Shield tail brush sealing inspection assembly

Abstract

The utility model provides a shield tail brush sealing inspection assembly, a shield tail brush comprises a bottom plate and a steel plate brush arranged on the bottom plate, a moving part is perpendicular to the shield tail direction, and the first end of the moving part is limited on the surface, facing the shield tail, of the steel plate brush; the first displacement measuring element is installed in the shield tail, the moving part is allowed to stretch into the first displacement measuring element due to abutting of the steel plate brush, and the stretching length of the moving part is detected; the second displacement measuring element is installed on the shield tail and detects the vertical distance between the shield tail and the duct piece. According to the utility model, the first displacement measuring element obtains the extension amount of the moving part, so that the extension amount of the moving part extending out of the shield tail is obtained, the length between the shield tail and the segment obtained by the second displacement measuring element is compared, and whether the height of the current shield tail brush is within an acceptable threshold range and whether abrasion occurs is judged according to the established fitting relation between the two; therefore, the sealing performance of the shield tail is judged. Compared with an optical fiber detection device, the device is simple in structure, low in price and convenient to install.

Description

Technical Field

[0001] The utility model relates to the field of shield machines, in particular to a shield tail brush of a shield machine. Background Art

[0002] As cross-river and sea tunnels gradually become a trend, shield work presents the characteristics of "large diameter, high water pressure, and long distance", which puts a great test on the safety of shield machines in tunnel engineering. The characteristics of high water pressure and long distance put forward higher requirements on the sealing performance of the shield tail of the shield machine, and the wear degree of the shield tail brush and whether it has resilience may affect the sealing performance of the shield tail. Summary of the invention

[0003] Purpose of the invention: The purpose of the utility model is to address the deficiencies of the prior art and provide a shield tail brush seal inspection component that can determine the sealing performance of the shield tail brush by collecting the height of the shield tail brush.

[0004] Technical solution: The utility model discloses a shield tail brush seal inspection assembly, wherein the shield tail brush comprises a bottom plate and a steel plate brush arranged on the bottom plate, including:

[0005] A moving member, wherein the moving member is perpendicular to the shield tail direction, and a first end of the moving member is limited to a surface of the steel plate brush facing the shield tail;

[0006] A first displacement measuring element, which is installed in the shield tail, allows the moving part to extend into the first displacement measuring element due to the interference of the steel plate brush, and detects the extending length of the moving part;

[0007] The second displacement measuring element is installed at the shield tail to detect the vertical distance between the shield tail and the pipe segment.

[0008] Furthermore, an elastic member in a compressed state is provided axially of the movable member and connected to the first displacement measuring element. When the steel plate brush is in a natural state, the elastic member is extended and the movable member extends out of the first displacement measuring element; when the steel plate brush contacts the pipe segment, the elastic member is compressed and the movable member extends into the first displacement measuring element.

[0009] Furthermore, a sealing ring is provided between the moving part and the elastic part.

[0010] Furthermore, the bottom plate is configured with a mounting hole for the moving member to pass through.

[0011] Furthermore, the moving member is movably sleeved in the first displacement measuring element along the axial direction.

[0012] Furthermore, the outgoing wire of the first displacement measuring element passes through a wiring groove penetrating the shield tail and comes out from the front end of the shield tail.

[0013] Beneficial effect: The utility model sets a moving part between the steel plate brush and the bottom plate of the shield tail brush. When the steel plate brush contacts the pipe segment, it pushes the moving part to extend into the first displacement measuring element. The first displacement measuring element obtains the extension amount of the moving part, thereby obtaining the extension amount of the moving part out of the shield tail. The length between the shield tail and the pipe segment obtained by the second displacement measuring element is compared, and according to the established fitting relationship between the two, it is judged whether the current height of the shield tail brush is within the acceptable threshold range and whether wear occurs, thereby judging the sealing performance of the shield tail. Compared with the optical fiber detection device, this method has a simple structure, low price and easy installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the shield tail brush seal inspection assembly of the utility model. DETAILED DESCRIPTION

[0015] The technical solution of the utility model is described in detail below with reference to the accompanying drawings, but the protection scope of the utility model is not limited to the embodiments.

[0016] Generally, at least three shield tail brushes are installed along the length direction of the shield tail 6, and the shield tail brush includes a bottom plate 9 and a steel plate brush 2 arranged on the bottom plate 9. The steel plate brush 2 of the shield tail brush contacts the concrete segment 1, and a shield tail 6 grease cavity is formed between the adjacent shield tail brushes, the shield tail 6 and the segment 1. If the shield tail brush is worn, it will affect the sealing performance of the shield tail brush and cause grease leakage.

[0017] Based on this, the present application proposes a shield tail brush seal inspection assembly, including a moving part 8, a first displacement measuring element 3 and a second displacement measuring element.

[0018] The extending direction of the moving member 8 is perpendicular to the direction of the shield tail 6, and the first end of the moving member 8 is limited to the surface of the steel plate brush 2 facing the shield tail 6, thereby generating abutment.

[0019] The first displacement measuring element 3 is installed in the shield tail 6, allowing the moving member 8 to extend into the first displacement measuring element 3 due to the resistance of the steel plate brush 2, and detecting the extending length of the moving member 8.

[0020] When the shield machine is stopped or working, the moving member 8 can extend into the first displacement measuring element 3 according to the state of the steel brush 2. It can be imagined that when the shield machine is not in working state, the steel brush 2 does not contact the segment 1. Figure 1 As shown in the dotted line state, at this time, the steel plate brush 2 does not press the moving part 8 into the first displacement measuring element 3, and the moving part 8 extends out of the shield tail, and the starting end may be just located on the surface of the shield shell; when the shield machine is tunneling, the steel plate brush 2 directly contacts the pipe segment 1, and the pipe segment 1 compresses the steel plate brush 2. At this time, the state of the steel plate brush 2 is as follows: Figure 1As shown by the solid line, at this time, the steel plate brush 2 will push the moving part 8 into the first displacement measuring element 3, and the first displacement measuring element 3 detects the extension amount of the moving part 8.

[0021] The second displacement measuring element is installed at the shield tail to detect the vertical distance between the shield tail and the pipe segment 1. By comparing the data measured by the first displacement measuring element 3 and the second displacement measuring element, it can be judged whether the shield tail brush is worn and whether its sealing performance is guaranteed.

[0022] In order to ensure the stability of the moving member 8 during the extension and retraction process, an elastic member in a compressed state (not shown in the figure) is provided in the axial direction of the moving member 8 to connect to the first displacement measuring element 3. When the steel plate brush 2 is in a natural state, the elastic member is extended and the moving member 8 extends out of the first displacement measuring element 3; when the steel plate brush 2 contacts the pipe segment, the elastic member is compressed and the moving member 8 extends into the first displacement measuring element 3. As one implementation method, the elastic member can be a spring coaxially arranged in the moving member 8 and connected to the first displacement measuring element 3.

[0023] In order to prevent the grease leakage of the shield tail 6, a sealing ring is provided between the moving part 8 and the elastic part.

[0024] The installation position of the first displacement measuring element 3 can be directly fixed on the bottom plate 9, or can be installed on the shield tail 6 corresponding to the position of the bottom plate 9. For example, the first displacement measuring element 3 is arranged inside the shield shell, and the bottom plate 9 is configured with a mounting hole for the first displacement measuring element 3 to extend and connect to the moving part 8. In this case, the first displacement measuring element 3 is protected inside the shield tail 6, so it will not be damaged during long-term use due to the shield operation, thereby improving the service life.

[0025] The outgoing line of the first displacement measuring element 3 passes through the wiring groove 7 that penetrates the shield tail 6 and comes out from the front end of the shield tail 6. After passing through, it can be connected to the host computer through the demodulation module. At the same time, the second displacement measuring element is also connected to the host computer through the demodulation module. After the demodulation module analyzes the data, the host computer compares the data of the two, and determines whether there is a deviation in the displacement through the existing data processing method, and obtains the wear result.

[0026] The inspection method using the above-mentioned shield tail brush seal inspection assembly is as follows:

[0027] (1) Conduct tests on a shield tail brush wear simulation platform to simulate actual on-site conditions;

[0028] After installing the moving part 8, the first displacement measuring element 3, and the second displacement measuring element, the module on the shield tail brush wear simulation platform is controlled to press down the shield tail brush to different degrees to control the height L between the steel plate brush 2 of the shield tail brush and the shield tail brush bottom plate 9, and the extension amount of the moving part 8 detected by the first displacement measuring element 3 at this height is recorded, and the extension amount H of the moving part 8 is calculated. The extension amount H is the initial extension amount of the moving part 8 minus the extension amount; after multiple tests, the corresponding relationship between H and L is fitted and stored in the host computer;

[0029] (2) Determination of shield tail brush:

[0030] The host computer reads the actual height L measured by the current second displacement detection element. At the same time, the host computer reads the extension amount measured by the current first displacement measurement element 3, and obtains the extension amount H of the current moving member 8 by subtracting the extension amount from the initial extension amount of the moving member 8;

[0031] The upper computer calculates the theoretical height L' corresponding to the extension amount H through the fitting relationship according to the extension amount H, and compares the relationship between the theoretical height L' and the actual height L; if the difference between the two is less than the threshold, it means that the wear degree of the shield tail brush is within the acceptable range; if it exceeds the threshold, the wear degree needs to be replaced; the threshold here can be selected as 5mm according to the actual situation;

[0032] Similarly, the host computer can also calculate the theoretical extension amount H' corresponding to the current actual height L through the fitting relationship according to the actual height L, and compare the relationship between the theoretical extension amount H' and the extension amount H; if the difference between the two is less than the threshold, it means that the wear degree of the shield tail brush is within an acceptable range; if it exceeds the threshold, the wear degree requires replacement of the shield tail brush.

[0033] If the height L read by the host computer system keeps changing, while the extension H remains unchanged, the shield tail brush has lost its resilience or has been worn to the point where it cannot press the moving part 8 back, and needs to be replaced immediately.

[0034] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be interpreted as limiting the present invention itself. Various changes can be made to it in form and detail without departing from the spirit and scope of the present invention defined in the appended claims.

Claims

1. A shield tail brush seal inspection assembly, the shield tail brush comprising a bottom plate and a steel plate brush arranged on the bottom plate, characterized in that: include: A moving member, wherein the moving member is perpendicular to the shield tail direction, and a first end of the moving member is limited to a surface of the steel plate brush facing the shield tail; A first displacement measuring element, which is installed in the shield tail, allows the moving part to extend into the first displacement measuring element due to the interference of the steel plate brush, and detects the extending length of the moving part; The second displacement measuring element is installed at the shield tail to detect the vertical distance between the shield tail and the pipe segment.

2. The shield tail brush seal inspection assembly according to claim 1, characterized in that: The movable part is provided with an elastic part in a compressed state in the axial direction thereof, connected to the first displacement measuring element. When the steel plate brush is in a natural state, the elastic part is extended and the movable part extends out of the first displacement measuring element; when the steel plate brush contacts the pipe segment, the elastic part is compressed and the movable part extends into the first displacement measuring element.

3. The shield tail brush seal inspection assembly according to claim 1, characterized in that: A sealing ring is arranged between the moving part and the elastic part.

4. The shield tail brush seal inspection assembly according to claim 1, characterized in that: The bottom plate is configured with a mounting hole for the moving member to pass through.

5. The shield tail brush seal inspection assembly according to claim 1, characterized in that: The moving part is movably sleeved in the first displacement measuring element along the axial direction.

6. The shield tail brush seal inspection assembly according to claim 1, characterized in that: The outgoing wire of the first displacement measuring element passes through the wiring groove penetrating the shield tail and comes out from the front end of the shield tail.

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