Front end sealing structure of tube push bench driving box

Abstract

The utility model discloses a front end sealing structure of a tube push bench driving box. The front end sealing structure of the tube push bench driving box comprises a main shaft, the outer side of the main shaft is sleeved with a sealing seat, a plurality of first annular grooves and second annular grooves are formed in the inner circumferential face of the sealing seat, first sealing rings connected to the outer circumferential face of the main shaft in a sleeving mode are arranged in the first annular grooves, and second sealing rings connected to the outer circumferential face of the main shaft in a sleeving mode are arranged in the second annular grooves. A third annular groove is further formed in the inner circumferential face of the sealing seat, an air bag sealing ring is arranged in the third annular groove, a main body of the air bag sealing ring is connected to the outer side of the main shaft in a sleeving mode, and an air nozzle of the air bag sealing ring extends to the outer side of the sealing seat through the side wall of the third annular groove. The pipe jacking machine solves the problem that the long-distance construction requirement of the pipe jacking machine cannot be met in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of underground engineering, in particular to a front end sealing structure of a pipe jacking machine drive box. Background Art

[0002] The existing Chinese utility model patent with publication number CN220060440U, entitled "A Main Drive Reducer for an Externally Mounted Pipe Jacking Machine." The specification states that a first sealing ring and a second sealing ring are provided inside the driving body, and the main shaft is inserted into the first and second sealing rings, and the first and second sealing rings are used to dynamically seal the main shaft. However, this structure can only meet the short-distance construction requirements of the pipe jacking machine. When the distance from the starting well to the exit well exceeds 1,000 meters, the first and second sealing rings are extremely susceptible to wear and failure. At this time, the pipe jacking machine is underground, and the first and second sealing rings cannot be replaced, resulting in the pipe jacking machine being paralyzed. Utility Model Content

[0003] The purpose of the utility model is to address the deficiencies in the prior art and to provide a front end sealing structure for a pipe jacking machine drive box which can meet the long-distance construction requirements of the pipe jacking machine.

[0004] In order to achieve the above purpose, the technical solution adopted by the front end sealing structure of the driving box of the pipe jacking machine of the present invention is:

[0005] A front end sealing structure of a pipe jacking machine drive box includes a main shaft, a sealing seat is sleeved on the outer side of the main shaft, a plurality of first annular grooves and second annular grooves are provided on the inner circumference of the sealing seat, a first sealing ring sleeved on the outer circumference of the main shaft is provided in the first annular groove, a second sealing ring sleeved on the outer circumference of the main shaft is provided in the second annular groove, a third annular groove is further provided on the inner circumference of the sealing seat, an airbag sealing ring is provided in the third annular groove, the main body of the airbag sealing ring is sleeved on the outer side of the main shaft, and the air nozzle of the airbag sealing ring extends to the outside of the sealing seat through the side wall of the third annular groove.

[0006] Preferably, the main cross-section of the airbag sealing ring is circular, rectangular, square, trapezoidal or D-shaped.

[0007] Preferably, the sealing seat is provided with an oil filling hole leading to the main shaft.

[0008] Preferably, the first sealing ring is a rotating sealing ring, and the second sealing ring is a toothed sealing ring.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] During the long-distance construction process of the pipe jacking machine, when abnormal pressure is detected in the sealing seat, it means that the first and second sealing rings are severely worn. At this time, the airbag sealing ring is inflated to prevent external mud and sand from entering the drive box, ensuring that the pipe jacking machine can continue construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the front end sealing structure of the driving box of the pipe jacking machine of the present invention;

[0012] Figure 2 This is a diagram of the airbag sealing ring entering operation.

[0013] Among them, 1 is the main shaft, 2 is the sealing seat, 21 is the oil filling hole, 22 is the first annular groove, 23 is the second annular groove, 24 is the third annular groove, 3 is the first sealing ring, 4 is the second sealing ring, and 5 is the airbag sealing ring. DETAILED DESCRIPTION

[0014] The present invention is further illustrated below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0015] like Figure 1-2 As shown, a front end sealing structure of a pipe jacking machine drive box includes a main shaft 1, a sealing seat 2 is sleeved on the outer side of the main shaft, an oil filling hole 21 leading to the main shaft is opened in the middle of the sealing seat, two first annular grooves 22 and two second annular grooves 23 are opened in sequence on the inner circumference of the sealing seat located in front of the oil filling hole, a first annular groove and a third annular groove 24 are opened in sequence on the inner circumference of the sealing seat located on the rear side of the oil filling hole, a first sealing ring 3 sleeved on the outer circumference of the main shaft is embedded in the first annular groove, the first sealing ring is a rotating sealing ring, the second sealing ring 4 sleeved on the outer circumference of the main shaft is embedded in the second annular groove, the second sealing ring is a toothed sealing ring, the airbag sealing ring 5 is embedded in the third annular groove, the main body of the airbag sealing ring is sleeved on the outside of the main shaft, the main cross-section of the airbag sealing ring is D-shaped, and the air nozzle of the airbag sealing ring extends to the outside of the sealing seat through the side wall of the third annular groove.

[0016] The specific working process and principle of the front-end sealing structure of a pipe jacking machine drive box: When the pipe jacking machine is in normal construction, the airbag sealing ring is in a deflated state. At this time, the first and second sealing rings prevent mud and sand from entering the drive box. When the pipe jacking machine enters the later stage of long-distance continuous construction, abnormal pressure in the sealing seat is detected, and the airbag sealing ring is immediately inflated. The full airbag sealing ring replaces the first and second sealing rings to prevent mud and sand from entering the drive box, ensuring that the pipe jacking machine completes the remaining construction. The utility model solves the problem of not being able to replace the first and second sealing rings in time underground by arranging the airbag sealing ring in the sealing seat as an emergency measure, reducing construction risks and improving the continuous and long-distance construction capabilities of the pipe jacking machine.

Claims

1. A front end sealing structure of a pipe jacking machine drive box, characterized in that: It includes a main shaft, a sealing seat is sleeved on the outer side of the main shaft, an oil filling hole leading to the main shaft is opened in the middle of the sealing seat, two first annular grooves and two second annular grooves are opened in sequence on the inner circumference of the sealing seat located in front of the oil filling hole, a first annular groove and a third annular groove are opened in sequence on the inner circumference of the sealing seat located on the rear side of the oil filling hole, a first sealing ring sleeved on the outer circumference of the main shaft is embedded in the first annular groove, the first sealing ring is a rotating sealing ring, the second sealing ring sleeved on the outer circumference of the main shaft is embedded in the second annular groove, the second sealing ring is a toothed sealing ring, the airbag sealing ring is embedded in the third annular groove, the main body of the airbag sealing ring is sleeved on the outer side of the main shaft, the main cross-section of the airbag sealing ring is D-shaped, and the air nozzle of the airbag sealing ring extends to the outside of the sealing seat through the side wall of the third annular groove.

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