Precise grease injection device and method for shield tail of shield tunneling machine

Abstract

The invention discloses a shield tunneling machine shield tail grease accurate injection device and method, the shield tunneling machine shield tail grease accurate injection device comprises a piston cylinder, the piston cylinder comprises a cylinder body and a piston arranged in the cylinder body in a sliding mode, a suction space is formed between one side of the piston and the cylinder body, the cylinder body is provided with a suction hole and a discharge hole which are communicated with the suction space, and the suction hole is connected with an oil conveying pipe; the discharge hole is connected with a shield tail brush through an injection pipe; the suction hydraulic cylinder is connected to the other side of the piston; a discharge hydraulic cylinder connected to the other side of the piston; the suction hydraulic cylinder and the discharge hydraulic cylinder are respectively provided with the displacement sensors; and the controller is in signal connection with the suction hydraulic cylinder, the discharge hydraulic cylinder and the displacement sensor. The shield tail grease injection device solves the problems that existing shield tail grease is injected through a pneumatic high-pressure plunger pump, a pump body sealing piece of the pneumatic high-pressure plunger pump is prone to abrasion, and consequently the grease injection amount control accuracy is insufficient.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunneling construction, and particularly relates to a precise shield tail grease injection device and method for a shield machine. Background Art

[0002] As a core component of a shield machine, the shield tail grease system mainly functions to seal the shield tail area, preventing groundwater and soil from invading the tunneling chamber and effectively blocking the leakage of slurry and other substances to the surrounding strata during tunneling. At present, pneumatic high-pressure piston pumps are mostly used for shield tail grease injection pumps in shield machines. This pump uses compressed air to drive the piston to reciprocate, thereby achieving high-pressure delivery of high-viscosity grease.

[0003] The pneumatic high-pressure piston pump drives the piston to reciprocate through compressed air to achieve high-pressure delivery of high-viscosity grease. For example, pneumatic pumps of brands such as Ingersoll Rand and Graco (GRACO) can reach a working pressure of more than 150 bar, which is suitable for the continuous pumping requirements of shield machines.

[0004] However, due to the wear of the pump body seals of the pneumatic high-pressure piston pump, the injection volume in each stroke of the pneumatic high-pressure piston pump will gradually deviate, resulting in insufficient accuracy in controlling the injection volume. Summary of the Invention

[0005] In order to overcome the defects of the prior art, the present invention provides a precise shield tail grease injection device and method for a shield machine to solve the problem that the existing shield tail grease is injected by a pneumatic high-pressure piston pump, and the pump body seals of the pneumatic high-pressure piston pump are easily worn, resulting in insufficient accuracy in controlling the grease injection volume.

[0006] To achieve the above object, a precise shield tail grease injection device for a shield machine is provided, including:

[0007] A piston cylinder, including a cylinder body and a piston slidably disposed in the cylinder body. A suction space is formed between one side of the piston and the cylinder body. The cylinder body is provided with an inlet hole and an outlet hole communicating with the suction space. The inlet hole is connected to an oil delivery pipe, and the outlet hole is connected to a shield tail brush through an injection pipe;

[0008] An inhalation hydraulic cylinder for driving the piston to suck grease into the suction space, connected to the other side of the piston;

[0009] An exhaust hydraulic cylinder for reversely driving the piston to discharge the grease from the suction space, connected to the other side of the piston;

[0010] A displacement sensor for collecting the displacement value of the piston rod of the inhalation hydraulic cylinder or the exhaust hydraulic cylinder. Displacement sensors are respectively installed on the inhalation hydraulic cylinder and the exhaust hydraulic cylinder;

[0011] The controller is signal - connected to the suction hydraulic cylinder, the discharge hydraulic cylinder and the displacement sensor.

[0012] Furthermore, the suction hydraulic cylinder is a single - piston - rod hydraulic cylinder.

[0013] Furthermore, the discharge hydraulic cylinder is a single - piston - rod hydraulic cylinder.

[0014] Furthermore, the suction hydraulic cylinder and the discharge hydraulic cylinder respectively drive the piston rod through a hydraulic station, and the controller is signal - connected to the hydraulic station.

[0015] Furthermore, a proportional valve for controlling the extending speed of the piston rod is installed on the hydraulic station.

[0016] The present invention provides a shield tail grease injection method for a shield tail grease precise injection device of a shield machine, including the following steps:

[0017] Connect the oil delivery pipe on the suction hole of the piston cylinder to an oil - grease barrel, and connect the discharge hole of the piston cylinder to the shield tail brush through an injection pipe;

[0018] The controller controls the piston rod of the suction hydraulic cylinder to contract, and at the same time, the piston rod of the discharge hydraulic cylinder contracts passively, so that the grease in the oil - grease barrel is sucked into the suction space in the piston cylinder through the oil delivery pipe. At the same time, the displacement sensor on the suction hydraulic cylinder collects the first displacement value of the piston cylinder of the suction hydraulic cylinder, and the controller calculates the amount of grease in the suction space based on the first displacement value;

[0019] The controller calculates the second displacement value of the piston cylinder of the discharge hydraulic cylinder based on the grease injection amount of the shield tail brush;

[0020] Based on the second displacement value, the controller controls the piston rod of the discharge hydraulic cylinder to extend, and at the same time, the piston rod of the suction hydraulic cylinder extends passively. When the real - time displacement value collected by the displacement sensor on the discharge hydraulic cylinder is adapted to the second displacement value, the discharge hydraulic cylinder is closed, so that the grease in the suction space is precisely injected into the shield tail brush through the discharge hole.

[0021] The beneficial effects of the present invention are as follows: There are a total of two hydraulic cylinders connecting the piston of the piston cylinder in the shield tail grease precise injection device of the present invention. The hydraulic cylinders are driven by a hydraulic station. One hydraulic cylinder drives the piston to suck the shield tail grease into the piston cylinder, and the other hydraulic cylinder drives the piston to inject the grease in the piston cylinder into the shield tail brush. The two hydraulic cylinders cycle to achieve uninterrupted injection of shield tail grease. The grease injection accuracy of the shield tail grease precise injection device of the present invention is high, and the controller obtains the displacement value of the displacement sensor on the hydraulic cylinder to achieve precise shield tail grease injection. Description of the Drawings

[0022] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments read in conjunction with the accompanying drawings:

[0023] Figure 1 It is a schematic structural diagram of the precise injection device for shield tail grease of the shield machine according to the embodiment of the present invention.

[0024] Figure 2 It is a schematic diagram of the pipeline connection of the precise injection device for shield tail grease of the shield machine according to the embodiment of the present invention. Detailed implementation manners

[0025] The following further elaborates the present application in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention and are not intended to limit the invention. Additionally, it should be noted that for ease of description, only parts related to the invention are shown in the drawings.

[0026] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will detail the present application with reference to the drawings and in conjunction with the embodiments.

[0027] Referring to Figure 1 and Figure 2 As shown, the present invention provides a precise injection device for shield tail grease of a shield machine, including: a piston cylinder 1, a suction hydraulic cylinder 2, a discharge hydraulic cylinder 3, a displacement sensor 4, and a controller.

[0028] The piston cylinder 1 includes a cylinder block 11 and a piston 12. The piston 12 slides in the cylinder block 11. A suction space a is formed between one side of the piston and the cylinder block. The cylinder block is provided with a suction hole and a discharge hole communicating with the suction space a. The suction hole is connected with an oil delivery pipe. The discharge hole is connected with a shield tail brush 6 through an injection pipe.

[0029] In this embodiment, the piston cylinder belongs to the prior art, and its specific structure will not be elaborated herein.

[0030] The suction hydraulic cylinder 2 is connected to the other side of the piston 12. The suction hydraulic cylinder 2 is used to drive the piston 12 to suck grease into the suction space a.

[0031] As a preferred embodiment, the suction hydraulic cylinder 2 is a single-rod hydraulic cylinder.

[0032] The discharge hydraulic cylinder 3 is connected to the other side of the piston 12. The discharge hydraulic cylinder 3 is used to reversely drive the piston 2 to discharge the grease from the suction space a.

[0033] As a preferred embodiment, the discharge hydraulic cylinder 3 is a single-rod hydraulic cylinder.

[0034] In this embodiment, when the piston moves forward or backward, one of the suction hydraulic cylinder 2 and the discharge hydraulic cylinder 3 drives the piston, and the other is driven. The two hydraulic cylinders drive the piston to move forward and backward.

[0035] Displacement sensors are respectively installed on the suction hydraulic cylinder 2 and the discharge hydraulic cylinder 3. The displacement sensor 4 is used to collect the displacement value of the piston rod of the suction hydraulic cylinder 2 or the discharge hydraulic cylinder 3.

[0036] The controller is signal-connected to the suction hydraulic cylinder 2, the discharge hydraulic cylinder 3 and the displacement sensor.

[0037] In this embodiment, the controller is a PLC in the control cabinet. The controller obtains the displacement value collected by the displacement sensor and controls the coordinated action of the suction hydraulic cylinder and the discharge hydraulic cylinder to achieve precise tail seal grease injection.

[0038] There are a total of two hydraulic cylinders connected to the piston of the piston cylinder of the tail seal grease precise injection device of the present invention. The hydraulic cylinders are driven by a hydraulic station. One hydraulic cylinder drives the piston to suck the tail seal grease into the piston cylinder, and the other hydraulic cylinder drives the piston to inject the grease in the piston cylinder into the tail seal brush. The two hydraulic cylinders cycle to achieve continuous injection of tail seal grease.

[0039] Each hydraulic cylinder is equipped with a displacement sensor, and the grease injection amount and injection speed can be accurately obtained through the displacement length of the piston rod of the hydraulic cylinder.

[0040] As a preferred embodiment, the suction hydraulic cylinder 2 and the discharge hydraulic cylinder 3 respectively drive the piston rod through a hydraulic station. The controller is signal-connected to the hydraulic station.

[0041] The hydraulic station is equipped with a proportional valve for controlling the extension speed of the piston rod, which can achieve a grease injection speed control of 0 to 2 liters per minute.

[0042] The present invention provides a method for injecting tail seal grease of a tail seal grease precise injection device of a shield machine, including the following steps:

[0043] S1. Connect the oil pipeline on the suction hole of the piston cylinder 1 to the grease bucket 5, and connect the discharge hole of the piston cylinder 1 to the tail seal brush 6 through the injection pipe.

[0044] S2. The controller controls the piston rod 21 of the suction hydraulic cylinder 2 to contract, and at the same time, the piston rod 31 of the discharge hydraulic cylinder 3 is driven to contract, so that the grease in the grease bucket 5 is sucked into the suction space a in the piston cylinder 1 through the oil pipeline. At the same time, the displacement sensor on the suction hydraulic cylinder 2 collects the first displacement value of the piston cylinder 1 of the suction hydraulic cylinder 2, and the controller calculates and obtains the grease amount in the suction space based on the first displacement value.

[0045] S3. The controller calculates and obtains a second displacement value of the piston cylinder 1 of the discharge hydraulic cylinder 3 based on the grease injection amount of the tail seal brush 6.

[0046] S4. Based on the second displacement value, the controller controls the piston rod 31 of the discharge hydraulic cylinder 3 to extend, and at the same time, the piston rod 21 of the suction hydraulic cylinder 2 extends passively. When the real-time displacement value collected by the displacement sensor on the discharge hydraulic cylinder 3 is adapted to the second displacement value, the discharge hydraulic cylinder 3 is closed, so that the grease in the suction space a is accurately injected into the tail seal brush 6 through the discharge hole.

[0047] The grease injection accuracy of the tail seal grease precise injection device of the shield machine of the present invention is high, and the controller obtains the displacement value of the displacement sensor on the hydraulic cylinder to perform precise tail seal grease injection.

[0048] The tail seal grease precise injection device of the shield machine of the present invention has strong adaptability. The grease pipeline valves of the tail seal grease precise injection device of the present invention all adopt high-pressure resistant types and can work stably in high-viscosity and high-pressure environments.

[0049] The grease injection speed of the tail seal grease precise injection device of the present invention is adjustable, and the adjustment range of the grease injection speed of the precise injection device is large, meeting the grease injection speed in the tail seal brush during the propulsion of the shield machine.

[0050] The tail seal grease precise injection device of the shield machine of the present invention has high reliability, a strong structure, can adapt to the harsh working environment of the shield machine, and reduces maintenance and downtime.

[0051] The grease pipeline valves of the precise injection device all adopt high-pressure resistant types and can withstand a maximum pressure of 350 Bar.

[0052] The adjustment range of the tail seal grease injection speed of the tail seal grease precise injection device of the present invention is 0 - 2 liters per minute, and the grease injection speed is automatically controlled according to the propulsion speed of the shield machine.

[0053] The grease injection amount of the tail seal grease precise injection device of the shield machine of the present invention is accurately controlled, and the injection amount error is ±1%.

[0054] The above description is only the preferred embodiment of the present application and the description of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A shield tail grease precision injection device for a shield machine, characterized in that: include: A piston cylinder comprises a cylinder body and a piston slidably arranged in the cylinder body, a suction space is formed between one side of the piston and the cylinder body, the cylinder body is provided with a suction hole and a discharge hole connected to the suction space, the suction hole is connected to an oil delivery pipe, and the discharge hole is connected to a shield tail brush through an injection pipe; A suction hydraulic cylinder for driving the piston to allow the suction space to suck grease, connected to the other side of the piston; A discharge hydraulic cylinder for reversely driving the piston to discharge the grease from the suction space, connected to the other side of the piston; A displacement sensor for collecting the displacement value of the piston rod of the suction hydraulic cylinder or the discharge hydraulic cylinder, wherein the suction hydraulic cylinder and the discharge hydraulic cylinder are respectively equipped with a displacement sensor; A controller is signal-connected to the suction hydraulic cylinder, the discharge hydraulic cylinder and the displacement sensor.

2. The shield tail grease precision injection device of the shield machine according to claim 1 is characterized in that: The suction hydraulic cylinder is a single-piston-rod hydraulic cylinder.

3. The shield tail grease precise injection device of the shield machine according to claim 1 is characterized in that: The discharge hydraulic cylinder is a single-piston-rod hydraulic cylinder.

4. The shield tail grease precise injection device of the shield machine according to claim 1 is characterized in that: The suction hydraulic cylinder and the discharge hydraulic cylinder drive the piston rods respectively through a hydraulic station, and the controller signal is connected to the hydraulic station.

5. The shield tail grease precise injection device of the shield machine according to claim 4 is characterized in that: The hydraulic station is equipped with a proportional valve for controlling the extension speed of the piston rod.

6. A method for injecting grease into the tail of a shield machine using the device for accurately injecting grease into the tail of a shield machine as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Connect the oil delivery pipe on the suction hole of the piston cylinder to the grease barrel, and connect the discharge hole of the piston cylinder to the shield tail brush through the injection pipe; The controller controls the piston rod of the suction hydraulic cylinder to contract, and the piston rod of the discharge hydraulic cylinder is driven to contract, so that the grease in the grease barrel is sucked into the suction space in the piston cylinder through the oil pipeline. At the same time, the displacement sensor on the suction hydraulic cylinder collects the first displacement value of the piston cylinder of the suction hydraulic cylinder, and the controller calculates and obtains the amount of grease in the suction space based on the first displacement value; The controller calculates and obtains a second displacement value of the piston cylinder of the discharge hydraulic cylinder based on the grease injection amount of the shield tail brush; Based on the second displacement value, the controller controls the piston rod of the discharge hydraulic cylinder to extend, and at the same time, the piston rod of the suction hydraulic cylinder is driven to extend. When the real-time displacement value collected by the displacement sensor on the discharge hydraulic cylinder matches the second displacement value, the discharge hydraulic cylinder is closed, so that the grease in the suction space is accurately injected into the shield tail brush through the discharge hole.

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