Adaptive shield tail grease injection system

Abstract

The invention discloses an adaptive shield tail grease injection system, comprising a grease injection pipeline (1), a shield tail (5) and a pipe segment (6); a plurality of distance sensors (4) are arranged on the inner wall of the shield tail (5) of the shield machine, the plurality of distance sensors (4) are arranged facing the pipe segment (6), and the detection directions of the plurality of distance sensors (4) coincide with the radial direction of the pipe segment (6); a controller (2) is arranged in the shield machine, the output ends of the plurality of distance sensors (4) are respectively electrically connected to the input ends of the controller (2), and the output end of the controller (2) is electrically connected to the shield machine control system. The invention can use the distance change between the shield tail and the pipe segment of the shield machine to judge the volume change of the shield tail grease chamber, thereby providing an accurate and reliable basis for the adaptive optimization of the grease filling scheme.

Description

Technical Field

[0001] The invention relates to sealing equipment for a shield machine, in particular to an adaptive shield tail grease injection system. Background Art

[0002] With the development of cities, my country is carrying out large-scale construction of urban rail transit. While efficiently building rail transit, the safety and reliability of tunnels must be guaranteed. The quality of shield machine grouting construction in tunnel engineering depends largely on the shield tail sealing performance. Shield tail sealing grease can prevent risks such as water leakage, slurry leakage and mud leakage. In the process of tunnel construction, injecting sealing grease into the shield tail grease cavity is a very important operation, which is directly related to the construction quality and subsequent planning arrangements.

[0003] At present, during the advancement of the shield machine, grease is injected into the grease chamber at the tail of the shield through a grease pump through a pipeline. Among them, the system of the shield machine will use the method of quantitative filling and pressure control, that is, each filling port is filled with a certain amount of grease, or when the pressure of the pipeline is detected to reach the set value, it will automatically jump to the filling point at the next position in sequence, and circulate in sequence to ensure that the grease enters the grease chamber at the tail of the shield.

[0004] During the tunneling process of the shield machine, its axis direction may encounter horizontal turns or ups and downslopes. In this case, the volume of the shield tail grease chamber at different positions will change, and the grease demand of each shield tail grease chamber will also be different. If the existing grease injection method is used, although the total amount of injection can be controlled, it is impossible to distinguish the situation where the volume of the shield tail grease chamber is inconsistent. When the shield machine is tunneling on a curve or upslope, the side with a small volume of the shield tail grease chamber will have too much grease overflowing, wasting grease, while the side with a large volume of the shield tail grease chamber will have too little sealing grease, resulting in reduced sealing performance, slurry backflow, and even damage to the shield tail brush. Summary of the invention

[0005] The purpose of the present invention is to provide an adaptive shield tail grease injection system, which can use the distance change between the shield tail and the segment of the shield machine to judge the volume change of the shield tail grease chamber, thereby providing an accurate and reliable basis for the adaptive optimization of the grease filling scheme.

[0006] The present invention is achieved in that:

[0007] An adaptive shield tail grease injection system comprises a grease injection pipeline, a shield tail of a shield machine and a pipe segment; the pipe segment is installed on the inner side of the shield tail of the shield machine, and a plurality of shield tail grease cavities are formed between the outer wall of the pipe segment and the inner wall of the shield tail of the shield machine; a plurality of grease injection pipelines are arranged in the shield tail of the shield machine, the oil inlets of the plurality of grease injection pipelines are connected to a grease pump, and the oil outlets of the plurality of grease injection pipelines are respectively connected to a plurality of shield tail grease cavities, so that the grease is respectively injected into the plurality of shield tail grease cavities;

[0008] A plurality of distance sensors are arranged on the inner wall of the shield tail of the shield machine, the plurality of distance sensors are arranged facing the pipe segment, and the detection directions of the plurality of distance sensors coincide with the radial direction of the pipe segment; a controller is arranged in the shield machine, the output ends of the plurality of distance sensors are respectively electrically connected to the input ends of the controller, and the output end of the controller is electrically connected to the shield machine control system.

[0009] A gap is left between the distance sensor and the outer wall of the pipe segment.

[0010] Along the tunneling direction of the shield machine, each of the distance sensors and at least one shield tail grease chamber are located on the same straight line.

[0011] Along the tunneling direction of the shield machine, the multiple distance sensors are located upstream of the shield tail grease chamber.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. Since the present invention is provided with a distance sensor, it can detect the distance change between the shield tail and the pipe segment of the shield machine during the tunneling construction of the shield machine, which is conducive to judging and accurately calculating the volume change of each shield tail grease chamber, thereby providing an accurate and reliable basis for the adaptive optimization of the grease filling scheme of the shield machine control system, improving the sealing and waterproof properties of the shield tail side, while protecting the shield tail brush and avoiding the waste of grease, thereby ensuring the safety of tunneling construction and reducing construction costs.

[0014] 2. Since the present invention is provided with a PLC controller, it can judge and accurately calculate the volume change of each shield tail grease chamber according to the distance data between the shield tail and the pipe segment, so that the shield machine control system can provide priority filling and increase the filling amount for the shield tail grease chamber with increased volume, and reduce the filling amount for the shield tail grease chamber with reduced volume, ensuring that each shield tail grease chamber is full of grease, and minimize grease overflow due to excessive injection, thereby reducing grease consumption and waste. It is particularly suitable for situations where the shield machine is excavating to special positions such as bends, uphill and downhill. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a sectional view of the use of the self-adaptive shield tail grease injection system of the present invention.

[0016] In the figure, 1 is grease injection pipeline, 2 is controller, 3 is shield tail grease chamber, 4 is distance sensor, 5 is shield tail of shield machine, 51 is shield tail brush, and 6 is pipe segment. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] Please see attached Figure 1, an adaptive shield tail grease injection system, including a grease injection pipeline 1, a shield tail 5 of a shield machine and a pipe segment 6; the pipe segment 6 is installed on the inner side of the shield tail 5 of the shield machine, and a plurality of shield tail grease chambers 3 are formed between the outer wall of the pipe segment 6 and the inner wall of the shield tail 5 of the shield machine through the shield tail brush 51; a plurality of grease injection pipelines 1 are arranged in the shield tail 5 of the shield machine, the oil inlets of the plurality of grease injection pipelines 1 are connected to a grease pump (not shown in the figure), and the oil outlets of the plurality of grease injection pipelines 1 are respectively connected to a plurality of shield tail grease chambers 3, so that the grease is respectively injected into the plurality of shield tail grease chambers 3. The scheme of filling the grease into the shield tail grease chamber 3 through the grease injection pipeline 1 is determined and executed by the shield machine control system, which will not be repeated here. The number of grease injection pipelines 1 and the shield tail grease chamber 3 are determined by the specifications and performance of the shield machine.

[0019] A plurality of distance sensors 4 are arranged on the inner wall of the shield tail 5 of the shield machine, and the plurality of distance sensors 4 are arranged facing the pipe segment 6, and the detection direction of the plurality of distance sensors 4 coincides with the radial direction of the pipe segment 6; a controller 2 is arranged in the shield machine, and the output ends of the plurality of distance sensors 4 are respectively electrically connected to the input ends of the controller 2, and the output end of the controller 2 is electrically connected to the shield machine control system. During the tunneling process of the shield machine, the plurality of distance sensors 4 are used to respectively collect the distance change between the pipe segment 6 and the shield tail 5 of the shield machine, so as to judge the volume change of the shield tail grease chamber 3 through the controller 2, which is used to optimize the grease filling scheme of the shield machine control system.

[0020] Preferably, the distance sensor 4 may be an infrared sensor, a laser sensor, etc., for detecting the distance value and its change.

[0021] A gap is left between the distance sensor 4 and the outer wall of the pipe segment 6 to retain a suitable safety distance and construction space to prevent the pipe segment 6 from colliding with the distance sensor 4 during installation and causing damage to the distance sensor 4. The size of the gap is determined according to actual construction requirements.

[0022] Along the tunneling direction of the shield machine, each of the distance sensors 4 is located on the same straight line as at least one shield tail grease chamber 3. The distance data detected by each distance sensor 4 corresponds to the height change data of each shield tail grease chamber 3 on the same straight line as the distance sensor 4, thereby ensuring that the volume change of each shield tail grease chamber 3 can be detected, thereby ensuring the accuracy and adaptability of grease filling of each shield tail grease chamber 3.

[0023] Along the tunneling direction of the shield machine, the plurality of distance sensors 4 are located upstream of the shield tail grease chamber 3. During the tunneling process of the shield machine, the distance sensors 4 and the controller 2 are first used to determine the volume change of the shield tail grease chamber 3, and then grease is added.

[0024] The working principle of the present invention during the shield machine excavation process is:

[0025] The shield machine performs tunnel excavation construction according to the existing technology. During the construction process, multiple distance sensors 4 are used to detect the distance between the inner wall of the shield tail 5 and the outer wall of the pipe segment 6. The distance is the height of one or more shield tail grease cavities 3 on the straight line where each distance sensor 4 is located. Due to the inconvenience of the width and length of the shield tail grease cavity 3, the height change of the shield tail grease cavity 3 can be used to judge the increase or decrease of its volume.

[0026] When a distance sensor 4 detects that the height of the corresponding shield tail grease chamber 3 increases, that is, the volume of the shield tail grease chamber 3 increases, the distance sensor 4 transmits the distance data to the controller 2. The controller 2 can use a PLC (Programmable Logic Controller) control device, and the controller 2 can calculate the volume change of the shield tail grease chamber 3 according to the increase in the distance data, thereby increasing the grease filling amount of the shield tail grease chamber 3 according to the system grease filling rule.

[0027] Since the cross-sections of the segment 6 and the shield tail 5 of the shield machine are both circular, and the segment 6 and the shield tail 5 of the shield machine are coaxial during normal excavation, the coaxiality of the segment 6 and the shield tail 5 of the shield machine changes when turning or going uphill or downhill, and the height of the shield tail grease cavity 3 on one side of the segment 6 increases, then the height of the shield tail grease cavity 3 on the other side of the segment 6 will decrease.

[0028] When a distance sensor 4 detects that the height of the corresponding shield tail grease chamber 3 decreases, that is, the volume of the shield tail grease chamber 3 decreases, the distance sensor 4 transmits the distance data to the controller 2. The controller 2 can use a PLC (Programmable Logic Controller) control device, and the controller 2 can calculate the volume change of the shield tail grease chamber 3 according to the reduction amount of the distance data, thereby reducing the grease filling amount of the shield tail grease chamber 3 according to the system grease filling rule.

[0029] At the same time, the controller 2 can also adjust the grease filling order of each shield tail grease chamber 3 based on the system grease filling rules according to the volume change of the shield tail grease chamber 3, so as to give priority to meeting the filling demand of the shield tail grease chamber 3 with increased volume, and realize fixed adaptive grease filling during excavation.

[0030] The system grease filling rules are determined by the performance of the shield machine and the specific construction needs to meet the functional requirements of mechanical parts lubrication, sealing, etc. during the construction process. The grease filling method still uses the shield machine's grease pump for pumping and filling, which will not be repeated here.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An adaptive shield tail grease injection system, comprising a grease injection pipeline (1), a shield tail (5) of a shield machine and a pipe segment (6); the pipe segment (6) is installed on the inner side of the shield tail (5) of the shield machine, and a plurality of shield tail grease chambers (3) are formed between the outer wall of the pipe segment (6) and the inner wall of the shield tail (5) of the shield machine; a plurality of grease injection pipelines (1) are arranged in the shield tail (5) of the shield machine, the oil inlets of the plurality of grease injection pipelines (1) are connected to a grease pump, and the oil outlets of the plurality of grease injection pipelines (1) are respectively connected to a plurality of shield tail grease chambers (3), so that grease is respectively injected into the plurality of shield tail grease chambers (3); Its characteristics are: A plurality of distance sensors (4) are arranged on the inner wall of the shield tail (5) of the shield machine, the plurality of distance sensors (4) are arranged facing the pipe segment (6), and the detection direction of the plurality of distance sensors (4) coincides with the radial direction of the pipe segment (6); a controller (2) is arranged inside the shield machine, the output ends of the plurality of distance sensors (4) are respectively electrically connected to the input ends of the controller (2), and the output end of the controller (2) is electrically connected to the shield machine control system; along the tunneling direction of the shield machine, each distance sensor (4) and at least one shield tail grease cavity (3) are located on the same straight line, and the distance data detected by each distance sensor (4) corresponds to the height change data of each shield tail grease cavity (3) on the same straight line with the distance sensor (4); during the tunneling process of the shield machine, the distance sensor (4) and the controller (2) are first used to judge the volume change of the shield tail grease cavity (3), and then grease is added.

2. The adaptive shield tail grease injection system according to claim 1 is characterized by: A gap is left between the distance sensor (4) and the outer wall of the pipe segment (6).

3. The adaptive shield tail grease injection system according to claim 1 is characterized by: Along the tunneling direction of the shield machine, the plurality of distance sensors (4) are located upstream of the shield tail grease chamber (3).

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