

[0035] Fig. 9 A schematic structural diagram of a centrifugal rotating body provided by the present invention from another perspective;

[0036] Fig.10 A schematic diagram of the forces acting on the blade-type small pipe desilting centrifugal drill bit provided by the present invention. DETAILED DESCRIPTION

[0037] The following is further explained in detail through specific implementation methods.

[0038] like Figure 1 and Figure 2 As shown, the present invention provides a blade-type small pipe desilting centrifugal drill, comprising a drill body 1, a centrifugal rotating body 2, a bearing 3 and a torsion spring. The centrifugal drill has a centrifugal rotating body expanded state and a centrifugal rotating body retracted state.

[0039] The drill body 1 is composed of a central drill bit and a circular frame on the periphery. In the natural state, the centrifugal rotating body 2 is retracted by the torsion of the torsion spring, which is convenient for entering the pipeline, especially for turning in the pipeline; the bearing on the circular frame plays a role of supporting and reducing friction. When the drill bit rotates, the centrifugal rotating body 2 overcomes the torsion and opens under the action of centrifugal force, thereby increasing the range of pipeline dredging. The centrifugal rotating body 2 is designed to be blade-shaped, which is convenient for scraping the blockage. The end of the centrifugal rotating body 2 is designed to be spherical to prevent the drill bit from damaging the pipe wall. At the same time, the center of gravity of the centrifugal rotating body 2 is moved backward to facilitate the opening of the rotating body. A limit card is designed on the centrifugal rotating body 2 to ensure that the centrifugal rotating body 2 does not flip back during the dredging process. When the centrifugal rotating body 2 opens under the action of centrifugal force, as the speed of the centrifugal drill bit increases, the diameter of the centrifugal rotating body 2 increases accordingly, so that the opening size and angle of the centrifugal rotating body 2 can be controlled by controlling the speed of the centrifugal drill bit, and then the opening size and angle of the centrifugal rotating body 2 can be adaptively adjusted for different blocked pipe inner diameters to facilitate dredging. Among them, the following formula is the relationship between the rotation speed and the drill opening diameter:

[0040]

[0041] D = 2Lsinα;

[0042] Where w is the rotation speed, D is the drill diameter, k is the elastic coefficient of the torsion spring, α is the opening angle of the centrifugal rotor, m is the weight of the centrifugal rotor, g is the gravitational acceleration, and x is G is the X-axis coordinate of the center of gravity of the rotor, and L is the length of the centrifugal rotor.

[0043] like Figure 3 and Figure 4 As shown in FIG. 5 , when the flexible shaft 4 carries the centrifugal drill bit into the pipeline, the centrifugal drill bit is retracted. During the dredging process, the centrifugal drill bit is opened under the action of centrifugal force as the flexible shaft 4 rotates, and the dredging operation is performed, as shown in FIG. Figure 6 shown.

[0044] like Figure 7 As shown, the drill body 1 includes a main drill bit 5, a support ring 6, a retaining ring 7, a rotating shaft 8 and a connecting seat 9. The main drill bit 5 is conical and is fixedly connected to the support ring 6 for rotary drilling; the support ring 6 is used as a ring frame to connect the bearing 3 and the centrifugal rotating body 2; the retaining ring 7 is fixed on the support ring 6 to limit the centrifugal rotating body 2 (such as Figure 7 As shown, the retaining ring 7 is narrower on the inside and wider on the outside, and the transition part between the inside and the outside has a blocking surface, which prevents the centrifugal rotating body 2 from turning outward, thereby achieving position limiting) and preventing the centrifugal rotating body 2 from turning over due to the resistance of the blockage during the drilling process; the rotating shaft 8 is fixed on the support ring 6 as the rotating shaft of the centrifugal rotating body 2; the connecting seat 9 is fixed on the bottom of the main drill bit 5 and is used to connect the flexible shaft 4. The support ring 6 is arranged at the bottom of the main drill bit 5, and the support ring 6 and the rotating shaft 8 are arranged on the same annular surface and arranged at intervals, that is, each section of the support ring 6 and the rotating shaft 8 are staggered to form a ring, forming the main body of the circular frame, and the support ring 6 and the rotating shaft 8 are both 4 sections. The cross section of the support ring 6 is preferably circular, and the cross section of the rotating shaft 8 is preferably circular. The support ring 6 is provided with a number of bearings 3 arranged at intervals.

[0045] like Figure 8 and Fig. 9 As shown, the centrifugal rotating body 2 includes a ball head 10, a rotating blade 11, a stopper 12, a sleeve 13 and a torsion spring groove 14. The ball head 10 is fixed to the top of the rotating blade 11 to prevent the rotating blade 11 from damaging the pipe wall during the rotary dredging process; the sleeve 13 is fixed to the other end of the rotating blade 11 for connection with the drill bit; the torsion spring groove 14 is arranged on both sides of the sleeve 13 for installing and fixing the torsion spring; the stopper 12 is installed on both sides of the sleeve 13, outside the torsion spring groove 14, and plays a role in fixing the torsion spring and limiting the centrifugal rotating body 2. There are 4 centrifugal rotating bodies 2, which are rotatably installed on the rotating shaft 8 at the same circumferential distance.

[0046] The main drill bit 5 and the rotating blade 11 are specially designed to facilitate the retraction and expansion of the centrifugal rotating body 2, and are also conducive to drilling and desilting. The rotating blade 11 is streamlined in design, with a triangular front and decreasing thickness. The main drill bit 5 is structured as a whole with the tops (or tips) of four four-sided cones spliced ​​together. The head of the main drill bit 5 is pointed, and each cone has a blade. The rotating shaft 8 is arranged between the two blades, preferably in the middle of the two blades (such as Figure 7 As shown). The outermost end of each blade is fixedly connected to the corresponding support ring 6, there are 4 blades in total, and the number of support rings 6 is also 4.

[0047] The torsion spring is in a tightened state in the natural installation state, tightening the centrifugal rotating body 2; during the rotation process, due to the action of centrifugal force, the centrifugal rotating body 2 is expanded.

[0048] According to the different rotation speeds, the centrifugal force of the centrifugal rotating body 2 is different, the range of silt removal in the pipeline is different, and it can be applied to pipelines of different diameters.

[0049] Torsion spring torque design method:

[0050] The blade centrifugal drill bit is mainly affected by the gravity of the body, the torsion of the torsion spring and the centrifugal force during its rotation. The force analysis is as follows: Fig.10 As shown, as the rotation speed increases, the centrifugal force increases and the rotating body opens.

[0051] The centrifugal rotating body is subject to gravity G and centrifugal force F a and torsion spring torque F t In order for the centrifugal rotor 2 to unfold, it is necessary to ensure that the torque generated by the centrifugal force is greater than the sum of the torques generated by gravity and torsion, that is, F a × G >G×x G +F t ×r0.

[0052] In addition, in order to prevent the centrifugal rotor 2 from loosening when not rotating, it is necessary to require that the torque generated by the torsion spring torsion force is greater than the torque generated by the weight of the rotor, that is, F t ×r0>G×y G .

[0053] In the formula, x G ,y G represents the coordinates of the center of gravity of the rotating body, and r0 represents the distance from the torsion spring to the rotation axis.

[0054] Centrifugal force F a The calculation formula is as follows:

[0055] F a =m×w 2 ×

[0056] Where m represents the mass of the rotating body, w represents the rotation speed, and r represents the distance from the center of gravity to the rotation axis.

[0057] As an implementation method, for desilting a small pipe with an inner diameter of 38 mm, the centrifugal drill bit is designed to have a cone with a diameter of 15 mm and a length of 15 mm in the folded state. In the open state, it has a four-wing structure with a length of 15 mm and two wings of 37.7 mm. When rotating, it can desilt a diameter of 37.7 mm.

[0058] The rotating body and dimensions of the blade centrifugal drill are as follows: the part connected to the body is a ring with an inner diameter of 2.1mm and an outer diameter of 3mm, the rotating blade (blade) is a triangular cone with a length of 12mm and a width of 3mm, and the end is a sphere with a diameter of 1.3mm, and the simulated drill scratches the pipe wall. During the rotation of the blade centrifugal drill, it is mainly affected by the gravity of the body, the torsion of the torsion spring and the centrifugal force. As the speed increases, the centrifugal force increases and the rotating body opens.

[0059] The centrifugal rotating body is subject to gravity G, centrifugal force Fa and torsion spring torque Ft. In order for the rotating body to unfold, it is necessary to ensure that the torque generated by the centrifugal force is greater than the sum of the torques generated by gravity and torque, that is, F a × G >G×x G +F t ×r0.

[0060] In addition, in order to prevent the centrifugal rotating body from loosening when not rotating, it is necessary to require that the torque generated by the torsion spring torsion force is greater than the torque generated by the weight of the rotating body, that is, F t ×r0>G×y G .

[0061] In the formula, x G ,y G represents the coordinates of the center of gravity of the rotating body, and r0 represents the distance from the torsion spring to the rotation axis.

[0062] Centrifugal force F a : F a =m×w 2 ×

[0063] Where m represents the mass of the rotating body, w represents the rotation speed, and r represents the distance from the center of gravity to the rotation axis.

[0064] The rotating body material is cast iron which is easy to process and has high hardness. The rotating body mass m = 2.78*10 -4 kg, x G From 3.3mm when folded to 1mm when fully extended. G =3.3mm. r0=1mm, r=3.4mm. The torsion force of the torsion spring is designed to be equal to 5 times the gravity to ensure that the rotating body does not loosen when it is not rotating. It is calculated that when the rotating body is fully extended, the rotating body speed needs to be greater than 410r / min.

[0065] The blade-type small pipe dredging centrifugal drill bit provided by the present invention is connected with a flexible shaft to perform dredging operations on variable-diameter small pipes. First, the drill bit is connected to the flexible shaft through a connecting seat. Under the elastic force of a torsion spring, the blade-type centrifugal drill bit is in a tightened state with a small diameter, which is convenient for passing through small pipes and turning pipes. Under the push of an external force, the drill bit enters the interior of the pipe and reaches the blocked position. The flexible shaft rotates and the blade-type centrifugal drill bit starts to rotate under the action of centrifugal force. The external force continues to push forward, the flexible shaft rotates, and the blade-type centrifugal drill bit cuts the blockage to achieve dredging of small pipes.

[0066] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A blade-type small pipe dredging centrifugal drill bit, characterized in that: The drill bit comprises a drill body (1), a centrifugal rotating body (2), and a torsion spring. The centrifugal rotating body (2) is rotatably mounted on a rotating shaft (8) of the drill bit body (1). The torsion spring is mounted on the drill bit body (1) to provide a torsion force F. t The centrifugal rotating body (2) is retracted, and when the centrifugal drill bit rotates, the centrifugal rotating body (2) overcomes the torque F under the action of the centrifugal force. t open; The torque F t The following conditions are met: F a ×x G >G×x G +F t ×r0; F t ×r0>G×y G ; In the formula, G is the gravity of the centrifugal rotating body, F a is the centrifugal force, x G ,y G are the X-axis and Y-axis coordinates of the center of gravity of the rotating body, and r0 is the distance from the torsion spring to the rotation axis.

2. The blade-type small pipe desilting centrifugal drill bit according to claim 1, characterized in that: The drill bit body (1) comprises a main drill bit (5), a support ring (6), a retaining ring (7) and the rotating shaft (8); the support ring (6) is fixed to the bottom of the main drill bit (5); the rotating shaft (8) and the support ring (6) are arranged on the same annular surface with a spacing; the support ring (6) is fixed to the bottom blade of the main drill bit (5); the rotating shaft (8) is fixed between two sections of the support ring (6) and between two blades of the main drill bit (5); the retaining ring (7) is fixed to the support ring (6) and is used to limit the centrifugal rotating body (2).

3. The blade-type small pipe desilting centrifugal drill bit according to claim 2, characterized in that: A connecting seat (9) is provided at the bottom of the main drill bit (5) for connecting with the flexible shaft (4).

4. The blade-type small pipe desilting centrifugal drill bit according to claim 1, characterized in that: The support ring (6) is provided with a plurality of bearings (3) arranged at intervals.

5. The blade-type small pipe desilting centrifugal drill bit according to claim 1, characterized in that: The centrifugal rotating body (2) comprises a ball head (10), a rotating blade (11), a limiting block (12), a shaft sleeve (13) and a torsion spring groove (14); the ball head (10) is arranged at the top end of the rotating blade (11); the shaft sleeve (13) is arranged at the bottom end of the rotating blade (11); the torsion spring groove (14) is arranged on both sides of the shaft sleeve (13) for installing the torsion spring; the limiting block (12) is installed on both sides of the shaft sleeve (13) and is located outside the torsion spring groove (14) for fixing the torsion spring and limiting the centrifugal rotating body (2).

6. The blade-type small pipe desilting centrifugal drill bit according to claim 1 or 5, characterized in that: The number of the centrifugal rotating bodies (2) is 4, which are evenly spaced on the rotating shaft (8). When the centrifugal rotating bodies (2) are opened under the action of centrifugal force, as the rotation speed of the centrifugal drill bit increases, the opened diameter of the centrifugal rotating bodies (2) increases accordingly, so that the opened size of the centrifugal rotating bodies (2) can be controlled by controlling the rotation speed of the centrifugal drill bit, wherein the following formula is the relationship between the rotation speed and the opened diameter of the drill bit: D = 2Lsinα; Where w is the rotation speed, D is the drill diameter, k is the elastic coefficient of the torsion spring, α is the opening angle of the centrifugal rotor, m is the weight of the centrifugal rotor, g is the gravitational acceleration, and x is G is the X-axis coordinate of the center of gravity of the rotor, and L is the length of the centrifugal rotor.

7. The blade-type small pipe desilting centrifugal drill bit according to claim 5, characterized in that: The rotating blade (11) is a triangular pyramid with a length of 12 mm and a width of 3 mm, and the ball head (10) is a sphere with a diameter of 1.3 mm.

8. The blade-type small pipe desilting centrifugal drill bit according to claim 1, characterized in that: Centrifugal force F a The calculation formula is as follows: F a =m×w 2 ×r; Where m is the mass of the rotating body, w is the rotation speed, and r is the distance from the center of gravity to the axis of rotation.

9. The blade-type small pipe desilting centrifugal drill bit according to claim 1, characterized in that: The diameter of the centrifugal drill bit in the retracted state is 15mm and the length is 15mm.

10. The blade-type small pipe desilting centrifugal drill bit according to claim 1, characterized in that: x G When folded, it is 3.3mm, when fully expanded, it is 1mm, and the centrifugal drill bit speed is greater than 410r / min.

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