Lip wear monitoring system for lip seal of rotating shaft

Abstract

The invention relates to a lip wear monitoring system for a lip seal of a rotating shaft, the lip wear monitoring system comprises an elastic conductor sheet (1), an insulating layer (2), the lip seal (3), leads (4) and (5), a measuring module (6), an indicating lamp (7), the rotating shaft (8), a lower support ring (9), an upper support ring (10) and a cavity (11), the elastic conductor sheet (1) and the lead (4) are connected and conducted, the lead (5) and the rotating shaft (8) are connected and conducted through an electric brush, and the measuring module (6) is connected and conducted with the cavity (11). And the elastic conductor sheet (1) is isolated from the rotating shaft (8) by the lip seal (3). The sealing lip abrasion monitoring system is reliable, sealing replacement can be prompted in advance before sealing leakage, bearing damage caused by leakage is prevented, precious preparation time is won for sealing replacement, maintenance time is shortened as much as possible, shutdown loss is reduced, and the sealing lip abrasion monitoring system is particularly suitable for the conditions, needing sealing abrasion monitoring, of shield tunneling machines, ship tail shaft seals and the like.

Description

Technical Field

[0001] The invention relates to the technical field of sealing, in particular to a lip wear monitoring system for a lip seal of a rotating shaft. Background Art

[0002] The main drive seal of the shield machine is the "immune system" of the shield machine. Once there is a problem with the main drive seal, the shield machine will be paralyzed and unable to operate. In addition, it is difficult to replace the seal of the shield machine, and the related replacement costs and lost work time costs caused by the replacement are very high.

[0003] This requires an early warning when the seal is about to fail so that preparations for replacing the seal can be made. Therefore, it is necessary to develop a lip wear monitoring system for lip seals for early warning of seal failure. Summary of the invention

[0004] Technical solution:

[0005] In order to solve the above problems, the present invention adopts a new design scheme and provides a lip wear monitoring system for a lip seal of a rotating shaft, characterized in that it comprises an elastic conductor sheet (1), a lip seal (3), a first wire (4), a second wire (5), a measuring module (6) and a rotating shaft (8).

[0006] The elastic conductor sheet (1) is arranged on the non-contact surface between the lip portion of the lip seal (3) and the rotating shaft (8), and is isolated from the rotating shaft (8).

[0007] The elastic conductor sheet (1), the first wire (4), the measuring module (6), the second wire (5) and the rotating shaft (8) are connected and conducted in sequence.

[0008] When the lip seal (3) is worn to a preset position where replacement is required, the elastic conductor sheet (1) is in contact with the rotating shaft (8) and is connected, and an indicator light (7) located on the measuring module (6) lights up.

[0009] Preferably, the elastic conductor sheet (1) is a conductive spring sheet, the surface of which is covered with an insulating layer (2), the lip seal (3) is an insulator, and the rotating shaft (8) is a conductor.

[0010] Preferably, the lip wear monitoring system comprises a lower support ring (9), an upper support ring (10) and a cavity (11) for fixing the elastic conductor sheet (1) and the lip seal (3).

[0011] Preferably, when the lip seal (3) is not worn to a preset position requiring replacement, the elastic conductor sheet is isolated from the rotating shaft (8) and the indicator light (7) is turned off.

[0012] Preferably, the second conducting wire (5) is connected to the rotating shaft (8) via a brush.

[0013] The present invention provides a lip wear monitoring system for a lip seal of a rotating shaft, which can prompt the replacement of the seal in advance before the seal leaks, prevent bearing damage caused by leakage, gain valuable preparation time for seal replacement, shorten maintenance time as much as possible, and reduce downtime losses. The lip wear monitoring system of the present invention is particularly suitable for shield machines, ship tail shaft seals, and other situations where seal wear needs to be monitored.

[0014] The present invention is further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 :Structure diagram of lip wear monitoring system for lip seal

[0016] Figure 2 : Schematic diagram of the lip wear monitoring system of the lip seal after assembly

[0017] Figure 3 :Lip wear monitoring system for lip seals Schematic diagram of seal lip wear Wherein:

[0018] Figure 1 :1. Elastic conductor sheet, 2. Insulating layer, 3. Lip seal, 4. Wire with insulating layer, 5. Wire with insulating layer, 6. Measuring module, 7. Indicator light, 8. Rotating shaft, 9. Lower support ring, 10. Upper support ring, 11. Cavity.

[0019] Figure 2 :1. Elastic conductor sheet, 2. Insulating layer, 3. Lip seal, 4. Wire with insulating layer, 5. Wire with insulating layer, 6. Measuring module, 7. Indicator light, 8. Rotating shaft, 9. Lower support ring, 10. Upper support ring, 11. Cavity.

[0020] Figure 3 :1. Elastic conductor sheet, 2. Insulating layer, 3. Lip seal, 4. Wire with insulating layer, 5. Wire with insulating layer, 6. Measuring module, 7. Indicator light, 8. Rotating shaft, 9. Lower support ring, 10. Upper support ring, 11. Cavity. DETAILED DESCRIPTION

[0021] Example:

[0022] A lip seal lip wear monitoring system comprises an elastic conductor sheet (1), an insulating layer (2), a lip seal (3), a wire with an insulating layer (4), a wire with an insulating layer (5), a measuring module (6), an indicator light (7), a rotating shaft (8), a lower support ring (9), an upper support ring (10) and a cavity (11).

[0023] The material used for the elastic conductor sheet (1) is a thin spring sheet with a thickness of ≤0.3 mm, such as a copper spring sheet and a stainless steel spring sheet, which is cut into a long strip by wire cutting and then formed by stamping.

[0024] The insulating layer (2) coated on the surface of the elastic conductor sheet (1) can be made of insulating rubber paste, which is sprayed on the elastic conductor sheet (1) by spraying and then vulcanized in a vulcanizer.

[0025] The lip seal (3) is made of insulating rubber and can be integrally molded by a mold; a large diameter lip seal can also be molded by segmented vulcanization.

[0026] The first conductive wire (4) and the second conductive wire (5) are standard conductive wires with insulation layers.

[0027] An indicator light (7) is installed on the measuring module (6), and the measuring module (6) provides power for the measuring circuit.

[0028] The rotating shaft (8) is a metal conductor and is formed by machining.

[0029] The lower support ring (9), the upper support ring (10) and the cavity (11) are all formed by machining and are used to fasten the elastic conductor sheet (1), the insulating layer (2) and the lip seal (3).

[0030] After the lip seal (3) is installed, the elastic conductor sheet (1) and the rotating shaft (8) are isolated from each other, the circuit between the elastic conductor sheet (1), the first wire (4), the measuring module (6), the second wire (5) and the rotating shaft (8) is disconnected, and the indicator light (7) is off.

[0031] When the lip seal (3) is worn to a preset position where the seal needs to be replaced, the elastic conductor sheet (1) and the rotating shaft (8) are in contact and connected, and the indicator light (7) lights up, prompting the replacement of the lip seal.

[0032] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A lip wear monitoring system for a lip seal of a rotating shaft, characterized in that The invention comprises an elastic conductor sheet (1), a lip seal (3), a first wire (4), a second wire (5), a measuring module (6) and a rotating shaft (8), The elastic conductor sheet (1) is arranged on the non-contact surface between the lip portion of the lip seal (3) and the rotating shaft (8), and is isolated from the rotating shaft (8). The elastic conductor sheet (1), the first wire (4), the measuring module (6), the second wire (5) and the rotating shaft (8) are connected and conducted in sequence. When the lip seal (3) is worn to a preset position where replacement is required, the elastic conductor sheet (1) is in contact with the rotating shaft (8) and is connected, and an indicator light (7) located on the measuring module (6) lights up.

2. According to the lip wear monitoring system of claim 1, the elastic conductor sheet (1) is a conductive spring sheet, the surface of which is covered with an insulating layer (2), the lip seal (3) is an insulator, and the rotating shaft (8) is a conductor.

3. The lip wear monitoring system according to claim 1, comprising a lower support ring (9), an upper support ring (10) and a cavity (11) for fixing the elastic conductor sheet (1) and the lip seal (3).

4. According to the lip wear monitoring system of claim 1, when the lip seal (3) is not worn to a preset position requiring replacement, the elastic conductor sheet is isolated from the rotating shaft (8) and the indicator light (7) is turned off.

5. The lip wear monitoring system according to claim 1, wherein the second wire (5) is connected to the rotating shaft (8) via a brush.

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