CN106088311B - Urban discharging pipeline dredging system - Google Patents

Abstract

The urban drainage pipeline dredging system includes a dredging drill bit; the rear end of the dredging drill bit is connected with the main connecting pipe in the same direction, and the rear end of the main connecting pipe is connected with the main water inlet pipe through a rotary sealer. The front end of the high-pressure hose extends into the dredging drill bit. The high-pressure hose is covered with a retaining ring. The outer ring of the retaining ring is provided with a circular installation groove along the circumferential direction. A pressure bearing is installed in the installation groove. The pressure bearing The outer ring of the dredging bit is in contact with the inner wall of the dredging bit; the rear part of the dredging bit is evenly provided with at least three forward water spray holes along the circumferential direction, and the front part of the dredge bit is evenly provided with at least three retreating water spray holes along the circumferential direction. The invention is novel in design, simple and compact in structure, easy to operate, fully reduces the labor intensity of operators, has a high degree of automation, can automatically advance and retreat, and can be used repeatedly, with good dredging effect, and is specially suitable for dredging of municipal pipelines.

Description

Urban drainage pipe dredging system

technical field

The invention belongs to the technical field of municipal engineering management and maintenance, and in particular relates to a system for dredging urban drainage pipes.

Background technique

Every summer, heavy rainfall occurs in many places in China, and urban waterlogging problems emerge one after another, directly endangering the safe operation of the city and people's lives, and also causing huge economic losses. There are many reasons for urban waterlogging, such as excessive rainfall, imperfect drainage systems, and damaged drainage pipes. Coupled with the increasing intensity of urban construction, the sand and soil required for the project are easily dropped and accumulated on the road during transportation, and flow into the sewage and rainwater drainage system with the road surface washing, resulting in an increase in the amount of silt in the pipeline and causing pipeline blockage. At the same time, it will also lead to poor drainage in rainy days, further aggravating urban waterlogging, affecting smooth traffic, and even causing traffic paralysis. How to effectively improve the drainage efficiency of urban drainage pipes, reduce pipe siltation or blockage, ensure smooth flow of pipes, and ensure safety during flood seasons are the most effective ways to solve urban waterlogging.

At present, the dredging vehicles of municipal engineering are generally used to dredge urban rainwater and sewage drainage pipes, but most of the operations on site still require manual operation, which not only has harsh working environment, high labor intensity, low work efficiency, but also consumes a lot of water resources. Dredge effect is not good.

Contents of the invention

In order to solve the deficiencies in the prior art, the present invention provides an urban drainage pipe dredging system with high degree of automation, high dredging efficiency, good dredging effect and water saving.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: the urban drainage pipe dredging system includes a dredging drill bit, the front part of the dredging drill bit has a conical structure, and the rear part of the dredging drill bit has a cylindrical structure. The outer peripheral surface of the cylindrical structure of the head is provided with spiral convex ribs, and the dredging drill bit is a hollow structure with an open rear end;

The rear end of the dredging drill bit is connected with the main connecting pipe in the same axial direction, and the rear end of the main connecting pipe is connected with the main water inlet pipe through the rotary sealer. The water inlet of the main water inlet pipe is provided with a main connecting flange, and the main water inlet pipe is provided with a main control valve. , the main connecting pipe and the main water inlet pipe are provided with a high-pressure hose, the front end of the high-pressure hose extends into the dredging drill bit, the high-pressure hose is covered with a retaining ring, and the high-pressure hose is provided with front valves located on the front and rear sides of the retaining ring. The limit ring and the rear limit ring, the front limit ring is fixed on the front end of the high-pressure hose, the outer ring of the retaining ring is provided with a circular installation groove along the circumferential direction, and a pressure bearing is installed in the installation groove, and the outer surface of the pressure bearing The ring is in contact with the inner wall of the dredging drill bit; the rear end of the high-pressure hose is connected with an auxiliary water supply pipe, the auxiliary water supply pipe is perpendicular to the high-pressure hose, the auxiliary water supply pipe passes through the main water inlet pipe and is provided with an auxiliary water inlet sealing ring between the main water inlet pipe, The auxiliary water supply pipe is provided with an auxiliary control valve, and the water inlet of the auxiliary water supply pipe is provided with an auxiliary connecting flange;

The rear part of the dredging drill bit is evenly provided with at least three forward water spray holes along the circumferential direction, and the front part of the dredge drill bit is evenly provided with at least three retreat water spray holes along the circumferential direction. The width of the outer ring of the bearing, the inner port of the forward water spray hole is located on the front side of the outer port of the forward water spray hole, the center line of the forward water spray hole deviates from the center line of the dredging drill bit; the inner port of the backward water spray hole is located On the rear side of the outer port of the hole, the center line of the retreating water spray hole deviates from the center line of the dredging drill bit, and the center line of the forward water spray hole and the center line of the retreating water spray hole are 40-50° from the center line of the dredging drill bit. Angle;

The rotary seal includes a front sleeve and a rear sleeve coaxially arranged, the front sleeve is set outside the main connecting pipe, the rear part of the front sleeve is threaded with the front part of the rear sleeve, and the front end of the front sleeve is provided with a front ring Baffle, the middle part of the inner wall of the front sleeve is provided with a middle annular baffle, the front end of the inner wall of the rear sleeve is provided with a rear annular baffle, and the rear end of the inner wall of the rear annular baffle is provided with a compression ring;

The rear end of the outer wall of the main connecting pipe is provided with an annular concave step, and the rear part of the outer wall of the main connecting pipe is provided with a positioning ring plate corresponding to the front part of the middle annular baffle. The front side of the ring plate and the outer wall of the main connecting pipe are enclosed to form a bearing chamber. Deep groove ball bearings are installed in the bearing chamber. The inner ring of the deep groove ball bearing is in interference fit with the outer wall of the main connecting pipe. The inner wall of the barrel is interference fit, and the front annular baffle is provided with an oil injection hole communicating with the bearing chamber.

There is a front seal ring between the inner wall of the rear part of the middle annular baffle, the rear side of the positioning ring plate, the front side of the rear annular baffle and the outer wall of the main connecting pipe. The rear sealing ring between the inner walls, the front end of the main water inlet pipe extends into the rear sleeve and is threadedly connected with the rear sleeve, and the main water inlet sealing ring is arranged between the outer wall of the main water inlet pipe and the rear inner wall of the rear sleeve.

The dredging drill bit includes a drill body and a connecting sleeve. The front end of the connecting sleeve is inserted into the rear of the drill body and fixedly connected by the front screw; the inner diameter of the front part of the connecting sleeve is equal to the inner diameter of the rear part of the drill body, and the inner diameter of the rear part of the connecting sleeve is smaller than that of the connecting sleeve. The inner diameter of the front part; the front part of the main connecting pipe is inserted in the rear part of the connecting sleeve and fixedly connected by the rear screw;

The forward water spray hole and the spiral rib are all arranged on the drill bit body, and the retreat water spray hole is arranged on the front part of the connecting sleeve.

The retaining ring is provided with front and rear transparent water pressure balance holes.

With the above technical scheme, the main connecting flange on the main water inlet pipe and the auxiliary connecting flange on the auxiliary water supply pipe are both connected to a high-pressure water source (the high-pressure water source can be a dredging vehicle commonly used in municipal engineering), and the present invention is placed in the drainage pipe Open the main control valve, the high-pressure water enters the main connecting pipe and the dredging bit from the main water inlet pipe, and the high-pressure water drives the retaining ring, pressure bearing and high-pressure hose to move forward, and the conical structure at the front of the dredging bit is limited The position where the pressure bearing moves forward. At this time, the outer ring of the pressure bearing blocks the retreat water spray hole. At the same time, high-pressure water is sprayed backward from the forward water spray hole. Since the center line of the forward water spray hole deviates from the center of the dredging drill bit Line, that is, due to the eccentric arrangement of the forward spray holes, under the action of high-pressure water injection, the impulse generated by the injection makes the dredging drill bit rotate, and the axial direction produces a forward force. The convex ribs also rotate with the dredging bit to generate a helical thrust to the dredging bit. When the helical thrust and the water flow act together, the dredging bit is driven to rotate and move forward at the same time, thereby dredging the blockage in the drainage pipe, and the high-pressure water also clears the blockage. Things play a good role in dredging.

Because the drainage pipe is relatively long, it is difficult to exit directly after the dredging drill bit is screwed in. At this time, close the main control valve and open the auxiliary control valve. The high-pressure water enters the high-pressure hose from the auxiliary water supply pipe, and finally enters the dredging bit. The retaining ring and the pressure bearing move backward to make the high-pressure hose bend, and the rear part of the connecting sleeve limits the position of the pressure bearing to move backward. At this time, the outer ring of the pressure bearing blocks the forward water spray hole, and at the same time, the high-pressure water moves backward The water spray hole is sprayed backwards. Since the center line of the retreat water spray hole deviates from the center line of the dredging drill bit, that is, due to the eccentric arrangement of the retreat water spray hole, under the action of high-pressure water spray, the impulse generated by the spray makes the dredge drill bit rotate, and the shaft Since the dredging bit is provided with a spiral convex rib, the convex rib also produces a spiral thrust to the dredging bit as the dredging bit rotates, and the screw thrust and the water flow work together to push the dredging bit to rotate. Simultaneously, it also moves backwards, so that the dredge bit is withdrawn from the drain pipe.

Due to the setting of the rotary sealer, the dredging bit drives the main connecting pipe to rotate when it rotates, and the main water inlet pipe, front sleeve and rear sleeve are all fixed. As the dredging bit advances or retreats, the deep groove ball in the rotary sealer The bearing plays the role of good rotation of the main connecting pipe, and the front sealing ring, the rear sealing ring and the main water inlet sealing ring play the role of preventing water leakage. The front limit ring and the rear limit ring set on the high-pressure hose can fix the retaining ring on the high-pressure hose to prevent the retaining ring and pressure bearing from detaching from the high-pressure hose under the action of high-pressure water. The back and forth movement of the retaining ring and pressure bearing can stretch or bend.

The water pressure balance hole is set on the retaining ring, and the high-pressure water can pass through the water pressure balancing hole to keep the pressure on the front and rear sides of the retaining ring and the pressure bearing in balance, so as to avoid excessive water pressure from causing huge axial force on the retaining ring and the pressure bearing. Disengage the pressure bearing from the retaining ring or disengage the outer ring of the pressure bearing from the inner ring.

The dredging drill bit is composed of a drill body and a connecting sleeve, which is not only convenient for manufacturing, but also convenient for installation, and is easy to assemble and connect between the connecting sleeve and the main connecting pipe.

The setting structure of the forward water spray hole and the backward water spray hole (the center line is set eccentrically, the inner port of the forward water spray hole is located on the front side of the outer port of the forward water spray hole, and the inner port of the backward water spray hole is located The rear side of the outer port, the center line of the forward water spray hole and the center line of the retreat water spray hole are at an angle of 40-50° with the center line of the dredging drill bit), so that the high pressure water can drive the dredging bit to rotate fully at the same time Reduce drag.

In summary, the present invention is novel in design, simple and compact in structure, easy to operate, fully reduces the labor intensity of operators, has a high degree of automation, can automatically advance and retreat, and can be used repeatedly, and has a good dredging effect. It is specially suitable for municipal Pipeline dredging work.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is A-A sectional view among Fig. 1;

Fig. 3 is a schematic structural view of the rotary sealer in Fig. 1 .

Detailed ways

As shown in Fig. 1, Fig. 2 and Fig. 3, the urban drainage pipe dredging system of the present invention comprises a dredging drill bit. The outer peripheral surface of the cylindrical structure at the rear of the drill bit is provided with a helical convex rib 1, and the dredging drill bit is a hollow structure with an open rear end.

The rear end of the dredging drill bit is connected with the main connecting pipe 2 coaxially, the rear end of the main connecting pipe 2 is connected with the main water inlet pipe 4 through the rotary sealer 3, the water inlet of the main water inlet pipe 4 is provided with a main connecting flange 5, and the main water inlet pipe 4 is provided with a main control valve 6, and the main connecting pipe 2 and the main water inlet pipe 4 are provided with a high-pressure hose 7. The high-pressure hose 7 is provided with a front limit ring 9 and a rear limit ring 8 on the front and rear sides of the retaining ring 10. The front limit ring 9 is fixed on the front end of the high-pressure hose 7, and the outer ring of the retaining ring 10 is along the circumferential direction. An annular installation groove is provided, and a pressure bearing 11 is installed in the installation groove. The outer ring of the pressure bearing 11 is in contact with the inner wall of the dredging drill bit; the rear end of the high-pressure hose 7 is connected with an auxiliary water supply pipe 12, and the auxiliary water supply pipe 12 is perpendicular to the high pressure The hose 7 and the auxiliary water supply pipe 12 pass through the main water inlet pipe 4 and are provided with an auxiliary water inlet sealing ring 13 between the main water inlet pipe 4, and the auxiliary water supply pipe 12 is provided with an auxiliary control valve 14, and the water inlet of the auxiliary water supply pipe 12 An auxiliary connecting flange 15 is provided.

The rear part of the dredging drill bit is evenly provided with at least three forward water spray holes 16 along the circumferential direction, and the front part of the dredge drill bit is evenly provided with at least three retreating water spray holes 17 along the circumferential direction. Aperture is all less than the width of pressure bearing 11 outer rings, and the inner port of advancing water spray hole 16 is positioned at the front side of the outer port of advancing water spray hole 16, and the center line of advancing water spray hole 16 deviates from the center line of dredging drill bit; The inner port of hole 17 is positioned at the rear side of the outer port of retreat water spray hole 17, and the center line of retreat water spray hole 17 deviates from the center line of dredging drill bit, the center line of advance water spray hole 16 and the center line of retreat water spray hole 17 They all form an included angle of 40-50° with the center line of the dredging drill bit.

The rotary sealer 3 includes a front sleeve 18 and a rear sleeve 19 arranged coaxially, the front sleeve 18 is sleeved outside the main connecting pipe 2, the rear part of the front sleeve 18 is threadedly connected with the front part of the rear sleeve 19, and the front The front end of the sleeve 18 is provided with a front annular baffle 20, the middle part of the inner wall of the front sleeve 18 is provided with a middle annular baffle 21, the front end of the rear sleeve 19 inner wall is provided with a rear annular baffle 22, and the inner wall of the rear annular baffle 22 A compression ring 23 is provided at the rear end.

The rear end of the outer wall of the main connecting pipe 2 is provided with an annular concave step. The front side of the plate 21, the front side of the positioning ring plate 24 and the outer wall of the main connecting pipe 2 are enclosed to form a bearing room. The deep groove ball bearing 25 is installed in the bearing room, and the inner ring of the deep groove ball bearing 25 interferes with the outer wall of the main connecting pipe 2. Cooperate, the outer ring of the deep groove ball bearing 25 is in interference fit with the inner wall of the front sleeve 18, and the front annular baffle 20 is provided with an oil injection hole 26 communicating with the bearing chamber.

A front sealing ring 27 is provided between the inner wall of the rear part of the middle annular baffle 21, the rear side of the positioning ring plate 24, the front side of the rear annular baffle 22, and the outer wall of the main connecting pipe 2, and a front sealing ring 27 is provided at the annular concave step at the front of the compression ring 23. The rear sealing ring 28 between the side and the inner wall of the rear annular baffle plate 22, the front end of the main water inlet pipe 4 extends into the rear sleeve 19 and is threaded with the rear sleeve 19, the outer wall of the main water inlet pipe 4 is connected to the rear sleeve 19 rear portion A main water inlet sealing ring 29 is arranged between the inner walls.

The dredging drill bit includes a drill body 30 and a connecting sleeve 31. The front end of the connecting sleeve 31 is inserted in the rear portion of the drill body 30 and is fixedly connected by the front screw 32; The inner diameter of the 31 rear part is smaller than the inner diameter of the connecting sleeve 31 front; the main connecting pipe 2 front is inserted in the connecting sleeve 31 rear and fixedly connected by the rear screw 33; the forward water spray hole 16 and the spiral rib 1 are all It is arranged on the drill body 30 , and the retreat water spray hole 17 is arranged on the front part of the connection sleeve 31 .

The retaining ring 10 is provided with a water pressure balance hole 34 which is transparent from front to back.

The working process of the present invention is as follows: the main connecting flange 5 on the main water inlet pipe 4 and the auxiliary connecting flange 15 on the auxiliary water supply pipe 12 are all connected to a high-pressure water source (the high-pressure water source can adopt a dredging vehicle commonly used in municipal engineering), and the The present invention is placed in the blockage of the drainage pipe, the main control valve 6 is opened, the high-pressure water enters the main connecting pipe 2 and the dredging drill bit from the main water inlet pipe 4, and the high-pressure water drives the retaining ring 10, the pressure bearing 11 and the high-pressure hose 7 directions Moving forward, the conical structure at the front of the dredge drill bit limits the position where the pressure bearing 11 moves forward. At this time, the outer ring of the pressure bearing 11 blocks the retreat water spray hole 17. At the same time, the high-pressure water flows backward from the forward water spray hole 16. Ejection, because the center line of the advancing water spray hole 16 deviates from the center line of the dredging drill bit, that is, due to the eccentric arrangement of the advancing water spray hole 16, under the injection effect of high-pressure water, the impulse generated by the injection makes the dredging drill bit rotate, and the axial direction is generated. The previous force, because the dredging bit is provided with a spiral convex rib 1, the convex rib 1 also produces a helical thrust to the dredging bit as the dredging bit rotates, and the helical thrust and the water flow work together to push the dredging bit to rotate It also moves forward to clear the blockage in the drainage pipe, and the high-pressure water also plays a good role in clearing the blockage.

Due to the relatively long drainage pipe, it is difficult to exit directly after the dredging drill bit is screwed in. At this time, the main control valve 6 is closed and the auxiliary control valve 14 is opened. The high-pressure water enters the high-pressure hose 7 from the auxiliary water supply pipe 12, and finally enters the dredging drill bit. , the high-pressure water drives the retaining ring 10 and the pressure bearing 11 to move backward, so that the high-pressure hose 7 is bent, and the rear part of the connecting sleeve 31 limits the backward movement position of the pressure bearing 11. At this time, the outer ring of the pressure bearing 11 sprays water forward. Hole 16 is blocked, and simultaneously, high-pressure water sprays backward in the water spray hole 17 from retreating, because the center line of retreating water spray hole 17 deviates from the center line of dredging drill bit, namely because retreating water spray hole 17 eccentric arrangements, in the high pressure water Under the action of the jet, the impulse generated by the jet makes the dredging bit rotate, and the axial force produces a backward force. Since the dredging bit is provided with a helical rib 1, the rib 1 also produces a force on the dredging bit as the dredging bit rotates. The helical thrust, when the helical thrust and the water flow act together, promotes the dredging drill bit to rotate and also moves backward, so that the dredging drill bit is withdrawn from the drainage pipe.

Due to the setting of the rotary sealer 3, the dredging drill bit drives the main connecting pipe 2 to rotate when it rotates, and the main water inlet pipe 4, the front sleeve 18 and the rear sleeve 19 are all fixed, and as the dredging drill bit advances or retreats, the rotary sealer The deep groove ball bearing 25 in 3 plays the effect of good rotation of the main connecting pipe 2, and the front sealing ring 27, the rear sealing ring 28 and the main water inlet sealing ring 29 play the effect of avoiding water leakage. The front limit ring 9 and the rear limit ring 8 provided on the high-pressure hose 7 can fix the retaining ring 10 on the high-pressure hose 7, so as to prevent the retaining ring 10 and the pressure bearing 11 from breaking away from the high-pressure hose under the action of high-pressure water. The pipe 7 and the high-pressure hose 7 can be stretched or bent as the retaining ring 10 and the pressure bearing 11 move back and forth.

The water pressure balance hole 34 provided on the retaining ring 10, high-pressure water can pass through the hydraulic pressure balancing hole 34 to keep the pressure on both sides of the retaining ring 10 and the pressure bearing 11 in balance, so as to avoid excessive water pressure on the retaining ring 10 and the pressure bearing 11 Huge axial force is generated to disengage the pressure bearing 11 from the retaining ring 10 or to disengage the outer ring and the inner ring of the pressure bearing 11 .

The dredging drill bit is made up of a drill body 30 and a connecting sleeve 31, which is not only convenient for manufacturing, but also convenient for installation, and is easy to assemble and connect between the connecting sleeve 31 and the main connecting pipe 2.

The setting structure of the forward water spray hole 16 and the retreat water spray hole 17 (the center line is eccentrically arranged, as shown in Fig. 1. The inner port of the retreat water spray hole 17 is positioned at the rear side of the outer port of the retreat water spray hole 17, and the center line of the forward water spray hole 16 and the center line of the retreat water spray hole 17 are 40-50° with the center line of the dredging drill bit. °, preferably 44°), so that the high-pressure water can drive the dredging drill bit to rotate while fully reducing the resistance.

This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the present invention. All simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention belong to the protection of the technical solution of the present invention. scope.

Claims (3)

1. The dredging system of urban drainage pipes is characterized in that: it includes a dredging drill bit, the front part of the dredging drill bit is a conical structure, the rear part of the dredging drill bit is a cylindrical structure, and the outer circumference of the cylindrical structure of the dredging drill bit is The surface is provided with spiral convex ribs, and the dredging drill bit is hollow and the rear end is open; The rear end of the dredging drill bit is connected with the main connecting pipe in the same axial direction, and the rear end of the main connecting pipe is connected with the main water inlet pipe through the rotary sealer. The water inlet of the main water inlet pipe is provided with a main connecting flange, and the main water inlet pipe is provided with a main control valve. , the main connecting pipe and the main water inlet pipe are provided with a high-pressure hose, the front end of the high-pressure hose extends into the dredging drill bit, the high-pressure hose is covered with a retaining ring, and the high-pressure hose is provided with front valves located on the front and rear sides of the retaining ring. The limit ring and the rear limit ring, the front limit ring is fixed on the front end of the high-pressure hose, the outer ring of the retaining ring is provided with a circular installation groove along the circumferential direction, and a pressure bearing is installed in the installation groove, and the outer surface of the pressure bearing The ring is in contact with the inner wall of the dredging drill bit; the rear end of the high-pressure hose is connected with an auxiliary water supply pipe, the auxiliary water supply pipe is perpendicular to the high-pressure hose, the auxiliary water supply pipe passes through the main water inlet pipe and is provided with an auxiliary water inlet sealing ring between the main water inlet pipe, The auxiliary water supply pipe is provided with an auxiliary control valve, and the water inlet of the auxiliary water supply pipe is provided with an auxiliary connecting flange; The rear part of the dredging drill bit is evenly provided with at least three forward water spray holes along the circumferential direction, and the front part of the dredge drill bit is evenly provided with at least three retreat water spray holes along the circumferential direction. The width of the outer ring of the bearing, the inner port of the forward water spray hole is located on the front side of the outer port of the forward water spray hole, the center line of the forward water spray hole deviates from the center line of the dredging drill bit; the inner port of the backward water spray hole is located On the rear side of the outer port of the hole, the center line of the retreating water spray hole deviates from the center line of the dredging drill bit, and the center line of the forward water spray hole and the center line of the retreating water spray hole are at an angle of 44° to the center line of the dredging drill bit ; The rotary seal includes a front sleeve and a rear sleeve coaxially arranged, the front sleeve is set outside the main connecting pipe, the rear part of the front sleeve is threaded with the front part of the rear sleeve, and the front end of the front sleeve is provided with a front ring Baffle, the middle part of the inner wall of the front sleeve is provided with a middle annular baffle, the front end of the inner wall of the rear sleeve is provided with a rear annular baffle, and the rear end of the inner wall of the rear annular baffle is provided with a compression ring; The rear end of the outer wall of the main connecting pipe is provided with an annular concave step, and the rear part of the outer wall of the main connecting pipe is provided with a positioning ring plate corresponding to the front part of the middle annular baffle. The front side of the ring plate and the outer wall of the main connecting pipe are enclosed to form a bearing chamber. Deep groove ball bearings are installed in the bearing chamber. The inner ring of the deep groove ball bearing is in interference fit with the outer wall of the main connecting pipe. The inner wall of the barrel is interference fit, and the front annular baffle is provided with an oil injection hole communicating with the bearing chamber. There is a front seal ring between the inner wall of the rear part of the middle annular baffle, the rear side of the positioning ring plate, the front side of the rear annular baffle and the outer wall of the main connecting pipe. The rear sealing ring between the inner walls, the front end of the main water inlet pipe extends into the rear sleeve and is threadedly connected with the rear sleeve, and the main water inlet sealing ring is arranged between the outer wall of the main water inlet pipe and the rear inner wall of the rear sleeve. 2. The urban drainage pipe dredging system according to claim 1, characterized in that: the dredging drill bit comprises a drill body and a connecting sleeve, the front end of the connecting sleeve is inserted in the rear part of the drill body and is fixedly connected by a front screw; The inner diameter is equal to the inner diameter of the rear part of the drill body, and the inner diameter of the rear part of the connecting sleeve is smaller than the inner diameter of the front part of the connecting sleeve; the front part of the main connecting pipe is inserted in the rear part of the connecting sleeve and fixedly connected by the rear screw; The forward water spray hole and the spiral rib are all arranged on the drill bit body, and the retreat water spray hole is arranged on the front part of the connecting sleeve. 3. The urban drainage pipe dredging system according to claim 1 or 2, characterized in that: the retaining ring is provided with water pressure balance holes that are transparent from front to back.