Jumping and oil leakage preventing structure for tail of driving box

Abstract

The utility model discloses a jumping and oil leakage preventing structure at the tail of a driving box. The structure comprises a driving box body, a driving main shaft penetrates through the driving box body, the outer side of the driving main shaft is sleeved with a sealing seat, the inner circumferential face of the sealing seat is provided with a framework oil seal connected to the outer circumferential face of the driving main shaft in a sleeving mode, and the outer side of the sealing seat is provided with an annular rubber plate; the inner side edge of the annular rubber plate is fixedly connected with the sealing seat through a plurality of first bolts, and the outer side edge of the annular rubber plate is arranged on the end face of the tail of the driving box through a plurality of second bolts. The utility model solves the problems that the sealing performance of the tail part of the driving box is reduced and the oil leakage phenomenon occurs when the driving main shaft jumps.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe jacking machines, in particular to an anti-jumping oil leakage structure at the tail of a drive box. Background Art

[0002] At present, at the tail of the drive box of a pipe jacking machine, a rigid gland is sleeved outside the drive main shaft, and a skeleton oil seal is installed on the inner peripheral surface of the gland to prevent oil leakage. However, during the jacking process of the pipe jacking machine, when encountering a complex formation with high rock strength, the drive main shaft will jump due to excessive radial force. At this time, the skeleton oil seal is unevenly stressed and has a gap with the drive main shaft, resulting in a decrease in sealing performance and oil leakage. Content of the Utility Model

[0003] The purpose of the utility model is to provide an anti-jumping oil leakage structure at the tail of a drive box that can always maintain good sealing performance and avoid oil leakage at the tail of the drive box of a pipe jacking machine in view of the deficiencies of the existing technology.

[0004] To achieve the above purpose, the technical solution adopted by the anti-jumping oil leakage structure at the tail of the drive box of the utility model is as follows:

[0005] An anti-jumping oil leakage structure at the tail of a drive box includes a drive box body, a drive main shaft passing through the drive box body, a sealing seat sleeved outside the drive main shaft, a skeleton oil seal sleeved on the outer peripheral surface of the drive main shaft on the inner peripheral surface of the sealing seat, an annular rubber plate arranged outside the sealing seat, the inner edge of the annular rubber plate is fixedly connected to the sealing seat through a plurality of first bolts, and the outer edge of the annular rubber plate is connected to the end face of the tail of the drive box body through a plurality of second bolts.

[0006] Preferably, an inner pressure ring is arranged between the inner edge of the annular rubber plate and the head of the first bolt, and an outer pressure ring is arranged between the outer edge of the annular rubber plate and the head of the second bolt. The inner and outer pressure rings ensure uniform pressure on the inner and outer edges of the annular rubber plate to ensure the sealing performance between the annular rubber plate and the drive box body and between the annular rubber plate and the sealing seat.

[0007] Preferably, a wear-resistant ring sleeved on the outer peripheral surface of the drive main shaft is arranged on the inner peripheral surface of the sealing seat. The wear-resistant sleeve protects the sealing seat from wear and improves the service life of the sealing seat.

[0008] Preferably, a positioning groove for sleeving the annular rubber plate is formed on the outer peripheral surface of one side of the sealing seat. The positioning groove facilitates the assembly of the sealing seat and the annular rubber plate.

[0009] Preferably, the annular rubber plate is made of a rubber plate with steel wires inside. The steel wires can make the rubber plate have flexibility while having a certain strength.

[0010] Compared with the existing technology, the utility model has the following advantages:

[0011] When the driving main shaft has a runout, the annular rubber plate deforms accordingly, keeping the periphery of the skeleton oil seal in good contact with the driving main shaft, thereby ensuring its sealing performance and preventing oil leakage at the tail of the drive box of the pipe jacking machine. Description of the Drawings

[0012] Figure 1 is a schematic diagram of the anti-runout oil leakage structure at the tail of the drive box of the present utility model;

[0013] Figure 2 is Figure 1 an enlarged view of part C of

[0014] Figure 3 is a cross-sectional view of the sealing seat.

[0015] Wherein, 1 is the drive box body, 2 is the driving main shaft, 3 is the sealing seat, 31 is the first groove, 32 is the second groove, 33 is the skeleton oil seal, 34 is the wear-resistant ring, 35 is the positioning groove, 4 is the annular rubber plate, 5 is the first bolt, 6 is the inner pressure ring, 7 is the second bolt, and 8 is the outer pressure ring. Detailed Embodiment

[0016] The present utility model will be further clarified below in conjunction with the drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present utility model and not to limit the scope of the present utility model. After reading the present utility model, various equivalent modifications made by those skilled in the art to the present utility model all fall within the scope defined by the appended claims of this application.

[0017] Such as Figures 1-3As shown in the figure, an anti-jump oil leakage structure at the tail of a drive box includes a drive box body 1. The drive box body penetrates through a drive main shaft 2. A sealing seat 3 is sleeved outside the drive main shaft. A first groove 31 and a second groove 32 are successively formed on the inner peripheral surface of the sealing seat from left to right. A skeleton oil seal 33 sleeved on the outer peripheral surface of the drive main shaft is installed in the first groove. A wear-resistant ring 34 sleeved on the outer peripheral surface of the drive main shaft is installed in the second groove. A wear-resistant sleeve separates the drive main shaft from the sealing seat, protecting the sealing seat from wear and increasing the service life of the sealing seat. A positioning groove 35 is formed on the outer peripheral surface on the right side of the sealing seat. An annular rubber plate 4 is installed in the positioning groove. The positioning groove facilitates the assembly of the sealing seat and the annular rubber plate. The annular rubber plate is made of a rubber plate with steel wires inside. The steel wires can endow the rubber plate with flexibility while having a certain strength. The inner edge of the annular rubber plate is fixedly connected to the sealing seat through a plurality of first bolts 5. An inner pressure ring 6 is arranged between the inner edge of the annular rubber plate and the head of the first bolt. The first bolt sequentially passes through the inner pressure ring and the annular rubber plate and then is threadedly connected to the sealing seat. The outer edge of the annular rubber plate is fixedly connected to the tail of the drive box body through a plurality of second bolts 7. An outer pressure ring 8 is arranged between the outer edge of the annular rubber plate and the head of the second bolt. The second bolt sequentially passes through the outer pressure ring and the annular rubber plate and then is threadedly connected to the tail of the drive box body. The inner and outer pressure rings ensure uniform pressure on the inner and outer edges of the annular rubber plate to ensure the sealing performance between the annular rubber plate and the drive box body and between the annular rubber plate and the sealing seat.

[0018] The specific working process and principle of an anti-jump oil leakage structure at the tail of a drive box: During normal operation, the drive main shaft rotates normally, and the skeleton oil seal sleeved on the outer peripheral surface of the drive main shaft prevents oil leakage. When the drive main shaft jumps due to excessive radial force during operation, the drive main shaft transmits the force to the flexible annular rubber plate through the wear-resistant ring and the sealing seat. The annular rubber plate deforms to drive the synchronous movement of the sealing seat, the wear-resistant ring, and the skeleton oil seal with the drive main shaft. The circumference of the skeleton oil seal is in good contact with the outer peripheral surface of the drive main shaft, and can always maintain good sealing performance, avoiding oil leakage at the tail of the drive box of the pipe jacking machine.

Claims

1. An anti-jumping and oil-leakage structure at the tail of a drive box, comprising a drive box body, and a drive main shaft penetrating through the drive box body, characterized in that: A seal seat is sleeved on the outside of the driving main shaft. A skeleton oil seal sleeved on the outer peripheral surface of the driving main shaft is arranged on the inner peripheral surface of the seal seat. An annular rubber plate is arranged on the outside of the seal seat. The inner edge of the annular rubber plate is fixedly connected to the seal seat through a plurality of first bolts, and the outer edge of the annular rubber plate is connected to the tail end face of the driving box body through a plurality of second bolts.

2. The anti-jumping oil leakage structure at the tail of the drive box according to claim 1, characterized in that: An inner pressure ring is arranged between the inner edge of the annular rubber plate and the head of the first bolt, and an outer pressure ring is arranged between the outer edge of the annular rubber plate and the head of the second bolt.

3. The anti-jump oil leakage structure at the tail of the drive box according to claim 1, characterized in that: A wear-resistant ring sleeved on the outer peripheral surface of the driving main shaft is arranged on the inner peripheral surface of the seal seat.

4. The anti-jump oil leakage structure at the tail of the drive box according to claim 3, characterized in that: A positioning groove for sleeving the annular rubber plate is formed on the outer peripheral surface of one side of the seal seat.

5. The anti-jumping and oil leakage prevention structure at the tail of the drive box according to claim 1, characterized in that: The annular rubber plate is made of a rubber plate with steel wires inside.

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