A shield machine excavation gap measuring device

Abstract

The present invention discloses a device for measuring the excavation gap of a shield machine, which solves the problem of inaccurate excavation gap measurement of existing devices. In the present invention, a guide sleeve is fixedly provided on the shield shell of the shield machine, a telescopic device is provided at the rear of the guide sleeve, a displacement sensor is embedded in the telescopic device, and a probe rod is connected to the telescopic rod head of the telescopic device. The present invention uses a displacement sensor to measure the displacement of the probe rod to achieve the purpose of measuring the excavation gap. According to the measured excavation gap, it is judged whether the outermost trajectory tool needs to be replaced, and at the same time, a certain basis is provided for the adjustment of the shield posture. The telescopic probe rod ensures that the measuring device is not damaged when the shield machine is excavating. A sealing member that acts as a micro scraper is provided on the inner wall of the through hole of the guide sleeve to prevent pollutants such as debris from entering the shield body.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel excavation, in particular to a shield machine excavation gap measuring device. Background Art

[0002] In the current tunnel construction, shield technology has been gradually widely used due to its advantages of high degree of automation, good construction safety, fast progress and low pollution. In order to meet the turning requirements of the tunnel, the cutter diameter of the shield machine excavating the tunnel is larger than the shield diameter. If the cutter diameter is less than or equal to the shield diameter, the shield machine will be stuck, causing the shield machine to stop. At the same time, in the construction of small curved tunnels, even if the cutter diameter is slightly larger than the front shield diameter, it may not meet the tunnel curve and may cause the shield to be stuck. Generally speaking, the radius of the tunnel curve is referenced when designing the shield machine, but in the actual excavation process of the shield machine, as the cutter wears, the excavation diameter continues to decrease, resulting in the shield machine being stuck.

[0003] In order to prevent the shield machine from getting stuck, it is necessary to detect the wear of the cutterhead tool in time. If the wear reaches a certain level, a new tool needs to be replaced. However, the cutterhead works in a soil bin environment with a certain pressure, and the shield machine operator cannot detect it in time. In order to solve the above problems, the conventional practice is to install a tool wear detection device, but the wear detection device is very easy to be damaged due to the harsh working environment, and there are certain technical barriers to signal transmission. Another approach is to install a detection device on the cutterhead and judge the cutterhead excavation diameter by the extension of the device. Due to the limitations of the cutterhead structure, the probe of this type of device is designed on the panel and the structure is small. The panel is constantly worn during excavation, the excavation gap measurement is inaccurate, and the lubrication, oil and other pipelines of the device need to pass through the central rotary channel of the shield machine, and the probability of failure is high. The excavation gap refers to the radius of the shield machine cutterhead minus the radius of the shield body, that is, the distance between the excavation wall and the shield body. Summary of the invention

[0004] In order to solve the problem of inaccurate excavation gap measurement of existing devices, the present invention proposes a shield machine excavation gap measurement device, which can accurately detect the cutter head excavation diameter in the tunnel.

[0005] The technical solution of the present invention is: a shield machine excavation gap measuring device, a guide sleeve is fixedly provided on the shield shell of the shield machine, a slideway is provided in the guide sleeve, a telescopic device is provided at the rear of the guide sleeve, a displacement sensor is embedded in the telescopic device, a probe rod is connected to the telescopic rod head of the telescopic device, and the probe rod is slidably arranged in the slideway of the guide sleeve.

[0006] The guide sleeve is provided with a thread groove, and the telescopic device cooperates with the thread groove through a bolt.

[0007] A ball valve is arranged between the telescopic device and the guide sleeve, and the ball valve is respectively connected with the telescopic device and the guide sleeve through bolts.

[0008] An extension tube is provided between the guide sleeve and the telescopic device, and connecting plates are provided at both ends of the extension tube. The connecting plate at one end of the extension tube is connected to the guide sleeve by bolts, and the connecting plate at the other end of the extension tube is connected to the telescopic device by bolts.

[0009] A ball valve is arranged between the extension tube and the guide sleeve, and the ball valve is respectively connected with the extension tube and the guide sleeve through bolts.

[0010] The sum of the lengths of the probe rod and the telescopic rod of the telescopic device is greater than the length of the extension tube.

[0011] An oil channel is arranged in the guide sleeve, the oil channel is connected with the slideway of the guide sleeve, and an oil nozzle is arranged at the entrance of the oil channel.

[0012] A sealing member is arranged on the inner wall of the through hole of the guide sleeve, and the sealing member matches with the probe rod.

[0013] The present invention uses a displacement sensor to measure the displacement of the probe rod to achieve the purpose of measuring the excavation gap. According to the measured excavation gap, it is judged whether the outermost track tool needs to be replaced, and at the same time, a certain basis is provided for the shield posture adjustment. The retractable probe rod ensures that the device is not damaged during the shield excavation. A seal that acts as a micro scraper is provided on the inner wall of the through hole of the guide jacket to prevent contaminants such as slag from entering the shield body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the working state of the present invention;

[0017] Figure 3 The figure is a diagram of the installation position of the present invention on the shield body.

[0018] In the figure, 1, telescopic device, 2, probe rod, 3, ball valve, 4, guide sleeve, 401, seal, 402, threaded groove, 5, oil channel, 501, oil nozzle, 6, shield shell, 7, excavation wall, 8, extension pipe, 801, connecting plate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1: Figure 1 and Figure 2 As shown, a shield machine excavation gap measuring device is provided, and a guide sleeve 4 is provided on the shield shell 6 of the shield machine, and the shield shell 6 is welded to the guide sleeve 4. A slideway is provided in the middle of the guide sleeve 4, and a telescopic device 1 is provided at the rear of the guide sleeve 4. The telescopic device 1 mostly adopts a hydraulic cylinder, and a displacement sensor is embedded in the telescopic device 1. The end of the telescopic rod of the telescopic device 1 is connected to a probe rod 2, and the probe rod 2 is slidably set in the slideway of the guide sleeve 4. The telescopic rod of the telescopic device 1 drives the probe rod 2 to telescope back and forth in the slideway of the guide sleeve 4. Before the probe rod 2 telescopes, the front part of the probe rod 2 is flush with the outer side of the guide sleeve 4. When the probe rod 2 reaches the excavation wall 7, the hydraulic system of the shield machine controls the telescopic device 1 to stop moving. The displacement sensor can obtain the excavation gap thickness by detecting the moving distance of the telescopic rod of the telescopic device 1. It is judged whether the tool needs to be replaced based on the measured excavation gap, and at the same time, it provides a certain basis for the shield posture adjustment. In order to make the measurement data more accurate, such as Figure 3 As shown, two devices are provided on the shield 6 for comparing the measured data to make the measured data more accurate.

[0021] Example 2: Figure 1 and Figure 2 As shown, a shield machine excavation gap measuring device, in order to facilitate the replacement of later parts after damage, the guide sleeve 4 is provided with a threaded groove 402, and the telescopic device 1 is matched with the threaded groove 402 through bolts. A ball valve 3 is provided between the telescopic device 1 and the guide sleeve 4, and the ball valve 3 is respectively connected to the telescopic device 1 and the guide sleeve 4 through bolts. The other structures are the same as those in Example 1.

[0022] Example 3: Figure 1 and Figure 2 As shown, a shield machine excavation gap measuring device, in order to provide enough space for the telescopic rod and the probe rod 2 of the telescopic device 1 to perform telescopic movement, an extension tube 8 is provided between the guide sleeve 4 and the telescopic device 1, and the sum of the lengths of the probe rod 2 and the telescopic rod of the telescopic device 1 is greater than the length of the extension tube 8. Both ends of the extension tube 8 are provided with connecting plates 801, the connecting plate 801 at one end of the extension tube 8 is connected to the guide sleeve 4 by bolts, and the connecting plate 801 at the other end of the extension tube 8 is connected to the telescopic device 1 by bolts. The other structures are the same as those in Example 1.

[0023] Example 4: Figure 1 and Figure 2 As shown, a shield machine excavation gap measuring device, in order to facilitate the removal of the components at the rear of the guide sleeve 4, a ball valve 3 is provided between the extension pipe 8 and the guide sleeve 4, and the ball valve 3 is connected to the extension pipe 8 and the guide sleeve 4 respectively by bolts. Other structures are the same as those of Example 3.

[0024] Example 5: Figure 1 and Figure 2 As shown, a shield machine excavation gap measuring device is provided. In order to prevent contaminants such as debris from entering the shield body, a seal 401 is provided on the inner wall of the through hole of the guide sleeve 4. The seal 401 matches the probe rod 2. When the probe rod 2 retracts backward, the seal 401 scrapes the debris on the probe rod 2 and drops it into the through hole of the guide sleeve 4. When the probe rod 2 is pushed outward, the debris in the through hole is pushed out of the through hole by the probe rod 2. The other structures are the same as those in Example 1.

[0025] Embodiment 6: A shield machine excavation gap measuring device, in order to make the probe rod 2 and the piston of the telescopic device 1 slide more smoothly in the guide sleeve 4 and prevent the probe rod 2 from being worn, as shown in FIG. Figure 1 and Figure 2 As shown, an oil passage 5 is provided on the guide sleeve 4, the oil passage 5 is connected to the through hole of the guide sleeve 4, an oil nozzle 501 is provided at the entrance of the oil passage 5, and lubricating oil is injected into the through hole in the guide sleeve 4 through the oil passage 5. Other structures are the same as those of the fifth embodiment.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A shield machine excavation gap measuring device, characterized in that: A guide sleeve (4) is fixedly provided on a shield shell (6) of a shield machine, a slideway is provided in the guide sleeve (4), a telescopic device (1) is provided at the rear of the guide sleeve (4), a displacement sensor is embedded in the telescopic device (1), a probe rod (2) is connected to the telescopic rod head of the telescopic device (1), and the probe rod (2) is slidably arranged in the slideway of the guide sleeve (4); A sealing member (401) is provided on the inner wall of the through hole of the guide sleeve (4), and the sealing member (401) cooperates with the probe rod (2); Before the probe rod (2) performs telescopic movement, the front portion of the probe rod (2) is flush with the outer side of the guide sleeve (4). When the probe rod (2) reaches the excavation wall (7), the hydraulic system of the shield machine controls the telescopic device (1) to stop moving. The displacement sensor can obtain the excavation gap thickness by detecting the moving distance of the telescopic rod of the telescopic device (1). When the probe rod (2) retracts backward, the sealing member (401) scrapes the dirt on the probe rod (2) and drops it into the through hole of the guide sleeve (4); when the probe rod (2) is pushed outward, the dirt in the through hole is pushed out of the through hole by the probe rod (2).

2. The shield machine excavation gap measuring device according to claim 1, characterized in that: The guide sleeve (4) is provided with a thread groove (402), and the telescopic device (1) cooperates with the thread groove (402) via a bolt.

3. The shield machine excavation gap measuring device according to claim 1 or 2, characterized in that: A ball valve (3) is provided between the telescopic device (1) and the guide sleeve (4), and the ball valve (3) is connected to the telescopic device (1) and the guide sleeve (4) respectively by bolts.

4. The shield machine excavation gap measuring device according to claim 1 or 2, characterized in that: An extension tube (8) is provided between the guide sleeve (4) and the telescopic device (1), and connecting plates (801) are provided at both ends of the extension tube (8). The connecting plate (801) at one end of the extension tube (8) is connected to the guide sleeve (4) by bolts, and the connecting plate (801) at the other end of the extension tube (8) is connected to the telescopic device (1) by bolts.

5. The shield machine excavation gap measuring device according to claim 4, characterized in that: A ball valve (3) is provided between the extension tube (8) and the guide sleeve (4), and the ball valve (3) is connected to the extension tube (8) and the guide sleeve (4) respectively by bolts.

6. The shield machine excavation gap measuring device according to claim 5, characterized in that: The sum of the lengths of the probe rod (2) and the telescopic rod of the telescopic device (1) is no greater than the length of the extension tube (8).

7. The shield machine excavation gap measuring device according to claim 1 or 6, characterized in that: An oil passage (5) is provided in the guide sleeve (4), the oil passage (5) is connected to the slideway of the guide sleeve (4), and an oil nozzle (501) is provided at the entrance of the oil passage (5).

Images